How to solve the problem that the silicone core is not tightly wrapped during extrusion?
Ordinary silica gel, also known as precipitation silica gel:
Color: translucent, milky white, light yellow, gray, etc.;
Hardness: 30°, 40°, 50°, 60°, 70°, 80°, etc., commonly used between 40°-70°;
Density: 1.1-1.12g/cm2;
Elongation: 400%;
Uses: The most used are mobile phone keys, miscellaneous parts, conductive glue and other low- and medium-grade silicone products.
Meteorological silica gel, also known as pure silica gel:
Color: transparent;
Hardness: 30°, 40°, 50°, 60°, 70°, 80°, etc., commonly used between 40°-60°;
Density: 1.1-1.12g/cm2;
Elongation: 600%-700%;
Features of silicone tube: Because this material has good transparency, strong tensile strength, and high cost;
Uses: Silicone tubes, protective sleeves and other products that require high flexibility.
The silicone rubber heating line is mainly made of silica gel, also known as raw silicone rubber, added to the double-roll rubber mixing machine or closed kneader, and gradually added white carbon black and other additives to repeatedly refining uniformly. According to the requirements of industry product technical standards, through extrusion Made into products.
Silicone rubber heating wire extrusion molding requires CL-26AB silica gel glue to be applied to the metal core, and then heat vulcanization molding by the encapsulation process. Need to pay attention to choose suitable models according to different encapsulation materials, such as different metals, copper, aluminum, and PC plastic.
Silicone encapsulation process: The silica gel and the cored wire are not tight, and there may be insufficient extrusion pressure test, unclean vulcanization, and vulcanizing agent poisoning. Solution:
1. Increase the extrusion pressure;
2. Increase vulcanization time or increase vulcanization stability;
3. liquid silicone materials need to pay attention to the use of platinum vulcanizing agent separately, beware of poisoning.
