padding

Abstract

The main method of inserting filling into futons is blown-in processing, which provides a soft texture and bulk, but this has the problem of loss of volume and unevenness after washing. 【assignment】 The filling contains 90% by weight or more of short fibers having a fiber length of 15 to 38 mm, the short fibers containing fibers to which a silicone-based oil agent is applied, and the short fibers containing three-dimensionally crimped fibers, and the filling has a bulkiness of 90 to 250 cm before washing. 3 The filling is characterized by being in the form of torn cotton of 1 / g.

Description

[Technical Field]

[0001] The present invention relates to batting. [Background technology]

[0002] The materials used for filling futons must be warm, comfortable, and bulky, and so natural materials such as feathers and cotton, as well as synthetic fibers such as acrylic and polyester, are commonly used. The most commonly used processing method is blowing the fibers into the lining, which uses an air current to blow them open and insert them into the lining, creating a soft texture and increasing bulk.

[0003] However, cotton obtained by blow-in processing has problems such as volume loss and uneven distribution after washing. Patent Document 1, on the other hand, reports a molded product obtained by thermoforming fiber spheres made of composite fibers containing an elastic thermoplastic elastomer in a mold. In this document, the fiber spheres are thermally fused together, which prevents uneven distribution after washing. However, because the fiber spheres are fixed together, the bulkiness and texture of the product are insufficient. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 4791175 Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention was devised in view of the current state of the prior art, and its object is to provide a filling that has high bulkiness and is suppressed from losing volume or becoming uneven after washing. [Means for solving the problem]

[0006] As a result of intensive research to achieve the above-mentioned object, the inventors have discovered that by using staple fibers containing fibers having a fiber length within a specific range and having silicone-based oil applied and three-dimensionally crimped fibers in more than 90% by weight of the filling, and by forming the filling into a torn-off cotton-like material having a specific bulkiness, it is possible to maintain bulkiness while significantly reducing unevenness and loss of volume after washing, and have arrived at the present invention.

[0007] That is, the present invention comprises the following: (1) A filling containing 90% by weight or more of short fibers having a fiber length of 15 to 38 mm, the short fibers containing fibers to which a silicon-based oil agent is applied, and the short fibers containing three-dimensionally crimped fibers, and the filling has a bulkiness of 90 to 250 cm before washing. 3 The filling is characterized by being in the form of torn cotton of 1 / g. (2) The filling described in (1), characterized in that the short fibers contain two-dimensionally crimped fibers. (3) The padding according to (1) or (2), characterized in that the short fibers contain moisture-absorbing and heat-generating fibers. (4) The filling according to any one of (1) to (3), characterized in that the staple fibers consist of staple fibers A having a fineness of 2.0 to 5.0 dtex and staple fibers B having a fineness of 0.5 to 2.0 dtex, and the fineness of staple fibers A is greater than that of staple fibers B. (5) The filling according to (4), characterized in that the short fiber A contains moisture-absorbing and heat-generating fibers. (6) The padding according to any one of (1) to (5), characterized in that the number of crimps in the three-dimensionally crimped fibers is 6 to 18 per 25 mm and the crimp rate is 5 to 28%. (7) The filling according to any one of (1) to (6), characterized in that the twist rate of the filling after washing is 30% or less. (8) Bedding using the filling described in any one of (1) to (7). (9) A method for producing a filling containing 90% by weight or more of short fibers having a fiber length of 15 to 38 mm, characterized in that it includes a step of carding the short fibers to obtain a web, and a step of tearing the web to collect the filling. [Effects of the Invention]

[0008] The filling of the present invention is highly bulky and has little loss of volume or unevenness after washing, so it can be suitably used as filling for futons and clothing. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram showing a typical state of the padding of the present invention before washing. [Figure 2] FIG. 2 is a diagram showing the state of the padding of the present invention after typical washing. DETAILED DESCRIPTION OF THE INVENTION

[0010] The filling of the present invention is composed mostly of short fibers having a specific fiber length. The minimum fiber length of the staple fibers is 15 mm, preferably 18 mm or more, and more preferably 22 mm or more. Fiber lengths shorter than 15 mm are undesirable because the amount of fiber loss during opening and carding increases significantly, making processing difficult. The upper limit is 38 mm, preferably 35 mm or less, and more preferably 32 mm or less. Fiber lengths longer than 38 mm are undesirable because the fibers may entangle with each other during washing, forming a thin, high-density fiber aggregate (kinked fiber), which may lead to reduced volume, unevenness, and reduced comfort.

