JPH0126313B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a filling made of a web-like fiber aggregate made of a large number of continuous filaments made of a thermoplastic synthetic polymer, which has good bulk, does not lose its shape, and has excellent heat retention. A wide variety of synthetic fibers are produced and sold in large quantities as padding materials for traditional Japanese and Western comforters, as well as thermal clothing, but most of them are substitutes for cotton. There were many short fibers or stable fibers. On the other hand, some products using long fibers as a filling material are known, but the main examples are tow futons made by laminating and opening tow, which is the raw material for producing stable fibers. In this tow futon, the arrangement of the long fibers that make up the tow is limited to a certain direction, and the fibers are not spread uniformly enough, so when stuffed with cotton, it tends to lose its shape and break, similar to short fibers. Moreover, tow futons lack drapability and are complicated to form into cotton pads because they require a composite structure in which the tow is preformed into a wave shape and then joined with fabric. Another example of using long fibers as a stuffing material is to randomly stretch cotton strips of a certain fineness discharged from a regular orifice-type spinning machine using high-pressure, high-speed air. There is a so-called spunbond spun long fiber futon cotton that is made into a web, but it not only has the disadvantage of requiring a huge amount of energy and increasing costs due to manufacturing problems, but also has the disadvantage that fiber bundles that move at high speed are required. Since the fibers are opened, the drawback of web unevenness cannot be avoided. Therefore, the present inventors have developed a web-like fiber aggregate that is inexpensive, has fewer web irregularities, and has the characteristics of the long-known mawata futon with less deformation and cotton breakage. As a result of intensive research with a focus on manufacturing, we have completed the filling of the present invention. That is, the filling of the present invention, in summary, consists of a web-like fibrous assembly consisting of a large number of continuous filaments of a thermoplastic synthetic polymer, (i) the filaments having an irregular pattern along their length; The cross-sectional area of the filament changes periodically, and (ii) the coefficient of variation of the cross-sectional area of the filament [CV(F)]
is in the range of 0.05 to 1.0, (iii) the average fineness of the filaments is in the range of 0.5 to 20 deniers, and (iv) each filament is partially bonded to each other. To explain the filling of the present invention in more detail, the above-mentioned web-like fiber aggregate has a bulk density in the range of 0.005 to 0.05 g/cm ³ and a bulk retention rate of 70% or more,
In addition, most of the filaments constituting the web-like fiber aggregate are within the range of 0.1 to 30 deniers and have a gentle fineness distribution, and the filaments have a crimp rate of 15% or more and a ~20
It is characterized by having an average number of crimps of 1,000 cm/inch. Conventionally, it has been impossible to manufacture a filling having the characteristics described above, which is composed of a web-like fiber aggregate consisting of a large number of continuous filaments.
Patent application filed in 1983 by some of the inventors
No. 38993 (filed on March 28, 1982) The packing flux (Pf) stated in the specification is 10 ^-4 ~
Since high-density fiber aggregates in the range of 10 ^-1 can now be easily produced, it is possible to produce webs with less unevenness by simply converting the high-density fiber aggregates into webs through a simple process. It has now become possible to produce fiber aggregates easily and at low cost. Packing flux (Pf) referred to here
represents the ratio of the total cross-sectional area of all fibers in the fiber bundle to be spun to the area of the fiber forming region of the spinneret; Here, SO: Area of fiber forming region (cm ² ) Ai: Cross-sectional area of individual filamentary fiber (cm ² ) The density of fibers spun (discharged) from the fiber forming region, that is, a measure of high-density spinning performance. By the way, when we compare the packing flux of the aforementioned spunbond type long-staple futon cotton, we can easily understand the high density from the fact that it shows a value smaller than 10 ^-4 . Therefore, the first object and advantage of the present invention is to
The object of the present invention is to provide a new type of web-like fiber aggregate that cannot be obtained by known methods for obtaining web-like products from thermoplastic synthetic polymers. A second object and advantage of the present invention is that the fiber cross-sectional shape is similar to that of a natural fiber web, e.g. The object of the present invention is to provide a web-like fiber assembly consisting of a large number of continuous filaments. The third object and advantage of the present invention is that each filament is partially joined three-dimensionally, and the entire web is integrally molded, resulting in a web-like fiber with good bulk and high bulk retention. The goal is to provide a collective. The fourth object and advantage of the present invention is that most of the filaments constituting the web-like fiber aggregate are within the range of 0.1 to 30 deniers, have a gentle fineness distribution, and are random