KR20070046299A - Process for producing lyocell complex yarn, yarn produced thereby and blanket using the same yarn - Google Patents

Abstract

The present invention relates to a method for manufacturing a lyocell composite spun yarn, wherein 0.5 to 0.7 lyocell irradiation is passed through a trumpet and three pairs of draft controllers as an external yarn, and 20 to 40 spun yarn is passed through a yarn guide roller as a screening. After supplying the square triangle on the front roller among the three pairs of draft controllers so that the outer yarn surrounds the screening periphery, the lyocell composite spun yarn characterized in that the composite yarn is manufactured at TM 3.7 to 4.5 and the spindle speed 2000 to 3000 rpm. It relates to a manufacturing method.

The composite spun yarn according to the present invention has a pitch skin effect, has an excellent texture, has a low shrinkage rate when wet, has excellent stability when washing, has a vivid color, excellent dyeing fastness, good peeling, good hygroscopicity, and breathability. High quality blankets can be provided.

Lyocell composite yarn, peach skin, blanket

Description

Process for producing lyocell composite yarn, blanket produced by the same, and a blanket using same {Process for producing Lyocell complex yarn, yarn produced thereby and Blanket using the same yarn}

1 is a view of the spinning machine used in the manufacturing method of the composite spun yarn of the present invention,

2 is an electron micrograph of the lyocell composite spun yarn of the present invention,

3 is an electron micrograph of the envoy of Comparative Example 1;

4 is an electron micrograph of the composite spun yarn of Comparative Example 2,

5 is an electron micrograph of the composite spun yarn of Comparative Example 3.

* Explanation of symbols in the drawings

1: Examination 2: Outward appearance

3: yarn guide roller 4: trumpet

5: front roller 6: spindle

The present invention relates to a method for producing a lyocell composite spun yarn, while having excellent heat retention and excellent hygroscopicity and breathability. Provides composite spun yarn with excellent texture.

Currently blankets are blankets of wool blankets and acrylic blankets. Wool blankets are excellent in warmth but they are not easy to touch when they come into contact with the skin. Acrylic blankets are widely used because they have excellent heat retention, no hair fall, and are inexpensive.However, they are double-cotton composite yarns for warp yarns, and double yarns of acrylic fiber are used for weaving. Although the surface sensation was exhibited by the acrylic fiber, the fiber is constrained by twisting through the composite yarn, and the touch is not good, and it is difficult to use pleasantly due to the static electricity generated due to the characteristic of the acrylic fiber and poor hygroscopicity. Due to these problems, acrylic blankets were recognized and used as temporary bedding for military, school, and group lodgings, and were not recognized as high-quality bedding.

On the other hand, lyocell fiber, which is a kind of cellulose fiber known as environmentally friendly fiber, has good touch when it comes into contact with the human body, and if it is manufactured as the blanket, it can be used for high-end applications such as infants, bedrooms, and hotels. Lyocell fiber is a scientific name of a new material fiber given by BISFA, the organization that established and approved the fiber standard term in 1989. It is a kind of cellulose fiber that combines the excellent functional properties of chemical fiber with the natural texture and hygroscopicity of natural fiber.

Conventional cellulose-based regenerated fibers such as rayon and polynosic have serious problems causing environmental pollution in the manufacturing process because they are made from wood pulp through a chemical treatment called carbon disulfide (CS2). However, since lyocell fiber is manufactured by dissolving pure pulp in a solvent (NMMO) and without chemical reaction in a pollution-free manner, it is possible to maintain high polymerization degree and strength of raw materials, and most solvents for dissolving pulp during the manufacturing process are recovered in the washing process. (99.8%), and is purified and reused, unlike the fiber is a representative environmentally friendly fiber of the 21st century does not generate any pollution in the manufacturing process. For the same reason, lyocell has been spotlighted as an environmentally friendly fiber that has insulation, hygroscopicity, breathability, peeling and durability, and does not cause environmental pollution in the manufacturing process.

The lyocell fiber having such excellent properties has excellent blending properties and can be mixed with other fibers to produce a spun yarn. When mixing in the square step, the lyocell fibers on the spinning or sliver have a very weak tensile strength, so there was a problem of carefully controlling the spinning conditions to prevent the trimming of the lyocell fibers.

Accordingly, the present invention provides a lyocell composite spun yarn having excellent heat retention, excellent hygroscopicity and breathability, and having a unique touch, volume, bulkiness, peeling property, and durability while being able to give a comfortable feeling when used.

In particular, in the present invention is excellent in raising the lyocell irradiation to the outside yarn to be particularly suitable for blanket application, to provide a sufficient tensile strength of the lyocell irradiation and to provide a preferred screening to prevent trimming and TM And by precisely adjusting the draft rate it is possible to manufacture a composite spun yarn excellent in raising.

