Warp Streaks

A fabric fault that shows as bands or streaks running warpwise. Warp streaks should not be confused with reed marks.

Warp stretch

The amount of stretching sustained by warp yarn during sizing operations. It is usually expressed as a percentage of the original length of unsized warp.

Warp stripe (defect)

In woven fabric, a stripe that runs parallel to the warp threads and contains warp yarn that differs in material, linear density, filament, twist, lustre, tension or crimp, size, colour or shade from the adjacent normal warp.
note: The term 'stripe' implies that both edges of the faulty area are visible and that its length warp-way is appreciable.

Warp-backed fabric

A woven fabric that contains two sets of warp threads and one set of weft threads. One warp and the weft together form the face, while the second warp is laid at the back of the fabric and is stitched into it at intervals so as to form one structure, without distorting the surface appearance.

Warp-Drawing

See DRAW-WARPING. Warp-drawn fibers may be taken up on packages other than beams.

Warp-Knit Fabric

A fabric that is knit with the yarns running lengthwise e.g. tricot milanese and Raschel.

Warp-knitted

A three-bar construction made with full-set threading on each guide bar. The front and back bars make tricot lapping movements in opposition, while the middle bar lays-in over two needles in the same direction as the front bar. The middle bar is overfed so that its yarn is formed into an irregular pile.

Warp-knitted fabric

Fabric composed of knitted loops in which the yarns forming the loops travel in a warp-wisedirection down the length of fabric generally parallel to the selvedge. Part of the yam, between the loops which connect the wales together, is referred to as the underlap.
note: The two sides of the fabric are referred to as the technical face (the side on which the knitted loops are prominent) and the technical back (the side on which the underlaps are prominent).

Warp-protector motion

A mechanism provided to protect a warp from damage in the event of a shuttle being trapped in the shed (see trap). There are various types:
(i) mechanical:(a) a fast-reed stop motion that arrests the movement of the sley prior to beat-up;(b) a loose-reed stop motion (see loose reed);
(ii) electromagnetic (see electromagnetic warp protector).

Warper's beam

A beam on which yarn is wound in a warping machine.

Warping

Winding a part of the total number of ends of a warp in full width on to a back beam.

Warping creel

A creel for holding yarn packages, usually in tiers and from which an assembly of ends can be withdrawn for warp-making.

Warping lease

An additional lease at the beginning of a warp for use in 'gaiting-up' the loom harness and reed.

Warping mill

A machine used to make a warp. It has a large-diameter reel, which may be horizontal or vertical. On the horizontal mill, the warp is built up in sections (see section warping). On the vertical mill, a warp in the form of a rope is built up in stages and subsequently unwound as a ball warp.

Wash and wear

Descriptive of textile materials that are reasonably resistant to disturbance of fabric structure and appearance during wear and washing and require a minimum of ironing or pressing.