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Granulation method of glass fiber reinforced thermoplastic

 There are three kinds of granule production methods, namely, single screw extruder, single screw exhaust extruder and exhaust twin-screw extruder. This paper mainly introduces the third method.

 
According to the different feeding methods, there are two granulation methods in exhaust twin-screw extruder. One is that the resin and chopped glass fiber are respectively added into two feeding funnels of the exhaust twin-screw extruder, and the resin and fiber are fed into the barrel through the feeding screw. In the barrel, the fiber and resin are evenly mixed, and the volatile matter in the mixture is removed through the exhaust section. After further molding, the strip is extruded through the die, and then cooled and dried, and then cut into pellets, Commonly known as staple fiber method.
 
The other method is to add the resin and fiber (usually the ply yarn) into the resin feeding funnel and wire inlet of the exhaust twin-screw extruder, and the glass fiber is broken by the left-hand screw and kneading device. The latter process is the same as the short cutting method, commonly known as the long fiber method. The former method can be controlled by the rotation speed of the feeding screw; the latter method can be controlled by adjusting the number of glass fiber strands fed into the extruder and the screw speed in the barrel. The twin-screw extruder can effectively plasticize the resin and even compound with the fiber.

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