Key Word: Taili Plastic Machinery; Taili Plastic Machinery-Capacity Improving Expert; Efficient; Stable; Shrinkage Rate
Recently, some friends have read the last article of Taili Plastic Machinery and consulting us: his products have encountered the problem of surface shrinkage control. How can he solve the problem?
For most employees in the injection molding industry, it is rarely possible to control the shrinkage rate of products. With limited cost and investment, it can be called "impossible task".

But it's not hard for those who can do it. In order to control the shrinkage rate of simple household appliances without excessive cost, the specific methods are as follows:
1. Clarifying molds and raw materials
In order to control the shrinkage of the product in a reasonable range, the first thing to do is to clarify the mold material and product raw material. Because the thermal expansion coefficient of different steel products, such as P20, 2344 and so on, is about 20%. So for the products with high precision requirements, we must first determine which material to use.
The control of product raw materials is also particularly important, because the shrinkage of general resin is about 10 times that of steel. For products with shrinkage requirements, manufacturers should determine the raw materials to be used before subsequent operation steps.
2. Clarifying test method
The measurement of product shrinkage can be carried out only under the condition that the  test method is clarified. Generally in ordinary factory conditions, the product can be cooled for about 36 hours, and then tested and compared under constant temperature. If there is a constant temperature chamber, the temperature is better to be controlled at 23 ℃.
The same test method must be used for different batches of products, so that the change of shrinkage can be clearly obtained for subsequent adjustment.
3. Adjusting the process
If the shrinkage of the product is too large, the molding temperature of the product can be reduced, the back pressure of the pre-molding can be reduced, and the injection pressure can be reduced. These adjustments can minimize the internal stress of products and reduce the shrinkage of products caused by internal stress.
If the cooling tower is used at room temperature, the shrinkage of the product can be greatly reduced by shortening the cooling time as far as possible.
Taili Plastic Machinery always keeps in mind that what a good injection molding machine factory should do is to help improving the capacity and boosting the profits, rather than offer the similar products the customers need. This is also what Taili Plastic Machinery keeps doing.
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