JP5072557B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent sheet.

  In general, as an absorbent body used for absorbent articles, an absorbent polymer that is uniformly distributed in pulp fibers and fixed with hot melt or the like is used. In order to reduce uneven distribution of the absorbent polymer as much as possible and effectively use the absorbent capacity of the absorbent polymer, the absorbent body includes an absorbent polymer held between a pair of carrier sheets, and the pair of carrier sheets are fixed to each other. Patent Document 1 discloses a technique of an absorbent body in which a region and a plurality of unfixed regions (pockets) are provided, and an absorbent polymer is disposed in these unfixed regions (pockets).

JP 9-504207 A

  However, when a disposable diaper having an absorbent body in which an absorbent polymer is uniformly distributed in pulp fibers or a disposable diaper having an absorbent body described in Patent Document 1 is used as, for example, a diaper for nursing care, the body is tilted for nursing care. Abundant polymer was wasted to caregivers.

  Therefore, the object of the present invention is that the absorbent polymer can move freely from one end to the other in the width direction of the diaper with the movement of the wearer's body, and can efficiently utilize the provided absorbent polymer. An object of the present invention is to provide an absorbent sheet particularly suitable for absorbent articles.

  The present invention is an absorbent sheet having an upper surface sheet, a lower surface sheet, and an absorbent polymer therebetween, a joined portion joining the upper surface sheet and the lower surface sheet, and a non-joined portion surrounded by the joined portion. According to the invention, the object is achieved by providing an absorbent sheet having a pocket having a major axis direction and a minor axis direction in plan view, and wherein the absorbent polymer is arranged to be movable in the major axis direction of the pocket. Is.

  According to the absorbent sheet of the present invention, the absorbent polymer can move freely from one end to the other end in the width direction of the diaper as the wearer moves, and the absorbent polymer provided in the absorbent sheet is efficiently utilized. be able to.

  Hereinafter, one preferred embodiment of the surface material of the absorbent article of the present invention will be described with reference to FIGS. In each figure, the same numerals indicate the same or equivalent components.

1 is a plan perspective view of the absorbent sheet 1 of the present embodiment, FIG. 2 is a cross-sectional view taken along the line XX of the absorbent sheet 1, and FIG. 3 is a cross-sectional view taken along the line YY of the absorbent sheet 1.
As shown in FIGS. 1 to 3, the absorbent sheet 1 of the present embodiment includes an upper sheet 2, a lower sheet 3, and an absorbent polymer 4 held between the two sheets 2 and 3. It is used. Furthermore, the absorbent sheet 1 of the present embodiment has the absorbent polymer 4 in the pocket 6 formed by the non-joined portion surrounded by the joint portion 5 that joins the top sheet 2 and the bottom sheet 3 to the absorbent sheet 1. It is accommodated so as to be movable in the width direction. The pocket 6 is formed in a rectangular shape having a major axis direction and a minor axis direction in plan view.

  As shown in FIG. 1, the absorbent sheet 1 of the present embodiment has a substantially vertically long rectangular shape as a whole, and the absorbent sheet 1 is a top sheet made up of a substantially vertically long rectangular sheet. 2 and a lower surface sheet 3 made of a single rectangular sheet having the same shape and the same size as the upper surface sheet 2.

The length L of the absorbent sheet 1 of the present embodiment is preferably 110 mm to 540 mm, and the width W is preferably 30 mm to 260 mm.
As shown in FIG. 1, the pocket 6 of the absorbent sheet 1 according to the present embodiment is formed so that its periphery is surrounded by a joining portion 5 that joins the top sheet 2 and the bottom sheet 3. The pocket 6 is formed in a rectangular shape having a major axis direction and a minor axis direction in plan view. This rectangular shape is formed of a pair of short sides 6a and a pair of long sides 6b. As shown in FIG. 1, the pocket 6 has the short axis (short side) direction 6 a of the pocket 6 arranged in the longitudinal direction of the absorbent sheet 1, and the long axis (long side) direction 6 b of the pocket 6 is the width of the absorbent sheet 1. Arranged in the direction.

  As shown in FIG. 1, the pocket 6 has a pair of long sides 6b extending from the vicinity of one end in the width direction of the absorbent sheet 1 to the vicinity of the other end, and the length of the long side 6b. The length W1 is preferably 50 to 90%, particularly 60 to 85% of the width W of the absorbent sheet 1, and the length L1 of the pair of short sides 6a of the pocket 6 is: Each of the lengths in the range of 5% to 30%, particularly 7 to 25% of the length L of the absorbent sheet 1 makes it easier for the absorbent polymer to move intensively in the width direction of the absorbent sheet. Therefore, it is preferable.

