WO2019123781A1

WO2019123781A1 - Absorbent article manufacturing method

Info

Publication number: WO2019123781A1
Application number: PCT/JP2018/037474
Authority: WO
Inventors: 利樹正木
Original assignee: ユニ・チャーム株式会社
Priority date: 2017-12-22
Filing date: 2018-10-05
Publication date: 2019-06-27
Also published as: JP6884093B2; JP2019111091A

Abstract

Provided is a method for manufacturing an absorbent article which can stably maintain the shape of compressed parts and prevent an absorbent body from hardening. This method for manufacturing an absorbent article (1) comprises: a supply step of supplying at least an absorbent body (P3) into a gap between a pair of rolls which is provided with a first roll (30) having a plurality of first protrusions (32) on the outer circumferential surface thereof and a second roll (40) having a plurality of second protrusions (42) on the outer circumferential surface thereof; and a formation step of forming a plurality of compressed parts (12) by causing each of the plurality of first protrusions and each of the plurality of second protrusions to oppose one another while inserting at least the absorbent body between the first roll and the second roll and compressing the absorbent body from both sides in the thickness direction. The first roll and the second roll are configured so that in a state in which each of the first protrusions and each of the second protrusions forming the compressed parts oppose one another, the projection of a first area (A1) of a peak portion (32t) of each first protrusion on a second area (A2) of a peak portion (42t) of the corresponding second protrusion is located within the second area.

Description

Method of manufacturing absorbent article

The present invention relates to a method of manufacturing an absorbent article.

It is known to emboss the material of construction of the absorbent article. For example, Patent Document 1 discloses a method in which two sheets are inserted between a pair of rolls, and the sheets are sandwiched and joined by the smooth outer peripheral surface of one roll and the convex portion of the other roll. It is disclosed. Further, in Patent Document 2, a method of manufacturing a non-woven fabric by inserting a web between a pair of rolls and sandwiching and joining the web in the thickness direction with the convex portion of one roll and the convex portion of the other roll. Is disclosed. In Patent Document 3, a plurality of sheets are inserted between a pair of rolls, and a plurality of sheets are held together by a large convex portion in one predetermined direction of one roll and a large convex portion in the other predetermined direction of the other roll. A method of pressure bonding is disclosed.

Japanese Patent Application Laid-Open No. 11-138636 JP 2011-137249 A JP 2008-132631 A

In order to improve the absorption performance of the absorbent article, at least an absorbent body may be formed with a pressing portion or a pressing groove.

As a method of forming a plurality of pressing parts, as in Patent Document 1, a method of using a pair of rolls including a roll having a smooth outer peripheral surface and a roll having a convex portion can be considered. In this case, the convex portion squeezes the absorber on the outer peripheral surface from one surface in the thickness direction to the other surface to form a compressed portion having a bottom portion. Since the bottom of the press is the thinnest area, the fiber density at the bottom is the highest and the bottom is the hardest area. Here, the absorber is relatively thick as compared to the plurality of sheets. For this reason, an area in which the thickness gradually decreases toward the bottom of the squeeze part is widely formed. As a result, in the area around the pressing portion, the fiber density gradually increases toward the pressing portion, and a region in which the hardness increases is generated widely. If the hardness is increased not only in the plurality of compressed parts but also in the area around the plurality of compressed parts, the absorbent body becomes hard even if the absorption performance of the absorbent article is improved, which in turn makes the absorbent article hard. And the wearer may feel discomfort. In addition, in an absorber having a thicker thickness compared to the sheet, the moving speed when moving along the roll between the portion in contact with the roll side having a smooth outer peripheral surface and the portion in contact with the roll side having a convex portion (Circumferential speed) is different. Specifically, the portion in contact with the roll side having the convex portion alternately passes through the convex portion and the concave portion between the convex portions, that is, passes through the region having unevenness. At that time, the portion in contact with the roll side having the convex portion is a portion to be squeezed by passing while being squeezed so as to enter the absorber (a portion corresponding to the convex portion, the distance from the center to the top of the roll The (radius) is relatively large by the height of the convex portion) and the portion not squeezed (portion corresponding to the concave portion, and the distance (radius) from the center of the roll to the bottom portion is relatively large by the depth of the concave portion There is a difference in speed (circumferential speed) between Here, in the roll having a convex portion, the distance (radius) from the center to the top of the convex portion is set to be equal to the radius of the roll having a smooth outer peripheral surface. As a result, the moving speed of the unsqueezed portion of the portion in contact with the roll side having the convex portion is slightly slower than the moving speed of the portion in contact with the roll side having the smooth outer peripheral surface. Therefore, the pressing portion is formed in a state in which the moving speeds of the two portions are different, and the pressing portion formed from one portion to the other portion in the thickness direction may be easily broken.

As a method of forming a plurality of pressing parts, as in Patent Document 2, a method using a pair of rolls including one roll having a convex portion and the other roll having a convex portion can be considered. In this case, a pressing portion is formed by pressing the absorbent body from both sides in the thickness direction by one convex portion and the other convex portion facing each other. By squeezing the absorber with the convex portion from both sides in the thickness direction, it is possible to suppress the formation of a hard region, to suppress the difference in moving speed, and it is possible to make the formed pressing portion less likely to collapse. However, if the number of rotations or the relative position temporarily change between one roll and the other roll, there is a possibility that the positions of the both convex portions may be relatively shifted. If so, the absorbent body can not be squeezed while the convex portions appropriately overlap in the thickness direction, so that the squeezed portion becomes small, and the shape of the squeezed portion may be easily broken.

In addition, as a method of forming a plurality of pressing parts, as disclosed in Patent Document 3, a pair of one roll having one large protrusion in a predetermined direction and the other roll having a large protrusion in the other predetermined direction The method of using a roll is considered. In this case, a squeezed portion is formed by squeezing the absorber from both sides in the thickness direction of a part of one convex part and a part of the other convex part facing each other. Here, for example, surplus portions are respectively provided in the transport direction and the transverse direction so that one convex portion and the other convex portion can properly overlap in the thickness direction even if the positions of the both convex portions are relatively shifted. It is formed. The surplus portions of the one convex portion and the other convex portion are preliminarily provided in order to cope with the positional deviation of the both convex portions. Therefore, the depression formed by the surplus portion together with the compressed portion is not necessarily a shape suitable for improving the absorption performance of the absorber, such as not having a bottom portion with a high fiber density.

The object of the present invention is to provide a method of manufacturing an absorbent article, wherein the shape of the compressed part can be stably maintained and the hardening of the absorber can be suppressed when the compressed part for improving the absorption performance is formed. It is an object of the present invention to provide a method of producing such an absorbent article.

The method for producing the absorbent article of the present invention is as follows. (1) A method of manufacturing an absorbent article including an absorbent body, which is a pair of rolls disposed facing each other and rotating in opposite directions, wherein the plurality of first convex portions are disposed on the outer circumferential surface And a supply step of supplying at least an absorber to a gap between the pair of rolls including a second roll having a plurality of second protrusions disposed on an outer peripheral surface, and a first roll and a second roll Each of the plurality of first convex portions and each of the plurality of second convex portions corresponding to each of the plurality of first convex portions facing each other while the at least the absorber is inserted therebetween. Forming the compressed body from both sides in the thickness direction to form a plurality of compressed parts, wherein the first roll and the second roll form the compressed part by the first convex part. And the second convex portion face each other, the second convex portion Projection of the first region of the top of the first convex portion to the second region of the section is configured to fit within the second region, the manufacturing method of the absorbent article.

