JP4739942B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article to which an adhesive for fixing to clothing is applied.

Absorbent articles such as sanitary napkins, panty liners, and absorbent pads have an adhesive on the back sheet side that comes into contact with their clothing (underwear) surface to prevent misalignment and wrinkles during use. It has been applied. The pressure-sensitive adhesive application part is covered with a release sheet such as a release paper or a release treatment film, and the release sheet is peeled off at the time of use to adhere and fix the absorbent article to the undergarment.
This pressure-sensitive adhesive is required not to remain in the underwear after the used absorbent article is peeled from the underwear. For this purpose, a technique for exposing a film layer of a backsheet composed of two layers, a nonwoven fabric layer located on the underwear side and a film layer located on the absorber side, and applying an adhesive to the exposed portion to form a displacement preventing portion. Is known (Patent Document 1).
In addition, in order to effectively prevent the occurrence of displacement and vertical wrinkles, a technique is known in which a plurality of adhesive slip prevention means having different lengths in the short direction (lateral direction) of the absorbent article are provided. (Patent Document 2).
JP 2005-118533 A JP 2003-10245 A

  By the way, in order to improve a user's fit and absorptivity, as shown to FIG. 12 and FIG. 13 (cross-sectional view in the BB 'line | wire of FIG. 12), the longitudinal direction (vertical | vertical) of an absorbent article is shown. In the direction, a line-shaped recess 4 (also referred to as a “pressed groove” or “fit emboss”) is formed. Accordingly, when the absorbent article is compressed in the lateral direction, the central region of the absorbent body is lifted upward and is in close contact with the user's body.

On the other hand, as described above, an adhesive is applied to the back sheet in order to fix the absorbent article to clothing such as underwear. As shown in FIGS. 12 and 13, this adhesive is also applied to the position where the concave portion 4 is formed (adhesive application portion 51). At this time, when the application of the pressure-sensitive adhesive is performed in a planar manner by transfer from the release sheet, air is provided between the coated pressure-sensitive adhesive and the concave portion of the back sheet at a position overlapping the concave portion on the underwear surface side. Mixed. Thus, the adhesive at the position where air is mixed is not fixed to the back sheet but is held away from the back sheet. Therefore, when the absorbent article is attached to the underwear, the pressure-sensitive adhesive is adhesively fixed only to the underwear. As a result, when the absorbent article is removed from the underwear after use, the adhesive may remain on the underwear side. Moreover, when peeling a peeling sheet at the time of use start, an adhesive may adhere to a peeling sheet and may peel from a back surface sheet.
Then, an object of this invention is to provide the absorbent article which prevented the transfer (adhesive transfer) of the adhesive to the peeling sheet side or the clothing side as mentioned above at the time of the start of use or after use.

The first aspect of the present invention for achieving the above object is an absorbent article comprising a top sheet in contact with the skin, a back sheet in contact with clothing, and an absorbent provided between the top sheet and the back sheet. Te, the backsheet on its garment surface, recess and a coated portion coated with adhesive, and a said pressure-sensitive adhesive is not coated non-coated portion, the coating portion and Hinuriko Each part of the part relates to an absorbent article existing on the inner wall surface of the recess .

  In the absorbent article according to the first aspect of the present invention, at least a part of the pressure-sensitive adhesive non-coated portion is disposed at a position overlapping the concave portion on the clothing surface side. Therefore, unlike the prior art, the entire concave portion is not covered with the adhesive when the adhesive is applied (transferred). Therefore, when the absorbent article is pressed in the vertical direction during the transfer of the adhesive or in the subsequent processing step, the air that exists between the coating portion and the concave portion disposed at a position overlapping the concave portion. Moves in the horizontal direction by the applied pressure and is discharged from the adjacent non-coated portion. And the adhesive of a coating part adhere | attaches on the back surface sheet | seat of a recessed part with discharge | emission of air.

