JP5578185B2 - Cotton blended cotton - Google Patents

Description

  The present invention is rich in texture, excellent in heat retention, easy to follow the body, excellent in bulkiness, excellent in bulkiness recovery after long-term compression, etc., and blended cotton suitably used for applications such as comforters and down jackets The present invention relates to stuffed cotton and mixed raw cotton for stuffed cotton.

  Conventionally, feathers excellent in heat retention and bulkiness have been used as a kind of stuffed cotton for bedding such as comforters and pillows.

  It is known that duvets using feathers as stuffed cotton are rich in texture, light in weight, excellent in heat retention, easy to follow the body, excellent in bulkiness, and have a high recovery rate. The feathers used in this duvet are generally waterfowl feathers. However, when trying to obtain natural feathers, the supply amount is limited, and there is a problem that the supply amount fluctuates due to the influence of natural conditions and epidemics. Furthermore, there are limits to capturing wild birds from a conservation perspective. Also, when trying to obtain feathers by breeding waterfowls, many waterfowls must be reared, and as a result, not only a large amount of feed is required, but also water pollution and infectious diseases caused by waterfowl excreta The problem of occurrence and diffusion has arisen. In addition, in order to be able to use feathers as stuffed cotton, it is necessary to go through many processes such as hair collection, selection, disinfection, degreasing, and stuffing, and the work is also complicated in that the feathers soar As a result, the price of bedding using feathers tends to increase. Furthermore, flesh remains at the end of the feathers at the time of hair collection, causing rotting odors, and in Europe and the like, movements to eliminate feathers from the viewpoint of animal welfare are also taking place.

  Moreover, although cotton is also used as the material for the stuffed cotton, there is a problem that the cotton is heavy, not bulky, difficult to follow the body, and has a low recovery rate after compression.

  Furthermore, polyester raw cotton is also used as a material for stuffed cotton. However, although this polyester raw cotton is inexpensive, lightweight and excellent in bulkiness, it has a problem that it is difficult to follow the body and the recovery rate after compression is low.

  Therefore, attempts have been made to impart feather characteristics to synthetic fiber raw cotton. For example, a futon containing stuffed cotton in which irregularly shaped fibers and hollow fibers are mixed has been proposed (see Patent Document 1). Further, padding made of two or more types of fibers having different single fiber fineness has been proposed (see Patent Documents 2 and 3). Further, a cotton pad made of a fiber composed of hollow thick short fibers and fine fine fibers having different single fiber fineness and provided with an oil agent containing polyxylosan has been proposed (see Patent Document 4).

  However, the stuffed cotton proposed in the above-mentioned Patent Document 1 in which the modified cross-section fibers and the hollow fibers are mixed can be bulky by mixing the modified cross-section fibers, but is excellent as a feather. High heat retention and compression recovery cannot be obtained. This is because the fiber surface characteristics are not taken into consideration, or fibers with a fine single fiber fineness are not used, even though the bulk can be increased by making the fiber into an irregular cross section.

  Further, in the above-mentioned Patent Document 2, since only a thin fiber layer (fiber web) with a single fiber fineness and a thick fiber layer (fiber web) with a single fiber fineness are laminated, it is excellent as a feather. It cannot be compressed. In addition, since fibers having different fineness are not intertwined, even if two kinds of fibers having different fineness are used, there is almost no effect of increasing bulkiness.

  Moreover, in said patent document 3, although the stuffed cotton with high bulkiness is obtained by using two types of fibers with a large single fiber fineness, since the fiber with a thin single fiber fineness is not used, it is like a feather. Excellent heat retention and compressibility cannot be obtained.

  Furthermore, the stuffed cotton proposed in the above-mentioned Patent Document 4 is composed of hollow thick short fibers and fine fine short fibers having different single fiber fineness, and is provided with an oil agent containing polyxylosan, which is rich in texture and bulky. However, when compressed, the fibers are too entangled to form a felt shape, so that the compression recovery rate and heat retention could not be sufficiently improved.

