U.S. patent application number 17/621131 was filed with the patent office on 2022-07-21 for production method for garment, dyed cloth, and chemical agent.
The applicant listed for this patent is SAAB Co. Ltd., Yuken Chemical CO., LTD.. Invention is credited to Haruki Takeda.
Application Number | 20220228314 17/621131 |
Document ID | / |
Family ID | 1000006315511 |
Filed Date | 2022-07-21 |
United States Patent
Application |
20220228314 |
Kind Code |
A1 |
Takeda; Haruki |
July 21, 2022 |
PRODUCTION METHOD FOR GARMENT, DYED CLOTH, AND CHEMICAL AGENT
Abstract
[Problem] The present invention addresses the problem of
providing: a method for producing garments that use dyed cloth on
which whiteness easily emerges due to heating by irradiation with
laser or the like and which can be efficiently decolorized; dyed
cloth used in production of decolorized garments; and a chemical
agent used in decolorization of dyed cloth. [Solution] This
production method for garments is characterized by using a heat
treatment to decolorize garments which use dyed cloth containing an
alkanolamine. The temperature of the heat treatment is preferably
160-180.degree. C., and the heat treatment is more preferably a
laser machining treatment.
Inventors: |
Takeda; Haruki;
(Imabari-city, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Yuken Chemical CO., LTD.
SAAB Co. Ltd. |
Imabari-city
Hiratsuka-city |
|
JP
JP |
|
|
Family ID: |
1000006315511 |
Appl. No.: |
17/621131 |
Filed: |
December 4, 2020 |
PCT Filed: |
December 4, 2020 |
PCT NO: |
PCT/JP2020/045252 |
371 Date: |
March 30, 2022 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
D06P 5/131 20130101;
D06P 5/2077 20130101; D06M 10/005 20130101; D06P 5/2005 20130101;
D06P 5/137 20130101; D06P 1/645 20130101; D06M 13/325 20130101 |
International
Class: |
D06P 5/13 20060101
D06P005/13; D06P 5/20 20060101 D06P005/20; D06P 1/645 20060101
D06P001/645; D06M 10/00 20060101 D06M010/00; D06M 13/325 20060101
D06M013/325 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 29, 2019 |
JP |
2019-240232 |
Claims
1. A garment production method characterized by using a heat
treatment to decolorizing a garment which uses a dyed cloth
containing an alkanolamine with a heat treatment.
2. The garment production method according to claim 1, wherein the
temperature of the heat treatment is from 150.degree. C. to
200.degree. C.
3. The garment production method according to claim 1, wherein the
temperature of the heat treatment is from 160.degree. C. to
180.degree. C.
4. The garment production method according to claim 1, wherein the
heat treatment is a laser machining treatment.
5. The garment production method according to claim 1, wherein the
garment which uses a dyed cloth containing an alkanolamine is a
garment which uses a dyed cloth obtained by contacting with a
solution containing an alkanolamine, or a garment obtained from a
dyed cloth obtained by contacting with a solution containing an
alkanolamine.
6. The garment production method according to claim 5, wherein the
solution containing an alkanolamine further comprises a pH
adjusting agent.
7. The garment production method according to claim 5, wherein the
solution containing an alkanolamine further comprises an organic
acid.
8. A dyed cloth containing an alkanolamine.
9. The dyed cloth according to claim 8 for performing
decolorization by means of a heat treatment.
10. The dyed cloth according to claim 9, wherein the heat treatment
is a laser machining treatment.
11. The dyed cloth according to claim 8, further comprising a pH
adjusting agent.
12. The dyed cloth according to claim 8, further comprising an
organic acid.
13. A chemical agent containing an alkanolamine, wherein the
chemical agent is used for decolorizing, by means of a heat
treatment, a garment produced using a dyed cloth into which an
alkanolamine has been incorporated using the chemical agent, or a
garment resulting from incorporating, with the chemical reagent, an
alkanolamine into a garment which uses a dyed cloth.
14. The chemical agent according to claim 13, wherein the chemical
agent containing an alkanolamine further comprises a pH adjusting
agent.
