CN113766901B

CN113766901B - Disposable diaper and method for manufacturing the same

Info

Publication number: CN113766901B
Application number: CN202080032819.XA
Authority: CN
Inventors: 泽井麻子
Original assignee: Daio Paper Corp
Current assignee: Daio Paper Corp
Priority date: 2019-06-03
Filing date: 2020-06-02
Publication date: 2023-03-07
Anticipated expiration: 2040-06-02
Also published as: JP7082591B2; TW202045112A; CN113766901A; WO2020246450A1; JP2020195587A

Abstract

The design sheet can be designed with deep-tone horizontal stripes, and it can be confirmed during the production process whether the absorbent body (absorbent core) is properly arranged. The disposable diaper has the following design sheet: a plurality of widthwise horizontal stripe designs (HS) are formed on a design sheet (11) at intervals in the front-rear direction of a diaper, the horizontal stripe designs (HS) can be visually recognized from the outside, an absorbent body (56) having a length shorter than the entire length of the design sheet (11) is arranged, the horizontal stripe designs (HS) are not formed between the end edges of the design sheet and the end edges of the absorbent body (56), or the horizontal stripe designs (HS) are formed but the lightness L [ Delta ] between the lightness L [ Delta ] of the horizontal stripe designs (HS) and the lightness L [ Delta ] of the ground color of the design sheet is within 10.

Description

Disposable diaper and method for manufacturing the same

Technical Field

The present invention relates to a disposable diaper having a design sheet and a method for manufacturing the same.

Background

In a disposable diaper, a design printed portion which can be visually recognized from the outside is formed on a design-providing sheet to attract the interest of a wearer or a parent to promote sales. In this case, a character is often used as a design in a disposable diaper for infants (see, for example, patent document 1).

However, there are many people who are enuresis at night even in the age of 5 or more, for example, and the personalities of the disposable diapers for the enuresis patient who has passed the age of young children are not appropriate.

Thus, for example, one can consider: horizontal stripe (frame) design is performed to show the tone of young people.

Documents of the prior art

Patent document

Patent document 1: japanese patent No. 6193448

Disclosure of Invention

Problems to be solved by the invention

On the other hand, the horizontal stripe design is preferably a dark-tone design from the viewpoint of attractive force. However, it was found that: in the case of a dark-tone lateral stripe design, it may not be possible to accurately check whether the absorber is properly arranged.

In the method for manufacturing a diaper, a step of attaching another member such as a liquid-impermeable sheet to an absorbent body (absorbent core) wrapped in a packaging sheet and then cutting the same into an appropriate half-length or end-length is provided, and in this case, it is possible to confirm whether or not the position of the absorbent body after cutting is correctly arranged and whether or not the arrangement of the absorbent body (absorbent core) is appropriate by allowing light to pass through the half-length or end-length and observing whether or not the length of a portion where no absorbent body is present (a portion where light is transmitted more) is within an allowable range.

However, when the liquid-impermeable sheet is designed to have the transverse stripe using a deep tone as described above, there are problems as follows: a dark-colored lateral stripe design appears in a portion where no absorber is present, and it is determined that an absorber is present, and the position of the absorber cannot be detected correctly.

Therefore, a main object of the present invention is to enable a design sheet to be designed with a deep-tone horizontal stripe.

Another object is to obtain the following configuration: it is possible to confirm whether or not the absorber (absorbent core) is properly arranged during the manufacturing process.

Other problems can be determined according to the following embodiments.

Means for solving the problems

A disposable diaper having the above-described problems solved is as follows.

The basic idea of the invention is as follows: a dark-tone horizontal stripe design can be formed on the design sheet, and the attractiveness of the product (for example, emphasis on the tonality of young people) can be enhanced.

On the other hand, in order to be able to confirm whether the arrangement of the absorber (absorbent core) with respect to the semi-finished product or the finished product is proper during the manufacturing process, the following design is made: a design sheet is provided with no horizontal stripe design between the edges of the design sheet and the edges of the absorbent body, or the difference in lightness between the lightness L of the horizontal stripe design and the lightness L of the ground color of the design-imparted sheet is small even when the horizontal stripe design is formed.

< basic mode >

As an embodiment of the present invention based on this basic idea, there can be mentioned a disposable diaper,

the disposable diaper has a design sheet as follows: the design-providing sheet is formed with a plurality of widthwise horizontal stripe designs which are visible from the outside at intervals in the front-rear direction of the diaper,

an absorber having a length shorter than the entire length of the design sheet is provided for the design sheet,

the lateral stripe design is not formed between the end edge of the design sheet and the end edge of the absorbent body, or,

the lightness difference Delta between the lightness L of the horizontal stripe design and the lightness L of the ground color of the design-providing sheet is 10 or less, although the horizontal stripe design is formed.

For example, as described above, there is a step of attaching another member such as a liquid-impermeable sheet to an absorbent body (absorbent core) wrapped in a wrapping sheet and then cutting the same into an appropriate half-length or end-length, and at this time, it is possible to confirm whether or not the position of the absorbent body after cutting is correctly arranged and whether or not the arrangement of the absorbent body (absorbent core) is correct by allowing light to pass through the half-product or end-product and observing whether or not the length of a portion where no absorbent body is present (a portion where light is transmitted more) is within an allowable range, and in the case of adopting such a form, if the lateral stripe design is not formed between the design sheet edge of the lateral stripe design and the edge of the absorbent body, or if the difference Δ between the lightness L £ of the lateral stripe design and the lightness L @ of the ground color of the design-imparted sheet is within 10 even if the lateral stripe design is formed, it is possible to accurately grasp whether or not the absorbent body (absorbent core) is arranged, which is advantageous in production management relating to the exclusion of defective products.

Preferably, in addition to the cross-stripe design, alignment marks are added. Preferably, the alignment mark is color-printed so that at least a part of both end portions of the horizontal stripe design overlaps each other.

The alignment mark may be formed between the horizontal stripes of the horizontal stripe design, but from the design viewpoint, the alignment mark is preferably as inconspicuous as possible. Therefore, if the color printing is performed so that at least a part (more preferably, the whole) of both end portions of the horizontal stripe design is overlapped, the alignment mark is inconspicuous because it exists in the horizontal stripe.

The disposable diaper of the present invention can be manufactured by the following manufacturing method, for example.

