WO2020170469A1 - Spun yarn, method for producing same, and cloth comprising same - Google Patents

Abstract

The present invention relates to a spun yarn comprising a polypropylene-based fiber and a cellulose-based fiber, wherein the spun yarn contains the polypropylene-based fiber and the cellulose-based fiber in amounts of 20 to 80% by mass and 20 to 80% by mass, respectively, and the spun yarn has a twist factor of 2.4 to 6.0 and a twist angle of 21.5° or more. The spun yarn can be produced by: providing two crude yarns in such a manner that the contents of the polypropylene-based fiber and the cellulose-based fiber in the two crude yarns can become 20 to 80% by mass and 20 to 80% by mass, respectively, relative to the whole mass, i.e., 100% by mass, of the two crude yarns in ring spinning; feeding the two crude yarns to a draft zone to draft the two crude yarns; feeding the two crude yarns to a twisting zone while paralleling the two crude yarns; and spinning the two crude yarns. It is possible to provide: a spun yarn which enables the production of a cloth having high water-absorbing and quick-drying performance and having improved anti-pilling properties; a method for producing the spun yarn; and a cloth comprising the spun yarn.

Description

Spun yarn, method for producing the same, and fabric containing the same

The present invention relates to a spun yarn containing a polypropylene fiber and a cellulose fiber, a method for producing the spun yarn, and a cloth including the spun yarn.

Conventionally, as a spun yarn having a water-absorbing and quick-drying property, a spun yarn in which a water-absorbent fiber and a water-repellent fiber are used in combination has been proposed. For example, Patent Document 1 describes a multi-layered yarn in which fibers that mainly absorb water are arranged in the inner layer portion, and fibers that mainly exhibit water repellency are arranged in the outer layer portion. In Patent Document 2, in a spun yarn composed of a fiber bundle A exhibiting water repellency and a fiber bundle B exhibiting water absorbency, a fiber bundle A having a twist angle larger than that of the fiber bundle B is wound around the fiber bundle B. The spun yarn is described. Patent Document 3 describes a mixed yarn containing a non-hygroscopic fiber and a hygroscopic fiber. Patent Document 4 describes a yarn composed of a hydrophobic fiber and a hydrophilic fiber.

Japanese Patent Laid-Open No. 04-091240 Japanese Patent Laid-Open No. 05-033234 JP-A-63-42929 Japanese Patent Publication No. 2001-505628

However, Patent Documents 1 to 4 do not consider improving the anti-pilling property of a fabric using a spun yarn having a water-absorbing and quick-drying property.

In order to solve the above-mentioned conventional problems, the present invention provides a spun yarn having a high water-absorbing quick-drying property and an improved pilling resistance, a method for producing the spun yarn, and a fabric including the spun yarn.

The present invention relates to a spun yarn containing polypropylene-based fibers and cellulose-based fibers, wherein the spun yarn contains 20 to 80% by mass of polypropylene-based fibers and 20 to 80% by mass of cellulose-based fibers. And a twist coefficient of 2.4 to 6.0, and a twist angle of 21.5° or more.

The present invention is also the above-mentioned method for producing a spun yarn, wherein in the ring spinning, when the total mass of the two rovings is 100% by mass, the content of the polypropylene fiber in the two rovings is Is 20 to 80% by mass and the content of the cellulosic fiber is 20 to 80% by mass. A step of preparing two roving yarns, after feeding the two roving yarns to the draft zone and drafting, The present invention relates to a method for producing a spun yarn, including a step of supplying the twisted yarn to the twisted yarn zone while aligning the yarn, and a step of twisting the yarn.

The present invention also relates to a fabric including the spun yarn described above.

The present invention can provide a spun yarn that has a high water-absorbing quick-drying property and a fabric with an improved anti-pilling property, and a fabric with a high water-absorbing quick-drying property and an improved anti-pilling property. Further, according to the present invention, it is possible to obtain a spun yarn that has a high water-absorbing and quick-drying property and can obtain a fabric with improved pilling resistance.

FIG. 1 is a partial perspective view of an example ring spinning machine used in one embodiment of the present invention. FIG. 2 is a partial perspective view of an example ring spinning machine used in another embodiment of the present invention. FIG. 3 is a schematic explanatory view of an example of an extruder used in one embodiment of the present invention. FIG. 4 is a side view photograph of the spun yarn illustrating the twist angle of the spun yarn. FIG. 5 is a side view photograph of the spun yarn illustrating the diameter of the spun yarn. FIG. 6 is a side view photograph (magnification: 100 times) of the spun yarn in one embodiment (Example 1) of the present invention. FIG. 7 is a cross-sectional photograph (magnification: 270 times) of a spun yarn in one embodiment (Example 1) of the present invention.

The inventors of the present invention diligently studied to improve the anti-pilling property while maintaining the high water-absorbing and quick-drying properties of the fabric using the spun yarn in which the water-absorbing fiber and the water-repellent fiber are used in combination. .. As a result, the spun yarn contains a predetermined amount of polypropylene-based fibers and cellulose-based fibers, and the twist coefficient and the twist angle of the spun yarn are set within a predetermined range, so that the fabric using the spun yarn has a high water-absorbing and quick-drying property. It was found that it has heat retention and anti-pilling properties are improved.

Examples of the cellulosic fibers include natural fibers such as cotton, hemp, and pulp, viscose rayon, cupra, solvent-spun cellulose fibers, regenerated fibers such as polynosic, and semisynthetic fibers such as acetate. Among them, cotton is preferable from the viewpoint of excellent texture and durability. In the case of cotton, the average fiber length is preferably 25 to 45 mm, more preferably 26 to 33 mm. The average fineness is preferably 2.8 to 5.5 micronaire (1.1 to 2.2 dtex), and more preferably 3.5 to 4.9 micronaire (1.3 to 1.9 dtex). ..

The polypropylene fiber is not particularly limited, and a fiber containing polypropylene may be used. The polypropylene may be a homopolymer of propylene or a copolymer containing propylene and a component copolymerizable therewith, in which the content of propylene exceeds 50 mol %. The component copolymerizable with propylene is not particularly limited, but examples thereof include olefin-based monomers such as ethylene, butene, and methylpentene. Polypropylene is preferably a propylene homopolymer. The said polypropylene may be used individually by 1 type, and may be used in combination of 2 or more type.

From the viewpoint of spinnability, the polypropylene has a melt mass flow rate (MFR) of preferably 5 to 60 g/10 min, more preferably 7 to 45 g/10 min, further preferably 10 to 30 g/10 min. preferable. In the present specification, the MFR of polypropylene is measured according to ISO1133 at 230° C. under a load of 2.16 kg.

The polypropylene fiber can be manufactured by a conventional method. For example, polypropylene or a resin composition containing polypropylene is melt-spun to form an unstretched yarn using a spinneret, the obtained unstretched yarn is stretched, and a fiber treatment agent (also referred to as an oil agent) is applied thereto, It can be obtained by crimping with a crimper and drying.

