JPH064931B2 - Method for mercerizing roving yarn - Google Patents

Description

The present invention relates to a method for mercerizing roving yarn.

(Prior Art) Cotton and cotton-blended fibers are subjected to mercerizing (mercerizing) in order to impart gloss, improve dimensional stability, increase hygroscopicity and strength. Generally, mercerizing is carried out in the form of woven or knitted fabric, but there is a problem that the texture of articles is hardened due to the strong shrinking action of the cotton structure accompanying mercerizing, and bulkiness and flexibility are impaired. For this reason, there is a method of performing processing at the stairs of the yarn before knitting, but in the case of mercerizing the yarn, it is often carried out in a skein shape because of problems such as tension management, and there is a problem of productivity. As a solution to this problem, there is a proposal such as Japanese Patent Publication No. 57-47783, but the productivity has not been improved yet.

With these conventional techniques, it is difficult to develop a material having bulkiness and good dyeability and productivity, and mercerizing in the pre-spinning process has been desired. However, when the raw cotton is simply mercerized by using a high-concentration caustic soda solution, the raw cotton becomes a solid mass, making it difficult to break the cotton, and spinning becomes almost impossible. However, after the above treatment, a large amount of monofilament becomes waste cotton from the mixed-plying step to the passing of the combing step.

In order to solve such a problem, Japanese Patent Publication No. 62-27
Japanese Patent No. 188 discloses a method of continuous mercerizing in a sliver state.

(Problems to be Solved by the Invention) However, the method disclosed in Japanese Patent Publication No. 62-27188 is not suitable for small-quantity production because it has a facility problem and is a continuous method for mass production. There are problems.

In order to solve such a problem, the present invention discloses a Japanese Patent Publication No.
Focusing on the state of roving, which is the state following the sliver state targeted by No. 27188, the present invention provides a method for industrially advantageously performing alkali treatment in the state of cheese.

(Means for Solving the Problems) In the present invention, short fibers containing cellulosic fibers are made into roving through a spinning process, and the roving is wound at a winding density of 0.1 to 0.5 g / cm ³ to form cheese. After that, the cheese is set in a closed container, the pressure is reduced to 760 mmHg or less, and a high-concentration caustic soda solution is injected, and the cheese is heated to a temperature of 4
What is characterized by performing a treatment for fluidizing a high-concentration caustic soda solution at 0 to 60 ° C., followed by washing with water and neutralization, and short fibers containing cellulosic fibers are made into roving through a spinning process. After forming cheese by winding at a winding density of 0.1 to 05 g / m ³ , the cheese is set in a closed container, depressurized to 760 mmHg or less, and then high-pressure steam is injected, and then the temperature is 40 to 60 ° C. It is characterized in that it is subjected to a treatment for fluidizing the high concentration caustic soda solution, washed with water and neutralized.

The short fibers containing cellulosic fibers used in the present invention include cotton yarn which is a natural cellulose short fiber suitable for mercerizing, and synthetic fibers that can be mixed with cotton yarn, polyamide fibers (for example, nylon 6, nylon). 6.6),
It includes blended short fibers such as polyacrylonitrile fiber (eg polyethylene terephthalate), polyvinyl alcohol fiber (eg vinylon), polyolefin fiber (eg polyethylene), polyurethane fiber and the like. These short fibers are used in Kochi's spinning process, that is, blended cotton / cardboard /
It is made into a sliver through a process such as kneading, and is further wound into a roving form through a roving process.

In the present invention, the roving is not particularly limited as long as it can be wound on a bobbin or the like to form cheese, but usually 0.2
~ 0.5 g / m. Further, it is preferable that the roving is twisted about 0.5 to 2 times / inch as is generally done.

In the present invention, the mercerizing process is performed on the roving yarn state, but it is extremely difficult to perform the mercerizing process or the liquid flow treatment such as dyeing on the roving state. The reason is, as described in the above-mentioned prior art, a single fiber or a state in which the fibers are simply arranged in parallel, such as raw dyeing, carding, kneading sliver, or wool top dyeing, is subjected to liquid flow treatment. To do is relatively simple, as it has already been done. Further, it can be said that this is also easy for yarn dyeing because the yarn itself is completed in a form that is easy to handle. But,
Usually, the roving is wound around a plastic bobbin or a wood pipe, and cannot be used as it is for liquid flow treatment such as dyeing. Also, the strength and elongation are weak when it is rewound on the dyeing tube,
Since it takes time and effort, it is practically impossible.

In the present invention, the roving is wound on a bobbin which can be directly subjected to the liquid flow treatment, and the liquid flow treatment described below is performed to enable mercerizing in the state of the roving. Such a bobbin is made of metal, plastic, or wood pipe and has a number of small holes formed on its peripheral surface, as shown in FIG. Any material can be used as long as it can be placed and the processing liquid can be discharged through the small holes. Also, JP-A-62-21506
If the dyeing bobbin (FIG. 2) having the shape disclosed in Japanese Patent Publication No. 0 is designed and adjusted so that the roving can be wound up, each roving will adhere due to compression after lamination, and mercerizing will be effective. You can do it.

