JP4767337B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article that receives excrement from a wearer.

  Conventionally, as an absorbent article used for disposable diapers or the like, a main body provided with an absorbent core formed of pulverized pulp or the like between a liquid-permeable top sheet and a waterproof back sheet, and a main body What is provided with the three-dimensional gather which is attached to both sides and prevents leakage of urine etc. is used. In such an absorbent article, the three-dimensional gathering flexibly contacts the skin near the base of the wearer's foot to prevent the excrement from leaking, and the back sheet covering the outside of the absorbent article permeates the top sheet. It is possible to prevent excretion such as urine and water of excretion once absorbed by the absorption core from oozing out to the outside of the absorbent article.

As described above, the back sheet of the absorbent article is required to have high waterproof properties, but also has to be improved in breathability in order to prevent stuffiness and rash on the wearing portion, and the porous back sheet having breathability. Etc. are used. As such a back sheet, for example, an inorganic additive such as calcium carbonate (CaCO ₃ ) is mixed until the polyolefin resin is melted to about 30 to 60% by weight, extruded with a die, and further formed through a stretching process. Porous porous films are used.

  In addition, back sheets having different breathability for each part have been proposed. For example, Patent Literature 1 discloses a back sheet having a laminated structure in which a fiber material is provided in a portion facing an absorbent core in one air-permeable polymer film layer and a method for manufacturing the same. In the backsheet, the MVTR (Moisture Vapor Transmission Rate) value of the portion facing the absorbent core is made lower than that of the chassis backsheet material due to the structure described above, and the breathability of the backsheet is improved around the absorbent core, thereby absorbing the article. Improved air permeability.

Special table 2001-509420 gazette

  By the way, in patent document 1, although the improvement of the breathability of an absorbent article is examined paying attention to the breathability of a back sheet, and the position of an absorption core, the influence of a wearer's various posture is not examined. . In general, in order to prevent excrement from seeping out from the back sheet, that is, to improve the water pressure resistance, air permeability must be sacrificed to some extent. However, water pressure resistance and air permeability are not necessarily proportional, and the leaching of liquid from the backsheet depends on how much pressure is applied to the backsheet, so pay attention to the position of the absorbent core. Therefore, it is not possible to properly retain excrement in the absorbent article simply by distributing different air permeability. Therefore, it becomes difficult to efficiently prevent stuffiness of the wearing part facing the absorbent core and skin irritation during long-time wearing.

  This invention is made | formed in view of the said subject, and it aims at improving the air permeability of an absorbent article appropriately partially, preventing the leakage of the excrement from an absorbent article.

The invention according to claim 1 is an absorbent article that is attached from the wearer's belly side to the back side and receives excrement from the wearer inside the pants-type disposable diaper , the absorbent core, A top sheet that covers the main surface of the absorbent core on the wearer side and a back sheet that covers the other main surface of the absorbent core, the back sheet facing the buttocks of the wearer and a first water pressure resistance A rear portion having a value and a front portion facing the abdomen of the wearer, and a width of an intermediate portion between the front portion and the rear portion is smaller than a width of a front portion and a rear portion of the absorbent core , the center in the width direction of the front portion, the low water pressure portion position is provided with a second water pressure value lower than the first water pressure value, the width of the low water pressure part-position, of the front portion rather smaller than the width, part of the low water pressure portion position is, before Located on either side of the middle portion of the absorbent core.

The invention according to claim 2 is an absorbent article that is attached from the wearer's belly side to the back side and receives excrement from the wearer inside the pants-type disposable diaper , the absorbent core, A top sheet that covers the main surface of the absorbent core on the wearer side and a back sheet that covers the other main surface of the absorbent core, the back sheet facing the buttocks of the wearer and a first water pressure resistance A rear portion having a value and a front portion facing the abdomen of the wearer, and a width of an intermediate portion between the front portion and the rear portion is smaller than a width of a front portion and a rear portion of the absorbent core , Oite to the front portion, a plurality of low water pressure part position having a lower than the first water pressure value second water pressure value with each being in the form of a strip extending in the longitudinal direction, perpendicular to the longitudinal direction Arranged in the width direction, the plurality Some of the low water pressure part-position, you located on opposite sides of said intermediate portion of said absorbent core.

