JP6027861B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article such as a disposable diaper.

  In general, an absorbent body provided in an absorbent article such as a disposable diaper is obtained by wrapping a liquid-retaining absorbent core with a core wrap sheet such as a nonwoven fabric, and adhesively fixing the absorbent core and the core wrap sheet with an adhesive. It is formed by. For example, in Patent Document 1, a first sheet is bonded to an entire lower surface of an absorbent material via an adhesive applied in a spiral shape, and an adhesive applied in a stripe shape to the upper surface of the absorbent material is disclosed. An absorbent article provided with an absorbent body formed by bonding a second sheet through is described. Patent Document 2 discloses a body fluid absorbent article including an absorbent body in which an absorbent composite is wrapped with a polypropylene nonwoven fabric and bonded with a hot melt adhesive in which the absorbent composite and the polypropylene nonwoven fabric are applied in a linear pattern. Have been described. Further, Patent Document 3 discloses a hot melt adhesive in which a first thin paper is bonded to a top surface of an absorbent mat via a hot melt adhesive applied in a screen shape, and applied to a bottom surface of the absorbent material in a screen shape. A disposable product absorbent body formed by adhering a second thin paper through a sheet is described.

Japanese Patent No. 4444220 Japanese Patent No. 4840905 JP-A-6-311998

  However, as in the absorbent article described in Patent Document 1, the absorbent core's water-absorbing polymer absorbs body fluids such as urine and menstrual blood simply by applying an adhesive spirally to the entire lower surface of the absorbent material. If the absorbent core is deformed at the boundary between the hygroscopic portion of the absorbent core that has been absorbed and swollen and the dry portion of the absorbent core that is not absorbed by the water-absorbing polymer, the bond between the absorbent material and the first sheet comes off. It was easy and the absorber could collapse. If the absorbent body is worn in such a state, the crotch portion is irregularly deformed to hinder walking, or the wearer may feel uncomfortable wearing. Moreover, if the absorbent body is worn in such a collapsed state, urine leakage may be caused.

  Patent Document 2 describes that a hot-melt adhesive is applied in a linear pattern on the upper and lower surfaces of the absorbent composite, but the linear coating applied on the upper surface of the absorbent composite. There is no description of an appropriate arrangement relationship between the pattern hot melt adhesive and the linear pattern hot melt adhesive applied to the lower surface of the absorbent composite.

Patent Document 3 also discloses a hot-melt adhesive applied in a screen shape on the upper surface of the absorbent mat and a screen-like material on the lower surface of the absorbent material, as in the absorbent body of the body fluid absorbent article described in Patent Document 2. There is no description of an appropriate arrangement relationship with the hot melt adhesive applied to the film.
Therefore, this invention relates to providing the absorbent article which can eliminate the malfunction mentioned above.

  The present invention is an absorbent article comprising a top sheet disposed on the skin facing surface side, a back sheet disposed on the non-skin facing surface side, and a vertically long absorbent disposed between the two sheets. The absorbent body has an absorbent core containing an absorbent polymer and a coating material that wraps the absorbent core, and the skin-side coating material on the skin-facing surface side of the coating material and the skin-facing surface of the absorbent core Are fixed via a skin-side adhesive, and the non-skin-side coating material on the non-skin facing surface side of the coating material and the non-skin facing surface of the absorbent core are fixed via a non-skin-side adhesive. Each of the skin-side adhesives and each of the non-skin-side adhesives are thick lines that extend linearly in the longitudinal direction of the absorber, and are intermittently spaced apart in the lateral direction of the absorber. When the absorbent body in the crotch part of the absorbent article is viewed in plan, each skin side The position of the center line of the thick line extending in the vertical direction of the dressing and the position of the center line of the thick line extending in the vertical direction of each non-skin side adhesive are shifted in the lateral direction of the absorbent body, and the skin side adhesion The present invention provides an absorbent article in which the number of thick lines coated with an agent is less than the number of thick lines coated with the non-skin-side adhesive.

  According to the absorbent article of the present invention, the adhesion between the absorbent core and the core wrap sheet is difficult to come off, and the absorbent body is difficult to collapse. Thus, since an absorber does not collapse easily, even if it wears the absorptive article of the present invention, it is easy to walk and a wearer's wearing feeling improves and it is hard to cause urine leakage.

FIG. 1 is a partially broken plan view of an unfolded disposable diaper according to an embodiment of the present invention as viewed from the surface sheet side. 2 is a cross-sectional view taken along the line II of FIG.

  Hereinafter, the absorbent article of this invention is demonstrated based on the preferable embodiment, referring FIGS. 1-2. FIG. 1 is a partially broken plan view of an unfolded disposable diaper according to an embodiment of the present invention as viewed from the surface sheet side, and FIG. 2 is a cross-sectional view taken along the line II of FIG. ing.

  As shown in FIG. 1, the disposable diaper 1 of the present embodiment (hereinafter also referred to as “diaper 1”) has a top sheet 2 disposed on the skin facing surface side and a back surface disposed on the non-skin facing surface side. A sheet 3 and a vertically long absorbent body 4 disposed between the sheets 2 and 3 are provided. As shown in FIG. 1, the diaper 1 is formed symmetrically with respect to a center line CL extending in the vertical direction.

