1, the size of the test batch size, mold production hours, can be made of wood or resin. However, if the experimental mold is used to obtain data on the shrinkage, dimensional stability, and cycle time of the product, single-cavity molds should be used for the experiment and they can be used under production conditions. Molds are generally made of gypsum, copper, aluminum or aluminum-steel alloys, and aluminum-resins are rarely used.
2, geometry design, design, often consider the dimensional stability and surface quality. For example, the product design and dimensional stability require the use of a female die (mould), but a product with a higher surface gloss requires a positive die (punch die). This way, the plastic part orderer will consider both Point so that the product can be produced under optimal conditions. Experience has shown that designs that do not meet actual processing conditions often fail.
3, dimensional stability, in the molding process, the surface of the plastic parts and the mold to contact the dimensional stability of the part away from the mold is better. If the material thickness needs to be changed due to the need of material stiffness in the future, it may cause the positive mold to be converted into a negative mold. The dimensional tolerance of plastic parts must not be less than 10% of the shrinkage rate.