Long glass fiber reinforced polypropylene (PP) pedal for commercial vehicle

A foot pedal, long glass fiber technology, applied in the layout of pedals or ladders, vehicle components, transportation and packaging, etc., can solve the problems of difficult structural use, etc., achieve light weight, excellent corrosion resistance, and optimized enhancement effect. Effect

Inactive Publication Date: 2012-07-04
FAW GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the performance of reinforced plastics is related to fiber length, it is difficult to use for structural purposes when the fibers are short

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] (1) Glass fiber roving is used, and the glass fiber is passed through a die head that can be impregnated with thermoplastics through a traction device. The temperature of the die head is 200 °C, and the back pressure is 0.5 MPa. The roving is forced to disperse in the die head. Open, impregnated by molten resin, so that each fiber is fully covered with resin, after cooling, cut into 10mm longer pellets for later use; (2) Through CAE analysis and MFlow analysis, the pedal is designed to be thickened around , with a U-shaped groove in the middle and a structure that intersects with rigid straight sides, and the above-mentioned pellets are injected into the mold to process the pedals.

Embodiment 2

[0010] Glass fiber roving is used, and the glass fiber is passed through a die that can be impregnated with thermoplastics (die temperature 230°C, back pressure 2MPa) through the traction device. Impregnation, so that each fiber is covered with resin, after cooling, cut into 25mm longer pellets; because the fiber is completely surrounded by resin, the damage to the fiber by the screw during injection molding is minimized, and the final product maintains longer length. In the injection molding technology of long glass fiber reinforced polypropylene, the requirements for raw materials are high, and it is necessary to use a polypropylene resin with ultra-low melt viscosity, so that the glass fibers wrapped in it are subjected to less shear force during processing. During the preparation process, the long fibers are uniformly infiltrated into the plastic matrix, thereby achieving an optimized reinforcement effect. Unlike conventional short-fiber reinforcements, the part has longe...

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PUM

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Abstract

The invention relates to a long glass fiber reinforced PP (polypropylene) pedal for a commercial vehicle. The long glass fiber reinforced PP pedal is characterized in that a particular method includes: (1), glass fiber zero-twisted roving is adopted, glass fibers pass through a mold head capable of being soaked in thermoplastic plastics by the aid of traction equipment, the temperature of the mold head ranges from 200 DEG C to 230 DEG C, the back pressure of the mold head ranges from 0.5MPa to 2MPa, the zero-twisted roving is forcedly scattered in the mold head, and is soaked in melted resin, accordingly, each fiber is sufficiently covered by the resin, and the fibers are cut into longer granules with lengths ranging from 10mm to 25mm to be reserved after being cooled; and (2), the pedal is designed into a structure by the aid of CAE (computer aided engineering) analysis and MFlow analysis, the peripheral edge of the structure is thickened, a U-shaped groove is arranged in the middle of the structure, rigid straight edges of the structure are crossed, and the granules are filled in a mold so that the pedal is processed. The long glass fiber reinforced PP pedal has fine impact resistance, corrosion resistance and excellent low-temperature performances, is lighter in weight (lighter than an aluminum pedal by 40% at least) and low in cost (lower than the aluminum pedal by 20%), meets requirements of environment protection laws and regulations on automobiles (a product can be recycled), is high in production efficiency, can be applied onto automobiles in various types, and has extremely wide application prospect.

Description

technical field [0001] The invention relates to a long glass fiber reinforced polypropylene (PP) pedal for commercial vehicles, which belongs to the technical field of external component design of commercial vehicles. Background technique [0002] The pedal directly bears the weight of the driver getting on and off the car, which is not only a structural part, but also has certain decoration requirements. At present, the pedals of trucks are mostly made of aluminum pedals, which are expensive and cannot meet the requirements of weight reduction and cost reduction. During the manufacture of short fiber reinforced thermoplastics, fibers are damaged as they are mixed with resin in the extruder due to shear between the screw and barrel. The fiber that was originally 6 mm has a length of 0.2-1 mm (generally below 0.7 mm) in the pellet. Since the properties of reinforced plastics are related to fiber length, short fibers are difficult to use for structural purposes. To remedy t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60R3/00B29C70/06
Inventor 李菁华杨兆国金文杰刘敏罗浩丛穆张鲁平
Owner FAW GROUP
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