Flash is a common problem in injection molding

There are many reasons for burrs, and factors such as injection molding equipment, injection molds, injection molding processes, and raw materials need to be considered comprehensively.

1: Injection molding equipment

(1) The clamping force of the injection molding machine is not enough. When selecting injection molding equipment, the rated clamping force of the injection molding machine must be higher than the tension formed by the longitudinal projection area when the product is injected, otherwise it will easily cause mold expansion and burrs on the parting surface.

(2) Improper adjustment of the clamping device, the mold is not parallel, and there will be burrs on the parting surface during injection.

(3) The injection mold itself has poor parallelism or is not parallel when loading the mold, which may lead to loose mold clamping and burrs on the parting surface.

Two: Mold aspect

The precision of the injection mold is poor. The poor flatness of the mold core leads to gaps and burrs on the parting surface when the mold is closed.

Three: Injection molding process

(1) The pressure is too high or the speed is too fast during injection molding. Due to high-pressure and high-speed injection molding, the mold opening force increases, resulting in overflow.

(2) Too much material is added during the injection molding process, resulting in burrs.

(3) Excessively high temperature of the injection molding machine barrel, nozzle or mold will cause the viscosity of the plastic to decrease and the fluidity of the plastic to increase, which will also cause burrs on the parting surface.

Four: raw materials

(1) Too high or too low viscosity of the plastic material will cause burrs on the parting surface.

(2) The uneven size of plastic particles will change the feeding amount of the barrel, and there will also be burrs on the parting surface.

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