The manufacturing method of the present absorbent article has the above configuration. Therefore, first, the compressed portion is formed by squeezing the absorber from both sides in the thickness direction with the first convex portion of the first roll and the second convex portion of the second roll, so that the respective convex portions squeeze the absorption Body thickness can be reduced. Thereby, it can suppress that a hard area | region is formed around the pressing part in an absorber. Furthermore, in the forming step, the projection of the first region of the top of the first protrusion relative to the second region of the top of the second protrusion in a state in which the first protrusion and the second protrusion face each other is the second region A first roll and said second roll configured to fit within are used. Therefore, when the first convex portion and the second convex portion face each other with the absorber interposed therebetween, the second convex portion can reliably overlap the first convex portion. Therefore, the second convex portion and the first convex portion reliably sandwich the absorber, and the compressed portion having the size of the first convex portion can be reliably formed. Thereby, the shape of a pressing part can be made hard to collapse.
Therefore, when forming the several pressing part for improving absorption performance, while being able to maintain the shape of several pressing part stably, it can suppress that an absorber becomes hard.

The method for producing an absorbent article according to the present invention includes the step (2), wherein the supplying step includes the step of laminating and supplying a surface sheet and the absorber in a gap between the pair of rolls. The manufacturing method of the absorbent article of these.
In order to improve the absorption performance, the laminate of the absorbent body and the surface sheet is supported by a roll having a smooth outer peripheral surface, and squeezed by a roll having a convex portion from the surface sheet side to squeeze the compressed portion May form. In that case, since the surface sheet is more difficult to stretch than the absorber, there is a possibility that it will be difficult to appropriately form the squeeze part as compared with the case where only the absorber is squeezed. In that case, there is a possibility that the shape of a pressing part may collapse easily. So, this manufacturing method squeezes a layered product with convex parts from the both sides by the side of an absorber and a surface sheet, and forms a pressing part. Therefore, even when forming a pressing part in the laminated body of an absorber and a surface sheet, since it is not necessary to extend a surface sheet so much at the time of pressing, the shape of a pressing part can be made hard to collapse.

In the method of manufacturing an absorbent article according to the present invention, (3) the method of manufacturing an absorbent article according to the above (1) or (2), wherein at least one of the first region and the second region includes a flat surface; May be.
The present manufacturing method has a flat surface in the region of the top of at least one of the projections. Therefore, by squeezing with the convex portion having the flat surface, the second convex portion and the first convex portion can sandwich the absorber more reliably and the squeezed portion can be formed more reliably and stably. . Therefore, the shape of the pressing portion can be made more difficult to collapse.

In the method of manufacturing an absorbent article according to the present invention, (4) in the first roll and the second roll, the plurality of first convex portions and the plurality of second convex portions are arranged in a row in the first direction. And a plurality of the rows are arranged at intervals in a second direction having a predetermined angle with respect to the first direction, according to any one of (1) to (3). It may be a method of manufacturing an absorbent article.
When the absorber is supported by a roll having a smooth outer peripheral surface on one side and squeezed by a roll having a convex portion from the other side, a plurality of convex portions are formed on the outer peripheral surface of the roll The larger the spread, the larger the difference between the moving speed of the roll-side portion having the convex portion and the moving speed of the roll-side portion having a smooth outer peripheral surface. In such a case, it becomes difficult to appropriately form the pressing portion, and the shape of the pressing portion may be easily broken. Then, this manufacturing method squeezes an absorber with a convex part from the both sides of one side and the other side, and forms a pressing part. Therefore, even when forming a plurality of pressing parts in a wide range of the absorber, it is not necessary to stretch the surface sheet so much at the time of pressing, so that the shape of the pressing parts can be made difficult to collapse.

In the method of manufacturing an absorbent article according to the present invention, any one of the above (1) to (4), wherein at least one of the first convex portion and the second convex portion has a columnar or frustum shape. The method for producing an absorbent article according to any one of the above.
In the present manufacturing method, the convex portion has a columnar or frustum shape, that is, a shape having a constant or tapered thickness from the outer peripheral surface toward the outside. Therefore, when squeezing an absorber, the load applied to the area | region of the periphery of a pressing part can be suppressed, and it can suppress more that the surrounding area | region becomes hard.

In the method of manufacturing an absorbent article according to the present invention, the cross-sectional shape from the predetermined height position to the tip of at least one of the first convex portion and the second convex portion is constant. It may be a manufacturing method of an absorptive article given in any 1 paragraph of-(5).
In the present manufacturing method, the convex portion has a constant cross-sectional shape from the predetermined height position to the tip. Therefore, when squeezing the absorber, the force for pushing out the fibers of the absorber hardly acts in the vicinity of the portion to be the bottom of the pressed portion in the absorber, so that the bottom of the pressed portion can be stably formed. Thereby, the shape of the pressing portion can be made more difficult to collapse.

In the method of manufacturing an absorbent article according to the present invention, (7) The method of manufacturing an absorbent article according to the above (6), wherein the cross-sectional shape from the predetermined height position to the tip is constant. , May be.
Since the first convex portion is smaller than the second convex portion, the tip is relatively easily worn away in the forming step. Therefore, in the present manufacturing method, the cross-sectional shape from the predetermined height position to the tip of the first convex portion is constant. Thereby, even if the tip of the first convex portion is worn, the cross-sectional shape does not change uniformly, so that the desired shape of the pressed portion can be stably formed. Thereby, the shape of the pressing portion can be made more difficult to collapse.

In the method of manufacturing an absorbent article according to the present invention, any one of the above (1) to (7), wherein at least one of the first convex portion and the second convex portion is chamfered at the corner portion of the tip. The method for producing an absorbent article according to any one of the above.
In this manufacturing method, chamfering is performed on the corner of the tip of the convex portion, that is, the corner where the side surface of the convex portion and the top surface of the convex portion intersect. Therefore, when forming a squeezed portion in the absorbent body, when the convex portion enters the absorbent body, the shear load on the absorbent body by the corner portion of the tip of the convex portion is alleviated, and cutting of fibers at the periphery of the squeezed portion Can be difficult to occur. Thereby, the shape of the pressing portion can be made more difficult to collapse.

In the method of manufacturing an absorbent article according to the present invention, (9) a projection for a hinge extending in the longitudinal direction of the absorber is further disposed on the outer peripheral surface of at least one of the first roll and the second roll The method for producing an absorbent article according to any one of the above (1) to (8) may be used.
In this manufacturing method, the same roll is provided with the convex part for a pressing part, and the convex part for hinges. Therefore, when forming the hinge and the squeezed portion in the absorber, the protrusion for the hinge continuously presses the absorber in the longitudinal direction to form the hinge and squeezes while suppressing the clearance of the absorber. It is possible to squeeze on the convex part for the part. As a result, the squeezed portion can be more stably formed at a predetermined position in a predetermined shape. Thereby, the shape of the pressing portion can be made more difficult to collapse.

In the method of manufacturing an absorbent article according to the present invention, (10) a convex portion for the hinge and a convex portion for the first hinge and a convex for the second hinge on the outer peripheral surface of the first roll and the second roll, respectively. A portion is further disposed, and in the forming step, the absorber is squeezed from both sides in the thickness direction such that the first hinge convex portion and the second hinge convex portion face each other, and the hinge is Forming the first roll and the second roll, wherein the first and second hinge projections forming the hinge and the second and second hinge projections face each other. The absorption according to (9), wherein the projection of the first hinge area of the top of the first hinge convex portion with respect to the second hinge area of the top of the convex portion fits within the second hinge area. It may be a manufacturing method of a sex article.
In this manufacturing method, in a state in which the first hinge convex portion and the second hinge convex portion are opposed to each other, the second hinge region on the top of the second hinge convex portion with respect to the second hinge region is the second convex portion of the first hinge convex portion. A first roll and a second roll are used, which are arranged such that the projection of the one hinge area falls within the second hinge area. Therefore, when the convex portion for the first hinge and the convex portion for the second hinge face each other with the absorber interposed therebetween, the convex portion for the second hinge can reliably overlap the convex portion for the first hinge. Therefore, the second hinge convex portion and the first hinge convex portion reliably sandwich the absorber, so that the hinge having the size of the first hinge convex portion can be reliably formed. Thereby, the shape of the hinge can be made hard to collapse.

