JPS5982460A - Mercerizing process of knitted fabric - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION This introduction 1 relates to a method for mercerizing a knitted fabric.

It is already known to mercerize cellulose fibers. The mercerization process involves keeping the cellulose fibers in a taut state while impregnating them with a concentrated aqueous solution of caustic alkali to keep them in a wet state, then washing them with moisture, and neutralizing them with 6'f'. This is followed by rinsing with water.

In principle, mercerization is a play on cellulose! 1% originally had the crystal structure of cellulose I, but cellulose tlj & lIi was brought into contact with a caustic alkali aqueous solution to cause a chemical reaction, resulting in alkali cellulose l and alkali cellulose ■ and Th raw U, and then washed with water. explains that it involves removing the caustic alkali and changing it to cellulose H, which is the crystalline structure of hydrated cellulose. For this reason, the cellulose after mercerization has excellent gloss, dyeability, morphological stability, strength, etc., and is of excellent quality as a fiber.

As mentioned above, the mercerization process involves impregnating cellulose fibers with an aqueous solution of caustic alkali and causing a chemical reaction to change the crystal structure to y (1j, so the actual operation is performed using an aqueous solution of caustic alkali). During the mercerizing process, the caustic alkaline solution was sometimes collected by a mangle, etc., but in the mercerizing process, the delicate material was always A wet state K+Ii containing moisture of -% or more was maintained.

On the other hand, mercerization processing is performed using cellulose (4M NF
It was usually carried out in the state of silk, but it was also carried out in the state of sieved material or silk. It is also known to once mercerize the yarn, then weave or thin the yarn into a fabric or silk fabric, and then mercerize the yarn. In any case, as mentioned above, the mercerization process involves causing a change in the crystal structure through a chemical reaction, so it requires the presence of a large amount of moisture, and therefore the fibers are purposefully kept in a dry state. There was no mercerization process.

In the mercerization process, the fibers are made into a tensile, irradiated, t,! IP
Since it is required that the cellulose Fib string has a strength of
After that, if you want to mercerize it again,
Stretch the distribution and knitted fabric vertically and horizontally to create tension! It was necessary to hold. In the case of woven fabric, it is possible to clip the edges on both sides and pull it horizontally and vertically to maintain tension, but in the case of silk, the fine #A weave will become distorted if it is pulled too hard. , is difficult to maintain at 1 in tension. In addition, when silk fabric is mercerized by pinning both edges with pins, the stitches on both edges become dense, causing unevenness in the width direction and making it impossible to make the entire fabric uniform. For this reason, conventionally, even if the knitted fabric was mercerized in the right shape, coarse and dense coarseness occurred, and it was still not possible to improve gloss, strength, dyeability, etc. as with woven fabrics.

This inventor proposed that when mercerizing a knitted fabric, the fabric is not kept under tension in a caustic aqueous solution, but is impregnated with a caustic alkaline aqueous solution so that it can be contracted, and then pulled out of the caustic alkaline aqueous solution. While keeping it as dry as possible and with little moisture, hang the silk in a tenter in the lengthwise direction and 1llli! We attempted to mercerize the material by pulling it in the same direction and holding it in tension for a while. In other words, we attempted to dry mercerize the knitted fabric. As a result, it was found that by doing this, the silk fabric could be pulled strongly in the width direction without changing the shape of the fine grains, and the mercerization process could be uniformly performed in the qv direction as well. This invention was made based on such knowledge.

In this invention, a thread containing cellulose fibers is mixed with alkali, and subjected to a tension downward tilting Mercera 4 process in a wet state.
This yarn is then knitted into a silk fabric, and then a caustic alkaline aqueous solution is applied to the knitted fabric to allow the silk fabric to contract freely.
The knitted fabric is pulled up from the caustic alkali aqueous solution, the knitted fabric is continuously pulled in the length direction and l (, The present invention relates to a method for mercerizing knitted fabrics.

This invention method is a method in which mercerization is performed twice, once in the state of yarn and once in the state of silk fabric. Of these, the mercerization process performed on thread-like fibers is no different from the mercerization process that is normally performed. In that case, the thread is kept under tension, and in this state, a caustic alkaline aqueous solution is mixed with the thread to make sure that it contains all the moisture. Treated with S
Complete Jl.

