JP2015188487A - wadding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide wadding that has excellent bulkiness and heat-retaining properties and allows functions of agents attached to the wadding to be expressed easily, and provide a fiber product using the wadding.SOLUTION: Wadding includes 20 to 100 wt.% of hollow fiber and has 0.1 to 11.0 dtex of weighted average fineness of all fibers constituting the wadding. The hollow fiber includes: a core part of which a cross section perpendicular to a fiber axis has a round shape; and 6 to 12 fin parts that protrude radially from an outer periphery of the core part. On the cross section perpendicular to the fiber axis of the hollow fiber, a percentage of hollowness expressed by the following formula is 5 to 25%. The wadding can solve the above problem.

Description

  The present invention provides a cotton wool having excellent bulkiness and heat retention, and a fiber product using the cotton wool.

  Conventionally, feathers having excellent texture, light weight and high heat retention properties are suitably used as stuffing cotton in the fields of futons, pillows, clothing padding and the like. However, feathers have a problem that the supply amount fluctuates due to the influence of the climate and the plague and the price increases. Also, from the viewpoint of animal welfare, there is a movement to eliminate its use, mainly in the West. In order to cope with these situations, attempts have been made to substitute feathers with synthetic fibers. For example, a cotton pad that approximates feathers has been proposed by combining a plurality of fibers having different fineness, cross-sectional shape, crimped shape, and the like (see, for example, Patent Document 1 and Patent Document 2). They propose a cotton padding with high bulkiness and heat retention by mixing hollow thick and short fibers to prevent deterioration of heat retention due to bulkiness and bulkiness, and fine fibers for enhancing heat retention. However, since bulkiness and heat retention are shared and carried by different constituent fibers, there is a problem that when one of these is increased, a trade-off occurs at the expense of the other. .

JP 2006-115987 A JP 2012-214951 A

  The present invention has been made in view of the above background, and an object of the present invention is to provide a cotton wool that has both excellent bulk recovery and heat retention, and a fiber product using the cotton wool.

  As a result of intensive investigations to achieve the above-mentioned problems, the inventors of the present invention have high bulkiness and bulk recoverability due to the rigidity of the single yarn fiber when the stuffed cotton is constituted by hollow fibers having fin portions protruding radially. The present invention is based on the finding that heat retention can be improved not only by the hollow portion in the single yarn fiber but also by the fine voids formed between the single yarn fibers by the radially projecting fins, and by further earnest study It came to complete.

Thus, according to the present invention, “a stuffed cotton containing 20 to 100% by weight of hollow fibers, wherein the weighted average fineness of all the fibers constituting the stuffed cotton is 0.1 to 11.0 dtex, The hollow fiber has a core part having a round or polygonal cross section perpendicular to the fiber axis, and 6 to 12 fin parts projecting radially from the outer peripheral surface of the core part. In the cross section perpendicular to the fiber axis of the fiber, the hollowness shown by the following formula is 5 to 25%, and the filling cotton hollowness (%) = [1− (A / B)] × 100
A: Cross-sectional area perpendicular to single yarn fiber axis B: Single-fiber cross-sectional outermost circumference area ”
Is provided. The hollow fiber is preferably a tow made of a polyester polymer or a short fiber. In addition, according to the present invention, there is provided any textile product selected from the group consisting of a futon, a pillow, a stuffed toy, a garment, and a cushion structure, including the above-described cotton stuffing.

  ADVANTAGE OF THE INVENTION According to this invention, the cotton stuffing which has the outstanding bulkiness and heat retention property can be provided. Furthermore, a textile product using the stuffed cotton can be provided, and comfortable living materials can be provided to consumers of the textile product.

It is a schematic diagram of the cross section orthogonal to the fiber axis of the hollow fiber (single yarn fiber) that can be used in the present invention, and R and r represent the major axis of the outermost periphery and the major axis of the core part in the schematic diagram of the cross section, respectively. . It is a schematic diagram of the discharge hole in the spinneret which manufactures the hollow fiber which can be used by this invention.

