Shed (weaving)

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The shed, the triangular aperture on the far right, shown from the back of a table loom LoomShedRearView.jpg
The shed, the triangular aperture on the far right, shown from the back of a table loom
Passing the shuttle through the shed Belarus weaving.jpg
Passing the shuttle through the shed
The shed shown in tablet weaving Tablet-weaving.svg
The shed shown in tablet weaving

In weaving, the shed is the temporary separation between upper and lower warp yarns through which the weft is woven. The shed is created to make it easy to interlace the weft into the warp and thus create woven fabric. Most types of looms have some sort of device which separates some of the warp threads from the others. This separation is called the shed, and allows for a shuttle carrying the weft thread to move through the shed perpendicular to the warp threads. Which threads are raised and which are lowered are changed after each pass of the shuttle. [1]

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The process of weaving can be simplified to a series of four steps: the shed is raised, the shuttle is passed through, the shed is closed, and the weft thread is beaten into place. These steps are then repeated, with a different set of threads being raised so as to interlace the warp and weft. [1]

The term shedding refers to the action of creating a shed. [2] A shedding device is the device used to raise or open the shed. Creating the separation is referred to as raising or opening the shed, while the reverse is known as lowering or closing the shed.

Shedding device

An Inkle loom CMP Inkle weaving.jpg
An Inkle loom

The type of device that is used to raise and lower the shed differs on the type of loom. With a tablet loom the sheds are raised and lowered by rotating the tablets, or cards. In a floor loom the shed is created by the harnesses. Inkle looms have one of the more primitive shedding devices, where there is one set of heddles and the shed is created by hand.

A backstrap loom with a shed-rod. Backstrap loom.jpg
A backstrap loom with a shed-rod.

Originally there was no shed, and the weft was inserted into the warp by picking the warp threads up individually, as is done in tapestry weaving. After each weft thread is woven the warp threads had to be picked out and lifted again, which made the process slow. To speed up the process various devices were developed to create a reproducible shed, so that the weft could be passed between the separated threads, and so the threads would not have to be separated individually each time. The first type of shedding device was called a shed-rod. It was a rod inserted into the warp to ease in weaving, and came about at the same time as the heddle. Threads were alternated over and under the rod, and the threads that went under the rod went through string heddles attached to a bar. The shed was created in two ways: by raising the shed-rod, and by lifting the heddles. [3] The shed-rod was an invention of eastern origin, and was introduced to Europe via Egypt in the first century AD. The Romans used it for both plain weave and twill. [4]

After the shed-rod came the rigid heddle loom, where the shed is created by raising or lowering the rigid heddle. As the loom progressed, the shed-rod was replaced by a second set of heddles, for a total of two shafts with heddles. Eventually looms like the modern floor loom were developed, where there are many shafts which can be raised to create the shed. [3]

Rising shed loom

Two different shedding methods were developed for the harness loom-one where any one harness or combination of harnesses was lifted while the other harnesses remained stationary. [3] This type of loom is known as a rising shed loom, and examples include the table loom, dobby loom or the Jack loom. [5] The other method used in harness looms is where some harnesses are raised while others are lowered. The second method lessened the effort of lifting the selected harnesses because they no longer needed to be raised as high as in a rising shed loom. [3] Counterbalance and countermarch looms are of this second type.

Poor shed

Clearing a poor shed Weaving demonstration (cropped).jpg
Clearing a poor shed

There are many things that can cause the warp threads not to separate cleanly, and thus produce a poor shed. A slack warp, threads set too closely in the reed, or increase of friction on the first foot or so of the warp where the threads were handled all cause poor sheds. [5] Fuzzy yarns like mohair can also cause a poor shed. [1] To get a better shed the weaver can lift the harnesses while the reed is against the fabric, [1] [5] or raise only one harness at a time. By weaving in a different manner sometimes a good shed can be created. [5] The weaver can also insert a stick into the shed to clear it, and make way for the shuttle though this option is time-consuming.

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<span class="mw-page-title-main">Loom</span> Device for weaving textiles

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.

<span class="mw-page-title-main">Weaving</span> Technology for the production of textiles

Weaving is a method of textile production in which two distinct sets of yarns or threads are interlaced at right angles to form a fabric or cloth. Other methods are knitting, crocheting, felting, and braiding or plaiting. The longitudinal threads are called the warp and the lateral threads are the weft, woof, or filling. The method in which these threads are interwoven affects the characteristics of the cloth. Cloth is usually woven on a loom, a device that holds the warp threads in place while filling threads are woven through them. A fabric band that meets this definition of cloth can also be made using other methods, including tablet weaving, back strap loom, or other techniques that can be done without looms.

<span class="mw-page-title-main">Power loom</span> Mechanised loom powered by a line shaft

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<span class="mw-page-title-main">Warp and weft</span> Two constituent threads of woven cloth

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A dobby loom, or dobbie loom, is a type of floor loom that controls all the warp threads using a device called a dobby.

