JP5065950B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article used for disposable paper diapers, sanitary napkins, panty liners, incontinence pads and the like.

  In absorbent articles such as sanitary napkins, the absorbent body moves in accordance with the movement of the wearer's body to maintain contact with the wearer's body and prevent body fluids such as menstrual blood from leaking. Required. For this reason, in patent document 1, it consists of an absorption layer and a leak-proof back sheet, and when the center part of the longitudinal direction of an absorber is fixed to a back sheet, the back part of an absorber is a free end. An absorbent article is disclosed.

Patent Document 2 discloses an absorbent article having a structure in which a top sheet and a back sheet are not bonded to each other on the rear end side, and an absorbent body can move freely for a certain distance. Patent Document 3 discloses an absorbent article having a structure in which a side sheet made of a material having elastic contraction force is folded in a zigzag shape, and a connecting sheet to which an absorber is fixed is joined to the side sheet. Yes.
Japanese Patent Laid-Open No. 11-104169 Japanese Patent Laid-Open No. 3-184542 JP 2001-245925 A

  However, in the structure described in Patent Document 1, since the rear portion of the absorbent body is completely separated from the back sheet, the degree of freedom of the rear portion is too high, and the absorbent body is bent or misaligned when the absorbent article is worn. This causes a problem of leakage of body fluid.

  In the structure described in Patent Document 2, since the absorber is in a free state on the rear end side, the rear end side is easy to move, and there is a problem in that a leak or a deviation occurs similarly.

  In the structure described in Patent Document 3, since the absorbent body is free in the entire longitudinal direction, the absorbent body can move freely with respect to the wearer's body, and there is a problem in that twisting and misalignment occur.

  Therefore, the present invention has an object to provide an absorbent article that can prevent leakage by suppressing the occurrence of twisting and shifting even when the absorbent body is moved by the movement of the wearer's body. And

  The absorbent article of the invention of claim 1 is an absorbent article formed in a vertically long shape with a liquid-impermeable leak-proof layer in contact with clothes and a liquid-retaining absorbent layer disposed on the leak-proof layer. The leak-proof layer is provided with fastening means that can be attached to and detached from the clothing on the back side, and the outer peripheral edge of the leak-proof layer is joined over the entire area at the outer peripheral edge and the outer peripheral edge joint of the absorbent layer. The at least the wearer's vaginal opening contact region on the front end side of the absorbent layer is fixed to the leak-proof layer by a fixing portion, and the non-fixed portion of the rear end side of the absorbent layer that is not fixed to the leak-proof layer. A slack portion is provided between the leak-proof layer and the absorbent layer so that a rear end portion of the leak-proof layer can be brought into contact with and separated from the absorbent layer.

  The invention according to claim 2 is the absorbent article according to claim 1, wherein the absorbent layer is a liquid-permeable surface sheet, and at least the skin contact surface side is covered over the entire surface sheet, and is integrally bonded. The outer peripheral edge joint portion is formed by the outer peripheral edge of the topsheet and the outer peripheral edge of the leakproof layer, and the slack portion is the non-fixed portion and the leakproof portion of the topsheet. It is formed between the layers.

  Invention of Claim 3 is an absorbent article of Claim 1 or Claim 2, Comprising: The said fastening means is provided in the rear end side of the said leak-proof layer at least to the lower part side of the movable area | region of an absorber. It is characterized by being.

  Invention of Claim 4 is an absorbent article of any one of Claim 1 thru | or 3, Comprising: The said slack part winds the said surface sheet between the said absorber and a leak-proof layer. It is a winding part, It is characterized by the above-mentioned.

  A fifth aspect of the present invention is the absorbent article according to any one of the first to third aspects, wherein the slack portion is a stretchable portion provided on the top sheet.

  Invention of Claim 6 is an absorbent article of any one of Claim 1 thru | or 3, Comprising: The said slack part extended the said surface sheet toward the width direction outer side. It is a part.

  A seventh aspect of the present invention is the absorbent article according to any one of the first to third aspects, wherein the slack portion folds the top sheet between the absorber and the leak-proof layer. It is a folding part.

  Invention of Claim 8 is an absorbent article of any one of Claim 1 thru | or 3, Comprising: In the said surface sheet, it is continuously from the said slack part in the side part of the said absorber, An elastic part that expands and contracts in the longitudinal direction is formed.

