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The compounding process to manufacture glass filament reinforced thermoplastic pellets is essentially the same as that for un-reinforced or filled thermoplastic compounds. Twin-screw extruders are generally used for higher throughput and thorough mixing. In this case, the chopped strands are introduced into the melt through a side feeder positioned as far down the twin screw extruder as possible, in order to achieve the highest residual filament length in the compound. The main difference with un-reinforced or filled thermoplastic compounding is the treatment of the screw to limit its wear. The screw profile will also be optimized for glass filament thermoplastic compounding, more particularly in terms of the mixing forces after the introduction of the chopped strands. The barrel temperature is increased by 10 to 30°C over that for un-reinforced thermoplastic compounding because of higher melt viscosity. The injection molding process for glass filament reinforced pellets is identical to that for un-reinforced or filled thermoplastics. Here again, the main differences will be in the treatment of the screw to limit its wear, and a 10 to 30°C higher barrel temperature compared to un-reinforced thermoplastic compounds because of higher melt viscosity.
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Chopped strands for thermoplastics  Asia
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