Welcome to ANDA
Welcome to ANDA
PVC powder overheating during grinding is easy to spot: the powder turns yellow or brown, the workshop smells sharp, the screen output becomes inconsistent, and a product made with recycled powder loses surface quality. The root cause is friction heat that is not removed fast enough. For PVC scrap, a good grinding setup must control temperature, gap, feed, airflow, and recycle rate together.
This guide explains why PVC powder overheats in a pulverizer and how to correct the problem without simply slowing the rotor. It also shows how cooling, disk material, particle-size control, and cyclone separation affect the quality of recycled PVC powder.
Check the first few minutes of a run, not only the final silo. A temperature rise often appears before visible discoloration. Track the grinding-chamber temperature, pipe temperature, motor current, powder color, smell, mesh result, and feed rate together.
Observed sign | Likely cause | First response |
Yellow or brown powder | Friction heat or long residence time | Check cooling water and disk gap |
Motor current climbs | Overfeeding or blocked airflow | Reduce feed and inspect conveying |
Fine powder sticks to the chamber | Heat-softened PVC or moisture | Improve cooling and dry the feed |
Mesh becomes unstable | Worn disks or overloaded screen | Check disk clearance and screen |
Sharp odor or smoke | Severe thermal degradation | Stop safely and inspect the chamber |
Anda's PVC Pulverizer Machine is designed for recycling rigid PVC scrap such as edge trim, pipes, profiles, ceiling panels, and rejected sheets. The line can grind hard material into reusable powder for extrusion, compounding, and other PVC processing.
Grinding converts motor power into size reduction and heat. The rotating disk rubs and impacts the material against the fixed disk. If the feed is too large, too fast, wet, or packed with mineral filler, the chamber needs more power. A small gap increases fineness but also raises friction.
PVC is heat-sensitive. Once the chamber temperature rises, the powder can soften and smear instead of breaking cleanly. Smearing blocks the gap, increases motor load, and creates a loop: more load creates more heat, and more heat creates more smearing.
Do not treat all PVC scrap as one material. Thick pipe, window profile, edge band, foam board, and mixed post-consumer parts have different feed sizes and heat behavior. The supplied process guidance recommends pre-crushing hard scrap and feeding pieces around 5–8 mm into the pulverizer.
The PVC recycling equipment range from Anda is planned around the scrap type, target mesh, and downstream extrusion requirement rather than one fixed setting for every waste stream.
An uneven feed creates hot spots. A sudden slug of heavy PVC fills the grinding gap, raises current, and reduces the time available for cooling. A feed that is too fine can also pass through the chamber too quickly and overload the screen.
Use a controlled pre-crusher or shredder for large pieces. Remove metal, stones, and other hard contamination before it reaches the disks. Keep the feed conveyor steady and record the material type when color or temperature changes.
If the motor current rises, reduce feed first. Do not immediately open the disk gap, because a wider gap can lower friction but may produce oversized particles and send more material back for re-grinding.
Anda's PVC Pulverizer Machine accepts pre-crushed PVC feed in the documented 5–8 mm range. The practical target is a steady stream that the disks can cut and disperse without a packed chamber.
The strongest correction for PVC powder overheating is continuous heat removal. The supplied Anda design uses a dual water-cooling arrangement around the grinding chamber, the rear of the dynamic disk, and the conveying pipes. Stable water flow removes heat where it is created and while powder is being transferred.
Check inlet temperature, return temperature, flow, pump operation, hose blockage, and leaks. A normal control-panel reading does not prove that water is circulating through every jacket. Compare the temperature at several points during a full run.
Anda's product information states that the milling temperature can be maintained below 50°C under suitable operating conditions. At that temperature, recycled powder is less likely to discolor or lose the properties needed for re-feeding into PVC profile or board production.
For a new PVC powder grinding line, specify cooling capacity together with disk diameter, motor power, target mesh, and expected feed rate. A large rotor without enough cooling will not solve an overheating problem.
A narrow gap produces finer powder, but it also increases friction and heat. A wide gap lowers heat generation but may leave too much oversize for the screen. The right clearance depends on the requested mesh and the behavior of the scrap.
The supplied equipment uses an external mechanical or digital micro-adjustment system. Operators can change the fixed-to-rotating disk clearance without opening the hot chamber. This makes a controlled trial safer and faster than manual adjustment inside the machine.
