JP6668032B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article mainly used for sanitary napkins, vaginal sheets, incontinence pads, toiletries, and the like, and more particularly, to an absorbent article having a back sheet on which an elastic portion and a non-elastic portion are formed. Related to goods.

  Conventionally, as absorbent articles such as panty liners, sanitary napkins, incontinence pads, etc., liquid-permeable backing sheets such as polyethylene sheets or polyethylene sheet-laminated nonwoven fabrics, and liquid-permeable topsheets such as nonwoven fabrics or liquid-permeable plastic sheets And an absorbent body made of cotton-like pulp or the like is interposed therebetween.

  Numerous improvements have been made to this type of absorbent article, and there are various types of articles having enhanced fit and fit by imparting elasticity. For example, by giving the flap part elasticity in the longitudinal direction and the width direction, it is possible to obtain the effect of improving the fitability following the movement of the legs, improving the fitability of the wing part, etc. It has been known.

  Further, in Patent Document 1 described below, the longitudinal side edge member is formed of a web material having an extensible network having elastic properties so that the longitudinal side edge member is a side edge of a wearer's panty. Are naturally surrounded, and a substitute for the conventional side flap is formed on the side edge. Patent Literature 2 below discloses an absorbent article in which a pair of flaps provided continuously from both side edges in the longitudinal direction of the main body portion in the width direction to the outside are stretchable flaps formed using a laminated sheet. .

Japanese Patent Publication No. 9-502634 JP-A-10-174699

  However, the absorbent article having elasticity as described above, when the entire absorbent article is elastic, increases the manufacturing cost, and is easily detached from the underwear due to stress due to expansion and contraction. There was a problem. Further, in the case of a part having elasticity, the manufacturing cost can be reduced, but the expansion and contraction is limited, which may cause wrinkles and twists. Furthermore, few have elasticity in a direction appropriate for the movement of the wearer's body, such as when walking or standing and sitting.

  On the other hand, in the structure described in Patent Document 1, since the stretchable web material is provided over the entire length, wrinkles and twists are likely to be generated at the time of mounting, and the feeling of mounting may be deteriorated. Further, in the absorbent article described in Patent Document 2, in the case of a flap portion that can be extended in the width direction, the effect of following the movement of the wearer to fit is low, and the ability to follow the movement of the wearer is low. There was a problem that the fit was reduced.

  Therefore, a main object of the present invention is to provide an absorbent article which has a good fit following a movement of a wearer, has less wrinkles and twists, and has an excellent wearing feeling.

In order to solve the above-described problems, the present invention according to claim 1, in an absorbent article in which an absorber is interposed between a liquid-permeable top sheet and a back sheet,
The back sheet is formed of a stretchable sheet that can be stretched in the longitudinal direction of the absorbent article, and at least a body portion where the absorber intervenes, a stretchable portion where the stretchable force of the stretchable sheet acts, with lost stretching force of the elastic sheet by applying a non-stretchable reduction processed into elastic sheet and the non-contracted parts are alternately arranged in the longitudinal direction of the absorbent article, the absorbent on both sides of the body portion A flap portion where a body is not provided is provided, at least in the front region and the rear region of the flap portion, the stretchable portion and the non-stretchable portion are alternately arranged in the longitudinal direction of the absorbent article,
The elastic part and the non-elastic part of the main body part and the elastic part and the non-elastic part of the flap part are arranged so that the elastic parts and the non-elastic parts do not adjoin each other in the width direction of the absorbent article. absorbent article characterized in that that there is provided.

  According to the first aspect of the present invention, the stretchable portions and the non-stretchable portions are alternately arranged in the longitudinal direction of the absorbent article. Since it exerts power, it becomes easy to follow the movement of the wearer's body at the time of walking, standing and sitting, and the like, and the fit is enhanced. In addition, since wrinkles and twists generated by the stretchable portions are absorbed by the non-stretchable portions, an absorbent article with less wrinkles and twists and excellent in a feeling of wearing can be obtained.

