a) the formation:
The black mark at the end of the flow (the air is retained), the V-shaped marks, different colored lines, especially when using inorganic color then weld (weldline) appears as the gray road. Easy to see in the dark or products with a glossy surface.
b) Cause
- Close to phenomena not filling mold products.
- The design of the path entrance plastic case met ly.Cac flow.
- The atmosphere is no place to escape.
- The impact of color, the position weldline usually affects the mechanical properties.
c) The Fix
- Solve solutions like product defects not fill the mold.
- Check exhaust system of mold or adding gas drainage.
- It can be designed to take the road to the location weldline invisible and non-structural (improving the flow, flow restriction), testing equipment if necessary, the plan expanded stem injection, avoid changing thickness of the sudden and complete heterogeneous mold.
- Use materials with lower viscosity.
- Identification of specific areas by analyzing MOLDFLOW, eg : designing the right shape, location and gateway distribution right plastic products reasonable thickness.
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