The polypropylene-based fiber may be a single component fiber of polypropylene, or may be a composite fiber of polypropylenes or a composite fiber of polypropylene and another resin. In the case of coloring polypropylene fibers, the pigment may be mixed with polypropylene or may be mixed with a component that is easily dyed to form a single type. It may be shaped.

The fiber cross-sectional shape of the polypropylene fiber is not particularly limited, and may be circular or non-circular (so-called irregular cross section).

The above fiber treatment agent is preferably a hydrophilic oil agent. By adding the hydrophilic oil agent, static electricity is suppressed and the productivity in the spinning process tends to be improved.

The polypropylene fiber may include a hydrophilic component. Usually, the polypropylene-based fiber containing no hydrophilic component has a water content of less than 0.15% by mass, but the hydrophilic polypropylene-based fiber containing the hydrophilic component has a water content of 0.15% by mass or more. Fibers can be obtained. Here, the moisture content is measured according to JIS L 1015 (2010).

The hydrophilic component is not particularly limited as long as it has water solubility or water dispersibility. Examples of the water-soluble hydrophilic component include ionic surfactants and nonionic surfactants. Among them, nonionic surfactants are preferable. Examples of the ester type nonionic surfactant include glycerin fatty acid ester, sorbitan fatty acid ester and sucrose fatty acid ester, and examples of the ether type nonionic surfactant include polyoxyethylene (POE) alkyl ether and polyoxyethylene ( POE) alkyl phenyl ether, polyoxyethylene polyoxypropylene glycol and the like. Among these, polyoxyethylene alkyl ether or polyoxyalkylene derivative (both compounds are, for example, Kao Corporation, trade name "Emulgen") is preferable.

The water-soluble hydrophilic component preferably has a molecular weight of 200 to 5,000, more preferably 300 to 3,000. When a hydrophilic surfactant is used alone as the water-soluble hydrophilic component, the molecular weight of the hydrophilic surfactant is preferably 1000 or less.

Examples of the water-dispersible hydrophilic component include clay minerals such as kaolinite, smectite, montmorillonite, and bentonite, hydrophilic silica such as fumed silica, colloidal silica, and silica gel, talc, a multilayer structure such as zeolite, or an amorphous inorganic material. Natural polymer polysaccharides such as particles and cellulose, amino polymer polysaccharides such as chitin and chitosan are used. The high molecular polysaccharides may be added as nanofibers. Since clay minerals and nanofibers are added as solids, they also have an effect as a water retention agent. The average particle diameter of the inorganic particles is preferably as small as possible, and is preferably 100 nm or less. In addition, the average particle diameter is measured by a phase drip method particle diameter measuring device.

The hydrophilic polypropylene fiber can be obtained by melt spinning a polypropylene resin composition containing polypropylene and a masterbatch resin composition containing a hydrophilic component. The polypropylene-based resin composition preferably contains 1 to 10 parts by mass of the masterbatch resin composition with respect to 100 parts by mass of polypropylene.

The masterbatch resin composition contains polypropylene as a heat-meltable base resin and a hydrophilic component. The masterbatch resin composition preferably contains 1 to 10% by mass of the hydrophilic component, more preferably 2 to 8% by mass of the hydrophilic component. The polypropylene as the base resin may be the same as or different from the polypropylene constituting the polypropylene fibers.

The masterbatch resin composition preferably further contains a compatibilizer. As the compatibilizer, for example, an ethylene-based copolymer containing a polar group (an acid anhydride group) such as an ethylene-acrylic acid (ester) copolymer and an ethylene-acrylic acid (ester)-maleic acid copolymer is preferable. The polar group-containing ethylene-based copolymer is preferable because it has a polar group, so that it has a high affinity with the hydrophilic component and has a relatively lower melting point than polypropylene, so that it is easy to knead. The melting point (DSC method) of the compatibilizer is preferably 70 to 110°C. A more preferable melting point is 80 to 105°C.

The masterbatch resin composition may further include a high MFR polypropylene having a higher MFR than the polypropylene of the base resin, and the MFR of the high MFR polypropylene is preferably 10 times or more higher than the MFR of the base resin. For example, the high MFR polypropylene preferably has an MFR of 100 to 3000 g/10 minutes, more preferably 500 to 2500 g/10 minutes. One type of high MFR polypropylene may be used alone, or two or more types may be used in combination.

The method for producing the masterbatch resin composition includes a primary processing step of melt-kneading a base resin polypropylene and a hydrophilic component, cooling and chipping, and melting the high-MFR polypropylene in the chipped resin composition. It is preferable to include a secondary processing step of kneading, cooling and chipping. The “chip” may be referred to as “pellet”.

In the primary processing step, first, an extruder is used to continuously connect an extruding section to a kneading chamber equipped with a decompression line, and in the kneading chamber, a hydrophilic component (liquid) or water, etc., if necessary. By supplying a hydrophilic component dissolved or dispersed in the solvent of, and polypropylene of the base resin, removing the solvent in a gaseous state from the decompression line simultaneously with mixing, and then extruding the resin composition from the extruding section. A resin composition is obtained. Further, it is preferable to add a compatibilizing agent because the base resin and the hydrophilic component can be efficiently mixed. In addition, in the secondary processing step, it is preferable to add a water retention agent as a solid hydrophilic component among the hydrophilic components in some cases.

The hydrophilic polypropylene fiber can be produced by a conventional method except that a polypropylene resin composition containing polypropylene and a masterbatch resin composition containing a hydrophilic component is used. For example, polypropylene using a spinneret, polypropylene-based resin composition containing a masterbatch resin composition containing a hydrophilic component is melt-spun to an undrawn yarn, the obtained undrawn yarn is drawn, fiber treatment It can be obtained by applying an agent (oil agent), crimping with a crimper, and drying.

Specifically, the hydrophilic polypropylene fiber (undrawn yarn) can be produced as described below.
(1) Base resin polypropylene: hydrophilic component (eg, polyoxyethylene alkyl ether): compatibilizer = 100:2 to 8:2 to 8 (parts by mass) for primary processing (primary processing resin).
(2) As a secondary processing, a processing of primary processed resin: high MFR polypropylene=100:5 to 15 (parts by mass) is performed to obtain a masterbatch resin composition (secondary processed resin).
(3) A polypropylene-based resin composition obtained by mixing the masterbatch resin composition (secondary processed resin) in an amount of about 1 to 10 parts by mass and 100 parts by mass of polypropylene is melt-spun to obtain a hydrophilic polypropylene-based fiber. To get

The hydrophilic polypropylene fiber may be a single component of polypropylene or a composite component of polypropylenes or a composite component of polypropylene and another resin. When coloring hydrophilic polypropylene fibers, the pigment may be mixed with polypropylene or mixed with a component that is easily dyed to form a single type, or combined with a component that is easily dyed to form a core-sheath type. You may make it a shape.