Further, in addition to the main body portion, at least in the front region and the rear region of the flap portion, respectively, by alternately arranging the stretchable portion and the non-stretchable portion in the longitudinal direction of the absorbent article, this flap portion Following the movement around the legs, it becomes easier to fit, and wrinkles and twists are less likely to occur, so that the feeling of wearing is further improved.

And the elastic part and the non-elastic part of the main body part and the elastic part and the non-elastic part of the flap part are such that the elastic parts and the non-elastic parts do not adjoin each other in the width direction of the absorbent article. The arrangement makes it difficult for the expansion and contraction forces acting on the main body portion and the flap portion to interfere with each other, and facilitates fitting of each region to the body by the expansion and contraction force acting on each region.

As the present invention according to claim 2 , on both sides of the main body portion, wing-shaped flaps projecting to the side, which are fixed so as to wrap the crotch portion of the underwear at the time of mounting, are formed,
The absorbent article of claim 1 Symbol mounting the non-contracted parts in the flap portions inward of the virtual line is not provided for connecting the proximal end portion of the front and rear of the wing-shaped flaps are provided.

According to the second aspect of the present invention, since the non-stretchable portion is not provided in the flap portion inside the imaginary line connecting the front and rear base portions of the wing-shaped flap, the wing-shaped flap is attached to the underwear crotch portion at the time of mounting. , The fit around the legs when fixed by being involved is improved.

According to a third aspect of the present invention, in the main body portion, the stretchable portion and the non-stretchable portion have a staggered arrangement region alternately arranged in the longitudinal direction and the width direction of the absorbent article. 2. The absorbent article according to any one of the above items.

According to the third aspect of the invention, by providing the main body portion with the staggered arrangement region of the elastic portion and the non-elastic portion, the body can follow the movement of the body more finely, and the generation of wrinkles and twists is further suppressed. Will be able to

According to a fourth aspect of the present invention, the adhesive layer for preventing slippage formed on the underwear contact surface side of the back sheet is provided on the non-stretchable portion, and is not provided on the stretchable portion. The absorbent article according to any one of Items 1 to 3, is provided.

According to the fourth aspect of the present invention, since the slip-preventive pressure-sensitive adhesive layer is provided only on the non-stretchable portion, the stress applied to the portion fixed to the undergarment is reduced, the peeling-off is difficult, and the slip-resistant adhesive layer is provided on the stretchable portion. Therefore, the elasticity of the elastic part is more flexibly exhibited.

As the present invention according to claim 5 , as the present invention according to any one of claims 1 to 4, a weakly stretchable portion in which the stretchable force of the stretchable sheet is weakened is provided at a boundary between the stretchable portion and the non-stretchable portion. An article is provided.

According to the fifth aspect of the present invention, by providing the weakly stretchable portion at the boundary between the stretchable portion and the non-stretchable portion, it becomes possible to prevent wrinkles and twists generated at these borders due to the difference in elongation.

According to the sixth aspect of the present invention, the stretchable sheet has an elongation of 20% to 40% according to the B method (constant load method of the woven fabric) of the stretchability of the stretchable woven fabric and the knitted fabric of JIS L1096. An absorbent article according to any one of Items 1 to 5, is provided.

According to the sixth aspect of the present invention, by setting the stretch rate of the stretchable sheet to 20% to 40%, the stretchable sheet can be formed with a stretch rate substantially equal to that of general underwear. It expands and contracts to improve the fit and further reduce the deviation.

  As described in detail above, according to the present invention, it is possible to provide an absorbent article that is rich in fit and follows the movement of a wearer, has less wrinkles and twists, and is excellent in a feeling of wearing.

