JP2014079284A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article with considerably improved deodorizing effect when worn for many hours.SOLUTION: In an absorbent article which has an absorber 4 between a back sheet 2 and a liquid permeable top sheet 3, as raw materials of the absorber 4, weakly acidic pulp 7 is blended, an antibacterial high water-absorbing polymer 9 is mixed in the absorber 4, and citric acid 8 composed of granular materials is added to the absorber 4. Above the absorber 4, a liquid permeable sheet 16 impregnated with malic acid 10 is placed.

Description

  The present invention relates to an absorbent article that dramatically improves the deodorizing effect during long-time wearing.

  Traditionally, pants-type disposable diapers, tape-type disposable diapers, flat-type disposable diapers, urine-absorbing pads, urine-removing liners, etc. are widely available as body fluid absorbent articles using absorbent articles. It is an indispensable article for comfortable daily life as a measure for mild incontinence, etc., even for those who need care and for healthy people. In order to absorb body fluids such as urine and watery stool, these absorbent articles have an absorbent body interposed between a liquid-impervious sheet or a back sheet made of a liquid-permeable sheet and a liquid-permeable top sheet. The basic structure is

  In particular, recently, a use form in which a urine-absorbing pad called an inner, a flat type paper diaper, or the like is laid in an underpants type or tape-clamped paper diaper called an outer is commonly used. This is because exchanging only the inner can contribute to cost reduction and the amount of dust can be reduced. Therefore, abundant urine-absorbing pads with different sizes and absorption amounts are provided in accordance with the number of exchanges.

  Among them, there is an increasing demand for a urine-absorbing pad that can be used for a long time, specifically, a sufficient sleeping time for a cared person and a long time corresponding to a worker's replacement span. This makes it possible to use the urine collection pad at night, which makes it possible to use it for a long time, and in principle, eliminates the need for replacing the urine collection pad at night. Because it can. Moreover, it is because it will not disturb a caregiver's sleep above all.

  One of the problems common to these absorbent articles is the problem of odor caused by body fluid such as excreted urine and watery stool. In particular, urine is frequently used, and long-term wearing of the urine collection pad inevitably absorbs and retains urine multiple times, and the problem of ammonia odor generated by bacterial growth is a problem for workers and caregivers. It is a big problem for both people. For this reason, attempts have been made to add a deodorizing function to absorbent articles, and the base material of the absorbent article is deodorized by coating the deodorant material, or a fragrance is added to mask the odor. Or, an antibacterial material is mixed to suppress the propagation of various bacteria. For example, an absorbent sheet (Patent Document 1) in which an odor control agent is mixed with fibers to form an odor control layer, a specific hydrophilic fiber or hydrophilic foam and an odor control agent are dispersed and mixed, or adjacent to each other. An absorbent article having a controlled odor control part (Patent Document 2), and a means for mixing an absorbent with an odor eliminating water-absorbing resin composition having excellent deodorizing characteristics that suppresses the growth of bacteria that produce ammonia. (Patent Document 3).

JP 2001-198155 A JP 2001-29384 A JP 2006-22218 A

  Urine absorbed by absorbent articles such as urine pads consists of about 98% water and about 2% urea produced by protein metabolism, and other trace amounts of chlorine, sodium, potassium, magnesium, phosphate, etc. Contains. Urea itself has almost no odor, but urea is decomposed by urease, an enzyme contained in bacteria in the air, on the surface of the wearer's skin, or in a paper diaper. Is generated. That is, urea is hydrolyzed to carbon dioxide and ammonia by the enzyme urease.

  Therefore, in order to solve the problem of ammonia odor in absorbent articles such as urine absorption pads, it is necessary to consider both suppressing the generation of ammonia from urea and suppressing the odor of generated ammonia. There is. Table 1 shows reference standards for the relationship between the degree of unpleasantness of the ammonia odor and the concentration of ammonia. The degree of unpleasantness of the ammonia odor varies depending on the ammonia concentration. If the ammonia concentration is 100 ppm or less, there is almost no odor and no discomfort is felt. On the other hand, if the ammonia concentration exceeds 500 ppm, a distinctly unpleasant odor will be felt, and if it exceeds 1000 ppm, an irritating odor will result. In addition, when the ammonia concentration is between 100 ppm and 500 ppm, the odor is felt, the way of feeling varies depending on the environment and physical condition, and the range may be uncomfortable.

  In solving the problem of ammonia odor, not only suppressing the ammonia odor, but also ensuring the safety of the suppression means to the body of the cared person wearing absorbent articles such as a urine absorption pad, and the suppression means Therefore, it is required that the feeling of wearing is not adversely affected.

  Furthermore, in order to apply the ammonia odor control means to absorbent articles such as urine absorption pads, it is required that the production line has good compatibility. For example, conventionally, activated carbon, zeolite, sepiolite, and bentonite are known as deodorizing materials. When these deodorizing materials have a small particle size, specifically, when the particle size is 250 μm or less, the specific surface area is enlarged and the deodorizing ability is increased, but the particles are easily scattered as dust. Is easy to agglomerate, the sprayability is poor, and it is difficult to blend into absorbent articles by the usual spraying method.

