JP2009136601A - Absorbent article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an absorbent article with higher adhesiveness to a body and lower likelihood of leakage, which prevents a user from feeling discomfort while wearing. <P>SOLUTION: The absorbent article 1 comprises a longitudinally long absorber 2 with liquid retention, a first rear surface sheet 3 provided on a skin non-contacting surface side, and folding parts 9, 9 bent toward a skin contacting surface side to be a momentum for forming a longitudinally abutting front area 5A, central area 5C, and back area 5B. The second rear surface sheet 5 is provided on the skin non-contacting surface side of the first rear surface sheet 3. In the second rear surface sheet 5, its front area 5A and back area 5B are respectively fixed on the first rear surface sheet 3 so as to form fixing parts 35A, 35B. A spacing between the first rear surface sheet 3 and the second rear surface sheet 5 located between the fixing parts 35A and 35B form a non-joint part 35C without jointed each other. Elastic members 6, 6 are provided on a side of the first rear surface sheet 3 in a formed area of the non-joint part 35C with elongated so that its expansion direction could be identical to the longitudinal direction of the absorbent article 1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to absorbent articles such as incontinence pads and sanitary napkins.

  Absorbent articles such as incontinence pads and sanitary napkins are usually used by being fixed to the crotch part (crotch part) of underwear. In such an absorbent article, when an undergarment leaves | separates from a body resulting from a wearer's operation | movement etc., there existed a problem that this absorbent article will also separate from a body and a leak and discomfort will arise. In particular, when the underwear is loose that does not fit the body, such a problem becomes significant.

  Patent Document 1 discloses a technique in which a support device including a bottom sheet and a top sheet is arranged on the non-skin contact surface side of a body fluid absorbent article so that the body fluid absorbent article can follow the movement of the body. Is described. In this support, the bottom sheet is fixed along the inner surface of the crotch part of the underwear via a fastening means (adhesive zone) disposed in the center in the longitudinal direction of the sheet, and is curved in the longitudinal direction. The sheet extends in a flat state between both longitudinal ends of the bottom sheet and supports the body fluid absorbent article from the non-skin contact surface side, thereby lifting the body fluid absorbent article from the inner surface of the crotch part of the underwear. .

Patent Document 1 specifically discloses an embodiment in which means for bonding with an undergarment is provided in the central region in the longitudinal direction of the support. Absorbent articles of this form, when used fixed to the crotch part of the underwear, the front and rear regions move easily in accordance with the movement of the wearer's crotch part, etc. It is difficult to return to the original direction easily due to the inertial force applied to the absorbent article following the movement of. As a result, depending on the front and rear regions of the absorbent article, a gap may be formed between the body and the absorbent article and leakage may occur. Also, due to its form, when the body pressure is applied in the underwear direction, the bottom sheet has a certain degree of rigidity in order to ensure the adherence of the absorbent article to the body by stretching the top sheet. In fact, in Patent Document 1, only a highly rigid material such as thermoplastic is listed as the bottom sheet material. Due to this, the absorbent article described in Patent Document 1 may cause a sense of incongruity when worn.
Absorbent articles that have high adhesion to the body during wearing and are less likely to cause leakage or discomfort have not yet been provided.

JP 2002-204812 A

  Accordingly, an object of the present invention is to provide an absorbent article that has high adhesion to the body, is less likely to leak, and is less likely to cause discomfort during wearing.

  The present invention has a liquid-retaining absorbent body and a first back sheet disposed on the non-skin contact surface side, and is bent toward the skin contact surface side so that a front region along the longitudinal direction, the center A vertically long absorbent article having a bent portion serving as an opportunity to form a region and a rear region, wherein the second back sheet is disposed on the non-skin contact surface side of the first back sheet, and the second back sheet Each of the front and rear end portions in the longitudinal direction is fixed to the first back sheet to form a fixed part, and the first back sheet and the second back sheet positioned between these fixed parts are mutually A non-joined portion is formed without being joined, and the elastic member is in an extended state with its stretch direction aligned with the longitudinal direction of the absorbent article on the first back sheet side in the formation region of the non-joined portion. The front region on the non-skin contact surface side in the second back sheet and the rear Each region, by providing an absorbent article securing means for securing said absorbent article to the clothing are arranged, is obtained by achieving the above object.

