Nozzle temperature and pressure control for injection molding processing of cosmetic packaging material hose
The temperature that needs to be controlled in the process of injection molding of cosmetic packaging material hose includes barrel temperature, nozzle temperature and mold temperature. During operation, the first two temperatures mainly affect the plasticization and activity of plastics, and the other temperature mainly affects plastics. Activity and cooling. Every kind of plastic has different activity temperature. The same kind of plastic has different activity temperature and differentiation temperature because of different origins or trademarks. This is due to the difference in average molecular weight and molecular weight distribution. Therefore, in the production of sports cosmetics Packaging material hose, plastic water cup, cosmetic plastic, material bottle, daily-use bottle, bottle cap, food packaging cosmetic packaging material hose, cosmetics packaging material hose, health care plastic bottle, medicinal cosmetic packaging material hose, beverage bottle Life cosmetics packaging material hose, juice machine, bottle body, children’s toys, various pigments, cosmetic packaging material, hoses, various heterogeneous plastic products, industrial plastic products, and other types of products. The plasticization process in different types of injection machines is also different, so choose the material The cylinder temperature is also different.
Nozzle temperature for injection molding of cosmetic packaging material hose
The nozzle temperature of the injection molding process is usually slightly lower than the barrel temperature. This is to prevent the possible'salting phenomenon' of the melt in the straight-through nozzle. The temperature of the nozzle should not be too low, otherwise the nozzle will be blocked due to the formation of early solidification of the melt, or the function of the product will be affected due to the injection of the early solidification material into the cavity.
Mold temperature for injection molding
Mold temperature has a great influence on the inner function and apparent quality of the product. The unevenness of the mold temperature is determined by the crystallinity of the plastic, the size and structure of the product, the functional requirements, and other process conditions (melt temperature, injection speed and injection pressure, molding cycle, etc.).
Pressure control for injection molding
The pressure in the injection molding process includes plasticizing pressure and injection pressure, and directly affects the plasticization of plastics and product quality.
When the injection molding process of cosmetic packaging material hose is operated with a screw injection machine, the pressure on the top of the screw when the screw is rolled and retracted is called the plasticizing pressure, also known as the back pressure. The size of this pressure can be adjusted through the relief valve in the hydraulic system. In the injection, the size of the plasticizing pressure is changed with the planning of the screw, the requirements of the product quality, and the variety of plastics. If these conditions and the speed of the screw are the same, adding the plasticizing pressure will strengthen the shearing. The effect is that the temperature of the melt will be increased, but the efficiency of plasticization will be reduced, countercurrent and leakage current will be increased, and driving power will be added.
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