  Invention of Claim 3 is an absorbent article of Claim 1 or 2, Comprising: The said low water-pressure-resistant site | part is equipped with a water-repellent nonwoven fabric, and the said back part is equipped with a water-resistant film.

The invention according to claim 4, an absorbent article according to any of claims 1 to 3, water pressure resistance of the rear portion, to 400mmH 2 _O without a 700mmH 2 _O, the low water pressure part position The water pressure resistance is 100 mmH ₂ O to 200 mmH ₂ O.

  In the present invention, the air permeability of the absorbent article can be appropriately partially improved while preventing leakage of excreta from the absorbent article by using the water pressure resistance as a reference. In the invention of claim 3, the water pressure resistance can be easily changed between the low water pressure resistant portion and the rear portion.

It is a figure which shows the structure of a disposable diaper provided with the absorbent article which concerns on related technology. It is a bottom view of an absorptive article. It is sectional drawing of an absorbent article. It is a bottom view which shows the absorbent article which concerns on related technology. It is a bottom view which shows the absorbent article which concerns on related technology. It is a bottom view showing an example of an absorptive article concerning an embodiment of the invention. It is a bottom view showing an example of an absorptive article concerning an embodiment of the invention. It is a bottom view showing an example of an absorptive article concerning an embodiment of the invention.

FIG. 1 is a diagram illustrating an appearance of a pants-type disposable diaper 10 including an absorbent article 1 according to a technique related to the present invention. The absorbent article 1 is a so-called pad unit for receiving excrement from a wearer is provided toward the back side from the ventral side of the wearer, Ru attached to the relevant portions of the disposable diaper 10 as an independent component.

  FIG. 2 is a bottom view of the absorbent article 1 as viewed from the side opposite to the side facing the wearer (that is, the outside) in a state where the absorbent article 1 is stretched, and FIG. 3 shows the absorbent article 1 shown in FIG. It is sectional drawing cut | disconnected by the surface perpendicular | vertical to a Y direction. As shown in FIG. 2 and FIG. 3, the absorbent article 1 includes a substantially sheet-like main body portion 2 and a main body portion over almost the entire length in the longitudinal direction of the main body portion 2 (that is, the Y direction in FIG. 2). 2 is provided with a pair of side wall portions 3 provided on the (+ X) side and (−X) side. 2 and 3, the main surface on the side where the side wall 3 of the main body 2 is provided, that is, the (+ Z) -side main surface is a surface in contact with the wearer.

  As shown in FIG. 3, an elastic member 31 extending in the Y direction is joined to each of the pair of side wall portions 3, and in a state where the absorbent article 1 is expanded as shown in FIG. 2, the elastic member 31 is It is in an extended state. In addition, illustration of the elastic member 31 is abbreviate | omitted in FIG. Each side wall 3 may be provided with a plurality of elastic members 31. In the absorbent article 1, when the elastic member 31 shown in FIG. 3 contracts, the side wall portion 3 rises toward the wearer side on the side of the main body portion 2, and abuts on the vicinity of the base of the wearer's foot when worn. A three-dimensional gather (so-called leg gather) is formed. The side wall 3 is formed of a water-repellent or liquid-impervious nonwoven fabric (for example, a spunbond nonwoven fabric, a meltblown nonwoven fabric, an SMS (spunbond / meltblown / spunbond) nonwoven fabric), a plastic film, or a composite material thereof. . From the viewpoint of improving the comfort of the absorbent article 1, it is preferable that the side wall portion 3 has air permeability.

  As shown in FIGS. 2 and 3, the main body 2 includes a liquid-absorbing absorbent core 22, a top sheet 21 that covers the main surface of the absorbent core 22 on the wearer side (that is, the (+ Z) side), and an absorbent body. A back sheet 23 that covers the other main surface of the core 22 is provided, and the side wall 3 is joined to the side of the absorbent core 22. The top sheet 21 and the back sheet 23 are joined around the absorbent core 22 by a hot melt adhesive or the like.