  The absorbent article of the present invention has high adhesion to the body and is unlikely to leak, making it difficult to cause discomfort during wearing.

Hereinafter, the absorbent article of the present invention will be described with reference to the drawings based on an incontinence pad which is a preferred embodiment thereof.
As shown in FIGS. 1 to 3, the incontinence pad 1 of the present embodiment includes a vertically long absorbent body 2 having liquid retaining properties, and a first back sheet disposed on the non-skin contact surface side of the absorbent body 2. 3 and is formed substantially vertically long. As shown in FIG. 4, the incontinence pad 1 is bent toward the skin contact surface side, and a groove (folding portion) 9 is used as an opportunity to form a front region 5A, a central region 5C, and a rear region 5B along the longitudinal direction. have. Each of the front region 5A and the rear region 5B is easily bent to the skin contact surface side (surface sheet 4 side) of the incontinence pad 1 by the groove 9.
In the present specification, the skin contact surface is a surface directed toward the wearer's skin when the absorbent article is worn, and the non-skin contact surface is the underwear side (the wearer's skin side) when the absorbent article is worn. It is the surface that faces the other side.

In the present embodiment, a liquid-permeable top sheet 4 is disposed on the skin contact surface side of the absorbent body 2, and the absorbent body 2 is disposed between the top sheet 4 and the first back sheet 3. ing. The top sheet 4 forms a skin contact surface of the incontinence pad 1. The top sheet 4 covers the entire area of the absorbent body 2 on the skin contact surface side, and the first back sheet 3 covers the entire area of the absorbent body 2 on the non-skin contact surface side.
In the present specification, unless otherwise specified, the longitudinal direction is a direction along the long side of the vertically long incontinence pad 1, and the width direction is a direction orthogonal to the longitudinal direction.

The 1st back surface sheet 3 and the surface sheet 4 which has reached the non-skin contact surface side of the absorber 2 are joined by predetermined joining means such as an adhesive or heat seal. Further, the top sheet 4 and the first back sheet 3 extend outward from the longitudinal front and rear ends of the absorbent body 2, and are joined to each other by a predetermined joining means such as an adhesive or heat seal at the extending portions. Thus, an end seal portion is formed.
Moreover, between the surface sheet 4 and the absorber 2, and between the absorber 2 and the 1st back surface sheet 3 are each joined by predetermined joining means, such as a hot-melt-adhesive.

  A second back sheet 5 is arranged on the non-skin contact surface side of the first back sheet 3. The first back sheet 3 mainly plays a role of preventing leakage of the liquid to the outside of the pad, like the back sheet in this type of absorbent article, whereas the second back sheet 5 is mainly incontinence. It is used for positioning when the pad 1 is fixed to the clothes. Accordingly, the first back sheet 3 preferably has liquid impermeability or water repellency, whereas the second back sheet 5 does not need to have liquid impermeability or water repellency. Similar to the top sheet 4, it may have liquid permeability.

The second back sheet 5 is a sheet having a relatively high rigidity such as a bottom sheet described in Patent Document 1 (for example, a foamed sheet of thermoplastic plastic, a sheet made of an elastomer such as synthetic rubber, or a foamed elastomer). Sheet, thermoplastic injection molded product), and a flexible sheet having relatively low rigidity, such as a nonwoven fabric or a resin film, can be used. From the viewpoint of obtaining a good wearing feeling, it is preferable to use a non-woven fabric as the second back sheet 5. From the same viewpoint, the basis weight of the second back sheet 5 is preferably 10 to 50 g / m ² , more preferably 10 to 30 g / m ² .

