The rubber part mold must be easy to demould when it is designed, it must conform to the outline and shape of the rubber part, and the structure must be simple, reasonable, easy to operate, and meet the technical requirements;
The mold should be maintained frequently to observe its cleanliness, whether it is deformed, whether the positioning is firm, and whether the surface is smooth.
The structure of rubber parts is unfavorable. When designing rubber parts, attention should be paid to its shape, thickness, and demolding slope, of which demolding slope is the main factor. After the product is released from the furnace, the centripetal shrinkage occurs due to the cooling of the product, which generates a large holding force on the core or pin, thus hindering the demoulding. If the demolding slope is increased, this resistance can be significantly reduced, and defects such as tearing of the product caused by no slope can also be avoided. Generally, the slope of the product is between 1° and 3°.
Unreasonable product formula, insufficient vulcanizing agent and accelerator in the formula, or unreasonable vulcanization temperature and time design, resulting in insufficient sulfur; or too much rubber raw rubber content, too much accelerator vulcanizing agent, etc., will also lead to difficulty in demolding.
