U.S. patent application number 09/856314 was filed with the patent office on 2002-11-14 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 | 20020166348 09/856314 |
Document ID | / |
Family ID | 27350112 |
Filed Date | 2002-11-14 |
United States Patent
Application |
20020166348 |
Kind Code |
A1 |
Yoon, Joon Young ; et
al. |
November 14, 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 comprising three layers, namely a
front surface layer, a rear surface layer, and an intermediate
layer arranged between the front surface layer and the rear surface
layer, the front surface layer consisting of ultra fine yarn with
mono-filament denier of 0.01.about.0.3 denier, the intermediate
layer consist of spandex elastic yarn, 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 25.about.60
%. 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.: |
09/856314 |
Filed: |
May 21, 2001 |
PCT Filed: |
November 30, 2000 |
PCT NO: |
PCT/KR00/01196 |
Current U.S.
Class: |
66/196 |
Current CPC
Class: |
Y10T 442/438 20150401;
D04B 21/18 20130101; Y10T 442/45 20150401; Y10T 442/456 20150401;
D04B 21/16 20130101; D04B 21/00 20130101; D10B 2401/18 20130101;
Y10T 442/413 20150401; Y10T 428/2915 20150115 |
Class at
Publication: |
66/196 |
International
Class: |
D04B 021/00; D04B
007/04; D04B 011/04 |
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, comprising: three layers,
namely a front surface layer, a rear surface layer, and an
intermediate layer arranged between the front surface layer and the
rear surface layer, the front surface layer consisting of ultra
fine yarn with mono-filament denier of 0.01.about.0.3 denier, the
intermediate layer consist of spandex elastic yarn, 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
25.about.60%.
2. 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.87% in weight of the total weight of the
processed warp knit.
3. The warp knit having excellent touch as claimed in claim 1,
wherein content of the spandex elastic yarn constituting the
intermediate layer is 3.about.20% 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 synthetic yarn or the high shrinkage yarn
constituting the rear surface layer is 10.about.57% 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 density of the processed warp knit is 40.about.80
each/inch.
6. The warp knit having excellent touch as claimed in claim 1,
wherein the ultra fine yarn and the synthetic yarn are polyester
yarn.
7. 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.
8. 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.0.3 denier and a extraction component as a yarn of a
front surface layer, a spandex elastic yarn as a yarn of an
intermediate layer, and a polyester 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.
9. The process of preparing a warp knit having excellent touch as
claimed in claim 8, wherein ratio in weight of the yarn of the
front surface layer: the yarn of the intermediate layer: the yarn
of the rear surface layer is 40.about.87% in weight: 3.about.20% in
weight: 10.about.57% 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.
Furthermore, the warp knit prepared by means of the afore-said
process is inferior in shape stability and flexibility thereof.
[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,
flexibility, 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 comprising three layers, namely a front surface layer, a rear
surface layer, and an intermediate layer arranged between the front
surface layer and the rear surface layer, the front surface layer
consisting of ultra fine yarn with mono-filament denier of
0.01.about.0.3 denier, the intermediate layer consisting of spandex
elastic yarn, 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 25.about.60%.
[0012] The present invention also relates to 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.0.3 denier and a extraction
component as a yarn of a front surface layer, a spandex elastic
yarn as a yarn an intermediate layer, and a polyester 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 yarn, 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.0.3 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.0.3 denier is only remained. If the mono-filament denier
of the yarn at the front surface layer is more than 0.3 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 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. The
content of the extraction component in the composite fiber is
generally 20.about.40% in weight.
[0017] 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.
[0018] Accordingly, the present invention is characterized in that
spandex elastic yarn are used as yarn of the intermediate layer,
whereby the yarn density of the front surface layer is increased by
virtue of the shrinkage of the intermediate layer. The spandex
elastic yarn, which is yarn of the intermediate layer, is of
excellent shrinking property, therefore it increases the yarn
density of the front surface layer on the finished warp knit, and
provides good touch, flexibility and repulsiveness to the warp
knit. The total denier of the spandex elastic yarn is preferably
between 30 and 90 denier.
[0019] Next, synthetic yarn with mono-filament denier of 1.about.5
denier, more preferably of polyester yarn or high shrinkage yarn,
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. If the regular polyester yarn is used
as the yarn of the rear surface layer, mechanical stability and
shape stability of the warp knit is improved. Concretely, of 50
denier/24 filament of polyester yarn is used as the yarn of the
rear surface layer. The high shrinkage yarn has high shrinkage rate
of boiling water, whereby it is prevented that ultra fine yarn are
come out of the rear surface layer.
[0020] 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.
[0021] 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.
[0022] The content of the yarn of the front surface layer when it
is knitted is preferably 40.about.87% 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 87% in weight, the draping property and the mechanical
property of the warp knit is deteriorated as the content of the
yarn of the intermediate layer and the yarn of the rear surface
layer are little relatively.
[0023] On the other hand, the content of the yarn of the
intermediate layer and the yarn of the rear surface layer is
preferably 3.about.20% in weight and 10.about.57% in weight of the
total weight of the processed warp knit, respectively. If the
content of the yarn of the intermediate layer and the yarn of the
rear surface layer is more than the range as mentioned above
respectively, the touch of the warp knit is poor; and if the
content of the yarn of the intermediate layer and the yarn of the
rear surface layer is less than the range as mentioned above
respectively, the shape stability and the draping property of the
warp knit are deteriorated.
[0024] 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. It is preferable to maintain the density of the
processed warp knit at 40.about.80 each/inch so that excellent
touch and the shape stability is obtained.