  According to the present invention, since the vaginal opening contact area on the front end side of the absorbent layer is fixed to the leak-proof layer, the front end side of the absorbent layer does not cause kinking or misalignment at the vaginal opening, preventing leakage of body fluids it can. Moreover, since the slack part which makes the rear-end part of a leak-proof layer contactable / separable with an absorption layer is formed, the rear-end part of an absorption layer can move freely with respect to a leak-proof layer. Therefore, the rear end portion of the absorbent layer moves in accordance with the movement of the body and is easily brought into close contact with the body, thereby preventing leakage.

  Hereinafter, the present invention will be described based on the illustrated embodiments. In each embodiment, the same member is assigned the same reference numeral.

(First embodiment)
1 to 8 show an absorbent article according to a first embodiment of the present invention, FIG. 1 is a plan view of the whole, FIG. 2 is a sectional view taken along line AA in FIG. 1, and FIG. 4 is an enlarged sectional view of a portion D in FIG. 3, FIGS. 5 to 8 are sectional views showing the operation, and FIG. 6 is a sectional view showing the operation along the line CC in FIG.

  This embodiment shows an application form to the sanitary napkin 1. It has a liquid-impermeable back sheet 3 in contact with clothes, a top sheet 2 provided on the back sheet 3, and an absorbent body 7 provided between the back sheet 3 and the top sheet 2, Is formed in a vertically long shape.

  The back sheet 3 serves as a leak-proof layer, and a hydrophobic nonwoven fabric, a water-impermeable plastic film, a laminate sheet of a nonwoven fabric and a water-impermeable plastic film, and the like can be used. Further, an SMS nonwoven fabric sandwiched between a melt-blown nonwoven fabric having high water resistance or a strong spunbond nonwoven fabric may be used.

  The top sheet 2 is made of a liquid-permeable sheet, and a liquid-permeable material such as a porous or non-porous nonwoven fabric or a porous plastic sheet can be used. The absorbent body 7 is formed of a material having liquid absorbability and liquid retention, and a material composed of a flak pulp or an airlaid nonwoven fabric and a superabsorbent polymer can be used.

  In this embodiment, the absorbent body 7 is bonded to the back surface of the top sheet 2 with an adhesive 5, and an absorbent layer is formed by the absorbent body 7 and the top sheet 2. The surface of the absorber 7 is a skin contact surface, and the top sheet 2 covers the entire surface of the skin contact surface.

  The outer peripheral edge of the top sheet 2 and the outer peripheral edge of the back sheet 3 are joined over the entire area at the outer peripheral joint. Joining at the outer peripheral edge joining portion is performed by providing an adhesive 4 between the outer peripheral edge of the topsheet 2 and the outer peripheral edge of the backsheet 3.

  The front end side of the absorbent body 7 is a vaginal opening contact region 7a that contacts the wearer's vaginal opening. As shown in FIG. 2, the vaginal opening contact region 7 a is formed by disposing an adhesive 4 between the back sheet 3 and the absorbent body 7 and bonding them together. In FIG. 2, reference numeral 7 b denotes a bonding fixing portion for bonding the vaginal opening contact region 7 a to the back sheet 3. Therefore, the vaginal opening contact area 7a of the absorbent body 7 is bonded to the back sheet 3 by the fixing portion 7b so as not to be peeled off.

  As shown in FIG. 2, in the front portion of the absorbent body 7 including the vaginal opening contact area 7a, the topsheet 2 is wound in a state where there is no slack to the lower side of the absorbent body 7 in the width direction. The end portion in the width direction folded back on the lower side of the absorbent body 7 is bonded to the back sheet 3 with the adhesive 4 in a state of extending outward in the width direction as it is.

  On the other hand, the rear end portion of the absorber 7 on the rear side of the vaginal opening contact region 7a is not disposed between the back sheet 3 and the back sheet 3 as shown in FIG. The non-fixed portion 7c is not bonded. In the non-fixed portion 7 c, the top sheet 2 is wound around the lower side of the absorber 7, and the portion wound around the lower side of the absorber 7 is folded back without being bonded to the back surface sheet 3. It extends outward from the end. Then, the surface sheet 2 is slackened by bonding the extended portion of the topsheet 2 to the backsheet 3, and this portion is a slack portion 8. Thus, by forming the slack portion 8 on the top sheet 2 corresponding to the non-fixed portion 7c, the absorber 7 and the back sheet 3 can move independently.