The fiber cross-sectional shape of the hydrophilic polypropylene fiber is not particularly limited, and may be circular or non-circular (so-called irregular cross section).

The single fiber strength of the polypropylene fiber is preferably 1.8 to 9.0 cN/dtex, more preferably 2.0 to 8.0 cN/dtex, and 3.0 to 7.5 cN/dtex. It is more preferable that there is. When the single fiber strength is 1.8 cN/dtex or more, the fiber is hard to be broken even when an external force (for example, spinning tension) when processing the fiber is applied. Further, when the single fiber strength is 9.0 cN/dtex or less, a fiber having better anti-pilling property can be obtained.

The elongation of the polypropylene fiber is preferably 5 to 70%, more preferably 10 to 40%. When the elongation is 5 to 70%, fibers having a soft texture can be obtained.

The spun yarn contains 20 to 80% by mass of polypropylene fibers and 20 to 80% by mass of cellulose fibers. It is possible to improve the water absorption quick-drying property and the anti-pilling property of the fabric. From the viewpoint of further increasing the twist angle of the spun yarn to further enhance the anti-pilling property of the fabric, the spun yarn preferably contains 30 to 80% by mass of polypropylene fiber and 20 to 70% by mass of cellulose fiber, More preferably, it contains 35 to 75% by mass of polypropylene fibers and 25 to 65% by mass of cellulosic fibers. From the standpoint of suppressing the generation of static electricity in the spinning process and, accordingly, improving the productivity of the mixed wadding process and the card process, the spun yarn preferably contains 5% by mass or more of hydrophilic polypropylene fiber. When only the hydrophilic polypropylene fibers are used as the polypropylene fibers, the hydrophilic polypropylene fibers can be used within the above mixing ratio range.

In the spun yarn, as the polypropylene fiber, an ordinary polypropylene fiber having a water content of less than 0.15 mass% and a hydrophilic polypropylene fiber having a water content of 0.15 mass% or more may be used in combination. Good. In that case, in the spun yarn, the ratio of the hydrophilic polypropylene-based fibers to the entire polypropylene-based fibers may be, for example, 5% by mass or more, and is not particularly limited, but from the viewpoint of productivity in the spinning process, hydrophilic polypropylene is used. The proportion of the system fibers is preferably 30% by mass or more, more preferably 50% by mass or more, and particularly preferably 100% by mass.

In the spun yarn, it is preferable that the polypropylene fiber and the cellulose fiber are substantially mixed. Substantially mixed, not only that polypropylene-based fibers and cellulose-based fibers are uniformly mixed, even if there is a polypropylene-based fibers or cellulose-based fibers are unevenly distributed, The thread as a whole also includes a thread having a predetermined content.

The spun yarn may include other fibers in addition to the polypropylene fiber and the cellulose fiber. Other fibers are not particularly limited, and examples thereof include polyolefin fibers other than polypropylene fibers, acrylic fibers, polyester fibers, polyamide fibers, acetate fibers, ethylene vinyl alcohol fibers, urethane fibers, and the like. The spun yarn may appropriately contain other fibers in an amount of 20% by mass or less, 15% by mass or less, 10% by mass or less, or 5% by mass or less, depending on applications and purposes. It is particularly preferable that the spun yarn substantially consists of polypropylene-based fibers and cellulose-based fibers from the viewpoint of further improving water absorption and quick-drying property and anti-pilling property.

The polypropylene fiber and other fibers are not particularly limited, but may have a single fiber fineness of 0.1 to 100 dtex, for example. When the spun yarn is used for clothing, the polypropylene fiber and other fibers have a single fiber fineness of preferably 0.4 to 5 dtex, more preferably 0.5 to 3.5 dtex, and 0 More preferably, it is from 6 to 2.5 dtex.

The polypropylene fiber and other fibers are not particularly limited, but for example, the fiber length is preferably 24 to 75 mm, more preferably 28 to 65 mm, further preferably 32 to 54 mm, and 34 A size of up to 48 mm is particularly preferred. Further, regarding the average fiber length of the polypropylene-based fiber and the cellulose-based fiber, it is preferable that the average fiber length of the polypropylene-based fiber is longer than the average fiber length of the cellulose-based fiber. The structure of the yarn cross section described later is easily obtained, and the pilling resistance tends to be improved.

The twisting coefficient of the spun yarn is 2.4 to 6.0, so that the fabric has good pilling resistance. The twist coefficient is preferably 2.8 to 4.5, and more preferably 3.0 to 4.0, from the viewpoint of the anti-pilling property and the soft touch of the cloth.

The twist angle of the spun yarn is 21.5° or more, preferably 22° or more, so that the anti-pilling property of the fabric can be enhanced regardless of the number of fluffs of the spun yarn. From the viewpoint of further enhancing the anti-pilling property of the fabric, the twist angle is more preferably 23° or more, further preferably 24° or more, and particularly preferably 25° or more. In the spun yarn, the upper limit of the twist angle is not particularly limited, but is preferably 45° or less from the viewpoint of enhancing the knitting property, for example. In the present specification, the twist angle of the spun yarn can be measured as described later.

The spun yarn is not particularly limited, but for example, from the viewpoint of further improving anti-pilling property, the number of fluffs having a length of 3 mm or more is preferably 200 fibers/10 m or less, and more preferably 160 fibers/10 m or less. It is preferably 80 lines/10 m or less. The number of fluffs having a length of 5 mm or more is preferably 40 fibers/10 m or less, more preferably 30 fibers/10 m or less, and further preferably 10 fibers/10 m or less. The number of fluffs having a length of 10 mm or more is preferably 1.5 fibers/10 m or less, more preferably 1 fiber/10 m or less, and further preferably 0 fibers/10 m. In the present specification, the number of fluffs of the spun yarn can be measured as described later.

The spun yarn is not particularly limited, but for example, from the viewpoint of anti-pilling property and soft texture, the porosity is preferably 40 to 80%, more preferably 50 to 80%. In the present specification, the porosity means the ratio of air in the yarn, and as described later, the yarn diameter is calculated from the side observation of the yarn by an electron microscope, and based on the yarn diameter, mass and fiber specific gravity. To calculate.

The count of the spun yarn is not particularly limited, but may be in the range of 5 to 100 S for English cotton count, preferably 10 to 90 S, more preferably 15 to 85 S, and further preferably 20 to It is 80S.

