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Secrets Of Injection Molding Process Adjustment
Original: Original | Author: DGMF Mold Clamps | Publish Time: 2020-09-09 | 5819 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.

 

High pressure will damage the material and cause surface defects such as flow marks and scorched water inlet. This situation can be overcome by decelerating just before the water inlet. This deceleration can prevent Stop the excessive shear at the water inlet, and then increase the rate of fire to the original value. Because it is very difficult to precisely control the rate of fire to slow down at the water inlet, it is a better plan to slow down at the end of the runner.

 

We can avoid or reduce defects such as flash, scorch, trapped air, etc. by controlling the injection speed at the end. The deceleration at the end of the filling can prevent overfilling of the cavity, avoid flash, and reduce residual stress. Air traps caused by poor exhaust or filling problems at the end of the mold flow path can also be solved by reducing the exhaust speed, especially the exhaust speed at the end of the injection.

The short shot is caused by the slow speed at the water inlet or the blockage of local flow caused by the solidification of the melt. This problem can be solved by increasing the injection speed just after passing the water inlet or local flow obstruction.