JP3986505B2 - Fiber sheet - Google Patents

Description

  The present invention relates to a fiber sheet having a cotton fiber layer on at least one side and a method for producing the same. The fiber sheet of the present invention is particularly preferably used as a sheet that comes into contact with the skin.

A bodily fluid absorbing contact material having a surface material made of a nonwoven fabric having flexibility composed of cotton fibers is known (see Patent Document 1). This surface material is manufactured by the hydroentanglement method. Therefore, this surface material has a small inter-fiber distance and a clogged structure, and the texture becomes hard. Therefore, it lacks flexibility to be used as a surface material in contact with the skin. Although it is conceivable to reduce the basis weight of the surface material as a means for increasing flexibility, it is difficult to reduce the basis weight because this surface material is composed of cotton fibers alone. Even if low basis weight is attempted, the lower limit is considered to be about 35 to 40 g / m ² . Furthermore, since the surface form of the surface material is maintained by the entanglement of only the cotton fibers, it is not easy to sufficiently increase the mechanical strength such as tensile strength. Increasing strength and decreasing basis weight are generally in a contradictory relationship.

  A method has been proposed in which natural fibers such as cotton fibers are combined with other fibers to reduce the basis weight of the cotton fibers (see Patent Document 2). In this method, a web of short fibers such as natural fibers is laminated on the upper surface of the net-like sheet, and the web fibers are entangled with each other and entangled with the net-like sheet by high-speed water flow treatment. However, due to the fact that the object of entanglement of short fibers is a net-like sheet, the entangled short fibers are clogged and the distance between the fibers is shortened. As a result, the obtained sheet is hard and lacks flexibility.

JP-A-8-24289 JP-A-60-199962

  Accordingly, an object of the present invention is to provide a fiber sheet containing cotton fibers and a method for producing the same, which has a soft texture despite its high strength.

The present invention is a fiber sheet comprising cotton fibers and two or more different types of synthetic fibers,
Two or more of the synthetic fibers form a nonwoven fabric,
Cotton fibers enter the fiber network of the nonwoven fabric and entangled with the fiber network, and on one side of the nonwoven fabric, a cotton fiber layer is formed in a state of partially entering the nonwoven fabric,
The two or more types of the synthetic fibers include a combination of the following fibers a) and b):
a) Heat-fusible fiber b) Heat-fusible fiber having a smaller fiber diameter than the heat-fusible fiber of a)
A cotton fiber web is placed on one side of the nonwoven fabric in which the fibers of a), the fibers of b), and the fibers of a) and b) are heat- sealed, and a high-pressure water stream is applied from the web side. The object is achieved by providing a fiber sheet produced by spraying.

Moreover, as a preferable manufacturing method of the fiber sheet,
only it contains the fibers of the fiber and b) of a), fiber to each other of a), b) fibers to each other, and a) of fiber and b) of the fiber and the cotton fibers on one side of the non-woven fabric that is heat-sealed of The webs of b) in the non-woven fabric are simultaneously entangled with and intertwined with the fiber network by spraying a high-pressure water stream from the web side, The manufacturing method of the fiber sheet moved to the other surface side of a nonwoven fabric is provided.

Furthermore, the present invention is a fiber sheet containing cotton fibers and two or more different types of synthetic fibers,
Two or more of the synthetic fibers form a nonwoven fabric,
Cotton fibers enter the fiber network of the nonwoven fabric and entangled with the fiber network, and each side of the nonwoven fabric is formed with a cotton fiber layer partially entering the nonwoven fabric,
The two or more types of the synthetic fibers include a combination of the following fibers a) and b):
a) Heat-fusible fiber b) Heat-fusible fiber having a smaller fiber diameter than the heat-fusible fiber of a)
A web of cotton fibers is superposed on each surface of the non-woven fabric in which the fibers of a), the fibers of b), and the fibers of a) and b) are heat- sealed, and a high-pressure water stream is fed from the web side. The fiber sheet which is manufactured by injecting is provided.

