What do you mean by plastic mold injection molding? What's the use?
Bao subsection to the holding pressure and holding time, at the time of injection molding, about 1-2 seconds can not the mould cavity while curing fill, and then the molten plastic cooling in the mold, the volume will narrow. So after injection molding for 1 to 2 seconds, you set the pressure time and pressure pressure to continue to press the plastic into the mold, and time is the time
According to the contraction and cooling effect. If the workpiece after the mold shrinkage will increase the holding time, if the workpiece after the mold is soft, finalize the design is not good, also want to try to increase the pressure maintaining and cooling time in injection molding process, the solution for cooling and contraction, but due to the screw to continue to move forward slowly, make the pipe material in the melt to continue into the cavity, to supplement the need of product shrinkage, called pressure. Ie, to prevent the product shrinkage, use pressure production is stable. The holding also can adjust the size of the product size, and there will be no weld lines, sag, flash and buckling deformation.
The assurance means a fixed pressure on the material in the mold. Because the plastic in the cooling process has the effect of heat bilges cold shrink, especially larger plastic shrinkage, heat bilges cold shrink is very obvious, so when we give the material after a fixed pressure, plastic shrinkage during the cooling process, the mold melt pressure began to decline, with the holding role, and the hydraulic system will automatically forward pressure, progress in the back of the material, added the contraction of the melt front, thus forming prevent products caused by shrinkage deformation. Adjust the pressure of pressure and the time of holding pressure, adjust the product defects such as the flying side, fuse connection and shrinkage mark.