Hereinafter, embodiments of the present invention will be described in detail.
First, in the hollow fiber contained in the stuffed cotton of the present invention, it is important that the cross section perpendicular to the fiber axis has a hollow core portion and fin portions that protrude radially from the outer surface of the core portion. is there. In the hollow fiber, the cross section orthogonal to the fiber axis has a hollow core portion and fin portions protruding radially from the outer surface of the core portion. Due to the gaps formed between the inner fibers and the single fibers, it is possible to obtain stuffed cotton having excellent bulkiness and heat retention. Here, when the fin part does not protrude radially from the outer peripheral surface of the core part, for example, in the case of a shape like a “well” type, when a load is applied from all directions perpendicular to the fiber axis, There is a specific direction in which the fin portion is particularly likely to be deformed, and there are cases where bulkiness and heat retention cannot be exhibited even if it is packed.

  Further, it is important that the core part is hollow, and in the case of a solid fiber that does not have a hollow part, the excellent bulkiness and heat retaining properties that are manifested by the presence of the hollow part cannot be obtained. In addition, the shape of the core portion is hollow as shown in FIG. 1 so as to show resistance to isotropic repulsion or deformation of the core portion shape in any compression direction in a cross section orthogonal to the fiber axis. It is preferably a round cross-sectional shape having a portion or a polygonal cross-section having 6 or more sides. Although it has a hollow part like Unexamined-Japanese-Patent No. 2011-200295, in the case of the shape of a rectangular cross section, since it becomes easy to collapse when compressed in the diagonal direction of a rectangle, it is not preferable. The shape of the core part is preferably a round cross section or a polygonal cross section having 6 or more sides, more preferably a round cross section or 6 to 12 squares, Preferably it is an 8-10 square shape.

When the major axis of the outermost circumference of the cross section orthogonal to the fiber axis of the single yarn fiber is R and the major axis of the core part is r, the degree of variation defined by the following formula is preferably 1.2 to 3.0. If the degree of profile is less than 1.2, sufficient gaps between fibers cannot be obtained, and heat retention cannot be obtained. If the ratio is larger than 3.0, the fins may be bent or bent when compressed, and the performance as a fiber or stuffed cotton may be impaired. A more preferable range of the degree of modification is 1.4 to 2.9, an even more preferable range of the degree of modification is 1.5 to 2.8, and an even more preferable range of the degree of modification is 1.8 to 2. 7, and the most preferable range of the degree of variation is 1.9 to 2.1.
Atypical degree = R / r
R: major axis of outermost circumference of cross section perpendicular to single yarn fiber axis r: major axis of core portion of cross section perpendicular to single yarn fiber axis

  Next, the number of fin portions projecting radially from the outer surface of the core portion is 6 to 12, preferably 8 to 10. When the number of fins is less than 6, the effect of forming dead air (an air layer that does not move) is reduced, and the heat retention is reduced. When the number is more than 12, it is not preferable because the space between the fins becomes small and sufficient dead air cannot be formed between the fibers, and the cross section does not have the fins. Moreover, it is preferable that such fin portions extend in the fiber length direction (fiber axis direction) because excellent bulkiness and heat retention are easily obtained. In the case where the above-mentioned polygon having 6 or more sides is a polygon having the same number of sides as the number of fins of the fin portion, the core portion even if a load from a direction perpendicular to the fiber axis cross section is applied Is preferable because it is difficult to collapse.

In the hollow fiber, the outer peripheral portion of the cross section orthogonal to the fiber axis is connected by a line (the broken line portion in FIG. 1), and the inner area (single fiber cross section outermost peripheral area) is the area B, orthogonal to the single fiber axis When the cross-sectional area (area occupied by the polymer resin or the like) is A, the hollow ratio (%) defined by the following formula is preferably 5 to 25%. More preferably, it is 6-23%, and still more preferably 7-19%.
Hollow ratio (%) = [1- (A / B)] × 100
A: Cross-sectional area orthogonal to the single fiber axis (area of the portion occupied by the polymer resin constituting the fiber)
B: Outer peripheral area of cross section of single yarn fiber