[0011] The proportion of the short fibers contained in the filling of the present invention has a lower limit of 90% by weight, preferably 93% by weight or more, and more preferably 95% by weight or more. When the proportion of the short fibers is 90% by weight or more, entanglement of the fibers after washing is unlikely to occur, and the volume loss after washing due to the occurrence of the above-mentioned kinked cotton can be suppressed. On the other hand, when the proportion of the short fiber length is less than 90% by weight, the above-mentioned kinked cotton occurs after washing, and the volume loss is likely to occur. There is no particular upper limit to the proportion of the short fibers, but theoretically it cannot exceed 100% by weight.

[0012] The lower limit of the fineness of the staple fibers is preferably 0.5 dtex. If the fineness is less than 0.5 dtex, the fibers may break and become powdery during processing, which is undesirable. The upper limit is preferably 5.0 dtex. If the fineness exceeds 5.0 dtex, even if a certain amount of fine cotton is used, the stiff texture derived from the thick cotton becomes noticeable, which is undesirable as it reduces comfort.

[0013] The staple fibers are preferably composed of fibers having a plurality of different finenesses. Among these, the staple fibers preferably comprise staple fibers A having a fineness of 2.0 to 5.0 dtex and staple fibers B having a fineness of 0.5 to 2.0 dtex, which is smaller than that of staple fibers A. The use of staple fibers having a fineness of 2.0 to 5.0 dtex makes the filling less likely to collapse, and the use of staple fibers having a fineness of 0.5 to 2.0 dtex softens the overall texture of the filling, improving comfort. Note that the terms "staple fibers A" and "staple fibers B" are merely general terms for staple fibers having finenesses within the above ranges, and each of staple fibers A and B may be composed of a single fineness and type of fiber, or two or more finenesses and types of fibers.

[0014] The content of the short fibers A and B in the short fibers may be determined appropriately depending on the performance required of the filling, but from the viewpoint of fully obtaining the above-mentioned effects, it is preferable that the short fiber A is contained in an amount of 40 to 80% by weight, and the short fiber B is contained in an amount of 20 to 60% by weight.

[0015] The short fibers contain fibers to which a silicone-based oil has been applied. The application of the silicone-based oil not only gives the fibers a smooth feel but also improves the sliding properties between fibers, leading to increased volume in the filling and prevention of settling. The type of silicone oil is not particularly limited as long as it can impart the above-mentioned effects to the fibers, and known silicone-based oils such as amino-modified silicone and epoxy-modified silicone can be used.

[0016] The method for applying the silicone-based oil agent is not particularly limited, and any known method can be used, such as a method of impregnating fibers in the oil agent or a dispersion thereof and then squeezing the fibers, or a method of applying the oil agent dispersion by spraying.

[0017] The lower limit of the proportion of fibers to which silicone oil is applied in the filling is preferably 30% by weight, more preferably 50% by weight, and particularly preferably 70% by weight. If the proportion of fibers to which silicone oil is applied is less than 30% by weight, the friction between the fibers increases, leading to settling and volume loss, which is not preferable. There is no particular upper limit, but theoretically it should not exceed 100% by weight.

[0018] The staple fibers contain three-dimensionally crimped fibers. Three-dimensionally crimped fibers are fibers that have a three-dimensional crimp, such as a spiral or coil shape. When the staple fibers contain three-dimensionally crimped fibers, the shape of the fiber agglomerates after washing, as described below, becomes closer to a sphere, reducing the probability of kinked batting, in which the fiber agglomerates are connected to each other, and leading to volume retention and prevention of unevenness after washing of the filling. Here, there are no particular limitations on the method for imparting three-dimensional crimp to the staple fibers, and any known method may be used, including a method in which a composite fiber made of two components with different thermal shrinkage rates is heat-treated to induce crimping.

[0019] The lower limit of the proportion of the three-dimensionally crimped fibers in the filling is preferably 20% by weight, more preferably 30% by weight, and particularly preferably 40% by weight. If the proportion of the three-dimensionally crimped fibers is less than 20% by weight, there is a risk of volume loss due to the occurrence of kinked cotton. The upper limit is preferably 80% by weight, more preferably 60% by weight. If the proportion of the three-dimensionally crimped fibers exceeds 80% by weight, there is a risk of the texture becoming stiff.