  The entrainment width L (see FIG. 4) of the topsheet is preferably 5 mm or more and 20 mm or less, and most preferably 10 to 20 mm. When L is less than 5 mm, the degree of freedom of the rear part of the absorbent body 7 is too small, so that followability to the body is not accompanied. When it exceeds 20 mm, the space between the back sheet 3 and the absorbent body 7 Therefore, the degree of freedom becomes too large, causing the absorber 7 to be twisted or displaced. In addition, the surface sheet 2 extended from the front-and-rear edge of the absorber 7 is adhere | attached with the back surface sheet 3 in the state without slack. You may integrate the absorber 7 and the surface sheet 2 by means, such as thermocompression bonding, without adhere | attaching.

  An adhesive layer 6 as a fastening means is provided on the back side of the back sheet 3. Thereby, the back sheet 3 can be attached to and detached from the clothes. The adhesive layer 6 is provided on the rear end side of the back sheet 3. In this case, as shown in FIG. 6, the adhesive layer 6 is preferably provided so as to reach the lower side of the movable region in which the absorber 7 moves. By providing the adhesive material 6 in this manner, the absorber 7 can be brought into close contact with the body as shown in FIG.

  In this embodiment, as shown in FIG. 5, over the entire length of the napkin 1, the top sheet 2 is wound in the width direction on the lower side of the absorber 7 with a dimension L (L = 5 mm to 20 mm), and the folded width is absorbed. The body 7 extends outward in the width direction. By this folding width L, the slack portion 8 of the top sheet 2 becomes a free portion having a length of 2L (see FIG. 5B). And since the part which adhere | attaches with the back surface sheet 3 is limited to the part extended outside rather than the width direction of the absorber 7, the slack part 8 in the surface sheet 2 will exist from 2L = 10mm-40mm. .

  When the napkin 1 is worn, as shown in FIG. 7, the rear end side of the absorbent body 7 is sandwiched and held between the butt cracks. On the rear end side of the absorbent body 7, as shown in FIG. 6, the back sheet 3 is fastened to the shorts (clothing) 10 by the adhesive 6, but the absorbent body 7 and the back sheet 3 are not bonded. The absorber 7 can move freely with respect to the back sheet 3. Therefore, when the shorts (clothing) 10 is in a tension state due to the operation when the sanitary napkin 1 is worn, even if the shorts 10 and the body are separated in the buttocks and the back sheet 3 is separated from the body, the absorber 7 On the rear end side, the slack portion 8 extends. For this reason, as shown in FIG. 8, the absorber 7 leaves | separates from the back surface sheet 3, is pinched | interposed into the crack of the buttocks, follows a body, and a clearance gap is not formed between the absorber 7 wearer's bodies. Since the absorbent body 7 fits into the crevice of the buttocks, leakage of body fluid such as menstrual blood can be prevented.

  In particular, in the case of a long-sized napkin for night use, in which menstrual flow is likely to occur backwards, the rear end side of the absorbent body 7 is caudal in the vicinity of the bone when worn, and the shorts 10 and the body are perfect at that position. In addition, since the top sheet 2 and the back sheet 3 are bonded and integrated on the rear end side of the absorber 7 and there is no degree of freedom, there is no occurrence of deviation or twist. The same applies to the front end side of the absorber 7.

  From the vicinity of the vaginal opening abutment region 7a to the rear, the crotch between the tail and the bone is a place where the clothing and the body are difficult to adhere to each other. In this part, since the back sheet 3 of the napkin 1 and the absorbent body 7 can be contacted and separated, the absorbent body 7 can be separated from the back sheet 3 and can be in close contact with the body without any deviation or twist. Thus, leakage can be prevented.

  In the vicinity of the vaginal opening contact area 7a, the napkin is strongly pressed against the body by clothing, so the absorber does not leave the body, and the napkin is deformed in the width direction by the pressure by both thighs in the closed leg state, and leakage occurs. Another problem is that it becomes easier. On the other hand, in this embodiment, since the absorber 7 and the back sheet 3 are bonded and integrated in this portion and there is no twist or misalignment, it is possible to prevent leakage due to these.

  In addition, since there is little movement of the body that acts on the napkin in front of the vaginal opening contact area 7a, even if the absorbent body 7 and the back sheet 3 are bonded, they do not bond. Also good.

