JP2008212232A - Pants type disposable diaper and manufacturing method of sheet used therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pants type disposable diaper capable of facilitating diaper attaching and detaching work and improving the texture of a shirring part around the waist without obstructing flexible force by an elastic flexible member of the shirring part around the waist. <P>SOLUTION: The pants type disposable diaper includes: an absorbable main body 10 for which an absorbent 12 is interposed between a liquid permeable top sheet 11 and a leakage prevention sheet 19 and a back surface sheet 14 composed of a nonwoven fabric is disposed to an outermost layer; a sheet 20 for a back body for which the elastic flexible member is arranged between two nonwoven fabrics 21A and 21B and which is bonded to the back body side of the absorbable main body 10; and a sheet 30 for a front body for which the elastic flexible member is arranged between two nonwoven fabrics 31A and 31B and which is bonded to the front body side of the absorbable main body 10. The nonwoven fabrics constituting the two nonwoven fabrics 21A and 21B constituting the sheet 20 for the back body, the two nonwoven fabrics 31A and 31B constituting the sheet 30 for the front body and the back surface sheet 14 are arranged so as to have the fiber orientation in the roughly longitudinal direction of the diaper. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pants-type disposable diaper that has increased strength in the longitudinal direction of the diaper and has extensibility in the diaper width direction, and a method for producing a sheet used therefor.

  Conventionally, in a pants-type disposable diaper, a nonwoven fabric is often used as a material constituting the top sheet and the back sheet. In non-woven fabrics, fiber orientation affects the strength properties and elongation direction of the material. For example, when fiber orientation is applied in one direction, the fiber orientation direction has strength and the extensibility becomes extremely low, whereas the direction orthogonal to the fiber orientation direction has low strength and extensibility. It has the feature of becoming higher. In recent years, various developments have been made to make nonwoven fabrics having high extensibility regardless of fiber orientation (for example, Patent Documents 1 to 3 below).

  By the way, when the nonwoven fabric which has a fiber orientation in one direction is manufactured, generally a fiber orientation comes to be made along the manufacturing line of a nonwoven fabric, ie, the longitudinal direction of a nonwoven fabric original fabric.

  On the other hand, in a pants-type disposable diaper, an elastic elastic member is bonded between non-woven fabrics along the diaper width direction around the trunk from the viewpoint of preventing slippage during use, and a shirring portion around the trunk is formed.

  In the manufacturing process of the conventional pants-type disposable diaper 70, as shown in FIG. 15, between the upper nonwoven fabric 72 and the lower nonwoven fabric 73 made of a continuous web sheet, the stretched state is along the flow direction A of the production line. An elastic elastic member stretched along the flow direction A of the production line between a continuous rear body sheet 71 on which an elastic elastic member 74 is arranged, and an upper nonwoven fabric 76 and a lower nonwoven fabric 77 made of a continuous web sheet. 78 is supplied in a state of being separated from the continuous front body sheet 75 in which the body 78 is disposed, and the absorbent main body 79 is bridged between the back body sheet 71 and the front body sheet 75, It is fixed at the overlapping portion (see, for example, Patent Document 4 below). As described above, when using a nonwoven fabric with fiber orientation in the longitudinal direction of the original fabric, the nonwoven fabric and the elastic elastic member are supplied and bonded along the diaper production line. As shown in FIG. 16, the fiber orientation of the nonwoven fabric was in the direction along the diaper production line, ie, the diaper width direction, which is the arrangement direction of the elastic stretchable member.

  On the other hand, a general pants-type disposable diaper has a joint opening formed on both sides by joining both sides of the front body and both sides of the back body, and a trunk opening and a pair of left and right leg openings. And an absorbent body that passes through the crotch from the abdominal side to the crotch along the center in the width direction of the inside and is fixed to the back side. It is worn by inserting it into the leg opening through the trunk opening.

  In contrast to the type using such an integrated exterior sheet, in recent years, the exterior sheet is divided into two parts, the abdomen and the back, and the abdomen exterior sheet and the back exterior sheet are separated without being continuous on the crotch side. A paper diaper that can be called a two-divided type has been proposed (see, for example, Patent Document 5 below). The absorbent main body is a liquid-permeable top sheet disposed on the front surface, a liquid-impermeable sheet disposed on the back side (leak-proof film), and an absorbent element that absorbs and holds the liquid disposed therebetween. In many cases, the outer surface (outermost layer) of the liquid-impermeable sheet is covered with a nonwoven fabric sheet. The back side of the absorbent main body is connected to the inner surface in the center in the width direction of the abdominal exterior sheet at the front end, and the middle part between the front end and the rear end is the abdominal exterior sheet and the back exterior on the crotch side. It is exposed to the outer surface from the part separated from the sheet.

In the 2-split type, there are few trims (excess waste parts) when punching out the leg openings at the time of manufacture, each material of the abdominal exterior sheet and the back exterior sheet can be selected individually, and the exterior sheet is in the crotch Since it does not exist, there are advantages such as excellent breathability and easy movement of the legs.
JP-A-9-59862 Japanese Patent Laid-Open No. 2000-119946 JP 2001-3253 A Japanese Patent Laying-Open No. 2005-279077 JP 2005-27839 A

  However, as described above, in the conventional pants-type disposable diaper 70, as shown in FIG. 16, when a nonwoven fabric having fiber orientation in one direction is used, the fiber orientation is in the diaper width direction. For this reason, the nonwoven fabric sheet material of the pants-type disposable diaper has strength in the diaper width direction which is the fiber orientation of the nonwoven fabric, and has a very low extensibility, whereas the diaper longitudinal direction is perpendicular to the fiber orientation of the nonwoven fabric. The direction had the properties of low strength and high extensibility. In such a diaper, since the nonwoven fabric sheet material hinders the extension of the shirring portion around the trunk in the circumferential direction, the diaper is inconvenient because of resistance when the diaper is attached and detached.

  Further, in the shirring portion around the waist, a crease is formed in the nonwoven fabric sheet material due to the contraction force of the elastic elastic member, and this crease becomes a wave shape along the fiber orientation of the nonwoven fabric sheet material. Due to the bending resistance of each book, each crease became a large wave, and the feeling of touch was bad.

  Furthermore, since the nonwoven fabric sheet material is easily stretched in the longitudinal direction of the diaper, there is a problem that the nonwoven fabric sheet material is stretched due to the movement of the legs when the diaper is used, and the diaper falls off.

  Therefore, the main problem of the present invention is that the fiber orientation of the nonwoven fabric sheet material is in the diaper longitudinal direction, so that the elastic force of the elastic shirring part of the waistline shirring part is not hindered, and the diaper attaching / detaching work is facilitated. An object of the present invention is to provide a pant-type disposable diaper with improved fit and a method for producing a sheet used therefor, which improves the feel of the shirring portion around the waist and eliminates diaper slippage when wearing the diaper.

