1. The rubber products have insufficient glue.
The main reasons are:
The consumption of semi-finished products is insufficient or the glue filling volume is too low; The plate rises too fast and the glue does not flow sufficiently; The mold cannot seal the glue; The exhaust conditions of the mold are poor; The mold temperature is too high.
These can be solved from the following aspects:
Re-determine the glue filling volume of the mold; Slow down the plate rising speed and repeatedly release the air; Improve the mold design; Reduce the mold temperature and accelerate the operation speed; Lower the mold temperature.
2. The glue edges of the rubber products are too thick and the products are overweight.
The main reasons are: The glue filling volume is too large; The plate pressure is insufficient; The mold does not have the corresponding glue reserve groove.
These can be solved from the following aspects: Strictly control the consumption of semi-finished products; Increase the plate pressure; Improve the mold design.
3. The rubber products have rolled edges, pulled edges and shrinkage edges.
The main reason is: The processing performance of the glue is poor.
These can be solved from the following aspects: Use casting and injection methods for production to reduce the Marni viscosity of the glue.
4. The rubber products have cracks.
The main reasons are: The glue is dirty; There is too much release agent; The glue is scorched.
These can be solved from the following aspects: Ensure the cleanliness of the semi-finished products; Use the release agent reasonably; Extend the scorching time.
5. There are bubbles in the rubber products.
The main reasons are: The compounding agent contains substances that decompose during vulcanization and cause air pockets during processing; The air in the mold cavity has not been completely exhausted during processing; The mold has no exhaust line.
These can be solved from the following aspects: Repeat exhaust before closing the mold; Add calcium oxide to the formula.
6. The molded products of the rubber products are torn.
The main reasons are: There is too much or too little release agent; The mold is opened too quickly, and the force is uneven; The glue has poor fluidity and the semi-finished products have poor adhesion; The mold corners and chamfers are unreasonable.
These can be solved from the following aspects: Use the release agent reasonably; Open the mold evenly and uniformly; Reduce the Marni viscosity of the glue; Improve the mold design.
7. The rubber products are too rough.
The main reasons are: The mold surface is rough; The curing time of the mixed rubber is too short.
These can be solved from the following aspects: Clean the mold; Extend the curing time.