Solution of fusion marks of the product during injection molding

The fusion mark refers to the surface defect caused by the encounter and fusion of two material streams. It is a linear trace on the surface of the plastic parts, which is produced by the front part of the molten resin from different directions being cooled and failing to fully fuse at the junction. In general, it mainly affects the appearance, affecting the coating and electroplating.

1. Cause analysis

(1) Uneven temperature

During the injection process, the uneven temperature of the mold will lead to the melt temperature being too high or too low during the flow process, resulting in poor fusion and fusion marks.

(2) Uneven pressure

If the pressure of the mold is not balanced, the flow of the melt in the mold will be hindered, resulting in poor melting and melting marks.

(3) The injection molding speed is too fast

Too fast injection speed will make the melt unable to completely fuse during the flow process, forming fusion marks.

(4) Improper mold surface treatment

The rough or improper treatment of the mold surface with dirt will affect the flow and fusion of the melt, leading to the production of the fusion marks.

(5) The melt quality is poor

Melt contains impurities or water, which will reduce the quality of the melt and affect the fusion effect, leading to the production of fusion marks.

(6) Improper selection of plastic materials

Different kinds of plastic materials have different melting points and liquidity energy, and the selection of improper plastic materials will affect the fusion effect, resulting in the production of fusion marks.

2. The Solution

(1) Ensure that the mold temperature is uniform to avoid poor melting due to too high or too low temperature in the melt flow process.

(2) Adjust the injection pressure to ensure the balanced pressure balance of the mold, and optimize the injection pressure to promote the uniform flow and good fusion of the melt.

(3) Reduce the injection molding speed appropriately, so that the melt has enough time to fuse in the flow process, and reduce the generation of fusion marks.

(4) Keep the mold surface clean, clean and maintain the mold regularly, to ensure that the surface of the mold is smooth and free of dirt, so as to reduce the generation of fusion marks.

(5) Improve the quality of the melt to ensure that the melt does not contain impurities or water, so as to improve the fusion effect.

(6) Select the appropriate plastic materials to ensure that the melting point and fluidity of the plastic materials can meet the production requirements.

(7) Optimize product design, optimize product structure, reduce the number of fusion points, and reduce the risk of fusion marks.

(8) Adjust the number and position of gates, reduce the number of gates or adjust the position of gates, and reduce the diversion and fusion phenomenon of melt in the mold.

(9) Adjust the molding conditions, improve the fluidity, improve the resin temperature, improve the mold temperature, improve the injection pressure and speed, etc.

(10) Add the exhaust tank, and setting the push rod at the generation place of the fusion mark is also conducive to the exhaust.

(11) If only the appearance is affected, the four burning position can be changed to change the position of the fusion mark. The parts produced by the fusion mark is treated as dark gloss surface and modified.

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