JPH08196566A - Three-dimensional pants-type diaper manufacturing method - Google Patents

Abstract

(57) [Abstract] [Purpose] A method of manufacturing a three-dimensional pants type disposable diaper for infants and incontinent persons. [Structure] A waist opening, leg openings, a front body and a back body, and at least a side flap portion of the diaper,
A continuous diaper having a continuous liquid-permeable topsheet, a continuous liquid-impermeable backsheet, and an absorber placed between the two sheets, which is a method of manufacturing a disposable diaper having elasticity in the width direction of the diaper body. The main body laminate is manufactured by the vertical flow method, cut into individual diaper main bodies between the absorbers, inverted by 90 degrees, widened in the diaper width direction, supplied to the continuous waistband exterior sheet, and manufactured by the horizontal flow method. .

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a three-dimensional pants type disposable diaper, and more particularly to a method for producing a three-dimensional pants type disposable diaper which is used as a diaper for infants or incontinent persons.

[0002]

2. Description of the Related Art A manufacturing method for manufacturing a diaper having elastic side panels and expanding and contracting in the width direction of a diaper body by a vertical flow method with the longitudinal direction of the absorbent body as the flow direction is disclosed.
It is proposed in Japanese Patent Publication No. 140163. Further, there is a manufacturing method in which an absorbent body manufactured by a longitudinal flow method is inverted by 90 degrees and manufactured by a lateral flow method in which the longitudinal direction of the absorbent body is perpendicular to the flow direction, which are disclosed in JP-A-3-176053 and JP-A-4-1-1.
It is proposed in Japanese Patent No. 61152.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the case of the conventional retractable diaper disclosed in Japanese Patent No. 3,
Since there is no elastic member over the entire circumference of the opening corresponding to the waist and the pair of openings corresponding to the thighs of both legs, the fitting of the opening is insufficient and leakage is prevented. There is a problem in that Also,
In the manufacturing method of this break-away type diaper, a step of attaching an elastic elastic member in a stretched state in the width direction of the band-shaped body or cutting the band-shaped body continuous in the longitudinal direction of the liquid-absorbent pad to develop a diaper as a product It is necessary to fold the front and back waist gathers so that they overlap each other from the laminated body in a state, and to join the intermediate members to each other. To perform these steps, complicated and advanced technology is required. . Moreover, since the folding direction of the laminated body matches the conveying direction, the production speed of the manufacturing apparatus is restricted, and this is aimed at achieving the purpose required for a disposable diaper, which is low cost due to mass production. It becomes an obstacle.

On the other hand, in the case of the conventional snap-on type diaper disclosed in JP-A-3-176053 and JP-A-4-161152, as in the case of the previous snap-on type diaper, the thighs of both legs are formed. Since the elastic member does not intervene over the entire circumference of each of the pair of openings corresponding to, there is a problem in that the fitting of these openings is insufficient and leakage is prevented. Further, in the manufacturing method of the removable diaper, since the elastic elastic member has elasticity in the conveying direction, it is difficult to appropriately adjust the tension when the elastic elastic member serving as the waist belt is conveyed, As a result of the limited production speed, mass production of disposable diapers cannot be achieved at a low price. In this way, the conformability and fit to the wearer and the production efficiency of the product are in a contradictory relationship. The higher the quality, the higher the production cost, and the usability must be sacrificed to produce at low cost. There was a problem. The present invention overcomes the above problems,
An object of the present invention is to provide a diaper that has a good fit property, does not leak excrement, has excellent moisture permeability, has a good feel on the skin, and is more economical.

[0005]

