- (1) Excessive cooling of the product. The molding cooling (blowing) time increases, the inflation air pressure increases, and the wall thickness of the parison decreases, which is conducive to the shaping of the product and reduces the shrinkage of the product. However, the excessive cooling of the product not only reduces the production efficiency, but also reduces the shrinkage of the product, increases the rigidity, and makes it difficult to demold.
- (2) Errors in mold design. In the design of the inflation mold, the design is not reasonable enough due to inadequate consideration. For example, the mold cavity is not designed with a suitable demolding slope; the mold is in the handle and the part of the insert, and the slider movement is not coordinated; the mold guide post is not set properly or installed properly; the surface of the mold cavity is burrs, rough and uneven; The design of the depth or slope of the groove in the cavity is unreasonable, etc. All of the above will cause the product to be difficult to demold.
- (3) The anti-blocking and slippery properties of the product plastic raw materials are poor. When these phenomena occur, methods such as adding a release agent (external lubricant) and spraying a release agent in the mold cavity can be used to solve the problem.
- (4) Operation error. When the operator produces blow-molded products, he accidentally collides with the surface of the mold due to his careless work, such as scratching the surface of the cavity with a hard metal tool, causing burrs, etc., which may cause difficulty in demolding.
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