That is, it is preferable to adopt a method of manufacturing a disposable diaper having an absorbent body interposed between a liquid-permeable top sheet on the use surface side and a liquid-impermeable sheet on the back surface side,

it is characterized in that the preparation method is characterized in that,

the disposable diaper comprises a design sheet formed by forming a lateral stripe design on a design-providing sheet, the lateral stripe design being formed along a direction perpendicular to a production line direction and spaced apart from each other in the production line direction, the design sheet being positioned on a back surface side of the absorbent body in a finished state, and the lateral stripe design being visible from the outside in the finished state,

the method for manufacturing the disposable diaper comprises the following steps: the absorbent bodies are intermittently arranged in the production line direction for the continuous design sheet, and then the design sheet is transversely cut at a position between the absorbent bodies adjacent in the production line direction,

an absorber having a length shorter than its full length is disposed for the design sheet,

the transverse stripe design is not formed between the end edge of the design sheet and the end edge of the absorbent body, or the lightness difference Delta between the lightness Lx of the transverse stripe design and the lightness Lx of the ground color of the design-added sheet is within 10 even though the transverse stripe design is formed.

A transmitted light amount detection member for the absorber is disposed on the production line, and when a length in the production line direction, which indicates a light amount at which a transmitted light amount of the transmitted light amount detection member is equal to or greater than a threshold value, is within a predetermined length range while the absorber is being conveyed together with the design sheet, it can be determined that the absorber is disposed in a normal state, and when the length in the production line direction is not within the predetermined length range, it can be determined that the absorber is disposed in a non-normal state, and shipment of a product (defective product) whose position of the absorber is non-normal can be prevented.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, a dark-tone horizontal stripe design can be adopted for the design sheet. In addition, in the manufacturing process, whether the absorber (absorbent core) is properly arranged can be confirmed.

Drawings

Fig. 1 is a plan view showing an unfolded state of an inner surface of a first pants-type disposable diaper.

Fig. 2 is a plan view showing an unfolded state of an outer surface of a pants-type disposable diaper.

Fig. 3 is a cross-sectional view taken along line 3-3 of fig. 1.

Fig. 4 is a cross-sectional view taken along line 4-4 of fig. 1.

Fig. 5 (a) is a sectional view taken along line 5a-5a in fig. 1, and (b) is a sectional view taken along line 5b-5b in fig. 1.

Fig. 6 is a perspective view of a pants-type disposable diaper.

Fig. 7 is a plan view showing an unfolded state of the outer surface of the second pants-type disposable diaper.

Fig. 8 (a) is a sectional view taken along the line 8a-8a in fig. 7, and (b) is a sectional view taken along the line 8b-8b in fig. 7.

Fig. 9 is a plan view of the developed state as viewed from the use surface side.

Fig. 10 is a cross-sectional view taken along line 10-10 of fig. 9.

Fig. 11 is a plan view of an example of the horizontal stripe design.

Fig. 12 is a perspective view for explaining the outline of the manufacturing process.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the drawings.

< first pants-type disposable diaper >

Fig. 1 to 6 show an example 100 of a first pants-type disposable diaper. The dotted line portion in the cross-sectional view indicates an adhesive as a joining means for joining the respective components on the front and back sides thereof, and is formed by full-surface application of a hot-melt adhesive, linear (ビード) application, curtain (カーテン) application, critical portion (サミット) application or spiral application, pattern application (transfer of a hot-melt adhesive by a relief method), or the like, or a fixed portion of an elastic member is formed by application to the outer peripheral surface of the elastic member by an application gun, glue application, or the like in place of or together with the adhesive. Examples of the hot melt adhesive include EVA adhesives, adhesive rubber adhesives (elastic adhesives), olefin adhesives, and polyester polyamide adhesives, and can be used without particular limitation. As a joining means for joining the respective constituent members, a material-based welding means such as heat sealing or ultrasonic sealing may be employed.

The first pants-type disposable diaper 100 includes: a front side outer body 12F constituting a front body portion F; a rear side exterior body 12B constituting a rear body portion B; and an interior body 200 provided inside the

exterior bodies

12F, 12B so as to extend from the front side exterior body 12F to the rear side exterior body 12B through the crotch portion, both side portions of the front side exterior body 12F and both side portions of the rear side exterior body 12B being joined together to form side seal portions 12A, whereby, referring to fig. 6, openings formed by the front and rear end portions of the

exterior bodies

12F, 12B serve as waist openings WO through which the waist of the wearer passes, and portions surrounded by the lower edges of the

exterior bodies

12F, 12B and the side edges of the interior body 200 on both sides in the width direction of the interior body 200 serve as leg openings LO through which the legs pass. The inner body 200 is a portion for absorbing and retaining excrement such as urine, and the

outer bodies

12F and 12B are portions for supporting the inner body 200 with respect to the body of the wearer. In addition, reference numeral Y denotes the entire length of the diaper in the developed state (refer to fig. 6, the longitudinal length from the edge of the waist opening WO of the front body F to the edge of the waist opening WO of the rear body B), and reference numeral X denotes the entire width of the diaper in the developed state.

Further, the first pants-type disposable diaper 100 has a waist region T defined as a front-rear direction range (a front-rear direction range from the waist opening WO to the upper end of the leg opening LO) having the side seals 12A, and an intermediate region L defined as a front-rear direction range of a portion forming the leg opening LO (between the front-rear direction region of the front body portion F having the side seals 12A and the front-rear direction region of the rear body portion B having the side seals 12A). The waist region T can be conceptually divided into a "waist portion" W forming an edge portion of the waist opening and a "waist lower portion" U being a portion below the waist opening. In general, when a boundary at which the stretching stress in the width direction changes (for example, when the thickness and the elongation of the elastic member change) is present in the waist region T, a portion closer to the waist opening WO than the boundary closest to the waist opening WO becomes the waist portion W, and when such a boundary is absent, a portion closer to the waist opening WO than the absorbent body 56 or the interior body 200 becomes the waist portion W. The length in the front-rear direction thereof may be appropriately determined depending on the size of the product, and for example, the waist portion W may be 15 to 40mm, and the waist lower portion U may be 65 to 120mm. On the other hand, both side edges of the intermediate region L are narrowed in a shape of コ or in a curve so as to follow the leg girth of the wearer, and this is a region into which the legs of the wearer enter. As a result, the pants-type disposable diaper in the unfolded state is formed into a substantially hourglass shape as a whole.

(inner body 200)

The inner body 200 may have any shape, but is rectangular in the illustrated embodiment. As shown in fig. 3 to 5, the interior body 200 includes: a topsheet 30 on the body side; a liquid-impermeable sheet 11; and an absorbent member 50 interposed therebetween, the interior body 200 being a main body portion having an absorbent function. Reference numeral 40 denotes an intermediate sheet (second sheet) provided between the top sheet 30 and the absorbent member 50 in order to rapidly move the liquid having permeated the top sheet 30 toward the absorbent member 50, and reference numeral 60 denotes three-dimensional gather portions 60 standing toward the body side provided on both sides of the inner body 200 in order to prevent the leakage of excrement to both sides of the inner body 200.

