JP5420952B2 - Absorbent articles - Google Patents

Description

  The present invention relates to absorbent articles such as disposable diapers and sanitary napkins.

  Generally, absorbent articles such as disposable diapers and sanitary napkins are rolled up or folded after use so that the excrement adherence surface is on the inside, and placed in a highly airtight storage container such as a sanitary box or diaper storage container. It is used in such a manner that it is stored and discarded in a garbage bag when the storage amount in the container reaches a certain level. Absorbents, especially urine, do not have a strong odor immediately after discharge when the health condition is normal. After use, urea in the urine is decomposed into ammonia by bacteria in the air, resulting in a strong odor. Bring discomfort to the user. For this reason, in order to suppress the odor of the excrement after use, the deodorizing sheet containing a zeolite is arrange | positioned inside a top sheet (patent document 1), or an intermediate sheet (crepe paper) which wraps an absorber is deodorized. It has been proposed to contain an agent (Patent Document 2) and to arrange a deodorant sheet on the back side of the liquid-impermeable back sheet.

JP 2001-046423 A JP 2000-350745 A

However, in these prior arts, the deodorizing sheet containing only zeolite or activated carbon does not sufficiently exhibit the deodorizing effect in a wet state, and therefore, when placed on a top sheet or crepe paper, it is sufficient compared to the amount used. No deodorizing effect was observed.
Then, the main subject of this invention is providing the absorbent article from which the deodorizing effect is exhibited more effectively.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
An absorbent article comprising a liquid-permeable surface sheet, a liquid-impermeable sheet, an absorbent body interposed therebetween, and a packaging sheet that wraps the absorbent body,
In the packaging sheet , the region located on the top sheet side of the absorbent body was printed using an ink mainly composed of a deodorant, a resin, and a solvent that have a deodorizing effect in a wet state rather than a dry state. which has a printing unit,
In the packaging sheet, of the region located on the surface sheet side of the absorber, at least a portion overlapping with both ends in the width direction of the absorber is not printed with the ink,
An absorbent article characterized by the above.

(Function and effect)
Since the portion that absorbs and retains excrement, particularly urine, is an absorber, it is expected that a high deodorizing effect can be obtained by placing a deodorant near the absorber. However, while the vicinity of the absorber becomes wet after use, the porous particles such as zeolite and activated carbon that have been conventionally used as deodorant particles are sufficiently clogged with moisture in the wet state, And long-term effects could not be achieved. In the present invention, by using a deodorant that exhibits a higher deodorizing effect in a wet state than in a dry state, it is possible to dispose the deodorant on the surface sheet, the absorbent body, and the packaging sheet that wraps the absorbent body. . However, since the surface sheet is a part that directly touches the human body, there is a problem that yellowing or the like is noticeable when the deodorant contains metal ions such as silver ions, which is not preferable for the arrangement of the deodorant. The absorber has problems such as low moisture diffusibility and difficulty in uniformly dispersing the deodorant, and it is difficult to sufficiently exert the effect of the deodorant. Accordingly, in the present invention, the deodorant is disposed on the packaging sheet.

  The deodorizer is applied on the packaging sheet as an ink mixed with a resin and a solvent and used for printing the packaging sheet. Even if the deodorant is applied without containing the resin, the deodorant is hardly held on the packaging sheet. Further, since the packaging sheet itself has water absorption, moisture hardly diffuses, and some deodorizers are kept in a dry state, and the effects cannot be sufficiently exhibited. A resin-deodorant mixed film is formed on the packaging sheet by mixing a resin ink with a deodorant and applying and drying. Since moisture is hardly absorbed on this film, it flows and diffuses on the packaging sheet, so that a wider range of deodorant is placed in a wet state and a higher deodorizing effect can be obtained.

<Invention of Claim 2>
The absorbent article of Claim 1 which has the said printing part in the surface at the surface sheet side of the said packaging sheet.

(Function and effect)
Since the deodorant contained in the printing part is effective in a wet state, it is preferably arranged on the surface sheet side that is more susceptible to moisture. Also, odors from the absorbed exudates to the absorbent body, from the fact that many discharged to the surface sheet side, it is preferable to arrange the deodorant to the surface sheet side. Furthermore, at the time of manufacture, the absorbent body can be wrapped using a pre-printed packaging sheet, but printing on the surface on the surface sheet side can also be performed on the packaging sheet after the absorbent body is wrapped. Therefore, it is possible to select the printing timing in consideration of manufacturing efficiency.

<Invention of Claim 3>
The absorbent article according to claim 1 or 2, wherein the deodorant is a chemical deodorant that is ionized in a wet state and has an effect by capturing the odor component.

(Function and effect)
The deodorant used in the present invention is preferably a chemical deodorant that ionizes in a wet state. Such a chemical deodorant, unlike a physical deodorant that adsorbs an odor component such as activated carbon or zeolite, captures the odor component firmly by bonding. While activated carbon, zeolite, and the like decrease in the wet state, chemical deodorants such as metal complexes containing copper, iron or zinc, and ion exchange particles, in particular, provide a sufficient deodorant effect in the wet state. .

<Invention of Claim 4>
The ink contains 5 to 20 parts of a deodorant and 30 to 70 parts by weight of an organic solvent with respect to 100 parts by weight of the resin,
The resin is a urethane resin,
The absorbent article according to any one of claims 1 to 3, wherein the solvent is an alcohol-based or ester-based organic solvent.

(Function and effect)
As the resin of the present invention, a urethane-based resin is preferable in terms of high air permeability. As the solvent, an alcohol-based or ester-based organic solvent that has little influence on the human body even when remaining in the packaging sheet is suitable. As the alcohol type, isopropyl alcohol is preferred, and as the ester type, ethyl acetate and n-butyl acetate are particularly preferred.

<Invention of Claim 5 >
The absorbent article according to any one of claims 1 to 4 , wherein the packaging sheet is made of nonwoven fabric or paper and has air permeability.

