U.S. patent application number 10/475401 was filed with the patent office on 2004-07-08 for composite twisting and production method therefor, and woven fabric and knitted fabric using the composite twisting.
Invention is credited to Morikawa, Yasumichi.
Application Number | 20040128973 10/475401 |
Document ID | / |
Family ID | 11737275 |
Filed Date | 2004-07-08 |
United States Patent
Application |
20040128973 |
Kind Code |
A1 |
Morikawa, Yasumichi |
July 8, 2004 |
Composite twisting and production method therefor, and woven fabric
and knitted fabric using the composite twisting
Abstract
A composite twist yarn is produced by twisting a spun yarn and
at least one filament together. The composite twist yarn has
features that the twisted direction of the composite twist yarn is
substantially identical to the twisted direction of the spun yarn
entwined in the composite twist yarn, and that the number of twists
of the composite twist yarn is larger than that of the spun yarn
entwined in the composite twist yarn. The composite twist yarn is
produced by making a twisted spun yarn and at least one filament
parallel to each other to a paralleled yarn, twisting the
paralleled yarn in a direction reverse to the twisted direction of
the spun yarn, and continuing the twisting over an untwisted point
of the spun yarn.
Inventors: |
Morikawa, Yasumichi;
(Fukuyama-shi, JP) |
Correspondence
Address: |
CASELLA & HESPOS
274 MADISON AVENUE
NEW YORK
NY
10016
|
Family ID: |
11737275 |
Appl. No.: |
10/475401 |
Filed: |
October 22, 2003 |
PCT Filed: |
April 24, 2001 |
PCT NO: |
PCT/JP01/03539 |
Current U.S.
Class: |
57/238 |
Current CPC
Class: |
D02G 3/28 20130101; D02G
3/32 20130101 |
Class at
Publication: |
057/238 |
International
Class: |
D02G 003/02; D02G
003/36 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 1, 1999 |
JP |
11-311485 |
Claims
1. A composite twist yarn comprising: a spun yarn and at least one
filament, the spun yarn and the filament being twisted with each
other, the twisted direction of the composite twist yarn being
substantially identical to the twisted direction of the spun yarn
entwined in the composite twist yarn, and the number of twists of
the composite twist yarn being larger than the number of twists of
the spun yarn entwined in the composite twist yarn.
2. The composite twist yarn of claim 1, wherein the filament
includes an elastic filament.
3. A method for producing a composite twist yarn comprising the
steps of: making a spun yarn twisted in one direction and at least
one filament parallel to each other to produce a paralleled yarn;
twisting the paralleled yarn in a direction reverse to the twisted
direction of the spun yarn; and continuing the twisting in the
reverse direction over an untwisted point of the spun yarn.
4. The method of claim 3, wherein the filament includes an elastic
filament.
5. A woven fabric comprising at least part of a warp yarn and a
weft yarn made of the composite twist yarn of any one of claims 1
and 2.
6. A knitted fabric comprising at least part of a warp yarn and a
weft yarn made of the composite twist yarn of any one of claims 1
through 3.
Description
TECHNICAL FIELD
[0001] The present invention relates to a novel composite twist
yarn, a production method for composite twist yarn, and to a woven
fabric and a knitted fabric using the composite twist yarn.
BACKGROUND ART
[0002] The following yarns are known as primary composite yarns in
which spun yarns and filaments are combined with each other:
[0003] (1) a core yarn constructed such that a cotton-like
substance (lump of staples) covers a core yarn consisting of a
filament or filaments, and the entirety is twisted;
[0004] (2) a single-covered yarn (a double-covered yarn)
constructed such that a single layer (a multi layer) of spun yarn
is entwined around a core yarn consisting of a filament or
filaments; and
[0005] (3) a plied yarn constructed such that two or three spun
yarns and at least one (usually, one) filament are twisted with
each other.
[0006] Among the above, the core yarn (1) has features that the
spun yarn is exposed over the entirety of the core yarn, has a good
texture, warm appearance and touch, and is categorized into a
high-quality yarn. However, in producing the core yarn using a
cotton spun yarn, it is required to secure a yarn strength by
enhancing entwining of the fibers. Accordingly, it is desirable to
use relatively long fibers exclusively as a material for the cotton
spun yarn by sorting out and excluding relatively short fibers,
which may lead to an exceedingly low yield of raw cotton or the
like. Further, this method necessitates a sophisticated technique
and facility to cover the core part of filament(s) with the spun
yarn, and accordingly may raise the cost of a resultant composite
yarn. In addition, production of core yarns of a fine count is
extremely difficult in light of the constraint on production.
