In injection molding, especially the injection molding of automotive plastic manufacturers, PEEK injection molding manufacturers may encounter some common problems during mold trial. The following is a detailed analysis of these problems:
1. Shrinkage marks
I. Characteristics of injection molded part defects
Shrinkage marks are usually related to appearance defects and are marks formed when the plastic is shortened and separated from the mold surface.
II. Possible causes of problems
– (1) The melt temperature is too high or too low.
– (2) Insufficient plastic in the mold cavity.
– (3) The surface of the injection molded part that contacts the plastic is overheated during cooling.
– (4) The runner design is unreasonable and the gate section is too small.
III. Remedial measures
– (1) Adjust the temperature of the injection cylinder.
– (2) Adjust the screw speed to obtain the correct screw surface speed.
– (3) Increase the injection volume.
– (4) Ensure the correct gasket is used; increase screw advance time; increase injection pressure; increase injection speed.
2. Encapsulation
I. Characteristics of injection molded part defects
Encapsulation can usually be easily observed in the “air trap” of transparent injection molded parts, and may also occur in opaque plastics. This defect is related to the thickness of the plastic and is often caused by the plastic shortening in the middle of the injection molded part.
II. Possible causes of the problem
– (1) The mold is not fully filled.
– (2) The stop valve is not operating properly.
– (3) The plastic is not completely dry.
III. Remedial measures
– (1) Increase the shot size.
– (2) Increase the injection pressure.
– (3) Increase the screw advance time.
As a professional PEEK injection molding manufacturer, we attach great importance to identifying and solving these problems during the mold trial process to ensure the production of high-quality automotive plastic parts that meet the strict requirements of our customers.
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