Method for extruding and forming short fiber reinforced-rubber composite material in radial direction

Abstract

The invention relates to a short fiber reinforced rubber composite material radial orientation extrusion molding method and the procedures are as follows: at first, rubber molten mass containing short fiber is carried out with the extrusion processing in an extruder; at the end of the screw rod in the extruder tube, the rubber is extruded into an axial orientation channel, the flow direction of the rubber mass is adopted for orientation, and the axial orientation of the short fiber is realized in the axial orientation channel of a machine head; the rubber mass which goes through the axial orientation passes through a resistance dam formed by contracting the thickness of the channel under the function of extrusion pressure; the rubber is characterized by extrusion swelling, so the short fiber is inclined owing to rolling over after the rubber mass passes through the resistance dam; the expanded rubber mass keeps flowing along the channel, the inclined degree of the part in middle and at edge is increased owing to velocity gradient, the radial orientation of the short fiber is increased and then the radial orientation is realized. The method of the invention has the advantages of simple and easily-controlled technique procedures, wide application range, good radial orientation quality of products, and low cost.

Description

Technical field: [0001] The invention relates to a radial orientation extrusion molding method of short fiber reinforced rubber composite material, in particular to a short fiber reinforced rubber continuous extrusion molding and realizes radial orientation extrusion molding of short fibers in rubber material during the extrusion process Methods. Background technique: [0002] Short fiber-rubber composites are one of the ideal materials for preparing high-performance tires. Studies have found that adding short fibers to the rubber compound can significantly reduce the rolling resistance, wet skid resistance and hysteresis loss of the tire, and improve the tear resistance and chipping resistance of the tread, which can reduce the weight of the tire and make the tire more durable. Driving noise is reduced. If the short fibers are radially oriented in the rubber compound, the overall rigidity of the tire can be improved, and the balance handling, ride comfort and tire wear re...

AI Technical Summary

Problems solved by technology

How to orient the short fibers in the radial direction, many researchers at home and abroad have conducted extensive research. At present, the main solutions are as follows: first, use the rubber compound with the short fibers extruded by the ordinary machine head to be oriented in the circumferential direction, and punch it into The cross-sectional shape of the tread, and then piece by piece to the required tread length, this method is very inefficient and only suitable for experimental research, and it cannot be applied to actual production at present; the second is to change the structure of the nose and mouth The method directly extrudes the short fiber radially oriented rubber tube, then cuts it longitudinally, and then cuts it according to the width required by the part along the extrusion direction. method to be used in tire production, but there are many difficulties

Because the tire tread is a product with a certain shape and specifications, if the rubber tube is extruded, it must be cut and spliced ​​again. The operation is cumbersome, the production efficiency is low, and it will also affect the tire building process.

If the tread is directly extruded, the mouth size must be equivalent to the outer diameter of the tire. The mouth shape is huge, and the size of the extruder is huge, which brings great difficulties to mechanical manufacturing and is almost difficult to achieve. In addition, the composite tread Production is even more impossible to achieve

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