As described above, in the absorbent article according to the present invention, the pressure-sensitive adhesive is adhered to the back sheet (including a recess when a recess is present). Therefore, when the absorbent article is bonded to the undergarment, the pressure-sensitive adhesive adheres to both the absorbent article and the undergarment. Here, due to the difference in surface properties (easiness of wetting) between the back sheet, which is usually a plastic film, and the cloth material constituting the underwear, the peel strength between the adhesive and the back sheet is the peel strength between the adhesive and the clothing surface. Greater than.
As a result, when the absorbent article is removed from the underwear after use, the pressure-sensitive adhesive remains on the back sheet side and is suppressed from moving to the clothing surface side.

Similarly, when a release sheet such as release paper or release treatment film is provided in the pressure-sensitive adhesive coating portion, the pressure-sensitive adhesive adheres to both sides of the back sheet and the release sheet or only to the back sheet. In this case, the peel strength between the pressure-sensitive adhesive and the back sheet is greater than the peel strength between the pressure-sensitive adhesive and the release sheet, so when peeling the release sheet at the start of use, the pressure-sensitive adhesive remains on the back sheet side and the peel sheet side Transition to is suppressed.
Furthermore, since the pressure-sensitive adhesive coating part can be formed regardless of the position where the concave part exists, both the concave part and the coated part can be freely positioned, and each effect can be achieved without being restricted by each other. Can be demonstrated.

Preferred embodiments of the absorbent article according to the present invention will be described with reference to the drawings, but the present invention is not limited to the following embodiments.
Absorbent articles are used to absorb bodily fluids, such as sanitary napkins, panty liners, origami sheets, incontinence pads, etc. attached to the inner surface of shorts, and attached to the inner surface of diaper covers. Including absorbent pads.

  This absorbent article includes a top sheet (top sheet) in contact with the skin, a back sheet (back sheet) in contact with the clothing surface, and an absorber (absorbent core) positioned between the two sheets. A pressure-sensitive adhesive for fixing the absorbent article to clothing or the like during use is coated on the clothing surface side of the back sheet. And in 1st this invention (and in 2nd this invention arbitrarily), it has the recessed part (it is also called a fit emboss) formed in the orthogonal | vertical direction (with respect to the said surface) on the clothing surface side.

In 1st this invention, it arrange | positions in the position which at least one part of the non-coating part to which an adhesive is not applied overlaps with a recessed part.
An absorbent article comprising a top sheet in contact with the skin, a back sheet in contact with clothing, and an absorbent provided between the top sheet and the back sheet, the back sheet having an adhesive on the clothing surface side Absorbent article having a coated surface coated on the back sheet, the coated surface being bonded to the back sheet at all sites In the second aspect of the present invention, the coating part has a coated surface to be coated on the back sheet, and this coated surface is bonded to the back sheet at all sites. In the case of having a recess, this coated surface is bonded to the back sheet side also in the recess region.
When the coated surface in the first and second inventions is covered with release paper as a release sheet, there is substantially no adhesive that adheres only to the release paper side, and the adhesive is always on the back sheet side. Glued. In the embodiment including the recess, the adhesive is adhered to the wall surface in the recess, that is, the back sheet. The adhesive in the recess may or may not be adhered to the release paper. That is, the pressure-sensitive adhesive coating part is bonded to both the back sheet and the release paper, or is bonded only to the back sheet.

In 1st this invention, it is preferable that the non-coating part of an adhesive exists along the longitudinal direction of a recessed part. In other words, it is preferable that the coating part is discontinuously formed in the short direction of the concave part around the concave part, that is, the coated part is not continuous in the short direction so as to cross the concave part. Thereby, in the transversal direction (width direction) of a recessed part, an adhesive does not cover a recessed part, As a result, the transfer of the adhesive to the clothing side can be prevented. In general, the recess has a long distance in the longitudinal direction of the absorbent article and a short distance in the short direction. For this reason, the concave portion is often covered with the adhesive in the short direction, and the above-described problem of transfer of the adhesive has occurred.
Furthermore, the above configuration makes it possible to bond the two in the position where the non-coated portion exists in the concave portion even when a deviation in the width direction occurs during the bonding process between the back sheet and the release sheet. It is possible to prevent the adhesive from being transferred to.

