In the process of production of injection molds , weld lines are often formed due to convection of plastic. The weld line is caused by the front end portion of the molten resin from different directions being cooled and not being completely fused at the joint. Under normal circumstances, it mainly affects the appearance and affects painting and plating. In severe cases, it has an effect on the strength of the product (especially in the case of fiber reinforced resins).
Can be improved by referring to the following items:
l. Adjust molding conditions and improve liquidity. For example, increase the resin temperature, increase the mold temperature, increase the injection pressure and speed.
2. Adding an exhaust groove, and setting the push rod at the place where the weld line is generated is also advantageous for exhausting.
3. Minimize the use of release agents.
4. Set the process flash as the place where the weld line is formed, and then cut and remove after molding.
5. If only the appearance is affected, the four positions can be changed to change the position of the weld line. Alternatively, the portion where the weld mark is produced may be treated as a dark glossy surface or the like.
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