FORM 2
THE PATENTS ACT, 1970
(39 OF 1970)
&
THE PATENTS RULES, 2003
PROVISIONAL SPECIFICATION
[See section 10; Rule 13]
METHOD FOR TREATING THE WOVEN AND KNITTED FABRIC AND A SYSTEM THEREOF;
THE ARVIND MILLS LTD., A COMPANY
INCORPORATED UNDER THE
COMPANIES ACT, 1956, WHOSE ADDRESS IS NARODA ROAD, AHMEDABAD - 380 025, GUJARAT, INDIA
THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE NATURE OF THIS INVENTION
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FIELD OF THE INVENTION:
The present invention relates to a fabric and particularly to a woven and knitted fabric and more particularly to a woven and knitted fabric made from yarns spun from natural and/or synthetic fibers. Further, it relates to a system and method thereof.
BACKGROUND OF THE INVENTION:
Woven and knitted fabrics are widely used in diverse industries including apparels, work-wear, home linen, upholstery, bath, technical fabrics and the like.
Presently, woven and knitted fabrics are manufactured by weaving and knitting respectively by interlacing yarns, which are spun from natural and/or synthetic fibers. The woven and knitted fabrics manufactured by using conventional process by using dyed or gray yarns, which are subjected to finishing such as desizing and/or scouring, bleaching and dyeing if yarns used are gray and then washed, neutralized, compacted (stabilized) and then finally dried. However, these fabrics in the gray form have higher potential for shrinkage due to the stresses in the yarn and fibers. Thereby need compacting as a compulsory process wherein dimensions of the fabrics are reduced.
BRIEF DESCRIPTION OF THE DRAWINGS OF THE INVENTION:
The accompanying drawings illustrate the preferred embodiments of the invention and together with the following detailed description serve to explain the principles of the invention:
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Figure 1 shows a system for the manufacture of .a woven and knitted fabric
in accordance with an embodiment of the invention.
Figure 2 shows a flow chart listing the steps involved in the manufacture of a
woven and knitted fabric in accordance with an embodiment of the invention.
DETAILED DESCRIPTION OF THE INVENTION
An object of the present invention is to reduce shrink-ability of a woven and
knitted fabric.
Further object of the present invention is to reduce stresses induced in the
yarns of the woven and knitted fabric while spinning the fibers, weaving and
knitting the fabric.
According to the present invention, a method for treating the woven and
knitted fabric comprises steps of pre-wetting woven and knitted fabric and
then reorganizing fibers within the yarns of the woven and knitted fabric.
According to an embodiment of the present invention, the woven and knitted
fabric is pre-wetted by subjecting the woven and knitted fabric to a uniform,
high-density jet fluid.
According to an embodiment of the present invention, the reorganizing of the
fibers within the yarn is carried out by subjecting the wetted yarn of the fabric
to a uniform high-pressure jet fluid.
A system for practicing the invention comprises a woven and knitted fabric
un-winder for mounting a beam of the woven and knitted fabric; a pair of
rollers for drawing the woven and knitted fabric at a tension, and an
entanglement device wherein the drafted woven and knitted fabric is pre-
wetted and fibers in the yarn of the woven and knitted fabric are reorganized.
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According to an embodiment of the present invention, the system further
comprises a scray between the pair of rollers for easy material handling and
facilitating continuous running of the system.
According to an embodiment of the present invention, the entanglement
device comprises atleast one perforated drum for supporting woven and
knitted fabric, a pre-wetting jet means for wetting the woven and knitted
fabric and a jet means for impacting high density fluid atleast one side of the
fabric under controlled process energies to reorganize the fibers within yarns
of the woven and knitted fabric.
According to the present invention, the tension in the fabric can be adjusted
manually or automatically.
According to an embodiment of the present invention, the pre-wetting jet
means has high flow rate of fluid than the jet means.
According to another embodiment of the present invention, the pre-wetting
jet means impacts fluid at a higher pressure than the jet means.
According to further embodiment of the present invention, the perforated
drum may comprise a sleeve having perforations. The percentage of the
perforations on the drum with or without sleeve depends upon the woven
and knitted fabric to be treated, required properties of the end woven and
knitted fabric, use of the end fabric etc.
According to the present invention, the woven fabric is woven and knitted by
interlacing gray or dyed yarns and knitted fabric is prepared by intermeshing
gray or dyed yarn.
According to further embodiment of the present invention, the reorganized
fabric can be combined with non-woven, woven and knitted fabric and/or
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fibers for entanglement with the help of hydro entanglement process to form a composite fabric or dried.
Fig 1 and Fig 2 show a system (100) and a flow chart of method of the treatment according to the present invention respectively. As shown in Fig 1 and 2, a beam of the woven and knitted fabric (50) to be treated is mounted on the fabric un-winder (10)^ which unwinds the fabric in a scray (20) through feed rollers (30). The delivery rollers (40) draw the fabric (50) and supplies to the perforated drum (D1) where the fabric (10) is wetted initially by the water jet through an injector strip (60) to remove the air entrapped in the yarns of the woven and knitted fabric (50) and then wetted fabric is impacted with high pressure water by means of jet means (70). The said impaction causes reorganizing of the fibers in the yarn of the fabric (50). The reorganizing of the fibers within the yarn includes stress relaxation yarns in the fabric and in the fabric, stabilization of the fabric, repositioning of the fibers within the yarns of the fabric, pushing of the loose or loosely held fibers into yarn structure and results in blooming the yarn structure thereby increasing bulk and thickness of the fabric. Further, free ends of the fibers are also entangled into one another thereby resulting in the generation of the fabric having clean and neat look. As shown in the Fig 1, the other surface of the fabric (50) can be further subjected to the high-pressure jet means (75) on another perforated drum (D3).
The reorganized fabric is then dried and wound on a beam as shown in Fig 1. Alternatively, the reorganized fabric can be combined with non-woven, woven and knitted fabric and/or fibers for entanglement with the help of hydro entanglement process to form a composite fabric, which further dried
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and wound on a beam. The said fabric further process to obtained finished
product such as in case of gray fabric the fabric is desized, scoured,
bleached and dyed.
It will readily be appreciated by those skilled in the art that the present
invention is not limited to the specific embodiments herein shown. Thus
variations may be made within the scope and spirit of the accompanying
claims without sacrificing the principal advantages of the invention.
Dated this 29th day of March, 2007

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