  In the prior art as described above, bulkiness is improved by entanglement of short fibers of fineness and thickness, or by using irregular cross-section fibers, hollow fibers, and self-crimping irregular cross-section fibers. The recoverability was still inadequate and did not have excellent properties to replace feathers.

Japanese Patent Publication No. 63-23796 Japanese Examined Patent Publication No. 63-23797 Japanese Patent Laid-Open No. 11-346891 JP 2006-115987 A

  Therefore, the object of the present invention is to solve the above-mentioned problems in the prior art and has not only excellent bulkiness, but also a soft and rich texture similar to feathers, lightweight and easy to follow the body, excellent in heat retention and long-lasting. Packed cotton with high bulk recovery after compression, antibacterial, antifungal, antiviral, deodorant or deodorizing performance, and suitable for bedding such as comforters and clothing such as down jackets The object is to provide stuffed cotton that can be manufactured.

The mixed cotton stuffed cotton of the present invention has a single fiber fineness of 10-50% by mass (excluding multilobal cross-section fibers) having a mechanical crimp of a single fiber fineness of 0.5-3.0 dtex, and a single fiber fineness of 0.1%. 10-50% by mass of multileaf thin short fibers B having a mechanical crimp of 5 to 3.0 dtex, and hollow thick and short having a structural difference crimp and / or a mechanical crimp of a single fiber fineness of 5.0 to 20.0 dtex A mixed cotton stuffed cotton, characterized in that 40 to 80% by mass of fibers C are mixed.

  According to a preferred aspect of the mixed cotton-stuffed cotton of the present invention, an oil agent comprising polysiloxane in at least one of the above-described fine short fibers A, multileaf thin short fibers B, and hollow thick short fibers C is 0.1 to It is adhering in the range of 3% by mass.

  According to a preferable aspect of the mixed cotton stuffed cotton of the present invention, the inter-fiber friction coefficient μS of the short fiber to which the oil agent containing the polysiloxane is attached is 0.2 or less.

According to a preferred aspect of the mixed cotton-stuffed cotton of the present invention, the degree of irregularity of the multileaf thin short fiber B is 2.0 to 4.0.

  According to a preferred aspect of the mixed cotton-stuffed cotton of the present invention, the hollow ratio of the hollow thick short fibers C is 20 to 50%.

  According to a preferred aspect of the mixed cotton stuffed cotton of the present invention, the short fiber A, the multileaf thin short fiber B and the hollow thick short fiber C are made of a polymer having an intrinsic viscosity (IV) of 0.62 to 0.75. It will be.

  According to the present invention, it has excellent bulkiness, is soft and rich in texture similar to feathers, is lightweight and easy to follow along with the body, has excellent heat retention, has high bulk recovery properties after long-term compression, and further has antibacterial and antibacterial properties. A stuffed cotton having mold, antiviral, deodorant or deodorizing performance and capable of producing a stuffed cotton suitable for bedding such as a comforter and clothing such as a down jacket is obtained.

The mixed cotton stuffed cotton of the present invention has a single fiber fineness of 10 to 50% by mass of fine fibers A (excluding multileaf fibers) having a mechanical crimp of a single fiber fineness of 0.5 to 3.0 dtex. 10 to 50% by mass of multileaf thin short fiber B having a mechanical crimp of 5 to 3.0 dtex, and a structural difference crimp and / or a mechanical crimp of 5.0 to 20.0 dtex of single fiber fineness This is a mixed cotton stuffed cotton containing 40 to 80% by mass of hollow thick and short fibers C and being mixed so that these are 100% by mass in total.

  In order to increase the bulkiness of the mixed cotton stuffed cotton of the present invention and to prevent settling due to use, it is necessary to increase the rigidity by mixing cotton with a thick single fiber fineness (hollow thick short fiber C). .

