U.S. patent application number 10/755056 was filed with the patent office on 2004-09-09 for slide fastener tape.
Invention is credited to Horikawa, Mitsuo.
Application Number | 20040173276 10/755056 |
Document ID | / |
Family ID | 32652848 |
Filed Date | 2004-09-09 |
United States Patent
Application |
20040173276 |
Kind Code |
A1 |
Horikawa, Mitsuo |
September 9, 2004 |
Slide fastener tape
Abstract
At least part of constituent yarns extending in the warp
direction outside and adjacent a core thread woven or knitted in an
element attachment edge portion has a higher elongation recovery
ratio R than all the other constituent yarns and the core threads
extending in the warp direction, the elongation recovery ratio R
being expressed by the following equation based on a measurement
according to JIS L1096: R={(L1-L2)/(L1-L0)}.times.100 (1) where L0
is an original length of yarn, L1 is a length of yarn when pulled
under a predetermined tension and L2 is a length of yarn after the
elongation is recovered under no tension. After elements are
mounted, this fastener tape is formed to have a positive pucker
condition in which its element attachment edge portion is dented
and curved while its tape main body is slightly waved.
Consequently, it is possible to construct a woven/knitted fastener
stringer capable of securing linearity after this fastener tape is
sewed to object clothes.
Inventors: |
Horikawa, Mitsuo;
(Toyama-ken, JP) |
Correspondence
Address: |
Michael S. Leonard
Bell, Boyd & Lloyd LLC
P.O. Box 1135
Chicago
IL
60690-1135
US
|
Family ID: |
32652848 |
Appl. No.: |
10/755056 |
Filed: |
January 8, 2004 |
Current U.S.
Class: |
139/384B |
Current CPC
Class: |
A44B 19/346 20130101;
D03D 15/567 20210101; D10B 2501/0631 20130101 |
Class at
Publication: |
139/384.00B |
International
Class: |
D03D 013/00 |
Foreign Application Data
Date |
Code |
Application Number |
Jan 28, 2003 |
JP |
2003-19094 |
Claims
What is claimed is:
1. A slide fastener tape comprising: a tape main body formed by
weaving or knitting; and an element attachment edge portion in
which a core thread is woven or knitted, wherein at least part of
constituent yarns extending in a warp direction outside and
adjacent the core thread in the element attachment edge portion has
a higher elongation recovery ratio R, which is expressed by a
following equation (1) based on a length of yarn measured according
to JIS L1096, than that of all other constituent yarns and the core
threads extending in the warp direction in the tape main body:
R={(L1-L2)/(L1-L0)}.times.100 (1) where L0 is an original length of
yarn, L1 is a length of yarn when pulled under a predetermined
tension and L2 is a length of yarn when no tension is applied.
2. The slide fastener tape according to claim 1, wherein the
elongation recovery ratio R of the yarns having the high elongation
recovery ratio R is 85% or more.
3. The slide fastener tape according to claim 1 or 2, wherein the
elongation recovery ratio R is set to be smaller in an order of the
constituent yarns extending in the warp direction outside and
adjacent the core thread in the element attachment edge portion,
the core threads and all the other constituent yarns extending in
the warp direction.
4. The slide fastener tape according to claim 2 or 3, wherein a
size of the yarns having the high elongation recovery ratio R is
set to be larger than that of a single yarn of the constituent
yarns extending in the warp direction of the tape main body.
5. The slide fastener tape according to claim 1, wherein the yarns
having the high elongation recovery ratio R are composed of
nylon-made multi-filament yarn while all the other constituent
yarns extending in the warp direction are composed of
polyester-made multi-filament yarn.
6. The slide fastener tape according to claim 3, wherein the yarns
having the high elongation recovery ratio R are multi-filament yarn
composed of polycondensate of n-propanediol and terephthalic acid
while all the other constituent yarns extending in the warp
direction are polyester-made multi-filament yarn.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a slide fastener tape
obtained by weaving or knitting and more particularly, to a slide
fastener tape having a so-called positive pucker condition in which
a fastener stringer, on which elements are mounted by strong
stretching and various kinds of heat treatments, is slightly dented
toward the element attachment side, and the slide fastener tape
being integrated with object clothes by sewing such that the entire
surface thereof is uniform and flat without weaving on its tape
main body and its sewed surface by absorbing the aforementioned
slight dent through contraction of the tape main body at the time
of sewing.
