First, cold water immersion
When the rubber appears to expand, you can try to soak it in cold water. Since the cold water temperature is lower than room temperature, the temperature of the rubber material can be reduced, thus making it shrink.
The specific operation method is: put the rubber product into the water, ensure that it is completely soaked, and then let it stand for a period of time. If the rubber material is not fully shrunk, you can soak it several times and use this method repeatedly until you achieve the effect you want.
Second, compression recovery
Another effective method is to shrink the rubber material through compression recycling. This method is often used in the processing of components such as rubber pipes or sealing rings.
After compression, the rubber material will deform to a certain extent and produce internal tension, which will cause the organizational structure of the material to change, thus making it shrink.
Therefore, a compressor or other corresponding equipment is used to compress the rubber to reduce it to the required size. This method has a more obvious effect, but attention should be paid to mastering the strength and time of compression to avoid deformation or deterioration of rubber materials.
Summary: The above are two effective methods to shrink rubber materials, respectively, cold water immersion and compression recovery. In use, the appropriate method should be selected and its operating specifications should be reasonably mastered to achieve good results.