(Function and effect)
If the sheet substrate of the deodorant sheet is such a breathable sheet, the substrate itself can exhibit a slight deodorizing effect due to odor adsorption, and the surface area of the substrate is large and breathable, so The probability of contact with the odorant is improved.

  As described above, according to the present invention, advantages such as a more effective deodorizing effect can be achieved.

It is a top view in the state where the diaper was developed showing the inside of a pants type disposable diaper. It is a top view in the state where the diaper was developed showing the outer surface of a pants type disposable diaper. FIG. 3 is a 3-3 cross-sectional view of FIG. 1. FIG. 4 is a sectional view taken along the line 4-4 in FIG. 1. FIG. 5 is a sectional view taken along line 5-5 in FIG. 1. It is sectional drawing which shows only the principal part of an underpants type disposable diaper. It is a front view of a product state. It is a rear view of a product state. It is a top view of the packaging sheet of the state which wrapped the absorber. FIG. 6 is a sectional view taken along line 6-6 of FIG. It is the figure which showed typically the cross section and deodorizing principle of the packaging sheet. It is a top view of the other example of a packaging sheet. It is a perspective view which shows the back side of the pants type disposable diaper of another form.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
1-8 has shown an example of the underpants type disposable diaper. This pants-type disposable diaper is composed of an exterior sheet 12 that forms the outer surface (back surface) of the product, and an interior body 200 that is attached to the inner surface of the exterior sheet. The interior body 200 is a part that absorbs and holds excrement such as urine, and the exterior sheet 12 is a part that is worn by the wearer. In addition, the dot pattern part in sectional drawing has shown the junction part which joins each structural member, and is formed by solid, beads, curtains, summits, spiral application, etc., such as a hot-melt-adhesive. The “front-rear direction” means the direction connecting the ventral side (front side) and the back side (rear side), “width direction” means the direction (left-right direction) orthogonal to the front-rear direction, and “up-down direction ”Means the wearing state of the diaper, that is, the direction perpendicular to the waistline when the diaper is folded in two at the crotch so that the both sides of the front and back of the diaper overlap, in other words, the waist opening It means the direction connecting the WO side and the crotch side.

(Interior body)
The interior body 200 can take any shape, but is rectangular in the illustrated form. As shown in FIGS. 3 to 5, the interior body 200 includes a surface sheet 30 on the body side, a liquid-impermeable sheet 11, and an absorption element 50 interposed therebetween. Yes, it is the main body that has the absorption function. Reference numeral 40 denotes an intermediate sheet (second sheet) provided between the top sheet 30 and the absorbent element 50 in order to quickly transfer the liquid that has passed through the top sheet 30 to the absorbent element 50. Shows barrier cuffs 60 that stand on the body side and are provided on both sides of the interior body 200 in order to prevent excrement from leaking to both sides of the interior body 200.

(Surface sheet)
The top sheet 30 has a property of transmitting liquid, and examples thereof include a porous or non-porous nonwoven fabric, a porous plastic sheet, and the like. Of these, the nonwoven fabric is not particularly limited as to what the raw fiber is. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. For example, if flexibility and drapeability are required, the spunbond method and spunlace method are preferable. If bulkiness and softness are required, the air-through method, point bond method, and thermal bond method are preferable processing methods. .

  Further, the top sheet 30 may be composed of one sheet or may be composed of a laminated sheet obtained by bonding two or more sheets. Similarly, the top sheet 30 may be composed of one sheet or two or more sheets in the planar direction.

  When the barrier cuff 60 is provided, both side portions of the top sheet 30 pass between the liquid-impermeable sheet 11 and the barrier cuff 60 to the back side of the absorbent element 50 to prevent liquid penetration. It is preferable to adhere to the impermeable sheet 11 and the barrier cuff 60 with a hot melt adhesive or the like.

(Intermediate sheet)
An intermediate sheet (also referred to as “second sheet”) 40 having a higher liquid permeation rate than the top sheet 30 can be provided to quickly transfer the liquid that has passed through the top sheet 30 to the absorber. This intermediate sheet 40 not only improves the absorption performance of the absorbent by quickly transferring the liquid to the absorbent body, but also prevents the “reversed” phenomenon of the absorbed liquid from the absorbent body, so that the top sheet 30 is always dried. It can be made into the state which carried out. The intermediate sheet 40 can be omitted.

Examples of the intermediate sheet 40 include the same material as the top sheet 30, spunlace, spunbond, SMS, pulp nonwoven fabric, mixed sheet of pulp and rayon, point bond, or crepe paper. In particular, an air-through nonwoven fabric is preferable because it is bulky. It is preferable to use a core-sheath composite fiber for the air-through nonwoven fabric. In this case, the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable. Basis weight is preferably ^{20~80g / m 2, 25~60g / m} 2 is more preferable. The thickness of the raw fiber of the nonwoven fabric is preferably 2.2 to 10 dtex. In order to make the nonwoven fabric bulky, it is also preferable to use an eccentric fiber, a hollow fiber, or an eccentric and hollow fiber that does not have a core at the center as the mixed fiber of all or part of the raw fiber.

  The intermediate sheet 40 in the illustrated form is disposed in the center shorter than the width of the absorber 56, but may be provided over the entire width. The length of the intermediate sheet 40 in the longitudinal direction may be the same as the length of the absorbent body 56 or may be within a short length range centered on the region that receives the liquid.

(Liquid impervious sheet)
The material of the liquid-impermeable sheet 11 is not particularly limited. For example, a plastic film made of an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric provided with a plastic film on the surface of the nonwoven fabric, or a plastic film For example, a laminated sheet in which a nonwoven fabric or the like is laminated and bonded to each other can be exemplified. For the liquid-impermeable sheet 11, it is preferable to use a liquid-impervious and moisture-permeable material that has been preferred in recent years from the viewpoint of preventing stuffiness. As a plastic film having moisture permeability, a microporous plastic film obtained by kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, forming a sheet, and then stretching in a uniaxial or biaxial direction. Is widely used. In addition, non-woven fabric using micro-denier fibers, leakproof reinforcement by reducing the voids of the fibers by applying heat or pressure, and methods such as applying a superabsorbent resin or hydrophobic resin or water repellent Thus, a sheet that is liquid-impermeable without using a plastic film can also be used as the liquid-impermeable sheet 11.