[0003] 2. Description of the Related Art
[0004] As for the slide fastener tape (hereinafter referred to as
fastener tape), a plurality of elements, which are formed to mesh
with mating elements, are mounted along a side edge thereof at an
equal pitch and a slider is loaded on the element row. Then, upper
and bottom stopper devices are attached to ends of the element row
so as to produce a slide fastener of a predetermined length. After
that, this slide fastener is sewed to clothes or various kinds of
bags by sewing.
[0005] The fastener tape has a tape main body and an element
attachment edge portion attached to a side edge of the tape main
body. In this element attachment edge portion, a core thread having
a larger diameter than other warp yarns is knitted together along
the longitudinal direction of the tape at the same time when the
tape is knitted or woven in order to not only stabilize the
attachment condition of the respective elements but also increase
their attachment strength.
[0006] Because of a difference in organization and structure
between the tape main body and the element attachment edge portion,
generally, the element attachment edge portion in which the core
thread is disposed has a smaller heat shrinkage than the tape main
body. As a result, the tape main body is contracted largely in the
fastener tape after passing various of heat treatment processes,
thereby likely producing an inverted pucker in which the element
attachment edge portion is warped outwardly.
[0007] On the other hand, when metallic elements or synthetic resin
elements are mounted, a large tension is applied to the fastener
tape, particularly its element attachment edge portion in order to
secure a specific attachment pitch for the elements and the
elements are mounted with its element attachment edge portion and
tape main body in a stretched condition. As a result, even after
the tension is released, the portion having the elements mounted
thereon is not returned to its original length but the side of the
element attachment edge portion of the fastener tape is jumped
outward largely, so that the above-described inverted pucker
condition is more likely to be intensified. This tendency is
remarkable particularly in such a slide fastener demanded to have
plasticity and contraction/expansion property.
[0008] To solve this fault, for example, Japanese Patent
Application Publication No. 59-51807 (patent document 1) has
proposed that a textured yarn is adopted as the constituent yarns
for the tape main body in a fastener tape composed of double-sided
knitting structure, and a core thread covered with a covering yarn
continuous from the tape main body is disposed in the element
attachment edge portion while the boiling water shrinkage ratio of
the core thread is higher than that of the textured yarn.
[0009] Although such a structure puts the element attachment edge
portion into a so-called positive pucker condition in which the
element attachment edge portion is dented inward or curved because
of a difference in thermal shrinkage ratio between the element
attachment edge portion and the tape main body even after heat
treatment. Even if the element attachment edge portion is
contracted, the expansion and contraction property of the tape main
body follows it and consequently, a fastener stringer capable of
holding linearity after elements are mounted is obtained. As a
result, this fastener tape can be sewed to a flexible object
clothes having ample contraction and expansion property in a
condition that it is adapted to the same object clothes.
[0010] On the other hand, when the yarn having contraction and
expansion property used for ordinary fastener tape material is
employed in a fastener tape constructed with ordinary weaving
structure, if the pucker occurs in the fastener tape, the fastener
stringer is incapable of correcting that pucker condition to a
linear condition because the tape main body has no contraction and
expansion property due to the weaving structure. Thus, when this
fastener tape is sewed to clothes or the like, not only the sewing
processing becomes complicated but also the slide fastener mounted
on clothes after sewing is not flattened in the longitudinal
direction, thereby providing waving condition, thus leading to
increase in fault products.
[0011] To solve such a problem, for example, Japanese Patent
Publication No.2002-209613 (patent document 2) has disclosed a
slide fastener tape comprising a tape main body produced by weaving
and an element attachment edge portion in which a core thread is
woven, wherein a foundation warp yarn used for the tape main body
is composed of a textured yarn having a lower thermal shrinkage
ratio than the other warp yarns, and the core thread has a
multi-filament having a high boiling water shrinkage ratio while a
warp yarn inside and adjacent the core thread is composed of a
textured yarn whose boiling water shrinkage ratio is higher than
that of the foundation warp yarn used in the tape main body and
lower than that of the core thread.
[0012] At the time when its weaving is completed, this fastener
tape has an inverted pucker condition in which the element
attachment edge portion is slightly jumped outward and curved
because of a difference in weaving structure between the tape main
body and the element attachment edge portion. If dry thermal
setting is applied to the fastener tape having such a structure for
a short time, the contraction amount of the element attachment edge
portion and the contraction amount of the warp yarn disposed in the
tape main body are hardly different and the contraction amount of
the element attachment edge portion is slightly larger. Thus, the
inverted pucker which is produced when weaving of the fastener tape
is completed is eliminated so that entirely the fastener tape
becomes linear.