15. The chemical agent according to claim 13, wherein the chemical
agent containing an alkanolamine further comprises an organic
acid.
16. The chemical agent according to claim 13, wherein the heat
treatment is a laser machining treatment.
Description
TECHNICAL FIELD
[0001] The present invention relates to a production method for a
decolorized garment, and a dyed cloth and a chemical agent to be
used in the production of such a garment.
BACKGROUND ART
[0002] One example of a dyed fiber product is a fiber product using
a denim cloth, typified by jeans, etc. For jeans, etc., the feeling
of a new product that has just been dyed is sometimes desired, but
consumers widely prefer a fabric that has been nicely faded due to
use, or a fabric that has a vintage feel that comes with age.
However, it takes too much time to impart a fabric with a vintage
feel by means of actual use, and with used clothing, the fabric
might actually be damaged, or there may be no demand from customers
that do not like used clothing. Therefore, many methods for
imparting a vintage feel by subjecting a new cloth, etc. to a
decolorization treatment in advance have been widely
researched.
[0003] Some conventionally used decolorization methods include a
method of blurring or scraping the dye in the fiber product to be
decolorized through physical friction such as a stonewashing
method, a sandpaper and grinding method, and a sandblasting method,
as well as a method of chemically decolorizing the fiber product by
submerging a pair of jeans, etc., in a prescribed chemical liquid
of an electrolytic bath, and the like.
[0004] However, in the methods for physically decolorizing a fiber
product, there has been a problem in that removing any stones, etc.
which have become embedded in the fibers after decolorization
requires time and effort. Further, in the methods for chemical
decolorization, there has been a problem in that treating the used
chemical liquid requires time and effort. In addition, in all of
the conventional methods, there has been a problem in that it is
difficult to impart a vintage feel accurately and with a natural
texture at the desired locations of the cloth.
[0005] As a means for solving the problems found in these physical
and chemical methods, a method of irradiating a laser onto a
location to be decolorized has been disclosed (for example, see
Patent Document 1 below).
[0006] A method achieved by laser irradiation imparts whiteness to
a denim cloth by decomposing the indigo dye on the surface of the
cloth with the laser.
PRIOR ART DOCUMENTS
Patent Documents
[0007] Patent Document 1: JP H10-102386 A
SUMMARY OF INVENTION
Technical Problem
[0008] However, in the conventional method achieved by laser
irradiation as disclosed in Patent Document 1, etc., the laser is
irradiated only on the surface of the denim cloth, and thus only
the surface of the cloth was able to be decolorized. Therefore,
there was a problem in that upon washing after the decolorization
by laser irradiation, the layer that was irradiated with the laser
is removed and an underlying layer which was not fully decolorized
appears, and thus the whiteness does not readily emerge.
[0009] Thus, the present invention addresses the problem of
providing a method for producing garments that use dyed cloth on
which whiteness easily emerges due to heating by irradiation with a
laser or the like and which can be efficiently decolorized, a dyed
cloth to be used in the production of decolorized garments, and a
chemical agent to be used in the decolorization of dyed cloth.
Solution to Problem
[0010] As a result of earnest research in order to solve the
above-described problem, the present inventors discovered that a
dyed cloth can be decolorized from the depths thereof while
preventing deterioration of the cloth by performing a heat
treatment with a means such as a laser on the dyed cloth which
comprises a specific chemical agent, and thereby the present
invention was completed.
[0011] The present invention is specified by the matters shown
below.
[0012] (1) A garment production method characterized by
decolorizing a garment which uses a dyed cloth containing an
alkanolamine with a heat treatment.
[0013] (2) The garment production method according to (1), wherein
the temperature of the heat treatment is from 150.degree. C. to
200.degree. C.
[0014] (3) The garment production method according to (1), wherein
the temperature of the heat treatment is from 160.degree. C. to
180.degree. C.
[0015] (4) The garment production method according to any one of
(1) to (3), wherein the heat treatment is a laser machining
treatment.
[0016] (5) The garment production method according to any one of
(1) to (4), wherein the garment which uses a dyed cloth containing
an alkanolamine is a garment which uses a dyed cloth obtained by
contacting with a solution containing an alkanolamine, or a garment
obtained from a dyed cloth obtained by contacting with a solution
containing an alkanolamine.