  The heat retention of the stuffed cotton is held by an air layer that is excellent in fine heat insulation formed by the fibers constituting it, so in order to improve the heat retention, the number of fine air layers is formed more. It is necessary. In addition, when settling occurs due to use, the fine air layer is reduced and the heat retention is deteriorated, so that it is necessary to mix fibers having a large single fiber fineness as well as bulkiness.

  In order to improve the compressibility and recoverability of stuffed cotton, and to enrich the texture and softness, blend fine fibers with a single fiber fineness to form a fine air layer, and use polysiloxane on the fiber surface. It is necessary to improve smoothness by applying an oil agent to be included, to reduce friction between fibers to facilitate movement, and to prevent felting due to entanglement of fibers during compression.

  The hollow thick short fiber C, which is a mixed raw cotton for mixed cotton stuffing of the present invention, has a high single fiber fineness and thus has a high rigidity, contributes to bulkiness, and prevents the settling due to use and the decrease in heat retention due to settling.

  A fine air layer is formed by blending the short fibers A, which are fine fibers having a single fiber fineness, and the resilience, softness and texture resembling feathers are added.

  Furthermore, by blending the multi-leaf thin short fibers B, the fine air layer in the stuffed cotton is increased by the multi-leaf, improving the heat retention and compressibility, and further, the fibers when compressed are entangled too much It is possible to obtain a characteristic close to feathers, which prevents felting due to, and has high bulk recovery after long-term compression.

  The single fiber fineness of the short and short fibers A used in the present invention is 0.5 to 3.0 dtex, preferably 0.5 to 2.0 dtex, more preferably 0.5 to 1.4 dtex. The mass ratio of the short and short fibers A is 10 to 50% by mass, preferably 10 to 30% by mass.

  Moreover, the single fiber fineness of the multileaf thin short fiber B is 0.5-3.0 dtex, Preferably it is 0.5-2.0 dtex, More preferably, it is 1.0-2.0 dtex. Moreover, the mass ratio of the multileaf thin short fiber B is 10-50 mass%, Preferably it is 10-30 mass%.

  Moreover, the single fiber fineness of the hollow thick short fiber C is 5.0-20.0 dtex, Preferably it is 5.0-10.0 dtex, More preferably, it is 5.0-8.0 dtex. Moreover, the mass ratio of the hollow thick short fiber C is 40 to 80% by mass, and preferably 60 to 80% by mass.

  The single fiber fineness is measured according to JIS L1015 (1999).

  When the mixed cotton stuffed cotton of the present invention is composed of three types of short fibers, ie, the short staple fiber A, the multileaf thin staple fiber B, and the hollow thick staple fiber C, their total mass is usually 100% by mass. The mixed cotton stuffed cotton of the present invention does not block other fibers from being mixed.

The short fiber A used in the present invention has the above-mentioned single fiber fineness of 0.5 to 3.0 dtex, and the cross section may be a round cross section or an irregular cross section (excluding multi-leaf cross section fibers) , preferably It is a round cross section. In addition, the multileaf thin short fiber B also has the above-mentioned single fiber fineness of 0.5 to 3.0 dtex, and its cross section may be any number, but preferably about 2 to 10 leaves, more preferably 3 to 6 It is a leaf. Further, the hollow thick and short fibers C have the above-mentioned single fiber fineness of 5.0 to 20.0 dtex, and the cross section thereof may be a round cross section or an irregular cross section.

  Further, the length of the short fibers A is preferably 10 to 60 mm, more preferably 30 to 50 mm, and the length of the multileaf thin fibers B is preferably 10 to 60 mm, more preferably. The length of the hollow thick short fiber C is preferably 30 to 90 mm, and more preferably 50 to 80 mm.