and irregular. The object of the present invention is to provide a filler which is made of a web-like fiber aggregate having a crimped material and which has good bulk, bulk retention and heat retention. The present invention will be explained in more detail below. First, a general method for producing a web-like fiber bundle consisting of a large number of continuous filaments made of the thermoplastic synthetic polymer of the present invention will be outlined. The web-like fiber aggregate of the present invention can be produced by the manufacturing method described in the specification of Japanese Patent Application No. 55-38993 (filed on March 28, 1982), which was previously proposed by some of the inventors. A starting fiber bundle was obtained. Specifically, when producing a filamentous fiber bundle by extruding a melt of a thermoplastic synthetic polymer through a spinneret having a large number of slits, the melt is extruded from a spinneret adjacent to the melt discharge side of the spinneret. The melt is extruded from a certain slit through the slit or recessed area (valley) existing between the slits that are discontinuously protruded (mountains). Extruding the melt from a spinneret that can communicate with the melt extruded from other slits adjacent thereto, and at this time supplying a cooling fluid to the melt discharge surface of the spinneret and its vicinity. A precursor to the web-like aggregate is obtained by collecting the melt extruded through the slits while cooling and converting the melt into a number of separate fibrous rivulets which solidify. A filamentary fiber bundle was obtained. As explained above, this method is a conventional method in which the discharge surface of the polymer melt is a smooth surface, and discharge holes (orifices) for the melt are independently bored in a regular array. This is fundamentally different from the method of manufacturing fibers in which the melt is extruded from a spinneret. According to this method, for example, if the spinneret has a thick denier of about 30 to 100 deniers, there will be about 50 to 150 filaments per cm ² of the spinneret, or if the average fineness of the spinneret is about 1 to 5 deniers, About 100~600
books, and if the average fineness is less than about 1 denier
Filament-like fiber bundles of 600 to 1,500 or more fiber bundles can be produced continuously and stably. The filamentous fiber bundles having tens of thousands of deniers to hundreds of thousands of deniers thus obtained are then continuously rolled with a wide roller to approx.
The fiber bundle is heated or cold stretched within the range of 1.1 times to about 3.5 times depending on the material properties, and the individual filaments are separated by the naturally generated static electricity. While maintaining the opened state, the filamentous fiber bundle is randomly opened while overfeeding the filamentous fiber bundle by a factor of 2 to 10 so as to partially overlap with respect to the traveling direction of the filamentary fiber bundle. As a result, a web-like fiber aggregate serving as a representative example of the present invention was obtained. In order to eliminate web unevenness in the web-like fiber aggregate as much as possible, when overfeeding the filament-like fiber aggregate 2 to 10 times in the traveling direction so as to overlap it, a constant It is desirable to provide a space of 10,000 KV and apply ten electric charges at a high voltage of about 20,000 KV to about 50,000 KV within the space. In addition, the randomly opened bulky web is
The web-like fibers are held in a porous general conveyance belt with an interval of 10 cm to 30 cm, and air jet pulses are discharged from numerous air jet nozzles arranged above and below the porous general conveyance belt. When the fiber entanglement of the aggregate was increased in the web thickness direction and then heat-treated, the web-like fiber aggregate was bulky and had good bulk retention. Fabric weight of the web-like fiber aggregate (g/m ² )
can be controlled within a desired range by the weight of the polymer discharged from the above-mentioned uneven porous die and the amount of overfeed of the molded filamentary fiber bundle. The filamentous fiber bundle obtained by the method outlined above has the following properties:
Packing flux (Pf) defined above
is on the order of 10 ^-4 to 10 ^-1 , preferably 2 x 10 ^-4 to 10 ^-2 , which is markedly different from the conventional melt spinning method, and although it is an extremely high-density bundle, , unlike the conventional tow condition, is characterized by the fact that the individual filaments are very close together but separated. In addition, in the process of drawing and web-forming the filament-like fiber bundle, the filament-like fiber bundle is generally fed without being nipped by rollers with wide surface grooves, so that it can be drawn with low energy. It is characterized by being constantly maintained in a state where it can be easily divided and opened. Next, the physical properties of the web-like fiber aggregate made of a large number of continuous filaments made of the thermoplastic synthetic polymer of the present invention will be described in detail. The filaments constituting the web-like fiber aggregate of the present invention include: (i) the filaments have irregular and periodic changes in cross-sectional area along their length; (ii) the filaments The cross-sectional area variation coefficient [CV(F)] is
