JP2015231501A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article including an absorber having both of durability and flexibility.SOLUTION: A vertically-long absorbent article 1 includes: a liquid-permeable top sheet 2; a liquid-impermeable back sheet 3; and an absorber 4 with liquid retention property, provided between the top sheet and the back sheet. The absorber contains pulp fibers and synthetic fibers and includes crimp portions 9 scattered thereon. An average length of the synthetic fibers is longer than a maximum distance between crimp portions that is the longest among distances between one crimp portions and nearest adjacent crimp portions.

Description

  The present invention relates to an absorbent article. More specifically, the present invention relates to an absorbent article such as a sanitary napkin.

  In an absorbent article having a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent layer provided between both sheets, the absorbent layer is a synthetic fiber, a cellulosic fiber, and a water-absorbing material that do not swell in water It is made of a synthetic resin, and the absorbent layer is heat-fused by passing through a heating roll or irradiating infrared rays with hot air to heat-synthesize synthetic fibers (Patent Document 1). . In the absorbent article described in Patent Document 1, even when the pulp fiber absorbs liquid under the wet condition, the shape of the absorbent body is easily maintained due to the presence of the synthetic fiber, and the absorbent body is heat-treated. As a result, synthetic fibers are bonded to each other, and a strong absorbent body is formed without a core wrap material such as a tissue.

JP-A-8-289903

However, a material obtained by heat-sealing synthetic fibers by heat treatment such as hot air is insufficient from the viewpoint of flexibility, although the durability of the absorber can be obtained. On the other hand, for those not thermally fused, flexibility is obtained, but in terms of durability, it is insufficient.
An object of the present invention is to provide an absorbent article in which an absorbent body has both durability and flexibility.

  The inventors of the present invention have an absorbent article in which the absorbent body has both durability and flexibility by interspersing the crimped portion with the absorbent body and making the distance between adjacent crimped portions shorter than the length of the synthetic fiber. And the present invention has been completed.

  The present invention is a vertically long absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and a liquid-retaining absorbent provided between the top sheet and the back sheet. The absorber includes pulp fibers and synthetic fibers, and the crimping portions are dotted on the absorber, and the maximum crimping is the largest of the distances between the crimping portion and the nearest crimping portion. The average length of the synthetic fiber is longer than the distance between the parts.

  In the absorbent article of the present invention, the absorbent body has both durability and flexibility.

FIG. 1 is a partially broken plan view of one embodiment of the absorbent article of the present invention. 2 is a schematic cross-sectional view taken along the line II ′ of FIG. FIG. 3 shows an example of a 60-degree staggered arrangement of crimping parts. FIG. 4 shows an example of deformation of the square staggered arrangement of the crimping portions. FIG. 5 is a schematic view of a state in which the synthetic fiber is fixed to the crimping part. FIG. 6 is a schematic view showing a state in which the synthetic fiber is continuous through the crimping portion. FIG. 7 is an example of an absorbent body in which an elongated crimping part is arranged. FIG. 8 is a schematic cross-sectional view of an absorbent article including a synthetic fiber sheet. FIG. 9 is a diagram showing an example of an absorbent article manufacturing apparatus according to the present invention.

The present invention will be described below with reference to the drawings, but the present invention is not limited to those shown in the drawings.
The present invention is a vertically long absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and a liquid-retaining absorbent provided between the top sheet and the back sheet. The absorbent body is a sheet containing pulp fiber, synthetic fiber, and water-absorbing polymer, and the absorbent body is dotted with crimping parts, and the distance between the crimping part and the nearest crimping part is the same. The average length of the synthetic fiber is longer than the maximum distance between the crimping parts having the maximum distance.

  FIG. 1 is a partially cutaway plan view of an embodiment of an absorbent article of the present invention, and FIG. 2 is a schematic cross-sectional view taken along the line II ′ of FIG. The absorbent article 1 shown in FIG. 1 is a sanitary napkin. The absorbent article 1 includes a liquid-permeable top sheet 2 provided on the skin side, a liquid-impermeable back sheet 3 provided on the clothing side, and a liquid provided between the top sheet and the back sheet. The holding absorber 4 is provided and is formed substantially vertically long. Although the absorbent article 1 shown in FIG. 1 has a pair of wings 5 and 5, a wing is not essential. The absorbent body 4 is a sheet containing pulp fibers 6, synthetic fibers 7, and a water-absorbing polymer 8. The absorber 4 is dotted with crimping portions 9. The average length of the synthetic fiber 7 is longer than the maximum distance between the crimping parts having the maximum distance among the distances between the crimping part and the nearest neighboring crimping part.

