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What Is Plastic Injection-03

Time: 2021-08-25 hits: 3

The injection molding process can be roughly divided into the following six stages:

 

Mold closing, plástico injection, pressure maintaining, cooling, mold opening and product taking out.

 

If the above process is repeated, the products can be produced in batch and periodically. The molding of thermosetting plastics and rubber also includes the same process, but the barrel temperature is lower than that of thermoplastic plastics, the injection pressure is higher, and the mold is heated. After the injection of materials, it needs to go through the curing or vulcanization process in the mold, and then take off the film while it is hot.

 

 

1. Controle de temperatura

 

a. Barrel temperature: the temperature to be controlled in the injection molding process includes barrel temperature, nozzle temperature and mold temperature. The first two temperatures mainly affect the plasticization and flow of plastics, and the second temperature mainly affects the flow and cooling of plastics. Each plastic has different flow temperature.

 

For the same plastic, due to different sources or brands, its flow temperature and decomposition temperature are different, which is due to different average molecular weight and molecular weight distribution.

 

The plasticization process of plastics in different types of injection machines is also different, so the barrel temperature is also different.

 

b. Temperatura do bico: the nozzle temperature is usually slightly lower than the maximum temperature of the barrel, which is to prevent the "salivation" of molten material in the straight through nozzle. The nozzle temperature should not be too low, otherwise it will cause the early setting of molten material and block the nozzle, or affect the performance of the product due to the injection of early setting material into the mold cavity.

 

c. Mold temperature: mold temperature has a great impact on the internal performance and apparent quality of products. The mold temperature depends on the crystallinity of the plastic, the size and structure of the product, performance requirements, and other process conditions (melt temperature, injection speed, injection pressure, molding cycle, etc.).