Kevlar Braided Sleeve are difficult to vent and shrink and crack.

The edge (edge skin) of Kevlar Braided Sleeve is partially cracked, pulled, or shrunk. Industry insiders call this phenomenon a burnt edge;

1. Mainly due to 4 reasons
①The vulcanizing agent content in the Special Material Braided Sleeve is too high (that is, too much vulcanizing agent is added);
②The vulcanization time is too long;
③The vulcanization temperature is too high;
④The vulcanization pressure of the vulcanizer is too high.
2. There are 4 reasons why it is difficult to vent Kevlar Braided Sleeve.
①The exhaust distance is too large or too short and should be strictly controlled between 1-5cm;
② If the primary exhaust is not exhausted, the secondary exhaust can be used to solve the problem;
③The vulcanization time has not expired;
④ There is a problem with the Special Material Braided Sleeve. There is moisture/uneven dispersion of the vulcanizing agent/uneven mixing of the Special Material Braided Sleeve.
3. Kevlar Braided Sleeve have difficulty venting and edge shrinkage cracks usually occur at the mold facets. To solve these problems, other details should also be paid attention to.
① Pay attention to the amount of materials used;
② Also check whether the closing edge of the mold is damaged. If necessary, polish it with a whetstone;
③Whether there will be scratches when demoulding, pour a little R angle on the areas where they will be scratched;
④Whether low-quality silicone is used also has a certain relationship.
In short, different Kevlar Braided Sleeve will have different problems. The test should be adjusted according to its own requirements, process, temperature, vulcanization time, pressure, etc.