  When the hollow ratio is less than 5%, a sufficient air layer cannot be maintained, so that high heat retention cannot be obtained. If the hollowness exceeds 25%, when a load is applied, the fins formed in one hollow fiber are inserted between the fins of other adjacent hollow fibers, or the hollow of the core part is It is not preferable that the material is crushed because the bulkiness is impaired. On the other hand, when the hollowness exceeds 25%, when mechanical crimping is applied by a conventional method as described later, it becomes difficult to apply crimping, and it becomes difficult to obtain high bulkiness. By the combination of the shape of the core part, the hollowness, and the number of fin parts as described above, the object of the present invention, excellent bulkiness and heat retention can be achieved at the same time. Moreover, in order to make the weighted average fineness as the whole stuffing cotton into the value mentioned later, in the fiber having the shape as described above, the single yarn fineness is 0.5 to 10.0 dtex, preferably 0.8 to 9. 5 dtex, more preferably in the range of 1.0 to 8.0 dtex. In addition, in order to make the shape, atypical degree, hollowness, number of fins, and single yarn fineness of the core part of the fiber constituting the above-described stuffed cotton of the present invention within a predetermined shape or numerical range, design of the shape of the spinneret It can be appropriately adjusted and achieved by a combination of drawing conditions such as the discharge amount of the polymer species constituting the fiber, the take-up speed, the magnification for drawing the apparently drawn yarn or the partially drawn yarn.

  In the hollow fiber, the fiber may be a long fiber, but a short fiber having a fiber length of 3 to 100 mm is preferable because excellent bulkiness and heat retention are obtained. A more preferable fiber length is 5 to 90 mm, and an even more preferable fiber length is 10 to 80 mm. In addition, it is preferable that crimps are imparted to the hollow fibers because it is expected that the bulkiness and heat retention of the stuffed cotton are further improved. At that time, as a method of imparting crimps, a method of imparting spiral crimps by anisotropically cooling single yarn fibers, the number of crimps is 3 to 40 / 2.54 cm (preferably 7 to 18) /2.54 cm, more preferably 10 to 17 pieces / 2.54 cm), and various methods such as a method of imparting mechanical crimping by an ordinary indentation crimper method may be used. It is preferable to provide mechanical crimping from the viewpoint of the above.

  The type of polymer that forms the hollow fiber is not particularly limited, and may be polyester, polyamide, or ordinary fiber-forming polymer such as polyethylene, polypropylene, polyacrylonitrile, polystyrene, or other polyolefins. Among them, polyesters such as polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polytrimethylene naphthalate, polybutylene naphthalate, polylactic acid, or stereocomplex polylactic acid, and the third component are copolymerized. Preferred examples include copolymer polyesters. Examples of such polyester include material-recycled or chemical-recycled polyester, and polyethylene terephthalate, which is described in JP-A-2009-01694, using a monomer component obtained from a biomass-derived material, that is, a biological material, Polytrimethylene terephthalate, polyethylene naphthalate, and polytrimethylene naphthalate may be used. Among these, polyethylene terephthalate and polybutylene terephthalate are particularly preferable in that they have rigidity enough to prevent deformation of the fiber cross-sectional shape even when there is a load. Polytrimethylene terephthalate is particularly preferable in that it has soft characteristics. Furthermore, the polyester obtained using the catalyst containing the specific phosphorus compound and titanium compound which are described in Unexamined-Japanese-Patent No. 2004-270097 and 2004-2111268 may be sufficient. In the polyester, a fine pore forming agent, a cationic dye dyeing agent, an anti-coloring agent, a thermal stabilizer, a fluorescent whitening agent, a matting agent, a coloring agent may be added as necessary within the range not impairing the object of the present invention. 1 type (s) or 2 or more types of an agent, a hygroscopic agent, and inorganic fine particles may be contained. The polyolefin is not limited to the above single-component polyolefin, but may be a copolymer of the above polyolefin, a carboxyl group such as vinyl acetate, maleic acid, maleic anhydride, a hydroxyl group, an ester group, an amino group, an amide group. Further, a polyolefin obtained by copolymerizing an alkene having a cyano group or a halogen group may be used.

