In the hand board industry, vacuum molding is a common processing method, which is mainly used for small batch customization of plastic hand boards. Generally, it is more cost-effective to use vacuum molding for processing dozens to hundreds of plastic hand boards. The customer's requirements for the precision of the vacuum plate are very high, but the appearance of the vacuum plate is not very high. The reason why these two different situations occur is mainly because the vacuum replica hand board has its advantages and disadvantages. Let's introduce them in detail below.
Disadvantages of vacuum replica hand board:
1. Shrink and easy to deform. Because the vacuum re molding uses the principle of thermal expansion and cold contraction, if we make the hand board according to the size on the customer's drawing, after the liquid in the silicone mold cools, it is bound to shrink, resulting in deformation. Generally, the hand board is made by vacuum compound mold. When making silica gel mold, it should be a little larger than the size above. But even so, the hand board error of vacuum replica is still relatively large, usually 0.2mm or more.
2. The high-temperature resistance is low. Because the material of vacuum compound mold is liquid and is heated and cooled at high temperature, it is inferior to that processed directly on the plate in terms of performance. Generally, the hand board processed by CNC can withstand about 100 degrees in terms of high temperature, while the hand board produced by vacuum re molding can only withstand about 60 degrees. In addition, the strength and hardness of the hand board made by vacuum molding are not as convenient as those made by CNC.
Advantages of vacuum compound mold:
As the saying goes, "a handsome person conceals a hundred ugly people". Although the hand board produced by vacuum molding has so many disadvantages, it is cheap. Usually, it takes hundreds of yuan to process the hand board with CNC, and only tens of yuan to use vacuum mold. Therefore, many people with insufficient funds are willing to process it in this way.