  The absorber 4 is dotted with crimping portions 9. In the example shown in FIG. 1, the crimping portions 9 are scattered over the entire absorber 4, but the crimping portions 9 are not necessarily scattered throughout the absorber 4, and at least the absorption portion 9 is absorbed. It suffices that the crimping portions 9 scattered on a part of the body 4 exist. The arrangement pattern of the crimping parts 9 is not limited. For example, a 60-degree zigzag arrangement (3 dice eyes), a square zigzag arrangement (5 dice eyes), and a parallel arrangement (4 or 6 dice eyes) ) And their variations can be illustrated. The arrangement of the crimping parts shown in FIG. 1 is an example of a square staggered arrangement. FIG. 3 shows an example of a 60-degree staggered array, and FIG. 4 shows a modified example of a square staggered array.

In the present application, the maximum distance between the crimping parts refers to the distance between the crimping part and the nearest neighboring crimping part having the maximum distance. Here, the distance between the crimping part and the adjacent crimping part nearest to it is a line segment connecting a point on the outline of the crimping part and a point on the outline of the neighboring crimping part closest to the crimping part. The length of the shortest line segment.
In the 60-degree staggered arrangement of FIG. 3, when attention is paid to the crimping portion 9a, the crimping portions adjacent to the crimping portion 9a are six crimping portions 9b, 9c, 9d, 9e, 9f, and 9g. In this arrangement, the six adjacent crimping portions 9b, 9c, 9d, 9e, 9f, and 9g are all at equal intervals from the crimping portion 9a, so that the six adjacent crimping portions 9b, 9c, 9d, 9e, 9f, and 9g all correspond to the adjacent crimping part closest to the crimping part 9a. The distances between the crimping part 9a and the nearest neighboring crimping parts 9b, 9c, 9d, 9e, 9f, 9g are Lb, Lc, Ld, Le, Lf, Lg. In this arrangement, for all crimps, the distance between the nearest neighbor is the same. When the distance between all the crimping parts is the same as the nearest crimping part, the distance is the maximum distance between the crimping parts. In this arrangement, the maximum distance between the crimping parts is the length of Lb, Lc, Ld, Le, Lf, and Lg.
The arrangement in FIG. 4 is a modification of the square staggered arrangement, but the distance between the crimping part and the crimping part is different between the upper part and the lower part. Paying attention to the crimping part 9m, the adjacent crimping parts closest to the crimping part 9m are the four crimping parts 9n, 9o, 9p, 9q, and the distance between the crimping part 9h and the nearest neighboring crimping part is Ln, Lo, Lp, and Lq. Paying attention to the crimping part 9r, the adjacent crimping parts closest to the crimping part 9r are the two crimping parts 9s and 9t, and the distance between the crimping part 9r and the nearest neighboring crimping part is Ls and Lt. is there. The lengths of Ls and Lt are equal to the lengths of Ln, Lo, Lp, and Lq. Paying attention to the crimping part 9u, the adjacent crimping parts closest to the crimping part 9u are the four crimping parts 9r, 9v, 9w, 9x, and the distance between the crimping part 9u and the nearest neighboring crimping part is Lr, Lv, Lw, and Lx. Therefore, in this arrangement, the distance between the crimping part and the nearest neighboring crimping part is the length of Ln, Lo, Lp, Lq, Ls, Lt and the length of Lr, Lv, Lw, Lx. There will be two types. Since the length of Lr, Lv, Lw, Lx is larger than the length of Ln, Lo, Lp, Lq, Ls, Lt, the maximum distance between the crimping parts in this arrangement is the length of Lr, Lv, Lw, Lx It is.
In the case of the arrangement of FIG. 4, there are two types of distances between the crimping part and the nearest neighboring crimping part, but there are three or more types of distances between the crimping part and the nearest neighboring crimping part. In this case, the largest distance among the three or more types is the maximum distance between the crimping parts.

