JP5186331B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article including a liquid-permeable top sheet, a liquid-impermeable back sheet, a side sheet, and an absorbent body disposed between the top sheet and the back sheet.

In general, in an absorbent article in which an absorber is disposed between a liquid-permeable top sheet and a liquid-impermeable back sheet, and a flap portion is formed, a back sheet made of one sheet is The absorbent article is configured to cover the entire area from the central region to the flap portion.
JP 2007-14650 A

  However, in such an absorbent article, a step between the region where the absorber is present and the region where the absorber is not present is formed depending on the thickness of the absorber, so that the back sheet is configured by one sheet. There was a problem that wrinkles were likely to occur.

  Therefore, the present invention has been made in view of the above-described problems, and an absorption capable of reducing wrinkles generated on the back sheet at a step between a region where the absorber exists and a region where the absorber does not exist. It aims at providing a property article.

  A first feature of the present invention includes a liquid-permeable top sheet, a liquid-impermeable back sheet, a side sheet, and an absorber disposed between the top sheet and the back sheet. In the absorbent article, the backsheet is constituted by a plurality of backsheet pieces, and a joining region where the backsheet pieces are joined to each other is provided along the longitudinal direction of the absorbent article. In addition, the gist is that the flap portion formed on the outer side in the width direction of the absorbent article with respect to the absorbent body is constituted by at least the side sheet and the back sheet piece.

  As described above, according to the present invention, it is possible to provide an absorbent article that can reduce wrinkles generated on the back sheet at the step between the region where the absorber is present and the region where the absorber is not present. Can do.

(Configuration of absorbent article according to first embodiment of the present invention)
With reference to FIG.1 and FIG.2, the structure of the absorbent article which concerns on the 1st Embodiment of this invention is demonstrated. FIG. 1 is a plan view of the absorbent article 100 according to the present embodiment as viewed from the top sheet 1 side (the user's skin contact surface side), and FIG. 2 is the absorbent article 100 according to the present embodiment. It is AA 'sectional drawing.

  In the present embodiment, a sanitary napkin is described as a representative of the absorbent article 100 according to the present invention, but the present invention is not limited to this, and is applied to an incontinence pad, a diaper, a panty liner, and the like. Is also applicable.

  As shown in FIGS. 1 and 2, the absorbent article 100 according to the present embodiment is disposed between a liquid-permeable top sheet 1, a liquid-impermeable back sheet, and the top sheet 1 and the back sheet. And the flap portion 20 formed on the outer side of the absorbent article 100 in the width direction W with respect to the absorbent body 2. A liquid permeable sheet may be disposed between the top sheet 1 and the absorbent body 2.

  The top sheet 1 is made of a sheet-like arbitrary liquid permeable material. For example, the top sheet 1 may be constituted by a woven fabric or a nonwoven fabric.

  The absorbent body 2 is configured so as to be able to retain absorption of liquid (menstrual blood), and is preferably bulky, hardly deformed, and has little chemical stimulation.

  For example, the absorbent body 3 is made of cellulose such as pulverized pulp or cotton, regenerated cellulose such as rayon or fibril rayon, semi-synthetic cellulose such as acetate or triacetate, particulate polymer, fibrous polymer, thermoplastic hydrophobic chemical fiber, or hydrophilic. Thermoplastic hydrophobic chemical fibers that have been subjected to chemical treatment, airlaid pulp that has been subjected to chemical bond treatment, or the like may be formed singly or in combination.

  The back sheet is composed of a plurality of back sheet pieces. In the present embodiment, the back sheet is composed of one first back sheet piece 4 and two second back sheet pieces 5. The first back sheet piece 4 is provided in a central region in the width direction W of the absorbent article 100, and each second back sheet piece 5 is in the width direction of the absorbent article 100 with respect to the first back sheet piece 4. It is arranged outside W.