  The liquid-impermeable sheet 11 is preferably extended around both sides of the absorbent element 50 to both sides of the side surface 30 of the absorbent element 50 in order to improve leakage prevention. The width of this extended portion is suitably about 5 to 20 mm on each of the left and right sides.

  Further, an excretion indicator 80 whose color is changed by absorption of the liquid component can be provided on the inner side of the liquid-impermeable sheet 11, particularly on the side of the absorber 56.

(Barrier cuffs)
The barrier cuff 60 is a belt-like member that extends over the entire front and rear direction along both side portions of the interior body 200, blocks urine and soft stool that move laterally along the top sheet 30, and prevents side leakage. It is provided for this purpose. The barrier cuff 60 of the present embodiment is provided so as to stand up from the side portion of the interior body 200, the base side portion stands up obliquely toward the center in the width direction, and the tip side portion from the intermediate portion has a width. It stands up diagonally outward in the direction.

  More specifically, the barrier cuff 60 is formed by folding a belt-like barrier sheet 62 having a length equal to the length in the front-rear direction of the interior body 200 and folding it in the width direction. In addition, a plurality of elongated elastic elastic members 63 are fixed along the longitudinal direction at intervals in the width direction. An end of the barrier cuff 60 opposite to the folded portion in the width direction is an attachment portion 65 fixed to the back surface of the side edge of the interior body 200, and portions other than the attachment portion 65 protrude from the attachment portion 65. It is set as the protrusion part 66 (part by the side of a folding | turning part). Further, both end portions in the front-rear direction of the protruding portion 66 extend from the mounting portion 65 to the side surface of the topsheet 30 through the side portion of the interior body 200 and are hot-melted to the side surface of the topsheet 30. The base side portion is fixed to the front and rear fixing portion 67 by an adhesive or heat seal, and the tip side portion is folded back outward in the width direction from the tip of the base side portion and fixed to the base side portion. An intermediate part in the front-rear direction of the protruding part is an unfixed free part (inner free part), and an elongated elastic member 63 extending in the front-rear direction is fixed to the free part in an extended state.

The barrier sheet 62 is made of a spunbonded nonwoven fabric (SS, SSS, etc.), SMS nonwoven fabric (SMS, SSMMS, etc.), a melt-blown nonwoven fabric having excellent uniformity and concealment, and water repellent with silicon as necessary. A treated product can be suitably used, and the fiber basis weight is preferably about 10 to 30 g / m ² . As the elongated elastic elastic member 63, rubber thread or the like can be used. When spandex thread rubber is used, the thickness is preferably 470 to 1240 dtex, more preferably 620 to 940 dtex. The elongation rate at the time of fixation is preferably 150 to 350%, more preferably 200 to 300%. Further, as shown in the drawing, a waterproof film can be interposed between the barrier sheets folded in two.

  The number of the elongated elastic stretch members 63 provided in the free part of the barrier cuff 60 is preferably 2-6, and more preferably 3-5. The arrangement interval 60d is suitably 3 to 10 mm. If comprised in this way, in the range which has arrange | positioned the elongate elastic expansion-contraction member 63, it will become easy to contact | abut with respect to skin. The elongated elastic elastic member 63 may be disposed not only at the distal end side but also at the base side.

  The fixing target of the attachment portion 65 of the barrier cuff 60 can be an appropriate member such as the top sheet 30, the liquid-impermeable sheet 11, the absorbent element 50 in the interior body 200.

  In the barrier cuff 60 thus configured, the contraction force of the elongated elastic elastic member 63 acts to bring the both ends in the front-rear direction close to each other, but the both ends of the projecting portion 66 are fixed so that they do not stand up. On the other hand, since they are non-fixed free portions, only the free portions stand up against the body side as shown in FIG. In particular, when the attachment portion 65 is located on the back surface side of the interior body 200, the barrier cuff 60 stands up so that the barrier cuff 60 opens outward in the width direction at and around the crotch portion. It comes in contact, and the fit is improved.

The dimensions of the barrier cuff 60 can be determined as appropriate. In the case of an infant paper diaper, for example, as shown in FIG. 6, the standing height of the barrier cuff 60 (the length in the width direction of the protruding portion 66 in the unfolded state) W6 is It is preferably 15 to 60 mm, particularly 20 to 40 mm. In addition, when the barrier cuff 60 is folded flat so as to be parallel to the surface of the topsheet 30, the separation distance W3 between the innermost folds is preferably 60 to 190 mm, particularly preferably 70 to 140 mm.

  Unlike the illustrated embodiment, double (two rows) of barrier cuffs can be provided on the left and right sides of the interior body 200.

(Absorption element)
The absorbent element 50 includes an absorbent body 56 and a packaging sheet 58 that wraps the entire absorbent body 56.

(Absorber)
The absorber 56 can be formed of an aggregate of fibers. As this fiber assembly, a filament assembly obtained by opening as necessary a synthetic fiber tow (fiber bundle) such as cellulose acetate, in addition to those obtained by stacking short fibers such as cotton-like pulp and synthetic fibers Can also be used. The fiber basis weight can be set to, for example, about 100 to 300 g / m ² when cotton-like pulp or short fibers are stacked, and in the case of a filament aggregate, for example, about 30 to 120 g / m ^2. Can do. The fineness in the case of a synthetic fiber is 1-16 dtex, for example, Preferably it is 1-10 dtex, More preferably, it is 1-5 dtex. In the case of a filament aggregate, the filament may be a non-crimped fiber, but is preferably a crimped fiber. The crimped degree of the crimped fiber can be, for example, 5 to 75, preferably 10 to 50, and more preferably about 15 to 50 per inch. Further, a crimped fiber that is uniformly crimped is often used. It is preferable to disperse and hold superabsorbent polymer particles in the absorber 56.

