JP5343438B2 - Pants-type absorbent article - Google Patents

Description

  The present invention relates to an absorbent article. More specifically, the present invention relates to an absorbent article such as a disposable pants-type disposable diaper that is excellent in heat retention and touch.

  The use of a material in which a material that emits a lot of far-infrared rays in a non-woven fabric so as not to warm or cool the body has been used for clothing such as underwear. For example, in the invention described in Patent Document 1, a heat storage and heat insulating material that can stably and efficiently obtain far-infrared radiation by using a far-infrared radiation fiber and a highly hygroscopic fiber together and a fiber product using the same are disclosed. Has been. However, in the technical field of fibers, it is necessary to mix a considerable amount of infrared radiation material in order to exert a predetermined effect. Therefore, a nonwoven fabric using the infrared radiation material is generally expensive. Therefore, when using such an infrared radiation substance for a disposable diaper, cost becomes high and has a big subject in cost.

  In the invention disclosed in Patent Document 2, a water vapor generating part is provided at a predetermined position of the paper diaper, and a heat generating sheet and a heat generating powder are arranged to generate water vapor using heat generated by the oxidation reaction. It is designed to improve excretion care and physiological functions. However, as in the invention disclosed in Patent Document 2, when a heat generating sheet or the like is used for a disposable paper diaper, there is a big problem in terms of cost.

Japanese Patent Application Publication No. 2000-27063 Japanese Patent Application Publication No. 2008-104602

-As described above, the present invention has a function of heating or preventing the body from being heated without specially using a conventional heating element, etc., and is excellent in heat retention and touch and low in cost. A pants-type paper diaper is provided.

  In order to solve the above-mentioned problems, a pants-type paper diaper according to the present invention comprises an absorbent main body including a top sheet, a back sheet, and an absorbent body disposed therebetween, and a body constituting the shape of the article. An interior sheet facing the side and an exterior body formed of an exterior sheet facing the interior sheet, and is composed of a front and rear waist region and a crotch portion corresponding to the wearer's abdomen and back, respectively. In the front and rear waist region, at least one auxiliary sheet is laminated on the interior sheet, and the auxiliary sheet is heat-sealed having at least 70% of fibers having a fiber diameter of 1.0 to 1.5 dtex or less. It is formed from an air-through nonwoven fabric made of fibers.

In the paper diaper of the present invention, a plurality of waist gather elastic bodies are formed at the periphery of the waist opening, and the auxiliary sheet is positioned at the end of the absorbent main body in the longitudinal direction from the lower end of the waist gather elastic body. It suffices if it is provided in the area between.
In yet another aspect, the auxiliary seat may be arranged on the interior seat so as to widely cover the lower abdomen and / or the back waist where the necessity of keeping warm is high.
Further, the auxiliary sheet may have a wavy shape, and by using such a shape, the area of the auxiliary sheet is increased, and the heat retaining function can be exhibited in a wider range.
In a preferred embodiment of the present invention, the weight of the auxiliary sheet is 22 g / m ² , the specific volume is preferably 10 cm ³ / g or more, and the specific volume is preferably 16 cm ³ / g or more.
In yet another aspect, a plurality of auxiliary sheets may be laminated on the interior sheet, and a further heat retaining effect can be expected.
In yet another aspect, the auxiliary sheet may be disposed between the exterior sheet and the interior sheet.
In still another embodiment of the present invention, the nonwoven fabric constituting the auxiliary sheet may be subjected to a hydrophilic treatment.

Conventionally, a reinforcing sheet has been used to prevent diaper tearing and peeling of the side seal part when worn. In the pant-type absorbent article according to the present invention, such an auxiliary sheet has a heat retaining effect. Has been used to bring etc. The auxiliary sheet of the present invention contains 70% or more of heat-fusible fibers having a fiber diameter of 1.0 to 1.5 dtex or less by an air-through method with a basis weight of 22 g / m ² or more and a specific volume of 10 cm ^{3 /} g or more. Is formed. By comprising in this way, the paper diaper of this invention can acquire the heat retention equivalent to the paper diaper containing a far-infrared radiation mineral etc. Since this air-through nonwoven fabric can contain a large amount of air inside the nonwoven fabric, an excellent heat insulating effect can be obtained. In addition, since the fineness of the fibers is thin, the touch is smooth and a great effect is exhibited during use. By disposing such a non-woven fabric in an area where the wearer's body needs to be kept warm, it is effective in preventing cold and activating physiological functions. Furthermore, since the auxiliary sheet is not present at the periphery of the waist opening and the crotch part, it is possible to exert an effect that air permeability is good and stuffiness is less likely to occur.
Further, when the paper diaper of the present invention is manufactured, the paper diaper does not newly include a heating element or the like, so that it is not necessary to change the configuration of the diaper itself. In addition, in the manufacturing process, it is only necessary to stack the auxiliary sheet on the interior sheet, so that existing equipment can be used. Therefore, although the disposable diaper of the present invention can be easily manufactured at low cost, the performance of the function is equal to or higher than that using a heating element such as far-infrared radiation mineral.