  In addition, the 1st back sheet piece 4 and the 2nd back sheet piece 5 may be formed by dividing | segmenting the same material with a slit, or may be formed by another material. Good.

  For example, in a back sheet composed of a material having air permeability, for example, an air permeable back sheet in which an inorganic substance such as calcium carbonate is mixed, by forming a cavity around the inorganic substance by applying tension, air permeability However, on the other hand, the tear strength as a material becomes weak, and the cost due to the additive becomes more expensive.

  Therefore, the above-mentioned breathable back sheet is adopted only at the portion (first back sheet piece 4) facing the absorbent body 2 where body fluid is easy to touch, and the flap portion 20 (second back sheet piece 5) is non-breathable. By adopting a back sheet, product performance can be improved while suppressing an increase in cost.

  The material that can be selected as the first backsheet piece 4 and the second backsheet piece 5 is not particularly limited, but it is smooth like a film in order to apply the adhesive 6 and the adhesives 8 and 9 for fixing the shorts. And what has high adhesiveness with the adhesive agents 6, 8, and 9 is preferable.

  Further, the joining area A where the backsheet pieces are joined, that is, the joining area A where the first backsheet piece 4 and the second backsheet piece 5 are joined is in the longitudinal direction L of the absorbent article 100. It is provided along.

  Thus, since the area of each back sheet piece is smaller than using a plurality of back sheet pieces to form the flap portion 20 with a single back sheet, wrinkles are less likely to be handled.

  In particular, at the time of removal, the absorbent article 100 is often peeled off from the front to the back along the longitudinal direction. Therefore, if there is a joining region A along the longitudinal direction, the resistance applied to the sheet edge when peeling off is small. For this reason, the backsheet pieces are not easily separated from each other.

  Further, the joining region A between the first backsheet piece 4 and the second backsheet piece 5 is disposed on the inner side in the width direction W of the absorbent article 100 with respect to the root R of the flap portion 20.

  As a result, since the joining area A fits in the width direction inside of the crotch part of the shorts, when the flap portion 20 (wing) is wound around the shorts, the joining area A is unlikely to become an obstacle, and the back sheet pieces Is difficult to peel off.

  Also, if there is a joining region A outside the root R of the flap portion 20, the backsheet pieces overlap each other in the thickness direction in the flap portion 20, so the backsheet becomes harder or increases in thickness. Although it becomes easy to get stuffy, the flap part 20 is formed only from the 2nd back seat | sheet piece 5 by having the joining area | region A inside the base R of the flap part 20, and can ensure a softness | flexibility and air permeability.

  Further, the dimension X1 in the width direction of the first back sheet piece 4 is longer than the dimension X2 in the width direction of the absorber 2.

  As described above, the first back sheet piece 4 covers the absorbent body 2, so that menstrual blood or the like hardly leaks from the joining region A.

  Further, the first back sheet piece 4 is arranged closer to the skin contact surface side in the thickness direction T of the absorbent article 100 than the second back sheet piece 5.

  Furthermore, in the joining area | region A of the 1st back sheet piece 4 and the 2nd back sheet piece 5, the said 1st back sheet piece or said 2nd currently formed in the non-skin contact surface side of the thickness direction of an absorbent article. An adhesive 6 is applied to the end of the backsheet piece.

  As a result, the end of one backsheet piece formed on the non-skin contact surface side is joined to the other backsheet piece, so the end of the backsheet piece exposed on the non-skin contact surface side The part is not peeled off and hardly peeled off, and the adhesive 6 can also serve as a locking material for the underwear.

  The flap portion 20 is composed of at least the side seat 3 and the back seat pieces 4 and 5.

(Method for manufacturing absorbent article according to first embodiment of the present invention)
Hereinafter, with reference to FIG. 3, the manufacturing method of the absorbent article 100 which concerns on this embodiment is demonstrated easily.

