U.S. patent application number 09/856315 was filed with the patent office on 2002-10-31 for warp knit having an excellent touch, and a process of preparing the same.
Invention is credited to Cho, Dae Hyun, Choi, Yoeng Beek, Yoon, Joon Young.
Application Number | 20020160679 09/856315 |
Document ID | / |
Family ID | 27350112 |
Filed Date | 2002-10-31 |
United States Patent
Application |
20020160679 |
Kind Code |
A1 |
Yoon, Joon Young ; et
al. |
October 31, 2002 |
Warp knit having an excellent touch, and a process of preparing the
same
Abstract
The present invention relates to a warp knit having excellent
touch and a process of preparing such a warp knit. The present
invention provides a warp knit consist of a front surface layer and
a rear surface layer, the front surface layer consisting of ultra
fine yarn with mono-filament denier of 0.01.about.0.9 denier, the
rear surface layer consisting of synthetic yarn or high shrinkage
yarn with mono-filament denier of 1.about.5 denier, wherein the
recovery rate of elongation in the directions of wale and course is
8.about.30%. The warp knit according to the present invention is
used to manufacture artificial leathers or ladies' clothes.
Inventors: |
Yoon, Joon Young;
(Busan-city, KR) ; Choi, Yoeng Beek; (Daegu-city,
KR) ; Cho, Dae Hyun; (Daegu-city, KR) |
Correspondence
Address: |
TransPotomac Plaza
1033 North Fairfax Street Suite 306
Alexandria
VA
22314
US
|
Family ID: |
27350112 |
Appl. No.: |
09/856315 |
Filed: |
May 21, 2001 |
PCT Filed: |
November 30, 2000 |
PCT NO: |
PCT/KR00/01202 |
Current U.S.
Class: |
442/312 |
Current CPC
Class: |
D10B 2401/18 20130101;
Y10T 442/413 20150401; Y10T 442/438 20150401; D04B 21/16 20130101;
D04B 21/00 20130101; Y10T 428/2915 20150115; Y10T 442/456 20150401;
Y10T 442/45 20150401; D04B 21/18 20130101 |
Class at
Publication: |
442/312 |
International
Class: |
D04B 001/00; D04B
007/00; D04B 009/00; D04B 011/00; D04B 021/00; D04B 001/22; D04B
007/24; D04B 009/24; D04B 021/20 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 16, 1999 |
KR |
1999/58119 |
Sep 19, 2000 |
KR |
2000/54839 |
Sep 19, 2000 |
KR |
2000/54840 |
Claims
What is claimed is:
1. A warp knit having excellent touch, characterized in that;
consist of a front surface layer and a rear surface layer, the
front surface layer consisting of ultra fine yarn with
mono-filament denier of 0.01.about.0.9 denier, the rear surface
layer consisting of synthetic yarn or high shrinkage yarn with
mono-filament denier of 1.about.5 denier, wherein the recovery rate
of elongation in the directions of wale and course is
8.about.30%.
2. The warp knit having excellent touch as claimed in claim 1,
wherein the ultra fine yarn is polyester or polyamide.
3. The warp knit having excellent touch as claimed in claim 1,
wherein content of the ultra fine yarn constituting the front
surface layer is 40.about.85% in weight of the total weight of the
processed warp knit.
4. The warp knit having excellent touch as claimed in claim 1,
wherein content of the high shrinkage yarn constituting the rear
surface layer is 15.about.60% in weight of the total weight of the
processed warp knit.
5. The warp knit having excellent touch as claimed in claim 1,
wherein the high shrinkage yarn is co-polyester yarn with
15.about.50% of shrinkage rate in boiling water.
6. The warp knit having excellent touch as claimed in claim 1,
wherein the synthetic yarn is polyester or polyamide.
7. A process of preparing a warp knit having excellent touch,
characterized in that firstly, knitting a warp knit by using a
composite fiber consisting of a fiber formation component of
0.01.about.0.9 denier and a extraction component as a yarn of a
front surface layer, and a synthetic yarn or high shrinkage yarn
with mono-filament of 1.about.5 denier as a yarn of a rear surface
layer, and then raising the warp knit until the shrinkage rate of
the warp knit is reached 40% or more, and then preliminarily
heating, extracting the extraction component from the composite
fiber, dyeing, buffing, and finally heating the warp knit
continuously.
