JPH08117276A - Manufacture of underpants type diaper - Google Patents

Abstract

PURPOSE: To improve the fitness function of a diaper by bending and jointing a freely stretchable elastic member for throttling a pair of open sections corresponding to the thighs of both legs to both breadthwise ends of a strip material carried in a lengthwise direction in such a state as kept continuous to the opening of the diaper. CONSTITUTION: A strip type back sheet material 25 is carried in a lengthwise direction, and then a liquid absorptive pad 19, a back sheet material 25 and elastic members 18 and 24 are jointed to one another in a stretched condition. A center top sheet 22 forming a two-dimensional gather 23 is superposed on the pad 19 and jointed to a side top sheet 21, thereby providing a continuously laminated body Fd. A laminated body F obtainable from the center top sheet 22 cut along a cutting line is turned by 90 degrees to select a transverse flow system. Furthermore, an elastic member 16 around a waist is jointed to a waist sheet 26 in a stretched condition and jointed to the body F in a superposed state. In addition, a cutout opening 13 around the leg is formed along the curvature of an elastic member 18 and a jointing sheet 27 is cut. As a result, the elastic members 16 and 18 can be arranged at each opening 13 around the waist and leg.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a removable diaper having an opening corresponding to the waist and a pair of openings corresponding to the thighs of both legs.

[0002]

2. Description of the Related Art A removable diaper having an opening corresponding to the waist and a pair of openings corresponding to the thighs of both legs is mounted by closing the left and right side flaps. Compared with a deployable diaper, an adult wearer can easily put on and take off the wearer, and can easily and quickly wear the wearer in a standing posture. Moreover, since the wearable diaper can be worn by an adult wearer as if he / she is wearing underwear rather than as a diaper, it seems that the diaper can be accepted with less resistance than the deployable diaper.

For these reasons, the demand for the removable diaper is increasing in place of the deployable diaper for adults who need a diaper and for infants at the time of weaning. Further, in order to improve the fit of the opening and to improve the overall feeling of wearing, the stretchable material tends to be frequently used.

As a method of manufacturing such a removable diaper, Japanese Patent Laid-Open No. 2-140163 and Japanese Patent Laid-Open No. 3-163163 are available.
The methods disclosed in JP-A-176053 and JP-A-4-161152 are known.

The manufacturing method disclosed in Japanese Patent Application Laid-Open No. 2-140163 is intended for a diaper having a stretchable side sheet on the flank portion, and the transport direction of a rectangular liquid-absorbent pad is changed. A so-called longitudinal flow system set in the longitudinal direction is adopted. Then, a stretchable elastic member serving as a waist gather is joined to the strip-shaped body serving as the back sheet in which the side sheets are joined on both sides in the width direction in the stretched state along the width direction of the strip-shaped body, and the strip-shaped body is cut to absorb the liquid respectively. After obtaining the laminated body having the elastic pad and the pair of waist gathers, the waist gathers of the laminated body are folded in two so as to overlap each other, and the left and right side sheets are joined by the intermediate member.

Further, the manufacturing method disclosed in JP-A-3-176053 and JP-A-4-161152 is
The liquid-absorbent pad is carried into the belt-shaped body serving as the center sheet by a longitudinal flow method, and the belt-shaped body is cut to obtain a laminate having the liquid-absorbent pad. Then, the laminated body is turned 90 degrees to switch to the lateral flow system, and the laminated body is hung over a pair of left and right stretchable elastic members in a stretched state, and a waist belt surrounding the laminated body and the waist. After joining the elastic elastic members, the pair of left and right elastic elastic members are folded in two so as to overlap each other, and the elastic elastic members are intermittently bonded.

[0007]

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 the elastic member does not intervene 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 occurs. There is a problem in that

Further, in the manufacturing method of this breakable type diaper, the step of attaching the elastic member in the stretched state in the width direction of the band-shaped body or cutting the continuous band-shaped body in the longitudinal direction of the liquid absorbent pad to obtain the product It is necessary to fold the laminated diaper in the unfolded state so that the front and rear waist gathers overlap each other and join the intermediate members to each other, and to perform these steps, it is complicated and sophisticated. Technology is required. Moreover, since the folding direction of the laminated body matches the conveying direction, the production speed of the manufacturing apparatus is limited, which is an obstacle to achieving the purpose required for the disposable diaper of low cost by mass production. Become.

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,
Since the elastic member does not intervene over the entire circumference of each of the pair of openings corresponding to the thighs of both legs, the fitting of these openings is insufficient and there is a problem in that leakage is prevented. is there.

