Do you know the use of back pressure in the injection molding process?


Author: MULAN -Plastic Molding Manufacturer

In the process of mold injection molding, it is often difficult to solve the problem of shrinkage of a certain part of the product. In this case, it is only possible to properly tune the backpressure parameters using backpressure. Injection mold processing manufacturers introduced the reason for using back pressure: when the screw rotates, the plasticized plastic is pushed forward under the action of the screw, and reaches the front end of the screw through the stop valve.

As the melt advances, a melt is produced. The reaction force acts on the screw and the check valve, causing the screw to move backwards, pushing more melt forward. At this time, if the back pressure is adjusted, a certain pressure in the cylinder will act on the screw from the back to the front.

, to provide resistance for the screw to retreat. The greater the back pressure, the longer the screw reset time. The pressure generated by the melt at the front of the screw must be greater than the back pressure to make the screw retreat.

It must be pointed out that not all injection molding must use back pressure, but if it is used, the plastic can be fully melted and mixed evenly. There are more advantages to using back pressure in the injection molding process: 1. It is conducive to the discharge of volatile gases in the melt. 2. Additives and melt are mixed more evenly.

3. Make the plasticization more uniform. The above content is an introduction to the use of back pressure in the injection molding process by injection mold processing manufacturers. I believe that everyone has further study and understanding.

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