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Secrets Of Injection Molding Process Adjustment
Original: Original | Author: DGMF Mold Clamps | Publish Time: 2020-09-09 | 5817 Views | Share:
Although the computer-controlled injection speed segmented control system has long existed, the advantages of this machine sets are rarely used due to the limited information. This article will systematically explain the advantages of applying multi-speed injection molding, and briefly introduce its use in eliminating short shots, trapped air, shrinkage, and other product defects.

3) The injection speed setting should take into account that the critical area (such as the runner) is filled quickly while slowing down at the water inlet.

4) The injection speed should be guaranteed to stop immediately after the cavity is filled to prevent overfilling, flashing, and residual stress.

 

The basis for setting the speed segmentation must take into account the geometry of the mold, other flow restrictions, and unstable factors. The speed setting must have a clear understanding of the injection molding process and material knowledge, otherwise, the product quality will be difficult to control. Because the melt flow rate is difficult to directly measure, it can be calculated indirectly by measuring the screw forward speed or cavity pressure (make sure that the check valve is not leaking).

 

Material characteristics are very important, because polymers may degrade due to different stresses. Increasing the molding temperature may lead to severe oxidation and degradation of chemical structure, but at the same time, the degradation caused by shear becomes smaller, because high temperature reduces the viscosity of the material. Reduced shear stress. Undoubtedly, the multi-stage glue injection speed is very helpful for forming heat-sensitive materials such as PC, POM, UPVC, and their blending ingredients.