Therefore, according to the present invention, 0.5 to 0.7 number of lyocells are passed through a trumpet and three pairs of draft controllers as an external thread, and 20 to 40 spun yarns are passed through a yarn guide roller as a screen. After supplying to a tripod so that the outer yarn wraps around the screening, there is provided a method for producing a lyocell composite spun yarn, characterized in that for producing a composite spun yarn at TM 3.7 to 4.5 and a spindle speed of 2000 to 3000 rpm.

The total draft ratio of the three pairs of draft controllers passed through the irradiation is characterized in that 4.5 to 5.0.

The spun yarn is characterized in that the lyocell spun yarn.

In addition, according to the present invention there is provided 1 to 10 lyocell composite spun yarn produced by the production method.

In addition, the present invention provides a blanket using the composite spun yarn as a weft yarn.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

The lyocell composite spun yarn of the present invention is a composite spun yarn in which an outer yarn is wrapped around the screening, and the screening is a spun yarn, and the outer yarn is a draft of a lyocell irradiation.

The lyocell fiber used in the present invention is a cellulose-based regenerated fiber which can be produced by an environmentally friendly manufacturing process, and its physical characteristics are similar to those of natural fiber, and the strength retention in the wet state is 85 to 95% (existing cellulose Regenerated fiber is about 50%), and its modulus is very high, so shrinkage hardly occurs in water wet conditions, so it has excellent dimensional stability. In addition, the strength is much higher than the conventional regenerated fiber and similar to the polyester fiber, excellent blending with synthetic fibers and excellent hygroscopicity.

In the present invention, it is possible to provide a composite spun yarn using lyocell fibers having excellent physical properties and excellent thermal insulation, durability and comfort, especially when used as a blanket.

In the present invention, 20 to 40 spun yarn is used as the screening, and 0.5 to 0.7 number of lyocell irradiation is used as the outer yarn, and the effective raising by the raising process after weaving is performed by drafting and wrapping the lyocell irradiation around the screening. The company is providing a compound yarn to make it possible. Therefore, in the present invention, it is important to manufacture a composite spun yarn that is soft to the touch while at the same time firmly wrapping the lyocell irradiation that surrounds the examination without trimming.

In the present invention, as the screening (1), 20 to 40 spun yarn is fed directly to the front roller (5) of the three pairs of draft controllers through the yarn guide roller (3), and 0.5 to 0.7 number of lions as the outer yarn (2). After passing the cell irradiation through the trumpet (4) and the three pairs of draft controllers, the screening and the outer thread through the traveler to produce a composite spun yarn through a ring spinning machine at TM 3.7 to 4.5 and the spindle (6) speed 2000 to 3000 rpm. can do. The front roller refers to a roller closest to the spindle among the three pairs of draft controllers.

The spun yarn supplied by the screening may be cotton spun yarn, lyocell spun yarn, synthetic fiber spun yarn, or the like. In the present invention, the use of lyocell spun yarn has the advantage that dyeing imbalance does not occur during dyeing. Spun yarn is preferably 20 to 40, but in the case of coarse yarns of less than 20, the blending ratio of the screening / irradiation is too high and sufficient raising may not occur during the raising process for use for blankets. In this case, due to the characteristics of the lyocell fiber, sufficient tensile strength is not given, and thus, it cannot play a role as a screening.

The lyocell irradiation should be well adjusted to 0.5-0.7 water, and the draft ratio should be well controlled so as to wrap around the screening without cutting while forming the composite yarn. The draft roller used in the spinning machine in the present invention is preferably composed of three pairs, the total draft ratio is preferably 4.5 to 5.0. If the draft ratio is less than 4.5, it is difficult to produce a composite spun yarn of sufficient thickness, and if it is more than 5.0, excessive draft may result in problems such as trimming and non-uniform linear density.

In addition, in the present invention, it is preferable to adjust the TM to 3.7 to 4.5. In the TM of less than 3.7, hair loss occurs when raising and weak morphological stability of the external yarn, so that the composite spun yarn may be uneven and the tensile strength is weak. When exceeded, the shape stability of the composite spun yarn may be excellent, but the touch becomes hard.

By the composite spinning method of the present invention, one to ten lyocell composite spinning yarns can be obtained. After weaving with the lyocell composite spun yarn, we can manufacture a blanket after brushing and dyeing.

The blanket of the present invention has an excellent texture by the peach-skin effect using fibrillation made by raising the outer yarn of the lyocell composite spun yarn. In addition, the shrinkage rate when wet has excellent stability when washing, has a vivid color, excellent color fastness and good peeling properties.

Hereinafter will be described in more detail through a limited embodiment of the lyocell composite spun yarn of the present invention.

Example 1

 As the outer thread, 0.6 number of lyocells were passed through three pairs of draft controllers with trumpet and total draft 4.7, and 40 number of lyocells were supplied as screenings and fed directly to the front rollers among the three pairs of draft controllers. And the outer yarn was supplied to the ring spinning machine and wound while being wound to prepare a TM 3.9, three lyocell composite spun yarn.