The spun yarn is preferably a twisted yarn composed of two fiber bundles. The fact that the spun yarn is composed of two fiber bundles may be confirmed by unraveling into two fiber bundles when the spun yarn is twisted in the direction opposite to the twisting direction and untwisted. When the twisted yarn is composed of two fiber bundles, when the drafted fiber bundles from each roving yarn are aligned and twisted, each fiber bundle is also subjected to a sweet twist, and the fiber bundles are twisted together. It will be in the state of being. Therefore, the fiber bundle and the fiber bundle are entangled with each other (entanglement of the fiber bundles), the fiber cohesiveness in the yarn cross section is improved, the effect of suppressing fluff and the twist angle can be increased, and the anti-pilling property when formed into a fabric Is significantly improved. The twisted yarn composed of two fiber bundles can be manufactured by silo spinning or silo compact spinning described later. The fiber bundle is preferably a mixture of polypropylene fibers and cellulosic fibers, and a twisted yarn composed of two fiber bundles improves the water absorption and quick-drying property of the cloth. In addition, in the distribution of each fiber in the yarn cross section, by adjusting the material, fineness, fiber length, etc., polypropylene fibers are relatively concentrated in the vicinity of the core of the yarn cross section, and cellulose fibers, such as cotton, are applied to the outer periphery of the yarn cross section. A relatively large amount can be concentrated in the vicinity, and the anti-pilling property tends to be improved, which is preferable. It is presumed that a relatively large amount of the polypropylene fiber is concentrated near the core of the yarn cross section because the fiber length of the polypropylene fiber is longer than that of cotton.

The spinning method of the spun yarn is not particularly limited, but can be produced by performing spinning in the ring method in the following steps. When the total mass of the two rovings is set to 100% by mass in advance, the content of the polypropylene fiber in the two rovings is 20 to 80% by mass, and the content of the cellulosic fiber is 20 to 80% by mass. Thus, a spun yarn can be obtained by preparing two roving yarns as described above, feeding and drafting the two roving yarns to the draft zone, and then feeding them to the twisting zone while aligning and twisting them. The spinning method is referred to as silo spinning, and the spun yarn obtained by the spinning method is also referred to as silo yarn. From the viewpoint of reducing the number of fluffs, when the total mass of the two rovings is set to 100% by mass in advance, the content of polypropylene fibers in the two rovings is 20 to 80% by mass, and Two roving yarns are prepared so that the content is 20 to 80% by mass, the two roving yarns are fed to the draft zone and drafted, and then fed to the twisting yarn zone while being aligned, and then to the twisting yarn zone. It is also possible to obtain a spun yarn by sucking two rovings immediately after being supplied with air in the traveling direction of the rovings to converge the fibers and then twisting the fibers. The spinning method is a method using both silo spinning and compact spinning, and is also called silo compact spinning. The spun yarn obtained by the spinning method is also called silo compact yarn or compact silo yarn. ..

By adjusting the twisting coefficient in the range of 2.4 to 6.0 in silo spinning or silo compact spinning, it is easy to obtain a spun yarn having a twisting angle of 21.5° or more, preferably 22° or more. The anti-pilling property can be enhanced. The twist coefficient is preferably 2.8 to 4.5, and more preferably 3.0 to 4.0, from the viewpoint of enhancing the anti-pilling property and soft feeling of the cloth.

In the two rovings, the content of each fiber of the polypropylene fiber and the cellulosic fiber with respect to the total mass of the two rovings may satisfy the above range, the content of each fiber in each roving is , May be the same or different. For example, if the content of each fiber in the two rovings satisfies the above-mentioned range, one roving is 100% by mass of polypropylene fiber, and the other roving is 100% by mass of cellulosic fiber. It is also possible to use it as%. It is preferable to use a roving prepared by mixing polypropylene fibers and cellulose fibers for both of the two rovings. More preferably, each roving contains 20 to 80% by mass of polypropylene fibers, and a cellulose fiber. 20 to 80% by mass of fibers, more preferably 30 to 80% by mass of polypropylene fibers, and 20 to 70% by mass of cellulosic fibers, and even more preferably 35 to 75% by mass of polypropylene fibers, And 25 to 65% by mass of cellulosic fibers. It is easier to obtain a predetermined twist angle when both polypropylene yarns and cellulose fibers are mixed in both rovings.

In one or more embodiments of the present invention, the fabric comprises the spun yarn described above. The cloth may be knitted or woven. From the viewpoint of enhancing the anti-pilling property, the fabric preferably contains 50% by mass or more of the spun yarn, more preferably 75% by mass or more, further preferably 85% by mass or more, and further preferably 95% by mass or more. It is even more preferable that it is 100% by mass, and it is particularly preferable that it is 100% by mass. The fabric may contain other yarns, for example, other spun yarns and/or filament yarns, in addition to the spun yarns, as long as the effect of the present invention is not impaired. The cloth may have a single-layer structure or may include two or more layers.

In the case of knitting, it may be single-sided plain knitting, single-sided deformation kanogo knitting, mesh knitting, fleece knitting, or double-sided smooth knitting, cardboard knitting, and waffle knitting. .. In the case of double-sided knitting, the spun yarn can be used for the front surface layer and/or the back surface layer. By using the spun yarn for both the front surface layer and the back surface layer, the water absorbing and quick drying property and the heat retaining property are further improved.

Woven fabric may be a single woven fabric such as plain weave, twill weave, satin weave, or double woven fabric.

The cloth may be dyed after the refining process, and may be subjected to water absorption processing, SR (Soil release) processing, antibacterial processing, antistatic processing, etc. at the time of finishing processing.

The above-mentioned cloth has a pilling degree of 3 grade or higher, preferably 3.5 grade or higher, and more preferably 4 grade or higher based on JIS L 1076 A method. Is more preferable.

From the viewpoint of high water-absorbing and quick-drying properties, the fabric has a transpiration rate in the transpiration (II) test (based on BOKEN standard BQE A028) of preferably 25% or more, and 30% or more 20 minutes after the start of the test. Is more preferable. In addition, the fabric is not particularly limited, but from the viewpoint of moisture retention and the like, it is preferable that the transpiration rate in the transpiration (II) test (in accordance with Bauken standard BQE A028) is 70% or less 20 minutes after the start of the test. .. The transpiration (II) test is a test for compositely evaluating both water absorption and quick-drying property, and the transpiration rate is specifically measured as described later.

From the viewpoint of high heat retention, the cloth preferably has a heat retention rate of 22.0% or more, and preferably 25.0% or more, measured by a dry contact method using Thermolabo 2 manufactured by Kato Tech. More preferable. The specific method for measuring the heat retention rate is as described below. The cloth is not particularly limited, but for example, from the viewpoint of ensuring air permeability, it is preferable that the heat retention rate is 80.0% or less.

In the case of knitting the fabric, for example, from the viewpoint of reducing the feeling of dampness, the ventilation resistance is preferably 0.210 kPa·s/m or less, more preferably 0.200 kPa·s/m or less, and 0 It is more preferably not more than 150 kPa·s/m. The cloth is not particularly limited, but preferably has a ventilation resistance of 0.120 kPa·s/m or more from the viewpoint of heat retention.

In the case of knitting, the fabric preferably has a thickness of 0.50 mm or more, and more preferably 0.70 mm or more, from the viewpoint of heat retention. The cloth is not particularly limited, but preferably has a thickness of 4.0 mm or less, for example, from the viewpoint of wearing feeling.