FIG. 2 is a partially broken back view of the sanitary napkin 1 according to the present invention. FIG. 2 is a view taken along line II-II in FIG. 1. It is a back view of the sanitary napkin 1 explaining each area. It is a back view (the 1) which shows the modification of sanitary napkin 1. It is a back view (the 2) which shows the modification of sanitary napkin 1. It is a back view (the 3) which shows the modification of sanitary napkin 1. It is a back view (the 4) which shows the modification of sanitary napkin 1. It is a side view which shows the manufacturing apparatus of the liquid impervious back sheet 2. It is a side view which shows the modification of an embossing roll. It is a back view of sanitary napkin 1 concerning other forms.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Basic structure of sanitary napkin 1]
The sanitary napkin 1 includes a liquid-impervious back sheet 2 made of a polyethylene sheet or the like, a liquid-permeable top sheet 3 that allows menstrual blood, vaginal discharge, and the like (hereinafter, collectively referred to as body fluid) to pass through quickly. An absorbent body 4 made of cotton-like pulp or synthetic pulp or the like interposed between the two sheets 2 and 3, and around the absorbent body 4, the liquid-impermeable back sheet 2 and the liquid-permeable The top sheet 3 is joined by an adhesive such as hot melt or joining means such as heat sealing, and the presence of the absorber 4 on the outer periphery due to the laminated sheet portion of the liquid-impermeable back sheet 2 and the liquid-permeable top sheet 3 The outer peripheral flap portion is formed, and wing-shaped flaps W, W protruding laterally are formed. If necessary, a wrapping sheet made of crepe paper, nonwoven fabric, or the like surrounding the absorber 4 may be provided to maintain the shape of the absorber 4 and improve the diffusivity.

Hereinafter, the structure of the sanitary napkin 1 will be described in more detail.
As the liquid-impervious back sheet 2, it is preferable to use a polylaminate nonwoven fabric in which a plastic film and a nonwoven fabric are laminated. In the sanitary napkin 1, a stretchable sheet that can expand and contract in the longitudinal direction of the sanitary napkin 1 is used as the liquid-impermeable backing sheet 2. The impermeable back sheet 2 will be described in more detail later.

  Next, as the liquid permeable surface sheet 3, a perforated or non-porous nonwoven fabric or a porous plastic sheet is preferably used. The material fibers constituting the nonwoven fabric can be synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, polyamides, etc., recycled fibers such as rayon and cupra, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a method, a spun bond method, a thermal bond method, a melt blown method, and a needle punch method can be used. Among these processing methods, the spunlace method is excellent in that it is rich in flexibility and drapability, and the thermal bond method is excellent in that it is bulky and has high compression recovery. When a large number of through-holes are formed in the liquid-permeable topsheet 3, the body fluid is quickly absorbed, and the dry touch property is excellent. It is desirable to apply various embosses from the upper surface side of the liquid-permeable topsheet 3 to promote stagnation of bodily fluids and increase absorption efficiency to prevent lateral leakage. The fibers of the nonwoven fabric may be either long fibers or short fibers, but preferably short fibers are used to give the texture of the toweling. Further, in order to facilitate the embossing treatment, it is preferable to use an olefin-based fiber such as polyethylene or polypropylene having a relatively low melting point. Further, composite fibers such as a core-sheath fiber, a side-by-side fiber, a split fiber, and the like, in which a fiber having a high melting point is used as a core and a fiber having a low melting point is used as a sheath, can also be suitably used.

  The absorber 4 interposed between the liquid-impervious back sheet 2 and the top sheet 3 is made of, for example, pulp mixed with a highly water-absorbent resin or pulp mixed with a chemical fiber and having a high water absorption. A resin mixed with a conductive resin is used. The absorber 4 is made of crepe paper or non-woven fabric as shown in the figure in order to maintain the shape and quickly diffuse menstrual blood and the like as shown in the figure and to prevent the menstrual blood and the like once absorbed from returning. It can be surrounded by a wrapping sheet. Examples of the pulp include chemical pulp obtained from wood, cellulose fibers such as molten pulp, and artificial cellulose fibers such as rayon and acetate.Conifer pulp having a longer fiber length than hardwood pulp has a function and It is preferably used in terms of price. Further, as the absorber 4, an air-laid absorber that can reduce the bulk may be used.

  Further, synthetic fibers may be mixed in the absorber 4. The synthetic fibers may be, for example, polyolefins such as polyethylene or polypropylene, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyamides such as nylon, and copolymers thereof, and the like. It may be a mixture. In addition, composite fibers such as a core-sheath fiber, a side-by-side fiber, and a split fiber having a high melting point fiber as a core and a low melting point fiber as a sheath can also be used. In the case of a hydrophobic fiber, it is desirable to use a surface-treated synthetic fiber having a hydrophilic agent so as to have an affinity for a body fluid.

