Push block the top of the push block at the top of the transparent material commonly used products, product surface is not allowed without the use of the push plate signs thimble way ejection. Figure 2-57 shows the block to push the top of the structure diagram, can be learned from the figure, the push block connected together by a screw thimble, push the block to be done outside of the slope. In the top of the push block design takes note of the following points: the push block with high hardness and a smaller surface roughness, and to ensure there is enough strength to push the block, while ensuring low friction during movement of the exhaust trough section size, note pvc plastic, different plastic materials stocks vent groove depth dimension in the mold, depending on the depth dimension of the resin dry and is easy decomposition. Easy decomposition of resin, its exhaust groove area can be larger; low degree of dry material, its exhaust groove depth to be shallower. Table 2-1 lists the exhaust slot size used plastic limb material, the use of exhaust thimble and needle inserts for larger depth dimension ribs, in the injection molding process is often filled with difficulties arise, lack of glue, trapped gas and other phenomena, You can now add a thimble, thimble use gap between the exhaust pvc fence, such as the exhaust thimble may be used in addition to, but also can be split into core or cavity inserts needles assembled in the mold, the use of space to row gas. Polycarbonate month purpose is a non-crystalline engineering materials, with a particularly good impact strength, thermal stability, gloss, flame retardant and stain resistance. Buckle has good mechanical properties, but illiquid, and therefore more difficult injection molding process this material. The viscosity, melt temperature high pvc drains, poor mobility, need relatively high temperature injection molding, melt temperature adjustment range is narrow, technology is better, shrinkage rate of about 0.5, preferably dimensional stability, abrasion resistance and nylon quite, and a certain corrosion resistance. Hygroscopic materials, processing needs drying, recommended drying conditions. Hours. A melting temperature of a mold temperature of 260. It has been used as a variety of gears, worm gear, pump impeller, shade, container, housing and cover other parts. pvc wall panel, Gary trade (certification), provided by the Shenzhen Luohu pvc Gary Trading Limited. Gary Trade Co., Ltd. of Shenzhen City (www.pft-trading.com) is Shenzhen, a leader in engineering plastics for many years, the company implement the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Gary trade in leadership with the staff warmly welcome all inquiries negotiations to create a better future for Gary trade.