[0013] Subsequently, the contraction amount in the fastener tape
due to dying decreases in the order of the core thread, the warp
yarn adjacent the core thread and the tape main body, so that the
fastener tape turns into the positive pucker condition in which the
side of the element attachment edge portion is dented inward like a
bow. At the same time, bias occurs such that the tape main body
turns into a waved condition. When the fastener elements are
mounted under this condition, a large tension is applied to
particularly the element attachment edge portion. Thus, although
the element attachment edge portion is elongated by a tension at
the time when the elements are mounted, that elongation is smaller
than the contraction amount by heating, so that the element
attachment edge portion becomes substantially linear. On the other
hand, because no elongation occurs in the tape main body at the
time when the elements are mounted, that bias condition is
maintained.
[0014] By setting the boiling water shrinkage ratio of the core
thread in the element attachment edge portion of the fastener tape
larger than the boiling water shrinkage ratio of the warp yarn
inside and adjacent the core thread, the difference in thermal
shrinkage between the element attachment edge portion and the tape
main body is changed in steps. Thus, no step-like contraction
behavior is generated between the element attachment edge portion
and the tape main body. Because the element attachment edge portion
in the fastener stringer keeps linear when this slide fastener is
sewed to object clothes, the sewing processing can be executed
accurately, and consequently, a beautiful product can be obtained,
in which no waved state occurs in a longitudinal direction in the
slide fastener after the sewing.
[0015] When a slide fastener chain is sewed to object clothes,
contraction occurs in the fastener tape to be sewed by tension of a
sewing thread. Thus, no pucker occurs in the slide fastener before
sewing as mentioned in the above patent documents 1 and 2. If the
element row and the fastener tape are linear included in the same
plane, the fastener tape is likely to be waved along its sewing
line. Particularly if the object clothes has an ample plasticity
particularly like a thin knit fabric or thin woven fabric, the
product on which each of them is sewed is also waved thereby
leading to drop in product value.
[0016] The present invention has been accomplished to solve such a
problem and a specific object of the present invention is to
provide a woven or knitted slide fastener tape capable of obtaining
a beautiful sewed product regardless of which the sewed product is
hard or soft.
SUMMARY OF THE INVENTION
[0017] The above-described object is achieved by a slide fastener
tape comprising: a tape main body formed by weaving or knitting and
an element attachment edge portion in which a core thread is woven
or knitted, wherein constituent yarns extending in a warp direction
outside and adjacent the core thread in the element attachment edge
portion have an elongation recovery ratio R against a stretching,
which is obtained according to JIS L1096 and is higher than that of
all other constituent yarns and the core threads extending in the
warp direction.
[0018] When weaving or knitting of this fastener tape is completed,
its element attachment edge portion is kept substantially linear
while the tape main body is slightly waved because of a difference
in organization between the tape main body and the element
attachment edge portion, and a difference in elongation recovery
ratio R of constituent yarn between the tape main body and the
element attachment edge portion. If the contraction amount of the
element attachment edge portion and the contraction amount of the
constituent yarns extending in a warp direction in the tape main
body are hardly different from each other even when dry thermal
setting and high-temperature dying are carried out under such a
structure, the configuration produced when weaving or knitting
thereof is completed is not changed largely.
[0019] When the fastener elements are mounted under this condition,
the main body and element attachment edge portion in the fastener
tape are pulled together strongly and particularly, the element
attachment edge portion is pulled relatively strongly. The element
attachment edge portion and the tape main body are elongated
together by a tension at the time when the elements are attached.
The element attachment edge portion approaches to its original
length because the elongation recovery ratio R of the constituent
yarns disposed outside the core thread in the element attachment
edge portion is set larger than the elongation recovery ratio R of
the constituent yarns extending in the warp direction of the tape
main body. However, recovery of its tape main body is small,
thereby providing a positive pucker condition in which the side of
the element attachment edge portion is dented and curved like a bow
while the tape main body is waved.
[0020] If the fastener tape section of the slide fastener having
such a configuration is sewed to object clothes, the tape main body
is flattened due to contraction which occurs at the time of sewing,
so that the fastener tape is sewed in a condition that it is well
adapted to the object clothes. That is, a beautiful product which
does not suffer waving in the longitudinal direction of the slide
fastener after sewing is obtained.
