Composite Tape For Use In Tape Laying Machines

Abstract

A tape for use in automated tape laying machines that includes a multi-layer substrate composed of a plastic layer that includes at least one plastic film having an outer film surface and an inner film surface. The plastic film is adhered to a fibrous layer so that the inner surface of the fibrous layer is bonded to the inner film surface. An uncured composite material layer composed of a fibrous reinforcement and an uncured resin matrix is releasably adhered to either the plastic layer surface or the outer fiber layer surface to provide a tape suitable for use in an automatic tape layer.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates generally to automatic tape laying machines that are used to apply uncured composite material (prepreg) to molds during fabrication of composite parts. More particularly, the present invention is directed to the tape that is used in such machines.[0003]2. Description of Related Art[0004]Composite materials are widely used in applications where high strength and relatively low weight are required. A common procedure for forming composite parts involves applying a prepreg to a mold or other tooling to form an uncured part that is then cured using an autoclave or other suitable curing protocol.[0005]“Prepreg” is a term used in the composite industry to describe a composite precursor wherein one or more layers of fibrous reinforcement have been impregnated with uncured resin. The resulting pre-impregnated structure is typically stored for later use in fabricating the final cured composite struc...

AI Technical Summary

Benefits of technology

[0014]In accordance with the present invention, a tape is provided for use in an automated tape laying machines wherein the backing is a multi-layer substrate that is resistant to tearing, especially when the backing has been scored by the cutter blades. The multi-layer substrate backing also provides other desirable features, such as high temperature stability, moisture stability, differential release, clean slit edges and low weight.

Problems solved by technology

Stopping and restarting automated tape laying machines due to the breakage of the backing material is a costly and time-consuming operation.

One problem with paper-based backing materials is that they are subject to tearing, especially if they are scored during cutting of the prepeg layer.

The paper backing also tends to lose strength if moisture is absorbed when the tape is in storage or if in use and under tension.

Neither of these solutions has been entirely satisfactory.

A common problem with conventional paper based backing materials is that the resultant slit edge can be rough and contain fibrous debris that is subsequently deposited onto the uncured composite material as a contaminant.

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