It is preferable that the adhesive region, which is a region where the coating portions are gathered, also extends in the longitudinal direction of the concave portion.
Here, the pressure-sensitive adhesive non-coated part (or coated part) “extends in the longitudinal direction” means that the pressure-sensitive adhesive non-coated part (or coated part) is continuously formed in the longitudinal direction. It includes not only the case where there is a discontinuous part (part to be interrupted by the coated part or the non-coated part). That is, the case where the non-coating part (or coating part) is extended in the longitudinal direction is included.

In the first and second aspects of the present invention, the application part of the pressure-sensitive adhesive that extends in the longitudinal direction of the absorbent article or the concave part can take various application patterns and can have various shapes. For example,
(1) A pattern in which coated parts (and non-coated parts) are alternately arranged in a line along the longitudinal direction of the absorbent article,
(2) A pattern in which the coating part (and the non-coating part) is arranged in a lattice pattern,
(3) A pattern in which the coating part is formed of any one of a graphic pattern, a character pattern, a picture pattern, a spiral shape, an Ω shape, and a wave shape,
(4) There is a non-coated portion in the coated portion, and the non-coated portion is a pattern formed of any one of a graphic pattern, a character pattern, a picture pattern, a spiral shape, an Ω shape, and a wave shape,
Etc. are mentioned as a preferable form.
Hereinafter, as a representative example of the absorbent article, a specific embodiment will be described using a sanitary napkin as an example.

  FIG. 1 is a bottom view showing one embodiment of a sanitary napkin, and FIG. 2 is a cross-sectional view taken along the line A-A ′ of FIG. 1. As shown in the figure, a sanitary napkin 10 as an absorbent article includes a top sheet (top sheet) 1 in contact with the skin, a back sheet (back sheet) 2 in contact with the clothing surface, and a position between these two sheets. An absorbent body (absorbent core) 3 is provided.

The top sheet 1 has liquid permeability, and a nonwoven fabric made of hydrophilic fibers such as rayon fiber, pulp fiber, synthetic fiber, a porous plastic sheet, or the like can be preferably used.
The back sheet 2 has liquid impermeability, and various plastic sheets such as polyethylene and polyvinyl alcohol can be used. The back sheet 2 may be breathable or non-breathable.
Each of the top sheet and the back sheet may have a multilayer structure. For example, the back sheet may have a structure in which a nonwoven fabric is laminated on a plastic sheet.
The absorber 3 existing between the top sheet 1 and the back sheet 2 is formed of a laminate of pulp, a laminate of pulp and a superabsorbent polymer, or the like.
Various known materials are used for the constituent materials of these absorbent articles, and are not particularly limited.

In this absorbent article 10, two grooves (fit embosses) 4 and 4 are formed as recesses in a line extending in the longitudinal direction. The formation of the grooves 4 and 4 increases the rigidity of the entire absorbent body, and as a result, warp during use is prevented. At the same time, the groove can enhance the fit of the absorbent article to the body. Furthermore, the lateral leakage of the liquid in the width direction can be prevented by promoting the movement of the body fluid in the longitudinal direction.
It is preferable that the groove parts 4 and 4 are extended in the longitudinal direction of the absorbent article. The shape is not particularly limited, such as a linear shape or a curved shape.

The length L1 (FIG. 1) of the groove parts 4 and 4 is not more than the length between the front and rear ends of the absorber 3, and the width W1 is not particularly limited, but is preferably about 1 to 15 mm. The section depth d1 (FIG. 2) on the underwear surface side of the recess is not particularly limited, but is preferably about 1 to 10 mm.
The groove parts 4 and 4 are formed by, for example, pressing (compressing) the absorbent article in the vertical direction with a pressure roll having a molding protrusion. For example, a recessed part can be formed in an absorber with a pressure roll, and a surface sheet and a back sheet can be stuck after that. Alternatively, before the back sheet 2 is bonded, first, a recess may be formed on the top sheet 1 and the absorbent body 3 with a pressure roll, and then the back sheet may be bonded. In these cases, a recess is also formed in the back sheet 2 following the existing recess of the absorber. Or you may pressurize with the pressure roll to the whole absorptive article with which the back sheet was stuck, and may form a crevice.

