What about rubber molding, foaming and layering?
Foaming1 vulcanization is not sufficient, the temperature is too low or time is too short, so that the volatile compounds produced during curing have not been cleaned out;2, under the pressure of vulcanization, the trapped gas and sulfur volatile matter can not be discharged in time3, there is air or moisture in the glue;4, curing temperature is too high, the surface of the gum material premature vulcanization, hindered the glue material in the steam, air free precipitation5 vulcanization speed of material is too fast
2. rubber or mold contaminated by grease or other impurities and layered in contaminated areas3. release agent too much spray, so that part of the invasion of rubber, resulting in delamination, cracking4. mixing uneven or spray cream5. plastic material is too bad
Return the glue (the rubber has not been used up after heat treatmentThe glue and the new rubber are mixed together to heat up, and the remaining glue is called a return glue. When the mixture is mixed with the new rubber, the mixture is uneven and the degree of vulcanization is not uniform, resulting in delamination
