How Can The Plastic Granulator Be Used For a Long Time? Common Problem Analysis

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During the production and operation of the plastic granulator, it must strictly implement according to the standards to extend its service life. How can the plastic granulator be used for a long time?

  1. Never use low-quality recycled materials with metal impurities or silt. Do not place metal objects that may fall near the feed inlet. Place them into the feed hopper to aggravate the wear of the screw and barrel or cause jamming. , Damage phenomenon;
  2. Be sure to pay attention to fire safety, and it is forbidden to smoke and carry lighters next to the machine
  3. Non-workers are not allowed to watch around, let alone operate by hands;
  4. Lubricating oil should add to the parts of the machine frequently to increase fluency;

Achieving these can significantly reduce the failure of the plastic granulator and increase the service life.

1 Maintenance method of plastic granulator

  • First of all, the plastic granulator should be placed in a ventilated position to ensure the heat dissipation of the motor and extend its life;
  • Lubricate the bearings regularly to ensure the lubricity between the bearings;
  • Regularly check the screw of the knife. After using the new plastic granulator for 1 hour, tighten the screws of the movable knife and the fixed knife with tools to strengthen the fixation between the blade and the knife holder;
  • To ensure the sharpness of the cutting tool, the tool should frequently check to ensure its sharpness and reduce unnecessary damage to other parts caused by the blunt blade;
  • When changing the tool, the gap between the movable knife and the fixed knife: 20HP or more. The thinner the recycled material, the more significant the gap can be adjusted appropriately;
  • Before starting for the second time, the remaining scraps in the machine room should remove to reduce the starting resistance;
  • The inertia cover and the pulley cover should open regularly, and the ash outlet under the flange should clear because the powder material discharged from the plastic granulator chamber enters the shaft bearing;
  • The plastic granulator should be well-grounded.
PLA PBAT biodegradable compounding machine
PLA PBAT biodegradable compounding machine

2 Why is the plastic granulator insufficiently extruded?

Insufficient product injection is often because the material has solidified before filling the cavity. Of course, there are other reasons, such as:

Temperature reason

Increase the temperature of the barrel and nozzle of the plastic granulator, check the millivoltmeter, thermocouple, resistance electric heating ring or far-infrared heating device and heating system, increase the mould temperature, and check the mould temperature control device.

Mould reason

The plastic granulator runner is too small, and the gate is too small, the nozzle hole is too small, the gate position is unreasonable, the number of gates is insufficient, the cold material cavity is too small, the exhaust is insufficient. The injection cycle caused by the mould is abnormal.

Casting Film Roller
Casting Film Roller

Equipment reason

The hopper is interrupted, the neck of the hopper is wholly or partially blocked, the feeding amount is insufficient, the feeding control system is not operating normally, the plasticizing capacity of the injection press, and the injection cycle caused by the equipment are abnormal.

Causes of extrusion conditions

The injection pressure of the plastic granulator is too low, the injection pressure loss during the extrusion cycle is too significant, the injection time is too short, the injection total pressure time is too short, the injection rate is too slow, the flow in the cavity is interrupted, and the filling rate is not equal, Abnormal injection cycle caused by operating conditions.

3 The plastic granulator head is not smooth or blocked

First of all, we need to know the reasons for the poor discharge or blockage of the pelletizer head:

  1. Is there any foreign matter that is not easy to melt;
  2. A specific section of the heater does not work, and the material is poorly plasticized;
  3. The operating temperature is set too low, or the molecular weight distribution of the plastic is wide and unstable.
jwell biodegradable plastic compounding machine
jwell biodegradable plastic compounding machine

How to deal with the poor discharge of the plastic granulator head:

  1. Check the heater and replace if necessary;
  2. Clean and check the extrusion system and the machine head;
  3. Verify the set temperature of each section and negotiate with the technician if necessary to increase the temperature set value.

4 Why is the main machine of the plastic granulator not rolling?

Reasons why the main machine of the plastic granulator does not roll or stops momentarily:

  1. The main power supply is not connected properly
  2. The heating time is insufficient, or one of the heaters does not work, resulting in excessive torque and overloading of the electric idea.

The treatment method of the main machine of plastic granulator without rolling:

  1. Check whether the host circuit is connected and switch on the power supply;
  2. Check the temperature display of each section and confirm the warm-up time of preheating;
  3. Check whether each heater is damaged or has poor contact, and eliminate it;
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