The diaper 1 of the present embodiment will be described in detail. As shown in FIG. 1, the diaper 1 is in a vertical direction (hereinafter also referred to as “Y direction”. Y direction: a direction parallel to the center line CL). It has an abdominal side A, a back side B, and a crotch C positioned between these A and B. The abdomen A is a part located on the wearer's abdomen when the diaper is worn, the dorsal part B is a part located on the wearer's back, and the crotch C is located on the inseam of the wearer. It is a part to do. The crotch part C is located in the central part of the diaper 1 in the vertical direction (Y direction). In addition, the direction orthogonal to the vertical direction (Y direction) will be described as the horizontal direction of the diaper 1 (hereinafter also referred to as “X direction”).
Moreover, in this specification, a "skin opposing surface" is a surface distribute | arranged to a wearer's skin side at the time of wear among the front and back both surfaces of each member, such as the surface sheet 2 which comprises the diaper 1, The “skin facing surface” is a surface of the front and back surfaces of each member such as the surface sheet 2 that is directed to the side opposite to the wearer's skin side when worn.

  As shown in FIG. 1, the diaper 1 has left and right side edges along the longitudinal direction (Y direction) of the ventral side A and left and right side edges along the longitudinal direction (Y direction) of the back side B, respectively. It extends outward in the horizontal direction (X direction) from the left and right side edges along the vertical direction (Y direction). The left and right side edges of the crotch part C are curved in an arc shape inward in the lateral direction (X direction), and the central part in the longitudinal direction (Y direction) is constricted inward as a whole. Yes.

  The top sheet 2 and the back sheet 3 of the diaper 1 respectively extend outward from left and right side edges along the longitudinal direction (Y direction) of the absorbent body 4 and front and rear end edges in the longitudinal direction (Y direction). As shown in FIG. 2, the surface sheet 2 has a lateral dimension (X direction) smaller than a lateral dimension (X direction) of the back sheet 3. Each of the top sheet 2 and the back sheet 3 has a general adhesive or a fusing unit directly or with another member interposed in the extending portion extending outward from the outer peripheral edge of the absorber 4. They are joined together, and the absorber 4 is sandwiched and fixed.

  As shown in FIG. 1, the diaper 1 is a so-called unfolded diaper, and a pair of fastening tapes 7 and 7 are provided on both left and right edges along the longitudinal direction (Y direction) of the dorsal side B. A landing tape 8 for fastening the fastening tapes 7 and 7 is provided on the outer surface (non-skin facing surface) of the part A. As shown in FIGS. 1 and 2, elastic members 61 for forming a three-dimensional gather that are fixed in a stretched state in the Y direction are arranged in the lateral direction (X direction) on both side portions along the longitudinal direction (Y direction) of the diaper 1. ) The gather forming sheet 62 on the inner side (center line CL side) is arranged on the skin facing surface of the top sheet 2, and the side of the top sheet 2 and the side of the top sheet 2 in the back sheet 33 X It arrange | positions to the extension part of the direction outward, and is fixed using the general adhesive agent or the melt | fusion means, and this forms a pair of solid gathers TG and TG (refer FIG. 2). Further, as shown in FIG. 1, a plurality of legs for forming leg gathers are formed on both sides along the longitudinal direction (Y direction) of the diaper 1 outward in the lateral direction (X direction) from the elastic member 61. The gather forming elastic members 63 are arranged in an extended state in the Y direction, and the leg gathers LG and LG are formed by contraction of the leg gather forming elastic members 63. Moreover, as shown in FIG. 1, the waist part elastic member 64 for waist gather formation is distribute | arranged to the expansion | extension state in the X direction at the longitudinal direction (Y direction) edge part by the side of the back side B of the diaper 1. A waist gather is formed by the contraction of the waist elastic member 64.

  As shown in FIGS. 1 and 2, the absorbent body 4 has an absorbent core 41 containing an absorbent polymer and a covering material 42 that wraps the absorbent core 41. In the diaper 1, the absorbent body 4 is formed by coating a liquid-retaining absorbent core 41 that is long in the longitudinal direction (Y direction) with a covering material 42 that is a liquid-permeable hydrophilic sheet.

  In the diaper 1, the absorbent core 41 has both side edges along the longitudinal direction (Y direction) on the ventral side A side and both sides along the longitudinal direction (Y direction) on the back side B side, as shown in FIG. 1. Each edge extends outward in the lateral direction (X direction) from both side edges along the longitudinal direction (Y direction) of the crotch C, and as a whole is closer to the ventral side A from the central part in the longitudinal direction (Y direction). The portion is formed in an inwardly bound shape. Moreover, as for the absorptive core 41, in the diaper 1, as shown in FIG. 2, each skin opposing surface and non-skin opposing surface of the absorptive core 41 are flat. Furthermore, in the diaper 1, as shown in FIG. 2, the absorbent core 41 has a pulp single layer 410 formed on the most non-skin facing surface side. Thus, as for the absorptive core 41 of the diaper 1, the layer 410 on the most non-skin facing surface side is a layer of a single pulp, and a layer other than the layer 410 is a mixed layer of pulp and absorbent polymer.

  The absorbent core 41 of the diaper 1 described above uses, for example, a suction drum having a suction port having a shape corresponding to the shape of the absorbent core 41 on the peripheral surface, and first sucks only pulp into the suction port. Only the pulp is deposited, and then the mixture of pulp and absorbent polymer is sucked to fill the suction port with the deposit, and then the deposit at the suction port is transferred onto the vacuum conveyor using, for example, a vacuum conveyor Can be manufactured. In the absorbent core 41 manufactured in this way, the pulp single layer 410 and layers other than the layer 410 are integrally formed continuously.

