Generally speaking, there are the following processing methods: pre-pressure to improve product quality, improve molding efficiency, pre-press powder or fiber molding plastic into a certain shape. In order to improve the processing performance of molded plastic and shorten the molding cycle, the operation of molded plastic is carried out before molding. The mold adds the required amount of plastic to the mold, closes the mold, exhausts, maintains the mold at the temperature and pressure for a period of time, and then unmolds and clears the mold. The main equipment for compression molding is press molding.
The press uses more self-contained hydraulics, ranging in tonnage from tens to hundreds of tons. There are press and press up. The mold used for compression molding is called die mold and is divided into three categories: overflow mode and semi-spill mold. The main advantage of compression molding is that it can be molded with a larger plane and mass production of the product. Its disadvantage is that the production cycle is long and inefficient. The mulch. A method of combining two or more layers of the same or different materials by heating or pressurizing two or more layers with or without an adhesive. Laminators are commonly used for laminates. There are several floating hot press plates between the power plate and the retaining plate of this press. Common laminated materials are cotton, glass, paper, asbestos cloth, etc. Resin is phenolic resin, epoxy resin, unsaturated polyester and some thermoplastic resins. Cold press molding. Cold-pressed molding is also known as cold-press molding.