JP6061452B2 - Liquid absorption and hygiene products - Google Patents

Description

  The present invention relates to a liquid-absorbing liquid that absorbs liquid such as urination and a sanitary article using the liquid-absorbing liquid.

Recently, breeding of pets and the like indoors has become very popular, and a liquid absorbing sheet for pets for effectively treating excreta has been proposed.
By the way, as with humans, many owners are paying attention to the health status of pets. However, there are limits to examining changes in health status by observing the external status, so it is easy and early. There is a need to discover changes in state. Therefore, conventionally, a hot melt adhesive containing a pH indicator that changes color from neutral to alkaline is applied to the side of the absorber, so that a display part is provided on the top sheet. Sanitary goods (paper diapers, etc.) Is known (Patent Document 1).

JP 2008-050004 A

However, in the above sanitary goods, the pet animal directly touches the discoloration surface, etc., and depending on the type of pH indicator, the liquid such as urine is dried over time, and the discoloration of the pH indicator fades, resulting in bright In addition, the duration of the discoloration state that is uniformly discolored (hereinafter referred to as “fading time”) becomes short, and after a certain amount of time has elapsed, the discoloration state cannot be determined, and the appropriate state of health It had the problem that judgment would be difficult.
In recent years, even an absorbent article containing a pH indicator having a function of inspecting liquid such as urination has an aesthetic appearance (coloring or the like gives an appearance harmonizing with a storage place, a use place, etc.) However, there is a problem that when a commonly used dye is mixed and colored, the dye may inhibit the inspection. Furthermore, the absorbent article is inevitably discarded after use, but a pH indicator having a function of inspecting liquids such as urination is expensive, so it is required to be manufactured as inexpensively as possible. It was.

  The present invention has been made to solve the above-mentioned problems, and by vividly and uniformly changing color, the inspection result can be clearly distinguished after use, and it is excellent in aesthetics, inexpensive and easy. It is an object of the present invention to provide a liquid-absorbing liquid that can be manufactured and a sanitary article using the liquid-absorbing liquid.

  In order to solve the above problems, the liquid absorbing material of the present invention includes a water retention material, a water absorbent resin material, and an excrement inspection material, and the excrement inspection material has an adsorption rate of 20% by weight (preferably 25% by weight) or more, including a porous adsorbent having fine pores, and an excrement inspection indicator (hereinafter referred to as “inspection indicator”) adsorbed in the fine pores of the porous adsorbent. The amount of the indicator for inspection is in the range of more than 0.03% by weight and 0.5% by weight or less with respect to the total amount of the water retaining material and the water absorbent resin material. .

  Here, the water retaining material is a material having a liquid retaining performance or a liquid absorbing performance that enables a predetermined amount of liquid to be held in a gap or the like of itself, and is conventionally used as long as it does not hinder inspection. Various organic materials and inorganic materials that are used can be used.

  The water-absorbing resin material is a polymer material having a function of absorbing and gelling a large amount of liquid and holding the liquid.

The test indicator must be adsorbed on the porous adsorbent, and the adsorbing method is not particularly limited. However, the test indicator is fixed in a state where the test indicator is dissolved in a solvent (in particular, an ink composition). Is preferably fixed).
In addition, test indicators are various reagents that can recognize changes in health status, etc. by reacting with excrement such as urine to change color. Indicators for detecting urine pH values for detecting urine pH values ( Hereinafter, known indicators such as “urine pH value test indicator”), urine glucose detection indicator, urine protein detection indicator, urine occult blood detection indicator, or urine urobilinogen detection indicator can be used.

  According to the liquid absorption of the present invention, the test indicator is not directly added, but the test indicator is adsorbed on the porous adsorbent. Since the porous adsorbent adsorbs the test indicator in the gap, even if it is colored by the dye, the dye does not hinder the reaction to the test indicator, and the test result is clear after use. Since the determination is possible, the inspection can be performed effectively.

  Furthermore, by setting it as the structure provided with the surface sheet which has liquid permeability, the back sheet which has liquid-impervious performance, and the said liquid absorption interposed between the said surface sheet and the said back sheet, Sanitary goods having various effects can be provided.

  As this sanitary product, any product may be used as long as it has a liquid absorption between a plurality of sheet materials, and it can be applied to various products such as a water absorbent sheet, a paper diaper, and a urine pad. .