  As shown in FIG. 3, first, a topsheet continuous body 1A is placed on and joined to a sidesheet continuous body 3A, and an absorbent body 2 is placed on and joined to the topsheet continuous body 1A. To do. Here, for example, the width of the absorber 2 is 60 to 70 mm.

  Second, the continuous sheet 45A continuously conveyed by the slit 13 is divided into a continuous body 4A of the first backsheet piece and a continuous body 5A of the second backsheet piece. Here, for example, the width of the continuous body 4A of the first back sheet piece is 85 mm, and the width of the continuous body 5A of the second back sheet piece is 50 mm.

  Third, the first backsheet piece continuum 4A is placed on the first continuum comprising the sidesheet continuum 3A, the topsheet continuum 1A, and the absorber 2 so as to cover the absorber 2. Place and join.

  Here, the first continuous body and the continuous body 4A of the first backsheet piece are joined by the adhesive 8 applied to the continuous body 4A of the first backsheet piece.

In the example of FIG. 3, rubber-based HMA 5 g / m ² is applied in a spail shape as the adhesive 8, and the tensile strength in the width direction W between the above-described continuous body and the continuous body 4A of the first backsheet piece. Is kept above 3N.

  As a result, it is possible to prevent tearing of the back sheet when peeling off the absorbent article 100 from shorts after use, and to prevent peeling when the flap portion 20 is folded in the production line. Can do.

  For example, the distance from the side edge 11 of the continuous body 4A of the first backsheet piece to the side edge 21 of the absorber is in the range of 5 mm to 20 mm.

  As a result, since the distance from the side edge portion 21 of the absorbent body 2 to the side edge portion 11A of the continuous body 4A of the first backsheet piece is short, the wrinkles of the backsheet that are likely to occur from a step due to the thickness of the absorbent body 2 are reduced. , It becomes easier to extrude and form a surface.

  Here, when the distance is 20 mm or more, the distance from the portion (side edge portion of the absorber 2) 21 where wrinkles occur to the side edge portion 11A of the continuous body 4A of the first backsheet piece is long. In the production line, such a wrinkle cannot escape to the outside, and the possibility that the wrinkle enters the absorbent article 100 increases.

  When the distance is 5 mm or less, the joining region A between the continuous body 4A of the first backsheet piece and the continuous body 5A of the second backsheet piece is more than the stepped portion due to meandering of the material being manufactured. It arrange | positions inside the width direction W of the absorbent article 100, and the continuous body 5A of a 2nd back sheet piece will swell up, and it will become easy to generate | occur | produce a wrinkle.

  Moreover, it will become more efficient if the bag is made to escape outside by applying air from the central region of the absorbent article 100 toward the side edge on the production line.

  Fourth, a second backsheet piece continuum 5A on a second continuum comprising a sidesheet continuum 3A, a topsheet continuum 1A, an absorber 2 and a first backsheet piece continuum 4A. Is placed and joined.

  Here, the above-described second continuous body and the second backsheet piece continuous body 5A are joined by the adhesive 9 applied to the second backsheet piece continuous body 5A.

  5thly, the continuous body of the absorbent article 100 currently conveyed continuously is cut | disconnected so that it may become the shape of the absorbent article 100 with a product cutter.

(Operation and Effect of Absorbent Article and Manufacturing Method of Absorbent Article According to First Embodiment of the Present Invention)
According to the absorbent article and the method for manufacturing an absorbent article according to the first embodiment of the present invention, the back sheet that covers the entire absorbent article 100 is constituted by the plurality of back sheet pieces 4, 5. Generating wrinkles on the entire back sheet by joining the continuous body 5A of the second back sheet piece while letting the wrinkles generated on the continuous body 4A of the first back sheet piece arranged in the region escape to the side edge portion. The back sheet can be formed with a uniform plane.