In order to solve the above-mentioned problem, as the present invention according to claim 1, an absorbent body is interposed between a liquid-permeable top sheet and a liquid-impervious sheet, and a back sheet made of a nonwoven fabric is disposed in the outermost layer. A sheet for the back body, in which a large number of elastic elastic members are disposed along the waist portion and the waistline portion between the absorbent main body provided and the two nonwoven fabrics, and joined to the back body side of the absorbent main body; A large number of elastic elastic members are disposed between the two nonwoven fabrics along the waist and the waist, and the front body sheet is joined to the front body side of the absorbent main body. In the pants-type disposable diaper in which the waist opening and the pair of left and right leg openings are formed by joining the sheet for the back body and the sheet for the front body in the state at the joining edge portions on both side ends thereof,
The two nonwoven fabrics constituting the back body sheet and the two nonwoven fabrics constituting the front body sheet are arranged so as to have fiber orientation in a substantially longitudinal direction of the diaper,
A pants-type disposable diaper is provided in which the nonwoven fabric constituting the back sheet is disposed so as to have fiber orientation in a substantially longitudinal direction of the diaper.

  The present invention according to claim 1 is an embodiment in which the back body sheet is joined to the back body side of the absorbent main body and the front body sheet is joined to the front body side.

  In such an embodiment, the two nonwoven fabrics constituting the back body sheet and the two nonwoven fabrics constituting the front body sheet are arranged so as to have fiber orientation in the substantially longitudinal direction of the diaper. The non-woven fabric is formed by shrinkage of the elastic elastic member while improving the extensibility of the non-woven fabric in the width direction of the diaper, not obstructing the elastic force of the elastic elastic member of the shirring portion around the waist, and facilitating the operation when attaching and detaching the diaper The folds are subdivided to improve the feeling of touch.

  Furthermore, since the nonwoven fabric which comprises the said back surface sheet is arrange | positioned so that it may have fiber orientation in the substantially longitudinal direction of a diaper, since the intensity | strength with respect to the diaper longitudinal direction of a nonwoven fabric increases, elongation in a longitudinal direction is restrict | limited. When wearing a diaper, there will be no slippage and the fit will be maintained.

As the present invention according to claim 2, an absorbent main body including an absorbent body, and a waist portion on the front body side and the rear body side between the two nonwoven fabrics, which are integrally provided on the outer surface side of the absorbent main body And an exterior sheet in which elastic elastic members are respectively arranged along the waist part, and the rear body and the front body of the exterior sheet are joined at the joining edge portions at both side ends in the product state. In a pants-type disposable diaper in which a waist opening and a pair of left and right leg openings are formed,
A pants-type disposable diaper is provided in which at least two nonwoven fabrics constituting the exterior sheet are arranged so as to have fiber orientation in a substantially longitudinal direction of the diaper.

  The present invention according to claim 2 is an embodiment in which an exterior sheet is integrally joined to the outer surface side of the absorbent main body. In this embodiment, since at least two nonwoven fabrics constituting the exterior sheet are arranged so as to have fiber orientation in the substantially longitudinal direction of the diaper, a reduction in the stretching force due to the elastic stretching member of the shirring around the waist is prevented. In addition, the feel of the shirring portion around the waist is improved, and the diaper can be fitted with excellent fit.

  According to a third aspect of the present invention, in the front body sheet and / or the rear body sheet, the elastic elastic member is cut and discontinuous in the region overlapping the absorber. The described pants-type disposable diaper is provided.

  In the invention according to claim 3, in the front body sheet and / or the back body sheet, the elastic elastic member is cut and discontinuous in the region overlapping the absorber. This is to prevent the elastic body from contracting due to the elastic stretching force.

  As the present invention according to claim 4, the non-woven fabric constituting the front body sheet, the back body sheet or the exterior sheet is a non-woven fabric manufactured by a spunbond method. Diapers are provided.

  Examples of the nonwoven fabric having fiber orientation in one direction include a spunbond nonwoven fabric, an air-through nonwoven fabric, a meltblown nonwoven fabric, and SMS (spunbond / meltblown / spunbond). desirable.

The present invention according to claims 5 and 6 is a specific method for producing a nonwoven fabric having fiber orientation in the substantially longitudinal direction of the diaper according to any one of claims 1 to 4 and interposing an elastic elastic member. Is shown. In particular,
The present invention according to claim 5 is a method for producing a front body sheet, a back body sheet or an exterior sheet used in the pants-type disposable paper diaper according to any one of claims 1 to 4,
From the nonwoven fabric supply line on one side, a nonwoven fabric having fiber orientation in the longitudinal direction of the original fabric is supplied along the line and cut at a predetermined interval, and then reversed by a 90 ° reversing device, almost perpendicular to the line The non-woven fabric connection body in which the non-woven fabric is connected and arranged is supplied, and the non-woven fabric connection body connected in the same manner is supplied from the non-woven fabric supply line of the non-woven fabric connection body. Production of a sheet for a pants-type disposable diaper, wherein a plurality of elastic elastic members are continuously bonded in a stretched state to portions corresponding to a waist portion and a waist portion, and then cut into a predetermined shape A method is provided.

  The present invention according to claim 5 shows a first embodiment for manufacturing a sheet in which an elastic elastic member is arranged along a waist portion and a waist portion between two nonwoven fabrics. is there.

  In the present invention according to the fifth aspect, after the nonwoven fabric having fiber orientation in the longitudinal direction of the original fabric is supplied along the line and cut at a predetermined interval, the nonwoven fabric is reversed by a 90 ° reversing device to be almost the same as the line. By having the fiber orientation in the orthogonal direction, when the elastic elastic member is bonded along the production line, the fiber orientation is obtained in the diaper longitudinal direction.

The present invention according to claim 6 is a method for manufacturing a front body sheet, a back body sheet or an exterior sheet used in the pants-type disposable paper diaper according to any one of claims 1 to 4,
A plurality of elastic elastic members are supplied in a stretched state along the production line, and a non-woven fabric having fiber orientation in the longitudinal direction of the original fabric is spirally supplied so as to be wound around the elastic elastic member group. Then, the manufacturing method of the sheet | seat for underpants type disposable diapers characterized by cut | disconnecting to a predetermined shape is provided.

  The present invention according to claim 6 shows a second embodiment for manufacturing a sheet in which an elastic elastic member is arranged along a waist portion and a waist portion between two nonwoven fabrics. is there. In this embodiment, the non-woven fabric having fiber orientation in the longitudinal direction of the original fabric is spirally fed and stacked into a sheet shape so as to be wound around the stretched elastic elastic member group, and then cut into a predetermined shape. This makes it possible to produce a sheet having fiber orientation in the longitudinal direction of the diaper.

  As described above in detail, according to the present invention, by making the fiber orientation of the nonwoven fabric sheet material the longitudinal direction of the diaper, without inhibiting the elastic force of the elastic elastic member of the waistline shirring portion, facilitating the diaper attaching / detaching operation, The feeling of touch of the shirring part around the trunk is improved. Furthermore, it can be set as the underpants type disposable diaper which lost the gap of the diaper at the time of diaper wear, and was excellent in fit nature.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1-7 has shown an example of the underpants type disposable diaper 1 (henceforth only a diaper) which concerns on this invention. 1 to 7, the “longitudinal direction” means a direction connecting the belly side and the back side of the diaper, and the “width direction” means a direction orthogonal to the longitudinal direction.

  The diaper 1 includes an absorbent main body 10 in which an absorbent body 12 is interposed between a liquid-permeable top sheet 11 and a leak-proof sheet 19, and a back sheet 14 made of a nonwoven fabric is disposed in the outermost layer. A large number of elastic elastic members 22, 22... Are arranged along the waist portion S1 between two nonwoven fabrics (upper nonwoven fabric 21A, lower layer nonwoven fabric 21B), and a large number of elastic elastic members along the waist portion S2. 23, 23... Are arranged to form a shearing portion, and between the back body sheet 20 joined to the back body B side of the absorbent main body 10 and the two non-woven fabrics (upper layer non-woven fabric 31A, lower layer non-woven fabric 31B) Are arranged along the waist part S1 and a plurality of elastic elastic members 33, 33 are arranged along the waist part S2, and the front body of the absorbent main body 10 is disposed. F side And a body sheet 30. Before being joined.