  According to the sanitary article of the present invention, since the present liquid absorption is interposed between the top sheet and the back sheet, compared with the sheet material on which the indicator for inspection which is a conventional product is printed only on the surface layer, Since the state in which the liquid component is retained can be continued for a long period of time, the time during which the color change reaction continues can be further extended, and the health state corresponding to the property can be examined over a long period of time. Therefore, even if the user is not gazing at the time of urination, the health condition can be easily checked by checking the discoloration status within a predetermined time.

  In the sanitary article, the liquid absorption is composed of two upper and lower layers, and the upper layer includes at least the excrement inspection material and the water retention material, and the lower layer includes the water retention material. And the water-absorbing resin material is included, that is, the excrement inspection material is included only in the upper layer, and the excrement inspection material is not included in the lower layer, Since expensive excrement inspection materials can be reduced, manufacturing costs can be reduced, which is preferable.

  According to the present invention, by vividly and uniformly changing color, the test result can be clearly discriminated after use, and it has excellent aesthetics, and can be manufactured inexpensively and easily. Sanitary goods using can be provided.

It is sectional drawing which shows the liquid absorbing sheet (1st Embodiment) of this invention. It is sectional drawing which shows the liquid absorbing sheet (2nd Embodiment) of this invention.

With regard to one mode for carrying out the present invention (hereinafter referred to as “embodiment”), first, a liquid absorbing liquid (hereinafter referred to as “this liquid absorbing liquid”) will be described, and subsequently, a liquid absorbing liquid using the liquid absorbing liquid will be described. A liquid sheet (hereinafter referred to as “this liquid absorbent sheet”) will be described in detail with reference to the drawings.
Moreover, the indicator for a test | inspection is demonstrated taking the indicator for a urine pH value test | inspection as an example.

(1) Liquid Absorbing The liquid absorbing is formed from a constituent material including a water retention material, a water absorbent resin material, and an excrement inspection material.

<Water retention material>
The water retention material has a certain level of liquid absorption performance or liquid retention performance, and in the inspection of excrement, a substance that obstructs the inspection (for example, when observing the fluctuation of the pH value of excrement, its There is no restriction on the material etc.
For example, virgin pulp, which is organic waste material derived from paper that does not hinder the inspection of pH value, pulp waste material formed into a cotton shape (hereinafter referred to as “cotton pulp”), toilet paper waste material, tissue paper waste material, decorative paper One or more of waste materials, waste paper waste materials, paper towel waste materials, nonwoven fabric waste materials, pulverized plastic waste materials, pulverized wood materials (eg, crushed waste wood, crushed wood containing hiba oil or hinokitiol), etc. Various types of mixtures can be used. These materials are used by being pulverized into granular materials having a particle size of 0.5 millimeters or less, preferably 0.3 millimeters or less, so that liquid absorption or the like is possible.

In addition, inorganic materials such as bentonite, zeolite, and titanium oxide can be used as the water retention material.
In addition, a deodorizing material, a deodorizing material, a substance having an insecticidal action / bactericidal action, a colored substance, and a substance capable of exhibiting other effects without impairing water absorption performance may be blended.

<Water-absorbing resin material>
The water-absorbent resin is a high-molecular material (polymer) that has a function of absorbing a large amount of liquid to be gelled and holding the liquid, and a known substance that does not hinder the inspection is used in the inspection of excreta. it can. For example, as the water-absorbing resin material, a material having water absorption performance such as CMC (carboxymethyl cellulose), polyvinyl alcohol (PVA), starch (T-α-modified starch, dextrin, wheat starch, potato starch) may be used. it can.

<Material for excrement inspection>
The excrement inspection material is obtained by adsorbing an ink composition containing a test indicator (hereinafter referred to as “test indicator-containing ink composition”) to a porous adsorbent.

(Indicator-containing ink composition for inspection)
The test indicator-containing ink composition is obtained by fixing a test indicator to the ink composition.

◎ Indicator for testing The measurement of the pH value of excreta should be carried out by detecting the pH value of the urine and detecting, for example, persistent acidic urine or alkaline urine to determine the need for calculus and other diseases. It is aimed. The pH value of urine in carnivorous animals such as dogs and cats is 4.3 to 7.0 when healthy, and the pH value is 4.3 to 7.0 when normal (healthy). PH value of less than 4.3 or a pH value of more than 7.0 at the time of illness can be discriminated by color change, that is, urine pH that changes color with pH value of 4.3 or 7.0 as a threshold value The determination can be made by using a value test indicator.