  The absorber 56 may have a rectangular shape, but as shown in FIG. 1, as shown in FIG. 1, the hourglass has a front end portion, a rear end portion, and a narrow portion narrower than the front end portion and the rear end portion. The shape is preferable because the fit of the absorbent body 56 and the barrier cuff 60 around the legs is improved.

  Moreover, although the dimension of an absorber can be determined suitably, it is preferable to extend to the peripheral part of the interior body, or its vicinity in the front-back direction and the width direction.

(Superabsorbent polymer particles)
The absorber 56 can contain superabsorbent polymer particles in a part or all thereof. Superabsorbent polymer particles include “powder” in addition to “particles”. As the particle diameter of the superabsorbent polymer particles, those used in this type of absorbent article can be used as they are, and those having a particle size of 1000 μm or less, particularly 150 to 400 μm are desirable. The material of the superabsorbent polymer particles can be used without any particular limitation, but those having a water absorption of 40 g / g or more are suitable. High-absorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, and sodium carboxymethylcellulose crosslinks. Or an acrylic acid (salt) polymer can be used. As the shape of the superabsorbent polymer particles, a commonly used granular material is suitable, but other shapes can also be used.

  As the superabsorbent polymer particles, those having a water absorption rate of 40 seconds or less are preferably used. When the water absorption speed exceeds 40 seconds, so-called reversion in which the liquid supplied into the absorber 56 returns to the outside of the absorber 56 is likely to occur.

  Further, as the superabsorbent polymer particles, those having a gel strength of 1000 Pa or more are preferably used. Thereby, even if it is a case where it is set as the bulky absorber 56, the sticky feeling after liquid absorption can be suppressed effectively.

The basis weight of the superabsorbent polymer particles can be appropriately determined according to the amount of absorption required for the use of the absorber 56. Therefore, although it cannot be said unconditionally, it can be set to 50 to 350 g / m ² . If the amount of polymer is less than 50 g / m ^2, it is difficult to secure the absorption amount. When it exceeds 350 g / m ² , the effect is saturated.

  If necessary, the superabsorbent polymer particles can adjust the spraying density or spraying amount in the plane direction of the absorber 56. For example, it is possible to increase the application amount of the liquid excretion site as compared to other sites. When gender differences are taken into account, men can increase the front spray density (amount), while women can increase the center spray density (amount). In addition, a portion where no polymer exists locally (for example, in a spot shape) in the planar direction of the absorber 56 can also be provided.

(Packaging sheet)
As the material of the packaging sheet 58, tissue paper, particularly crepe paper, non-woven fabric, polylaminated non-woven fabric, a sheet having small holes, and the like can be used. However, it is desirable that the superabsorbent polymer particles be a sheet that does not escape. When a nonwoven fabric is used in place of the crepe paper, a hydrophilic SMS nonwoven fabric (SMS, SSMMS, etc.) is particularly suitable, and the material can be polypropylene, polyethylene / polypropylene composite material, or the like. The basis weight is preferably about 10 to 30 g / m ² , particularly about 20 g / m ² .

  The packaging form of the packaging sheet 58 can be determined as appropriate, but from the viewpoint of ease of manufacture and prevention of leakage of the superabsorbent polymer particles from the front and rear end edges, the cylinder is formed so as to surround the front and back surfaces and both side surfaces of the absorbent body 56. It is preferable that the front and rear edges of the absorbent body 56 are protruded from the front and back of the absorbent body 56, and the protruding portions are crushed in the front and back directions and joined by a joining means such as a hot melt adhesive.

  As shown in FIG. 9, the packaging sheet 58 that wraps the entire absorbent material 56 has a deodorant printing unit 100. The deodorant to be used is not particularly limited as long as it has an effect in a wet state, but is a metal complex such as iron chlorophyllin sodium, inorganic deodorant particles having ion exchange ability (eg, Kesmon NS series, Toa Gosei). A chemical deodorant such as a product manufactured by Co., Ltd. is preferably used. Unlike a physical deodorant that adsorbs an odor component such as activated carbon or zeolite, a chemical deodorant has a property of capturing the odor component and then converting the component to a state in which no odor is generated. The metal complex and the inorganic deodorant particles can be used alone or in combination.

  The deodorant is not in direct contact with the skin, but it is preferable to use a deodorant with little skin irritation. For example, iron chlorophyllin complexes are also used in foods and are considered to be less harmful due to skin adhesion. In addition, data on the safety of inorganic deodorant particle Kesmon has been clarified (Toa Gosei Research Annual Report TREND 2000 No. 3 pp. 52-56).

  A metal complex such as sodium iron chlorophyllin is captured and converted by capturing an odor component by forming a ternary complex by coordinating an odor component and dissolved oxygen to a metal ion. The metal ion to be used can be selected from iron, copper, silver or zinc.

  Inorganic deodorant particles include those having proton type or metal ion type cation exchange ability, those having anion exchange ability, and the like, and these can be used alone or in combination. It is also preferable to use deodorant particles having characteristics as a chemical deodorant by ion-substituting a part of a physical deodorant that adsorbs odor components such as activated carbon and zeolite. As a substance corresponding to such a zeolite having a chemical deodorizing function, for example, Zeomic of Sinanen Zeomic Co., Ltd. can be used.

Ammonia, which is one of the odor components of urine, is captured by the hydroxyl group and converted into an ammonium ion state by proton-type cation exchange particles having a hydroxyl group on the surface.
-OH + NH ₃ → -O ^- ..NH ₄ ⁺
Further, the odor component mercaptan is trapped by the coordination bond of sulfur of mercaptan to the ionized metal on the surface of the ion exchange particles into which the metal is introduced (2).
-M + RSH-> -M: S (R) H (M is a metal and R is an organic group.)
Anion exchange particles can trap acidic substances such as acetic acid.
^{_{-OH + RCOOH → -OH 2 + ··}} - OOCR

  In the present invention, a method is proposed in which an ink mainly composed of a deodorant, a resin, and a solvent is used to print on a base sheet, and a packaging sheet 58 containing the deodorant in the printed portion is obtained. Although the printed packaging sheet 58 may be supplied to the diaper production line, the packaging sheet 58 after the absorbent body 56 is packaged may be printed.