As shown in FIGS. 1 and 2, the absorbent body 4 has a skin-side bonding between a skin-side coating material 421 on the skin-facing surface side and a skin-facing surface 41 </ b> T of the absorbent core 41 in the coating material 42 that wraps the absorbent core 41. The non-skin side covering material 422 on the non-skin facing surface side of the covering material 42 and the non-skin facing surface 41U of the absorbent core 41 are fixed through the agent 5T (see FIG. 2 (a)). It is fixed and formed via 5U (refer FIG.2 (b)). In the diaper 1, as shown in FIG. 2, both sides of the covering material 42 are folded using a single covering material 42, and the side edges of the covering material 42 are disposed on the back sheet 3 side of the absorbent core 41. The absorbent core 41 is wrapped so as to overlap each other. Therefore, in one covering material 42, the portion disposed on the skin facing surface 41 </ b> T side of the absorbent core 41 becomes the skin side covering material 421, and the portion disposed on the non-skin facing surface 41 </ b> U side of the absorbent core 41. A non-skin side covering material 422 is formed. In the diaper 1, as described above, the skin-side coating material 421 and the non-skin-side coating material 422 are formed from one coating material 42, but may be formed from two separate coating materials. Good. The basis weight of the absorbent core 41 is preferably 300 g / m ² or more and 600 g / m ² or less, and the basis weight of the covering material 42 is preferably 10 g / m ² or more and 30 g / m ² or less.

  In the present invention, each skin-side adhesive 5T and each non-skin-side adhesive 5U are bold lines extending linearly in the longitudinal direction (Y direction) of the absorbent body 4, and intermittent in the lateral direction (X direction) of the absorbent body 4. Are spaced apart and applied in stripes. More specifically, the skin-side adhesive 5T and the non-skin-side adhesive 5U are intermittently disposed in the absorbent body lateral direction (X direction) of the diaper 1 as shown in FIGS. 2 (a) and 2 (b). And it is applied in a straight line in the vertical direction (Y direction) to form a plurality of thick lines. In the diaper 1, the skin-side adhesive 5 </ b> T is intermittently applied in the lateral direction (X direction) using, for example, a coater gun, as shown in FIG. 2A, and the longitudinal direction of the absorbent core 41 ( A plurality of thick lines are applied linearly to the skin facing surface 41T over the entire length in the Y direction), and are applied in stripes as viewed in plan. Similarly, as shown in FIG. 2B, the non-skin side adhesive 5U is also applied intermittently in the lateral direction (X direction) using, for example, a coater gun, and the longitudinal direction (Y A plurality of thick lines are linearly applied to the non-skin facing surface 41U over the entire length of the direction), and are applied in stripes in plan view.

  The thick line (skin-side adhesive 5T, non-skin-side adhesive 5U) in the present invention is formed by applying the applied adhesive in a straight line in the longitudinal direction (Y direction) of the absorbent body 4 in a rectangular shape in plan view. The width of the application in plan view is substantially uniform over the entire length of the absorbent body 4, and the width is within the range of ± 1 mm with respect to the application width obtained by averaging the total length of the thick lines. The thick lines (skin-side adhesive 5T, non-skin-side adhesive 5U) are applied in stripes continuously in parallel without crossing each other. The thick line (skin-side adhesive 5T, non-skin-side adhesive 5U) has a rectangular shape or a semicircular shape or a convex lens shape in which the skin-facing surface side is raised and rounded on the skin side. Thus, each skin side adhesive 5T and each non-skin side adhesive 5U are formed by being applied in a thick line shape.

  In this invention, as shown in FIG.1 and FIG.2, when the absorber 4 in the crotch part C of the diaper 1 is planarly viewed, the centerline of the thick line extended in the vertical direction (Y direction) of each skin side adhesive 5T The position of 5T1 and the position of the thick center line 5U1 extending in the longitudinal direction (Y direction) of each non-skin-side adhesive 5U are shifted in the lateral direction (X direction) of the absorbent body 4, and the skin-side adhesive 5T. The number of thick lines applied is less than the number of thick lines applied with the non-skin-side adhesive 5U. In the diaper 1, as shown in FIG. 2, when the absorbent body 4 of the crotch part C of the diaper 1 is viewed in plan, the position of the thick line of the skin side adhesive 5T and the position of the thick line of the non-skin side adhesive 5U are , Are alternately shifted in the lateral direction (X direction). The number of thick lines applied to the skin-side adhesive 5T is preferably 1 or more, more preferably 3 or more, and preferably 50 or less, more preferably 40 or less, specifically 1 The number is preferably 50 or more and 50 or less, more preferably 3 or more and 40 or less. In the diaper 1, three are provided. The number of thick lines applied to the non-skin side adhesive 5U is preferably 1 or more, more preferably 3 or more, and preferably 60 or less, more preferably 50 or less, specifically Is preferably 1 or more and 60 or less, more preferably 3 or more and 50 or less. In the diaper 1, four are arranged.