  Further, the pH value of human urine is 4.6 to 7.5 when eating a normal meal at the time of health, so that the pH value at the time of illness is less than 4.6 or the pH value at the time of illness 7 It is possible to discriminate a pH value exceeding .6 by color change, that is, by using a urine pH value test indicator that changes color with a pH value of 4.6 or 7.5 as a threshold value. be able to.

As indicators for urine pH value inspection having such a pH value, that is, a color change range of 4.1 to 7.7, thymol blue, phenolphthalein, tropeoline OOO, cresol red, phenol red, neutral red , Bromothymol blue, bromocresol purple, bromophenol red, p-nitrophenol, methyl red, bromocresol green, tetrabromophenol blue, chlorophenol red, methyl orange, ethyl orange, bromophenol blue, brilliant yellow, congo red or Since bromocresol blue and the like are present, the above indicator can be used alone or in combination of two or more indicators depending on the purpose of detection.
In addition, when combining two or more types of appropriate indicators, it is preferable because a desired color change region can be set and a desired color change can be performed.
In addition, a universal indicator that can measure the pH value in the entire pH range can also be used.

  For example, when the threshold value of the pH value at the time of discoloration is 4.3, a solution of bromophenol blue or methyl orange and bromocresol green dissolved in ethanol is used, and the threshold value of the pH value at the time of discoloration is 7 If it is 0.0, bromthymol blue can be used.

◎ Ink composition The test indicator-containing ink composition is obtained by fixing a test indicator and a binder to a known ink composition, and in this embodiment, the urine pH value test indicator is, for example, It can be prepared by dispersing or dissolving cellulose and at least one of cellulose derivatives (hereinafter referred to as “cellulose or the like”) in an organic solvent. Specifically, varnish which is a kind of cellulose, hydroxypropyl cellulose and the like are added, dispersed in an organic solvent such as alcohols such as methanol and ethanol, aromatic hydrocarbons such as toluene, esters such as propyl acetate, Alternatively, it dissolves to form a test indicator-containing ink composition.
As for cellulose and the like, cerol, methylcellulose, ethylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose, carboxymethylcellulose and the like are preferable from the viewpoints of wettability and easy visual determination. In this case, it is preferable to select a solvent that can stably dissolve or disperse the test indicator and the resin as the binder.

  The binding agent is a water-soluble polymer compound (natural hydrophilic polymer compound, semi-synthetic hydrophilic compound) that does not interfere with the inspection of excrement, does not interfere with the discoloration of the test indicator, and stabilizes the discolored color. Molecular compounds) and water-insoluble polymer compounds that do not interfere with the examination of excrement and do not interfere with the discoloration of the test indicator and have a film-forming function. Is preferably formed.

As the natural hydrophilic polymer compound, sweet potato starch, potato starch, rice bran powder, cloth seaweed, sodium alginate, troolloi, tongaro gum, gum arabic, dextran, levan, glue, gelatin, casein and collagen can be used.
As the semi-synthetic hydrophilic polymer compound, cellulose derivatives such as methyl cellulose, hydroxypropyl cellulose, hydroxyethyl cellulose and carboxymethyl cellulose, and dialdehyde starch derivatives can be used.

  In addition, as the water-insoluble polymer compound having a film forming function, cellulose resins such as nitrocellulose, cellulose acetate, ethyl cellulose, and cellulose acetate butyrate can be used, and polyester resins, alkyd resins, polyurethane resins, and epoxy resins can be used. Resin, acrylic resin, vinyl chloride resin, vinyl chloride copolymer resin, polyvinyl butyral, polyvinyl acetate emulsion, vinyl acetate copolymer (vinyl acetate-acrylic ester, etc.) emulsion, acrylate copolymer emulsion, epoxy resin emulsion and Synthetic rubber latex or the like can be used. Among these polymer compounds having a film forming function, urethane resin and polyvinyl butyral are particularly preferable because they do not adversely affect the discoloration of the test indicator and the measurement of the pH value.

  Further, the above-mentioned test indicator-containing ink composition includes a surfactant, etc. (nonionic surfactant, anionic surfactant, cationic surfactant so as to form a binder, stabilizer or uniform reagent layer. Known additives such as zwitterionic surfactants or polyethylene glycols) can be added.

