What are the factors that restrict the change of the shrinkage rate of the Cable Sleeve of the Automotive Wiring Harness Protection Sleeve?

The production of Automotive Wiring Harness Protection Sleeve is a technology. Like other rubber products, the shrinkage rate of the Cable Sleeve also has certain rules. The shrinkage rate of the Cable Sleeve refers to: after the product is cooled and solidified, its size is the same as the original Percent error between mold dimensions. Therefore, when designing the mold, the shrinkage rate must be considered first, so as not to cause errors in the finished product size and lead to defective products. The following editor will share the general law of the shrinkage rate of the Cable Sleeve of the Automotive Wiring Harness Protection Sleeve, hoping to help everyone.

1. Factors affecting the shrinkage rate of the Cable Sleeve: the higher the vulcanization temperature (beyond the positive vulcanization temperature), the greater the shrinkage rate. In general, the shrinkage rate increases by 0.1% to 0.2% for every 10°C increase in temperature.
2. The shrinkage rate of the Cable Sleeve in the calendering direction and the flow direction in the mold is greater than the shrinkage rate in the vertical direction; the longer the flow distance, the greater the shrinkage rate.
3. The more the amount of semi-finished Cable Sleeve, the higher the density of the finished product and the smaller the shrinkage rate.
4. The greater the plasticity of the Cable Sleeve, the smaller the shrinkage rate; the higher the hardness of the Cable Sleeve, the smaller the shrinkage rate.
5. The more the filler is used, the smaller the shrinkage; the higher the glue content, the larger the shrinkage.
6. In the multi-cavity mold, the shrinkage rate of the product extruded from the middle cavity is slightly smaller than that of the product from the edge cavity.
7. The shrinkage rate of injection products is smaller than that of molded products.
8. The shrinkage rate of thin products (section thickness less than 3mm) is 0.2% to 0.6% larger than that of thick products (above 10mm).