JP6159120B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article.

  Conventionally, a sanitary napkin is known in which pressing parts (embosses) configured to squeeze from the surface sheet to the absorbent body on both sides of the center line in the product width direction along the product longitudinal direction are known. (For example, refer to Patent Documents 1 and 2).

JP 2005-177078 A JP 2008-73449 A

  In emerging countries, wearers have a habit of wearing the same sanitary napkin for a long time. Therefore, in these countries, the wearer attaches importance to maintaining the shape of the sanitary napkin for a long time rather than obtaining a comfortable wearing feeling when the sanitary napkin is worn.

  However, in the sanitary napkin described in Patent Document 1, since a discontinuous compressed portion (emboss) exists only in the center region in the product width direction, it is applied from the outside in the product width direction to the inside by the wearer's foot. There is a problem that it is weak in force and it is difficult to maintain an appropriate shape for a long time.

  Moreover, in the sanitary napkin described in Patent Document 1, since the squeezed portion (emboss) exists only in the front and rear regions of the region corresponding to the wearer's excretion port, it is assumed that the sanitary napkin contacts the wearer's excretion port. In the region assumed to be, it is weak to the force applied from the outside to the inside in the product width direction by the wearer's foot, and there is still a problem that it is difficult to maintain an appropriate shape for a long time.

  Therefore, the present invention has been made in view of the above-mentioned problems, and by improving durability against force applied from the outside in the product width direction to the inside by the wearer's foot, an appropriate shape can be obtained for a long time. It aims at providing the absorbent article which can be maintained.

  The first feature of the present invention has a product longitudinal direction and a product width direction, and is a liquid-permeable top sheet, a liquid-impermeable back sheet, and between the top sheet and the back sheet. A pair of absorbent bodies arranged and squeezed from the top sheet to the absorbent body on both sides of the center line in the product width direction along the product longitudinal direction. It is an absorbent article provided with a first compressed groove, along the product longitudinal direction, on both sides of the center line in the product width direction and inside the product width direction from the first compressed groove, A pair of second squeezing grooves that squeeze at least the absorbent body are provided, and are configured to communicate with the pair of second squeezing grooves along the product width direction. That a third squeezing groove is being squeezed. And effect.

  As described above, according to the present invention, the durability against the force applied from the outside in the product width direction to the inside by the wearer's foot is improved, so that the absorption that can maintain an appropriate shape for a long time is achieved. A sex article can be provided.

It is the top view seen from the skin contact surface side of the absorptive article concerning a 1st embodiment of the present invention. It is AA sectional drawing in the top view seen from the skin contact surface side of the absorbent article which concerns on the 1st Embodiment of this invention. It is a figure for demonstrating the manufacturing method of the absorbent article which concerns on the 1st Embodiment of this invention.

  With reference to FIG. 1 thru | or FIG. 3, the absorbent article 1 which concerns on the 1st Embodiment of this invention is demonstrated.

  In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic and ratios of dimensions and the like are different from actual ones.

  Therefore, specific dimensions and the like should be determined in consideration of the following description. Moreover, the part from which the relationship and ratio of a mutual dimension differ also in between drawings may be contained.

  FIG. 1 shows a plan view (skin contact surface side) seen from the skin contact surface side of the absorbent article 1 according to the present embodiment, and FIG. 2 shows a cross-sectional view taken along line AA in FIG.

  The absorbent article 1 according to the present embodiment is, for example, a panty liner, an incontinence pad, a sanitary napkin (for daytime and nighttime), or the like. Hereinafter, in the present embodiment, a daytime sanitary napkin will be described as an example of the absorbent article 1, but the present invention is not limited to such an example.

  As shown in FIG. 1, the absorbent article 1 according to the present embodiment has a product longitudinal direction L and a product width direction W perpendicular to the product longitudinal direction L.

  Moreover, as shown in FIG. 2, the absorbent article 1 which concerns on this embodiment is arrange | positioned between the permeable top sheet 110, the liquid-impermeable back sheet 120, and the top sheet 110 and the back sheet 12. It has the absorber 2 made.

  The top sheet 110 can be used without particular limitation as long as it is a sheet-like material having a structure that allows liquid to permeate, such as a woven fabric, a nonwoven fabric, or a perforated plastic sheet.