8. The process of preparing a warp knit having excellent touch as
claimed in claim 7, wherein ratio in weight of the yarn of the
front surface layer: the yarn of the rear surface layer is
40.about.85% in weight: 15.about.60% in weight.
Description
TECHNICAL FIELD
[0001] The present invention relates to a warp knit having
excellent touch and a process of preparing such a warp knit.
[0002] More particularly, the present invention relates to a warp
knit with softness and draping property due to its very fine
structure and thus useful for materials of artificial leathers or
ladies' clothes, and a process of preparing such a warp knit.
BACKGROUND ART
[0003] If a fiber becomes fined, its bending strength becomes
weakened. Accordingly, since fabrics produced with ultra fine fiber
have very soft touch, researches in connection with producing such
ultra fine fiber on a commercial scale are developing very
actively. Also, development of the technology which is capable of
producing synthetic yarn extremely finely leads to great
improvement of the value of the goods of sensitive materials for
clothes.
[0004] Generally, a process of preparing ultra fine fiber is
divided into three processes: a direct spinning process; a two
components division type spinning process; and a two components
extraction type spinning process. In the direct spinning process,
it is possible to prepare ultra fine fiber of 0.3.about.0.5 denier.
In the two components division type spinning process, it is
possible to prepare ultra fine fiber of 0.2 denier. In the two
components extraction type spinning process, it is possible to
prepare ultra fine fiber of 0.01 denier or below.
[0005] In case that the ultra fine fiber prepared by means of the
direct spinning process is applied to a warp knit, warping property
and appearance of the warp knit is very poor since numerous
filaments are scattered. Furthermore, the warp knit thus prepared
is very inferior in touch and writing effect.
[0006] In case that the ultra fine fiber prepared by means of the
two components division type composite spinning process consisting
of nylon/polyester is applied to a warp knit, warping property and
knitting property of the warp knit is very poor since the nylon is
isolated from the polyester by means of the tension and friction in
warping and knitting. Furthermore, appearance of the prepared
product is very poor due to limit of the denier of the ultra fine
fiber.
[0007] In case that the composite fiber of 0.05 denier or below
prepared by means of the two components extraction type spinning
process is applied to a warp knit, warping property, knitting
property and touch of the warp knit are good; however, density in
the structure of the warp knit is loosened and thus appearance of
the warp knit is poor since the extraction component is extracted
at the following processing step for producing in ultra fine
fiber.
[0008] Producing goods with ultra fine fiber are developing in
variety in connection with textile applications. However, producing
goods with ultra fine fiber are not developing connection with
knitting applications since the poor warping property and the
several drawbacks generated at the following processing step as
mentioned above.
[0009] Accordingly, it is an object of the present invention to
prepare a warp knit, which has excellent touch, shape stability,
and appearance, and thus is suitable for materials of ladies'
clothes, with good warping property and knitting property.
DISCLOSURE OF THE INVENTION
[0010] The present invention provides a warp knit which has
excellent touch, shape stability, flexibility, and appearance, and
thus is suitable for materials of ladies' clothes. The present
invention also provides a process of preparing such a warp knit
with good warping property and knitting property.
[0011] More particularly, the present invention relates to a warp
knit having excellent touch, consist of a front surface layer and a
rear surface layer, the front surface layer consisting of ultra
fine yarn with mono-filament denier of 0.01.about.0.9 denier, the
rear surface layer consisting of synthetic yarn or high shrinkage
yarn with mono-filament denier of 1.about.5 denier, wherein the
recovery rate of elongation in the directions of wale and course is
8.about.30%.
[0012] The present invention also relates to a process of preparing
a warp knit having excellent touch, characterized in that knitting
a warp knit by using a composite fiber consisting of a fiber
formation component of 0.01.about.0.9 denier and a extraction
component as a yarn of a front surface layer, and a synthetic yarn
or high shrinkage yarn with mono-filament of 1.about.5 denier as a
yarn of a rear surface layer, and then raising the warp knit until
the shrinkage rate of the warp knit is reached 40% or more, and
then preliminarily heating, extracting the extraction component
from the composite fiber, dyeing, buffing, and finally heating the
warp knit continuously.
