JP3029846B2 - Mercerizing the yarn - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a method for uniformly mercerizing cellulosic fiber yarns in a cheese state.

(Conventional technology) It has been well known that dyeing properties, dimensional stability by washing, and strength are improved by mercerizing cellulosic fibers. The batch method of immersing in an alkaline bath while tensioning in the form of a skein or the continuous method of immersing yarn in an alkaline bath under continuous tension are generally used.
There are a cone-to-cone method in which yarns are processed one by one, and a rope method and a beam method in which yarns are processed in bundles.

(Problems to be Solved by the Invention) In these conventional methods, both the batch method and the continuous method require complicated steps such as winding, and have many problems in the uniformity and reproducibility of the mercerization process.

In recent years, a method of mercerizing cheese has been attempted, but a method of uniformly mercerizing the inner layer to the outer layer of cheese has not yet been developed.

The present invention has been made in view of such circumstances,
It is an object of the present invention to obtain a method in which a cellulose-based yarn can be uniformly mercerized from the inner layer to the outer layer in a cheese form.

(Means for Solving the Problems) The present invention achieves the above object, and has the following configuration.

That is, the present invention provides a yarn made of a cellulosic fiber or a blended fiber of a cellulosic fiber and another fiber.
A gist of a method of mercerizing yarn, comprising immersing the yarn in water in advance and swelling it in water before immersing it in an alkaline solution in a cheese form, followed by mercerization. It is.

 Hereinafter, the present invention will be described in detail.

The cellulosic fibers referred to in the present invention are fibers composed of cellulose molecules such as cotton, hemp, rayon, polynoddy crayon, etc., and the other fibers to be blended are ordinary fibers other than cellulosic such as protein fibers and synthetic fibers. Fiber in general.

In the method of the present invention, a mercerized yarn composed of a cellulosic fiber or a blended fiber of a cellulosic fiber and another fiber is formed by the following method.

First, the above-mentioned yarn is wound around cheese. The winding shape is
Either a parallel type or a taper type may be used. The winding density is
Its suitability varies depending on the yarn count, but is generally 0.15 to 0.
It is preferable to control between 40 g / cm ³ . In order to achieve uniform mercerization, it is necessary to control the density uniformly from the inner layer to the outer layer, to prevent ribbon winding and to pay attention to the shape of the shoulder of the cheese. As the dyeing bobbin used for the core, select a dyeing bobbin having a strength enough to withstand shrinkage due to swelling of cellulose during alkali treatment, or use a crashable bobbin or a shrinking bobbin that shrinks in a radial direction.

After the yarn wound in this manner is packed in a packaging dyeing machine, prior to the mercerization process, the method of the present invention firstly involves immersing the inside of the fiber in an aqueous solution in which an alkali-resistant penetrant is dissolved. It is necessary to allow the fibers to sufficiently penetrate and swell the fibers. After the cellulosic fibers are sufficiently swollen with water, part or all of the aqueous solution is drained,
Thereafter, an alkaline aqueous solution is introduced so as to have a target concentration.

Examples of the alkali used here include lithium hydroxide, sodium hydroxide, potassium hydroxide, and alkyl ammonium hydroxide. These alkalis can be used alone or as a mixture of two or more, but they should be selected in consideration of the mercerization effect and economy. The concentration of the alkali used varies depending on the type and cannot be determined unconditionally.
The range of% is optimal.

After the alkali is charged, the treatment solution in the package dyeing machine is circulated by the pump attached to the dyeing machine. The discharge pressure of the pump is
It is necessary to set the pressure higher than the pressure at the time of normal staining, and it is generally between 1.5 and 4 times. The circulation of the processing solution is based on IN-OU
Repeating T and OUT-IN tends to improve the uniformity of the mercerizing effect, and the optimal time distribution between IN-OUT and OUT-IN is about 3: 2 to 5: 1. After charging the alkali, set the temperature of the processing solution to any temperature between 30 and 90 ° C,
The treatment liquid is circulated for 10 to 60 minutes to allow the alkali to sufficiently adsorb to the cellulosic fibers.

After the alkali is sufficiently adsorbed on the cellulosic fiber,
The treatment liquid is drained, and washing with water and washing with hot water are repeated to completely remove the alkali.