The back surface sheet 2 is formed with an adhesive region 5 to which an adhesive is applied. As the pressure-sensitive adhesive, an adhesive such as a hot-melt adhesive can be used as long as temporary bonding (that is, bonding and peeling) is possible.
Specifically, for example, SBS (styrene-butadiene-styrene), SEBS (styrene-ethylene-butadiene-styrene), SIS (styrene-isoprene-styrene) and SEBS, SIS and SBS, etc. An adhesive having a base polymer as a base polymer can be preferably used. In this base polymer, additives such as a tackifier, an inorganic filler, a plasticizer, and an antioxidant can be arbitrarily blended.

It is preferable that the formed adhesive region 5 is covered with a release paper (release sheet) 6 which has been treated with a release agent and protected until use.
The pressure-sensitive adhesive can be applied to the back sheet, for example, by first applying the pressure-sensitive adhesive to the release paper 6 and transferring it to the back sheet.
Coating basis weight of the adhesive is preferably about 5 to 100 g / ^{m 2,} and more preferably about 15 to 50 g / ^{m 2.}

As shown in FIGS. 1 and 2, a coating pattern including a coating part 51 and a non-coating part 52 is formed in the adhesive region 5. In this embodiment, the coating part 51 and the non-coating part 52 are formed and arranged in pairs along the longitudinal direction of the absorbent article.
As shown in FIG. 2, the coating part 51 includes a groove peripheral coating part 511 provided in the periphery of the groove part, and a central coating part 512 provided in an inner central part between the groove parts 4 and 4. The groove peripheral coating part 511 has external coating parts 511 a and 511 d provided outside the groove part 4 and internal coating parts 511 b and 511 c provided inside the groove part 4. Thus, it is preferable that the coating part is discontinuously formed in the groove part 4 in the short direction of the groove part. On the other hand, the central coating part 512 at a position away from the periphery of the groove part 4 may not exist depending on different embodiments.

  The length L2 (FIG. 1) of the groove peripheral coating portion 511 and the central coating portion 512 is equal to or less than the length between the front and rear ends of the absorbent article, and preferably equal to or less than the length of the absorbent body 3. . The width W3 of the central coating part 512 is preferably ½ or less of the interval (distance) D between the groove parts 4 and 4. On the other hand, the width W2 of the groove peripheral coating portion 511 is not particularly limited, but is preferably about 0.3 to 3 mm.

1 and 2 show an embodiment having a central coating portion 512 composed of two lines, the central coating portion 512 may be three or more, or one. Also good.
3 and 4 show a modification of the coating pattern formed in a line shape in the longitudinal direction. As shown in FIG. 3, the width W3 when there is one central coating portion 512 is not particularly limited as long as it is equal to or smaller than the interval D between the groove portions 4 and 4. As shown in FIG. 4, when the central coating portion 512 is formed with the same coating pattern as the groove peripheral coating portion and there are two central coating regions, the width W3 of each central coating region Is preferably ½ or less of the interval D between the groove portions 4 and 4.
The lengths and widths of the plurality of coating parts 51 (511 and 512) and the non-coating part 52 may be different from each other.

Referring to FIGS. 1 and 2 again, a plurality of non-coated portions 52 are arranged alternately with the coated portions 51 in a line along the longitudinal direction. At least a part of the non-coated portion is disposed at a position overlapping the concave portion on the clothing surface side of the groove portions 4 and 4. That is, at least a part of the groove portions 4 and 4 is a non-coated portion 52.
It is preferable that the width W4 (FIG. 1) of the non-coated portion 52 formed in the portion overlapping the groove portion is approximately equal to or less than the width W2 of the groove peripheral coating portion 511.

With the configuration described above, in the product of the present invention, air mixed into the groove portion at the time of manufacture does not remain under the pressure-sensitive adhesive coating portion, and thus the shift to the underwear or the like of the pressure-sensitive adhesive is prevented. In more detail, it is as follows.
As described above, conventionally, an adhesive is applied so as to cover the entire recess (groove) (FIGS. 12 and 13). Therefore, there is a problem that air remains in the groove portion and there is an adhesive that is not fixed to the back sheet, and this shifts to underwear or the like. On the other hand, in the embodiment of the present invention, a non-coated part is formed at a position overlapping with the groove part, and air mixed in the groove part is discharged from the non-coated part at the time of manufacture. Does not remain. As a result, the pressure-sensitive adhesive is prevented from transferring to release paper or underwear at the start of use and after use of the absorbent article.
Although not shown, a pattern in which the coating part and the non-coating part are formed in a lattice shape and a part of the non-coating part overlaps with the concave part on the clothing surface side is also preferable.