  The top sheet 21 is a non-woven fabric formed of a liquid-permeable material, for example, a hydrophilic fiber, and captures moisture of excrement from the wearer and moves it to the absorbent core 22. Nonwoven fabrics used as the top sheet 21 are, for example, point bond nonwoven fabrics, air-through nonwoven fabrics, and spunlace nonwoven fabrics. As hydrophilic fibers forming these nonwoven fabrics, cellulose, rayon, cotton, or the like is usually used. As the top sheet 21, a liquid-permeable nonwoven fabric formed of hydrophobic fibers (for example, polypropylene, polyethylene, polyester, polyamide, nylon) whose surface is hydrophilically treated with a surfactant may be used. Alternatively, a plastic film having an aperture may be used.

  The absorbent core 22 shown by a thick broken line in FIG. 2 is obtained by mixing a hydrophilic fiber (for example, pulverized pulp fiber or cellulose fiber) with a granular water-absorbing polymer (for example, SAP (Super Absorbent Polymer)). It is formed by wrapping with tissue paper or a liquid-permeable sheet, and absorbs moisture that has passed through the top sheet 21 to quickly fix it. Tissue paper or the like that wraps hydrophilic fibers prevents the hydrophilic fibers from being deformed and the water-absorbing polymer from falling off.

  As shown in FIG. 2, the backsheet 23 has a rear part 231 facing the wearer's buttocks and a front part 232 (shown with a parallel diagonal line in FIG. 2) facing the wearer's abdomen. The moisture which permeate | transmitted the top sheet 21 and the water | moisture content once absorbed by the absorption core 22 are prevented from leaching out of the main-body part 2 (namely, (-Z) side).

The rear part 231 is formed of a water-resistant film having air permeability. The water pressure resistance of the rear portion 231 is 400 to 700 mmH ₂ O so that moisture does not ooze out from the backsheet 23 even when the wearer is sitting or lying down and takes a posture that puts weight on the buttocks. Is done. Further, the air permeability (according to the test method defined in JISP 8117), which is one index representing the air permeability, is preferably 60 minutes or less from the viewpoint of improving the air permeability of the rear portion 231.

The front portion 232 is a water repellent nonwoven fabric having a water pressure resistance lower than that of the rear portion 231 (for example, a spunbond nonwoven fabric, a melt blown nonwoven fabric, or an SMS nonwoven fabric, and further subjected to water repellency treatment as necessary. May also be formed). The water pressure resistance of the front portion 232 is set to 100 to 200 mmH ₂ O (more preferably 120 to 150 mmH ₂ O) so that moisture does not ooze out from the back sheet 23 due to clothing pressure when rising or standing up. Further, the air permeability according to JISP 8117 is preferably 60 seconds or less (more preferably 1 second or less) from the viewpoint of improving the air permeability of the front portion 232. It should be noted that the water pressure resistance value of the front portion 232 does not necessarily have to be the same value in all the portions of the front portion 232, and may have a different value for each portion within the above range. The same applies to the rear portion 231.

  In the absorbent article 1, the front portion 232 is a portion having a low water pressure resistance formed of a water-repellent nonwoven fabric (hereinafter referred to as “low water pressure portion”), and the rear portion 231 is formed of a water resistant film. It becomes a site | part (henceforth a "high water-pressure-resistant site | part") with high water pressure resistance. In this way, by changing the water pressure resistance value of the back sheet 23 for each part based on the required water pressure resistance, the breathability of the absorbent article 1 can be prevented while preventing the excrement from leaking from the absorbent article 1. Can be partially improved appropriately according to the required location. Further, in the sitting position or the supine position, the water pressure value of the rear part 231 where the weight of the wearer is mainly applied is increased, and the water pressure value of the front part 232 which is difficult to apply the weight is decreased to increase the air permeability. The air permeability of the front part 232 can be ensured while preventing the excrement from leaking from the property article 1. As a result, it is possible to improve the comfort of the absorbent article 1 by preventing stuffiness and rash at the wearing portion.

  Further, in the back sheet 23 of the absorbent article 1, the front portion 232 is formed of a water-repellent nonwoven fabric, and the rear portion 231 is formed of a water-resistant film, so that the front portion 232 and the rear portion 231 are waterproof. Can be easily changed. In the absorbent article 1, when there is a possibility that the smell of excrement leaks from the front part 232 having high air permeability, a deodorizing function may be given to the front part 232. For example, the front part 232 may be formed of a material having a deodorizing function.