  Examples of the superabsorbent resin include a crosslinked product of polyacrylate, a crosslinked product of self-crosslinked polyacrylate, a saponified product of a crosslinked product of acrylate-vinyl acetate copolymer, a crosslinked product of isobutylene / maleic anhydride copolymer, Examples thereof include crosslinked polysulfonates and partially crosslinked water-swellable polymers such as polyethylene oxide and polyacrylamide. Of these, acrylic acid or acrylate-based compounds having excellent water absorption and water absorption speed are preferable. In the production process of the superabsorbent resin having the water absorbing performance, the water absorbing power and the water absorbing speed can be adjusted by adjusting the crosslinking density and the crosslinking density gradient. The content of the superabsorbent resin is desirably 10 to 60% of the weight of the absorber. When the content of the superabsorbent resin is less than 10%, sufficient absorption capacity cannot be provided. When the content is more than 60%, entanglement between pulp fibers is lost, and sheet strength is reduced to cause breakage or cracking. Is more likely to occur.

[Liquid-permeable back sheet 2]
Hereinafter, the liquid-impermeable back sheet 2 will be described in more detail. The liquid-impervious back sheet 2 is formed of a stretchable sheet that can be stretched in the longitudinal direction of the sanitary napkin 1, and the stretch force of the stretchable sheet is at least in a main body part where the absorber 4 is interposed. The stretchable portions 10 that have acted and the non-stretchable portions 11 that have been made non-stretchable by subjecting the stretchable sheet to non-stretching processing are alternately arranged in the longitudinal direction of the sanitary napkin 1. .

  As the elastic sheet constituting the liquid-impermeable backing sheet 2, it is preferable to use a laminated sheet obtained by laminating a nonwoven fabric and an elastic film, and particularly has a three-layer structure of nonwoven fabric / stretchable film / nonwoven fabric. It is preferable to use a laminated sheet. The stretchable film is a plastic film having stretchability, and specifically, a film such as a urethane-based film and an olefin-based elastomer can be used. It is preferable to use a stretchable sheet that is stretchable mainly in the longitudinal direction of the sanitary napkin 1 but hardly expands and contracts in the width direction.

  As the stretchable sheet, it is preferable to use a stretchable sheet having a stretch rate of 20% to 40% according to the method B (constant load method for fabric) of stretchability of stretchable woven fabric and knitted fabric of JIS L1096. The elongation rate of the underwear varies depending on the type, but generally the elongation rate is about 20% to 40%. Therefore, the stretchable sheet having an elongation rate substantially equal to the elongation rate of this general underwear is used. By using the same, it is possible to expand and contract in the same manner as underwear, to improve fit, and to further reduce displacement.

  The elastic portion 10 is a portion that is relatively elastically deformable in the longitudinal direction of the sanitary napkin 1 from the non-elastic portion 11 by the elastic force of the elastic sheet.

  The non-stretchable portion 11 is a portion in which a predetermined region of the stretchable sheet is subjected to a non-stretching process described later so that the stretchable sheet loses its stretching force. The above-mentioned "eliminated the stretching force" means that the stretching force of the stretchable sheet does not act at all due to the non-stretching process, or that only extremely small stretching force acts as compared with the stretching portion 10. Refers to the state in which Specifically, the elongation percentage of the non-stretchable part 11 is preferably 1/10 or less, particularly preferably 1/20 or less, with respect to the elongation rate of the elastic part 10.

  As shown in FIG. 1, the stretchable portion 10 and the non-stretchable portion 11 are arranged at least in the body where the absorber 4 is interposed between the liquid-permeable top sheet 3 and the liquid-impermeable backsheet 2. Napkins 1 are arranged alternately in the longitudinal direction. In the example shown in FIG. 1, the extendable portion 10 and the non-extendable portion 11 are formed in a substantially equal width strip elongated in the napkin width direction over substantially the entire width of the main body portion. The parts 11 are alternately arranged adjacent to each other in the napkin longitudinal direction. In the sanitary napkin 1 shown in FIG. 1, the non-stretchable portion 11 is provided only on the main body portion, and is not provided on the outer peripheral flap portion outside the main body portion. For this reason, the outer peripheral flap portion is the elastic portion 10 on which the elastic force of the elastic sheet acts over the entire circumference.

