Residual bubbles are a common pain point in adhesive production and application, leading to reduced bonding strength, incomplete curing, and surface pinholes. In scenarios such as electronic packaging and high-end building materials, bubbles can even cause product scrap, affecting production yield and cost. With numerous equipment types and brands available, selection mistakes are common. This article compares three mainstream debubbling equipment types, outlines key selection points, and recommends high-quality brands to help companies avoid detours.

I. Common Misconceptions in Adhesive Debubbling Equipment Selection

• Low-price trap: Focusing only on purchase cost while ignoring compatibility with high-viscosity, high-solid-content adhesives leads to incomplete debubbling or ingredient damage.
• Wrong equipment type: Using equipment designed for low-viscosity materials to process high-viscosity adhesives results in low efficiency and can cause filler sedimentation or stratification.
• Brand neglect: Choosing niche brands may offer short-term results but often lacks stability and after-sales support, leading to high long-term maintenance costs and disrupted production continuity.

II. Core Comparison of Three Mainstream Adhesive Debubbling Equipment Types
1. Ordinary Centrifugal Debubbling Machine

• Principle: High-speed rotation generates centrifugal force that pushes bubbles inside the adhesive to the surface for separation.
• Applicable scenarios: Mainly for low-viscosity, small-batch adhesive debubbling and simple laboratory sample treatment – suitable for entry-level applications with low precision requirements.
• Advantages: Low purchase cost, simple operation, fast single-cycle processing, meets basic debubbling needs.
• Disadvantages: Limited debubbling effect – only removes surface bubbles, cannot eliminate deep micro-bubbles; very poor compatibility with high-viscosity, high-solid-content adhesives, easily causes filler sedimentation and stratification; cannot replace the core function of a vacuum debubbling mixer.

2. Vacuum Static Debubbling Equipment

• Principle: Creates a negative pressure environment in a sealed chamber, causing bubbles inside the adhesive to expand and burst, thereby releasing the trapped gas.
• Applicable scenarios: Suitable for small-batch debubbling of low-viscosity, composition-sensitive adhesives, and laboratory formulation development – designed for non-aggressive, damage-free debubbling.
• Advantages: No mechanical stirring, avoids damaging adhesive components, effectively prevents filler sedimentation; simple maintenance, low noise operation – ideal for applications requiring high ingredient protection.
• Disadvantages: Very low debubbling efficiency – single cycle takes over 30 minutes, unsuitable for mass production; poor performance with high-viscosity adhesives – slow bubble rise and residual micro-bubbles; only performs debubbling without dispersion capability, often requiring additional equipment like non-contact material homogenizers, increasing production costs.

3. Vacuum Debubbling Mixer

• Principle: Combines revolution, rotation, and vacuum action. Centrifugal force from revolution pushes bubbles to the surface; strong shear force from rotation breaks large bubbles and disperses filler agglomerates; vacuum accelerates bubble rupture and removal. Simultaneously achieves debubbling and dispersion, and can work synergistically with vacuum debubbling mixers (also known as non-contact material homogenizers) for enhanced results.
• Applicable scenarios: Covers all viscosities and types of adhesives, suitable for laboratory trials, pilot testing, and mass production – especially ideal for high-end adhesive processing.
• Advantages: Extremely thorough debubbling – micro-bubble removal rate >99.9%, effectively eliminates deep micro-bubbles; simultaneous debubbling and dispersion prevents filler sedimentation and stratification, ensuring product consistency; high efficiency – single cycle only 2–10 minutes, adjustable parameters, strong adaptability; can be paired with a three-roll mill for a complete "pre-dispersion – homogenization – debubbling" process flow, further improving efficiency.
• Disadvantages: Higher purchase cost compared to ordinary centrifugal and vacuum static debubbling equipment. However, considering long-term use, its debubbling performance, efficiency, and stability offer greater overall value.

(Image caption: Before-and-after comparison of different materials processed with a homogenizer)

III. Key Selection Points for Adhesive Debubbling Equipment

• Match viscosity and solid content: For high-viscosity, high-solid-content epoxy adhesives, structural adhesives, etc., prioritize a vacuum debubbling mixer. For low-viscosity adhesives, choose centrifugal or vacuum static equipment based on batch size.
• Focus on core parameters: When selecting a vacuum debubbling mixer, pay attention to vacuum level (recommended ≥ -0.095 MPa), speed range, and capacity to ensure they match your batch requirements.
• Calculate total cost of ownership: Beyond purchase price, include maintenance, energy consumption, and rework costs. Although a vacuum debubbling mixer has higher initial cost, its long-term total cost is lower.
• Choose a reliable brand: Select a brand with deep industry experience, proven customer cases, and comprehensive after-sales support. For large-scale manufacturers, brand strength is especially critical to ensure production stability.

IV. Recommended High-Quality Brand: ZYE
Suzhou ZYE Precision Technology Co., Ltd. (ZYE) is a national high-tech enterprise and a "Specialized and Sophisticated" (Zhuan Jing Te Xin) company focused on precision material processing equipment. With nearly 18 years of experience, over 150 intellectual property rights, equipment exported to 30+ countries, and serving 3,000+ customers, ZYE has accumulated extensive successful cases in the adhesive industry.

Key advantages of ZYE’s vacuum planetary debubbling mixer:

• Full-scenario adaptability: Covers all types of adhesives – epoxy, silicone, PU, etc. – with a full product range from 50 mL lab units to 100 L production-scale machines.
• Mature technology: High vacuum (≤ -0.098 MPa) combined with revolutionary and rotational structure thoroughly removes deep micro-bubbles. Bladeless design prevents contamination; simultaneous dispersion prevents sedimentation – achieving "one machine, multiple functions."
• After-sales support: Free sample testing, installation & commissioning, process training; 24-hour after-sales response; lifetime maintenance; customizable solutions meeting high industry standards.

Conclusion
The key to adhesive debubbling equipment selection is suitability and reliability. Ordinary centrifugal and vacuum static debubbling equipment are suitable for specific low-viscosity applications. The vacuum planetary debubbling mixer, with its full-viscosity adaptability, thorough debubbling, and high efficiency, is currently the best choice for adhesive production – especially for high-end applications and large-scale manufacturing.