The fabric, when the knitted fabric, for example, from the viewpoint of light weight, it is preferable that a bulk density of 0.200 g / cm ³ or less, more preferably 0.195 g / cm ³ or less, 0.170 g / More preferably, it is not more than cm ³ . The cloth is not particularly limited, but preferably has a bulk density of 0.050 g/cm ³ or more from the viewpoint of ensuring heat retention.

In the case of a knit, the fabric has a basis weight of, for example, 450 g/m ² or less, preferably 400 g/m ² or less, and more preferably 300 g/m ² or less from the viewpoint of wearability such as lightness. Is more preferable, and 200 g/m ² or less is particularly preferable. The fabric is not particularly limited, but preferably has a basis weight of 50 g/m ² or more from the viewpoint of heat retention and the like.

The cloth can be used for clothing, industrial base materials and the like. Examples of clothing include underwear, underwear, shirts, jumpers, sweaters, pants, training wear, tights, bandages, mufflers, hats, gloves, socks and ear pads. Examples of the industrial base material include carpet, bedding, furniture, and the like.

The following will be explained using the drawings.

FIG. 1 is a partial perspective view of an example of a ring spinning machine (for silospinning) used in one embodiment of the present invention. The two roving yarns 1a and 1b are supplied in parallel to a draft zone composed of a back roller 103, a middle roller 104, an apron 105 and a front roller 106 via a guide bar 101 and a trumpet 102, while drafting in parallel. Supply to the twisting zone. The roving yarns 2a and 2b supplied to the twisting zone are twisted through the snail wire 111, the traveler 112 and the ring 113 to obtain a spun yarn (silo yarn) 10.

FIG. 2 is a partial perspective view of an example of a ring spinning machine (for silo compact spinning) used in another embodiment of the present invention. The two roving yarns 11a and 11b are supplied in parallel to a draft zone composed of a back roller 203, a middle roller 204, an apron 205 and a front roller 206 via a guide bar 201 and a trumpet 202, while drafting in parallel. Supply to the twisting zone. The two drafted roving yarns (fiber bundles) 12a and 12b immediately after being supplied to the twisting zone are air-cooled by using a focusing device including an air suction unit 207, a ventilation apron 208, a rotating roller 209, and an auxiliary roller 210. After the fibers are converged by sucking them in the advancing direction of the roving yarn, the spun yarn (silo compact yarn) 20 is obtained by twisting through the snail wire 211, the traveler 212 and the ring 213.

FIG. 3 is a schematic explanatory view of an extruder used in one embodiment of the present invention. The extruder 301 includes a raw material supply port 302, a resin melting section 303, a kneading and dispersing section 304, a decompression line 305, an extruding section 306, and a taking-out section 307. First, a polymer (base resin that can be melted by heating) and a hydrophilic component (liquid) or a hydrophilic component dissolved in water as necessary are supplied from a raw material supply port 302 of the resin melting section 303. Both may be mixed before supply. Next, the mixture is sent to the kneading/dispersing section 304. In the kneading/dispersing section 304, a plurality of kneading plates are rotated, where the polymer and the hydrophilic component dissolved in water are uniformly mixed. Next, water is removed from the depressurization line 305 in the form of water vapor. Next, the resin composition is extruded from the extruding portion 306, cooled, taken out from the taking-out portion 307, and cut into a pelletized resin composition (primary processed resin) by cutting after cooling.

Hereinafter, the present invention will be described in more detail with reference to examples. The present invention is not limited to the examples below.

(Measuring method)
(1) Melt mass flow rate (MFR)
According to ISO1133, it measured at 230 degreeC and a 2.16 kg load.
(2) Moisture content According to JIS L 1015 (2010), it was measured under a standard condition of a temperature of 20° C. and a relative humidity of 65%.
(3) Number of fluff The number was measured according to JIS L 1095 (2010) 9.22.2 B method. F-INDEX TESTER (Shikishima Spinning Co., Ltd.) was used as a fluff tester, and the test conditions were a yarn speed of 30 m/min, a test length of 10 m, and N=30.
(4) English cotton count It was measured according to the cotton count measurement method of JIS L 1095 (2010) 9.4.1 General tex/count of regular spun yarn.
(5) Twisting coefficient The number of twists was measured according to JIS L 1095 (2010) 9.15.1A method, and the twisting coefficient was calculated by the following formula.
Twisting factor = Number of twists per inch of yarn length / √ count (6) Twisting angle (a) Placing the yarn in the horizontal direction and using a KEYENCE electron microscope VE-9800, a side image of the yarn (100 times) Got
(B) The midpoint of the cross-sectional direction of the yarn was obtained at the left end and the right end of the side image of the obtained yarn, and the knotting yarn axis was obtained by a straight line between the two points. The obtained yarn shaft was used as a reference line. For example, in FIG. 4, C and D are the midpoints in the cross-sectional direction of the thread at the left end and the right end of the side surface image of the thread, and Lb is the reference line.
(C) The twist angle was measured by measuring the acute angle formed by the reference line and the fiber on the twisted yarn surface. For example, in FIG. 4, the acute angle α formed by the reference line Lb and the fiber on the yarn surface is the twist angle. The twist angle was calculated at five arbitrarily selected points, and the average value thereof was calculated.
(7) Porosity, apparent density
(I) Calculation of Spun Yarn Diameter from Side Observation of Yarn The side surface of the yarn was photographed with a KEYENCE electron microscope VE-9800 (at a magnification of 40 to 100 times). For example, as shown in FIG. 5, a tangent line is drawn in the longitudinal direction of the yarn with respect to the outermost fiber (hereinafter, outermost fiber) of the yarn at an arbitrary position of the yarn, and the perpendicular line to the tangent line is drawn. It was lowered perpendicular to the central axis (longitudinal direction). It was set as the intersection A of the perpendicular and the outermost fiber constituting the yarn. Further, it was set as an intersection B of the outermost end fibers on the opposite side of the intersection A with the central axis of the yarn sandwiched therebetween. The diameter of the yarn was measured from the distance between AB. Five images at different positions were taken for one sample. For each image, the yarn diameter at five locations was determined and used as the representative value for that image. Furthermore, the average value of five images was determined and used as the representative value of the yarn sample.
(II) Calculation of apparent density of spun yarn Using the spun yarn diameter measured in (I), the weight per unit length was calculated from a positive count (JIS L 1095 9.4.1 positive tex and count). The apparent density of the yarn was defined by dividing the weight per unit length by the volume calculated by approximating the cross section of the yarn to a circle. The smaller the apparent density, the larger the bulk per unit length of yarn.
The cross-section of the thread was embedded in epoxy to preserve the cross-sectional shape, then faced with a glass knife using a microtome (Leica EM UC6) and photographed with a KEYENCE electron microscope VE-9800 (magnification 270 times). ..
(III) Method of calculating porosity The volume Vm of a cylinder having the same specific gravity as the fiber material forming an arbitrary thread and the same weight as the thread was calculated. Further, using the yarn diameter measured in (I), the cross section of the yarn was approximated to a circle, and the yarn volume Vy was calculated. Dividing Vm by Vy and multiplying by 100 gives the volume ratio of the fiber in the yarn. By subtracting this from 100, the porosity, which is the proportion of air in the yarn, is derived. However, the fiber specific gravity described in JIS L 1096:2010 8.11 Apparent specific gravity and pore volume ratio was used for the calculation.
(8) Pilling test Based on JIS L 1076 A method, a pilling test was conducted using an ICI type tester to confirm the degree of pilling.
(9) Fiber physical properties Single fiber strength and elongation were measured according to JIS L 1015.
(10) Unit weight, thickness and bulk density The unit weight and thickness were measured according to JIS L 1096 (2010). The bulk density was calculated based on the basis weight and the thickness.
(11) Productivity of spinning process Each process in the spinning process ((I) blended cotton, (II) card, (III) drawing, (IV) roving, (V) spinning, (VI) winding) The productivity was evaluated according to the following five-stage criteria, and the average score was used as the overall evaluation score.
5: Good 4: Generally good 3: Normal 2: Many troubles 1: Not producible (12) Fabric knitting property The knitting property at the time of fabric production was evaluated according to the following five-stage criteria.
5: Good 4: Generally good 3: Normal 2: Many troubles 1: Not productionable (13) Water absorption and quick drying 20 according to the transpiration (II) test (Boken standard BQE A 028) of the Boken Quality Assessment Organization. The transpiration rate after minutes was calculated. Boken general product standard is 30% or more. The transpiration rate was specifically measured and calculated by the following method.
(A) The mass (W) of a test piece having a diameter of about 9 cm and a petri dish was measured.
(B) 0.1 mL of water was added dropwise to the petri dish, the test piece was placed thereon, and the total mass (W0) was measured.
(C) The sample was left under standard conditions (20° C., 65% RH), the total mass (Wt) was measured every predetermined time, and the transpiration rate (%) after 20 minutes was calculated.
Evaporation rate (%) = [(W0-Wt)/(W0-W)] x 100
(14) Thermal insulation The thermal insulation was evaluated by measuring the thermal insulation rate by the dry contact method using Thermolabo 2 manufactured by Kato Tech. Specifically, in a constant air flow (30 cm/s), the heat dissipation rate (power consumption) of radiating heat from a hot plate set to an environmental temperature +10°C through a test piece (20 x 20 cm) is measured to maintain the heat retention rate. I asked. It is judged that the larger the heat retention rate, the higher the heat retention.
(15) Ventilation resistance Using a KES-F8 breathability tester manufactured by Kato Tech Co., Ltd., a mechanism that sends a constant flow rate air to the sample by the piston motion of the cylinder, discharges it through the air into the atmosphere, and sucks it in 10 seconds. Within, the pressure loss due to the sample was measured using a semiconductor differential pressure gauge.