  As the material for the woven fabric and the nonwoven fabric, any of natural fibers and chemical fibers can be used. Here, examples of the natural fiber include cellulose such as pulverized pulp and cotton. On the other hand, examples of the chemical fiber include regenerated cellulose such as rayon and fibril rayon, semi-synthetic cellulose such as acetate and triacetate, thermoplastic hydrophobic chemical fiber, or thermoplastic hydrophobic chemical fiber subjected to hydrophilic treatment. It is done.

  Examples of thermoplastic hydrophobic chemical fibers include single fibers such as polyethylene (PE), polypropylene (PP), and polyethylene terephthalate (PET), fibers formed by graft polymerization of polyethylene and polypropylene, and composite fibers such as a core-sheath structure. .

  In addition, the web forming in the nonwoven fabric may be performed by a dry method (a card method, a spun pond method, a melt blown method, an airlaid method, etc.), a wet method, or a combination of a plurality of them. Examples of the bonding method for the nonwoven fabric include methods such as serval bonding, needle punching, and chemical bonding, but are not limited to these methods. Moreover, you may use the spunlace formed in the sheet form by the hydroentanglement method as a nonwoven fabric.

  As the perforated plastic sheet, a perforated sheet of a thermoplastic resin such as PE, PP, or PET, a porous foam material, or the like can be used. Moreover, about these, it is also preferable to make it cloudy by mixing the filler which consists of a titanium oxide, a calcium carbonate, etc. in the range of 0.5 to 10% as needed. Further, a perforated film obtained by opening a film made of a thermoplastic resin by heat embossing, machining, or the like may be used. The perforated film may be used as a composite sheet with a nonwoven fabric.

  As the back sheet 120, a film mainly composed of PE or PP, a breathable resin film, a non-woven fabric such as spunbond or spunlace, a breathable resin film joined, a multi-layer SMS nonwoven fabric, etc. Can be used.

In consideration of flexibility so as not to impair the wearing feeling, for example, a film obtained from a basis weight of 15 to 30 g / m ² mainly composed of low density polyethylene (LDPE) resin is used as the back sheet 120. It is preferable.

  As shown in FIG. 2, the absorbent body 2 is configured by sandwiching the absorbent core 2 </ b> A between core wrap sheets 2 </ b> B / 2 </ b> C made of a non-work cloth such as tissue or SMS.

  As the material of the absorbent core 2A, pulverized pulp, cellulose such as cotton, regenerated cellulose such as rayon and fibril rayon, semi-synthetic cellulose such as acetate and triacetate, particulate polymer, fibrous polymer, thermoplastic hydrophobic chemical fiber, Alternatively, thermoplastic hydrophobic chemical fibers that have been subjected to a hydrophilic treatment, airlaid pulp that has been subjected to a chemical bond treatment, and the like can be used alone or in combination.

  The method of forming the absorbent core 2A from these materials is not particularly limited, but examples of such a method include a method of forming a sheet by an airlaid method, a meltblown method, a spunlace method, a papermaking method, or the like. .

  Moreover, a cellulose foam, a synthetic resin continuous foam, etc. can also be used as a material of the absorber core 2A. Furthermore, what was shape | molded after grind | pulverizing the above-mentioned foam or the material made into a sheet | seat as a material of 2 A of absorber cores can also be used.

  Furthermore, as the absorbent body 2, a thin absorbent body composed of an absorbent sheet or a polymer sheet having a thickness of 0.3 to 5 mm can also be used. Here, as the absorbent sheet or polymer sheet, those used for absorbent articles such as ordinary sanitary napkins can be used without particular limitation.

  For example, examples of the absorbent sheet include absorbent paper, non-woven fabric, and pulp sheet obtained by forming fibers into a sheet with a binder, etc., and polymer sheets are formed by mixing pulverized pulp and fibers with a particulate polymer to form a sheet. Etc. In addition, as for what formed the polymer by mixing particulate polymer with the fiber, it is possible to use any of those in which the particulate polymer is distributed in layers and those in which the particulate polymer is dispersed three-dimensionally. it can.