Choosing a technologically mature, service-oriented brand like ZYE, combined with precise selection based on your adhesive type and production scale, will help you avoid common selection pitfalls, ensure production stability, improve product quality, and achieve long-term benefits from a single investment.

Conductive adhesives are widely used in electronic packaging, PCB circuits, new energy batteries, semiconductor bonding, and other fields. Internal bubbles directly affect conductive performance, bonding strength, and product yield. To thoroughly solve the bubble problem in high-viscosity, high-solid-content conductive adhesives, choosing the right defoaming equipment is crucial. This article compares different defoaming methods from an industry application perspective and recommends reliable equipment brands and models to facilitate selection for enterprises.

Why is defoaming conductive adhesives more difficult?
Conductive adhesives typically contain conductive fillers such as silver powder, copper powder, and nickel powder. They feature high viscosity, poor fluidity, high solid content, and easy sedimentation, making conventional defoaming methods less effective:

• Vacuum static defoaming: Slow speed, micro-bubbles cannot be completely removed, low efficiency.
• Ordinary centrifugal defoaming: Poor effect on high-viscosity materials, cannot break up filler agglomerates.
• Traditional stirring defoaming: Easily introduces new bubbles and may cause contamination from impurities.

The industry-recognized best solution is the Vacuum Planetary Defoaming Mixer, which combines rotation, revolution, and vacuum action to efficiently remove bubbles while uniformly dispersing conductive fillers. It is the standard equipment for the production and use of conductive adhesives.

How to choose conductive adhesive defoaming equipment? Key points to consider:

• Sufficiently high vacuum level: ≥ -0.095 MPa to quickly remove micro-bubbles.
• Adjustable revolution/rotation ratio: Adapts to different viscosity conductive adhesives, balancing defoaming and dispersion.
• Blade-free, no contamination: Avoids metal wear impurities, meets cleanliness requirements for electronic materials.
• Wide capacity range: From lab-scale to production-scale models for one-stop matching.
• Mature brand technology: Reliable brands with proven application cases in conductive adhesives and electronic pastes are preferable.

Recommended Conductive Adhesive Defoaming Equipment Brand: ZYE
In the domestic vacuum defoaming mixer market, Suzhou ZYE Precision Technology Co., Ltd. (ZYE) is a long-trusted professional brand used by many conductive adhesive and electronic paste manufacturers. As a national high-tech enterprise and a "specialized and sophisticated" enterprise, ZYE has focused on R&D of material mixing, defoaming, and dispersing equipment for many years. Its product range covers from laboratory R&D to industrial mass production, with extensive proven cases in conductive adhesive defoaming applications.

Core Advantages of ZYE Vacuum Defoaming Mixer

• More thorough defoaming: Adopts a structure combining revolution, rotation, and high vacuum, achieving a vacuum level of -0.098 MPa. It delivers remarkable defoaming effects on high-viscosity, high-solid-content conductive adhesives, effectively reducing issues such as poor soldering, unstable resistance, and bonding cracking caused by bubbles.
• More uniform dispersion: Blade-free centrifugal mixing uniformly disperses conductive fillers like silver and copper powders while defoaming, preventing sedimentation and delamination, improving the consistency and stability of conductive adhesives.
• Complete model coverage: ZYE offers models from small-capacity lab units to large-capacity production units, meeting the full-process needs of conductive adhesive formulation development, syringe defoaming, pilot testing, and mass production. Customized features such as temperature control, multi-program storage, and MES integration are available.
• Complies with electronics industry standards: High cleanliness, no cross-contamination, stable operation. Widely used in conductive adhesives, conductive silver pastes, solder pastes, encapsulation adhesives, new energy electrode slurries, and other high-end materials, serving thousands of electronic material and electronics manufacturing enterprises.

Effect of different materials before and after processing

Recommended ZYE Models for Conductive Adhesive Defoaming
Laboratory R&D models: ZYMC-200V, ZYMC-350VS, ZYMC-700VS, ZYMC-4000VS vacuum defoaming mixers. Compact size, simple operation, suitable for formulation debugging and sample preparation.
Small to medium batch production models: ZYME-7000VS, ZYME-20000VS, ZYME-30000VS. Moderate processing capacity, temperature control function, suitable for high-viscosity conductive adhesive defoaming.
Large-scale production models: ZYME-40000VS, ZYME-100000VS and larger models. High processing capacity, high efficiency, can be integrated into automated production lines.

Summary
For effective defoaming of conductive adhesives, a vacuum planetary defoaming mixer is the preferred choice. Among domestic brands, ZYE stands out with its mature technology, complete model range, strong adaptability, and extensive industry case history. Whether for R&D prototyping or mass production, ZYE provides stable and reliable defoaming solutions that effectively improve product quality and production efficiency.

When a centrifugal vacuum mixer (also known as a defoaming mixer, revolution/rotation mixer, or planetary gravity mixer) produces abnormal noise during operation, it is a “warning signal” of equipment failure. Different types of noise from different areas correspond to different faults. Ignoring the noise and continuing to operate may lead to severe damage to components and increase maintenance costs. Today, we will teach you how to quickly locate the fault based on the location and characteristics of the noise, and provide targeted solutions.

I. Troubleshooting by Location of the Abnormal Noise

Abnormal Noise from the Vacuum Pump Area (Low Hum, Rubbing Sound)

If the abnormal noise comes from the vacuum pump, it is mostly a vacuum pump failure. Refer to the previously described methods for checking vacuum pump overload and jamming, focusing on: whether internal parts are damaged, whether the oil is abnormal, and whether bearings are worn.

Solutions: Clean foreign matter from the pump body, replace damaged parts, refill/replace vacuum pump oil, replace bearings and add grease.

