Compression molding process SMC/BMC/GMT

Compression molding is a closed mold process,the most common choice for high-volume composite parts and often associated with SMC,BMC material.

Matched mould are mounted in a hydraulic press machine,a measured charge of moulding compound is placed in the open mould,for example,SMC was cut into desired shape,peeling off the protective film on bothside,overlapped according to a certain requirements,then placed in the mould on proper position.we need to know,Placing the compound into the mould is fairly easy,but orienting the various layers of material correctly requires training and experience.

The heated mould halves are closed in the press under very high pressure ranging from 800 psi to over 2000psi,depending on material type,thickness,size and shape of par.The mould remains closed for a set peried of time based upon the given material,cycles time range from less than a minute to about nine minutes.This allows the resin material to melt and flow within the mould,thus completely filling the void between the two mould halves before solidifying,then remove the product from the compression mould.

When you get the parts,there may be a small amount of resin flash around the edges that needs to be removed,need a trimming process.

Below pictuer show the pressing process,molding temperature and molding pressure affects the quality of SMC/BMC/GMT products.Take various factors into consideration ,we should choose the best molding temperature,molding pressure and dwell time.

Compression molding process SMC/BMC/GMT

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Compression Mould

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