[0020] The number of crimps of the three-dimensionally crimped fibers is measured by the method described below, and the number of crimps is preferably 6 to 18 crimps / 25 mm, and more preferably 10 to 15 crimps / 25 mm. If the number of crimps is less than 6 crimps / 25 mm, the shape of the fiber mass after washing will be elongated and lack the characteristics of three-dimensional crimp, increasing the likelihood of the above-mentioned kinked cotton. If the number of crimps is more than 18 crimps / 25 mm, although the shape of the fiber mass after washing will be round, the diameter will be smaller, which increases the bulk density of the fiber mass and may reduce the volume of the filling, which is not preferred.

[0021] The crimp percentage of the three-dimensionally crimped fiber is measured by the method described below, and is preferably 5 to 28%, more preferably 10 to 25%. A crimp percentage of less than 5% is undesirable because, like the case where the crimp number is small, the risk of kinked cotton increases. A crimp percentage of more than 28% is also undesirable because, like the case where the crimp number is large, the diameter of the fiber mass after washing may become smaller, reducing the volume of the filling.

[0022] The staple fibers may contain two-dimensionally crimped fibers in addition to the three-dimensionally crimped fibers described above. Two-dimensionally crimped fibers are fibers that have planar crimps, such as zigzag or wavy crimps. By incorporating both three-dimensionally crimped fibers and two-dimensional fibers into the staple fibers, processability in carding and other processes can be improved compared to when only three-dimensionally crimped fibers are used. There are no particular limitations on the method for imparting two-dimensional crimps to the staple fibers, and any known method may be used, such as a method of mechanically imparting crimps using a crimper or gear roller.

[0023] The lower limit of the proportion of two-dimensionally crimped fibers in the filling is preferably 20% by weight, more preferably 30% by weight. If the proportion of two-dimensionally crimped fibers is less than 20% by weight, the aforementioned improvement in processability may not be sufficiently achieved. The upper limit is preferably 80% by weight, more preferably 70% by weight. If the proportion of two-dimensionally crimped fibers exceeds 80% by weight, the proportion of three-dimensionally crimped fibers decreases, and the aforementioned prevention of kinked cotton, retention of volume after washing of the filling, and prevention of bias may not be sufficient.

[0024] The number of crimps of the two-dimensionally crimped fibers is measured by the method described below, and the number of crimps is preferably 5 to 14 crimps / 25 mm, and more preferably 7 to 12 crimps / 25 mm. If the number of crimps is less than 5 crimps / 25 mm, the fibers will not be entangled with the needles during carding, which may result in fiber loss. If the number of crimps is more than 14 crimps / 25 mm, the fibers will be entangled more tightly than necessary, which may result in a decrease in the volume of the filling.

[0025] The crimp percentage of the two-dimensionally crimped fiber is measured by the method described below, and is preferably 4 to 15%, more preferably 6 to 12%. If the crimp percentage is less than 4%, as with the case where the crimp number is small, the fibers may not be easily entangled around the needle during carding, resulting in possible fiber loss. If the crimp percentage is greater than 15%, as with the case where the crimp number is large, the volume of the filling may be reduced.

[0026] The lower limit of the combined ratio of the three-dimensionally crimped fibers and the two-dimensionally crimped fibers in the filling is preferably 70% by weight. If the ratio of the two types of crimped fibers is less than 70% by weight, the fibers may not be sufficiently entangled, resulting in a decrease in bulkiness and making it difficult to tear the filling into a cotton-like shape. There is no particular upper limit, but theoretically it should not exceed 100% by weight.

[0027] The type of fiber used for the short fibers is not particularly limited, and examples thereof include natural fibers such as wool, animal hair, silk, and cotton, and synthetic fibers such as polyester fibers, polypropylene fibers, polyethylene fibers, polyamide fibers, and acrylic fibers. The filling may be a single type of fiber or a mixture of two or more types of fiber. In addition, hollow fibers may be used as the short fibers to improve the bulkiness of the filling.