  In the following, some preferred embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, the same reference numerals are used for the same components throughout the drawings.

  FIG. 1 is a schematic diagram showing a basic configuration of a complete pants-type diaper 10 according to the present invention. In the present invention, a perfect pants-type diaper is a diaper that is formed in a pant shape in advance so that both sides of the diaper are already sealed by various coupling methods and does not need to be fixed with a fixing tape or the like at the time of use. That means. Referring to FIG. 1, seal portions 12 are formed on both side portions of the diaper 10 to form a complete pants shape. The diaper 10 includes a front part 14 corresponding to the wearer's abdomen, a rear part 16 and a crotch part 18 corresponding to the back side. A plurality of elastic bodies 34 for waist gathers are formed across the front portion 14 and the rear portion 16 of the diaper 10 in order to form a gather in the waist region disposed at the periphery of the waist opening of the diaper. Furthermore, a plurality of elastic bodies 36 for forming gathers over the wearer's abdomen and waist are formed in the waistline region 11 in a state substantially parallel to the width direction of the diaper. Further, an elastic body 38 is provided in order to form a gather around the legs and prevent leakage of excrement and the like.

  FIG. 2 shows a longitudinal sectional view of the diaper along the line XX when the diaper of FIG. 1 is developed. The diaper 10 includes an absorbent main body 20 and a pants-shaped exterior body 28. The absorptive main body 20 is comprised from the top sheet 22, the leak-proof back seat | sheet 26, and the absorber 24 arrange | positioned among these. As can be seen with reference to FIG. 2, the absorbent main body 20 is positioned in the longitudinal direction at a substantially central portion of the diaper 10. The exterior body 28 that forms the outer shape of the pants-type diaper 10 includes an exterior sheet 30 and an interior sheet 32.

  The absorbent 24 may comprise any hydrophilic fiber matrix of a cellulose fluff web, such as a wood pulp fluff, mixed with particles of a superabsorbent material, commonly known as a superabsorbent material. Synthetic fibers or polymer fibers may be used instead of the wood pulp fluff. The superabsorbent particles may be mixed uniformly with the hydrophilic fibers or may be mixed non-uniformly. The mixing rate of the superabsorbent particles may be changed depending on the thickness of the absorber, and the mixing rate of the superabsorbent particles may be changed depending on the part of the absorber. The superabsorbent material is preferably in the form of discrete particles, but may have a variety of geometric shapes. The superabsorbent material may be contained in the absorber 24 in an amount of about 5 to 90% by weight with respect to the weight of the absorber 24.

  The leak-proof back sheet 26 is preferably formed of a material that is impermeable to liquid so as to provide a waterproof function so that liquid held in the absorber 24 does not leak into the underwear. Usually, such a liquid-impermeable leak-proof backsheet 26 can be manufactured from a thin plastic film such as a polyethylene film or another flexible liquid-impermeable material. Moreover, such a leak-proof back sheet 26 may be formed of a microporous air-permeable material so that liquid does not pass through while allowing vapor from the absorber to escape.

  In the pant diaper according to the present invention, the top sheet 22 is preferably made of a material that is liquid permeable and can be isolated from the liquid absorbed by the absorbent body 24 from the skin of the wearer. Specifically, the top sheet 22 is made of porous foam, reticulated foam, perforated plastic film, natural fiber such as wood or cotton fiber, synthetic fiber such as polyester or polypropylene fiber, or a combination of these. It may be formed from a nonwoven web material. However, the material of the topsheet 22 is not limited to these, and is a liquid permeable material that can isolate the wearer's skin from the liquid that is absorbed and retained by the absorber 24. It may be a non-woven fabric.

