JPS60167978A - Treatment of linen fiber - 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 The present invention relates to a method for treating linen fiber sliver (hereinafter referred to as "linen sliver"). More specifically, prior to wet spinning the linen sliver, the linen sliver is moistened.

This relates to a method in which the material is wound onto a bobbin, treated with a high-temperature alkaline aqueous solution, and then treated with a smoothing agent and a sizing agent.

There are two methods for spinning linen fiber: wet and dry.The wet method spins linen fibers in a wet state.
The purpose is to separate linen fibers into individual filaments, thereby making it possible to spin fine yarn. That is, Rin fibers are usually coarse and long fibers with a thickness of 30 to 40 deniers and a length of 20 to 70 m (about 20 to 70 m); The single fibers are mutually coated with pectin,
Lignin.

Since the linen fibers are bonded to each other by a cohesive substance such as hemicellulose, wetting the linen fibers reduces the adhesive force of the colloid substance, and by drafting the linen fibers, the linen fibers are separated into individual filaments. By increasing the number of fibres, fine-count spun yarn can be spun.

Conventionally, in the wet spinning method of linen fiber, pectin and lignin are used to bond single fibers together.

As a method of wetting linen fibers to reduce the adhesive strength of adhesive substances such as hemicellulose, a method of treating twisted rovings from a roving machine with hot water is known. However, in this method, the temperature of the fibers of the roving is increased by hot water during processing, so the adhesive force of the adhesive substance is reduced, but in the draft zone in the subsequent spinning process, the temperature of the fibers of the roving is lowered. Since the temperature becomes room temperature and the temperature becomes low, the adhesive force of the adhesive substance increases again, and there is a drawback that collective migration of fibers occurs during drafting, resulting in the generation of draft rings.

The present invention aims to overcome these conventional drawbacks, and its purpose is to provide a method for processing linen fibers that can improve the uniform draft and the strength of the spun yarn in wet spinning. .

That is, the present invention wets linen sliver.

The gist of the method is that the sliver is then wound onto a bobbin, and then the sliver is treated with a high-temperature alkaline aqueous solution and firstly treated with a smoothing agent and a sizing agent.

The present invention will be explained in detail below.

In the present invention, linen slivers are first moistened by immersing them in water, etc., and adhesive substances such as pectin, lignin, and micellerose adhering to the linen slivers are swollen and their adhesive strength is reduced. . Such a wet treatment facilitates the dissolution and removal of adhesive substances during the subsequent alkali treatment.

Following the wetting process, the linen sliver is wound onto a bobbin.

The linen sliver, which is wound onto a bobbin with the adhesive strength of the adhesive substance reduced by the wet treatment, is then subjected to an alkaline treatment at high temperature to remove the lignin.

Adhesive substances such as hemicellulose are dissolved and fallen off.

At this time, pectin and the like are also removed along with lignin and hemicellulose. The rate of shedding of adhesive substances in such alkali treatment is preferably 5% by weight or more and 25% by weight or less. When the shedding rate is within this range, it becomes easy to separate the fibers by drafting in the subsequent spinning process, and it is possible to reduce the decrease in strength of the yarn after spinning.

Next, it is treated with a smoothing agent and a sizing agent. The smoothing agent treatment improves the drafting properties of the fibers in the draft zone during the spinning process, allowing for uniform drafting. Therefore, the uniformity of the spun yarn is improved. Also.

The sizing agent treatment increases the convergence of the fiber bundle in the draft zone, resulting in a good draft control effect (which enables uniform drafting, improves the strength of the yarn during spinning, and reduces yarn breakage during spinning). Decrease. Again.

It is also possible to improve workability during weaving and knitting.

As described above, by treating with a smoothing agent and a sizing agent, the draft property during spinning is improved, and the strength of the spun yarn is improved, which reduces yarn breakage during spinning and improves processability after spinning. can.

In the above-mentioned alkaline treatment, the rate of dissolution and shedding of the stickiness of the linen sliver is adjusted by taking into account the treatment agent, treatment liquid concentration, treatment liquid temperature, treatment time, etc.

