Plastic Extruder Tips 4: The Choice of Plastic Extrusion Pelletizing System

The Choice of Plastic Extrusion Pelleting System

Posted by Andy

There is total 5 kinds cutting system in the process of plastic extrusion pelletizing: water cooling strand cutting system; air cooling strand cutting system; water ring hot cutting system; air cooling hot cutting system; underwater hot cutting system.

We can compare this 5 kinds cutting system with this basic information:

1.Application:

  1. The water cooling strand cutting system can use for most of the different kinds of plastic, except that which one cannot touch with water;
  2. The air cooling strand cutting system normally use for PP/PE high filling masterbatch, biodegradable plastic, some material which cannot touch with water;
  3. The water ring hot cutting system use for PE filler masterbatch etc.;
  4. The air cooling hot cutting system use for high filling masterbatch, soft PVC, WPC etc.;
  5. The underwater hot cutting system can use for most kind of plastic also.

2.Cost:

  1. The water cooling strand cutting system is the cheapest way for plastic extrusion pelletizing, only the water cooling tank, dryer and pelletizer is enough;
  2. The air cooling strand cutting system needs longer conveyor belt to drop down the plastic strand temperature, but the conveyor belt cost is not cheap;
  3. The water ring hot cutting system pelletizer and dewatering machine price is higher than water cooling system, and it will also need one water chiller for the cycle water;
  4. The air cooling hot cutting system uses 3 stage cyclone to cool down the pellets, its cost is a little higher than water cooling strand cutting system & a little cheaper than the water ring cutting system;
  5. The underwater hot cutting system is the highest cutting system. Because it is suitable for almost every kind of plastic pelletizing and some special material must use it, like TPE/TPR/TPU etc. The pellets shape is also the best beautiful.

3.Pellets Shape

  1. The pellets after water cooling strand cutting system just like small pieces cylinder;
  2. The pellets after air cooling strand cutting system is similar as water cooling strand cutting system, but sometimes if the material is sticky, it will stick on the belt, affecting the appearance;
  3. The pellets after water ring hot cutting system like the pill;
  4. The pellets after air cooling hot cutting system like the pill also, but it will be a little deformed during air cooling & transport;
  5. The pellets after the underwater hot cutting system like the small ball.

4.Moisture of Pellets

  1. The pellets after water cooling tank are just dried by the blower, so it won’t be very dry, we need to add more blowing dryer or special design dryer;
  2. The pellets after air cooling strand cutting system without moisture;
  3. The pellets after water ring hot cutting system will be removed water from the dewatering machine, just a little moisture;
  4. The pellets after air cooling hot cutting system without moisture;
  5. The pellets after the underwater hot cutting system will be removed water by the high-speed dewatering machine, the moisture can be controlled less than 0.5%.

Here is some common compounding plastic pelletizing method suggestion:

If you want to know more information about a plastic pelletizing machine, please contact:

Mr.Andy, WhatsApp:+86-18550112020, Email: weishunzhou@gmail.com

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