[0021] The elongation recovery ratio R at this time can be obtained
by measuring respective yarn lengths according to JIS L1096 and
using the following equation (1). The elongation recovery ratio R
of the constituent yarns disposed outside the core thread in the
element attachment edge portion of the present invention is
difficult to automatically determine because it is determined
relative to that of the other constituent yarns. However, the
elongation recovery ratio R is preferred to be 85% or higher
because the elongation recovery ratio R of the constituent yarns
disposed outside the core thread in the element attachment edge
section is easier to set to be higher than the other materials. The
elongation recovery ratio R of ordinary multi-filament or
mono-filament is at most 80% even if it reaches its maximum.
R={(L1-L2)/(L1-L0)}.times.100 (1)
[0022] where L0 is an original yarn length, L1 is a yarn length
when pulled under a predetermined tension and L2 is a yarn length
after recovery under no tension.
[0023] For measurement of the yarn length based on JIS L1096, a
tension test machine or an apparatus having similar performance is
used. With an end of a test piece fixed with a clamp, an initial
load is applied to the other end and marks are made at a position
20 cmk from a bottom end of the clamp in the test piece. Next, a
load of 14.7 N (1.5 kgf) is applied gently and after leaving for
one hour, the interval between the marks is measured. Next, the
load is removed and the initial load is applied 30 seconds after
and one hour after and then the interval between the marks is
measured. The elongation recovery ratio R is obtained according to
the above-described equation (1) and three average values are
calculated about 30 seconds after and one hour after.
[0024] The elongation recovery ratio R is preferred to be set
smaller in the order of the constituent yarns in the element
attachment edge portion extending in the warp direction outside and
adjacent the core thread, the core thread and all the other
constituent yarns extending in the warp direction in the tape main
body. If the fastener tape is left under no load after it is
stretched equally with such a structure, the constituent yarns in
the element attachment edge portion extending in the warp direction
outside and adjacent the core thread, the core thread and the tape
main body try to return to their original lengths in this order. As
a result, their elongation recovery behaviors are obtained without
any difference in step among these yarns, thereby providing a
positive pucker condition in which the element attachment edge
portion is dented and curved like a bow. When the slide fastener is
sewed to object cloth, contraction at the time of sewing is
absorbed by the waving state of the tape main body, so that the
sewing work can be carried out easily and accurately and a
beautiful product can be obtained after the sewing.
[0025] According to the present invention, preferably, the size of
a single yarn having a high elongation recovery ratio R is set
larger than the size of the single yarn in all the constituent
yarns extending in the warp direction. If the size of the single
yarn having the high elongation recovery ratio R is larger than the
size of the single yarn in all the other constituent yarns
extending in the warp direction, the recovery ratio after the
elongation is increased. Even if the inverted pucker condition is
conceivable until elements are mounted, it can be changed to a
slight positive pucker condition securely after the elements are
mounted.
[0026] Examples of a typical material for a yarn having a high
elongation recovery ratio R include nylon and polycondensate of
n-propanediol and terephthalic acid. If multi-filament yarn of
polyester is employed for all the other constituent yarns extending
in the warp direction in the tape main body except these yarns, it
is preferable because a conceivable different can be provided to
the elongation recovery ratio R between them. In the case of a
fastener tape obtained by weaving, employing the textured yarn for
all warps yarns used in the element attachment edge portion and
tape main body is preferable because it prevents deviation in
stitch. However, the knit fastener tape does not always need to be
of a textured yarn because there is no fear that their stitches may
be deviated.
BRIEF DESCRIPTION OF THE DRAWINGS
[0027] FIG. 1 is an enlarged partial perspective view schematically
showing a typical embodiment of a weaving structure of a fastener
tape according to the present invention;
[0028] FIG. 2 is a sectional view taken along the line II-II of
FIG. 1;
[0029] FIG. 3 is an explanatory diagram schematically showing
changes in style in each processing step for the fastener tape;
[0030] FIG. 4 is a sectional view corresponding to FIG. 2 and
showing a modification of the embodiment;
[0031] FIG. 5 is a sectional view corresponding to FIG. 2 and
showing another modification of the embodiment;
[0032] FIG. 6 is a partial plan view schematically showing a
typical embodiment of a knitting structure of the fastener tape
according to the present invention; and
[0033] FIG. 7 is a partial plan view showing a modification of the
embodiment.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0034] Hereinafter, preferred embodiments of the present invention
will be described in detail with reference to the accompanying
drawings.
