JP6284175B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article used to absorb excrement such as urine. More specifically, the present invention relates to an absorbent article such as an absorbent pad, a tape-type paper diaper, or a pants-type paper diaper disposed on the use surface side of a lower body underwear or a paper diaper.

  The absorbent pad, which is an example of the absorbent article, is used by being attached to the inner surface of a tape-type or pants-type disposable diaper or the lower body underwear for the purpose of reducing diaper replacement costs and toilet training (for example, (See Patent Document 1 or 2).

  A general absorbent pad has a basic structure in which an absorbent that absorbs bodily fluid is interposed between a top sheet and a leak-proof sheet. Covers the back side of the sheet.

  There is also a product in which solid gathers are arranged along the front-rear direction at both ends in the width direction on the use surface side of the absorbent pad. When such a product is worn, the three-dimensional gather rises toward the wearer's use surface side, and as a result, side leakage of excrement from the absorbent pad can be prevented.

  Further, the absorbent pad is generally a sheet and has a substantially rectangular shape. In addition, in the crotch part of the absorbent body, a pair of depressions are provided from the outer side in the width direction to the center side, and the width in the width direction of the crotch part of the absorbent pad is reduced to fit with the wearer's thigh. Some have improved sexiness.

  As an example of the absorbent pad, an absorbent article in which an elastic member is disposed in parallel to the longitudinal direction of the main body portion with respect to the side wall portion is disclosed (Patent Document 3). When the elastic member contracts, a side wall portion contracts and rises toward the wearer side on the side of the absorbing portion, and a three-dimensional gather that abuts near the wearer's base when worn is formed.

  In addition, an absorbent article in which a first elastic member and a second elastic member are disposed in an extended state along the longitudinal direction of the absorbent article is also disclosed (Patent Document 4). By contracting each elastic member, the fit is improved and the lateral leakage of excrement such as menstrual blood can be surely prevented.

JP 2005-287791 A Japanese Patent Laid-Open No. 2003-210524 Japanese Patent No. 4459753 JP 2009-178274 A

  However, in the conventional absorbent articles as described in Patent Documents 3 and 4, the rising start points of the three-dimensional gathers provided on both sides in the width direction of the absorbent article are not determined, and the rising height of the three-dimensional gathers tends to vary.

  More specifically, at the stage where the absorbent article is spread before being worn, the three-dimensional gather often does not stand up from the hollow part, but often rises from an arbitrary part outside the fit cut part in the width direction. As a result, there is a problem that when the product is worn, the legs are easily caught on the three-dimensional gathered portion.

  In addition, at the stage where the absorbent article is worn, the side walls of the three-dimensional gather are overlapped by the wearer's leg pressure, and the height at which the three-dimensional gather rises cannot be sufficiently secured in many cases. As a result, the adhesion between the wearer's thigh and the three-dimensional gather is weak, and there is a problem from the viewpoint of preventing leakage.

  Further, when the elastic member is disposed in parallel with the longitudinal direction of the absorbent pad as in the conventional example, the absorber may be contracted when the elastic member contracts. Such a problem is likely to occur particularly when the distance between the elastic member and the absorber is short.

  Then, the main objective of this invention is to start up a three-dimensional gather from the hollow part provided in the absorbent article. And it is in strengthening the adhesiveness of a wearer's thigh and three-dimensional gathers, and preventing side leakage of excrement. Further, when the elastic member contracts, the absorber is prevented from contracting accordingly.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
Including a top sheet that contacts the skin of the wearer, a bodily fluid absorber provided on the back side of the top sheet, and a leak-proof sheet that prevents transition of the bodily fluid provided on the back side of the absorber,
On both sides in the width direction, elastic stretch members are provided along the front-rear direction at least on the side edges, and have a three-dimensional gather that stands on the use surface side due to the contraction force of the elastic stretch members when used.
On both sides of the absorbent body in the front-rear direction intermediate portion, a recess portion recessed toward the center in the width direction is provided, and at least in the region surrounded by the recess portion, the top sheet and the back side sheet material are used. Formed, and more flexible than the absorbent body, the easy deflection portion is configured to be interlocked with the standing of the three-dimensional gather,
The hollow portion or the vicinity of the outside of the hollow portion is formed with higher rigidity than other portions of the easily-flexible portion,
On the standing base side of the three-dimensional gather sheet, an intermediate elastic expansion / contraction member is fixed in the longitudinal range substantially the same as the flexible portion,
The intermediate elastic elastic member is a form that bulges outward in the width direction in a plan view in a state where the three-dimensional gather is expanded outward in the width direction,
The intermediate elastic elastic member is fixed to the three-dimensional gather overlapping the same position as the easy-flexible part in a plan view in a state where the three-dimensional gather is tilted inward in the width direction. Sex goods.