  Each skin-side adhesive 5T has a width W1 of the thick line that does not hinder liquid permeability to the absorbent core, and from the viewpoint of firmly fixing the absorbent core, than the width W2 of the thick line of each non-skin-side adhesive 5U. It is preferable that it is narrow. Each skin-side adhesive 5T has a width W1 of the thick line of preferably 1 mm or more, more preferably 2 mm or more, preferably 10 mm or less, more preferably 5 mm or less, and specifically 1 mm or more. It is preferably 10 mm or less, and more preferably 2 mm or more and 5 mm or less. On the other hand, each non-skin-side adhesive 5U has a thick line width W2 of preferably 2 mm or more, more preferably 5 mm or more, and preferably 15 mm or less, more preferably 10 mm or less. It is preferably 2 mm or more and 15 mm or less, and more preferably 5 mm or more and 10 mm or less. In addition, the width W1 of the thick line of each skin-side adhesive 5T is preferably narrower by 1 mm or more and more preferably 5 mm or more compared to the width W2 of the thick line of each non-skin-side adhesive 5U.

  The distance W3 between the thick lines of the skin-side adhesives 5T and 5T adjacent to each other in the lateral direction (X direction) of the diaper 1 is adjacent to the lateral direction (X direction) of the diaper 1 from the viewpoint of liquid permeability to the absorbent core. It is preferable that the distance W4 between the thick lines of the non-skin side adhesives 5U and 5U is wider. The distance W3 between the thick lines of the skin side adhesives 5T and 5T is preferably 1 mm or more, more preferably 3 mm or more, preferably 30 mm or less, more preferably 20 mm or less, and specifically 1 mm or more. It is preferably 30 mm or less, and more preferably 3 mm or more and 20 mm or less. On the other hand, the distance W4 between the thick lines of the non-skin side adhesives 5U and 5U is preferably 1 mm or more, preferably 20 mm or less, more preferably 10 mm or less, and specifically 1 mm or more and 20 mm or less. It is preferable that it is 1 mm or more and 10 mm or less. In addition, the distance W3 between the thick lines of the skin-side adhesives 5T and 5T is preferably 1 mm or more and preferably 5 mm or more wider than the distance W4 between the thick lines of the non-skin-side adhesives 5U and 5U from the above viewpoint. Is more preferable.

The application basis weight of the skin-side adhesive 5T is preferably 3 g / m ² or more, more preferably 5 g / m ² or more, and preferably 30 g / m ² or less, more preferably 15 g / m ² or less. Specifically, it is preferably 3 g / m ² or more and 30 g / m ² or less, more preferably 5 g / m ² or more and 15 g / m ² or less. The application basis weight of the non-skin side adhesive 5U is preferably 3 g / m ² or more, more preferably 5 g / m ² or more, and preferably 30 g / m ² or less, more preferably 15 g / m ^2. Specifically, it is preferably 3 g / m ² or more and 30 g / m ² or less, more preferably 5 g / m ² or more and 15 g / m ² or less.
The application area ratio of the skin-side adhesive 5T is preferably lower than the application area ratio of the non-skin-side adhesive 5U from the viewpoint of firmly fixing the absorption core without inhibiting liquid permeability to the absorption core. Specifically, the application area ratio of the application of the skin-side adhesive 5T is preferably 10% or more, more preferably 20% or more, preferably 50% or less, more preferably 40% or less, Specifically, it is preferably 10% or more and 50% or less, and more preferably 20% or more and 40% or less. On the other hand, the application area ratio of the non-skin side adhesive 5U is preferably 10% or more, more preferably 20% or more, and preferably 90% or less, more preferably 60% or less. Is preferably 10% or more and 90% or less, and more preferably 20% or more and 60% or less. Further, from the above viewpoint, the application area ratio of the skin-side adhesive 5T is preferably lower by 50% points or more, and more preferably lower by 30% points or more than the application area ratio of the non-skin-side adhesive 5U. The application area ratio of the skin-side adhesive 5T and the non-skin-side adhesive 5U is measured by the following method.

<Measurement method of application area ratio of skin side adhesive 5T and non-skin side adhesive 5U>
Regarding the measurement of the application area ratio of the skin-side adhesive 5T, after spraying toner on a predetermined portion (for example, the crotch C) of the absorbent body 4 on the skin-facing surface side, the adhesive is colored, and then cut into a predetermined size. Measure the colored area. The coated area ratio is obtained by dividing the measured area by the cut-out dimension. The number of measurement points is 3 or more, the average value thereof is obtained, and the application area ratio is calculated. Regarding the measurement of the application area ratio of the non-skin-side adhesive 5U, the measurement is performed in the same manner as the measurement of the application area ratio of the skin-side adhesive 5T, except that the toner is dispersed on the non-skin facing surface side of the absorber 4.

  In the diaper 1, as shown in FIG. 2, in plan view at the crotch part C, the position of the center line 5T1 of the thick line of each skin-side adhesive 5T and the center line 5U1 of the thick line of each non-skin-side adhesive 5U. The position is not only shifted in the X direction, but the position of the thick line of the skin side adhesive 5T and the position of the thick line of the non-skin side adhesive 5U are alternately shifted. Specifically, in the diaper 1, as shown in FIG. 2, the width W1 of the thick line of each skin-side adhesive 5T is narrower than the width W2 of the thick line of each non-skin-side adhesive 5U, and is adjacent to each other. The interval W3 between the thick lines of the skin-side adhesives 5T and 5T is wider than the interval W4 between the adjacent non-skin-side adhesives 5U and 5U. And the width W1 of the thick line of each skin side adhesive 5T is narrower than the space | interval W4 between the thick lines of adjacent non-skin side adhesives 5U and 5U, and the thick line of adjacent non-skin side adhesives 5U and 5U One thick line of the skin-side adhesive 5T is arranged for each range between the two. Further, the width W2 of the thick line of each non-skin-side adhesive 5U is narrower than the interval W3 between the thick lines of the adjacent skin-side adhesives 5T and 5T, and the thick lines of the adjacent skin-side adhesives 5T and 5T are adjacent to each other. A thick line of one non-skin-side adhesive 5U is arranged for each range in between.

