What are the reasons for the explosion of the Automotive Wiring Harness Protection Sleeve?

People in the industry know that Automotive Wiring Harness Protection Sleeve often encounter various problems during the production process. For some relatively soft products made of low-hardness materials, they are prone to tearing, which is called edge bursting in the industry. This phenomenon is a difficult problem for many Automotive Wiring Harness Protection Sleeve manufacturers. Some manufacturers have adjusted the time, temperature, pressure, etc. of the product during production, but this phenomenon also occurs. What is the reason?

1. Generally, the hardness of the material of the product is about 30~40 degrees, and the phenomenon of edge bursting is easy to occur, while the material with high hardness basically does not have this phenomenon. The reasons for the edge bursting phenomenon of the product are:

①The amount of carbon black filled during production is too much and the amount of silicone oil is too large;

② The silicone oil in the raw material is left for too long after the rubber compound is completed, causing the vulcanizing agent to gradually fail;

③The amount of vulcanizing agent used in mixing is too much and the vulcanization temperature is too high;

④The raw materials are too heavy, resulting in excessive burrs of the product, plus the soft material, self-cutting edges and other reasons.

2. However, if there are problems, there are corresponding solutions. According to the excessive number of multi-mold holes, the products produced have one or two edge burst phenomena:

①The corresponding temperature can be appropriately reduced, the temperature of the lower mold will drop more, and the temperature of the upper mold will drop less;

②If there are more edge bursts in the first mold, it is recommended to sandblast the mold, and then try again;

③The mold release time should be shortened as much as possible to prevent the temperature of the mold core from dropping, and the frequency of exhaust should be kept at one time;

④ If the vulcanization time is relatively long, it can be added twice appropriately.