  In the product state, as shown in FIG. 5 and FIG. 6, the rear body sheet 20 and the front body sheet 30 are joined at the joining edges 24, 24 on both side ends thereof, so that a waist opening is formed. In addition, a pair of left and right leg openings are formed.

  As shown in FIG. 3, the absorbent main body 10 includes a liquid-permeable top sheet 11 made of a perforated or non-porous nonwoven fabric, a perforated plastic sheet, and the like and covering the use surface side, and a cotton diaper on the outer surface side of the diaper. For example, a rectangular shape (or hourglass shape, etc.) having a certain degree of rigidity and an outer surface of the absorbent body 12 so as to cover at least the entire area of the absorbent body 12 The sheet 19 is composed of a side gather nonwoven fabric 13 for forming a three-dimensional gather BS standing on the surface side on both sides around the leg of the diaper, and a nonwoven fabric forming the outermost layer disposed on the outer surface side of the leakproof sheet 19. It is mainly composed of the back sheet 14.

  As shown in FIGS. 1 and 2, the rear body sheet 20 includes two upper-layer nonwoven fabrics 21 </ b> A and lower-layer nonwoven fabrics 21 </ b> B made of a nonwoven fabric, and a waist portion S <b> 1 and a waist portion S <b> 2 in the diaper width direction therebetween. It is mainly composed of a large number of elastic elastic member groups 22, 22..., 23, 23.

  As shown in FIGS. 1 and 2, the front body sheet 30 includes two upper-layer nonwoven fabrics 31 </ b> A and lower-layer nonwoven fabrics 31 </ b> B made of a nonwoven fabric, and a waist portion S <b> 1 and a waist portion S <b> 2 in the diaper width direction therebetween. It is mainly composed of a large number of elastic elastic member groups 32, 32,.

  In the present invention, in particular, the two nonwoven fabrics 21A and 21B constituting the back body sheet 20 and the two nonwoven fabrics 31A and 31B constituting the front body sheet 30 have fiber orientation in a substantially longitudinal direction of the diaper. The non-woven fabric constituting the back sheet 14 is arranged so as to have fiber orientation in the substantially longitudinal direction of the diaper.

  Here, the nonwoven fabric “having fiber orientation in the substantially longitudinal direction of the diaper” means that 50% or more of the total fiber weight constituting the nonwoven fabric is fiber oriented in the longitudinal direction of the diaper. Means a fiber orientation in the range of −45 ° to + 45 ° with respect to the longitudinal direction of the diaper.

  The measurement method generally used can be used for the measuring method of the fiber orientation of a nonwoven fabric. For example, it can be set as the measuring method according to the fiber orientation test method by the zero distance tensile strength of TAPPI standard method T481.

  Further, as a simple method, the fiber orientation may be measured from the tensile strength ratio (MD / CD) between the production line direction (MD) of the nonwoven fabric and its orthogonal direction (CD). As a specific procedure of the simple measurement method, using a SHIMADZU autograph (AGS-G100N) tester, a test piece with a length of 200 mm and a width of 50 mm, a crosshead speed of 500 mm / min, and between chucks The test is performed under the condition of a distance of 150 mm, the tensile strength is obtained from the maximum load at the time of tension, and the elongation is calculated from the elongation at the maximum load. If the ratio of tensile strength (MD / CD) is greater than 1, it can be said that the nonwoven fabric has fiber orientation in the MD direction.

  In the present invention, it is desirable to use a nonwoven fabric having a tensile strength ratio (MD / CD) of 1.5 or more, more preferably 2.0 or more in the simple method. The said tensile strength is 20-80 (N / 50mm) about MD direction, Preferably it is 30-60 (N / 50mm), More preferably, it is 35-50 (N / 50mm). The CD direction is 5 to 40 (N / 50 mm), preferably 5 to 25 (N / 50 mm), and more preferably 7.5 to 20 (N / 50 mm). The tensile elongation in the CD direction is 50% or more, preferably 80% or more, and the tensile elongation ratio (MD / CD) is 0.9 or less, preferably 0.8 or less. Furthermore, the fineness is desirably 1.0 to 4.0 dtex. In addition, the MD direction and the CD direction are directions on the raw fabric of the nonwoven fabric.

  Among the commercially available nonwoven fabrics having orientation in one direction, the tensile strength (N / 50 mm) (MD and CD directions) for a plurality of types of nonwoven fabrics that can be suitably used for the disposable paper diaper according to the present invention. In addition, the tensile strength ratio (MD / CD) and the tensile elongation (%) (MD and CD directions) and the tensile elongation ratio (MD / CD) were investigated. The results are shown in Table 1 below.

  Hereinafter, the absorbent main body 10, the back body sheet 20, and the front body sheet 30 will be described in detail.

[Structure of Absorbent Body 10]
First, an example of the structure of the absorbent main body 10 will be described in detail with reference to FIG.

  As described above, the absorbent main body 10 has an absorbent body 12 such as cotton pulp between the liquid-permeable top sheet 11 made of a nonwoven fabric and the liquid-impermeable leak-proof sheet 19 made of a plastic sheet. It has an intervening structure, and a back sheet 14 made of a nonwoven fabric is disposed on the outermost layer.

  In the example shown in FIG. 1, the absorbent body 12 is formed so that the planar shape is a substantially rectangular shape (or an hourglass shape, etc.), and the width dimension of the absorbent body is attached to the wearer by hitting the crotch portion. Dimension width that does not give a feeling. The absorbent body 12 is surrounded by crepe paper 16 in order to maintain the shape and improve the diffusibility of the body fluid that has passed through the liquid-permeable surface sheet 11. The crepe paper 16 can be omitted. Furthermore, in the illustrated embodiment, a holding sheet 17 is provided between the crepe paper 16 and the rear surface side portion (lower part) of the absorber 12, but the holding sheet 17 may be omitted.

Further, a hydrophilic intermediate sheet (second sheet) 18 can be provided between the top sheet 11 and the absorber 12 in order to quickly transfer the liquid that has passed through the top sheet 11 to the absorber 12. In addition, although not shown in figure, each structural member of the absorptive main body 10 can be mutually fixed by solid, beads, spiral application | coating, etc., such as a hot-melt-adhesive agent.
(Absorber 12)
The absorbent body 12 can be made of a bundle of short fibers such as cotton-like pulp, or can be made of an aggregate of filaments 12a, 12a.

  The aggregate of the filaments 12a, 12a... Can be obtained by opening a tow (fiber bundle). Examples of tow fibers include polysaccharides or derivatives thereof (cellulose, cellulose ester, chitin, chitosan, etc.), synthetic polymers (polyethylene, polypropylene, polyamide, polyester, polylactamamide, polyvinyl acetate, etc.). In particular, cellulose esters and cellulose are preferable.

  As cellulose, cellulose derived from plants such as cotton, linter, and wood pulp, bacterial cellulose, and the like can be used. Regenerated cellulose such as rayon may be used, and the regenerated cellulose may be a spun fiber.