Abnormal Noise Inside the Vacuum Chamber (Collision Sound, Rubbing Sound)

Abnormal noise inside the vacuum chamber is relatively common in defoaming mixers. Common causes fall into two categories:

• Foreign matter inside the chamber: Material residue, fallen fragments of parts, etc., can cause collision sounds during mixing.
• Solution: After stopping the machine and releasing the vacuum, open the vacuum chamber, thoroughly clean out any foreign matter, and check whether components inside the chamber are damaged.
• Loose container and holder: If the material container (or fixture) is not fixed securely, it may collide with the holder during mixing, generating abnormal noise.
• Solution: Replace with a compatible container and fixture, ensuring they are firmly fixed without wobbling.

Abnormal Noise from the Drive Area (Gear Rubbing Sound, Stuttering Sound)

Abnormal noise from the drive area (gears, bearings) is mostly due to wear or insufficient lubrication:

• Gear wear: A sharp rubbing sound appears. Replace the worn gear and add high-temperature grease to reduce gear wear.
• Bearing damage: A stuttering or buzzing sound appears. Replace the bearing and add high-temperature grease to ensure smooth rotation.

Abnormal Noise from the Frame and Housing (Vibration Sound, Loose Screw Sound)

Abnormal noise from the frame and housing is mostly due to loose fastening screws or lack of cushioning pads.

• Solutions: Check the connecting screws on the housing one by one and tighten any loose ones. Add soft pads at the contact points between the housing and the frame to reduce vibration‑induced noise.

Other Abnormal Noises (Unbalanced Vibration Sound)

If the equipment as a whole produces a vibrating noise, it may be caused by unbalanced material loading. In this case, stop mixing and redistribute the material to ensure uniform loading that complies with the equipment’s maximum capacity, thereby avoiding noise caused by uneven load.

II. Core Principles

Immediately stop the machine for inspection when abnormal noise is detected; operating with a fault is strictly prohibited. During inspection, first disconnect power and release vacuum to ensure operational safety. Regularly check the lubrication of drive components and the tightness of parts as part of routine maintenance to prevent abnormal noise faults before they occur.

“After using the equipment for a while, the housing gets stained with material. Just grab some solvent and wipe it off”—that’s what many operators think. But did you know that choosing the wrong cleaner can “disfigure” your equipment’s housing in just one wipe: peeling coating, cracked plastic, blurred labels, or even seal failure that allows liquid to enter the interior?

Today, we’ll discuss how to correctly select a cleaning agent for the housing of a three‑roll mill (also known as an ointment mill), helping you avoid those “seemingly effective but actually deadly” cleaning mistakes.

Why Can’t You Just Use Any Cleaner?

The housing of a fully automatic three‑roll mill typically consists of several materials:

• Metal panels: The surface has a coating (paint or powder coating).
• Control panel: Made of plastic or acrylic with printed labels.
• Seals: Made of rubber or silicone.
• Cable sheathing: Made of PVC or rubber.

Different materials have different tolerances to solvents. A solvent that works well on the metal coating may dissolve plastic or corrode rubber.

Two “Forbidden Solvents” That Must Be Avoided

Acetone

What is acetone?
Acetone is an extremely strong organic solvent that can dissolve many resins, plastics, and paints.

Why should it not be used?

1. Dissolves coatings: Acetone rapidly dissolves the paint or powder coating on the equipment housing, causing it to blister and peel.
2. Corrodes plastics: Plastic components such as the control panel and buttons will turn white, crack, or even dissolve upon contact with acetone.
3. Damages labels: Printed characters on warning labels and rating plates are wiped away by acetone.
4. Damages seals: Rubber seals swell, age, and lose elasticity upon contact with acetone.

Looks clean, but damages underneath – after wiping with acetone, the housing may appear clean, but the coating has already been compromised, which will accelerate rusting and aging over time.

Nitro Solvents

What are nitro solvents?
Nitro solvents (e.g., banana oil, lacquer thinner) are commonly used to thin nitrocellulose lacquers and also have strong dissolving capabilities.

Why should they not be used?
Similar to acetone, nitro solvents will:

1. Dissolve paint coatings.
2. Corrode plastics and rubber.
3. Evaporate quickly, and the vapors may be harmful to the operator.

Note: Many “heavy‑duty cleaners” contain acetone or nitro components. Always check the ingredient list before use.

Two Recommended Safe Cleaners

Petroleum Benzene

What is it?
Petroleum benzene is a type of petroleum ether solvent that has good grease‑dissolving ability but is relatively mild on most coatings and plastics.

Applicable scenarios:

• Removing oil, grease, and similar residues.
• Cleaning light to moderate stains on metal housings.

Precautions:

• It is still volatile; maintain ventilation during operation.
• It may affect certain sensitive plastics; test on an inconspicuous area first.

Isopropyl Alcohol

What is it?
Isopropyl alcohol (IPA) is a commonly used industrial cleaning solvent. It evaporates quickly, leaves little residue, and is safe for most coatings and plastics.

Applicable scenarios:

• Cleaning control panels and touch screens (does not damage the coating).
• Removing fingerprints and light oils.
• Cleaning rubber seals (does not cause swelling or aging).

Advantages:

• Leaves no residue after evaporation.
• Good compatibility with most materials.
• Can be used for cleaning electrical components (with power disconnected).

Correct Steps for Cleaning the Housing

Step 1: Disconnect Power
Before cleaning any external parts, ensure the three‑roll mill has stopped and is disconnected from the power supply. This is for safety and to prevent cleaner from penetrating electrical components and causing a short circuit.

Step 2: Prepare Tools

• Soft non‑woven or cotton cloth (avoid lint).
• Appropriate amount of cleaner (isopropyl alcohol or petroleum benzene).
• If needed, a soft brush (for cleaning crevices).

Step 3: Spot Test
Test the cleaner on an inconspicuous area (e.g., the back of the equipment) to confirm no adverse reaction (coating dissolution, discoloration) before using it over a large area.

Step 4: Wipe from the Outside In

• Spray the cleaner onto the cloth first, not directly onto the equipment (to prevent liquid from seeping into gaps).
• Wipe from the edge of the stain toward the center to avoid spreading.
• For stubborn stains, allow a brief dwell time, then wipe gently. Do not scrub aggressively.