The fixation of the interior body 200 to the

exterior bodies

12F, 12B may be performed by a bonding means by material fusion such as heat sealing or ultrasonic sealing, or a hot-melt adhesive. In the illustrated embodiment, the inner surfaces of the

outer bodies

12F and 12B are fixed to each other by the hot-melt adhesive applied to the back surface of the inner body 200, that is, in this case, the back surface of the liquid-impermeable sheet 11 and the attachment portions 65 of the three-dimensional gathers 60. The inner and outer fixing portions 201 for fixing the interior body 200 and the

exterior bodies

12F and 12B together may be provided over substantially the entire region where the two overlap, and are preferably provided in portions other than both end portions of the interior body in the width direction.

(Top sheet 30)

The top sheet 30 has a liquid-permeable property, and examples thereof include a porous or non-porous nonwoven fabric, a porous plastic sheet, and the like. The kind of the raw material fiber of the nonwoven fabric is not particularly limited. Examples thereof include olefin-based fibers such as polyethylene and polypropylene, synthetic fibers such as polyester and polyamide, regenerated fibers such as rayon and cuprammonium fibers, natural fibers such as cotton, and the like, and mixed fibers and composite fibers using two or more of these fibers. Further, the nonwoven fabric may be produced by any process. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a hot-rolling method, a melt-blowing method, a needle-punching method, a hot-air method, and a point-bonding method. For example, when flexibility and drapability are desired, the spunbond method and the spunlace method are preferred processing methods, and when bulkiness and flexibility are desired, the hot air method, the spot-bonding method, and the hot-rolling method are preferred processing methods.

The top sheet 30 may be composed of one sheet, or may be composed of a laminate sheet obtained by laminating two or more sheets. Similarly, the top sheet 30 may be formed of one sheet or two or more sheets in the planar direction.

In the case where the three-dimensional gather portion 60 is provided, both side portions of the top sheet 30 preferably pass between the liquid-impermeable sheet 11 and the three-dimensional gather portion 60 and are wound around the back surface side of the absorbent member 50, and the liquid-impermeable sheet 11 and the three-dimensional gather portion 60 are preferably joined to each other in order to prevent liquid from permeating.

For the purpose of preventing positional deviation with respect to the back side member, etc., it is desirable that the top sheet 30 is fixed to the member adjacent on the back side by a bonding means based on material fusion such as heat sealing or ultrasonic sealing, or a hot melt adhesive. In the illustrated embodiment, the top sheet 30 is fixed to the front surface of the intermediate sheet 40 and the front surface of the portion of the wrapping sheet 58 located on the front surface side of the absorber 56 by a hot melt adhesive applied to the back surface thereof.

(intermediate sheet 40)

In order to rapidly transfer the liquid having passed through the top sheet 30 to the absorbent body, an intermediate sheet (also referred to as "second sheet") 40 having a liquid passing speed higher than that of the top sheet 30 may be provided. The intermediate sheet 40 not only can rapidly move the liquid toward the absorbent body to improve the absorption performance of the absorbent body, but also can prevent the phenomenon of "back flow" of the absorbed liquid from the absorbent body, and can keep the top sheet 30 in a dry state. The intermediate sheet 40 may also be omitted.

The intermediate sheet 40 may be made of the same material as the top sheet 30, or may be made of spunlace nonwoven fabric, spunbond nonwoven fabric, SMS nonwoven fabric, pulp nonwoven fabric, a mixed sheet of pulp and rayon, point-bond nonwoven fabric, or crepe paper. The air-through nonwoven fabric is particularly bulky and is therefore preferable. In the air-through nonwoven fabric, a composite fiber having a core-sheath structure is preferably used, and in this case, the resin used for the core may be polypropylene (PP), but Polyester (PET) having high rigidity is preferred. The weight per unit area is preferably 20 to 80g/m ² More preferably 25 to 60g/m ² . The thickness of the raw material fiber of the nonwoven fabric is preferably 2.0 to 10dtex. In order to make the nonwoven fabric bulky, it is preferable to use a mixed fiber in which the core is not located at the center as all or a part of the raw material fiberThe core-shifted fiber, the hollow fiber, or the core-shifted and hollow fiber of (1).

The intermediate sheet 40 in the illustrated embodiment is shorter than the width of the absorber 56, is disposed at the center, and may be provided over the entire width. The longitudinal length of the intermediate sheet 40 may be the same as the length of the absorber 56, or may be within a short length range centered on the liquid-receiving region.

For the purpose of preventing positional deviation or the like of the intermediate sheet 40 with respect to the rear surface side member, it is desirable that the intermediate sheet 40 is fixed to the member adjacent on the rear surface side by a bonding means by material fusion such as heat sealing or ultrasonic sealing, or a hot melt adhesive. In the illustrated embodiment, the intermediate sheet 40 is fixed to the front surface of the portion of the packaging sheet 58 located on the front surface side of the absorber 56 by a hot melt adhesive applied to the back surface thereof.

(liquid-impermeable sheet 11)

The material of the liquid-impermeable sheet 11 is not particularly limited, and examples thereof include a plastic film made of an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric in which a plastic film is provided on the surface of a nonwoven fabric, and a laminate sheet in which a nonwoven fabric and the like are laminated on a plastic film and bonded. As the liquid-impermeable sheet 11, a fabric having liquid-impermeable property and moisture-permeable property is preferably used from the viewpoint of prevention of stuffiness. As a plastic film having moisture permeability, a microporous plastic film obtained as follows is widely used: an inorganic filler is mixed with an olefin resin such as polyethylene or polypropylene to form a sheet, and the sheet is stretched in a uniaxial or biaxial direction. In addition, as the liquid-impermeable sheet 11, a sheet having liquid-impermeability without using a plastic film may be used, and such a sheet is rendered liquid-impermeable by the following method: a nonwoven fabric using a micro denier fiber; the voids of the fibers are reduced by applying heat or pressure, thereby enhancing the leakage prevention; and coating a super absorbent resin or a hydrophobic resin or a water repellent agent.

The liquid-impermeable sheet 11 may be formed to have a width converging on the back surface side of the absorbent member 50 as shown in the figure, and may extend to both sides of the absorbent member 50 and to both side portions of the surface of the absorbent member 50 on the top sheet 30 side in order to improve leakage prevention. The width of the extending portion is preferably about 5 to 20mm on the left and right sides, respectively.

Further, a discharge indicator whose color changes due to absorption of a liquid component may be provided on the inner side of the liquid-impermeable sheet 11, particularly on the surface closer to the absorbent body 56.

(three-dimensional gather portion 60)

The three-dimensional gather portion 60 is a belt-like member extending in the entire front-rear direction along both side portions of the interior body 200, and is designed to block excrement moving in the lateral direction on the top sheet 30 and prevent side leakage. The three-dimensional gather portion 60 of the present embodiment is provided so as to rise from the side portion of the inner body 200, the root side portion of the three-dimensional gather portion 60 rises obliquely toward the widthwise central side, and the end side portion of the three-dimensional gather portion 60 with respect to the intermediate portion rises obliquely toward the widthwise outer side.