Further, in this method for manufacturing a disposable diaper, since the stretchable elastic member has stretchability in the conveying direction, it is necessary to properly adjust the tension when the stretchable elastic member to be the waist belt is conveyed. As a result, the production speed is limited, and as a result, it is impossible to realize the cost reduction by mass production of disposable diapers.

As described above, there is a contradictory relationship between the followability and fit to the wearer and the production efficiency of the product. If the quality is improved, the production cost increases, and the usability is sacrificed for low-cost production. There was a problem that had to be.

[0012]

OBJECTS OF THE INVENTION It is a first object of the present invention to provide a method of manufacturing a snap-on diaper having a good fit for each opening and overall fit.

A second object of the present invention is to provide a method for manufacturing a flexible diaper which can be manufactured at low cost by mass production.

[0014]

A first form according to the present invention is a liquid-impermeable back sheet which forms an opening corresponding to a waist portion and a pair of opening portions corresponding to thigh portions of both legs. A stretchable elastic member provided along the opening of the backsheet and narrowing the openings, and a liquid-absorbent pad provided between the pair of openings of the backsheet, A method of manufacturing a removable diaper having a liquid-absorbent pad and a liquid-permeable top sheet that is superposed on the back sheet with the elastic member interposed therebetween, and is continuously conveyed along the longitudinal direction. Positioning the liquid absorbent pad at a predetermined interval in the central portion of the liquid-impermeable first strip, and a pair of continuous first curved in the widthwise central side of the first strip at a predetermined interval. One elastic member is A step of joining the strips in the width direction on both sides in a stretched state, and a second strip that is continuously conveyed along the longitudinal direction and serves as the surface sheet, is provided with the liquid absorbent pad and the first elastic member. A step of stacking and joining the first strip-shaped member through a member to obtain a continuous laminated body, and cutting the continuous laminated body at predetermined intervals along the width direction thereof, and a rectangle having the liquid-absorbent pad. And a step of rotating the laminated body 90 degrees around an axis perpendicular to the conveying surface while maintaining the shape before cutting, and a third step of continuously conveying the laminated body along the longitudinal direction. A step of superposing and joining the laminated body rotated by 90 degrees to the belt-shaped body at a predetermined interval while maintaining the shape before cutting;
A step of joining the continuous second elastic member to both widthwise side edges of the third strip in an extended state, and along the curved portion of the first elastic member of the laminate adjacent to each other, The step of hollowing out the central portion of the third belt-shaped body together with the laminated body in a substantially circular shape at a predetermined interval, and the widthwise side edges of the third belt-shaped body overlap so that the third belt-shaped body is A step of folding the laminated body in two and a step of forming a flap portion by joining the front and rear end portions along the transport direction of the folded folded body together with the third strip in the width direction thereof, And a step of cutting the third strips located between the flap portions of the adjacent laminates in the width direction thereof.

Here, the back sheet may have the first strip and the third strip.

On the other hand, the second embodiment of the present invention is a liquid-impermeable back sheet having an opening corresponding to the waist and a pair of openings corresponding to the thighs of both legs, and this back surface. An elastic member provided along the opening of the sheet and squeezing the opening, a liquid absorbent pad provided between the pair of openings of the back sheet, and the liquid absorbent pad And a surface sheet which is superposed on the back sheet with the elastic member sandwiched therebetween, which is a method for manufacturing a removable diaper, wherein the central portion of the first strip is continuously conveyed in the longitudinal direction. A step of arranging the liquid absorbent pad at predetermined intervals,
A step of joining a pair of continuous stretchable members that are stretchable in the width direction to both widthwise side edges of the first strip, and a predetermined interval on the widthwise center side of the first strip. Joining a pair of continuous first elastic members that are curved in a stretched state to the elastic members, respectively, and a widthwise side edge of a continuous liquid-permeable second strip that is conveyed along the longitudinal direction. A pair of continuous strip-shaped stretchable members that can extend in the width direction of the second section, and the second strip-shaped body and the stretchable member so that the stretchable member and the stretchable member overlap at least partially. And superimposing and joining the first band-shaped body and the elastic member via the liquid absorbent pad and the first elastic member to obtain a continuous laminated body, and the continuous laminated body in the width direction thereof. Along Cutting at intervals to obtain a rectangular laminated body having the liquid-absorbent pad; maintaining the shape of the laminated body before cutting and rotating the laminated body by 90 degrees about an axis perpendicular to the conveying surface; A step of expanding the laminated body by expanding a portion of the laminated body in which the elastic member and the extending member overlap each other in the width direction, and for the third belt-shaped body continuously conveyed in the longitudinal direction , A step of superposing and joining the laminated body rotated by 90 degrees at a predetermined interval while maintaining the widened state, and a continuous second elastic member in a stretched state on both side edges of the third strip in the width direction. A step of joining, and a step of drawing out a central portion of the third strip-shaped body together with the laminated body in a substantially circular shape at a predetermined interval along a curved portion of the first elastic member of the laminated body adjacent to each other; , Of the third strip Folding the third strip together with the laminate so that both side edges overlap in the direction, and front and rear end portions along the transport direction of the folded half together with the third strip. A step of forming a flap portion by joining in the width direction, and a step of cutting the third strip-shaped body located between the flap portions of the laminates adjacent to each other in the width direction A method of manufacturing a disposable diaper characterized by the above.