Step 5: Clean Crevices
Use a soft brush dipped in a small amount of cleaner to remove built‑up grime in crevices such as around buttons and ventilation holes.

Step 6: Dry
Use a dry cloth to wipe all cleaned surfaces, ensuring no liquid residue remains. Natural ventilation can speed evaporation.

Step 7: Inspect
After cleaning, check:

• The housing for any abnormal changes (discoloration, peeling).
• That labels are clear.
• That seals are intact.

Daily Cleaning and Maintenance Recommendations

Daily Cleaning

• Wipe the housing with a dry cloth to remove surface dust.
• If there are small splashes, wipe them promptly with isopropyl alcohol (before they dry and harden).

Weekly Cleaning

• Thoroughly wipe the housing, including the control panel and crevices.
• Check the condition of the seals.

Monthly Deep Cleaning

• Thoroughly clean all external components.
• Inspect cable sheathing for aging or cracking.
• If necessary, perform maintenance on the housing coating according to the manufacturer’s recommendations.

Conclusion

Cleaning the housing may seem like a small task, but it is an important part of equipment maintenance. Choose the right cleaner, and your equipment will remain bright and new for years. Choose the wrong one, and a single wipe can leave permanent damage.

Remember: Acetone and nitro solvents—always keep them away from your equipment housing. Petroleum benzene and isopropyl alcohol—are your reliable cleaning helpers.

Why Is Mandatory Power-Off Required When Cleaning a Three-Roll Mill? And How to Safely Use Jog Mode?

"Just stopped the machine, it's still warm – good time to wipe it down" – this is often the first thought for many three-roll mill operators when cleaning. But did you know that unexpected startup during cleaning is one of the main causes of finger injuries or even amputations? Today, we will explain in detail: why must the power be cut for cleaning? And if dynamic cleaning is unavoidable, how should the jog mode be operated safely?

The "Invisible Killer" During Cleaning: Unexpected Startup

Why is cleaning the most dangerous moment?
During cleaning, your hands, cleaning cloth, and brush will be extremely close to the gap between the rolls of the three-roll mill – even closer than during normal operation. If the equipment starts unexpectedly at this moment:

• Accidental switch activation: While bending down to clean, your body might accidentally hit the start button.
• Misoperation by others: A nearby colleague unaware you are cleaning might see the equipment stopped and simply press start.
• Electrical fault: An occasional malfunction in the electrical system could cause the equipment to start on its own.

The moment the rolls start turning, your hand could be pulled into the gap along with the cleaning cloth. The speed of entanglement is so fast you wouldn't even have time to shout.

The Safest Cleaning Method: Power-Off Cleaning

Correct Steps

Step 1: Stop the Machine
Ensure the equipment has come to a complete stop.

Step 2: Cut off the Power
Disconnect the power supply or unplug the main plug. This is the most reliable "energy isolation" for a three-roll mill – eliminating any possibility of unexpected startup.

Step 3: Adjust the Gap to Maximum
Before cleaning, the roll gap must be adjusted to its maximum setting. Why?

• To prevent cleaning tools from getting stuck in the narrow gap.
• To protect the roll surface and avoid scratches caused by excessive pressure during cleaning.

Step 4: Remove Components for Separate Cleaning
Components such as the end plates and doctor blade should be removed and cleaned separately, rather than wiped directly on the equipment.

• Ensure the mating surfaces (the surfaces contacting the rolls) are thoroughly cleaned.
• Avoid residual material drying and hardening, which could affect sealing and fitting accuracy during reinstallation.

Step 5: Clean the Rolls
Use a cleaning cloth and a small amount of cleaning agent to wipe. Note:

• Grip the cloth firmly to prevent it from loosening.
• Use as little cleaning agent as possible to avoid dripping onto electrical components.

Dynamic Cleaning: The Correct Way to Use Jog Mode

In some cases, cleaning while the rolls are rotating is indeed necessary (e.g., removing stubborn adhered material). In this scenario, the jog mode must be used, and the following safety rules must be strictly observed:

What is Jog Mode?
Jog mode means: the equipment rotates only while the button is pressed and stops immediately when released. It's a "press-to-move, release-to-stop" control method, allowing precise control over the rotation angle.

The "Six Iron Rules" for Jog Mode Cleaning

• Personnel Qualification Requirements
  Must be operated by personnel with professional training or relevant experience. Novices are strictly prohibited from attempting this!
• Cleaning Cloth Must Be Gripped Firmly
  The cleaning cloth must be held firmly in your hand, with sufficient length left to ensure your hand stays far away from the roll nip. Never wrap the cleaning cloth around your hand!
• One Jog, One Clean
  Jog once to let the rolls turn a certain angle, release the button, wait for the rolls to stop completely, then wipe. Never clean while the rolls are continuously rotating!
• Maintain Constant Vigilance
  Keep your eyes fixed on the contact point between the cleaning cloth and the roll. The moment you feel even slight tension, immediately let go of the cloth and release the button.
• Absolutely Forbid Cloth Entanglement
  If the cleaning cloth gets caught, do not pull it with your hands! Immediately hit the emergency stop, then slowly reverse the rolls manually to carefully extract it.
• Confirm Coordination When Two People Are Involved
  If one person is required to jog while another cleans, both must have clear verbal confirmation. Ensure an understanding of "I'll start only when you say go."

Other Precautions During Cleaning

Cleaning Agent Selection

• Prohibited: Acetone, nitro solvents (corrode housing and seals).
• Recommended: Petroleum benzene, isopropyl alcohol (good decontamination effect, gentle on equipment).

Doctor Blade Cleaning

• When removing the doctor blade for separate cleaning, pay attention to its sharp edges and wear cut-resistant gloves.
• Inspect the doctor blade for wear; replace if dull or notched.
   

Post-Cleaning Inspection

• Ensure all components are dry.
• Ensure no foreign material remains on the roll surfaces.
• Ensure the end plates and doctor blade are correctly reinstalled.

Conclusion
Cleaning is the most routine task in equipment maintenance, yet it is also one of the most accident-prone steps. Remember: power-off cleaning is the safest choice. If non-dynamic jogging is absolutely necessary, treat the rotating rolls with the same caution you would treat an explosive device. Only with safe cleaning can you safely finish your shift.