[0028] Furthermore, when a moisture-absorbing and heat-generating fiber is introduced into a portion of the staple fibers, particularly into a portion of the above-mentioned staple fiber A, it is possible to impart a texture and moisture absorption performance more similar to that of feathers. There are no particular restrictions on such moisture-absorbing and heat-generating fibers, and examples include animal fibers such as wool, regenerated cellulose fibers such as rayon, and synthetic fibers such as acrylate fibers. Of these, acrylate fibers are preferably used because of their excellent moisture-absorbing and heat-generating properties.

[0029] The acrylate fibers used in the present invention contain carboxyl groups within the fibers, which generate heat when they adsorb moisture, thereby providing the acrylate fibers with excellent moisture-absorbing heat generation properties. Examples of countercations for the carboxyl groups include hydrogen ions, alkali metal ions such as lithium, sodium, and potassium, alkaline earth metal ions such as magnesium and calcium, and ammonium ions. There are no particular limitations on the method for obtaining such acrylate fibers. For example, known methods, such as the method for producing acrylate fibers by crosslinking and hydrolyzing acrylic fibers described in JP 2000-314082 A, may be used, or commercially available products may be used. Examples of such commercially available products include acrylate fibers manufactured by Toyobo Co., Ltd. under the trademarks Ex®, Dismel®, Moisfine®, and Moiscare®, and acrylate fibers manufactured by Teijin Frontier Co., Ltd. under the trademark Sunburner®.

[0030] The lower limit of the proportion of the moisture-absorbing heat-generating fiber in the filling is preferably 20% by weight. By incorporating the moisture-absorbing heat-generating fiber at 20% by weight or more, the filling can not only retain heat due to its high volume, but also absorb steam emitted from the skin, providing unique warmth. The upper limit is preferably 30% by weight. Incorporating the moisture-absorbing heat-generating fiber at more than 30% by weight is not preferred, as it can result in reduced volume and poor processability.

[0031] The filling of the present invention is in a torn-down state before washing. "Torn-down state" refers to a state similar to cotton (torn cotton) obtained by tearing from a carded web or the like. By making the filling in this torn-down state, it is possible to achieve feather-like softness and bulkiness. Here, the major axis of the filling is preferably 3 to 15 cm. If the major axis is less than 3 cm, it may be compressed after washing, becoming denser, and the texture may deteriorate. Furthermore, if the major axis is greater than 15 cm, there is a risk of significant loss of volume after washing.

[0032] The bulkiness of the filling is measured by the method described below, and is 90 to 250 cm before washing. 3 It is preferable that the bulkiness is 90 cm / g. 3 If the bulkiness is less than 250 cm / g, the volume is insufficient and sufficient comfort as a futon cannot be obtained, which is not preferable. 3 A filling larger than / g is difficult to obtain in practice.

[0033] The filling of the present invention suppresses loss of bulkiness even after washing. This is thought to be because the form of the filling changes upon washing, forming fiber agglomerates, which do not entangle with each other but exist individually, thereby suppressing loss of volume of the filling. Here, the bulkiness retention rate of the filling after washing relative to the bulkiness before washing is preferably 60% or more. When the retention rate is 60% or more, it can be said that the loss of bulkiness of the filling due to washing is sufficiently suppressed.

[0034] The twisted batting percentage of the batting is a value indicating the degree of twisted batting that occurs in the batting after washing, and is measured by the method described below. The lower the twisted batting percentage, the more the deterioration of the texture of the batting and loss of volume are suppressed even after washing, making it suitable for use in clothing and bedding. Here, the twisted batting percentage of the batting is preferably 30% or less, and more preferably 20% or less. If the twisted batting percentage exceeds 30%, there is a risk of uneven batting and loss of volume when washed.

[0035] Bedding using the filling of the present invention has the excellent bulkiness derived from the filling described above, and the loss of bulkiness after washing is also suppressed.

[0036] The method for producing bedding using the filling of the present invention is not particularly limited, but examples thereof include the above-mentioned blowing process. Specifically, a method is used in which multiple types of fibers are uniformly blended in a carding machine, the carded web discharged from the carding machine is sucked through the suction port of a blowing machine or the like, and torn from the carded web by the suction, and the obtained filling is continuously blown into a covering material to fill it, and the covering material is sewn and quilted. [Example]

[0037] The present invention will be described in more detail below with reference to examples, but these are merely illustrative and the gist of the present invention is not limited to these examples.

[0038] <Methods for measuring fiber length, fineness, number of crimps, and degree of crimp> Measured in accordance with JISL1015:2010.