  In the above embodiment, since the back sheet 3 and the absorber 7 are adhered in the vaginal opening contact area 7a on the front end side, the menstrual blood can be absorbed without any deviation from the body in this area 7a. . On the rear end side, the absorbent body 7 and the back sheet 3 are not bonded and can be contacted and separated. Therefore, on the rear end side, the absorbent body can be fixed to the shorts 10 via the adhesive 6. 7 can move between the body and the shorts 10, and even if there is a gap between the shorts and the body, the absorbent body 7 can follow the movement of the body and can prevent leakage of menstrual blood.

(Second Embodiment)
FIG. 9 shows a second embodiment of the present invention. In the sanitary napkin 1B of this embodiment, the water-repellent sheets 11 are arranged in the width direction on both sides of the absorbent body 7 bonded and integrated with the top sheet 2. The water-repellent sheet 11 is bonded to the back sheet 3 by the adhesive 5, but the lower side of the rear end side of the absorbent body 7 is only caught in the absorbent body 7 and is not bonded to the back sheet 3. In this way, the portion of the absorbent body 7 that is wound on the lower side becomes the slack portion 8. The water repellent sheet 11 covers both sides of the top sheet 2 in the width direction. By providing this water-repellent sheet 11, the same effect as in the first embodiment can be obtained, and menstrual blood does not leak through the top sheet 2, thereby reducing menstrual blood leakage. be able to.

(Third embodiment)
FIG. 10 shows a third embodiment of the present invention. In the sanitary napkin 1 </ b> C of this embodiment, stretchable portions 12 are provided on both side portions of the topsheet 2 in the width direction of the absorbent body 7. The stretchable part 12 can be formed by making a part of the topsheet 2 a stretchable material, and becomes the slack part 8 of the topsheet 2. In this way, by making the slack portion 8 the expansion / contraction portion 12, it is not necessary to wind the slack portion 8 below the absorber 7.

  The stretchable material used for the stretchable portion 12 of the present embodiment can be used without any problem as long as it stretches and stretches at least in the width direction of the product. It is preferable to arrange the fiber assembly.

  For example, a polyolefin fiber such as polypropylene and a stretch fiber such as polyurethane are mixed or piled, and after partially heat-sealing, stretched nonwoven fabric, stretch film such as polyurethane, or elastic yarn is stretched It is possible to use an elastic composite material that is combined with a nonwoven fabric made of polyolefin fibers such as polyurethane.

(Fourth embodiment)
FIG. 11 shows a fourth embodiment of the present invention. In the sanitary napkin 1 </ b> D of this embodiment, the slack portion 8 of the topsheet 2 is formed by forming the crooked portion 13 on the topsheet 2. The crooked portion 13 is formed by extending the top sheet 2 to the outside in the width direction of the absorbent body 7 without winding the top sheet 2 below the absorbent body 7. By forming the bent portion 13, the same effect as that of the first embodiment can be obtained.

(Fifth embodiment)
FIG. 12 shows a fifth embodiment of the present invention. The slack portion 8 of the sanitary napkin 1E of this embodiment is formed by a folded portion 14 that is folded by folding the top sheet 2 twice. Accordingly, the degree of freedom of the absorber 7 is greater than that of the first embodiment. The folding unit 14 may be folded back two or more times.

(Sixth embodiment)
FIG. 13 shows a sixth embodiment of the present invention. In the sanitary napkin 1F of this embodiment, the gather members 15 are disposed on both sides in the width direction of the laminate of the top sheet 2 and the absorbent body 7. A portion of the gather member 15 corresponding to the rear end side of the absorber 7 is wound around the lower side of the absorber 7. Thus, the slack portion 8 is formed by the gather member 15. The gather member 15 is provided with an elastic portion 16 that expands and contracts in the longitudinal direction so that the gather member 15 can be smoothly extended. By providing such a gather member 15, in addition to the same effects as in the first embodiment, the gather member 15 extends, so that a sense of security can be obtained and leakage can be reduced.

(Seventh embodiment)
FIG. 14 shows a seventh embodiment of the present invention. In the sanitary napkin 1G of this embodiment, the top sheet 2 is formed by the gather member 15. The gather member 15 has a slack portion 8 that is wound on the lower side of the absorber 7 on the rear end side of the absorber 7, and an elastic portion 16 that is provided in a portion extending to the side of the absorber 7. Yes. Thereby, the effect which combined 1st Embodiment and 6th Embodiment can be acquired.