  As shown in FIG. 1 and FIG. 2, the joint portion 5 that joins the upper surface sheet 2 and the lower surface sheet 3 of the present embodiment is a joint portion 5 a that is located at each side end in the longitudinal direction of the absorbent sheet 1. As shown in FIG. 1, there are provided joint portions 5 b located at both longitudinal ends of the absorbent sheet 1 and joint portions 5 c located between adjacent pockets 6.

  The width W2 (see FIG. 2) of the joint portion 5a of the absorbent sheet 1 of the present embodiment is preferably 3 to 30 mm, particularly 3 to 15 mm. Further, the width W3 (see FIG. 3) of the joint portions 5b and 5c of the absorbent sheet 1 of the present embodiment is in the range of 0.5% to 15% with respect to the length L of the absorbent sheet 1. It is preferable because it has excellent absorption performance and is easy to seal and has excellent workability.

The number of pockets 6 of the absorbent sheet 1 of the present embodiment is preferably 1 to 10, and preferably 3 to 8. By carrying out like this, an absorption polymer tends to move preferentially to the width direction of the absorption sheet 1, and it is excellent in absorption performance.
Hereinafter, the absorbent sheet 1 of the present embodiment having five pockets 6 will be specifically described with reference to the drawings.
As shown in FIG. 1, five pockets 6 of the absorbent sheet 1 of the present embodiment are formed at equal intervals in the longitudinal direction of the absorbent sheet 1. These five pockets are all the same shape and size.

The absorbent polymer 4 of the present embodiment is accommodated so as to be movable in the major axis direction (width direction of the absorbent sheet 1) of each pocket 6, and the shape of the absorbent polymer 4 is various such as granular, needle-shaped, on a plate, etc. The shape is possible, but it is preferably granular so that it can be easily moved in the pocket 6. The average particle size of the absorbent polymer 4, as no intervening filler or between films of the fibers constituting the upper sheet 2 and lower sheet 3, 200Myuemu～500myuemu, it is preferable that particularly 220～450Myu m .
In addition, the average particle diameter of the absorption polymer 4 was measured as follows.

<Measurement method of average particle diameter of absorbent polymer>
Standard sieves defined by JIS Z 8801 having openings of 850 μm, 500 μm, 355 μm, 250 μm, 180 μm, 106 μm, and 45 μm are stacked in this order from the top, and the tray is stacked at the bottom. Here, 10 g of the absorbing polymer is placed on the top sieve, and a standard sieve is shaken using a shaker (for example, AS200 type manufactured by Lecce) with a shaking condition of 50 Hz, an amplitude of 0.5 mm, and a shaking time of 10 minutes. . The mass of the absorbent polymer remaining on each sieve was calculated as a percentage by mass with respect to the total mass of absorbent polymer (10 g). A plurality of integrated values were obtained by integrating each mass percentage in order from the smallest particle size. Each integrated value corresponding to each sieve opening was plotted on a logarithmic probability graph, and the particle diameter corresponding to 50% in terms of integrated weight percentage was taken as the average particle diameter.

As shown in FIGS. 1 and 3, the amount of the absorbent polymer 4 accommodated in each pocket 6 of the present embodiment is the absorption accommodated in the pocket 6 located at the center in the longitudinal direction of the absorbent sheet 1. The amount of the polymer 4 is accommodated more than the amount accommodated in the other four pockets 6, and is preferably 5 to 50 g / m ² . In addition, as shown in FIGS. 1 and 3, the amount of the absorbent polymer 4 accommodated in the pocket 6 as it goes from the pocket 6 located in the center in the longitudinal direction of the absorbent sheet 1 toward the longitudinal direction of the absorbent sheet 1 is increased. It is formed to gradually decrease.

  In the pocket 6 of the absorbent sheet 1 of the present embodiment, as shown in FIGS. The first support members 7a are provided. These first support members 7 a are provided in any of the five pockets 6. As shown in FIG. 2, the first support member 7 a makes it easy to form and maintain a space between the top sheet 2 and the bottom sheet 3. Therefore, the absorbent polymer 4 accommodated in the pocket 6 is more easily moved freely from one end to the other end in the width direction of the absorbent sheet 1.