More specifically, the three-dimensional gather portion 60 is configured as follows: a belt-like gather sheet 62 having a length equal to the length of the interior body 200 in the front-rear direction is folded back in the width direction so as to be folded into two, and a plurality of the gather elastic members 63 are fixed between the folded-back portion and the sheet in the vicinity thereof at intervals in the width direction in a state where the elongated gather elastic members 63 are elongated in the length direction. A base end portion of the three-dimensional gather portion 60 on the opposite side to the tip end portion (an end portion on the opposite side to the portion where the sheet is folded back in the width direction) is an attachment portion 65 fixed to the back surface of the side edge portion of the interior body 200, and a portion other than the attachment portion 65 is a protruding portion 66 (a portion on the folded-back portion side) protruding from the attachment portion 65. The projecting portion 66 is constituted by a root side portion toward the center side in the width direction and a tip side portion turned back from the tip of the root side portion toward the outer side in the width direction. This form is a three-dimensional gather portion of the surface contact type, and a three-dimensional gather portion of the line contact type (not shown) that is not folded back to the outside in the width direction may be employed. The projecting portions 66 have front and rear end portions which are front and rear fixing portions 67 fixed to the side surface of the top sheet 30 in a laid-down state, and have a front and rear intermediate portion which is not fixed between the front and rear fixing portions 67 and a front and rear intermediate portion which is a free portion 68, and the gather portion elastic member 63 along the front and rear direction is fixed to the free portion 68 in an extended state.

At the free portions 68 of the three-dimensional gather portion 60, at least one of a hot-melt adhesive by various application methods and a fixing means by material fusion such as heat sealing or ultrasonic sealing can be used for bonding the inner layer and the outer layer of the gather sheet 62 or fixing the gather portion elastic member 63 sandwiched therebetween. Since the flexibility is impaired if the entire surfaces of the inner layer and the outer layer of the gather sheet 62 are bonded, it is preferable that the portions other than the bonded portion of the gather elastic member 63 are not bonded or weakly bonded. In the illustrated embodiment, the structure is as follows: by applying the hot melt adhesive only to the outer peripheral surface of the gather elastic member 63 with an application member such as an application gun or a glue nozzle and sandwiching the gather elastic member 63 between the inner layer and the outer layer of the gather sheet 62, the fixing of the elongated elastic member to the inner layer and the outer layer of the gather sheet 62 and the fixing of the inner layer and the outer layer of the gather sheet 62 are performed only with the hot melt adhesive applied to the outer peripheral surface of the gather elastic member 63.

In addition, for fixing the waterproof film 64 and the gather sheet 62 incorporated in the three-dimensional gather portion 60 or fixing the front-rear fixing portion 67 to the side surface of the interior body 200, at least one of a hot-melt adhesive by various application methods and a means based on material fusion such as heat sealing or ultrasonic sealing can be used. In the illustrated embodiment, the waterproof film 64 is fixed by slit coating using a hot-melt adhesive. In addition, although a hot-melt adhesive and a material fusion method are used in combination for fixing the front and rear fixing portions 67 in the illustrated embodiment, these fixing portions may be performed by only one of the methods.

As the gather sheet 62, a gather sheet obtained by subjecting a nonwoven fabric excellent in softness, uniformity, and hiding property, such as a spunbond nonwoven fabric (SS, SSs, etc.), an SMS nonwoven fabric (SMS, SSMMS, etc.), and a meltblown nonwoven fabric, to water repellent treatment with silicone or the like as necessary can be suitably used, and the unit surface of the fiberThe weight of the product is preferably about 10 to 30g/m ² . As the elongated elastic member (gather portion elastic member) 63, a rubber thread or the like can be used. When the spandex rubber thread is used, the thickness is preferably 470 to 1240dtex, and more preferably 620 to 940dtex. The elongation at fixation is preferably 150 to 350%, more preferably 200 to 300%. As shown in the drawing, the waterproof film 64 may be interposed between the folded gather sheets.

The number of the elongated elastic members 63 provided in the free portion of the three-dimensional gather portion 60 is preferably 2 to 6, and more preferably 3 to 5. The arrangement interval 60d is preferably 3 to 10 mm. With such a configuration, the skin can be easily brought into surface contact within the range where the elongated elastic member 63 is disposed. The elongated elastic member 63 may be disposed not only on the distal end side but also on the root side.

The fixing object of the mounting portion 65 of the three-dimensional gather portion 60 may be an appropriate member such as the top sheet 30, the liquid-impermeable sheet 11, and the absorbent member 50 in the interior body 200.

In the three-dimensional gather portion 60 configured as described above, the contraction force of the elongated elastic member 63 acts to bring the front and rear direction both end portions into proximity, but the front and rear direction both end portions of the protruding portion 66 are fixed so as not to rise, whereas the both end portions form an unfixed free portion therebetween, so that only the free portion rises so as to come into contact with the body side as shown in fig. 3. In particular, when the attachment portion 65 is positioned on the back side of the interior body 200, the three-dimensional gather portion 60 rises so as to open outward in the width direction at the crotch portion and the vicinity thereof, and therefore the three-dimensional gather portion 60 comes into surface contact with the periphery of the leg portion, and the fit is improved.

The dimensions of the three-dimensional gather portion 60 can be determined as appropriate, but in the case of an infant diaper, for example, as shown in fig. 3, the rising height (the width-directional length of the protruding portion 66 in the expanded state) W6 of the three-dimensional gather portion 60 is preferably 15 to 60mm, and particularly preferably 20 to 40mm. The separation distance W3 between the folding lines positioned on the innermost side in the state where the three-dimensional gather portion 60 is folded flat so as to be parallel to the front surface of the top sheet 30 is preferably 60 to 190mm, and particularly preferably 70 to 140mm.

Further, unlike the illustrated embodiment, two (two) three-dimensional gather portions may be provided on each of the right and left sides of the inner body 200.

(absorbing Member 50)

The absorbent member 50 has: an absorber 56; and a wrapping sheet 58 covering the entire absorbent body 56. The wrapping sheet 58 may also be omitted.

(absorber 56)

The absorbent body 56 may be formed of an aggregate of fibers. As the fiber aggregate, in addition to an aggregate obtained by stacking short fibers such as cotton pulp or synthetic fibers, a filament (filament) aggregate obtained by opening a tow (fiber bundle) of synthetic fibers such as cellulose acetate, if necessary, can be used. The basis weight of the fibers may be, for example, about 100 to 300g/m in the case of stacking cotton pulp or short fibers ² In the case of a filament mass, it may be, for example, about 30 to 120g/m ² . The fineness of the synthetic fiber is, for example, 1 to 16dtex, preferably 1 to 10dtex, and more preferably 1 to 5dtex. In the case of the filament assembly, the filaments may be uncrimped fibers, but crimped fibers are preferable. The crimp of the crimped fibers may be, for example, 5 to 75 crimps per 2.54 cm, preferably 10 to 50 crimps, and more preferably about 15 to 50 crimps. In addition, uniformly crimped fibers may be used. The superabsorbent polymer particles are preferably dispersed and held in the absorbent body 56.

