Frequently asked questions about injection molding products

2021-11-12

Increase the injection pressure, prolong the injection holding time, reduce the barrel temperature and mold temperature, and force cooling at the place where the dent occurs.

Frequently asked questions about injection molding products

1. Dents 2. Plastic products lack of material 3. Silver streaks 4. Deformation 5. Cracks 6. Stress cracks 7. Reticular cracks 8. Whitening 9. Fusion marks 10. Paste Madara and so on.

Increase the injection pressure, prolong the injection holding time, reduce the barrel temperature and mold temperature, and force cooling at the place where the dent occurs. Fill in the edge where the dent occurs. When there is a narrow space on the edge of the material where the dent occurs, thicken the edge of this part. The difference in the thickness of the designed product should be completely avoided. For ribs that are prone to dents, the long and narrow shape should be kept as short as possible. Increase the temperature of the mold, the temperature of the feeding cylinder, increase the injection pressure, and add a gas escape groove (depth 0.02~0.04mm) on the parting surface with a width of 5~10mm. Enlarge the gate and increase the flow edge. In the case of a large number of molds per mold, if the cavity is short of material, the gate of that cavity will be enlarged, and the configuration of the flow edge will be changed, and the gas escape pin will be added to improve the mold. of smoothness. Avoid designing different thicknesses of products, add gates where the products are thicker, understand the occasions where the products are used, and try to use materials with good fluidity if appropriate. Dry the material completely. (Drying at high temperature for a short time is not effective, and it is generally dried at 85°C for 4 hours). Increase the mold temperature, reduce the temperature of the heating barrel, and keep the barrel injection nozzle warm. Make the flow edge thicker. Avoid designing product thickness differences, and add gates where the product thickness is thick. Fully cool and solidify in the mold (extend the cooling time timer), increase the barrel temperature, and reduce the injection pressure. Allow mold cooling to homogenize. To avoid the difference in the thickness of the product, set the gate (1-1) at the place where the thickness of the product is large, because the straight line is easy to cause warping, make a large R curve, and the mold with reversible bending of the product increases the number of ejector rods and increases the ejection Die slope.