[0035] FIG. 1 shows an example of a woven fabric of a fastener tape
according to a typical embodiment of the present invention.
Although the weaving structure shown in this figure is expressed
roughly for graphic representation, actually, this is composed of a
tight structure.
[0036] The fastener tape 1 having this weaving structure is woven
by means of a small-width weaving machine usually called needle
weaving machine. As shown in FIG. 1, a yarn is reciprocated through
an opening produced by the warp yarns, so that two yarns act as a
pair of weft yarns 2 in a condition that they are doubled. Although
in this figure, the pair of weft yarns 2 inserted laterally are
expressed as a condition that yarns 2a, 2b doubled are set apart
from each other in a vertical direction, actually, the yarns 2a, 2b
keep in contact with each other. A loop end formed at a return end
of the weft yarn 2 entangles with a loop end of a weft yarn (not
shown) which is to be formed next time with a latch needle (not
shown), so as to form an ear section at a side edge of the fastener
tape 1. On an edge opposite to the ear section formed by
entanglement of the weft yarns 2, fastener elements 3 are attached
as indicated with a phantom line in FIG. 2.
[0037] That is, the fastener tape 1 is comprised of an element
attachment edge portion 4 on which fastener elements 3 are to be
attached and which is located on an edge portion opposite to the
ear section (not shown) formed by entanglement of the loop ends of
the weft yarns 2, and a tape main body 5 which is stretched from
the element attachment edge portion 4 to the ear section (not
shown) on the opposite side. As the yarns 2a, 2b which compose the
weft yarns 2 of this embodiment, a fine textured yarn constituted
of 330 dTex polyester is employed.
[0038] As two warp yarns 6a, 6b to be disposed adjacent and outside
the element attachment edge portion 4 in the indicated example,
nylon multi-filaments thicker than the other warp yarns 6c, 6d, 6e,
. . . 6m, 6n are disposed and two core threads 7a, 7b are disposed
inside and adjacent the two warp yarns 6a, 6b. Further, the
polyester textured yarns composing two pairs of warp yarns 6c to
6f, each composed of two yarns, are disposed inside and adjacent
the core threads, thereby constructing the element attachment edge
portion 4.
[0039] Further, the multiple foundation warp yarns 6g, 6h, . . .
6m, 6n are disposed in the tape main body 5 from its inside up to
the ear section. These foundation warp yarns 6g, 6h, . . . 6m, 6n
are woven successively while each is composed of two yarns as a
pair. Two narrow warp yarns 6o-1, 6o-2 disposed outside the two
warp yarns 6a, 6b, disposed outside and adjacent the aforementioned
element attachment edge portion 4, have a function of holding the
configuration of the edge of the element attachment edge portion 4.
According to this embodiment, the entire organization except the
core threads 7a, 7b is a plain weaving organization in which the
warp and weft yarns are woven with two yarns of each as a pair.
[0040] The two warp yarns 6a, 6b having a high elongation recovery
ratio R disposed in the element attachment edge portion 4 of the
fastener tape 1 and outside of the attachment edge portion are
composed of nylon multi-filament having a boldness of 470 Tex. The
two core threads 7a, 7b are composed of polyester made
multi-filament of 560 dTex of gray yarn as a core thread and knit
yarns of 267 dTex covering the circumference of the former. The
respective warp yarns 6c, 6d, . . . 6m, 6n on the side of the tape
main body of the element attachment edge portion 4 are composed of
polyester textured yarns of 330 dtex. Further, the two warp yarns
6o-1, 6o-2 disposed most outside in the element attachment edge
portion 4 are composed of polyester textured yarns of 235 dTex.
[0041] To prevent the inverted pucker from being generated at the
time of producing the fastener stringer keeping the positive pucker
condition in which the element attachment edge portion 4 is
slightly dented so that the configuration is curved under the
present invention, it is important that the warp yarns 6a, 6b
disposed outside and adjacent the core threads 7a, 7b are not
elongated by liquid pressure at the time of injection of the
fastener element and in coloring process. The elongation recovery
ratio R of the two warp yarns 6a, 6b having a high elongation
recovery ratio R is 94.3%, the elongation recovery ratio R of the
warp yarns 6c, 6d, . . . 6m, 6n disposed in the tape main body is
67.0% and the elongation recovery ratio R of the core threads 7a,
7b is 73.1%. That is, the elongation recovery ratio R decreases
gradually in the order of the two warp yarns 6a, 6b disposed
outside and adjacent in the element attachment edge portion, the
core threads 7a, 7b and the warp yarns 6c, 6d, . . . 6m, 6n
disposed in the tape main body.