[0039] <Method for measuring bulkiness> Approximately 5 g of sample filling is taken from the filling obtained in the Examples described below, and its weight is precisely weighed (W [g]). The sample filling is filled into a polypropylene measuring cylinder with an inner diameter of 11.5 cm, and a filter paper with a diameter of 11 cm is slowly placed on top of it. Then, a loading disk with a diameter of 8.5 cm and a weight of 27 g is placed on top of that in the center and left to stand for 1 minute. The loading disk is then removed and left to stand for 1 minute, after which the loading disk is placed again and left to stand for 1 minute. Then, with the loading disk still in place, the height of the filter paper part is measured at one arbitrary point and at the opposite corner. The average height H [cm] of the filter paper part at these two points is calculated, and the bulkiness V1 is calculated using the following formula. [Formula] Bulky V1[cm 3 / g]=103.9×H / W

[0040] <Bulkiness retention rate before and after washing> The filling sample taken by the bulkiness measurement method described above is washed according to the following method, and the bulkiness of the filling after washing is measured in the same manner. The value obtained by this measurement is the bulkiness after washing V2 [cm 3 / g], and the bulkiness retention rate before and after washing is calculated using the following formula. Bulkyness retention rate [%]=(V2 / V1)×100

[0041] <How to wash> 10g of padding is weighed out and placed in an 18cm x 28cm laundry net. This is then washed in an Aqua Corporation drum washing machine, "AQW-FV800E," on a course that involves washing for 5 minutes, rinsing twice, and spin-drying for 3 minutes. 18g of Kao Corporation's laundry detergent, "Attack Bio EX," is used as the detergent. After repeating the above washing process three times, the item is dried in a hot air dryer at 80°C for 1 hour.

[0042] <Method for measuring twist cotton rate> Approximately 15 g of batting is collected from the sample futon that has been washed using the method described above, and its weight is accurately weighed (W1 [g]). For the collected batting, the part where some of the cotton has gathered into a clump (hereinafter referred to as the cotton gathering part) is picked up with the fingers and shaken lightly. After shaking, any remaining fiber clumps that do not fall are considered to be fiber clumps, and their long diameters are measured. After measurement, fiber clumps with a long diameter of 10 cm or more are considered to be twisted cotton and are separated. The above procedure is carried out for all cotton gathering parts, and the total weight of the separated twisted cotton is accurately weighed (W2 [g]). The twisted cotton percentage [%] is calculated using the following formula: [Formula] Twist cotton rate [%] = (W2 / W1) x 100

[0043] <Production of Acrylate Fiber A> An acrylonitrile polymer (88% by weight acrylonitrile and 12% by weight vinyl acetate) was dissolved in a 48% by weight aqueous solution of sodium rhodanate to prepare a spinning dope. Spinning, water washing, drawing, crimping, heat treatment, and cutting were performed according to standard wet-process acrylic fiber manufacturing methods to obtain acrylic fibers with a single fiber fineness of 1.7 dtex and a fiber length of 32 mm. The acrylic fibers were simultaneously subjected to crosslinking and hydrolysis treatment at 115°C for 2 hours in an aqueous solution containing 1.0% by weight hydrazine hydrate and 0.55% by weight sodium hydroxide, followed by treatment with an 8% by weight aqueous nitric acid solution at 120°C for 3 hours and water washing. The resulting fibers were immersed in water, adjusted to pH 9 with the addition of sodium hydroxide, washed with water, and dried to obtain hygroscopic crosslinked acrylonitrile fibers with sodium salt-type carboxyl groups. Next, the hygroscopic crosslinked acrylonitrile fiber was treated by immersing it in a 0.1 wt% aqueous emulsion of Neoseed (registered trademark) S-09, a paraffin-based water repellent manufactured by Nicca Chemical Co., Ltd., at a bath ratio of 1:11 for 1 hour at room temperature. After that, the fiber was washed with pure water for 1 hour at room temperature, and then dehydrated and dried to obtain acrylate fiber A (fineness 4.0 dtex, fiber length 22 mm).

[0044] <Production of Acrylate Fiber B> Acrylate fiber B (fineness 4.0 dtex, fiber length 50 mm) was obtained in the same manner as in the production of acrylate fiber A described above, except that the fiber length of the acrylic fiber was changed to 76 mm.