  Furthermore, the present invention provides an absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and a liquid-retaining absorbent disposed between the two sheets. An absorbent article using any one of the above fiber sheets is provided.

  Since the fiber sheet of the present invention prevents clogging of the cotton fibers that are likely to occur in the conventional cotton sheet, it exhibits a soft texture. Further, since the fiber sheet of the present invention has a gradient in capillary force from the cotton fiber layer side toward the inside of the sheet and the liquid drawing property is high, even if the fiber sheet is in contact with the liquid, the surface on the cotton fiber layer side Presents a dry sensation. Furthermore, since the cotton fiber layer in the fiber sheet of the present invention has a higher tensile strength and the like than a cotton sheet made of a single cotton fiber having the same basis weight, the cotton fiber layer can have a low basis weight. Making the cotton fiber layer have a low basis weight is advantageous from the viewpoint of increasing the flexibility of the cotton fiber layer.

  The present invention will be described below based on preferred embodiments with reference to the drawings. FIG. 1 schematically shows a longitudinal sectional structure of an embodiment of the fiber sheet of the present invention. The fiber sheet 1 is composed of a composite sheet in which a cotton fiber layer 3 partially enters one surface of a nonwoven fabric 2 made of synthetic fibers.

  The cotton fiber layer 3 is formed on one side of the nonwoven fabric 2 such that the cotton fibers 4 enter the fiber network of the nonwoven fabric 2 and the cotton fibers 4 are entangled with the fiber network. Of course, the cotton fibers 4 are entangled with each other. As shown in FIG. 1, in the fiber sheet 1, the amount of cotton fibers gradually decreases from the side where the cotton fiber layer 3 is formed toward the side where the cotton fiber layer 3 is not formed.

On the other hand, the nonwoven fabric 2 is comprised from 2 or more types of synthetic fibers, and provides the network structure for making the cotton fiber 4 entangled. 2 or more synthetic fibers contains not Awa set of fibers of the fiber and b) the following a). Furthermore, the following fiber c) may be included.
a) Heat-fusible fiber b) Heat-fusible fiber having a smaller fiber diameter than the heat-fusible fiber of a) c) Fiber that is not fused with the heat-fusible fiber of a)

  The fibers a) are used for the purpose of forming a main fiber network in the nonwoven fabric 2. Therefore, hereinafter, the fiber a) is referred to as a network forming fiber. From the viewpoint of stably and reliably forming the fiber network, it is preferable that the network-forming fiber has a relatively large fiber diameter. Specifically, it is preferably 3 to 16 dtex, particularly 4 to 10 dtex. For the same reason, the network-forming fiber is preferably composed of a highly rigid synthetic resin. For example, it is preferably composed of a composite fiber containing polypropylene or polyester as a rigid component and polyethylene or low melting point polyester as a fusion component.

  On the other hand, the fibers of b) and c) are used for the purpose of expanding the fiber space of the fiber network when the cotton fibers 4 constituting the cotton fiber layer 3 are entangled with the fiber network of the nonwoven fabric 2 ( Details of this point will be described later). Therefore, hereinafter, the fibers of b) and c) are collectively referred to as a fiber space expanding fiber.

  As the fiber of b), a fiber having a fiber diameter smaller than that of the network forming fiber is used. Specifically, the fineness (dtex) of the fiber of b) is 5 to 80%, particularly 10 to 50% smaller than the fineness (dtex) of the network-forming fiber, from the point that the fiber space of the fiber network can be expanded. preferable. Part of the fiber b) is fused with the network-forming fiber in the nonwoven fabric 2.

