How to avoid the shrinkage mark in Injection mold construction processing?
Release time:
2023-02-11
How to avoid the shrinkage mark in Injection mold construction processing? The shrinkage at the thicker part of the two-color Injection mold construction, such as rib or protuberance, is more serious than that at the adjacent part, because the cooling speed of the thicker area is much slower than that of the surrounding area. The different cooling rates lead to the formation of depressions at the connection surface, which is called shrinkage marks. So how do we solve this problem? Mingyang Yutong dual color mold expert comes to tell you:
How to avoid the shrinkage mark in Injection mold construction processing? The shrinkage at the thicker part of the two-color Injection mold construction, such as rib or protuberance, is more serious than that at the adjacent part, because the cooling speed of the thicker area is much slower than that of the surrounding area. The different cooling rates lead to the formation of depressions at the connection surface, which is called shrinkage marks. So how do we solve this problem? Mingyang Yutong dual color mold expert comes to tell you:
1. Mold design factors
The geometric shape and material selection are usually determined by the raw material supplier and are not easily changed. However, there are still many factors related to mold design that may affect the shrinkage process of plastic processing by mold manufacturers.
2. Cooling channel design
The type and size of the cooling runner design gate may have multiple effects. For example, small gates such as tubular gates cool much faster than tapered gates. Premature cooling at the gate will reduce the filling time in the mold cavity, thereby increasing the probability of shrinkage marks.
3. Adjusting processing conditions
For molding workers, adjusting processing conditions is one way to solve the shrinkage problem of plastic processing. Filling pressure and time significantly affect shrinkage. After the component is filled, the excess material continues to fill the cavity to compensate for material shrinkage. If the filling stage is too short, it will lead to increased shrinkage and eventually produce more or larger shrinkage marks.
This method of solving plastic processing shrinkage may not reduce the shrinkage marks to a satisfactory level, but molding workers can adjust the filling conditions to improve the shrinkage marks.
4. Modify Mold
In the dual color mold injection molding process, it is possible to modify the mold appropriately. A simple solution is to modify the conventional core hole, but this method cannot be expected to be applicable to all resins. In addition, gas assisted methods can also solve the problem of plastic processing shrinkage.
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