Start with a moderate setting, collect a sample, check mesh and temperature, then move in small steps. The documented range includes fine powder settings from about 20 mesh to 80 mesh depending on the configuration and material.
Anda's PVC Pulverizer Machine uses hardened chromium-alloy grinding disks with heat treatment and surface nitriding. The stated benefit is longer wear life when processing abrasive rigid PVC containing calcium carbonate, helping the gap remain stable for longer production periods.
Hot powder that stays in the chamber too long will continue to heat. Negative-pressure conveying removes ground material quickly and limits dust escape. A centrifugal fan, cyclone separator, and vibrating screen work as one system: qualified powder goes to the silo while oversized pieces return for another pass.
Inspect fan rotation, duct sealing, cyclone blockage, rotary valve operation, and screen loading. If airflow is weak, powder may build up in the chamber or pipe. If airflow is too strong for the screen, fine powder may separate poorly and carryover can increase.
Anda's negative-pressure conveying and cyclone separation design supports a cleaner workshop and automatic re-grinding of oversized particles. The Anda Machinery contact page can be used to discuss fan, screen, and silo sizing for a specific PVC waste stream.
Rigid PVC scrap with high calcium-carbonate content wears ordinary steel disks quickly. As the disk surface changes, the gap becomes uneven, motor load rises, and particle size drifts. Operators often respond by tightening the gap, which creates even more heat.
Inspect the fixed and rotating disks on a planned schedule. Look for rounded cutting edges, grooves, cracks, and uneven wear. Replace or recondition parts before the powder color and mesh result move outside the process window.
The documented MF600 and MF800 configurations use 600 mm and 800 mm grinding diameters. Their stated outputs are approximately 150–200 kg/h and 400–600 kg/h respectively, depending on mesh and material. Treat these figures as configuration references, not a promise for every scrap mix.
Item | MF600 | MF800 |
Grinding diameter | 600 mm | 800 mm |
Main motor | 45 kW | 90 kW |
Feed size | 5–8 mm | 5–8 mm |
Typical powder range | 10–30 mesh | 20–40 mesh |
Approximate output | 150–200 kg/h | 400–600 kg/h |
Cooling pipe | Double-layer water cooling | Double-layer water cooling |
The MF600 configuration lists 12 fixed knives and 24 rotating knives, while the MF800 lists 36 fixed knives and 20 rotating knives. Knife arrangement, motor power, screen diameter, and target mesh all affect the heat balance. A larger machine is not automatically cooler if it is run outside its intended feed and mesh range.
1. Stop the line safely if there is smoke, sharp odor, or severe discoloration.
2. Check feed size, contamination, moisture, and feed consistency.
3. Verify cooling-water flow and temperature at the chamber and pipes.
4. Check disk wear and measure the current clearance.
5. Inspect fan, ducts, cyclone, rotary valve, and vibrating screen.
6. Reduce feed or widen the gap slightly, then collect a controlled sample.
7. Compare powder temperature, color, mesh, and motor current after stabilization.
Keep a short production record for each scrap type. The useful fields are feed description, mesh, water temperature, motor current, output, powder temperature, and color. This record makes it easier to return to a proven setting after maintenance.
Zhangjiagang Anda Machinery Co.,Ltd. develops PVC pulverizing and recycling equipment for factories that need to turn hard PVC waste into a usable secondary raw material. The documented system combines cooling, grinding, external gap adjustment, negative-pressure conveying, cyclone separation, and screening. Buyers are welcome to watch the PVC pulverizer machine video to review the equipment sequence.
PVC powder overheating in grinding is usually a process-balance problem, not simply a rotor-speed problem. Stabilize the feed, remove heat with water cooling, set the disk gap for the target mesh, keep airflow and separation clear, and inspect disk wear before tightening the clearance. These steps protect powder color, mesh consistency, equipment life, and the value of recycled PVC.
The grinding chamber is generating more friction heat than the cooling system can remove. Check feed overload, disk gap, water flow, disk wear, and residence time.
Anda's supplied product information states that the milling temperature can be maintained below 50°C under suitable conditions. The actual target depends on the formulation and process.
Yes. A smaller disk clearance increases friction and residence time. Use the coarsest gap that still meets the required mesh and let the screen remove oversize.
It removes ground powder from the hot chamber, reduces dust leakage, and sends qualified material through cyclone and screen separation.
Typical feed includes PVC edge trim, pipes, door and window profiles, ceiling panels, sheets, and other hard PVC parts after suitable pre-crushing and contamination removal.