  As the fiber of c), a fiber that is not fused with the network forming fiber is used. “Fiber that is not fused with the network-forming fiber” does not inherently have a fusing property, and therefore has a fiber that cannot be fused with the network-forming fiber, and a fusing property. In the manufacturing process of the nonwoven fabric 2, the process of fusing with the network-forming fibers is not performed, and as a result, both the fibers that are not fused with the network-forming fibers are included. The fiber of c) is different from the fiber of b) described above, and no particular relationship is required between the fiber diameters of the network-forming fibers. As the fiber of c), a fiber composed of a synthetic resin having a higher melting point than the synthetic resin constituting the network forming fiber, for example, a single resin composed of a synthetic resin such as polyester, polypropylene, ethylene-propylene copolymer, polyamide, etc. Side-by-side type composite fiber or core-sheath type composite fiber (such fiber is generally heat-fusible) composed of a combination of two or more kinds of fibers and the synthetic resin, and has inherently heat-fusible properties. Non-fibers such as rayon. Particularly preferred as the fiber of c) is a latent crimpable fiber in which crimps are developed. When this fiber is used, there is an advantage that the fiber sheet 1 is less likely to fall off, and the fiber sheet 1 exhibits stretchability and can be obtained with excellent flexibility, usability, and ease of use. Further, if the crimp of the latent crimpable fiber is expressed after the formation of the fiber web formed in the manufacturing process of the nonwoven fabric 2, there is also an advantage that it becomes easy to be entangled with the network-forming fiber when forming the fiber web such as carding. is there. If the latently crimpable fibers in which crimps are manifested are entangled with the network-forming fibers, the fibers will fall off when a high-pressure water stream is injected in the manufacturing process of the fiber sheet 1 (which will be described later). It becomes difficult to get up. In addition, due to the pressure of the water flow, the coil part of the latently crimpable fiber that has crimped may stretch and escape, or the weakly entangled part may come off, and the expansion of the fiber space in the fiber network is appropriate. Can be controlled.

  In the fiber sheet shown in FIG. 1, two types of synthetic fibers, that is, a network forming fiber I and one type of fiber space expanding fiber II are used. Of course, two or more kinds of fiber space expanding fibers II may be used. For example, the fiber of b) and the fiber of c) can be used in combination. In FIG. 1, in order to emphasize that a bulky fiber network is formed by the network-forming fibers I, the network-forming fibers I are schematically shown as vertically long ellipses.

  As shown in FIG. 1, the fiber space expansion fiber II is unevenly distributed on the side opposite to the side on which the cotton fiber layer 3 is formed. Due to this uneven distribution, when the cotton fibers 4 constituting the cotton fiber layer 3 are entangled with the fiber network of the nonwoven fabric 2, the fiber space of the fiber network is expanded (this will be further described later).

  When the fiber sheet 1 of the present embodiment has the above configuration, the fiber sheet 1 mainly exhibits the following advantageous effects (a) to (c).

(A) In the cotton fiber layer 3, the inter-fiber distance between the cotton fibers 4 constituting the same is increased, and the clogging of the cotton fibers 4 that is likely to occur in the conventional cotton sheet is prevented. As a result, the cotton fiber layer 3 exhibits a soft texture. Specifically, the cotton fiber layer 3 is a fiber compared to a cotton sheet obtained by hydroentanglement using the same kind of cotton fiber (any cotton sheet manufactured under conditions that can increase the distance between fibers as much as possible). The distance between them is large. The flexibility of the fiber sheet 1 can be evaluated by the method described below.

The flexibility of the fiber sheet 1 is evaluated using a KES compression test apparatus (KES-FB3, manufactured by Kato Tech). The initial thickness T ₀ (thickness under 0.5 gf / cm ² load) in the evaluation with the maximum load value of 49 cN / cm ² (50 gf / cm ² ) as the maximum load value by the device, and the thickness at the maximum load as T A value of (T ₀ −T) / T ₀ is preferably from 0.5 to 0.9 from the viewpoint of improving flexibility (cushioning property) due to the fact that the fibers are not clogged.

