Cooling in the mold, cooled in different ways, the most common is by water cooling. In addition, can also be cooled by the heat plate or the like. Typically, the heat transfer medium is water and oil. Design principles are described below mold cooling water of the most widely used in the cooling water, the first to introduce the precautions waterway design. Tips from the edge of the cavity is larger than the outer diameter of the waterway 1,001,111 is not to say the bigger the better. What usually pp plastic, water farther away from the cavity, the cooling effect is worse, if too close to the flame retardant masterbatch pp, mold strength and can not guarantee that end, the distance control between 10-20 is more reasonable. The length of the back pin spring is determined by the following factors. Outside diameter selection principles: 20,25,30,35,40,50,60, free length need standardization, not because of the length of the shear carried out. Spring preload amount: General requirements for the spring free length, use a smaller diameter larger spring preload than the smaller diameter of the spring preload and use a larger ratio. Compression ratio: compression ratio is free length, generally require compression ratio below 40 pp, the compression ratio is smaller, the longer the life of the spring. When the two spring guide rod pick up the need to use as a guide, the spring guide rod diameters less than the inner diameter of a mesh, spring to avoid empty two spring diameter size distribution requirements as ten 2.0 spring symmetry pp fittings, springs and installation Mounting dimensions. The first way is to needle spring housing on the back, to be processed in an aperture plate 8, the height between the pore diameter equal to the diameter of ten spring 2, an inner diameter equal to the return spring ten 2 meter diameter. The second way is processed directly in the ejector plate and 8 plates out spring disposed apertures, the spring is mounted on the hole. pp bags | Gary trade (certified) | Shenzhen pp provided by the Shenzhen Municipal Trade Co., Gary. Shenzhen Gary Ltd. (www.pft-trading.com) Guangdong Shenzhen, a leader in engineering plastics, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Gary leadership in trade with the staff warmly welcome all inquiries negotiations to create a better future for Gary trade.