  Further, according to the absorbent article and the method for manufacturing an absorbent article according to the first embodiment of the present invention, in the member constituting the absorbent article 100, in the vicinity of the step that can be made near the two bulky absorber layers. By forming the joining area A between the first backsheet piece 4 and the second backsheet piece 5, the wrinkles of the backsheet that are likely to occur due to a step are on the side of the first backsheet piece 4 or the second backsheet piece 5 Since it becomes easy to escape from the edge, the back sheet can be kept flat.

  Moreover, according to the absorbent article which concerns on the 1st Embodiment of this invention, and the manufacturing method of an absorbent article, in the location 5-20 mm away from the side edge part of the absorber 2, the 1st back sheet piece 4 and By forming the joining area A with the second backsheet piece 5, the production speed is increased and even if the wrinkles are more difficult to control, the step and the first backsheet piece 4 or the second backsheet Since the distance to the side edge of the piece 5 is small, wrinkles generated near the step can be buffered.

  Moreover, according to the absorbent article and the method for manufacturing an absorbent article according to the first embodiment of the present invention, the dimension X1 in the width direction of the first back sheet piece 4 facing the central region of the absorbent body 2 is absorbed. Since it is wider than the dimension X2 in the width direction of the body 2, the dimension in the width direction of the second backsheet piece 5 facing the flap portion 20 can be designed to be small, so that the wrinkles can escape from the thicker to the thinner. And it is possible to make the backsheet wrinkle less likely to occur.

  Furthermore, according to the absorbent article and the method for manufacturing an absorbent article according to the first embodiment of the present invention, the dimension X1 in the width direction of the first back sheet piece 4 facing the central region of the absorbent body 2 is absorbed. Since it is wider than the dimension X2 in the width direction of the body 2, it can be designed without arranging the side edge portion of the first backsheet piece 4 between the absorbent body 2 and the shorts. Since the second back sheet piece 5 and the top sheet 1 are bonded to each other by the adhesives 8 and 9, even if a gap is formed in the vicinity of the absorbent body 2, leakage of menstrual blood can be reduced. .

(Absorbent article and manufacturing method of absorbent article according to second embodiment of the present invention)
Hereinafter, with reference to FIG. 4 thru | or FIG. 6, about the absorbent article which concerns on the 2nd Embodiment of this invention, and the manufacturing method of an absorbent article, the absorbent article which concerns on the above-mentioned 1st Embodiment, and an absorbent article Description will be made by paying attention to differences from the manufacturing method.

  As shown in FIGS. 4 and 5, in the absorbent article 100 according to the present embodiment, the first backsheet piece 4 is more non-skin in the thickness direction T of the absorbent article 100 than the second backsheet piece 5. It is arranged on the contact side.

  As described above, when the second backsheet piece 5 is joined by the absorbent body 2 and the first backsheet piece 4 in the thickness direction, even when the flap portion 20 is wound around the shorts or peeled off from the shorts, the joining region In A, the backsheet pieces are difficult to peel apart.

  Moreover, in the absorbent article 100 according to the present embodiment, the joining region A between the first backsheet piece 4 and the second backsheet piece 5 is not formed over the entire region in the longitudinal direction L of the absorbent article 100. .

  Next, with reference to FIG. 6, the manufacturing method of the absorbent article which concerns on this embodiment is demonstrated.

  As shown in FIG. 6, first, a topsheet continuum 1A is placed on and joined to a sidesheet continuum 3A, and an absorber 2 is placed on and joined to the topsheet continuum 1A. To do.

  Secondly, the continuous body 5 </ b> A of the second backsheet piece being continuously conveyed is intermittently cut by the cutter 15 so as to have the shape of the second backsheet piece 5.

  Thirdly, the second backsheet piece 5 cut intermittently is placed on and joined to the first continuum composed of the continuum 3A of the side sheet, the continuum 1A of the top sheet, and the absorber 2. Thus, the second continuous body is formed.

  Fourth, the continuous body of the absorbent article 100 is formed by joining the continuous body 4 of the first backsheet piece that is continuously conveyed so as to cover the absorbent body 2 with respect to the second continuous body. To do.

