JP2016154654A - Underpants type absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an underpants type absorbent article capable of exhibiting a smart external appearance without giving discomfort to a wearer, and allowing persons with weakened grip strength due to aging to easily dress/undress it.SOLUTION: The underpants type absorbent article includes an inner wrapper body including an absorption member, and an outer wrapper body including a surface to which the inner wrapper body is fixed and defining a waist opening part. The outer wrapper body in which at least a part of the waist opening part periphery is formed of a stretchable sheet, where a stretchable film and a first nonwoven web are superposed, includes a fold-back part folded back to the front side, at a part around the waist opening. The fold-back part includes an elastic stretchable material disposed thereon.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pants-type absorbent article.

  The pants-type absorbent article is often provided with gathers at sites around the user's stomach, legs, etc. so that it is easy to attach and detach and has high fit to the wearer's body. For example, as shown in FIG. 6, these gathers bonded the elastic rubber thread rubber 110 to the nonwoven web in a stretched state over a wide range of the ventral region and the back region of the pant-type absorbent article 100. It can be formed by preparing a member and bonding it to the pant-type absorbent article 100. Thereby, the expansion / contraction characteristic of the pants-type absorbent article 100 is improved, the fit to the wearer's body is improved, and further, body fluids such as urine and blood may leak out of the pants-type absorbent article 100. Will be prevented.

  As a pants-type absorbent article, for example, Patent Document 1 includes an elastic member that forms gathers that are continuous over substantially the entire circumference of each peripheral edge at the peripheral edge of each of the waist opening and the pair of leg openings, At the peripheral edge of the waist opening and the peripheral edge of the leg opening, the welded joint between the side edge of the ventral side and the side edge of the back side has a length of at least 1 cm of the welded joint. An intermittent joint having a non-welded portion at a substantially central portion in the width direction is disclosed with the aim of good fit while maintaining a good wearing feeling and texture.

  However, such conventional absorbent articles give the wearer an uncomfortable feeling and uncomfortable feeling at the time of wearing due to their bulky and characteristic appearance. Also, for the purpose of further improving the fit at the time of wearing, often use gathers with increased number of thread rubber, and in that case, an adhesive for adhering to the nonwoven web to increase the thread rubber As a result, the texture was hard and the texture was poor. Moreover, in order to make it easy to attach and detach while maintaining the fit at the time of wearing, it is important that the pant-type absorbent article can be expanded and contracted more than the applicable waist size. In conventional pants-type absorbent articles, when the abdominal area is stretched by about 200%, the material is broken, and in order to increase the expansion ratio beyond this, more rubber thread is required. , Causing a worsening of the touch. Furthermore, the laminated nonwoven web not only stretches in the direction in which the rubber thread is disposed, but also slightly extends in a direction other than the direction in which the rubber thread is disposed. Sometimes, it was difficult to put on and take off. Furthermore, the conventional pants-type absorbent article has a problem that the waist is structurally slippery and difficult to grip with fingers during attachment / detachment, and therefore cannot be easily attached / detached for a person whose grip strength has decreased due to aging or the like. there were.

Japanese Patent Laid-Open No. 10-137287

  Accordingly, the object of the present invention has been made in view of such problems, and the object thereof is to provide a clean appearance that does not cause discomfort to the wearer, and to improve gripping force by aging or the like. It is an object of the present invention to provide a pant-type absorbent article that can be easily attached and detached even by a person with reduced aging.

