JPH09250072A - Indigo dyeing by knitting and deknitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate end breakage, to raise operation efficiency, to facilitate the control of a dye concentration, to promote the automatization of the control and to improve productivity in dyeing with indigo. SOLUTION: In this dyeing a cellulosic yarn with indigo, the cellulosic yarn is preknitted to give a knitted fabric F, which is dyed with a dyeing solution prepared by an indigo dye for a fixed time. Then the dyeing solution is removed from the fabric and oxidation with air is carried out. The dyeing and the oxidation with air are repeated until a fixed dye concentration is reached to complete a given dyeing. The fabric is taken out, deknitted and separated into single yarns.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for dyeing a cellulosic yarn with an indigo dye.

[0002]

2. Description of the Related Art Conventionally, there is so-called medium white dyeing which dyes the surface of the thread and leaves the core part white in dyeing a cellulosic thread with an indigo dye, which is roughly classified into the following dyeing methods. To be That is, one is the method by the ridges and the other is the method by the ropes.

[0003] Of these, the former makes cheese threads wound on a bobbin in a crepe, soaks this crepe in a dye liquor built with indigo dye for a certain period of time, takes it out, squeezes it, and oxidizes it in the air for a certain period of time. It is a method in which the steps of immersing in, squeezing, and oxidizing are repeated until the required concentration is reached, and after dyeing, the ridges are wound again into cheese, while the latter is loosely twisted on a rope that bundles many threads, According to the required number of tanks connected in series, boil in a boiling tank for about 18 seconds, rinse in a washing tank for about 15 seconds, then soak in the dyeing tank for about 50 seconds for dyeing, then take out and expose to air for about 2.5 minutes to oxidize The dyeing and oxidation steps are repeated 5 to 6 times over the above-mentioned fixed time, and finally, a washing tank is washed 2 to 3 times, 15 to 18 seconds each, and dried for about 10 minutes.

[0004]

However, the former method of forming a crepe requires a large amount of manpower and time for winding the crepe, and most of the middle white yarn obtained by this method is a yarn for jeans. However, the thread used for this is 10
There are many relatively thick yarns below the count, and this has the drawback that the seams increase and the efficiency of the loom during weaving is significantly impaired.
The latter method using a rope requires a considerably large space because of the equipment, and loosely twisted yarns must be separated by untwisting the yarns. If a break occurs, the broken thread will entangle with other threads,
There is a problem that the processing is very troublesome and troublesome.

The present invention has been proposed in order to solve the drawbacks of the conventional indigo dyeing as described above and to solve them. In particular, by adopting a knitting / deniting dyeing means, the yarn breakage is eliminated. The purpose is to improve the efficiency and facilitate the control of the dye concentration to facilitate the automation, thereby improving the productivity.

[0006]

Means for Solving the Problems That is, the feature of the present invention which meets the above object is in the dyeing of indigo of a cellulosic yarn, the dyeing in which the cellulosic yarn is knitted in advance into a knitted fabric and the knitted fabric is built with an indigo dye After immersing in the dyeing liquor in the tumbler type dyeing machine that contains the liquor and rotating it for a certain period of time to perform dyeing,
Next, the liquor is returned from the tumbler and the tumbler is rotated while the knitted fabric is housed in the tumbler to perform deliquoring and oxidation with air. Thereafter, the dye liquor is introduced into the tumbler for dyeing,
There is a dyeing method in which the above dyeing liquor is returned, deliquoring and oxidation by air are repeated until the required dye concentration is reached and the required dyeing is completed, and then the knitted fabric is taken out from the tumbler, unwound, and divided. .

Further, according to the present invention, a plurality of dyeing tanks containing a dyeing liquid are provided side by side in addition to the tumbler type dyeing machine, and knitted into a knitted fabric in advance, and the knitted fabric is first dyed. After soaking in the bath and dyeing for a predetermined time, pull up and squeeze with mangle, oxidize with air for a predetermined time, immerse in the second dyeing bath below, then squeeze with mangle, oxidize with air, It is also characterized in that the fabric is repeatedly immersed in the dyeing tank to dye the dye to a desired dye concentration, and then the knitted fabric is unwound and separated. In addition, the present invention is capable of controlling each step of dyeing, deliquoring, and oxidizing by automatic control in each of the above methods, and is another feature.

Further, it is preferable that the yarn obtained by unwinding the knitted fabric and separating the fibers is wound on cheese, and it is also effective to subject the dyed knitted fabric to a stone wash treatment before unwinding.

In the case of using a tumbler type dyeing machine, the tumbler rotation speed during dyeing is slow, about 5 to 20 rotations per minute, and the tumbler rotation speed during deliquoring and oxidation is 100 rpm.
It is preferable to obtain a rotation speed of the same effect as the diaphragm effect at about 200 rotations.