<Production Example 1 of masterbatch resin composition>
[Primary processing resin]
(1) As a water-soluble hydrophilic component, polyoxyethylene alkyl ether (manufactured by Kao Corporation, Emulgen 1108, 100% by mass of active ingredient, molecular weight 473) was prepared.
(2) As a base resin, polypropylene (MFR 20 g/10 min) pellets (cylindrical shape having a diameter of 2 mm and a height of 2 mm) were prepared.
(3) 80 parts by mass of the base resin pellets from the raw material supply port 302 of the extruder shown in FIG. 3, 12.5 parts by mass of polypropylene containing 4% by mass of polyoxyethylene alkyl ether (MFR 800 g/10 minutes), hydrophilic component 2 0.5 parts by mass and 5 parts by mass of a compatibilizer (ethylene-acrylic acid-maleic acid copolymer (MFR 80 g/10 min (190° C., 2.16 kg), melting point (DSC method) 98° C.)) were supplied.
(4) The processing temperature in the extruder was set to 170 to 190°C. The resin melting section 303 feeds the feed forward along the rotation axis, and the kneading and dispersing section 304 rotates a plurality of kneading plates, where the base resin and the hydrophilic component are uniformly mixed, and then the depressurization line 305. At the same time, water was removed by applying a vacuum (negative pressure) to the.
(5) Next, the resin composition was extruded from the extruding section 306, cooled, and taken out from the take-out port 307.
(6) It was introduced into a pelletizer and pelletized (primarily processed resin). (Primary processing process)
[Secondary processing resin]
(1) Using the extruder, 100 parts by mass of the pelletized resin composition (primary processed resin) obtained in the primary step was added to the low stereoregular polypropylene (MFR 2000 g/10 min as high MFR propylene) (trade name " 10 parts by mass of "Elmodu" S400, manufactured by Idemitsu Kosan Co., Ltd. was mixed and supplied from the raw material supply port 302.
(2) Melt kneading, cooling, and pelletizing with a pelletizer to obtain a cylindrical polypropylene masterbatch resin composition (secondary processed resin) having a diameter of 2 mm and a height of 2 mm.

<Fiber production example 1>
100 parts by mass of polypropylene (MFR 20 g/10 min) pellets (cylindrical shape with a diameter of 2 mm and a height of 2 mm) were supplied from a raw material supply port of an extruder for melt spinning, and the extruder was used with a conventional melt spinning machine. After melt-kneading with, melt spinning was performed. After that, it is stretched using a known stretching machine, and a commonly used hydrophilic fiber treating agent is applied so that the adhesion amount becomes 0.15% by mass, crimping is performed with a crimper, and the monofilament fineness is cut. Was about 1.24 dtex and the fiber length was 38 mm to prepare a polypropylene fiber (hereinafter, also referred to as PP fiber a).

<Fiber production example 2>
100 parts by mass of polypropylene (MFR 20 g/10 min) pellets (cylindrical shape with a diameter of 2 mm and a height of 2 mm) were supplied from a raw material supply port of an extruder for melt spinning, and an extruder was used using a conventional melt spinning machine. After melt-kneading with, melt spinning was performed. Then, using a known stretching machine, stretched, the same hydrophilic fiber treatment agent as in Production Example 1 was applied so that the adhesion amount was 0.15 mass%, crimped with a crimper, and cut, A polypropylene fiber having a single fiber fineness of about 1.30 dtex and a fiber length of 38 mm (hereinafter, also referred to as PP fiber b) was produced.

<Fiber production example 3>
100 parts by mass of polypropylene (MFR 20 g/10 min) pellets (cylindrical shape with a diameter of 2 mm and a height of 2 mm) were supplied from a raw material supply port of an extruder for melt spinning, and an extruder was used using a conventional melt spinning machine. After melt-kneading with, melt spinning was performed. Then, using a known stretching machine, stretched, the same hydrophilic fiber treatment agent as in Production Example 1 was applied so that the adhesion amount was 0.15 mass%, crimped with a crimper, and cut, A polypropylene fiber having a single fiber fineness of about 1.69 dtex and a fiber length of 38 mm (hereinafter, also referred to as PP fiber c) was produced.