However, in dry mercerization processing, silk fabric is immersed in an aqueous caustic solution without tension. '1' The KA4 fabric was sufficiently shrunk by absorbing an alkaline aqueous solution, and then dried to remove the moisture contained in it, and only then the edges of the silk fabric were fixed and stretched vertically and horizontally. to hold. In this respect, dry mercerization differs from conventional mercerization.

The knitting may be tubular or open. In the case of a tubular shape, it may be cut lengthwise to form an open shape, and then subjected to dry mercerization processing.

In the dry mercerizing process, the silk fabric can be freely collected and shaped.1. In each step, the knitted fabric is impregnated with a caustic aqueous solution, and then the knitted fabric is pulled up from the caustic aqueous solution.

When the silk fabric is lifted from the aqueous caustic solution, the knitted fabric contains more than twice its dry weight of the aqueous caustic solution. Even if it is squeezed normally, the silk fabric absorbs at least approximately the same weight of the caustic aqueous solution. Even if you squeeze it sufficiently using a machine such as a mangle,
It is impossible to reduce the amount of caustic aqueous solution to less than about 40% by weight of the dry weight of the knitted fabric. Therefore, Jin 1111
Mercerization of at least 10% by weight
It will be done in a state that contains moisture. However, in the dry mercerizing process, the knitted fabric is further dried and the moisture content is reduced, and the knitted fabric is maintained under tension in the length direction and the yoke direction only when the moisture content is reduced.

In this respect, dry mercerized Eva differs from ordinary mercerized processing.

In this invented method, after the knitted fabric is pulled up from an alkaline aqueous solution, it is patterned with a mangle, and then exposed to air for timing to perform so-called nearing.
Drizzle a sufficient amount of alkaline liquor onto the ground. During this time,
The silk fabric should be in a state where it can contract freely without being placed under tension.

After applying a sufficient amount of alkaline aqueous solution to the silk fabric and sufficiently shrinking the silk fabric, while reducing the water content by drying, the amount of caustic alkaline water 'kr solution becomes 50% by weight or less of the amount of Sukiji rolled ffi. I will do it up to Among these, preferred is 70% by weight or less, more preferably 70% by weight or less. Tension the silk fabric in the length and width directions. For this reason, it is best to pull the silk fabric in both directions as described in 1H. To do this, it is appropriate to hang the silk fabric on a tenter, fix both sides of the silk fabric with bottles, etc., and then pull it. When a knitted fabric is stretched in the air, especially when the moisture content is low, with a bottle at IM, the stitches are not deformed, the seams can be pulled strongly enough, and the unevenness of the stitches is minimized in the width direction. can do.

Therefore, high-quality treated products can be obtained by processing in the same way as textiles.

After stretching the silk fabric in the longitudinal and width directions in a low-moisture state, the caustic alkali is removed in exactly the same manner as the conventional post-mercerization process. That is, it is washed with warm water, neutralized with acid, and then washed with water to remove the caustic alkali.

The yarn used in this invention is limited to one consisting only of cellulose fibers, but may also be a yarn made by blending Cellulose Rei 1" with other fibers, such as polyester fiber 84. Cellulose 4.QH@lt is usually made of cotton, but may also be recycled fibers such as stable fiber or cupro. It may be something that has been done.

The caustic aqueous solution used in the method of this invention is the same as the conventional one. However, compared to the aqueous caustic alkaline solution used in the form of yarn, the aqueous caustic alkaline solution used in the form of silk fabric may have a concentration as low as λ.

Specifically, the caustic alkali aqueous solution in the form of thread has a caustic alkali concentration of 7.2 to 30% by weight.
And, Of can be said in Baume as koθ or 3. sLi
It is appropriate that it is Baume, but the caustic alkali aqueous solution in the state of silk fabric has a concentration of caustic alkali of 2 or...? j heavy cloth% binding, therefore, in terms of Baume, /j to 3θ degrees Baume is appropriate. As the caustic alkali, both caustic soda and caustic potash can be used, but caustic soda is preferably used.