[0017] (6) The garment production method according to (5), wherein
the solution containing an alkanolamine further comprises a pH
adjusting agent.
[0018] (7) The garment production method according to (5) or (6),
wherein the solution containing an alkanolamine further comprises
an organic acid.
[0019] (8) A dyed cloth containing an alkanolamine.
[0020] (9) The dyed cloth according to (8) for performing
decolorization by means of a heat treatment.
[0021] (10) The dyed cloth according to (8) or (9), wherein the
heat treatment is a laser machining treatment.
[0022] (11) The dyed cloth according to any one of (8) to (10),
further comprising a pH adjusting agent.
[0023] (12) The dyed cloth according to any one of (8) to (11),
further comprising an organic acid.
[0024] (13) A chemical agent containing an alkanolamine, wherein
the chemical agent is used for decolorizing, by means of a heat
treatment, a garment produced using a dyed cloth into which an
alkanolamine has been incorporated using the chemical agent, or a
garment resulting from incorporating, with chemical reagent, an
alkanolamine into a garment which uses a dyed cloth.
[0025] (14) The chemical agent according to (13), wherein the
chemical agent containing an alkanolamine further comprises a pH
adjusting agent.
[0026] (15) The chemical agent according to (13) or (14), wherein
the chemical agent containing an alkanolamine further comprises an
organic acid.
[0027] (16) The chemical agent according to any one of (13) to
(15), wherein the heat treatment is a laser machining
treatment.
Effects of Invention
[0028] By using the method of the present invention, an effect is
achieved in that a dyed cloth can be easily decolorized to a high
degree of whiteness, and garments which use a dyed cloth with a
vintage feel can be efficiently produced.
BRIEF DESCRIPTION OF DRAWINGS
[0029] FIG. 1(a) illustrates a pair of jeans which have been
subjected to decolorization processing as obtained in Example 1.
FIG. 1(b) illustrates a pair of jeans which have been subjected to
decolorization processing as obtained in Comparative Example 1.
[0030] FIG. 2(a) illustrates a pair of jeans which have been
subjected to decolorization processing as obtained in Example 2.
FIG. 2(b) illustrates a pair of jeans which have been subjected to
decolorization processing as obtained in Comparative Example 2.
[0031] FIG. 3(a) illustrates a pair of jeans which have been
subjected to decolorization processing as obtained in Example 3.
FIG. 3(b) illustrates a pair of jeans which have been subjected to
decolorization processing as obtained in Comparative Example 3.
DESCRIPTION OF EMBODIMENTS
[0032] The garment production method of the present invention is
characterized by decolorizing a garment which uses a dyed cloth
containing an alkanolamine with a heat treatment.
[0033] The "garment which uses a dyed cloth containing an
alkanolamine" is a garment which uses a dyed cloth obtained by
contacting with a solution containing an alkanolamine (i.e. a
chemical agent containing an alkanolamine; the same meaning will
apply hereinafter in the specification of the present application),
or a garment obtained from a dyed cloth obtained by contacting with
a solution containing an alkanolamine.
[0034] The former garment (the garment which uses a dyed cloth
obtained by contacting with a solution containing an alkanolamine)
indicates a garment obtained by incorporating an alkanolamine into
a garment produced by cutting and sewing, etc. a dyed cloth that
does not contain an alkanolamine.
[0035] The latter garment (garment obtained from a dyed cloth
obtained by contacting with a solution containing an alkanolamine)
indicates a garment produced by cutting and sewing, etc. a dyed
cloth that contains an alkanolamine.
[0036] The dyed cloth which is a textile of a garment to be used in
the production method of the present invention generally indicates
a thick woven fabric of a cotton material obtained by twill weaving
warp yarns of at least 10-count, which have been dyed by a natural
or synthetic indigo dye or a sulfur dye, and non-dyed unbleached
yarns as the weft yarns.
[0037] As the fibers used for the above-mentioned yarns, mention
may be made of cellulose-based natural fibers such as cotton,
cellulose-based semi-synthetic fibers such as acetate,
cellulose-based regenerated fibers such as rayon and cupra, and
mixtures of these fibers with synthetic fibers, etc.