When winding the roving on the bobbin, the winding density is
It is necessary to softly wind it up to 0.1 to 0.5 g / cm ^3, and the compression bobbin as described above can also be used within this range. If the winding density is within the above range, the effect of the present invention can be obtained, but it is difficult to wind it into a cheese shape with a density of less than 0.15 g / cm ³ by a winder that is usually used, and 0.3 g / cm ³ c
If it exceeds m ³ , problems such as thread breakage occur, so 0.15 to 0.3
g / cm ³ is more preferable. Furthermore, if the winding density is 0.18 g / cm ³ or more, it is convenient because the shrinkage of the roving that accompanies mercerizing is small, and if it is 0.24 g / cm ³ or less,
Depending on the flow rate of the processing liquid, caustic soda penetrates uniformly,
Treatment spots are also extremely small.

The soft-rolled cheese thus prepared is set in a closed container such as a known cheese dyeing machine and depressurized to 760 mmHg or less, preferably 500 mmHg or less, and then by one of the following two methods, the caustic soda solution described below is used. Quickly and uniformly penetrate the roving. That is, the first method is a method of injecting a caustic soda solution immediately after decompression. The second method is a method of injecting high-pressure steam after depressurizing to steam set the roving, and then injecting a caustic soda solution. Second
In the case of the method, high pressure steam is 102 ° C or higher, 760 mmHg
The above is preferable, and heat setting is preferably performed for about 1 to 10 minutes.

The caustic soda solution used in both of these methods has a high concentration, that is,
The amount of caustic soda is about 18 to 30% by weight, and is appropriately selected from the range depending on the type of the object to be treated and the suitability of the treatment. The treatment temperature of the caustic soda solution can be selected in the range of 40 to 60 ° C, but if it is 40 ° C or lower, there is a problem in the uniformity of treatment, and if it is 60 ° C or higher, the tenacity of the roving is reduced and the spinnability is reduced. Problems occur.

Further, an anionic surfactant may be added to the caustic soda solution. The anionic surfactant can be selected from commercially available penetrants for mercerizing. As anionic surfactants, polyethylene glycol ether sulfate ester-based, olefins sulfate ester-based, amide-bound sulfate ester-based, ester-bound sulfate ester-based, ester-bound sulfonate-amide-bound sulfonate -Ether bond sulfonic acid salt system-Alkyl allyl sulfonate salt system-Ether bond alkyl sulfonate salt system-Ester bond alkyl allyl sulfonate salt system-Amid bond alkyl allyl sulfonate salt system etc. are mentioned. It is preferable to add one or two or more of these surfactants within the above concentration range, and it is particularly preferable to use a higher alcohol sulfate surfactant having a high penetrating power. The concentration is 0.1% to 1% (ow
It is selected according to the winding density of the object to be processed, etc. between about f).
Such an anionic surfactant has a function of sufficiently giving deaeration and penetration effects to cheese. Further, a solvent such as tetrachloroethylene may be appropriately added to the caustic soda container.

The treatment with the caustic soda solution is efficient when continuously performed in a closed container such as a cheese dyeing machine used for depressurization. When using the cheese dyeing machine, the bath ratio is 1: 5 to 1:10.
It is better to treat the solution in a degree, and a caustic soda solution may be prepared in the sub tank in advance. In this case, the treatment is performed for about 20 to 40 minutes while using the bobbin as described above to flow the solution through the small holes of the bobbin at a flow rate of about 5 to 30 / min · kg. The flow direction of the solution may be IN-OUT discharged from the bobbin to the roving yarn side or OUT-IN sucked from the roving yarn side to the bobbin side.
-OUT is preferable because uniform alkali treatment can be performed.

The object to be treated after such treatment is further sufficiently washed with hot water, washed with water, neutralized, treated with an oil agent, dehydrated and dried. The drying method is also not particularly limited, but a uniform dry state and a finish with a good texture can be obtained by using a high-frequency vacuum dryer that is preferably used in the cheese dyeing method.

The sikette-treated roving obtained in this way feels hard due to shrinkage during mercerizing, but since the work of the spinning machine further disentangles it by draft,
As a result, the flexibility of the yarn is restored, and it has a luster that is not present in ordinary spun yarn.

(Example) The test method which is the basis of the numerical values in the examples is as follows.

Cotton fiber swelling degree Observed by electron micrograph Barium activity number It is the value to measure the degree of mercerized, and it was calculated by the following formula based on the absorption degree of barium hydroxide in cotton fiber.

No = N / 1 for a barium hydroxide standard number of 10 cc
Droplet constant of 0HCl Nm = Drop constant of N / 10HCl in mother liquor 10cc when immersed in mercerized cotton Nu = Drop constant of N / 10HCl in mother liquor 10cc when immersed in untreated cotton Feeling Bending KES-FB Feeling measurement It was measured with a KES-FB2 pure bending tester of the system.

