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Compression moulding process

Join Date: 2020-03-27

The compression moulding process is a method specifically used to produce composite material parts to replace traditional metal parts. It is a moulding method that puts preheated polymer into an open heated mould cavity. After closing the mould, pressure is applied to force the material to contact all areas of the mould. Throughout the process, heat and pressure are maintained until the polymer is cured.

Although thermoset or thermoplastic can be compression moulded, most applications today use thermoset polymers. Compression moulding is a large-capacity, high-pressure plastic moulding method suitable for moulding complex high-strength objects. Due to the short cycle time and high productivity, many organizations in the automotive industry have chosen compression moulding to produce parts.

What is compression Moulding Process

Compression molding is one of several molding processes. Compression (force) and heat are used to shape the raw materials, for example by using metal molds for hydraulic and pneumatic sealing. Within a specified period of time when the mold is closed, the raw material is heated in the mold until it is flexible. When removed, the molded product usually contains excess material (often called flash), which has been extruded when heated and compressed in the mold. An experienced cleaning team removes burrs to maintain accurate measurements of manufactured products

Compression Moulding Process Step 1
(1) Feeding: Add a specified amount of material into the mould as required. The amount of material directly affects the density and size of the product.

Compression Moulding Process Step 2
(2) Closing the mould: Close the male mould and the female mould. Note that the closing speed is a fast and slow process. This method of operation is conducive to shortening the non-productive time, avoiding mould wear, and avoiding raw materials being taken out of the air due to too fast clamping. After the mould is closed, the pressure can be increased to heat and pressurize the raw materials.

Compression Moulding Process Step 3
(3) Exhaust: When moulding thermosetting plastics, in order to exclude these volatiles and the air in the mould, the loose mould can be discharged for a short time. The exhaust operation can shorten the curing time and improve the physical properties of the product.

Compression Moulding Process Step 4
(4) Curing: The curing of the thermosetting plastic is maintained at the moulding temperature for a period of time. The moulding curing time is usually 30 seconds to several minutes. Too long or too short curing time will affect the performance of the product.

(5) Demoulding and subsequent processing: In order to further improve product quality, thermosetting plastic products are usually processed after demoulding. Can reduce or eliminate the internal stress of the product, which is conducive to improving the performance and strength of the product.


MDC Mould was established in 1997. Now we're a leading compression mold maker in china, including SMC, BMC, GMT, LFT, LWRT, CARBON FIBER. Our experience in mold design and manufacture spans many industries including Automotive, Electrical, House wares, Industrial and many more. For more info about us, please make a visit to us.


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