[0038] The type of the denim cloth is not particularly limited, and
mention may be made of right-hand twill, left-hand twill, broken
twill, dungaree, colored denim, coated denim, and stretch denim,
etc.
[0039] The garment to be used in the production method of the
present invention is not particularly limited as long as it is worn
by a person to partially or fully cover the body, and mention may
be made of a top such as a shirt and a blouse, and a bottom such as
denim pants and jeans, etc. The garment may also include
accessories and goods such as a bag, a purse, etc.
[0040] The alkanolamine to be used in the production method of the
present invention is not particularly limited as long as it is a
compound which has an alkane structure having a hydroxy group and
an amino group in the molecule, and the amino group may be
substituted. As such alkanolamines, mention may be made of
monoethanolamine, 1,1-dimethylethanolamine, diethanolamine,
triethanolamine, N-methylethanolamine, N,N-dimethylethanolamine,
N-methyldiethanolamine, 2-aminoethoxyethanol,
N-aminoethylethanolamine, heptaminol, propanolamine, methanolamine,
alaninol, serinol, cysteinol, threoniol, prolinol, valinol,
leucinol, isoleucinol, methioninol, phenylalaninol, tyrosinol,
tryptophanol, asaraginol, alapaltol, glutaminol, glutamol, ricinol,
histidinol, argininol, ornithol, canalinol, etc.
[0041] As the method for incorporating an alkanolamine into the
garment which uses a dyed cloth, mention may be made of a method in
which the garment which uses a dyed cloth is contacted with a
solution containing an alkanolamine, or a method in which a dyed
cloth (a so-called tanmono) is contacted with a solution containing
an alkanolamine and then the obtained dyed cloth is used to produce
a garment.
[0042] The method for contacting the garment or dyed cloth
(hereinafter referred to as "garment, etc.") with an alkanolamine
is not particularly limited, and a method in which the garment,
etc. is submerged in a solution containing an alkanolamine, a
method in which the garment, etc. is dipped in a solution
containing an alkanolamine and then further wrung out, a method in
which a solution containing an alkanolamine is coated onto the
garment, etc. by spraying, by a doctor-type coating machine, etc.,
a method in which the garment, etc. is stirred in a solution
containing an alkanolamine, a method in which the garment, etc. is
placed in or passed through a shower of a solution containing an
alkanolamine, and a method in which a solution containing an
alkanolamine is padded onto the garment, etc. Further, a solution
tank in which the garment, etc. has been dipped can be vibrated
with ultrasonic waves in order to impregnate a solution containing
an alkanolamine into the fibers of the garment, etc.
[0043] In the above methods, after the garment, etc. has been
contacted with a solution containing an alkanolamine, a drying step
may be provided as appropriate. The drying temperature is not
particularly limited as long as the temperature is equal to or
lower than the boiling point of the alkanolamine, but the drying
temperature should be a temperature at which a solvent included in
the solution containing an alkanolamine can be vaporized (may be a
temperature equal to or lower than the boiling point of the
solvent).
[0044] The solution containing an alkanolamine may be a 100%
alkanolamine solution, but is preferably a solution in which an
alkanolamine is diluted with a solvent. As a solvent to be used for
the solution containing an alkanolamine, a solvent which can
dissolve the alkanolamine and which does not damage the dyed cloth
material is preferable. Specifically, mention may be made of water,
methanol, ethanol, and ammonia water, etc., but water is
particularly preferred.
[0045] The content of the alkanolamine in the solution containing
an alkanolamine is not particularly limited as long as the
alkanolamine is dissolved in the solvent, but an amount of
alkanolamine sufficient to enable decolorization by means of a heat
treatment should be incorporated in the dyed cloth. The content of
the alkanolamine in the solution containing an alkanolamine is
preferably in the range of 0.01 to 0.3% by mass, and most
preferably in the range of 0.1 to 0.3% by mass.