(1) A pant-type absorbent article according to an embodiment of the present invention includes an interior body including an absorbent member, and an exterior body having a surface to which the interior body is fixed and a waist opening is defined. A pant-type absorbent article provided, wherein the exterior body is formed of an elastic sheet in which at least a part around a waist opening is laminated with an elastic film and a first nonwoven web, The body includes a folded portion that is folded to the surface side around the waist opening, and an elastic stretchable member is disposed in the folded portion.
(2) A pants-type absorbent article according to another embodiment of the present invention is the pants-type absorbent article according to (1) above, wherein the stretchable sheet further includes a second nonwoven web, The stretchable film is sandwiched between the first nonwoven web and the second nonwoven web.
(3) A pant-type absorbent article according to another embodiment of the present invention is the pant-type absorbent article according to the above (2), wherein the first nonwoven web is the second nonwoven web. An extending portion that extends beyond the end portion, the folded portion includes at least a part of the extending portion, and the end portion of the second nonwoven web is covered by the extending portion. Features.
(4) A pant-type absorbent article according to another embodiment of the present invention is the pant-type absorbent article according to any one of (1) to (3), wherein the folded portion includes a plurality of elastic sheets. A plurality of stretchable sheet layers including a first joining portion joined to each other.
(5) A pant-type absorbent article according to another embodiment of the present invention is the pant-type absorbent article according to (4) above, wherein the folded portion is arranged apart from the first joint portion. It is further characterized by further comprising a second joint portion.
(6) A pant-type absorbent article according to another embodiment of the present invention is the pant-type absorbent article described in (5) above, wherein the first joint is short of the pant-type absorbent article. The length in the direction is 2 mm or more and 10 mm or less, and the length in the longitudinal direction of the pants-type absorbent article is 10 mm or more and 30 mm or less, and the first joint portion and the second joint portion are provided. The separation distance is provided so as to be 20 mm or more and 100 mm or less.

  The pant-type absorbent article according to an embodiment of the present invention can reduce other members such as a nonwoven web and an adhesive for fixing an elastic member, thereby reducing costs and increasing manufacturing efficiency. Can do. The pants-type absorbent article of the present invention is provided with a folded portion on the inner side in the waist opening, so that a clean appearance that does not cause discomfort to the wearer can be obtained, and an elastic sheet The pants-type absorbent article can be easily lifted by placing a finger on the folded portion due to the contraction force of the exterior body including, and can be easily worn even by a person whose grip strength has decreased due to aging or the like.

It is the schematic which shows the underpants type absorbent article which concerns on embodiment of this invention. (A)-(d) is process drawing explaining the formation process of the folding | turning part 13 of the underpants type absorbent article 1 which concerns on embodiment of this invention using sectional drawing of the XX 'cross section in FIG. is there. It is the elements on larger scale in the rectangular area enclosed with the dashed-dotted line part of FIG. FIG. 4 is a partially enlarged view of a rectangular region surrounded by a one-dot chain line portion in FIG. 3. (A)-(c) is process drawing explaining the manufacturing process of the underpants type absorbent article 1 which concerns on embodiment of this invention. It is the schematic which shows the conventional pants type absorbent article.

  With reference to FIG. 1 thru | or FIG. 4, the underpants type absorbent article which concerns on embodiment of this invention, and its manufacturing method are demonstrated in detail. In the description of the present embodiment, the same numbers are assigned to the same elements throughout. FIG. 1 is a schematic view showing a pant-type absorbent article 1 according to the present embodiment, and FIGS. 2A to 2D are cross-sectional views taken along the line XX ′ in FIG. It is process drawing explaining the manufacturing method of the underpants type absorbent article 1 which concerns on embodiment of this, FIG. 3 is the elements on larger scale in the rectangular area enclosed with the dashed-dotted line part of FIG. 1, FIG. 3 is a partially enlarged view of a rectangular region surrounded by a one-dot chain line portion. FIG.

  In the description of the present specification, the longitudinal direction of the pant-type absorbent article 1 is a direction extending before and after the wearer when the pant-type absorbent article 1 is worn, and the short direction of the pant-type absorbent article 1 is Means a direction transverse or perpendicular to the longitudinal direction. Further, in the description of the present specification, the body fluid refers to a liquid discharged from the body such as urine, blood, and water in loose stool. Furthermore, in the description of the present specification, the inside of the pant-type absorbent article 1 is the skin contact surface side, which is the A side in FIGS. The outside refers to the non-skin contact surface side, and refers to the B side in FIGS. And when the pants-type absorbent article 1 is worn, it means the pants-type absorbent article 1 is being worn. The pants-type absorbent article 1 of the present embodiment can be used as, for example, disposable diapers, pediatric training pants, incontinence articles, and female sanitary articles. Further, the non-woven web means a sheet-like one in which fibers are entangled without being woven.

  First, an embodiment of a pants-type absorbent article 1 according to the present invention will be described with reference to FIGS. As shown in FIGS. 1 to 4, the pant-type absorbent article 1 includes an exterior body 10 in which a waist opening W is defined, and an interior body 20 fixed to the surface of the exterior body 10 on the skin contact surface side. Is provided. And in the underpants type absorbent article 1, the abdominal region 31 located on the wearer's abdomen, the dorsal region 32 located on the wearer's back, the abdomen region 31 and the dorsal region 32 are coupled to each other. A crotch region 33 is defined.