According to the present invention, in the method of manufacturing an absorbent article, when forming the pressing portion for improving the absorption performance, the shape of the pressing portion can be stably maintained, and the hardening of the absorber can be suppressed. Method of manufacturing the absorbent article can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is a top view which shows the absorbent article which concerns on embodiment. It is II-II sectional drawing of FIG. It is a schematic diagram which shows the structural example of the manufacturing apparatus of the absorbent article which concerns on embodiment. It is a top view which shows the structural example of the 1st convex part of the 1st roll of the expression equipment of FIG. It is a top view which shows the structural example of the 2nd convex part of the 2nd roll of the expression equipment of FIG. It is a schematic diagram which shows the structural example of a 1st convex part and a 2nd convex part, and both relationship. It is a schematic diagram which shows the relationship example of another 1st convex part and a 2nd convex part. It is a schematic diagram which shows the other structural example of a 1st convex part and a 2nd convex part, and both relationship.

Hereinafter, a method for manufacturing an absorbent article according to the present embodiment will be described using a sanitary napkin as an example of the absorbent article. However, the present invention is not limited to the examples, and is applicable to various absorbent articles without departing from the scope of the subject matter of the present invention. Absorbent articles include, for example, panty liners, light incontinence pads, and disposable diapers.

First, the configuration of the sanitary napkin 1 according to the present embodiment will be described.
FIG. 1 and FIG. 2 are diagrams showing a configuration example of the sanitary napkin 1 according to the present embodiment. However, FIG. 1 is a plan view of the sanitary napkin 1, and FIG. 2 is a cross-sectional view taken along the line II-II of FIG. The sanitary napkin 1 has a longitudinal direction L, a width direction W, and a thickness direction T orthogonal to one another, and extends on both sides in the width direction W at a substantially central portion of the longitudinal direction L and a main body 2a extending in the longitudinal direction L A pair of

flaps

2b and 2b are provided. The sanitary napkin 1 has a longitudinal center line CL extending through the center in the width direction W and extending in the longitudinal direction L, and a width direction center line CW extending through the centers in the longitudinal direction L of the pair of

flaps

2b and 2b in the width direction W Have. In FIG. 1, the upper side is the front of the sanitary napkin 1, and the lower side is the rear of the sanitary napkin 1. The direction toward and away from the longitudinal center line CL is taken as the inward direction and the outward direction of the width direction W, respectively. The direction toward and away from the widthwise center line CW is taken as the inward direction and the outward direction of the longitudinal direction L, respectively. Viewing the sanitary napkin 1 placed on a plane including the longitudinal direction L and the width direction W from the upper side in the thickness direction T is referred to as "plan view", and a shape grasped in plan view is "plane shape" It is said. The “skin side” and the “non-skin side” mean the side closer to the skin surface of the wearer and the side farther from the skin surface in the thickness direction T when the sanitary napkin 1 is attached. These definitions are commonly used for each material of the sanitary napkin 1.

The main body 2a has a rounded rectangular shape, an elongated oval, an oval, or a similar shape. The end edges of both end edges of the main body 2a in the longitudinal direction L have a substantially semicircular or bowl-like shape. The main body portion 2 a includes a liquid-permeable top sheet 4, a liquid-impermeable back sheet 5, and a liquid-absorbent and liquid-holding absorbent body 3 disposed between the top sheet 4 and the back sheet 5. And. The absorbent 3 may include an absorbent core and a core wrap covering the same, and a plurality of absorbents or a plurality of absorbent cores may be laminated. The non-skin side surface of the top sheet 4 and the skin side surface of the absorber 3 are bonded with an adhesive or the like, and the non-skin side surface of the absorber 3 and the skin side surface of the back sheet 5 are adhesive or the like Bonded with The edge of the non-skin side surface of the top sheet 4 and the edge of the skin side surface of the back sheet 5 are bonded with an adhesive. In the area where the front sheet 4 of the main body 2a and the absorber 3 overlap in the thickness direction T, an area in contact with the wearer's excretion opening at the time of wearing, that is, the excretion opening contact area STA is set. The discharge port contact area STA is, for example, a substantially central part in the longitudinal direction L of the absorber 3 and slightly forward in the width direction W, and a length of about 1/2 to 1/3 of the entire length of the absorber 3 The width is set to about 1/2 to 1/3 of the full width. The flap portion 2b has a semicircular shape, a semielliptical shape, a trapezoidal shape or a shape similar to them.

The main body portion 2a includes a pressing groove and a pressing portion in and around the outlet contact area STA. The squeezing groove and the squeezing portion are formed by squeezing the absorber 3, preferably the top sheet 4 and the absorber 3 from the skin side and the non-skin side, that is, the top sheet 4 side and the back sheet 5 side. When the topsheet 4 and the absorber 3 are squeezed, the pressing groove and the pressing portion bond the topsheet 4 and the absorber 3 to each other. In the present embodiment, the main body portion 2 a includes the pressing groove (hinge) 11, the plurality of pressing portions 12, and the pressing grooves (hinge) 13 and 14. The pressing groove 11 is provided in a groove shape along the substantially longitudinal direction L so as to surround the discharge port contact area STA. The plurality of pressing portions 12 are provided inside the pressing groove 11 in a plurality of dots in a staggered arrangement. The squeezing groove 13 is provided on the outside on the front side in the longitudinal direction L of the squeezing groove 11, and the squeezing groove 14 is provided on the outside on the rear in the longitudinal direction L of the squeezing groove 11. However, arrangement | positioning of the several pressing part 12 inside the pressing groove 11 does not need to be a zigzag arrangement, and is arbitrary. For example, a plurality of rows are arranged in a row in an arbitrary first direction (example: width direction W), and a plurality of the rows have a predetermined angle (example: 90 degrees) with respect to the first direction (example: width direction W) It may be arranged to be spaced apart in the second direction (example: longitudinal direction L). Further, the shape and arrangement of the compressed grooves (hinges) 11, 13, 14 are not limited to this example and are arbitrary.

The thickness direction T shape and size of the pressing portion 12 are not particularly limited, and may be circular, elliptical, polygonal, star-like or the like, but in the present embodiment it is circular and the diameter is 0.5 to 3 mm, The thickness is preferably 1 to 2 mm mainly in terms of absorption performance and hardness. Compressing portions 12 has a high-density portion E _D the fibers are compressed at a high density of the absorbent body 3. Here, the size of the compressed portion 12 is assumed to refer to the size of the high density portion E _D. High density portion E _D is a first distance from the surface of the skin side in the thickness direction T of the predetermined in the absorbent body 3, formed at a position separated respectively by a second distance predetermined in the thickness direction T from the surface of the non-skin side Be done. The first distance is 30 to 70% of the thickness excluding the thickness of the high density part from the thickness of the absorber 3, preferably 40 to 60% mainly from the viewpoint of hardness, and the second distance is The remainder, ie 70 to 30%, preferably 60 to 40%. In this embodiment, the high density portion E _D is substantially the center in the thickness direction T of the absorbent body 3 (first distance is about 50%) is formed at the position of. By using the manufacturing method described below, by forming away dense portion E _D from both surfaces of the skin side and the non-skin side of the absorbent body 3 can be suppressed where the absorber 3 becomes hard. Incidentally, roll and, even when forming a compressed portion with a pair of rolls and a roll having a convex portion, the skin side of the high density portion E _D absorber 3 and non-skin having a smooth outer peripheral surface of the Patent Document 1 It can be separated from both side surfaces. In this case, unlike the present embodiment, the absorber 3 as a whole is hard, so it should be noted.

The shape and size of each of the compressed grooves (hinges) 11, 13, 14 are not particularly limited. In the present embodiment, it is in the form of a band surrounding a predetermined region, and its width is 0.5 to 4 mm, preferably 1 to 3 mm from the viewpoint of absorption performance and hardness. Each

compression grooves

11, 13 and 14 includes a high density portion _{E G} fibers of the absorbent body 3 is squeezed at high density. Here, the size of the

compressed grooves

11, 13 and 14 shall refer to the size of the high density portion _{E G.} High density portion E _G is a first distance from the surface of the skin side in the thickness direction T of the predetermined in the absorbent body 3, formed at a position separated respectively by a second distance predetermined in the thickness direction T from the surface of the non-skin side Be done. The first distance and the second distance are as described above. In this embodiment, the high density portion E _G is substantially the center in the thickness direction T of the absorbent body 3 (first distance is about 50%) is formed at the position of. By using the manufacturing method described below, by forming away dense portion E _G from both surfaces of the skin side and the non-skin side of the absorbent body 3 can be further suppressed that the absorbent body 3 becomes hard. In addition, the

pressing grooves

11, 13, 14 may have a known configuration.

