JP2008206997A - Absorbent article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an absorbent article which is excellent in deodorizing effect and dose not leak malodor of excreta externally. <P>SOLUTION: The absorbent article 1 has a liquid permeable surface sheet 21, a liquid impermeable leakproof sheet 22, and a liquid retainable absorbent body 10 and contains a porous deodorant. The porous deodorant has micropores so that the volume of micropores with a diameter of 20-200 Å is not lower than 0.2 mL/g in 1g of the porous deodorant, preferably not lower than 0.6 mL/g. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to an absorbent article such as a disposable diaper that has less excrement smell and excellent deodorizing effect.

Conventionally, absorbent articles such as disposable diapers have been proposed that have a deodorizing effect by using a deodorant such as zeolite or activated carbon so that the smell of excrement is not put out of the diaper. .
However, the absorbent articles having a deodorizing effect that have been proposed so far have not yet obtained a sufficient deodorizing effect, and there is a demand for the development of an absorbent article having a more excellent deodorizing effect.

  Therefore, the objective of this invention is providing the absorbent article which is excellent in the deodorizing effect and does not leak the smell of excrement outside.

  As a result of studying to solve the above-mentioned problems, the present inventors have found that the above object can be achieved by using a deodorant having a specific ratio of pores having a specific opening area.

  The present invention has been made based on the above knowledge, and comprises an absorbent article comprising a liquid-permeable surface sheet, a liquid-impermeable leak-proof sheet, and a liquid-retaining absorbent, and containing a porous deodorant. The porous deodorant has pores so that the volume of the pores having a pore diameter of 20 to 200 mm is 0.2 ml / g or more in 1 g of the porous deodorant. It is an object of the present invention to provide an absorbent article.

  The absorbent article of the present invention is excellent in the deodorizing effect and does not leak the smell of excrement to the outside.

Hereinafter, the absorptive article of the present invention is explained based on the preferred embodiment.
As shown in FIGS. 1 and 2, the disposable diaper as an absorbent article of the present embodiment includes a liquid-permeable surface sheet 21, a liquid-impermeable leak-proof sheet 22, and a liquid-retaining absorbent body 10. Contains a porous deodorant.
The disposable diaper 20 of the present embodiment is worn together with a wearing tool such as an underwear or a diaper cover, and the absorbent body 10 is interposed between a liquid-permeable surface sheet 21 and a liquid-impermeable leak-proof sheet 22. A flexible side flap 23 interposed at the center in the width direction and extending outward in the width direction of the absorbent body 10 is provided, and a stretchable elastic member 24 is provided in the crotch region of the side flap 23 along the longitudinal direction. ing. And both the longitudinal direction both side edges of the back of the absorbent article 20 are each turned back to the surface sheet 21 side, and the 1st folding | turning part 25 in which the absorber 10 is contained is formed, and the side flap 23 in the 1st folding | turning part 25 is formed. The second folded portion 26 is formed by folding back to the leak-proof sheet 22 side, the first folded portion 25 is joined and fixed to the topsheet 21, and the second folded portion 26 is joined and fixed to the first folded portion 25. Yes.
In addition, the absorber 10 is arrange | positioned so that the center part of the longitudinal direction may contact | win the crotch area | region of the disposable diaper 20, This center part functions so that a bodily fluid etc. may be absorbed substantially. Moreover, although not shown in figure, in the width direction center of the leak-proof sheet 22, the vertically long rectangular-shaped adhesion area | region for fixing the disposable diaper 20 to a wearing tool is provided, and it protects with the peeling sheet before use. .

  As shown in FIG. 2, the absorbent body 10 of the present embodiment is formed by wrapping an absorbent material 11 having a vertically long rectangular shape so that one side 1 a and the other side 1 a of the laminated sheet 1 are overlapped. The one side part 1a and the other side part 1a are overlapped at the center in the width direction of the absorbent material 11, and are bonded or fused by a known method. Absorber 10 is covered with pulp sheet 3 except for its front end and rear end.

  Since one side part 1a and the other side part 1a in the absorbent body 10 of the present embodiment are not superposed on each other because the deodorant-containing sheet 2 is not interposed, no matter which one is placed on the upper side, the upper side of the superposed part However, the configuration of the laminated sheet of the present invention is such that only one side portion does not interpose the deodorant-containing sheet 2 and the other side. When the part has a configuration in which the deodorant-containing sheet 2 is interposed, one side part is arranged on the upper side of the other side part and overlapped.