(Interior body)
The interior body 20 of the present embodiment includes at least an absorbing member and is disposed to absorb body fluid. The interior body 20 includes a liquid-permeable top sheet disposed on the skin contact surface side, a liquid-impermeable back sheet on the non-skin contact surface side disposed to face the top sheet, and a top sheet. And an absorbent member disposed between the back sheet. Thereby, the absorption member has a structure sandwiched between the top sheet and the back sheet. The interior body 20 is disposed at least on the crotch region 33 and inside the exterior body 10 and is fixed to the surface of the exterior body 10 by an adhesive such as hot melt, heat fusion, ultrasonic bonding, or the like. ing. The interior body 20 may be provided from the ventral region 31 to the back region 32.

The base material of the top sheet of this embodiment is only required to have liquid permeability so that body fluid moves to the absorbent member. For example, a nonwoven web such as a thermal bond nonwoven web, a thermal bond / spun bond, etc. It is formed from a material such as a laminated composite non-woven web, an open film such as an open polyethylene film, a foamed film such as polyethylene foam or urethane foam, or a composite sheet obtained by laminating these. The top sheet is preferably embossed or perforated on the surface in order to improve liquid permeability. The processing method can perform a well-known method without a restriction | limiting. In order to reduce irritation to the skin, the top sheet preferably contains a lotion, an antioxidant, an anti-inflammatory component, a pH adjuster, an antibacterial agent, a moisturizing agent and the like. Furthermore, from the viewpoint of strength and workability, the basis weight of the top sheet is preferably 14 g / m ² or more and 40 g / m ² or less. Although there is no restriction | limiting in particular as a shape of a top sheet, In order to guide body fluids, such as urine, to an absorption member, what is necessary is just a shape which covers an absorption member.

  In addition, it is preferable to provide the three-dimensional gather which prevents the leakage of a bodily fluid along the both-sides edge part of the longitudinal direction of the interior body 20 at the skin contact surface side of a top sheet. The outer end portion of the three-dimensional gather in the short direction of the interior body 20 is fixed to the back sheet, and the inner end portion of the three-dimensional gather in the short direction is fixed to the top sheet in the longitudinal direction, and between the front and rear portions. The central part is a free end that is not fixed to the top sheet, and is formed of a three-dimensional elastic member such as rubber thread and a sheet of non-woven web along the longitudinal direction of the interior body. However, it can be extended and contracted in accordance with the user's body shape.

  The base material of the backsheet of this embodiment may be any material that has liquid impermeability so that the body fluid retained by the absorbent member does not leak, such as a nonwoven web, a resin film, or a composite layered with these layers. It is formed from a material such as a sheet. The production method of the nonwoven web is not particularly limited. For example, a spunbond or meltblown nonwoven web, or a spunbond / meltblown, spunbond / meltblown / spunbond laminated nonwoven web, and these Composite materials are contemplated. Examples of the resin film include polyester, polyvinyl alcohol, polyethylene, polypropylene, and a composite film of polyethylene and polypropylene. Moreover, in order to prevent the stuffiness at the time of mounting | wearing, it is preferable that a back seat | sheet has moisture permeability. In order to provide moisture permeability, for example, a filler is blended in the resin film of the base material, and embossing for perforation is performed on the back sheet.

  The base material of the absorbent member of the present embodiment is not particularly limited as long as it is generally used for absorbent articles such as sanitary napkins, diapers, and urine pads. For example, fluff pulp, super absorbent resin (Super Absorbent) Polymer; hereinafter referred to as “SAP”), formed from a material such as a hydrophilic sheet. Examples of fluff pulp include those obtained by defibrating non-wood pulp such as wood pulp, synthetic fiber, and polymer fiber into a cotton shape. Examples of the superabsorbent resin include sodium polyacrylate, and examples of the hydrophilic sheet include tissue, absorbent paper, and hydrophilic nonwoven web.