The second back sheet 5 has substantially the same dimensions as the first back sheet 3 and is arranged on the non-skin contact surface of the first back sheet 3.
The dimension of the 2nd back surface sheet 5 can be suitably set according to the dimension of the underwear to which the dimension of an absorbent article or an absorbent article is fixed. For example, if the absorbent article is a female incontinence pad, the length in the longitudinal direction is generally 10 to 45 cm and the length in the width direction is 3 to 12 cm.

As shown in FIG. 3, the front and rear end portions of the second back sheet 5 are fixed to the first back sheet 3 to form fixed portions 35 </ b> A and 35 </ b> B. More specifically, on the surface sheet 4 side of the incontinence pad 1, a pair of linear grooves (bending portions) extending in the width direction are formed by integrally compacting the surface sheet 4 and the absorbent body 2. ) 9, 9 is formed, and the second back sheet 5 (incontinence pad 1) is a front region 5A that is disposed on the front side (abdominal side) of the pad wearer in the longitudinal direction by the pair of grooves 9, 9. A rear region 5B disposed on the rear side (back side) of the pad wearer, and a central region 5C sandwiched between these regions 5A and 5B (a pair of grooves 9, 9), and these front regions 5A and the rear region 5B are fixed to the first back sheet 3 to form fixing portions 35A and 35B. The fixing portions 35 </ b> A and 35 </ b> B in the present embodiment are formed by applying the hot melt adhesive over the entire width of each of the front region 5 </ b> A and the rear region 5 </ b> B in the second back sheet 5. Between the first back sheet 3 and the second back sheet 5 located between the fixing parts 35A and 35B (central region 5C), a non-joining part 35C is formed without being joined to each other over the entire width. ing. The non-joining portion 35 </ b> C in the present embodiment exists in the center portion in the longitudinal direction of the incontinence pad 1.
The lengths along the longitudinal direction of the front region 5A and the rear region 5B are 10 to 35%, preferably 15 to 35%, respectively, and most preferably the total length in the longitudinal direction of the absorbent article. 1/4 to 1/3.

The fixing portion 35A is formed in a region within 10 to 35%, particularly within 20 to 30% of the entire length in the longitudinal direction of the second back sheet 5 from the front end 5a in the longitudinal direction of the second back sheet 5 to the inside in the longitudinal direction. It is preferred that
Further, the fixing portion 35B is within 10 to 35%, particularly within 20 to 30% of the entire length in the longitudinal direction of the second back sheet 5 from the longitudinal rear end 5b of the second back sheet 5 inward in the longitudinal direction. It is preferable to be formed in the region.

The non-joining portion 35C is provided in the central region 5C of the incontinence pad 1. The center region 5 </ b> C is a region including an excretion portion facing portion (not shown) that faces the excretion site of the wearer when the incontinence pad 1 is worn. As described later, the formation region of the non-joint portion 35C in the incontinence pad 1 is lifted from the inner surface of the crotch part of the undergarment when the pad is worn, and is in close contact with the body.
More specifically, the non-joint portion 35C is provided at least from the virtual straight line (not shown) that bisects the incontinence pad 1 in the longitudinal direction to each of the front end 5a and the rear end 5b in the longitudinal direction of the second back sheet 5. It is preferable that the back sheet 5 is formed in a region within 30 to 80%, particularly 40 to 60% of the entire length in the longitudinal direction. In the present embodiment, the non-joining portion 35C exists from the central region 5C to a part of each of the front region 5A and the rear region 5B.

  On the first back sheet 3 side in the formation region of the non-joint portion 35C, the elastic member 6 is arranged in an extended state with its expansion / contraction direction coinciding with the longitudinal direction of the absorbent body 2. Here, the “first back sheet side” means that the elastic member 6 is disposed on the skin contact surface side (upper side) with respect to the boundary between the first back sheet 3 and the second back sheet 5, It means that it is not arranged on the second back sheet 5. In the present embodiment, as shown in FIGS. 1, 2, and 4, one elongated piece is provided at each of the left and right side edges in the longitudinal direction of the non-joint portion 35C on the non-skin contact surface side of the first back sheet 3. The belt-like elastic member 6 is joined by a known joining means such as an adhesive in an expanded state with its longitudinal direction coinciding with the longitudinal direction of the absorbent body 2, and the shrinkage rate is preferably 15 to 50%. The elastic member 6 may be disposed not only on the non-skin contact surface side of the first back sheet 3 but also on the skin contact surface side of the first back sheet 3, and is a separate member from the first back sheet 3. It may be fixed.

