Warp and weft

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Warp and weft in plain weaving. See weaving for other weave pattens, such as twill. Warp and weft 2.jpg
Warp and weft in plain weaving. See weaving for other weave pattens, such as twill.
The yellow yarn is the pile, the vertical the warp, and the horizontal the weft

In the manufacture of cloth, warp and weft are the two basic components in weaving to transform thread and yarn into textile fabrics. The vertical warp yarns are held stationary in tension on a loom (frame) while the horizontal weft (also called the woof) is drawn through (inserted over and under) the warp thread. [1] In the terminology of weaving, each warp thread is called a warp end (synonymous terms are fill yarn and filling yarn); a pick is a single weft thread that crosses the warp thread. [2] [3]

Contents

In the 18th century, the Industrial Revolution facilitated the industrialisation of the production of textile fabrics with the "picking stick" [4] and the "flying shuttle", which was invented by John Kay, in 1733. The mechanised power loom was patented by Edmund Cartwright in 1785, which allowed sixty picks per minute. [4]

Etymology

The word weft derives from the Old English word wefan, to weave. Warp means "that across which the woof is thrown". (Old English wearp, from weorpan, to throw, cf. German werfen, Dutch werpen). [5]

Warp

Warped loom. Warp is wrapped onto the warp beam; as the cloth is made, the fell (woven part) is wrapped onto the breast beam next to the weaver. Loom (PSF).png
Warped loom. Warp is wrapped onto the warp beam; as the cloth is made, the fell (woven part) is wrapped onto the breast beam next to the weaver.
Wrapping the warp threads around the warp beam of a loom in preparation for weaving. Raiyani muharramah- Wanita suku badui luar DSCF2861.jpg
Wrapping the warp threads around the warp beam of a loom in preparation for weaving.
Warp threads in tablet weaving Tablet-weaving.svg
Warp threads in tablet weaving

The warp is the set of yarns or other things stretched in place on a loom before the weft is introduced during the weaving process. It is regarded as the longitudinal set in a finished fabric with two or more sets of elements. [6]

The term is also used for a set of yarns established before the interworking of weft yarns by some other method, such as finger manipulation, yielding wrapped or twined structures. Very simple looms use a spiral warp, in which the warp is made up of a single, very long yarn wound in a spiral pattern around a pair of sticks or beams. [7]

The warp must be strong to be held under high tension during the weaving process, unlike the weft which carries almost no tension. This requires the yarn used for warp ends, or individual warp threads, to be made of spun and plied fibre. Traditionally wool, linen, alpaca, and silk were used. However, improvements in spinning technology during the Industrial Revolution created cotton yarn of sufficient strength to be used in mechanized weaving. Later, artificial or man-made fibres such as nylon or rayon were employed.

While most weaving is weft-faced, warp-faced textiles are created using densely arranged warp threads. In these the design is in the warp, requiring all colors to be decided upon and placed during the first part of the weaving process, which cannot be changed. Such limitations of color placement create weavings defined by length-wise stripes and vertical designs. Many South American cultures, including the ancient Incas and Aymaras, employed backstrap weaving, which uses the weight of the weaver's body to control the tension of the loom. [8]

Weft

Because the weft does not have to be stretched on a loom the way the warp is, it can generally be less strong. It is usually made of spun fibre, originally wool, flax and cotton, today often of synthetic fibre such as nylon or rayon.

The weft is threaded through the warp using a "shuttle", air jets or "rapier grippers". Handlooms were the original weaver's tool, with the shuttle being threaded through alternately raised warps by hand.

As metaphor

The expression "warp and weft" (also "warp and woof" and "woof and warp") is used metaphorically the way "fabric" is; e.g., "the warp and woof of a student's life" equates to "the fabric of a student's life". [9] Warp and weft are sometimes used even more generally in literature to describe the basic dichotomy of the world we live in, as in, up/down, in/out, black/white, Sun/Moon, yin/yang, etc. The expression is also used similarly for the underlying structure upon which something is built. The terms "warp" and "woof" are also found in some English translations of the Bible in the discussion of mildews found in cloth materials in Leviticus 13:48-59.

See also

Notes

  1. "Weft". The George Washington University Museum and The Textile Museum. Washington, DC: George Washington University. Archived from the original on 2017-08-10. Retrieved 2017-08-10.
  2. Burnham (1980), pp. 170, 179
  3. Barber (1991), p. 79.
  4. 1 2 Aspin, Chris (1981). The Cotton Industry. Shire Library. p.  20. ISBN   978-0-85263-545-2.
  5. "warp | Search Online Etymology Dictionary". www.etymonline.com. Retrieved 2018-02-26.
  6. "Warp | The George Washington University Museum and The Textile Museum | The George Washington University". museum.gwu.edu. Retrieved 2017-08-10.
  7. Burnham (1980), p. 132
  8. Weaving in the Peruvian Highlands, Nilda Callanaupa Alvarez
  9. "warp and woof". Dictionary.com. Retrieved 14 July 2023.

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A loom is a device used to weave cloth and tapestry. The basic purpose of any loom is to hold the warp threads under tension to facilitate the interweaving of the weft threads. The precise shape of the loom and its mechanics may vary, but the basic function is the same.

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The manufacture of textiles is one of the oldest of human technologies. To make textiles, the first requirement is a source of fiber from which a yarn can be made, primarily by spinning. The yarn is processed by knitting or weaving, which turns yarn into cloth. The machine used for weaving is the loom. For decoration, the process of colouring yarn or the finished material is dyeing. For more information of the various steps, see textile manufacturing.

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<span class="mw-page-title-main">Warp-weighted loom</span> Ancient form of loom In which the warp threads hang vertically and are held taut with weights

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