[0013] The present invention will now be described in more
detail.
[0014] The inventor of the present application accomplished the
present invention, taking notice of the fact that the selection and
the combination of the materials in designing structure is very
important in order to prepare polyester warp knit which is as soft
as natural suede and which has excellent appearance as well as
excellent warping property and knitting property.
[0015] Fist of all, the present invention uses a composite fiber
consisting of fiber formation components of 0.01.about.0.9 denier
and extraction component as a yarn of the front surface layer. If
the extraction component is removed from the composite fiber, the
fiber formation component with mono-filament denier of
0.01.about.0.9 denier is only remained. If the mono-filament denier
of the yarn at the front surface layer is more than 0.9 denier, its
soft touch is poor and the writing effect is not revealed. If the
mono-filament denier of the yarn at the front surface layer is less
than 0.01 denier, its soft touch is maintained, but its appearance
is poor since the raised fiber are omitted or entangled due to
friction.
[0016] It is preferable that the density of the yarn at the front
surface layer is increased in order to improve the touch of the
warp knit. It is possible for increasing the density of the yarn at
the front surface layer to reduce the content of extraction
component in the composite fiber during the manufacturing stage;
however, it is curbed technically in spinning process, and there
are limitations in increasing the density thereof even if the
content of the extraction component in the composite fiber is
reduced.
[0017] The content of the extraction component in the composite
fiber is generally 20.about.40% in weight.
[0018] Accordingly, it is more preferable for increasing the
density of fiber at the front surface layer to use high shrinkage
yarn as a yarn of the rear surface layer.
[0019] It is preferable that polyester is used as the fiber
formation component and copolyester with excellent alkali
hydrolysis property is used as the extraction component of the
composite fiber used as yarn of the front surface layer.
[0020] Next, synthetic yarn or high shrinkage yarn with
mono-filament denier of 1.about.5 denier are used as the yarn of
the rear surface layer. If the mono-filament denier of the yarn at
the rear surface layer is less than 1 denier, draping property of
the warp knit is decreased. If the mono-filament denier of the yarn
at the rear surface layer is more than 5 denier, warping property
and knitting property of the warp knit are deteriorated.
[0021] The high shrinkage yarn, which are used as the yarn of the
rear surface layer, preferably have the shrinkage rate of boiling
water of 15.about.50% and the stress of the heat shrinkage of 0.2
g/d or more. If the shrinkage rate of boiling water is less than
15%, it is not possible to increase the density of ultra fine yarn,
which are the yarn of the front surface layer, and thus the touch
is poor since the shrinkage is extremely low. If the shrinkage rate
of boiling water is more than 50%, it is possible to increase the
density of ultra fine yarn, which are the yarn of the front surface
layer; however, it is hard to control the process width of the
finished warp knit since the shrinkage is extremely high.
Furthermore, if the stress of the heat shrinkage is less than 0.2
g/d, the stress between the structural points is not overcome even
if the shrinkage rate of boiling water is high, and therefore
sufficient shrinkage is not provided.
[0022] Copolyester is preferably used as the high shrinkage yarn as
mentioned above. Co-polymer components include bisphenol-A,
polyethyleneglycol, isophthalic acid or the like. However, the
present invention is not limited to the co-polymer components as
described above.
[0023] Also, the present invention use a synthetic yarn with
mono-filament denier of 1.about.5 denier as a yarn of the rear
surface layer. The synthetic yarn is polyester filament or
polyamide filament, more preferable polyester filament. If the
mono-filament denier of the yarn at the rear surface layer is less
than 1 denier, it is impossible to add proper repulsion to warp
knit. If the mono-filament denier of the yarn at the rear surface
layer is more than 5 denier, the process of warping and knitting
are difficult, and touch of warp knit are deteriorated because
repulsion of warp knit is increased too much.
[0024] The content of yarn of the rear surface layer when it is
knitted is preferably 15.about.60% in weight of the total weight of
the processed warp knit. If the content of the yarn at the rear
surface layer is less than 15% in weight, draping property is
deteriorated. If the content of the yarn at the rear surface layer
more than 60% in weight, the touch is deteriorated.
