JP2007016356A - Knitted and woven fabric of hollow spun yarn and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide knitted and woven fabric made of hollow spun yarns excellent in light weight, bulkiness, warmth-keeping properties and quick drying properties and having little hollow crushing and a method for producing the same with suppressing environmental pollution. <P>SOLUTION: The knitted and woven fabric mainly comprises hollow spun yarns. The spun yarn is produced by preparing a double layered spun yarn in which a polylactic acid-based fiber is arranged as a core component and dissolving and removing the polylactic acid-based fiber. The method for producing the knitted and woven fabric of hollow spun yarn is to knit and weave the double layered spun yarn in which the polylactic acid-based fiber are arranged as the core component, subsequently treat the same with alkali. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a hollow spun yarn knitted fabric and a method for producing the same.

  Conventionally, a multi-layer spun yarn in which a soluble fiber is arranged as a core component has been proposed. After producing a woven or knitted fabric using this multi-layer spun yarn, the soluble fiber is dissolved and removed to remove the multi-layer spun yarn. A woven or knitted fabric in which a hollow portion is formed at the center of the cross section has been proposed. Since this woven or knitted fabric is excellent in lightness and bulkiness, it is mainly used for inner use.

  For example, Patent Document 1 discloses that polyester-based long fibers are obtained by alkali treatment of a fabric using a composite yarn in which a POY (POY: undrawn yarn) of polyester-based long fibers is covered with a fiber bundle of cotton. A cotton fabric is disclosed in which the POY is removed, and the filament formed from a bundle of cotton fibers has a hollow shape.

In Patent Document 2, water-soluble polyvinyl alcohol fiber is woven using a core-sheath type composite spun yarn in which a polyester fiber is arranged as a sheath component, and then subjected to hot water treatment. A bulky woven or knitted fabric that dissolves and removes the core component has been proposed.
Japanese Patent Publication No. 8-1026 (Claim 1) JP-A-9-302543 (Example 2)

  In the above-mentioned conventional technology, petroleum-based polymers are used up to what is dissolved and removed, and petroleum raw materials are consumed. Further, in the production of these woven and knitted fabrics, the waste liquid after dissolving and removing the core component of the composite spun yarn contains the polymer that constitutes the fiber of the core component, and this polymer does not decompose for a long period of time. There is also a problem of causing environmental pollution because it remains underground.

  The present invention eliminates the drawbacks of the prior art as described above, and is a hollow spun yarn knitted fabric that is excellent in lightness, bulkiness, heat retention and quick drying properties, and has little hollow crushing, and this hollow spun yarn knitted fabric. An object of the present invention is to provide a method for manufacturing efficiently and while suppressing environmental pollution.

  As a result of intensive studies to solve the above problems, the present inventor has used polylactic acid fibers as the core component of the composite spun yarn, and can efficiently dissolve and remove the core component as compared with the conventional method. The present inventors have found that the waste liquid after dissolving and removing the components hardly causes environmental pollution, and reached the present invention.

That is, the gist of the present invention is as follows.
(1) A woven or knitted fabric mainly composed of hollow spun yarn, which is obtained by dissolving and removing the polylactic acid fiber from a multi-layer spun yarn in which the polylactic acid fiber is arranged as a core component. Hollow spun yarn knitted or knitted fabric characterized by being made.
(2) The hollow spun yarn knitted or knitted fabric according to (1), wherein the multi-layer spun yarn is formed by arranging the polylactic acid fibers in a multi-core manner.
(3) The hollow spun yarn knitted or knitted fabric according to (1) or (2) above, wherein the multi-layer spun yarn is formed by arranging a cellulosic fiber as a sheath component.
(4) The hollow spun yarn knitted fabric according to any one of (1) to (3) above, wherein the multi-layer spun yarn comprises polyester short fibers as a sheath component.
(5) The hollow spun yarn knitted fabric according to the above (4), wherein the polyester short fiber is a hollow fiber.
(6) The hollow according to (4) or (5), wherein the multi-layer spun yarn is formed by disposing a cellulosic fiber in an outer portion as a sheath component and a polyester short fiber in an inner portion. Spun yarn knitted fabric.
(7) The hollow according to any one of (1) to (6) above, wherein weaving and knitting using a multi-layer spun yarn having a polylactic acid fiber as a core component, followed by alkali treatment Manufacturing method of spun yarn knitted fabric.

  The hollow spun yarn knitted fabric of the present invention is excellent in lightness, bulkiness, heat retention and quick drying. Therefore, the hollow spun yarn knitted fabric of the present invention can be widely used for apparel, and can be suitably used for inner use that directly touches the skin.