The present invention is characterized in that the average length of the synthetic fiber is longer than the maximum distance between the crimping portions. Synthetic fibers are fixed at the crimping part, but since the average length of the synthetic fibers is longer than the maximum distance between the crimping parts, one synthetic fiber can be fixed at two or more crimping parts. . Since the synthetic fiber fixed to two or more crimping parts functions as a skeleton in the absorbent body, the absorbent body is prevented from being deformed and the durability of the absorbent body is increased. Preferably, the synthetic fiber is heat-sealed at the crimping portion. Since the degree of freedom of the synthetic fiber is further reduced by heat fusion, the durability is further increased. Synthetic fibers are not fused except at the crimping portion, and the synthetic fibers are connected to each other only by the crimping portion to form a skeleton. Therefore, a flexible and durable absorbent body can be realized. Moreover, even if there are many water absorbing polymers, since the crimping | compression-bonding part is limited, it does not become hard.
The average length of the synthetic fiber is preferably 1.5 to 8 times the maximum distance between the crimping parts, more preferably 2 to 7 times, and further preferably 3 to 6 times. If the average length of the synthetic fiber is too long, the fiber-opening property of the synthetic fiber is remarkably lowered, and the absorbent body includes synthetic fibers that are not opened, and the uniformity of the absorbent body tends to be lowered.

  In addition, the average length of the synthetic fiber is measured on a glass plate with a scale of “A7.1.1 A method (standard method)” in “A7.1 Measurement of fiber length” in Annex A of JIS L 1015: 2010. It measures according to the method of measuring the length of individual fibers.

It is preferable that the distance between a crimping | compression-bonding part and the adjacent crimping | crimping part nearest to it is equal. That is, preferably, the crimping part is arranged with a certain distance from the adjacent crimping part. The distance is set according to the flexibility and thickness design of the product, the average length of the synthetic fibers to be blended, and the like. The distance is preferably 5 to 40 mm, more preferably 8 to 20 mm. If the distance is too narrow, the number and area of the crimping part will increase too much, the rigidity of the absorber containing the water-absorbing polymer will increase, the absorber will become hard, and when joined with hot air, Flexibility is also impaired. On the other hand, when the distance is too wide, it is not sufficient to suppress the thickness of the absorbent article to be attached, and the durability as the absorbent body is insufficient. The relationship with the average length of the synthetic fibers to be blended is important. When creating a structure that forms a skeleton in the absorbent body with fewer synthetic fibers, it is durable that the entire synthetic fiber in the absorbent body is connected through the crimping part. It becomes the point of grant. Therefore, the average length of the synthetic fiber needs to be set longer than the distance between the crimping portion and the nearest neighboring crimping portion. Conversely, if the average length of the synthetic fiber is long to some extent, it is possible to provide a wide interval between the crimping portions, and a more flexible absorbent body can be realized.
The interval between the crimping portion and the crimping portion is preferably uniform in the longitudinal direction and the width direction, but can be made more flexible in the longitudinal direction by making the spacing in the longitudinal direction wider than the spacing in the width direction.

  The shape of the crimping portion viewed from the thickness direction of the absorber is not particularly limited, and examples thereof include a circle, an ellipse, a square, a rectangle, a rhombus, a triangle, a star, and a heart shape, preferably a substantially circular shape. Shape. Here, the substantially circular shape refers to an elliptical shape having a ratio of a major axis to a circle or minor axis greater than 1 and 1.1 or less. When the absorbent article is twisted, it can flexibly follow any one of the width direction, the longitudinal direction, and the oblique direction when the absorbent article is twisted. In addition, it is not necessary for all the crimping parts to have the same shape, and crimping parts having different shapes may be mixed.