[0025] The content of the yarn of the front surface layer when it
is knitted is preferably 40.about.85% in weight of the total weight
of the processed warp knit. If the content of the yarn of the front
surface layer is less than 40% in weight, the touch of the warp
knit is poor. If the content of the yarn of the front surface layer
is more than 85% in weight, the draping property and the mechanical
property of the warp knit is deteriorated.
[0026] The present invention is characterized in that such a raw
warp knit as mentioned above is raised so that the shrinkage rate
of the raw warp knit is 40% or more before preliminary heat
treatment of the raw warp knit. After the raw warp knit is raised
according to the present invention, it is preliminarily
heat-treated as usual, and it is treated in alkali solution,
thereby the extraction component is removed from the composite
fiber. After that, the warp knit is dyed, buffered and finally
heat-treated.
[0027] As the present invention use the extraction typed composit
fiber as the yarn of the front surface layer, the warping and
knitting property is excellent. And as the extraction component of
composit fiber is extracted in after-process, the yarn of the front
surface layer is fined. As result, the warp knit of the present
invention has excellent touch and writing effect.
[0028] Meanwhile the warp knit of the present invention is composed
densely out of ultra fine yarn with mono-filament denier of
0.01.about.0.9 denier, whereby its touch and appearance are very
excellent. Especially, as the warp knit of the present invention
includes the rear surface layer consisting of high shrinkage yarn
with 15.about.50% of shrinkage rate of boiling water, the density
of the ultra fine yarn at the front surface layer is higher, and
recovery rate of elongation of a warp knit in the directions of the
wale and the course is 8.about.30%, which represents excellence.
Also, as the warp knit of the present invention includes
15.about.60% in weight of the rear surface layer consisting of the
high shrinkage yarn, the touch and the draping property of the warp
knit are excellent.
[0029] Also, the warp knit of the present invention, used the
synthetic yarn with proper denier as the yarn of the rear surface
layer, can solve the problem that the touch of warp knit prepared
by two component extraction fiber is soft too much. And the above
mentioned warp knit has excellent draping property and raising
property.
[0030] As described in detail above, the warp knit of the present
invention has excellent touch, appearance, and draping property,
and thus it is suitable for materials of ladies' clothes or
materials of artificial leathers.
[0031] The properties of the warp knit according to the present
invention are evaluated as follows:
[0032] Softness
[0033] Softness of the warp knit is evaluated from the sensitive
examination by ten specialists. If more than eight specialists
determine that the warp knit is soft, it is excellent. If
five.about.seven specialists determine that the warp knit is soft,
it is ordinary. If more than eight specialists determine that the
warp knit is not soft, it is poor.
[0034] Draping Property
[0035] Draping property of the warp knit is evaluated from the
sensitive examination by ten specialists. If more than eight
specialists determine that the warp knit has draping property, it
is excellent. If five.about.seven specialists determine that the
warp knit has draping property, it is ordinary. If more than eight
specialists determine that the warp knit has poor draping property,
it is poor.
[0036] Writing Effect
[0037] Writing effect of the warp knit is evaluated from the
sensitive examination by ten specialists. If more than eight
specialists determine that the warp knit has writing effect, it is
excellent. If five.about.seven specialists determine that the warp
knit has writing effect, it is ordinary. If more than eight
specialists determine that the warp knit has poor writing effect,
it is poor.
[0038] Appearance
[0039] Appearance of the warp knit is evaluated from the sensitive
examination by ten specialists. If more than eight specialists
determine that the warp knit has good appearance, it is excellent.
If five.about.seven specialists determine that the warp knit has
good appearance, it is ordinary. If more than eight specialists
determine that the warp knit has poor appearance, it is poor.
[0040] Shrinkage Rate of Boiling Water
[0041] Shrinkage rate of boiling water is measured according to
JIS-L-1073 methods.