  The pair of first support members 7a provided in the pocket 6 of the present embodiment has a rectangular shape in plan view as shown in FIG. 1 and has a substantially circular cross-sectional shape as shown in FIG. What is a thing is preferable. Further, the thickness of the first support member 7a is preferably 3 to 10 mm from the balance between the ease of movement of the absorbent polymer and the feeling of wearing. Examples of the material of the first support member 7a include pulp fibers (sheets), urethane foam, flat rubber made of synthetic rubber, natural rubber, and the like.

As shown in FIGS. 1 and 3, the pocket 6 of the present embodiment has a pair of second supports on the inner portion of the pocket 6 along the pair of long axis directions (long side 6 b in the present embodiment). Each member 7b is further provided. These second support members 7 b are provided in any of the five pockets 6. Similar to the first support member 7a, the second support member 7b facilitates the formation and maintenance of a space between the top sheet 2 and the bottom sheet 3, and facilitates the movement of the absorbent polymer 4 freely. Is for. The shape, thickness, and material of the second support member 7b are the same as those of the first support member 7a.
Note that the first support member 7a and the second support member 7b of the present embodiment are fixed between the top sheet 2 and the bottom sheet 3 with an adhesive, ultrasonic embossing, or the like.

  The top sheet 2 of the absorbent sheet 1 of the present embodiment is a liquid permeable sheet. Moreover, the upper surface sheet 2 of the absorbent sheet 1 of the present embodiment can use various known nonwoven fabrics and films used for absorbent articles as long as the stored absorbent polymer 4 does not leak. For example, a spunbond nonwoven fabric, a melt blown nonwoven fabric, a resin film such as PE, PP, or the like can be used. From the viewpoint of preventing polymer leakage and touch, a melt blown nonwoven fabric is particularly preferably used.

  The lower surface sheet 3 of the absorbent sheet 1 of the present embodiment may be either a liquid permeable or liquid impermeable sheet. Similarly to the upper surface sheet 2, various known types can be used as long as the stored absorbent polymer 4 does not leak. Nonwoven fabrics and films can be used.

The frictional resistance values on the surfaces of the upper surface sheet 2 and the lower surface sheet 3 of the present embodiment are preferably 0.5 μm or less, particularly 0.3 μm or less, because the absorbing polymer can easily move.
The frictional resistance value on the sheet surface can be measured, for example, with a static friction coefficient measuring machine (HEIDON STATIC FRICTION TESTER HEIDON-10: manufactured by Shinto Chemical Co., Ltd.).

  As the absorbent polymer 4 accommodated in the pocket 6 of the present embodiment, various known absorbent polymers used for absorbent articles can be used. For example, poly (sodium acrylate), (acrylic acid-vinyl alcohol) copolymer, cross-linked poly (sodium acrylate), (starch-acrylic acid) graft polymer, (isobutylene-maleic anhydride) copolymer and saponified product thereof, Examples include potassium polyacrylate and cesium polyacrylate.

  As a joining method of the joining portions 5a and 5b for joining the top sheet 2 and the bottom sheet 3 of the present embodiment, any known joining method can be used. For example, ultrasonic embossing, heat embossing, adhesive, or the like can be used. In particular, ultrasonic embossing is preferable as a method for joining the joint portions 5a and 5b of the present embodiment.

  As shown in FIG. 1, the absorbent sheet 1 according to the embodiment of the present invention described above has the absorbent polymer 4 stored in a pocket 6 surrounded by a joint portion 5 that joins the top sheet 2 and the bottom sheet 3. ing. Therefore, when the absorbent sheet 1 is tilted 90 ° in the right direction, all of the absorbent polymer 4 can move from one end to the other end in the width direction of the absorbent sheet 1 as shown in FIG.

Next, one use form and effect at the time of using the absorbent sheet 1 of one Embodiment of this invention mentioned above for an absorbent article (expandable disposable diaper) are demonstrated.
The absorbent article shown in FIGS. 5 and 6 includes a liquid-permeable top sheet 11, a liquid-impermeable back sheet 12, a liquid-retaining absorbent 13 interposed therebetween, and a fastening tape 14. This is a disposable diaper 10. The structure of such a disposable diaper is the same as that of a conventional product. As the top sheet 11, the back sheet 12, and the fastening tape 14, those used in a conventional disposable diaper can be used without particular limitation.

  In the disposable diaper 10 according to one embodiment of the present invention, the above-described absorbent sheet 1 according to one embodiment of the present invention is disposed between the top sheet 11 and the absorbent body 13 and is clamped and fixed. As shown in FIG. 5, the long axis (long side) 6 b direction of the pocket 6 of the absorbent sheet 1 is arranged in the width direction of the disposable diaper 10.