  FIG. 4 is a bottom view showing an absorbent article 1a according to a technique related to the present invention. In the absorbent article 1a, a back sheet 23a having a different structure is provided instead of the back sheet 23 shown in FIG. Other configurations are the same as those in FIG. 2, and the same reference numerals are given in the following description.

As shown in FIG. 4, the back seat 23a includes a front part 232 and a rear part 231, and the front part 232 (shown with a parallel diagonal line on the (−Y) side in FIG. 4) is the same as FIG. Similarly, it is formed of a water repellent nonwoven fabric. The rear portion 231 includes a high water pressure resistant portion 234 formed of a water resistant film and a low water pressure resistant portion 235 formed of a water repellent nonwoven fabric similar to the front portion 232 ((+ Y) side in FIG. 4). Are shown with parallel diagonal lines. ). The low water pressure resistant portion 235 is provided at the center of the rearmost end portion of the rear portion 231, that is, at a portion where the wearer's weight is not so much in a sitting position or the like. In addition, as long as the low water pressure-resistant site | part 235 is located in the most back end part, you may leave | separate from the edge of the back end. The water pressure resistance of the low water pressure resistant portion 235 is 100 to 200 mmH ₂ O (more preferably 120 to 150 mmH ₂ O) as in the front portion 232, and the air permeability is 60 seconds or less (more preferably 1 second). The following). The water pressure resistance of the high water pressure resistant portion 234 is 400 to 700 mmH ₂ O, and the air permeability is 60 minutes or less.

  In the back seat 23a, the low water pressure resistant portion 235 is provided in the rear portion 231, so that the air permeability of the rear portion 231 can be ensured. Moreover, since the low water pressure-resistant part 235 faces the wearer's back dent and usually a large pressure does not act, leakage of excrement from the absorbent article 1a is caused in the same manner as the backsheet 23 shown in FIG. While preventing, the air permeability of the absorbent article 1a can be appropriately partially improved according to the required location. Furthermore, by forming the front part 232 with a water-repellent nonwoven fabric and forming the rear part 231 mainly with a water-resistant film, the water pressure resistance can be easily changed between the front part 232 and the rear part 231. it can.

  FIG. 5 is a bottom view showing an absorbent article 1b according to a technique related to the present invention. In the absorbent article 1b, a back sheet 23b having a different structure is provided instead of the back sheet 23 shown in FIG. Other configurations are the same as those in FIG. 2, and the same reference numerals are given in the following description.

  As shown in FIG. 5, the front portion 232 of the back sheet 23b (shown with a parallel diagonal line on the (−Y) side in FIG. 5) is water-repellent in the same manner as the back sheet 23 shown in FIG. It is formed of a nonwoven fabric. The rear portion 231 (shown by overlapping two parallel oblique lines on the (+ Y) side in FIG. 5) has a two-layer laminated structure formed of a water-resistant film and a water-repellent nonwoven fabric. The main surface of the water-resistant film opposite to the wearer side (that is, the (−Z) side) is covered with a portion continuous from the water-repellent nonwoven fabric forming the front portion 232. In other words, the back sheet 23b has a structure in which a water-resistant film is adhered to the inner surface on the rear portion 231 side with respect to the water-repellent nonwoven fabric having the same size as the absorbent article 1b. The water pressure resistance and air permeability of the front portion 232 and the rear portion 231 of the back seat 23b are set in the same range as the back seat 23 shown in FIG.

  In the back sheet 23b, by forming the outer side of the rear part 231 with a nonwoven fabric, the feel from the outer side of the absorbent article 1b can be made soft and the wearing feeling can be improved. Moreover, similarly to the back sheet 23 shown in FIG. 2, the air permeability of the absorbent article 1b can be partially improved according to the required location.

  The backsheet may have various structures other than the structure described above. For example, in the back sheet 23 a shown in FIG. 4, instead of forming the low water pressure resistant portion 235 independently of the front portion 232, the outer side of the water-resistant film of the rear portion 231 is formed from a water-repellent nonwoven fabric that forms the front portion 232. A structure in which the air permeability of the rear portion 231 is ensured can also be obtained by covering the rear end portion 231 with the continuous portion.

