Warp and weft
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In the manufacture of
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
Warp
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
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
- ^ "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.
- ^ Burnham (1980), pp. 170, 179
- ^ Barber (1991), p. 79.
- ^ ISBN 978-0-85263-545-2.
- ^ "warp | Search Online Etymology Dictionary". www.etymonline.com. Retrieved 2018-02-26.
- ^ "Warp | The George Washington University Museum and The Textile Museum | The George Washington University". museum.gwu.edu. Retrieved 2017-08-10.
- ^ Burnham (1980), p. 132
- ^ Weaving in the Peruvian Highlands, Nilda Callanaupa Alvarez
- ^ "warp and woof". Dictionary.com. Retrieved 14 July 2023.
References
- Barber, E. J. W. (1991). Prehistoric Textiles. Princeton University Press. ISBN 0-691-00224-X.
- ISBN 0-88854-256-9.