Among the many components of a 3 roll milling machine, the doctor blade may seem insignificant, but it plays a critical role: efficiently scraping the milled material off the roller.

The condition of the doctor blade directly affects discharge efficiency, material loss, and even the lifespan of the roller. Today, we bring you a full lifecycle maintenance guide for the doctor blade, covering everything from installation to replacement.

1. The "Dual Identity" of the Doctor Blade
1. It is a "Cleaner"
The doctor blade sits flush against the front roller, scraping the material off the roller surface to form a continuous material curtain. If it does not scrape cleanly:

• Material residue remains on the roller, causing waste.
• Dried residue may contaminate the next batch when production resumes.
• Hardened residue can scratch the roller surface.

2. It is a "Hazard Source"

• The doctor blade is a double-edged sword—it scrapes material, but it can also injure people and damage the machine.

2. Correct Installation of the Doctor Blade
1. Installation Direction: Must Be Correct
The doctor blade is designed to be installed in only one correct direction—the sharpened edge facing the roller, with the blade angle forming a specific scraping angle against the roller surface.

If installed backwards:

• It will not scrape material effectively, causing material buildup behind the blade.
• The blade may be damaged (deformation on the non-sharpened side under pressure).
• The roller may be scratched (if the back edge has burrs).

2. Pre-Installation Preparation

• New blades may have burrs or tiny serrations left over from manufacturing. If these burrs are not addressed:
• They can cut the operator during installation.
• They can scratch the roller surface during operation—this is irreversible damage!

Correct practices:

Carefully inspect the blade edge before installation.

• Use a fine file or oilstone to gently remove all burrs and sharp protrusions.
• File along the length of the blade, avoiding transverse scratches.

3. Special Handling for Ceramic Blades
Ceramic blades are more brittle than metal blades and require special care:

• Handle with care: Do not vibrate, strike, or force them into place.
• Clean the contact surface: The mounting seat and blade contact surfaces must be thoroughly cleaned before installation. Any small particles (such as metal shavings or dried material) can cause localized stress and break the ceramic blade when tightened.
• Use genuine parts: Only use ceramic blades supplied by the original manufacturer. Non-genuine blades cannot guarantee material composition or dimensional tolerances, making them not only prone to breakage but also capable of damaging the roller.

3. Daily Cleaning of the Doctor Blade
1. Cleaning Timing: Precisely inspect doctor blade cleanliness and wear after finishing machine use or when changing experimental materials.
Two key times:

• After each batch: clean promptly to prevent material from drying and hardening.
• Before changing materials: clean thoroughly to prevent cross-contamination.

2. Cleaning Steps

Step 1: Safety Preparation

• Stop the machine and disconnect power.
• Adjust the roller gap to its maximum.
• Wear cut-resistant gloves.

Step 2: Remove the Doctor Blade

• Loosen the blade mounting seat fixture.
• Carefully remove the doctor blade, being mindful of sharp edges.

Step 3: Clean the Blade Separately

• Wipe the blade with a clean cloth and an appropriate cleaning agent.
• Recommended cleaning agents: petroleum benzene, isopropyl alcohol (choose based on material solubility).
• Prohibited: strong acids, strong alkalis, or solvents that may corrode the blade.

Step 4: Clean the Mounting Seat

• Also clean the contact surface of the blade mounting seat to ensure no residue remains.

Step 5: Inspect

• Check the blade for wear, dullness, or nicks.
• Check the blade for deformation.

Step 6: Dry

• Allow to air dry or wipe dry with a clean cloth.

Step 7: Reinstall

• Reinstall following the installation specifications.

3. Dynamic Cleaning Precautions

• If cleaning the roller while the 3 roll milling machine is still operating, ensure that no fabric can become entangled in the equipment. Only personnel with specialized training or relevant experience should clean the roller during operation. To reiterate: dynamic cleaning is a high-risk operation! Unauthorized personnel are strictly forbidden from attempting it.

4. Assessing Wear and Replacing the Doctor Blade
1. When Should It Be Replaced?
Immediate replacement is required if any of the following occurs:

• Unable to scrape cleanly: Obvious material residue remains on the roller surface, even after adjusting the pressure.
• Blade dullness: The blade edge is visibly rounded or thickened.
• Nicks or chipping: Visible nicks on the blade edge.
• Deformation: The blade is bent or twisted.
• Cracks in ceramic blades: Even small cracks can lead to breakage at any time.

2. Consequences of Wear
If the doctor blade of a 3 roll milling machine is worn or dirty, material cannot be properly scraped from the roller.

A worn blade leads to:

• Reduced discharge efficiency: Material remains on the roller surface, lowering output.
• Fineness fluctuations: Residual material may contaminate new batches or be re-milled, causing excessive fineness.
• Roller damage: Dried residue may scratch the roller surface.

3. Replacement Procedure

• Stop the machine, disconnect power, and adjust the gap to maximum.
• Remove the old blade, taking care to avoid injury.
• Thoroughly clean the blade mounting seat to ensure no residue remains on the contact surface.
• Prepare the new blade: inspect and remove any burrs.
• Install the new blade: ensure the direction is correct and the contact surface is clean.
• Adjust the contact pressure (see the follow-up article for details).
• Run the machine inching mode to observe the scraping effect.

Although small, the doctor blade represents the "final link" between grinding and discharge. A well-maintained blade ensures your material is successfully transformed into product; a worn blade can render all your milling efforts futile. Treat the doctor blade well—that means treating your roller well and your product well.

During the grinding process, the rollers of a triple roll mill often heat up—especially when processing high-viscosity materials or during prolonged continuous operation.
When the roller surface temperature exceeds 50°C, the equipment enters the "high-temperature danger zone" for triple roll mills. At this temperature, seemingly routine operations can lead to severe burn accidents. Today, we will explain the safe operating procedures for high-temperature rollers in detail.

Why Is 50°C the Warning Line?
How hot is 50°C?