  The resin is not particularly limited as long as the deodorant can be held on the sheet base material, but a urethane-based resin (polyurethane resin) is preferable. Thus, by using resin with high air permeability, the contact efficiency of the odor with respect to a deodorizer becomes high, and the more outstanding deodorizing effect comes to be exhibited. The urethane resin can be obtained by reacting an organic diisocyanate compound and a polymer diol compound to synthesize a urethane prepolymer, and further reacting a chain extender and a reaction terminator. Examples of organic diisocyanate compounds that can be used to synthesize polyurethane resins include aliphatic diisocyanate compounds (eg, hexamethylene diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate), alicyclic diisocyanate compounds (eg, isophorone diisocyanate). , Hydrogenated xylylene diisocyanate, etc.), araliphatic diisocyanate compounds (xylylene diisocyanate, α, α, α ′, α′-tetramethylxylylene diisocyanate, etc.), aromatic diisocyanate compounds (eg, toluylene diisocyanate, diphenylmethane diisocyanate) Etc.).

  The ink can contain various inorganic pigments and organic pigments that are used in general printing inks and paints, but it is particularly desirable to use an ink that has little skin irritation.

  As the solvent, an alcohol-based organic solvent such as isopropyl alcohol or an ester-based organic solvent such as ethyl acetate or n-butyl acetate which has little influence on the human body even when remaining in the packaging sheet 58 is suitable.

  The ink composition is preferably 5 to 20 parts by weight of the deodorant and 30 to 70 parts by weight of the solvent with respect to 100 parts by weight of the resin. If the deodorizing agent is less than 5 parts by weight, the deodorizing effect is insufficient, and if it exceeds 20 parts by weight, precipitation is likely to occur, resulting in poor printing performance. If the solvent is less than 30 parts by weight, the resin-deodorant film becomes too thick, the air permeability of the packaging sheet is reduced, and the majority of the deodorant is coated with the resin, which may reduce the deodorization effect. . On the other hand, when the solvent exceeds 70 parts by weight, the moisture diffusibility described later becomes insufficient.

  FIG. 10 shows a cross section of the absorbent body wrapped in the packaging sheet 58 printed with the resin-deodorant ink, and FIG. 11 shows the details of the packaging sheet 58. Printing may be performed on the surface of the packaging sheet that is in contact with the absorbent body, on the surface of the back sheet (such as the liquid-impermeable sheet 11 or the exterior sheet 12), or on both surfaces. 30 and the intermediate sheet 40), the deodorant tends to be in a wet state, the odor component is easily discharged from the top sheet side, and the deodorization efficiency is high. Printing is possible even after the absorber is packaged. It is preferable because it has advantages such as being easy to manufacture. When printing with the resin-deodorant ink, the deodorant, the resin, and the solvent enter the packaging sheet, and then only the solvent evaporates, so that at least the printed surface of the sheet has the deodorant particles 101 and the resin 102. A deodorant layer 103 is formed (FIG. 11A).

When the moisture (urine) 104 that has passed through the top sheet 30 reaches the packaging sheet 58, the packaging sheet and the deodorant layer on the packaging sheet become wet (FIG. 11 (b)). While the packaging sheet base material 58 and the absorbent body 56 easily absorb moisture, the deodorant layer 103 on the packaging sheet easily diffuses moisture. Therefore, the presence of the deodorant layer distributes moisture over a wide range, and a larger amount of the deodorant becomes wet. At the same time that the deodorant becomes wet, the urine containing the odor component comes into direct contact with a wide range of the deodorant, so that the odor component can be captured effectively (FIG. 11 (c)).

  Here, the moisture diffusibility of the deodorant layer 103 indicates that the surface liquid flow distance in the surface liquid flow test described below is 100 mm or more and less than 250 mm both in the fiber direction of the packaging sheet and in the direction perpendicular to the fiber. Thus, it is preferable to adjust. In the surface liquid flow test, a packaging sheet containing the deodorant ink is placed on a three-layered filter paper, placed on a 45-degree inclined plate, and then from a height of 1 cm above the packaging sheet surface. 0.1 cc of artificial urine is dropped on the surface of the packaging sheet, and the distance by which the artificial urine flows from the dropping position on the surface of the packaging sheet is measured. If the surface liquid flow distance is less than 100 mm, urine is difficult to diffuse and the deodorant does not become sufficiently wet. Moreover, if it is 250 mm or more, urine is diffused too much, leading to leakage.

  Odor components are also generated from the urine absorbed by the absorber and try to come out (FIG. 11 (d)), but the generated odor component 105 disappears in a wet state when passing through the packaging sheet 58. Before coming out of the diaper in contact with the odorant layer, it is captured (FIG. 11 (e)).

  The deodorant of the deodorant layer 103 effectively exhibits a deodorizing function in a wet state, but the moisture (urine) 104 is widely diffused on the surface of the packaging sheet 58, so that the packaging sheet 58 itself is wide. It becomes wet in the range. Materials such as paper and nonwoven fabric used for the packaging sheet 58 are excellent in air permeability in the dry state, but the air permeability is greatly reduced in the wet state. Therefore, since the time for the generated odor component 105 to pass through the packaging sheet 58 is longer than that in the dry state, the deodorizer can capture the odor component 105 and effectively deodorize it.

  Since the layer on the back side of the diaper including the liquid-impermeable sheet 11 usually has moisture permeability (breathability), the effects described above with reference to (a) to (e) of FIG. Naturally, even when the printing of the agent ink is performed on the surface of the packaging sheet 58 with respect to the back sheet.