  In the sanitary napkin 1 having the above configuration, the elastic portions 10 and the non-elastic portions 11 are alternately arranged in the longitudinal direction of the napkin, whereby the elastic force of each elastic portion 10 acts independently, and Since the corresponding expansion and contraction force is exerted, it becomes easy to follow the movement of the wearer's body when walking, standing and sitting, and the like, and the fit is enhanced. In addition, since wrinkles and twists generated by the elastic portions 10 are absorbed by the non-stretch portions 11, a sanitary napkin with less wrinkles and twists and excellent in a feeling of wearing can be obtained.

  In FIG. 1, the interval between the elastic portions 10 and 10 adjacent in the longitudinal direction (the width of the non-elastic portion 11) and the interval between the adjacent non-elastic portions 11 and 11 (the width of the elastic portion 10) are each 5 It is good to be set to ５０50 mm, preferably 10１０〜20 mm. The stretchable portion 10 and the non-stretchable portion 11 have substantially the same width in the illustrated example, but may have different widths. Further, it is not necessary that each of the elastic portion 10 and the non-elastic portion 11 be formed in the same width in all regions, and both the widths or any one of the widths is different depending on the position in the longitudinal direction of the napkin. Is also good. For example, in the crotch region at the center in the longitudinal direction, the width of the elastic portion 10 is made relatively large in order to enhance the fit around the leg, and in the front and rear regions at both ends in the longitudinal direction, large contraction by the elastic portion 10 is prevented. Therefore, the width of the elastic portion 10 can be relatively reduced.

  It is preferable that the telescopic part 10 and the non-telescopic part 11 are arranged substantially parallel to the width direction line of the sanitary napkin 1. The term “substantially parallel to the napkin width direction line” means a width direction line orthogonal to the longitudinal direction line of the sanitary napkin 1 and the sanitary napkin 1 of each of the elastic portions 10, 10. Are formed at an angle of ± 5 ° or less, preferably ± 3 ° or less. In particular, as will be described later, when the non-stretchable portion 11 is provided with a slip-resistant pressure-sensitive adhesive layer 14 for fixing to underwear on the underwear-contacting surface side, the productivity in applying an adhesive is considered in consideration of the productivity. It is desirable that the elastic portion 10 and the non-elastic portion 11 are arranged substantially parallel to the napkin width direction line. However, in a region where the shift-preventing pressure-sensitive adhesive layer is not provided, it can be arranged in any direction regardless of the arrangement in parallel with the napkin width direction line.

  In the example shown in FIG. 1, the non-stretchable portion 11 is provided only on the main body portion and is not provided on the flap portion. It is possible to enhance the fit to the surroundings. Here, referring to FIG. 3, when the sanitary napkin 1 is divided into the respective regions, the first region A1 has the absorbent body 4 interposed between the liquid-permeable top sheet 3 and the liquid-impermeable back sheet 2. The sanitary napkin 1 is a region extending over the entire length of the sanitary napkin 1 including the main body portion and a flap portion extending forward and backward of the main body portion. The second region A2 is a region on the front side and the rear side of the wing-shaped flap W in the flap portion extending to the side of the main body portion. The third region A3 is a region where the wing-shaped flap W is formed in the flap portion extending to the side of the main body portion.

  As described above, in the first region A1, the elastic portions 10 and the non-elastic portions 11 can be alternately arranged in the napkin longitudinal direction (FIG. 1). In addition, the elastic portion 10 and the non-elastic portion 11 can be arranged in various patterns. A modification of this arrangement pattern will be described later.