  The arrangement of the absorbent sheet in the unfolded disposable diaper 10 of the present embodiment will be described in detail. As shown in FIG. 5, the crotch part of the disposable diaper 10 and the pocket 6 located at the center in the longitudinal direction of the absorbent sheet 1 Are arranged to match.

  Although the absorber 13 of the disposable diaper 10 of one embodiment of the present invention can be used without particular limitation, those used in conventional disposable diapers and the like, the disposable diaper 10 includes the absorbent sheet 1. The amount of the absorption polymer contained in the absorber 13 may be small.

  According to the disposable diaper 10 of this embodiment mentioned above, the absorption polymer 4 can move freely over the other end from the width direction of the disposable diaper 10 with a motion of a wearer's body. Therefore, for example, when the orientation of the caregiver's body is periodically changed to prevent bed slipping, the absorbent polymer 4 can be distributed in the direction in which the body fluid such as urine flows along with the change in the orientation of the body. The obtained absorption polymer 4 can be utilized efficiently. In addition, the absorbent sheet 1 used in the disposable diaper 10 of the present embodiment contains a large amount of the absorbent polymer 4 in the pocket 6 located in the central portion of the absorbent sheet 1 in the longitudinal direction, and the absorbent sheet 1 Since the pocket 6 located in the center part in the longitudinal direction of the disposable diaper 10 and the crotch part of the disposable diaper 10 are arranged so as to coincide with each other, it is possible to prevent body fluid from leaking sideways.

Next, the other usage pattern which used the absorbent sheet 1 of one Embodiment of this invention mentioned above for the absorbent article (expandable disposable diaper) is demonstrated.
The deployment-type disposable diaper 10 ′ described in FIGS. 7 and 8 is different from the disposable diaper 10 illustrated in FIGS. 5 and 6 in the arrangement position of the absorbent sheet 1. As shown in FIG. 8, the deployable disposable diaper 10 ′ of the present embodiment has the absorbent sheet 1 disposed on the surface of the top sheet 11 on the wearer side. Moreover, as shown in FIG. 7, the long side 6b direction of the pocket 6 of the absorption sheet 1 is distribute | arranged to the width direction of disposable diaper 10 '.

  Disposable diaper 10 'of this embodiment has the adhering part 15 by an adhesive tape etc., in order to fix the absorption sheet 1 of one Embodiment of this invention on the surface by the side of the wearer of the surface sheet 11 temporarily. Yes.

  The disposable diaper 10 ′ of this embodiment is a diaper that can replace only the absorbent sheet 1 like an absorbent pad. The disposable diaper 10 ′ is economical because only the absorbent sheet 1 after use can be peeled off from the top sheet 11 and the new absorbent sheet 1 can be rearranged on the wearer side of the top sheet 11. is there. Moreover, the disposable diaper 10 'of this embodiment can utilize the absorption polymer 4 provided similarly to the disposable diaper 10.

  The absorbent sheet of the present invention is not limited to the above-described embodiment, and can be appropriately changed.

  For example, in the embodiment of the absorbent sheet 1 described above, the shape of the pocket 6 is a rectangular shape having a major axis direction and a minor axis direction in plan view, but may be an elliptical shape having a major axis direction and a minor axis direction. . Further, the lengths of the short axis and the long axis may be the same.

  In the above-described embodiment of the absorbent sheet 1, the upper sheet 2 and the lower sheet 3 of the absorbent sheet 1 have the same shape and the same size and are rectangular, but the upper sheet 2 and the lower sheet 3 of the absorbent sheet 1. May be the same shape and size as each other, and may be an hourglass shape. Also, it does not have to be the same shape and size.

  Further, in the embodiment of the absorbent sheet 1 described above, five pockets 6 having the same shape and the same size are formed at equal intervals. However, in order to prevent side leakage from the crotch, the absorbent sheet 1 The size of the pocket 6 located at the center in the longitudinal direction of the other may be larger than the sizes of the other pockets 6. The size of each pocket 6 can be changed as appropriate. Further, the interval between adjacent pockets 6 may be changed. Further, the number of pockets 6 does not have to be five, and may be at least one. When the number of pockets 6 is one, the pocket 6 is preferably arranged at the center in the longitudinal direction of the absorbent sheet 1, and the size thereof is the length W1 of the pair of long sides 6b of the pocket 6, The length L1 of the pair of short sides 6a is 15 mm to 100 mm.

