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The twelve most common injection molding problems and solutions (5)
admin    2016-01-19    174

The fusion mark is caused by the cooling of the front part of the molten resin from different directions and the incomplete fusion at the junction. Generally, it mainly affects the appearance, painting and electroplating. In serious cases, it will affect the strength of products (especially in the case of fiber reinforced resin).
The following items can be referred to for improvement:

(1) Adjust molding conditions to improve liquidity. For example, increase the resin temperature, mold temperature, injection pressure and speed.
(2) It is also beneficial to exhaust by adding an exhaust slot and setting a push rod at the place where the weld line is generated.
(3) Minimize the use of release agent.
(4) Set up the process overflow and use it as the place where the weld line is generated, and then cut off and remove it after forming.
(5) If it only affects the appearance, it can change the position of the burn four to change the position of the weld line. Or, the part where the weld line is produced shall be treated as a dark glossy surface for modification.

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