  However, considering the ease of diffusion of the excreted body fluid, it is particularly preferable to print the resin-deodorant ink on the surface of the packaging sheet 58 with respect to the top sheet. Odor components due to excrement such as ammonia and mercaptans are water-soluble, so odor components once released from the diaper without being trapped easily adhere to the sheet surface when they come into contact with the packaging sheet 58 again. Subsequently, the deodorant layer 103 is trapped. Such contact between the once released odor component and the packaging sheet 58 occurs particularly frequently in the inner space of the diaper in the wearing state (the space between the surface sheet 30 and the wearer's body surface). It is preferable to print the deodorant ink on the surface of the packaging sheet 58 with respect to the top sheet.

  By disposing the deodorant printing unit 100 over a wide area on the upper surface of the absorbent body, more deodorant and a wide range of packaging sheets can be brought into a wet state, but at least equivalent to both sides in the width direction of the absorbent body. It is preferable not to arrange a printing part in the part to be performed. When the printing part is arranged in a wide range, moisture tends to be diffused, but on the other hand, it is not sufficiently absorbed, and there is a risk of leakage from both sides in the width direction. In particular, it is possible to prevent leakage by providing absorption portions without printing on both sides in the width direction where leakage is likely to occur.

The shape of the printing unit 100 is not particularly limited as long as the deodorant layer is not disposed at least on both sides in the width direction of the absorbent body. In view of the deodorizing effect, it can be selected as appropriate. Other examples of the printing unit 100 are shown in FIGS. FIG. 12A shows an example in which printing portions are arranged in a diamond shape in a portion that is particularly susceptible to moisture. The length of the long axis of the rhombus was 50% or more of the length of the absorber, and the length of the horizontal axis was 70% or more and less than 90% of the width of the absorber. FIG. 12B shows an example in which printing units are arranged in a lattice pattern in order to diffuse moisture in the vertical and horizontal directions. FIG. 12C shows an example in which the printing unit is arranged on the surface of the packaging sheet 58 on the surface sheet side so as to have a rectangular shape that occupies as wide a range as possible. The length of the long side of the rectangle was the same as the length of the packaging sheet, and the length of the short side was 70% or more and less than 90% of the width of the absorber.

(Exterior sheet)
The exterior sheet 12 has a front body F extending from the crotch part to the ventral side and a back body B extending from the crotch part to the back side, and both side parts of the front body F and both side parts of the back body B 7 and 8, a torso opening WO for passing the wearer's torso and a pair of left and right leg openings LO for passing the legs are formed. Reference numeral 12A denotes a joining portion (hereinafter, this portion is also referred to as a side seal portion). In addition, the crotch portion means the front-rear direction center from the waist edge of the front body to the waist edge of the back body in the unfolded state, and the front part and the back part thereof are the front body F and the back body. B means each.

  The exterior sheet 12 includes a trunk periphery T that is defined as a longitudinal range extending from the trunk opening WO to the upper end of the leg opening LO, and an intermediate portion L that is defined as a longitudinal range of a portion that forms the leg opening LO. The waistline portion T can be conceptually divided into a “waist side end” W and a “waistline lower portion” U. These lengths in the front-rear direction vary depending on the size of the product and can be determined as appropriate. For example, the waist side end portion W may be 15 to 40 mm, and the waist lower portion U may be 65 to 120 mm. . On the other hand, both side edges of the intermediate portion L are bundled along the circumference of the wearer's leg, and this is a portion into which the wearer's leg is put. As a result, the exterior sheet 12 has a substantially hourglass shape as a whole. The degree of tightness of the exterior sheet 12 can be determined as appropriate, and, as shown in FIGS. 1 to 8, the narrowest part may be narrower than the width of the interior body 200 in order to obtain a clean appearance. Although it is preferable, the narrowest part may be determined so as to be equal to or larger than the width of the interior body 200.

  As shown in FIGS. 3 to 5, the exterior sheet 12 is formed by bonding two sheet base materials 12 </ b> S and 12 </ b> H with an adhesive such as a hot melt adhesive, and is located on the inner side. Although the base material 12H extends only to the edge of the waist opening WO, the outer sheet base material 12S wraps around the waist side edge of the inner sheet base material 12H and is folded back to the inside. 12r is extended so that it may coat | cover up to the waist side edge part of the interior body 200. FIG.

The sheet base materials 12S and 12H can be used without particular limitation as long as they are sheet base materials, but are preferably non-woven fabrics. The nonwoven fabric is not particularly limited as to what the raw fiber is. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. When using a nonwoven fabric, it is preferable that the basic weight shall be about 10-30 g / m < ² >.

Further, when the design sheet 25 described later is disposed, the total basis weight of the exterior sheet 12 is preferably about 20 to 60 g / m ² so that the design can be satisfactorily visually recognized from the outer surface of the product through the exterior sheet 12. It is preferable that the total light transmittance defined in JIS K 7105 of the sheet 12 is 40% or more, particularly 50% or more.

  The exterior sheet 12 is provided with elongate elastic members 15 to 19 such as thread rubber between the sheet base materials 12S and 12H at a predetermined elongation rate in order to improve the fit to the waistline. As the elongated elastic elastic members 15 to 19, synthetic rubber or natural rubber may be used. For bonding the sheet bases 12S and 12H of the exterior sheet 12 and fixing the elongated elastic members 15 to 19 sandwiched therebetween, hot melt bonding or heat sealing or ultrasonic bonding by various coating methods is used. Can do. If the entire exterior sheet 12 is firmly fixed, the texture of the sheet is impaired, which is not preferable. By combining these, it is preferable that the elongated elastic elastic members 15 to 19 are firmly bonded, and other portions are not bonded or bonded weakly.