(B) Since the cotton fiber 4 has penetrated into the inside of the nonwoven fabric 2, when it sees as the fiber sheet 1 whole, the fiber quantity gradually goes to the thickness direction center of the fiber sheet 1 from the side in which the cotton fiber layer is formed. It is increasing. That is, the inter-fiber distance gradually decreases from the side on which the cotton fiber layer is formed toward the center of the fiber sheet 1 in the thickness direction. As a result, the capillary force gradually increases from the side on which the cotton fiber layer is formed toward the center in the thickness direction of the fiber sheet 1. That is, the capillary force has a gradient. As a result, the drawability of the liquid from the side on which the cotton fiber layer is formed to the inside of the sheet is enhanced, and even if the fiber sheet 1 comes into contact with the liquid, the surface on the side on which the cotton fiber layer is formed is dry. Presents. When the conventional cotton sheet comes into contact with the liquid, the surface of the cotton sheet has a wet sensation due to the liquid absorbency and hygroscopicity specific to cotton. However, the fiber sheet of the present invention does not cause such inconvenience.

(C) Since the cotton fiber layer 3 is partially in the nonwoven fabric 2, the cotton fiber layer 3 is mechanical such as tensile strength as compared with a cotton sheet made of a single cotton fiber having the same basis weight. Strength increases. This is particularly advantageous when the cotton fiber layer 3 has a low basis weight. This is because making the cotton fiber layer 3 have a low basis weight contributes to increasing the flexibility of the cotton fiber layer 3.

  The nonwoven fabric 2 contains 30 to 70 mass%, particularly 40 to 60 mass% of the network-forming fibers, and 70 to 30 mass%, particularly 60 to 40 mass% of the fiber space expanding fibers. It is preferable in that the mechanical strength can be sufficiently increased and the network can be sufficiently maintained. And it is also preferable from the viewpoint that the cotton fibers can easily enter the nonwoven fabric 2. The nonwoven fabric 2 may contain other fibers in addition to the network forming fiber I and the fiber space expanding fiber II. Examples of such fibers include split composite fibers made of a synthetic resin such as polyester, polypropylene, ethylene-propylene copolymer, and polyamide, and fibers that improve the capillary force of the nonwoven fabric 2 such as rayon and pulp. The capillary force depends on factors such as the space diameter and hydrophilicity of the nonwoven fabric 2.

  The cotton fiber layer 3 is made from a cotton fiber that is usually used in the industry. The cotton fiber layer 3 may be composed only of cotton fibers or may contain a small amount of other fibers. Examples of such fibers include rayon fibers, pulp fibers, and heat-fusible fibers.

The basis weight of the nonwoven fabric 2 in the fiber sheet 1 is 15 to 80 g / m ² , in particular 25 to 60 g / m ² , and can sufficiently form a fiber network entangled with the cotton fibers 4 and the entire fiber sheet 1. This is preferable from the viewpoint of securing strength. On the other hand the basis weight of the cotton fiber layer 3, in terms of points and manufacturing costs to ensure sufficient flexibility, 5 to 30 g / m ^2, it is particularly preferably 10 to 20 g / m ^2. The basis weight of the entire fiber sheet 1, from the viewpoint of handling properties and texture, 25~100g / m ^2, it is preferred that particularly 35~80g / m ^2.

  The fiber sheet 1 is suitably used as a contact with the skin, for example, a surface sheet of an absorbent article, a make-up removal sheet, a towel, a wet wiping sheet, a dishwashing sheet, and the like. In addition, when using for the use which touches human skin, the fiber sheet 1 is used so that the cotton fiber layer 3 side may contact skin.

  For example, when the fiber sheet 1 is used as a top sheet of an absorbent article, the absorbent article includes a fiber sheet 1 as a top sheet, a liquid-impermeable back sheet, and a liquid interposed between the two sheets. And a holding absorber. The top sheet is the wearer's skin facing surface, and the back sheet is the clothing facing surface. As the back sheet, various thermoplastic resin films, laminates of the film and nonwoven fabric, and the like are used. As the absorbent body, a laminated body of a superabsorbent polymer and fluff pulp, paper containing the superabsorbent polymer, or the like is used. Examples of the absorbent article having such a configuration include sanitary napkins, panty liners, incontinence pads, disposable diapers, and the like. When the fiber sheet 1 is used for such an application, as described above, the fiber sheet 1 is absorbed and incorporated into the article so that the cotton fiber layer 3 side faces the wearer's body. The absorbent article using the fiber sheet 1 as a top sheet has a comfortable feeling due to the soft texture of the fiber sheet 1. Moreover, due to the high drawability of the liquid by the fiber sheet 1, the skin facing surface of the absorbent article is kept dry, and this also improves the feeling of wearing the absorbent article.