  5thly, the continuous body of the absorbent article 100 currently conveyed is cut | disconnected so that it may become the shape of the absorbent article 100 with a product cutter (not shown).

  According to the present embodiment, the longitudinal dimension of the absorbent article 100 of the second backsheet piece 5 can be shorter than the longitudinal dimension of the absorbent article 100 of the first backsheet piece 4, and thus the manufacturing cost. Can be reduced.

  Here, for example, the longitudinal direction of the absorbent article 100 of the second backsheet piece 5 is preferably 40 mm or more. If the longitudinal direction of the absorbent article 100 of the second backsheet piece 5 is 40 mm or more, it becomes easy to transfer to an accurate position on the first continuous body after being intermittently cut by the cutter 15. .

(Absorbent article and manufacturing method of absorbent article according to third embodiment of the present invention)
Hereinafter, with reference to FIG.7 and FIG.8, about the absorbent article which concerns on the 3rd Embodiment of this invention, and the manufacturing method of an absorbent article, the absorbent article which concerns on the above-mentioned 1st and 2nd embodiment, and It demonstrates paying attention to difference with the manufacturing method of an absorbent article.

  As shown in FIG. 7, in the absorbent article 100 according to the present embodiment, the inner end 12 in the width direction W of the absorbent article 100 of the second backsheet piece 5 is between the topsheet 1 and the sidesheet 3. Is arranged.

  As a result, since the liquid-impermeable second backsheet piece 5 is disposed between the side sheet 3 and the absorbent body 2, menstrual blood once absorbed by the absorbent body 2 is absorbed to the side sheet 3. Even if the body pressure is applied after diffusing in 2, it is difficult for the liquid to return to the side sheet 2 so that the skin is hardly soiled.

  Further, as shown in FIG. 7, in the absorbent article 100 according to the present embodiment, the first back sheet piece 4 is not in contact with the skin in the thickness direction T of the absorbent article 100 than the second back sheet piece 5. It is arranged on the surface side.

  As described above, when the second backsheet piece 5 is joined by the absorbent body 2 and the first backsheet piece 4 in the thickness direction, even when the flap portion 20 is wound around the shorts or peeled off from the shorts, the joining region In A, the backsheet pieces are difficult to peel apart.

  Next, with reference to FIG. 8, the manufacturing method of the absorbent article which concerns on this embodiment is demonstrated.

  As shown in FIG. 8, first, the continuous body 5 </ b> A of the second backsheet piece that is continuously conveyed is intermittently cut by the cutter 15 so as to be the second backsheet piece 5 having a predetermined shape. These are arranged in a region in the vicinity of the center line in the conveyance direction of the continuous body 3A of the side sheets that are continuously conveyed.

  Here, the second back sheet piece 5 and the side sheet continuous body 3A are joined together by an adhesive 9 applied to the side sheet continuous body 3A.

  Secondly, the cutter 16 divides the side sheet continuous body 3A on which the second backsheet piece 5 is arranged into two along the center line in the transport direction.

  Third, after the conveyance position of the divided two side sheet continuous body 3A is changed, the continuous sheet 1A of the top sheet that is continuously conveyed is arranged between the two side sheet continuous bodies 3A. In this way, the first continuous body is formed by joining the continuous body 1A of the top sheet and the continuous body 3A of the two side sheets.

  Fourth, the second continuum is formed by disposing the absorber 2 on the first continuum that is continuously conveyed.

  Fifthly, by joining the continuous body 4A of the first backsheet piece and the second continuous body so as to cover the absorbent body 3 with the continuous body 4A of the first backsheet piece being continuously conveyed, the absorbency A continuum of articles 100 is formed.

  6thly, the continuous body of the absorbent article 100 currently conveyed is cut | disconnected so that it may become the shape of the absorbent article 100 with a product cutter (not shown).