More specifically, the width between the inner surface of the inner sheet base 12H and the outer surface of the folded portion 12r of the outer sheet base 12S at the waist end (upper end) W of the rear body B and the front body F is a width. The plurality of waist elastic elastic members 17 and 18 are fixed in a state of being stretched along the width direction at a predetermined stretch rate at intervals in the vertical direction so as to be continuous over the entire direction. In addition, one or more of the waist elastic elastic members 17 and 18 disposed in a region adjacent to the waistline lower portion U may overlap with the interior body 200 or overlap with the interior body 200. You may each provide in the width direction both sides except the width direction center part. As the waist resilient and elastic members 17 and 18, the thickness 155～1880Dtex, particularly about 470～1240Dtex (the case of synthetic rubber. Cross-sectional area in the case of natural rubber 0.05 to 1.5 mm ^2, in particular 0.1 the rubber thread of 1.0mm about ^2), 3 to 22 present approximately at intervals of 4 to 12 mm, an extension ratio 150% to 400%, preferably fixed in particular about 220-320%. The waist elastic elastic members 17 and 18 need not all have the same thickness and expansion rate. For example, the elastic elastic members have different thicknesses and expansion rates at the upper and lower portions of the waist end W. Also good.

  Further, between the outer side surface of the inner sheet base material 12H and the inner side surface of the outer sheet base material 12S in the lower waist portion U of the front body F and the back body B, except for the central portion in the width direction that overlaps the interior body 200. A plurality of elongated elastic elastic members 15 and 19 are vertically spaced along the width direction at a predetermined stretch rate so as to be continuous over the entire width direction at each of the upper side and both sides in the width direction. It is fixed in a stretched state.

The elongated elastic elastic members 15 and 19 of the lower waist part U have a thickness of 155 to 1880 dtex, especially about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , the rubber thread 0.1~1.0mm about ^2), 1 to 15 mm, particularly 5 to 30 present approximately at intervals of 3 to 8 mm, to secure in extension ratio 200 to 350%, particularly about 240 to 300% Is preferred.

  Moreover, between the outer side surface of the inner sheet base material 12H and the inner side surface of the outer sheet base material 12S in the intermediate part L of the front body F and the back body B, except for the center part in the width direction overlapping the interior body 200, A state in which a plurality of elongated elastic elastic members 16 are stretched along the width direction at a predetermined stretch rate at intervals in the vertical direction so as to be continuous over the entire width direction at each part on both sides in the width direction. It is fixed with.

The elongated elastic elastic members 16 and 18 of the intermediate portion L have a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, a cross-sectional area of 0.05 to 1.5 mm ² , The thread rubber of about 0.1 to 1.0 mm ² ) is fixed at 5 to 40 mm, particularly about 2 to 10 at intervals of 5 to 20 mm, respectively, with an elongation of 150 to 300%, particularly 180 to 260%. preferable.

  In addition, as shown in the drawing, the elongated elastic elastic members 15, 19, 16, and 18 of the lower waist portion U and the intermediate portion L are provided on both sides in the width direction except for the central portion in the width direction that overlaps the interior body 200. It is preferable that the interior body 200 does not shrink more than necessary in the width direction, and it does not look bad and does not deteriorate absorbability. In this form, in addition to the form in which the elastic stretchable member exists only on both sides in the width direction, the elastic stretchable member exists from one side of the width direction to the other side across the interior body 200, but overlaps the interior body 200. A configuration is also included in which the elastic stretchable member is cut at the center in the width direction so that the stretchable force does not act (substantially equivalent to not providing the elastic stretchable member). Of course, the arrangement of the elongated elastic members 15, 19, 16, 18 is not limited to the above example, and the elongated elastic expansion / contraction of the lower waistline U so that the elastic force acts on the entire widthwise direction of the lower waistline U. Part or all of the members 15, 19, 16, and 18 can be provided from one side in the width direction to the other side across the interior body 200.

  Further, when the elongated elastic elastic members 15 to 19 cross the design sheet 25 subjected to design printing described later, when rubber containing titanium oxide is used as the elongated elastic elastic members 15 to 19, It is preferable to use one having a low content (for example, 2% or less) or one containing no titanium oxide.

(Post-processing tape)
A post-processing tape 70 (fixing means) is provided at the center in the width direction on the outer surface of the rear body B of the exterior sheet 12. The post-processing tape 70 is for fixing the diaper in a state of being rounded or folded so that the top sheet 30 is on the inside and the front body F is on the inside. As shown in FIG. 5, in the general post-processing tape 70, a base end portion 71 is fixed to the outer surface of the exterior sheet 12 with an adhesive or the like, and a portion on the front end side of the base end portion 71 is tri-folded. (Folded in a Z-shaped cross section) or folded in half, and the portion between the folded portions is fixed (temporarily fixed) by the temporary fixing adhesive 72 so as to be peelable. Moreover, while having the knob | pick part 73 colored in opaque colors, such as white, in the front-end | tip part, the part except this knob | pick part 73 is transparent or semi-transparent, Through the transparent or semi-transparent part in this post-processing tape 70, A design to be described later is visible from the outer surface side of the post-processing tape 70. Although a specific structure can be appropriately configured, in the illustrated embodiment, the whole is formed by connecting a plurality of transparent or semi-transparent substrates in the longitudinal direction, and a colored tape 74 is bonded to the knob 73. Is adopted.

  At the time of disposal, the diaper is rounded or folded so that the top sheet 30 is on the inside and the front body F is on the inside, and then the folded portion of the post-processing tape 70 is peeled off and spread, and the diaper is rounded or folded. It is fixed with an adhesive so as to be wound from the rear body B over the waist opening WO to the opposite outer surface. The post-processing tape 70 is particularly preferably a tri-fold shape that can be folded compactly when not in use and can be expanded into a long shape when in use.

  Although not shown, the so-called tape-type disposable diaper is attached by attaching fastening tapes protruding from both sides of the back body to the abdominal outer surface in a state applied to the body, and after use, the fastening tape Once removed from the ventral outer surface, the front and back bodies are overlapped and rolled or folded from the crotch side so that the front body is inside, and then the fastening tape on both sides of the back body is rolled Or fold it from both sides of the diaper and fix it to the outer surface. Therefore, in the case of a tape-type disposable diaper, this fastening tape is also a post-processing tape.