  Similarly, an antibacterial superabsorbent polymer (hereinafter referred to as antibacterial SAP) is widely known as a substance having a deodorizing action against ammonia. In addition to suppressing bacterial growth, the antibacterial SAP can neutralize ammonia produced from urine, and thus has a deodorizing action of ammonia, and absorbent articles using these are also provided. Therefore, in order to confirm the deodorizing action of the antibacterial SAP, the following samples 1 to 3 were prepared and the ammonia concentration was measured. The results are shown in Table 2.

[Sample 1]
Two absorbers (20 cm × 60 cm) of an upper layer and a lower layer were produced with a pad former, and this was laminated up and down with a water-permeable nonwoven fabric interposed therebetween, and the four sides were heat-sealed. The lower layer absorber was prepared by mixing 7.0 g of antibacterial SAP with 25.0 g of pulp, and the upper layer absorber was prepared by mixing 3.0 g of antibacterial SAP and 1.5 g of zeolite with pulp 15.0 g.

[Sample 2]
The structure was the same as that of Sample 1 except that zeolite was not mixed in the upper absorber.

[Sample 3]
In both the upper and lower absorbers, the same amount of non-antibacterial superabsorbent polymer (hereinafter referred to as non-antibacterial SAP) is mixed in place of antibacterial SAP, and zeolite is added to the upper absorber. The configuration was the same as Sample 1 except that the mixture was not mixed.

  An appropriate amount of the test solution was put in the center of these samples 1 to swell, then placed in a 5 L Tedlar bag, 900 ml of air was sealed, and the mixture was held at 30 ° C. for a predetermined time. Immediately after the lapse of 3 hours, 6 hours, and 9 hours, the ammonia concentration in the Tedlar bag was measured with a gas detector tube. The results are shown in Table 2. The test solution was artificial urine (urea: 25.0 g, sodium chloride: 9.0 g, magnesium sulfate heptahydrate: 0.6 g, potassium sulfate: 4.0 g, ammonium sulfate 2.5 g, purified water: 1 0.0L) was added 15 ml of urease (from MERCK / Tachinata beans, 50% glycerin solution, 1000 units / ml) diluted 100-fold, which is an enzyme that decomposes urea into carbon dioxide and ammonia by hydrolysis. Prepared.

  Sample 2 and sample 3 are different in whether antibacterial SAP is mixed with pulp (sample 2) or non-antibacterial SAP is mixed (sample 3). It is found that the anti-bacterial SAP has a high deodorizing effect because the antibacterial SAP has a high deodorizing effect. In addition, after 9 hours, the ammonia concentration in Sample 3 increased to 1000 ppm, which was an unpleasant odor and an irritating odor, whereas in Sample 2, it remained at 410 ppm, which is less than half that of Sample 3, but also uncomfortable. It has risen to a level where you can feel a near smell. On the other hand, sample 1 was added with zeolite, but after 9 hours, the ammonia concentration was 400 ppm, which was almost the same as sample 2, and zeolite known as a deodorant was used after a long time. It can be seen that it is less effective in suppressing ammonia odor.

  Therefore, although the antibacterial SAP is effective in deodorizing the ammonia odor, the effect is limited, and the antibacterial SAP is used alone or in combination with zeolite in a range of addition amount that does not adversely affect the caregiver's wearing feeling. In the absorbent article, the deodorizing effect when worn for a long time could not be dramatically improved.

  Patent Documents 1 and 2 provide that a deodorant is used. As a deodorant, a deodorant and a deodorant that absorb malodors, a deodorant that prevents the generation of malodors, and other odors as other odors. Substances that suppress bad odors such as fragrances that are masked by the use of are used. For example, chelating agents containing metal ions such as silver, zinc and copper are used as deodorants, neutral activated carbon and fiberized carbon adsorbents are used as deodorants and deodorants, and alcohols are used as fragrances. Fragrance is used. However, these odor control agents are intended to suppress the odor after the generation of ammonia that is the source of the odor, and neutralize the ammonia to eliminate the odor source or generate ammonia. It does not have antibacterial action to suppress the growth of bacteria including the urease that is the cause, it is only a coping therapy means, and the deodorizing effect when wearing for a long time is not sufficient.

  In Patent Document 3, a deodorant water-absorbing resin composition is provided, but there is a limit to the blending amount, and it does not have an action of neutralizing ammonia in order to eliminate the odor source. The deodorizing effect at the time of wearing was not able to be obtained under a comfortable wearing feeling. Therefore, conventionally, there has not been provided an absorptive article intended to realize the deodorization of ammonia odor from a plurality of viewpoints of suppressing generation of ammonia from urine and deodorization of generated ammonia.

  Therefore, the present invention solves the above-described conventional problems, and an absorbent article that has dramatically improved the deodorizing effect when worn for a long time, specifically, urine (about 100 to 150 ml / times × about 3 to 4 times). 3 to 4 times = 300 to 600 ml), and the ammonia concentration after 9 hours of wearing can be suppressed to 100 ppm or less, ensuring safety to the body, without adversely affecting wearing feeling, and comfortable It aims at providing the wearable absorbent article.