  Moreover, the quantity of the absorption polymer 4 of the absorption sheet 1 of the said embodiment is more than the quantity accommodated in the pocket 6 located in the pocket 6 located in the center part of the longitudinal direction of the absorption sheet 1 from the other pocket 6 Although it is accommodated, when the absorbent sheet 1 is provided in a men's disposable diaper, the amount of the absorbent polymer 4 accommodated in the pocket 6 located in the front of the diaper is increased in accordance with the urination part of the wearer. Also good. Moreover, it is good also considering the quantity of the absorption polymer 4 accommodated in which pocket 6 as the same quantity.

  Moreover, although the pair 6 of the 1st support member 7a and the pair of 2nd support members 7b are each provided in the pocket 6 of the absorbent sheet 1 of the above-mentioned embodiment, any one pair of support members is provided. It should be. Also, any support member need not be provided. Each of the five pockets 6 of the absorbent sheet 1 of the above-described embodiment is provided with a pair of first support members 7a and a pair of second support members 7b, respectively. You may provide only in the pocket 6 located.

  Moreover, the absorbent article (expandable disposable diaper) using the absorption sheet of this invention is not restrict | limited to the above-mentioned embodiment at all, and can be changed suitably.

  For example, in the disposable diaper 10 of the above-described embodiment, the absorbent sheet 1 of the above-described embodiment of the present invention is arranged between the top sheet 11 and the absorbent body 13 and sandwiched and fixed. May be disposed between the absorbent body 13 and the back sheet 12 to be clamped and fixed.

  Moreover, in the disposable diaper 10 and 10 'of the above-mentioned embodiment, all were provided with the absorber 13, However, The form which is provided with only the absorption sheet 1 and is not provided with the absorber 13 may be sufficient.

  The absorbent sheet 1 of the present invention can be suitably used for absorbent articles such as a pants-type disposable diaper, a sanitary napkin, a panty liner, and an incontinence pad, in addition to the unfolded disposable diaper 10.

It is a top view of one embodiment of the absorption sheet of the present invention. It is XX sectional drawing of the absorption sheet of FIG. It is YY sectional drawing of the absorption sheet of FIG. It is a top view at the time of tilting the absorption sheet of FIG. 1 90 degrees rightward. It is a top view of one embodiment of a deployment type disposable diaper provided with the absorption sheet of Drawing 1. It is XX sectional drawing of the disposable diaper of FIG. It is a top view of other one embodiment of a deployment type disposable diaper provided with the absorption sheet of Drawing 1. It is XX sectional drawing of the disposable diaper of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Absorbing sheet 2 Upper surface sheet 3 Lower surface sheet 4 Absorbing polymer 5, 5a, 5b, 5c Joint part 6 Pocket (non-joint part)
6a short side, 6b long side 7a 1st support member, 7b 2nd support member 10, 10 'Unfoldable disposable diaper 11 Top sheet 12 Back sheet 13 Absorber 14 Fastening tape 15 Adhering part L Length of absorbent sheet, W Absorbing sheet width L1 Length of the short side of the pocket, W1 Length of the long side of the pocket W2 Width of the joint portion 5a, W3 Width of the joint portion 5b

Claims (4)

An absorbent article comprising a top sheet, a bottom sheet and an absorbent sheet having an absorbent polymer therebetween, a liquid-permeable top sheet and a liquid-impermeable back sheet,
The absorbent sheet has a joining portion for joining the top sheet and the bottom sheet;
A pocket having a shape having a major axis direction and a minor axis direction in a plan view by a non-joining part surrounded by the joining part at the periphery,
The absorbent sheet does not have another joint that divides the pocket in the pocket, and the absorbent polymer is arranged to be movable in the longitudinal direction of the pocket,
In the absorbent sheet, a plurality of the pockets are arranged at predetermined intervals along the longitudinal direction of the absorbent sheet,
The absorbent sheet is arranged such that the long axis direction of the pocket is oriented in the width direction of the absorbent article,
An absorbent article in which the absorbent polymer is movable from one end to the other end in the width direction of the absorbent article.   The absorptive article according to claim 1 which has a supporting member in a pair of long axis direction ends inside said pocket.   The amount of the absorbent polymer of the absorbent sheet is larger than the amount accommodated in the other pockets in the pocket located in the central portion in the longitudinal direction of the absorbent sheet, and the length of the absorbent sheet The absorbent article of Claim 1 or 2 arrange | positioned so that the said pocket located in the center part of a direction and the crotch part of the said absorbent article may correspond. An absorber is further provided between the top sheet and the back sheet, and the absorbent sheet is disposed between the top sheet and the absorber or between the absorber and the back sheet. The absorptive article according to any one of claims 1 to 3.

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