[0046] Normally, the solution containing an alkanolamine is
preferably prepared by diluting a highly-concentrated solution
containing an alkanolamine and other components (a pH adjusting
agent, an organic acid, an oxidizing agent, a metal salt, a
surfactant, an acidic substance, a basic substance, a thickening
agent, etc.) (hereinafter referred to as a "highly-concentrated
alkanolamine solution") with a solvent before use.
[0047] The content of the alkanolamine in the highly-concentrated
alkanolamine solution is preferably in the range of 1 to 15% by
mass, and more preferably in the range of 10 to 15% by mass.
[0048] A pH adjusting agent is preferably included in the solution
containing an alkanolamine. The pH adjusting agent is not
particularly limited as long as the pH can be adjusted to a
prescribed pH range. As the pH adjusting agent, mention may be made
specifically of an acetate buffer solution (acetic acid+sodium
acetate), a phosphate buffer solution (phosphoric acid+sodium
phosphate, sodium dihydrogenphosphate+sodium hydrogenphosphate), a
citrate buffer solution (citric acid+sodium citrate), a tartrate
buffer solution (tartaric acid+sodium tartrate), a borate buffer
solution (boric acid+sodium hydroxide or potassium hydroxide), an
ethanolamine acetate buffer solution (acetic acid+ethanolamine), a
phosphate-citrate buffer solution (citric acid+sodium
dihydrogenphosphate), a Tris buffer solution, a phosphate buffer
physiological saline, an EDTA buffer solution (EDTA disodium
salt+sodium hydroxide), a Tris EDTA buffer solution (Tris
hydrochloric acid buffer solution+EDTA) , a Tris acetate EDTA
buffer solution (Tris base+acetic acid+EDTA), a Tris borate EDTA
buffer solution (Tris base+boric acid+EDTA), a concentrated SSC
buffer solution (NaCl+trisodium citrate+sodium hydroxide), and a
concentrated SSPE buffer solution (NaCl+sodium
dihydrogenphosphate+EDTA+sodium hydroxide), etc.
[0049] Among the above, the pH adjusting agent is preferably added
to the solution containing an alkanolamine so that the pH of the
dyed cloth containing the alkanolamine is between 4 to 6 (the pH
value is measured as follows based on "JIS L 1096: Testing methods
for woven and knitted fabrics": 50 ml of distilled water is placed
in a glass flask and boiled for two minutes; 5.0 g of finely cut
test pieces (denim cloth) are loaded therein, and then the glass
flask is corked and left as is for 30 minutes; an extraction liquid
thereof is adjusted to 25.degree. C..+-.2.degree. C.; and the pH of
the extraction liquid is measured with a pH meter).
[0050] The content of the pH adjusting agent is not particularly
limited as long as it is in a range in which the pH can be adjusted
to the above-mentioned pH range, but the content is preferably in
the range of 5 to 40% by mass, and more preferably in the range of
10 to 25% by mass, with respect to the total amount of the
highly-concentrated alkanolamine solution.
[0051] An organic acid is preferably further included in the
solution containing an alkanolamine. As the organic acid to be
included in the solution containing an alkanolamine, mention may be
made specifically of acetic acid, propionic acid, citric acid,
lactic acid, tartaric acid, and malic acid, etc. In particular,
water-soluble organic acids are preferred examples.
[0052] The content of the organic acid is not particularly limited,
but the content is preferably in the range of 1 to 30% by mass,
more preferably in the range of 2 to 25% by mass, and even more
preferably in the range of 10 to 20% by mass in the
highly-concentrated alkanolamine solution.
[0053] An oxidizing agent, a metal salt, a surfactant, an acidic
substance, a basic substance, a thickening agent, etc. may also be
included, as necessary, in the solution containing an
alkanolamine.
[0054] As the oxidizing agent to be included in the solution
containing an alkanolamine, mention may be made of oxygen-based
oxidizing agents such as hydrogen peroxide and sodium persulfate,
or halogen-based oxidizing agents such as hypochlorites such as
sodium hypochlorite, potassium hypochlorite, and calcium
hypochlorite, hypoiodite and hypobromite, etc.