  Here, as materials used for the material forming the absorbent sheet and the polymer sheet, cellulose fibers such as wood pulp, regenerated cellulose fibers such as rayon and cupra, hydrophilic synthetic fibers such as polyvinyl alcohol fibers and polyacrylonitrile fibers, or It is preferable to use polyethylene, polypropylene, polyethylene terephthalate, polyethylene / polypropylene composite fiber, polyethylene / polyethylene terephthalate composite fiber whose surface has been hydrophilized with a surfactant or the like, and cellulose fiber from the viewpoint of maintaining good hydrophilicity. It is more preferable to use

  As the particulate polymer used for the polymer sheet, it is preferable to use a polymer that can absorb and retain a liquid having a weight 20 times or more of its own weight and can be gelled. Examples of such particulate polymers include starch, cross-linked carboxymethylated cellulose, polyacrylic acid and its salts, and polyacrylate graft polymers.

  Moreover, the absorbent article 1 which concerns on this embodiment has a pair of side flap 3 formed so that it may extend to the both outer sides of the product width direction W of the absorbent article 1, as shown in FIG. doing.

  As shown in FIG. 2, the side flap 3 includes a side sheet 130 and a back sheet 120.

  Here, the side sheet 130 may be made of the same material as that of the top sheet 110, for example. However, in order to prevent menstrual blood from flowing over the side sheet 130 to the outside in the product width direction W of the absorbent article 1, the side sheet 130 may be made of a material having hydrophobicity or water repellency. preferable.

  Specifically, as the side sheet 130, a spunbond nonwoven fabric or an SMS nonwoven fabric can be used. Or since the side seat | sheet 130 comprises a contact surface with a wearer's skin, in order to reduce the abrasion irritation | stimulation to a wearer's skin, it is preferable to use an air through nonwoven fabric.

  As shown in FIG. 2, in the absorbent article 1 according to this embodiment, the top sheet 110 and the absorbent body 2 are joined together by an adhesive 210 such as a hot melt adhesive (HMA), and the back sheet. 120 and the absorber 2 are joined together by an adhesive 220 such as a hot-melt adhesive. Moreover, you may be comprised so that the absorber 2 may be enclosed by joining the surface sheet 110 and the back surface sheet 120. FIG.

  For example, hot melt is applied to one of the substrates (for example, the top sheet 110, the back sheet 120, and the absorber 2) by a coating method such as spiral coating, coater coating, curtain coater coating, or summit gun coating. A mold adhesive may be applied, and the stretchable material and the other base material may be overlapped and joined thereto. Here, in order to make it difficult for the stretchable material to come off the base material, a hot melt adhesive may be applied to the stretchable material in advance by a coating method such as slit coating or control seam coating. Good.

  Rubbers such as SEBS (styrene-ethylene-butadiene-styrene block copolymer), SBS (styrene-butadiene-styrene block copolymer), SIS (styrene-isoprene-styrene block copolymer) as hot melt adhesives Pressure-sensitive adhesives and heat-sensitive adhesives mainly composed of olefins such as polyethylene and linear low-density polyethylene, water-soluble polymers such as polyvinyl alcohol, carboxymethylcellulose and gelatin, or water-swellable polymers Examples thereof include water sensitive adhesives such as polyvinyl acetate and sodium polyacrylate.

  Among them, even if the hot melt adhesive oozes out on the outer surface, it is preferable to use a heat sensitive adhesive because it does not have tackiness at that time. For example, a melt-mixed mixture of 5 to 25% SEBS, 40 to 60% alicyclic saturated hydrocarbon, 1 to 10% aromatic modified terpene, and 15 to 30% additive may be used.

  Further, the side sheet 130 and the top sheet 110 are joined by heat embossing.

  Moreover, these joining may be comprised so that it may be implement | achieved by using adhesives, such as a hot-melt-type adhesive agent, heat embossing, an ultrasonic wave, etc. individually or in combination.

  Further, on the non-skin contact surface side of the back sheet 20, the adhesive 230 for preventing the shift of the central region of the absorbent article 1 in the product width direction W and the shift of the side flap 130 are prevented. An adhesive 240 is applied.