(Function and effect)
By providing a portion with high rigidity near the hollow portion or the outside of the hollow portion, a three-dimensional gather can be raised with the portion having high rigidity as a starting point. As a result, when the absorbent article is worn, it is difficult for the foot to get caught in the three-dimensional gathered portion. Further, when the absorbent article is worn, it is possible to avoid a state in which the side walls of the three-dimensional gather overlap with each other due to the leg pressure of the wearer, and it is possible to sufficiently secure the height at which the three-dimensional gather rises. As a result, the adhesiveness between the wearer's thigh and the three-dimensional gather is strengthened, and the lateral leakage of excrement can be prevented.
Further, as described above, the intermediate elastic stretchable member is provided, and the intermediate elastic stretchable member contracts, so that it is easier to start up the three-dimensional gather from a portion having higher rigidity. As a result, the adhesiveness between the wearer's thigh and the three-dimensional gather is strengthened, and the lateral leakage of excrement can be prevented. In addition, by disposing the intermediate elastic stretchable member so as to curve outward, the absorber can be prevented from contracting.

<Invention of Claim 2>
The absorbent article having a three-dimensional gather according to claim 1, wherein the high-rigidity portion is formed by any means selected from the group consisting of heat sealing, ultrasonic waves, and heat embossing.

(Function and effect)
By using any means of heat sealing, ultrasonic waves, and heat embossing, the highly rigid portion can be easily formed. As a result, a decrease in manufacturing efficiency of the absorbent article can be suppressed. Ultrasonic waves are particularly preferred for reasons such as high production speed and low rigidity.

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<Invention of Claim 3>
The absorbent article having a three-dimensional gather according to claim 1 or 2, wherein the absorbent article is an absorbent pad, a tape-type paper diaper, or a pants-type paper diaper that is disposed on the use surface side of a lower body underwear or a paper diaper.

(Function and effect)
The present invention can be applied not only to an absorbent pad, but also to a tape-type paper diaper or a pants-type paper diaper having a recessed portion and a three-dimensional gather.

  As described above, according to the present invention, a three-dimensional gather can be raised from the depression. And the adhesiveness of a wearer's thigh and a three-dimensional gather can be strengthened, and the side leakage of excrement can be prevented. Moreover, when an elastic member shrink | contracts, it can prevent that an absorber shrink | contracts with it.

It is a top view of the absorption pad which concerns on 1st Example (there is a highly rigid part, and there is no intermediate elastic expansion-contraction member) of this invention. It is the absorption pad which concerns on the 1st Example of this invention, Comprising: It is the top view which showed the state which expand | deployed the solid gather part to the width direction outer side. It is AA sectional drawing of FIG. It is AA sectional drawing of FIG. 1, Comprising: It is the figure which showed the state which the solid gathers stood up. It is BB sectional drawing of FIG. 1 and FIG. It is CC sectional drawing of FIG. It is a top view of the absorption pad which concerns on 2nd Example (there is a highly rigid part, and there exists an intermediate elastic expansion-contraction member) of this invention. It is an absorption pad which concerns on the 2nd Example of this invention, Comprising: It is the top view which showed the state which expand | deployed the solid gather part to the width direction outer side. It is DD sectional drawing of FIG. It is DD sectional drawing of FIG. 7, Comprising: It is the figure which showed the state which the solid gathers stood up. It is EE sectional drawing of FIG. It is the absorption pad which concerns on the 2nd Example of this invention, Comprising: It is the perspective view which showed the state which the solid gathers stood up. It is a top view of the underpants type paper diaper concerning the present invention. It is a top view of a tape type paper diaper concerning the present invention. It is the top view corresponding to FIG. 8, and is a figure which showed the variation of the shape of a highly rigid part and an intermediate | middle elastic elastic member.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
(First form)
1-7 has shown the absorption pad 200 of the 1st form. The absorbent pad 200 has a front-rear direction center portion C1 and a ventral (front) portion F1 extending forward and a back-side (rear) portion B1 extending rearward. The dimension of each part can be determined as appropriate. For example, the total length (length in the front-rear direction) L1 can be about 400 to 600 mm, and the total width W1 can be about 120 to 200 mm.