  In FIG. 1, the second region A2 is a region constituted only by the elastic portion 10 without the non-elastic portion 11, but as shown in FIG. 4, the elastic portion to which the elastic force of the elastic sheet acts. It is also possible to alternately arrange the non-stretchable portions 10 and the non-stretchable portions 11 in which the stretchable sheet has been made non-stretchable by subjecting the stretchable sheet to non-stretching processing in the longitudinal direction of the napkin. This makes it easier for the flap portion of the second area A2 to follow the movement around the leg and to be more easily fitted, and also makes it less likely that wrinkles or twists will occur in the second area A2, and that the feeling of wearing is further improved. It is preferable that the telescopic part 10 and the non-telescopic part 11 of the second area A2 are arranged over substantially the entire width of the flap part. Further, the telescopic part 10 and the non-telescopic part 11 of the second area A2 and the telescopic part 10 and the non-telescopic part 11 of the first area A1 are connected to each other with respect to the napkin width direction. It is preferable to arrange so that 11 and 11 do not adjoin each other. That is, with respect to the napkin width direction, the non-stretchable portion 11 of the second region A2 is arranged adjacent to the stretchable portion 10 of the first region A1, and the second region adjacent to the non-stretchable portion 11 of the first region A1. The elastic part 10 of A2 is arranged. This makes it difficult for the expansion and contraction forces acting on the first area A1 and the second area A2 to interfere with each other, so that each area can easily fit the body by the expansion and contraction force acting on each area.

  In the case where the side flaps having substantially the same width are provided on both sides of the main body portion without providing the wing-shaped flaps W, respectively, the entire length of the side flaps is not in contact with the elastic portion 10. The elastic portions 11 may be alternately arranged in the napkin longitudinal direction. This makes it easier for the side flaps to fit around the legs over the entire length.

  In the third region A3, as shown in FIG. 4, the non-stretchable portion is provided on a flap portion (region A3 ') inside a virtual line 13 connecting the front and rear base portions 12, 12 of the wing-shaped flap W. It is preferable not to provide the part 11. Thereby, when the wing-shaped flap W is fixed so as to wind around the crotch portion of the underwear at the time of attachment, the folded portions along both side edges of the crotch portion of the underwear have elasticity over the entirety, and the circumference of the leg is improved. The fit can be improved.

  In the third area A3, as shown in FIG. 4, the wing-shaped flap W is fixed to the underwear, and the liquid-impervious back sheet 2 has a slip-resistant adhesive for the wing on the underwear contact surface side. In the case where a layer is provided, it is preferable to provide the non-stretchable portion 11 in a region where the anti-shift adhesive layer is provided. Thereby, the stress applied to the portion fixed to the undergarment is reduced, and the portion is less likely to be peeled off. It is desirable that the slip-preventing pressure-sensitive adhesive layer of the wing-shaped flap W be provided only on the non-stretchable portion 11 that does not include the stretchable portion 10, but it may be provided so as to partially include the stretchable portion 10. In the example shown in FIG. 4, the stretchable portions 10 and the non-stretchable portions 11 are alternately arranged in the napkin longitudinal direction at an intermediate portion of the wing-shaped flap W in the napkin width direction. At this time, the shift-preventing pressure-sensitive adhesive layer of the wing-shaped flap W may be discretely provided only in the non-stretchable portion 11 or may be continuously provided so as to include the stretchable portion 10 between the adjacent non-stretchable portions 11. It may be provided.

  Next, a description will be given of a modification of the arrangement pattern of the elastic portion 10 and the non-elastic portion 11 in the first area A1. As shown in FIG. The unit 11 may be provided. As a result, the expansion and contraction force does not act on the flap portions at the front and rear ends, and the occurrence of wrinkles and twists due to the contraction of the flap portions can be suppressed.

