Textiles: manufacturing – Thread finishing – Fabrication-defabrication
Reexamination Certificate
2000-02-02
2001-10-16
Worrell, Danny (Department: 3741)
Textiles: manufacturing
Thread finishing
Fabrication-defabrication
C066S00100R
Reexamination Certificate
active
06301759
ABSTRACT:
BACKGROUND OF THE INVENTION
FIELD OF THE INVENTION
The subject of the invention relates to a process for producing a yarn, to a yarn which is produced in accordance with the process and to a textile portion or fabric which contains the yarn.
The properties of a textile portion or fabric are predominantly determined by the properties of the yarn from which the textile portion is formed. If the textile portion or fabric is an article of clothing, the comfort of wearing the textile portion is considered very important. Articles of clothing are produced from widely varying yarns. Also, different processes are used to produce a yarn. It is for example known that a certain degree of bulk and thus a relatively large volume can be imparted to a yarn by subjecting the yarn during the production process to a texturing operation, in particular to an air texturing operation.
The bulk of a yarn has the result that the yarn has a certain degree of elasticity transversely to the longitudinal direction. Such an elasticity is however relatively slight. If the textile portion is an article of clothing having regions to which relatively high pressures are applied by the part of the body of the person wearing the article of clothing, it would be desirable for those regions of the article of clothing to be such that they are elastically yielding.
The Published European Patent Application EP 0 024 211 A1 describes that an article of clothing, in particular a sock, is formed in the foot contact or sole region with a damping portion whereby the loading of the foot during for example a sporting activity is to be reduced. The foot sole region is in the form of terry towel loops. Such loops increase the expenditure during production and also result in an increased amount of space being required within a shoe.
SUMMARY OF THE INVENTION
It is accordingly an object of the invention to provide a process for producing a yarn which overcomes the above-mentioned disadvantages of the heretofore-known processes of this general type and which can be carried out with a relatively low expenditure. A further object of the invention is to provide a yarn which has an increased level of elasticity. Another object of the invention is to provide a textile portion which in particular has improved wearing properties.
With the foregoing and other objects in view there is provided, in accordance with the invention, a process for producing a yarn, which includes the steps of forming a knitted portion with a yarn for imparting a curl to the yarn with stitches of the knitted portion; subjecting the knitted portion to a setting treatment for setting the curl imparted to the yarn by the stitches of the knitted portion; and unraveling the knitted portion after the setting treatment.
With the objects of the invention in view there is also provided, a yarn, including a yarn body having a curl imparted on the yarn body by knitting the yarn body, setting the curl with a setting treatment, and unravelling the yarn body after the knitting and setting operations.
The structural configuration of the yarn, such as the configuration of the curl is determined by the knitting operation and in particular by the stitches of the knitted portion. Different types of stitches result in different types of curls, such that there is a relationship between a given type of stitches or knitting and a given type of curl.
Surprisingly it was found that a yarn which is produced by a procedure whereby firstly a knitted portion or knitted fabric is formed from a yarn and the knitted portion is subjected to a treatment by which the curl, curving, or crimp imparted to the yarn by the stitches of the knitted portion is set and after the setting step the yarn is undone again, can enhance the wearing comfort of an article of clothing made from the yarn. The yarn produced in that way is available for further processing. The process according to the invention provides a possible way of producing yarn which has an enhanced elasticity in the longitudinal direction of the yarn. The process can be carried out in a simple manner and requires only simple devices. The process according to the invention also affords the option of producing yarns of different configurations. Differing curls or crimps can be imparted to the yarns according to the configuration of the knitting and thus according to the stitches of the knitted portion. It is also possible to form different stitches within a knitted portion so that the yarn has portions with differing curls. The yarn may in particular be of a zigzag or meander-shaped configuration.
According to an advantageous mode of the invention, it is proposed that firstly at least a basic or main thread is twisted with at least one elastic thread. That procedure has the advantage that the yarn can be formed from threads with differing functionalities. The main thread has imposed thereon the curl which determines the appearance of the yarn.
According to a further advantageous mode of the invention, it is proposed that ELASTAN as the elastic thread is twisted with the main thread. ELASTAN is preferably a chemical fiber which is extremely stretchable and which after the removal of a tensile force returns substantially to the original state. ELASTAN are fibres of high polymers which contain at least 85% by weight of segmented polyurethanes. The elastic thread can also include a thread of synthetic polyisoprenes or high polymers which are produced by polymerisation of one or more dienes, possibly with the addition of one or more VINYL monomers. Preferably the elastic thread is ELASTAN with a denier (titer) of dtex 20 wound around with dtex 78/1PA.
In accordance with a still further advantageous mode of the invention, it is proposed that the elastic thread is a rubber thread, in particular a natural rubber. Alternatively it is proposed that the elastic thread is a bi-component fibre, in particular of polyamide and polyurethane.
In accordance with a another advantageous mode of the invention, it is proposed that a main thread which at least partially includes a natural material is twisted with an elastic thread. The main thread is advantageously a main thread which contains wool and/or cotton. The main thread which partially contains wool and/or cotton can also contain mixes of chemical threads or chemical fibers.
In accordance with a further advantageous mode of the invention, it is proposed that the main thread and the elastic thread are twisted at a rotary speed of up to 600 rotations or revolutions per meter. That affords an adequate twisting effect for the threads, while also ensuring that a minimum degree of curl of the yarn is made possible. Preferably the main thread and the elastic thread are twisted at a rotary speed or revolution frequency of between 150 and 250 revolutions per meter. In particular, the main thread and the elastic thread are preferably twisted at a rotary speed of about 200 revolutions per meter.
In order to ensure that during the twisting operation no yarn breakage or thread breakage occurs it is proposed that the main thread and the elastic thread are twisted with a prestressing of up to 10 g. Preferably the main thread and the elastic thread are twisted with a degree of prestressing of between 2 and 6 g, in particular between 3 and 4 g.
In accordance with a still further advantageous mode of the invention, it is proposed that a knitted portion in tape or band form is formed. A band-form knitted portion simplifies handling when it is subjected to a setting operation.
In accordance with another mode of the invention, it is proposed that a substantially tubular knitted portion is formed. The operation of producing a tubular knitted portion can be performed for example through the use of a circular knitting machine.
In accordance with a still further mode of the invention, it is proposed that prior to the setting operation the knitted portion is subjected to at least one cleaning and/or stain removing or detaching step. Such a preliminary treatment of the knitted portion prior to the setting operation has the advantage t
Kalde Franz-Josef
Langer Angela
Falke KG
Greenberg Laurence A.
Lerner Herbert L.
Stemer Werner H.
Worrell Danny
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