The shape of the crimping part is the target shape, most preferably a circular shape in order to form the absorbent body flexibly in all directions, front and rear, left and right, but depending on the conditions of use, the bonding strength In order to give strength to one side in the longitudinal direction or the width direction, a shape extending long in one side is conceivable in order to strengthen the bonding strength of the fibers. For example, in order to increase the strength in the longitudinal direction, a shape extending in the width direction is preferable in order to increase the probability that the fibers are joined in the longitudinal direction. On the other hand, in order to increase the bonding strength in the width direction, a shape extending in the longitudinal direction is employed. In FIG. 5, when the shape of the crimping part 9 is a square (a), when it is a rectangle long in the width direction of the absorber (b), when it is a rectangle long in the longitudinal direction of the absorber (c), the synthetic fiber 7 is The schematic diagram of the state fixed to the crimping | compression-bonding part 9 is shown. FIG. 6 is a schematic view showing a state in which the synthetic fiber is continuous through the crimping portion. The arrows in FIG. 5 indicate the longitudinal direction of the absorber. The area of the crimping part 9 is the same for all (a), (b) and (c). Assuming that the synthetic fiber 7 is randomly oriented in all directions in the absorbent body, the probability that the synthetic fiber 7 is fixed to the crimping part 9 is greater in (b) and (c) than in (a). Is expensive. In the case of a rectangle that is long in the width direction (b), the synthetic fiber 7 oriented in the longitudinal direction is more likely to be fixed to the crimping part 9 (see FIG. 5B). The skeleton through the part is continuously formed (see FIG. 6B), and exhibits strength in the longitudinal direction. On the other hand, in the case of a rectangle that is long in the longitudinal direction (c), the synthetic fiber 7 oriented in the width direction has a higher probability of being fixed to the crimping part 9 (see FIG. 5C). A skeleton through the fiber and the crimping part is continuously formed (see FIG. 6C) and exhibits strength in the width direction.
FIG. 7 shows an example of an absorbent body in which a long crimping part is arranged in the crotch part in the longitudinal direction and a long crimping part is arranged in the width direction in the abdominal part and the hip part. In the crotch part, a long crimping part is arranged in the longitudinal direction with emphasis on the connection in the width direction. The pressure-bonding portion long in the longitudinal direction arranged in the crotch portion also has an effect of guiding the bending when compressed in the crotch portion and also realizing the diffusion of the liquid in the longitudinal direction.

  The ratio of the area of the crimping part to the area of the absorber (hereinafter also referred to as “the area ratio of the crimping part”) is preferably 1 to 20%, more preferably 2 to 15%, and even more preferably 3 to 3. 10%. If the area ratio of the crimping part is too small, the action of the crimping part tends to hardly appear, and if the area ratio of the crimping part is too large, the wearer tends to feel the hardness of the absorbent body. Note that “the area of the absorber” and “the area of the crimping part” refer to the area when viewed from the thickness direction of the absorber.

The area of one of the crimping portion is preferably 0.5 to 10 mm ^2, more preferably 0.65～7Mm ^2, more preferably from 0.8~3mm ^2. If the area of each crimping part is too small, the protrusion of the embossing roll becomes an acute angle and the absorber may be broken. If the area of each crimping part is too large, the absorber tends to be hard.

The absorbent article of the present invention is an absorbent article that can be used to absorb bodily fluids such as menstrual blood and urine, and more specifically, sanitary napkins, urine picking pads, and the like.
The absorbent article of the present invention includes a liquid-permeable top sheet, a liquid-impermeable back sheet, and a liquid-holding absorber.

  The top sheet has a function of allowing liquid excretion from the body, such as menstrual blood and urine, to pass through the absorber provided in the lower layer, and holds the absorber by sandwiching the absorber with the back sheet. Is for. The top sheet is liquid permeable in whole or in part, and the liquid permeable region includes a resin film having a large number of liquid permeable holes, a net-like sheet having a large number of meshes, a liquid permeable nonwoven fabric, or a woven material. Formed with cloth or the like.

  The backsheet has a function of preventing liquids such as menstrual blood and urine absorbed by the absorber from leaking out, and a material that can prevent such liquid from leaking out is used. The Moreover, by using a material that does not allow liquid to pass through but is breathable, it is possible to reduce stuffiness during wearing and to reduce discomfort during wearing. Examples of such a material include a liquid-impermeable film mainly composed of polyethylene (PE), polypropylene (PP), etc., a breathable film, and a composite in which a liquid-impermeable film is laminated on one side of a nonwoven fabric such as spunbond. A sheet etc. are mentioned.