<span class="mw-page-title-main">Damask</span> Reversible figured woven fabric

Damask is a reversible patterned fabric of silk, wool, linen, cotton, or synthetic fibers, with a pattern formed by weaving. Damasks are woven with one warp yarn and one weft yarn, usually with the pattern in warp-faced satin weave and the ground in weft-faced or sateen weave. Twill damasks include a twill-woven ground or pattern.

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Pile weave is a form of textile created by weaving. This type of fabric is characterized by a pile—a looped or tufted surface that extends above the initial foundation, or 'ground' weave. The pile is formed by supplemental yarn running in the direction of the length of the fabric or the width of the fabric. Pile weaves include velvet and corduroy fabrics and machine-woven Berber carpets.

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<span class="mw-page-title-main">Inkle weaving</span> Process of weaving narrow bands or ribbons using a handloom

Inkle weaving is a type of warp-faced weaving where the shed is created by manually raising or lowering the warp yarns, some of which are held in place by fixed heddles on a loom known as an inkle loom. Inkle weaving was referred to in Shakespeare's Love's Labour's Lost. A table-top inkle loom was patented by Mr. Gilmore of Stockton, CA in the 1930s but inkle looms and weaving predate this by centuries. The term "Inkle" simply means "ribbon" or "tape" and refers to any warp-faced woven good made on any type of loom, from backstrap to box-looms.

<span class="mw-page-title-main">Heddle</span> Loom component that acts as a weft passage

A heddle is an integral part of a loom. Each thread in the warp passes through a heddle, which is used to separate the warp threads for the passage of the weft. The typical heddle is made of cord or wire and is suspended on a shaft of a loom. Each heddle has an eye in the center where the warp is threaded through. As there is one heddle for each thread of the warp, there can be near a thousand heddles used for fine or wide warps. A handwoven tea-towel will generally have between 300 and 400 warp threads and thus use that many heddles.

Textile manufacturing is one of the oldest human activities. The oldest known textiles date back to about 5000 B.C. In order to make textiles, the first requirement is a source of fibre from which a yarn can be made, primarily by spinning. The yarn is processed by knitting or weaving to create cloth. The machine used for weaving is the loom. Cloth is finished by what are described as wet process to become fabric. The fabric may be dyed, printed or decorated by embroidering with coloured yarns.

<span class="mw-page-title-main">Reed (weaving)</span> Part of loom

A reed is part of a weaving loom, and resembles a comb or a frame with many vertical slits.. It is used to separate and space the warp threads, to guide the shuttle's motion across the loom, and to push the weft threads into place. In most floor looms with, the reed is securely held by the beater. Floor looms and mechanized looms both use a beater with a reed, whereas Inkle weaving and tablet weaving do not use reeds.

<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

The warp-weighted loom is a simple and ancient form of loom in which the warp yarns hang freely from a bar, which is supported by upright poles which can be placed at a convenient slant against a wall. Bundles of warp threads are tied to hanging weights called loom weights which keep the threads taut. Evidence of the warp-weighted loom appears in the Neolithic period in central Europe. It is depicted in artifacts of Bronze Age Greece and was common throughout Europe, remaining in use in Scandinavia into modern times. Loom weights from the Bronze Age were excavated in Miletos, a Greek city in Anatolia.

<span class="mw-page-title-main">Waffle fabric</span> Type of woven or knit fabric

Waffle fabric, also known as honeycomb fabric, has raised threads that form small rectangles. It can be made by either weaving or knitting. Waffle weave is a further exploitation of plain weave and twill weave which produces a three-dimensional effect. The combination of warp and weft floats creates the structure. It is woven partly on tabby areas surrounded by ridges of long floats. The weave consists of warp and weft floats arranged around a plain weave center. The warp and weft threads are interlaced and floating in a way that creates small square ridges and hollows in the fabric in a regular pattern.

References

  1. 1 2 3 4 Cartwright, Wendy (2007). Weave. Murdoch Books. pp. 8, 35. ISBN   1-74045-978-4 . Retrieved July 6, 2009.
  2. Lord, Peter Reeves; Mohamed, Mansour H. (1982). Weaving: Conversion of Yarn to Fabric. Woodhead Publishing. p. 368. ISBN   978-0-900541-78-0.
  3. 1 2 3 4 Albers, Anni (2003). On Weaving. Courier Dover Publications. pp. 24–26. ISBN   978-0-486-43192-5 . Retrieved July 6, 2009.
  4. Jenkins, David (2003). The Cambridge history of western textiles. Cambridge University Press. p. 193. ISBN   978-0-521-34107-3 . Retrieved July 6, 2009.
  5. 1 2 3 4 Chetwynd, Hilary (1989). The Weaver's Workbook. Macmillan. pp. 9, 40. ISBN   978-0-312-02120-7 . Retrieved July 6, 2009.