[0010]

When the above method is used, regardless of whether it is a tumbler dyeing machine or the dyeing tanks are arranged side by side, the cellulosic yarns, which are the fabric yarns, are knitted on the knitted fabric and dyed, so that the ropes or ropes are used. As described above, the yarns do not become entangled with each other, and therefore the yarns are hardly broken, and the indigo dyeing of the medium white can be performed uniformly, and the subsequent winding onto cheese is smooth and easy. Moreover, each process is easy to automatically control the repeating process until the required dye concentration is obtained, and the dyed knitted fabric can be subjected to stone wash processing as it is, so that an efficient and good indigo dyed yarn can be obtained. be able to. Further, according to the method of the present invention, it is possible to perform indigo dyeing on a yarn which is finer than the thickness of a conventional fabric yarn.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Specific embodiments of the present invention will be described below.

First, the dyeing method of the present invention is based on knitting a cellulosic yarn, which is a material yarn to be dyed, into a knitted fabric without forming a drape or rope.

The knitting is knitted in a tubular shape by using a known circular knitting machine, but when dyeing, it is in a flat state, and in the case of a tumbler type dyeing machine, it is accommodated in a net bag and put into the tumbler. On the other hand, when the dyeing tanks are arranged side by side, they are dipped into the dyeing tank in a flat state and squeezed with a mangle.

First, the case of using a tumbler type dyeing machine will be described below. The knitted fabric thus knitted is accommodated in a net bag and put into a tumbler. The tumbler has a dyeing solution built with indigo dye inside it, and the number of revolutions can be adjusted freely.The number of revolutions is too fast when the knitted fabric is put in and immersed to dye. Since it is difficult to obtain good dyeing, the dyeing is usually carried out at the slowest speed, usually at about 5 to 20 rpm, and dyeing for about 50 seconds. At this time, the temperature of the dye liquor is 20 to 5 in order to obtain a medium white color.
Around 0 ° C is good, and even if the temperature is too high, a medium white color cannot be obtained. After the dyeing for a predetermined time, the dyeing solution in the dyeing machine is once returned to the storage part, leaving the knitted fabric, increasing the rotation speed of the tumbler to remove the liquid by the principle of centrifugal dehydration, and at the same time, oxidizing it by contacting with air. Is done. At this time, the rotation speed of the tumbler may be the same as that of the squeezing effect, and is usually about 100 to 200 rotations per minute.

When the predetermined deliquoring and oxidation are performed in about 2.5 minutes, the dyeing solution is again introduced into the tumbler to dye the knitted fabric, and then the dyeing solution is treated in the same manner as described above. After returning, deliquoring, and oxidizing, after that, this is sequentially performed multiple times,
Usually, it is repeated 4 to 8 times and repeated until a predetermined dye concentration is reached.
In this way, when the dyed knitted fabric with the indigo dye having the predetermined dye concentration is obtained, the knitted fabric is pulled up and dried, and then the process is moved to the next step. The drying may be a known drying method. And
The dried knitted fabric is unwound as it is, separated into dyed yarn,
Although it may be rolled up into cheese with a winder, it is preferable to carry out a stone wash process performed on jeans or the like in a knitted state, and then unwind and separate the fibers and roll up into cheese.

Incidentally, an oiling step is appropriately added for winding.

Even when the tumbler type dyeing machine is used, it is natural to carry out the steps such as water washing and washing if there are necessary steps.

The above is the case where the tumbler type dyeing machine is used, but in the indigo dyeing method of the present invention, as in the conventional case, a plurality of dyeing tanks containing dyeing liquids made of indigo dye may be arranged in parallel. It can be carried out.

FIGS. 1 and 2 show the case where the dyeing tanks are arranged in parallel, and in the figures, 1 to 6 are dyeing tanks, 7 is a boiling tank,
8 is a washing tank, 9 and 10 are washing tanks, and 11 is a reducing solution tank. The knitted fabric F knitted with cellulosic yarn has a flat tubular shape and is introduced in the direction of the arrow, and is boiled and washed to reduce. The liquid enters the dyeing tank 1 introduced from the reducing solution tank 11, and after the first dyeing, the liquid is pulled up, squeezed by the mangle 12 and oxidized in the oxidizing section 13 by air, and then enters the next dyeing tank 2. . And after being dyed again in the dyeing tank, it is squeezed with the mangle 12
Oxidized. This is washed multiple times, six times in the figure, and finally dried and taken out.

In the above method, the processing time of boiling, washing with water, dyeing, oxidation, etc. is the same as before, but the oxidation is carried out by making the knitted fabric meander in the shape of a flat tube as shown in FIG. Air oxidize for about 2.5 minutes and soak in dyeing tank for about 50 seconds.