  In general, the constituents of the ink composition containing the test indicator and the blending ratio thereof are 1% to 10% by weight of the test indicator and binder, 1% to 15% by weight of cellulose and the like, and the paste is 10% by weight or less. Yes, the remainder is made up of solvent.

(Porous adsorbent)
The porous adsorbent needs to use an adsorbent that contains many fine pores (fine voids), has a large surface area, and has an adsorption rate of 20% by weight or more (preferably 25% by weight or more). , A-type silica gel and B-type silica gel) (silicon dioxide), zeolite (aluminosilicate) and the like can be used. In particular, the B type silica gel has an average adsorption surface area of about 450 (m ² / g), an average fine pore diameter of about 60 mm, and a fine pore volume of about 0.75 (ml / g)). Compared with a surface area of about 700 (m ² / g), an average fine pore diameter of about 24 mm, and a fine pore volume of about 0.46 (ml / g)), an ink composition containing an indicator for inspection is used. When adsorbing an object, high adsorption performance is exhibited, which is very suitable.

  It is also possible to add penetrants or swelling agents. As the penetrant, known substances such as various surfactants can be used, and as the swelling agent, known substances such as a cellulose-based swelling agent can be used.

  And the addition amount of the test | inspection indicator in the said excrement test | inspection material exceeds 0.03 weight% with respect to the total amount of a water retention material and a water-absorbent resin material (preferably 0. 0%). 1% to 0.3% by weight) is required. Therefore, when fixing the test indicator to the ink composition, the amount of the test indicator is adjusted so as to be within the above range, and the amount is determined according to the type of the porous adsorbent. There is a need.

  In order to maintain the aesthetic appearance before use, it is necessary to develop the liquid to have the desired lightness and saturation (especially, lightness is important) in advance. If the amount added is too small, color will not develop before use. On the other hand, the amount of the test indicator that can be adsorbed according to the porosity of the porous adsorbent is determined, and even if the test indicator is added more than necessary, the degree of discoloration before and after use (lightness) Will not change. For this reason, the inventor has found the above-described preferable addition amount through repeated experiments.

[Production method]
Then, the manufacturing method of this liquid absorption is demonstrated.
First, a test indicator-containing ink composition produced by a known method is dropped little by little on a fine powder of a porous adsorbent and mixed to adsorb the test indicator on the porous adsorbent. Prepare excrement inspection materials.

  The constituent ratio between the test indicator and the porous adsorbent is determined depending on the adsorption rate of the porous adsorbent. However, when the amount of the porous adsorbent added is larger than a predetermined amount, the particles of the porous adsorbent are exposed from the surface layer, and the exposed portion protrudes in a protruding shape from the surface layer. Further, when the liquid absorption is brought into contact with each other at the time of bagging or transporting, the protruding portion is separated from the base end portion, and the surface layer is damaged.

The addition amount of the indicator for inspection needs to be within the range of more than 0.03% by weight and 0.50% by weight or less with respect to the total amount of the water retaining material and the water absorbent resin material. When the indicator for use is fixed to the ink composition, the amount of the solvent or the like is adjusted so that the amount of the indicator for inspection is within the above range.
By the way, since the maximum adsorption rate of the porous adsorbent is determined by the substance, the minimum necessary amount of the porous adsorbent for adsorbing the necessary test indicator is determined and determined by that. Thus, the test indicator-containing ink composition is adsorbed to a sufficient amount of the porous adsorbent.

  Subsequently, a water retaining material such as pulp waste material is pulverized to a predetermined size by a crusher. Then, the pulverized water retention material, the excrement inspection material, and the water-absorbing resin material are put into a mixer so as to have a predetermined ratio and mixed. Thereby, this liquid absorption is manufactured.

[Function and effect]
According to the present liquid absorption, the test indicator is once dissolved in a solvent to form a test indicator-containing ink composition, and then adsorbed on the porous adsorbent. In this way, the test indicator is not directly added, but the test indicator is adsorbed in the gaps of the porous adsorbent, so that the dye is inspected even when it is colored by the pigment. Since the test results can be clearly discriminated after use without hindering the reaction to the above, the test can be performed effectively.

  Moreover, this liquid absorption manufactured by the above manufacturing processes can be manufactured cheaply and easily.