In order to achieve the above object, the present invention provides an absorbent main body comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body disposed between these sheets. A sheet having at least the outermost layer sheet and side sheets arranged on both side portions of the outermost layer sheet excluding the central region in the longitudinal direction, and a front body, a back body, and a width formed in a region in which the side sheet is arranged. And an absorbent member having a side flap portion that expands and contracts in a direction, the absorbent main body is joined to a central region in the longitudinal direction of the outer member, and the side edge portions of the side flap portion of the outer member facing each other are formed. A method for manufacturing a three-dimensional pants type disposable diaper in which a waist opening and a pair of leg openings are joined to form a waist opening and a stretchable elastic member is arranged along the leg opening. The continuous web to be the material of the liquid-permeable top sheet, and the central region between the continuous web to be the material of the liquid-impermeable back sheet, the absorber is arranged at a predetermined interval in the length direction, Adhesive fixing to form a continuous absorbent body, and one or more continuous leg elastic elastic members capable of forming leg gathers on both sides in the moving direction of the continuous web to be the outermost sheet material. Under stretch, the elastic elastic members are curved and adhered at a predetermined interval along the leg openings of the diaper, and then a continuous web to be used as a material for the pair of side sheets is placed over the continuous elastic elastic members. Then, the step of adhering to form a continuous outer packaging member, and arranging the continuous absorbent body in the central region in the moving direction of the continuous outer packaging member, fixing it to form a continuous diaper body, and then between adjacent absorbent bodies. Continuously in place The step of cutting the diaper body to form individual diaper bodies, the step of inverting the cut individual diaper body by 90 degrees with respect to the moving direction while maintaining the shape before cutting, and the inverting step. An extension step of extending the diaper body in the moving direction more than the width of the material used, and aligning the diaper bodies in the extended state so that the longitudinal side edges of adjacent diaper bodies contact each other, and then the diaper body A continuous web to be used as a material for the waistband exterior sheet in a non-stretched state so as to sandwich both edges of the diaper main body connected body so as to sandwich both edges in the moving direction. A step of folding the absorbent body inside from the center and stacking the pair of waistband continuous webs, and the individual diapers of the folded connected body of diapers. A three-dimensional underpants type merging machine characterized by having the steps of joining both side edges of the body and then cutting the diaper body connecting body along the boundary line between the individual diaper bodies and simultaneously cutting the outside of the leg gather. It lies in the method of manufacturing diapers.

Further, according to the present invention, before the step of extending the diaper body in the moving direction by more than the width of the material used, the longitudinal side edges of the adjacent diaper bodies are adhesively fixed to each other to form a continuous laminated body. There is a method for manufacturing a diaper using a three-dimensional pants type, which is characterized by including the step of:

The present invention further provides a liquid-permeable top sheet, a liquid-impermeable back sheet, an absorbent main body composed of an absorbent body disposed between these sheets, at least an outermost layer sheet, and the outermost layer sheet. An exterior member having side sheets arranged on both sides except the central region in the longitudinal direction, and having a front body, a back body, and side flap portions that are formed in the region where the side sheets are arranged and expand and contract in the width direction. The absorbent main body is joined to a central region in the longitudinal direction of the exterior member, and the opposite side edges of the side flaps of the exterior member are joined to form a waist opening and a pair of leg openings. A method for manufacturing a three-dimensional pants-type diaper in which a stretchable elastic member is arranged along the waist opening and the leg opening, the liquid permeable topsheet material being A continuous web to the center area between the continuous web should be liquid-impermeable backsheet material,
The step of arranging the absorbent bodies at a predetermined interval in the length direction thereof and adhering and fixing them to form a continuous absorbent body, and the leg gathers can be formed on both sides in the moving direction of the continuous web to be the material of the outermost layer sheet. One or more continuous elastic members that should be the leg opening elastic members are stretched and curved at predetermined intervals along the leg openings of the diaper to be bonded and arranged, and then used as a pair of side sheet materials. A continuous web that should be placed over the continuous elastic member, and bonded to form a continuous exterior member, and the continuous absorbent main body is placed in the moving direction central region of the continuous exterior member and fixed. Forming a continuous diaper body, and then cutting the continuous diaper body at a predetermined position between adjacent absorbent bodies to form individual diaper bodies; and maintaining the shape of the individual cut diaper bodies before cutting. Then move direction And at the same time it inverted 90 degrees for,
Inversion / extension step of extending the inverted diaper body in the moving direction beyond the width of the material used, and aligning the diaper bodies in the extended state so that the longitudinal edges of adjacent diaper bodies contact each other. Then, so as to sandwich both side edges of the diaper body in the moving direction, a step of supplying a continuous web to be the material of the pair of waistband exterior sheets in a non-stretched state, and forming a joined body of the diaper body by adhesion, Folding the diaper main body connected body from the central portion with the absorbent main body inside, stacking the pair of waistband continuous webs, and both side edges of each of the folded diaper main body connected bodies. Joining the diaper and then cutting the diaper body connector along the boundary between the individual diaper bodies, while simultaneously cutting the outside of the leg gathers. Resides in the method of producing a three-dimensional pants-type disposable diaper and said.

[0008]

In the method for producing a three-dimensional pants type diaper of the present invention, at least the side flap portion of the diaper is made of a material that expands and contracts in the width direction of the diaper body, and a waistband exterior sheet is made of a non-elastic material. By using and widening the attachment of the diaper body to the waist band, it is possible to efficiently produce a diaper with a good waist opening fit. In addition, the three-dimensional pants type disposable diaper made by this manufacturing method has elastic elastic members around the entire circumference of the waist opening and leg openings, and the side flaps further expand and contract to support the wearer in a wearer-like manner. As it fits neatly around your waist, you can wear it comfortably with minimal leakage.