  Examples of the cellulose ester that can be suitably used include organic acid esters such as cellulose acetate, cellulose petitate, and cellulose propionate; mixed acid esters such as cellulose acetate propionate, cellulose acetate petitate, cellulose acetate phthalate, and cellulose nitrate acetate. And cellulose ester derivatives such as polycaprolactone-grafted cellulose ester can be used. These cellulose esters can be used alone or in admixture of two or more. The viscosity average degree of polymerization of the cellulose ester is, for example, about 50 to 900, preferably about 200 to 800. The average substitution degree of the cellulose ester is, for example, about 1.5 to 3.0 (for example, 2 to 3).

  The average degree of polymerization of the cellulose ester can be, for example, 10 to 1000, preferably 50 to 900, more preferably about 200 to 800, and the average degree of substitution of the cellulose ester is, for example, about 1 to 3, preferably 1 to 1. 2.15, more preferably about 1.1 to 2.0. The average degree of substitution of the cellulose ester can be selected from the viewpoint of enhancing biodegradability.

  As the cellulose ester, an organic acid ester (for example, an ester with an organic acid having about 2 to 4 carbon atoms), particularly cellulose acetate is suitable. The degree of acetylation of cellulose acetate is often about 43 to 62%, but about 30 to 50% is particularly preferable because it is excellent in biodegradability. A particularly preferred cellulose ester is cellulose diacetate.

  The tow constituent fiber may contain various additives such as a heat stabilizer, a colorant, an oil agent, a yield improver, a whiteness improver, and the like.

  The fineness of the tow constituting fiber is, for example, 1 to 16 denier, preferably 1 to 10 denier, and more preferably 1 to 6 denier. The tow constituent fiber 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. When crimped fibers are used, a bulky and light absorbent body can be produced, and a tow with high unity can be easily produced by entanglement between the fibers. The cross-sectional shape of the tow constituting fiber is not particularly limited, and may be any one of, for example, a circular shape, an oval shape, an irregular shape (for example, a Y shape, an X shape, an I shape, an R shape) or a hollow shape. Also good. The tow constituting fibers are used in the form of tows (fiber bundles) formed by bundling, for example, about 1,000 to 1,000,000, preferably about 2,000 to 1,000,000 single fibers. can do. The fiber bundle is preferably formed by bundling about 1,000 to 1,000,000 continuous fibers.

Cellulose diacetate tow bales that can be suitably used in the present invention are commercially available from Celanese and Daicel Chemical Industries. Cellulose diacetate tow bale has a density of about 0.5 g / cm ³ and a total weight of 400-600 kg. From this bale, the tow is peeled off and spread into a wide band so as to have a desired size and bulk. The opening width of the tow is arbitrary, and can be, for example, a width of 50 to 2000 mm, preferably about 50 to 300 mm, which is the width of the product absorber. Moreover, the density of an absorber can be adjusted by adjusting the degree of tow opening.

  Preferably, as shown in FIG. 3, superabsorbent polymer particles 12 b, 12 b. And at least in the liquid receiving region, it is desirable that the superabsorbent polymer particles (SAP particles) are dispersed substantially throughout the thickness direction with respect to the aggregate of the filaments 12a, 12a. The state of being substantially dispersed throughout the thickness direction is conceptually shown as an enlarged view of the main part of FIG.

  When there is no SAP particle in the upper part, the lower part, and the middle part of the absorber 12, or there are very few, it cannot be said that it is "dispersed in the whole thickness direction". Therefore, “distributed throughout the thickness direction” means “distributed unevenly” in the upper, lower and / or middle portions of the aggregate of filaments, in addition to the form “uniformly” distributed throughout the thickness direction. However, it is still included in the form of being dispersed in the upper, lower and middle portions. In addition, a form in which some SAP particles do not penetrate into the aggregate of the filaments 12a, 12a... Remain on the surface, or some SAP particles pass through the aggregate of the filaments 12a, 12a. The form on 16 and the form on holding sheet 17 are not excluded.

(Superabsorbent polymer particles 12b)
The superabsorbent polymer particles 12b include “powder” in addition to “particles”. As the particle diameter of the superabsorbent polymer particles 12b, those used for 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 12b can be used without any particular limitation, but those having a water absorption of 40 g / g or more are suitable. Examples of the superabsorbent polymer particles 12b include starch-based, cellulose-based and synthetic polymer-based polymers such as starch-acrylic acid (salt) graft copolymer, saponified starch-acrylonitrile copolymer, and sodium carboxymethylcellulose. A cross-linked product or an acrylic acid (salt) polymer can be used. As the shape of the superabsorbent polymer particles 12b, a commonly used granular material is suitable, but other shapes can also be used.

  As the superabsorbent polymer particles 12b, those having a water absorption rate of 40 seconds or less are preferably used. When the water absorption speed exceeds 40 seconds, so-called reversal that the liquid supplied into the absorber 12 returns to the outside of the absorber 12 is likely to occur.

  Moreover, as the superabsorbent polymer particles 12b, 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 12, the sticky feeling after liquid absorption can be suppressed effectively.

The basis weight of the superabsorbent polymer particles 12b can be appropriately determined according to the amount of absorption required for the application of the absorber 12. Therefore, although it cannot be said unconditionally, it can be set to 50 to 350 g / m ² . If the basis weight of the polymer is less than 50 g / m ^2, it is difficult to secure the absorption amount. When it exceeds 350 g / m ² , not only the effect is saturated, but also the sensation of incongruity due to the excess of the superabsorbent polymer particles 12b is given.

  If necessary, the superabsorbent polymer particles 12b can adjust the spray density or spray amount in the plane direction of the absorber 12. 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 12 can also be provided.

  If necessary, as the superabsorbent polymer particles 12b, a plurality of particles having different particle size distributions are prepared, sequentially supplied in the thickness direction, and the particles having a small particle size distribution on the lower side in the absorber 12 and the particle size distribution on the upper side. Can be distributed.

  The ratio between the superabsorbent polymer particles 12b and the continuous fibers affects the absorption characteristics. As a weight ratio in a planar area of 5 cm × 5 cm in a region directly receiving the liquid in the absorbent body 12, it is desirable that the superabsorbent polymer particle / continuous fiber weight is 1 to 14, particularly 2 to 9.

(Top sheet 11)
As the liquid-permeable top sheet 11 covering the surface side (skin contact surface side) of the absorbent body 12, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used. The material fibers that make up the nonwoven fabric can be synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, and polyamides, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Of these processing methods, the spunlace method is excellent in terms of flexibility and the spunbond method is excellent in drapeability, and the thermal bond method and the air-through method are excellent in terms of being bulky and soft. When a large number of through holes are formed in the liquid permeable top sheet 11, urine and the like are quickly absorbed, and the dry touch property is excellent. The liquid-permeable top sheet 11 extends to the back surface side of the absorbent body 12 around the side edge of the absorbent body 12.

  Moreover, the top sheet 11 may be composed of a single sheet or may be composed of a laminated sheet obtained by bonding two or more sheets. Similarly, the top sheet 11 may be composed of one sheet or two or more sheets in the planar direction.

(Leakproof sheet 19)
The leak-proof sheet 19 that covers the back surface side (non-skin contact surface side) of the absorbent body 12 is made of a liquid-impervious plastic sheet such as polyethylene or polypropylene, but in recent years has moisture permeability from the viewpoint of preventing stuffiness. Those are preferably used. This water-impervious / breathable sheet is a microporous sheet obtained by, for example, melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. If the sheet thickness is the same, the rigidity is lower than that of the non-porous sheet, which is superior in terms of flexibility.