  In addition, the adhesive 230/240 is applied to the packaging sheet side of the absorbent article 1, and is transferred to the non-skin contact surface side of the back sheet 20 when the absorbent article 1 is packaged in the packaging sheet. It may be configured as follows.

  As the adhesive 230/240, for example, a styrene block polymer as a thermoplastic polymer, a natural resin or a synthetic resin as a tackifier resin, a paraffin oil as a plastic material, or the like can be used.

  Examples of the styrene block polymer include SEBS, SBS, SIS, SEPS (styrene-ethylene-propylene-styrene copolymer). Synthetic resins include aliphatic (C5) petroleum resins, aromatic (C9) petroleum resins, copolymerized petroleum resins, hydrogenated petroleum resins, DCPD petroleum resins, pure monomer petroleum resins, and the like. Can be mentioned. Furthermore, examples of natural resins include terpene resins that are copolymers of α-pinene, β-pinene, or dipentene, rosin resins that are gum rosin, tall oil rosin, or wood rosin, or hydrogenated products or esters thereof. . Examples of the plastic material include a paraffin oil system that lowers viscosity, a naphthenic oil that increases tackiness, and an aroma oil that reduces cohesion and imparts color and odor.

The application basis weight of the adhesive 230/240 is 10 to 100 g / m ² , and preferably 20 to 50 g / m ² . Here, when the application basis weight of the pressure-sensitive adhesive 230/240 is 10 g / m ² or less, the absorbent article 1 cannot be firmly attached to the underwear, and the wearer falls off or shifts during use. Will be uncomfortable. On the other hand, when the application basis weight of the adhesive 230/240 is 100 g / m ² or more, when the absorbent article 1 is peeled from the underwear, the absorbent article 1 is torn and the underwear is no longer usable. There is a fear.

  Moreover, as shown in FIG. 1, the absorbent article 1 according to the present embodiment includes at least a pair of first compressed grooves 11 / on both sides of the center line O in the product width direction W along the product longitudinal direction L. 12 is provided.

  Specifically, in the example illustrated in FIG. 1, the first pressing groove 11 is an annular pressing groove, and has a region extending along the product longitudinal direction L and a region extending along the product width direction W. .

  The first pressing groove 12 is also an annular pressing groove provided outside the first pressing groove 11 and has a region extending along the product longitudinal direction L and a region extending along the product width direction W. You may do it.

  In the absorbent article 1 according to this embodiment, the shape of the first compressed groove 11/12 may be an arbitrary shape such as an elliptical shape or a polygonal shape formed by a straight line or an arbitrary curve. .

  That is, in the absorbent article 1 which concerns on this embodiment, the 1st pressing groove 11/12 should just have the area | region extended along the product longitudinal direction L, and is necessarily enclosed by the straight line and arbitrary curves. It does not have to be an annular squeeze groove.

  Moreover, in the absorbent article 1 which concerns on this embodiment, at least a pair of 1st pressing groove should just be provided, and arbitrary numbers of 1st pressing grooves may be provided.

  Furthermore, the 1st pressing groove 11/12 is comprised by integrating and pressing the surface sheet 110 and the absorber 2. FIG.

  As shown in FIG. 2, the 1st pressing groove 11/12 is comprised so that the surface sheet 110 to the absorber 2 may be squeezed.

  Further, as shown in FIG. 1, the absorbent article 1 according to the present embodiment has a product width that is longer than the first pressing groove 12 on both sides of the center line O in the product width direction W along the product longitudinal direction L. A pair of second squeezing grooves 20 are provided inside the direction W.

  Here, the 2nd pressing groove 20 is comprised by pressing the absorber 2 at least.

  Further, the absorbent article 1 according to the present embodiment is provided with a third pressing groove 40 configured to communicate the pair of second pressing grooves 20 along the product width direction W.

  Here, the 3rd pressing groove 40 is comprised by squeezing the absorber 2 at least.

  The second pressing groove 20 and the third pressing groove 40 are provided in the crotch region C of the absorbent article 1. Here, the crotch region C of the absorbent article 1 is affixed to a region (that is, a crotch portion of the underwear) that is assumed to contact the vicinity of the wearer's excretion opening when the absorbent article 1 is attached to the underwear. It is an assumed area). It is.