In the hollow fiber, the oil agent includes a smoothing agent such as fatty acid ester, polyhydric alcohol ester, ether ester, polyether, polysiloxane, mineral oil, antistatic agent, surfactant, bundling agent, and rust inhibitor. Further, an antiseptic and an antioxidant may be added. In particular, an oil containing polysiloxane is preferable because it provides smoothness and soft texture to the fiber.
The hollow fiber has, for example, a discharge shape schematically shown in FIG. 3 using a polyester polymer having an intrinsic viscosity (measured at 35 ° C. using orthochlorophenol as a solvent) of 0.55 to 0.80 dL / g. After spinning and drawing by a conventional method using a base having, an oil agent is applied if necessary, then a mechanical crimp is applied by an indentation crimper if necessary, and a predetermined fiber as described above if necessary It can be manufactured by cutting into long pieces.

  The stuffed cotton of the present invention has the characteristics as described above, contains 20 to 100% by weight of hollow fibers produced by the above method, and the total weighted average fineness needs to be 0.1 to 11.0 dtex. There is. Here, the weighted average fineness is obtained by multiplying the fineness of the hollow fibers constituting the filling cotton by the weight fraction of the hollow fibers contained in the filling cotton. When there are a plurality of types of fibers (including fibers that are not hollow fibers having fins as described above) constituting the stuffed cotton, a numerical value obtained by multiplying the fineness and the weight fraction is added for each fiber component. . When the mixing ratio of the hollow fibers is less than 20% by weight, the above-described effects of the hollow fibers cannot be obtained. More preferably, the range of the mixing ratio of the hollow fibers is 30 to 100% by weight, and still more preferably 40 to 100% by weight. In addition, when the weighted average fineness of the fibers constituting the cotton filling containing 20% by weight or more of the hollow fibers is smaller than 0.1 dtex, the hollowness is a sufficient value and the number of fins is a fiber having the above number. However, the effect of forming dead air (an air layer that does not move) is reduced. As a result, the stuffed cotton is not preferred because it lacks bulkiness and bulk recovery. When the weighted average fineness exceeds 11.0 dtex, the heat retaining property is insufficient, which is not preferable. More preferably, the range of the weighted average fineness of the fiber is 0.5 to 10 dtex, and even more preferably 1.0 to 8.0 dtex. Here, the weighted average fineness of the fibers constituting the stuffed cotton is obtained by multiplying the single yarn fineness (in units of dtex) and the blending ratio (0 to 100%) of the stuffed cotton for each type of the constituent fibers. It can be calculated by the sum of the fibers. The weighted average fineness can be appropriately adjusted according to the selection of the fineness of the fibers constituting the stuffed cotton and the spinning / drawing conditions of the fibers (size of the discharge hole of the spinneret, draw ratio, etc.).

  The stuffed cotton of the present invention includes the hollow fiber, and the hollow fiber has a cross-sectional shape, in particular, a core portion shape, a hollow ratio, and a number of fins. Because of its high rigidity and resilience, it is excellent in bulkiness and bulk recovery. In addition to the hollow part, by having radially protruding fins, voids are created not only in the single yarn fiber but also between the single yarn fibers, so that the bulk is further improved and the heat retention is also improved. Can be made. That is, the effect of the present invention is an effect obtained for the first time by having a hollow part and an appropriate number of fin parts in the same fiber, and is a fiber having only a hollow part or only a fin part (round hollow cross section). With fibers, multi-leaf cross-section fibers such as Y-shaped cross-sections and cross-sections, it is difficult to obtain a sufficient effect. Further, in the stuffed cotton of the present invention, it is preferable to contain a lot of hollow fibers produced by the above method, but as the fiber constituting the stuffed cotton, 0.01 to 1.1 dtex ultrafine solid fibers of 10 to 80 are used. Cotton filling with a composition containing mass% is also a preferred embodiment. In particular, the inclusion of solid fibers with a fineness is preferable in that the entire stuffed cotton has sufficient resilience and the surface feel can be softened.

  The form of the stuffed cotton is not particularly limited. Cotton, web, fiber ball, resin cotton, uncrimped tow, crimped tow, and fiber structure opened by a card machine or a spreader Any form may be used. Moreover, in order to improve heat retention, you may implement blending of an ultrafine fiber, a melt blown nonwoven fabric, etc.