The main body 2a and the pair of

flaps

2b, 2b of the sanitary napkin 1 have a plurality of fixing parts (not shown) for fixing the sanitary napkin 1 to clothes on the skin surface side of the back sheet 5. The plurality of fixing portions are covered with a release sheet (not shown). The plurality of fixing portions of the main body portion 2 a have, for example, a shape extending in a strip shape in the longitudinal direction L of the sanitary napkin 1, and are arranged at predetermined intervals in the width direction W of the sanitary napkin 1. The fixing portion of the flap portion 2 b has, for example, a shape extending in a strip shape in the longitudinal direction L of the sanitary napkin 1. The sanitary napkin 1 may further include an auxiliary sheet (not shown) that aids in the diffusion of the liquid between the top sheet 4 and the absorbent body 3.

As materials of the top sheet 4, the absorber 3, the back sheet 5, the auxiliary sheet, the fixing portion and the release sheet, known materials which can be generally used in the sanitary napkin 1 can be used. Examples of the material of the surface sheet 4 include non-woven fabric, woven fabric, synthetic resin film in which liquid permeation holes are formed, and composite sheet thereof. Examples of the non-woven fabric include natural fibers, regenerated fibers, inorganic fibers, synthetic resin fibers and the like. The basis weight of the top sheet 4 is, for example, 5 g / m ² to 100 g / m ² , preferably 20 g / m ² to 50 g / m ² . The thickness of the top sheet 4 is, for example, 0.2 to 5 mm. Examples of the material of the absorbent 3 include water-absorbent fibers such as pulp fibers and synthetic fibers, and highly absorbent polymers (SAP). The basis weight of the fibers of the absorbent body 3 is, for example, 50 to 1,500 g / m ² . The lower limit is mainly absorption performance 100 g / ^{m 2} or more is preferred from the viewpoint of, more preferably ^{^{200g / m 2, 400g / m}} 2 is more preferable. The upper limit is preferably 1300 g / ^{m 2} or less primarily in terms of fit and the like, more preferably 1100 g / ^{m 2} or less, 1000 g / ^{m 2} or less is more preferable. The basis weight of the superabsorbent polymer is, for example, 10 to 500 g / m ² , preferably 100 to 400 g / m ² . The thickness of the absorber 3 is, for example, 1 to 50 mm, preferably 5 to 30 mm. As a material of the back surface sheet 5, the nonwoven fabric which gave waterproof processing, a synthetic resin film, the composite sheet of a nonwoven fabric and a synthetic resin film, a SMS nonwoven fabric etc. are mentioned, for example. Examples of the material of the auxiliary sheet include non-woven fabric, pulp fiber and synthetic fiber. Examples of the material of the fixed part include an adhesive such as a styrene-butadiene copolymer. As a material of a peeling sheet, what coated the peeling material of a silicone resin type on the base material of paper or a resin sheet is mentioned, for example. As an adhesive agent for joining between each material, the well-known material which can be used with the sanitary napkin 1 can be used, for example, a hot-melt adhesive agent is mentioned.

Next, a method of manufacturing the sanitary napkin 1 according to the present embodiment will be described. FIG. 3 is a schematic view showing a configuration example of the manufacturing apparatus 300 of the sanitary napkin 1. The manufacturing apparatus 300 of the sanitary napkin 1 includes a first unit 300A, a second unit 300B, a third unit 300C, and a fourth unit 300D. The method of manufacturing the sanitary napkin 1 includes the first to fourth forming steps. In this example, the materials are formed and conveyed such that the longitudinal direction L of the sanitary napkin 1 is the conveyance direction MD. However, each material may be formed and transported such that the width direction W of the sanitary napkin 1 is the transport direction MD.

The first step is performed in the first unit 300A. The first unit 300A includes a fiber stacking device 110, a conveyance belt 115, a suction device 116, a coating device 301, a coating device 302, a pressing device 120, and a cutting device 130. The fiber deposition apparatus 110 includes a material feeder 113, and a rotating drum 111 having a pattern plate 112 and including a negative pressure chamber 111N and a positive pressure chamber 111P.

In the first step, first, the rotating drum 111 is rotated, and the piled material supplied from the material supply unit 113 is deposited in the groove communicating with the negative pressure chamber 111N of the pattern plate 112, and the piled body is accumulated in the groove AB is formed. Next, when the pattern plate 112 reaches the positive pressure chamber 111P together with the stacked body AB, the stacked body AB is separated from the pattern plate 112. On the other hand, the upper layer tissue sheet UT in the form of a continuous sheet is supplied from the roll WR 1 to the transport belt 115. A hot melt adhesive is applied to one side of the upper tissue sheet UT by the application device 301. Then, the piled body AB is pressed onto one surface of the upper tissue sheet UT on the transport belt 115. Thereby, the first semi-finished product P1 in which the stacked body AB and the upper tissue sheet UT are stacked is formed. The first semi-finished product P1 is conveyed by the conveyance belt 115 while being sucked by the suction device 116.

Next, the continuous tissue lower layer tissue sheet LT is supplied from the roll WR2 to the transport belt 115. The hot melt adhesive is applied to one surface of the lower layer tissue sheet LT by the application device 302. One side of the lower layer tissue sheet LT is pressed against the first semifinished product P1 on the transport belt 115. Thereby, a second semi-finished product P2 in which the lower layer tissue sheet LT and the first semi-finished product P1 (the stack AB and the upper tissue sheet UT) are laminated is formed.

Next, the second semi-finished product P2 is pressed by the pressing device 120 and cut into the shape of the absorber 3 by the cutting device 130. Thereby, the third semifinished product P3 is formed. The third semi-finished product P3 is substantially the absorbent 3 (but without the pressing portion and the pressing groove), the piled body AB is an absorbent core, and the upper and lower tissue sheets UT and LT are core wraps. In the present embodiment, the third semi-finished product P3 is a high basis weight and high thickness material having a basis weight of, for example, 400 to 1000 g / m ² and a thickness of, for example, 20 to 30 mm. The third semi-finished product P3 is delivered to the transport roll 141.

Next, the second step is performed in the second unit 300B. The second unit 300 </ b> B includes the transport roll 141, the transport belt 140, and the coating device 303. In the second step, the continuous sheet surface sheet TS is supplied from the roll WR 3 to the transport belt 140. The hot melt adhesive is applied to one surface of the top sheet TS by the applying device 303. The third semifinished product P3 supplied from the transport roll 141 is pressed against one surface of the top sheet TS. Thereby, the 4th semi-finished product P4 in which the 3rd semi-finished product P3 (absorber 3) and top sheet TS were laminated is formed. The fourth semifinished product P 4 is supplied to the squeezing device 150 by the transport belt 140.

Then, the third step is performed in the third unit 300C. The third unit 300C includes a squeezing device 150. In the third step, the fourth semi-finished product P4 is squeezed by the pair of rolls of the squeezing device 150, and the plurality of squeezed portions 12 and the squeezed

grooves

11, 13, 14 described in FIGS. 1 and 2 are simultaneously formed. . Thereby, the 5th semi-finished product P5 provided with a plurality of pressing parts 12 and

pressing grooves

11, 13, 14 is formed. The fifth semi-finished product P5 is delivered to the transport roll 160. In addition, a pressing device different from the pressing device 150 may be further provided, and the plurality of pressing parts 12 may be formed by the pressing device 150, for example, and the

pressing grooves

11, 13, 14 may be formed by another pressing device.