It differs from any previously known man-made filaments or fibers in that it has the following characteristics: 0.05 to 1.0. The coefficient of variation of the filament's internal cross-sectional area [CV(F)] here refers to the variation in fineness in the length direction (axial direction) of the filament, and is the coefficient of variation of the filament's internal cross-sectional area (CV(F)). , select an arbitrary 3cm area, measure the cross-sectional area at every 1mm interval using a microscope, and
The average value (A) of the 30 cross-sectional areas and the standard deviation (σA) of the 30 cross-sectional areas are determined, and the calculation can be performed using the following formula. CV(F)=σA/A The filament constituting the fiber bundle of the present invention has the above-mentioned CV(F) in the range of 0.05 to 1.0, particularly
A range of 0.08 to 0.7, especially 0.1 to 0.5 is preferred. It is thought that such characteristics are formed by a method for producing fiber aggregates that is completely different from the conventional melt spinning method described above. The continuous filament of the present invention is characterized by having a non-circular cross-section, having an irregular periodic change in cross-sectional area along the length of the filament; It also has a change in shape. The degree of non-circularity of the cross-sectional shape of the filament is expressed by the irregularity coefficient, which is expressed as the ratio (D/d) of the maximum distance (D) between the two circumscribed parallel lines and the minimum distance (d) between the two circumscribed parallel lines. be able to. The filament of the present invention has this deformation coefficient (D/d) of at least
1.1, and most are at least 1.2. Furthermore, the filament of the present invention is characterized in that the above-mentioned deformation coefficient (D/d) changes along the length of the filament. Furthermore, this filament is expressed by the difference between the maximum irregularity coefficient [(D/d) max] and the minimum irregularity coefficient [(D/d) min] in an arbitrary range of 30 mm along its length. It is characterized in that the maximum difference in shape coefficient [(D/d) max - (D/d) min] is at least 0.05, preferably at least 0.1. Filamentary fibers having the above-mentioned characteristics were completely unknown heretofore. Morphologically, it has properties similar to natural fibers such as silk. The average fineness of the filaments constituting the web-like fiber aggregate of the present invention is in the range of 0.5 to 20 deniers, and most of the filaments are
It is characterized by having a smooth fineness distribution within the range of 0.1 to 30 deniers. The average fineness and fineness distribution of the filament described herein were measured by the following method. Randomly extract 100 filaments from the web-like fiber aggregate, align them to make a partial bundle for measurement, repeat this process to make 3 partial bundles, and measure each partial bundle. Randomly select one location in the direction of the fiber axis, cut it in the direction perpendicular to it, and take a photomicrograph of the cross section.
Cut out individual fiber cross-sections from a 2000x magnified photograph, measure the weight of each, and find the value [m (Ai)]
was converted into denier using the formula below. and individual
The fineness of the 100 filaments was averaged to determine the average fineness, and the fineness of each 100 filaments was then plotted on a graph to determine the fineness distribution. This calculation was repeated three times and averaged to measure the average fineness and fineness distribution of the filaments of the web-like fiber aggregate. (De) _i = K・[m(Ai)] [In the formula, m(Ai) is the weight value of the cut photographic fiber cross section, K is the denier (de) conversion factor, and the formula K=9×10 ⁵・It is determined by ρ/α・β. Here, α is the unit area weight (g) of the photograph, β is the area magnification of the photograph, and ρ is the specific gravity of the thermoplastic polymer, all of which are values expressed in cgs units. ] The fineness distribution of the filaments constituting the web-like fiber aggregate of the present invention will be explained in further detail. When a conventionally known web-like fiber aggregate is made by mixing filamentous fibers of different deniers obtained by the conventional orifice spinning method, the fineness distribution of the web is different at different deniers. However, since the manufacturing method of the filaments constituting the web-like fiber aggregate of the present invention is completely different from that of conventionally known ones, the fineness of the filaments is , statistically speaking, it is distributed with a certain standard difference value. Furthermore, to explain the fineness distribution in detail,
The fineness distribution often has one gentle peak, but some have multiple gentle peaks. Each filament constituting the web-like fiber aggregate of the present invention is characterized in that it is partially joined to each other. This partially joined crosslinking point is
Patent application filed in 1983 by some of the inventors
It can be adjusted by the method for producing a filament-like fiber bundle, which is a precursor of the web-like fiber collection, described in No. 38993. Furthermore, by adjusting the type of polymer, the structure of the spinneret, the spinning conditions, etc., the distance between the bonding points of the filaments can be varied from about 30 cm on average to several tens of centimeters.