FIG. 5 shows an embodiment in which the shape of the groove 4 is different. In this embodiment, a pair of groove portions 41 formed substantially in parallel along the longitudinal direction and a groove portion 42 formed in an enclosed shape are formed on the left and right side portions of the absorbent article 10 in the short direction. .
In addition, the groove part 4 can be formed in an arbitrary shape, such as being formed in a square shape when viewed from the longitudinal direction.
The configuration of the absorbent article in FIG. 5, the coating pattern of the adhesive, and the like are the same as those shown in FIG.

6-9 shows embodiment from which the coating pattern of an adhesive differs. The configuration of the absorbent article is the same as that shown in FIG. 1 and the like, and the shape of the groove 4 is the same as that of the embodiment of FIG.
More specifically, in the embodiment of FIG. 6, the shape of each individual coating part 51 is a rectangle having a long axis in the longitudinal direction. A plurality of the rectangular coating portions are arranged in the longitudinal direction and the lateral direction, respectively, and the adhesive region extends in the longitudinal direction of the groove portion 4 as a whole.

In the embodiment of FIG. 7, each individual coating part 51 is formed in a circle. A plurality of circular coating portions are arranged in the longitudinal direction and the lateral direction, respectively, and the adhesive region extends in the longitudinal direction of the groove portion 4 as a whole.
In the embodiment of FIG. 8, each individual coating part 51 has a petal shape. Two rows of the coated portions are formed symmetrically at positions overlapping the groove portions 4 and 4. A plurality of these petal-shaped coating portions are arranged in the longitudinal direction, and an adhesive region extending in the longitudinal direction as a whole is formed.
In the embodiment of FIG. 9, each individual coating part 51 is formed in an alphabetic and numeric character pattern. A plurality of coating portions of these character patterns are arranged in the longitudinal direction in two rows at positions overlapping the groove portions 4.

In any of FIGS. 6 to 9 described above, a part of the non-coated portion 52 is present at a position overlapping the groove portion 4.
In addition, the planar shape of each individual coating part can be any graphic pattern such as a polygon other than a rectangle, an ellipse, a character pattern, or a pattern such as a star shape or leaf shape. As long as a part of the coating part is present at a position overlapping the groove part, the coating pattern is not limited at all.

FIG. 10 shows still another embodiment of the adhesive coating pattern. The configuration of the absorbent article is the same as that shown in FIG. 1 and the like, and the shape of the groove 4 is the same as that of the embodiment of FIG.
In the embodiment of FIG. 10, two coating portions 51 are formed in a spiral shape that extends along the longitudinal direction as a whole. A part of the non-coated portion 52 exists at a position overlapping the groove portion 4.
In addition, the planar shape of the coating portion may be an Ω-shape or a wave shape, and a plurality of strips may be formed in the short direction. Alternatively, a single spiral shape having a large pitch that spans the left and right groove portions, an Ω shape, a wave shape, or the like may be used.

FIG. 11 shows still another embodiment of the adhesive coating pattern. The configuration of the absorbent article is the same as that shown in FIG. 1 and the like, and the shape of the groove 4 is the same as that of the embodiment of FIG.
In the embodiment of FIG. 11, the shape of the non-coated portion 52, not the coated portion, is a long rectangle having a long axis in the longitudinal direction, contrary to the embodiment of FIG. 6. A plurality of rectangular non-coated portions are arranged in the longitudinal direction and the lateral direction, respectively, and the adhesive region extends in the longitudinal direction of the groove portion 4 as a whole. A part of the non-coated portion 52 exists at a position overlapping the groove portion 4.
In this way, there is a non-coated part in the coated part, and the shape of the non-coated part is polygonal, circular or other graphic pattern, character pattern, picture, spiral, Ω-shaped, wavy, etc. A coating pattern may be used.

