The plastic parts will be coated on the punch due to shortening effect during cooling. Therefore, from the perspective of demoulding of the plastic parts processed by the Table Mould(FURNITUREMOULD), it should be beneficial for the plastic parts to stay on one side of the movable mould so as to facilitate demoulding. And does not affect the quantity, appearance and shape of the plastic parts and the dimensional accuracy. The gating system usually consists of four parts: main runner, branch runner, gate and cold material cavity. The planning of gating system should ensure the smooth movement of the melt of the plastic parts processed by the table mould, the process should be as short as possible, the core deformation should be avoided, the renovation should be convenient, the deformation and warping of the finished products should be avoided, it should be applicable to the types of plastic parts data, the cold material cavity planning should be reasonable, and the plastic consumption should be reduced as much as possible. The section thickness of the plastic part is relatively small, so it is not suitable to use push rod to push out, but it is more suitable to use push plate to push out. Therefore, it is not suitable to set up cold material holes, so the material pulling rod adopts the ball fastening method. Does not affect the appearance quality of plastic parts, according to the above parting surface, shunt should choose a circular cross-section, choose gate sleeve on the fixed die plate. Nowadays, the technology of plastic injection moulding is quite mature, and more and more enterprises are engaged in plastic injection moulding. However, plastic injection moulding is quite complicated, and there will still be some minor problems. Shrinkage of plastic injection moulding surface is pit-shaped on the surface of plastic shell, which usually occurs in the thick part with large volume shrinkage. During the cooling process of the plastic shell, the volume shrinks, thus causing the pulling force to shrink inward. At this time, it is affected by the balance between the rigidity of the surface cold material layer and the shrinkage force of the resin. When the cold material layer is weak, a pulling force occurs to the middle part of the plastic shell, which appears concave on the surface of the product. When the cold material layer is strong, vacuum bubbles will be generated in the middle part of the plastic shell. In areas with thicker meat thickness, the balance between the rigidity of the surface layer of the cold material and the shrinkage force of the resin is closely related to the cooling speed of the plastic shell surface, and vacuum bubbles are formed when the cooling speed is faster. On the contrary, shrinkage occurs at a slower rate. In addition, the cooling speed becomes slower, the volume shrinkage difference will become smaller, and the shrinkage condition will also become smaller. If you are interested in our products, you can click Dustbin Mould to learn more information.