[0045] In the examples and comparative examples described below, the crimped polyethylene terephthalate (PET) fibers used were those shown in Table 1. All of the fibers shown in Table 1 had a silicone-based oil applied to their surfaces.

[0046] [Table 1]

[0047] [Example 1] PET fiber B and PET fiber C were mixed in a weight ratio of 40 / 60, and then opened and uniformly mixed in a carding machine. The carded web discharged from the carding machine was sucked into a blowing machine to obtain the filling of Example 1.

[0048] [Example 2] The filling of Example 2 was obtained in the same manner as in Example 1, except that PET fiber A, PET fiber B, and PET fiber C were mixed in a weight ratio of 30 / 30 / 40.

[0049] [Example 3] The filling of Example 3 was obtained in the same manner as in Example 1, except that PET fiber B, PET fiber C, and acrylate fiber A were mixed in a weight ratio of 32 / 48 / 20.

[0050] [Example 4] The filling of Example 4 was obtained in the same manner as in Example 1, except that PET fiber A, PET fiber B, PET fiber C, and acrylate fiber A were mixed in a weight ratio of 30 / 20 / 30 / 20.

[0051] [Comparative Example 1] The filling for Comparative Example 1 was obtained in the same manner as in Example 1, except that only PET fiber D was used. When the filling was washed using the method described above to measure its bulkiness after washing, the fibers were found to be strongly entangled, forming high-density fiber masses. An attempt was made to fill the filling into a cylinder used for measuring bulkiness, but the filling was too elastic to fill the gap between the filling and the container, making it impossible to measure its bulkiness after washing.

[0052] Comparative Example 2 The filling of Comparative Example 2 was obtained in the same manner as in Example 1, except that only PET fiber C was used.

[0053] Comparative Example 3 The filling of Comparative Example 3 was obtained in the same manner as in Example 1, except that PET fiber D and acrylate fiber B were mixed in a weight ratio of 80 / 20.

[0054] The padding obtained in each of the Examples and Comparative Examples was subjected to the above-mentioned measurements, and the results are shown in Table 2.

[0055] [Table 2]

[0056] As shown in Table 2, the fillings of Examples 1 to 4 all maintained their excellent bulkiness to a high degree even after washing, and the occurrence of kinked cotton, which can cause deterioration in the feel and volume of the filling, was sufficiently suppressed. On the other hand, the filling of Comparative Example 1, which used only PET fiber D with long fiber length, became so elastic after washing that its bulkiness could not be measured, as described above, and the kinked cotton percentage was also very high at 88%. Furthermore, the filling of Comparative Example 2, which used only PET fiber C with two-dimensional crimping, had a high kinked cotton percentage, although not as high as that of Comparative Example 1. The filling of Comparative Example 3, which was made only with acrylate fiber B (fiber length 50 mm) and PET fiber D (fiber length 64 mm), both of which were long fiber lengths, showed poor results in both bulkiness retention and kinked cotton percentage.

Claims

1. A filling containing 90% by weight or more of short fibers having a fiber length of 15 to 38 mm, the short fibers containing fibers to which a silicon-based oil agent is applied, and the short fibers containing three-dimensionally crimped fibers, and the filling has a bulkiness of 90 to 250 cm before washing. ３ The filling is characterized by being in the form of torn cotton of 0.1g.

2. The batting of claim 1, wherein the staple fibers comprise two-dimensionally crimped fibers.

3. 2. The padding according to claim 1, wherein the staple fibers contain moisture-absorbing and heat-generating fibers.

4. 2. The filling according to claim 1, wherein the staple fibers consist of staple fibers A having a fineness of 2.0 to 5.0 dtex and staple fibers B having a fineness of 0.5 to 2.0 dtex, and the fineness of the staple fibers A is greater than that of the staple fibers B.

5. 5. The padding according to claim 4, wherein the short fibers A contain moisture-absorbing and heat-generating fibers.

6. The padding according to claim 1, characterized in that the number of crimps of the three-dimensionally crimped fibers is 6 to 18 per 25 mm and the crimp rate is 5 to 28%.

7. 2. The filling of claim 1, wherein the filling has a twist rate of 30% or less after washing.

8. Bedding using the filling according to any one of claims 1 to 7.

9. A method for producing batting containing 90% by weight or more of short fibers having a fiber length of 15 to 38 mm, the method comprising the steps of: carding the short fibers to obtain a web; and tearing the web to collect the batting.

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