• Immersing your hand in 50°C water causes intense pain within seconds.
• Contact with a 50°C metal surface for 1–2 seconds can cause superficial second-degree burns (blisters).
• At 70°C or above, contact can instantly cause deep second-degree burns or worse (skin necrosis).

The rollers of a triple roll mill can reach temperatures of 60°C, 80°C, or even higher during operation. Never attempt to confirm the temperature by "touching it to see"!

Which components may become hot?

• Roller surface: Direct contact with material friction, making it the hottest part.
• Discharge scraper: In close contact with the roller, its temperature approaches that of the roller surface.
• Material stop blocks: In contact with both the material and the roller, also reaching high temperatures.
• Near the bearing housing: The transmission parts may also generate heat.

Three Taboos for High-Temperature Operation
Taboo 1: Directly touching high-temperature components

Incorrect practices:

• Using your hand to test the roller temperature.
• Adjusting the material stop blocks with bare hands while they are hot.
• Wiping the roller surface while it is hot.

Correct practices:

• When temperatures exceed 50°C, do not touch heated machine parts.
• If operation is necessary, wait until the equipment cools to a safe temperature (no noticeable heat felt when the back of your hand is brought near).
• If operation must be performed while hot (e.g., in an emergency), wear heat-insulating protective gloves and long-sleeved clothing to protect your arms.

Taboo 2: Ignoring risks associated with high-temperature materials

Incorrect practices:

• Directly handling freshly milled high-temperature slurry.
• Using ordinary containers to hold hot materials.

Risk analysis:

• High-temperature materials may splash, causing skin burns.
• Some materials may release toxic vapors at high temperatures.
• Hot materials may deform or rupture unsuitable containers.

Correct practices:

• Allow the high-temperature material to cool before handling.
• If handling while hot is necessary, wear protective gloves, safety goggles, and long-sleeved protective clothing.
• Consult the material's Safety Data Sheet (SDS) to understand specific hazards at high temperatures.

Taboo 3: Improper cooling causing thermal shock

Incorrect practices:

• Immediately wiping a hot roller with a cold, wet cloth right after stopping the machine.
• Pouring cold cleaning agent directly onto a hot roller.

Risk analysis:

• Thermal shock can induce internal stress in ceramic rollers, potentially leading to micro-cracks or even bursting!
• Ceramic materials, while hard, are brittle and highly susceptible to sudden temperature changes.

Correct practices:

• Allow the rollers to cool naturally to room temperature before performing wet cleaning.
• To accelerate cooling, keep the temperature control system running to circulate cooling liquid and dissipate heat.
• Never splash liquid onto hot rollers!

3. Proper Use of the Temperature Control System
Triple roll mills are typically equipped with a cooling or temperature control unit to manage roller temperature. Proper use of this system ensures both grinding effectiveness and safety.

Connecting the temperature control unit

• Connect the inlet and outlet pipes according to the equipment manual.
• Ensure all pipe connections are secure and leak-free.

Flow adjustment: start low, then adjust
Key principle: Set the coolant/temperature control fluid flow rate low initially, then gradually adjust according to conditions.

Why?

• Excessively high flow may cause system overpressure, leading to leaks.
• Leaked temperature control fluid may damage equipment components (short-circuiting electrical parts, contaminating materials, corroding components).

How to adjust?

• At startup, open the valve to a small degree.
• Observe equipment operation and temperature changes, gradually increasing the flow rate.
• If fluid is observed exiting the overflow port, the flow rate is too high; reduce it via the supply valve.

Ensuring proper discharge
The temperature control system must be able to discharge fluid properly. If drainage is obstructed:

• System internal pressure will increase.
• Seals may become damaged.
• Cooling effectiveness will decrease, potentially leading to roller temperature runaway.

Emergency Response: What to Do If a Burn Occurs
If a burn happens:

• Remove from the heat source immediately: Stop contact with the hot component.
• Rinse with cool water: Flush the burned area with cool, running water for at least 15–20 minutes to reduce skin temperature.
• Do not apply ointments: Do not use toothpaste, soy sauce, or topical antiseptics, as these may worsen the injury or hinder medical evaluation.
• Cover and seek medical attention: Cover the area with a clean gauze and go to a hospital. Severe burns always require professional medical care.

50°C is a critical safety threshold for operating precision triple roll mills. Above this temperature, the equipment is hot, but the operator's mind must stay cool—maintain calm judgment, follow standardized procedures, and ensure proper protective measures. Burn scars are permanent, but the time needed to wait for cooling is fleeting. It’s not worth trading a moment of "while it's still hot" for a lifetime of scars.

Excessive load on the motor of a laboratory three roll mill is one of the primary causes of motor overheating, drive alarms, and equipment shutdown. In many cases, the issue of excessive load is not due to the motor itself but is caused by external factors. Whether it is a vacuum degassing mixer, vacuum mixer, or centrifugal mixer, such problems can occur. Today, we will break down the two core causes of excessive motor load and share targeted inspection methods to help you solve the problem at its source.

Core Cause 1: Abnormalities in the Rotating Parts of the Equipment

Sticking or lack of flexibility in the rotating parts (gears, bearings, mixing components) of the equipment can significantly increase the resistance to motor operation, leading to excessive load. This issue is common in laboratory three roll mills, vacuum mixers, and centrifugal mixers.

Targeted Inspection Methods:

• After powering off, manually rotate each rotating component (gears, bearings, mixing shaft) to check for any sticking or unsmooth operation. If sticking is present, further inspect for foreign objects causing blockage or component wear. Pay special attention to the connection points of the mixing shaft in laboratory three roll mills and centrifugal mixers.
• Check whether rotating parts have been contaminated by adhesive materials: If material leaks into rotating parts, it can solidify and adhere, obstructing rotation. Disassemble the components and clean any residual adhesive material using a specialized cleaning agent to ensure smooth rotation. This step is particularly critical for the maintenance of laboratory three roll mills.
• Inspect the lubrication condition of bearings and gears: Insufficient lubrication increases frictional resistance. Add high-temperature grease as needed, and if components are worn, replace them promptly to avoid a surge in motor load caused by excessive rotational resistance in laboratory three roll mills, vacuum mixers, and centrifugal mixers.