The material for forming the diaper 1 of the present embodiment will be described.
As the top sheet 2, the back sheet 3, and the three-dimensional gather forming sheet 62, any sheet can be used without particular limitation as long as it is normally used for absorbent articles such as disposable diapers. For example, as the surface sheet 2, a hydrophilic and liquid-permeable nonwoven fabric, a three-dimensional aperture film, or the like can be used. As the back sheet 3, a liquid-impermeable or liquid-impermeable (including water repellency) resin film, a laminate of the resin film and a nonwoven fabric, or the like can be used. As the three-dimensional gather forming sheet 62, a hydrophobic nonwoven fabric, a woven fabric, or a laminated sheet thereof can be used.
The fastening tape 7 can be used without particular limitation as long as it is usually used for absorbent articles such as disposable diapers. For example, male members in “Magic Tape (registered trademark)” (manufactured by Kuraray Co., Ltd.), “Quicklon (registered trademark)” (manufactured by YKK), “Majikurosu (registered trademark)” (manufactured by Kanebo Bell Touch), etc. Can be used.

As the absorptive core 41 that constitutes the absorbent body 4, a core in which absorbent polymer particles are held in an aggregate of fibers such as pulp can be used. As the covering material 42 constituting the absorbent body 4, a hydrophilic sheet, for example, a core-wrap sheet made of a water-permeable thin paper (tissue paper) or a water-permeable nonwoven fabric can be used.
The elastic member 61 for forming three-dimensional gathers, the elastic member 63 for forming leg gathers, and the elastic member 64 for the waist include natural rubber, polyurethane, polystyrene-polyisoprene copolymer, polystyrene-polybutadiene copolymer, ethyl acrylate. A thread-like stretchable material made of a polyethylene-α-olefin copolymer such as ethylene can be used.

  The skin-side adhesive 5T and the non-skin-side adhesive 5U can be used without particular limitation as long as they are usually used in absorbent articles such as disposable diapers. For example, a hot melt adhesive can be used. it can. Examples of the hot melt adhesive include blocks such as styrene-isoprene-styrene block copolymer (SIS), styrene-butadiene-styrene block copolymer (SBS), and styrene-ethylene-butylene-styrene copolymer (SEBS). The copolymer type hot melt adhesive may be used alone or in combination of two or more.

The effect at the time of using the diaper 1 of embodiment of this invention mentioned above is demonstrated.
The skin-side adhesive 5T and the non-skin-side adhesive 5U in the diaper 1 are, as shown in FIG. The position of the line 5T1 and the position of the center line 5U1 of the thick line of each non-skin-side adhesive 5U extending in a straight line are shifted in the X direction, and the number of thick lines applied to the skin-side adhesive 5T is the non-skin-side adhesive. The number is less than the number of 5 U thick lines. Since the thick line of the skin-side adhesive 5T and the thick line of the non-skin-side adhesive 5U are arranged in this way, even if the absorbent polymer absorbs body fluid such as urine and menstrual blood and swells, the absorbent core 41 and the covering material Adhesion with 42 is difficult to come off and the absorbent body 4 is difficult to collapse. Thus, since the absorber 4 does not collapse easily, even if the diaper 1 is worn, it is easy to walk, the wearer's feeling of wear is improved, and urine leakage is hardly caused.

  Further, as shown in FIG. 2, the diaper 1 has a pulp single-layer 410 formed on the most non-skin facing surface side, and the non-skin-side adhesive 5 </ b> U is formed on the non-skin facing surface 41 </ b> U of the pulp single layer 410. It is applied and fixed to the non-skin side covering material 422 of the covering material 42 and the non-skin facing surface 41U of the absorbent core 41. Thus, since the absorbent polymer that absorbs body fluid and swells is not disposed in the layer 410 of the single pulp, in particular, the non-skin-side covering material 422 of the covering material 42 and the non-skin facing surface 41U of the absorbent core 41 are arranged. Adhesion is further difficult to come off, and the absorber 4 is more difficult to collapse.

  Moreover, as shown in FIG. 2, the position of the thick line of the skin-side adhesive 5T and the position of the thick line of the non-skin-side adhesive 5U are alternately shifted in the diaper 1 so that the adjacent non-skin side One thick line of the skin-side adhesive 5T is arranged for each range between the thick lines of the adhesives 5U and 5U, and one piece for each range between the thick lines of the adjacent skin-side adhesives 5T and 5T. The thick line of the non-skin side adhesive 5U is arranged. Therefore, the adhesion between the absorbent core 41 and the covering material 42 is more difficult to come off, and the absorbent body 4 is more difficult to collapse.

  The disposable diaper which is one embodiment of the absorbent article of the present invention is not limited to the diaper 1 of the above-described embodiment, and can be appropriately changed.

