Hot air continuous vulcanization method is a commonly used silicone rubber vulcanization method, the advantage is that the pressed out products can be unrestricted, applicable to the larger diameter or thickness of thin rubber tube products extrusion molding, widely used in the production of silicone rubber wire, cable, the following list of continuous hot air vulcanization of silicone rubber pressed out products and solutions to common problems.
| Problem Description | Reason | Solution |
|---|---|---|
| Surface embrittlement | Vulcanization tank temperature is too high and press-out speed is slow | Adjust the temperature of the vulcanization tank and check whether the screen is partially blocked, which reduces the press-out speed. |
| bubble | Residual air inside the silicone material | Due to unsuitable temperature or too fast mixing speed, the size of the prefabricated silicone strip is too large and stuck in the inlet resulting in insufficient feed |
| Blistering | Wet raw materials, excessive moisture in wire and cable | The raw materials should be stored in a dry place and mixed under dry conditions. Pre-baked wire core |
| Sticky surface | Vulcanization tank temperature is too low to meet the press-out speed. Raw material is contaminated by oil | Increase the humidity of the vulcanizing tank or reduce the press-out speed to avoid oil contamination of raw materials |
| Size changes | Inconsistency between press-out speed and vulcanizing belt speed | Adjustment of press-out and vulcanizing belt speed |
| With dark lines or stains | The screw is too tight or bent in the barrel, and the metal is fed into the extruder | Replace the screw and remove the impurities in the raw material |