[0007] The covered yarn (2) is the one in which a spun yarn is
entwined around the filament or filaments. The covered yarn has a
great yarn strength, good appearance and touch. However, since it
is required to entwine a singe layer or a multi layer of the spun
yarn around the filament(s), productivity of the covered yarn (2)
as a composite yarn is low.
[0008] Since the plied yarn (3) is usually produced by making two
or three spun yarns and a filament parallel to each other to a
paralleled yarn, and twisting the paralleled yarn, sorting of raw
cotton (removal of staples), which is required in production of the
core yarn (1), is not necessary, and hence productivity of the
plied yarn (3) as a composite yarn is high. Nevertheless, since the
plied yarn (3) is the one in which the spun yarns and the filament
are tightly twisted together, the plied yarn (3) has a stiff
texture as a composite yarn and fails to provide a warm appearance
and touch.
[0009] The present invention has been accomplished in view of the
above problems residing in the prior art. A first object of the
present invention is to provide a composite twist yarn having an
improved texture, superior (warm) appearance and touch by focusing
on a plied yarn that does not require sorting of raw cotton and is
effective in providing a high yield and productivity as a composite
yarn, to establish a novel method capable of easily producing such
a composite twist yarn even with a fine count, and to provide a
woven and knitted fabric having a superior appearance and touch
with use of such a composite twist yarn.
[0010] Another object of the present invention is to provide a
technology that enables to easily produce, with use of a twisting
facility and at a low cost, a composite twist yarn which has a
substantially equivalent or superior quality to the expensive core
yarn produced by the conventional complex spinning facility.
DISCLOSURE OF THE INVENTION
[0011] An inventive composite twist yarn that solves the above
problems is a composite twist yarn comprising a spun yarn and at
least one filament, the spun yarn and the filament being twisted
with each other, the twisted direction of the composite twist yarn
being substantially identical to the twisted direction of the spun
yarn entwined in the composite twist yarn, and the number of twists
of the composite twist yarn being larger than the number of twists
of the spun yarn entwined in the composite twist yarn.
[0012] Preferably, use of an elastic filament as the filament in
the composite twist yarn is extremely advantageous in providing the
composite twist yarn with an elasticity, as well as in terms of
appearance and touch.
[0013] Another aspect of the present invention is directed to a
method for producing a composite twist yarn having the above
superior properties. The method comprises making a twisted spun
yarn and at least one filament parallel to each other to a
paralleled yarn, twisting the paralleled yarn in a direction
reverse to the twisted direction of the spun yarn, and continuing
the twisting in the reverse direction over an untwisted point of
the spun yarn.
[0014] The inventive composite twist yarn has a great yarn
strength, superior texture, appearance, and touch. Accordingly, a
woven fabric and a knitted fabric produced with use of at least
part of the inventive composite twist yarn has also a superior
texture, appearance, and touch. Such a woven fabric and a knitted
fabric are embraced in the scope of the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS
[0015] FIGS. 1 through 4 are illustrations showing a composite
twist yarn and a method for producing the composite twist yarn
according to an embodiment of the present invention.
[0016] FIG. 5 is an illustration explaining a relation between a
change in a twisted direction and the number of twists with respect
to a spun yarn and a paralleled yarn used as a raw material in
implementing the present invention, wherein the spun yarn is
denoted at B, and a filament for the paralleled yarn is denoted at
M.
BEST MODE FOR CARRYING OUT THE INVENTION
[0017] In view of the above problems residing in the prior art, the
present inventors have made a research and development from various
viewpoints concerning a composite twist yarn which has the merits
of the plied yarn (3): no need of sorting of raw cotton, securing a
high yield, and feasibility in production, which has overcome the
demerits of the plied yarn: stiff texture, and poor appearance and
touch, and which is capable of producing a sophisticated woven and
knitted fabric at a low cost.
[0018] They have found that the conventional plied yarn is usually
produced by twisting two or three spun yarns and a filament
together in a direction reverse to the twisted direction of the
spun yarns, and the thus produced plied yarn has drawbacks such as
a poor appearance and a stiff touch because the plied yarn is
twisted too much by the twisting of the spun yarns. In view of
this, they have proceeded with a research based on an idea that the
defects of the conventional plied yarn can be overcome by
establishing a technique of entwining a spun yarn with a filament
while suppressing undesired tightening of the twist yarn.