  Further, as another modified example, in FIG. 1, the expandable portion 10 and the non-extendable portion 11 are respectively provided over substantially the entire width of the main body portion. However, as shown in FIG. 6 and FIG. In the main body portion of the area A1 where the absorber 4 is interposed, the elastic part 10 and the non-elastic part 11 are arranged so as to have a staggered arrangement area in which the sanitary napkin 1 is alternately arranged in the longitudinal direction and the width direction. May be. The staggered arrangement region is defined as a front-rear, left-right, and right-rear when the elastic portion 10 and the non-elastic portion 11 are arranged on respective lattices in which the main body portion is divided into lattices along the longitudinal direction and the width direction of the sanitary napkin 1. This is a region where the same stretchable portion 10 or non-stretchable portion 11 is arranged so as not to be adjacent to each other in the lattice. In FIG. 6, substantially the entire surface of the main body portion is the staggered arrangement region. In FIG. 7, the region including the wing-shaped flap W of the main body portion and the region on the front side thereof are the staggered arrangement region. The non-stretchable portion 11 is provided in the widthwise central portion along the longitudinal direction in the region behind W, and the other portion is the stretchable portion 10.

  By providing the staggered arrangement regions of the elastic portion 10 and the non-elastic portion 11, it becomes possible to follow the movement of the body more finely, and the occurrence of wrinkles and twists is further suppressed. The area of the elastic portion 10 in the main body portion is preferably 40 to 70%, and more preferably 45 to 65%.

  As shown in FIG. 7, the pattern in which the staggered arrangement area is provided only in the area including the wing-shaped flap W and the area before the wing-shaped flap W and the area behind the wing-shaped flap W is mainly the elastic portion 10 is In addition, the napkin is suitable for a night sanitary napkin in which the rear portion of the napkin is formed long so as to widely cover the buttocks of the wearer to the rear. By thus increasing the area of the elastic portion 10 in the rear portion corresponding to the buttocks, the rear portion can easily follow the movement of the body, and the fit can be improved. Thus, the arrangement pattern of the elastic part 10 and the non-elastic part 11 does not necessarily have to be symmetrical (see FIG. 7).

  It is preferable to provide a slip-resistant adhesive layer 14 on the underwear contacting surface side of the liquid-impermeable backing sheet 2 in order to fix the sanitary napkin 1 to the underwear when worn on the body. The shift-preventive pressure-sensitive adhesive layer 14 can be provided in an arbitrary pattern. However, as shown in FIG. 1, the shift-preventive pressure-sensitive adhesive layer 14 is provided only on the non-stretchable portion 11 disposed on the liquid-impermeable backing sheet 2. It is preferable not to provide in the elastic part 10. By providing the slip-preventing pressure-sensitive adhesive layer 14 only on the non-stretchable portion 11, the stretching force of the liquid-impermeable backing sheet 2 does not act, so that the stress applied to the portion fixed to the undergarment is reduced and the peeling-off is difficult. At the same time, the elasticity of the elastic part 10 is more flexibly exhibited by not being provided in the elastic part 10.

  By the way, in order to maintain the external shape of the sanitary napkin 1 even when the elastic force of the elastic part 10 acts, the same method as the non-elastic part 11 is applied along the circumferential edge of the sanitary napkin 1 along the circumferential direction. May be provided. It is preferable that the entire circumference seal portion is formed over the entire circumference with a width of about 2 to 10 mm inward from the outer edge of the sanitary napkin 1.

  Next, a non-stretching process for forming the non-stretchable portion 11 on the stretchable sheet will be described. As shown in FIG. 8, in a state where the stretchable sheet unwound from the raw roll 20 of the stretchable sheet is stretched in the feed direction, a number of convex portions 21a, 21a,... Corresponding to the non-stretchable portions 11 are formed. By passing between the embossed roll 21 and the anvil roll 22 which is disposed to face the embossed roll 21 and has a flat surface, the stretchable sheet is embossed, and simultaneously heat and ultrasonic waves are applied. , The stretchable film constituting the stretchable sheet is subjected to a non-stretching process in which the stretchable film is thermally deformed in a stretched state and loses the stretchability of the embossed portion. Thereby, the non-stretchable portion 11 can be provided at a predetermined position of the stretchable sheet. In addition, the other portions that are not embossed become the elastic portions 10 in which the original elasticity is maintained.