Comparative Example 1

A 30 twisted lyocell spun yarn was spliced into 10 strands to prepare a twisted yarn.

Comparative Example 2

0.6 number of lyocell irradiation was supplied to the screening, and 40 number of lyocell spinning yarns were supplied as the outer thread, and the screening and the outer thread were supplied to the ring spinning machine and wound up while being twisted to produce a lyocell composite yarn.

Comparative Example 3

In the same manner as in the above example, the composite spun yarn was prepared using only TM as 2.65.

number Ne Super Dead (Ne) Twist (TPI) Remarks Example 40 0.6 (irradiation) 3.9 Fiber length 38-40mm Comparative Example 1 30 N / A 10 strands of joint Comparative Example 2 0.6 (irradiation) 40 N / A Comparative Example 3 40 0.6 (irradiation) 2.65 Fiber length 38-40mm

The number, tensile strength, elongation, and shrinkage rate of the composite spun yarns of the Examples and Comparative Examples were measured as shown in Table 2, and are shown in Table 3.

Experiment item Experimental Standard  Intermarriage rate  KS K0210 Dissolution Method  count  KS K0415, 0414 apparent number  Signed Strength  KS K0409 Foreign Law  Death rate  KSK0215 Heat Shrinkage  Cross section, lateral analysis  Electron Microscope (Hitachi S-3200N) Image Analyzer (STEMI 2000-C)

Example Comparative Example 1 Comparative Example 2 Comparative Example 3 Apparent number (Ne) 3.0 3.0 3.1 3.1 Tensile strength (cN) 5,217.6 3,635.3 3,010.8 1,430.4 Elongation (%) 12.9 17.3 6.0 7.0 Shrinkage (%) -1.6 -3.6 -1.7 -1.2

 As shown in Table 3, Comparative Example 1 in the form of a combination of 10 strands of lyocell spun yarn is high in strength and elongation, but there was a disadvantage that brushing does not occur during raising after fabrication. In Comparative Example 2, although the strength and elongation were good, the lyocell spinning yarn wrapped on the surface at the time of raising was severely broken by the raising by the raising. The composite spun yarn of Comparative Example 3 was very soft in touch but weak in tensile strength and severe in hair fall. The composite spun yarn of Example 1 had the most suitable strength and elongation, had little hair fall, and had a soft touch.

 1 to 4 are micrographs of the composite spun yarn of the Examples and Comparative Examples.

Weaving was performed through a composite yarn of the above Examples and Comparative Examples through a repier weaving machine (FAST). At this time, the tissue was woven by double weaving, which causes the lyocell composite spun yarn, which is the weft, to be blown out on both sides, and the inclined structure is the fabric structure inside, so that only the lyocell part is dyed during the dyeing process. Even if it became a flat salt.

As a result of the weaving, weaving with the composite spun yarn of the embodiment was also in a good brushed state, and the lyocell roving yarn was blown to the outside, resulting in a soft, light-weight fabric. There was a loss of strength, severe hair fall, a feeling of thickness and stiffness. The surface was too hard when weaving in Comparative Example 3, there was a disadvantage in that the strength is reduced by raising to the inclined surface during raising.

The lyocell blanket of the present invention was shown to have very low chargeability of 10V and little generation of static electricity. In particular, it shows lower value than interview, so there is no static electricity and it shows very pleasant contact feeling in skin contact. The air permeability is 7 to 27.9 cm 3 / cm 2 / sec for general blanket fabrics, whereas the blanket of the present invention was found to be 25 cm 3 / cm 2 / sec or more, showing excellent breathability. In the case of moisture permeability, the general blanket was 236-259 g / m 2 h, and the blanket of the present invention showed a value of 280 g / m 2 h or more, and the moisture permeability was also better.

In the case of manufacturing a blanket with the lyocell composite spun yarn of the present invention, fibrillation is performed by raising the outer yarn of the lyocell composite spun yarn and has an excellent texture with a pitch skin effect. In addition, the shrinkage rate when wet is excellent, excellent stability when washing, has a vivid color and excellent color fastness, good peeling properties, hygroscopicity, breathability has the advantage of providing a high quality blanket.

Claims (5)

As the outer thread, 0.5 to 0.7 lyocells are passed through a trumpet and three pairs of draft controllers, and as a screening, 20 to 40 yarns are passed through a yarn guide roller to a square triangle on the front rollers of the three pairs of draft controllers. A method for producing a lyocell composite spun yarn, characterized in that the composite yarn is produced at TM 3.7 to 4.5 and a spindle speed of 2000 to 3000 rpm after the outer yarn is wrapped around the screening. The method according to claim 1, wherein the total draft ratio of the three pairs of draft controllers through which the irradiation passes is between 4.5 and 5.0. The method of claim 1, wherein the yarn is a lyocell spun yarn, characterized in that the lyocell spun yarn manufacturing method. 1 to 10 lyocell composite spun yarn prepared according to any one of claims 1 to 3. A blanket using the composite yarn of claim 5 as a weft yarn.

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