The design of vacuum blister forming mould includes batch size, forming equipment, precision condition, geometrical shape design, dimensional stability and surface quality. 1, the size of the experiment, the mold production hours, wood or resin can be used for manufacturing. However, if the experimental mold is to obtain the products about shrinkage, dimensional stability and cycle time, and so on, should use a single cavity mold to experiment, and to ensure that it can be used in production conditions. Mold is generally made of gypsum, copper, aluminum or aluminum-steel alloy, rarely used aluminum-resin. 2, geometric shape design, design, often need to consider the size of stability and quality. For example, product design and dimensional stability require the use of yin Die (die), but the surface requirements of higher gloss products but require the use of master (convex die), so that the plastic parts order will be integrated into the two points, so that products can be under the best conditions for production. Experience has shown that designs that do not conform to actual processing conditions are often unsuccessful. 3, the size is stable, in the molding process, the plastic parts and mold contact surface than leaving the mold part of the dimensional stability is better. If the material thickness is changed in the future due to the requirement of material stiffness, it may lead to the conversion of the Yang mode to the yin mode. The size tolerances of the plastic parts must not be less than 10% of the shrinkage.
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