  For example, in the diaper 1 of the above-mentioned embodiment, as shown in FIG. 2, the position of the thick line of the skin-side adhesive 5T and the position of the thick line of the non-skin-side adhesive 5U are alternately shifted, A thick line of one skin side adhesive 5T is arranged for each range within the thick lines between adjacent non-skin side adhesives 5U, 5U, and a range between thick lines of adjacent skin side adhesives 5T, 5T A thick line of one non-skin side adhesive 5U is arranged for each inside. However, the position of the center line 5T1 of the thick line of each skin-side adhesive 5T and the position of the center line 5U1 of the thick line of each non-skin-side adhesive 5U extending in a straight line need only be shifted, for example, the skin side The side part along the vertical direction (Y direction) of the thick line of the adhesive 5T and the side part along the vertical direction (Y direction) of the thick line of the non-skin-side adhesive 5U may be arranged at overlapping positions. Also, the number of thick lines applied to the skin-side adhesive 5T only needs to be smaller than the number of thick lines applied to the non-skin-side adhesive 5U, and is within the range between adjacent thick lines of the skin-side adhesives 5T and 5T. A plurality of thick lines of the non-skin side adhesive 5U may be arranged for each.

  Further, the absorbent article of the present invention may be a pants-type disposable diaper other than the unfolded disposable diaper such as the diaper 1 described above. For example, sanitary napkins, urine pads, etc. other than disposable diapers It may be.

  The following absorbent articles are disclosed regarding the embodiment described above.

<1>
An absorbent article comprising a top sheet disposed on the skin facing surface side, a back sheet disposed on the non-skin facing surface side, and a vertically long absorbent disposed between both the sheets,
The absorbent body has an absorbent core containing an absorbent polymer and a coating material that wraps the absorbent core, and the skin-side coating material on the skin-facing surface side of the coating material and the skin-facing surface of the absorbent core A non-skin-side covering material on the non-skin-facing surface side of the covering material and a non-skin-facing surface of the absorbent core are fixed via a non-skin-side adhesive. And
Each skin-side adhesive and each non-skin-side adhesive is a thick line that extends linearly in the longitudinal direction of the absorbent body, and is intermittently spaced apart in the lateral direction of the absorbent body and applied in stripes. Has been
When the absorbent body in the crotch part of the absorbent article is viewed in plan, the position of the center line of the thick line extending in the vertical direction of each skin-side adhesive and the thick line extending in the vertical direction of each non-skin-side adhesive The position of the center line is shifted in the lateral direction of the absorbent body, and the number of thick lines to which the skin-side adhesive is applied is less than the number of thick lines to which the non-skin-side adhesive is applied. .

<2>
Each said skin side adhesive is an absorbent article as described in said <1> whose width of the thick line is narrower than the width of the thick line of each said non-skin side adhesive.
<3>
The width of the thick line of the skin side adhesive is narrower than the width of the thick line of the non-skin side adhesive, and the width of the thick line of the skin side adhesive is 1 mm or more and 10 mm or less, Preferably, it is 1 mm or more and 5 mm or less, and the non-skin side adhesive has a width of 2 mm or more and 15 mm or less, preferably 2 mm or more and 10 mm or less, preferably <1> or <2> Absorbent article.
<4>
The absorption according to any one of <1> to <3>, wherein a width of the thick line of the skin-side adhesive is 1 mm or more narrower, preferably 5 mm or more narrower than a width of the thick line of the non-skin-side adhesive. Sex goods.
<5>
<1> to << in which the interval between the thick lines of the skin-side adhesive adjacent in the lateral direction of the absorbent body is wider than the interval between the thick lines of the non-skin-side adhesive adjacent in the lateral direction of the absorbent body The absorbent article according to any one of 4>.
<6>
The distance between the thick lines of the skin-side adhesive adjacent in the lateral direction of the absorbent body is wider than the distance between the thick lines of the non-skin-side adhesive adjacent in the lateral direction of the absorbent body. The distance between the thick lines of the side adhesive is 1 mm or more and 30 mm or less, preferably 3 mm or more and 20 mm or less, and the distance between the thick lines of the non-skin side adhesive is 1 mm or more and 20 mm or less, preferably 1 mm or more and 10 mm. The absorbent article according to any one of the above items <1> to <5>.
<7>
The distance between the thick lines of the skin-side adhesive is 1 mm or more, preferably 5 mm or more wider than the distance between the thick lines of the non-skin-side adhesive, according to any one of the above items <1> to <6>. Absorbent articles.
<8>
The width of the thick line of the non-skin side adhesive is narrower than the distance between the thick lines of the adjacent skin side adhesives, one for each range within the thick lines of the adjacent skin side adhesives The absorbent article according to any one of <1> to <7>, wherein a thick line of the non-skin side adhesive is disposed.
<9>
The absorbent article according to any one of <1> to <8>, wherein an application area ratio of the skin side adhesive is lower than an application area ratio of the non-skin side adhesive.
<10>
The application area ratio of the skin side adhesive is lower than the application area ratio of the non-skin side adhesive, and the application area ratio of application of the skin side adhesive is 10% or more and 50% or less, preferably <1> to <9>, which are 20% or more and 40% or less, and the application area ratio of application of the non-skin side adhesive is 10% or more and 90% or less, preferably 20% or more and 60% or less. The absorbent article according to any one of 1.