  In order to solve the above-mentioned problems, the present invention provides an absorbent article in which an absorbent body is interposed between a back sheet and a liquid-permeable top sheet. Absorbent article in which a highly water-absorbing polymer is mixed with an absorbent body, and a liquid-permeable sheet impregnated with malic acid is disposed above the absorbent body while spraying citric acid composed of granular materials on the absorbent body As a liquid-permeable sheet impregnated with malic acid, a liquid-permeable second sheet impregnated with malic acid was laid on the absorber.

  And while comprising an absorber into a 1st absorber and a 2nd absorber, and spreading the citric acid which consists of a granular material on a 1st absorber, the circumference | surroundings of a 1st absorber are a liquid-permeable scattering prevention sheet | seat. Winding and laminating the second absorbent on the first absorbent wound with the anti-scattering sheet to make an absorbent, and weakly acidic pulp as a raw material for one or both of the first absorbent and the second absorbent A liquid-permeable top sheet is used as a liquid-permeable sheet in which antibacterial superabsorbent polymer is mixed with one or both of the first absorbent body and the second absorbent body and impregnated with malic acid. did.

  Then, instead of the antibacterial superabsorbent polymer mixed in one or both of the first absorber and the second absorber, the antibacterial superabsorbent polymer is sprayed on the first absorber, and then the scattering prevention sheet is used. The third absorbent body was laminated on the second absorbent body to obtain an absorbent body. Further, instead of malic acid impregnated in the liquid-permeable top sheet, the anti-scattering sheet is impregnated with malic acid, and a granule having a particle size of 0.7 mm to 3.0 mm is used as the citric acid granule.

  Moreover, the application amount of citric acid granules is 0.1 g to 5.0 g / absorptive article, the blending amount of weakly acidic pulp is 10% to 70% wt / absorptive article, and has an antibacterial high water absorption property. The blending amount of the polymer is 5% by weight to 40% by weight / absorbent article, and a liquid-impermeable sheet or a liquid-permeable sheet is used as the back sheet.

  According to the present invention, the synergistic effect of “weakly acidic pulp”, “citric acid”, “antibacterial SAP”, and “malic acid” effectively suppresses the production of ammonia from urine and deodorizes the produced ammonia. And the deodorizing effect when worn for a long time can be dramatically improved. Specifically, it absorbs about 3-4 times of urine (100-150 ml / times × 3-4 times = 300-600 ml), and the ammonia concentration of the absorbent article after wearing for 9 hours is almost 100 ppm or less. Can be suppressed. In addition, citric acid and malic acid that are used as ingredients in food additives and various supplements can be used as a deodorant for absorbent articles. Even if you say it, you can ensure safety.

The principal part cross-sectional view which shows 1st Embodiment. The principal part cross-sectional view which shows 2nd Embodiment. The principal part cross-sectional view which shows 3rd Embodiment. The principal part cross-sectional view which shows 4th Embodiment. The chart which shows the characteristic of this invention. Explanatory drawing of the principal part of the measuring method of ammonia concentration.

  Hereinafter, an embodiment of an absorbent article according to the present invention will be described based on the drawings. FIG. 1 is a cross-sectional view of an essential part showing a first embodiment of an absorbent article 1 according to the present invention. The absorbent article 1 can be implemented as an outer such as a paper diaper or as an inner added to a paper diaper such as a urine removing pad and a urine removing liner. In the figure, reference numeral 2 denotes a back sheet, which is composed of a liquid-impermeable sheet or a liquid-permeable sheet. When the absorbent article 1 is implemented as an outer such as a paper diaper, a liquid-impermeable sheet made of polyethylene, polypropylene, or the like that prevents body fluid from being permeated by body pressure is used as the back sheet 2. In addition, when the inner sheet is added to a paper diaper such as a urine absorbing pad and a urine absorbing liner, the liquid impervious material made of polyethylene, polypropylene or the like is used as the back sheet 2 to prevent body fluid from permeating due to body pressure. On the other hand, when a body fluid is allowed to permeate through a paper diaper or the like as an outer, a liquid permeable sheet such as polyethylene, polypropylene, polyethylene terephthalate, rayon, or cotton is used.

  3 is a liquid-permeable top sheet made of polyethylene, polypropylene, polyethylene terephthalate, rayon, cotton or the like. 4a is a 1st absorber, 4b is a 2nd absorber, and both are laminated | stacked and the absorber 4 is comprised. The absorber 4 absorbs and retains body fluids such as excreted urine and watery stool, and is composed of pulverized pulp. Therefore, body fluids such as urine and watery stool excreted by the absorbent article 1 are quickly absorbed by the absorbent body 4 through the liquid-permeable top sheet 3. Depending on the intended use of the absorbent article 1 such as inner or outer, the absorbent body 4 is provided in a sufficient amount necessary to absorb and retain excreted body fluid such as urine and watery stool.