  Further, according to the method for producing a hollow spun yarn woven or knitted fabric of the present invention, since the woven or knitted fabric containing the above-mentioned multi-layer spun yarn is subjected to alkali treatment, there is no concern that the hollow portion will be crushed by the weaving and knitting, and the core component polycrystal is efficiently produced. The lactic acid fiber can be dissolved and removed. And the waste liquid after an alkali treatment can be disposed of without contaminating the environment by a normal neutralization treatment.

  Hereinafter, the present invention will be described in detail.

  The hollow spun yarn knitted fabric of the present invention is a woven or knitted fabric using hollow spun yarn. The hollow spun yarn refers to a spun yarn having a hollow portion where no fiber exists in the cross section of the spun yarn. Examples of the cross-sectional shape of the hollow spun yarn include a single-hole type shown in FIGS. 1, 5, and 6, and a multi-hole type having a plurality of hollow parts represented by a two-hole type shown in FIG. .

  The hollow rate of the hollow spun yarn is preferably 10 to 25%. The hollow ratio of the hollow spun yarn refers to the ratio of the cross-sectional area of the hollow portion to the total cross-sectional area including the hollow portion in the cross-section of the spun yarn. If the hollow ratio of the spun yarn is less than 10%, the heat retention due to having the hollow portion tends to decrease, which is not preferable. On the other hand, if it exceeds 25%, the hollow portion tends to be crushed by an external force, which is not preferable.

  The hollow spun yarn in the present invention can be obtained by dissolving and removing the polylactic acid fiber from a multi-layer spun yarn comprising polylactic acid fiber as a core component. The dissolution removal of the polylactic acid fiber may be performed before or after the weaving. Examples of the cross-sectional shape of the multi-layer spun yarn are shown in FIGS. The arrangement of the polylactic acid fibers may be a multi-core type having a plurality of core components represented by the 2-core type shown in FIG. 4 in addition to the single-core type as shown in FIGS. .

  Examples of the polylactic acid fiber include poly L-lactic acid in which the structural unit of lactic acid is L-lactic acid, poly D-lactic acid in which the structural unit is D-lactic acid, and poly which is a copolymer of L-lactic acid and D-lactic acid. D, L-lactic acid, or polylactic acid stereocomplex composed of poly-D-lactic acid and poly-L-lactic acid, a copolymer of D-lactic acid and hydroxycarboxylic acid, and a copolymer of L-lactic acid and hydroxycarboxylic acid A polylactic acid fiber formed of a polylactic acid polymer such as a coalescence, a copolymer of D-lactic acid, L-lactic acid, and hydroxycarboxylic acid can be used.

  Here, examples of the hydroxycarboxylic acid include glycolic acid, hydroxybutyric acid, hydroxyvaleric acid, hydroxypentanoic acid, hydroxycaproic acid, hydroxyheptanoic acid, and hydroxycaprylic acid.

  The number average molecular weight of the polylactic acid-based polymer is preferably from 20,000 to 150,000, more preferably from 40,000 to 150,000, from the viewpoint of yarn production. The melting point of the polylactic acid-based polymer is preferably 120 ° C. or higher, more preferably 150 ° C. or higher, from the viewpoint of suppressing fiber melting due to heat reception in the sizing step.

  The cross-sectional shape of the polylactic acid fiber may be any shape, but it is preferable to employ a hollow fiber when it is desired to shorten the time required for dissolution and removal. The form of the fiber may be either a long fiber or a short fiber.

  The crystallinity of the polylactic acid fiber is preferably in the range of 10 to 40% from the viewpoint of improving the mechanical strength of the fiber. In order to achieve the crystallinity in the above range, heat treatment or stretching may be performed. In particular, it is preferable to add a crystal nucleating agent such as talc, boron nitride, calcium carbonate, magnesium carbonate, and titanium oxide to the polylactic acid-based polymer because the crystallinity can be easily improved. The addition of the crystal nucleating agent not only improves the mechanical strength of the fiber, but also improves the heat resistance, and also prevents the fusion (blocking) between yarns in the melt spinning process and the cooling process. preferable. The addition amount of the crystal nucleating agent is preferably 0.1 to 3.0% by mass and more preferably 0.2 to 2.0% by mass with respect to the polylactic acid polymer.