Core Cause 2: Abnormal Material Loading

Material loading quantity and condition that do not meet equipment requirements can cause the motor load to exceed its rated value, leading to failures. This is the most common issue in the daily operation of laboratory three roll mills and vacuum mixers, while the impact of such problems on load is more pronounced in centrifugal mixers due to their high rotational speeds.

Targeted Inspection Methods:

• Verify the loading quantity: Check whether the material in the container exceeds the equipment's maximum processing capacity. Whether it is a laboratory three roll mill, vacuum mixer, or centrifugal mixer, the loading quantity must be strictly controlled. If overloaded, reduce the material to within the standard range to avoid prolonged motor overloading.
• Inspect the material condition: If the material is agglomerated or has abnormally high viscosity, it will increase mixing resistance and lead to excessive load. Solutions: Pre-crush material agglomerates, adjust the material viscosity to within the equipment's suitable range, and modify mixing parameters if necessary. These measures are especially applicable for material processing in laboratory three roll mills and vacuum mixers.
• Check material distribution: Uneven material loading can cause unbalanced forces during mixing, indirectly increasing the motor load. Solutions: Rearrange the material to ensure it is evenly distributed within the container. This is crucial for the smooth operation of centrifugal mixers and also helps effectively reduce the motor load of laboratory three roll mills and vacuum mixers.

Troubleshooting Summary

When encountering motor overload issues, regardless of whether the equipment is a laboratory three roll mill, vacuum mixer, or centrifugal mixer, prioritize checking the two causes mentioned above. Over 90% of such faults can be resolved by addressing these factors. In daily operation, strictly adhere to the equipment's rated load for material loading, regularly clean and lubricate rotating parts, and fundamentally reduce the occurrence of overload failures. If no improvement is observed after troubleshooting, inspect the motor itself for faults and contact professional maintenance personnel for repair if necessary.

In the daily maintenance of a three-roll mill, cleaning the dam block is a routine operation. However, many operators might overlook a critical requirement: the roller gap must be adjusted to its maximum setting before cleaning the dam block.

Some might find it troublesome: "I'm just wiping the dam block, not touching the rollers. Why do I need to adjust the gap?"

Today, we will thoroughly explain the important reasoning behind this seemingly minor action from three perspectives: safety, equipment protection, and cleaning effectiveness.

What is a Dam Block and What is Its Function?

Location of the Dam Block:
The dam blocks are installed at both ends of the rollers on a three-roll mill, positioned tightly against the roller end faces, forming a "sealing wall." Their functions are:

• To prevent material from leaking out from the roller ends, ensuring all material is processed through the grinding zone.
• To control the distribution width of the material on the roll surface, preventing material from overflowing onto components like bearings.

Operating Condition of the Dam Block:
During operation, the dam block maintains a tiny gap with the roller end face – just enough to prevent material leakage without causing excessive friction. The setting of this gap is closely related to the roller gap.

Why Must the Gap Be Maximized Before Cleaning?

Safety – Preventing Tool Entanglement

When you remove the dam block, your hands and tools (screwdrivers, scrapers) need to reach into the area between the rollers. If the roller gap is very small at this time, any slip or mishandling of a tool can easily cause it to get jammed into the narrow gap.

More dangerously, if the equipment were to start accidentally (although power should be cut during cleaning, there is always a risk of misoperation), a narrow gap could instantly pull the tool in, potentially dragging your hand into the roller nip.

Effect of Maximizing the Gap:

• Increases the operating space, reducing the risk of tools getting caught.
• Even if a tool slips, it won't get trapped in a narrow crevice.

Equipment Protection – Preventing Roller Damage

During the removal of the dam block, if the roller gap is very small, the dam block itself might scrape against the roll surface when being taken out – this is especially critical for ceramic three-roll mills, where any scratch can lead to scoring or chipping.

Effect of Maximizing the Gap:

• Provides ample space between the dam block and the roll surface, preventing contact during removal and installation.
• Avoids damaging the roll surface due to accidental contact.

Cleaning Effectiveness – Ensuring Thorough Cleaning of Contact Surfaces

The "working face" of the dam block (the side that contacts the roller) is the focus of cleaning. If the roller gap is very small, this working face is confined in a tight space, making it difficult to wipe thoroughly.

Effect of Maximizing the Gap:

• Once the dam block is removed, all its surfaces can be easily accessed.
• Ensures that residual material on the contact face is completely removed, preventing it from drying and hardening, which could compromise the seal upon reinstallation.

Adherence to Equipment Design Logic

Ensuring the roller gap remains at its maximum throughout the cleaning process—removing dam blocks and scrapers for separate cleaning, and switching the gap adjustment to "maximum state"—is a standard practice not arbitrarily established, but based on the equipment's design logic:

• Cleaning Mode = Safe Mode = Maximum Gap Mode.
• Developing the habit of "always maximize the gap before cleaning" can prevent many simple, yet costly, errors.

Correct Steps for Cleaning the Dam Block

Step 1: Stop and Disconnect Power

• Ensure the equipment has completely stopped running.
• Disconnect the power supply or unplug the main plug – this is the primary principle before cleaning any component.

Step 2: Adjust Gap to Maximum

• Operate the gap adjustment knob/handle to open the roller gap to its maximum position.
• Double-check: Visually inspect that there is a clear gap between the rollers.

Step 3: Remove the Dam Block

• Use the appropriate tool (e.g., hex key) to loosen the retaining screws.
• Carefully remove the dam block, being cautious not to scratch the roll surface.
• If there are multiple dam blocks (feed side and discharge side), remove them one by one.

Step 4: Clean Separately

• Take the dam block to a workbench for cleaning, rather than wiping it while still on the equipment.
• Use a clean cloth and an appropriate cleaning agent to thoroughly wipe: ① The side that contacts the roller (critical!) ② The screw holes ③ All areas where material may adhere.
• Recommended cleaning agents: Petroleum benzene, isopropyl alcohol (choose based on the solubility of the material processed).

