KR20200107463A - Jeans denim efficient dyeing method - Google Patents

Abstract

The present invention relates to a method for efficiently dyeing jean denim. The method for efficiently dyeing jean denim comprises: a dyeing liquid preparing step; a dyeing step; an oxidizing step; a washing step; an acid treating step; a hydrogen peroxide treatment step; a soaping step; a fixing step; and a softening step. According to the present invention, denim can be easily dyed by using a general dyeing tool.

Description

Jeans denim efficient dyeing method

The present invention relates to a method for dyeing denim. In particular, the present invention relates to a denim dyeing method capable of dyeing denim indigo using conventional dyeing equipment, which was capable of dyeing denim indigo only when a special batch dyeing equipment is provided.

Ordinary denim is dyed 15 to 20 numbers of denim with special equipment that can implement repetitive oxidation and reduction processes.

Thus, they are dyed to make jeans or blue jackets.

Here, as the denim is strongly gripped and moved by the above-described special equipment, it must have sufficient tensile strength so that the thread does not break during repeated oxidation and reduction processes, so that it can be dyed in 15 to 20 as described above. It is limited in bold.

Currently, denim is limitedly used for small items such as jeans, jeans, and bags, but the texture is good and low-cost shirts, ties, and other clothing are combined to pursue a stylish and new trend. There is a drawback that cannot be met.

An object of the present invention created to solve the above problems is to provide a denim dyeing method capable of easily mass dyeing denim of high texture, such as 100 to 150 numbers, at a low cost using general dyeing equipment. Is in.

The present invention having the above configuration enables dyeing without special equipment in the case of indigo dyeing of denim. In particular, since the tensile strength of the denim is not a problem because a simple dyeing process (equipment) is used, high-density such as 100 to 150 It has the effect of dyeing denim in bulk.

Denim dyeing method according to the present invention, in the dyeing method comprising a dye solution preparation step, dyeing step, oxidation step, washing step, acid treatment step, fruit water treatment step, soaping step, fixing step and softening step, 1) in a container A fixing (CATION) step of fixing the denim at a temperature of 60°C for about 20 minutes by adding 2g/ℓ of a fixing agent; 2) washing step of washing the denim on which the fixing step has been performed; 3) Sodium hydroxide (NaOH) 50g/ℓ, dye 20-30g/ℓ, sodium hyposulfite 50g/ℓ, dispersant 1g/ℓ, leveling agent 1g/ℓ into a separate container controlled to maintain 40℃. Preparing the salt solution preparation step; 4) Dyeing step of immersing the denim washed in the washing step in the dye solution obtained in the dye solution preparation step, and maintaining it at 40 to 60°C for about 40 minutes to dye; 5) an oxidation step of separating the dyed denim from the dye solution and oxidizing the separated denim; 6) cold water washing step of performing cold water washing on the denim subjected to the oxidation step at room temperature of about 40°C for 10 minutes; 7) an oxidizing agent oxidation step of oxidizing the denim at a temperature of 45° C. for 20 minutes by adding 10 g/ℓ of an oxidizing agent and 1 g/ℓ of a penetrating agent to the washed denim through the cold water washing step; 8) an acid treatment step of acid treating the denim at a temperature of 45° C. for 20 minutes by adding 3 g/ℓ of glacial acetic acid (CH3COOH) to the oxidant-oxidized denim; 9) Fruit water treatment step of adding 3 g/L of fruit water (H2O2) and 1 g/L of fruit water stabilizer to the acid-treated denim to treat the denim at a temperature of 45° C. for 20 minutes; 10) Soaping step of soaping the denim at a temperature of 90° C. for 10 minutes by adding 1 g/L of a scouring agent, 1 g/L of a dispersant, and 1 g/L of a sequestering agent to the overwater treated denim; 11) a fixing step of adding 6% of a fixing agent to the soaped denim and treating it at a temperature of 30°C for 5 minutes and then raising the temperature to 60°C for about 15 minutes; And 12) a softening step of softening the denim at a temperature of 50° C. for about 30 minutes by adding 4 g/ℓ of a softener to the denim subjected to the fixing step.

As the fixing agent used in the fixing step of 1), Protefix CLR commercialized in Protex Korea, Korea, may be used. This fixing agent is used for fast fixing of dyes.