  The absorbent pad 200 has a basic structure in which an absorber 23 is interposed between the top sheet 22 and the leak-proof sheet 21.

(Surface sheet)
The top sheet 22 captures the moisture of excrement and moves it to the absorber 23. The top sheet 22 is preferably a liquid-permeable material, for example, a nonwoven fabric formed of hydrophilic fibers. As the material fiber constituting the nonwoven fabric, synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester and amide, recycled fibers such as rayon and cupra, and natural fibers such as cotton can be used.

(Absorber)
As the absorbent 23 that absorbs the moisture of excrement, a material obtained by mixing, adhering, or the like with a superabsorbent polymer as required is basically used, which is a pulp fiber pile, cotton-like pulp, or non-woven fabric. Can do. And the absorber 23 can be wrapped with crepe paper (not shown) as needed. Moreover, the shape of the absorber 23 can be made into the rectangular shape from which the width | variety from the front side to the back side is substantially the same, for example. Or it can also be set as appropriate shapes, such as a trapezoid shape whose front part is relatively wider than the rear part. Although the fiber basis weight and the basis weight of the absorbent polymer in the absorbent body 23 can be determined as appropriate, the fiber basis weight is preferably about 100 to 600 g / m ^2, and the basis weight of the absorbent polymer is about 0 to 400 g / m ^2. It is preferable to do this. The absorber 23 has a semi-rigid property, and has a property of bending when a certain force or more is applied due to the contraction force or leg pressure of the elastic elastic member. Further, the location where the absorber 23 is present has a property that it is less likely to bend than a location where the absorber 23 is not present, such as the easily deflectable portion 28.

(Leak-proof sheet)
On the back surface side of the absorbent body 23, a leak-proof sheet 21 is provided that prevents the excretion from transferring to the back surface. As the leak-proof sheet 21, in addition to a polyethylene film or the like, a sheet having moisture permeability without impairing water shielding properties can be used from the viewpoint of preventing stuffiness. This water-impervious / breathable sheet is a microporous sheet obtained by, for example, melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. Can be used.

(Exterior sheet)
You may make it cover the outer surface (back surface) of the leak-proof sheet 21 with the exterior sheet 25. Various nonwoven fabrics can be used as the exterior sheet 25. As a raw material fiber constituting this nonwoven fabric, synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester and amide, recycled fibers such as rayon and cupra, and natural fibers such as cotton can be used.

  At the both ends in the width direction of the absorbent pad 200, the exterior sheet 25 extends outward from the side edge of the absorbent body 23, and the extended part is folded from the back side of the absorbent pad 200 to the use surface side. Then, the inner surface of the folded exterior sheet 25 is bonded to the surface of the top sheet 22. This bonding can be performed by a known means such as a hot melt adhesive, heat sealing, or ultrasonic sealing.

(Displacement stop)
Moreover, you may provide the slip stop part (not shown) which consists of an adhesive layer in the back surface of the absorption pad 200. FIG. A hook tape having a large number of hook-shaped protrusions can also be used as the misalignment stopper. The hook-shaped projections include mushrooms, hooks, les, Js, Ts, double Js (Js that are joined back to back), etc. However, any shape is acceptable. The hook tape can be attached with a hot melt adhesive or the like. It is desirable that the misalignment-preventing portion is coated so as to be peelable by a release sheet, and the release-preventing portion is exposed by peeling the release sheet during use.