[0042] Recovery Rate of Elongation (%)
[0043] Total measurement is carried out according to KSK 08125, but
proper elongation length when being elongated at the constant
velocity is output by using JIS L 1096. Both ends of a sample of
the warp knit with length of 10 cm and width of 15 cm are fixed to
Instron. The warp knit is elongated constantly at the stretching
velocity of 100 mm/min until the load of 750 g is reached. The warp
knit is left as it is with the load being removed. Next, the warp
knit is elongated at the constant velocity up to the original
position. And then, the warp knit is left as it is for three
minutes with the load being removed. The above process is
repeatedly carried out five times. Finally, the elongated length L
and the free elongated length L.sub.1 are measured. The free
elongated length L.sub.1 is obtained by subtraction of the length
measured after the warp knit is left as it is from the elongated
length L (See FIG. 1). The recovery rate of elongation is obtained
by putting the elongated length (L) and the free elongated length
(L.sub.1) in the following equation:
recovery rate of elongation (%)=[elongated length (L)-free
elongated length (L.sub.1)]/elongated length (L).times.100
[0044] Warping Property
[0045] Warping property is evaluated by checking the stop
times/hour of warping machine due to yarn defect. If the stop
times/hour is naught, it is excellent. If the stop times/hour is
one or two, it is ordinary. If the stop times/hour is more than 3
times, it is poor. The stop times/hour of warping machine is
calculated by dividing the total stop times of warping machine in
warping the yarn of 9 kg into total warping time.
[0046] Knitting Property
[0047] Knitting property is evaluated by checking the stop
times/hour of knitting machine due to yarn defect. If the stop
times/hour is naught, it is excellent. If the stop times/hour is
one or two, it is ordinary. If the stop times/hour is more than 3
times, it is poor. The stop times/hour of knitting machine is
calculated by dividing the total stop times of knitting machine in
a day into 24 hour.
[0048] Raising Property
[0049] Raising property of warp knit is evaluated from the
sensitive examination. If the raising of warp knit is finished well
by passing the raising machine 8 times at speed of 15 m/minute, it
is excellent. If the raising of warp knit is finished well by
passing the raising machine 10 times at speed of 15 m/minute, it is
ordinary. If the raising of warp knit is finished well by passing
the raising machine more then 10 times at speed of 15 m/minute, it
is poor.
BRIEF DESCRIPTION OF THE DRAWINGS
[0050] The preferred embodiment of the present invention will now
be described by way of example with reference to the accompanying
drawings in which:
[0051] FIG. 1 is a graph showing recovery rate of elongation of a
warp knit measured using an Instron in accordance with the present
invention.
BEST MODE FOR CARRYING OUT THE INVENTION
[0052] The present invention is now understood more concretely by
comparison between examples of the present invention and
comparative examples. However, the present invention is not limited
to such examples.
EXAMPLE 1
[0053] At first, prepare the raw warp knit with density of 23 C/CM
by using a extraction type composite fiber, which the fiber
formation component is polyethyleneterephtalate and the extraction
component is copolyester copolymerized with 7 mole % of dimethylene
sulfurisophthalic sodium, and which is prepared 0.05 denier of
ultra fine yarn after removing the extraction component, as a yarn
of the front surface layer, and then using copolyester yarn with
mono filament of 5 denier and shrinkage rate of boiling water of
28% (high shrinkage yarn) as a yarn of the rear surface layer. At
this time, content of the yarn of the rear surface layer is 26% in
weight to the total weight of processed warp knit. Next, treat the
manufactured raw warp knit by raising machine untill the shrinkage
of the warp knit is reached 50%. And then, after heating the warp
knit at 190.degree. C. preliminarily, dipping the warp knit in NaOH
solution (1% concentration) during 30 minutes at 98.degree. C. in
other to remove the extraction component of composite fiber. And
then prepare a processed warp knit by dyeing (with disperse dyes),
buffing and heating at 180.degree. C. finally the above mentioned
warp knit. And then, evaluate the properties of the processed warp
knit as above mentioned methods. The results of evaluation were
indicated in Table 1.
