In order to improve the strength and temperature resistance of products, it has been a very good choice to use glass fiber to enhance the plastics. A large number of facts also prove the good performance brought by glass fiber. However, glass fiber and plastic itself are two different materials. Naturally, they also have problems of compatibility between the two.
Glass fiber exposure (or floating fiber) is a direct reflection of the compatibility of the two. From the aspect of glass fiber, glass fiber has long fiber and short fiber, which are all white and bundled. Adding fiber material is made by blending glass fiber and resin.
When the glue is injected, the flow of the material is similar to the flow of liquid. When there are some branches and other debris in the river, the coastal side will have a stoppage due to the attachment of such debris to the river bank. If it is in injection molding, it is the exposed glass fiber.
This is because the fluidity of the glass fiber is much worse than that of the plastic, and the flow of the plastic in the mold flows forward from the middle of the interlayer, and the two sides flow in the outward direction, so the best fluidity is sure to run to the most. In front, the poor fluidity will stay on the surface of the mold.
At the same time, glass fiber has the effect of promoting crystallization, while PP and PA are crystalline materials. Crystallization is quick to cool; when cooling is fast, the glass fiber is difficult to be bound and covered by the resin, so that the glass fiber is easily exposed.