(End flap)
In addition, at both ends in the front-rear direction of the absorbent pad 200, the exterior sheet 25, the leak-proof sheet 21, and the surface sheet 22 are respectively attached to the front and rear ends of the absorber 23 so as to extend to the front and rear sides. A non-end flap portion EF is formed. This bonding can also be performed by a known means such as a hot melt adhesive, heat sealing, or ultrasonic sealing. And absorber intervening parts other than these end flap parts EF constitute main part BD holding excrement.

(Three-dimensional gather)
The gather sheet 24 constituting the three-dimensional gather is bonded and fixed to the use surface of the absorbent pad 200 (in the illustrated form, the surface of the top sheet 22 and the outer surface of the exterior sheet 25) with the widthwise outer portion extending over the entire front-rear direction. The At the same time, the center portion in the width direction is bonded and fixed to the use surface of the absorbent article (in the illustrated embodiment, the surface of the topsheet 22) at both ends in the front-rear direction, and between both ends in the front-rear direction. It is not fixed to the use surface of the absorbent article. When the high-rigidity portion 29 is provided, the standing base end of the three-dimensional gather 26 becomes the high-rigidity portion 29. Further, when only the intermediate elastic member 30 is provided without providing the high-rigidity portion 29, the standing base end of the three-dimensional gather 26 becomes the recess portion 27.

  As a material for the gather sheet 24, a plastic sheet or a melt-blown nonwoven fabric can be used. However, in terms of touch to the skin, a nonwoven fabric that is water-repellent treated with silicon or the like is preferably used.

  And the elastic elastic member 31 is being fixed to the side edge part of the gather sheet 24 by the hot-melt-adhesive agent etc. in the expansion | extension state along the front-back direction. As this elastic elastic member 31, styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, polyester, etc. formed in a thread shape, a string shape, a belt shape, etc. Commonly used materials can be used.

(Recessed part)
In the front-rear direction center portion C1 (hereinafter referred to as “groin portion”) of the absorbent body 23, a recessed portion 27 that is recessed from the outer side in the width direction toward the center side is provided. By providing such a recess 27 in the absorbent body 23, when the wearer wears the absorbent body 23, it is possible to reduce the stiffness at the crotch portion. Moreover, since the amount of crushing of the absorbent body 23 in the crotch part is reduced by the wearer's leg pressure as compared with a product not provided with the hollow part 27, the effect of preventing excrement leakage can be enhanced.

  Moreover, the shape of this hollow part 27 can be made into arbitrary shapes, such as arc shape and trapezoid shape, as illustrated in FIG. In addition, in order to increase the contact area of a wearer's thigh and the absorber 23 and to improve the touch, it is preferable to make it arc shape along the curve of the skin of a thigh.

(Easily flexible part)
The region surrounded by the extended imaginary line on the side edge of the absorber 23 and the depression 27 is softer and more flexible than the region where the absorber 23 exists because the absorber 23 does not exist. Therefore, the easy bending part 28 which bends easily is formed. The easy-flexing portion 28 is configured by a top sheet 22 and a sheet on the back side of the top sheet 22. The sheet on the back side includes, for example, the leak-proof sheet 21 and the exterior sheet 25, and does not include the absorber 23. The easy-bending portion 28 is configured to rise in conjunction with the three-dimensional gather 26 standing up.

(High rigidity part)
In the present invention, by applying heat embossing or the like along the depression 27 or at a position close to the outside of the depression 27 (preferably along the depression 27), A high-rigidity portion 29 in which the rigidity of the hollow portion 27 is increased is formed. The shape of the high-rigidity portion 29 can be an arbitrary shape such as an arc shape or a trapezoidal shape as illustrated in FIG. In addition, although it is desirable that the shape of the hollow part 27 and the shape of the highly rigid part 29 correspond, it does not necessarily need to correspond. For example, even when the shape of the hollow portion 27 is a trapezoidal shape, the shape of the high-rigidity portion 29 is changed to the curvature of the skin of the thigh in consideration of improving the feel of the wearer on the thigh. It is preferable to make it an arc shape along.