<11>
The application basis weight of the skin-side adhesive is 3 g / m ² or more and 30 g / m ² or less, preferably 5 g / m ² or more and 15 g / m ² or less, and the application basis weight of the non-skin side adhesive is Is 3 g / m ² or more and 30 g / m ² or less, preferably 5 g / m ² or more and 15 g / m ² or less, the absorbent article according to any one of <1> to <10>.
<12>
<1> to <11>, wherein the number of thick lines applied to the skin-side adhesive is 3 or more and 40 or less, and the number of thick lines applied to the non-skin-side adhesive is 3 or more and 50 or less. The absorbent article according to any one of 1.
<13>
As the top sheet, a hydrophilic and liquid permeable nonwoven fabric or a three-dimensional aperture film is used, and as the back sheet, a liquid impermeable or hardly liquid permeable resin film, a laminate of the resin film and the nonwoven fabric, etc. The absorbent article according to any one of <1> to <12>, wherein
<14>
The said covering material which comprises the said absorber is a hydrophilic sheet | seat, As said hydrophilic sheet | seat, the core wrap sheet | seat which consists of a water-permeable thin paper (tissue paper) or a water-permeable nonwoven fabric is used <1>-< The absorbent article according to any one of 13>.
<15>
The skin side adhesive and the non-skin side adhesive are hot melt adhesives, and examples of the hot melt adhesive include styrene-isoprene-styrene block copolymer (SIS), styrene-butadiene-styrene block copolymer. The absorbent article according to any one of <1> to <14>, wherein the combination (SBS) and the styrene-ethylene-butylene-styrene copolymer (SEBS) are used alone or in combination of two or more.
<16>
The basis weight of the absorbent core is 300 g / m ² or more and 600 g / m ² or less, and the basis weight of the coating material is 10 g / m ² or more and 30 g / m ² or less <1> to < The absorbent article according to any one of 15>.
<17>
The absorbent article according to any one of <1> to <16>, wherein the absorbent article is a disposable diaper.
<18>
The disposable diaper is an unfolded disposable diaper, and the absorbent article according to <17>, wherein a three-dimensional gather and a leg gather are formed on both side portions along the longitudinal direction of the diaper.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, the scope of the present invention is not limited by the examples.

[Example 1]
The absorber 4 with which the diaper shown in FIG.1 and FIG.2 is provided was produced. The absorber 4 will be described in detail. The absorbent core 41 has a total length in the Y direction of 370 mm, a total width in the X direction of 125 mm, and a basis weight of 486 g / m ² . The covering material 42 for wrapping such an absorbent core 41 is composed of one sheet, and the basis weight thereof is 16 g / m ² . The skin side adhesive 5T and the non-skin side adhesive 5U that fix the absorbent core 41 and the covering material 42 will be described in detail. In the absorbent body 4 of Example 1, the position of the thick line of the skin side adhesive 5T and the non-skin The position of the thick line of the skin-side adhesive 5U is alternately arranged so as to be different from each other, and the skin-side adhesive 5T and the non-skin-side adhesive 5U are respectively applied in stripes in plan view. . The number of thick lines applied to the skin-side adhesive 5T was 16, and the number of thick lines applied to the non-skin-side adhesive 5U was 30. The width W1 of the thick line of each skin side adhesive 5T was 2 mm, and the width W2 of the thick line of each non-skin side adhesive 5U was 2 mm. Further, the distance W3 between the thick lines of the adjacent skin-side adhesives 5T and 5T was 5 mm, and the distance W4 between the thick lines of the non-skin-side adhesives 5U and 5U was 2 mm. The application basis weight of the skin-side adhesive 5T was 30 g / m ² , and the application basis weight of the non-skin-side adhesive 5U was 30 g / m ² . The application area ratio of the skin-side adhesive 5T was 29%, and the application area ratio of the non-skin-side adhesive 5U was 50%.

[Example 2]
Similarly to Example 1, an absorbent body 4 provided with the diaper shown in FIGS. 1 and 2 was produced.
The skin side adhesive 5T and the non-skin side adhesive 5U that fix the absorbent core 41 and the covering material 42 will be described in detail. In the absorbent body 4 of Example 2, the center line of the thick line of the skin side adhesive 5T The position of the center line of the non-skin side adhesive 5U and the center line of the non-skin side adhesive 5U are arranged so as to deviate from each other, and not only the center line but also the non-skin side adhesive 5U thick line and the thick line of the skin side adhesive 5T are flat. Without overlapping, the skin side adhesive 5T and the non-skin side adhesive 5U were respectively applied in stripes in plan view as a whole. The number of thick lines applied to the skin-side adhesive 5T was five, and the number of thick lines applied to the non-skin-side adhesive 5U was six. The width W1 of the thick line of each skin side adhesive 5T was 4 mm, and the width W2 of the thick line of each non-skin side adhesive 5U was also 4 mm. Further, the distance W3 between the thick lines of the adjacent skin side adhesives 5T and 5T was 16 mm, and the distance W4 between the thick lines of the non-skin side adhesives 5U and 5U was 16 mm. The application basis weight of the skin-side adhesive 5T was 30 g / m ² , and the application basis weight of the non-skin-side adhesive 5U was 30 g / m ² . The application area ratio of the skin-side adhesive 5T was 17%, and the application area ratio of the non-skin-side adhesive 5U was 20%.

