What is a compression mold?
Compression mold is also called die press, which is the forming method of molding plastic in the closed mold cavity with the help of pressure (usually still heated). Generally, the compression mold is suitable for thermosetting plastics, such as phenolic plastic, amino plastics, unsaturated polyester plastic, etc. Compression moulds consist of three processes: pre-pressure, preheating, and moulding:
The prepressure is to improve the quality of the products and the efficiency of moulding, and to prepress the powder or fiber form plastic into a certain shape. Preheat to improve the machining properties of die plastic and shorten the molding cycle, and to heat the molding plastic before forming. Moulds the mold to add the required amount of plastic, close mold, exhaust, to maintain a period of time under molding temperature and pressure, and then remove the mold operation.
The main equipment used in compression moulds is press and mold. The most commonly used are self-contained hydraulic presses, which range from dozens of tons to several hundred tons. Have lower pressure press and upper pressure press. The molds used to compress moulds are called press moulds, which are divided into three categories. Overflow mold, semi-overflow mold and mould. The main advantage of the compression mould is that it can be moulded by larger planar products and mass production, and its disadvantages are long production cycle and low efficiency.