Since the temperature of the dye liquor is set to white, it is 2
It is about 0 to 50 ° C., and the number of dyeing tanks used is appropriately increased or decreased. Also in this method, the dried knitted fabric is subjected to a stone wash treatment if necessary, and the knitted fabric is unwound, separated, and wound into cheese.

As described above, the present invention is one in which dyeing is once performed as a knitted fabric, and since the process is repeated, automatic control is easy, and if the automatic control is performed, the check of the dye concentration can be automated. Due to the high efficiency of the knitting machine, the production amount can be greatly improved.

[0023]

As described above, the present invention is a knit / denit method in which a cellulosic yarn is once used as a knitted fabric to be dyed, and after dyeing, it is unwound and divided into fibers. There is no entanglement of each other's threads like rope, and because it is knitted in a knitted fabric, it has strength, and it is possible to dye medium white dyeing of thin threads compared to conventional thick count threads, and most Since there is no yarn breakage, it has a remarkable effect that work efficiency can be greatly improved.

Since the present invention is a knitted fabric as described above, the space required for dyeing is small. Especially, in the case of a tumbler dyeing machine, dyeing, deliquoring and oxidation are performed by the same machine. Therefore, it is expected that the apparatus will be greatly simplified and that dyeing yarns of various different appearances can be easily produced by performing the stone wash treatment on the knitted fabric.

[Brief description of drawings]

FIG. 1 is a schematic view of a dyeing tank juxtaposed device used for carrying out the method of the present invention.

FIG. 2 is a detailed enlarged view of the dyeing tank of FIG.

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] April 16, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction contents]

The knitted fabric knitted by the cellulosic fibers in this case is introduced in a flat cylindrical shape, boiled, through the washing reducing solution
Enters Gashirube input has been dyed tank, after the first staining is Risan reduction by the air is throttled by a mangle pulled upward, it enters the next dyeing bath. And after being stained again dyeing bath, squeezed between <br/> ring Le, they are oxidized. This is repeated multiple times
Are washed through the respective dyeing, retrieved are finally dried.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0020

[Correction method] Change

[Correction contents]

In the above method, the processing time for boiling, washing with water, dyeing, oxidation, etc. is the same as before, but for oxidation, the time required for the knitted fabric to meander in a flat tubular shape up and down, usually about 2.5.
Air oxidize for a minute and soak in the dyeing tank for about 50 seconds.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Deleted

[Procedure amendment 4]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Deleted

Claims (7)

[Claims] 1. In the indigo dyeing of a cellulosic yarn, the cellulosic yarn is knitted in advance on a knitted fabric, and the knitted fabric is dipped in a dyeing solution in a tumbler type dyeing machine containing a dyeing solution built with an indigo dye, and then fixed. After spinning and dyeing for a while,
Next, the liquor is returned from the tumbler and the tumbler is rotated while the knitted fabric is housed in the tumbler to perform deliquoring and oxidation with air. Thereafter, the dye liquor is introduced into the tumbler for dyeing,
After returning the dye liquor and deliquoring, oxidation by air is repeated until the required dye concentration is reached and the required dyeing is completed, the knitted fabric is taken out from the tumbler, and unraveled and divided. Indigo dyeing method using knit / denit. 2. The tumbler rotation at the time of dyeing is slow and is 5 to 2 per minute.
The indigo dyeing method by knit / denit according to claim 1, wherein the number of rotations is 0, the tumbler rotation during dewatering and oxidation is fast, and about 100 to 200 rotations. 3. The indigo dyeing method by knit / denit according to claim 1 or 2, wherein the steps of dyeing by introducing a dyeing liquor, and returning the dyeing liquor to deliquoring and oxidizing with air are automatically controlled. 4. The indigo dyeing method by knit / denit according to claim 1, 2 or 3, wherein after the dyeing is completed, the knitted fabric is taken out, subjected to stonewashing, unwound, separated and wound on cheese. 5. In the cellulosic indigo dyeing,
A plurality of dyeing tanks containing dye liquor built with indigo dye are arranged side by side, cellulosic yarn is knitted in advance on a knitted fabric, and the knitted fabric is dipped in the first dyeing tank and then pulled up and squeezed with a mangle. ,
Air oxidize and soak in the next second dyeing tank.
By knitting / deniting, which is characterized in that squeezing with a mangle, air oxidation and immersion in a dyeing tank are repeated until the required dye concentration is reached, and after the required dyeing is completed, the knitted fabric is unwound and divided. Indigo staining method. 6. The indigo dyeing method by knit / denit according to claim 5, wherein the steps of dyeing, squeezing and oxidizing are automatically controlled. 7. The indigo dyeing method by knit / denit according to claim 5 or 6, wherein after the dyed knitted fabric is subjected to a stonewash treatment, the knitted fabric is unwound, separated and wound on cheese with a winder.