  Materials suitable for the elastic body formed around the waist and legs include a strand or ribbon made of a general elastomeric material, polyurethane, urethane thread rubber, flat rubber, synthetic rubber, natural rubber, elastic film, etc. . As a method for attaching these elastic bodies to the sheet, ultrasonic bonding may be performed as is known in the art, or bonding may be performed by a hot melt adhesive using various bonding patterns. It is preferable to join with an agent.

  The auxiliary sheet 40 covers the waist elastic member 36 from the position of the lower end of the plurality of waist gather elastic members 34 arranged at the waist peripheral edge to the longitudinal end of the absorbent main body 20, that is, the front and rear waist It is provided on the interior sheet 32 so as to cover the entire surrounding area 11. The auxiliary sheet 40 is preferably formed from an air-through nonwoven fabric. In FIG. 1, a region where the auxiliary sheet 40 is provided is illustrated as a halftone dot portion. In this specification, the air-through nonwoven fabric means a nonwoven fabric produced by an air-through manufacturing method. Such an air-through nonwoven fabric is generally characterized by having a bulky and soft texture because the fibers are bent and more complicatedly entangled because gentle and uniform heating with hot air is performed when the fibers are dried. Have

The auxiliary sheet 40 will be described in further detail. The non-woven fabric constituting the auxiliary sheet 40 is an air-through type non-woven fabric in which fibers having a fiber diameter of 70 to 70% or more having a fiber diameter of 1.0 to 1.5 dtex or less are formed by an air-through manufacturing method. Of course, when the fiber diameter is less than 1.0 dtex, it becomes difficult to mix and card in the nonwoven fabric manufacturing process. On the other hand, if the fiber diameter is larger than 1.5 dtex, the flexibility is lowered and the texture may be impaired. In the present invention, the basis weight of the air-through nonwoven fabric is preferably 22 g / m ² or more. In order to obtain a heat retaining effect, the specific volume of the air-through nonwoven fabric is preferably 10 cm ³ / g or more, and more preferably 16 cm ³ / g or more. Since the air-through nonwoven fabric of the present invention has a heat retaining effect, the nonwoven fabric may be further subjected to a hydrophilic treatment in consideration of absorption of perspiration when a user uses a diaper incorporating the nonwoven fabric. preferable.
The auxiliary sheet 40 is used not only in the waist area of the diaper but also in the area of the paper diaper that can cover the lower abdomen and back waist of the body, which is highly necessary for heat retention. can do. Further, the auxiliary sheet 40 can be disposed between the exterior sheet 30 and the interior sheet 32. Moreover, the auxiliary sheet 40 is not limited to a single sheet, and a plurality of auxiliary sheets 40 can be arranged and stacked to further enhance the heat retaining effect.

FIG. 3 is a cross-sectional view in the width direction of the crotch portion of the paper diaper of the present invention. The absorbent body 24 of the absorbent main body 20 in FIG. 3 is wrapped with an antibacterial deodorizing sheet 34. By wrapping the absorbent body 24 with the antibacterial deodorizing sheet 34, there is an effective effect that odor can be prevented from diffusing when excrement is absorbed during use. In FIG. 3, it is preferable that two absorbent bodies 24 are arranged in the absorbent main body 20 so as to overlap each other, and each of the absorbent bodies is preferably wrapped with an antibacterial deodorizing sheet. It may be wrapped only by a deodorizing sheet. As an example of the antibacterial deodorizing sheet, an antibacterial deodorizing sheet formed by adsorbing a metal such as silver or copper onto a zeolite mineral can be used. This sheet can deodorize malodor in a short time due to the adsorption performance of zeolite and reaction with metal ions, and has antibacterial activity against Escherichia coli, Salmonella, Staphylococcus aureus, MRSA, Pseudomonas aeruginosa and the like.
A transfer sheet is arranged between the top sheet 22 and the absorber 24. By the transfer sheet, the excrement can be easily moved from the top sheet 22 to the absorber 24, and the excretion absorption performance can be enhanced.