The absorbent body 56 may have a rectangular shape, but as shown in fig. 1 and 2, it is preferable to form the absorbent body 56 and the three-dimensional gather portion 60 in an hourglass shape having a front end portion, a rear end portion, and a narrowed portion which is located between the front end portion and the rear end portion and which has a width smaller than the width of the front end portion and the rear end portion, because the fit around the leg portions is improved in the absorbent body 56 itself and the three-dimensional gather portion 60.

The size of the absorbent body 56 may be appropriately determined as long as it extends over the front, rear, left, and right sides of the urination orifice position, but it preferably extends in the front-rear direction and the width direction to the peripheral edge of the interior body or its vicinity. Reference numeral 56X denotes the width of the absorber 56.

(super absorbent Polymer particles)

The super absorbent polymer particles may be contained in a part or all of the absorbent body 56. The super absorbent polymer particles include "powder" in addition to "particles". As the super absorbent polymer particles, particles used in such disposable diapers can be used as they are, and for example, particles having a ratio of particles remaining on the screen of 30% by weight or less in the screening (shaking for 5 minutes) using a 500 μm standard screen (JIS Z8801-1).

The material of the super absorbent polymer particles is not particularly limited, but a material having a water absorption capacity of 40g/g or more is preferable. Examples of the super absorbent polymer particles include high absorbent polymer particles such as starch-based, cellulose-based, and synthetic polymer-based, and high absorbent polymer particles such as starch-acrylic acid (salt) -grafted polymer, saponified product of starch-acrylonitrile copolymer, crosslinked sodium carboxymethylcellulose, and acrylic acid (salt) -based polymer can be used. The shape of the super absorbent polymer particles is preferably a powder shape which is generally used, but other shapes may be used.

The superabsorbent polymer particles preferably have a water absorption rate of 70 seconds or less, particularly 40 seconds or less. If the water absorption rate is too slow, so-called back flow in which the liquid supplied into the absorbent body 56 returns to the outside of the absorbent body 56 tends to occur.

The basis weight of the superabsorbent polymer particles can be determined as appropriate depending on the absorption amount required for the application of the absorbent body 56. Therefore, it cannot be said in general that it may be 50 to 350g/m ² . If the weight per unit area of the polymer is less than 50g/m ² It is difficult to secure the absorption amount. If it exceeds 350g/m ² The effect is saturated.

The distribution density or the distribution amount of the super absorbent polymer particles can be adjusted in the planar direction of the absorbent body 56, if necessary. For example, the amount of distribution at the liquid discharge portion may be made higher than the amount of distribution at other portions. In the case of considering the difference between men and women, the distribution density (amount) can be increased in the front side in the case of men, and the distribution density (amount) can be increased in the central portion in the case of women. Further, a portion where no polymer is present may be provided locally (for example, in a dot shape) in the planar direction of the absorbent body 56.

(packaging sheet 58)

When the packaging sheet 58 is used, a thin paper (particularly crepe paper), a nonwoven fabric, a polyethylene laminated nonwoven fabric, a sheet with small holes, or the like can be used as a material. Among these, a sheet that does not cause the super absorbent polymer particles to come out is preferable. When a nonwoven fabric is used instead of crepe paper, a hydrophilic SMS nonwoven fabric (SMS, SSMMS, etc.) is particularly suitable, and polypropylene, a polyethylene/polypropylene composite material, or the like can be used as the material. The weight per unit area is preferably 5 to 40g/m ² Particularly preferably 10 to 30g/m ² 。

The packaging method of the packaging sheet 58 can be appropriately determined, but from the viewpoints of ease of production, prevention of leakage of superabsorbent polymer particles from the front and rear edges, and the like, the following method is preferred: the packaging sheet 58 is wound in a tubular shape so as to surround the front and back surfaces and both side surfaces of the absorbent body 56, and the front and back edge portions thereof are protruded from the front and back of the absorbent body 56, and the overlapped portion of the wound and overlapped portion and the overlapped portion of the front and back protruded portion are joined together by a joining means such as a hot melt adhesive or material welding.

(

outer cases

12F and 12B)

The

outer bodies

12F and 12B are composed of a front side outer body 12F which is a part constituting the front body portion F and a rear side outer body 12B which is a part constituting the rear body portion B, and the front side outer body 12F and the rear side outer body 12B are discontinuous on the crotch side and separated in the front-rear direction. The separation distance 12d may be about 150 to 250mm. The crotch cover sheet 12M made of nonwoven fabric or the like is preferably bonded so as to cover a part of the exposed portion of the back surface of the interior body 200 at the separated portion (for example, the entire portion in the front-rear direction extending over the portion exposed between the front-side exterior body 12F and the rear-side exterior body 12B does not extend to the front-rear end of the interior body 200, and both side edges in the width direction do not reach both side edges of the interior body 200), or the entire portion, but may be omitted. As shown in fig. 7 and 8, the outer body 12 may be an integral outer body that continues from the front body portion F through the crotch to the rear body portion B. That is, the

outer cases

12F and 12B constituting the front body portion F and the rear body portion B respectively correspond to the former embodiment, and the outer case 12 integrally constituting the front body portion F and the rear body portion B corresponds to the latter embodiment.

The

outer cases

12F and 12B have a waist portion corresponding to the waist region T and extending in the front-rear direction. In this embodiment, the front side outer package 12F does not have a portion corresponding to the middle region L, but the rear side outer package 12B has a hip cover portion 14 extending from the waist region T toward the middle region L. Although not shown, a groin cover portion extending from the waist region T toward the middle region L may be provided on the front-side outer cover 12F, or a groin cover portion may be provided but no hip cover portion may be provided, or a portion corresponding to the middle region L may not be provided on both the front-side outer cover 12F and the rear-side outer cover 12B. In the illustrated embodiment, the lower edge of the hip cover portion 14 is formed linearly in the width direction in the same manner as the lower edge of the front side outer package 12F, but may be curved so as to approach the waist opening side as it goes to the outside in the width direction.

As shown in fig. 3 to 5, the

outer cases

12F and 12B are formed by joining the outer sheet layer 12S and the inner sheet layer 12H together by joining means such as hot melt adhesive or fusion bonding. The sheet forming the outer sheet layer 12S and the sheet forming the inner sheet layer 12H may be a common single sheet as in the embodiment shown in fig. 5, or may be separate sheets as in the embodiment shown in fig. 8. That is, in the former case, the inner sheet layer 12H and the outer sheet layer 12S are formed by an inner portion and an outer portion of one sheet folded back at the edge of the waist opening WO (or the edge on the crotch side). In the former system, there is an advantage that the number of sheets is small, and in the latter system, there is an advantage that the offset is less likely to occur when the inner sheet layer 12H and the outer sheet layer 12S are bonded.

