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Introduce to compresson molding

Join Date: 2020-04-26

Compression molding (also known as compression moulding) is to put powder, granular or fibrous plastic into the mold cavity at the molding temperature, and then close the mold to make it mold and solidify. Compression molding can be used for thermosetting plastics, thermoplastics, and rubber materials.

The molding process uses the characteristics of each stage of the resin curing reaction to form the product, that is, the molding material is plasticized, flows and fills the mold cavity, and the resin is cured. In the flow process of the molding material filling the mold cavity, not only the resin flows, but also the reinforcement material flows. Therefore, the molding pressure of the molding process is higher than other process methods and belongs to high-pressure molding. Therefore, it requires not only a hydraulic press capable of controlling the pressure, but also a metal mold with high strength, high precision, and high-temperature resistance.

Application of compression molding

Widely used in industry, agriculture, transportation, electrical, chemical, construction, machinery, and other fields. Due to the reliable quality of molded products, they have also been used in weapons, aircraft, missiles, and satellites.

Advantage of compression molding

  • (1) The loss of raw materials is small and will not cause excessive losses (usually 2% to 5% of the quality of the product).
  • (2) The internal stress of the product is very low, and the warpage is also very small, and the mechanical properties are relatively stable.
  • (3) The cost of the molding equipment is low, the mold structure is relatively simple, the manufacturing cost is usually lower than that of the injection mold or the transfer molding mold, and the maintenance cost of the mold is lower.
  • (5) Larger flat products can be formed, and the size of the products that can be molded by molding is only determined by the clamping force and template size of the existing molding machine.
  • (6) The shrinkage of the product is small and the repeatability is good.
  • (7) A mold with a large number of cavities can be placed on a given template, and the productivity is high.
  • (8) High production efficiency.
  • (9) The product has high dimensional accuracy, smooth surface, and no need for secondary modification.
  • (10) Products with complex structures can be formed at one time.
  • (11) Mass production, the price is relatively low.

Disadvantages of compression molding

  • (1) The molding cycle in the entire production process is long, the efficiency is low, and the staff has a large physical consumption.
  • (2) It is not suitable for the molding of complex products with depressions, side slopes, or small holes.
  • (3) In the production process, it is difficult to fully fill the mold, and there are certain technical requirements.
  • (4) After the curing stage, different products have different stiffness, which has an impact on product performance.
  • (5) For products with high dimensional accuracy requirements (especially for multi-cavity molds), the process is somewhat short.
  • (6) The flash of the final product is thick, and the workload of removing the flash is large.
  • (7) The disadvantage of compression molding is that the mold manufacturing is complicated, the investment is large, and due to the limitation of the press, it is most suitable for mass production of small and medium-sized composite materials

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