As shown in FIGS. 2 and 3, the laminated sheet 1 has a rectangular shape whose length in the width direction is shorter than that of the pulp sheet 3 between two rectangular pulp sheets 3 and 3 of the same size. A deodorant-containing sheet 2 is interposed.
And the side part 1a, 1a of the lamination sheet 1 does not interpose the deodorant containing sheet | seat 2 over the whole side part 1a, respectively. As shown in FIGS. 2 and 3, the side portions 1a and 1a are each formed by laminating two pulp sheets 3 and 3 without interposing the deodorant-containing sheet 2 over the entire side portion 1a. It is a layer structure part. By adhering the pulp sheets 3 and 3 in the side portions 1a and 1a to each other, both side portions of the laminated sheet 1 are sealed, and the deodorant is prevented from falling off from the side end portions.

  The length L in the width direction of the side portion 1a is preferably 0.1 to 20 cm, more preferably 1 to 6 cm. By setting it to 0.1 cm or more, it is possible to prevent the deodorant from falling off.

  The deodorant-containing sheet 2 in the laminated sheet 1 of the present embodiment is a deodorant mixed paper having a deodorizing function, and is sandwiched between two pulp sheets 3 and 3 at the center in the width direction. The deodorant-containing sheet 2 and the pulp sheet 3 are laminated as described above by sheeting or bonding using an adhesive or the like.

  The length in the longitudinal direction of the deodorant-containing sheet 2 is the same as the length in the longitudinal direction of the pulp sheet 3, but the length in the width direction is when the deodorant-containing sheet 2 is disposed at the predetermined position. The side portions 1a and 1a are shorter than the length in the width direction of the pulp sheet 3 so that the deodorant-containing sheet 2 is not interposed over the entire side portion 1a. Although the thickness of the deodorant containing sheet | seat 2 should just be adjusted suitably according to a use, Preferably it is 0.1-2.0 mm, More preferably, it is 0.2-0.5 mm.

The pulp sheet 3 is a pulp sheet that does not contain a deodorant. By sandwiching the deodorant-containing sheet 2 between the two pulp sheets 3 and 3, the strength of the laminated sheet 1 is improved and the deodorant is performed. The agent is prevented from falling off.
Although the thickness of the pulp sheet 3 should just be adjusted suitably according to a use, Preferably it is 0.1-2.0 mm, More preferably, it is 0.2-0.5 mm.

The deodorant-containing sheet 2 is mainly composed of a porous deodorant and a fiber raw material.
As a fiber raw material of the deodorant-containing sheet 2, known natural fibers such as non-wood pulp such as straw and cotton can be used in addition to wood pulp such as NBKP and LBKP. Further, for the purpose of improving the sheet strength, synthetic fibers such as polyethylene fibers may be appropriately mixed.
The content of the fiber raw material in the deodorant-containing sheet 2 is preferably 50 to 99 wt%, more preferably 70 to 97 wt%. By setting it to 50 wt% or more, the sheet strength and flexibility are sufficient, and by setting it to 99 wt% or less, the deodorizing effect is sufficiently achieved.

  As the pulp sheet 3, paper, non-woven fabric or the like is used. In the case of paper, the same fiber material as the deodorant-containing sheet 2 can be used. Moreover, when it is set as a nonwoven fabric, all well-known nonwoven fabrics, such as a spunlace nonwoven fabric and a spun bond nonwoven fabric, can be used, for example.

  As a constituent material of the absorbent 11, known fibrous or powdery polymer absorbers such as pulp, non-woven fabric, polyacrylate, and starch graft polymer used in conventional absorbent articles can be used.

Thus, the porous deodorant has a pore volume of 20 to 200 mm in pore volume of 0.2 ml / g or more, preferably 0.6 ml / g or more in 1 g of the porous deodorant. , Have the pores.
If the pore diameter is less than 20 mm, the adsorption rate may be slow, such as when the particle diameter is large, and the deodorizing function may not be exhibited.
When the pore volume is less than 0.2 ml / g, the required amount of the deodorant increases, the cost of the product increases, and sufficient deodorizing ability may not be exhibited.
Here, the hole diameter and the volume are measured as follows.
Pore volume measurement method: After depressurizing a sufficiently heat-dried sample, pressurize with nitrogen gas, gas adsorption method (BET method) to obtain pore diameter and volume from nitrogen gas adsorption amount and equilibrium pressure, each pore diameter Measure the volume distribution.
For the measurement, a device name “Autosorb 3” manufactured by Cantachrome Co., Ltd. was used. As a pretreatment of the device, measurement was performed after treatment at 100 ° C. for 2 hours at a vacuum of 10 ⁻² torr or less.