It is possible to produce filament-like fiber bundles of up to 1,000 meters in length in a continuous and stable manner. These crosslinking points exist before the web-like fiber aggregate is processed with resin because the manufacturing method of the filaments constituting the web-like fiber aggregate of the present invention is completely different from conventionally known methods. However, there is no problem even if resin processing is used in combination to increase the number of bonding points between the filaments. The distance between the bonding (or bonding) points is determined by carefully removing 200 10 cm long filaments from the web-like fiber aggregate using tweezers at an arbitrary location, and then removing the 200 filaments from the web-like fiber aggregate. The number of fused joint points was actually measured and calculated using the following formula. 0.1 (m) x 200 pieces/(number of bonding points) = (distance between bonding points) The filaments constituting the web-like fiber aggregate of the present invention each have crimps of randomly different shapes. It is characterized in that the average number of crimps is in the range of 3 to 20 crimps/inch, preferably 5 to 13 crimps/inch. The crimp rate of the filaments constituting the web-like fiber aggregate of the present invention is 10% or less when the filaments have an average fineness of around 1 de, and 10% when the filaments have an average fineness of 6 to 12 de. %that's all,
Preferably it is 15% or more. The number of crimp and crimp rate of these filaments were measured in the same manner as the method for measuring cotton according to JIS standard L-1074. The web-like fiber aggregate of the present invention is 0.005 to
It is characterized by having a bulk density in the range of 0.05 g/cm ² . Furthermore, to explain the measurement method in detail, put 20 g of the web-like fiber aggregate sample in a cylindrical shape with a diameter of 10 cm into a glass beaker 1, and place 0.5 g of the web-like fiber aggregate sample on top of it.
It is characterized in that the bulk density is within the above range when a light load of g/cm ² is applied. The web-like fiber aggregate of the present invention is 0.005 to 0.05
By adjusting the bulk density in the range of g/cm ² during production, the thermal conductivity of the web-like fiber aggregate can be
0.04~0.08Kcal/mh℃, preferably 0.04~
A feature of the present invention is that it can be adjusted to fall within the range of 0.06 Kcal/mh°C. This thermal conductivity was calculated using a sample thickness of 1.5cm according to the flat plate comparison method of JIS standard A-1412.
The measurements were taken under a light load of 0.5 g/cm ² . The web-like fiber aggregate of the present invention is characterized by having a bulk retention rate of 70% or more. The web-like fiber aggregate of the present invention has a bulk retention rate of 70% or more even without adhesive treatment because there are tertiary joint points that partially join each filament to each other. However, by adding an adhesive, such as an acrylic binder, in an amount of about 5 to 10%, the number of bonding points can be doubled to increase the bulk retention rate of the web-like fiber aggregate to 75% or more, preferably. has the characteristic that it can be improved by more than 80%. The bulk retention rate described here was calculated by the following formula by measuring the bulk when a light load of 0.5 g/cm ² was applied for 5 days in the same manner as the bulk density measurement described above. Bulk retention rate (%) = 5-day light load bulk (cm ² )/initial light load bulk (cm ² ) x 100 or more, focusing on the web-like fiber aggregate of the present invention and the physical properties of the filament constituting it. Having described the details in detail, the performance and characteristics of the filling made of the web-like fiber aggregate of the present invention become clear, and it can be seen that the present invention is completely different from conventionally known fillings. As the thermoplastic polymer which is the material of the web-like fiber aggregate of the present invention, there are many polymers as shown below. (i) Polyester; aromatic dicarboxylic acids such as phthalic acid, isophthalic acid, terephthalic acid, diphenyldicarboxylic acid, naphthalenedicarboxylic acid; adipic acid,
Aliphatic dicarboxylic acids such as sebacic acid and decanedicarboxylic acid; or alicyclic dicarboxylic acids such as hexahydroterephthalic acid are used as dibasic acid components, and ethylene glycol, propylene glycol, trimethylene glycol, tetramethylene glycol, decamethylene glycol, Aliphatic, alicyclic or aromatic such as diethylene glycol, 2,2-dimethylpropanediol, hexahydroxylylene glycol, xylylene glycol
Preference is given to polyesters whose glycol component is glycol. These dihydrochloric acid components or glycol components may each be a single type or a combination of two or more types of polyester. Particularly preferred examples include polyethylene terephthalate, polytetramethylene terephthalate, polytrimethylene terephthalate, US Pat.
