The shortcomings and anomalies of the plastic granulator are ultimately reflected in the quality of the granules.
First, how to overcome the lack of product extrusion When the product is insufficient, the material is often solidified before the cavity is filled. Of course, there are many other reasons.
1 Equipment reasons: a. Hopper interrupted material: b. Some or all of the hopper neck is blocked; c. The feeding amount is not enough; d. The feeding control system operation is abnormal: e. The plasticizing capacity of the injection molding machine: f. The injection cycle caused by the equipment is abnormal.
2 Extrusion conditions Cause a. The injection pressure is too low; b. The injection pressure loss is too large during the extrusion cycle; c. The injection time is too short; d. The injection full pressure is too short; e. The injection rate is too slow: f. The flow in the cavity is interrupted; g. The filling rate is not equal; h. The injection cycle caused by the operating conditions is abnormal.
3 temperature reasons: a. increase the barrel temperature; b. increase the nozzle temperature; c. check the millivoltmeter, thermocouple, resistance electric heating coil (or far infrared heating device) and heating system; d. improve the mold temperature; e. Check the mold temperature control device.
4 mold reasons: a. the flow path is too small; b. the gate is too small; the nozzle hole is too small; d. the gate position is not reasonable; e. the number of gates is insufficient: f. the cold material hole is too small; g. insufficient exhaust; h. The injection cycle caused by the mold is abnormal.
5 Material reasons: material fluidity is too poor.
2 Extrusion conditions Cause a. The injection pressure is too low; b. The injection pressure loss is too large during the extrusion cycle; c. The injection time is too short; d. The injection full pressure is too short; e. The injection rate is too slow: f. The flow in the cavity is interrupted; g. The filling rate is not equal; h. The injection cycle caused by the operating conditions is abnormal.
3 temperature reasons: a. increase the barrel temperature; b. increase the nozzle temperature; c. check the millivoltmeter, thermocouple, resistance electric heating coil (or far infrared heating device) and heating system; d. improve the mold temperature; e. Check the mold temperature control device.
4 mold reasons: a. the flow path is too small; b. the gate is too small; the nozzle hole is too small; d. the gate position is not reasonable; e. the number of gates is insufficient: f. the cold material hole is too small; g. insufficient exhaust; h. The injection cycle caused by the mold is abnormal.
5 Material reasons: material fluidity is too poor.
Second, particle defects can be divided into the following points:
1. Insufficient injection of the product;
2 product overflow;
3 product dents and bubbles;
4 products have seams;
5 products are brittle;
6 plastic discoloration;
7 products have silver, markings, and flow marks;
8 product turbid at the gate;
9 product warpage and shrinkage;
10 product size is not allowed;
2 product overflow;
3 product dents and bubbles;
4 products have seams;
5 products are brittle;
6 plastic discoloration;
7 products have silver, markings, and flow marks;
8 product turbid at the gate;
9 product warpage and shrinkage;
10 product size is not allowed;
3. How to overcome the flashing of the product by the plastic granulator. The overflow of the product is often caused by the defects of the mold. Other reasons are: the injection force is greater than the clamping force, the material temperature is too high, the exhaust gas is insufficient, the feeding is excessive, and the mold is a dip. There are foreign objects and so on.
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