The uneven surface of the injection molded product can be solved by the injection filling masterbatch.
2019-11-27 10:38 来源:凯杰塑料填充母料厂家作者:凌 Time: 2019-11-27 10:38 Source: Qiagen filled with plastic masterbatch manufacturers Author: Ling
When the surface of the injection molded product is uneven, you can choose to fill it with injection molding to solve the problem.
Wang of Wenzhou always uses PP injection electronic products, but due to the large shrinkage of PP, when making a product with stiff ribs and thick walls, the product will generally have shrinkage dents on the top surface, which affects the beauty of the product. The masterbatch solves the low shrinkage of the product and greatly improves the flatness of the product surface. ，既能解决产品的收缩问题，还可以降低成本，不影响产品的外观。 Consult Kaijie's technicians online and want to match a PP injection filler masterbatch , which can solve the problem of shrinkage of the product, but also reduce the cost without affecting the appearance of the product. However, there are a lot of filler masterbatches on the market. I want to find a professional manufacturer, so President Wang wants to find out first, and also asked for some samples.
When the customer first tested the sample, the addition ratio was 90 parts of new material and 10 parts of Kaijie's injection masterbatch. The product quality was OK, the appearance and performance were good, and the shrinkage problem was obviously improved, but it was not completely solved. After the salesman asked some specific data, he proposed a solution, which is to add a change in the proportion, 80 parts of new material and 20 parts of injection molding masterbatch, and then test samples. The products made by the customer meet the requirements and the weight reaches the customer standard. There is no bump phenomenon, and it also reduces a lot of costs, so President Wang still feels good. It was decided to continue long-term cooperation with Kaijie.
So how does the shrinkage of injection molded products cause? The following editor will give you a general explanation: when injection molding products, it is caused by local internal shrinkage caused by gate sealing or lack of injection. Depression or micro-depression on the surface of injection molded products is an old problem in the injection molding process. Dent is generally caused by the local increase in shrinkage caused by the increase in wall thickness of plastic products. It may appear near external sharp corners or sudden changes in wall thickness, such as protrusions, ribs or the back of the support. In some unusual places.
The root cause of the dent is the thermal expansion and contraction of the material, because the thermal expansion coefficient of thermoplastics is quite high. The degree of expansion and contraction depends on many factors, among which the properties of the plastic, the maximum and minimum temperature ranges, and the cavity holding pressure are the most important factors. There are also factors such as the size and shape of the injection molded part, as well as the cooling rate and uniformity.
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