What process is used to make long fiber composites?

RTP Company uses a pultrusion process to manufacture long fiber thermoplastics (LFT), which entails pulling continuous fiber rovings through a polymer melt in a specialized processing die. The resulting composite strands are cooled and chopped into pellets.

Pultrusion is dramatically different than the process used to manufacture short fiber thermoplastics (SFT) where chopped fiber is melt-blended with plastic resin using conventional extrusion compounding methods. The fiber length in a SFT pellets is typically less than 1 mm while in LFT pellets fiber length is up to 1/2 inch.

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