A kind of preparation method of ultra-thin and ultra-soft prepreg tow for automatic laying

Abstract

The invention relates to a preparation method of ultra-thin and ultra-soft prepreg tow for automatic laying, wherein the prepreg tow is epoxy resin-based or bismuth resin-based carbon fiber reinforced prepreg, and is characterized in that: the method comprises the following steps: Before the wide, ultra-thin and ultra-soft prepreg tow is cut, a stiff material film that can be bonded to the prepreg tow is attached to the lower surface of the prepreg tow, and the prepreg tow is divided by the cutter. When cutting, it is cut together with the material film that plays a supporting role, and the prepreg tow after slitting is automatically wound and wound, and the material film after slitting is also automatically wound through waste for waste collection. The method of the invention can obtain the prepreg tow with high edge quality and high width precision, and eliminates the adverse effect on the slitting caused by the prepreg being too thin and too soft.

Description

technical field [0001] The invention relates to a preparation method of an ultra-thin and ultra-soft prepreg tow for automatic laying, which belongs to the prepreg preparation technology. Background technique: [0002] The prepreg automatic laying and forming technology uses narrow-width unidirectional prepreg tows as raw materials to lay on the surface of a specific shape mold. The advantages of high quality, high precision, high reliability and high efficiency make prepreg automatic laying and forming technology more and more widely used in the aerospace field. The preparation methods of unidirectional prepreg tow used in automatic laying and forming technology mainly include direct hot-melt method and slitting method. Since the width of the prepreg tow used for automatic laying is generally small, the direct hot-melting method is limited by the marginal influence, and its glue content and width are difficult to be accurately controlled. Large-scale application of silk f...

AI Technical Summary

Problems solved by technology

Ultra-thin and ultra-soft prepregs make it difficult for the general process parameters of slitting equipment to be directly used for slitting of such prepregs

Ordinary backing materials are difficult to provide sufficient support for this type of prepreg during slitting, so that this type of wide prepreg is easily deformed when it is under the pressure of the cutter, resulting in the prepreg being cut. Fiber pulling and wrinkling occur during the process, resulting in defects such as broken filaments and split filaments at the edge of the laying material, as well as a decrease in the width accuracy of the prepreg tow, and even the situation that the wide-width prepreg cannot be completely cut.

And as the cutting distance increases, the cutting effect will drop sharply