  The length in the longitudinal direction of the elastic member 6 is arranged to substantially coincide with the length in the longitudinal direction of the formation region of the non-joining portion 35C. The elastic member 6 may be disposed in the entire width direction of the formation region of the non-joint portion 35C. However, as shown in FIG. 1, the elastic member 6 is disposed only on the left and right side edges in the longitudinal direction of the formation region. Leakage from the water can be further prevented. Further, the number of the elastic members 6 is not limited to one for each of the left and right side edges, but may be a plurality.

  Further, a fixing means 7 for fixing the incontinence pad 1 to the clothing 50 is disposed in each of the front region 5A and the rear region 5B on the non-skin contact surface side in the second back sheet 5. In the present embodiment, as shown in FIG. 2, the front side region 5 </ b> A and the rear side region 5 </ b> B on the non-skin contact surface side of the second back sheet 5 are respectively viewed in plan view at the longitudinal center portion and the width direction center portion. The rectangular fixing means 7 is arranged with its longitudinal direction coinciding with the width direction of the absorber 2. The fixing means 7 is disposed in the formation region of each of the fixing portions 35A and 35B. The fixing means 7 is not disposed in the formation region of the non-joining portion 35C sandwiched between the fixing portions 35A and 35B. The fixing means 7 is formed by applying a hot melt adhesive to a predetermined part. The fixing means 7 is protected by a release sheet (not shown) when not in use.

  When the area of the fixing portion 35A (35B) is S1, and the area S2 of the fixing means 7 arranged in the formation region of the fixing portion 35A (35B), the ratio between S1 and S2 (S1 / S2) is preferably It is 0.3 to 1, more preferably 0.5 to 0.9.

  The incontinence pad 1 of the present embodiment is configured as described above, and therefore, when worn while being fixed to the inner surface 50a of the crotch part 50 of the underwear via the fixing means 7, as shown in FIG. Due to the contraction force of the elastic members 6 and 6, the elastic members 6 and 6 are bent concavely toward the skin contact surface side in the longitudinal direction. At this time, since the second back sheet 5 is joined to the crotch part 50 via the fixing means 7 and 7, the entire second back sheet 5 follows the crotch part 50. 4, in the formation region of the non-joint portion 35 </ b> C, as shown in FIG. 4, it floats from the skin contact surface of the second back sheet 5 together with the absorber 2 and the top sheet 4, and the first back sheet 3 in the formation region A space is formed between the second back sheet 5 and the second back sheet 5. Moreover, since the front region 5A and the rear region 5B of the incontinence pad 1 are fixed to the underwear, and both the regions 5A and 5B are stabilized by the grooves 9 functioning as bent portions, both the regions 5A and 5B are the central region. Since it functions as a support part of 5C (formation area of the non-joining part 35C) and the space is stabilized, a soft member such as a nonwoven fabric can be selected as the material of the second back sheet 5. The formation of the second back sheet 5 from a soft member leads to a good wearing feeling. In this way, the formation region of the non-joint portion 35C that is lifted from the inner surface 50a of the crotch portion 50 of the underwear can easily follow the movement of the pad wearer's body and can always be in close contact with the excretory portion facing portion. Therefore, the incontinence pad 1 according to the present embodiment having the above-described configuration has high adhesion to the body, and is less likely to cause leakage or discomfort.

