Optical injection mold from China introduces injection-compression molding
Release time:
2023-02-09 15:19
Source:
Optical injection mold from China tells you that conventional injection-compression molding, compared to standard injection molding, injection-compression molding allows the flow path/wall thickness ratio of the mold to be as high as 500:1. Optical injection mold from China tells you that it is important that there are no conversion flow marks on the surface of the optic. Therefore each individual process and movement in a cycle must be continuous.
Optical injection mold from China tells you that during the filling phase, the mold is only opened a little. The gap size corresponds to the value of the compression stroke. Once the plastic melt has been injected into the mold, the compression process begins as a function of the screw position. Since the mold is open, its internal pressure is reduced or even completely eliminated during the injection molding process. The compression phase is initiated by a position-adjustable screw. Before the cavity is completely filled, the plastic melt flows along the end of the flow path and is compressed by the subsequent compression stage, which also compensates for the shrinkage of the plastic.
Optical injection mold from China tells you that if the cavity is filled at the end of the filling stage, the compression stage starts directly. With some machine settings, the plastic melt can also be pressed back into the plasticizing unit at this stage in the opposite direction of the screw pressure. In this way, parts with high requirements for weld lines can be produced without weld lines or selectively transferred to the edge area of the part (prisms with a wall thickness ratio SA/SI ≥ 3, such as concave mirrors or negative meniscus scattering lenses ).
Through the above introduction and analysis of the Optical injection mold from China, hope it helps you.
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