More specifically, at least a part of the porous deodorant is preferably hydrophobic.
That at least a part is hydrophobic preferably means that at least the surface is hydrophobic. This makes the porous deodorant difficult to wet, and the deodorizing performance decreases when wet with excrement. Less.
The average particle size of the porous deodorant is preferably 1 to 500 μm from the viewpoint of fixability, dispersibility, and texture when introduced into the absorbent article.
The specific surface area of the porous deodorant is preferably 200 to 2000 m @ 2 / g from the viewpoint of obtaining a stable deodorizing ability.
The average pore diameter of the pores is preferably 20 to 100 mm from the viewpoint of obtaining a stable deodorizing ability.
The distribution of the pores is preferably as follows.
2-20 vol% of pores having a pore diameter of less than 20 mm in the total volume of the whole pores,
A pore having a pore diameter of 20 to 200 mm is 30 to 70 vol% in the total volume of the whole pore,
The pores having a pore diameter of more than 200 mm are 20 to 60 vol% in the total volume of the whole pores.
Note that these pores having different pore diameters may be continuous. That is, the distribution of the pores is the ratio of the volume of the portion corresponding to each pore diameter described above in each pore.

  Examples of such a porous deodorant include chemical activated carbon, porous polymer, silica gel, zeolite, and montmorillolite. Among these, chemical activated carbon and a porous polymer having a phenyl group are preferable. Specifically, examples of the chemical activated carbon include zinc chloride activated activated carbon and phosphoric acid activated activated carbon, and examples of the porous polymer include 2,6-diphenyl-p-phenylene oxide base polymer, divinylbenzene-styrene copolymer. Etc.

The content of the porous deodorant is preferably such that the volume of pores of 20 to 200 mm is 0.3 ml / 100 g or more, and 0.6 ml / 100 g or more with respect to the saturated absorption amount (g) of the absorbent article. More preferably. By setting it to 0.3 ml / 100 g or more, a sufficient deodorizing effect can be exhibited.
The saturated absorption amount is measured as follows.
Saturated absorption amount: The absorbent article is immersed in physiological saline for 30 minutes. After 30 minutes, the absorbent article is pulled up, drained for 30 minutes, and the weight (g) before immersion is subtracted from the weight (g) after draining, and this is defined as the saturated absorption amount.

The disposable diaper 20 is used as a disposable diaper for infants, adults or incontinent persons as usual.
And since the diaper of this embodiment uses the above-mentioned porous deodorant, the deodorizing effect is higher than the conventional one.
This is considered to be due to the following actions.
That is, body fluids discharged from the human body generally give off odors, but compounds represented by steroids among the odorous substances are relatively large in molecular weight and bulky, and interact with other compounds in excreta. Therefore, although it could not be adsorbed by pores having an opening area of less than 20 mm, which is the main pore in a conventional deodorant such as activated carbon, 20 like the pores of the porous deodorant used in the present invention, It is considered that such a bulky odorous substance can be rapidly adsorbed in pores in the mesopore region of ˜200 cm.
Moreover, by adopting the structure of the absorbent article as in the present embodiment, excrement such as body fluid is absorbed and retained in the crotch region, and the smell of excrement is removed by the deodorizing effect of the activated carbon. In addition, although the excreted body fluid is absorbed by the center part of the longitudinal direction of the absorber 10, as above-mentioned, the absorber 10 is covered with the pulp sheet 3 except the front end part and the rear end part. Therefore, the activated carbon does not flow out of the absorbent body 10 together with the absorbed body fluid and the like, and the body and the wearing tool are not soiled.

Although the manufacturing method in particular of the lamination sheet of this embodiment is not restrict | limited, Hereinafter, the preferable manufacturing method of the lamination sheet of this embodiment is demonstrated.
<Manufacturing method of laminated sheet of this embodiment>
The deodorant-containing sheet 2 is obtained from a slurry containing a porous deodorant and a fiber raw material and formed into a sheet shape by an ordinary wet papermaking method as usual. In addition to various additives used in ordinary papermaking, various binders for fixing the porous deodorant to the sheet are added to the slurry. As another method for producing the deodorant-containing sheet 2, a method of forming a sheet from a fiber raw material containing an additive and impregnating the sheet with a dispersion of a porous deodorant mixed with a binder can also be employed.
Moreover, the pulp sheet 3 is obtained by forming into a sheet form from a slurry mainly composed of fiber raw material by the same means as the deodorant-containing sheet 2.