Here, the back sheet may have the first strip, the pair of elastic members, and the third strip. The topsheet may have the second strip and the pair of extension members.

The third belt-shaped body is arranged in the width direction at a distance from each other, and has a pair of left and right waist members which are belt-shaped and are continuously conveyed along the longitudinal direction. It may have a ladder-like structure composed of a plurality of connecting sheets joined at a predetermined interval, and a peripheral portion of the laminate is joined to the pair of waist members and two adjacent connecting sheets. .

[0019]

According to the first aspect of the present invention, the liquid-absorbent pads are superposed at a predetermined interval on the central portion of the first belt-shaped body which constitutes a part of the back sheet, and the width direction of the first belt-shaped body is further increased. A pair of first elastic members for forming leg gathers that are curved at a predetermined interval on the center side are joined to both sides in the width direction of the first strip in an extended state. Then, the second strip to be the surface sheet is superposed and bonded to the first strip via the liquid absorbent pad and the first elastic member, and the continuous laminate obtained by this is formed along the width direction thereof. And cut at predetermined intervals to obtain a rectangular laminated body having a liquid absorbent pad by a longitudinal flow method.

Next, the laminated body is rotated 90 degrees around an axis perpendicular to the conveying surface while maintaining the shape before cutting, and thereafter, the transverse flow system is switched. Then, the laminated body in which the shape before cutting is maintained is overlapped and joined to the third strip-shaped body forming a part of the back sheet at a predetermined interval. Further, after the second elastic members for forming waist gathers are joined to the both side edges of the third strip in the width direction in the stretched state, the curved portions of the first elastic members of the laminates adjacent to each other. A central portion of the third belt-like body is cut out along with the laminated body in a substantially circular shape at a predetermined interval to form an opening corresponding to the thighs of both legs.

Thereafter, this third strip is folded together with the laminated body in two so that both side edges of the third strip in the width direction overlap with each other, and in this state, in the conveying direction of the folded two laminated body. The front and rear end portions along the same, that is, the flank equivalent portions are joined together with the third strip body in the width direction to form a flap portion, and the third strip body located between the flap portions of the adjacent laminates is formed. By cutting in the width direction,
(EN) A snap-on diaper in which an opening corresponding to a waist portion is narrowed by a second elastic member and a pair of opening portions corresponding to thigh portions of both legs are narrowed by a first elastic member.

According to the second aspect of the present invention, the liquid-absorbent pad is superposed at a predetermined interval on the central portion of the first strip forming a part of the back sheet. In addition, a pair of elastic members that can extend in the width direction on both side edges of the first band-shaped body in the width direction and that constitutes a part of the back sheet and covers the flank portion are joined together, and the first band-shaped member is formed. A pair of first elastic members for forming leg gathers that are curved at a predetermined interval on the center side in the width direction of the body are joined to these elastic members in an extended state.

On the other hand, a pair of continuous strip-shaped extending members capable of extending in the width direction are joined to both widthwise side edges of the liquid-permeable continuous second strip. Then, the extension member and the second strip are superposed on the first strip and the stretch member via the liquid absorbent pad and the first elastic member so that the extension member and the stretch member overlap at least partially. They are joined together and the continuous laminate obtained thereby is cut at predetermined intervals along the width direction to obtain a rectangular laminate having a liquid absorbent pad by a longitudinal flow method.

Next, the laminated body is rotated 90 degrees around an axis perpendicular to the conveying surface while maintaining the shape before cutting, and thereafter, the transverse flow system is switched. In addition, a portion of the laminated body in which the stretchable member and the stretchable member overlap each other is expanded in the width direction to widen the laminated body, and the laminated body is rotated by 90 degrees while maintaining the widened state of the laminated body, The third strip, which constitutes a part, is superposed and joined at a predetermined interval. Further, after the second elastic members for forming waist gathers are joined to the both side edges of the third strip in the width direction in the stretched state, the curved portions of the first elastic members of the laminates adjacent to each other. A central portion of the third belt-like body is cut out along with the laminated body in a substantially circular shape at a predetermined interval to form an opening corresponding to the thighs of both legs.

