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Line marks on the injection mold products, how to repair?

In the injection mould products surface, if showing a line marks, we should judge it was gas welding marks or scars? Mainly due to gas mark is produced by injection mold exhaust caused by bad, relatively good workpiece surface, would appear to be more dark. mainly due to the weld line is generated by the intersection of the plastic in the mold cavity will produce the weld lines, weld lines are unavoidable, can be used to increase flow rate, temperature, pressure, and other methods of reducing the apparent surface of the weld line to meet the requirements needed.

Fix two marks on the injection mold products are as follows:

The place where there is gas mark do some inserts:

1 plus exhaust can vent inserts molded in inserts in public;

2 Improved plastic mouth, or mouth into the plastic to increase the flow channel dimensions increased stiffener

3 products plus glue, or bottom

4 using high-pressure low-speed injection

5 die temperature rises

Weld line is to follow up the plastic mouth piece in the monument opposite direction, by adjusting the position of the plastic injection mold product not played, the product was out of position tuned piece of gum rift rift point of view on both sides of the plastic mouth is not very smooth, if it is, then it is the welding marks. From the reasons for the formation of weld lines, in order to reduce the weld lines, it is necessary to reduce injection or extrusion process material "after shunt convergence" phenomenon possibilities. In order to reduce and eliminate this phenomenon, the following methods:

1 Increase the mold temperature

2 Adjusting the injection speed

3 Full Exhaust

4 Keep the mold surface clean

5 Adjust the injection pressure and fill plastic pressure


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