weaving an der FOM Hochschule für Oekonomie & Management

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Lerne jetzt mit Karteikarten und Zusammenfassungen für den Kurs weaving an der FOM Hochschule für Oekonomie & Management.

Beispielhafte Karteikarten für weaving an der FOM Hochschule für Oekonomie & Management auf StudySmarter:

Seldom used Alternatives to Knotting and Splicing

 Wrapping

Beispielhafte Karteikarten für weaving an der FOM Hochschule für Oekonomie & Management auf StudySmarter:

Extra devices

Beispielhafte Karteikarten für weaving an der FOM Hochschule für Oekonomie & Management auf StudySmarter:

Summarize of Sectional Warping

Beispielhafte Karteikarten für weaving an der FOM Hochschule für Oekonomie & Management auf StudySmarter:

Twisting Machine

Beispielhafte Karteikarten für weaving an der FOM Hochschule für Oekonomie & Management auf StudySmarter:

Advantage of precision winding

Beispielhafte Karteikarten für weaving an der FOM Hochschule für Oekonomie & Management auf StudySmarter:

Parallel wound bobbins

Beispielhafte Karteikarten für weaving an der FOM Hochschule für Oekonomie & Management auf StudySmarter:

Defect Patterning/Ribbon Winding

Beispielhafte Karteikarten für weaving an der FOM Hochschule für Oekonomie & Management auf StudySmarter:

Linear density for twisted yarns (idealised)

Beispielhafte Karteikarten für weaving an der FOM Hochschule für Oekonomie & Management auf StudySmarter:

Summarize of Direct Warping

Beispielhafte Karteikarten für weaving an der FOM Hochschule für Oekonomie & Management auf StudySmarter:

Sectional Warping

Beispielhafte Karteikarten für weaving an der FOM Hochschule für Oekonomie & Management auf StudySmarter:

Creel

Beispielhafte Karteikarten für weaving an der FOM Hochschule für Oekonomie & Management auf StudySmarter:

Knotting and Splicing Devices

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Beispielhafte Karteikarten für weaving an der FOM Hochschule für Oekonomie & Management auf StudySmarter:

weaving

Seldom used Alternatives to Knotting and Splicing

 Wrapping

 An auxiliary yarn is needed.
 The two ends that have to be connected overlap and the additional piece of yarn is wrapped around.
 The repair adds thickness and stiffness to the yarn.
 This technique tends to cause problems in the
subsequent processes.
 E. g. it is suitable for yarns that are used in the tufting process. Tufting is a technique for producing carpets and high quality trunk linings.

weaving

Extra devices

 dust removal device (31), moves back and forth along one side of the winding machine..
 Device for avoiding patterning is placed at the top of the winding unit (24); compares the speeds of the drum and the bobbin. And adjusts the process.
 Waxing unit (27) applies wax uniformly evenly
 Circular magazine (30) is an optional device that can be used at machines without a material flow system; keeps some cops as a reserve.

weaving

Summarize of Sectional Warping

 The full warp is divided into several narrow warp sections.
 The sum of the widths of all warp sections is the full warp width.
 The warp sections are wound onto the winding drum side by side and one after another.
 The length and density of the yarns wound onto the winding drum are the same as the ones of the final warp.
 The final step is winding all yarns from the winding drumm onto the warp beam.
 This technology is mainly applied for patterned warps and warps made of different materials.
 It is most suitable for small lot sizes.
 In general sectional warping is more time-consuming.

weaving

Twisting Machine

 At the twisting machine each feeding bobbin with the assembled yarns is placed in a spindle pot and between each pot a separator is placed.
 A two-for-one twisting machines adds two twists per spindle rotation, one inside the tube and the second after leaving the hollow tube and before passing the yarn guide.
 In general the twisting direction is opposite to the previous twist direction. This creates a voluminous yarn. In contrast, twisting in the same direction as the fed yarns creates hard and stiff yarns.
 For weaving highly twisted yarns are used because a lot of stress is applied while processing.

weaving

Advantage of precision winding

gentle yarn treatment

no patterning

weaving

Parallel wound bobbins

 Parallel winding is the densest way of winding.
 Tubes with flanges are required for a stable bobbin build-up, especially because
those bobbins are usually used for smooth materials and special yarn (e.g. fancy yarn
and lurex yarn).
 Parallel wound bobbins are always produced by precision winding machines.

weaving

Defect Patterning/Ribbon Winding

 This defect may occur on random winding machines.
 Looks like a ribbon wrapped around the bobbin.
worse unwinding properties in subsequent processes since the yarn sloughs off in a bunch.
 Patterning also causes problems while dyeing.
 Most winding machines are equipped with anti-
patterning devices.
 They impact the traverse motion to keep it from winding layers at in integer ratio.

weaving

Linear density for twisted yarns (idealised)

 50 tex ×2
 double twisted yarn
 twisted yarn made of two yarns with a linear density of 50 tex each
 linear density of the twisted yarn: 100 tex
 20 tex ×3×2
 two three cord twists are twisted together
 six yarns of 20 tex each in total
 linear density of the twisted yarn: 120 tex

weaving

Summarize of Direct Warping

 A portion of the total number of warp threads is wound onto a warper’s beam.
 Process is repeated until several warper’s beams are produced.
 The total length of the yarns on all the warper’s beams is a multiple of the required warp length.
 The density of the yarns is a fraction of the final density
 The width of the flanged warper’s beams is equal to the width of the warp beam.
 The yarns on the warper’s beams are together transferred to produce the final warp beam. This process is called beam assembling.
 This technology is mainly applied for large lot sizes (mass-produced articles, standard goods) and particularly for single coloured patterns (at least for simple stripes).
 Sizing is frequently integrated in the process of direct warping.
 Direct warping needs creels with higher capacity than sectional warping.

weaving

Sectional Warping

 A sectional warping machine consists of
different three different units:

 creel
 winding drum
 beaming unit.
 The bobbins are placed on the creel, unwound and rewound onto the winding drum.

weaving

Creel

 The main task of the creel is holding the bobbins and providing the yarn. It
consists of several functional elements.
 The creels are equipped with broken thread stop motions and tensioning devices. The amount of bobbins that can be put on the creel is defined as creel capacity. Common creels can hold up to 800 bobbins. Besides the capacity the
creels differ in their equipment, size and handling.
 Modern creels are equipped with one tensioning unit per bobbin. Just like at the
yarn-tensioning devices at winding machines there are different options, for example disc tensioning devices. Their task is to keep the tension constant, especially in case of slippage.
 Depending on the creel type it is also equipped with bobbin changers, carried out
manually or automatically.
 Another important element is the broken thread stop motion. It is important to
stop the machine immediately when a yarn breaks. Otherwise the broken yarn
end is wound onto the beam/drum and is hard to find.

weaving

Knotting and Splicing Devices

They connect the yarn in case of
 breakage accidentally
 breakage caused deliberately because of
slubs, thick or thin spots.
 end of bobbin and connecting it to the next
one
 Spliced spots are less visible than knots,
independently from the type of fabric. For that
reason, almost all modern winding machines are
equipped with spicing devices.
 In general, splicing machines contain less moving parts and thereby require less maintenance.

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