Use breathable steel exhaust ventilation is a sintered alloy steel pvc market, are spherical particles sintered alloy material with poor strength, but the texture is loose, 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. Basics mold parting surface structure rectangular tube Positioner pvc, shown is a common sub-surface positioning device, commonly used in medium-sized mold, pipe-bit blocks and templates from the minimum side dish, the need to ensure adequate strength. Pipe-bit block can create their own or purchase standard parts, and its size can be selected according to the mold size and strength requirements. The mold cavity and core positioning. In addition to forming part of the mold parts need to locate outside pvc ink, inserts and thimble, also need to be positioned. Insert location, the most common way to insert is positioned at the bottom of the processing to a new level, by the step fixed on the template. Height of the steps taken pvc labels, inserts small steps you can take smaller size, higher strength requirements of large inserts, relatively speaking, can take bigger height, the specific size depending on the actual situation. Between the step and the template need to stay to avoid empty location, purpose is to facilitate disassembly. (It) is the length of the insert positioning steps designed to insert the same length, but may be changed according to the needs of its length. As shown in Figure 2-76, insert length dimension is 10, the positioning step length is 6. pvc Quote | Zhanjiang 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!