[0055] As the metal salt to be included in the solution containing
an alkanolamine, mention may be made of alkali metal salts such as
sodium chloride and potassium chloride, alkaline earth metal salts
such as magnesium chloride and calcium chloride, and aluminum salts
such as aluminum oxide, aluminum sulfate, and aluminum nitrate,
etc.
[0056] As the surfactant to be included in the solution containing
an alkanolamine, mention may be made of anionic surfactants such as
a long-chain alkyl fatty acid salt, linear alkylbenzene sulfonate,
.alpha.-sulfo fatty acid methyl ester salt, .alpha.-olefin
sulfonate, dialkyl succinate, naphthalene sulfonic
acid-formaldehyde condensate, and alkyl sulfate ester salt, etc.,
and nonionic surfactants such as glycerin fatty acid ester,
sorbitan fatty acid ester, sucrose fatty acid ester,
polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether,
polyoxyethylene polyoxypropylene glycol, etc.
[0057] As the acidic substance to be included in the solution
containing an alkanolamine, mention may be made of inorganic acids
such as phosphoric acid and sulfamic acid, etc. As the basic
substance, mention may be made of sodium silicate and caustic soda,
etc.
[0058] As the thickening agent to be included in the solution
containing an alkanolamine, mention may be made of a methyl
cellulose-based thickening agent and a methyl starch-based
thickening agent, etc. A thickening agent is suitably used in the
case that the solution containing an alkanolamine is to be coated
by a doctor-type coating machine, etc.
[0059] In the production method of the present invention, the
garment, etc. obtained as described above is decolorized by
performing a heat treatment.
[0060] The heat treatment method is not particularly limited as
long as it is a method with which heat can be applied to the cloth
containing an alkanolamine, but, for example, the garment, etc. is
preferably heated by laser irradiation.
[0061] The heating temperature can be arbitrarily determined
depending on the type of the alkanolamine and the type of the dyed
cloth, and is preferably from 150.degree. C. to 200.degree. C.,
more preferably from 160.degree. C. to 180.degree. C.
[0062] The method for irradiating a laser beam is not particularly
limited, but normally mention may be made of a method in which a
laser beam is irradiated on the surface of the dyed cloth by
scanning a narrowed beam.
[0063] The method for scanning a laser beam is not particularly
limited, but mention may be made of a method in which an object to
be irradiated is immobilized in advance and then a laser beam is
two-dimensionally scanned onto the object, a method in which the
object to be irradiated is moved and the laser beam is
one-dimensionally operated in a direction intersecting the movement
direction of the object, a method in which scanning is performed
using a reflective mirror, etc. capable of rotary movement, and a
method in which a laser beam is irradiated on only a portion
corresponding to a desired irradiation pattern by opening and
closing a shutter in an optical path, etc.
[0064] The laser irradiation duration and frequency are not
particularly limited, but, for example, the laser may be irradiated
once or multiple times for from 0.1 seconds to 5 minutes at a
time.
[0065] The wavelength of the laser beam is not particularly
limited, but is preferably a wavelength that is absorbed by a
dye.
[0066] The type of laser is not particularly limited, but any of a
gas laser, a solid-state laser, or a semiconductor laser can be
used. A carbon dioxide gas laser which is a high-output infrared
laser is particularly suitable for use.
[0067] The output of the laser is normally selected according to
the use within the range of 1 to 1000 W.
[0068] If the diameter of the laser beam to be irradiated on the
dyed cloth is narrowed, then decolorization can be easily formed
with high precision. The diameter of the laser beam to be
irradiated on the dyed cloth is not particularly limited, but
specifically, the diameter is preferably no more than 2 mm, more
preferably no more than 1.5 mm, and even more preferably no more
than 1 mm when calculated as a 1/e.sup.2 value.
[0069] A decolorized product of a garment or a bag, etc. can be
obtained by performing the laser irradiation and then performing
washing, soaping, etc. as necessary.
[0070] In the present invention, the dyed cloth containing an
alkanolamine can be prevented from becoming fragile even in its
original state by retaining the dyed cloth in an appropriate pH
range, and then distributed as a dyed cloth to which a chemical
agent has been applied.
EXAMPLES
[0071] In the following, the present invention shall be explained
in detail using examples, but the scope of the present invention
should not be construed as limited to these examples.