The sheet used for the outer sheet layer 12S and the inner sheet layer 12H may be used without particular limitation, but a nonwoven fabric is preferable, and for example, a nonwoven fabric composed of olefin-based fibers such as polyethylene and polypropylene, synthetic fibers such as polyester and polyamide, or mixed fibers or composite fibers using two or more of these fibers may be used. Further, the nonwoven fabric may be produced by any process. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a hot-rolling method, a melt-blowing method, a needle-punching method, a hot-air method, and a point-bonding method. When a nonwoven fabric is used, the weight per unit area is preferably about 10 to 30g/m ² 。

The total weight of the

outer cases

12F and 12B is preferably about 20 to 60g/m ² 。

(expansion region and non-expansion region)

In the

outer bodies

12F and 12B, in order to improve the fit to the waist of the wearer, elongated elastic members (transverse elastic members) 15 to 19 such as rubber strings are provided between the outer sheet 12S and the inner sheet 12H in the width direction at the waist lower portion, and are formed with stretchable regions that elastically stretch in the width direction in accordance with the stretching of the elastic members. In this stretch region, the outer sheet layer 12S and the inner sheet layer 12H contract with contraction of the elastic member in a natural length state, and wrinkles or folds are formed, and when the outer sheet layer 12S and the inner sheet layer 12H are stretched in the longitudinal direction of the elastic member, they can be stretched to a predetermined elongation as follows: they are extremely elongated without wrinkles. As the elongated elastic members 15 to 19, synthetic rubber or natural rubber may be used. The

outer sheets

12F and 12B are bonded to each other by the outer sheet 12S and the inner sheet 12H, and the elongated elastic members 15 to 19 interposed therebetween are fixed by at least one of a hot-melt adhesive by various coating methods and a fixing means by material fusion such as heat sealing or ultrasonic sealing. Since flexibility is impaired when the entire surfaces of the

outer cases

12F and 12B are firmly fixed, it is preferable that the portions other than the adhesion portions of the elongated elastic members 15 to 19 are not adhered or weakly adhered. In the illustrated embodiment, the structure is as follows: the hot melt adhesive is applied only to the outer peripheral surfaces of the elongated elastic members 15 to 19 by application means such as a coating gun or a glue nozzle and sandwiched between the two

sheet layers

12S and 12H, whereby the elongated elastic members 15 to 19 are fixed to the two

sheet layers

12S and 12H and the two

sheet layers

12S and 12H are fixed to each other only by the hot melt adhesive applied to the outer peripheral surfaces of the elongated elastic members 15 to 19. The elastic members 15 to 19 may be fixed to the outer sheet layer 12S and the inner sheet layer 12H only at both ends in the stretch direction in the stretch region.

More specifically, the plurality of waist elastic members 17 are attached between the outer sheet 12S and the inner sheet 12H at the waist portion W of the

outer bodies

12F and 12B at intervals in the vertical direction so as to be continuous over the entire width direction. Further, 1 or more of the waist elastic members 17 disposed in the region adjacent to the waist lower portion U may overlap the interior body 200, or may be disposed on both sides in the width direction thereof excluding the center in the width direction overlapping the interior body 200. The waist elastic member 17 is preferably provided with about 3 to 22 elastic members having a thickness of 155 to 1880dtex, more preferably about 470 to 1240dtex (in the case of synthetic rubber, in the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm) at intervals of 4 to 12mm ² And particularly preferably about 0.1 to 1.0mm ² ) The elongation of the waist portion W in the width direction based on the arrangement of (2) is preferably 150 to 400%, and particularly preferably about 220 to 320%. In addition, the waist portion W does not need to have waist elastic members 17 of the same thickness or have the same elongation in the front-rear direction, and the elastic members 17 may have different thicknesses or elongations in the upper and lower portions of the waist portion W, for example.

A plurality of waist lower

elastic members

15 and 19 made of an elongated elastic member are attached to the

outer sheets

12F and 12B at the waist lower portion U with a gap therebetween in the vertical direction between the outer sheet 12S and the inner sheet 12H.

The waist lower

elastic members

15 and 19 are preferably made of a material having a low elasticityPreferably, about 5 to 30 pieces of a material having a thickness of 155 to 1880dtex, particularly preferably about 470 to 1240dtex (in the case of synthetic rubber, in the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm) are provided at intervals of 1 to 15mm, particularly preferably 3 to 8mm ² And particularly preferably about 0.1 to 1.0mm ² ) The elongation of the waist lower portion U in the width direction based on the arrangement of (2) is preferably 200 to 350%, and particularly preferably about 240 to 300%.

A plurality of cover elastic members 16 made of an elongated elastic member are attached to the hip cover 14 of the rear outer package 12B at intervals in the vertical direction between the outer sheet 12S and the inner sheet 12H.

The cover elastic member 16 is preferably provided with about 2 to 10 elastic pieces having a thickness of 155 to 1880dtex, more preferably about 470 to 1240dtex (in the case of synthetic rubber, the cross-sectional area is 0.05 to 1.5mm in the case of natural rubber, in the case of 5 to 40mm, more preferably 5 to 20mm, at intervals of 5 to 40mm ² And particularly preferably about 0.1 to 1.0mm ² ) The rubber thread of (3) is preferably 150 to 300%, particularly preferably 180 to 260%, in the elongation of the cover portion in the width direction based on the arrangement.

When the groin cover portion is provided on the front side outer package 12F, the cover portion elastic member may be provided in the same manner.

In the case where the

elastic members

15, 16, and 19 are provided in the range in the front-rear direction including the absorbent body 56 as in the below-waist portion U or the hip cover portion 14 of the illustrated embodiment, in order to prevent the absorbent body 56 from shrinking in the width direction over a part or the entire range thereof, the middle in the width direction (preferably, the entire portion including the inner and outer fixing portions 201) including a part or the entire portion overlapping the absorbent body 56 in the width direction is set as the non-stretchable region A1, and both sides in the width direction are set as the stretchable regions A2. The waist portion W is preferably set as the stretchable region A2 as a whole in the width direction, but a non-stretchable region may be provided at the middle in the width direction as in the waist lower portion U.

(formation of non-stretchable region)

The stretchable region A2 and the non-stretchable region A1 may be formed by: the elastic members 15 to 17, 19 are supplied between the inner sheet layer 12H and the outer sheet layer 12S, the

elastic members

15, 16, 19 are fixed by a hot melt adhesive at least at both ends in the stretching direction in the stretching region A2, the

elastic members

15, 16, 19 are not fixed in the region to be the non-stretching region A1, and the

elastic members

15, 16, 19 are cut by pressing and heating at one position in the middle in the width direction or almost the whole of the

elastic members

15, 16, 19 are finely cut by pressing and heating in the region to be the non-stretching region A1, thereby preserving the stretchability in the stretching region A2 and eliminating the stretchability in the non-stretching region A1.