[0009]

The present invention will now be described in more detail with reference to the drawings showing examples of the present invention, but the present invention is not limited to these examples. FIG. 1 is a perspective view of a three-dimensional pants type disposable diaper, and FIG. 2 is a perspective view showing a state in which a side seam of the three-dimensional pants type disposable diaper is unfolded and expanded, and an elastic elastic member is stretched and fixed.

A three-dimensional pants type disposable diaper 1 has a waist opening 2 and leg openings 3, and elastic elastic members 4 and 5 are attached to the entire circumference of the openings. The front seam 6 and the back seam 7 are formed to extend between the front seam 6 and the back seam 7, and the side seams 8 are joined to each other. Side seams 8
The outermost layer sheet 14 is folded at the center portion in the width direction so that the absorbent main body 12 is on the inside, and the front body 6 and the back body 7 are overlapped and joined with their both side edges protruding outward. There is. The joining of the both side edges can be performed by a single treatment or a combination of treatments such as hot melt adhesive, pressure melting, and ultrasonic wave. Further, the joined state of the both side edges may be a state in which the both side edges are protruded inward, or one side edge is placed outside and the other side edge is placed inside, and the like.

FIG. 3 is an exploded perspective view of the exterior member 16 and the absorbent main body 12 of the three-dimensional pants type diaper shown in FIG. 4 is a sectional view taken along the width direction of the central portion of the three-dimensional pants type disposable diaper shown in FIG. 2, and FIG.
FIG. 6 is a cross-sectional view taken along line YY of the three-dimensional pants type disposable diaper along the longitudinal direction of the waist opening, and FIG. 6 is an exploded perspective view of the three-dimensional pants type disposable diaper. 7 to 8 show main steps for manufacturing a three-dimensional pants type disposable diaper according to the present invention. In the following description, all the constituent materials of the three-dimensional pants type diaper are moved on the production line toward the final step of the production.

In FIG. 7, in the central region between the continuous webs 109 and 110 which are to be the materials of the liquid-permeable top sheet 9 and the liquid-impermeable back sheet 10, the absorber is arranged in the moving direction from right to left in the figure. 11 are arranged at a predetermined interval so that the longitudinal direction of the absorbent body 11 is aligned, and are bonded and fixed to form a continuous absorbent main body 112 that can become the absorbent main body 12. At least the width of the absorbent body 11 is extended at both side edges of the continuous absorbent main body 112 in the moving direction between the two sheets while extending one or more pair of continuous elastic members 113 which should be the flap elastic members 13. Adhesively arranged on the crotch part of the central area in the direction.

Leg opening stretchable elastic members 5 capable of forming leg gathers on both side edges of the continuous web 114 to be the material of the outermost layer sheet 14 in the moving direction from right to left in the drawing.
One or more pair of continuous elastic members 105 to be formed are stretched, curved and supplied at a predetermined interval along the leg openings of the diaper, and arranged by bonding. The intermediate sheet 26 of the outermost layer sheet 14 is provided at the central portion in the moving direction of the continuous web 114.
The continuous web 126 to be the material of the above is arranged and adhered and fixed. Further, so as to cover the continuous elastic member 105,
A pair of continuous webs 115, which are materials for the side sheet 15 having elastic elasticity, are supplied to the side flap portions 20 of the diaper, and are bonded and fixed to form a continuous exterior member 116.

The continuous exterior elastic member 116 is arranged so that the widthwise central region of the absorbent body of the continuous absorbent main body 112 coincides with the portion where the space between the pair of continuously extending elastic members 105 curvedly arranged is narrow, and is fixed by adhesion. To form a continuous diaper body 117. The continuous diaper body 117 is cut at a predetermined position between the absorbers to form the diaper body 17, and the obtained diaper body 17 is kept in the shape before cutting, and the diaper body 17 is moved in the moving direction 90.
Flip over. In FIG. 8, the inverted individual diaper bodies 17 are extended in the moving direction more than the width dimension of the material used with the topsheet 9 facing upward, and the diaper bodies 17 in the extended state are adjacent to each other. The continuous webs 118 to be used as the material for the pair of waistband exterior sheets 18 are non-stretched so that the two longitudinal edges of the diaper 17 are aligned so as to be in contact with each other, and then a part of the diaper body 17 is partially overlapped with the both lateral edges of the diaper body 17. The diaper body 17 supplied in the state
Adhesive fixing at the overlapping part with both edges in the moving direction. The production efficiency can be improved by performing the 90-degree reversal of the diaper body 17 and the extension in the moving direction at the same time.