In particular, in the present invention, before performing the fixing step of 1), 1 g/L of a penetrant and 1 g/L of a water softener are added to the container to refine the denim at a temperature of 90°C for about 20 minutes (refining step); further Can be done.

The washing step of 2) consists of washing the denim in which the fixing step of 1) is performed in flowing water at 35 to 45° C. for about 4 to 6 minutes. In particular, the present invention is characterized in that the water washing in the washing step is performed only once.

This allows the above-described fixing agent to be uniformly fixed to the fibers, and also allows a strong fixation before washing to a weak fixation after washing with water.

In the salt solution preparation step of 3) above, in a separate container controlled at a temperature of 40°C, sodium hydroxide (NaOH) 50g/ℓ, dye 20 to 30g/ℓ, sodium hyposulfite (Na2S2O4) 50g/ℓ, dispersant 1g It consists of preparing a salt solution by adding /ℓ, leveling agent 1g/ℓ. As the dispersant in the above, a known dispersant such as Snopol WS-P of Daeyoung Chemical in Korea may be used. In addition, as the leveling agent in the above, a known leveling agent such as LS-30 (LS-30) of Daewon Industries, Korea may be used.

In particular, in the preparation of the salt solution, it is preferable to first add sodium hydroxide and then add the dye after 5 minutes, and then add the sodium hyposulfite, dispersant, and leveling agent sequentially after 10 minutes after pumping. This sequential injection allows sufficient dilution of the preparations (sodium hyposulfite, dispersants and leveling agents) and dyes, and is to prevent unnecessary troubles between preparations and between preparations and dyes. Here, the meaning of collision is specifically used to mean preventing an increase in temperature of the salt solution by minimizing the heat generated by the reaction between sodium hyposulfite and sodium hydroxide.

The dyeing step of 4) consists of immersing the denim washed in the water washing step in the dye solution obtained in the dye solution preparation step, and maintaining the dye at 40 to 60°C for about 40 minutes.

The oxidation step of 5) comprises separating the denim that has undergone the dyeing step from the dye solution and oxidizing the separated denim. Oxidation here oxidizes a dye or the like in a dye solution dyed on denim, which can naturally be understood by those skilled in the art. In particular, in the present invention, the oxidation step of 5) is performed by discharging the salt solution filled in the container to a service tank and then leaving it in the air for 10 minutes to naturally oxidize the denim.

In particular, the natural oxidation as described above is performed in order to sufficiently express the unique color of dyes such as indigo and the recycling of dyes in the dyeing machine.

The cold water washing step of 6) consists of performing cold water washing for 10 minutes at room temperature of about 40°C on the denim that has undergone the oxidation step.

The oxidizing agent oxidizing step of 7) comprises oxidizing the denim at a temperature of 45°C for about 20 minutes by adding 10 g/L of an oxidizing agent and 1 g/L of a penetrating agent to the denim washed through the cold water washing step. In the above, as the oxidizing agent, a known commercially available oxidizing agent such as Rudigol (LUDIGOL; oxidizing agent for VAT dye) of BASF, a German national company, may be used. In addition, the penetrant may also be a known commercial penetrant such as Samyoung Petrochemical's NEWPAN-TLS located in Korea.

In the acid treatment step of 8), 3 g/L of glacial acetic acid (CH3COOH) is added to the oxidant-oxidized denim, and the denim is acid-treated at a temperature of 45°C for about 20 minutes.

The fruit water treatment step of 9) consists of adding 3 g/L of fruit water (H2O2) and 1 g/L of fruit water stabilizer to the acid-treated denim, and treating the denim with fruit water at a temperature of 45° C. for 20 minutes. As the fruit tree stabilizer, a known commercially available fruit tree stabilizer such as AS-500 (AS-500) of Asung Corporation in Korea may be used.

The soaping step of 10) is performed by adding 1 g/L of scouring agent, 1 g/L of dispersant, and 1 g/L of sequestering agent to the overwater-treated denim, and soaping the denim at 90°C for about 10 minutes. As the refining agent, a known commercialized refining agent such as UNICLEAN 750 of Daehyun Industry in Korea may be used. In addition, as the metal ion sequestering agent, a known commercially available metal ion sequestering agent such as NEWNON-K of Samyoung Petrochemical in Korea may be used.

In the fixing step of 11), 6% of a fixing agent was added to the soaped denim and treated at a temperature of 30℃ for about 5 minutes.

