Injection molding refers to the plastic box seat of the electronic connector is made by injecting the molten plastic into the metal tire film, and then rapidly cooling and forming. The plastic box seat of the electronic connector is made in the injection molding stage.
The factors that should be paid attention to during injection molding of the material are: drying, material temperature, mold temperature, control of injection rate, back pressure setting, etc. If there is insufficient preparation before injection molding or injection molding conditions are not set well, many defects will occur:
1) Flash: The material has good fluidity, slow cooling, improper product or mold design, and burrs. Or the clamping force of the mold is not enough, which causes the mold to not be closed well, and a lot of burrs appear on the edge of the product, which is called flash.
2) Warpage: The thermal stress of the material is too large, and the thickness of the product is uneven, resulting in inconsistent shrinkage, resulting in warping or bending. The pressure and temperature settings are unreasonable, and the residual stress of the product in the flow direction is too large. It will also cause warpage.
3) Dissatisfaction: The thin part of the product is too thin, which makes the flow stagnate and cannot fill the mold. Or the material's fluidity is not good enough, and the exhaust is not good, which can also cause problems.
4) Black spots or variegated colors: The plastic pellets are contaminated by foreign matter, the on-site 5S management is not in place, screw problems, etc., are likely to cause poor product appearance.