  The deodorant-containing sheet 2 and the pulp sheet 3 obtained as described above are combined on a paper machine as usual, or are bonded with an adhesive using a bonding machine. Thus, a laminated sheet in which the deodorant-containing sheet 2 is interposed between the two pulp sheets 3 and 3 is obtained. Thereafter, the sheet width is adjusted to a desired sheet width in the slitting process to obtain the laminated sheet 1 of the present embodiment. At this time, both sides 1a and 1a are porous because the deodorant-containing sheet 2 is not interposed therebetween. The deodorant does not fall off and the product and the production line are not soiled.

  In addition, although the front-end part and rear-end part of the absorber 10 in the absorbent article 20 of this embodiment are not each covered with the pulp sheet 3, the absorbed body fluid etc. remain in the center part of the longitudinal direction, Since it does not penetrate to the rear end portion, the porous deodorant does not flow out from here together with the body fluid.

The absorbent article of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, the laminated sheet may be at least one side part as long as no deodorant-containing sheet is interposed, and the peripheral part including the one side part is entirely interposed with the deodorant-containing sheet. It does not have to be. Moreover, the deodorant containing sheet | seat does not need to interpose all the parts cut | disconnected at the time of manufacture over each part.
Further, the shape and size of the absorbent body of the present invention can be appropriately changed depending on the application.
In addition, the absorbent article of the present invention is not limited to the disposable diaper of the above embodiment, but is an absorbent article such as an unfolded or pants-type disposable diaper, an incontinence pad, a sanitary pad, or a treatment for a cage. There may be.
Further, the porous deodorant is preferably contained in the absorber as in the present embodiment, but the form to be contained is not particularly limited, for example, a form mixed with pulp fibers, a sheet made of pulp fibers Two sheets produced and prepared can be prepared and sandwiched between these two sheets.

[Test Example 1]
Using the porous deodorants shown in [Table 1] below, the following tests were conducted to evaluate each porous deodorant. The results are shown in [Table 2] below.

<Evaluation method>
In each weighing bottle of 50 mmφ, 0.1 g of each porous deodorant shown in [Table 1], 1.0 g of a water-absorbing polymer (trade name “AQUALIC CA”, manufactured by Nippon Shokubai Co., Ltd.) and 10 g of human urine. The odor was evaluated by five monitors according to the following evaluation criteria, and the average was evaluated. The same human urine was used so as to satisfy the same conditions.
Evaluation point (odor intensity)
5; smells very strong 4; strongly smells 3; smells (the same as the original urine odor)
2; weakened 1; very weak (not obvious as urine odor)
0: Odorless

  As is apparent from the results shown in Table 2, the deodorizers of Examples 1, 2 and 3 which are porous deodorizers used in the present invention show an excellent deodorizing effect, whereas The deodorizers of Comparative Examples 1, 2, 3, 4 and 5 that did not satisfy the conditions could not be deodorized to the extent that they were not recognized as urine odors.

Drawing 1 is a perspective view showing one embodiment of a disposable diaper as an absorptive article of the present invention. FIG. 2 is a cross-sectional view in the width direction of the absorbent body used in the disposable diaper shown in FIG. FIG. 3 is a cross-sectional view in the width direction of the laminated sheet used in the absorbent body shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Laminated sheet 2 Deodorant containing sheet 3 Pulp sheet 10 Absorber 20 Disposable diaper 21 Top sheet 22 Leakproof sheet

Claims (5)

An absorbent article comprising a liquid-permeable surface sheet, a liquid-impermeable leak-proof sheet and a liquid-retaining absorbent, and containing a porous deodorant,
The porous deodorant has pores such that the volume of pores having a pore diameter of 20 to 200 mm is 0.2 ml / g or more in 1 g of the porous deodorant. Absorbent article.   The absorbent article according to claim 1, wherein the porous deodorant is zinc chloride activated activated carbon.   The absorbent article according to claim 1, wherein the porous deodorant is a divinylbenzene-styrene copolymer.   The absorbent article according to any one of claims 1 to 3, wherein the total volume of the pores having a pore diameter of 20 to 200 mm is 0.3 ml / 100 g or more with respect to the saturated absorption amount of the absorbent article.   A deodorant-containing sheet containing the porous deodorant according to claim 1, wherein the deodorant-containing sheet is a slurry containing the porous deodorant and a fiber raw material. Absorbent article formed into a sheet by wet papermaking.

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