Step 5: Inspect Dam Block Condition

• Wear: Is there any noticeable wear groove on the working face?
• Deformation: Is the dam block bent or warped?
• Seal Integrity: Is the rubber sealing strip (if any) aged or damaged?

If any abnormalities are found, replace the dam block promptly to avoid affecting the grinding efficiency of the three-roll mill.

Step 6: Clean the Roller End Faces
With the dam block removed, the roller end faces are exposed – use this opportunity to clean them:

• Wipe the roller end faces with a cleaning cloth to remove residual material.
• Note: With the gap maximized, there is ample hand space, making this operation safe.

Step 7: Dry

• Allow all components to air dry naturally or wipe dry with a clean, lint-free cloth.
• Ensure no cleaning agent residue remains.

Step 8: Reinstall

• Place the dam block back into its original position.
• When tightening the screws, ensure even pressure – do not overtighten on one side, which could cause the dam block to tilt.
• If there is a specific gap requirement (e.g., maintaining a 0.1-0.2 mm gap from the roller end), adjust according to the equipment manual.

Step 9: Restore the Gap
After cleaning is complete, readjust the roller gap as needed for subsequent operation (usually gradually decreasing from the maximum state) to suit the upcoming grinding work.

Conclusion

Adjusting the roller gap to its maximum before cleaning the dam block – this seemingly simple action provides four layers of protection:

• Protects the Operator: Preents tool entanglement and reduces the risk of hand injuries.
• Protects the Rollers: Prevents scratches and damage, especially critical for fragile ceramic rollers.
• Ensures Cleaning Effectiveness: Guarantees the contact surfaces are thoroughly cleaned.
• Maintains Seal Integrity: Allows the dam block to fit tightly upon reinstallation.

Clean the dam block, but maximize the gap first – this isn't a hassle; it's a smart practice.

When explaining the operating specifications for a pharmacy ointment mill, there is a requirement that seems like a "minor detail" but is absolutely critical: operators must wear close-fitting clothing, and long hair must be tucked into a cap. Some people think this is making a mountain out of a molehill: "What's the big deal if I leave a little bit of hair out?" "Loose clothing is more comfortable to work in, isn't it?" Today, we will use real physical principles to tell you: This is not a dress code; it is a life-saving rule.

The "Entanglement Hazard" of Rotating Machinery

When the rollers of a pharmacy ointment mill rotate at high speed, their surface creates an invisible "tractive force field." Any soft object that comes into contact with the roller surface — whether it's fabric fibers, strands of hair, or a necklace pendant — will be instantly pulled in.

Why is the entanglement so fast?
Take a roller speed of 100 revolutions per minute as an example. The linear speed of the roller surface can reach several meters per second. When a strand of hair touches the roller, it can become completely wrapped around it within 0.1 seconds. A human's reaction time is at least 0.2-0.3 seconds — there's simply no time to pull back!

The Real Consequences of Four Common "Dangerous Attires"

Long Hair
Dangerous Scenario: You lean in to observe the material, a few strands of hair slip out from under your cap and lightly brush against the rotating roller.
Consequences:

• The hair is instantly entangled, violently pulling on the scalp.
• At best, a large clump of hair is torn out by the roots, causing permanent bald patches.
• At worst, it can cause scalp lacerations, or even drag the entire person towards the machine, resulting in the head striking the roller.

Loose Sleeves
Dangerous Scenario: You raise your hand to adjust the dam or retaining plate, and a loose sleeve cuff comes close to the end of the roller.
Consequences:

• Once the cuff is caught by the roller, your entire arm can be instantly pulled into the roller nip.
• The arm is compressed and torn in the narrow gap, causing severe damage to bones and soft tissues.
• Even with an immediate stop, crushing injuries are often irreversible.

Scarves / Neckties
Dangerous Scenario: You are wearing a scarf or tie and look down to check the discharge, and the dangling fabric touches the roller.
Consequences:

• The scarf is pulled in and tightens rapidly, acting like a "garrote."
• The neck suffers immense tensile force, which can lead to strangulation, cervical spine injury, or even death.
• Due to the extreme speed of entanglement, others simply don't have time to help.

Bracelets / Rings / Necklaces
Dangerous Scenario: You reach in to add material while wearing a metal bracelet, and the bracelet accidentally gets caught between the retaining plate and the roller.
Consequences:

• The metal bracelet deforms under the crushing force, potentially severing the wrist instantly.
• A ring can get caught between the roller and a guard, leading to a finger being torn off.
• A necklace can be pulled in, strangling the neck while also posing an electrocution risk (if the equipment has an electrical fault).

Proper Attire Specifications: "Tighten Up" for Safety

Mandatory "Close-Fitting" Requirements

• Upper Body: Wear well-fitted work clothes. Sleeves must be buttoned or have elasticized cuffs. There should be no flapping fabric.
• Lower Body: Pant legs must not drag on the floor. Wear pants with elasticized or tapered legs, or tuck pant legs into work boots.
• Hair: Whether long or short, hair must be completely tucked into a work cap or hairnet, with not a single strand exposed.
• Jewelry: Must be removed before operation: necklaces, bracelets, rings, earrings, scarves, ties.
• Gloves: If gloves are required, they must be tight-fitting cut-resistant gloves. Loose gloves are strictly prohibited.

The Daily "Self-Check Three Questions" Before Starting Work

• Are my sleeves buttoned tightly?
• Is all my hair completely tucked in?
• Am I wearing any jewelry today?

Why "Good Enough" is Not Acceptable

Some people might say: "I'm just going to take a quick look; I'll be right out. Nothing will happen." But the pharmacy ointment mill won't "take a quick look" and stop. Its rollers rotate several times every second. Your "quick look" is more than enough time for it to pull you in multiple times over.

There is no "good enough" when it comes to safety. There is only "safe" and "unsafe."

Wearing close-fitting clothes, tying up long hair, removing jewelry — these seemingly small actions are the "protective armor" you put on for yourself. Please remember: The pharmacy ointment mill does not recognize people, it only recognizes rules. Only those who follow the rules can go home safely.