Thereafter, this third strip is folded together with the laminated body in two so that both side edges of the third strip in the width direction overlap, and in this state, the third folded body is further folded in the conveying direction of the laminated body. The front and rear end portions along the same, that is, the flank equivalent portions are joined together with the third strip body in the width direction to form a flap portion, and the third strip body located between the flap portions of the adjacent laminates is formed. By cutting in the width direction,
(EN) A snap-on diaper in which an opening corresponding to a waist portion is narrowed by a second elastic member and a pair of opening portions corresponding to thigh portions of both legs are narrowed by a first elastic member.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for manufacturing a removable diaper according to the first aspect of the present invention will be described in detail below with reference to FIGS.

FIG. 1 shows the appearance of the split type diaper in this embodiment, and FIG. 2 shows the appearance of the expanded diaper in a developed state, and FIG. 3 shows a sectional structure taken along line III-III in FIG. . That is, the removable diaper 1 in this embodiment
1 is a waist opening 1 corresponding to the waist portion
2 and a pair of leg openings 1 corresponding to the thighs of both legs
3, a liquid-impermeable back sheet (hereinafter, referred to as a back sheet) 14 that forms the openings 12 and 13,
Waist gather 15 by squeezing the waist opening 12
Elastic member 16 for forming the waist, leg elastic member 18 for forming the leg gathers 17 by squeezing the leg opening 13, and a crotch portion between the leg opening 13 from the crotch side to the ventral side and the hip. And a liquid-absorbent pad 19 extending on each side. Further, the back sheet 14 is joined so as to be deployable as shown in FIG. 2 by peeling off the joining flap portion 20 located on the flank portion thereof. That is, the joining flap portions 20 before and after the back sheet 14 are overlapped from the unfolded state shown in FIG. 2, and these abutting portions are individually subjected to hot melt bonding, pressure melting bonding, ultrasonic melting bonding, or the like. Alternatively, the flexible diaper 11 shown in FIG. 1 can be obtained by appropriately combining and joining.

A polyethylene sheet or the like can be used as the back sheet 14. More preferably, a polyethylene sheet provided with a large number of micropores that do not allow liquid molecules to permeate in order to prevent stuffiness, or a moisture permeable sheet obtained by adding a filler to a thermoplastic resin, or a sheet of these sheets. The composite sheet in which a nonwoven fabric is attached to the outside can be made more comfortable in terms of moisture permeability and touch.

As the liquid absorbent pad 19,
It is preferable to use a combination of fluff pulp and a superabsorbent polymer, and in addition to that, absorbent paper alone or a mixture or laminate of heat-sealing fibers is used, and it is preferable to have a laminated structure in which the whole is wrapped with tissue. In this embodiment, the liquid absorbent pad 19 is formed in an hourglass shape in which the widths of the front and rear ends are widened, but it may be formed in a rectangular shape with a constant width. However,
The hourglass shape can ensure better fit when mounted.

The liquid absorbent pad 19 is used as the back sheet 14
It is located in the center of. In addition, on both sides in the width direction of the liquid absorbent pad 19, leg elastic members 18 as a first elastic member according to the present invention are joined in a stretched state between the back sheet 14 and the pair of left and right side top sheets 21. The leg elastic members 18 are sandwiched between the back seat 14 and the side top seat 21. Further, the liquid-absorbent pad 19 is superposed with the liquid-permeable center topsheet 22 which constitutes the surface sheet of the present invention (hereinafter referred to as the topsheet) together with the side topsheet 21 to provide the liquid-absorbent pad. The center top sheet 22 and the side top sheet 21 are integrally joined at the side edge portion of the pad 19. The three-dimensional gather 2 is provided on both side edges of the center top sheet 22 in the width direction.
A stretchable elastic member 24 for forming 3 is wound in an expanded state and integrally joined to both widthwise side edges of the center top sheet 22.

As the side top sheet 21, a synthetic fiber non-woven sheet made of polyethylene, polypropylene, polyester, or other thermoplastic resin is used, and the side top sheet 21 is preferably hydrophobic.

As the center top sheet 22,
A synthetic fiber liquid-permeable non-woven sheet made of polyethylene, polypropylene, polyester, or other thermoplastic resin is used, but in order to enhance the leakage prevention effect on both side edges of the center top sheet 22 forming the three-dimensional gather 23, It is also effective to apply processing only to both side edges of the center top sheet 22 so as to have hydrophobicity.

Further, the waist elastic member 16 provided along the waist opening 12, the leg elastic member 18 provided along the leg opening 13, or the elastic member 24 for forming the three-dimensional gather 23. It is possible to use urethane thread, urethane tape, rubber thread, etc. as they are, and these are stretched along the hot melt adhesive applied to the predetermined positions of the back sheet 14 and the center top sheet 22. It is fixed by adhesion.

