wholesale injection mold machine for platic box manufacturer,supplier,factory for sale

September 29,2021

Everyone must be very familiar with plastic boxes. The biggest purpose of plastic boxes is storage. The takeout we often order is also packed in plastic boxes. we may know that the plastic boxes are made by the injection mold machine for plastic box. However, there are some precautions when operating the injection mold machine for plastic box.



Some precautions for injection molding machine for plastic box

Technical considerations

Control of temperature

The temperature to be controlled in the molding process includes barrel temperature, nozzle temperature and mold temperature. The first two temperatures mainly affect the plasticization and flow of plastics, and the third temperature mainly affects the flow and cooling of plastics.


Barrel temperature

Each kind of 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 machines is also different, so the barrel temperature is also different.


Nozzle temperature

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.


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, speed and pressure, molding cycle, etc.).


Control of pressure

The pressure in the injection molding process includes plasticizing pressure and pressure, which directly affects the plasticization of plastics and the quality of products.


Plasticizing pressure

It is also called back pressure. This pressure can be adjusted by the overflow valve in the hydraulic system. The plasticizing pressure needs to be changed with the screw design, product quality requirements and different types of plastics. If these conditions and the screw speed remain unchanged, increasing the plasticizing pressure will strengthen the shear effect, that is, it will increase the melt temperature, but it will reduce the plasticizing efficiency, increase the countercurrent and leakage flow and increase the driving power.



In the current production, the pressure of almost all injection molding machines is form the top of the plunger or screw to the plastic. The role of pressure in injection molding is to overcome the flow resistance of plastic from the barrel to the cavity, give the melt filling rate and compact the melt.


Financial Considerations

Entry cost

Products manufactured by injection molding technology require a large initial investment. Make sure you know this key point in advance.


Production quantity

  • Determine the number of parts produced when injection molding becomes the most cost-effective manufacturing method,
  • Determine the number of parts you want to break even on your investment (considering the costs of design, testing, production, assembly, marketing and distribution and the expected price point of sales). Establish a conservative margin.


In summary

Injection molding is a great technology in mass production. But that is also why we need to pay more attention when we use it. Once there is a small problem, it will cause huge loss. These considerations are not only for injection molding machine for plastic box, they are suitable for other injection molding machine.


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