  Further, a weakly elastic part in which the elasticity of the elastic sheet is reduced may be provided at the boundary between the elastic part 10 and the non-elastic part 11. In order to form the weakly stretchable portion, as shown in FIG. 9, a second protrusion having a lower protruding height around the protrusion 21a corresponding to the non-stretchable portion 11 to weaken the pressing force than the protrusion 21a. Using the embossing roll 21 ′ provided with the convex portion 21 b, the second convex portion 21 b also embosses the stretchable sheet and simultaneously applies heat or ultrasonic waves to reduce the stretchability of the embossed portion. Try to weaken. By providing the weakly stretchable portion, it is possible to prevent wrinkles and twists generated at the boundary between the stretchable portion 10 and the non-stretchable portion 11 due to a difference in their elongation rates.

[Other embodiments]
(1) In the above-described embodiment, the outlines of the elastic portion 10 and the non-elastic portion 11 provided in the main body are formed as straight lines substantially parallel to the longitudinal line and the width line of the sanitary napkin 1. As shown in FIG. 10, it may be formed by an arc-shaped line, a wavy line, a broken line, or the like.
(2) In the sanitary napkin 1, the substantially side edges of the absorbent body 4 are provided on both sides on the skin side as upright base ends, and the skin side is included in a predetermined section in the longitudinal direction so as to include at least the body fluid discharge part. A side nonwoven fabric forming a pair of left and right three-dimensional gathers protruding from the side wall may be provided. Like the liquid-impermeable backing sheet 2, the elongation of the thread-like elastic elastic member provided on the side nonwoven fabric for raising the three-dimensional gathers on the skin side is preferably 20% to 40%. .

  DESCRIPTION OF SYMBOLS 1 ... Sanitary napkin, 2 ... Liquid impervious back sheet, 3 ... Liquid permeable top sheet, 4 ... Absorber, 10 ... Elastic part, 11 ... Non-elastic part, 12 ... Base end part, 13 ... Virtual line, 20: raw roll, 21: emboss roll, 22: anvil roll

Claims (6)

In an absorbent article in which an absorber is interposed between a liquid-permeable top sheet and a back sheet,
The back sheet is formed of a stretchable sheet that can be stretched in the longitudinal direction of the absorbent article, and at least a body portion where the absorber intervenes, a stretchable portion where the stretchable force of the stretchable sheet acts, with lost stretching force of the elastic sheet by applying a non-stretchable reduction processed into elastic sheet and the non-contracted parts are alternately arranged in the longitudinal direction of the absorbent article, the absorbent on both sides of the body portion A flap portion where a body is not provided is provided, at least in the front region and the rear region of the flap portion, the stretchable portion and the non-stretchable portion are alternately arranged in the longitudinal direction of the absorbent article,
The elastic part and the non-elastic part of the main body part and the elastic part and the non-elastic part of the flap part are arranged such that the elastic parts and the non-elastic parts do not adjoin each other in the width direction of the absorbent article. absorbent article, characterized in that is. On both sides of the main body portion, wing-shaped flaps projecting to the side are formed so that the crotch portion of the underwear is wrapped around when worn,
The absorbent article of claim 1 Symbol mounting the non-contracted parts are not provided in the flap portions inward of the imaginary line connecting the base end portion of the front and rear of the wing-shaped flaps. The absorbent according to any one of claims 1 and 2 , wherein, in the main body portion, the stretchable portion and the non-stretchable portion have a staggered arrangement region in which the stretchable portion and the non-stretchable portion are alternately arranged in the longitudinal direction and the width direction of the absorbent article. Goods. The absorbent according to any one of claims 1 to 3 , wherein the pressure-sensitive adhesive layer for preventing slippage formed on the underwear contact surface side of the back sheet is provided in the non-stretchable portion, and is not provided in the stretchable portion. Goods. The absorbent article according to any one of claims 1 to 4 , wherein a weakly stretchable portion that weakens the stretchable force of the stretchable sheet is provided at a boundary between the stretchable portion and the non-stretchable portion. The stretchable sheet according to any one of claims 1 to 5 , wherein the stretch rate of the stretchability of stretchable fabric and knitted fabric according to JIS L1096 according to Method B (constant load method for fabric) is 20% to 40%. Absorbent articles.

Images