1. Lack of glue in rubber products The main reasons are […]
1. Lack of glue in rubber products
The main reasons are:
The unit consumption of semi-finished products is insufficient or the amount of glue loaded is insufficient; the plate rises too fast, and the rubber material does not flow sufficiently; the mold cannot seal the rubber material; the mold exhaust conditions are not good; the mold temperature is too high.
It can be solved from these aspects:
Re-determine the amount of glue loaded in the mold; slow down the rising speed of the plate and repeatedly deflate; improve the mold design; reduce the mold temperature and speed up the operation; reduce the mold temperature.
2. The rubber edge of the rubber product is too thick and the product is overweight
The main reasons are: the amount of glue is too large; the pressure of the plate is insufficient; the mold does not have a corresponding residual glue groove.
It can be solved from these aspects: strictly control the unit consumption of semi-finished products; increase the plate pressure; improve the mold design.
3. Rolling edge of rubber products, drawing edge and shrinking edge
The main reasons are: poor processing performance of rubber materials.
It can be solved from these aspects: the use of casting and injection methods to reduce the Mooney viscosity of the rubber compound.
4. Cracks in rubber products
The main reasons are: the rubber material is dirty; the release agent is too much; the rubber material is scorched.
It can be solved from these aspects: ensuring the cleanliness of semi-finished products; rational use of release agents; prolonging scorch time.
5. Rubber product bubbles
The main reasons are as follows: the material containing the sulfide decomposed gas in the compounding agent has gas during processing, and the air in the mold cavity is not completely exhausted; the mold has no exhaust line.
It can be solved from these aspects: repeatedly deflate before closing the mold, open the exhaust line of the mold; add calcium oxide to the formula
6. Rubber products are torn out of molded products
The main reasons are: too much or too little release agent; too fast mold opening, uneven force; poor fluidity of rubber material, poor adhesion of semi-finished products; unreasonable mold corners and chamfers.
It can be solved from these aspects: rational use of release agent, uniform stress on the product when the mold is opened, reducing the door viscosity of the rubber compound, and improving the mold design.
7. Rubber products are too rough
The main reasons are: the surface of the mold is rough; the scorch time of the rubber compound is too short.
It can be solved from these aspects: cleaning the mold; prolonging the scorch time.