Piston Valves,Diaphragm Valves Co., Ltd. , http://www.nb-valves.com
1. Insufficient product 1. Lower temperature of barrel, nozzle and mold
2. The amount of feed is not enough
3. There is too much material left in the barrel
4. Injection pressure is too low
5. The injection speed is too slow
6. The runner or gate is too small, the number of gates is not enough, and the position is improper.
7. Die cavity exhaustion
8. Injection time is too short
9. The gating system is clogged
10. Poor material flowability
2. Product overflow 1. The temperature of the barrel, nozzle and mold is too high
2. The injection pressure is too high and the clamping force is insufficient.
3. The mold is not tightly sealed, and there are debris or template bending deformation.
4. Die cavity exhaustion
5. Raw material is too fluid
6. Too much feed
3. The product has bubbles 1. The plastic is poorly dried and contains moisture, monomers, solvents and volatile gases.
2. Plastic has decomposition
3. The injection speed is too fast
4. Injection pressure is too small
5. The mold temperature is too low and the mold filling is not complete.
6. Die exhaustion
7. Bring air from the feed end
4. Product inset 1. Insufficient feeding
2. The material temperature is too high
3. The product wall thickness or wall thickness is large
4. Injection and pressure keeping time is too short
5. Insufficient injection pressure
6. Injection speed is too fast
7. The gate is not in the proper position
5. Weld marks 1. The material temperature is too low, and the plastic has poor fluidity.
2. The injection pressure is too small
3. The injection speed is too slow
4. The mold temperature is too low
5. Die cavity exhaustion
6. Raw materials are contaminated 1. Raw materials contain water and volatiles 2. The temperature is too high or too low
6. The surface of the product has 3. The injection pressure is too low. The silver wire and the corrugation 4. The size of the runner gate is too large. 5. The insert is not preheated or the temperature is too low. 6. The internal stress of the product is too large.
Analysis of Common Defects and Causes of Refining
Common defects and causes of smelting