Next, the preferable manufacturing method of the fiber sheet 1 shown in FIG. 1 is demonstrated. First, the nonwoven fabric 2 is manufactured. The nonwoven fabric 2 can be manufactured according to a normal nonwoven fabric manufacturing method. A particularly preferable production method is an air-through method or an airlaid method which is a production method capable of forming a bulky fiber network. For example, when the nonwoven fabric 2 is manufactured by the air-through method, a raw fiber in which network forming fibers and fiber space expanding fibers are blended at a predetermined ratio is opened using a card machine to manufacture a web. Next, hot air heated to a predetermined temperature is blown onto the web to fuse the intersections of the fibers. In this case, relates to textiles in which b) a fiber space expanding fiber network forming fibers to each other, the fiber space expanded fibers to each other, and a network-forming fibers and fiber space larger fibers to fuse. Thereby, the nonwoven fabric 2 is obtained. When the latent crimpable fiber is used in combination as the fiber of c), after the hot air is blown, the nonwoven fabric 2 is heated to a temperature equal to or higher than the crimp expression temperature of the latent crimpable fiber, so that the latent crimpable fiber is coiled. Shrink. By this crimping, a part of the network forming fiber is taken into the coil of the crimped latent crimpable fiber. In the nonwoven fabric 2 manufactured as described above, the network forming fibers and the fiber space expanding fibers are uniformly distributed. That is, each fiber is not unevenly distributed.

  Apart from the production of the nonwoven fabric 2, a web of cotton fibers is produced. The web is obtained by opening cotton fibers with a card machine.

  The obtained cotton fiber web is placed on the nonwoven fabric 2. This state is shown in FIG. In FIG. 2, the nonwoven fabric 2 is unwound from the raw fabric 2 ′ and conveyed by an endless belt 5 made of a wire mesh. A cotton fiber web 3 ′ is superimposed on the nonwoven fabric 2 being conveyed. A high-pressure water stream is jetted from the cotton fiber web 3 ′ side using the jet nozzle 6 in a state where both are superposed. This state is schematically shown in FIG.

As shown in FIG. 3, in the cotton fiber web 3 ′ overlapped on the nonwoven fabric 2 by jetting high-pressure water flow, the cotton fibers 4 are entangled, and the constituent fibers of the cotton fibers 4 and the nonwoven fabric 2, that is, fibers Entanglement with the network. In this case, in the non-woven fabric 2, the network forming fiber I maintains the fiber network even when subjected to the pressure of the high-pressure water stream, but the fiber space expansion fiber II receives the pressure of the high-pressure water stream and is the bottom side, that is, the cotton fiber. The web 3 'is forcibly moved to the side opposite to the surface on which the web is superimposed. In other words, it is unevenly distributed. Specifically, when the fiber space expanding fiber II is composed of the fiber of b), the fiber of b) is a thin fiber and has few fusion components, so that the heat fusion of the fiber of b) and the network forming fiber I is performed. Is weak, so the fusion point of both fibers is easily destroyed by the pressure of the high pressure water stream. As a result, the fibers of b) are forced to move. On the other hand, when the fiber of c) is used together as the fiber space expanding fiber II, the fiber of c) is not thermally fused with the network forming fiber I, and therefore is forcibly moved by the pressure of the high-pressure water stream. When the fiber of c) is composed of a latently crimpable fiber in which crimp is developed, as described above, a part of the network-forming fiber I is taken into the coil of the crimped latent crimpable fiber. In addition, since the coil portion is stretched, the latent crimpable fiber does not move excessively even under the pressure of a high-pressure water stream. As a result, there is an advantage that the movement of the latent crimpable fiber is controlled and a fiber space composed only of the network forming fiber I is appropriately formed as described later. In other words, when the latent crimpable fiber in which crimp is developed is used as the fiber of c), the latent crimpable fiber is moved by the extension of the coil portion by the water flow, and the fiber formed by the network forming fiber I Although the space is moderately formed, the latent crimpable fiber returns to the position before the movement or a position in the vicinity thereof by the contraction of the coil portion thereafter, so that it is not excessively unevenly distributed.

