Note that the top of the push plate is not suitable for all types of mold in the mold of the need for the push plate to the top of the structural design of the push plate. Basics mold structure fixed using spacers push block and push plate to push the top of the top of the board design to apply to the barrel, thin-walled, transparent, does not allow thimble traces of plastic products. Push the top of the board has the advantage of a uniform force, products not easily deformed pvc, the disadvantage is pushing plate processing difficulties, does not apply to sub-surface complex parts. Push block the top of the push block at the top of the transparent material commonly used products pvc stabilizer, the product surface and not allowed to have thimble trace mode using the push plate 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 air-permeable steel row gas permeable sintered alloy steel is a steel pipe pvc, is sintered alloy material with spherical particles, its poor strength, but the texture is loose pvc plastic bags, allowing the gas to pass. The need to place a portion of the exhaust of such alloys, can achieve the purpose of exhaust. But the bottom vent hole diameter should not be too large, in order to prevent its extrusion cavity pressure. Due to the low thermal conductivity breathable steel, so that it can not be overheated, otherwise prone to decomposition clogged pores. pvc stabilizer _ Longhua District pvc_ Gary trade provided by the Shenzhen Municipal Trade Co., Gary. Gary Trade Co., Ltd. of Shenzhen City (www.pft-trading.com) strong, credible, Shenzhen in Guangdong's plastics industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Parfitt trade into the brilliant and you work for a better future!