EXAMPLE 2
[0054] At first, prepare the raw warp knit with density of 23 C/CM
by using a extraction type composite fiber, which the fiber
formation component is polyethyleneterephtalate and the extraction
component is copolyester copolymerized with 7 mole % of dimethylene
sulfurisophthalic sodium, and which is prepared 0.07 denier of
ultra fine yarn after removing the extraction component, as a yarn
of the front surface layer, and then using copolyester yarn with
mono filament of 3 denier and shrinkage rate of boiling water of
34% (high shrinkage yarn) as a yarn of the rear surface layer. At
this time, content of the yarn of the rear surface layer is 31% in
weight to the total weight of processed warp knit. Next, treat the
manufactured raw warp knit by raising machine untill the shrinkage
of the warp knit is reached 55%. And then, after heating the warp
knit at 190.degree. C. preliminarily, dipping the warp knit in NaOH
solution (1% concentration) during 30 minutes at 98.degree. C. in
other to remove the extraction component of composite fiber. And
then prepare a processed warp knit by dyeing (with disperse dyes),
buffing and heating at 180.degree. C. finally the above mentioned
warp knit. And then, evaluate the properties of the processed warp
knit as above mentioned methods. The results of evaluation were
indicated in Table 1.
EXAMPLE 3
[0055] At first, prepare the raw warp knit with density of 23 C/CM
by using a extraction type composite fiber, which the fiber
formation component is polyethyleneterephtalate and the extraction
component is copolyester copolymerized with 7 mole % of dimethylene
sulfurisophthalic sodium, and which is prepared 0.04 denier of
ultra fine yarn after removing the extraction component, as a yarn
of the front surface layer, and then using copolyester yarn with
mono filament of 2.5 denier and shrinkage rate of boiling water of
28% (high shrinkage yarn) as a yarn of the rear surface layer. At
this time, content of the yarn of the rear surface layer is 55% in
weight to the total weight of processed warp knit. Next, treat the
manufactured raw warp knit by raising machine untill the shrinkage
of the warp knit is reached 50%. And then, after heating the warp
knit at 190.degree. C. preliminarily, dipping the warp knit in NaOH
solution (1% concentration) during 30 minutes at 98.degree. C. in
other to remove the extraction component of composite fiber. And
then prepare a processed warp knit by dyeing (with disperse dyes),
buffing and heating at 180.degree. C. finally the above mentioned
warp knit. And then, evaluate the properties of the processed warp
knit as above mentioned methods. The results of evaluation were
indicated in Table 1.
EXAMPLE 4
[0056] At first, prepare the raw warp knit with density of 23 C/CM
by using a extraction type composite fiber, which the fiber
formation component is polyethyleneterephtalate and the extraction
component is copolyester copolymerized with 7 mole % of dimethylene
sulfurisophthalic sodium, and which is prepared 0.2 denier of ultra
fine yarn after removing the extraction component, as a yarn of the
front surface layer, and then using copolyester yarn with mono
filament of 5 denier and shrinkage rate of boiling water of 28%
(high shrinkage yarn) as a yarn of the rear surface layer. At this
time, content of the yarn of the rear surface layer is 26% in
weight to the total weight of processed warp knit. Next, treat the
manufactured raw warp knit by raising machine untill the shrinkage
of the warp knit is reached 55%. And then, after heating the warp
knit at 190.degree. C. preliminarily, dipping the warp knit in NaOH
solution (1% concentration) during 30 minutes at 98.degree. C. in
other to remove the extraction component of composite fiber. And
then prepare a processed warp knit by dyeing (with disperse dyes),
buffing and heating at 180.degree. C. finally the above mentioned
warp knit. And then, evaluate the properties of the processed warp
knit as above mentioned methods. The results of evaluation were
indicated in Table 1.
Comparative Example 1
[0057] At first, prepare the raw warp knit with density of 23 C/CM
by using a extraction type composite fiber, which the fiber
formation component is polyethyleneterephtalate and the extraction
component is copolyester copolymerized with 7 mole % of dimethylene
sulfurisophthalic sodium, and which is prepared 0.05 denier of
ultra fine yarn after removing the extraction component, as a yarn
of the front surface layer, and then using copolyester yarn with
mono filament of 0.5 denier and shrinkage rate of boiling water of
40% (high shrinkage yarn) as a yarn of the rear surface layer. At
this time, content of the yarn of the rear surface layer is 48% in
weight to the total weight of processed warp knit. Next, treat the
manufactured raw warp knit by raising machine untill the shrinkage
of the warp knit is reached 50%. And then, after heating the warp
knit at 190.degree. C. preliminarily, dipping the warp knit in NaOH
solution (1% concentration) during 30 minutes at 98.degree. C. in
other to remove the extraction component of composite fiber. And
then prepare a processed warp knit by dyeing (with disperse dyes),
buffing and heating at 180.degree. C. finally the above mentioned
warp knit. And then, evaluate the properties of the processed warp
knit as above mentioned methods. The results of evaluation were
indicated in Table 1.