(design sheet)

In order to improve the external appeal of the product, it is desirable to provide a design sheet in which the design can be visually confirmed. The design sheet is generally formed by printing a design drawing on a design-providing sheet in a colored manner.

This design sheet can be incorporated as a sheet different from the above-described constituent members, but it is economical to form the design sheet by performing color printing on the back surface side of the liquid-impermeable sheet 11.

As a design on the design sheet, as shown in fig. 11, the following example is preferable: a horizontal stripe design approximately parallel to the width direction of the product is provided to express the tone of the young. The size and shape of the horizontal stripe design HS are not particularly limited. For example, the dimensions and intervals in the front-rear direction of the horizontal stripe design HS may be all the same or may be different as in the illustrated example. The dimension of the horizontal stripe design HS in the front-rear direction may also be varied regularly or irregularly in the width direction. More specifically, the front and rear edges of the horizontal stripe design HS may be linear (rectangular as a whole), regular wavy (wavy or cloudy as a whole), irregular wavy, or curved.

The liquid-impermeable sheet 11 as the design-providing sheet is formed with a transverse stripe design HS in the width direction at intervals in the front-rear direction of the disposable diaper, and in the use state, the transverse stripe design can be visually recognized through the crotch cover sheet 12M, the outer sheet 12S, and the inner sheet 12H, for example, from the outside.

In this case, in order to control the position of the design sheet to be attached or to check the position after the attachment, it is preferable to add a so-called alignment mark (distance mark) R in the form shown in fig. 11, for example.

The mode shown in fig. 11 is illustrated by black and white shading, but one example thereof is: the alignment marks R are printed in black and the horizontal stripe design HS contains deep blue 01, red 02, medium blue 03 and light blue 04.

In the black-and-white shading diagram, the black alignment mark R cannot be distinguished from the deep blue 01 horizontal stripe, and therefore, white lines are marked to indicate division into the alignment marks R.

The mode shown in fig. 11 is an example in which the alignment mark R and the horizontal stripe design HS are entirely overlapped, but may be partially overlapped.

An example of the use of the alignment mark R will be described later.

< second pants-type disposable diaper >

The first pants-type disposable diaper shown in fig. 1 to 6 has a structure in which an inner body 200 is provided between front and rear

outer bodies

12F and 12B.

Instead of this first pants-type disposable diaper, as shown in fig. 7 to 10, a second pants-type disposable diaper having the following structure may be used: the inner body 200 is provided inside the outer sheet layer 12S and the inner sheet layer 12H that are not divided into the front and rear.

When the components of the second pants-type disposable diaper are substantially the same as those of the first pants-type disposable diaper, the same reference numerals are used and the description thereof is omitted.

In the second pants-type disposable diaper, a front bending elastic member 70F is provided between the outer sheet layer 12S and the inner sheet layer 12H of the front body portion F, and the front bending elastic member 70F is arranged so as to bulge from the

side seal portions

12A, 12A on both sides toward the crotch portion side and is fixed by a hot melt adhesive. Further, a back bending elastic member 70B is provided between the outer sheet layer 12S and the inner sheet layer 12H of the back body portion B, and the back bending elastic member 70B is arranged so as to bulge out from the

side seal portions

12A, 12A on both sides toward the crotch side and is fixed by a hot melt adhesive.

When the position of the front curved elastic member 70F and the end edge position of the intermediate sheet 40 extending toward the crotch side in fig. 7 are comparatively observed, the front curved elastic member 70F is disposed so as to cross so as to cover the end portion of the intermediate sheet 40 extending toward the crotch side, whereby the intermediate sheet 40 positively contacts the skin of the wearer, which is optimal for improving the absorption of urine in the intermediate sheet 40.

The first pants-type disposable diaper and/or the second pants-type disposable diaper can be provided with sheets.

As described above, for example, in the liquid-impermeable sheet 11 as the design imparting sheet, the transverse stripe design HS in the width direction is formed so as to be spaced apart in the front-rear direction of the disposable diaper, and in the use state, the transverse stripe design can be visually recognized through, for example, the crotch cover sheet 12M, the outer sheet layer 12S, and the inner sheet layer 12H from the outside in the first pants-type disposable diaper, and the transverse stripe design can be visually recognized through the outer sheet layer 12S and the inner sheet layer 12H in the second pants-type disposable diaper.

The alignment mark R in the design sheet can be used for control of the attachment position of the design sheet and position confirmation after attachment in the manufacturing process of the disposable diaper.

That is, as shown in fig. 12, which is a conceptual explanatory view, the manufacturing process includes the following steps: the liquid-impermeable sheet 11 as a design sheet, which is continuously conveyed in the production line direction at a position on the back surface side of the absorber 56 in the product state, is cut transversely at a position between the absorbers 56, 56 adjacent in the production line direction after the absorbers 56 are intermittently arranged in the production line direction.

The liquid-impermeable sheet 11 has alignment marks R, R formed on both sides in the production line direction. The alignment mark R, R is a color-printed mark having a color difference distinguishable from the horizontal stripe design HS, and the liquid-impermeable sheet 11 is conveyed and controlled based on the alignment mark R, R so that the liquid-impermeable sheet 11 is arranged at an appropriate position.

After the absorbent body 56 is disposed, the liquid-impermeable sheet 11 is transversely cut at the cut position CP.

Specifically, the transmitted light amount detection means, for example, the light source 81 and the transmitted light amount detector 82 are disposed in the direction intersecting the absorber 56 on the production line, and when the length Le in the production line direction indicating the amount of light transmitted by the transmitted light amount detector 82 that is equal to or greater than the threshold value is within a predetermined length range, it is determined that the absorber 56 is intermittently disposed in the normal state in the production line direction.

When the length is not within the predetermined length range, it can be determined that the absorbent bodies 56 are intermittently arranged in a non-regular state in the line direction.

With respect to a semi-finished product or a product in which the position of the absorber 56 is irregular, shipment of an irregular product (defective product) can be prevented by removing the product from the production line.

As a result of the absence of the absorber 56 between the absorbers 56, the transmitted light amount increases, and the length Le in the line direction indicating the amount of light transmitted by the transmitted light amount detector 82 that is equal to or greater than the threshold value can be determined as the absence of the absorber 56.

