How to solve the bubbles in the Automotive Wiring Harness Protection Sleeve?

The Automotive Wiring Harness Protection Sleeve is an extruded tube that is used as a carrier for liquid, gas and other materials to circulate and cover. Safe, non-toxic, environmentally friendly and hygienic, it is an indispensable material in many industries.

There are several kinds of production processes for Automotive Wiring Harness Protection Sleeve, and it is also complicated. In the production process, defective products are inevitable, and air bubbles are among them. For the situation where bubbles appear, how should we solve them? Let`s take a look together:
1) Raw material problem: It is estimated that the transparent white carbon black is impure, or mixed with other white carbon black;
2) Coking problems: the mixing of the Cable Sleeve is uneven, the filling capacity is unreasonable, and the degumming temperature and time are not well controlled.
3) For raw materials: choose transparent white carbon black with better purity, and clean the kneader before refining the transparent Cable Sleeve;
4) For coking process problems: control the kneading temperature and kneading time, extend the original kneading time by 5-10 minutes, and then perform the degumming inspection.
In short, the mixing temperature of the open mill is too low; the degree of mixing is not enough, the degree of filler dispersion is not enough; the air is not exhausted during vulcanization. I don`t think it`s due to lack of sulfur; use a sharp blade to cut open the small bubbles and observe, if there are yellow things in it, it`s a problem with RD, because it seems that the hardness of the Cable Sleeve is low, RD is not easy to break up, and there is more operating oil , if it is added together with carbon black, it will easily cause carbon black agglomeration and foaming. Observe the shape of the vesicles. If it is irregular, it is a material dispersion problem such as RD, film, etc.; if it is round, it may be moisture or Others, but it is unlikely to be a moisture problem, and the vulcanization temperature is too high to cause vesicles.