Back pressure back pressure refers to the screw reverse the accumulator back pressure to overcome. High back pressure in favor of the pigment dispersion and plastic melts, but at the same time extending the screw retraction time office supplies high-quality suppliers and reduce the length of the plastic fibers Baoan office supplies housing providers, increasing the pressure on the injection molding machine, so back pressure should be low, generally less than 20% of the injection pressure. Foam injection molding, the back pressure should be less than the gas pressure in the formation of high office supplies processors, otherwise the screw will be launched barrel. Some back-pressure injection molding machine can be programmed to screw length compensation during the melting down, this will reduce heat input, allowing the temperature to drop. However, as a result of this change is difficult to estimate, it is difficult for the machine to be adjusted accordingly. Cooling phase in the injection molding die design of the cooling system is very important. This is because the molded plastic only cooled and solidified to a certain rigidity office supplies, after the release in order to avoid plastic deformation by external force due. Since the total molding cycle cooling time from about 70% to 80%, so well-designed cooling system can significantly shorten the molding time and increase injection productivity and reduce costs. Poorly designed cooling system will lengthen the molding time and increase costs; more will be further cause uneven cooling warpage of plastic products. According to experiments, the heat from the melt into the mold in two parts substantially circulated, a portion of 5% by radiation, convection pass into the atmosphere, and the remaining 95% from the melt into the mold conduction. Plastic in the mold due to cooling water pipes, heat from the mold cavity plastic mold spread by thermal conduction through the cooling water pipe, and then was taken away by thermal convection cooling liquid. Few are not the cooling water continues to heat conduction in the mold until after contact with the outside world escapes to the air. Shell processing office supplies | office supplies | integration into a plastic mold factory from Shenzhen harmony Technology Limited. Shenzhen harmony Technology Limited (www.rhctech.net) strong, credible, in Shenzhen of plastic products industry has accumulated a large number of loyal customers. The company better work attitude and continuous improvement will lead the integration of innovative ideas into a plastic mold manufacturers and you hand in hand into the brilliant, for a better future!