  The absorbent member is configured as a single layer or a multilayer sheet using the above-described base material. Among these, those formed by mixing a hydrophilic fiber matrix of a fluff pulp web, such as a wood pulp fluff, with SAP particles are preferable. Further, in order to prevent leakage of SAP particles and stabilize the shape of the absorbing member, it is preferable to wrap the absorbing member in a hydrophilic sheet (not shown) such as tissue. Furthermore, it is preferable to emboss the surface of the absorbent member because it controls the diffusion of body fluid and easily deforms the absorbent member according to the body shape of the user.

(Exterior body)
The pants-type absorbent article 1 is positioned at the side end 11 a located at the side end of the ventral region 31 and the side end of the dorsal region 32 by overlapping the portions located in the ventral region 31 and the dorsal region 32. By fixing the side end portions 11b to each other, the exterior body 10 formed in a pants shape is provided. Thereby, the waist opening W is defined in the exterior body 10. The portions located in the ventral region 31 and the dorsal region 32 are stretchable so that at least a part around the waist opening W can be stretched by laminating at least one nonwoven web 14 and the stretchable film 15. It consists of a sheet 12. The stretchable sheet 12 may be a laminate of two or more nonwoven webs 14 and stretchable films 15. The nonwoven web 14 and the stretchable film 15 are integrated by heat fusion or ultrasonic bonding. A good fit to the pant-type absorbent article 1 by being located in at least the ventral region 31 and the dorsal region 32 of the exterior body 10 and comprising at least a part around the waist opening W with the stretchable sheet 12. Can give sex.

  As shown in FIG. 2, the pant-type absorbent article 1 of the present embodiment is folded around the waist opening W to the inside of the pant-type absorbent article 1, that is, the surface side to which the interior body 20 is fixed. A folded portion 13 is provided. An elastic elastic member 19 is disposed and fixed to the folded portion 13. Thereby, it becomes easy to put a finger on the folding | returning part 13 with the contraction force by the exterior body 10 containing the elastic sheet 12, and even the person whose grip strength fell by aging etc. easily attaches or detaches the pants-type absorbent article 1. be able to. In addition, the pant-type absorbent article 1 of the present embodiment makes it difficult to visually recognize the elastic stretchable member 19 from the outside of the pant-type absorbent article 1 and can give the wearer an impression close to cloth underwear in appearance. The discomfort and resistance to the pants-type absorbent article 1 of the wearer can be reduced.

  Preferably, as shown in FIG. 2 (c) or (d), the stretchable sheet 12 includes at least a first nonwoven web 14 and a second nonwoven web 16, a first nonwoven web 14 and a second nonwoven web 14. The elastic sheet 12 is obtained by combining and integrating the elastic film 15 sandwiched between the non-woven web 16. The stretchable sheet 12 having such a laminated structure of nonwoven web 14 / stretchable film 15 / nonwoven web 16 is a hot melt type in which each layer is combined and integrated by thermal fusion or ultrasonic bonding. It is preferable that they are combined and integrated without using such an adhesive. Thereby, the nonwoven webs 14 and 16 cover the stretchable film 15, and by reducing the thread rubber and the adhesive, it is possible to obtain a pant-type absorbent article having a good texture. Note that the entire surface of the stretchable film 15 may be covered with the nonwoven webs 14 and 16. As shown in FIG. 2C, the folded portion 13 is folded in a single layer, and the elastic elastic member 19 is sandwiched between the single folded portion 13a and the portion of the exterior body 10 other than the single folded portion 13a. As shown in FIG. 2 (d), the elastic elastic member 19 is folded back twice, and is formed by the double folded portion 13b and the portion of the exterior body 10 other than the double folded portion 13b. May be sandwiched.

  The side end portion 11 of the pant-type absorbent article 1 has a side end portion 11a located at the side end of the ventral region 31 and a side end portion 11b located at the side end of the dorsal region 32 by embossing or the like. It is fixed to. The side edge part 11 may be formed so that it can be broken so that the pants-type absorbent article 1 can be easily removed from the wearer.