  On the other hand, the fiber of the sheath component of the multi-layer spun yarn is not particularly limited, but synthetic fibers such as polyester, nylon, acrylic and polyurethane, semi-synthetic fibers such as diacetate and triacetate, polynosic and viscose rayon Regenerated fibers such as copper ammonia rayon and solvent-spun cellulose fibers, and natural fibers such as cotton, hemp, bamboo, silk, and wool can be used. Among these, it is preferable to use cellulosic fibers from the viewpoint of improving the bulkiness of the hollow spun yarn knitted fabric. Examples of the cellulosic fiber include polynosic, viscose rayon, copper ammonia rayon, solvent-spun cellulose fiber, cotton, hemp, bamboo fiber and the like.

  In the sheath component, a plurality of types of fibers may be mixed and used. The mixing form may be either a mixed spinning or a multilayer structure, but it is preferable to adopt a multilayer structure in that the characteristics of each fiber can be effectively reflected in the hollow spun yarn knitted fabric. A multilayer structure refers to an embodiment in which a plurality of fiber layers are overlapped. The number of fiber layers can be appropriately set, but two layers are preferable from the viewpoint of production.

  The fiber form of the sheath component may be either a long fiber or a short fiber, but a short fiber is preferred from the viewpoint of improving the texture of the hollow spun yarn knitted fabric. In particular, polyester short fibers are preferable in terms of improving quick drying properties.

  The cross-sectional shape of the fiber of the sheath component is not particularly limited, and may be an elliptical shape, a triangular shape, a polygonal shape, a well-shaped cross-section shape such as a well shape in addition to a normal round cross section. In particular, when a hollow type such as a macaroni type or a well type (hereinafter, a fiber having a horizontal cross-sectional shape is referred to as a hollow fiber) is adopted as the cross-sectional shape, the lightness and heat retention of the woven or knitted fabric can be improved. . This is due to the synergistic effect of the hollow portion of the hollow spun yarn, that is, the macro hollow portion, and the micro hollow portion existing inside the fiber constituting the sheath component. However, in calculating the hollow ratio of the hollow spun yarn as described above, the microscopic hollow portion inside the hollow fiber is not regarded as a hollow portion.

  In addition, as for the hollow ratio (area ratio which the said hollow part occupies with respect to the hollow fiber whole cross-sectional area containing a hollow part) of the said hollow fiber concerning a micro hollow part, 10-50% is preferable. When the hollow ratio is less than 10%, the effect of forming hollow fibers is poor. On the other hand, those having a hollowness ratio exceeding 50% are not preferred because they are difficult to produce stably.

  The fineness of the sheath component fiber is preferably 0.5 to 3.3 dtex. The fiber length in the case of short fibers is preferably 30 to 60 mm. By setting the fineness and the fiber length within the above ranges, the entanglement between the fibers is improved, and even when the hollow spun yarn knitted fabric is subjected to an external force such as rubbing, the fiber layer is less likely to be displaced or peeled off.

  The hollow spun yarn knitted fabric of the present invention is excellent in lightness, bulkiness, heat retention and quick drying, but in order to further improve these characteristics, the hollow spun yarn is composed of a cellulose fiber layer and a polyester short fiber. It preferably has a two-layer structure with a layer composed of Cellulose fibers can improve the bulkiness of the hollow spun yarn knitted fabric, and polyester short fibers can improve the quick-drying property. In particular, it is preferable to dispose the cellulosic fibers on the outside and the polyester short fibers on the inside because the bulkiness of the hollow spun yarn knitted fabric can be further improved. The cross-sectional shape of such a hollow spun yarn is illustrated in FIG.

  In the present invention, it is particularly preferable that the polyester short fiber is a hollow fiber, since the lightness and heat retention can be further improved. FIG. 6 illustrates a cross-sectional shape of a hollow spun yarn in which cellulosic fibers are arranged on the outside and hollow polyester short fibers are arranged on the inside.

  In the present invention, yarns other than the hollow spun yarn described above (hereinafter referred to as other yarns) may be included in the woven or knitted fabric as long as the effects of the present invention are not impaired. However, the mass ratio of the hollow spun yarn in the woven or knitted fabric is preferably 60% by mass or more in order to fully exhibit the effects of the present invention.

  The type of other yarn is not particularly limited. In addition, the composite form of the other yarns in the woven or knitted fabric is not particularly limited, and examples thereof include union knitting, arrangement, mixed fiber, and twisting.

  Next, a method for producing the hollow spun yarn knitted fabric of the present invention will be described.

