Holding pressure and time near the end of the injection molding process, the screw stops rotating, just forward of quality plastic products, plastic injection into the packing stage at this time. Packing process in the injection molding machine nozzle continuously fed into the cavity plastic products factory, to fill the vacated due workpiece volume contraction. Without packing plastic, large parts dating shrink about 25% if the cavity is filled, in particular due to the contraction of the muscle is too large and the formation of shrink marks. Holding pressure is generally about 85% of the maximum pressure filled, of course, be determined according to the actual situation. Mold shrinkage should be designed according to the specification of the range of all kinds of plastic provided, according to plastic parts shape, size, wall thickness, with or without the insert, the sub-surface and the direction of the press molding, the mold structure and inlet form size and position, forming process and other various factors to be considered in selecting shrinkage values. For when extrusion or injection molding of plastic parts is often basis having the shape, size, thickness and other characteristics of each site to select different shrinkage. In addition, shrinkage is affected by various molding forming factors, but mainly on the plastic variety, shape and size of plastic parts. The adjustment of molding the molding conditions can also change the contraction of plastic parts properly. Plastic Processing Which is better _ integration into a plastic mold factory (certification) _ Plastic harmony by the Shenzhen Municipal Technology Limited. Shenzhen harmony Technology Limited (www.rhctech.net) Guangdong Shenzhen, plastic products leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. The integration into a plastic mold factory leadership with the staff warmly welcome all inquiries negotiations to create harmony into a plastic mold manufacturers a better future.