[0019] In the course of the research, they have come up with an
idea that undesired tightening of the spun yarn can be alleviated
by a twisting process in which a single spun yarn and a filament
are entwined and twisted together in a direction reverse to the
twisted direction of the spun yarn, because in such a twisting
process, as the twisting is proceeded, the spun yarn is untwisted,
whereas twisting two or more spun yarns and a filament together
fails to solve the drawback inherent to the conventional plied yarn
because it is a usual practice to set the twisted direction of the
twist yarn reverse to the twisted direction of the spun yarn.
[0020] Twisting a spun yarn and a filament together in a direction
reverse to the twisted direction of the spun yarn, however,
eventually results in untwisting of the spun yarn, and accordingly,
fails to maintain the strength as a composite twist yarn. Namely,
twisting the spun yarn and the filament together in the reverse
direction has a limitation of its own, and a composite twist yarn
having a noticeably superior property to the conventional plied
yarn was unable to obtain according to this method. Particularly,
twisting a spun yarn in the reverse direction to such an extent as
to nullify the twist of the spun yarn, namely, to render the
twisted spun yarn to a substantially untwisted state is not
practically feasible in a twisting process for producing a
composite twist yarn, because the spun yarn brought to such an
untwisted state is returned to a state of raw cotton, and loses its
strength as a yarn.
[0021] In view of the above, the present inventors further
proceeded with a research in an attempt to produce a composite
twist yarn having a superior appearance and touch by securing
entwining of a filament and a spun yarn. As a result of the
research, they have found that making a twisted spun yarn and at
least one filament parallel to each other to a paralleled yarn,
twisting the paralleled yarn in a direction reverse to the twisted
direction of the spun yarn, and continuing the twisting of the
paralleled yarn in the reverse direction over an untwisted point of
the spun yarn is effective in producing a composite twist yarn
having superior properties with respect to all the features of
texture, appearance, and touch, while securing strength as the spun
yarn and entwining of the spun yarn and the filament, and thus,
come up with the present invention.
[0022] As will be clearly described in the following, the composite
twist yarn produced according to the above technique has a unique
twist structure as compared with the conventional and known plied
yarn in that the twisted direction of the composite twist yarn is
substantially identical to the twisted direction of the spun yarn
in the composite twist yarn, and that the number of twists of the
composite twist yarn is larger than that of the spun yarn entwined
in the composite twist yarn.
[0023] In the following, features of a twisting method unique to
the present invention, and a composite twist yarn produced by the
twisting method are described in detail referring to the drawings
illustrating one embodiment of the present invention. It should be
appreciated that various changes and modifications will be apparent
to those skilled in the art. Therefore, unless otherwise such
changes and modifications depart from the scope of the present
invention hereinafter defined, they should be construed as being
included therein.
[0024] According to the embodiment of the present invention, a
single spun yarn B which is twisted in a direction shown in FIG. 1
(Z-direction or Z-twist) and a filament M (monofilament or
multifilament) are rendered parallel to each other to a paralleled
yarn A, and the paralleled yarn A is twisted in a direction reverse
to the Z-direction (namely, S-direction or S-twist), as shown in
FIG. 2. As the paralleled yarn A is twisted in the S-direction, the
spun yarn is gradually untwisted. As the paralleled yarn A is
applied with S-twists by the number corresponding to the number of
untwists of the spun yarn B, the filament M is entwined around the
spun yarn B.
[0025] As the paralleled yarn A is further twisted in the
S-direction to such an extent that the number of S-twists
corresponds to the number of Z-twists which have been applied to
the spun yarn B in its initial state before start of the S-twist,
then, the spun yarn B is completely untwisted and rendered to an
untwisted state. When the spun yarn B is brought to the untwisted
state, the spun yarn B is turned to a raw cotton state, and the
strength as the spun yarn is lost. However, whereas the spun yarn B
is rendered to such an untwisted state, the filament M is entwined
around the spun yarn B by the number of S-twists corresponding to
the number of Z-twists applied to the spun yarn B in the initial
state. Therefore, there is no likelihood that the spun yarn B in
the untwisted state is loosened because the spun yarn B has its
outer portion securely entwined by the filament M.