  The first feature of the present invention is that weakly acidic pulp 7 is blended as a raw material of the absorbent body 4. The absorber 4 is comprised from arbitrary several layers, and the weakly acidic pulp 7 is mix | blended as a raw material of at least 1 layer. In 1st Embodiment shown in FIG. 1, the pulverized pulp which mixed the normal pulp and the weak acidic pulp 7 was used as a raw material of both the 1st absorber 4a and the 2nd absorber 4b. In addition, you may mix | blend weakly acidic pulp 7 as raw material pulp only in one of the 1st absorber 4a or the 2nd absorber 4b. The compounding quantity of the weakly acidic pulp 7 with respect to the absorbent article 1 shall be 10 weight%-70 weight% / absorbent article. When the amount is less than 10% by weight, the neutralizing action of ammonia by the weakly acidic pulp 7 is not sufficient. When the amount exceeds 70% by weight, the risk of a rust problem on the production line is increased, and the cost is increased, resulting in lack of economic efficiency. Because. The weakly acidic pulp 7 is a pulp having a weak acidity when immersed in water, and the weakly acidic pulp 7 having a pH of about 4.0 to 4.5 formed in a sheet shape or a roll shape is pulverized and used as a raw material. To do. The weakly acidic pulp 7 neutralizes ammonia, that is, the acidic group of the weakly acidic pulp 7 is combined with ammonium ions in urine to form a neutralized product, thereby eliminating the odor of ammonia. .

  The second feature of the present invention is that the absorbent 4 is sprayed with citric acid 8 made of granular material. Citric acid is an organic compound contained in citrus fruits and is one of hydroxy acids, and is used as a food additive and various supplements, and is highly safe. As a deodorant, it is known to use an aqueous citric acid spray on a pet sheet for dogs and cats. In 1st Embodiment, while spreading the citric acid 8 which consists of a granular material on the 1st absorber 4a supplied continuously on a production line, the periphery of the 1st absorber 4a is a liquid-permeable scattering prevention sheet 5. The absorbent body 4 was configured by laminating the second absorbent body 4b on the first absorbent body 4a wound with the anti-scattering sheet 5. The scattering prevention sheet 5 is made of water-absorbing paper, and specifically, tissue paper or air laid nonwoven fabric is used. Since the citric acid 8 made of a granular material is wound by the scattering prevention sheet 5 and is sandwiched between the first absorbent body 4a and the second absorbent body 4b, it is not scattered during the manufacturing process or use.

  As the citric acid 8, a granular material is used as a point contact with metal members of various manufacturing apparatuses in the manufacturing process, and has a smaller contact surface than a liquid material and is excellent in rust resistance. This is because it is less likely to scatter than. Specifically, a granular material having a particle size of 0.7 mm to 3.0 mm is used as the granular material. Since the particle diameter is an average value, if the particle diameter is less than 0.7 mm, a lot of powdered citric acid is contained, and citric acid is likely to be scattered in the atmosphere or around the manufacturing apparatus, and adheres to the manufacturing apparatus. It may cause rust and contamination of the manufacturing equipment, and may cause the worker to suck. On the other hand, if it is larger than 3.0 mm, the user feels uncomfortable at the time of use, and the distribution density with respect to the surface area of the first absorber 4a is lowered. Further, when the particle size is in the range of 0.7 mm to 3.0 mm, the entanglement with the pulverized pulp of the first absorbent body 4a is improved. In addition, since the anhydrous form in which water is eliminated is superior in moisture resistance as compared with a hydrate containing water molecules, it is preferable that the citric acid granules are anhydrous.

  The amount of citric acid 8 made of granular material to the absorbent article 1 is 0.1 g to 5.0 g / absorbent article, more preferably 1.0 g to 4.0 g / absorbent article. This is because if the amount exceeds 5.0 g, the amount of scattering increases, the amount of deposition in the production apparatus and the amount of mixing increase, and the cost increases, resulting in lack of economic efficiency. If 0.1 g is sprayed, the deodorizing effect can be exhibited. However, in order to effectively exhibit the deodorizing effect, it is appropriate to spray 1.0 g or more. The citric acid 8 neutralizes ammonia, that is, the acidic group of citric acid 8 and ammonium ions in urine are combined to form a neutralized product, thereby eliminating the odor of ammonia.

  A third feature of the present invention is that an antibacterial superabsorbent polymer 9 (hereinafter referred to as antibacterial SAP9) is mixed in at least one layer of an absorber 4 composed of an arbitrary plurality of layers. . In 1st Embodiment, antibacterial SAP9 is mixed with both the 1st absorber 4a and the 2nd absorber 4b. Note that the antibacterial SAP 9 may be sprayed on the anti-scattering sheet 5 together with the antibacterial SAP 9 mixed in the absorber 4 or instead of the antibacterial SAP 9 mixed in the absorber 4. The amount of antibacterial SAP9 applied to the absorptive article 1 is 5 to 40% by weight / absorbent article. If the amount is less than 5% by weight, the neutralizing action of ammonia by the antibacterial SAP9 is not sufficient. If the amount exceeds 40% by weight, the absorbent article 1 becomes unsatisfactory and becomes a gel after water absorption. This is because the feeling of wearing is impaired, and the cost is high, resulting in lack of economic efficiency.

  Antibacterial SAP9 is a granule coated with an organic or inorganic antibacterial agent, which inhibits the activity of urease, an enzyme that hydrolyzes urea contained in urine to produce ammonia, and suppresses the production of ammonia. Can do. This is because the inorganic antibacterial metal or antibacterial organic substance adhering to the antibacterial SAP9 inhibits the activity of urease, which is an enzyme. Moreover, the antibacterial SAP9 neutralizes the produced ammonia and deodorizes it. Furthermore, antibacterial SAP9 can also suppress the growth of bacteria containing urease.