  In order to produce the hollow spun yarn knitted fabric of the present invention, first, a multi-layer spun yarn having a cross-sectional shape as shown in FIGS. Is prepared in advance.

  Such a multi-layer spun yarn can be obtained by ordinary spinning means. For example, in order to obtain a multi-layer spun yarn having a cross-sectional shape as shown in FIG. 3, first, as shown in FIG. 9, a sliver (SA) made of polylactic acid fiber and a sliver (SB) made of sheath component fibers are used. ) To the roving machine in parallel, and the roving yarn is spun while SB is wound around the SA. Next, this roving can be obtained by spinning.

  In order to obtain a multi-layer spun yarn having a cross-sectional shape as shown in FIG. 4, it can be obtained by finely spinning and twisting a roving yarn comprising a polylactic acid fiber as a core component.

  In order to obtain a multi-layer spun yarn having a cross-sectional shape as shown in FIGS. 7 and 8, first, as shown in FIG. 10, a sliver (SB1) made of fibers in the inner portion of the sheath component and an outer portion of the sheath component. The sliver (SB2) made of fibers is superposed on the roving machine, and the roving yarn is spun while SB1 and SB2 are wound around the SA. Next, this roving can be obtained by spinning. In addition, while providing a certain interval in the positional relationship between SB1 and SB2, the SA and the rough spinning machine are supplied in parallel to the SA, and the SA is used as a core, and the SB1 and SB2 are sequentially wound around the SA to spin the roving yarn. It can also be obtained by spinning a roving yarn. Alternatively, first, SA and SB1 are supplied to the roving machine in parallel, and the roving yarn (RA) is spun while SB1 is wound around the SA. Next, this RA and the roving yarn (RB) made of fibers of the outer portion of the sheath component obtained by ordinary spinning means are supplied in parallel to the spinning machine, and the spinning is performed while winding the RB around the RA. Can also be obtained.

  Next, after weaving and knitting by the usual weaving and knitting means using the above multi-layer spun yarn, alkali treatment is performed. Compared with the case of weaving and knitting after subjecting the multi-layer spun yarn to alkali treatment, there is no possibility of hollow crushing during the weaving and knitting process, which is advantageous. As the treatment liquid used for the alkali treatment, a sodium hydroxide aqueous solution having a concentration of 20 to 30 g / L is usually preferable. As processing conditions, it is preferable to process at 80-100 degreeC for 30 to 60 minutes using a liquid dyeing machine. By such alkali treatment, it is possible to dissolve and remove the polylactic acid fiber, which is the core component of the multilayer spun yarn, to obtain a hollow spun yarn. Since the polylactic acid polymer contained in the waste liquid after the alkali treatment has biodegradability, if the waste liquid is appropriately subjected to normal neutralization treatment and then discarded, it does not cause environmental pollution.

  Moreover, in the manufacturing method of this invention, you may perform a preset, dyeing | staining, final setting, etc. as needed. In particular, when a synthetic fiber is arranged as a sheath component of a multi-layer spun yarn, the shape stability of the hollow spun yarn knitted fabric can be improved by performing a preset before the alkali treatment. This is because the synthetic fiber of the sheath component is heat-set, and it is difficult to cause hollow crushing due to washing or ironing after becoming a garment.

  The conditions for the presetting may be set as appropriate in consideration of the type of synthetic fiber. If the temperature is too low or the treatment time is too short, the synthetic fiber of the sheath component may not be sufficiently heat-set, which is not preferable. On the other hand, if the temperature is too high or the treatment time is too long, the synthetic fiber of the sheath component may turn yellow and the texture of the woven or knitted fabric may be cured, which is not preferable.

  Next, the present invention will be specifically described with reference to examples. In addition, each hollow rate of the hollow spun yarn and hollow polyester short fiber in an Example was computed with the following method.

(1) Hollow ratio of hollow spun yarn First, hollow spun yarn is sampled from the finally obtained hollow spun yarn knitted fabric, and the cross-sectional shape of the spun yarn is photographed with an electron microscope (500 times magnification). The part corresponding to the whole spun yarn including the hollow part is cut out and the mass (A) is measured. After the measurement, a portion corresponding to the hollow portion is cut out and its mass (B) is measured. This operation is performed for 10 samples, the average values of A and B are calculated, and those values are substituted into the following formula to obtain the hollow ratio of the hollow spun yarn.

