Friends who do not understand molds are easily confused by rubber molds and plastic molds. The feeling is similar. In fact, the difference between rubber and plastic is very large. Whether it is raw materials, processing equipment or molding, there are completely different differences. There are several aspects to plastic molds. The first is that their raw materials are different, and secondly the equipment they use is different from the way they are processed, and then the molding method is different. The following is a detailed introduction to the difference between rubber molds and plastic molds.
The difference between rubber molds and plastic molds is first of all raw materials. This can be seen from their names. Most plastics refer to PE, PP, PVC, PC and other materials. These are the most commonly encountered in our lives. Rubber generally refers to natural rubber and synthetic rubber, which is the essential difference between them.
The difference between rubber molds and plastic molds is in addition to raw materials, equipment and processing methods. Rubber molds are generally hot-dry compression molds. During processing, the rubber strip is placed in the cavity of the rubber mold. After the mold is closed, the mold is placed In the hot press, heat, pressurize and keep warm, and finally take out the mold, open the mold and take out the product. Plastic molds are generally injection molds. The molten plastic materials are injected into the mold cavity. After the raw materials are cooled and solidified in the mold cavity, the mold is opened to eject the finished product.
Finally, there is a difference in the molding method. For rubber molds, the rubber material is vulcanized and fixed under the fixed containment and limitation of the mold cavity, so the shape of the product completely matches the shape of the mold cavity. As long as the design shrinkage ratio is correct, it can be qualified. Molded products. The cross-sectional shape of the plastic mold is different from the final cross-sectional shape of the rubber product obtained after injection molding, or even very different. The reason is that the vulcanization of the rubber extruded product is completed on an open microwave (or other vulcanization method) vulcanization production line The injection mold is formed by injecting plastic into the mold and cooling it.