The pair of waistband continuous webs 1
At 18, one or more continuous stretchable elastic members 104, which should be the waist opening stretchable elastic members 4, are stretched under the web 1
It is arranged within a half of the width of 18 and fixed by adhesion, and then the web 118 is folded back at its center so as to cover the continuous elastic member 104, and both side edges of the diaper body 17 in the moving direction are sandwiched and fixed by adhesion. Then, at the same time as forming the waist gather part, the adjacent individual diaper bodies 17 are
The diaper main body connected body 129 is formed by connecting the both side edges in the longitudinal direction in contact with each other. The diaper body connected body 1
29 is folded with the absorbent main body 12 inside, and is bent along the center line in the moving direction, and the pair of waistband continuous webs 118 are superposed. Both side edges of the individual diaper bodies 17 of the folded diaper body coupling body 129 are joined by heat sealing, and then the diaper body coupling body 12 is provided along the boundary line between the adjacent individual diaper bodies 17.
At the same time as cutting 9 out, the outside of the leg gathers is cut off to obtain a diaper 1 by using individual three-dimensional pants type.

Further, in the manufacturing method of the present invention, after forming the diaper main body connected body 129, the leg gathers are cut off to form leg openings, and then the diaper main body connected body 129 is attached to the absorbent main body 12. Inside, and bent through the center line in the moving direction, the pair of waistband continuous webs 118 are overlapped, and both side edges of the individual diaper body 17 of the folded diaper body connected body 129 are heat-sealed. After joining, the diaper body connecting body 129 is cut along the boundary line between the adjacent individual diaper bodies 17, and the individual three-dimensional pants-type disposable diaper 1 is cut.
May be used.

As shown in FIGS. 3 to 6, the three-dimensional pants type disposable diaper 1 manufactured according to the present invention basically comprises an exterior member 16, an absorbent main body 12 and a waist band 19. . As shown in FIGS. 3 and 6, the absorbent main body 12 includes a liquid-permeable top sheet 9, a liquid-impermeable back sheet 10, and an absorbent body having a length between the two sheets and a width smaller than the both sheets. 11, the back sheet portion extending laterally from the absorbent body is folded back onto the absorbent body to form a flap 21, and at the same time, the absorbent body 1
The overlapping portions of the top sheet 9 extending to the outside of the absorbent body 11 and the folded flap 21 are bonded to each other in both end regions along both side edges of the sheet 1.

At least one flap elastic elastic member 13 is provided along at least a part of the length of each free edge of the flap 21 arranged in the longitudinal direction on the upper surface of the absorber, and the flap elastic elastic member 13 is provided. If left unconstrained, the flap portion elastic elastic member 13 contracts freely, and each free edge of the flap on which the flap elastic elastic member 13 is arranged rises from the base end portion 28, and the absorber 1
The backsheet 10 forms a pouch together with the absorbent body 11 so that the backsheet 10 is separated from 1 and has a gather.

In the above embodiment, the backsheet 10 portion extending laterally from the absorber 11 is folded back onto the absorber,
The flap 21 is formed by fixing its longitudinal ends, but the flap 21 does not fold the backsheet 10 portion extending laterally from the absorbent body 11 onto the absorbent body and keeps it as it is. In this state, one or more flap elastic members 13 may be arranged along at least a part of both side edges. The top sheet 9 used here is a liquid-permeable sheet, and for example, a liquid-permeable nonwoven fabric made of polyethylene, polypropylene, or other thermoplastic fiber is used.

The flap elastic elastic member 13, the leg opening elastic elastic member 5 and the waist opening elastic elastic member 4 arranged at the free edge of the flap 21 are usually urethane film, urethane thread, urethane foam, thread rubber, etc. What is used in the disposable diaper can be used as it is. Further, the elastic elastic members are respectively arranged in a stretched state at the free end of the flap, the leg opening and the waist opening, and are bonded and fixed by a hot melt adhesive.

The absorbent body 11 is preferably made of fluff pulp as a main material in combination with a superabsorbent polymer, and other absorbent paper alone or a mixture or laminate of heat-fusible fibers is used. Further, as shown in FIG. 4, it is preferable that a fluff pulp is mixed in the upper layer 22, a fluff pulp and a super absorbent polymer are mixed or laminated in the lower layer 23, and the mixture is further wrapped with a tissue. The shape of the absorber 11 may be an hourglass shape or a rectangular shape, but the hourglass shape can obtain a better fit.