  Next, the textile product of the present invention is any textile product selected from the group consisting of a futon, a pillow, a stuffed toy, a garment, and a cushion structure, including the above-described cotton filling. Usually, these textile products are composed of the padding and the side fabric. In that case, as a fabric which comprises a side fabric, the normal woven / knitted fabric comprised by the fiber which consists of polyester, cotton, etc. may be sufficient. Since the fiber product of the present invention contains the above-mentioned cotton wool, it has excellent bulkiness, bulk recovery properties, and heat retention.

  Next, although the Example and comparative example of this invention are explained in full detail, this invention is not limited by these. In addition, each measurement item in an Example was measured with the following method.

<Intrinsic viscosity (IV)>
A predetermined amount of the polymer sample was weighed and dissolved in o-chlorophenol at 35 ° C. to a concentration of 0.012 g / ml, and then determined according to a conventional method.

<Fineness>
Measured by the method described in JIS L 1015: 2005 8.5.1 Method A.

<Strength / Elongation>
It was measured by the method described in JIS L 1015: 2005 8.7.1 method.

<Number of crimps, crimp ratio>
It was measured by the method described in JIS L 1015: 2005 8.12.1 to 8.12.2.

<Hollow rate>
Hollow ratio (%) = [1- (A / B)] × 100
A: Cross-sectional area perpendicular to the single yarn fiber axis B: Single-fiber cross-sectional outermost area

<Atypical degree>
Atypical degree = R / r
R: major axis of outermost circumference of cross section perpendicular to single yarn fiber axis r: major axis of core portion of cross section perpendicular to single yarn fiber axis

<Bulkness>
The test sample was produced so that the filling cotton produced from the lamination | stacking card | curd web etc. was cut by the magnitude | size of 14.1cm x 14.1cm, and a weight might be set to 20g. Next, a load plate of 0.5 g / cm ² was placed on the sample, 2 kg of weight was placed for 30 seconds, and then 2 kg of this weight was removed and left for 30 seconds. This operation was repeated 3 times, the weight was removed for 2 seconds except 2 kg of weight, the height of the four corners was measured, the average value was obtained, and the bulk (cm ³ / g) was calculated by the following formula. A bulkiness of 85 cm ³ / g or more is considered good.
Bulkiness (cm ³ /g)=(14.1×14.1×h/10)/W
h: Average height of four corners of sample (mm)
W: Mass of sample (g)

<Heat retention>
The amount of heat release was measured by ASTM D-1518-57T, and the heat retention (%) was calculated by the following formula. If the heat retention is 75% or more, it is considered good.
Thermal insulation (%) = [1 − ((Heat release amount when a test piece is attached to a heating element (W / h)) / (Heat release amount of a heating element in a blank test (W / h))] × 100

[Example 1]
Polyethylene terephthalate having an intrinsic viscosity of 0.64 dL / g and a melting point of 256 ° C. dried at 80 ° C. for 1 hour and 170 ° C. for 4 hours was melted, and discharged at 600 g / min from a spinneret having 534 holes as shown in FIG. . The discharged yarn was air-cooled with cooling air at a position 31 mm from the discharge surface and wound at a speed of 750 m / min to obtain an undrawn yarn. This undrawn yarn was drawn 2.41 times in warm water at 70 ° C., 1.10 times in warm water at 90 ° C., 0.3 wt% potassium stearate was added, and then heated to 45 ° C. Thereafter, crimping was performed with an indentation crimper, and after drying at 136 ° C. for 60 minutes, the fiber was cut into a fiber length of 64 mm, a fineness of 6.6 dtex, a hollowness ratio of 8%, a degree of profile 1.90, and a tensile strength of 2 A short fiber having a .66 cN / dtex, an elongation of 58.4%, a number of crimps of 13.3 pieces / 2.54 cm, and a crimp rate of 15.5% was obtained.
The obtained short fibers were carded on a roller card, and card webs were laminated with a molding machine to produce stuffed cotton, and the bulkiness was evaluated. The obtained results are shown in Table 1.

[Example 2]
Except that the discharged yarn is air-cooled with cooling air at a position 27 mm from the discharge surface, the same as in Example 1, fineness 6.6 dtex, hollowness 12%, profile degree 1.95, tensile strength A short fiber having 2.66 cN / dtex, elongation of 58.4%, number of crimps of 13.3 pieces / 2.54 cm, and crimp rate of 12.5% was obtained. The obtained short fibers were evaluated for bulkiness and heat retention in the same manner as in Example 1. The obtained results are shown in Table 1.