[0026] In the above, the following should be considered. Since the
strength of the untwisted spun yarn B is substantially zero, the
composite twist yarn relies its strength merely on the strength of
the filament M, and accordingly, a sufficient strength may not be
secured. In view of this, according to the embodiment of the
present invention, the paralleled yarn A is continued to be twisted
in the reverse direction. As the paralleled yarn A is further
twisted in the reverse direction, as shown in FIG. 4, the spun yarn
B is twisted in the direction (S-direction) reverse to the
initially twisted direction (Z-direction). As the number of
S-twists increases, the strength of the spun yarn B itself is
recovered, and the filament M is further entwined around the spun
yarn B, whereby the pitch of the S-twists of the twist yarn
(namely, the composite twist yarn) A increases, and the strength of
the composite twist yarn A increases. Thus, applying the S-twist to
the paralleled yarn A to such an extent as to give a sufficient
strength to the spun yarn B over the untwisted state of the spun
yarn B is effective in providing the composite twist yarn with a
sufficient strength.
[0027] Relations between changes in the twisted directions and the
numbers of twists with respect to the spun yarn B and the
paralleled yarn A are as shown in FIG. 5. Specifically, referring
to FIG. 5, a relation between a change in the twisted direction and
the number of twists of the paralleled yarn A is shown by the solid
line X, and a relation between a change in the twisted direction
and the number of twists of the spun yarn B is shown by the solid
line Y. It should be noted that Z-twist (e.g. 20 times per inch)
has been applied to the spun yarn B in its initial state before
making a paralleled yarn A. As the paralleled yarn A is twisted in
the S-direction reverse to the initially twisted Z-direction of the
spun yarn B, the paralleled yarn A is applied with the S-twist, as
shown by the solid line Y accompanied by untwisting of the spun
yarn B. When the spun yarn B is brought to an untwisted state (see
point Y.sub.1), the paralleled yarn A is applied with S-twists (see
point X.sub.1) by the number substantially equal to the number of
Z-twists which have been applied to the spun yarn B in the initial
state.
[0028] Subsequently, as the S-twist is further applied to the
paralleled yarn A, the spun yarn B is applied with the S-twist,
opposite to the Z-twist which has been initially applied. As the
S-twist is further continued, the number of S-twists to the
paralleled yarn A increases, accompanied by increase of the
S-twists to the spun yarn B. When the spun yarn B reaches the point
Y.sub.2 (e.g. 20 times of S-twists per inch), the paralleled yarn A
reaches the point X.sub.2. At the point X.sub.2, the paralleled
yarn A is applied with the number of twists (namely, 40 times per
inch) which is equal to the sum of the number of twists
corresponding to the Z-twists (20 times per inch) which have been
applied to the spun yarn B in the initial state and the number of
twists (20 times per inch) which is additionally applied to the
spun yarn B from the untwisted state.
[0029] Accordingly, the inventive composite twist yarn which has
reached the point X.sub.2 is applied in its entirety with the
S-twist, in which the twisted direction of the inventive composite
twist yarn is substantially identical to the twisted direction of
the spun yarn B entwined in the composite twist yarn. Thus, the
resultant composite twist yarn has a unique twist structure in
which the twisted direction of the composite twist yarn is
substantially identical to the twisted direction of the spun yarn B
entwined therein, and the number of S-twists of the composite twist
yarn is larger than that of the spun yarn entwined in the composite
twist yarn.
[0030] Although the twisted direction of the composite twist yarn
as a final product differs depending on the twisted direction of
the spun yarn B in the initial state before the twisting process is
initiated, according to the present invention, the twisted
direction of the composite twist yarn as a final product is
substantially identical to the twisted direction of the spun yarn
entwined in the composite spun yarn after the twisting process is
terminated.
[0031] The numbers of twists of the composite twist yarn and the
spun yarn entwined therein can be optionally varied by varying the
number of twists to be applied to the spun yarn B in the initial
state and the number of twists to be applied to the composite twist
yarn over the untwisted state of the spun yarn B. Generally, the
number of twists to be applied to the spun yarn B in the initial
state ranges from about 5 to 45 times per inch depending on the
count of the spun yarn B. A preferred number of times of twists to
be applied to the spun yarn B after the spun yarn B reaches the
untwisted state generally ranges from about 5 to 45 times per inch
in order to secure a strength inherent to the spun yarn B.
Therefore, the total number of twists to be applied to the
composite twist yarn as a final product ranges from about 5 to 90
times per inch, and the number of twists to be applied to the spun
yarn B entwined in the composite twist yarn ranges from about 5 to
45 times per inch, which is about a half of the total number of
twists to be applied to the composite twist yarn.
