Warp and weft

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Warp and weft are the two basic parts of weaving. The warp are the vertical threads stretched under tension on a loom. The weft (also called the woof) is the horizontal thread that is woven through the warp, going over and under.

Warp ends are the warp threads; a pick is one weft thread that crosses the warp. In weaving, the loom keeps the warp steady while the weft is inserted to build the fabric. The warp is the long set of threads under tension, and the weft carries little tension.

History and how weaving sped up: In the 18th century, the Industrial Revolution boosted fabric production. The flying shuttle, invented by John Kay in 1733, allowed wider fabrics to be woven faster. Edmund Cartwright patented the mechanized power loom in 1785, which could do about sixty picks per minute.

Materials: The warp must be strong, so it’s usually made from spun and plied fibers. Traditionally these were natural fibers like wool, linen, alpaca, and silk. After spinning improvements during the Industrial Revolution, cotton yarn became common for mechanized weaving, and later synthetic fibers such as nylon and rayon were used.

Weave types and color: Most weaving is weft-faced, but warp-faced fabrics exist as well. In warp-faced fabrics the warp threads dominate the surface, so the colors are chosen early and can’t be changed much. Weft-faced fabrics show the weft on the surface, allowing more color variation with each weft pass.

Techniques and tools: The weft is inserted through the warp using a shuttle, air jets, or rapier devices. Handlooms used to weave with a shuttle threaded through alternately raised warps. Backstrap weaving is traditional in many cultures, including the Incas and Aymaras, where the weaver’s body weight helps control the loom’s tension.

Metaphor and other uses: The expression warp and weft is used to describe the basic structure of something, or the “fabric” of life.

In summary, warp is the strong vertical foundation, and weft is the horizontal thread that fills the fabric. Together they create the vast variety of woven textiles we use every day.