Technology and techniques to solve the problem of deformation of flat injection molded parts

To completely solve the problem of deformation of large flat injection molded parts is indeed a difficult problem, in production we have summarized some more effective measures to improve the problem of deformation.
　　I. Change the mold into a multi-point entry (usually three plates mold), 24 amp machine above the large plane injection molded parts better to reach more than 4 points. This can reduce the degree of molecular orientation arrangement and reduce the gap of inconsistent shrinkage in all directions.
　　II. Properly increase the mold temperature, ABS material is usually kept above 60 ℃, in order to reduce the cooling rate of the injection molded parts, reduce the temperature difference deformation caused by the transition of the cooling, and can reduce the degree of molecular orientation.
　　Three. The most important one is to increase the injection or holding pressure, and greatly extend the injection or holding time, so that the size of the injection molded part will increase, reduce its shrinkage, and the degree of deformation will be significantly improved. Therefore, extending the injection or holding time (such as extending 10 to 15 seconds) has become an important tool to solve the deformation problem.
　　IV. If the above three measures have not achieved the desired effect, the only way to take out of the mold to set. Because the general use is not very good, so a little skill is needed.
　　First of all, the injection molded parts should be taken out of the mold early, and then take advantage of the fact that they are still in the state of several tens of degrees high temperature (should still be very hot, this is very critical), and put them on the workbench with the fixture to set the shape, the key is the design of the fixture needs to be suitable. At the same time, we should also consider the rebound degree of the injection molded parts, usually 12 hours after the rebound will basically stop, and the lower the temperature out of the mold, the greater the rebound amount. As the saying goes, the overkill must be corrected, so the amount of overpressure should be studied during production.
　　The last thing to emphasize is that we must pay attention to the packaging and placement of injection molded parts. This is really important, otherwise all our efforts will be ruined. Generally speaking, the injection parts can be packed sideways, but of course, the form of placement should be decided according to the shape of the injection parts. In short, we should not let the injection molded parts squeeze each other, nor should we let a part of the injection molded parts overhang, otherwise the injection molded parts will start to deform after a few days.