4 to 12 show the procedure for manufacturing the removable diaper 11 according to this embodiment. That is, the strip-shaped backsheet material 25 which corresponds to the first strip-shaped body of the present invention and which constitutes the main part of the backsheet 14 is continuously conveyed along its longitudinal direction (the left-right direction in FIG. 4). The liquid-absorbent pad 19 is intermittently overlapped with the center portion in the width direction at a predetermined position of the transport path at predetermined intervals (see FIG. 4). Next, at a predetermined position on the conveyance path of the backsheet material 25 downstream of this, a predetermined position is set so as to be closest to the side edge of the liquid absorbent pad 19 at the central portion in the longitudinal direction of the liquid absorbent pad 19. A continuous body of leg elastic members 18 curved in the width direction of the back sheet material 25 at intervals is joined to both sides in the width direction of the back sheet material 25 in an extended state (see FIG. 5).

The backsheet material 2 further downstream
At a predetermined position of the conveyance path of No. 5, so that the continuous body of the pair of side top sheets 21 overlaps with the side end of the liquid absorbent pad 19 and the curved portion of the leg elastic member 18,
It is joined to the backsheet material 25 (see FIG. 6). Further, a continuous body of the center topsheet 22 in which three-dimensional gathers 23 are formed by joining elastic members 24 in advance in both widthwise end portions at predetermined positions in the conveying path of the backsheet material 25 downstream of this, is formed. It is superposed on the liquid absorbent pad 19 and joined to the continuous body of the side top sheet 21 (see FIG. 7) to obtain a continuous laminated body F _C.

The above-mentioned continuous body of the side top sheet 21 and the continuous body of the center top sheet 22 constitute the second strip-shaped body of the present invention.

As described above, the continuous body of the leg elastic members 18 is joined to both sides in the width direction of the back sheet material 25 in an extended state by the vertical flow system, and the continuous body of the center top sheet 22 having the three-dimensional gathers 23 is also formed vertically. Since it can be superposed on the liquid absorbent pad 19 by the flow method, the work can be efficiently carried out.

Thereafter, at a predetermined position on the conveying path of the backsheet material 25 downstream of the above, a back located at an intermediate portion of the liquid absorbent pads 19 adjacent to each other along the conveying direction of the continuous laminated body F _C described above. The sheet material 25, the continuous body of the elastic members 18 around the legs, the continuous body of the side top sheets 21, and the continuous body of the center top sheets 22 are cut at predetermined intervals along a cutting line C ₁ shown in FIG. A rectangular laminated body F having the absorbent pad 19 is obtained. Then, in order to prevent the laminated body F from being deformed by the contraction of the leg elastic members 18 and the elastic members 24 due to the free opening, the conveying surface (the surface parallel to the paper surface of FIG. 8) is maintained while maintaining the state before cutting.
The laminated body F is turned by 90 degrees around an axis perpendicular to the vertical axis, and thereafter, the lateral flow system is switched.

As a method for holding the laminated body F in the state before cutting, prior to the cutting operation of FIG. 8, a backing sheet material shown in the right side of FIG. 25 is moved in synchronism with the back sheet material 25 while being in contact with the back surface of the back sheet 25, and the back surface of the back sheet material 25 is evacuated from the front surface of the delivery pallet to form the laminated body F after cutting into the delivery pallet. It can be sucked and held by rotating the carrier pallet 90 degrees.

On the other hand, the backsheet material 25 is conveyed in parallel along the conveyance direction of the backsheet material 25 at intervals slightly narrower than the length dimension L (see the left side of FIG. 8) of the laminated body F after turning 90 degrees. The left and right side edges of the connecting sheet 27 are joined at a predetermined interval between a pair of left and right waist sheets 26 that are continuous to obtain a third strip 28 having a ladder structure (FIG. 9).
reference).

The waist sheet 2 surrounding the waist.
As a continuous body of 6, polypropylene, polyethylene,
Alternatively, a nonwoven fabric made of synthetic fibers made of polyester or other thermoplastic resin can be used.
However, it is preferable that the nonwoven fabric is relatively bulky and highly flexible in order to improve the fit around the waist when it is attached. Further, since the connecting sheet 27 is used for connecting the laminate F in the process of manufacturing, which is to be the breakable type diaper 11, along the conveying direction of the transverse flow method, it is inexpensive and has excellent dimensional stability against tensile force. It is desirable to use a film made of polypropylene, polyester, nylon, or the like.