[0042] Further, the above-mentioned core threads 7a, 7b have a
boiling water shrinkage ratio of 15%, which is extremely larger
than the other yarns, so that the thermal setting contraction is
increased from conventional 5% to 7%. Meanwhile the elongation
recovery ratio R of the two warp yarns 6o-1, 6o-2 disposed most
outside in the element attachment edge portion 4 is equal to the
elongation recovery ratio R of the warp yarns 6c, 6d, . . . 6m, 6n
disposed in the tape main body.
[0043] To block generation of the inverted pucker at the time of
manufacturing the fastener stringer according to the present
invention, it is important also to secure a high contraction in the
core threads 7a, 7b and suppress the elongation of a tape on the
side of the element attachment edge portion 4 to a small level
after the fastener tape 1 passes coloring step in order to block
the core thread from being elongated at the time of fastener
element injection (not shown). For the reason, as for the structure
of the core threads 7a, 7b, the core threads are covered so as to
surround a core material with a knit tube obtained by intersecting
sinker loops each composed of multiple knitting yarns with each
other like the core thread structure disclosed by, for example,
Japanese Utility Model Application Publication No. 55-21605.
According to this embodiment, gray yarn multi-filaments of
polyester of 330 dTex.times.2 are employed as the core thread and
its boiling water shrinkage is set to as high as 15%.
[0044] By adopting the above-described weaving structure and
different kinds of the warp yarns of this embodiment, the
configuration of the fastener tape 1 changes as indicated in FIGS.
3A to 3E each time when it passes a predetermined heat treatment
process. Consequently, when elements are attached by injection
under a high temperature, a fastener stringer 8 is configured into
a positive pucker in which the side of the element attachment edge
portion 4 is slightly dented to produce a curved shape. Its slight
waving condition is eliminated by contraction in the fastener tape
generated when it is sewed to mating clothes so that a beautiful
sewing configuration can be obtained easily.
[0045] This will be explained with reference to FIG. 3. First, it
is assumed that the fastener tape is woven with all the warp yarns
6o-1, 6o-2, 6a, 6b, . . . 6m, 6n and core threads 7a, 7b under the
same tension. In this case, although the warp yarns 6a, 6b having a
high elongation recovery ratio R are substantially returned to
their original length, the other warp yarns 6o-1, 6o-2, . . . 6m,
6n and core threads 7a, 7b cannot return to their original length
completely. Therefore, as shown in FIG. 3A, a positive pucker
condition in which the side of the element attachment edge portion
4 is slightly dented is formed. However, on a stage when the
weaving is completed, the element attachment edge portion 4 is
substantially linear while only minute wave-like bias is generated
in the tape main body 5.
[0046] Then, the fastener tape 1 obtained in this way is dyed. As
for this dying, usually, the fastener tape 1 is wound around a
dying beam (not shown) and that beam is dipped into dying solution
circulated in a dying machine and then, the fastener tape 1 is dyed
under high temperatures. Therefore, unless the fastener tape is
wound around the beam uniformly, no uniform dying can be obtained.
For the reason, the fastener tape 1 having the pucker condition
just after weaving is completed is subjected to the thermal setting
under a dry hot condition temporarily. At this time, a uniform
tension is applied to the fastener tape 1 to execute linear thermal
setting so that uniform winding around the beam is secured.
[0047] When this just woven tape is subjected to thermal setting
under a dry hot condition of, for example, 180.degree. C. for a
minute, as shown in FIG. 3B, although the core threads 7a, 7b are
contracted, they are not contracted completely because the thermal
setting processing time is short. Further, a difference in
contraction between the element attachment edge portion 4 and the
tape main body 5 at the time of thermal setting is quite small and
bias in the element main body hardly exists visibly.
[0048] Next, the fastener tape 1 is dipped into a high-pressure
dying solution at 130.degree. C. and dyed for 40 minutes.