  The leak-proof sheet 19 can prevent the liquid from leaking laterally by extending it to the use surface in a so-called framed form (not shown), but in the embodiment, the lateral leak is a three-dimensional gather BS. This is prevented by interposing the second leak-proof sheet 19a between the double gathered nonwoven fabrics 13 that form the layer. According to this embodiment, since the second leak-proof sheet 19a extends until the three-dimensional gather BS stands up, the liquid that has spread laterally through the top sheet 11 and the side leakage of soft stool between the three-dimensional gather BS and BS are prevented. There is also an advantage that can be prevented.

  Further, the inner surface or the outer surface of the leak-proof sheet 19 may be designed by printing or coloring. Furthermore, a printed or colored design sheet, which is a separate member from the back sheet, may be attached to the outside of the leak-proof sheet 19. Moreover, you may provide the indicator which displays urination by visual change inside the leak-proof sheet | seat 19. As shown in FIG.

(Gathered nonwoven fabric 13)
On the other hand, as shown in FIG. 3, the gathered nonwoven fabric 13 forming the three-dimensional gathered BS is a nonwoven fabric made into a double sheet by folding, and the side edges of the absorbent body 12 wound by the topsheet 11 are further It winds up from the upper side and extends to the back side of the absorbent body 12 to be bonded. More specifically, the gathered nonwoven fabric 13 has a three-dimensional gather BS forming portion left in the middle portion in the longitudinal direction of the paper diaper, and a range from the middle portion in the width direction to the back side of the absorbent body 12 is bonded by a hot melt adhesive or the like. Further, at the front and rear end portions in the longitudinal direction, the section from the intermediate portion in the width direction to the one side end edge is bonded in the range extending to the back surface side of the absorber 12, and the portion forming the three-dimensional gather BS is the absorber. 12 is bonded by a hot melt adhesive or the like while being folded at the upper surface portion.

  Inside the gathered nonwoven fabric 13 formed of the double sheet nonwoven fabric, a plurality of thread-like elastic elastic members 15, 15... The thread-like elastic stretch members 15, 15... Are for forming a three-dimensional gather BS by raising a nonwoven fabric portion protruding from the absorber side edge portion by elastic stretch force in a product state. In the present invention, since the absorbent main body 10, the back body sheet 20 and the front body sheet 30 are manufactured in separate steps and then joined, the absorbent main body 10 is always provided with the elastic elastic member. The production line can be conveyed along the arrangement direction of 15, 15,..., And the operation such as rotating in the orthogonal direction is not necessary, and the production operation can be simplified.

As the thread-like elastic elastic member 15, materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, and polyester that are usually used can be used. In order to make it difficult to see from the outside, it is preferable that the thickness is 925 dtex or less, the tension is 150 to 350%, and the interval is 7.0 mm or less. Instead of the thread-like elastic elastic member, a tape-like elastic elastic member having a certain width may be used.
In the same manner as the liquid-permeable surface sheet 11, the material fiber constituting the gathered nonwoven fabric 13 is not limited to synthetic fibers such as polyethylene or polypropylene, such as olefins, polyesters, and polyamides, but also regenerated fibers such as rayon and cupra, Non-woven fabric obtained by an appropriate processing method such as a spunbond method, a thermal bond method, a melt blown method, a needle punch method, etc. can be used. It is preferable to use a non-woven fabric with a low basis weight and excellent air permeability. Furthermore, with respect to the gathered nonwoven fabric 13, in order to prevent the transmission of urine and the like, to prevent fogging, and to improve the touch to the skin (dry feeling), a silicon-based, paraffin-metal-based, alkylchromic-chromoid water repellent It is desirable to use a water-repellent non-woven fabric coated with such as.

(Crepe paper 16)
When the crepe paper 16 is used, as the material, tissue paper, particularly crepe paper, non-woven fabric, polylaminated non-woven fabric, a sheet having small holes, or 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 SMMS (spunbond / meltblown / meltblown / spunbond) nonwoven fabric is particularly suitable, and polypropylene, polyethylene / polypropylene, etc. can be used as the material. The basis weight is preferably 5 to 40 g / m ² , particularly 10 to 30 g / m ² .

  As shown in FIG. 3, the crepe paper 16 wraps only the back surface and side surfaces of the continuous fiber 12a, 12a... And the superabsorbent polymer particles 12b, 12b. It may be covered. Although not shown, only the upper surface and side surfaces of the absorbent body 12 are covered with crepe paper or nonwoven fabric, and the lower surface is covered with a liquid-impermeable sheet such as polyethylene, the upper surface of the absorbent body 12 is covered with crepe paper or nonwoven fabric, The lower surface may be covered with a liquid-impermeable sheet such as polyethylene (each of these materials is a component of the crepe paper 16). If necessary, the aggregate of continuous fibers 12a, 12a... And the layer of superabsorbent polymer particles 12b, 12b... May be sandwiched between two upper and lower sheets or disposed only on the lower surface. This is not a desirable form because it is difficult to prevent the movement of particles.

(Holding sheet 17)
When the holding sheet 17 is provided, the superabsorbent polymer particles 12b can be interposed between the holding sheet 17 and the absorbent body 12 by spraying or the like. The superabsorbent polymer particles 12b may pass through the aggregate of continuous fibers 12a at the time of supply to the aggregate of continuous fibers 12a or in a subsequent process, or in a distribution process until use by a consumer. The unevenness of the superabsorbent polymer particles that have passed through the aggregate of continuous fibers gives a sense of incongruity when touched by the hand when the consumer uses it. Therefore, it is also a preferable form that a holding sheet 17 having the holding performance of the superabsorbent polymer particles 12b is interposed between the absorbent body 12 and the crepe paper 16. The holding sheet 17 reinforces the stiffness that is not sufficient only with the crepe paper 16 such as tissue paper (crepe paper), and reduces or prevents a sense of incongruity when the consumer touches it with the hand.

The material of the holding sheet 17 is not particularly limited as long as it has the holding performance of the superabsorbent polymer 12b. Specifically, for example, non-woven fabric, crimped pulp, low-absorbency cotton fiber (for example, non-degreased cotton fiber, degreased cotton fiber, rayon fiber treated with a water repellent or a hydrophobizing agent, etc.). ), Polyethylene fiber, polyester fiber, acrylic fiber, polypropylene fiber, silk, cotton, hemp, nylon, polyurethane, acetate fiber and the like.
If the holding sheet 17 and the nonwoven fabric, its retention sheet 17, the compression energy 0.01~10.00gfcm / cm ² based on KES test, preferably, at 0.01~1.00gfcm / cm ^2, and compressed The non-woven fabric has a resilience of 10 to 100%, preferably 70 to 100%.

  The reason for providing the holding sheet 17 is to hold, for example, the superabsorbent polymer 12b that has fallen down (dropped out) from the absorbent body 12 as described above. Therefore, since the superabsorbent polymer particles 12b that have come out come into contact with the user via the crepe paper 16 and the holding sheet 17, there is no possibility of being transmitted to the user as a sense of incongruity. In particular, when the nonwoven fabric has the above compression energy and compression resilience, its functions are sufficiently exhibited.