[Comparative Example 1]
Regarding the skin-side adhesive and the non-skin-side adhesive for fixing the absorbent core and the covering material, an absorbent body of Comparative Example 1 was produced in the same manner as in Example 1 except that both were applied in a spiral shape. The skin-side adhesive and the non-skin-side adhesive applied in a spiral shape will be described in detail. The width of each skin-side adhesive is 120 mm, and the width of each non-skin-side adhesive is 120 mm. The application basis weight of the skin-side adhesive was 6 g / m ² , and the application basis weight of the non-skin-side adhesive was 6 g / m ² . And the application area rate of the skin side adhesive was 16%, and the application area rate of the non-skin side adhesive was 16%.

[Comparative Example 2]
Regarding the skin-side adhesive and non-skin-side adhesive for fixing the absorbent core and the covering material, the absorbent body of Comparative Example 2 is produced in the same manner as in Example 1 except that both are applied in a fine spiral shape. did. The skin-side adhesive and the non-skin-side adhesive applied in a spiral shape will be described in detail. The width of each skin-side adhesive is 120 mm, and the width of each non-skin-side adhesive is 120 mm. The application basis weight of the skin-side adhesive was 6 g / m ² , and the application basis weight of the non-skin-side adhesive was 6 g / m ² . And the application area ratio of the skin side adhesive was 23%, and the application area ratio of the non-skin side adhesive was 23%.

[Performance evaluation]
About the absorber of Examples 1-2 and Comparative Examples 1-2, it was evaluated about the difficulty of breaking of an absorber according to the following method. The evaluation environment was room temperature 20 ° C. and humidity 60% RH. The results are shown in Table 1 below.

[Evaluation of difficulty of absorber breakage]
The absorbent bodies obtained in Examples 1 and 2 and Comparative Examples 1 and 2 were placed on a horizontal table, and 100 g of artificial urine was injected and absorbed at the center of the absorbent body, and allowed to stand for 10 minutes. After standing still, the absorber is supported in a vertical state at a position 50 cm above the table, the support is released, and the absorber is dropped. This dropping operation of the absorbent body was repeated, and the number of times until the absorbent core and the covering material were fixed by the skin side adhesive or the fixing between the absorbent core and the covering material by the non-skin side adhesive was completely removed was measured. . The more drops, the more difficult it is to break the absorber. These results are shown in Table 1 below.

  As is clear from the results in Table 1, it was found that the absorbers of Examples 1 and 2 had a larger number of times the absorber was dropped than the absorbers of Comparative Examples 1 and 2, and the absorber was not easily broken. Therefore, the absorbent articles such as disposable diapers using the absorbent bodies of Examples 1 and 2 can be expected to improve the wearability of the wearer while improving the walking ability during wearing.

DESCRIPTION OF SYMBOLS 1 Disposable diaper 2 Top sheet 3 Back sheet 4 Absorbent body 41 Absorbent core 41T The skin facing surface of the absorbent core 41 41U The non-skin facing surface of the absorbent core 41 410 Layer of single pulp 42 Coating material 421 Skin side coating material 422 Non Skin side coating material 5 Adhesive 5T Skin side adhesive (thick line)
5T1 Center line extending in the vertical direction (Y direction) of the thick line of the skin side adhesive 5T 5U Non-skin side adhesive (thick line)
5U1 Non-skin side adhesive 5U center line TG extending in the vertical direction (Y direction) of thick line Three-dimensional gather 61 Three-dimensional gather forming elastic member 62 Gather forming sheet LG Leg gather 63 Leg gather forming elastic member 64 Waist part Elastic member 7 Fastening tape 8 Landing tape A Abdominal side, B Dorsal side, C Crotch CL Centerline extending in the vertical direction of the diaper

Claims (4)

An absorbent article comprising a top sheet disposed on the skin facing surface side, a back sheet disposed on the non-skin facing surface side, and a vertically long absorbent disposed between both the sheets,
The absorbent body has an absorbent core containing an absorbent polymer and a coating material that wraps the absorbent core, and the skin-side coating material on the skin-facing surface side of the coating material and the skin-facing surface of the absorbent core A non-skin-side covering material on the non-skin-facing surface side of the covering material and a non-skin-facing surface of the absorbent core are fixed via a non-skin-side adhesive. And
Each skin-side adhesive and each non-skin-side adhesive is a thick line that extends linearly in the longitudinal direction of the absorbent body, and is intermittently spaced apart in the lateral direction of the absorbent body and applied in stripes. Has been
When the absorbent body in the crotch part of the absorbent article is viewed in plan, the position of the center line of the thick line extending in the vertical direction of each skin-side adhesive and the thick line extending in the vertical direction of each non-skin-side adhesive the position of the center line, and laterally offset of the absorber, the number of the applied thick line of the skin-side adhesive Te coated heavy line less than the number Kuna' of the non-skin-side adhesive And
Each said skin side adhesive is an absorbent article whose width of the thick line is narrower than the width of the thick line of each said non-skin side adhesive . The spacing of the thick line with each other of the skin-side adhesive adjacent the transverse direction of the absorbent body, according to claim 1 wider than the spacing of the thick line with each other in the non-skin-side adhesive adjacent the transverse direction of the absorbent body Absorbent article. The absorbent article according to claim 1 or 2 , wherein an application area ratio of the skin-side adhesive is lower than an application area ratio of the non-skin-side adhesive. The absorbent article according to any one of claims 1 to 3 , wherein the absorbent article is a disposable diaper.

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