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[Chemical Knowledge]：The Importance and Function of Pressure Preservation of Injection Molding Machine

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As a common equipment in modern industry, injection molding machine is widely used in electronics, home appliances, automobiles, daily necessities and other industries. Holding pressure is an indispensable part of the injection molding process. The purpose of

holding pressure is to compensate for the defects caused by the cooling shrinkage of the melt and the drop of the melt temperature, and at the same time to ensure the longitudinal and transverse consistency of the product. The process of holding pressure is to keep the pressure of the injection molding machine for a period of time immediately after injection molding, so that the plastic material can be partially melted by the interaction of pressure and temperature to ensure the quality and performance of injection molding.

So, what is the role of injection molding machine holding pressure?

1. Solve the problem of shrinkage and burrs

injection molding pressure can effectively solve the melt cooling shrinkage, and melt temperature drop caused by the shrinkage problem. When the pressure is released after injection molding, the melt will shrink, easily leaving shrinkage or burrs at the corners of the molded product. By holding pressure, the injection molding machine can maintain a good pressure state and prevent product defects.

2. Improve the firmness of the product

the pressure holding of the injection molding machine can make the plastic material be well filled into every corner and blind hole of the injection mold. When the melt is compacted, the molecules of the plastic are more tightly packed, which makes the product stronger and more durable, while also increasing the density of the product.

3. Improve the molding accuracy of the product

In the process of holding pressure in the injection molding machine, the plasticity of the melt is increased. This allows the plastic material to fill the injection mold more completely, so it can effectively improve the molding accuracy of the product. How does the

effectively maintain the pressure?

1. By adjusting the pressure of the injection molding machine, the

can effectively control the flow rate of the melt and fill the melt into every corner and blind hole of the mold.

2.
the
holding time by controlling the time is closely related to the molding quality of the product. If the holding time is too long, it will cause the transition melting of the plastic material, and if the time is too short, the mold cannot be fully filled, which will affect the firmness and accuracy of the product.

3.

by adjusting the ratio of holding pressure to time For different types of products, it is necessary to adjust the ratio of holding pressure to time to achieve the best holding effect.

injection molding machine holding pressure is an indispensable part of the injection molding process. By adjusting the holding pressure parameters scientifically and reasonably, the firmness and forming accuracy of the product can be improved, thereby ensuring the quality and performance of the product.