  For example, the crotch region C of the absorbent article 1 may be a region between the bases of the side flaps 3 in the product longitudinal direction L as shown in FIG.

  When the wearer is wearing the absorbent article 1, force is applied to the absorbent article 1 from the outside in the product width direction W to the inside by the wearer's foot. On the other hand, according to the above-mentioned structure, durability with respect to this force can be improved by the 3rd pressing part 40 provided along product width direction W, and absorbent article 1 can be used for a long time. An appropriate shape can be maintained.

  For example, the 2nd pressing groove 20 and the 3rd pressing groove 40 may be comprised so that from the surface sheet 110 to the absorber 2 may be squeezed, as shown in FIG. According to this structure, since the rigidity of the absorbent article 1 can be further increased, durability against force can be further improved from the outside to the inside in the product width direction W by the wearer's foot.

  Or the 2nd pressing groove 20 and the 3rd pressing groove 40 may be comprised so that only the absorber 2 may be squeezed. According to such a configuration, it is possible to achieve an effect that the wearer does not feel uncomfortable when the absorbent article 1 is mounted.

  Moreover, as shown in FIG. 1, the 2nd pressing groove 20 may have the linear shape along the product longitudinal direction L. As shown in FIG.

  According to such a configuration, even when the mounting position of the absorbent article 1 on the undergarment is shifted, the force applied from the outside to the inside in the product width direction W by the wearer's foot is entirely applied to the second compressed groove 20. It can be received and durability against such force can be further improved.

  Moreover, as shown in FIG. 1, the 3rd pressing groove 40 may be provided so that the center line O of the product width direction W may be straddled.

  According to such a configuration, when the absorbent article 1 is mounted at an accurate position of the underwear, the third force is applied to the region where the force applied from the outside to the inside in the product width direction W by the wearer's foot is assumed to be strongest. By arranging the compressed groove 40, the durability against such force can be optimally improved.

  Moreover, as shown in FIG. 1, the 3rd pressing groove 40 has a linear shape, and is provided so that the center of a pair of 2nd pressing groove 20 in the product longitudinal direction L may communicate. Also good.

  Further, the absorbent article 1 according to the present embodiment communicates each of the end portions T1 to T4 of the second compressed groove 20 and each of the centers L1 / L2 of the second compressed groove 20 in the product longitudinal direction L. The 4th pressing groove 30A / 30B / 31A / 31B comprised by may be provided.

  Here, the 4th pressing groove 30A / 30B / 31A / 31B is comprised by pressing the absorber 2 at least.

  That is, as shown in FIG. 1, the absorbent article 1 according to the present embodiment communicates the end T1 of the second compressed groove 20 and the center L2 of the second compressed groove 20 in the product longitudinal direction L. The 4th pressing groove 30A comprised so that the 4th pressing groove 30B comprised, the edge part T2 of the 2nd pressing groove 20, and the center L1 of the 2nd pressing groove 20 in the product longitudinal direction L may be connected. The 4th pressing groove 31A comprised so that the edge part T3 of the 2nd pressing groove 20 and the center L2 of the 2nd pressing groove 20 in the product longitudinal direction L may be connected, and the edge part T4 of the 2nd pressing groove 20 And the 4th pressing groove 31B comprised so that the center L1 of the 2nd pressing groove 20 in the product longitudinal direction L may be connected.

  According to this structure, in the area | region where the absorber 2 is arrange | positioned, in addition to the 2nd pressing groove 20 and the 3rd pressing groove 40, a bodily fluid is diffused along 4th pressing groove 30A / 30B / 31A / 31B. And body fluid can be efficiently diffused over a wide area.

  Further, according to such a configuration, durability is improved even when a force is applied in an oblique direction with respect to the inner side of the product width direction W in the region where the absorbent body 2 is arranged by an operation such as walking of the wearer. be able to.

  Moreover, in the absorbent article 1 which concerns on this embodiment, a pair of 1st pressing groove 11 (or 1st pressing groove 12) has the convex part B which becomes a convex shape inside the product width direction W, respectively. Also good.

  And the above-mentioned convex part B may be provided on the extended line of the straight line which connects intersection L1 / L2 of the 2nd pressing groove 20 and the 3rd pressing groove 40. FIG.