<Fiber Production Example 4>
(1) 100 parts by mass of polypropylene (MFR 20 g/10 min) pellets (cylindrical shape having a diameter of 2 mm and a height of 2 mm), and 2 parts by mass of the masterbatch resin composition obtained in Production Example 1 of masterbatch resin composition , 2 parts by mass of carbon black were mixed.
(2) The mixed resin composition (pellets) of (1) is supplied from a raw material supply port of an extruder for melt spinning, melt-kneaded by an extruder using a conventional melt spinning machine, and then melt-spun. did. After that, it is stretched using a known stretching machine, and a commonly used hydrophilic fiber treating agent is applied so that the adhered amount becomes 0.15% by mass, crimping is performed with a crimper, and the monofilament fineness is cut. Was about 1.97 dtex, and the fiber length was 38 mm to prepare a hydrophilic polypropylene fiber (hereinafter, also referred to as hydrophilic PP fiber d).

<Fiber production example 5>
(1) 100 parts by mass of polypropylene (MFR 20 g/10 min) pellets (cylindrical shape having a diameter of 2 mm and a height of 2 mm), and 2 parts by mass of the masterbatch resin composition obtained in Production Example 1 of masterbatch resin composition , 0.4 parts by mass of carbon black and 2.0 parts by mass of phthalocyanine blue were mixed.
(2) The mixed resin composition (pellets) of (1) is supplied from a raw material supply port of an extruder for melt spinning, melt-kneaded by an extruder using a conventional melt spinning machine, and then melt-spun. did. After that, it is stretched using a known stretching machine, and a commonly used hydrophilic fiber treating agent is applied so that the adhered amount becomes 0.15% by mass, crimping is performed with a crimper, and the monofilament fineness is cut. Was about 1.78 dtex, and the fiber length was 38 mm to prepare a hydrophilic polypropylene fiber (hereinafter, also referred to as hydrophilic PP fiber e).

(Example 1)
40 parts by mass of the polypropylene fiber obtained in Production Example 1 of fiber and 60 parts by mass of cotton (Australian cotton) were sequentially added to the blending cotton process, the card process, the kneading process, and the roving process to obtain a 60 gelen/12 yd rough product. I got a thread. Next, using two rovings composed of 40% by mass of the polypropylene fiber and 60% by mass of cotton, a draft of 36 times was imparted by a ring spinning machine, and twisted with a twist coefficient of 3.39. A spun yarn (silo yarn) of the formula cotton count 30s was produced. Specifically, as shown in FIG. 1, roving yarns 1a and 1b composed of two polypropylene-based fibers 40% by mass and cotton 60% by mass are used to guide a back roller 103, a middle roller, and a back roller 103 via a guide bar 101 and a trumpet 102. It is supplied in parallel to a draft zone composed of the roller 104, the apron 105 and the front roller 106, is supplied to the twisting zone while being drafted in parallel, and is twisted through the snail wire 111, the traveler 112 and the ring 113 to form two yarns. A spun yarn (silo yarn) 10 in which the fiber bundles were aligned and twisted was obtained.

Using the spun yarn obtained above, a knitted fabric having a plain weave structure with a basis weight of about 143 g/m ² was knitted using a 28-gauge circular knitting machine.

(Example 2)
40 parts by mass of the polypropylene-based fiber obtained in Production Example 2 of fiber and 60 parts by mass of cotton (Australian cotton) were sequentially added to the blending cotton process, the card process, the kneading process, and the roving process to obtain a 60 gelen/12 yd rough product. I got a thread. Next, using two rovings consisting of 40% by mass of polypropylene fiber and 60% by mass of cotton obtained, a draft of 36 times is applied by a ring spinning machine having a compact spinning system, and the roving is air After the fibers were converged by sucking in the traveling direction, the yarn was twisted with a twist coefficient of 3.41 to produce a spun yarn (silo compact yarn) of English cotton count 30s. Specifically, as shown in FIG. 2, roving yarns 11a and 11b made of two polypropylene-based fibers 40% by mass and cotton 60% by mass are used as a back roller 203 and a middle roller via a guide bar 201 and a trumpet 202. It is supplied in parallel to a draft zone composed of a roller 204, an apron 205, and a front roller 206, is supplied to a twisting yarn zone while drafting in parallel, and two drafted roving yarns (fiber bundles immediately after being supplied to the twisting yarn zone (fiber bundle ) 12a and 12b are sucked with air in the advancing direction of the roving using a focusing device composed of an air suction unit 207, a ventilation apron 208, a rotating roller 209, and an auxiliary roller 210, and then the fibers are converged. A spun yarn (silo compact yarn) 20 in which two fiber bundles were aligned and twisted was obtained by twisting the yarn via the 211, the traveler 212, and the ring 213.

Using the spun yarn obtained above, a 24-gauge circular knitting machine was used to knit a knitted fabric having a plain cloth structure having a basis weight of about 154 g/m ² .

(Example 3)
32 parts by mass of the polypropylene-based fiber obtained in Production Example 3 of fiber, 8 parts by weight of the hydrophilic polypropylene-based fiber obtained in Production Example 4 of fiber and 60 parts by weight of cotton (Australian cotton) are mixed and beaten and carded. Then, they were sequentially put into the drawing step and the roving step to obtain a roving of 60 gellen/12 yd. A spun yarn (silo yarn) was obtained in the same manner as in Example 1 except that the two obtained roving yarns were used.

Using the spun yarn obtained above, a knitted fabric having a plain weave structure having a basis weight of about 148 g/m ² was knitted using a 28 gauge circular knitting machine.

(Example 4)
40 parts by weight of the hydrophilic polypropylene fiber obtained in Production Example 4 of fiber and 60 parts by weight of cotton (Australian cotton) were sequentially added to the blending cotton step, the card step, the drawing step, and the roving step to obtain 60 gelene/12 yd. Of roving was obtained. A spun yarn (silo yarn) was obtained in the same manner as in Example 1 except that the two obtained roving yarns were used.

Using the spun yarn obtained above, a knitted fabric having a plain weave structure having a basis weight of about 147 g/m ² was knitted using a 28-gauge circular knitting machine.

(Example 5)
40 parts by weight of the hydrophilic polypropylene fiber obtained in Production Example 5 of fiber and 60 parts by weight of cotton (Australian cotton) were sequentially added to the blending cotton step, the card step, the drawing step, and the roving step to obtain 60 gelene/12 yd. Of roving was obtained. A spun yarn (silo yarn) was obtained in the same manner as in Example 1 except that the two obtained roving yarns were used.

Using the spun yarn obtained above, a knitted fabric having a plain weave structure having a basis weight of about 148 g/m ² was knitted using a 28 gauge circular knitting machine.