The yarn composed of the cellulosic fiber or the blended fiber of the cellulosic fiber and other fibers which has been subjected to the mercerization treatment in this way is dyed as it is in the form of cheese or dyed into a woven or knitted fabric.

(Operation) The inventors of the present invention consider as follows why the cellulosic yarn can be uniformly mercerized in the form of cheese according to the method of the present invention.

As in the method of the present invention, when the cellulosic fibers are sufficiently swollen with water in advance and an alkaline aqueous solution is added thereto, the adsorption of alkali to cellulose occurs while gradually displacing water in the cellulose molecules. As a result, swelling due to alkali also occurs slowly, and therefore, uniform mercerizing of cellulosic fibers becomes possible.

(Example) Next, the method of the present invention will be described more specifically with reference to examples.

Example 1 A 60-counter comb yarn of Egyptian cotton (twist coefficient 3.8) was wound on a stainless steel bobbin at a winding density of 0.3 g / cm ³ to form a cheese. One package of this cheese is 200kg batch (200
The mixture was packed in a cheese dyeing machine of 0) and treated at 60 ° C for 20 minutes in an aqueous solution in which 2 g of an alkali-resistant anionic penetrant was dissolved, whereby water was sufficiently penetrated into the fibers to swell the fibers.

Next, this solution was reduced by half while operating the pump, and then a 30% aqueous sodium hydroxide solution was added to adjust the concentration to 15%.
For a minute. After draining, washing with water and washing with hot water were repeated, and the alkali was thoroughly washed off, followed by blue staining with Remazol Brilliant Blue RN-100 (3% owf, a reactive dye manufactured by Hoechst).

When this yarn is taken out from the inner, middle and outer layers of cheese and used together to knit a plain sheet of jersey, it is very shiny and is dyed uniformly without spots. Obtained. The shrinkage after washing is 3%
The latitude was 2% and there was almost no inclination.

For the purpose of comparison with the method of the present invention, in this example, except that a pre-process for swelling the fiber by infiltrating water into the fiber was omitted,
A comparative jersey was knitted in exactly the same manner as in this example.

In the obtained knitted fabric, spots occur between the inner, middle and outer layers,
It was not uniformly dyed.

Example 2 A 50-yarn single yarn having a mixing ratio of cotton / silk of 80/20 was wound with a winding density of 0.2.
At 5 g / cm ³ , it is wound on a polypropylene crushable bobbin and 100 kg dyed on a cheese dyeing machine (1200).
Each fiber (95 kg) was packed and treated at 60 ° C. for 10 minutes in an aqueous solution containing 2 g of an alkali-resistant penetrant to swell the fibers and then completely drained.

Next, a 12% aqueous potassium hydroxide solution was added,
Mercerize treatment was performed at 30 ° C. for 30 minutes. After draining, repeat washing with water to thoroughly remove the alkali, and then add 2 g / acetic acid.
And washed with water, taken out and dried.

The yarn is mixed in a band across the inner, middle and outer layers of cheese, woven into a broad cloth, and immersed in a dye solution of 25g / Sumifix 5BS (reactive dye manufactured by Sumitomo Chemical Co., Ltd.) using this woven fabric. Squeezed liquid (Pickup 85
%), And then dried, followed by caustic soda 10g /, salt 250g /
Immersed in the processing solution of, and after squeezing solution (100% pickup), 104
When dyed in solid red by the continuous method of reacting in steam at 20 ° C for 20 seconds, the fabric was dyed uniformly without spots, and a fabric with excellent color clarity and fiber gloss was obtained.

For the purpose of comparison with the method of the present invention, in this example, water was infiltrated into the fibers and the previous step of swelling the fibers was omitted.
A broad cloth for comparison was obtained in exactly the same manner as in this example.

The resulting broadcloth had uneven staining between the inner, middle and outer layers and was not uniformly stained.

(Effects of the Invention) According to the method of the present invention, it is possible to improve the cellulosic fiber in the cheese state of yarn in terms of uniform dyeability over the inner layer, middle layer, and outer layer, dimensional stability by washing, and strength.

Claims (1)

(57) [Claims] When a yarn made of a cellulosic fiber or a blended fiber of a cellulosic fiber and another fiber is immersed in an alkaline solution in the form of a cheese and then mercerized, the yarn is immersed in water in advance. Swelling and then mercerizing the yarn.