The absorber includes pulp fibers and synthetic fibers.
The fibers are randomly arranged, and the direction of the fibers extends in both the longitudinal direction and the width direction.
Examples of the pulp fiber include pulp, for example, wood pulp and non-wood pulp obtained from softwood or hardwood. Particularly preferred is a pulverized pulp having a fiber length of about 3 mm.

  Examples of the synthetic fiber include those containing a single component, for example, a single fiber, or those containing a plurality of components, for example, a composite fiber such as a core-sheath fiber. Examples of the component include polyolefins such as polyethylene (PE) and polypropylene (PP), polyesters and polyamides.

The absorber preferably further includes a water-absorbing polymer.
The water-absorbing polymer is also called SAP (superabsorbent polymer) and has a three-dimensional network structure in which a water-soluble polymer is appropriately cross-linked, and absorbs water several hundred to thousand times. It is water-insoluble, and once absorbed water does not release even when a certain pressure is applied, starch-based, acrylic acid-based, and amino acid-based water-absorbing polymers are commercially available.

The content of the synthetic fiber in the absorbent body is preferably 7.5 to 100 parts by mass, more preferably 9 to 50 parts by mass, and further preferably 10 to 30 parts by mass with respect to 100 parts by mass of the pulp fiber. It is. If the content of the synthetic fiber is too small, there is a possibility that sufficient durability cannot be imparted to the absorber. When there is too much content of a synthetic fiber, there exists a tendency for the liquid absorptivity of an absorber to become inadequate.
The content of the water-absorbing polymer in the absorber is preferably 5 to 80 parts by mass, more preferably 10 to 60 parts by mass, and further preferably 20 to 40 parts by mass with respect to 100 parts by mass of the pulp fiber. It is. If the content of the water-absorbing polymer is too small, the absorbent property of the absorber tends to be insufficient. When the content of the water-absorbing polymer is too large, the crimped portion tends to become hard.

  The average length of the synthetic fiber is not limited as long as it is longer than the maximum distance between the crimping parts, but is preferably 5 to 60 mm, more preferably 15 to 40 mm, and still more preferably 20 to 35 mm. is there. The longer the average length of the synthetic fibers, the wider the interval when providing the crimping part of the absorber, so that the area of the crimping part can be reduced, and a more flexible absorber can be realized. Become. On the other hand, if the average length of the synthetic fiber is too long, the fiber opening property of the synthetic fiber is remarkably lowered during the production, and it becomes difficult to blend with the pulp fiber.

The average length of the pulp fibers is preferably shorter than the minimum distance between the crimping parts having the smallest distance among the distances between the crimping part and the nearest neighboring crimping part. If the average length of the pulp fibers is longer than the minimum distance between the crimping portions, the softness of the absorbent body may be difficult to obtain. As long as the average length of the pulp fibers is shorter than the minimum distance between the crimping parts, the absolute value is not limited, but is preferably 0.5 to 7 mm, more preferably 1 to 6 mm, and still more preferably 2 to 2 mm. 5 mm. If the average length of the pulp fiber is too short, the durability of the absorber cannot be obtained, and there is a risk of yield deterioration such as falling out of the mesh during production.
The average length of pulp fibers means the weight-weighted average length, measured by KajaaniFiberLab fiber properties (off-line) manufactured by metso automation. L (w) value.

  Although the fiber diameter of a synthetic fiber is not limited, Preferably it is 1.5-20 dtex, More preferably, it is 1.8-15 dtex, More preferably, it is 2.0-10 dtex. If the fiber diameter is too thin, it is insufficient for imparting rigidity in terms of durability, and if the fiber diameter is too thick, there is a problem that the absorber becomes too hard.