[Example 3]
Polyethylene terephthalate having an intrinsic viscosity of 0.64 dL / g and a melting point of 256 ° C., dried at 80 ° C. for 1 hour and 170 ° C. for 4 hours, was melted and discharged from a spinneret having 534 holes as shown in FIG. . The discharged yarn was air-cooled with cooling air at a position 31 mm from the discharge surface, and wound at a speed of 500 m / min to obtain an undrawn yarn. This unstretched yarn was stretched 8.4 times in warm water at 90 ° C. and 2.50 times in warm water at 90 ° C., and after 0.3% by weight of potassium stearate was imparted, crimps were imparted, After drying at 136 ° C. for 60 minutes, it was cut into a fiber length of 38 mm, the fineness was 1.1 dtex, the hollowness was 18%, the profile was 1.50, the tensile strength was 2.3 cN / dtex, the elongation was 51%, A short fiber having a number of crimps of 13.9 pieces / 2.54 cm and a crimping ratio of 10.5% was obtained. The obtained short fibers were evaluated for bulkiness and heat retention in the same manner as in Example 1. The obtained results are shown in Table 1.

[Example 4]
After the short fibers (hollow fibers) obtained in Example 1 and Example 3 were blended so that the weight ratio (the former: the latter) was 50:50, they were carded over a roller card, and the card web was formed with a molding machine. Laminated cotton was produced, and the bulkiness and heat retention were evaluated in the same manner as in Example 1. The obtained results are shown in Table 1.

[Example 5]
After blending the short fibers (hollow fibers) obtained in Example 1 and Example 3 so that the weight ratio (the former: the latter) is 80:20, carding is performed on a roller card, and the card web is formed with a molding machine. Laminated cotton was produced, and bulkiness and heat retention were evaluated for shaking as in Example 1. The obtained results are shown in Table 1.

[Example 6]
400 g from a spinneret having a polyethylene terephthalate having an intrinsic viscosity of 0.47 dL / g and a melting point of 256 ° C. dried at 80 ° C. for 1 hour and 170 ° C. for 4 hours, and 2504 holes having a round cross section with a hole diameter of 0.18 mm. / Min was discharged. The discharged yarn was air-cooled with cooling air at a position 27 mm from the discharge surface, and was wound off at a speed of 1300 m / min to obtain an undrawn yarn. This unstretched yarn was stretched 2.7 times in warm water at 70 ° C. and 1.19 times in warm water at 90 ° C., and after 0.3% by weight of potassium stearate was imparted, crimps were imparted, After drying at 136 ° C. for 60 minutes, it is cut into a fiber length of 38 mm, the fineness is 0.5 dtex, the tensile strength is 3.6 cN / dtex, the elongation is 25%, the number of crimps is 16.2 pieces / 2.54 cm, A solid round cross-section short fiber having a reduction ratio of 13.0% was obtained.
The fibers thus obtained and the short fibers (hollow fibers) obtained in Example 1 were blended so that the weight ratio (the former: the latter) was 50:50, and then carded over a roller card and molded. The card webs were laminated with a machine to produce stuffed cotton, and the bulkiness and heat retention were evaluated in the same manner as in Example 1. The obtained results are shown in Table 1.

[Example 7]
After blending the short fiber (hollow fiber) obtained in Example 1 and the fiber (solid round section short fiber) obtained in Example 6 so that the weight ratio (the former: the latter) is 30:70 Then, carding was carried out on a roller card, and card webs were laminated with a molding machine to produce stuffed cotton, and the bulkiness and heat retention were evaluated in the same manner as in Example 1. The obtained results are shown in Table 1.

[Example 8]
In Example 1, long fiber tows before being cut were collected, opened in a sheet shape, laminated to 100 g / m ^2, and bulkiness and heat retention were evaluated in the same manner as in Example 1. . The obtained results are shown in Table 2.

[Example 9]
In Example 1, the fiber length was set to 32 mm, and after processing into a fiber ball shape with a fiber ball manufacturing apparatus, padding was produced, and the bulkiness and heat retention were evaluated in the same manner as in Example 1. The obtained results are shown in Table 2.