  6 to 8 are bottom views showing examples of the absorbent article according to the embodiment of the present invention. In the absorbent article 1c shown in FIG. 6, the low water pressure-resistant site | part 235 formed with a water-repellent nonwoven fabric is provided in the front part 232 of the back seat | sheet 23c. The width of the low water pressure resistant portion 235 in the X direction is made smaller than the width of the front portion 232, and other portions of the front portion 232 are formed of a water resistant film in the same manner as the rear portion 231. Note that the low water pressure resistant portion 235 does not necessarily need to be formed of a water-repellent nonwoven fabric. Good.

  In the absorbent article 1d shown in FIG. 7, the shape of the low water pressure resistant portion 235 included in the front portion 232 of the back sheet 23d is substantially circular. Further, in the absorbent article 1e shown in FIG. 8, a plurality of strip-shaped low water pressure resistant portions 235 extending in the longitudinal direction of the absorbent article 1e are provided in the front portion 232 of the back sheet 23e. As in these examples, the low water pressure resistant portion 235 is included in the front portion 232, and the rear portion 231 is formed of a water resistant film having high water pressure resistant performance (or at least the high water pressure resistant portion is the rear portion 231. By using the back sheet having a structure (included in the above), it is possible to appropriately realize prevention of leakage of excrement from the absorbent article and improvement of the air permeability of the front portion 232.

  In the absorbent article, the nonwoven fabric manufactured by various manufacturing methods such as the spunlace method, the needle punch method, the thermal bond method, the spunbond method, the chemical bond method, and the air-through method is used as the top sheet 21, the back sheet and the side wall portion 3. Can be used.

1,1a-1e Absorbent article 21 Top sheet 22 Absorbing core 23, 23a-23e Back sheet 231 Rear part 232 Front part 234 High water pressure resistant part 235 Low water pressure resistant part

Claims (4)

Inside the pants-type disposable diaper, the absorbent article is attached from the wearer's stomach side to the back side and receives excrement from the wearer,
An absorbent core;
A top sheet covering the main surface of the absorbent core on the wearer side;
A backsheet covering the other main surface of the absorbent core;
With
The backsheet is
A rear portion facing the wearer's buttocks and having a first water pressure resistance value;
A front portion facing the abdomen of the wearer;
With
The width of the intermediate part between the front part and the rear part is smaller than the width of the front part and the rear part of the absorbent core,
A low water pressure resistant portion having a second water pressure resistance lower than the first water pressure resistant value is provided at the center in the width direction of the front portion, and the width of the low water pressure resistant portion is the width of the front portion. rather smaller than, the absorbent article in which the part of the low water pressure part position, characterized in that positioned on opposite sides of said intermediate portion of said absorbent core. Inside the pants-type disposable diaper, the absorbent article is attached from the wearer's stomach side to the back side and receives excrement from the wearer,
An absorbent core;
A top sheet covering the main surface of the absorbent core on the wearer side;
A backsheet covering the other main surface of the absorbent core;
With
The backsheet is
A rear portion facing the wearer's buttocks and having a first water pressure resistance value;
A front portion facing the abdomen of the wearer;
With
The width of the intermediate part between the front part and the rear part is smaller than the width of the front part and the rear part of the absorbent core,
Oite to the front portion, each plurality of low water pressure part position having a second water pressure value lower than the first water pressure value as well as a strip extending in the longitudinal direction, the longitudinal direction perpendicular to the width are arranged in a direction, the absorbent article a portion of the plurality of low water pressure part-position, characterized that you located on opposite sides of said intermediate portion of said absorbent core. The absorbent article according to claim 1 or 2,
The absorbent article, wherein the low water pressure resistant portion includes a water repellent nonwoven fabric and the rear portion includes a water resistant film. The absorbent article according to any one of claims 1 to 3,
An absorptive article, wherein a water pressure resistance of the rear portion is 400 mmH ₂ O to 700 mmH ₂ O, and a water pressure resistance of the low water pressure resistant portion is 100 mmH ₂ O to 200 mmH ₂ O.

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