Quality Issues | Cause | Solution |
---|---|---|
Cracks and peeling on the surface of the product (occurring at the mold joints) | It is caused by the combined effects of strong thermal expansion, shrinkage and compression of the rubber during vulcanization. | Reduce the vulcanization temperature; accurately weigh the rubber material and reduce the vulcanization pressure; only release the mold when it is cooled to 40~50℃ after vulcanization. |
Has dark brown spots | There are air bubbles in the rubber material | Appropriately control the degree of re-refining to avoid excessive re-refining; accurately weigh the rubber material and make it into a certain shape to fill the mold cavity to effectively eliminate air; then pressurizing, the mold must be completely pressed and decompressed several times to eliminate air; ventilation holes are provided on the mold. |
There are traces of flow on the surface of the product | The flow of rubber is blocked | The rubber material is fully re-refines and quickly loaded and pressurized to avoid early vulcanization. |
There are white blooming spots on the surface of the product (vulcanized by vulcanizing agent BP) | Insufficient vulcanization | Properly increase the vulcanization temperature. |