As mentioned above, although an example about suitable embodiment was demonstrated about this liquid absorption, this invention is not limited to the said embodiment, A design change is possible suitably in the range which does not deviate from the meaning of this invention.
In the above embodiment, the liquid-absorbing liquid is described as a powder product that is not particularly limited in shape, but depending on the application, a single-grain structure, a multi-layer granular structure, a powder-like structure, etc. It can also be formed in any shape.

In addition, the urine pH value detection indicator has been described as an example of the indicator for inspection, but the indicator for inspection is not limited thereto, and an indicator for detecting urine glucose, an indicator for detecting urine protein, an indicator for detecting urine occult blood, or Various indicators such as an indicator for detecting urinary urobilinogen can be used.
Furthermore, if a plurality of different types of test indicators are dissolved in a solvent and adsorbed on a porous adsorbent and added, a plurality of test results can be discriminated at a time.
it can.

(2) Liquid absorbing sheet [first embodiment]
Subsequently, as a sanitary product using the main liquid absorption 16, the liquid absorption sheet 10 for treating excrement for pets such as cats and dogs (hereinafter referred to as “the main liquid absorption sheet”) is taken as an example. Will be described.

  As shown in FIG. 1, the liquid absorbent sheet 10 includes a top sheet 11, a back sheet 12, a liquid absorbent 16 filled between the sheets 11 and 12, and a holding that encloses the liquid absorbent 16. And a sheet 13.

The top sheet 11 is a sheet material having a predetermined thickness formed from a non-woven fabric having water permeability (liquid permeability), and is formed in a rectangular shape. As this nonwoven fabric, known materials such as a spunlace nonwoven fabric formed of cellulose fibers such as polypropylene and rayon, and a spunlace nonwoven fabric formed of the above-mentioned cellulose fibers and hydrophilic synthetic resin fibers can be used. .
Further, the top sheet 11 is formed so as to be seen through from above so that the color of the main liquid-absorbing liquid 16 can be confirmed.

  The back sheet 12 is provided for preventing leakage of urine and odor emission, and is a known material having a predetermined water shielding performance (liquid shielding performance) and airtight performance, such as polyethylene, polyethylene (PE) polypropylene, polyethylene. A resin film such as terephthalate is used as a material.

The holding sheet 13 is further formed from a top sheet 14 and a holding sheet 15.
The upper surface sheet 14 is a sheet material having a predetermined thickness formed from a nonwoven fabric having water permeability (liquid permeability), and is formed in a rectangular shape (the material is the same as that of the surface sheet 11). . As this nonwoven fabric, known materials such as a spunlace nonwoven fabric formed of cellulose fibers such as polypropylene and rayon, and a spunlace nonwoven fabric formed of the above-mentioned cellulose fibers and hydrophilic synthetic resin fibers can be used. .

  Moreover, the carrying sheet 15 is also a sheet material having a predetermined thickness formed from a nonwoven fabric having water permeability (liquid permeability), and is formed in a rectangular shape (the material is the same as that of the top sheet 11). The same). However, the carrying sheet 15 may be formed of a material having non-water-permeable performance (non-liquid-permeable performance) so that urine does not leak outside.

  The carrying sheet 15 is laid and bonded on the back sheet 12, and is folded in the horizontal inner direction so that the four circumferences have a certain width in a state where a predetermined thickness is secured in the upward direction. An internal space for providing the liquid absorbing liquid 16 is secured. Then, the peripheral edge of the four circumferences on the upper surface of the upper surface sheet 14 is provided in the internal space of the carrying sheet 15 so as to contact the lower surface of the upper edge portion 15a of the holding sheet 15 that is a mouth shape in plan view. At the same time, the periphery of the four circumferences on the lower surface of the top sheet 11 is pressure-bonded so as to be in contact with the upper surface of the upper edge 15 a of the carrying sheet 15.

  The main liquid-absorbing liquid 16 formed from the water-retaining material 17 (for example, cotton-like pulp), the water-absorbing resin 18 (for example, CMC) and the excrement inspection material 19 is disposed between the top sheet 11 and the back sheet 12. The inner space of the formed carrying sheet 15 is filled in a laminated state so as to have a predetermined thickness.

  In addition, this liquid absorption 16 can also be made into a powder form or a some granular form according to the use of the liquid absorption sheet 10. FIG. Moreover, this liquid absorption 16 may be provided between the surface sheet 11 and the back surface sheet 12 in the state filled in the bag body which has the water permeability performance formed previously.

