How to prevent the appearance of dark marks in the Automotive Wiring Harness Protection Sleeve?

Inconsistent surface colors often appear in the production process of Automotive Wiring Harness Protection Sleeve. The main manifestation is that there are two kinds of colors or water ripples that can be distinguished by naked eyes on the formed Automotive Wiring Harness Protection Sleeve. Such a situation is a defective product. , need to be scrapped or reworked, the industry calls it "dark marks". For manufacturers of Automotive Wiring Harness Protection Sleeve, the "dark marks" must be eliminated, so as to ensure that the defective rate of products is reduced, production is carried out in an orderly manner, and the production cost of the enterprise is reduced. Then how to prevent the appearance of dark marks in Automotive Wiring Harness Protection Sleeve?

First of all, when selecting the raw material of the Cable Sleeve, it must be strictly controlled. For example, it may be difficult to distinguish the color difference and hardness of two different Cable Sleeve raw materials on the naked eye, but in fact there is still a big difference between the two. The difference is that if these two batches of Cable Sleeve raw materials are mixed and molded, then the quality inspection after molding will find a small color difference, and it will not be shipped, because the quality inspection of our silicone rubber is very strict, for those with color difference Can only be dealt with in the form of defective products. Therefore, when choosing the raw materials of the Cable Sleeve, it must be sure that there is no mixing. It is very important to know the source. If the head is wrong, all the subsequent processes can only be soy sauce!
Secondly, the Automotive Wiring Harness Protection Sleeve is colorless, non-toxic, and tasteless. If you want to make the Automotive Wiring Harness Protection Sleeve colorful, you need to add "color masterbatch". Therefore, the choice of color masterbatch must not be wrong. If the temperature resistance of the color masterbatch is not good, then basically the Automotive Wiring Harness Protection Sleeve becomes a waste product, because the color masterbatch must be integrated into the Automotive Wiring Harness Protection Sleeve for high temperature molding. At this time, the color masterbatch is Only by melting at high temperature can the color of the Automotive Wiring Harness Protection Sleeve change. If the color masterbatch affects the entire production due to poor temperature resistance, the consequences are self-evident, so the most suitable color masterbatch must be selected in terms of degree of selection.
In addition, you should also pay attention to the cutting process of the Automotive Wiring Harness Protection Sleeve, because if the rubber material is cut too thick or too narrow, it may be inconvenient to exhaust during cutting, and it will also cause the Cable Sleeve product to be damaged. After forming, the surface color has color difference, so it is also necessary to ensure the best cutting of the product when cutting.