  Further, since the superabsorbent polymer 12b that has slipped out is held by the holding sheet 17 and does not move on the crepe paper 16, there is no possibility of uneven absorption capacity. In particular, in order to prevent the superabsorbent polymer particles 12 b from moving on the holding sheet 17, a hot-melt adhesive having adhesiveness can be applied on the holding sheet 17 in advance. Moreover, you may make it the superabsorbent polymer particle 12b prevent a movement on the holding sheet 17 by making the upper surface (surface which goes to a use surface side) of the holding sheet 17 into a rough surface. Examples of the roughening or fluffing means for this purpose include a non-net surface that is not a net surface during the production of the nonwoven fabric, a marble process, a needle punch process, and a brushing process.

As shown in FIG. 3, the holding sheet 17 may be provided only below the absorber 12, or although not shown, the holding sheet 17 may be wound up and extended to the upper surface of the absorber 12 through the side surface of the absorber 12. It is also possible to use a plurality of holding sheets 17 in a stacked manner.
The above example is an example in which the holding sheet 17 is provided between the absorbent body 12 and the back side portion of the crepe paper 16, but the holding sheet may be on the back side from the covering sheet (the form is illustrated). In short, if a holding sheet is provided on the back side with respect to the absorbent body 12, it is possible to reduce or not cause a crisp discomfort when touching from the back side of the product.

(Back sheet 14)
On the back surface side of the absorbent main body 10, a back sheet 14 exposed on the outer surface of the product is provided. In the present invention, as described above, in order to arrange the back sheet 14 so as to have fiber orientation in the substantially longitudinal direction of the diaper, the material constituting the back sheet 14 is fiber orientation in one direction. A non-woven fabric having properties is used.

  A high body pressure is applied to the back sheet 14 when sitting. Therefore, a material having a high friction fastness (non-fluffing) property is preferable, and in particular, a material that can be evaluated as “「 ”or“ O ”in the following friction fastness test is preferably used. For the same reason, the lower layer nonwoven fabrics 21B and 31B constituting the back body sheet 20 and the front body sheet 30 described later are those that can be evaluated as “◎” or “O” in the following friction fastness test. It is preferable to use it.

(Friction fastness test)
The fastness to friction is measured by the following method according to JISL0849. That is, a sheet piece for measuring the friction fastness of 250 mm × 25 mm is prepared, and the friction fastness on the outer surface side (the outer surface side of the absorbent main body) of the measurement sheet piece is measured. For example, COLOR FASTNESS RUBING TESTER (manufactured by Tester Sangyo Co., Ltd., Model: AB-301) can be used for measuring the friction fastness. The measurement is performed using a friction tester type II and applying 50 vibrations. The measurement sheet piece obtained as a result of the test was visually compared with the limit sample, and (4: no kinking and fluffing ○: no kinking and fuzzing △: kinking and fuzzing x: non-woven fabric was broken) 4 Evaluate in stages.

[Structure of rear body seat 20]
As shown in FIGS. 1, 2 and 7, the back body sheet 20 is a non-woven sheet having a two-layer structure including an upper layer non-woven fabric 21A and a lower layer non-woven fabric 21B, and the upper layer non-woven fabric 21A and the lower layer non-woven fabric 21B. Various elastic elastic members 22..., 23... Are arranged in the horizontal direction between them, and elasticity is given in the horizontal direction. The rear body sheet 20 is bonded to the rear body B side of the absorbent main body 10 and is joined to a front body sheet 30 (to be described later) by a joining edge portion 24 to fix the waistline.

In addition, as shown by the planar shape of FIG.1 and FIG.2, although the concave leg periphery cut line 29 is formed in the part corresponded to the leg part opening of a paper diaper, it may be a rectangular sheet depending on the case. Good.
The back body sheet 20 includes waist elastic elastic members 22, 22 along the horizontal direction with an interval in the vertical direction of the waist portion S1 and the waist portion S2 between the upper nonwoven fabric 21A and the lower nonwoven fabric 21B. A plurality of waist elastic elastic member groups 23, 23.

  The waist elastic elastic members 22, 22... Are a plurality of elastic rubber elastic elastic members arranged in the vicinity of the waist opening edge (waist part S1) in the vertical direction, and around the waist part of the body. It is for attaching a disposable diaper to the body by giving an expansion / contraction force so as to tighten. As the waist elastic elastic member 22, thread rubber is used in the illustrated example, but an elastic member such as a net-like elastic material, elastic hot melt, flat rubber, or elastic film may be used.

  The waist elastic stretchable member groups 23, 23... Extend in the horizontal direction at intervals in the vertical direction over the range (body waist portion S 2) from the lower end of the waist portion S 1 to the lower end of the rear body sheet 20. This elastic rubber elastic elastic member is provided with waist shirring for applying a horizontal stretching force to the waist part of the back body B so that the paper diaper is in close contact with the body. The boundary between the waist elastic elastic members 22, 22... And the waist elastic elastic member groups 23, 23. For example, even if the number of elastic elastic members arranged horizontally in the vertical direction is not specified, some of the upper elastic members 22, 22... The elastic elastic member should just function as the waist elastic elastic member group 23,23 .... Similarly, the waist elastic elastic member group 23 may be made of elastic members such as a net-like elastic material, an elastic hot melt, a flat rubber, and an elastic film in addition to the rubber thread.

  In order to prevent the absorber 12 from being contracted, the waist elastic elastic member groups 23, 23... Are not continuous in the overlapping region where the absorbent main body 10 is joined, and elastic expansion / contraction across the absorbent main body 10. The members 23 are cut to be discontinuous, and the stretchability by the waist elastic elastic member groups 23, 23,... Is not provided. For example, as shown in JP 2000-26015 A and JP 2002-273808 A, discontinuation of the elastic elastic member is performed after various elastic elastic members are disposed between the upper nonwoven fabric 21A and the lower nonwoven fabric 21B. A method of passing between an embossing cutter roll and an anvil roll and finely cutting an elastic stretchable member existing in a predetermined range by pressurization or heating with the embossing cutter roll may be used.

Further, the back body sheet 20 includes a waist portion elastic stretch members 22, 22... And a waist elastic stretch member group 23, 23. The shearing strength can be varied by adjusting (elongation during bonding). At this time, it is desirable to increase the tension of the waist portion S1 and decrease the tension of the waist portion S2. For babies that move actively, the waist part S1 can be tightened strongly to prevent the paper diaper from shifting, and the waist part S2 having the adhesive part with the absorbent main body 10 can be relatively weakly tightened. The followability between the absorbent body and the wearer can be enhanced to prevent leakage and prevent the rubber from being marked.
On the other hand, you may make it arrange | position the elastic expansion-contraction member from which the degree of the elongation rate at the time of the kind and thickness or adhesion | attachment differs with respect to the longitudinal direction of said trunk | drum circumference part S2.