Next, at a predetermined position on the downstream side of the conveyance path of the third strip 28, the laminated body F swiveled 90 degrees between the adjacent connecting sheets 27 is superposed while maintaining the state before cutting. The front and rear ends of the laminated body F along the transport direction, that is, the widthwise ends of the diaper 11 to be snapped off are joined to the connecting sheet 27 (see FIG. 9). That is, when the laminated bodies F after turning 90 degrees are arranged at a predetermined interval,
It is advisable to set the width dimension W of the connection sheet 27 along the conveyance direction to an appropriate dimension so that both front and rear ends of the stack F along the conveyance direction overlap the connection sheet 27.

As described above, since the connecting sheet 27 compensates for the difference in length between the longitudinal direction and the width direction of the laminated body F after turning 90 degrees, the conveyance speed of the backsheet material 25 by the vertical flow system and It is possible to set the conveyance speed of the third strip 28 by the lateral flow method to the same speed.

Then, the third belt-like member 2 downstream of the above
At a predetermined position of the conveyance path 8, the continuous body of the pair of left and right waist elastic members 16 is joined to the continuous body of the waist sheet 26 in an extended state. Further, the widthwise outer edges of the continuous body of the waist sheet 26 are folded back inwardly so as to wrap the elastic members 16 around the waist, and they are joined to each other by overlapping the widthwise both side edges of the laminate F ( (See FIG. 10).

Then, the third strip 28 located further downstream
At a predetermined position of the transport path of the third embodiment, the central portion of the third strip 28 is arranged at a predetermined interval along with the laminated body F along the curved portions of the leg-surrounding elastic members 18 of the laminated body F that are adjacent to each other via the connecting sheet 27. And cut it out into a nearly circular shape, opening 13 around the leg
Then, a portion to be formed is formed (see FIG. 11). Then, the third strip 28 is folded in two together with the laminated body F so that the continuous body of the pair of waist sheets 26 located on both sides in the width direction of the third strip 28 overlap each other, and the side top sheet 21 is used. A portion of the backsheet material 25 that is not covered, that is, the front and rear end portions along the transport direction of the two-folded laminated body F serving as the joining flap portion 20 are joined across the width direction, and then the layers are adjacent to each other. The joining portion of the body F, that is, the portion of the connecting sheet 27 located between the portions forming the joining flap portion 20 is cut along the cutting line C ₂ in FIG. The discarded part 29 is obtained (see FIG. 12).

As described above, according to the present invention, since the laminated body F once separated can be formed into a continuous strip by the tough connecting sheet 27 having no elasticity, the waist opening 12 and the leg opening 13 are formed. It is possible to arrange the waist elastic member 16 and the leg elastic member 18 over substantially the entire circumference.

When the third strip 28 is folded in two together with the laminated body F, the third strip 28 is prevented from contracting and deforming due to the curved portion of the leg elastic member 18 so as to shrink and deform. A shape retaining plate is inserted in the central portion of 28, and thereafter, the third belt 28 is conveyed while being held by the pair of conveyor belts.

As described above, in the above-described embodiment, the third strip 28 is formed in a ladder shape with the continuous body of the pair of left and right waist sheets 26 and the connecting sheet 27 connecting them.
Of course, it is also possible to make a single strip. In this case, the same material as the waist sheet 26 is used, and it can be used as a double back sheet by overlapping the back sheet material 25 as it is.

In the above-described embodiment, the waist gathers 15 of the removable diaper 11 are formed by the elastic members 16 around the waist, but the entire flank of the removable diaper 11 is expanded and contracted in the width direction. In such a case, it is possible to further improve the overall fitting property at the time of mounting.

An embodiment of the method for manufacturing a removable diaper according to the second aspect of the present invention will be described with reference to FIGS.
This will be described in detail with reference to FIG. However, in the present embodiment, members and parts having the same functions as those of the previous embodiment shown in FIGS. 1 to 12 will be denoted by the same reference numerals, and further description will be omitted.

FIG. 13 shows the sectional structure of the crotch portion of the removable diaper of this embodiment. That is, the back sheet (hereinafter referred to as the back sheet) is the center back sheet 31 on which the liquid absorbent pad 19 is superposed.
And a pair of left and right side back sheets 32 joined to both side edges of the center back sheet 31 in the width direction, the main part is constituted, and these side back sheets 32 correspond to a pair of elastic members in the present invention. , Each of which can be expanded and contracted in the width direction.