Consequently, the element attachment edge portion 4 is contracted
most and then, the core threads 7a, 7b are contracted next, so that
a, difference in contraction occurs between the element attachment
edge portion 4 and the tape main body 5. As a result, as shown in
FIG. 3C, a positive pucker condition becomes evident so that it is
visually found that wave-like bias is generated in the tape main
body 5 at the same time.
[0049] Fastener elements 3 are injection-molded under high
temperatures subsequent to dying and then, are integrated with the
element attachment edge portion 4 of the fastener tape 1. At this
injection-molding time, the largest tension is applied to the
element attachment edge portion 4 so that it is elongated. Although
if the tension is released after the molding, the elongation in the
element attachment section of the element attachment edge portion 4
is not recovered but that in the tape section between the elements
is largely elongated or recovered. At this time, the recovery from
the elongation in the core threads 7a, 7b and tape main body 5 is
small and because of the difference in elongation recovery ratio R,
the warp yarns 6a, 6b disposed outside and adjacent the core
threads 7a, 7b, the core threads 7a, 7b, and the warp yarns 6c, 6d,
. . . 6m, 6n disposed in the tape main body try to return to their
original lengths. Thus, the warp yarns 6a, 6b disposed outside and
adjacent the core threads 7a, 7b are recovered to their original
length most while the amount of the recovery in the warp yarns 6c,
6d, . . . 6m, 6n in the tape main body is the smallest. As a
result, after the manufacturing, the element attachment edge
portion 4 in a fastener chain 9 becomes linear as shown in FIG. 3D
so that the waving in the tape main body 5 is evident.
[0050] After the manufacturing, a slider is loaded on the fastener
stringer 8 and upper and bottom stopper devices are mounted. When
this slide fastener is sewed to object clothes, although usually
its sewing section is waved due to contraction by sewing, the slide
fastener of this embodiment fits to the object clothes regardless
of which it is hard or soft at the time of sewing because the tape
main body 5 is in the waving condition. Consequently, not only the
slide fastener can be sewed easily but also as shown in FIG. 3E, a
product after sewing 10 can be completed beautifully. Particularly,
this slide fastener is preferable for a soft object clothes.
[0051] FIG. 4 shows a modification of the fastener tape 1 obtained
by weaving in the same way as the above-described embodiment. This
modification is achieved by modified hollow-weaving and although
the organization of the core threads 7a, 7b to be woven into the
element attachment edge portion 4 is the same as the
above-described embodiment, the two warp yarns 6a, 6b having a high
elongation recovery ratio R disposed outside and adjacent the same
core threads 7a, 7b are arranged in parallel in the direction of
the front and rear sides of a tape surfaces and the two warp yarns
6o-1, 6o-2 having a small diameter disposed most outside in the
element attachment edge portion 4 are excluded from this
embodiment.
[0052] According to this modification, a textured yarn composed of
polycondensate constituted of n-propanediol having a high
elongation recovery ratio R and terephthalic acid is employed for
the warp yarns 6a, 6b having a high elongation recovery ratio R in
the element attachment edge portion 4 like the above embodiment. A
textured yarn of polyester having a smaller elongation recovery
ratio R than the warp yarns 6a, 6b is employed for the warp yarns
6c, 6d, . . . 6m, 6n in the tape main body 5 like the above
embodiment. The elongation recovery ratio R of yarn (made by Asahi
Chemical Industry Co., Ltd.) composed of polycondensate constituted
of the aforementioned n-propanediol and terephthalic acid is 88%
and the elongation degree is 36 to 37%, which are extremely larger
than polyester and nylon 66.
[0053] FIG. 5 shows another modification of the above-described
embodiment. According to this modification, the element attachment
edge portion 4 is formed as hollow-woven section and a large core
thread 7 is inserted in this hollow-woven section. Three warp yarns
6o, 6a, 6b composed of large nylon multi-filament having a higher
elongation recovery ratio R than the other warp yarns 6c, 6d, . . .
6m, 6n are disposed as yarns arranged most outside in the
hollow-woven section. Polyester is used as material of the other
warp yarns 6c, 6d, . . . 6m, 6n like the above embodiments.
[0054] According to this modification also, the fastener stringer 8
after the elements 3 are mounted is formed to have a positive
pucker condition in which the element attachment edge portion 4 is
slightly dented, so that a product after the fastener stringer is
sewed thereto can be finished beautifully. Further, two or three
warp yarns 6a, 6b (6o) having a higher elongation recovery ration R
than the other warp yarns 6c, 6d, 6m, 6n are disposed most outside
in the element attachment edge portion 4. Therefore, the behavior
of the fastener stringer which tries to return to its original
configuration is unlikely to be affected by its peripheral
organization so that its predetermined recovery amount becomes easy
to obtain and thus, the positive pucker condition can be obtained
securely.