  In the short staple fiber A, the multileaf thin short fiber B and the hollow thick short fiber C which are the raw cotton for stuffing cotton of the present invention, the polysiloxane is preferably 0 in terms of the mass ratio of the fibers in order to enhance the slipperiness between the fibers. 1 to 3% by mass. The adhesion amount is more preferably 0.3 to 1% by mass, whereby the slipping property between the fibers is high, and the recovery rate after compressing the stuffed cotton becomes high.

  As polysiloxane, for example, amino-modified silicon can be used. In order to adhere the polysiloxane to the fiber, an oil containing polysiloxane may be applied. In addition to polysiloxane, the oil preferably contains a phosphate compound, an aliphatic compound, and a halogen compound, and further preferably contains an antioxidant, a flame retardant, and an antistatic agent. .

  The oil containing polysiloxane is preferably applied immediately before cutting the tow in the step of producing the short fiber used in the present invention, but the oil is applied to the short fiber (raw cotton) after cutting the tow. And may be dried. In applying the oil agent, the concentration of polysiloxane is preferably 1 to 10% by mass, more preferably 1 to 8% by mass, and an oil agent aqueous solution is applied to the fiber and then dried at an arbitrary temperature.

  In the mixed cotton stuffed cotton of the present invention, the interfiber friction coefficient μS of the short fiber to which the polysiloxane is adhered is preferably 0.2 or less, and more preferably 0.1 or less. This is because the slipperiness between the fibers becomes high, and the fibers easily move when the mixed cotton stuffed cotton is compressed, so that the fibers are easily compressed. The inter-fiber friction coefficient μS is measured according to JIS L 1015 (1999).

  In the mixed cotton stuffed cotton of the present invention, it is necessary that the mixing ratio of the short staple fiber A, the multileaf thin staple fiber B, and the hollow thick staple fiber C be within the above-mentioned specific ratio range, thereby filling the stuffed cotton. The softness, texture, and heat retaining properties of the product are improved, and the bulkiness is maintained.

In the mixed raw cotton for stuffed cotton of the present invention, the multifilamentary short fiber B, which is the mixed raw cotton for stuffed cotton used in the present invention, has an irregularity of 2.0 in order to improve the heat retention and recovery of the stuffed cotton. It is preferably ~ 4.0. When the irregularity of the multileaf thin short fiber B is 2.0 or less, the effect of contributing to the formation of a fine air layer in the blended cotton-filled cotton is low. When it is done, the leaf may break. A more preferable variant is 2.0 to 3.0.

The irregularity can be obtained by the following equation by measuring the diameter of the inscribed circle and the diameter of the circumscribed circle from the fiber cross section.
・ Deformity = circumscribed circle / inscribed circle.

  In the present invention, multi-leaf generally refers to a shape having a plurality of convex portions toward the outside from the fiber center in the fiber cross section. The shape of the convex portion may be rounded or may be angular such as a polygon. The number of convex portions may be any number, but is preferably about 2 to 10, more preferably 3 to 6.

  In order to increase the bulkiness of the mixed cotton stuffed cotton, the hollow thick short fiber C, which is a mixed raw cotton for stuffing cotton used in the present invention, preferably has a hollow ratio of 20 to 50%, more preferably 30 to 50%. It is. The hollow ratio can be expressed in% by calculating the ratio of the area of the hollow part to the total area of the fiber cross section including the hollow part from the enlarged photograph of the fiber cross section.

  In the present invention, “hollow” means having a hollow portion inside the outer shape of the fiber in the cross section of the fiber. The cavity may be located at the center of the fiber or may be decentered from the center, but is preferably located at the center of the fiber. Furthermore, the cross-sectional shape of the cavity may be any shape such as a round shape or a polygonal shape, but a round shape is preferred.

  Furthermore, the hollow thick short fiber C used in the present invention is a hollow fiber having an asymmetric structure by one side (one side) rapid cooling during spinning, or a hollow fiber having a side-by-side structure composed of at least two kinds of polymers. Thus, hollow fibers in which the fibers are self-crimped can also be used. If it does in this way, crimpability will be improved more, the repulsion between fibers will become stronger, and bulkiness can be made higher.