<Manufacturing method>
The liquid absorbent sheet 10 can be manufactured by a method similar to a method for manufacturing a normal sheet material.

<Effect>
According to the present liquid absorbent sheet 10, in addition to the effects of the present liquid absorbent 16, there are the following unique effects.
That is, according to the present liquid-absorbing sheet 10, since the main liquid-absorbing liquid 16 is interposed between the top sheet 11 and the back sheet 12, a sheet material in which a conventional test indicator is printed only on the surface layer. Compared with, the liquid can be maintained for a long period of time, so the time during which the color reaction continues can be further extended, and the health condition according to its properties can be investigated over a long period of time. Can do. Therefore, even if the user is not gazing at the time of urination, the health condition can be easily checked by checking the discoloration status within a predetermined time.

Second Embodiment
A second embodiment of the liquid absorbent sheet 20 will be described with reference to FIG.
The liquid absorbent sheet 20 includes a top sheet 21, a back sheet 22, a liquid absorbent 26, and a bag body 23 for housing the liquid absorbent 26.

The bag body 23 is made of a non-woven fabric that can be seen through and has water permeability (liquid permeability), and the liquid absorbent 26 can be contained inside the bag body 23. Yes.
The inside of the bag body 23 is divided into two upper and lower layers by interposing an intermediate sheet 24 formed of a nonwoven fabric having water absorption performance and water permeability performance. The upper layer formed between the upper surface of the bag body 23 and the intermediate sheet 24 is filled with the water retaining material 27 and the excrement inspection material 29 and does not include the water absorbent resin 28. It has become. Further, the lower layer formed between the intermediate sheet 24 and the lower surface of the bag body 23 is filled with the water retaining material 27 and the water absorbent resin 28, and does not include the excrement inspection material 29. It has become.

  By adopting such a structure, the water retaining material 27, the water absorbent resin 28, and the excrement inspection material 29 are contained inside the bag body 23, and the bag body 23 as a whole is integrated with the liquid absorbing liquid. 26 is constituted.

  However, in the said embodiment, if the excrement test | inspection material 29 is not contained in the lower layer, it is good also as a structure by which the water absorbing resin 28 is contained in the upper layer. Further, if the upper layer and the lower layer are separated, the intermediate sheet 24 is not necessarily provided.

The back sheet 22 has predetermined water shielding performance (liquid shielding performance) and airtight performance, and is formed in a rectangular shape. Further, the back sheet 22 is provided so as to cover the entire lower surface of the bag body 23, the side surface of the bag body 23, and the four-circular part of the upper surface of the bag body 23 having a predetermined width.
And the surface sheet 21 is laid so as to cover the upper surface of the bag body 23 and the four peripheral portions 22a of the upper surface of the back surface sheet 22. The lower surface of the topsheet 21 and the four peripheral portions 22a of the top surface of the backsheet 22 are firmly pressed together, and the topsheet 21 and the backsheet 22 are united, and a large amount of urine treatment material 26 is placed inside the bag body 23. Can be included.

By using the liquid absorbent sheet 20 as described above, by providing the excrement test material 29 only in the upper layer where it is easier to confirm the color development, it is possible to mix the minimum amount necessary for the urine test. Since the excrement inspection material is expensive, it can be manufactured at low cost by reducing the amount thereof.
Moreover, since the liquid absorption 26 which is easy to scatter etc. is provided in the bag body 23, the liquid absorption sheet 20 can be manufactured easily.

  As mentioned above, although the case where it applied to a sheet | seat material as an example of the sanitary goods of this invention was demonstrated, if it has the same structure, it can also apply to a disposable paper diaper, a urine pad, etc.

  In order to investigate the performance of the water-absorbing treatment material of the present invention, a sample of the liquid-absorbing sheet of the first embodiment was prepared by the following production method, and a color development test was performed.

<Constituent materials>
Each sample used in the following tests is manufactured by the above-described method for manufacturing a liquid absorbent sheet, and includes a top sheet, a back sheet, a holding sheet, and the main liquid absorbent.

  The top sheet is formed from a non-woven sheet made of polypropylene as a main material, the back sheet is a film sheet made from polyethylene as a main material, and the holding sheet is formed from a virgin pulp sheet.