(Upper layer nonwoven fabric 21A and lower layer nonwoven fabric 21B)
In the present invention, as described above, in order that the upper layer nonwoven fabric 21A and the lower layer nonwoven fabric 21B are arranged so as to have fiber orientation in the substantially longitudinal direction of the diaper, the material constituting the upper layer nonwoven fabric 21A and the lower layer nonwoven fabric 21B. As, a non-woven fabric having a fiber orientation in one direction is used. Here, the nonwoven fabric generally has a classification from the fiber orientation state in the web in addition to the classification by the web forming method and the web adhesion method, but as the upper layer nonwoven fabric 21A and the lower layer nonwoven fabric 21B, Classification from the fiber orientation state, that is, a parallel web in which the fibers are oriented in one direction, a cross web in which the fibers are orthogonal, and a random web in which the fibers are randomly oriented, the parallel web in which the fibers are oriented in one direction Is generally used. As a method for producing such a nonwoven fabric, a spunbond method, an air-through method, or SMS is preferably used. In particular, in the present invention, it is preferable to use a spunbond method in which the fiber length can be increased and the fiber orientation can be controlled relatively easily. In addition, when the air-through method is used, the material itself is flexible and has excellent extensibility, and the ratio of the tensile strength (MD / CD) is large, which is preferable for improving the extensibility of the nonwoven fabric. Is superior in terms of the balance between tensile strength and elongation.

[Manufacturing method of rear body sheet 20]
The diaper 1 which concerns on this invention is arrange | positioned and arrange | positioned so that the upper layer nonwoven fabric 21A and the lower layer nonwoven fabric 21B which comprise the sheet | seat 20 for back bodies may have fiber orientation in a diaper longitudinal direction. Here, since the fiber orientation of the nonwoven fabric is generally coincident with the longitudinal direction of the original fabric, when the original fabric is supplied along the diaper production line, the fiber orientation of the nonwoven fabric is similarly applied to the production line. It becomes the same direction as the arrangement direction of the elastic elastic member supplied along, that is, the diaper width direction. Therefore, in the present invention, one of the following manufacturing methods is adopted so that the arrangement direction of the elastic stretchable member and the fiber orientation of the nonwoven fabric are substantially orthogonal to each other.

(First embodiment)
As shown in FIGS. 8 and 9, after the nonwoven fabric 41 having fiber orientation in the longitudinal direction of the original fabric is supplied along the line from the nonwoven fabric supply line 40 on one side and cut at a predetermined interval, A non-woven fabric connection body 43 in which the non-woven fabric is connected and arranged is supplied by being inverted by a 90 ° reversing device 42 so as to have fiber orientation in a direction substantially orthogonal to the line. Moreover, the nonwoven fabric connection body 45 connected in the same manner is supplied from the nonwoven fabric supply line 44 on the other side.
And between these nonwoven fabric connection bodies 43 and 45, the elastic expansion-contraction member 46 continuously arrange | positioned in the part corresponded to waist part S1, and the elastic expansion-contraction continuously arrange | positioned in the part equivalent to waist part S2 The members 47... Are bonded in a stretched state by applying a hot melt adhesive to the peripheral surfaces of the elastic elastic members 46 and 47 according to a known control seam method.

In the production of the back body sheet 20, as shown in FIGS. 8 and 9, the nonwoven fabric connecting body 43 from the nonwoven fabric supply line 40 on the one side is supplied to the lower side of the nip roller portion 48, and the upper side. The nonwoven fabric connection body 45 is supplied from the nonwoven fabric supply line 44 on the other side, and the elastic elastic members 46 and 47 are supplied and bonded to the nonwoven fabric connection bodies 43 and 45, respectively. The back body sheet 20 is manufactured (see FIG. 10). Thereafter, the individual rear body sheets 20 are completed by cutting the continuous rear body sheet 20 at a predetermined position (broken line position).
For example, as shown in FIG. 11A, the peripheral surface application to the elastic elastic members 46 and 47 is performed using a member 49a having a V-shaped groove while supplying an adhesive to the bottom of the groove. An application method using a comb gun 49 in which an elastic expansion / contraction member is passed through a groove, or a conventionally known control in which an elastic expansion / contraction member is passed through a bending member 50 while being entangled as shown in FIG. Examples include a seam coating method, an omega coating method, and a sure wrap coating method. These control seam coating method, omega coating method, and sure wrap coating method are preferable because the peripheral surface coating with higher uniformity can be applied than the comb gun coating in which the adhesive is not easily applied.
Examples of the hot melt adhesive include EVA type, adhesive rubber type (elastomer type), olefin type, polyester / polyamide type, etc., but in this disposable diaper, the adhesive rubber type (elastomer type) is used. It is desirable to use

(Second embodiment)
In the manufacturing method according to the second embodiment, as shown in FIGS. 12 and 13, a plurality of elastic elastic members 46 and 47 are provided along the manufacturing line in portions corresponding to the waist portion S1 and the waist portion S2. After being supplied in an expanded state and wound around the elastic elastic member group, the nonwoven fabric 41 having fiber orientation in the longitudinal direction of the original fabric is spirally supplied to form a sheet shape, and then the back body sheet 20 By cutting in the product shape, individual rear body sheets 20 are completed.
The adhesion method of the elastic elastic members 46 and 47 and the adhesion method of the nonwoven fabric 41 are the same as in the first embodiment.

[Structure and manufacturing method of front body sheet 30]
The front body sheet 30 has substantially the same structure as the back body sheet 20, and as shown in FIG. 1, the front body sheet 30 is a non-woven sheet having a two-layer structure including an upper layer non-woven fabric 31A and a lower layer non-woven fabric 31B. A plurality of elastic elastic members 32, 33,... Are bonded by a hot melt adhesive between 31A and the lower layer nonwoven fabric 31B along the width direction of the waist part S1 and the waist part S2, thereby imparting elasticity. Yes.

The front body sheet 30 is a rectangular sheet, as shown in the plan view of FIG. 1, but in some cases, a concave leg-around cut line is formed at a portion corresponding to the leg opening of the diaper. You may do it.
By manufacturing the front body sheet 30 by the same manufacturing method as the back body sheet 20, the upper nonwoven fabric 31A and the lower nonwoven fabric 31B have fiber orientation in the diaper longitudinal direction.

[Assembly procedure of diaper 1]
As shown in FIGS. 1 and 7, the absorbent main body 10, the back body sheet 20, and the front body sheet 30 are non-body side surfaces of the absorbent main body 10, and the back body B side and the front body. On the front F side, the back body sheet 20 and the front body sheet 30 are bonded and integrated by a hot melt adhesive or the like.

  The absorptive main body 10 can be detachably connected to the rear body sheet 20 and / or the front body sheet 30 using a mechanical fastener or an adhesive.

  Further, the back body sheet 20 and the front body sheet 30 can be bonded to the body-side surface of the absorbent main body 10. In this case, at least the front and rear ends of the absorbent main body 10 are bonded. If comprised in this way, in the front-and-rear part of the absorptive main body 10, since the pocket-shaped part enclosed by the liquid-permeable top sheet 11, the sheet | seat 20 for back bodies, and the sheet | seat 30 for front bodies can be formed, urine There is an effect that can prevent leakage of excrement such as. In particular, in such a configuration, as described above, it is preferable that the elastic elastic members 23, 23,... Thereby, not only the shrinkage of the absorbent body but also the marking on the skin by the elastic elastic member can be prevented. In order to more reliably obtain the front-rear leakage prevention effect by forming the pocket-shaped portion, the rear body sheet 20 and / or the front body sheet 30 and the three-dimensional gather BS are joined, and the rear body sheet 20 and In order to form the pocket-shaped portion by lifting the front body sheet 30, it is also preferable to prevent the thread-like elastic member 15 of the three-dimensional gather BS from being cut.