[Comparative Example 1]
In Example 1, the cross-sectional shape is an 8-fin square hollow cross-sectional shape with a hollow rate of 28%, fineness of 6.6 dtex, hollow rate of 18%, variant degree 2.1, tensile strength of 2.89 cN / dtex, and elongation of 49. %, A short fiber having a number of crimps of 11.2 pieces / 2.54 cm and a crimping rate of 5.9% was obtained. The bulkiness and heat retention were evaluated in the same manner as in Example 1. The obtained results are shown in Table 2.

[Comparative Example 2]
In Example 1, a die whose cross-sectional shape is round and hollow is used, and the fineness is 6.6 dtex, the hollowness is 25%, the tensile strength is 3.4 cN / dtex, the elongation is 51%, and the number of crimps is 13.1 / A short fiber of 2.54 cm and a crimp rate of 9.4% was obtained. In the same manner as in Example 1, stuffed cotton and stuffed cotton structures were produced and evaluated. The obtained results are shown in Table 2.

[Comparative Example 3]
In Example 1, a die having a triangular hollow cross section is used, the fineness is 6.6 dtex, the hollowness is 21%, the tensile strength is 2.9 cN / dtex, the elongation is 43%, the number of crimps is 12.8 / A short fiber of 2.54 cm and a crimp rate of 8.5% was obtained. Cotton stuffing and cotton stuffing structures were produced in the same manner as in Example 1, and the bulkiness and heat retention were evaluated in the same manner as in Example 1. The obtained results are shown in Table 2.

[Comparative Example 4]
After blending the short fibers (hollow fibers) obtained in Example 1 and the fibers (solid round cross-section short fibers) obtained in Example 6 so that the weight ratio (the former: the latter) is 15:85. Then, carding was carried out on a roller card, and card webs were laminated with a molding machine to produce stuffed cotton, and the bulkiness and heat retention were evaluated in the same manner as in Example 1. The obtained results are shown in Table 2.

  ADVANTAGE OF THE INVENTION According to this invention, the cotton stuffing which has the outstanding bulkiness and heat retention property can be provided. Furthermore, a textile product using the stuffed cotton can be provided, and comfortable living materials can be provided to consumers of the textile product.

A: This is a region where the black colored portion represents a single fiber cross section (area of the portion occupied by the polymer resin or the like constituting the fiber).
B: The area represented by the dotted line is the outermost peripheral area of the single yarn fiber cross section.
R: The major axis of the outermost circumference of the cross section perpendicular to the single yarn fiber axis.
r: represents the major axis of the core part of the cross section perpendicular to the single fiber axis.

Claims (6)

It is a stuffing cotton containing 20 to 100% by weight of hollow fibers, wherein the weighted average fineness of all the fibers constituting the stuffing cotton is 0.1 to 11.0 dtex, and the hollow fibers are in relation to the fiber axis. The hollow fiber has a core portion that is a round shape or a polygonal shape having six or more sides and a fin portion that protrudes radially from the outer peripheral surface of the core portion, In the cross section orthogonal to the fiber axis, the hollowness shown by the following formula is 5 to 25%,
Hollow ratio (%) = (1− (A / B)) × 100
A: Cross-sectional area perpendicular to single yarn fiber axis B: Single-fiber cross-sectional outermost area The stuffed cotton according to claim 1, wherein the cross-section perpendicular to the fiber axis of the hollow fiber has a degree of irregularity represented by the following formula of 1.2 to 3.0.
Atypical degree = R / r
R: major axis of outermost circumference of cross section perpendicular to single yarn fiber axis r: major axis of core portion of cross section perpendicular to single yarn fiber axis   The cotton stuffing according to claim 1 or 2, wherein the stuffing cotton is formed by crimped tow.   The filling cotton according to any one of claims 1 to 3, wherein the polymer constituting the hollow fiber is polyethylene terephthalate.   The cotton stuffing according to any one of claims 1 to 4, comprising 10 to 80 mass% of solid fibers of 0.01 to 1.1 dtex as fibers constituting the stuffing cotton.   The filling cotton according to any one of claims 1 to 5, wherein the polygon having 6 or more sides is a polygon having the same number of sides as the number of fins.

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