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What is warp and weft in composite fiber fabrics?

asked 2016-05-29 13:33:37 -0500

Conrad_Marr gravatar image

What is warp and weft in a fabric?

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answered 2016-05-29 13:35:32 -0500

updated 2016-05-29 13:36:47 -0500

The fabric pattern, or construction, is an x-y co-ordinate system. The y axis represents the long axis of the fabric roll and is known as the warp direction. The x axis in the width of the roll is known as the fill or weft direction.

A weave is described as “balanced” if the same yarn and weight are used in both directions. There are basically three styles of weave used in the composites industry. They are the plain, twill and satin weaves. The plain weave consists of the warp and weft yarns going over and under one another, resulting in an equal amount of each on either side of the fabric. The curvature, or deformation, arising as a result of the weaving is known as crimp. The application of a tensile load in the plane of the fabric will tend to straighten out the crimp, manifesting itself as a reduction in strength and stiffness when compared to a unidirectional tape of the same material. An obvious way to increase the fabric’s stiffness is to reduce the amount of crimp by having the fibres as straight as feasible. Twill weave is a variation of the plain weave in which the warp and weft yarns are paired, 2 up and 2 down (or 4 up and 4 down). Satin weaves are a family of constructions with a minimum of interlacing. In these weaves the weft yarns periodically skip over several warp yarns. The length of yarn between the crimped intersections is known as the float. The numerical value preceding the “HS” descriptor is always one greater than the number of warp yarns over which the weft yarn passes before crimping under a single warp yarn. The weaves obviously appear different depending on which side is viewed.

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Asked: 2016-05-29 13:33:37 -0500

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Last updated: May 29 '16