It consists of raising the temperature to 60°C and re-treating for about 15 minutes. As the fixing agent used in this step, a known commercially available fixing agent such as LAVAFIX FF of German national company Dystar may be used, and as a fixing agent used after dyeing, it functions to improve friction fastness.

In addition, the softening step of 12) comprises softening the denim at a temperature of 50° C. for about 30 minutes by adding 4 g/ℓ of a softener to the denim that has undergone the fixing step. As the softening agent, a known commercial softener such as Soft-1000 (SOFT-1000) of Shinsung Emulsion in Korea may be used.

After performing the softening step of 12), a post-treatment step of dewatering and drying the dyed denim may be further performed, as can be understood by those skilled in the art.

Hereinafter, the configuration of the present invention will be described in detail with reference to examples.

Here, it should be noted in advance that the container used in the following Examples and Comparative Examples is [Sadem 30kg Tang].

Example

This embodiment is an optimal embodiment of the present invention, and solves the problem to be solved of the present invention, and other Comparative Examples 1 to 5 below are examples that are not preferable and easily solve the problem of the present invention.

1) Denim pretreatment-refining

1g/ℓ of a penetrating agent and 1g/ℓ of a hard water softener are added to the container, and the denim is refined at 90℃ for about 20 minutes.

2) Sticking (CATION)

2g/ℓ of the fixing agent is added to the container and the denim is fixed at 60℃ for about 20 minutes.

Here, the denim is fixed and washed once with water.

3) Preparation of salt solution

First, in a container, put 50g/ℓ of sodium hydroxide (NaOH), 25g/ℓ of dye, 50g/ℓ of sodium hyposulfite, 1g/ℓ of dispersant, and 1g/ℓ of leveling agent.

To prepare a salt solution.

Here, the filled salt solution of the container is maintained at 40° C. in the dye preparation preparation process.

In addition, for the salt solution, sodium hydroxide was first added, dye was added after 5 minutes, and after 10 minutes after pumping, hyposulfite

Ttrium, dispersant, and leveling agent are sequentially added to prepare a salt solution.

4) Primary dyeing

Denim is immersed in a dye solution and dyed by holding at the aforementioned temperature, for example, 40 to 60° C. for about 40 minutes.

5) natural oxidation

The dye solution filled in the container is drained to the service tank and left for 10 minutes to naturally oxidize the denim.

6) Cold water washing

The naturally oxidized denim is washed with cold water for 10 minutes at room temperature of about 40℃.

7) oxidation

10g/ℓ of oxidizing agent and 1g/ℓ of penetrating agent are added to oxidize the denim at 45℃ for about 20 minutes.

8) acid treatment

Add glacial acetic acid (CH3COOH) 3g/ℓ and acid-treat the denim at 45℃ for about 20 minutes.

9) Fruit water treatment

Fruit water (H2O2) 3g/ℓ and fruit water stabilizer 1g/ℓ are added to treat the denim at 45℃ for 20 minutes.

10) Soaping

1g/L of scouring agent, 1g/L of dispersant and 1g/L of sequestering agent are added to soap the denim at 90°C for about 10 minutes.

11) Sticking

After 6% of the fixing agent is added and treated at the initial temperature of 30°C for 5 minutes, the temperature is raised to 60°C and the treatment is performed again for about 15 minutes.

12) flexible

Softening agent 4g/ℓ is added to soften the denim at 50℃ for about 30 minutes.

Finally, when the denim is dehydrated and dried, the finished indigo dyed denim is obtained.

Comparative Example 1

1) Preparation of salt solution

First, 30 g/l of dye, 100 g/l of sodium hydroxide (NaOH), 100 g/l of sodium hyposulfite, 1 g/l of dispersant, and 2 g/l of leveling agent are added to a container to prepare a salt solution.

Here, the filled salt solution of the container is maintained at 40° C. in the dye preparation preparation process.

In addition, the dye solution is prepared by adding the dye first, sodium hydroxide is added after 5 minutes, and sodium hyposulfite, dispersant and leveling agent are sequentially added after 5 minutes.

2) primary dyeing

Denim is immersed in a dye solution and dyed by holding at the aforementioned temperature, for example, 40° C. for about 20 minutes.

3) natural oxidation

The dye solution filled in the container is drained to the service tank and left for 10 minutes to naturally oxidize the denim.