  Next, an example of a method for producing the pant-type absorbent article 1 of the present embodiment will be described with reference to FIGS. First, as shown to Fig.2 (a), the 1st nonwoven web which has the extension part 14a extended beyond the upper edge edge part of at least any one of the 2nd nonwoven web 16 and the elastic film 15 14, including the stretchable sheet 12. The thing containing this elastic sheet 12 has the elastic sheet 12 cut into the expanded pants shape, and the interior body 20 fixed to the skin contact surface side of the elastic sheet 12, for example. Alternatively, the one including the stretchable sheet 12 is positioned at the side end of the ventral region 31 by overlapping the portions corresponding to the ventral region 31 and the dorsal region 32 of the stretchable sheet 12 cut into a developed pant shape. The side end portion 11a and the 11b located at the side end of the back region 32 may be fixed to each other.

  Next, as shown in FIG. 2 (b), an elastic elastic member 19 such as thread rubber is fixed to the surface of the second nonwoven web 16 of the elastic sheet 12. The elastic elastic member 19 can be fixed to the surface of the second nonwoven web 16 by heat welding, ultrasonic bonding, bonding using an adhesive, or the like. The elastic elastic member 19 is disposed on the entire circumference or a part of the portion around the waist of the exterior body 10 by being fixed to the elastic sheet 12 in an extended state.

  And as shown in FIG.2 (c), the extending part 14a of the 1st nonwoven web 14 is set to the inner side of the underpants type absorbent article 1 so that the elastic elastic member 19 may be covered, ie, the exterior body 10 Is folded to the surface side to which the interior body 20 is fixed, thereby forming a single folded portion 13 a as the folded portion 13. The elastic elastic member 19 is sandwiched and fixed between the extending portion 14 a and the second nonwoven web 16. Thereby, the folding | returning part 13 containing at least one part of the extension part 14a is formed so that the upper edge edge part of a 2nd nonwoven web may be covered with the extension part 14a. By including such a process, the pants-type absorbent article 1 is formed.

  Further, as shown in FIG. 2 (d), the end portion of the outer package 10 is folded back in the direction of the inside of the pant-type absorbent article 1 so as to cover the single folded portion 13 a, and double folded as the folded portion 13. The pants-type absorbent article 1 may be formed by forming the part 13b. This folding | returning part 13 can also be made into arbitrary multiple folding | turning parts, such as triple and quadruple.

  In the said manufacturing method, although demonstrated using the 1st nonwoven web 14 which has the extension part 14a, you may use the 1st nonwoven web 14 which does not have the extension part 14a, In this case In this case, it is possible to realize the single folded portion 13a by folding the upper edge portion of the first nonwoven web 14 instead of the extending portion 14a.

  Thereby, since the folding | returning part 13 is provided in the inner side in the waist opening W in the underpants type absorbent article 1 of this embodiment, the folding | returning part 13 by the contraction force by the exterior body 10 containing the elastic sheet 12 is provided. It is easy to pull up the pant-type absorbent article 1 by putting a finger on it, and even a person whose gripping power has decreased due to aging or the like can be easily worn. And since the double support of the elastic sheet 12 and the elastic elastic member 19 is obtained in the folding | returning part 13, the underpants type absorbent article 1 of this embodiment improves the fit around a waist, and others In this area, the elastic stretch member 19 and the adhesive for fixing the elastic stretch member 19 are not provided, so that the touch can be improved.

  Further, the folded portion 13 is provided by arranging an arrangement region in which the elastic stretchable member 19 is provided in the upper portion 13c of the folded portion 13 and a non-placed region in which the elastic stretchable member 19 is not provided in the lower portion 13d of the folded portion 13. The lower edge 18 may be flared. Thereby, the pants-type absorbent article 1 can be easily lifted by placing a finger on the folded portion 13.

  FIG. 3 is a partially enlarged view of a rectangular region surrounded by a one-dot chain line in FIG. As shown in this figure, the pant-type absorbent article 1 is a joint in which a plurality of stretchable sheets 12 (a plurality of stretchable sheet layers) constituting the folded portion 13 are joined and integrated in the formation region of the folded portion 13. It is preferable to have the part 17. The joint portion 17 can be formed by forming the folded portion 13 and then forming the joint portion formation region by any one of heat welding, ultrasonic bonding and adhesive bonding, or a combination thereof. In order to improve the touch of the article 1, it is preferable to employ a bonding method using thermal welding or ultrasonic bonding without using an adhesive. As shown in FIG. 3, the joint portion 17 may be provided so that the outer shape is any shape such as an elongated elliptical shape, a circular shape, and an elongated rectangular shape.