As the side back sheet 32, a non-woven fabric made of elastomer can be adopted. In addition, polyester fibers such as polyethylene terephthalate fibers on at least one side of the elastomeric nonwoven fabric,
Polyolefin fiber, polyamide fiber such as nylon fiber, cellulose fiber such as pulp fiber and cotton fiber,
And a spunlace (hereinafter referred to as hydroentanglement) in which fibers made of a material selected from the group including these mixtures are mechanically entangled with each other by high-pressure jet water flow, or the fiber layers are laminated. It can be adopted. Furthermore, a polyurethane-based film having a thickness of 5 to 40 μm and having elasticity and elasticity, a natural rubber sheet, or a foamed sheet on at least one side of which the above-mentioned fiber layer is hydroentangled or laminated on the above-mentioned elastomer nonwoven fabric, or It is also possible to employ a non-woven fabric laminated by water entanglement and laminated.

Further, in this embodiment, the side top sheet 3 is used.
3 is also formed of a plastic material that can be stretched in its width direction. Specifically, polyester fibers such as polyethylene terephthalate fibers, polyolefin fibers, polyamide fibers such as nylon fibers, cellulose fibers such as pulp fibers and cotton fibers, and It can be obtained by hydroentangling a fibrous layer made of a material selected from the group comprising mixtures thereof. In this case, the side top sheet 33, which constitutes the surface sheet of the present invention (hereinafter referred to as a top sheet) together with the center top sheet 22, is joined to the side back sheet 32 with the leg elastic members 18 interposed therebetween. The flank portion of the removable diaper is formed, but is deformed in the width direction, that is, even plastically deformed, without inhibiting the elastic deformation of the side back sheet 32 with the widening operation of the side back sheet 32 described later. It does not need to have elasticity to return to the original state.

14 to 17 show the procedure for manufacturing the removable diaper according to this embodiment. That is, the continuous body of the center back sheet 31 corresponding to the first belt-shaped body of the present invention is continuously conveyed along the longitudinal direction (the left-right direction in FIG. 14), and the liquid is absorbed at a predetermined position of the conveying path. The sex pads 19 are intermittently superposed on the central portion in the width direction at predetermined intervals (see FIG. 14).

On the other hand, in parallel with this, a continuous body of leg elastic members 18 curved in the width direction thereof is joined to the continuous body of the pair of side back sheets 32 at a predetermined interval in an expanded state, and the leg elastic members 18 are joined together. These are joined to the widthwise both side edges of the continuous body of the center back sheet 31 so that the curved portions of the liquid absorbent pad 19 face each other across the central portion of the liquid absorbent pad 19 (see FIG. 15).

At a predetermined position in the downstream conveying path of the center back sheet 31, the pair of side top sheets 33, which are the extending members of the present invention, are connected to the side edges and the legs of the liquid absorbent pad 19. The elastic member 18 is joined to the continuous body of the center back sheet 31 and the continuous body of the side back sheet 32 so as to overlap with the curved portion of the elastic member 18 (see FIG. 16). Further, at a predetermined position of the transporting path of the continuous body of the center back sheet 31 downstream of this,
A continuous body of the center top sheet 22 having the three-dimensional gathers 23 as shown in FIG.
And the side topsheet 33 is joined to the continuous body to obtain a continuous laminated body F _C (see FIG. 17).

The continuous body of the side top sheet 33 and the continuous body of the center top sheet 22 described above form the second strip-shaped body of the present invention.

After that, at a predetermined position of the transporting path of the continuous body of the center back sheet 31 which is located further downstream than the above, it is located at an intermediate portion of the liquid absorbent pads 19 adjacent to each other along the transporting direction of the continuous laminated body F _C. Center backsheet 31 continuum, side backsheet 32 continuum, leg elastic members 18 continuum, side topsheet 33 continuum,
A continuous body of the center top sheet 22 is cut at predetermined intervals along a cutting line C ₂ shown in FIG. 18 to obtain a rectangular laminated body F having one liquid absorbent pad 19. Then, in order to prevent the laminated body F from being deformed due to the contraction of the leg elastic members 18 and the elastic members 24 due to the free opening, the conveyance surface (the surface parallel to the paper surface of FIG. 18) is maintained while maintaining the state before cutting. The laminated body F is turned by 90 degrees about an axis perpendicular to the vertical axis, and thereafter, the lateral flow system is switched. Further, the laminated body F is pulled in the width direction (left and right direction in FIG. 18) of the model diaper on which the laminated body F is detached, and the laminated body F is widened by a predetermined length by elastic deformation of the side back sheets 32 and the side top sheets 33 (FIG. 18). reference).

On the other hand, at a predetermined position of the conveyance path of the third strip 28 obtained in the same manner as in the previous embodiment shown in FIG. 9, between the adjacent connecting sheets 27, the widened layer after 90-degree turning is laminated. The bodies F are superposed on each other, and both front and rear ends of the laminate F along the transport direction are joined to the connecting sheet 27. As described above, since the laminated body F is widened in this embodiment, the width dimension W of the connecting sheet 27 along the conveyance direction can be made smaller than that in the previous embodiment, and the discarded portion can be reduced. It is possible.