The incontinence pad 1 of this embodiment will be described in more detail.
In the present embodiment, as shown in FIG. 1, in addition to the pair of grooves 9 and 9 functioning as the bent portions described above, the topsheet 4 and the absorber 2 are integrated on the topsheet 4 side of the incontinence pad 1. An oval closed groove 8 is formed which is formed by compaction. Each of the pair of grooves 9 and 9 is connected to the groove 8 and is curved to protrude outward in the longitudinal direction in plan view. Between the pair of grooves 9, the excretory part facing part is located.
By forming these grooves 8 and 9, the incontinence pad 1 can be easily deformed in accordance with the wearer's body shape when the incontinence pad 1 is worn, and the excreted liquid is in the longitudinal direction of the incontinence pad 1. Thus, liquid absorption can be efficiently performed using the entire absorber 2. The grooves 8 and 9 can be formed, for example, by squeezing the absorbent body 2 from the surface sheet 4 side using a known embossing device.

  As shown in FIG. 3, the absorbent body 2 has, in the central region 5 </ b> C, a middle-high portion 21 that protrudes toward the skin contact surface side from the front region 5 </ b> A and the rear region 5 </ b> B. The middle-high portion 21 is formed by increasing the thickness of the absorber 2 only in the central portion in the longitudinal direction. In the present embodiment, the middle-high portion 21 is formed in a region surrounded by the grooves 8 and 9 and includes the excretory portion facing portion. Moreover, the middle-high part 21 is formed in the formation area of the non-joining part 35C sandwiched between the fixing parts 35A and 35B, so that when the pad is worn, the inner surface 50a of the crotch part 50 of the underwear as shown in FIG. Floats up and comes into close contact with the excretory part facing part. Thus, by forming the middle-high part 21, the adhesion between the skin contact surface of the incontinence pad 1 and the excretory part-facing part at the time of wearing is further enhanced, and the absorbent body 2 can be worn at the time of wearing. It becomes difficult to get twisted. Moreover, since the front region 5A and the rear region 5B are easily bent toward the skin contact surface side by the middle and high portions 21 themselves without providing the grooves 9 as in the present embodiment, the thickness boundary portion is used as the bent portion 9. It can also be used.

  When the thickness of the middle-high portion 21 in the absorber 2 is T1, and the thickness of the portion other than the middle-high portion 21 (the portion having a smaller thickness than the middle-high portion 21) is T2, the ratio between T1 and T2 (T1 / T2) is preferably 1.5-6, more preferably 2-4.

The material for forming each part of the incontinence pad 1 will be described. As the absorbent body 2, the first back sheet 3, the top sheet 4, and the elastic member 6, those used in this type of conventional absorbent article are particularly used. Can be used without limitation.
As the absorbent body 2, for example, a fiber aggregate such as pulp fiber containing an absorbent polymer as necessary can be used. The absorbent body 2 may be coated with a cover sheet such as paper such as tissue paper or various non-woven fabrics. Moreover, as the 1st back surface sheet 3, for example, the resin film which does not have moisture permeability, the resin film which has micropores and moisture permeability, nonwoven fabrics, such as a water-repellent nonwoven fabric, or the composite sheet formed by bonding together these suitably Can be used. Moreover, as the surface sheet 4, various liquid-permeable sheet materials, such as a nonwoven fabric and an apertured film, can be used, for example. Moreover, as a constituent material of the elastic member 6, for example, an elastic material made of polyolefins, polyurethanes and copolymers thereof, natural rubber, or the like can be used.

As described above, the incontinence pad 1 of the present embodiment is worn in a state of being fixed to the inner surface 50a of the crotch part 50 of the underwear via the fixing means 7, thereby forming a non-joint portion 35C formation region (central region 5C). ) Floats up from the inner surface 50a (see FIG. 4), and the skin contact surface side of the formation region always comes into close contact with the wearer's excretory part facing part. For this reason, the incontinence pad 1 of this embodiment is excellent in followability with respect to the body, has high adhesion, and is less likely to cause leakage or discomfort.
Moreover, when the middle-high part 21 is formed in the absorber 2, while the adhesiveness of the skin contact surface of the incontinence pad 1 at the time of wear and the said excretion part opposing part is improved further, an absorber is used at the time of wear Since 2 becomes difficult to twist, the fit of the incontinence pad 1 to the body is further enhanced.