Caustic soda, soda ash, etc. are used as processing agents. Caustic soda and soda ash have different dissolution and shedding rates of adhesive substances under the same processing conditions.

The draft properties of the treated slivers during spinning are also different.

Under the same treatment conditions, caustic soda treatment has a higher rate of dissolution and shedding of adhesive substances than soda ash treatment. If the conditions for the caustic soda treatment and the soda ash treatment are different, and the shedding rates of adhesive substances are made to be the same, the draft properties during spinning will also be the same. That is, the draft property during spinning largely depends on the shedding rate of adhesive substances.

Examples of specific treatment conditions for the alkali treatment are shown below.

In the case of caustic soda treatment, the seeding degree is 0.1-7% by weight, preferably 0.5-5% by weight, and the treatment temperature is 70-70% by weight.
The temperature is 120°C, preferably 80-100'C, and the treatment time is 0.5-3 hours, preferably 1-2 hours.

In the case of soda ash treatment, the concentration is preferably 1 to 20% by weight, preferably 5 to 10% by weight, and the treatment temperature and treatment time are preferably similar to those in the case of caustic soda.

Next, processing using a smoothing agent and a sizing agent in the present invention will be described. Treatment with smoothing agents and adhesives.

It is preferable to use a processing liquid containing a smoothing agent and a sizing agent. Of course, the processing liquid containing the smoothing agent and the processing liquid containing the sizing agent may be separate liquids.

Further, the pretreatment agent is preferably an aqueous solution such as an aqueous solution or an aqueous emulsion, and an aqueous solution is particularly preferred. The concentration and degree of the smoothing agent is preferably 0.1 to 1.5% by weight,
The concentration of the sizing agent is preferably in the range of 0.3 to 3% by weight.

As the smoothing agent, any ordinary oil or surfactant can be used, but vegetable oil and mineral oil-based oils are preferred, and nonionic and anionic surfactants are preferred. In particular, a nonionic surfactant made of a copolymer of polyethylene oxide and polypropylene oxide not only acts as a smoothing agent, but also has good water permeability into linen sliver and compatibility with sizing agents, making it extremely effective. .

As the sizing agent, any normal textile sizing agents such as starch-based, polyvinyl alcohol-based, and acrylic ester-based sizing agents can be used, but the viscosity of the aqueous solution is low (.

No stickiness between sliver and roller during infiltration.

In addition, an acrylic ester-based glue is preferred because it provides strong adhesion between fibers after drying.

Next, the configuration of the method of the present invention will be explained in detail using illustrated examples.

FIG. 1 shows a simplified side view of an embodiment of an apparatus for carrying out the method of the invention.

First, moisten the linen slivers by soaking them in water.

The linen sliver is taken out of the water, placed in a can (1), and left to stand naturally to reduce the adhesive strength of the sticky substance. Next, the sliver (2) is taken out from the can (11), passed through the guide roller (3), and then passed through the drawing port (4).

(4゛) to squeeze out excess water, then use a linen sliver (2
) to improve the convergence of linen sliver +
Pass 2) through the rubbing apron +5), (5').

After rubbing, the linen sliver (2) is wound onto a bobbin (7) driven by a drum (6).

If the linen sliver is immersed in water, then taken out of the water and left to stand naturally, the adhesive force of the adhesive substance can be sufficiently reduced, and the adhesive substance can be effectively dissolved and removed during the 9th alkaline treatment. I can do it. of course,
The linen sliver may be dipped in water to become wet while traveling.

The sliver (2) wound around the bobbin (7) is then heated to a high temperature using a conventional cheese dyeing processing device (not shown) in order to melt and remove the adhesive substances adhering to the sliver, which have decreased adhesive strength. The glue is treated with an alkaline aqueous solution to remove adhesive substances with a removal rate of 5 to 25%.

Due to the shedding of such adhesive substances, the adhesive force between the single fibers constituting the linen fibers further decreases, making it easier to separate the single fibers.

Fiber separation in the draft zone during spinning is improved.

