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What Is The Compression Mold?
Oct 18, 2018

Compression mold, also known as die press, is a molding method in which a molding compound is pressurized (usually still heated) in a closed cavity. In general, compression molds are suitable for thermosetting plastics such as phenolic plastics, aminoplasts, unsaturated polyester plastics and so on.

 


34302097_372591689813855_4968819330843148288_nThe compression mold consists of three processes: pre-pressing, preheating, and molding. Pre-pressing To improve product quality and improve molding efficiency, the powder or fibrous molding material is pre-pressed into a certain shape. Preheating In order to improve the processing performance of the molding compound and shorten the molding cycle, the mold plastic is first heated prior to molding. Molding is done by adding the required amount of plastic to the mold, closing the mold, and venting the mold, maintaining the molding temperature and pressure for a period of time, and then releasing the mold to remove the mold.


The main equipment used for compression mould is presses and moulds. Most of the presses used are self-contained hydraulic presses with tonnages ranging from tens of tons to several hundred tons. There are down presses and presses. The molds used for compression molding are called press molds and are divided into three categories; overflow molds and semi-overfill molds are not overflow molds. The main advantage of compression mold is that they can be molded on large flat products and can be mass produced. The disadvantages are the long production cycle and low efficiency.


The concept of mold design refers to the digital design of enterprise molds, including cavity molds and cold punches. Based on traditional mold design, digital design tools are fully used to improve the mold design quality and shorten the mold design cycle, which is a specific structure. An industrial product that shapes a material in a certain manner is also a production tool that can batch produce parts of industrial products that have a certain shape and size requirements. As large as airplanes, cars, teacups, and nails, almost all industrial products must rely on molding. The high precision, high consistency, and high productivity of parts made with molds are unmatched by any other processing method. The mold determines to a large extent the product's quality, effectiveness, and new product development capabilities.