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Preparation method of ultra-thin and ultra-soft prepreg tows for automatic fiber laying

A technology of ultra-soft prepreg tow and automatic laying, which is applied in the direction of weight reduction, which can solve the problems of incomplete slitting, difficult slitting, and reduced slitting effect of wide-width prepregs, and achieves improved slitting Efficiency and width accuracy, simple preparation method, effect of reducing distortion

Active Publication Date: 2020-10-27
AVIC COMPOSITES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The polyester film is selected as the supporting material to support the wide-width prepreg. The polyester film and the wide-width prepreg pass through the traction roller of the slitting machine. The prepreg and the polyester film are bonded under the pressure of the traction roller. Together, so that no slippage occurs between the two. The wide prepreg passes through the automatic unwinding device and the traction device to enter the cutter for slitting. The slitting rate is 12m / min, the tension is set to 40% of the maximum tension, and the slitted prepreg tow is automatically wound and collected. volume. Observed by an optical microscope and a width measuring instrument, the edges of the prepreg tow are neat, without obvious wire breakage and split wire defects, and the width accuracy meets the requirements.

Embodiment 2

[0026] Before the wide-width prepreg passes through the automatic unwinding device and the traction device to enter the cutter, a cooling roll with general cooling water is used to cool the surface of the prepreg to reduce the surface temperature of the prepreg to 15°C. The wide-width prepreg after cooling is slit by a cutter, the slitting speed is 15m / min, the tension is set to 40% of the maximum tension, and the slitted prepreg tow is automatically wound and reeled. Observed by an optical microscope and a width measuring instrument, the edges of the prepreg tow are neat, without obvious wire breakage and split wire defects, and the width accuracy meets the requirements.

Embodiment 3

[0028] The polyester film is selected as the supporting material to support the wide-width prepreg. The polyester film and the wide-width prepreg pass through the traction roller of the slitting machine. The prepreg and the polyester film are bonded under the pressure of the traction roller. Together, so that no slippage between the two. Before the wide-width prepreg passes through the automatic unwinding device and the traction device to enter the cutter, the cooling roll of general cooling liquid is used to cool the prepreg surface to reduce the prepreg surface temperature to 15°C. After cooling, the wide-width prepreg is slit by a cutter. The slitting rate is 15m / min. The tension before slitting is set to 50% of the maximum tension. The tension adjustment roller is set to make the winding section tension approximately the maximum tension. 30%-40%, the prepreg tow obtained by slitting is automatically wound and reeled. Observed by an optical microscope and a width measuring ...

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Abstract

The invention relates to a preparation method of ultra-thin and ultra-soft prepreg tows for automatic fiber laying. The prepreg tows are epoxy resin-based or bismaleimide resin-based carbon fiber reinforced prepregs; and the method is characterized in that before the wide ultra-thin and ultra-soft prepreg tows are slit, a layer of stiff material film capable of being bonded with the prepreg tows is attached to the lower surfaces of the prepreg tows, the stiff material film playing a supporting role is slit together when the prepreg tows are slit by a cutter, the slit prepreg tows are automatically wound, and the slit material film is subjected to waste collection through automatic waste winding. According to the method, the prepreg tows with high edge quality and high width precision can be obtained, and the adverse effect of too thin and too soft prepregs on slitting is eliminated.

Description

Technical field [0001] The invention is a preparation method of ultra-thin and ultra-soft prepreg tow for automatic silk laying, which belongs to the preparation technology of prepreg. Background technique: [0002] Automatic prepreg wire laying technology uses narrow width unidirectional prepreg tow as raw material to lay on the surface of a mold with a specific shape. The advantages of high quality, high precision, high reliability and high efficiency have made prepreg automatic wire laying technology more and more widely used in the aerospace field. The preparation methods of the unidirectional prepreg tow used in the automatic laying technology mainly include the direct hot melt method and the slitting method. Because the width of the prepreg tow used for automatic laying is generally small, the direct hot-melt method is limited by the marginal influence, and its glue content and width are difficult to accurately control. In addition, its production efficiency is also low, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29B11/16B29C70/16
CPCB29B11/16B29C70/16Y02T50/40
Inventor 杜宇石峰晖张宝艳闫鸿琛
Owner AVIC COMPOSITES
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