Comparative Example 2
[0058] At first, prepare the raw warp knit with density of 23 C/CM
by using a extraction type composite fiber, which the fiber
formation component is polyethyleneterephtalate and the extraction
component is copolyester copolymerized with 7 mole % of dimethylene
sulfurisophthalic sodium, and which is prepared 0.05 denier of
ultra fine yarn after removing the extraction component, as a yarn
of the front surface layer, and then using polyester yarn with mono
filament of 20 denier as a yarn of the rear surface layer. At this
time, content of the yarn of the rear surface layer is 42% in
weight to the total weight of processed warp knit. Next, treat the
manufactured raw warp knit by raising machine untill the shrinkage
of the warp knit is reached 50%. And then, after heating the warp
knit at 190.degree. C. preliminarily, dipping the warp knit in NaOH
solution (1% concentration) during 30 minutes at 98.degree. C. in
other to remove the extraction component of composite fiber. And
then prepare a processed warp knit by dyeing (with disperse dyes),
buffing and heating at 180.degree. C. finally the above mentioned
warp knit. And then, evaluate the properties of the processed warp
knit as above mentioned methods. The results of evaluation were
indicated in Table 1.
Comparative Example 3
[0059] At first, prepare the raw warp knit with density of 23 C/CM
by using a extraction type composite fiber, which the fiber
formation component is polyethyleneterephtalate and the extraction
component is copolyester copolymerized with 7 mole % of dimethylene
sulfurisophthalic sodium, and which is prepared 1.3 denier of ultra
fine yarn after removing the extraction component, as a yarn of the
front surface layer, and then using polyester yarn with mono
filament of 20 denier as a yarn of the rear surface layer. At this
time, content of the yarn of the rear surface layer is 42% in
weight to the total weight of processed warp knit. Next, treat the
manufactured raw warp knit by raising machine untill the shrinkage
of the warp knit is reached 50%. And then, after heating the warp
knit at 190.degree. C. preliminarily, dipping the warp knit in NaOH
solution (1% concentration) during 30 minutes at 98.degree. C. in
other to remove the extraction component of composite fiber. And
then prepare a processed warp knit by dyeing (with disperse dyes),
buffing and heating at 180.degree. C. finally the above mentioned
warp knit. And then, evaluate the properties of the processed warp
knit as above mentioned methods. The results of evaluation were
indicated in Table 1.
Comparative Example 4
[0060] Except using the ultra fine polyester yarn with mono
filament of 0.04 denier, made by direct spinning, as the yarn of
the front surface layer, prepare a warp knit by same process and
condition as example 1. And then, evaluate the properties of the
processed warp knit as above mentioned methods. The results of
evaluation were indicated in Table 1.
1TABLE 1 Results of property evaluation of warp knit Example
Comparative example Class 1 2 3 4 1 2 3 4 Softeness E E E E O P P E
Draping property E E E O P E O O Writing effect E E E E E P P P
Appearance E E O O O O P O Warping property E E E E E E O P
Knitting property E E E E O E E P Raising property O O O E O O P P
Recovery In the direction 20.01 12.36 18.00 16.27 19.77 10.40 14.88
7.87 rate of of wale elongation In the direction 18.57 13.00 15.23
15.33 17.23 13.26 16.29 6.90 (%) of course (The E means excellent,
O means ordinary and P means poor in the table 1)
[0061] Industrial Applicability
[0062] As described above, the warp knit according to the present
invention has excellent touch, appearance, shape stability rate,
draping property, and thus is useful for materials of artificial
leathers or ladies' clothes. Furthermore, the process of preparing
such a warp knit according to the present invention has very
excellent warping property and knitting property.
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