4) secondary dyeing

The dye that has been drained into the service tank is again filled into the container, and the dye is dyed by immersing the denim in the dye for about 20 minutes while maintaining the temperature of the dye solution at 40°C.

Here, in the secondary dyeing process, 10 g/ℓ of NaOH and 10 g/ℓ of sodium hyposulfite are added to the salt solution.

5) 1st cold water washing

The secondary dyed denim is washed with cold water for 10 minutes at room temperature of about 30°C.

6) oxidation

10g/ℓ of oxidizing agent is added to oxidize the denim at 40℃ for about 10 minutes.

7) Soaping

2g/ℓ of scouring agent is added and the denim is soaped at 60℃ for about 10 minutes.

8) 2nd cold water washing

The soaped denim is washed with cold water for 10 minutes at room temperature of about 30°C.

9) flexible

5g/ℓ of a softener is added to soften the denim at 50℃ for about 30 minutes.

Finally, when the denim is dehydrated and dried, the finished indigo dyed denim is obtained.

Comparative Example 2

1) Preparation of salt solution

First, 15 g/l of dye, 100 g/l of sodium hydroxide (NaOH), 100 g/l of sodium hyposulfite, 1 g/l of dispersant, and 2 g/l of leveling agent are added to a container to prepare a salt solution.

Here, the filled salt solution of the container is maintained at 40° C. in the dye preparation preparation process.

In addition, the dye solution is prepared by adding the dye first, sodium hydroxide is added after 5 minutes, and sodium hyposulfite, dispersant and leveling agent are sequentially added after 5 minutes.

2) primary dyeing

Denim is immersed in a dye solution and dyed by holding at the aforementioned temperature, for example, 40° C. for about 20 minutes. Here, after wrapping the fabric (denim) around the provided central shaft of the container, the dyeing process is started.

3) oxidation

Add 5g/ℓ of oxidizing agent to oxidize the denim at 43℃ for 10 minutes.

4) secondary dyeing

After re-preparing the dye solution, the denim is re-introduced and immersed at 40°C for 20 minutes to perform secondary dyeing.

Here, the denim is lifted from the container to the top of the container by a means such as a hoist, and then re-prepared the dye solution in the container, and then immersed in the dye solution using a hoist and dyed.

The salt solution is prepared by adding 20 g/L of dye, 100 g/L of sodium hydroxide (NaOH), 100 g/L of sodium hyposulfite, 1 g/L of dispersant, and 2 g/L of leveling agent to the container.

In addition, in the same manner as in the initial preparation of the salt solution, a dye solution is first added, sodium hydroxide is added after 5 minutes, and sodium hyposulfite, a dispersant, and a leveling agent are sequentially added after 5 minutes to prepare a salt solution.

5) oxidation

10g/ℓ of oxidizing agent and 15g/ℓ of penetrating agent are added to oxidize the denim at a temperature of 60℃ for about 10 minutes.

6) Fruit water treatment

Fruit water (H2O2) 1g/ℓ and fruit water stabilizer 05g/ℓ are added to treat denim at 60℃ for about 10 minutes.

7) acid treatment

Add glacial acetic acid (CH3COOH) 3g/ℓ and acid-treat the denim at 60℃ for about 15 minutes.

8) Hot water tax

The acid-treated denim is washed with hot water at about 40℃ for 10 minutes.

9) Soaping

1g/ℓ of scouring agent and 15g/ℓ of penetrating agent are added and the denim is soaped at 70℃ for about 20 minutes.

10) flexible

5g/ℓ of a softener is added to soften the denim at 50℃ for about 30 minutes.

Finally, when the denim is dehydrated and dried, the finished indigo dyed denim is obtained.

Comparative Example 3

1) Denim pretreatment-refining

1g/ℓ of a penetrating agent and 1g/ℓ of a hard water softener are added to the container, and the denim is refined at 90℃ for about 20 minutes.

Thereafter, 1 g/ℓ of a penetrating agent and 1 g/ℓ of a hard water softener were added to the container, and the denim was secondarily refined at 90° C. for 10 minutes to prepare.

Here, after the primary refining, the gap between the central bars is filled with a raw surface, and then secondary refining is performed.

2) Preparation of salt solution

First, 30 g/l of dye, 100 g/l of sodium hydroxide (NaOH), 100 g/l of sodium hyposulfite, 1 g/l of dispersant, and 2 g/l of leveling agent are added to a container to prepare a salt solution.