In addition to the case where the lateral stripe design HS is not originally formed at the position corresponding to the space between the absorbers 56, as can be seen from fig. 12, in the case where the lateral stripe design HS is formed at the position corresponding to the space between the absorbers 56, the transmitted light amount is required to be high to a certain degree, and therefore the coloring of the lateral stripe design HS is preferably light (for example, the aforementioned light blue 04). In this case, if the arrangement of the design sheet (liquid-impermeable sheet 11) is shifted, the arrangement of the horizontal stripe design HS is shifted, and there is a concern that: the dark portion of the horizontal stripe design HS is disposed at a position corresponding to a position between the absorbers 56, 56. Therefore, as described above, it is preferable to provide the alignment marks R, R on the design sheet (liquid-impermeable sheet 11) and to arrange the design sheet (liquid-impermeable sheet 11) at an appropriate position.

The lightness L is measured by a color difference meter. In the present invention, a hand-held spectrocolorimeter NF 333 (trade name) of japan electrochromatography, ltd.c., was used, and when the light source was D65, the viewing angle condition was 2 °, and the illumination/light receiving condition was 0 °: under the measurement conditions of a 45c two-beam target spectroscopic method and a measurement diameter of 8mm phi, the luminance was measured in a state where an attached white correction plate was in contact with the back surface of the design sheet.

The lightness of each stripe in the horizontal stripe design is shown in table 1. Also, only the lightness measurement values of the attached white correction plates are also shown in table 1 as reference values.

[ Table 1]

And, found that: when the stripe of the medium blue 03 exists between the adjacent absorbers 56, there is a high possibility that the absorber 56 is erroneously determined to exist although the absorbent core does not exist between the absorbers 56, 56.

In contrast, it was found that: in the case of the horizontal stripe based on the light blue 04, the absorber 56 is not erroneously determined to be present.

As a result, it was found that: the lightness difference Delta between the lightness L of the horizontal stripe design and the lightness L of the ground color (when in contact with white thick paper) of the design-providing sheet needs to be 10 or less.

As shown in fig. 11, the areas Z forming the light color (for example, the light blue 04) are preferably located at both ends of the horizontal stripe group of the darker color. Further, a structure that conforms to the following conditions in relation to the length of the absorbent body (absorbent core) 56 is preferable in relation to positional deviation from the design sheet.

[ length of absorbent body (absorbent core) 56 +2 XZ-15 ] mm < design sheet length < [ length of absorbent body (absorbent core) 56 +2 XZ-5 ] mm

< Others >

The above example is an application example to a pants-type disposable diaper, but the present invention can be applied to all types of tape-type disposable diapers and pad-type disposable diapers.

< description of words in the specification >)

Unless otherwise specified in the specification, the following terms in the specification have the following meanings.

As shown in the drawing, the "front-rear (longitudinal) direction" refers to a direction connecting the ventral side (front side) and the dorsal side (rear side), and the "width direction" refers to a direction (left-right direction) perpendicular to the front-rear direction.

"elongation" means a value when the natural length is 100%. For example, an elongation of 200% means the same as an elongation magnification of 2 times.

"weight per unit area" is measured as follows. The sample or test piece is dried and placed in a laboratory or apparatus in a standard state (the temperature in the test site is 23. + -. 1 ℃ C., and the relative humidity is 50. + -. 2%) so as to be in a constant state. The preliminary baking means that the sample or the test piece is made constant in an environment at a temperature of 100 ℃. In addition, the fibers having a official moisture regain of 0.0% may not be subjected to preliminary drying. Using a template (100 mm. Times.100 mm) for sample selection, a sample having a size of 100 mm. Times.100 mm was cut out from a test piece in a constant amount. The weight of the sample was measured, and the weight per square meter was calculated as a weight per unit area by 100 times.

"thickness" is measured using an automatic thickness gauge (KES-G5 Portable compression measurement program) at a load of 0.098N/cm ² The pressure area is 2cm ² Is automatically measured under the conditions of (1).

The water absorption was measured in accordance with JIS K7223-1996 "method for testing the Water absorption of a super absorbent resin".

The water absorption rate is "time to end point" when JIS K7224-1996 "Water absorption Rate test method for superabsorbent resin" was carried out using 2g of a superabsorbent polymer and 50g of physiological saline.

"expanded state" refers to a state of flat expansion without contraction and relaxation.

The dimensions of the respective portions are not particularly described, and are dimensions in the expanded state, not the natural length state.

The test or measurement is carried out in a laboratory or apparatus in a standard state (in a test site, the temperature is 23 ± 1 ℃, and the relative humidity is 50 ± 2%) without describing the environmental conditions in the test or measurement.

Industrial applicability

The present invention can be applied to the pants-type disposable diaper of the above-described example and the like.

Description of the reference symbols

11: a liquid-impermeable sheet; 12: an exterior body; 12A: a side seal part; 12F: a front side outer package; 12B: a rear-side outer housing; 12H: an inner sheet layer; 12S: an outer sheet layer; 30: a topsheet; 40: an intermediate sheet; 50: an absorbent member; 56: an absorbent body; 58: packaging the sheet; 60: a three-dimensional gather portion; 62: a gusset; 70F: a front bending elastic member; 70B: a rear bending elastic member; 81: a light source; 82: a transmitted light amount detector; 200: an inner body.

Claims

1. A disposable diaper characterized in that it comprises a chassis,

the design sheet has no horizontal stripe design between the edge and the edge of the absorbent body, or the horizontal stripe design has a lightness difference Delta between the lightness L of the horizontal stripe design and the lightness L of the ground color of the design-imparted sheet of 10 or less,

alignment marks are color-printed on both end portions of the horizontal stripe design in the region where the absorber is located so that at least a part of the alignment marks overlap each other.

2. A method for manufacturing a disposable diaper having an absorber interposed between a liquid-permeable top sheet on a use surface side and a liquid-impermeable sheet on a back surface side,

it is characterized in that the preparation method is characterized in that,

the method for manufacturing the disposable diaper comprises the following steps: intermittently arranging the absorbent bodies in the production line direction for the continuous design sheet, and then cutting the design sheet transversely at a position between the absorbent bodies adjacent in the production line direction,

the lateral stripe design is not formed between the end edge of the design sheet and the end edge of the absorbent body, or the lateral stripe design is formed, but the lightness difference Delta between the lightness L of the lateral stripe design and the lightness L of the ground color of the design-providing sheet is within 10,

alignment marks are color-printed on both end portions of the horizontal stripe design in the region where the absorber is located so as to overlap at least a part thereof, and the arrangement of the absorber with respect to the design sheet is controlled based on the alignment marks.

3. The method for manufacturing a disposable diaper according to claim 2,

a transmitted light amount detection member for the absorber is disposed on the production line, and when a length in the production line direction, which indicates a light amount at which a transmitted light amount of the transmitted light amount detection member is equal to or greater than a threshold value, is within a predetermined length range while the absorber is being conveyed together with the design sheet, it is determined that the absorber is disposed in a normal state, and when the length in the production line direction is not within the predetermined length range, it is determined that the absorber is disposed in a non-normal state.