The back sheet 10 is preferably a liquid impermeable polyethylene sheet, for example, a moisture impermeable sheet such as a polyethylene sheet having micropores or a moisture impermeable liquid sheet formed by adding a filler to a thermoplastic resin and stretching. It is comfortable without worrying about stuffiness. The backsheet 10 needs to have a thickness of 20 to 40 μm. As shown in FIG. 4, the flap 21 of the backsheet 10 is composed of a composite sheet of a liquid impermeable sheet 24 and a nonwoven fabric 25, which are separate from the backsheet 10. As the composite sheet, a back sheet 10 is provided so that a non-woven fabric for improving the touch is arranged on the side around the legs that touches the skin.
A composite material is used that is laminated so as to wrap polyethylene, which is thinner and softer than the other. In this case, it is necessary that the composite sheet has a polyethylene of 5 to 20 μm and the nonwoven fabric has a basis weight of 10 to 25 g / m ² .

The composite sheet comprising the liquid impermeable sheet 24 and the non-woven fabric 25 may be a composite sheet in which the liquid impermeable sheet 24 is laminated on the entire inner surface of the non-woven fabric 25 as shown in FIG. It may be any composite sheet or the like in which the film is stuck from the base end portion 28 of the flap to the free edge except a part of 25. The laminating method of the composite sheet is an extrusion laminating method, a dry laminating method,
Any of pressure fusion bonding by hot embossing, bonding with a hot melt adhesive, ultrasonic bonding and the like may be used.

The side sheet 15 having elastic properties, which is attached to the side flap portion 20 of the diaper, is made of an elastomer nonwoven web alone or a polyester fiber such as polyethylene terephthalate fiber or a polyolefin fiber on at least one side of the elastomer nonwoven web. A web obtained by hydroentangling or laminating fiber layers made of a material selected from the group including polyamide fibers such as nylon fibers, cellulose fibers such as cotton fibers, pulp fibers and mixtures thereof. Further, a polyurethane-based film having a thickness of 5 to 40 μm and having moisture permeability and elasticity,
A web obtained by hydroentangling or laminating the fiber layer on the elastomer nonwoven web on at least one side of a natural rubber sheet or a foamed sheet, or a laminate obtained by laminating and laminating hydroentangled nonwoven fabric may be used.

The laminated lamination may be partial in the central region of the web, one side edge or the like. The method for laminating and laminating may be any of pressure fusion bonding by hot embossing, bonding with a hot melt adhesive, ultrasonic bonding and the like. The side sheet 15 has a basis weight of 20 to 70 g / m ² , elastic stress at 50% elongation of 300 g / 25 mm width or less in one longitudinal and transverse direction, and recovery rate of 80% or more at stress relaxation. Is preferred.

As the non-stretch elastic outermost layer sheet 14,
Polyester fiber such as polyethylene terephthalate fiber, polyolefin fiber, polyamide fiber such as nylon fiber, cellulose fiber such as cotton fiber, obtained by hydroentangling fibers selected from materials including pulp fibers and mixtures thereof, A hydrophilic or water repellent nonwoven fabric is used. These non-woven fabrics stretch when a tensile force is applied, but when they are released from the tensile force, they do not have a contracting force to return to their original state.

The outermost sheet 14 formed of the sidesheet 15 attached to the side flap portion 20 of the outermost sheet 14 has a property of being easily stretched when a tensile force is applied, such as a hydroentangled nonwoven fabric. The outermost sheet 1 works by suppressing elongation and maintaining adhesion to the absorbent main body 12, and by forming the side sheet 15 with a sheet having elastic elasticity, a stronger tensile force acts.
Even when irreversible elongation occurs in No. 4, the outermost sheet 1 due to the contracting force of the side sheet 15 having elastic elasticity properties.
4 is returned to its original state, and the original fit and leak prevention function are not impaired.

As shown in FIG. 4, the absorbent main body 12 is attached to the exterior member 16 via an adhesive region 27 provided on the intermediate sheet 26 covering the central portion of the outermost layer sheet 14. The adhesive region 27 is made of a hot melt adhesive, and various shapes such as a linear shape, a broken line shape, a dot shape, a curved shape, and a spiral shape can be applied to the whole or part of the intermediate sheet 26. From the point that the absorbent main body 12 is well adhered to the exterior member 16 and the wearer has a good feel when wearing the diaper, from the two straight lines provided along the both side edges of the intermediate sheet 26. What
Alternatively, it is preferable to use an H-shaped one formed by combining a straight line provided over the entire length of the central portion of the intermediate sheet 26 in the longitudinal direction and two straight lines provided along the waist opening of the intermediate sheet. At the time of wearing the diaper, the flap 21 of the absorbent main body 12 rises at the center in the longitudinal direction by the contracting force of the flap elastic member 13 provided at the flap free edge, and always comes into close contact with the body of the diaper wearer.
A pouch is formed between the free edge and the flap proximal end 28 to prevent leakage.