Here, the filled salt solution of the container is maintained at 40° C. in the dye preparation preparation process.

In addition, the dye solution is prepared by adding the dye first, sodium hydroxide is added after 5 minutes, and sodium hyposulfite, dispersant and leveling agent are sequentially added after 5 minutes.

3) primary dyeing

Denim is immersed in a dye solution and dyed by holding at the aforementioned temperature, for example, 40° C. for about 20 minutes.

4) natural oxidation

The dye solution filled in the container is drained to a service tank and left for 10 minutes to naturally oxidize the denim.

5) secondary dyeing

The dye that has been drained into the service tank is again filled into the container, and the dye is dyed by immersing the denim in the dye for about 20 minutes while maintaining the temperature of the dye solution at 40°C.

6) Cold water washing

The secondary dyed denim is washed with cold water for 10 minutes at room temperature of about 40°C.

7) oxidation

10g/ℓ of oxidizing agent and 1g/ℓ of penetrating agent are added to oxidize the denim at 45℃ for about 20 minutes.

8) acid treatment

Add glacial acetic acid (CH3COOH) 3g/ℓ and acid-treat the denim at 45℃ for about 20 minutes.

9) Fruit water treatment

Fruit water (H2O2) 3g/ℓ and fruit water stabilizer 05g/ℓ are added to treat the denim at 45℃ for 20 minutes.

10) Soaping

Add 1g/ℓ of scouring agent and soap the denim at 70℃ for about 20 minutes.

11) Sticking

After 3% of the fixing agent is added and treated at 30°C for 5 minutes, the temperature is raised to 60°C and reprocessed for 15 minutes.

12) flexible

Softening agent 6g/ℓ is added to soften the denim at 50℃ for about 30 minutes.

Finally, when the denim is dehydrated and dried, the finished indigo dyed denim is obtained.

Comparative Example 4

1) Denim pretreatment-refining

1g/ℓ of a penetrating agent and 1g/ℓ of a hard water softener are added to the container, and the denim is refined at 90℃ for about 20 minutes.

Thereafter, 1 g/ℓ of a penetrating agent and 1 g/ℓ of a hard water softener were added to the container, and the denim was secondarily refined at 90° C. for 10 minutes to prepare.

Here, after the primary refining, the gap between the central bars is filled with a raw surface, and then secondary refining is performed.

2) Preparation of salt solution

First, sodium hydroxide (NaOH) 70g/l, sodium hyposulfite 70g/l, dye 30g/l, dispersant 1g/l, and leveling agent 1g/l are added to a container to prepare a salt solution.

Here, the filled salt solution of the container is maintained at 40° C. in the dye preparation preparation process.

In addition, sodium hydroxide is first added to the salt solution, sodium hyposulfite is added after 5 minutes, and then, dye, dispersant, and leveling agent are sequentially added after 5 minutes to prepare a salt solution.

In particular, it is preferable to separately dissolve and then add the dye.

3) primary dyeing

Denim is immersed in a dye solution and dyed by holding at the aforementioned temperature, for example, 40° C. for about 20 minutes.

4) natural oxidation

The dye solution filled in the container is drained to the service tank and left for 10 minutes to naturally oxidize the denim.

5) secondary dyeing

The dye that has been drained into the service tank is again filled into the container, and the dye is dyed by immersing the denim in the dye for about 20 minutes while maintaining the temperature of the dye solution at 40°C.

6) Cold water washing

The secondary dyed denim is washed with cold water for 10 minutes at room temperature of about 40°C.

7) oxidation

10g/ℓ of oxidizing agent and 1g/ℓ of penetrating agent are added to oxidize the denim at 45℃ for about 20 minutes.

8) acid treatment

Add glacial acetic acid (CH3COOH) 3g/ℓ and acid-treat the denim at 45℃ for about 20 minutes.

9) Fruit water treatment

Fruit water (H2O2) 3g/ℓ and fruit water stabilizer 1g/ℓ are added to treat the denim at 45℃ for 20 minutes.

10) Soaping

1g/L of a scouring agent is added to soap the denim for about 20 minutes at 80°C, and 1g/L of a dispersant is added to the denim for about 20 minutes at 80°C.

