Will bubbles appear in the Automotive Wiring Harness Protection Sleeve during the production process?

Bubbles will appear in Automotive Wiring Harness Protection Sleeve due to poor production technology. What are the causes and forms of bubbles? The editor below will explain to you the causes and forms of bubbles, hoping to help people who encounter these problems and don`t know how to solve them.

1. Several forms of bubbles produced in Automotive Wiring Harness Protection Sleeve
① Low temperature and long time vulcanization, the Braided Sleeve is heated for a long time, the vulcanization starts slowly, and the gas has enough time to discharge from the mold. At this time, there are fewer defects inside the Cable Sleeve and the physical properties after vulcanization are higher.
② After short-term vulcanization at low temperature, the Braided Sleeve is partially cross-linked and the gas cannot be completely discharged, causing bubbles to occur. At this time, most of the bubbles are on the surface of the product.
③ High temperature for a short period of time, especially for thick products, the surface has been vulcanized and the inside has just begun. After the pressure is released, the internal gas expands. At this time, most of the bubbles are in the center of the product.
④ After being exposed to high temperature for a long time, the gas inside the product is suppressed, and there are no defects on the surface. However, microscopically, the gas always exists inside the Cable Sleeve, which easily produces more defects and the physical properties are not high.
2. Causes of Bubbles in Automotive Wiring Harness Protection Sleeve
① The gas is mixed into the Braided Sleeve during the processing process, as well as the moisture absorbed by the filler. The air contained in the holes inside the filler will expand and overflow after heating.
②If the Cable Sleeve does not start to cross-link after the gas overflows, the gas will be discharged from the mold along with the expansion of the Braided Sleeve.
③If the cross-linking of the Cable Sleeve is completed, the flow of gas will be restricted and visible bubbles and micropores will not be formed, but the gas will still be there.
④ If the external vulcanization of the Cable Sleeve is completed and the internal vulcanization has not yet reached positive vulcanization, after the mold pressure is released, the internal gas flow will gather to form micropores.