However, the step of supplying the fourth semi-finished product P4 to the squeezing device 150 can be considered as the supplying step of supplying at least the absorber to the squeezing device 150 (a gap between the pair of rolls). Moreover, the 4th semi-finished product P4 is squeezed with a pair of roll of the pressing device 150, and the process of forming several pressing part 12 and pressing

groove

11, 13, 14 is between the 1st roll and the said 2nd roll It can be viewed as a forming step of forming a plurality of pressing parts while inserting at least the absorber. The fourth semi-finished product P4 is not squeezed to form a plurality of pressed parts (and / or pressed grooves), but the third semi-finished product P3 is pressed to be applied a plurality of pressed parts (and / or pressed grooves) It may be formed and then the top sheet ST may be laminated on the third semi-finished product P3.

Here, the pressing device 150 will be described. The squeezing device 150 is a pair of rolls disposed facing each other and rotating in the opposite direction, the first roll 30 having a plurality of first protrusions disposed on the outer circumferential surface, and the plurality of second protrusions having an outer circumferential surface And a second roll 40 disposed on the The squeezing device 150 includes a plurality of squeezing sections 12 and a plurality of squeezing grooves in a laminate of the third semi-finished product P3 (absorbent 3) supplied between the first roll 30 and the second roll 40 and the surface sheet TS. 11, 13, 14 are formed. Further description will be given below.

4 to 7 are diagrams showing an example of the configuration of the convex portions of the pair of rolls of the pressing device 150. As shown in FIG. However, FIG. 4 is a plan view showing a configuration example of the first convex portions 31 to 34 of the first roll 30, and FIG. 5 is a plan view showing a configuration example of the second convex portions 41 to 44 of the second roll 40. FIG. 6 is a cross-sectional view showing a configuration example of the first protrusion 32 and the second protrusion 42 and the relationship between the two, and FIG. 7 is a configuration example of the other first protrusion 31 and the second protrusion 41 and It is sectional drawing which shows both relationship.

As shown in FIG. 4, on the outer peripheral surface 30W of the first roll 30, convex first convex portions 31 to 34 are formed. The first convex portions 31 to 34 have a longitudinal direction L1, a width direction W1 and a thickness direction T1 orthogonal to each other along the outer peripheral surface 30W, and the longitudinal direction L1 is along the rotational direction S1 of the first roll 30. Be placed. The first convex portion 33, the first convex portion 31, and the first convex portion 34 are disposed in order from one side to the other side along the longitudinal direction L1 (rotational direction S1). A plurality of first protrusions 32 are disposed in a staggered arrangement inside the first protrusions 31. However, the arrangement of the plurality of first convex portions 32 inside the first convex portion 31 does not have to be in a staggered arrangement and is arbitrary. For example, a plurality of rows are arranged in a row in an arbitrary first direction (example: width direction W1), and a plurality of the rows have a predetermined angle (example: 90 degrees) with respect to the first direction (example: width direction W1) It may be arranged to be spaced apart in the second direction (example: longitudinal direction L1). The first convex portions 31 to 34 may be arranged such that the width direction W1 is along the rotation direction S1 of the first roll 30.

The first convex portion 33, the first convex portion 31, the first convex portion 34 and the first convex portion 32 respectively have a pressing groove (hinge) 13, a pressing groove (hinge) 11, a pressing groove (hinge) 14 and a pressing portion 12 Used to form Therefore, the longitudinal direction L1, the width direction W1, and the thickness direction T1 correspond to the longitudinal direction L, the width direction W, and the thickness direction T, respectively. The shapes of the first convex portion 33, the first convex portion 31, the first convex portion 34, and the top portions of the first convex portion 32 as viewed in the thickness direction T1 are the compressed groove 13, the compressed groove 11, the compressed groove 14 and the compressed, respectively. The shape of the high density portion of the portion 12 as viewed in the thickness direction T is substantially the same.

As shown in FIG. 5, on the outer peripheral surface 40W of the second roll 40, convex second convex portions 41 to 44 are formed. The second convex portions 41 to 44 have a longitudinal direction L2, a width direction W2 and a thickness direction T2 orthogonal to each other along 40 W on the outer peripheral surface, and the longitudinal direction L2 is along the rotational direction S2 of the second roll 40. Be placed. The second convex portion 43, the second convex portion 41, and the second convex portion 44 are disposed in order from one side to the other side along the longitudinal direction L2 (rotational direction S2). A plurality of second protrusions 42 are disposed in a staggered arrangement inside the second protrusions 41. However, the arrangement of the plurality of second convex portions 42 inside the second convex portion 41 may not be a staggered arrangement, and is arbitrary. For example, a plurality of rows are arranged in a row in an arbitrary first direction (example: width direction W2), and a plurality of the rows have a predetermined angle (example: 90 degrees) with respect to the first direction (example: width direction W2) It may be arranged to be spaced apart in the second direction (example: longitudinal direction L2). The second convex portions 41 to 44 may be arranged such that the width direction W2 is along the rotation direction S2 of the second roll 40.

The second convex portion 43, the second convex portion 41, the second convex portion 44 and the plurality of second convex portions 42 are used to form the pressing groove 13, the pressing groove 11, the pressing groove 14 and the pressing portion 12, respectively. . Therefore, the longitudinal direction L2, the width direction W2, and the thickness direction T2 correspond to the longitudinal direction L, the width direction W, and the thickness direction T, respectively. The shapes of the second convex portion 43, the second convex portion 41, the second convex portion 44, and the top portions of the plurality of second convex portions 42 as viewed in the thickness direction T are the pressing groove 13, the pressing groove 11, and the pressing groove 14 respectively. And the shape which looked at the high density part of the pressing part 12 from thickness direction T is substantially the same as the shape expanded a little to the outer side centering on those shapes. In other words, the shapes of the tops of the second convex portion 43, the second convex portion 41, the second convex portion 44, and the plurality of second convex portions 42 as viewed in the thickness direction T2 are the first convex portion 33 and the first convex portion 33, respectively. The shapes of the tops of the convex portions 31, the first convex portions 34, and the plurality of first convex portions 32 as viewed in the thickness direction T1 are substantially the same as the shapes which are slightly expanded outward with respect to those shapes.

The first convex portion 32 and the second convex portion 42 further have the following configuration. FIG. 6A is a cross-sectional view of the first convex portion 32 and the second convex portion 42 in a state in which the first convex portion 32 and the second convex portion 42 face each other. FIG. 6B is a perspective view of the first convex portion 32 and the second convex portion 42 in FIG. 6A as viewed from the thickness direction T1 or the thickness direction T2. A state in which the first convex portion 32 and the second convex portion 42 face each other occurs when the compressed portion 12 is formed, and the thickness direction T1 is parallel to the thickness direction T2.

In the present embodiment, the shapes of the first convex portion 32 and the second convex portion 42 both have a truncated cone shape. The upper surface of the truncated cone is a flat surface, and chamfers CC1 and CC2 are applied to portions (or corners) where the upper surface (top surface) and the side surface meet. The central axes of the truncated cones of the first convex portion 32 and the second convex portion 42 overlap, therefore, the center of the circular first area A1 of the top portion 32 t of the first convex portion 32 and the top portion 42 t of the second convex portion 42 The center of the circular second area A2 is on the central axis CP and overlaps when viewed in the thickness direction T1 or T2. However, the area of the first region A1 (circular region) of the top 32t (top surface) of the first convex portion 32 is the area of the second region A2 (circular region) of the top 42t (top surface) of the second convex portion 42 Less than. Therefore, (the first convex portion 32 and the second convex portion 42 of) the first roll 30 and the second roll 40 are configured such that the projection of the first area A1 with respect to the second area A2 falls within the second area A2. ing. In other words, when the first area A1 and the second area A2 virtually overlap, the second area A2 is configured to protrude around the first area A1. In particular, in the present embodiment, the first area A1 and the second area A2 are concentric circles.