(2) Hollow ratio of hollow polyester short fiber Take a cross-sectional shape of the hollow polyester short fiber with an electron microscope (magnification: 7500 times), trace the photo and cut out the part corresponding to the whole hollow polyester short fiber including the hollow part The mass (C) is measured. After the measurement, a portion corresponding to the hollow portion is cut out and its mass (D) is measured. This operation is performed for 10 samples, the average values of C and D are calculated, and those values are substituted into the following formula to obtain the hollow ratio of the hollow polyester short fiber.

Example 1
Polylactic acid fibers ("Terramac (trade name)" manufactured by Unitika Ltd., 1.7 dtex x 38 mm) and cotton (Egypt ultra-long cotton, 1.3 dtex x 38 mm) are introduced separately into the spinning process. A sliver SA made of polylactic acid fiber and a sliver SB made of cotton were obtained. The mass ratio per unit length of these two slivers was SA: SB = 2: 8.

  Next, when supplying the above-mentioned two types of sliver to the roving machine shown in FIG. 9, the sliver SB was supplied to the inside of the draft area as viewed from the position of the fryer head 11, and the sliver SA was supplied to the outside. Each sliver is drafted in the process of passing through the apron 7 and the second roller 8 after passing through the back roller 6, passing through the front roller 9, winding the sliver SB around the sliver SA to form a fiber bundle 10, and then a rotating flyer Was twisted and wound up as a roving yarn having a thickness of 240 gr / 30 yd (1 gr = 0.065 g, 1 yd = 0.9144 m) and a twist number of 1.0 T / 2.54 cm. Subsequently, the two spun yarns were used for fine spinning and twisting to obtain a double-layer spun yarn of 40 count double yarn (English cotton count).

  The obtained multi-layer spun yarn was a two-core multi-layer spun yarn having a cross-sectional shape as shown in FIG.

Next, using this multi-layer spun yarn, a tentacle knitting was knitted with a single circular knitting machine having a hook diameter of 76 cm and a needle density of 22 / 2.54 cm. Then, the obtained raw machine was alkali-treated in an aqueous solution of sodium hydroxide having a concentration of 20 g / L at a bath ratio of 1:20 at 97 ° C. for 30 minutes. Thereafter, dyeing was performed using a reactive dye at 80 ° C. for 60 minutes, and after softening, final setting was performed at 160 ° C. for 2 minutes using a pin tenter to obtain a hollow spun yarn knitted fabric of the present invention.
The hollow spun yarn contained in the hollow spun yarn knitted fabric had a cross-sectional shape as shown in FIG. 2, and the hollow ratio of the hollow spun yarn was 20%.

(Example 2)
Polylactic acid fiber ("Terramac (trade name)" manufactured by Unitika Ltd., 1.7 dtex x 38 mm), hollow polyester short fiber (1.4 dtex x 38 mm), and cotton (Egypt ultra-long cotton, 1.3 dtex x 38 mm) were separately fed into the spinning process to obtain a sliver SA made of polylactic acid fibers, a sliver SB1 made of hollow polyester short fibers (hollow rate 12%), and a sliver SB2 made of cotton. The mass ratio per unit length of these three slivers was SA: SB1: SB2 = 3: 5: 12.

  Next, when supplying the above three types of sliver to the roving machine shown in FIG. 10, the sliver SB1 and SB2 are overlapped so that SB1 is arranged on the SA side, and the draft area as seen from the position of the flyer head 11 Supplied inside. Sliver SA was supplied to the outside of the draft area. Each sliver passes through the back roller 6 and is drafted in the process of passing through the apron 7 and the second roller 8. After passing through the front roller 9, the sliver SB 1 and SB 2 are wound around the sliver SA to form a fiber bundle 10, and then rotated. And twisted with a fryer, and wound up as a roving yarn having a thickness of 280 gr / 30 yd (1 gr = 0.065 g, 1 yd = 0.9144 m) and a twist number of 0.8 T / 2.54 cm. Next, this roving was finely spun to obtain a double-layer spun yarn of 26th (English cotton count).

  As shown in FIG. 8, the obtained multi-layer spun yarn is a multi-layer spun yarn in which polylactic acid fibers are arranged as a core component, hollow polyester short fibers are arranged as an inner portion, and cotton is arranged as an outer portion. It was.