  This liquid absorption is formed from 38 g of recycled pulp (water retaining material), 6 g of carboxymethyl cellulose (water absorbent resin material), and excrement inspection material.

The excrement inspection material is composed of an inspection indicator-containing ink composition and a porous adsorbent.
The test indicator-containing ink composition was prepared by dissolving bromothymol blue (test indicator) (manufactured by Advantech Toyo Co., Ltd.) and cellulose resin in an organic solvent (mixed solution of industrial ethyl alcohol and methyl alcohol). (All are manufactured by Toyo Ink Manufacturing Co., Ltd.).
The blending ratio of the above materials was 10% by weight of the cellulose resin and 8% by weight of the paste.
Moreover, the fine powder (made by Hymo Co., Ltd.) of silica gel (B type) was used as the porous adsorbent.

<Sample>
The amount of the ink composition blended with respect to 44 g of the total amount of recycled pulp and carboxymethyl cellulose (hereinafter referred to as “pulp CMC total amount”) within the range of the blending ratio of the excrement testing material. 0.02 wt%, 0.03% wt, 0.031 wt%, 0.04 wt%, 0.05 wt%, 0.10 wt%, 0.15 wt%, 0.20 wt%, respectively 0.25 wt%, 0.30 wt%, 0.35 wt%, 0.40 wt%, 0.45 wt%, 0.49 wt%, 0.50 wt%, 0.51 wt%,. A total of 17 samples with different blending ratios changed by 52 wt% were prepared.

<Observation results>
Regarding each of the above samples, the coating layer part before use and after dropping an appropriate amount of physiological saline (sodium chloride concentration of 0.9% by weight) adjusted to have a pH of 6.8 (corresponding to after use) The degree of color development was visually observed and the brightness by the Munsell color system was measured (Table 1).

(1) Samples 1 and 2 in which the addition amount of the test indicator with respect to the total amount of pulp CMC is 0.02% by weight and 0.03% by weight are inappropriate that the color of the coating layer portion is not visually recognized before use. As a result.

(2) On the other hand, with respect to Samples 3 to 15 in which the addition amount of the inspection indicator with respect to the total amount of pulp CMC was 0.031 wt% to 0.50 wt%, green color development having a predetermined brightness occurred before use. And when the physiological saline similar to the above was dripped (equivalent after use), the brightness was improved, respectively, and the favorable result that the condition after use was able to be confirmed was obtained. In particular, samples 6 to 10 in which the change in the brightness before and after use was easy to be observed were those in which the addition amount of the test indicator was 0.10 to 0.30% by weight.
In addition, when an appropriate amount of physiological saline (sodium chloride concentration of 0.9% by weight) adjusted so that the pH was 8.0 was dropped on each sample, the sample was discolored to blue having the same brightness. confirmed.

(3) Regarding samples 16 and 17 in which the addition amount of the test indicator with respect to the total amount of pulp CMC was 0.51% by weight or more, green color was formed before and after use but the brightness did not change, and the situation after use The result was inappropriate.

  As described above, as a result of the color development test, the addition amount of the test indicator is within the range of more than 0.03% by weight and 0.5% by weight or less with respect to the total amount of pulp CMC (particularly preferably, 0.10 It has become clear that it is preferable to set the weight to 0.30 wt%.

DESCRIPTION OF SYMBOLS 10,20 Liquid absorbing sheet 11,21 Top sheet 12,22 Back sheet 13 Holding sheet 23 Bag body 16,26 Liquid absorbing 17,27 Water retaining material 18,28 Water absorbing resin 19,29 Material for excrement inspection

Claims (1)

A top sheet having liquid permeation performance, a back sheet having liquid permeation performance, and a powder-like liquid absorption interposed between the top sheet and the back sheet,
The liquid absorption includes a water retention material, a water absorbent resin material, and an excrement inspection material,
The excrement inspection material has an adsorption rate of 20% by weight or more, and includes a porous adsorbent having fine pores, and an excrement inspection indicator adsorbed in the fine pores of the porous adsorbent,
The excrement inspection indicator is fixed in the ink composition,
The addition amount of the excrement inspection indicator is in the range of more than 0.03% by weight and 0.50% by weight or less with respect to the total amount of the water retaining material and the water absorbent resin material,
The porous adsorbent is silica gel (B type),
The sanitary article which is a liquid-absorbing sheet for treating excrement for pets, wherein the excrement test indicator is a urine pH value test indicator .

Images