  FIG. 4 is a cross-sectional view in the width direction of the diaper of the waist region of the paper diaper of the present invention. Referring to FIG. 4, the auxiliary sheet 40, the interior sheet 32, and the exterior sheet 30 are laminated in this order from the side facing the body. However, the auxiliary sheet 40 may be disposed between the interior sheet 32 and the exterior sheet 30. That is, when the auxiliary sheet 40 is present on the body side in the entire waist region, it is possible to bring about advantageous effects such as a heat retaining effect and prevention of cooling at least on the waist of the wearer. Further, the auxiliary sheet 40 may be used by stacking a plurality of sheets instead of only one sheet.

  FIG. 5 schematically shows the manufacturing process of the disposable diaper according to the present invention. Referring to the figure, the auxiliary sheet 40 is supplied in the direction of the arrow Y in the region corresponding to the wearer's abdomen and back on the interior sheet 32 and the absorbent main body 20. The auxiliary sheet 40 is represented by a dot portion in FIG. 5, and is cut into a wavy shape 41 so as to cover the abdomen and the back as wide as possible. Thus, since the surface sheet 40 should just be laminated | stacked on an interior sheet in the area | region of the diaper corresponding to a wearer's front-back waist area, it is not necessary to change the structure of the diaper itself. For this reason, auxiliary sheet 40 can be given to a paper diaper, without performing design change of the facilities for existing paper diaper manufacture.

FIG. 6 shows the process of the stage following the process illustrated in FIG. 5 among the manufacturing processes of the pants according to the present invention. The exterior sheet, the interior sheet, the auxiliary sheet, and the auxiliary sheet obtained in the process of FIG. The laminated body composed of the absorbent main body is folded back and forth along the machine traveling direction. Next, side seals are sequentially applied to both sides of the paper diaper in the Z direction indicated by arrows, and then cut along the side seals. In this way, the disposable diaper 10 of the present invention is manufactured.
As mentioned above, the paper diaper which concerns on this invention can be obtained easily, without adding a special change to the manufacturing facility of the conventional paper diaper.

  FIG. 7 is a schematic view showing another example of the disposable diaper 10 ′ according to the present invention manufactured by the manufacturing process illustrated in FIGS. 5 and 6. An auxiliary sheet 40 is formed on the body-facing surface of the waist area 11 'of the diaper 10'. Compared with the auxiliary sheet area of the paper diaper 10 shown in FIG. The boundary line 41 is wavy.

表１において、製法ATは、エアースルー法を意味し、SBはスパンボンド法を意味する略語である。不織布の物性は、JISL1906に準じて測定した。比容積（ｃｍ³/ｇ）は、厚さ(mm）/目付け（ｇ/m²)×１０００を表す、素材コストは、比較例１の単価（\/ｍ²）を１０としたときの比を表す。 Example A pants-type disposable diaper using seven types of low-definition air-through nonwoven fabrics as auxiliary sheets according to the present invention was prepared and subjected to a wearing test. The paper diaper used for this test is the same as the diaper structure shown in FIGS. This test was carried out by measuring the skin surface temperature at the part in contact with the air-through nonwoven fabric before and after wearing the diaper of the present invention with a surface thermometer. Table 1 shows configurations of auxiliary sheets of seven kinds of low-fineness air-through nonwoven fabrics as Examples 1 to 7. The result is shown in the graph of FIG.
Comparative Example 1 uses an air-through nonwoven fabric generally used in absorbent articles as an auxiliary sheet, and Comparative Example 2 uses a polypropylene spunbond nonwoven fabric holding far-infrared radiation mineral as an auxiliary sheet. It is.
Table 1

In Table 1, production method AT means an air-through method, and SB is an abbreviation meaning a spunbond method. The physical properties of the nonwoven fabric were measured according to JISL1906. The specific volume (cm ³ / g) represents thickness (mm) / weight per unit area (g / m ² ) × 1000. The material cost is the ratio when the unit price (\ / m ² ) of Comparative Example 1 is 10. Represents.