[0032] More specifically, in case of a spun yarn B of the count No.
20, for example, the number of twists to be applied to the spun
yarn B in the initial state is generally in the range of 15 to 22
times per inch, most typically around 18 times per inch. A
preferred number of twists to be applied to the spun yarn B after
the spun yarn B reaches its untwisted state is generally in the
range of 15 to 22 times per inch (most typically, around 18 times
per inch) to secure a strength inherent to the spun yarn B.
Accordingly, the total number of twists to be applied to the
composite twist yarn as a final product is in the range of 30 to 44
times per inch (most typically, around 36 times per inch), and the
number of twists to be applied to the spun yarn B entwined in the
composite twist yarn is in the range of 15 to 22 times per inch
(most typically, around 18 times per inch), which is about a half
of the total number of twists to be applied to the composite twist
yarn.
[0033] In the embodiment of the present invention, since the
strength of the composite twist yarn is remarkably increased by the
increase of the number of twists of the filament, it may be
possible to lessen the numbers of twists of the composite twist
yarn and the spun yarn B to from about 80 to 90% relative to the
generally used respective numbers of twists thereof to secure a
sufficient strength.
[0034] In the inventive composite twist yarn, there is a case that
the number of twists of the composite twist yarn is remarkably
larger than that of the spun yarn entwined therein. However,
generally, the diameter of the filament to be entwined around the
spun yarn is generally remarkably smaller than that of the spun
yarn. Accordingly, even if a small-diametrical filament is tightly
entwined around a large-diametrical spun yarn, there is no
likelihood that the spun yarn is excessively tightened by the
filament, and the outer portion of the spun yarn in the composite
twist yarn is sufficiently exposed while being entwined by the
filament. With this arrangement, the resultant composite twist yarn
is provided with a texture, appearance, and touch similar to those
of the core yarn, and a strength substantially equal to that of the
plied yarn. Further, according to the embodiment of the present
invention, a single spun yarn is used. Accordingly, a composite
twist yarn of a fine count is easily produced, as compared with the
case of producing a plied yarn with use of two or three spun
yarns.
[0035] As mentioned above, the inventive composite twist yarn has
the unique twist structure obtained by implementing the unique
twisting method. Specifically, the inventive composite twist yarn
has the features "the twisted direction of the composite twist yarn
as a whole is substantially identical to that of the spun yarn
entwined in the composite twist yarn" and "the number of twists of
the composite twist yarn is larger than that of the spun yarn
entwined therein". There is no constraint regarding the material,
size and the like of the spun yarn and the filament. All the kinds
of spun yarns and filaments are usable.
[0036] Specifically, the spun yarn used in the present invention
includes spun yarns such as all the kinds of plant fibers, animal
fibers, regenerated fibers, and synthetic fibers, not to mention
most typical spun yarns derived from cotton, hemp, and wool.
Further, usable is a combined filament yarn, which is a combination
of at least one of the aforementioned spun yarns and filaments.
Generally, a synthetic or semi-synthetic filament such as
polyurethane, polyamide, polyester, acryl, and rayon is used as the
filament in the present invention. Alternatively, a natural
filament such as silk may be used. It is desirable to use an
elastic filament which has an elasticity of its own such as a
filament of a polyurethane resin in order to effectively utilize
the property of the elastic filament in light of the fact that the
core yarn and the plied yarn are frequently used as an elastic
yarn.
[0037] According to the embodiment of the present invention, it is
required to use a single spun yarn in order to effectively utilize
the feature of the abovementioned twisting process. Use of not less
than one spun yarn may not be effective considering the feature of
the present invention that an untwisted state of the spun yarn is
utilized. The size of the spun yarn is not specifically limited.
Any size of the spun yarn is selectable and usable depending on the
use and purpose of use of the resultant composite twist yarn. It is
desirable to select the number of twists of the spun yarn depending
on the count of the spun yarn. The number of filaments is not
specifically limited. One or more than one filament (monofilament
or multifilament) may be paralleled to a spun yarn to make a
paralleled yarn. Generally, one or two filaments is used, and the
size (denier) thereof can be optionally varied depending on the use
and purpose of use of the resultant composite twist yarn.
[0038] As mentioned above, a composite twist yarn of a fine count
can be easily produced by optionally adjusting the number of twists
of the composite twist yarn produced by twisting a single spun yarn
and at least one filament together depending on the requirements on
the resultant composite twist yarn.
