Because different molds have been applied in many areas, coupled with the professional mold manufacturing technology in these years have also been a certain change in development, so in this part, summed up the vacuum design of the general design of the mold.

Vacuum Blister Mold design includes batch size, molding equipment, precision conditions, geometric design, dimensional stability and surface quality and so on.

1, the size of the experimental use, mold production hours, can be made of wood or resin. However, if the experimental mold is used to obtain data on shrinkage, dimensional stability and cycle time of the article, it is necessary to use a single cavity mold to experiment and to ensure that it can be used in production conditions. Molds are generally made of gypsum, copper, aluminum or aluminum-steel alloys, and are rarely used with aluminum-resin.

2, geometric design, design, often to consider the dimensional stability and surface quality. For example, product design and dimensional stability require the use of female mold (die), but the surface requirements of high gloss products are required to use the male model (punch), so that the plastic parts will be taken into account the two parties So that the product can be produced under optimum conditions. Experience has proved that designs that do not meet the actual processing conditions are often failing.

3, dimensional stability, in the molding process, the plastic parts and mold contact with the surface than the part of the mold to maintain the stability of the better. If you want to change the thickness of the material due to the need for material stiffness in the future, it may lead to the conversion of the male mold to the female mold. The dimensional tolerances of the plastic parts shall not be less than 10% of the shrinkage.

4, plastic surface, the molding material can be wrapped in the scope of the plastic parts can be seen in the surface structure should be in contact with the mold forming. If possible, do not clean the plastic parts with the mold surface. Like the use of female mold manufacturing tub and laundry basin situation.

5, modification, if the use of mechanical horizontal saw saw the clamping part of the plastic parts, in the height direction, at least 6 ~ 8mm margin. Other finishing work, such as grinding, laser cutting or jetting, must also leave margin. The gap between the cutting die cutting line is the smallest, and the distribution width of the punching die is very small.

6, shrink and deformation, plastic easy to shrink (such as PE), some plastic parts easy to deformation, in any case of prevention, plastic parts in the cooling phase will be deformed. Under such conditions, it is necessary to change the shape of the mold to adapt to the geometric deviation of plastic parts. For example, although the plastic wall remains flat, its datum center has deviated from 10mm; it can raise the mold base to adjust the amount of shrinkage.

7, shrinkage, in the manufacture of plastic molding mold must take into account the following factors of contraction. ① molded products shrink. If the shrinkage of the plastic is not clearly known, it must be sampled or tested by a similar shape of the mold. Note: Through this method can only get shrinkage, can not get the deformation size. ② adverse effects of intermediate media caused by contraction, such as ceramics, silicone rubber and so on. ③ shrinkage of the material used in the mold, such as casting aluminum shrinkage.