Product shrinkage injection molding machine commissioning: quantitative feeding - melting plasticizing - pressure injection - mold cooling - mold removal. After removing the plastic part, the mold is closed again for the next cycle.
Action procedure: mold closing → premolding → shrinking → (nozzle forward) → injection → pressure holding → (nozzle backward) → Cooling → mold opening → ejector → Door opening → workpiece taking → door closing → Mold closing. Injection molding machine is also known as injection molding machine or injection machine. It is the main molding equipment for making thermoplastic or thermosetting plastics into plastic products of various shapes using plastic molding molds. Divided into vertical, horizontal, all electric. The injection molding machine heats the plastic, applying high pressure to the molten plastic, causing it to shoot out and fill the mold cavity.
Injection molding is a very complex process, so there are many reasons for shrinkage, and specific problems should be analyzed.
1. The back of the reinforcement is shrinking, considering the product to reduce meat, the thickness of the reinforcement is generally about 0.5 times the thickness of the product, and the reinforcement is too thick to cause shrinkage.
2. If the overall wall thickness of the product is too thick or uneven, consider reducing the wall thickness or treating the wall thickness evenly.
3. Improper selection of injection molding machine, insufficient measurement, consider choosing the right injection molding machine.
4. Mold temperature is too high, consider appropriate reduction of mold temperature.
5. If the inlet is too small, consider increasing the inlet appropriately.
6. Short holding time or insufficient holding pressure or insufficient injection pressure.
7. If the injection speed is insufficient, increase the injection speed appropriately. And so on
Shrinkage, product shrinkage generally depends on the mold structure into the glue point, the meat thickness of the problem. Injection molding machine to adjust the pressure, the pressure is too large products may also appear sticky mold, batch front.