A fourth feature of the present invention is that a liquid-permeable sheet 16 impregnated with malic acid 10 is disposed above the absorbent body 4. The liquid permeable sheet 16 may be in any position as long as the liquid permeable sheet 16 is disposed above the absorber 4, and the liquid permeable top sheet 3 or the liquid permeable second sheet 11 is preferably used. There may be. In the first embodiment, malic acid 10 is impregnated in a liquid-permeable second sheet 11 laid between the liquid-permeable top sheet 3 and the second absorbent body 4b. Instead of the liquid-permeable second sheet 11, the liquid-permeable top sheet 3 may be impregnated with malic acid 10, or the scattering prevention sheet 5 may be impregnated with malic acid 10. The compounding amount of malic acid 10 is 0.005 g / ml to 0.6 g / ml with respect to the liquid-permeable top sheet 3 or the liquid-permeable second sheet 11 or the scattering prevention sheet 5 of about 10 g to 50 g / m ^2. It was an aqueous solution and the malic acid 10 of 0.05ml ^{/ m 2} ~1.00ml ^/ m 2 impregnated and dried.

  The liquid-permeable second sheet 11 is suitably made of an air laid nonwoven fabric. Airlaid non-woven fabric is a non-woven fabric in which heat-bonded fibers, pulp, etc. are dispersed in the air and bonded by applying heat. For example, a synthetic fiber having a core-sheath structure with a fiber length of 1 mm to 10 mm, polypropylene and polyethylene. A mixed fiber of terephthalate (PP / PET), or a mixed fiber of polyethylene and polyethylene terephthalate (PE / PET) and pulverized pulp are used as raw materials, and it has a three-layer structure with different mixing ratios of synthetic fiber and pulp fiber.

  The liquid-permeable second sheet 11 made of this air laid nonwoven fabric has a higher air density than an air-through nonwoven fabric and is close to tissue paper, so that even when heated, the hot melt adhesive hardly oozes out. On the other hand, the strength is higher than that of tissue paper even in a dry state or a wet state due to body fluid. Therefore, even if hot embossing is performed after a strong fixation using a hot melt adhesive is performed, the hot melt adhesive does not ooze out. Furthermore, it has the effect of improving the absorption rate of bodily fluids and preventing reversion.

  The present invention can be obtained singly or in partial combination by the synergistic effect of the “weakly acidic pulp 7”, “citric acid 8”, “antibacterial SAP9”, and “malic acid 10” shown in the first to fourth aspects described above. The deodorizing effect at the time of wearing for a long time which cannot be done can be improved dramatically. Specifically, it absorbs about 3-4 times of urine (100-150 ml / times × 3-4 times = 300-600 ml), and the ammonia concentration of the absorbent article after wearing for 9 hours is almost 100 ppm or less. Can be suppressed.

  The absorbent article 1 having the above configuration is configured by interposing an absorbent body 4 between a back sheet 2 and a liquid-permeable top sheet 3. That is, it is configured to include weakly acidic pulp 7, and antibacterial SAP 9 is mixed inside, and the citric acid 8 made of granular material is dispersed on the upper surface, and is wound by the liquid-permeable scattering prevention sheet 5. In addition, the absorbent body 4 is formed by adhering and laminating the second absorbent body 4b, which includes the weakly acidic pulp 7 and has the antibacterial SAP9 dispersed therein, on the first absorbent body 4a via a hot melt adhesive. Is adhered and fixed on the back sheet 2 with a hot melt adhesive applied in a predetermined range in the width direction and longitudinal direction of the back sheet 2, and the liquid-permeable side sheet 6 and the liquid-permeable side sheet 6 are interposed therebetween. The top sheet 3 and the top sheet 3 are integrally connected by appropriate means such as heat sealing in the longitudinal direction and the width direction, and the distal end portion of the liquid-impermeable side sheet 6 is a free end portion, and is extended in the longitudinal direction of the distal end portion. 1 to Is formed as the rising gathers 6a several elastic body (not shown) is additionally provided. The liquid-impervious side sheet 6 is suitably made of a water-repellent nonwoven fabric made of polyethylene, polypropylene, polyethylene terephthalate, etc., and the body fluid leaks until the excreted body fluid is absorbed by the absorbent body 4. To prevent. The upper and lower surfaces of the first absorbent body 4a are bonded to the liquid-permeable scattering prevention sheet 5 with a hot melt adhesive.

  Next, regarding the synergistic effects of “weakly acidic pulp 7”, “citric acid 8”, “antibacterial SAP9”, and “malic acid 10”, which are the first to fourth of the features of the present invention, a chart showing the features of the present invention shown in FIG. This will be described with reference to the drawings. The urea 21 contained in the urine absorbed by the absorbent article 1 is hydrolyzed 25 to carbon dioxide and ammonia by urease 24 which is an enzyme increased by the growth 23 of bacteria 22 contained in the air, thereby causing the odor. Ammonia 26 is produced. The weakly acidic pulp 7 in the present invention neutralizes and deodorizes the produced ammonia 26. Similarly, citric acid 8 in the present invention neutralizes and deodorizes ammonia 26.