The conditions for dry mercerizing, which is performed later on as a knitted fabric, are generally weaker than the conditions for ordinary mercerizing, which is performed on yarn. However, as in normal mercerization processing, a surfactant may be added to aid in soaking the solution. In addition, auxiliary agents for each building can be added as needed.

Mercerizing the thread can be done by simply pulling the thread taut rather than pulling it.

Even if it is pulled, up to 20% is sufficient. In dry mercerization processing of a knitted fabric, the knitted fabric is tensed and pulled in the width direction and length direction while maintaining a low moisture state.

The tension is /θ or 30% in the length direction and 2 in the width direction.
A suitable range is 0 to 60%.

According to the method of the present invention, since the mercerization process is performed on the core of the yarn, the gloss, the stability and strength of the yarn are already improved in the yarn state. Since such yarns are roughened to form a knitted fabric, the fabric has good gloss, and has excellent shape stability and strength. Since such a knitted fabric is further mercerized, the knitted fabric has an even higher gloss, a stable shape, excellent strength, and good dyeability.

Moreover, since the knitted fabric is in a state where it can freely contract when absorbing the caustic alkali aqueous solution, the yarns absorb the caustic alkali and swell without the mutual spacing being fixed. Next, the knitted fabric is pulled in the length direction and the width direction while keeping it in a low moisture state. Therefore, according to the method of this invention, it is possible to obtain a high-quality knitted fabric with good gloss, excellent shape stability, high strength, and good dyeability.This invention The method provides such advantages.

Next, the method of the present invention will be explained in more detail with reference to Examples.

Example Δ After burning the thread of 0/2 s', it was made into a bundle and soaked in a caustic soda aqueous solution of 2j% weight for 3Q seconds ff.
= iu soaked in hot water at 30°C while applying tension of j%,
j minute tense situation! Maintained at night, then /cc/I!
The mixture was neutralized in an acetic acid solution, thoroughly washed with water, dried, and rolled into cheese. The threads obtained in this way were knitted into jersey using a nine-striped machine.

1) The knitted fabric was mixed with 60 y/ml of highly sulfated castor oil (sulfation degree 10) in a 73% by weight caustic soda aqueous solution.
The cotton cloth was immersed in the added solution, squeezed to a pink-up rate of 2θ%, and then neared for 0 seconds.

At this time, the moisture content was 700% by weight based on the amount of i+1, j:v471j. In this state, hang it on a tenter and pull it 2θ% in the length direction and 50% in the width direction.
Heating at 700°C for 70 seconds followed by 3θ heating at 770°C.
Heated for seconds. After that, I.

The sample was washed with warm water at °C, neutralized with an aqueous solution of cc/l of acetic acid, and then washed with water and then turned over. In this way, dry mercerization processing was performed.

The knitted fabric thus obtained was treated with 111VC mixed water solution of nonionic activator and soda ash. ! ? 0°CT j O min 1r
, il tr'j IJli, bleached with hydrogen peroxide and stabilizer solution for 75 minutes at 0℃, and then finished with a fabric softener.As a result, compared to conventional mercerized knitted fabrics, A knitted fabric with good texture and excellent luster was obtained.

In addition, the knitted fabric after the above-mentioned dry mercerization process is dyed with a reactive dye (remazol).
Although dyed for z0 minutes at gθ~gθ℃, compared to a knitted fabric in which the yarn and fabric were mercerized twice using the conventional method, a dyed product with the same permeability with go% of the dye was obtained. was completed. This confirmed the superiority of the method of this invention.

Claims (1)

[Claims] Yarn containing cellulose fibers is impregnated with a caustic alkali aqueous solution, mercerized under tension in a wet state, and then knitted to form a knitted fabric.Then, this knitted fabric is allowed to contract freely and then a caustic alkali solution is applied to the knitted fabric. A knitted fabric characterized by absorbing an aqueous solution, pulling the knitted fabric from the caustic aqueous solution, continuously pulling the knitted fabric in the length direction and width direction while reducing the water content, and then removing the caustic alkali. mercerization processing method.