  FIG. 4 is an enlarged view in which the one-dot chain line portion of the pant-type absorbent article 1 of the present embodiment shown in FIG. 3 is further enlarged. As shown in FIG. 4, the length L1 of the joint portion 17 in the longitudinal direction of the absorbent article 1 is 10 mm or more and 30 mm or less, and the length L2 of the joint portion 17 in the short direction of the absorbent article 1 is 2 mm or more. It is preferable to be provided to be 10 mm or less.

  The adjacent joints 17 are provided intermittently with a distance D therebetween. The distance D between the adjacent joints 17, the first joints 17 a, and the second joints 17 b is preferably 20 mm or greater and 100 mm or less. Note that the lengths L1 and L2 of the joint portion 17 and the separation distance D between the joint portions 17 are the maximum length or the maximum interval, respectively. The distance D between the first joint 17a and the second joint 17b refers to the distance from the center of the first joint 17a to the center of the second joint 17b.

  The exterior body 10 located in the crotch region 33 may be composed of the stretchable sheet 12 similarly to the portions located in the ventral region 31 and the dorsal region 32, or a non-stretchable sheet such as a nonwoven web is used. You may comprise, and may comprise the elastic sheet 12 similarly to the part located in the ventral | abdominal area | region 31 and the back | dorsal area | region 32.

  The non-woven web 14 constituting the stretchable sheet 12 of the present embodiment is not particularly limited, and for example, spunbond, meltblown nonwoven web, or spunbond / meltblown, spunbond / meltblown / spunbond are laminated. Exemplified composite nonwoven webs and composite materials thereof are exemplified. The stretchable film 15 is not particularly limited as long as it has stretchability, and examples thereof include films formed from polyester elastomers, polyolefin elastomers, polyurethane resins, polyamide resins, and the like. Among these, a polyurethane resin film is preferable from the viewpoint of cost and stretchability.

  The elastic elastic member 19 is configured to hold the pant-type absorbent article 1 including the exterior body 10 by pulling it against the wearer's waist by fixing the elastic elastic member 19 to the elastic sheet 12 in a stretched state. It has been done. The elastic elastic member 19 may have any shape such as a thread shape, a strip shape, a waist belt shape, etc., but has an elongated shape and is elongated along the short direction rather than the longitudinal direction of the pant-type absorbent article. It controls the expansion and contraction characteristics of the mold absorbent article. As the elastic stretchable member 19, for example, any elastic shrinkable material such as one or a plurality of thread rubbers, a waist belt in which the thread rubbers are fixed to a nonwoven web, an elastomer film, an elastic foam material, an elastomer cloth, or the like can be used. .

The stretchable sheet 12 has an air permeability measured based on JIS L 1096-A (Fragile method): 1990 of 20 cm ³ / cm ² · sec or more in a non-stretched state. If the air permeability is less than 20 cm ³ / cm ² · sec, it becomes easy to get stuffy when worn. The air permeability can be freely determined by the thickness of the fibers and yarns of the nonwoven web 14 constituting the elastic sheet 12, the weaving density, the weight per unit area, the opening area ratio of the opening provided in the elastic sheet 12, and the like. Can be changed.

The stretchable sheet 12 has an air permeability measured based on JIS L 1096-A (Fragile method): 1990 of 50 cm ³ / cm ² · sec or more when stretched 150% in the stretch direction. Here, 150% stretched in the stretching direction means that the length L2 when the stretchable sheet 12 is stretched in a specific direction (stretching direction) with respect to the natural length L1 of the stretchable sheet 12 in the non-stretched state. The elongation rate is calculated by the following equation: elongation rate = L2 / L1 × 100 [%]. That is, for example, when the stretchable sheet 12 having a natural length of 10 cm in a non-stretched state is stretched in the stretching direction to 15 cm, it is stretched by 150% (= 15/10 × 100) in the stretching direction. When the air permeability is less than 50 cm ³ / cm ² · sec, the portion used in the stretched state, for example, the portion around the buttocks is easily stuffy when worn.

  The stretch sheet 12 preferably has stretch properties in both the longitudinal direction and the short direction of the pants-type absorbent article 1. And as for the elastic sheet 12, it is preferable that the stretchability of the transversal direction of the pants type absorbent article 1 is larger than the stretchability of the pants type absorbent article 1 in the longitudinal direction.

