The six most prone to problems in the casting process of injection molded parts

1: Product flash (film).

Most of these defects are in the parting surface of the mold, the ejector, the slider, and the insert.

2: The product is short of material.

Most of them are located farthest from the gate and the thinnest part of the wall.

3: Product shrinking. In the wall thickness or where there are ribs.

4: Weld marks are in the product where there are holes (including the grille) and where the inserts are placed.

5: Silver silk has two reasons

(1) The material is not completely dry.

moisture

The phenomenon is distributed along the wall thickness. There is a silk or creaking sound when the glue is injected, and the raw materials are not bright, and there are fine bubbles on the surface. PC and aBS materials are the most obvious.

(2) Decomposition gas

The degraded silver wire is partially degraded by the thermoplastic after being heated, and small bubbles are formed on the surface of the plastic part when the gas is decomposed. The traces left by these small bubbles on the surface of the plastic part are generally arranged in a "V" shape, "V" The tip is facing away from the center of the gate.

6: Product deformation

Some products such as flat, long and box, you must also pay attention to whether the product is deformed when making quality judgments.