It is a polyester elastomer described in No. 3023192, No. 3651014, and No. 3766146. (ii) Polyamide; for example poly ε-caprolactam, polyhexamethylene adipamide, polyhexamethylene sebacamide. (iii) Polyolefin-based or polyvinyl-based polymers; for example, polyethylene, polypropylene, polybutylene, polystyrene, polyvinyl chloride, polyvinyl acetate, polyacrylonitrile, polyacrylic acid ester, or mutual copolymers thereof. (iv) Other polymers; In addition to the above-mentioned polymers (i) to (iii), polycarbonates using various bisphenols; polyacetal; various polyurethanes, polyfluorinated ethylene, and copolymerized polyfluorinated ethylene. The thermoplastic synthetic polymers mentioned above may be used alone or in a mixture of two or more. Furthermore, a plasticizer, a viscosity increaser, etc. may be added to the polymer in order to increase plasticity and melt viscosity. In addition, the polymer contains light stabilizers, pigments, heat stabilizers, which are usually used as additives for fibers,
Flame retardants, lubricants, degreasers, etc. may be added. Furthermore, polymers are not necessarily limited to linear polymers;
It may be a polymer having a partially crosslinked three-dimensional structure as long as thermoplasticity is not impaired. As mentioned above, the method for producing a uniform, high-density filament-like fiber bundle, which is a precursor of the web-like fiber assembly of the present invention, is completely different from conventionally known methods, and is made using many thermoplastic synthetic polymers. Since the web-like fiber aggregate of the present invention has the characteristic of being able to be manufactured using fibers, it also has the characteristic that the material for the web-like fiber aggregate of the present invention can be freely selected from a wide range. The web-like fiber aggregate of the present invention can be used as a filler as it is, but it may also be partially mixed with or laminated with a natural fiber web or a known synthetic fiber web to the extent that the effects of the present invention are not impaired. It's okay. Applications of the stuffing made of the web-like fiber aggregate of the present invention include stuffing for various futons such as Japanese and Western mattresses, quilts, and seat cushions, quilting, winter coats, Examples include stuffing for thermal clothing such as cold weather gear, and industrial uses such as cushioning packaging materials such as shock absorbers, but these are only examples of the application of the present invention and are limited to these. It's not a thing. The present invention will be described below with reference to Examples. However, the following examples are provided to facilitate understanding of the present invention, and are not intended to limit the present invention in any way. Example 1 Chips of polyethylene terephthalate (melting point 540〓, intrinsic viscosity [η] = 0.71) and polyethylene terephthalate (melting point 540〓, intrinsic viscosity [η] = 0.71)
1.00) of chips were fed in a fixed amount to two 30φ extruders and melted, and each was heated by a gear pump every minute.
Send 140g each to the I-type die inlet via separate piping,
At the inlet of the die, two types of molten polymers were mixed using 10 Kenics-type static mixers, and a concavo-convex porous die with a molding area of 2 cm x 50 cm (stainless steel plain woven wire mesh #45 mesh and stainless steel plain woven wire mesh #45) was mixed. The mixed polymer is discharged from a die having a two-layered structure (laminated with 70 mesh), cooled directly under the die, and taken off at a speed of 45 m/min while treating the filament fiber bundle with an oil agent, and then transferred to a direct drawing machine. Heat and stretch to approximately twice the original size without nipping.