In any of the illustrated embodiments described above, substantially all the portions of the coated surface of the coated portion are bonded to the back sheet also in the groove (concave portion). Further, before the release paper is peeled off, substantially all of the portion of the coated surface is bonded to at least the back sheet side, and there is no pressure-sensitive adhesive bonded only to the release paper side.
In addition, the shape which has a gathering cuff, a flap, etc. in a side part may be sufficient as an absorbent article.

The absorbent article in which the concave portion is formed on the back sheet and the pressure-sensitive adhesive is applied can be produced, for example, by a method including the following steps. In addition, the order of implementation of each process is not restricted to the order of description.
(1) A step of pressurizing the top sheet and the absorber or only the absorber with a pressure roll having a molded convex part to form a concave part;
(2) The process of sticking a back sheet on the absorber in which the said recessed part was formed;
(3) a step of applying a pressure-sensitive adhesive to the release sheet so that at least a part of the non-coated portion overlaps the concave portion; and (4) the release sheet is coated with the pressure-sensitive adhesive. The process of sticking so that may contact the said back surface sheet.
As already described, according to the above configuration, since a part of the non-coated portion is disposed at a position overlapping the concave portion, air mixed into the concave portion does not remain under the pressure-sensitive adhesive coated portion at the time of manufacture. Transition to underwear etc. is prevented.

  In addition to the above-described manufacturing method, the following manufacturing method can also be employed in order to make the coating surface of the pressure-sensitive adhesive coating part adhere to the back sheet including the recesses in all of its parts. That is, before forming the recess, the adhesive may be applied directly to the back sheet, or the adhesive-attached release sheet and the back sheet are pasted together, and then the absorber and the back sheet having the existing recess. You may make it stick.

It is a bottom view showing one embodiment of an absorptive article. It is sectional drawing in the A-A 'line | wire of the absorbent article of FIG. It is a bottom view which shows another one Embodiment of an absorbent article. It is a bottom view which shows another one Embodiment of an absorbent article. It is a bottom view which shows another one Embodiment of an absorbent article. It is a bottom view which shows another one Embodiment of an absorbent article. It is a bottom view which shows another one Embodiment of an absorbent article. It is a bottom view which shows another one Embodiment of an absorbent article. It is a bottom view which shows another one Embodiment of an absorbent article. It is a bottom view which shows another one Embodiment of an absorbent article. It is a bottom view which shows another one Embodiment of an absorbent article. It is a bottom view which shows the conventional absorbent article. It is sectional drawing in the B-B 'line | wire of the absorbent article of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Top sheet 2 Back sheet 3 Absorber 4 Groove part (concave part)
5 Adhesive area 51 Adhesive application part 52 Adhesive non-application part 6 Release paper 10 Absorbent article

Claims (8)

An absorbent article comprising a top sheet in contact with the skin, a back sheet in contact with clothing, and an absorbent provided between the top sheet and the back sheet,
The back sheet has a concave portion, a coated portion coated with an adhesive, and a non-coated portion where the adhesive is not coated on the clothing surface side,
Each of the coated part and the non-coated part is an absorbent article that exists on the inner wall surface of the recess .   The absorbent article according to claim 1, wherein the concave portion is formed by a groove portion, and the non-coated portion extends in the longitudinal direction along the groove portion.   The absorbent article according to claim 1 or 2, wherein the coated part and the non-coated part are alternately arranged in a line in the longitudinal direction of the absorbent article.   The absorptive article according to claim 1 or 2 in which said application part and non-application part are formed in the shape of a lattice.   The absorptive article according to claim 1 or 2 in which said application part is formed in any one of a figure pattern, a character pattern, a picture pattern, spiral shape, omega character shape, and a wave shape.   The non-coated portion exists in the coated portion, and the non-coated portion is formed of any one of a graphic pattern, a character pattern, a picture pattern, a spiral shape, a Ω-shape, and a wave shape. Or the absorbent article of 2. The absorbent article according to any one of claims 1 to 6 , wherein the coating part is covered with a release sheet. The absorptive article according to any one of claims 1 to 7, wherein the coating part existing on the inner wall surface of the concave part is formed discontinuously in a short direction of the concave part .

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