After the alkali treatment, it is then treated with an aqueous solution containing a smoothing agent and a sizing agent in a cheese dyeing processing device to further improve the draft properties, and the sizing agent improves the cohesiveness of the fibers, resulting in better draft control. A uniform draft can be performed.

Furthermore, the strength of the yarn during spinning can be increased.

By the above-mentioned method of the present invention, adhesive substances can be removed! The shedding facilitates the separation of single fibers and improves the bifiltability.

The linen sliver (2), which has improved draftability and cohesiveness by treatment with a smoothing agent and a sizing agent, is then spun by a spinning device, an example of which is shown in the simplified side view of FIG. After the linen sliver (2) passes through the guide 01), it is thoroughly soaked with water using the water supply device (1).

Next, the bank roller (14) in the pre-draft zone θ
.

(14') and front roller Ot9. (15') and then the main draft zone (1[9').
After main drafting with the bank roller (lη, (17') and front roller 01. (18'), the yarn is false-twisted with the air false-twisting device +Im to make a non-twisted yarn (Y), passed through the guide roller ■ and then transferred to the heat drum. (21) and dry in a drum (21).
2) and wind it onto the cheese (23) driven by.

In the method of the present invention, the linen sliver is first soaked in water or the like to moisten it, thereby reducing the adhesive force of the adhesive substance contained in the linen fibers and increasing the bonding force between the single fibers forming the linen fibers. It can be weakened to make it easier to split. In addition, linen slivers with reduced adhesion of adhesive substances are wound onto a bobbin and then treated with a high-temperature alkaline aqueous solution, so that the adhesive substances can be easily removed and the single fibers that make up the linen fibers can be easily removed. can further reduce the adhesive strength of the fibers, making it easier to separate single fibers,
It is possible to improve fiber separation in the draft zone during wet spinning. Furthermore, since the yarn is treated with a smoothing agent and a sizing agent, the drafting properties in the draft zone are good and the strength of the yarn can also be increased.

The present invention will be specifically explained below with reference to Examples.

Example: Stretch-cut linen sliver (70 gel/6 yards) with an average fineness of 30 denier and an average fiber length of 110 mm.
After being wetted by immersing it in water, it was left to stand naturally in a can of the apparatus shown in FIG. 1, and wound up onto a bobbin while being rubbed using the apparatus shown in FIG. Subsequently, the wound linen slivers were treated with alkali under various treatment conditions shown in the following table, and then treated with an aqueous solution containing a smoothing agent and a sizing agent under various treatment conditions shown in the same table. At this time, a nonionic surfactant made of a copolymer of polyethylene oxide and polypropylene oxide was used as the smoothing agent, and an acrylic ester was used as the sizing agent. Next, using the spinning device shown in Fig. 2, the pre-draft is 2.5 times the main draft and the main draft is 8 times the draft, and the paper is false-twisted at L'f and dried at 230°C for a length of 150 m.
/n+in to obtain a yarn with a spun hemp count of 40''S.The spinning conditions at this time were as shown in the table below.

As is clear from the table above, N11l to N11 of the present invention
In all cases of L8, the number of thread breaks during spinning was small and the thread strength was high. On the other hand, No. 9 without smoothing agent or adhesive treatment.
and 11kL10 had low yarn strength, a large number of yarn breaks during spinning, and poor spinning quality.

[Brief explanation of drawings]

FIG. 1 is a simplified side view of an embodiment of a rubbing and winding device for carrying out the method of the present invention, and FIG. 2 is a simplified side view of an embodiment of the spinning device. +11-kens, (21-linen sliver, +5
1. (5") - Rubbing apron, +71 - Bobbin, +121 - - Water supply device. θ4 - Pre-draft zone, + IGI - Main draft zone, (1 odor - Air false twisting device, (23) - Cheese. (Y) −No-twist yarn. Patent applicant Unitika Co., Ltd.

Claims (1)

[Claims] (1) A method for treating linen fibers, which comprises moistening a linen sliver, first winding it around a bobbin, then treating the sliver with a high-temperature alkaline aqueous solution, and first with a smoothing agent and a sizing agent.