Although the thickness of the absorber other than the pressure-bonding portion varies depending on the use, it is preferably 0.1 to 15 mm, more preferably 1 to 10 mm, and still more preferably 2 to 5 mm.
In addition, the thickness (mm) of the absorber before applying the crimping portion is a thickness meter FS-60DS (measurement surface: circle with a diameter of 44 mm, measurement pressure: 3 g / cm ² ) manufactured by Daiei Scientific Instruments Co., Ltd. In a standard state (temperature 23 ± 2 ° C., relative humidity 50 ± 5%), 5 different parts of the sample were pressurized at 3 g / cm ² , the thickness after 10 seconds was measured, and 5 It can measure by making the average value of the measured value of a location into the thickness of an absorber.
The thickness (mm) of the absorber having the crimping part can be measured by observing a cross section parallel to the thickness direction of the absorber with a microscope.

The basis weight of the absorber is preferably 40 to 900 g / m ² , more preferably 50 to 800 g / m ² , and still more preferably 100 to 500 g / m ² . This is from the viewpoint of the strength and absorbability of the absorber.
The basis weight is measured according to “6.2 Mass per unit area (ISO method)” of JIS L 1913: 2010.

Apparent density of the absorbent body is preferably 0.06~0.14g / cm ^3, more preferably 0.07~0.12g / cm ^3, more preferably a 0.08~0.1g / cm ^3. When an absorber has the ratio of the above-mentioned pulp fiber and synthetic fiber, and the said apparent density, there exists a tendency for an absorber to be excellent in liquid absorptivity.
The apparent density of the absorber can be calculated from the basis weight and thickness of the absorber.

In the absorbent article of the present invention, a synthetic fiber sheet is preferably disposed on at least one side of the absorbent body. When the synthetic fiber sheet is disposed, the crimping part is preferably formed by crimping the synthetic fiber sheet and the absorbent body together. By compressing the synthetic fiber sheet and the absorbent body together, the synthetic fiber sheet and the synthetic fiber in the absorbent body are joined through the crimping portion, so that a durable absorbent body that is difficult to delaminate can be realized.
FIG. 8 is a schematic cross-sectional view of an absorbent article including a synthetic fiber sheet. The synthetic fiber sheet 10 is disposed on the surface of the absorbent body on the top sheet side, and is preferably bonded with an adhesive. In the embodiment of FIG. 8, the synthetic fiber sheet is disposed on the top sheet side surface of the absorbent body, but may be disposed on the back sheet side surface of the absorbent body or disposed on both surfaces of the absorbent body. It may be. In the embodiment of FIG. 8, the width of the synthetic fiber sheet 10 is slightly smaller than the width of the absorber, but may be the same as the width of the absorber. The length in the longitudinal direction of the synthetic fiber sheet 10 is preferably the same as the length in the longitudinal direction of the absorbent body.
The synthetic fiber sheet is not particularly limited as long as it is a sheet composed of synthetic fibers, and examples thereof include non-woven fabrics and woven fabrics made of synthetic fibers. Examples of non-woven fabrics include spunlace nonwoven fabrics and air-through nonwoven fabrics. Can do. Synthetic fibers include polyethylene (PE), polypropylene (PP), polybutylene and other polyolefins; ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, ethylene-acrylic acid copolymer, ionomer resin; Examples thereof include polyesters such as tarate (PET), polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), and polylactic acid; single fibers and composite fibers such as polyamides such as nylon 6 and nylon 66. Synthetic fiber sheets need to be liquid permeable when placed on the top sheet side surface of the absorber, but are liquid impermeable when placed on the back sheet side surface of the absorber. There may be.

Next, the manufacturing method of the absorbent article of this invention is demonstrated.
FIG. 9 is a diagram showing an example of an absorbent article manufacturing apparatus according to the present invention.
In addition, in FIG. 9, pulp fiber and synthetic fiber are not expressed separately.
A plurality of recesses 102 extending from the peripheral surface 101a toward the center of the suction drum are formed at a predetermined pitch on the peripheral surface 101a of the rotating suction drum 101 as a mold for filling the absorbent material. When the suction drum 101 rotates and the recess 102 enters the material supply unit 103, the absorber material supplied from the material supply unit 103 is deposited in the recess 102 by the suction of the suction unit 104.
The material supply unit 103 with the hood 103a is formed so as to cover the suction drum 101, and the material supply unit 103 supplies a mixture 105 of pulp fibers and synthetic fibers to the recess 102 by air conveyance. The material supply unit 103 includes a water-absorbing polymer supply unit 107 that supplies the water-absorbing polymer 106, and supplies the water-absorbing polymer 106 to the recess 102. The mixture 105 of pulp fibers and synthetic fibers and the water-absorbing polymer 106 (hereinafter also referred to as “absorber raw material”) are deposited in the concave portion 102 in a mixed state, and the absorbent body 108 is formed in the concave portion 102.

