1. Combustion is generally caused by insufficient exhaust. It is recommended to start the exhaust from the burnt place first. 2. Control the amount of glue, and the injection speed will slow down near the paste. Then keep up with calendering for about 0.5 seconds. It can solve the combustion problem well. 3. That is slow-fast-slow. You can also use fast-slow. Anyway, just slow down near the burning place. The burning position should be opposite to the position of the gate and weld. This is caused by typical poor exhaust. The solutions are: 1, reduce the injection speed and let the gas in the mold cavity be eliminated in time; 2. Reduce the barrel temperature or set cooling to reduce the material temperature before storage; 3, under the condition of ensuring that the product is not short of materials and does not shrink, the length of molten glue is reduced; If all the above methods fail, we can only modify the mold and add an exhaust duct at the burned position. Where is the price of recycled asphalt in Tangshan high? Tianshun Asphalt Recycling Co., Ltd. recycles a lot of asphalt, recycling asphalt around Tangshan all the year round, recycling waste chemical raw materials that are not used for process improvement in mixing stations, asphalt depots and major enterprises. Hebei environmental protection was approved today. For our special approval of environmental protection, please recycle a large amount of residual asphalt from the mixing station by Recycling Co., Ltd.. In Li Ting, all major chemical plants have a backlog of discarded raw materials and recycle them at high prices. In order not to waste our resources, our environment will not be polluted at all, and our China will be bluer, greener and whiter. Let the hospital create a beautiful China for our future generations. Tianshun Chemical Recycling Co., Ltd. invested 20 17 to recycle chemical waste, and spent a lot of money just to have a beautiful home for our future generations. The recycling hotline welcomes major enterprises to come to the plastic parts to change color locally, in large pieces or even as a whole, and sometimes some parts are mixed with linear or granular brown-black coking substances. The reason is that plastics or flame retardants, ultraviolet absorbers and antistatic agents are added. Overheating and decomposing in the barrel, or decomposing and coking after staying in the barrel for too long, and then forming together with the molten material injected into the cavity. A considerable part of coking is formed by local high temperature produced during injection molding.
(1) Due to the failure or damage of thermocouple, temperature control system and heating system, the barrel temperature is out of balance, resulting in system failure or damage, local overheating of the barrel, or the material stays in the high-temperature barrel for too long in a long injection cycle.
(2) The plunger, the shunt shuttle and the screw are damaged and defective, the nozzle is not well matched with the inlet of the main channel jacket of the mold, there is a big gap between the plunger or the screw and the barrel, and the internal thread connection part of the barrel is loose, which makes the melt stuck and accumulated, and decomposes after heating for a long time.
(3) The metal foreign matter gets stuck in the screw groove or the front of the barrel, and the plastic turns black after continuous grinding.
(4) Some plastics, such as ABS, are cross-linked and coked by high heat in the barrel, but it is difficult to melt under the condition of almost maintaining the original particle shape, and they are crushed by screws or plungers and carried into parts.