Shunt definition refers to the main road from the beginning to the end part of the gate after the premises, runner's role is to melt the plastic smooth and orderly introduction of each cavity. Figure 2-5 is a common outlet around the injection system big shunt. When there are multiple cavity mold, the runner will be divided into first and second runner runner. Flow cross-section in the form of channel-section runner common round and trapezoid. Among them, the circular cross-section is mainly used for large outlet mold pp plastic material, and a trapezoidal cross-section is mainly used for fine nozzle mold. Reference circular cross-section flow channel: Figure 2-6 shows a circular cross-section channel, which is usually an even cross-sectional size, cross-sectional size can be determined according to the size of the product, the greater the pet plastic material products, the desired inflow of molten The more plastic. In order to fill the cavity in a short time to ensure, a relatively large size can be used, if the article is small, a small cross-sectional dimension. Advantage of circular cross-section flow channel is the ratio of the area of ??the smallest surface area and cut, the molten plastic flows into the friction when the minimum, slow cooling, can reduce the loss of the melting temperature, maintaining of pressure balance, easy processing. Trapezoidal cross-section flow channel: for the mouth of the commonly used small water trapezoidal cross-section flow channel, the advantages of trapezoidal cross-section is easy to process, the disadvantage is melted plastic in the flow path will lose more heat. Parameter setting sprue and runner between the main channel in the front runner, the different sizes of different flow path between the two. Shows the relationship between the main channel and a large outlet diversion channel. As can be understood from the figure, the largest size 0, followed by ⑴, Bom, confused, runner diameter is generally 0.750, each runner was 0.75 times lower the higher the flow channel. Fine for common outlet flow channel parameters, can be seen on the relationship between the lower runner for 0.75 times. Pouring into the gate is the last link in the system, the gate is directly connected with the mold cavity, size, form and position of the gate size required is determined according to the article shape, appearance and size. Direct-gate apply to exterior surfaces and allowed to gate remain shallow and flat products, due to shrinkage, stress and other reasons, easily lead to warpage. Rectangular side gate rectangular mold outlet side gate is large the most used way. Shows a typical side gate. Advantages: simple shapes side gate, ease of processing pvc plastic material, easy to remove the gate. Disadvantages: The products will leave the side of the gate marks, products and the gate can not be automatically separated. For different plastic materials, the relevant parameters are not the same gate. In the design process, the user requires a combination of materials, the mold size, and position of the flow and other factors considered. Plastic materials table, Xixiang plastic materials, provided by the Shenzhen Municipal Trade Gary Paffett Trading Limited. Shenzhen Gary Ltd. (www.pft-trading.com) strong, credible, in Shenzhen, Guangdong engineering plastics industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Paffett trade and you hand into the brilliant, for a better future!