(Eighth embodiment)
FIG. 15 shows an eighth embodiment of the present invention. In the sanitary napkin 1H of this embodiment, the gather members 15 are arranged on both sides of the absorbent body 7 in the width direction. Further, the top sheet 2 is bonded to the absorbent body 7, and the top sheet 2 is formed with a slack portion 8 that is wound downward on the rear end side of the absorbent body 7. The gather member 15 is disposed outside the absorbent body 7 in the width direction and has an elastic portion 16 that expands and contracts in the longitudinal direction.

  In addition, in the 6th Embodiment-8th Embodiment mentioned above, since the gather member 15 has the elastic part 16, it is not necessary to form the slack part 8 wound in the lower side of the absorber 7. FIG. .

1 is an overall plan view of a first embodiment of the present invention. It is the sectional view on the AA line of FIG. It is the BB sectional view taken on the line of FIG. It is the D section expanded sectional view in FIG. (A), (b) is sectional drawing which shows an action | operation. It is sectional drawing which shows the action | operation in the CC line of FIG. It is sectional drawing which shows an action | operation. It is sectional drawing which shows an action | operation. It is a fragmentary sectional view of a 2nd embodiment of the present invention. It is a fragmentary sectional view of a 3rd embodiment of the present invention. It is a fragmentary sectional view of 4th Embodiment of this invention. It is a fragmentary sectional view of a 5th embodiment of the present invention. It is a fragmentary sectional view of 6th Embodiment of this invention. It is a fragmentary sectional view of 7th Embodiment of this invention. It is a fragmentary sectional view of 8th Embodiment of this invention.

Explanation of symbols

1, 1A, 1B, 1C, 1D, 1E, 1F, 1G, 1H Sanitary napkin 2 Top sheet 3 Back sheet 4, 5 Adhesive 6 Adhesive layer 7 Absorber 7a Vaginal opening contact area 7b Fixed part 7c Non-fixed part 8 Loosening part 10 Clothes (shorts)
DESCRIPTION OF SYMBOLS 11 Water repellent sheet 12 Expansion-contraction part 13 Creeping part 14 Folding part 15 Gather member 16 Elastic part

Claims (8)

An absorbent article formed in a vertically long shape with a liquid-impermeable leak-proof layer in contact with clothes and a liquid-retaining absorbent layer disposed on the leak-proof layer,
The leak-proof layer is provided with a fastening means detachable from the clothes on the back side,
The outer peripheral edge of the leak-proof layer is bonded over the entire area at the outer peripheral edge and the outer peripheral edge joint of the absorbent layer,
At least the wearer's vaginal opening contact area on the front end side of the absorbent layer is fixed to the leak-proof layer with a fixing portion,
The rear end portion of the leakproof layer is in contact with and separated from the absorbent layer between the leakproof layer and the absorbent layer of the non-fixed portion of the rear end side that is not fixed to the leakproof layer of the absorbent layer. An absorbent article provided with a slack portion that enables it. The absorbent article according to claim 1,
The absorbent layer is formed of a liquid-permeable surface sheet and an absorbent body that is covered and integrated with at least the skin contact surface side of the surface sheet.
The outer periphery joint portion is formed by an outer periphery of the topsheet and an outer periphery of the leak-proof layer,
The said slack part is formed between the said non-fixing part of the said surface sheet, and the said leak-proof layer, The absorbent article characterized by the above-mentioned. The absorbent article according to claim 1 or 2,
The absorbent article is characterized in that the fastening means is provided at the rear end side of the leak-proof layer to at least the lower side of the movable region of the absorber. The absorbent article according to any one of claims 1 to 3,
The said slack part is an entrainment part which winds up the said surface sheet between the said absorber and a leak-proof layer, The absorbent article characterized by the above-mentioned. The absorbent article according to any one of claims 1 to 3,
The said slack part is an expansion-contraction part provided in the said surface sheet, The absorbent article characterized by the above-mentioned. The absorbent article according to any one of claims 1 to 3,
The said slack part is a crooked part which extended the said surface sheet toward the width direction outer side, The absorbent article characterized by the above-mentioned. The absorbent article according to any one of claims 1 to 3,
The said slack part is a folding part which folded the said surface sheet between the said absorber and a leak-proof layer, The absorbent article characterized by the above-mentioned. The absorbent article according to any one of claims 1 to 3,
The absorbent article, wherein the top sheet is formed with an elastic portion extending and contracting in a longitudinal direction on a side portion of the absorber continuously from the slack portion.

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