  The malic acid 10 in the present invention neutralizes the ammonia 26 29 and suppresses the growth 23 of the bacteria 22 containing urease 30, thereby suppressing the production of ammonia 26 itself. Further, the antibacterial SAP9 in the present invention can suppress the production of ammonia 26 itself by neutralizing 31 the ammonia 26 and suppressing the growth 23 of the bacteria 22 including the urease 24. The hydrolysis 25 of urea 21 itself by a certain urease 24 can be inhibited 33.

  FIG. 2 is a cross-sectional view of an essential part showing a second embodiment of the absorbent article 1 according to the present invention. About the same structure as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted. In the second embodiment shown in FIG. 2, the antibacterial SAP9 is not mixed with the first absorbent body 4a and the second absorbent body 4b, but after the antibacterial SAP9 is sprayed on the first absorbent body 4a, It is a wound configuration.

  FIG. 3 is a cross-sectional view of an essential part showing a third embodiment of the absorbent article 1 according to the present invention. About the same structure as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted. 3rd Embodiment shown in FIG. 3 replaces with the 1st absorber 4a and the 2nd absorber 4b which mix | blended the normal pulp and weakly acidic pulp 7 in 1st Embodiment, and the 1st absorber 4a is only a normal pulp. The second absorbent body 4b uses a pulverized pulp composed only of weakly acidic pulp 7, and a liquid-permeable second sheet 11 is laid on the second absorbent body 4b, and a hot melt adhesive is used. It is a fixed configuration. Moreover, in place of the malic acid 10 impregnated in the liquid permeable second sheet 11 in the first embodiment, the liquid permeable top sheet 3 is impregnated with the malic acid 10.

  FIG. 4 is a cross-sectional view of an essential part showing a fourth embodiment of the absorbent article 1 according to the present invention. About the same structure as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted. In the fourth embodiment shown in FIG. 4, the absorber 4 is configured by laminating a third absorber 4 c on the second absorber 4 b. And instead of the 1st absorber 4a and the 2nd absorber 4b which mix | blended the normal pulp and the weakly acidic pulp 7 in 1st Embodiment, the 1st absorber 4a and the 2nd absorber 4b consist only of normal pulp. A pulverized pulp was used, and a pulverized pulp consisting only of weakly acidic pulp 7 was used for the third absorber 4c.

The structure shown in the first embodiment is adopted as an absorbent article, and a pulverized pulp obtained by mixing 6.85 g of normal pulp and 6.85 g of weakly acidic pulp as a raw material is used as a first absorbent, and antibacterial SAP 7 g is contained in the first absorbent. Were mixed, and 0.6 g of anhydrous citric acid composed of granules having a particle size of 0.7 mm was sprayed on the first absorbent body and wound with a scattering prevention sheet. Then, a pulverized pulp obtained by mixing 12.5 g of normal pulp and 12.5 g of weakly acidic pulp is used as a raw material to form a second absorbent, and 5 g of antibacterial SAP is mixed in the second absorbent, and malic acid is added to the liquid-permeable second sheet. A urine absorbing pad impregnated with 0.2 ml / m ² was defined as Example 1.

[Comparative Example 1]
The first absorbent is made of pulverized pulp of only normal pulp 25 g, the second absorbent is made of pulverized pulp of only ordinary pulp 15 g, and the amount of antibacterial SAP mixed with the second absorbent is 3 g. Comparative Example 1 was made in the same manner as Example 1 except that no citric acid was sprayed and a liquid-permeable second sheet was not used.

[Comparative Example 2]
The first absorbent is made of pulverized pulp of only normal pulp 25 g, the antibacterial SAP is replaced with 7 g of non-antibacterial SAP, and the second absorbent is made of pulverized pulp of only ordinary pulp 15 g. In addition, in place of antibacterial SAP, 3 g of non-antibacterial SAP was mixed in the second absorber, and citric acid was not sprayed, and the liquid-permeable second sheet was not used, as in Example 1 and Comparative Example 2. did.

[Comparative Example 3]
Example 1 except that the first absorbent is made of pulverized pulp of only normal pulp 13.7 g, the second absorbent is made of pulverized pulp of only normal pulp 25, and citric acid was not sprayed. It was set as Comparative Example 3 in the same manner.

[Comparative Example 4]
Comparative Example 4 was made in the same manner as Example 1 except that citric acid was not sprayed.

[Comparative Example 5]
The first absorbent is made of pulverized pulp of only normal pulp 13.7 g, the second absorbent is made of pulverized pulp of only normal pulp 25 g, and it is liquid-permeable without spraying citric acid. Comparative Example 5 was used in the same manner as Example 1 except that the second sheet was not used.

The structure shown in the fourth embodiment is adopted as the absorbent article 1, and the first absorbent is made from pulverized pulp of only ordinary pulp 8g as a raw material. The first absorbent is mixed with antibacterial SAP 8g, and the first absorbent. On top of this, 1.0 g of anhydrous citric acid composed of granules having a particle size of 0.7 mm was sprayed and wound with a scattering prevention sheet. Then, using 11.5 g of ordinary pulp as a raw material, the second absorbent is used as a raw material, and antibacterial SAP 6 g is mixed with the second absorbent, and only 3.3 g of weakly acidic pulp is formed on the second absorbent. A pants-type paper diaper in which a third absorbent body made of pulverized pulp was placed and a liquid-permeable second sheet was impregnated with 0.2 ml / m ^{2 of} malic acid was used as Example 2.