[0055] FIG. 6 shows a second embodiment of the present invention. A
fastener tape 11 of this embodiment is a warp knit tape. Although
this figure expresses the arrangement of the constituent yarns
roughly, actually, they are knitted more tightly. Like the first
embodiment described above, this fastener tape 11 is comprised of
an element attachment edge portion 14 on which multiple elements 3
are to be attached at an equal pitch and a tape main body 15 to be
sewed to object clothes (not shown). According to this embodiment,
chain knitting yarns 16a, 16b, . . . 16m, 16n are disposed on all
wales and a 0-0/3-3 weft yarn 12a is inserted into a needle loop of
each of the chain knitting yarns 16a, 16b, . . . 16m, 16n
successively. One core thread 17 is disposed between the chain
knitting yarns 16a and 16b in the element attachment edge portion
14 and the core thread 17 is knitted into and fixed in the element
attachment edge portion 14 by intersecting this weft yarn 12a with
the 3-3/0-0 weft yarn 12b on the front and rear surfaces.
[0056] A nylon-made multi-filament yarn 16p having a higher
elongation recovery ratio R than the other composition knitting
yarns 16a, 16b, . . . 16m, 16n, which is a feature section of the
present invention, is inserted longitudinally between the front and
rear weft yarns 12a and 12b and at the same time, between the chain
knitting yarn 16a and the core thread 17, the chain knitting yarn
16a being disposed outside the core thread 17 of the two chain
knitting yarns 16a, 16b disposed in the element attachment edge
portion 14. The total size of the nylon-made multi-filament yarn
16p used in the present invention is 470 dTex and its elongation
recovery ratio R is 94%.
[0057] On the other hand, the core thread 17 is produced by
covering a core material 17a of polyester-made multi-filament yarn
of three gray yarns of 560 dTex with a covering section 17 which is
hollow-woven with a single polyester-made multi-filament yarn of
267 dTex and its elongation recovery ratio R is 78.8%. A textured
yarn composed of 330-dTex polyester-made multi-filament is employed
for the chain knitting yarns 16a, 16b, . . . 16m, 16n and the weft
yarns 12a, 12b and its elongation recovery ratio R is 75.6%.
[0058] The chain knitting yarns 16a, 16b, . . . 16m, 16n and the
weft yarns 12a, 12b of this embodiment utilize a small size yarn
and organized in a knitting structure. Accordingly, the fastener
tape 11 after knitting has an extremely excellent plasticity and
adapts itself to a knit fabric or thin woven cloth easily. Further,
because the above-described structure is adopted, a fastener
stringer (not shown) after the elements 3 are attached has a
positive pucker condition in which the element attachment edge
portion 14 is slightly dented like the first embodiment, so that it
adapts itself to an object clothes well. At the same time, it can
absorb a contraction generated at the time of sewing sufficiently
and consequently, a beautiful sewing product is produced.
[0059] FIG. 7 shows a modification of the second embodiment.
According to this modification, the nylon-made multi-filament yarn
16p of the second embodiment is excluded and a nylon-made
multi-filament yarn having a high elongation recovery ratio is
employed for the chain knitting yarn 16a disposed outside the core
thread 17 of the two chain knitting yarns 16a, 16b disposed in the
element attachment edge portion 14. The physical property at this
time is substantially the same as the second embodiment. According
to this modification, the chain knitting yarn 16a disposed most
outside in the element attachment edge portion 14 is more than
twice longer than the second embodiment. Thus, the amount of
returning to its original length after the chain knitting yarn 16a
is stretched strongly when the elements are mounted is relatively
larger than the other chain knitting yarns 16b, . . . 16m, 16n, so
that the positive pucker condition in which the element attachment
edge portion 14 is dented and curved becomes evident.
[0060] As evident from the above description, the elongation
recovery ratio R of the core thread composing the element
attachment edge portion and the constituent yarns adjacent the
inside of the same core thread and that of the constituent yarns
and core thread extended in the other warp direction, material of
those constituent yarns and core thread and their knitting/weaving
structure are not restricted to the above-described configuration
and as well understood, may be modified in various ways within a
technical scope mentioned by the present invention.
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