Next, bag knitting was knitted using this double-layer spun yarn with a double-sided circular knitting machine having a hook diameter of 76 cm and a needle density of 24 / 2.54 cm. Then, using a pin tenter, it was preset at 170 ° C. for 2 minutes, and alkali-treated in a sodium hydroxide aqueous solution having a concentration of 20 g / L at a bath ratio of 1:20 at 97 ° C. for 30 minutes. Then, after dyeing | staining for 130 degreeC x 60 minutes using a disperse dye, it dye | stained for 80 degreeC x 60 minutes using the reactive dye. Further, after performing the softening treatment, final setting was performed at 160 ° C. for 2 minutes using a pin tenter to obtain the hollow spun yarn knitted fabric of the present invention.
The hollow spun yarn contained in this hollow spun yarn knitted fabric had a cross-sectional shape as shown in FIG. 6, and the hollow ratio of the hollow spun yarn was 15%.

(Comparative Example 1)
A comparative woven or knitted fabric was obtained in the same manner as in Example 1 except that ordinary polyester fiber (solid yarn, 1.4 dtex × 38 mm) was used instead of the polylactic acid fiber.

  The hollow spun yarn knitted fabric of the present invention (Examples 1 and 2) was excellent in lightness, bulkiness, heat retention and quick drying.

  On the other hand, about the comparative example 1, since the multi-layer spun yarn which does not have a hollow part is used, it became inferior to lightness and heat retention.

It is a figure which shows the cross-sectional shape of the single hole type | formula hollow spun yarn which can be used for this invention. It is a figure which shows the cross-sectional shape of the 2-hole type hollow spun yarn which can be used for this invention. It is a figure which shows the cross-sectional shape of this multilayered spun yarn in which the polylactic acid type fiber which can be used for this invention was arranged by single core. It is a figure which shows the cross-sectional shape of the multilayered spun yarn in which the polylactic acid type fiber which can be used for this invention was distribute | arranged to 2 cores. It is a figure which shows the cross-sectional shape of the single hole type hollow spun yarn which arrange | positions a cellulosic fiber on the outer side and arrange | positions the polyester short fiber on the inner side which can be preferably used for this invention. It is a figure which shows the cross-sectional shape of the single hole type hollow spun yarn which arrange | positions a cellulosic fiber outside and can arrange | position a hollow polyester short fiber inside, which can be preferably used for this invention. A multi-layer spinning which can be preferably used in the present invention, comprising a polylactic acid fiber as a core component in a single core, a cellulose fiber as an inner portion and a polyester short fiber as an outer portion as a sheath component It is a figure which shows the cross-sectional shape of a thread | yarn. A multi-layer comprising polylactic acid fibers as a core component, which can be preferably used in the present invention, a cellulosic fiber as an inner portion and a hollow polyester short fiber as an outer portion as a sheath component It is a figure which shows the cross-sectional shape of a spun yarn. 1 is a schematic plan view showing an example of a roving machine for producing a roving of a multi-layer spun yarn that can be used in the present invention. 1 is a schematic plan view showing an example of a roving machine for producing a roving of a multi-layer spun yarn that can be used in the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fiber of sheath component 2 Polylactic acid fiber 3 Cellulose fiber 4 Polyester short fiber 5 Hollow polyester short fiber 6 Back roller 7 Apron 8 Second roller 9 Front roller 10 Fiber bundle 11 Flyer head SA Sliver made of polylactic acid fiber SB sheath Sliver consisting of the fibers of the component SB1 Sliver consisting of the fibers of the inner portion of the sheath component SB2 Sliver consisting of the fibers of the outer portion of the sheath component

Claims (7)

  Woven knitted fabric mainly composed of hollow spun yarn, the hollow spun yarn obtained by dissolving and removing the polylactic acid fiber from a multi-layer spun yarn comprising polylactic acid fiber as a core component A hollow spun yarn knitted fabric characterized by   2. The hollow spun yarn knitted fabric according to claim 1, wherein the multi-layer spun yarn is formed by arranging the polylactic acid fibers in a multi-core manner.   The hollow spun yarn knitted or knitted fabric according to claim 1 or 2, wherein the multi-layer spun yarn comprises cellulose fibers as a sheath component.   The hollow spun yarn knitted fabric according to any one of claims 1 to 3, wherein the multi-layer spun yarn includes polyester short fibers as a sheath component.   The hollow spun yarn knitted fabric according to claim 4, wherein the polyester short fibers are hollow fibers.   The hollow spun yarn knitted or knitted fabric according to claim 4 or 5, wherein the multi-layer spun yarn is formed by disposing a cellulosic fiber in an outer portion as a sheath component and a polyester short fiber in an inner portion. The method for producing a hollow spun yarn knitted fabric according to any one of claims 1 to 6, wherein the yarn is woven and knitted using a multi-layer spun yarn having a polylactic acid fiber as a core component, and then subjected to alkali treatment. .