Here, the diameter D1 of the top portion 32t of the first convex portion 32 is, for example, 0.5 to 3 mm, preferably 1 to 2 mm mainly from the viewpoint of absorption performance and hardness, and the height d10 is 2 to 8 mm, for example Preferably, it is 3 to 5 mm from the viewpoint of the stable formation of the pressing portion. On the other hand, the diameter D2 of the top portion 42t of the second convex portion 42 is, for example, 0.7 to 8 mm, preferably 1.4 to 5 mm mainly from the viewpoint of absorption performance and hardness, and the height d10 is 2 to 9 mm, for example. The thickness is preferably 3 to 6 mm mainly from the viewpoint of stable formation of the pressing portion. The magnification of the area of the second area A2 to the first area A1 is, for example, 1.8 to 5 times, and the lower limit is preferably 2.0 times, more preferably 2.2, and the upper limit is preferably 4. It is 0 times, more preferably 2.5 times.

At least one of the truncated cone of the upper surface of the first convex portion 32 and the second convex portion 42 may be not a flat surface, there is no hindrance to the formation of the compression portions 12, i.e., the predetermined high density portion E _D If it can form, another shape may be sufficient. For example, a partially flat surface, a gently convex curved surface, a gently concave curved surface, or a combination thereof may be used. In addition, the shape of at least one of the first convex portion 32 and the second convex portion 42 does not have to be the shape of a truncated cone, and it protrudes from the outer peripheral surface 30W and / or 40W and satisfies the conditions of the top area described above. It is not particularly limited, and may be, for example, the shape of another frustum, or a combination of those. In addition, at least one of the first protrusion 32 and the second protrusion 42 may not be chamfered.

In the state of FIG. 6 (a) and FIG. 6 (b), a laminate of the third semi-finished product P3 (absorbent body 3) and the surface sheet TS is placed between the first convex portion 32 and the second convex portion 42. The pressing portion 12 shown in FIG. 2 can be formed by inserting the first convex portion 32 and the second convex portion 42 so as to approach each other and sandwiching the laminated body.
In this case, although the first convex portion 32 and the second convex portion 42 face each other, the positions of the both convex portions may be relatively shifted. FIG. 6C shows a state in which the positional relationship between the first convex portion 32 and the second convex portion 42 in FIG. 6A is relatively shifted from the thickness direction T1 or the thickness direction T2. FIG. Even in this case, the area of the first area A1 is smaller than the area of the second area A2, and the projection of the first area A1 with respect to the second area A2 falls within the second area A2. The protrusions 42 appropriately overlap in the thickness directions T1 and T2, and the laminate of the third semifinished product P3 and the top sheet TS can be appropriately squeezed.

Similarly, the

first protrusions

31, 33, 34 and the

second protrusions

41, 43, 44 further have the following configuration. FIG. 7A is a cross-sectional view of the first protrusion 31 and the second protrusion 41 in a state in which the first protrusion 31 and the second protrusion 41 face each other. FIG. 7B is a perspective view of the first convex portion 31 and the second convex portion 41 in FIG. 7A viewed from the thickness direction T1 or the thickness direction T2. A state in which the first convex portion 31 and the second convex portion 41 face each other occurs when the compressed groove 11 is formed, and the thickness direction T1 is parallel to the thickness direction T2. The configurations and relationships of the first

convex portions

33 and 34 and the second

convex portions

43 and 44 are the same as the configurations and relations of the first convex portion 31 and the second convex portions 41, and therefore Only the convex portion 31 and the second convex portion 41 will be described.

In the present embodiment, the shapes of the first convex portion 31 and the second convex portion 41 have the shape of a low thick wall or bank extending in the direction in which they extend. The shape of the cross section cut in a plane perpendicular to the direction in which the first and second

convex portions

31 and 41 extend has a rectangular or trapezoidal shape. The upper surface of the wall is a flat surface, and chamfers CC3 and CC4 are applied to the places where the upper surface (top surface) and the side surfaces meet. The upper surfaces of the walls of the first protrusion 31 and the second protrusion 41 have the shape of a band extending along the direction in which the first protrusion 31 and the second protrusion 41 extend. The axes of the strip-like upper surfaces overlap in the thickness direction T1 and T2, and thus the axis of the first hinge area A3 of the top 31t of the first protrusion 31 and the second hinge area of the top 41t of the second protrusion 41. The axis of A4 is on the axis CX and overlaps when viewed from the thickness direction T1 or the thickness direction T2. However, the area of the first hinge region A3 of the top portion 31t of the first convex portion 31 is smaller than the area of the second hinge region A4 of the top portion 41t of the second convex portion 41. Therefore, the first roll 30 and the second roll 40 (the first convex portion 31 and the second convex portion 41 of the first roll 30 and the second roll 40 are the first convex portion (first hinge convex) forming the pressing grooves (hinge) 11, 13, 14 Section) projection of the first hinge area A3 with respect to the second hinge area A4 in a state where the second projection (the second hinge convex section) 41, 43, 44 oppose each other is the second hinge It is configured to fit within the area A4. In other words, when the first hinge area A3 and the second hinge area A4 virtually overlap, the second hinge area A4 is configured to protrude around the first hinge area A3.

Here, the width D3 of the top portion 31t of the first convex portion 31 is, for example, 0.5 to 4 mm, preferably 1 to 3 mm mainly from the viewpoint of absorption performance and hardness, and the height d30 is 2 to 8 mm, for example Preferably, it is 3 to 5 mm from the viewpoint of the stable formation of the pressing portion. On the other hand, the width D4 of the top 41t of the second convex portion 41 is, for example, 1 to 10 mm, preferably 2 to 7 mm mainly from the viewpoint of absorption performance and hardness, and the height d40 is, for example, 2 to 9 mm, mainly the pressing portion Preferably, it is 3 to 6 mm from the viewpoint of stable formation of The magnification ratio of the area of the second hinge area A4 to the first hinge area A3 is, for example, 2 to 4 times, the lower limit is preferably 2.2 times, more preferably 2.5, and the upper limit is preferably 3.3. 5 times, more preferably 3 times.

The upper surface of at least one frustum of the first convex portion 31 and the second convex portion 41 may not be a flat surface, and there is no hindrance to the formation of the pressing grooves (hinge) 11, 13, that is, a predetermined if the high-density portion E _G of formation, and may be another shape. For example, a partially flat surface, a gently convex curved surface, a gently concave curved surface, or a combination thereof may be used. In addition, the shape of at least one of the first convex portion 31 and the second convex portion 41 may not be the shape of a frustum, and it protrudes from the outer peripheral surface 30W and / or 40W and satisfies the above conditions of the top area It is not particularly limited. In addition, at least one of the first convex portion 31 and the second convex portion 41 may not be chamfered.

In the state of the said FIG. 7 (a) and FIG.7 (b), between the 1st

convex part

31,33,34 and the 2nd

convex part

41,43,44, the 3rd semi-finished product P3 (absorber 3) and The compressed groove shown in FIG. 2 is obtained by inserting the laminate with the front sheet TS and holding the laminate by bringing the

first projections

31, 33, 34 and the

second projections

41, 43, 44 close to each other. (Hinges) 11, 13, 14 can be formed. In this case, although the first

convex portions

31, 33, 34 and the second

convex portions

41, 43, 44 face each other, the positions of the both convex portions may be relatively shifted. . FIG. 7C shows a state in which the positional relationship between the first convex portion 31 and the second convex portion 41 in FIG. 7A is relatively shifted from the thickness direction T1 or the thickness direction T2. FIG. Even in this case, the area of the first hinge area A3 is smaller than the area of the second hinge area A4, and the projection of the first hinge area A3 with respect to the second hinge area A4 falls within the second hinge area A4. The part 31 and the 2nd convex part 41 overlap suitably in thickness direction T1 and T2, and can squeeze the layered product of the 3rd semi-finished product P3 and top sheet TS appropriately. The same applies to the

first protrusions

33 and 34 and the

second protrusions

43 and 44.