Example 1
[0072] 17 parts by mass of anhydrous citric acid, 17 parts by mass
of sodium hydrogenphosphate, 25 parts by mass of sodium
dihydrogenphosphate, and 8 parts by mass of monoethanolamine
(content of 90%) was dissolved in 100 parts by mass of water to
prepare a denim cloth treatment liquid.
[0073] 99 parts by mass of water was added to 1 part by mass of the
denim cloth treatment liquid to prepare a denim cloth treatment
diluted solution.
[0074] A sulfur-dyed denim cloth was dipped in the denim cloth
treatment diluted solution for 5 minutes, and then the denim cloth
was lifted out from the solution and the moisture was wrung out
using a wringer. The denim cloth was subsequently air-dried by at
room temperature.
[0075] The dried denim cloth was cut and sewn to produce a pair of
jeans.
[0076] Using a laser irradiation device with an irradiation
temperature of approximately 1000.degree. C., the laser irradiation
port was brought to about 1500 mm from the cloth and the laser was
irradiated thereon while moving the laser at a speed of about 150
mm/sec. After irradiation, the jeans were washed, and thus a pair
of jeans which was subjected to the decolorization processing of
the present invention was produced.
Example 2
[0077] A pair of jeans which was subjected to the same
decolorization processing as Example 1 was produced, except that
the denim cloth treatment liquid was prepared by dissolving 3.5
parts by mass of anhydrous citric acid, 17 parts by mass of
sulfamic acid, 5 parts by mass of 85% phosphoric acid, 3 parts by
mass of sodium hydrogenphosphate, 7 parts by mass of sodium
dihydrogenphosphate, and 12 parts by mass of monoethanolamine
(content of 90%) in 52.5 parts by mass of water, and that an
indigo-dyed denim cloth was used.
Example 3
[0078] A pair of jeans which was subjected to the same
decolorization processing as Example 2 was produced, except that an
indigo-dyed denim cloth of a lighter color than the cloth of
Example 2 was used as the dyed cloth.
Comparative Example 1
[0079] A denim cloth identical to that of Example 1 was used,
except that the denim cloth was not treated with the denim cloth
treatment liquid, and a pair of jeans which was subjected to the
same decolorization processing as Example 1 was produced, except
that the above-mentioned denim cloth was used.
Comparative Example 2
[0080] A denim cloth identical to that of Example 2 was used,
except that the denim cloth was not treated with the denim cloth
treatment liquid, and a pair of jeans which was subjected to the
same decolorization processing as Example 2 was produced, except
that the above-mentioned denim cloth was used.
Comparative Example 3
[0081] A denim cloth identical to that of Example 3 was used,
except that the denim cloth was not treated with the denim cloth
treatment liquid, and a pair of jeans which was subjected to the
same decolorization processing as Example 3 was produced, except
that the above-mentioned denim cloth was used.
[0082] FIGS. 1(a) and 1(b) illustrate the pairs of jeans which were
subjected to decolorization processing as obtained in Example 1 and
Comparative Example 1. FIGS. 2(a) and 2(b) illustrate the pairs of
jeans which were subjected to decolorization processing as obtained
in Example 2 and Comparative Example 2. FIGS. 3(a) and 1(b)
illustrate the pairs of jeans which were subjected to
decolorization processing as obtained in Example 3 and Comparative
Example 3.
[0083] Upon comparing FIGS. 1(a) and 1(b), FIGS. 2(a) and 2(b), and
FIGS. 3(a) and 3(b), it can be seen that the decolorization in the
laser-irradiated portions is more vivid and the degree of whiteness
is higher in the pairs of jeans obtained in Examples 1, 2, and 3
shown in FIGS. 1(a), 2(a), and 3(a) compared to the pairs of jeans
obtained in Comparative Examples 1, 2, and 3 shown in FIGS. 1(b),
2(b), and 3(b).
INDUSTRIAL APPLICABILITY
[0084] The production method of the present invention is more
environmentally friendly, offers a better working environment, and
can more efficiently decolorize denim cloth compared to
conventional methods, and thus is applicable across the apparel
industry.
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