11) Sticking

After 6% of the fixing agent is added and treated at the initial temperature of 30°C for 5 minutes, the temperature is raised to 60°C and the treatment is performed again for about 15 minutes.

12) flexible

Softening agent 6g/ℓ is added to soften the denim at 50℃ for about 30 minutes.

Finally, when the denim is dehydrated and dried, the finished indigo dyed denim is obtained.

As a result of visually examining the dyeing state of the denims dyed according to the above-described Examples and Comparative Examples, it was found that the examples were uniformly dyed at a uniform concentration, and the washing fastness was tested according to KSKISO105-C04, It was judged as 4th grade, and it was confirmed that it showed excellent washing fastness.

On the other hand, the comparative examples have problems such as non-uniform dyeing, lowering of washing fastness, or inability to operate the dyeing machine.

The present invention described above has been described by being limited to the above-described embodiments, but the present invention is not limited thereto, and modifications to the extent that a person of ordinary skill in the art can easily implement the present invention It is obvious that it belongs to the technical idea of

Claims (6)

In the dyeing method comprising a dye solution preparation step, dyeing step, oxidation step, water washing step, acid treatment step, fruit water treatment step, soaping step, fixing step and softening step,
1) A fixing (CATION) step of fixing the denim at a temperature of 60°C for about 20 minutes by adding 2g/ℓ of a fixing agent to the container;
2) washing step of washing the denim on which the fixing step has been performed;
3) Sodium hydroxide (NaOH) 50g/ℓ, dye 20-30g/ℓ, sodium hyposulfite 50g/ℓ, dispersant 1g/ℓ, leveling agent 1g/ℓ into a separate container controlled to maintain 40℃ Preparing the salt solution preparation step;
4) Dyeing step of immersing the denim washed in the water washing step in the dye solution obtained in the dye solution preparation step, and maintaining it at 40 to 60°C for about 40 minutes to dye:
5) an oxidation step of separating the dyed denim from the dye solution and oxidizing the separated denim;
6) cold water washing step of performing cold water washing on the denim subjected to the oxidation step at room temperature of about 40°C for 10 minutes;
7) an oxidizing agent oxidation step of oxidizing the denim at a temperature of 45° C. for 20 minutes by adding 10 g/ℓ of an oxidizing agent and 1 g/ℓ of a penetrating agent to the washed denim through the cold water washing step;
8) an acid treatment step of acid treating the denim at a temperature of 45° C. for 20 minutes by adding 3 g/ℓ of glacial acetic acid (CH3COOH) to the oxidant-oxidized denim;
9) Fruit water treatment step of adding 3 g/L of fruit water (H2O2) and 1 g/L of fruit water stabilizer to the acid-treated denim to treat the denim at a temperature of 45° C. for 20 minutes;
10) Soaping step of soaping the denim at a temperature of 90° C. for about 10 minutes by adding 1 g/L of a scouring agent, 1 g/L of a dispersant, and 1 g/L of a sequestering agent to the overwater treated denim;
11) a fixing step of adding 6% of a fixing agent to the soaped denim and treating it at a temperature of 30°C for 5 minutes and then raising the temperature to 60°C for about 15 minutes; And
12) a softening step of softening the denim at a temperature of 50° C. for about 30 minutes by adding 4 g/ℓ of a softener to the denim subjected to the fixing step;
Denim dyeing method, characterized in that made, including. The method of claim 1,
A denim pre-treatment step (refining step) of refining denim at 90°C for about 20 minutes by adding 1 g/L of a penetrant and 1 g/L of a hard water softener to the container before performing the fixing step of 1) is further performed. How to dye denim. The method of claim 1,
Denim dyeing method, characterized in that the water washing in the washing step of 2) is performed only once. The method of claim 1,
In the salt solution preparation step of 3), the salt solution consists of sequentially adding sodium hyposulfite, a dispersant, and a leveling agent after 5 minutes of sodium hydroxide and then 5 minutes, then a dye, and a pump, and 10 minutes after the delivery. Dyeing method. The method of claim 1,
The method of dyeing denim, characterized in that the oxidation step of 5) is carried out by discharging the salt solution filled in the container to a service tank and then leaving it in the air for 10 minutes to naturally oxidize the denim. The method of claim 1,
Denim dyeing method, characterized in that further performing a post-treatment step of dehydrating and drying the dyed denim after performing the softening step of 12).