[Comparative Example 6]
A configuration similar to that of Example 2 was adopted except that the liquid-permeable second sheet was not impregnated with malic acid, and Comparative Example 6 was obtained.

[Comparative Example 7]
Instead of malic acid, the same configuration as in Example 2 was adopted except that a liquid-permeable second sheet was impregnated with chito acid, and Comparative Example 7 was obtained.

[Comparative Example 8]
The same as in Example 2 except that 3.3 g of ordinary pulp was used as the raw material and the third absorbent was used as the raw material, the liquid-permeable second sheet was not impregnated with malic acid, and citric acid was not sprayed. The configuration was adopted as Comparative Example 8.

  Using these urine-absorbing pads or pants-type disposable diapers according to Examples 1 and 2 and Comparative Examples 1 to 8, the effect of suppressing ammonia odor was measured. As shown in FIG. 6, the urine collecting pad 12 or the pants-type paper diaper 12 according to Examples 1 and 2 to be used and the urine collecting pad 13 or the pants-type paper diaper 13 according to Comparative Examples 1 to 8 are used. After 450 ml of the test solution 14 was swelled in the center, it was placed in a 5 L Tedlar bag 15, 900 ml of air was sealed, and the mixture was held at 30 ° C. for a predetermined time. Immediately after the lapse of 3 hours, 6 hours, and 9 hours, the ammonia concentration in the Tedlar bag 15 was measured by the gas detection tube. The results are shown in Tables 3 and 4. The test liquid 14 was artificial urine (urea: 25.0 g, sodium chloride: 9.0 g, magnesium sulfate heptahydrate: 0.6 g, potassium sulfate: 4.0 g, ammonium sulfate 2.5 g, purified water: 1.0 L), 10 ml of urease (from MERCK / Tachinata beans, 50% glycerin solution, 1000 units / ml), which is an enzyme that decomposes urea into carbon dioxide and ammonia by hydrolysis, is diluted 100 times. Prepared. The measurement results of ammonia odor of Example 1 and Comparative Examples 1 to 5 are shown in Table 3, and the measurement results of ammonia odor of Example 2 and Comparative Examples 6 to 8 are shown in Table 4.

  As shown in Table 3, the ammonia concentration of Example 1 is 7 ppm after 3 hours, 35 ppm after 6 hours, 62 ppm after 9 hours, and a level of 100 ppm or less with almost no odor. It is realized even after long wear of 9 hours. This is considered to be a synergistic effect of “weakly acidic pulp”, “citric acid”, “antibacterial SAP”, and “malic acid”, which are characteristic structures of the present invention.

  Comparative Example 3 and Comparative Example 4 have the same configuration except that Comparative Example 4 contains weakly acidic pulp as a raw material for the first absorbent body and the second absorbent body, but the ammonia concentration after 3 hours has passed. Compared with 61 ppm in Comparative Example 3, Comparative Example 4 has 38 ppm and is deodorized to about half the concentration. However, when 9 hours elapse, the comparative example 4 is 271 ppm as compared with the 274 ppm of the comparative example 3, and there is almost no difference. From this, it can be seen that the weakly acidic pulp greatly contributes to the initial deodorization but is not sufficient for the long-term deodorization.

  Example 1 and Comparative Example 4 have the same configuration except that Comparative Example 4 is not sprayed with citric acid, but Comparative Example 4 is 150 ppm after 6 hours, and 271 ppm after 9 hours. It is. On the other hand, Example 1 is 62 ppm even after 9 hours have passed, and it can be seen that application of citric acid is indispensable for deodorization after long-time wearing.

  In Comparative Example 1 and Comparative Example 2, Comparative Example 1 mixes the first and second absorbents with antibacterial SAP, while Comparative Example 2 mixes the same amount of non-antibacterial SAP. The ammonia concentration after the elapse of 3 hours is 26 ppm in Comparative Example 1 compared to 190 ppm in Comparative Example 2, and is deodorized to a concentration of 1/7 or less. However, after 9 hours, Comparative Example 2 has a value of 732 ppm, which is an unpleasant odor range, and Comparative Example 1 also has a value of 300 ppm. From this, it can be seen that the antibacterial SAP is highly effective for initial deodorization but is not sufficient for long-term deodorization.

  Comparative Example 3 and Comparative Example 5 have the same configuration except that Comparative Example 3 impregnates the liquid-permeable second sheet with malic acid, but the ammonia concentration after 3 hours is 48 ppm of Comparative Example 5. In contrast, Comparative Example 3 impregnated with malic acid is as high as 61 ppm. However, after 9 hours, the comparative example 3 is slightly lower at 274 ppm than the comparative example 5 of 300 ppm. From this, it is considered that malic acid can contribute to the deodorizing action after a long time.

  As shown in Table 4, the ammonia concentration of Example 2 is 3 ppm after 3 hours, 29 ppm after 6 hours, 74 ppm after 9 hours, and a level of 100 ppm or less with almost no odor is 9 hours. It is realized even after long wearing. This is considered to be a synergistic effect of “weakly acidic pulp”, “citric acid”, “antibacterial SAP”, and “malic acid”, which are characteristic structures of the present invention.