  Moreover, it is preferable that all the short fiber A, the multileaf thin short fiber B, and the hollow thick short fiber C which comprise the mixed cotton stuffing cotton of this invention are the fibers which consist of polyester.

  Examples of the polyester used include polyethylene terephthalate, polybutylene terephthalate, polypropylene terephthalate, and copolymers thereof. A particularly preferred polyester is polyethylene terephthalate.

  As the polymer other than polyester, aliphatic polyamide, polyolefin, polyphenylene sulfide, and the like can be used. For example, polycoupleramide (nylon 6), polyhexamethylene adipamide (nylon 66), polytetramethylene adipamide ( Nylon 46), polyundecanamide (nylon 11), polylauractamide (nylon 12) and copolymers thereof, polypropylene, polyethylene and the like.

  Moreover, in order to reduce the environmental burden at the time of disposal, fibers made of biodegradable polymers can be used. Examples of biodegradable polymers include polylactic acid, polyethylene succinate, polybutylene succinate, polybutylene succinate adipate, polybutylene succinate carbonate, polybutylene adipate terephthalate and polyethylene terephthalate succinate or copolymers thereof. Is mentioned. The biodegradable copolymer other than these may be, for example, a polyesteramide copolymer or a copolymer obtained by modifying an aromatic polyester so as to have biodegradability.

  In producing the short fiber A, the multileaf thin short fiber B and the hollow thick short fiber C, the optimum intrinsic viscosity (IV: measured at a temperature of 25 ° C. using an orthochlorophenol solvent) of the polymer used is: It is 0.62-0.75, More preferably, it is 0.64-0.72. If the intrinsic viscosity is lower than 0.62, the fiber has low rigidity and is inferior in bulkiness. On the other hand, when the intrinsic viscosity is higher than 0.75, it becomes difficult to produce the yarn.

  In addition, the short staple fiber A, the multileaf thin short fiber B, and the hollow thick short fiber C are usually ordinary thermoplastic short fibers such as polyester if conditions such as a desired single fiber fineness and a desired cross-sectional shape are adopted. Can be produced by the following yarn production method.

  In the case of production of the short staple fiber A and the multileaf thin staple fiber B, for example, the polyester is melted and passed through a spinneret having 550 to 1300 discharge holes having a pore diameter of 0.2 to 0.4 mm, and 20 to After melt spinning at a spinning temperature of 40 ° C and spinning from the nozzle, air at a temperature of 10 to 25 ° C is blown at a flow rate of 40 to 100 m / min and cooled, and then a spinning oil is applied and the take-up speed is increased. An undrawn yarn tow is obtained by temporarily placing it in a can at 900 to 1500 m / min.

  Next, the obtained undrawn yarn tow is subjected to one-stage drawing at a draw ratio of 2.5 to 3.5 times using a liquid bath at a temperature of 80 to 95 ° C., and preferably 7 to 20 threads using a crimper. / 25mm mechanical crimp is applied, an oil solution containing polysiloxane such as amino-modified silicon at a concentration of 1 to 10% by mass is applied by spray, and dried at a temperature of 80 to 165 ° C. for 15 to 30 minutes, Short fibers having a single fiber fineness of 0.5 to 2.0 dtex can be produced by cutting to a length of 10 to 60 mm.

  The above mechanical crimp is a two-dimensional zigzag crimp.

  In the case of producing hollow thick and short fibers C, for example, polyester is melted and passed through a spinneret having 90 to 200 hollow fiber discharge holes (for example, discharge holes in which a plurality of slits are arranged on the circumference). , Melt-spun so that a hollow portion is formed at a spinning temperature 20 to 40 ° C. higher than the melting point, and air at a temperature of 10 to 25 ° C. is blown at a flow rate of 100 to 180 m / min onto the fiber spun from the die. After cooling, a spinning oil agent is applied, and once put in a can at a take-up speed of 1000 to 1700 m / min, an undrawn yarn tow is obtained.

