Causes and solutions generated by a black dot) feeding tube so that the melt temperature is set too high, the decomposition of overheating, you should check whether the cylinder temperature controller runaway Shenzhen double injection, and appropriate to reduce the temperature of the cylinder. 2) melt remaining in the barrel exploded cause localized overheating, you should check the barrel, nozzle and screw prevent countless dead ends hoppers return valve and repaired 3) melt with the barrel wall friction overheated melt decomposition, this should be adjusted to the screw and barrel gap. Avoid excessive shear force, the gate is too small or too fast injection 4) the residual gas in the mold due to adiabatic compression and cause a fire. Make melt overheating decomposition. This may be appropriate to reduce the injection speed and improve the structure of the exhaust port of the mold. Injection molding should be noted: (1) the cylinder temperature is too high, a large volume change color injection molds, especially in the first two-color injection molding oven temperature of illiquid plastic should increase the temperature to ensure smooth. (2) injection pressure, speed, back pressure is too low, the injection molding time is too short, so that the quantity or insufficient density systolic pressure, speed, back pressure is too large, too long and the resulting burrs and contraction. (3) the feed amount that is consumed cushion injection pressure is too large, too small, insufficient quantity. (4) is not required for precision parts, the injection pressure holding is completed, the outer part of the basic condensation curing the sandwich is still soft, but also ejection of the workpiece, as soon as possible out of the mold and allowed to cool slowly in air or hot water can make depression gentle contraction rather inconspicuous and do not affect the use of NA me. Double Injection Factory | Double Injection | Hengxin multicolor multicolor by Karen Xin Technology Limited. Karen multicolor Xin Technology Co., Ltd. (www.szhxds.cn) strong, credible, in Shenzhen, Guangdong plastic mold industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving Hengxin innovative ideas will lead into the brilliant multi-colored and you work for a better future!