As shown in FIG. 4, the flap 21 is located inside the elastic member 5 of the leg opening. When the flap 21 is formed by using a composite material in which the non-woven fabric 25 is present outside the both side edges of the liquid impermeable sheet 24, and the flap 21 provided with the elastic portion 13 for the flap portion is formed, the feel is better, You can get a good fit without the hassle. Further, as shown in FIGS. 4 and 7, the side sheet 15 (1
In the central region of the outermost layer sheet 14 (114) where 15) is not laminated, an intermediate sheet 26 (126) made of a polyethylene sheet or the like is attached to reinforce the portion.

As the intermediate sheet 26, a polyethylene sheet having fine pores, a breathable sheet obtained by adding a filler to a thermoplastic resin and stretching, a mesh sheet, a non-woven fabric, or the like is used, and if the breathability or the breathability is imparted, there is a fear of getting stuffy. Is more comfortable than. Furthermore, by disposing a plurality of elastic elastic members 5 in the leg openings 3, it is possible to fit a wide planar region well around the legs and minimize leakage from around the legs. As shown in FIG. 4, the side edge of the side sheet 15 and the side edge of the intermediate sheet 26 overlap and adhere to each other. The adhesive width is preferably 1 to 20 mm from the side edge of the side sheet 15 on the center side of the diaper.

If a sheet having ventilation and water permeability such as a non-woven sheet is used as the waist band exterior sheet 18, there is no fear of getting stuffy and the sweat of the wearer can be absorbed, so that it is comfortable to the touch and comfortable. Further, it is possible to enhance leakage prevention by using a water repellent non-woven fabric or the like. As the waist opening stretchable elastic member 4 arranged in the stretched state on this sheet, urethane thread, thread rubber, urethane film, urethane foam or the like is used.

As shown in FIGS. 5 and 8, the waistband exterior sheet 18 (118) is attached to the diaper body 17 by the side of the upper surface of the pair of waistband continuous webs 118 in the non-stretched state in the sheet moving direction. Outermost layer sheet 1 of the diaper body 17 in which a part of the edge extends in the waist width direction
4, the intermediate sheet 26, the back sheet 10, the top sheet 9 and the like are arranged and adhered and fixed so as to overlap with at least a part of both longitudinal edges where the diaper body 17 is overlapped.
It is made by folding back at the central portion in the moving direction of the continuous web for a waistband so that the longitudinal edges of the are sandwiched in a U shape.

FIG. 9 further shows another embodiment of the disposable diaper according to the present invention. In this embodiment, a diaper in which the absorbent body portion does not have a pad structure is shown. 7 and 8, the diaper of this embodiment has one or more pair of leg openings capable of forming leg gathers on both side edges in the moving direction of the continuous web 114 to be the material of the liquid impermeable outermost sheet 14. Stretchable elastic member 105 which should be a stretchable elastic member
Is stretched and curved at a predetermined interval along the leg openings of the diaper body, and the adhesive is placed. In the central region of the continuous web 114 to be the material of the outermost layer sheet 14, the absorbers 11 are arranged at predetermined intervals in the length direction and fixed by adhesion.
A continuous web 109 to be the material of the liquid-permeable top sheet 9 is supplied so as to cover the absorber, and is fixed by adhesion. A continuous web 115 to be a material for the pair of side sheets 15 is supplied to the side flaps of the diaper so as to cover the continuous elastic member 105 to be the leg opening elastic member capable of forming the leg gathers, and the side webs are bonded to each other. Fix it into a continuous laminate.

In the diaper of FIG. 9, a flap 21 having a flap elastic elastic member 13 is formed on the absorber. At least one flap elastic elastic member 13 is arranged in an extended state in the flap 21 at least in the central portion thereof, and is adhered and fixed. When the flap elastic elastic member 13 is left unconstrained, the flap elastic Elastic member 13
Freely contracts and rises, forming a three-dimensional gather. The flaps 21 are free edges on both sides of the topsheet,
It may be formed of any member such as a free edge of the side sheet on the center side of the diaper or a member separate from the top sheet and the side sheet. At this time, the base end portion 28 of the flap exists on the absorbent body.

Outermost layer sheet 14 used in the embodiment of FIG.
Has elasticity, the elastomer nonwoven web alone, or polyester fiber such as polyethylene terephthalate fiber on at least one side of the elastomer nonwoven web, polyolefin fiber, polyamide fiber such as nylon fiber, cellulose fiber such as cotton fiber, Hydro-entangled or laminated webs of fiber layers made of materials selected from the group including pulp fibers and mixtures thereof are used. Further, a web in which the fiber layer is hydroentangled or laminated on the elastomer nonwoven web on at least one side of a polyurethane-based film having a moisture permeability and stretchability of 5 to 40 μm, a natural rubber sheet, and a foamed sheet, It may be a laminate of hydroentangled nonwoven fabrics.