  Next, the obtained undrawn yarn tow is stretched by one step using a liquid bath at a temperature of 80 to 100 ° C. at a draw ratio of 2.5 to 3.5 times, and preferably 5 to 10 threads using a crimper. / 25 mm structural difference crimp or / and mechanical crimp, oil solution containing polysiloxane such as amino-modified silicon at a concentration of 1 to 10% by weight is applied by shower, at a temperature of 80 to 165 ° C. It can be dried for 5 to 30 minutes and cut to a length of 30 to 90 mm to produce hollow thick and short fibers having a single fiber fineness of 5.0 to 20.0 dtex.

  The mechanical crimp is a two-dimensional zigzag crimp, and the structural difference crimp is a three-dimensional spiral (spring-like) crimp.

  Moreover, as a method of mixing the short staple fiber A, the multileaf thin short fiber B, and the hollow thick short fiber C, for example, after each short fiber is laminated and passed through a fiber opening machine, air blowing and / or The method of mixing with a card machine can be adopted. Alternatively, a method may be employed in which the tows before being made into short fibers are overlapped and mixed by cutting at the same time, then passed through a fiber opening machine, and mixed by airing and / or carding.

  In addition, an oil component containing silver, calcium or copper is preferably contained in at least one of the fibers constituting the mixed cotton stuffed cotton, that is, the short fibers A, the multileaf thin fibers B, and the hollow thick fibers C. Can be made into a mixed cotton stuffed cotton having antibacterial, antifungal, antiviral, deodorizing and deodorizing performance by applying in a mass ratio of 0.1 to 1.0% by mass.

  As silver, calcium or copper contained in the oil component used here, for example, particles of 1 to 50 μm in diameter made of calcium phosphate / hydroxide, silver or copper oxide compound, chloride compound, nitrogen compound, amino compound and Examples include those obtained by fixing coordination compounds or particles containing other metal coordination compounds. These may be dispersed in a phosphoric acid aqueous solvent, applied to the fiber, and attached to the fiber surface.

  In this case, for example, an oil agent component containing silver, calcium or copper can be mixed with an oil agent containing polysiloxane and simultaneously applied to the fiber. Moreover, each oil agent can also be independently given back and forth independently. Specifically, an oil agent containing silver or the like may be applied after applying an oil agent containing polysiloxane, or an oil agent containing polysiloxane may be applied after applying an oil agent containing silver or the like.

  The mixed cotton stuffed cotton of the present invention has excellent bulkiness, is soft and rich in texture similar to feathers, is light and easy to follow the body, has excellent heat retention, has high recoverability after long-term compression, and further has antibacterial and antibacterial properties. It is a stuffed cotton having fungus, antiviral, deodorant or deodorizing performance, and is suitably used for bedding such as comforters and pillows, clothing such as unjackets, cushions, stuffed animals, and shruffs.

The mixed cotton stuffed cotton of the present invention and the mixed raw cotton for stuffed cotton used will be described in detail using the following examples. The measurement of the mixed cotton stuffing cotton characteristics was performed by the following method.
<Measurement of bulkiness characteristics>
(Measurement of initial bulkiness)
The prepared mixed cotton stuffed cotton and feathers were put into a side fabric having a size of 20 cm × 20 cm to prepare a sample, and then a load of 0.094 g / cm ² was applied to measure the initial bulkiness.

(Measurement of compression bulk)
After measuring the initial bulkiness, disconnect the load 0.094 g / cm ^2, after applying a load of 10.0 g / cm ^2, to measure the compression bulky.

(Measurement of recovery bulk)
After measuring the compression bulky, disconnect the load 10.0 g / cm ^2, after applying a load of 0.094 g / cm ^2, to measure the bulk recovery.

