1. Optimize Rubber Mixing to Avoid Air Traps
Bubbles in rubber hoses often form during production due to trapped air in the rubber compound. First, slow down the rubber mixing speed—fast mixing whips air into the material, creating tiny bubbles. Add a small amount of defoaming agent to the rubber mix; this breaks up air pockets before they set. Also, ensure the mixing equipment is sealed tightly: loose lids or gaps let extra air enter. These steps stop bubbles from forming at the source, ensuring a smooth rubber base for the hose.
2. Improve Vulcanization Conditions for Rubber Hoses
Poor vulcanization (heating and curing) can make existing air pockets expand into bubbles in rubber hoses. First, control the vulcanization temperature—avoid overheating, as high heat makes air expand rapidly. Increase the vulcanization pressure slightly; this presses air out of the rubber before it hardens. Also, extend the pre-vulcanization time by 5-10 minutes: this gives air more time to escape slowly. By adjusting these parameters, you prevent small air pockets from turning into visible bubbles in the finished rubber hose.
3. Inspect and Fix Installation/Usage Issues
Bubbles can also form after using the rubber hose, usually from damage or improper use. First, check the hose for small cracks or punctures—these let air enter when the hose is under pressure. Replace cracked hoses immediately; for minor leaks, use rubber-specific sealant to patch holes. Avoid bending the rubber hose too tightly during use: sharp bends pinch the hose, trapping air inside. Also, don’t exceed the hose’s pressure limit—high pressure can force air into weak spots, creating bubbles. These checks keep bubbles from appearing during daily use.