Then, referring to FIG. 3 again, the fourth step is performed in the fourth unit 300D. The fourth unit 300D includes the transport roll 160, the transport roll 161, the coating device 304, and the surrounding cutting device 170. In the fourth step, the continuous sheet-like back sheet BS is supplied from the roll WR 4 to the transport roll 161. The hot melt adhesive is applied to one side of the back sheet BS by the application device 304. The back sheet BS supplied from the transport roll 161 is pressed on the transport roll 160 against one side of the fifth semi-finished product P5. Thus, a sixth semifinished product P6 in which the fifth semifinished product P5 and the back sheet BS are stacked is formed. Subsequently, the sixth semi-finished product P 6 is cut at the periphery by the periphery cutting device 170 and separated into the shape of the sanitary napkin 1. Thereby, a seventh semifinished product P7 is formed. The seventh semifinished product P7 is substantially the sanitary napkin 1 (FIG. 1).

As described above, the sanitary napkin 1 is manufactured.

As shown in the present embodiment, in the present manufacturing method, at least the absorbent 3 (third semifinished product P3) is formed by the first convex portion 32 of the first roll 30 and the second convex portion 42 of the second roll 40. The pressing portion 12 is formed by pressing from both sides in the thickness direction T1 and T2. Therefore, it suffices to press the absorber 3 by half the thickness of each protrusion, and the thickness of the absorber 3 pressed by each protrusion can be reduced. Thereby, it can suppress that a hard area | region is formed around the pressing part 12 in the absorber 3. As shown in FIG. Furthermore, in the present manufacturing method, the second region A2 of the top portion 42t of the second convex portion 42 with the first roll 30 and the second roll 40 facing each other with the first convex portion 32 and the second convex portion 42 facing each other. The projection of the first area A1 of the top portion 32t of the first convex portion 32 to the above is configured to be accommodated in the second area A2. Therefore, when the first convex portion 32 and the second convex portion 42 face each other with the absorber 3 interposed therebetween, the second convex portion 42 can be reliably overlapped with the first convex portion 32. Therefore, the second convex portion 42 and the first convex portion 32 can reliably sandwich the absorber 3 to reliably form the compressed portion 12 having the planar shape of the first convex portion 32. Thereby, the shape of the pressing part 12 can be made hard to collapse. Therefore, when forming the several pressing part 12 for improving absorption performance, while being able to maintain the shape of the some pressing part 12 stably, it can suppress that an absorber becomes hard. These effects are particularly remarkable when the basis weight of the absorber 3 is large (example: 500 g / m ² or more).

As a preferable mode in the present embodiment, the supply process includes the surface sheet TS (surface sheet 4) and the third semifinished product P3 (absorbent 3) in the gap between the pair of rolls (the first roll 30 and the second roll 40). And laminating and supplying. For example, a roll having a convex portion from the surface sheet side while supporting the laminate of the absorber and the surface sheet with a roll having a smooth outer peripheral surface for the purpose of improving absorption performance, for example, absorption speed etc. May be pressed to form a pressed part. In such a case, since the top sheet is less likely to stretch than the absorber, there is a possibility that it will be difficult to appropriately form the pressed portion as compared with the case where only the absorber is pressed. In that case, there is a possibility that the shape of a pressing part may collapse easily. Therefore, in the present manufacturing method, the laminated body of the surface sheet TS (the surface sheet 4) and the third semifinished product P3 (the absorber 3) is formed from the first convex portion 32 from both sides of the third semifinished product P3 side and the surface sheet TS side. And the second convex portion 42 to form a pressed portion. Therefore, even when forming the pressing part 12 in the laminated body, since it is not necessary to stretch the surface sheet TS so much at the time of pressing, the shape of the pressing part 12 can be hardly deformed.

As a preferable mode in the present embodiment, at least one of the first area A1 and the second area A2 includes a flat surface. However, a flat surface is a plane whose flatness (JIS_B_0621) is 0.1 mm or less. As described above, in the present manufacturing method, the flat surface is provided in the region (A1 or A2) of the top (32t or 42t) of at least one of the first protrusion 32 and the second protrusion 42 (32 or 42). Have. Therefore, by squeezing with the convex portion having the flat surface, the first convex portion 32 and the second convex portion 42 more reliably sandwich the third semi-finished product P3 (the absorber 3), and the squeezed portion 12 is further enhanced. It can be formed stably and reliably. Therefore, the shape of the pressing portion 12 can be made more difficult to collapse.

As a preferable aspect in the present embodiment, in the first roll 30 and the second roll 40, each of the plurality of first convex portions 32 and the plurality of second convex portions 42 is a row in the first direction (example: width direction W) And a plurality of the rows are spaced apart in a second direction (e.g. longitudinal direction L) having a predetermined angle (e.g. 90 degrees) with respect to the first direction (e.g. width direction W) Is configured as. For example, in the case where the absorber is supported by a roll having a smooth outer peripheral surface on one side and squeezed by a roll having a convex portion from the other side, the plurality of convex portions form the outer peripheral surface of the roll The larger the difference is, the larger the difference between the moving speed of the roll-side part having the convex portion and the moving speed of the roll-side part having the smooth outer peripheral surface. In such a case, it becomes difficult to appropriately form the pressing portion, and the shape of the pressing portion may be easily broken. So, in this manufacturing method, the 3rd semi-finished product P3 (absorber 3) is squeezed by the 1st convex part 32 and the 2nd convex part 42 from the both sides of one side and the other side, and the pressing part 12 is formed. Therefore, even when forming the plurality of pressing parts 12 in a wide range of the third semi-finished product P3, it is not necessary to stretch the surface sheet TS so much at the time of pressing, so that the shape of each pressing part 12 can be made difficult to collapse.

As a preferable mode in the present embodiment, at least one of the first convex portion 32 and the second convex portion 42 has a columnar or frustum shape. Thus, in the present manufacturing method, the first convex portion 32 and / or the second convex portion 42 has a columnar or frustum shape, that is, the outer peripheral surface 30W of the first roll 30 and / or the second roll 40 and / or Alternatively, the thickness has a constant or tapered shape from the 40 W outward. Therefore, when squeezing 3rd semi-finished product P3 (absorber 3), the load concerning the area | region around the pressing part 12 can be suppressed, and it can suppress more that the surrounding area becomes hard.

As a preferable mode in the present embodiment, at least one of the first convex portion 32 and the second convex portion 42 has a bevel CC1 and / or CC2 at the tip. Therefore, in the present manufacturing method, when forming the pressed portion 12 in the third semi-finished product P3 (the absorbent 3), when the first convex portion 32 and / or the second convex portion 42 enter the third semi-finished product P3, The shear load on the third semifinished product P3 by the corner portion of the tip of the convex portion is relieved. As a result, cutting of fibers at the periphery of the pressing portion 12 can be made difficult to occur, and the shape of the pressing portion 12 can be made more difficult to break.

In a preferred embodiment according to the present embodiment, pressing grooves (hinges) 11 and 13 extending in the longitudinal direction L of the absorber 3 are provided on the outer peripheral surface 30W and / or 40W of at least one of the first roll 30 and the second roll 40. The convex part for 14 is further arrange | positioned. That is, the first convex portion 32 and the second convex portion 42 for the pressing portion 12 and the convex portion for the hinge are provided on the outer peripheral surface of at least one of the same first roll 30 and the second roll 40. Therefore, when forming the pressing groove (hinge) 11, 13, 14 and the pressing portion 12 in the third semi-finished product P3 (absorbent body 3), the first

convex portion

34, 33, 34 for the

pressing groove

11, 13, 14 The third semi-finished product P3 is continuously pressed in the transport direction MD (longitudinal direction L) by the large y day second

convex portions

41, 43, 44 to form the

compressed grooves

11, 13, 14, and the third half The clearance of product P3 can be suppressed. Since the clearance allowance of the third semi-finished product P3 is suppressed, the squeezing can be properly performed by the

convex portions

32 and 42 for the squeezing portion 12. Thereby, the pressing part 12 can be more stably formed in a predetermined position by a predetermined shape, and the shape of the pressing part 12 can be made more difficult to collapse.