The method of laminating and laminating may be any of pressure fusion bonding by hot embossing, bonding by hot melt adhesive, ultrasonic bonding and the like. Further, the outermost layer sheet 14 has a basis weight of 20 to 70 g / m ² , elastic stress at 50% elongation of 300 g / 25 mm width or less in one longitudinal and transverse direction,
The recovery rate upon stress relaxation is preferably 80% or more.

Further, the side sheet 15 is selected from materials including polyester fibers such as polyethylene terephthalate fibers, polyolefin fibers, polyamide fibers such as nylon fibers, cellulose fibers such as cotton fibers, pulp fibers and mixtures thereof. A hydrophilic or water repellent non-woven fabric obtained by hydroentangling the fibers described above is used. These non-woven fabrics stretch when a tensile force is applied, but when they are released from the tensile force, they do not have a contracting force to return to their original state.

[0038]

As described above, according to the present invention, there is no leakage of excrement, good fit property, excellent moisture permeability, and comfortable touch to the wearer, and more economical. It is possible to provide a general diaper.

[Brief description of drawings]

FIG. 1 is a perspective view of a three-dimensional pants type disposable diaper of the present invention.

FIG. 2 is a perspective view showing a state in which the side seams of the three-dimensional pants type diaper shown in FIG. 1 are released and deployed, and the elastic elastic body is stretched and fixed.

FIG. 3 is an exploded perspective view of an absorbent main body and an exterior member of the three-dimensional pants type disposable diaper of FIG.

FIG. 4 is a cross-sectional view taken along line X-X of the three-dimensional pants type disposable diaper of FIG.

5 is a cross-sectional view taken along the line YY of the three-dimensional pants type disposable diaper of FIG.

FIG. 6 is an exploded perspective view of the three-dimensional pants type disposable diaper of the present invention.

FIG. 7 is a partial plan view schematically showing the first half step of the manufacturing method according to the present invention.

FIG. 8 is a partial plan view schematically showing the latter half step of the manufacturing method according to the present invention.

FIG. 9 is a sectional view showing a three-dimensional pants type disposable diaper of another embodiment, taken along the line XX of FIG. 4.

[Explanation of symbols]

1: Three-dimensional pants type disposable diaper 2: Waist opening 3: Leg opening 4: Waist opening elastic member 5: Leg opening elastic member 6: Front body 7: Back body 8: Side seam 9: Top Seat 10: Backsheet 11: Absorber 12: Absorbent body 13: Flap elastic elastic member 14: Outermost layer sheet 15: Sidesheet 16: Exterior member 17: Diaper body 18: Waistband exterior sheet 19: Waistband 20 : Side flap part 21: Flap 22: Upper layer absorbent body 23: Lower layer absorbent body 24: Liquid impermeable sheet of flap part 25: Non-woven fabric of flap part 26: Intermediate sheet 27: Linear in the central area in the longitudinal direction of the absorbent main body Adhesive area 28: flap base end 104: waist opening elastic elastic member that should be elastic member 105: leg opening elastic Continuous stretchable elastic member to be used as material 109: Continuous web to be used as topsheet material 110: Continuous web to be used as backsheet material 112: Continuous absorbent body 113: Continuous stretchable elastic member to be used as flap elastic elastic member 114: Continuous web that should be the material for the outermost layer 115: Continuous web that should be the material for the side sheet 116: Continuous exterior member 117: Continuous diaper body 118: Continuous web that should be the material for the exterior sheet of the waistband 126: Intermediate Continuous web to be used as sheet material 129: diaper main body connected body

Front page continuation (72) Inventor Kotaro Shinoda 4-7-5 Ginza, Chuo-ku, Tokyo Shin-Oji Paper Co., Ltd.