  According to this embodiment, since there is only one step related to intermittent cutting and transfer (cut transfer) for the continuous body 5A of the second backsheet piece, adjustment of manufacturing conditions is facilitated.

  According to the present embodiment, intermittent cutting and transfer are performed on the continuous body 5A of the second backsheet piece, so that the transfer performance is higher than that in the case of performing intermittent cutting and transfer on the second backsheet piece 5. Due to the improvement, manufacturing errors are less likely to occur.

  According to the present embodiment, as shown in FIG. 7, the inner end 12 in the width direction W of the absorbent article 100 of the second backsheet piece 5 is disposed between the topsheet 1 and the sidesheet 3. Therefore, when the product is actually used, even if the absorbent body 2 sucks the body fluid to the vicinity of the side edge portion, the region of the side edge portion is the first backsheet piece 4 and the second backsheet piece 5. Therefore, even if a straddle load is applied to the side edge, the liquid is less likely to ooze out in the direction of the side edge.

  Although the present invention has been described in detail using the above-described embodiments, it is obvious to those skilled in the art that the present invention is not limited to the embodiments described in this specification. The present invention can be implemented as modified and changed modes without departing from the spirit and scope of the present invention defined by the description of the scope of claims. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention.

It is the top view seen from the back sheet side of the absorptive article concerning a 1st embodiment of the present invention. It is AA sectional drawing of FIG. It is a figure for demonstrating an example of the manufacturing method of the absorbent article which concerns on the 1st Embodiment of this invention. It is the top view seen from the back sheet side of the absorptive article concerning a 2nd embodiment of the present invention. It is BB sectional drawing of FIG. It is a figure for demonstrating an example of the manufacturing method of the absorbent article which concerns on the 2nd Embodiment of this invention. It is a figure corresponded in BB sectional drawing of FIG. 4 of the absorbent article which concerns on the 3rd Embodiment of this invention. It is a figure for demonstrating an example of the manufacturing method of the absorbent article which concerns on the 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Absorbent article 1 ... Top sheet 2 ... Absorber 3 ... Side sheet 4 ... First back sheet piece 5 ... Second back sheet piece 6, 7, 8, 9 ... Adhesive 11 ... First back sheet piece side Edge 12 ... Side edge 20 of second backsheet piece ... Flap part

Claims (6)

An absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, a side sheet, and an absorber disposed between the top sheet and the back sheet,
The backsheet is composed of a plurality of backsheet pieces,
The joining region where the backsheet pieces are joined together is provided along the longitudinal direction of the absorbent article,
The flap part formed in the width direction outer side of the said absorbent article with respect to the said absorber is comprised by the said side sheet and the said back sheet piece at least, The absorbent article characterized by the above-mentioned. The plurality of backsheet pieces include a first backsheet piece provided in a central region in the width direction of the absorbent article, and an outer side in the width direction of the absorbent article with respect to the first backsheet piece. A second backsheet piece is included,
The absorbent article according to claim 1, wherein a dimension of the first backsheet piece in a width direction is longer than a dimension of the absorbent body in the width direction.   The joining area | region of a said 1st back sheet piece and a said 2nd back sheet piece is arrange | positioned inside the width direction of the said absorbent article rather than the base of the said flap part, The Claim 2 characterized by the above-mentioned. The absorbent article as described.   The absorbent article according to claim 2, wherein the first back sheet piece is disposed closer to the non-skin contact surface side in the thickness direction of the absorbent article than the second back sheet piece. .   The absorbent article according to claim 2, wherein an inner end portion of the second backsheet piece in the width direction of the absorbent article is disposed between the top sheet and the side sheet.   The first backsheet piece or the second backsheet formed on the non-skin contact surface side in the thickness direction of the absorbent article in the joining region between the first backsheet piece and the second backsheet piece. The absorbent article according to claim 2, wherein an adhesive is applied to an end of the piece.

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