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Injection Moulding The Performance
Jul 07, 2017

Injection molding process needs to control the temperature of the barrel temperature, Injection Moulding nozzle temperature and mold temperature. Injection Moulding The first two kinds of temperature mainly affect the plasticization and flow of plastic, and then a temperature is mainly affecting the flow of plastic and cooling. Each plastic has a different flow temperature, the same kind of plastic, Injection Moulding due to different sources or grades, the flow temperature and decomposition temperature is different, it is due to the average molecular weight and molecular weight distribution caused by different plastic in different types of injection Machine plastic process is also different, Injection Moulding so choose the cylinder temperature is not the same.

The nozzle temperature is usually slightly lower than the maximum temperature of the barrel, which is to prevent the melt in the straight-through nozzle may occur "salivation phenomenon." The nozzle temperature can not be too low, otherwise it will cause the melt of the early solidification of the nozzle block, Injection Moulding or because the early injection into the cavity and affect the performance of products

The mold temperature has a great influence on the intrinsic performance and apparent quality of the product. The temperature of the mold depends on the presence or absence of the crystallinity of the plastic, Injection Moulding the size and structure of the product, the performance requirements, Injection Moulding and other process conditions (melt temperature, injection speed and injection pressure, molding cycle, etc.).

(Back pressure) with screw-type injection machine, the top of the screw in the screw rotation back and forth when the pressure is called plasticization pressure, also known as back pressure. Injection Moulding The size of this pressure can be adjusted by the relief valve in the hydraulic system. In the injection, the size of the plasticizing pressure is the same as the screw speed, Injection Moulding then increase the plasticizing pressure will increase the melt temperature, but will reduce the rate of plasticization.

In addition, increasing the plasticizing pressure often results in a uniform temperature of the melt, uniform mixing of the colorants, and removal of the gas from the melt. Injection Moulding In general operation, the decision of plasticizing pressure should ensure that the quality of products under the premise of the lower the better, Injection Moulding the specific value is used with the variety of plastic varies.

In the current production, the injection pressure of almost all of the injectors is based on the pressure applied by the plunger or the top of the screw to the plastic (converted by the oil pressure). Injection Moulding The effect of injection pressure on injection molding is to overcome the flow resistance of the plastic from the cartridge to the cavity, the rate at which the melt is charged, Injection Moulding and the melt to be compacted. Molding cycle: The molding cycle directly affects labor productivity and equipment utilization. Therefore, Injection Moulding in the production process, should ensure the quality of the premise, as far as possible to shorten the molding cycle of the relevant time. Throughout the molding cycle, the injection time and the cooling time of the most important, Injection Moulding they have a decisive impact on the quality of the product. Injection Moulding The filling time in the injection time is directly proportional to the charge rate, and the filling time in the production is generally about 3-5 seconds.