Short fiber feeding device for fiber reinforced thermoplastic plastics screw extruding machine

Abstract

The invention discloses a chopped fiber feeder of the screw extruder which includes the hopper, the motor, the gearbox, the roller with the open slot and the fiber stirring device. The motor fixed on the supporting frame is connected to the gearbox which is connected to the roller by the axis. The roller located in the bottom of the hopper matches with the open slot. It can control the addition and the adding speed of the chopped fiber by controlling the speed of the roller and the roller or the hopper open slot. So it can protect the completeness of the chopped fiber.

Description

technical field [0001] The invention relates to the field of screw extruded plastic processing, in particular to a short fiber feeding device of a fiber reinforced thermoplastic screw extruder. Background technique [0002] Screw extrusion devices are widely used in petroleum, chemical industry, home appliances, food processing, polymer filling modification and reaction extrusion and other industrial occasions. Fiber reinforced thermoplastic FRTP (fiber reinforcethermoplastic) is processed through a screw extrusion device, and fiber is added to the raw material to prepare a reinforced modified plastic. Compared with ordinary plastics, the mechanical properties and heat resistance of fiber-reinforced thermoplastics are greatly improved, and in some aspects meet or exceed the properties of metal materials. Existing screw extruders for processing fiber-reinforced thermoplastics mainly include single-screw extruders and twin-screw extruders. There are...

AI Technical Summary

Problems solved by technology

This also makes the price of short fiber reinforced thermoplastics high

[0004] On the other hand, since the short fiber and the raw material pass through the three parts of feeding, compression, and extrusion together, the resin raw material changes from solid to viscous state. In this process, the viscosity of the mixture increases significantly due to the addition of fibers, thus making the raw resin The melting process slows down, resulting in low output, high energy consumption per unit output, and equipment wear and tear.

Especially when the resin in the screw compression part of the extruder is gradually melted under the action of abrasion force, the high-strength shear will cause some fibers to break excessively and affect the strength of the product

If special fibers such as carbon fibers with high modulus and poor shear resistance are used, the performance of the product will decline more significantly during the processing

Generally speaking, it is difficult to add raw materials such as short fibers and resins together, and it must be surface treated, resulting in high cost, affecting the production process, and affecting the strength of the product.

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