  The pant-type absorbent article 1 may be provided with a pair of left and right leg gathers from the ventral region 31 through the crotch region 33 to the dorsal region 32. The leg gather is formed of, for example, an elastic member such as rubber thread and a sheet such as a nonwoven web. By providing the leg gathers, the fit at the part around the crotch is improved.

  A plurality of openings may be formed in the stretchable film 15. The plurality of openings are staggered in plan view in order to improve the air permeability in the outer package 10 of the pant-type absorbent article 1 and to alleviate the decrease in durability due to the opening of the stretchable film 15. It may be arranged. Moreover, the shape of these some opening part is not specifically limited, For example, a rectangle, an ellipse, a rhombus etc. may be sufficient.

  Next, with reference to FIG. 5, the formation method of the elastic sheet 12 used for the underpants type absorbent article 1 which concerns on embodiment of this invention is demonstrated. Here, a method for forming the continuous body of the stretchable sheet 12 while conveying it in the longitudinal direction will be described. First, as shown in FIG. 5A, as a first step, a continuous body that becomes the stretchable film 15 is fed from the rotating roller 51, and a predetermined tension is applied to the continuous body that becomes the stretchable film 15. Stretch to. The predetermined tension refers to a state in which the stretchable film 15 is stretched by 200% or more, more preferably 250 ± 30%. In the second step, the continuum to be the nonwoven web 14 supplied from the rotating roller 52a and the continuum to be the nonwoven web 16 supplied from the rotating roller 52b become the stretchable film 15 in an expanded state. Laminate above and below the continuum. Next, in the third step, a seal line substantially continuous in the longitudinal direction perpendicular to the stretching direction is formed in the stretching direction in the continuous body that is the laminated stretchable film 15, nonwoven web 14, and nonwoven web 16. On the other hand, it is formed by heat-sealing or ultrasonic bonding over the entire region at intervals of 0.5 mm or more and 2.0 mm or less, and a continuous body consisting of the stretchable film 15, the nonwoven web 14, and the nonwoven web 16 is fixed. Thereby, the elastic sheet 12 is formed. Specifically, as shown in FIG. 5B, the laminated stretchable film 15, the nonwoven web 14, and the nonwoven web 16 are narrowed by the joining roller 53 and the other joining roller 54, and the joining roller 53 A contact line between the tip end portion 55 and the side surface 56 of the other joining roller 54 is heat-sealed or ultrasonically bonded to form a seal line. In this way, the seal lines are formed at a predetermined interval, and the nonwoven web 14, the stretchable film 15, and the nonwoven web 16 are integrated, so that the wrinkles on the surface of the exterior body 10 are alleviated and the skin feels smooth. It can be.

  The elastic sheet 12 has an arithmetic average roughness Ra of 600 μm or more and 1200 μm or less, a maximum cross-sectional height Rt of a roughness curve of 60 μm or more and 250 μm or less, and 600 μm at least on the non-skin contact surface side of the ventral region 31. As mentioned above, it is preferable to have the average length RSm of the roughness curve element of 8500 μm or less. The stretchable sheet 12 has an arithmetic average roughness Ra of 400 μm or more and 1000 μm or less and a maximum section height Rt of a roughness curve of 50 μm or more and 200 μm or less when stretched 150% in the stretch direction. Is preferred. Arithmetic average roughness Ra is based on JIS B 0601 (2001), and by making it into the above range, the surface does not become too flat, the surface is smooth, and the design is good. Moreover, the maximum cross-sectional height Rt of the roughness curve is based on JIS B 0601 (2001), and by setting the above range, the surface has an appropriate frictional force. Furthermore, the average length RSm of the roughness curve element is based on JIS B 0601 (2001), and by making it within the above range, a high-quality touch can be obtained. Therefore, the surface of the pants-type absorbent article 1 can have an appearance closer to that of underwear. When the pants-type absorbent article 1 is detached, the arithmetic average roughness Ra and the maximum cross-sectional height Rt of the roughness curve are set within the above ranges when stretched 150% in the stretching direction. Goodness can be given. The arithmetic average roughness Ra, the maximum cross-sectional height Rt of the roughness curve, and the average length RSm of the roughness curve element are, for example, a one-shot 3D measurement macroscope (trade name: VR-3100) manufactured by KEYENCE Inc. Can be measured.