[0025] The warp knit of the present invention is composed densely
out of ultra fine yarn with mono-filament denier of 0.01.about.0.3
denier, whereby its touch and appearance are very excellent.
Especially, as the warp knit of the present invention includes the
intermediate layer consisting of spandex elastic yarn with
excellent flexibility, 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
25.about.60%, which represents excellence. Also, as the warp knit
of the present invention includes the rear surface layer consisting
of the yarn of regular synthetic yarn with mono-filament denier of
1.about.5 denier, the shape stability and the mechanical property
of the warp knit are excellent.
[0026] As described in detail above, the warp knit of the present
invention has excellent touch, appearance, flexibility, shape
stability, and draping property, and thus it is suitable for
materials of ladies' clothes or materials of artificial
leathers.
[0027] The properties of the warp knit according to the present
invention are evaluated as follows:
[0028] Softness
[0029] 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.
[0030] Draping Property
[0031] 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.
[0032] Writing Effect
[0033] 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 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.
[0034] Appearance
[0035] 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.
[0036] Recovery Rate of Elongation (%)
[0037] 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
BRIEF DESCRIPTION OF THE DRAWINGS
[0038] The preferred embodiment of the present invention will now
be described by way of example with reference to the accompanying
drawings in which:
[0039] 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
[0040] 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
[0041] At first, prepare the raw warp knit 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 spandex elastic yarn of
40 denier/5 filamnet as a yarn of the intermediate layer, and then
using polyester yarn with mono filament of 5 denier as a yarn of
the rear surface layer. At this time, ratio in weight of the yarn
of the front surface layer: the yarn of the intermediate layer: the
yarn of the rear surface layer is 55% in weight:10% in weight:35%
in weight. 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 having the density of 60 each/inch 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
[0042] At first, prepare the raw warp knit 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 spandex elastic yarn of
40 denier/5 filamnet as a yarn of the intermediate layer, and then
using polyester yarn with mono filament of 3 denier as a yarn of
the rear surface layer. At this time, ratio in weight of the yarn
of the front surface layer:the yarn of the intermediate layer:the
yarn of the rear surface layer is 60% in weight:5% in weight:35% in
weight. 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 having the density of 55 each/inch 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
[0043] At first, prepare the raw warp knit 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 spandex elastic yarn of
40 denier/5 filamnet as a yarn of the intermediate 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, ratio in weight of the yarn of
the front surface layer:the yarn of the intermediate layer:the yarn
of the rear surface layer is 55% in weight:10% in weight:35% in
weight. 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 having the density of 60 each/inch 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
[0044] At first, prepare the raw warp knit 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 spandex elastic yarn of
40 denier/5 filamnet as a yarn of the intermediate layer, and then
using copolyester yarn of with mono filament 3 denier and shrinkage
rate of boiling water of 20% (high shrinkage yarn) as a yarn of the
rear surface layer. At this time, ratio in weight of the yarn of
the front surface layer: the yarn of the intermediate layer: the
yarn of the rear surface layer is 60% in weight: 5% in weight: 35%
in weight. 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 having the density of 55 each/inch 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
[0045] At first, prepare the raw warp knit 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 0.5 denier as a yarn of the rear surface layer. At this
time, ratio in weight of the yarn of the front surface layer:the
yarn of the rear surface layer is 55% in weight:45% in weight.
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 having the density of 60 each/inch 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
[0046] At first, prepare the raw warp knit 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 0.4 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 0.5 denier as a yarn of the rear surface layer. At this
time, ratio in weight of the yarn of the front surface layer:the
yarn of the rear surface layer is 60% in weight:40% in weight.
Next, treat the manufactured raw warp knit by raising machine
untill the shrinkage of the warp knit is reached 20%. 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 having the density of 60 each/inch 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
[0047] At first, prepare the raw warp knit 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 10 denier as a yarn of the rear surface layer. At this
time, ratio in weight of the yarn of the front surface layer:the
yarn of the rear surface layer is 55% in weight:45% in weight.
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 having the density of 60 each/inch 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
[0048] At first, prepare the raw warp knit 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 0.5 denier as a yarn of the rear surface layer. At this
time, ratio in weight of the yarn of the front surface layer:the
yarn of the rear surface layer is 55% in weight:45% in weight.
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 having the density of 60 each/inch 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 5
[0049] At first, prepare the raw warp knit 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 10 denier as a yarn of the rear surface layer. At this
time, ratio in weight of the yarn of the front surface layer:the
yarn of the rear surface layer is 55% in weight:45% in weight.
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 having the density of 60 each/inch 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.
1TABLE 1 Results of property evaluation of warp knit Recovery rate
of elongation (%) In the In the Draping Witting direction direction
Class softness property effect appearance of wale of course Example
1 Excellent Excellent Excellent Excellent 41.9 37.6 Example 2
Excellent Excellent Excellent Excellent 35.7 32.8 Example 3
Excellent Excellent Excellent Excellent 42.2 38.7 Example 4
Excellent Excellent Excellent Excellent 36.1 33.5 Comparative
Ordinary Poor Excellent Ordinary 20.0 18.6 example 1 Comparative
Poor Excellent Poor Ordinary 15.9 17.2 example 2 Comparative Poor
Excellent Excellent Ordinary 10.4 13.0 example 3 Comparative
Ordinary Poor Excellent Ordinary 20.2 18.6 example 4 Comparative
Poor Excellent Excellent Ordinary 10.4 13.0 example 5
INDUSTRIAL APPLICABILITY
[0050] As described above, the warp knit according to the present
invention has excellent touch, appearance, elastic recovery 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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