[Other examples]
(1) In the above embodiment, the absorbent main body in which the absorbent body 12 is interposed between the liquid-permeable top sheet 11 and the leak-proof sheet 19 and the back sheet 14 made of a nonwoven fabric is disposed in the outermost layer. 10 and two non-woven fabrics (upper layer non-woven fabric 21A, lower layer non-woven fabric 21B), a plurality of elastic elastic members 22 ..., 23 ... are disposed along the waist portion S1 and the waist portion S2, and the absorbent main body 10 Between the back body sheet 20 joined to the back body B side and two nonwoven fabrics (upper layer nonwoven fabric 31A, lower layer nonwoven fabric 31B), a number of elastic elastic members 32 along the waist portion S1 and the waistline portion S2,. 33 is arranged and is composed of a front body sheet 30 joined to the front body F side of the absorbent main body 10, and the back body sheet 20 and the front body sheet 30 in a product state, Joint edge at both ends The pants-type disposable diaper 1 in which a waist opening and a pair of left and right leg openings are formed by being joined together in the present invention is a type that is not divided into the rear body sheet 20 and the front body sheet 30. It is possible to apply to the same way.

  Specifically, as shown in FIG. 14, an absorbent main body 10 in which an absorbent body 12 is interposed between a liquid-permeable top sheet 11 and a leak-proof sheet 19, and an outer surface side of the absorbent main body 10. And elastic elastic members 62 along the waist part S1 and the waist part S2 on the front body F side and the back body B side between the two nonwoven fabrics (upper nonwoven fabric 61A, lower nonwoven fabric 61B). , 63... Are arranged, and the back body B and the front body F of the exterior sheet 60 are joined at the joining edge portions at both ends in the product state. In a pants-type disposable diaper having a structure in which an opening and a pair of left and right leg openings are formed, at least two nonwoven fabrics (upper layer nonwoven fabric 61A, lower layer nonwoven fabric 61 constituting the exterior sheet 60) ) Is arranged to have a fiber orientation substantially in the longitudinal direction of the diaper. In addition, the manufacturing method of the said exterior sheet | seat 60 can be manufactured by the method similar to the sheet | seat 20 for back bodies, and the sheet | seat 30 for front bodies mentioned above.

It is an open view which shows the back surface of the underpants type disposable diaper 1 which concerns on this invention. It is an open view which shows the surface of the underpants type disposable diaper 1 which concerns on this invention. It is the III-III arrow directional view of FIG. It is the IV-IV arrow directional view of FIG. It is a front view of a product state. FIG. It is an exploded view of the underpants type disposable diaper. It is a schematic diagram which shows the assembly point of the sheet | seat 20 for back bodies which concerns on a 1st form example. It is the principal part perspective view. It is a principal part top view (XX arrow directional view) of FIG. It is a figure which shows the example of an application | coating procedure (A) (B) of an adhesive agent. It is a schematic diagram which shows the assembly point of the sheet | seat 20 for back bodies which concerns on a 2nd form example. FIG. 13 is a view taken along line XIII-XIII in FIG. 12. It is an exploded view of the underpants type disposable diaper 1 concerning other forms. (A), (B) is a manufacturing-process figure of the conventional underpants type disposable diaper 70. FIG. It is a front view of the product state which shows the conventional pants type disposable diaper 70.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Pants type disposable diaper, 10 ... Absorbent main body, 11 ... Liquid-permeable top sheet, 12 ... Absorber, 13 ... Gathered nonwoven fabric, 14 ... Back sheet, 15 ... Filament elastic elastic member, 16 ... Crepe paper, 17 ... Retaining sheet, 18 ... intermediate sheet, 19 ... leak-proof sheet, 20 ... sheet for back body, 21A ... upper layer nonwoven fabric, 21B ... lower layer nonwoven fabric, 22 ... waist elastic elastic member, 23 ... waist elastic elastic member, 24 ... Joining edge part, 29 ... leg circumference cut line, 30 ... front body sheet, 31A ... upper layer nonwoven fabric, 31B ... lower layer nonwoven fabric, 32 ... waist elastic elastic member, 33 ... waist elastic elastic member, 40 · 44 ... nonwoven fabric Supply line, 42 ... 90 ° reversing device, 43/45 ... Non-woven fabric connection body, B ... Back body, F ... Front body, S1 ... Waist part, S2 ... Cylinder circumference part

Claims (6)

An absorbent body is interposed between a liquid-permeable top sheet and a liquid-impervious sheet, and a waist sheet is provided between the two nonwoven fabrics and an absorbent main body in which a back sheet made of a nonwoven fabric is disposed in the outermost layer. A large number of elastic elastic members are disposed along the waist part and the waist part, and the waist part and the waist part are disposed between the back body sheet to be joined to the back body side of the absorbent main body and the two nonwoven fabrics. A large number of elastic elastic members are arranged, and are composed of a front body sheet joined to the front body side of the absorbent main body, and the back body sheet and the front body sheet in a product state, In a pants-type disposable diaper in which a waist opening and a pair of left and right leg openings are formed by being joined at the joining edges of both side ends,
The two nonwoven fabrics constituting the back body sheet and the two nonwoven fabrics constituting the front body sheet are arranged so as to have fiber orientation in a substantially longitudinal direction of the diaper,
A pants-type disposable diaper, wherein the nonwoven fabric constituting the back sheet is arranged so as to have fiber orientation in a substantially longitudinal direction of the diaper. Absorbent body including an absorbent body, and elastically stretched along the waist part and waist part of the front body side and the back body side between the two nonwoven fabrics and integrally provided on the outer surface side of the absorbent body And a pair of left and right waist openings by joining the rear body and the front body of the exterior sheet in the product state at the joining edge portions on both side ends. In a pants-type disposable diaper with a leg opening,
A pants-type disposable diaper, wherein at least two nonwoven fabrics constituting the exterior sheet are arranged so as to have fiber orientation in a substantially longitudinal direction of the diaper.   The pants-type disposable diaper according to any one of claims 1 and 2, wherein in the front body sheet and / or the back body sheet, an elastic elastic member is cut and discontinuous in a region overlapping with the absorber.   The pants-type disposable diaper according to any one of claims 1 to 3, wherein the nonwoven fabric constituting the front body sheet, the back body sheet or the exterior sheet is a nonwoven fabric produced by a spunbond method. A method for producing a front body sheet, a rear body sheet or an exterior sheet used in the pants-type disposable paper diaper according to claim 1,
From the nonwoven fabric supply line on one side, a nonwoven fabric having fiber orientation in the longitudinal direction of the original fabric is supplied along the line and cut at a predetermined interval, and then reversed by a 90 ° reversing device, almost perpendicular to the line The non-woven fabric connection body in which the non-woven fabric is connected and arranged is supplied, and the non-woven fabric connection body connected in the same manner is supplied from the non-woven fabric supply line of the non-woven fabric connection body. Production of a sheet for a pants-type disposable diaper, wherein a plurality of elastic elastic members are continuously bonded in a stretched state to portions corresponding to a waist portion and a waist portion, and then cut into a predetermined shape Method. A method for producing a front body sheet, a rear body sheet or an exterior sheet used in the pants-type disposable paper diaper according to claim 1,
A plurality of elastic elastic members are supplied in a stretched state along the production line, and a non-woven fabric having fiber orientation in the longitudinal direction of the original fabric is spirally supplied so as to be wound around the elastic elastic member group. After that, the manufacturing method of the sheet | seat for underpants type disposable diapers characterized by cut | disconnecting to a predetermined shape.

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