(Measurement of recovery bulk after long-term compression)
After measuring the initial bulkiness, disconnect the load 0.094 g / cm ^2, after applying a load of 10.0 g / cm ^2, left for 1 day, then disconnect the load 10.0 g / cm ^2, and allowed to stand 6 hours The back sample was beaten, a load of 0.094 g / cm ² was applied, and the recovery bulk after long-term compression was measured.

(Measurement of clo value)
The produced mixed cotton-padded cotton and feathers were put into a side of 150 cm × 210 cm, and the clo value was measured according to JIS L1096 (1999).

Example 1
Polyethylene terephthalate having an intrinsic viscosity (IV) of 0.65 is melted, melt-spun at a spinning temperature of 285 ° C. through a spinneret having a round cross-section discharge hole of 0.3 mm in diameter of 930 holes, and the fiber spun from the base After cooling by blowing air at a temperature of 20 ° C. at a flow rate of 50 m / min, a nonionic spinning oil was applied, and once placed in a can at a take-up speed of 1500 m / min, an undrawn yarn tow was obtained. . Next, the obtained undrawn yarn tow was stretched by 1.85 times at a draw ratio of 2.85 times using a liquid bath at a temperature of 90 ° C., and 18 crimps / 25 mm of mechanical crimps were imparted using a crimper, An oil solution containing polysiloxane at a concentration of 8% by mass is applied by spray, dried at a temperature of 145 ° C. for 20 minutes, cut to a length of 38 mm, a single fiber fineness of 1.3 dtex, a fiber length of 38 mm, A raw cotton (a1) of a short fiber A having a round cross section with a siloxane adhesion amount of 0.5% by mass was produced. The inter-fiber friction coefficient of the obtained short staple fiber A was 0.15.

  Next, polyethylene terephthalate having an intrinsic viscosity (IV) of 0.65 is melted and melt-spun at a spinning temperature of 290 ° C. through a spinneret having 745 holes for Y-type fiber discharge (slit width 0.08 mm). The fiber spun from is cooled by spraying air at a temperature of 20 ° C. with a flow of 50 m / min, and then a nonionic spinning oil agent is applied, and once placed in a can at a take-up speed of 1200 m / min. An undrawn yarn tow was obtained. Next, the obtained undrawn yarn tow was subjected to one-stage drawing using a liquid bath at a temperature of 90 ° C. at a draw ratio of 3.27 times, and a mechanical crimp of 18/25 mm was imparted using a crimper. An oil solution containing siloxane at a concentration of 8% by mass is applied by spraying, dried at a temperature of 165 ° C. for 20 minutes, cut to a length of 38 mm, a single fiber fineness of 1.8 dtex, a fiber length of 38 mm, polysiloxane A raw cotton (b1) of multi-leaf thin short fibers B having a Y cross-section with an adhesion amount of 0.75% by mass and an irregularity degree of 2.65 was produced. The inter-fiber friction coefficient of the obtained multileaf thin short fiber B is 0.16.

  In addition, spinning of polyethylene terephthalate having an intrinsic viscosity (IV) of 0.70 and 180 hollow fiber discharge holes (discharge holes in which three slits having a slit width of 0.1 mm are arranged on the circumference) The melt spinning was performed so that a hollow portion was formed at a spinning temperature of 275 ° C. through the die, and the fibers spun from the die were blown with air at a temperature of 20 ° C. with a flow of 165 m / min, and then cooled. An undrawn yarn tow was obtained by applying a spinning oil agent of the type and once storing it in a can at a take-up speed of 1655 m / min. Next, the undrawn yarn tow obtained was subjected to one-stage drawing using a liquid bath at a temperature of 90 ° C. at a draw ratio of 2.45 times, and a structure difference crimp and a mechanical crimp using a crimper were 7 threads / 25 mm, an oil solution containing polysiloxane at a concentration of 4% by mass is applied by spray, dried at a temperature of 145 ° C. for 10 minutes, cut to a length of 64 mm, and a fiber with a single fiber fineness of 7.6 dtex. A raw cotton (c1) of hollow short fiber C having a hollow round cross section having a length of 64 mm, a polysiloxane adhesion amount of 0.3 mass%, and a hollow ratio of 35% was produced. The obtained hollow thick short fiber C has an interfiber friction coefficient of 0.17.