(Comparative Example 1)
Polyethylene was produced in the same manner as in Example 1 except that a commercially available regular polyethylene terephthalate fiber (single fiber fineness: 1.32 dtex, fiber length: 38 mm) was used in place of the polypropylene fiber obtained in Fiber Production Example 1. A spun yarn (silo yarn) composed of 40% by mass of terephthalate fiber and 60% by mass of cotton was produced.

Using the spun yarn obtained above, a 24-gauge circular knitting machine was used to knit a knitted fabric having a plain weave structure having a basis weight of about 137 g/m ² .

(Comparative example 2)
75 parts by mass of the polypropylene-based fiber obtained in Production Example 2 of fiber and 25 parts by mass of cotton (Australian cotton) were sequentially added to the blending cotton process, the card process, the drawing process, and the roving process to obtain a 90 gelen/12 yd rough product. I got a thread. Next, using one roving yarn composed of 75% by mass of the obtained polypropylene fiber and 25% by mass of cotton, a draft of 41.4 times was imparted by a ring spinning machine and twisted with a twisting coefficient of 3.47. A spun yarn (ring yarn) having an English cotton count of about 46 s was produced.

Using the spun yarn obtained above, a 18-gauge circular knitting machine was used to knit a knitted fabric having a plain weave structure having a basis weight of about 135 g/m ² .

(Comparative example 3)
50 parts by mass of the polypropylene-based fiber obtained in Production Example 2 of fiber and 50 parts by mass of cotton (Australian cotton) were sequentially added to the blending cotton process, the card process, the kneading process, and the roving process to obtain a 90 gelen/12 yd rough product. I got a thread. Next, using one roving yarn composed of 50% by mass of polypropylene fiber and 50% by mass of cotton obtained, a draft of 39.6 times was imparted with a ring spinning machine, and twisted with a twist coefficient of 3.80. A spun yarn (ring yarn) having an English cotton count of about 44 s was produced.

Using the spun yarn obtained above, a knitted fabric having a plain weave structure having a basis weight of about 133 g/m ² was knitted using an 18 gauge circular knitting machine.

(Comparative example 4)
25 parts by mass of the polypropylene fiber obtained in Production Example 2 of fibers and 75 parts by mass of cotton (Australian cotton) were sequentially added to the blending cotton process, the card process, the kneading process, and the roving process to obtain a 90 gelen/12 yd rough product. I got a thread. Next, using one roving yarn consisting of 25% by mass of the obtained polypropylene fiber and 75% by mass of cotton, a draft of 40.5 times was imparted by a ring spinning machine and twisted with a twisting factor of 3.38. A spun yarn (ring yarn) having an English cotton count of about 45 s was produced.

Using the spun yarn obtained above, a knitted fabric having a plain weave structure having a basis weight of about 124 g/m ² was knitted using an 18 gauge circular knitting machine.

The pilling test was performed as described above using the knitted fabrics of Examples and Comparative Examples, and the results are shown in Table 1 below. The heat retention properties, water absorption and quick drying properties, ventilation resistance, thickness and bulk density of the knitted fabrics of Examples and Comparative Examples were evaluated as described above, and the results are shown in Table 1 below. Table 1 below also shows the results of the monofilament fineness and moisture content of the fiber, the English cotton count of the spun yarn, the twisting coefficient, the twisting angle, the number of fluffs, the apparent density and the porosity, which were measured as described above. FIG. 6 shows a side photograph (magnification: 100 times) of the spun yarn obtained in Example 1, and FIG. 7 shows a cross-sectional photograph (magnification: 270 times) of the spun yarn. In the distribution of each fiber in the yarn cross section of Example 1, it was confirmed that polypropylene fibers were relatively concentrated near the core of the yarn cross section and cotton was relatively concentrated near the outer periphery of the yarn cross section. did it. Table 1 below also shows the results of the productivity in the spinning process and the knitting property of the fabric. In Table 1 below, PET means polyethylene terephthalate fiber, and “−” means unmeasured.

As can be seen from the results in Table 1 above, the fabric using the spun yarn of the example had grade 3 or more pilling and had good anti-pilling property. On the other hand, the fabric using the silo yarn of Comparative Example 1 having a twist angle of less than 21.5° and the ring yarns of Comparative Examples 2 to 4 had a pilling grade of 1.5 and was inferior in pilling resistance. .. In addition, the fabrics using the spun yarns of the examples were good in water absorption and fast drying and good heat retention.

1a, 1b, 11a, 11b roving 2a, 2b, 12a, 12b drafted roving (fiber bundle)
10, 20 Spun yarn 101, 201 Guide bar 102, 202 Trumpet 103, 203 Back roller 104, 204 Middle roller 105, 205 Apron 106, 206 Front roller 207 Air suction part 208 Ventilation apron 209 Rotating roller 210 Auxiliary roller 111, 211 Snail Wires 112, 212 Traveler 113, 213 Ring 301 Extruder 302 Raw material supply port 303 Resin melting part 304 Kneading dispersion part 305 Decompression line 306 Extrusion part 307 Extraction part

Claims (10)

1. A spun yarn containing polypropylene fiber and cellulose fiber,
   The spun yarn contains 20 to 80% by mass of polypropylene fibers and 20 to 80% by mass of cellulose fibers,
   The spun yarn has a twist coefficient of 2.4 to 6.0 and a twist angle of 21.5° or more.
2. The spun yarn according to claim 1, wherein the spun yarn has a twist angle of 22° or more.
3. The spun yarn according to claim 1 or 2, wherein the spun yarn has a twist angle of 25° or more.
4. The spun yarn according to any one of claims 1 to 3, which contains 5% by mass or more of hydrophilic polypropylene fiber having a water content of 0.15% by mass or more measured according to JIS L 1015 (2010).
5. The spun yarn according to any one of claims 1 to 4, wherein the polypropylene fiber and the cellulose fiber are substantially mixed.
6. The spun yarn according to any one of claims 1 to 5, wherein the cellulosic fiber is cotton.
7. A method for producing a spun yarn according to any one of claims 1 to 6,
   In ring spinning,
   When the total mass of the two rovings is 100% by mass, the content of polypropylene fibers in the two rovings is 20 to 80% by mass, and the content of cellulose fibers is 20 to 80% by mass. The process of preparing two rovings,
   Supplying the two rovings to the draft zone, drafting them, and then supplying them to the twisting zone while aligning, and
   A method for producing a spun yarn, which comprises the step of twisting.
8. The method for producing a spun yarn according to claim 7, wherein the two roving yarns immediately after being supplied to the twisting yarn zone are sucked with air in the advancing direction of the roving yarns to converge the fibers and then twisted.
9. A fabric comprising the spun yarn according to any one of claims 1 to 6.
10. The cloth according to claim 9, wherein the cloth has an anti-pilling property of grade 3 or higher.

Images