  Moreover, as shown in FIG. 13, also in a pants-type disposable diaper, the post-processing tape 70 can be provided on both sides of the back body B as in the case of the fastening tape of the tape-type disposable diaper. Also in this case, after the diaper is rounded or folded so that the front sheet F is inside and the front body F is inside, the post-treatment tape 70 is pulled out, and wraps around both sides of the rounded or folded diaper, Wrap to the outer surface on the opposite side and fix.

  The fixing means such as the post-processing tape 70 may be provided on the front body F, or may be provided on both the back body B and the front body F.

(Design sheet)
A design sheet 25 that is designed by printing may be provided between the liquid-impermeable sheet 11 and the exterior sheet 12 (including the interlayer of the exterior sheet 12). The exterior sheet 12 may be omitted, and the design sheet sheet 25 may be exposed on the outer surface. In addition, the design sheet sheet 25 in the illustrated example has a smaller area than the body on which the design sheet is disposed, and is provided separately for the front body F and the back body B. It can also be provided so as to be continuous continuously up to the back body B.

  Although the size and shape of the design sheet 25 are not particularly limited, it is preferable to sufficiently increase the area in order to achieve a sufficient deodorizing function. For example, the width 25X of the design sheet 25 is the width of the absorber 56. The length 25Y of the design sheet 25 is preferably about 15 to 30% of the total article length Y on at least one side of the ventral side and the back side. Further, the shape of the design sheet 25 is preferably a rectangle as shown in the figure in that trim loss does not occur. However, the design sheet 25 has a geometric shape such as a circle, an ellipse, a triangle, a hexagon, or a shape along the periphery of the design. You may cut it. In addition, by applying a deodorant to the design sheet 25, it is possible to have a deodorizing function and to further enhance the deodorizing effect of the present invention.

As the sheet base material of the design sheet 25, a plastic film, a nonwoven fabric, paper, or the like can be used, but a bulky material having high air permeability is preferable. When the sheet base material of the design sheet 25 is a fiber aggregate having air permeability, particularly paper made mainly of pulp fibers, when using a plastic film, it is desirable to have moisture permeability in order to prevent stuffiness. Nonwoven fabric and paper are preferable because they have moisture permeability, and when performing design printing described later, it is preferable to use nonwoven fabric that has high smoothness and is easy to print, and paper that has high strength and is difficult to bleed ink. preferable. Particularly preferred are basis weight 15 to 35 g / m ² approximately, crepe paper having a thickness of about 0.1 to 0.3 mm (thin paper) and a basis weight 10 to 25 g / m ² approximately, a thickness of about 0.1 to 0.3 mm Non-woven fabrics (especially spunbond nonwoven fabrics and SMS nonwoven fabrics having a spunbond portion having a fineness of about 1.0 to 3.0 dtex). When crepe paper is used, the crepe rate is preferably about 5 to 20%, particularly about 5 to 15%. If the crepe rate is 20% or more, the amount of ink fixed increases, but blurring occurs and is not suitable for design printing. If the crepe rate is 5% or less, the amount of fixing is small because the ink hardly penetrates.

(Exterior sheet split structure)
In the above-described example, the front body F to the back body B are continuously covered with the integral exterior sheet 12, but the exterior sheet covers the stomach side of the wearer's waist and the back side The front end portion of the interior body is connected to the inner surface of the center portion in the width direction of the abdominal side exterior sheet with a hot melt adhesive or the like, and the center portion in the width direction of the back side exterior sheet. The rear end of the interior body is connected to the inner surface by a hot melt adhesive or the like, and the form in which the abdominal exterior sheet and the back exterior sheet are not continuous on the crotch side and are separated from each other may be adopted. it can. This separation distance can be about 150 to 250 mm. In this case, the back surface of the liquid-impermeable sheet in the interior body is crotch so as to cover the entire back surface of the interior body, or to cover the entire portion exposed between the abdominal exterior sheet and the back exterior sheet. A partial exterior sheet can also be fixed. As the crotch outer sheet, the same material as that used for the outer sheet described above can be used. The crotch outer sheet also corresponds to the outer sheet of the present invention.

  The present invention is suitable for a pants-type disposable diaper as in the above example, but can also be applied to a tape-type disposable diaper, a sanitary napkin, an absorbent pad, and the like.

DESCRIPTION OF SYMBOLS 11 ... Liquid impervious sheet, 12 ... Exterior sheet, 12r ... Folded part, 25 ... Design sheet, 200 ... Interior body, 30 ... Surface sheet, 40 ... Intermediate sheet, 50 ... Absorbing element, 56 ... Absorber, 58 ... Packaging sheet, 60 ... side barrier cuff, 62 ... barrier sheet, 100 ... deodorant printing part.

Claims (5)

An absorbent article comprising a liquid-permeable surface sheet, a liquid-impermeable sheet, an absorbent body interposed therebetween, and a packaging sheet that wraps the absorbent body,
In the packaging sheet , the region located on the top sheet side of the absorbent body was printed using an ink mainly composed of a deodorant, a resin, and a solvent that have a deodorizing effect in a wet state rather than a dry state. which has a printing unit,
In the packaging sheet, of the region located on the surface sheet side of the absorber, at least a portion overlapping with both ends in the width direction of the absorber is not printed with the ink,
An absorbent article characterized by the above. The absorbent article of Claim 1 which has the said printing part in the surface at the surface sheet side of the said packaging sheet.   The absorbent article according to claim 1 or 2, wherein the deodorant is a chemical deodorant that is ionized in a wet state and has an effect by capturing the odor component. The ink contains 5 to 20 parts of a deodorant and 30 to 70 parts by weight of an organic solvent with respect to 100 parts by weight of the resin,
The resin is a urethane resin,
The absorbent article according to any one of claims 1 to 3, wherein the solvent is an alcohol-based or ester-based organic solvent. The absorbent article according to any one of claims 1 to 4 , wherein the packaging sheet is made of nonwoven fabric or paper and has air permeability.

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