  The high-rigidity portion 29 can be formed by applying heat sealing, ultrasonic waves, heat embossing, or the like to the top sheet 22 and the back sheet. In particular, it is preferably formed by ultrasonic waves because the production speed is high and the rigidity does not become too strong. In addition, when forming this highly rigid part 29, it is preferable to form a hollow from the surface sheet 22 toward the sheet | seat of the back surface side. Therefore, when forming the highly rigid part 29 using heat embossing, for example, it is preferable to push in the convex part of a manufacturing roll only from the use surface side, or to push in from both the use surface side and the back surface side.

  By forming the high-rigidity portion 29 in this way, when the elastic elastic member 31 of the three-dimensional gather 26 contracts, the high-rigidity portion 29 can be a starting point and the easy-flexible portion 28 can be raised. As a result, since the height at which the three-dimensional gather 26 rises becomes high, the close contact between the wearer's thigh and the three-dimensional gather 26 is strengthened, and side leakage of excrement can be prevented.

  The high-rigidity portion 29 is preferably formed at the boundary position between the easily deflectable portion 28 and the recessed portion 27 or in the vicinity of the outside of the recessed portion 27. When the highly rigid portion 29 is formed in the vicinity of the outside of the recessed portion 27, as shown in FIG. 15C, the distance N between the recessed portion 27 and the highly rigid portion 29 is 30 mm or less, more preferably 10 mm. In the following, it is more preferable that the thickness is 5 mm or less. In addition, the distance between the hollow portion 27 and the high-rigidity portion 29 may vary depending on the location. In the example of FIG. 15C, the length of N1 is longer than the length of N2. When there is such a difference in distance, regardless of whether the length of N2 is longer or shorter than the length of N1, the length N1 is considered based on the length N1 on the center side in the front-rear direction of the recess 27. Is preferably 30 mm or less, more preferably 10 mm or less, and even more preferably 5 mm or less. If the distance N between the hollow portion 27 and the high-rigidity portion 29 is longer than 30 mm, the solid gather 26 cannot be raised from the hollow portion 27, and there is a disadvantage that the rising height of the solid gather 26 is reduced. .

(Intermediate elastic elastic member)
The intermediate elastic stretchable member 30 can be fixed to the standing end side of the three-dimensional gather sheet. The intermediate elastic stretchable member 30 preferably has substantially the same length in the front-rear direction and a fixed position as the easily deflectable portion 28. Specifically, the difference M between the length in the front-rear direction of the intermediate elastic stretchable member 30 and the length in the front-rear direction of the easily deflectable portion 28 is within a range of difference of 30 mm or less, more preferably within a range of 10 mm or less, Preferably, it is within a range of 5 mm or less. In addition, the length difference M in the front-rear direction may vary depending on the location. In the example of FIG. 15B, the length of M2 is longer than the length of M1. When there is such a difference in distance, it is preferable that the length of M2 be 30 mm or less, more preferably 10 mm or less, and even more preferably 5 mm or less, considering M2 having a large difference as a reference. When the length difference M in the front-rear direction is longer than 30 mm, the intermediate elastic elastic member 30 interferes with the action of raising the three-dimensional gather 26 from the recess 27, and the height at which the three-dimensional gather 26 rises is reduced. There is a disadvantage.

  Moreover, it is preferable to fix the both ends of the intermediate elastic expansion-contraction member 30 to the position of the front end and the rear end of the easily-flexible part 28, or its vicinity, and to fix in the form which swells to the center side in the front-back direction and the width direction outside. Moreover, the shape which fixes this intermediate elastic expansion-contraction member 30 can be made into arbitrary shapes, such as arc shape and trapezoid shape, as illustrated in FIG. In addition, since the raw material of this intermediate elastic expansion / contraction member 30, the adhesive agent for fixing, and the like are the same as those of the elastic expansion / contraction member 31, description thereof is omitted here.

  Thus, the intermediate elastic elastic member 30 is provided, and when the intermediate elastic elastic member 30 contracts, the easy-flexible portion 28 is easily raised. As a result, since the height at which the three-dimensional gather 26 rises becomes high, the close contact between the wearer's thigh and the three-dimensional gather 26 is strengthened, and side leakage of excrement can be prevented.