  As a result of the movement of the fiber space expanding fiber II, the portion where the fiber space expanding fiber II has moved and no longer exists forms a fiber network composed only of the network forming fibers I. That is, the fiber space of the said part becomes larger than before receiving the pressure of a high-pressure water flow. In other words, the inter-fiber distance in the fiber space of the part is large. The cotton fibers 4 can easily enter the enlarged fiber space and easily entangle with the fiber network. It is extremely difficult to secure a sufficient fiber space by configuring the nonwoven fabric 2 only from the network forming fiber I without using the fiber space expanding fiber II. As described above, in the present invention, a sufficient fiber space can be ensured for the first time by using together the network forming fiber I constituting the fiber network and the fiber space expanding fiber II movable by the pressure of the high-pressure water flow. As a result, the cotton fibers 4 can sufficiently enter the nonwoven fabric 2 and be entangled.

  In this way, the cotton fiber layer 3 made of the cotton fibers 4 is formed on one side of the nonwoven fabric, and the fiber sheet 1 is obtained.

  As described above, in the present invention, the fiber space expansion fiber II is largely returned to the vicinity of the original position of the fiber that is unevenly distributed by the water flow and the fiber that is moved by the water flow such as the crimped latent crimpable fiber. Uses fibers that are not unevenly distributed. When the former type of fiber is used, there is an advantage that a capillary gradient is formed in the fiber sheet 1. When the latter type of fiber is used, there are advantages that there is little dropout of the fiber and that the fiber sheet exhibits stretchability.

  Next, another embodiment of the present invention will be described with reference to FIG. In this embodiment, only the points different from the above-described embodiment will be described, and the description in detail regarding the above-described embodiment will be appropriately applied to points that are not particularly described. Further, in FIG. 4, the same members as those in FIG.

  As shown in FIG. 4, the fiber sheet 10 of this embodiment is comprised from the composite sheet | seat in which the cotton fiber layers 13 and 13 each entered each surface of the nonwoven fabric 12 which consists of synthetic fibers. In the fiber sheet 10, the amount of the cotton fibers 4 gradually decreases from the side where the cotton fiber layers 13, 13 are formed toward the center in the thickness direction of the fiber sheet 10. Moreover, when it sees in the whole fiber sheet 1, the amount of fibers is increasing toward the center of the thickness direction of the fiber sheet 10 from the side in which each cotton fiber layer 13 and 13 is formed. That is, the inter-fiber distance gradually decreases from the side where the cotton fiber layers 13 and 13 are formed toward the center in the thickness direction of the fiber sheet 10. As a result, the capillary force gradually increases from the side where the respective cotton fiber layers 13 and 13 are formed toward the center in the thickness direction of the fiber sheet 10. That is, the capillary force has a gradient. As a result, the drawability of the liquid from the side on which the respective cotton fiber layers 13 and 13 are formed into the sheet becomes high, and even if the fiber sheet 1 comes into contact with the liquid, the surface of the fiber sheet 1 exhibits a dry feeling. .

  Since the fiber sheet 10 of this embodiment has the cotton fiber layer 13 formed on both surfaces thereof, either side may be used so as to contact the skin.

  The present invention is not limited to the embodiment. For example, in the embodiment shown in FIG. 1, the surface on the side where the cotton fiber layer 3 is not formed is shown so that no cotton fiber exists, but the surface on the side where the cotton fiber layer 3 is not formed is shown. Cotton fibers may be present.