Feeling compression Measured with a KES-FB3 compression tester of a KES-FB texture measuring system.

Destructive strength JIS L-1096 A method (Mullen method) Uniformity of treatment and dyeing density Knitted fabric using alkali treated roving is Remazol
It was dyed with BLACK B 5% owf, and the dyeing density and the quality of the dyed surface were evaluated.

Example 1 0.4 g of roving yarn after roving was obtained by subjecting a raw cotton obtained by mixing cotton fiber and polyester fiber in a weight ratio of 3: 1 through a usual spinning process.
/ M, which is 0.2g / cm on the bobbin shown in Fig. 1.
^The cheese was rolled up at a winding density of ³ . Next, the cheese dyeing machine (LL
It was put in a C-50 / 60 type HISAKA MFG. CO., LTD. And the pressure was reduced to 500 mmHg using a vacuum pump. An aqueous solution having a caustic soda concentration of 21% and an anionic surfactant (Silpit P-25, manufactured by Yushisha Co., Ltd.) of 0.2% was prepared in a sub tank, and after the vacuum pump was stopped, it was injected. After the aqueous solution is completely injected, in the In-Out flow direction,
The flow rate was set to 10 / min · kg and the treatment was performed at 50 ° C for 30 minutes. After treatment, rinse with water for 20 minutes and rinse with hot water at 80 ° C
For 10 minutes, neutralization was carried out at 80 ° C. for 10 minutes, and softening treatment with a spinning oil was carried out at 40 ° C. for 10 minutes. The obtained alkali-treated roving was dehydrated, dried, set in a spinning machine, and then defibrated by a draft to obtain a spun yarn of No. 30. The spun yarn obtained was knitted on a 32-gauge double-sided circular knitting machine into an interlock structure and exposed by a commonly known method.
Dyeing, application of finishing agent, and dry finishing set were performed.

Example 2 The same cheese as in Example 1 was placed in a commonly known high-pressure cheese dyeing machine, and the pressure was reduced to 700 mmHg using a vacuum pump. After stopping the vacuum pump, high-pressure steam was introduced to perform steam setting. Caustic soda concentration 2 in the sub tank
An aqueous solution containing 1% and 0.2% of an anionic surfactant (Silpit P-25, manufactured by Yushisha Co., Ltd.) was prepared, and the vacuum pump was stopped and then injected. After the aqueous solution is completely injected, the flow rate is 10 / min · k in the In-Out flow direction.
It was set to g and treated at 50 ° C. for 30 minutes. After the treatment, washing with water was carried out for 20 minutes, washing with hot water at 80 ° C for 10 minutes, neutralization at 80 ° C for 10 minutes, and softening treatment with a spinning oil at 40 ° C for 10 minutes. The obtained alkali-treated roving was spun and knitted in the same manner as in Example 1, and subjected to bleaching, dyeing, application of a finishing agent, and dry finishing set in the same manner.

Comparative Example 1 The same roving as that used in Example 1 was used, and the same treatment was performed except that the alkali treatment was not performed.

Comparative Example 2 All were the same except that the same roving as that used in Example 1 was used, alkali treatment was not performed in the state of the roving, and mercerizing was added after bleaching in the state of the knitted fabric. Processed.

Comparative Example 3 The same roving as that used in Example 1 was used, and the same treatment as in Example 2 was carried out except that no alkali treatment was performed.

The results obtained in the above Examples and Comparative Examples are shown in Table 1.

As shown in Table 1, the examples are more advantageous in dyeing density and uneven dyeing than the comparative examples 1 and 3, and the comparative example 2 mercerized in the knitted fabric is hard in texture and poor in bulkiness. Is shown.

(Effects of the Invention) The present invention can industrially obtain a material having a very bulky texture and good dyeability by performing mercerizing treatment in the state of roving. The range of applications will be significantly expanded.

[Brief description of drawings]

1 and 2 are explanatory views of a bobbin suitable for use in carrying out the present invention.

Claims (2)

[Claims] 1. A short fiber containing a cellulosic fiber is made into a roving through a spinning process, and this is wound at a winding density of 0.1 to 0.5 g / cm ³ to form cheese, and the cheese is then hermetically sealed. Set inside, and after reducing the pressure to 760 mmHg or less,
A method for mercerizing roving yarn, which comprises injecting a high-concentration caustic soda solution, subjecting the cheese to a flow of the high-concentration caustic soda solution at a temperature of 40 to 60 ° C., then washing with water and neutralizing. 2. Short fibers containing cellulosic fibers are made into roving yarn through a spinning process, and this is wound at a winding density of 0.1 to 0.5 g / m ³ to form cheese, and the cheese is then hermetically sealed. Inside, and after decompressing to 760 mmHg or less, and then injecting high-pressure steam, a treatment for fluidizing a high-concentration caustic soda solution at a temperature of 40 to 60 ° C. is applied and washed with water,
A method for mercerizing roving yarn, characterized by neutralizing.