[0039] The inventive composite twist yarn can be produced easily
and at a low cost without the necessity of sorting out of raw
cotton, which has been required in the production of the
conventional composite twist yarn, and yet exhibits superior
texture, appearance, and touch similar to those of the expensive
core yarn, and is usable for producing sophisticated woven and
knitted fabrics.
[0040] The inventive composite twist yarn has the aforementioned
features. The features of the inventive composite twist yarn are
effectively exhibited in its use as a raw material yarn for various
woven and knitted fabrics. The weaving pattern and knitting pattern
with use of the inventive composite twist yarn are not specifically
limited. Any weaving pattern such as a plain weaving and a twill
weaving are applicable. In case of producing a woven fabric, the
inventive composite twist yarn may be used as either one of a warp
yarn and a weft yarn, or as both of the warp yarn and the weft
yarn. It is needless to say that a woven fabric can be produced by
using the inventive composite twist yarn as part of a warp yarn
and/or a weft yarn in combination with a conventional core yarn or
the like.
[0041] In the case of a knitted fabric, the entirety of a knitted
fabric can be produced with use of the inventive composite twist
yarn. Alternatively, a knitted fabric may be produced with partial
use of the inventive composite twist yarn in combination with the
other core yarn or the like.
[0042] Specifically, since the inventive composite twist yarn has
substantially equivalent or superior properties to the conventional
core yarn, the features of the composite twist yarn are effectively
exhibited even in a partial use thereof, not to mention its entire
use for producing a woven fabric or a knitted fabric. In view of
this, although the mixing ratio of the inventive composite twist
yarn to the other kind of yarn is not specifically limited, the
mixing ratio of the inventive composite twist yarn to the entirety
of the yarns constituting a woven fabric (knitted fabric) is
preferably 20% or larger, more preferably 30% or larger, and
furthermore preferably 50% or larger in order to effectively
utilize the features of the inventive composite twist yarn.
[0043] Use of the inventive composite twist yarn as, for example, a
yarn for a jeans fabric is preferable because the resultant jeans
fabric exhibits a proper elasticity and flexibility.
[0044] As an example, the present inventors produced the following
composite twist yarn with use of a cotton spun yarn (cotton count
No. 20, 18 times of Z-twists per inch) and an elastic filament
(under the trade-name "espa", product of Toyobo Co., Ltd.: 70
deniers, draft: 3.5 times) at a mixing ratio of the cotton spun
yarn to the elastic filament of 93:7 (unit: %). The composite twist
yarn was produced by making the cotton spun yarn and the elastic
filament parallel to each other to a paralleled yarn, twisting the
paralleled yarn in a direction reversed to the twisted direction of
the cotton spun yarn, and continuing the twisting over the
untwisted point of the cotton spun yarn up to a state where 18
times of S-twists per inch were applied to the cotton spun yarn.
Thus, the composite twist yarn was applied with 36 times of
S-twists per inch, and the cotton spun yarn entwined in the
composite twist yarn was applied with 18 times of S-twists per
inch.
[0045] The resultant composite twist yarn was bulky, exhibited an
elasticity and a proper strength with the cotton spun yarn partly
appearing on the surface of the composite twist yarn and the
elastic filament being securely entwined around the cotton spun
yarn. The composite twist yarn exhibited desirable texture,
appearance, and touch similar to those of a core yarn.
[0046] The present inventors woven a jeans fabric with use of the
thus produced composite twist yarn as a weft yarn and a cotton spun
yarn of the count No. 7 as a warp yarn. The produced jeans fabric
exhibited superior appearance and touch with an elasticity in a
transverse direction thereof being secured.
EXPLOITATION IN INDUSTRY
[0047] The present invention has the aforementioned arrangement,
and is advantageous in easily producing a composite twist yarn
adapted for producing a woven and knitted fabric substantially
equivalent or superior to a conventional core yarn in appearance
and touch. The inventive method is advantageous in producing, with
use of a twisting facility easily and at a low cost, a composite
twist yarn having a substantially equivalent or superior quality to
an expensive core yarn produced by a complex spinning facility. The
present invention does not require sorting out of cotton spun yarn
material (removal of staples), which has been an essential step in
producing a conventional core yarn in combined use of a cotton spun
yarn. With the inventive method, a composite twist yarn of a high
quality can be produced at a low cost. Furthermore, according to
the present invention, since a composite twist yarn of a fine count
can be easily produced, applicability of the inventive composite
twist yarn to a woven and knitted fabric can be broadened.
* * * * *