It is a schematic diagram which shows the longitudinal cross-section of one Embodiment of the fiber sheet of this invention. It is a figure which shows the process of manufacturing the fiber sheet shown in FIG. Is a schematic view showing a state in which entangling a web of cotton fibers in nonwoven fabric. It is a schematic diagram which shows the longitudinal cross-section of another embodiment of the fiber sheet of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fiber sheet 2 Nonwoven fabric 3 Cotton fiber layer 4 Cotton fiber

Claims (11)

A fiber sheet containing cotton fibers and two or more different types of synthetic fibers,
Two or more of the synthetic fibers form a nonwoven fabric,
Cotton fibers enter the fiber network of the nonwoven fabric and entangled with the fiber network, and on one side of the nonwoven fabric, a cotton fiber layer is formed in a state of partially entering the nonwoven fabric,
The two or more types of the synthetic fibers include a combination of the following fibers a) and b):
a) Heat-fusible fiber b) Heat-fusible fiber having a smaller fiber diameter than the heat-fusible fiber of a)
A cotton fiber web is placed on one side of the nonwoven fabric in which the fibers of a), the fibers of b), and the fibers of a) and b) are heat- sealed, and a high-pressure water stream is applied from the web side. A fiber sheet produced by spraying.   The fiber sheet according to claim 1, wherein the nonwoven fabric contains 30 to 70 mass% of the fiber a) and 70 to 30 mass% of the fiber b).   The fiber sheet according to claim 1 or 2, wherein the amount of cotton fibers gradually decreases from the side where the cotton fiber layer is formed toward the side where the cotton fiber layer is not formed. The fiber sheet according to any one of claims 1 to 3, further comprising the following fiber c), wherein the fiber c) is a latent crimpable fiber in which crimps are expressed.
c) A fiber that is not fused with the heat-fusible fiber of a)   The fiber sheet according to any one of claims 1 to 4, wherein the inter-fiber distance gradually decreases from the side on which the cotton fiber layer is formed toward the center in the thickness direction of the fiber sheet.   The fiber sheet according to any one of claims 1 to 5, wherein the cotton fiber layer has a greater inter-fiber distance than a cotton sheet obtained by hydroentanglement using the same kind of cotton fibers.   The fiber sheet according to any one of claims 1 to 6, wherein the fibers of b) are unevenly distributed on the side where the cotton fiber layer is not formed. It is a manufacturing method of the fiber sheet according to claim 1,
only it contains the fibers of the fiber and b) of a), fiber to each other of a), b) fibers to each other, and a) of fiber and b) of the fiber and the cotton fibers on one side of the non-woven fabric that is heat-sealed of The webs of b) in the non-woven fabric are simultaneously entangled with and intertwined with the fiber network by spraying a high-pressure water stream from the web side, The manufacturing method of the fiber sheet moved to the other surface side of a nonwoven fabric. A fiber sheet containing cotton fibers and two or more different types of synthetic fibers,
Two or more of the synthetic fibers form a nonwoven fabric,
Cotton fibers enter the fiber network of the nonwoven fabric and entangled with the fiber network, and each side of the nonwoven fabric is formed with a cotton fiber layer partially entering the nonwoven fabric,
The two or more types of the synthetic fibers include a combination of the following fibers a) and b):
a) Heat-fusible fiber b) Heat-fusible fiber having a smaller fiber diameter than the heat-fusible fiber of a)
A web of cotton fibers is superposed on each surface of the non-woven fabric in which the fibers of a), the fibers of b), and the fibers of a) and b) are heat- sealed, and a high-pressure water stream from the web side. A fiber sheet that is manufactured by spraying.   The fiber sheet according to claim 9, wherein the amount of cotton fibers gradually decreases from the side on which each cotton fiber layer is formed toward the center in the thickness direction of the fiber sheet.   In an absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and a liquid-retaining absorbent disposed between the two sheets, the top sheet is the claim 1 or claim. Item 10. An absorbent article using the fiber sheet according to Item 9.

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