Features 1. injection flaws can be easily molded parts in a transparent "air trap" to see but can also occur in opaque plastic. This is related to the thickness, and often leave due to plastic shrinkage caused by injection center. 2. The problem may be due to (1) Mold is not fully populated. (2) The stop valve is not functioning properly. (3) The plastic is not completely dry. (4) Pre-injection molding or too fast. (5) Some special materials applications special equipment. Nozzle hole design is equally important for the success of the second injection. Runner length and the thickness ratio is the main factor affecting the adhesion effect. According to the experience of injection molding factory, the ratio should not exceed 150: 1, the ratio should be maintained at 80 to develop new process design: 1 or so. Figure 2 shows the flow path length and thickness proportional relationship. In order to minimize the rapid injection molding process, nozzle hole in the wall thickness should be set to the maximum position. When using TPE resin, pay attention to the size of the nozzle aperture. TPU and other materials required large-diameter nozzle to accommodate higher viscosity bubble injection molding, to prevent the occurrence of excessive shear material degradation. SEBS and other materials require higher shear rate to obtain optimal flow rate. A better approach is to use a small caliber nozzle at the initial stage, the initial sample and then adjust the nozzle size. Like with the nozzle orifice, the outlet is an important factor affecting the bonding effect of injection molding, how to control the air margin is a major problem, if not properly managed, it is not strong bonding, filling burr may occur. Depth of the outlet is critical to prevent flash, depending on the viscosity of the coating material, the depth of the outlet should be between 0.0005-0.001 inches. Injection molding technology _ Hengxin multicolor (certified) _ injection molding provided by Karen multicolor Xin Technology Limited. Karen multicolor Xin Technology Co., Ltd. (www.szhxds.cn) Guangdong Shenzhen, plastic mold leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In Hengxin multicolor led the staff warmly welcome all inquiries negotiations to create a better future Hengxin multicolor.