  Further, when the absorbent pad 200 is worn, the absorbent body 23 is curved. Therefore, the intermediate elastic elastic member 30 that is curved and fixed at the time of manufacture contracts when worn and becomes linear.

  Further, when the intermediate elastic expansion / contraction member 30 is disposed along the hollow portion 27 or in parallel with the front / rear direction of the absorber 23, the intermediate elastic expansion / contraction member 30 is contracted by the absorber 23. Wrinkles enter and the crotch becomes stiff, and excrement leaks easily. Therefore, as in the present invention, fixing the intermediate elastic expansion / contraction member 30 in a form that swells to the center in the front-rear direction and to the outside in the width direction can prevent wrinkles from entering the absorbent body 23.

(Modification)
In the above description, an example is shown in which one high-rigidity portion 29 and one intermediate elastic stretchable member 30 are provided on each side of the absorbent pad 200. However, the present invention is not limited to this. May be.

  In the above description, an example in which the high-rigidity portion 29 and the intermediate elastic stretchable member 30 are provided in the absorbent pad 200 has been shown. However, they may be provided in a tape-type paper diaper or a pants-type paper diaper.

DESCRIPTION OF SYMBOLS 12A ... Side seal part, 15, 19 ... Waist middle part elastic elastic member, 16, 18 ... Waist lower part elastic elastic member, 17 ... Waist upper part elastic elastic member, 21 ... Leak-proof sheet, 22 ... Surface sheet, 23 ... Absorption Body, 24 ... Gather sheet, 25 ... Exterior sheet, 26 ... Solid gather, 27 ... Indented part, 28 ... Easily flexible part, 29 ... Highly rigid part, 30 ... Intermediate elastic stretch member, 31 ... Elastic stretch 32, elastic elastic member of 32 (planar gather), 33 ... target tape, 34 ... crepe paper, 35 ... fastening tape, 36 ... hook-and-loop fastener, 37 ... joint part, 40 ... intermediate sheet, 58 ... packaging sheet, 67 ... Front-rear fixing part, 200 ... absorbing pad, 300 ... pants-type paper diaper, 400 ... tape-type paper diaper, L1 (full length of absorbent article), W1 (absorbent) ) Full width, F1 (front-rear direction) ventral part, C1 (front-rear direction) center part, B1 (front-rear direction) dorsal part, x ... joint part, T ... waist edge, U ... waist lower part, W ... waist edge, EF ... end flap, SF ... side flap

Claims (3)

Including a top sheet that contacts the skin of the wearer, a bodily fluid absorber provided on the back side of the top sheet, and a leak-proof sheet that prevents transition of the bodily fluid provided on the back side of the absorber,
On both sides in the width direction, elastic stretch members are provided along the front-rear direction at least on the side edges, and have a three-dimensional gather that stands on the use surface side due to the contraction force of the elastic stretch members when used.
On both sides of the absorbent body in the front-rear direction intermediate portion, a recess portion recessed toward the center in the width direction is provided, and at least in the region surrounded by the recess portion, the top sheet and the back side sheet material are used. Formed, and more flexible than the absorbent body, the easy deflection portion is configured to be interlocked with the standing of the three-dimensional gather,
The hollow portion or the vicinity of the outside of the hollow portion is formed with higher rigidity than other portions of the easily-flexible portion,
On the standing base side of the three-dimensional gather sheet, an intermediate elastic expansion / contraction member is fixed in the longitudinal range substantially the same as the flexible portion,
The intermediate elastic elastic member is a form that bulges outward in the width direction in a plan view in a state where the three-dimensional gather is expanded outward in the width direction,
The intermediate elastic elastic member is fixed to the three-dimensional gather overlapping the same position as the easy-flexible part in a plan view in a state where the three-dimensional gather is tilted inward in the width direction. Sex goods.   The absorbent article having a three-dimensional gather according to claim 1, wherein the high-rigidity portion is formed by any means selected from the group consisting of heat sealing, ultrasonic waves, and heat embossing.   The absorbent article having a three-dimensional gather according to claim 1 or 2, wherein the absorbent article is an absorbent pad, a tape-type paper diaper, or a pants-type paper diaper that is disposed on the use surface side of a lower body underwear or a paper diaper.

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