Claims (3)

[Claims] 1. A liquid-permeable top sheet, a liquid-impermeable back sheet, an absorbent main body composed of an absorbent body disposed between these sheets, at least an outermost layer sheet, and a longitudinal direction of the outermost layer sheet. Having side sheets arranged on both sides except the central region, and consisting of a front body, a back body, and an exterior member having side flap portions formed in the region in which the side sheets are arranged to expand and contract in the width direction, The absorbent main body is joined to a central region in the longitudinal direction of the exterior member, and opposite side edges of the side flaps of the exterior member are joined to form a waist opening and a pair of leg openings. A method for manufacturing a three-dimensional pants-type diaper in which elastic members are arranged along the waist opening and the leg openings, which is a continuous web to be used as a material for a liquid-permeable top sheet. And a step of forming a continuous absorbent main body by arranging an absorber at a predetermined interval in the length direction in the central region between the continuous webs to be the material of the liquid-impermeable backsheet, and adhering and fixing the same. At the leg openings of the diaper, one or more continuous elastic members for leg openings capable of forming leg gathers are stretched on both sides in the moving direction of the continuous web to be the material of the outermost layer sheet. Curved along a predetermined interval to be bonded and arranged, along with a continuous web to be the material of the pair of side sheets, the continuous stretchable elastic member is placed, the step of bonding to form a continuous exterior member, The continuous absorbent body is arranged in the central region in the moving direction of the continuous exterior member and fixed to form a continuous diaper body, and then the continuous diaper body is cut at a predetermined position between adjacent absorbent bodies to cut individual diapers. The process of forming the body A reversing step of reversing the cut individual diaper body by 90 degrees with respect to the moving direction while maintaining the shape before cutting, and extending the reversed diaper body in the moving direction beyond the width dimension of the used material. A pair of waistband exteriors are arranged so that the stretching step and the stretched diaper body are aligned so that the longitudinal side edges of adjacent diaper bodies are in contact with each other, and then the both side edges in the moving direction of the diaper body are sandwiched. Supplying a continuous web to be the material of the sheet in a non-stretched state, and adhering to form a diaper body connected body, and the diaper body connected body,
Bending from the central part with the absorbent main body inside, superposing the pair of waistband continuous webs, and joining both side edges of the individual diaper main bodies of the folded diaper main body connected body, and then the individual diaper main body A method for manufacturing a three-dimensional pants type disposable diaper, which comprises a step of cutting the connected body of the diaper body along a boundary line between the diaper bodies and cutting the outside of the leg gather. 2. Before the step of extending the diaper body in the moving direction by more than the width of the material to be used, a step of adhering and fixing both longitudinal edges of the adjacent diaper bodies to form a continuous laminated body. The method for manufacturing a three-dimensional pants type disposable diaper according to claim 1, characterized in that the method is provided. 3. A liquid-permeable top sheet, a liquid-impermeable back sheet, an absorbent main body composed of an absorber arranged between these sheets, at least an outermost layer sheet, and a longitudinal direction of the outermost layer sheet. Having side sheets arranged on both sides except the central region, and consisting of a front body, a back body, and an exterior member having side flap portions formed in the region in which the side sheets are arranged to expand and contract in the width direction, The absorbent main body is joined to a central region in the longitudinal direction of the exterior member, and opposite side edges of the side flap portion of the exterior member are joined to form a waist opening and a pair of leg openings. A method for manufacturing a three-dimensional pants-type diaper in which elastic members are arranged along the waist opening and the leg openings, which is a continuous web to be used as a material for a liquid-permeable top sheet. And a step of forming a continuous absorbent main body by arranging an absorber at a predetermined interval in the length direction in the central region between the continuous webs to be the material of the liquid-impermeable backsheet, and adhering and fixing the same. At the leg openings of the diaper, one or more continuous elastic members for leg openings capable of forming leg gathers are stretched on both sides in the moving direction of the continuous web to be the material of the outermost layer sheet. Curved along a predetermined interval to be bonded and arranged, along with a continuous web to be the material of the pair of side sheets, the continuous stretchable elastic member is placed, the step of bonding to form a continuous exterior member, The continuous absorbent body is arranged in the central region in the moving direction of the continuous exterior member and fixed to form a continuous diaper body, and then the continuous diaper body is cut at a predetermined position between adjacent absorbent bodies to cut individual diapers. The process of forming the body The cut individual diaper body retains the shape before cutting and is inverted by 90 degrees with respect to the moving direction, and at the same time, the inverted diaper body is extended in the moving direction by more than the width dimension of the material used. A pair of waistband exteriors are arranged so that the stretching step and the stretched diaper body are aligned so that the longitudinal side edges of adjacent diaper bodies are in contact with each other, and then the both side edges in the moving direction of the diaper body are sandwiched. Supplying a continuous web to be the material of the sheet in a non-stretched state, forming a diaper main body connected body by adhesion, and folding the diaper main body connected body from the central part with the absorbent main body inside.
The step of stacking the pair of continuous webs for waistbands, joining both side edges of the individual diaper bodies of the folded diaper body connecting body, and then connecting the diaper body along the boundary line between the individual diaper bodies. A method for manufacturing a three-dimensional pants type disposable diaper, which comprises the step of cutting the body and simultaneously cutting the outside of the leg gather.