  Comparative Example 6 and Comparative Example 8 have the same configuration except that Comparative Example 6 blends weakly acidic pulp as a raw material for the third absorbent and sprays citric acid, but the ammonia concentration after 3 hours has elapsed. Compared with 6 ppm of Comparative Example 6, Comparative Example 8 has 8 ppm, which is almost the same. However, when 9 hours elapse, the comparative example 8 increases to 308 ppm, compared with 133 ppm of the comparative example 6. From this, it can be seen that the combined use of weakly acidic pulp and citric acid greatly contributes to long-term deodorization.

  Example 2 and Comparative Example 7 are the same except that Comparative Example 7 impregnates a liquid-permeable second sheet with chito acid known as a natural antibacterial agent in the same manner as malic acid instead of malic acid. However, the ammonia concentration after 3 hours was reduced to less than half of 3 ppm in Example 2 impregnated with malic acid, compared with 7 ppm in Comparative Example 7 impregnated with chito acid. Yes. Further, after 9 hours, Comparative Example 7 exceeds 135 ppm and 100 ppm, whereas Example 2 achieves 74 ppm of 100 ppm or less. This shows that malic acid contributes to the deodorizing action after a long time.

  From these facts, it can be seen that the deodorizing effect during long-time wearing, which is the subject of the present invention, can be obtained for the first time by the synergistic effect of “weakly acidic pulp”, “citric acid”, “antibacterial SAP”, and “malic acid”.

  According to the present invention, the synergistic effect of “weakly acidic pulp”, “citric acid”, “antibacterial SAP”, and “malic acid” effectively suppresses the production of ammonia from urine and deodorizes the produced ammonia. And the deodorizing effect when worn for a long time can be dramatically improved. Specifically, it absorbs about 3-4 times of urine (100-150 ml / times × 3-4 times = 300-600 ml), and the ammonia concentration of the absorbent article after wearing for 9 hours is almost 100 ppm or less. Can be suppressed. In addition, citric acid and malic acid that are used as ingredients in food additives and various supplements can be used as a deodorant for absorbent articles. Even if you say it, you can ensure safety.

DESCRIPTION OF SYMBOLS 1 ... Absorbent article 2 ... Back sheet 3 ... Liquid-permeable top sheet 4 ... Absorber 4a ... 1st absorber 4b ... 2nd absorber 5 ... Scatter prevention sheet 6 ... Impervious side sheet 6a ... Rising gather 7 ... weakly acidic pulp 8 ... citric acid 9 ... antibacterial SAP
10 ... Malic acid 11 ... Liquid permeable second sheet 16 ... Liquid permeable sheet

Claims (11)

In an absorbent article in which an absorber is interposed between the back sheet and the liquid-permeable top sheet,
In addition to blending weakly acidic pulp as a raw material of the absorber, antibacterial superabsorbent polymer is mixed with the absorber, and citric acid composed of granular materials is sprayed on the absorber, and malic acid is placed above the absorber. An absorbent article, characterized in that a liquid-permeable sheet impregnated with is arranged.   The absorbent article according to claim 1, wherein a liquid-permeable second sheet impregnated with malic acid is laid on the absorbent body as a liquid-permeable sheet impregnated with malic acid.   The absorbent body is composed of a first absorbent body and a second absorbent body, and citric acid composed of granular material is spread on the first absorbent body, and the periphery of the first absorbent body is wrapped with a liquid-permeable scattering prevention sheet. Then, the second absorbent body is laminated on the first absorbent body wound with the anti-scattering sheet to form an absorbent body, and a weakly acidic pulp is blended as one or both of the first absorbent body and the second absorbent body. In addition, a liquid-permeable top sheet is adopted as a liquid-permeable sheet in which an antibacterial superabsorbent polymer is mixed in one or both of the first absorbent body and the second absorbent body and impregnated with malic acid. Item 10. An absorbent article according to Item 1.   Instead of the antibacterial superabsorbent polymer mixed in one or both of the first absorber and the second absorber, the antibacterial superabsorbent polymer is sprayed on the first absorber, and then wound with a scattering prevention sheet. The absorbent article according to claim 3 to be worn.   The absorbent article of Claim 3 or 4 which laminated | stacked the 3rd absorber on the 2nd absorber and made it as an absorber.   The absorbent article according to claim 3, 4 or 5, wherein the scattering prevention sheet is impregnated with malic acid in place of the malic acid impregnated in the liquid-permeable top sheet.   The absorptive article according to claim 1, 2, 3, 4, 5 or 6 which uses a granular material with a particle size of 0.7 mm-3.0 mm as a granular material of citric acid.   The absorbent article according to claim 1, 2, 3, 4, 5, 6 or 7, wherein the amount of citric acid particles applied is 0.1 g to 5.0 g / absorbent article.   The absorbent article according to claim 1, 2, 3, 4, 5, 6, 7 or 8, wherein the blending amount of the weakly acidic pulp is 10 wt% to 70 wt% / absorbent article.   The absorbent article according to claim 1, 2, 3, 4, 5, 6, 7, 8 or 9, wherein the blending amount of the antibacterial superabsorbent polymer is 5 to 40% by weight / absorbent article.   The absorbent article according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10, wherein a liquid-impervious sheet or a liquid-permeable sheet is used as the back sheet.

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