Thereafter, the filament-like fiber bundle is over-fed by about 5 times, opened by naturally generated static electricity, and the thickness of the web-like fiber bundle is fixed with upper and lower general conveyance belts. Two of the web-like fiber aggregates thus obtained were laminated in parallel and heat-treated at 180°C to obtain a uniform web-like fiber aggregate with a basis weight of 280 g/m ² . The physical properties of the web-like fiber aggregate were as shown in Table 1, and it was a fluffy material with good texture and good bulk retention. Example 2 Chips of polyethylene terephthalate (melting point 540〓, intrinsic viscosity [η] = 1.00) and polypropylene (melting point 438〓, melt index 15) were produced using two extruders similar to those in Example 1. 140 g and 93 g per minute of each were melt-extruded, melt-mixed immediately before a die, and then drawn and formed into fibers while being cooled by an Edai. A filament-like fiber bundle was treated with an oil agent and taken off at a speed of 10 m/min using a heated cap made of stainless steel level-woven wire mesh #50 with concave and convex holes and a heated cap by applying a large current of 10 V and 100 V.
This is drawn in a direct drawing machine using a wide roller without nipping while heating and splitting the fibers to approximately 2 times the original size.Then, when opening the filamentary fiber bundle while overfeeding it by approximately 7 times, A high voltage of 35 KV is applied to electrolytically open the fibers, and immediately after that, heat treatment is performed to fuse the fibers of the split polypropylene component, which is a low melting point component, to form a joining point of the web-like fiber aggregate. A web with a good bulk retention rate as shown in Table 1 was obtained by increasing the amount. Example 3 Using an extruder similar to Example 1 and a die, chips of polyethylene terephthalate (melting point 540〓, intrinsic viscosity [η] = 1.00) and polyester elastomer (manufactured by DuPont, Hytvel 4056 (melting point 441)
The chips of 〓) are melt-extruded, melt-mixed just before the Edie, discharged from the Edie, taken out while cooling to obtain a filament-like fiber bundle coated with an oil agent, and continuously heated and stretched to about twice the size. After partially splitting, the filament-like fiber bundle was folded at intervals of 20 cm in the traveling direction to form a web. Furthermore, air jet is applied from both the upper and lower surfaces of the web-like sheet while it is being generally fed between the perforated belts.
When the fiber entanglement was extended in the thickness direction of the web using pulse, and the web-like fiber aggregate was fixed by heat treatment at 165°C, it had the physical properties shown in Table 1. A web-like fiber aggregate with high elasticity and good texture was obtained. Example 4 The heat-set web-like fiber aggregate (A) obtained in Example 3 and the filament-like fiber aggregate obtained in Example 1 were subjected to high-voltage electrospreading. The web-like fiber aggregate (B) was laminated in such a manner as (B)-(A)-(B). Next, the fibers are entangled in the thickness direction of the laminated web using an air jet pulse, and then a 7% adhesive (ethyl acrylate) is applied by spraying, followed by resin processing at 130 to 140°C. A web-like fiber aggregate with good bulk and bulk retention was obtained. Example 5 The web-like fiber aggregate (A) obtained in Example 2 before heat-setting and the web-like fiber aggregate (B) before heat-set obtained in Example 3 were combined into (A)- They were stacked in parallel so that (B) - (A). Next, after using air jet pulse to entangle the fibers in the thickness direction of the laminated web,
When heat treated at .degree. C., a web-like fiber aggregate with good texture and physical properties as shown in Table 1 was obtained. Example 6 The same laminated web as in Example 5 was obtained, but the web layer (A) and the web layer (B) were laminated in the orthogonal direction, and then the same fiber entanglement and heat treatment were performed. However, a web-like fiber aggregate with well-balanced elasticity and good feel in both the vertical and horizontal directions was obtained.

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Claims (1)

[Scope of Claims] 1 Consisting of a web-like fiber assembly consisting of a large number of continuous filaments made of a thermoplastic synthetic polymer, (i) the filaments have irregular periodic breaks along their length; (ii) The coefficient of variation of the cross-sectional area of the filament [CV(F)]
(iii) the average fineness of the filaments is in the range of 0.5 to 20 denier, and (iv) each filament is partially bonded to each other. . 2 The web-like fiber aggregate has a weight of 0.005 to 0.05 g/
Filling according to claim 1, having a bulk level in the range cm ³ . 3. The filling according to item 1 or 2, wherein the web-like fiber aggregate has a bulk retention rate of 70% or more. 4 Most of the filaments constituting the web-like fiber aggregate are within the range of 0.1 to 30 deniers and have a gentle fineness distribution. Fillings as described. 5. The filling according to any one of items 1 to 4, wherein the filament has an average number of crimps of 3 to 20 crimps/inch.