Next, the absorbent body 108 formed in the recess 102 moves onto the carrier sheet 110 having the adhesive coated thereon from the coating machine 109.
The carrier sheet 110 will later form a synthetic fiber sheet between the absorber and the liquid impermeable layer, but in embodiments where the body fluid absorbent article does not have a synthetic fiber sheet, the liquid permeable layer, liquid impermeable A functional layer, an optional auxiliary sheet or the like can be used as a carrier sheet.
Next, the absorbent body 108 placed on the carrier sheet 110 is embossed by the pair of embossing rolls 111 and 112, and the crimping portion 9 is formed. A pair of embossing rolls can be comprised with the roll 112 and the flat roll 111 which have the convex part patterned, for example. The roll 112 having a convex portion is preferably arranged on the carrier sheet (synthetic fiber sheet) side.
Although embossing may be performed at room temperature, it is preferably performed in a heated state. When performed in a heated state, the surface temperature of the embossing roll is preferably 80 to 160 ° C, more preferably 100 to 150 ° C, and still more preferably 120 to 140 ° C. If the surface temperature of the embossing roll is too low, the synthetic fibers cannot be sufficiently bonded to each other. If the surface temperature is too high, the synthetic fibers other than the crimping portion are also melted, and the absorber becomes hard. The clearance between the tip of the convex portion of the embossing roll and the flat roll is preferably set to 0 to 1 mm, more preferably 0.01 to 0.5 mm, and still more preferably 0.05 to 0.3 mm. The embossing treatment time is preferably 0.0001 to 5 seconds, more preferably 0.005 to 2 seconds, and further preferably 0.005 to 1 second.

  Next, the top sheet 115 is bonded by a pair of rolls 113 and 114, then the back sheet 118 is bonded by a pair of rolls 116 and 117, and finally cut into the shape of the absorbent article by the cutter rolls 119 and 120. Thus, an absorbent article is obtained.

  The absorbent article of the present invention can be suitably used for sanitary napkins, urine collection pads, and the like.

DESCRIPTION OF SYMBOLS 1 Absorbent article 2 Top sheet 3 Back sheet 4 Absorber 5 Wing 6 Pulp fiber 7 Synthetic fiber 8 Water-absorbing polymer 9 Crimping part 10 Synthetic fiber sheet 101 Suction drum 102 Recessed part 103 Material supply part 104 Suction part 105 Synthesis with pulp fiber Mixture with fiber 106 Water-absorbing polymer 107 Water-absorbing polymer supply unit 108 Absorber 109 Coating machine 110 Carrier sheet 111, 112 Embossing roll 113, 114 Roll 115 Top sheet 116, 117 roll 118 Back sheet 119, 120 Cutter roll

Claims (6)

  A vertically-long absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and a liquid-holding absorbent provided between the top sheet and the back sheet, wherein the absorbent is Pulp fiber and synthetic fiber are included, and the crimping part is dotted on the absorber, and the distance between the crimping part and the nearest neighboring crimping part is the maximum distance between the largest crimping parts. Also, an absorbent article characterized in that the average length of synthetic fibers is long.   The absorbent article according to claim 1, wherein the average length of the synthetic fiber is 1.5 to 8 times the maximum distance between the crimping parts. The absorbent article according to claim 1 or 2 area of one of the crimping portion, characterized in that a 0.5 to 10 mm ^2.   The absorbent article according to any one of claims 1 to 3, wherein the synthetic fiber is heat-sealed at the crimping portion.   The synthetic fiber sheet is disposed on at least one side of the absorbent body, and the crimping portion is formed by crimping the synthetic fiber sheet and the absorbent body together. Absorbent article according to item.   The absorbent article according to any one of claims 1 to 5, wherein the shape of the pressure-bonded portion viewed from the thickness direction of the absorber is substantially circular.

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