The absorbent article of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the elastic member 6 is disposed on the left and right side edges in the longitudinal direction of the formation region of the non-joint portion 35C, but may be disposed in the center in the width direction of the formation region. You may distribute | arrange substantially the whole area | region.
Moreover, in the said embodiment, although the elastic member 6 was distribute | arranged to the non-skin contact surface side of this 1st back surface sheet 3 between the 1st back surface sheet 3 and the 2nd back surface sheet 5, it is a non-joining part. What is necessary is just to be distribute | arranged to the formation area of 35C, and may be between the surface sheet 4 and the absorber 2, and may be between the absorber 2 and the 1st back surface sheet 3. As described above, the elastic member 6 is not disposed on the second back sheet 5.

Moreover, in the said embodiment, although the fixing means 7 was distribute | arranged only to the longitudinal direction front-and-rear end part (front side area | region 5A, rear side area | region 5B) of the non-skin contact surface side of the 2nd back surface sheet 5, In addition to the end portions, they may be arranged in a region (central region 5C) sandwiched between these front and rear end portions.
Moreover, although the fixing means 7 was the adhesive part formed by apply | coating an adhesive in the said embodiment, you may be formed from the male material etc. of the mechanical fastener.

Moreover, in the said embodiment, although the middle-high part 21 was formed by enlarging the thickness of the absorber 2 only in the longitudinal direction center part, it forms by laminating | stacking an upper layer absorber on a lower layer absorber. May be.
Moreover, in the said embodiment, although the incontinence pad was mentioned as one of the examples of application of the absorbent article of this invention, For example, it can apply also to a sanitary napkin, a panty liner, a cage sheet, etc.

FIG. 1 is a plan view showing a skin contact surface side (surface sheet side) of an incontinence pad that is an embodiment of the absorbent article of the present invention. FIG. 2 is a plan view showing the non-skin contact surface side (second back sheet side) of the incontinence pad shown in FIG. FIG. 3 is a longitudinal sectional view schematically showing a cross section taken along the line II of FIG. FIG. 4 is a view corresponding to FIG. 3 showing a use state of the incontinence pad shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Incontinence pad 2 Absorber 21 Middle-high part 3 1st back surface sheet 4 Top sheet 5 2nd back surface sheet 5A Front side area | region (longitudinal front end part of 2nd back surface sheet)
5a Longitudinal front end 5B of second back sheet Rear region (longitudinal rear end of second back sheet)
5b Longitudinal rear end 5C of second back sheet 6 Central region 6 Elastic member 7 Fixing means 8 Groove 9 Groove (folded portion)
35A, 35B Fixed part 35C Non-joint part 50 Underwear crotch part 50a Inner crotch inner surface (skin contact surface)

Claims (2)

A front region, a central region, and a rear region having a liquid-retaining absorbent body and a first back sheet disposed on the non-skin contact surface side, bent toward the skin contact surface side, and along the longitudinal direction A vertically long absorbent article having a bent portion that becomes an opportunity to form
A second back sheet is disposed on the non-skin contact surface side of the first back sheet, and the second back sheet is formed by fixing the front and rear end portions in the longitudinal direction to the first back sheet to form a fixed portion. And between the first back sheet and the second back sheet located between these fixed parts, is not joined to each other, forming a non-joined part,
On the first back sheet side in the formation region of the non-joining portion, an elastic member is arranged in an expanded state with its expansion / contraction direction coinciding with the longitudinal direction of the absorbent article,
An absorbent article in which fixing means for fixing the absorbent article to clothing is arranged in each of the front region and the rear region on the non-skin contact surface side of the second back sheet.   The absorptive article according to claim 1 in which said absorber has the middle high part projected in the skin contact surface side rather than said front field and said rear field in said central field.

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