  The raw cotton (a1) of the short staple fiber A obtained above, the raw cotton (b1) of the multileaf thin short fiber B, and the raw cotton (c1) of the hollow thick short fiber C are mixed in a mass ratio of 25:25:50 (25 mass). % / 25% by mass / 50% by mass), and after passing through a fiber opening machine, three kinds of mixed cotton stuffed cotton were produced through a card machine.

  The obtained three kinds of mixed cotton-stuffed cotton were put into a side fabric to prepare a sample, and then bulkiness characteristics and a clo value were measured. The results are shown in Table 1. It can be seen that the obtained mixed cotton-stuffed cotton is excellent in bulkiness and heat retention, as well as feathers, and has a thickness recovery performance after long-term compression superior to feathers.

(Comparative Example 1)
The raw cotton (a1) of the fine short fiber A obtained in Example 1 and the raw cotton (c1) of the hollow thick short fiber C are laminated at a mass ratio of 30 to 70 (30% by mass / 70% by mass). After passing through the opening machine, two kinds of mixed cotton stuffed cotton were produced through the card machine.

  The obtained mixed cotton stuffed cotton was thrown into a side fabric to prepare a sample, and then bulkiness characteristics and a clo value were measured. The results are as shown in Table 1. The obtained mixed cotton stuffed cotton was excellent in initial bulkiness and recoverability, but was inferior in heat retention.

(Comparative Example 2)
The raw cotton (b1) of the multileaf thin short fiber B obtained in Example 1 and the raw cotton (c1) of the hollow thick short fiber C are laminated at a mass ratio of 30 to 70 (30% by mass / 70% by mass). Then, after passing through the opening machine, two kinds of mixed cotton-padded cotton were produced through the card machine.

  The obtained mixed cotton stuffed cotton was thrown into a side fabric to prepare a sample, and then bulkiness characteristics and a clo value were measured. The results are as shown in Table 1. The obtained mixed cotton stuffed cotton was very excellent in initial bulkiness, but was inferior in recoverability.

(Comparative Example 3)
A feather of 90% by mass of down and 10% by mass of feather was thrown into the side ground to prepare a sample, and then the bulk property and the clo value were measured. The results are shown in Table 1.

Claims (6)

10% to 50% by mass of a short fiber A having a single fiber fineness of 0.5 to 3.0 dtex (excluding multi-leaf cross-sectional fibers), and a single fiber fineness of 0.5 to 3.0 dtex 10 to 50% by mass of multileaf thin short fibers B having crimps and 40 to 80% by mass of hollow thick short fibers C having structural difference crimps and / or mechanical crimps having a single fiber fineness of 5.0 to 20.0 dtex. Cotton blended cotton, characterized by being mixed. 2. The mixed cotton-padded cotton according to claim 1, wherein the cross section of the short fiber A is a round cross section. An oil agent containing polysiloxane is attached to at least one of the short staple fiber A, the multileaf thin staple fiber B, and the hollow thick staple fiber C in the range of 0.1 to 3% by mass. Item 3. A blended cotton according to item 1 or 2 . The mixed cotton stuffed cotton according to claim 3 , wherein the inter-fiber friction coefficient μS of the short fiber to which the oil containing polysiloxane is adhered is 0.2 or less. The mixed cotton stuffed cotton according to any one of claims 1 to 4 , wherein the multifilamentary short fibers B have a deformity of 2.0 to 4.0. The mixed cotton stuffed cotton according to any one of claims 1 to 4 , wherein a hollow ratio of the hollow thick and short fibers C is 20 to 50%.