As a preferable aspect in the present embodiment, the first convex portions (first convex portions) are formed on the outer

peripheral surfaces

30W and 40W of the first roll 30 and the second roll 40 as convex portions for the pressing grooves (hinge) 11, 13 and 14, respectively. The

hinge projections

31, 33, 34 and the second projections (second hinge projections) 41, 43, 44 are further arranged (see FIG. 7). In the forming step, the third semi-finished product P3 (the absorber 3) is made to have a height direction TD (thickness) such that the first

convex portions

31, 33, 34 and the second

convex portions

41, 43, 44 face each other. Squeezing from both sides of the direction T) to form the squeezing

grooves

11, 13, 14; The first roll 30 and the second roll 40 are configured such that the

first projections

31, 33, 34 forming the

compressed grooves

11, 13, 14 and the

second projections

41, 43, 44 face each other, respectively. Projection of the first hinge area A3 of the tops 31t, 33t, 34t of the

first projections

31, 33, 34 to the second hinge area A4 of the tops 41t, 43t, 44t of the projections 41 43 44 is the second hinge area It is configured to fit within A4. Therefore, in the present manufacturing method, when the first

convex portions

31, 33, 34 and the second

convex portions

41, 43, 44 face each other with the third semifinished product P3 interposed therebetween, the second

convex portions

41, 43, 44 Can reliably overlap the

first projections

31, 33, 34. Therefore, the second

convex portions

41, 43, 44 and the first

convex portions

31, 33, 34 securely sandwich the third semi-finished product P3 and the compressed grooves 11 of the size of the first

convex portions

31, 33, 34 , 13, 14 can be formed reliably. Thereby, the shape of the

pressing grooves

11, 13, 14 can be made less likely to collapse.

In the above embodiment, the shape of at least one of the first convex portion 32 and the second convex portion 42 is thickened outward from the outer peripheral surface 30W and / or 40W of the first roll 30 and / or the second roll 40. Is constant or tapered. However, the shape of at least one of the first convex portion 32 and the second convex portion 42 is not limited to that example, and another shape, for example, a predetermined height position based on the outer peripheral surface 30W and / or 40W The cross-sectional shape from the tip to the tip may be constant. FIG. 8 is a cross-sectional view showing another configuration example of the first convex portion 32 and the second convex portion 42 and the relationship between the two. In this configuration example, as compared with the configuration example of FIG. 6, the cross-sectional shape from the predetermined height position in the first convex portion 32 to the tip is constant. That is, in the first convex portion 32 whose height from the outer peripheral surface 30W is d10 (= d11 + d12), the shape from the position of the outer peripheral surface 30W to the position of the height d11 is a truncated cone, from the position of the upper surface of the truncated cone The shape up to the position of the height d12 is a cylinder. Therefore, the cross-sectional shape from the position of the height d11 to the top 32t which is the tip is circular and constant. For example, d11 is, for example, 1/6 to 1/2 of the dimension of d10, and preferably 1/5 to 1/3 from the viewpoint of the stability of the first convex portion 32 in use. The dimensions are preferred. In addition, not only the first convex portion 32 but also the cross-sectional shape from the predetermined height position of the second convex portion 42 to the tip may be constant. In addition, the cross-sectional shape from the predetermined height position to the tip may be constant also for the first

convex portions

31, 33, 34 and / or the second

convex portions

41, 43, 44 as well. In the first convex portion 32 and the second convex portion 42, even if the cross-sectional shape from the predetermined height position to the tip is constant, the shape from the bottom to the predetermined height position is the shape of a weight pedestal as a whole Shall be regarded as the shape of a frustum.

At this time, in the present manufacturing method, when the third semi-finished product P3 (absorbent body 3) is squeezed, the first convex portion 32 and / or the first convex 32 and / or Since the cross-sectional shape of the 2 convex part 42 is constant, the force which pushes the fiber of 3rd semi-finished product P3 hardly works. Therefore, the bottom of the pressing portion 12 can be stably formed. Thereby, the shape of the pressing portion 12 can be made more difficult to collapse. In particular, when the cross-sectional shape from the predetermined height position to the tip of the first convex portion 32 is constant, the following effects can be obtained. Since the first convex portion 32 is smaller than the second convex portion 42, the tip is relatively easily worn away in the forming process. Therefore, in the present manufacturing method, by making the cross-sectional shape from the predetermined height position to the tip constant for the first protrusion 32, even if the tip of the first protrusion 32 is worn, the cross-sectional shape is constant. And can control fluctuations. Therefore, the shape of the desired pressing part 12 can be stably formed. Thereby, the shape of the pressing portion 12 can be made more difficult to collapse.

The absorbent article of the present invention is not limited to the above-described embodiment, and the embodiments can be combined or changed without departing from the object and the purpose of the present invention.

1 Sanitary napkin (absorbent article)
12 squeezing part 30 first roll 32 first convex part 32t top part 40 second roll 42 second convex part 42t top part P3 third semi-finished product (absorbent body)
A1 first area A2 second area

Claims

A method of producing an absorbent article comprising an absorbent, comprising:
A pair of rolls disposed facing each other and rotating in opposite directions, a first roll having a plurality of first protrusions disposed on the outer circumferential surface, and a second having a plurality of second protrusions disposed on the outer circumferential surface Supplying at least an absorbent to a gap between the pair of rolls including the rolls;
The plurality of second corresponding to each of the plurality of first convex portions and each of the plurality of first convex portions while inserting the at least the absorber between the first roll and the second roll. Forming the plurality of compressed portions by squeezing the absorber from both sides in the thickness direction so that each of the convex portions faces each other;
Equipped with
The first roll and the second roll are configured such that, in a state where the first convex portion forming the compressed portion and the second convex portion face each other, the first roll and the second roll with respect to the second region of the top of the second convex portion. A projection of a first region at the top of the first protrusion is configured to be within the second region;
Method of manufacturing an absorbent article
The supplying step includes a step of laminating and supplying a surface sheet and the absorber in a gap between the pair of rolls.
The manufacturing method of the absorbent article of Claim 1.
At least one of the first region and the second region includes a flat surface,
The manufacturing method of the absorbent article of Claim 1 or 2.
In the first roll and the second roll, each of the plurality of first convex portions and the plurality of second convex portions are arranged in a row in a first direction, and a plurality of the rows are arranged in the first direction. It is comprised so that it may line up at intervals with respect to the 2nd direction which has a predetermined angle with respect to,
The manufacturing method of the absorbent article as described in any one of Claims 1-3.
At least one of the first convex portion and the second convex portion has a columnar or frustum shape.
The manufacturing method of the absorbent article as described in any one of Claims 1-4.
At least one of the first convex portion and the second convex portion has a constant sectional shape from a predetermined height position to the tip.
The manufacturing method of the absorbent article as described in any one of Claims 1-5.
The first convex portion has a constant sectional shape from a predetermined height position to the tip.
The manufacturing method of the absorbent article of Claim 6.
At least one of the first convex portion and the second convex portion is chamfered at a corner portion of the tip.
The manufacturing method of the absorbent article as described in any one of Claims 1-7.
On the outer peripheral surface of at least one of the first roll and the second roll, a projection for a hinge extending in the longitudinal direction of the absorber is further disposed.
The manufacturing method of the absorbent article as described in any one of Claims 1-8.
A protrusion for the first hinge and a protrusion for the second hinge are further disposed as the protrusion for the hinge on the outer peripheral surface of the first roll and the second roll, respectively.
The forming step is
Forming the hinge by squeezing the absorber from both sides in the thickness direction so that the first hinge convex portion and the second hinge convex portion face each other,
The first roll and the second roll are formed on the top of the second hinge projection in a state in which the first hinge projection and the second hinge projection forming the hinge face each other. A projection of a first hinge area on top of the first hinge projection with respect to a two-hinge area is configured to fit within the second hinge area;
The manufacturing method of the absorbent article of Claim 9.