  According to such a configuration, the third pressing groove 40 is provided between the convex portions B where the force applied from the outer side to the inner side in the product width direction W is easily concentrated by the wearer's foot, thereby providing durability against the force. It can be improved further.

  Moreover, in the absorbent article 1 which concerns on this embodiment, you may be comprised so that the 1st pressing groove 12 and the 2nd pressing groove 20 may not be connected. That is, in the absorbent article 1 which concerns on this embodiment, it may be comprised so that the area | region where the squeezing is not performed between the 1st pressing groove 12 and the 2nd pressing groove 20 may exist.

  According to such a configuration, the force applied from the outer side to the inner side in the product width direction W by the wearer's foot is received by the first pressing groove 11/12, and the propagation to the region where the absorber 2 is disposed can be reduced. it can.

  Furthermore, in the absorbent article 1 which concerns on this embodiment, the length between the 2nd pressing grooves 20 in the product width direction W may be comprised so that it may become shorter than 20 mm.

  According to this structure, since the length between the 2nd pressing grooves 20 in the product width direction W is narrower than the width | variety between a wearer's both feet, there can exist an effect that it does not give a discomfort to a wearer. .

  In addition, in the absorbent article 1 which concerns on this embodiment, the above-mentioned 1st pressing groove 11/12. Squeezing parts other than the second pressing groove 20, the third pressing groove 40, and the fourth pressing groove 30A / 30B / 31A / 31B may be provided.

  Hereinafter, with reference to FIG. 3, the manufacturing method of the absorbent article 1 which concerns on this embodiment is demonstrated.

  As shown in FIG. 3, in step S101, the 2nd pressing groove 20, the 3rd pressing groove 40, and the 4th pressing groove 30A / 30B / 31A / 31B are formed with respect to the absorber 2. As shown in FIG.

  After the top sheet 110 is bonded to the absorbent body 2, the first compressed groove 11/12 is formed in step 102. Then, the back sheet 120 and the side sheet 130 are bonded together.

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

DESCRIPTION OF SYMBOLS 1 ... Absorbent article 2 ... Absorber 2A ... Absorber core 2B, 2C ... Core wrap sheet 3 ... Side flaps 11, 12 ... Squeeze groove 20 ... Longitudinal squeeze groove 30A, 30B, 31A, 31B ... Inclined squeeze groove 40 ... Width direction compressed groove 110 ... top sheet 120 ... back sheet 130 ... side sheets 210 and 220 ... adhesives 230 and 240 ... adhesive

Claims (5)

It has a product longitudinal direction and product width direction,
It has a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber disposed between the top sheet and the back sheet,
An absorbent article provided with a pair of first squeezing grooves configured to squeeze from the top sheet to the absorbent body on both sides of the center line in the product width direction along the product longitudinal direction. Because
A pair of second squeezing grooves that squeeze at least the absorbent body along the product longitudinal direction on both sides of the center line in the product width direction and inside the product width direction with respect to the first squeezing groove. Provided,
Along with the product width direction, a third squeezing groove configured to communicate the pair of second squeezing grooves and squeezing at least the absorber is provided ,
The second pressing groove has a linear shape,
The third pressing groove has a linear shape, and is provided so as to communicate the centers of the pair of second pressing grooves in the product longitudinal direction,
Four fourth squeezing grooves configured to communicate each of the end portions of the second squeezing groove and each of the centers of the second squeezing grooves in the product longitudinal direction are provided. to, the absorbent article.   The absorbent article according to claim 1, wherein the third pressing groove is provided so as to straddle a center line in the product width direction.   The absorbent article according to claim 1 or 2, wherein the second pressing groove and the third pressing groove are configured to squeeze from the top sheet to the absorber.   The absorbent article according to claim 1 or 2, wherein the second pressing groove and the third pressing groove are configured to squeeze only the absorber. Each of the pair of first squeezing grooves has a convex portion that is convex inward in the product width direction,
The absorptivity according to any one of claims 1 to 4 , wherein the convex portion is provided on an extended line of a straight line connecting the intersections of the second pressing groove and the third pressing groove. Goods.

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