When FIG. 8 is referred, each of the skin surface temperature when using the nonwoven fabric of Table 1 is represented with the graph. The temperature of the skin in contact with the non-woven fabric before wearing is 31.7 ° C. in both Examples 1 to 7 and Comparative Examples 1 and 2, and is the same. After wearing, the skin temperatures of Examples 1 to 7 and Comparative Example 2 are between 33.0 ° C. and 33.5 ° C. and can be said to be almost the same. Only Comparative Example 1 has a skin surface temperature of about 32.1 ° C., which is lower than the temperature after wearing Examples 1 to 7. Since Comparative Example 1 is a general air-through nonwoven fabric in an absorbent article, the heat retention effect is inferior compared to those containing many fibers with a thin fiber diameter employed in Examples 1 to 7 of the present application. Conceivable. In Comparative Example 2, it is considered that the skin surface temperature after wearing is 33.1 ° C., which is the same height as in the examples, because the far infrared radiation mineral is used for the spunbond nonwoven fabric. That is, the paper diaper having the configuration of the present invention shows that the effect is the same as or more than when using other heating elements such as far-infrared emitting minerals, or more. I can say that. In addition, the material cost in Comparative Example 2 is 4 to 3 times that in Examples 1 to 7. Regarding the cost, it can be seen that the disposable diaper of the present invention is much cheaper than Comparative Example 2.
As described above, the paper diaper of the present invention can be manufactured without changing the design of the existing equipment, so that it is possible to easily provide a paper diaper that exhibits a function equivalent to or higher than that when a heating element is used. is there.

  As described above, in the embodiments of the present invention, various dimensions, materials, and the like have been described. However, the present invention is not limited to these, and can be appropriately selected and adopted as long as it can be replaced.

It is the schematic showing the whole disposable paper diaper of this invention. FIG. 2 is a developed cross-sectional view in the longitudinal direction of the pants along the line XX in FIG. 1. It is sectional drawing of the crotch part of the paper diaper of this invention. It is sectional drawing of the width direction of pants. It is the schematic which shows a part of manufacturing process of the paper diaper of this invention, and shows the step in which an auxiliary sheet is supplied on the surface sheet of a paper diaper. It is the schematic which shows a part of manufacturing process of the paper diaper of this invention, and shows the step cut | disconnected after a side part seal. It is the schematic of the paper diaper manufactured by the process illustrated in FIG. It is a graph showing the skin surface temperature before and behind use of the Example and comparative example of the paper diaper which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Pants-type diaper 11 Trunk circumference area 20 Absorbent main body 22 Surface sheet 24 Absorber 28 Exterior body 30 Exterior sheet 32 Interior sheet 40 Auxiliary sheet

Claims (9)

A pants-type absorbent article,
An absorptive main body comprising a top sheet, a back sheet, and an absorbent body disposed therebetween, an exterior sheet constituting the outer shape of the article, and an interior provided on the body side with respect to the exterior sheet It includes a Ranaru exterior body Toka sheet, wherein the article has a crotch region in which the absorbent body and the front and rear waist regions are disposed corresponding to the abdomen and waist of the wearer,
In the front-rear waist region, at least one auxiliary sheet is laminated on the body side with respect to the exterior sheet , and the auxiliary sheet has at least 70 fibers with a fiber diameter of 1.0 to 1.5 dtex or less. A pant-type absorbent article, characterized in that it is formed from an air-through non-woven fabric comprising heat-bonded fibers.   2. The absorbent article according to claim 1, wherein a plurality of waist gather elastic bodies are formed on a periphery of a waist opening of the article, and the auxiliary sheet is formed from a lower end of the waist gather elastic body. The absorbent article is provided in a region between the end of the absorbent main body in the longitudinal direction of the diaper. The absorbent article of claim 1, wherein the auxiliary sheet, an absorbent, characterized in that it is intended to be arranged to cover wide need highly abdomen and / or back waist warmth Goods.   The absorbent article according to any one of claims 1 to 3, wherein the auxiliary sheet has a wavy shape. 5. The absorbent article according to claim 1, wherein the weight of the auxiliary sheet is 22 g / m ² or more and the specific volume is 10 cm ³ / g or more. . The absorbent article according to any one of claims 1 to 4, wherein the weight of the auxiliary sheet is 22 g / m ² or more and the specific volume is 16 cm ³ / g or more. . The absorbent article according to any one of claims 1 to 6, the auxiliary sheet, the absorbent article characterized in that it is laminated several sheets double. It is an absorbent article in any one of Claim 1 to 6, Comprising: The said auxiliary sheet is arrange | positioned between the said exterior sheet and the said interior sheet , or the body side with respect to the said interior sheet. Absorbent article.   The absorbent article according to any one of claims 1 to 8, wherein the nonwoven fabric constituting the auxiliary sheet is hydrophilized.

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