As an important hydraulic hose material, wire spiral hose is widely used in industry and agriculture. However, in actual use, many users report that pressure test leakage often occurs, which brings great trouble to production and maintenance.
Analysis and solution of the cause of pressure test leakage
1.Problem: Inner rubber wrinkles
Cause: There is rubber withdrawal or the inner rubber is squeezed during the winding process
Solution: The rubber stiffness should be increased or the freezing should be strengthened or the amount of hose core isolation agent should be controlled.
2. Problem: The outer rubber has pitting during the pressure test, and the pitting does not disappear after the pressure is released
Cause: Insufficient vulcanization
Solution: If it is still immature after secondary vulcanization, it indicates a problem with the formula. If it is mature after secondary vulcanization, it is due to insufficient vulcanization time or localized condensation
3. Problem: During the pressure test, the outer rubber had pitting and water leakage, and the pitting disappears after the pressure is released.
Cause: The winding layer is too thin or the inner rubber modulus is not enough
Solution: Increase the braiding density or increase the inner rubber modulus
4. Problem: The same side of the entire hose leaks
Cause: The inner rubber having scratches
Solution: The mouth shape should be checked in time and impurities should be prevented from mixing
5. Problem: There are foreign objects
Cause: Impurities are mixed into the rubber
Solution: Impurities should be prevented from mixing
6. Problem: The back strands severely press through the inner rubber
Cause: The stranding tension is uneven
Solution: The stranding tension should be adjusted in time
7. Problem: The inner rubber has concave spots
Cause: The gap between the steel wires is too large or the inner rubber is too thin or the vulcanization speed is too slow
Solution: Add a layer of middle rubber or adjust the vulcanization speed
8. Problem: The inner rubber has cracks
Cause: The rubber is unevenly dispersed or the raw rubber strength is too low or the inner hole is pressed too small (rigid mandrel)
Solution: Improve the dispersion of the rubber material, increase the raw rubber strength, increase the extrusion pressure, and enlarge the inner hole
9. Problem: Scratches on the inner surface of the inner rubber
