Common problems of injection molding products
Release time:
2021-11-12
Increase the injection pressure, prolong the injection pressure holding time, reduce the temperature of the cylinder and mold, and force cooling in the place of dents.
1. Dent 2. Plastic products lack of material 3. Silver streaks 4. Deformation 5. Crack occurs 6. Stress cracking occurs 7. Mesh cracking occurs 8. Bleaching 9. Weld marks 10. Produce paste spots and so on.
Increase the injection pressure, prolong the injection pressure holding time, reduce the temperature of the cylinder and mold, and force cooling in the place of dents. Fill the upper edge where the dent was made. Make this part of the edge thicker when there is a narrow space in the material where the dent is made. Differences in the thickness of design products should be avoided completely. Easy to produce a dent reinforcement, narrow shape should be as short as possible. Increase mold temperature, feed cylinder temperature, increase injection pressure, add gas escape groove (depth 0.02~0.04mm) on the parting surface 5~10mm wide. Increase the gate, increase the flow edge, in the case of a large number of mold, the cavity is short of material to expand the gate of that cavity, and change the configuration of the flow edge, coupled with gas escape pin, improve the finish of the mold. Avoid the different thickness of the design product, in the product thickness of the place additional gate, understand the use of the product occasion, if appropriate, try to use good flow of materials. Dry the material completely. (Using high temperature and short time drying to do the effect is not good, generally at 85. C temperature drying for 4 hours) Increase the mold temperature, reduce the temperature of the heating cylinder, and insulate the injection nozzle of the cylinder. Thicken the edge of the stream. Avoid the difference in the thickness of the design products, and add the gate where the thickness of the products is thick. In the mold full cooling curing (prolong cooling time recorder), increase the cylinder temperature, reduce the injection pressure. The mold is cooled evenly. Avoid the difference of product thickness, set the gate (1-1) in the place where the product thickness is large, because the straight line is easy to cause warping, make a large R curve, product reversible bending mold, increase the number of ejecting rod, increase the release slope.
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