  The stretchable sheet 12 has an elongation load of 0.8 N / 50 mm or more and 2.0 N / 50 mm or less when stretched 120% in the stretch direction, and 2.0 N / when stretched 150% in the stretch direction. It is preferable to have an extension load of 50 mm to 3.5 N / 50 mm. In addition, since the elongation rate changes depending on the wearer's body shape, 120% and 150% elongation loads were defined. By doing in this way, a difference in fit does not occur depending on the body shape. The stretchable sheet 12 preferably has an elongation of 30% or less when a load of 3.0 N / 50 mm is applied in a direction intersecting the stretchable direction. By doing in this way, since it does not expand | extend in directions other than an arrangement | positioning direction, it becomes easy to attach or detach the pants type absorbent article 1. In addition, the stretchable sheet 12 has a stretch rate in the stretch direction of 200% or more and 270% or less. For this reason, since expansion | swelling of 200% or more was attained compared with the past, the pants type absorbent article 1 which is easy to wear and can take off easily for a wearer can be provided. Here, the elongation ratio in the expansion / contraction direction is the ratio of the extended length to the natural length in the non-expandable state, as in the case of 120% expansion in the expansion / contraction direction. The extension load can be measured using, for example, an autograph manufactured by Shimadzu Corporation.

  The stretchable sheet 12 preferably has a breaking elongation of 210% or more and 280% or less in the stretching direction. Here, the elongation at break is the expansion and contraction in a specific direction (stretching direction) when the original length of the stretchable sheet 12 in the non-stretchable natural length is L1 and the length when stretched is L2. The elongation rate (L2 / L1 × 100) when the sheet 12 is stretched and broken. By having the breaking elongation in this range, there is an effect that it becomes difficult to be stretched or torn even if the pants are widened greatly when attaching and detaching. The breaking elongation can be measured using, for example, an autograph manufactured by Shimadzu Corporation.

  As mentioned above, although this invention was demonstrated using embodiment, it cannot be overemphasized that the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be made to the above embodiment. Further, it is apparent from the description of the scope of claims that embodiments with such changes or improvements can also be included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Underpants type absorbent article 10 Exterior body 11 Side edge part 12 Elastic sheet 13 Folding part 13a Single folding part 13b Double folding part 14 1st nonwoven web 14a Extension part 15 Elastic film 16 2nd nonwoven web DESCRIPTION OF SYMBOLS 18 Lower edge part of folding | turning part 19 Elastic elastic member 20 Interior body 31 Abdomen side area | region 32 Back side area | region 33 Crotch area | region A The inside of a pants type absorbent article B The outer side of a pants type absorbent article

Claims (6)

A pants-type absorbent article comprising: an interior body including an absorbent member; and an exterior body having a surface to which the interior body is fixed and having a waist opening defined therein,
The exterior body is formed of an elastic sheet in which at least a part around the waist opening is laminated with an elastic film and a first nonwoven web,
The pouch-type absorbent article, wherein the exterior body includes a folded portion that is folded back on the surface side around the waist opening, and an elastic elastic member is disposed in the folded portion.   The stretchable sheet further includes a second nonwoven web, and the stretchable film is sandwiched between the first nonwoven web and the second nonwoven web. Item 10. The pant-type absorbent article according to Item 1. The first nonwoven web includes an extension that extends beyond an end of the second nonwoven web;
The pants according to claim 2, wherein the folded portion includes at least a part of the extended portion, and the end portion of the second nonwoven web is covered with the extended portion. Mold absorbent article.   4. The device according to claim 1, wherein the folded portion includes a plurality of stretchable sheet layers and includes a first joint portion in which the plurality of stretchable sheet layers are joined to each other. Pants-type absorbent article.   The pants-type absorbent article according to claim 4, wherein the folded portion further includes a second joint portion that is spaced apart from the first joint portion. The first joint portion is provided so that the length of the pants-type absorbent article in the short direction is 2 mm or more and 10 mm or less, and the length of the pants-type absorbent article in the longitudinal direction is 10 mm or more and 30 mm or less. And
The pants-type absorbent article according to claim 5, wherein a distance between the first joint and the second joint is 20 mm or more and 100 mm or less.

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