Why do plastic mold products warp and distort? How can I solve the problem of injection molded products warping?

Why do plastic mold products warp and distort? How can I solve the problem of injection molded products warping?

Plastic mold injection molded products deformation, bending, twisting phenomenon occurs mainly due to the plastic molding flow direction of the shrinkage rate than the vertical direction of the large, so that the parts in all directions of the acceptance rate is different, warping due to the injection of the injection mold filling inevitably in the parts of the interior of the residue of the larger internal stress caused by the warping, the following is Ideal Vowin Group plastic mold manufacturers editor compilation of plastic mold injection molded products warping the reasons for and the solution to the problem.

 

1、Insufficient or uneven cooling

Top out in the incomplete cooling, the top bar of the top thrust tends to deform the molded parts, so not fully cooled on the forced demolding will produce deformation. The solution is to fully cool in the mold cavity, such as fully hardened before ejecting. Can also reduce the mold temperature, extend the cooling time.

 

2、caused by molding strain

The deformation caused by molding strain is mainly caused by the molding contraction in the direction of the difference between the wall thickness changes. Therefore, increase the mold temperature, increase the melt temperature, reduce the injection pressure, improve the flow conditions of the pouring system can reduce the shrinkage in the direction of the difference.
 

 

3、caused by the top bar

Some parts of the mold release is bad, the use of the top bar to force the deformation caused by the mold. Not easy to deform the plastic parts, this is not a deformation but cracks, in addition to the method is to improve the polishing of the mold, so that it is easy to demold, and sometimes the use of mold release agent can also improve the demolding.

 

4、Methods to correct product warpage

From the mold out of the product if you want to correct, the simple way to correct the product to be placed on the corrective tools, in the warped place plus weight, but must clearly decide the weight of the weight and the location of the placed. Or put the warped products on the straightening tool, together with the products into the heat deformation temperature similar to the hot water, simply straighten by hand. But be careful that the temperature of the hot water should not be too high, otherwise it will make the product's deformation more serious.

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