Note that the work after this is basically as shown in FIG.
~ It is exactly the same as the previous embodiment shown in FIG. That is, a pair of left and right waist elastic members 16 are joined together in a stretched state on the waist sheet 26, so that the waist elastic members 16 are wrapped.
The widthwise outer edge portions of the continuous body of the waist sheet 26 are respectively folded back inward, and the widthwise both side edge portions of the laminated body F are overlapped and joined to each other. Then, along the curved portion of the leg elastic member 18 of the laminated body F adjacent to each other, the central portion of the third strip 28 is drawn out together with the laminated body F into a substantially circular shape at a predetermined interval, and the third This third strip 28 is folded in two together with the laminate F so that the continuous body of the pair of waist sheets 26 located on both sides of the strip 28 in the width direction overlaps each other, and the center back not covered by the side top sheet 33 is folded. A portion of the sheet 31, that is, the front and rear end portions along the transport direction of the laminated body F that becomes the joining flap portion 20 are joined across the width direction, and then the joined portions of the laminated bodies F adjacent to each other, That is, the joining flap portion 2
The portion of the connecting sheet 27 located between the 0 portions is cut to obtain the disposable diaper 11 and the discarding portion having the connecting sheet 27.

However, until the cutting work is completed,
Side back seat 32 and side top seat 33
From the viewpoint of workability, it is desirable to keep stretching.

[0062]

According to the method for manufacturing a snap-on type diaper of the present invention, the stretchable elastic member for squeezing the pair of openings corresponding to the thighs of both legs is conveyed along the longitudinal direction. Continuing along the substantial opening of the diaper while curving at a predetermined interval along the carrying direction with respect to the belt-shaped body, in order to join to the widthwise both sides of the first belt-shaped body by a so-called longitudinal flow method, Compared to the case of joining the elastic members by the lateral flow method, the joining can be performed efficiently and easily. In addition, since elastic members can be arranged over the entire circumference of the pair of openings corresponding to the thighs of both legs, the fitting of these openings is improved and leakage is minimized. It is possible to suppress to.

Further, the elastic member for contracting and narrowing the opening corresponding to the waist portion holds the laminated body in a state before cutting, and turns the laminated body by 90 degrees around an axis perpendicular to the conveying surface, After switching to the lateral flow system and joining to the third strip at a predetermined interval, it was made to continuously join to both widthwise side edges of this third strip, so that the opening corresponding to the waist portion A waist gather can be formed over the entire circumference, and the fit around the waist can be improved.

When the flank portion of the wearable diaper is formed of an elastic member which can expand and contract along its width direction, the wearable diaper can be made to have excellent fitability as a whole.

[Brief description of drawings]

FIG. 1 is a perspective view showing an outer appearance of a removable diaper that is an object of the present invention.

FIG. 2 is a perspective view showing an appearance of the breakable diaper shown in FIG. 1 in a state in which a joining flap portion is peeled off and developed.

FIG. 3 is a sectional view taken along the line III-III in FIG.

FIG. 4 is a work process diagram showing an example of the manufacturing method according to the first embodiment of the present invention, together with FIGS. 5 to 12, showing a state in which a liquid absorbent pad is stacked on a backsheet material.

FIG. 5 is a process step diagram showing an example of the manufacturing method according to the first embodiment of the present invention, together with FIGS. 4 and 6 to 12, and showing a state in which an elastic member around the waist is joined to a backsheet material.

FIG. 6 is a working process diagram showing an example of the manufacturing method according to the first embodiment of the present invention, together with FIGS. 4, 5 and 7 to 12, wherein the backsheet material and the liquid absorbent pad are side topsheets. Shows the state of overlapping.

FIG. 7 is a work process diagram showing an example of the manufacturing method according to the first embodiment of the present invention, together with FIGS. 4 to 6 and FIGS. 8 to 12, and showing a state in which a center top sheet is superposed on a liquid absorbent pad. Indicates.

FIG. 8 is a working process chart showing an example of the manufacturing method according to the first embodiment of the present invention, together with FIG. 4 to FIG. 7 and FIG. 9 to FIG. 12, and showing a stacking and separating process.

FIG. 9 is a work process diagram showing an example of the manufacturing method according to the first embodiment of the present invention, together with FIGS. 4 to 8 and 10 to 12, and showing a state in which a laminate is joined to a third strip. Indicates.

FIG. 10 is a work process diagram showing one embodiment of the manufacturing method according to the first embodiment of the present invention, together with FIGS. 4 to 9 and FIGS. 11 and 12, in which a waist elastic member is joined to a third strip. Shows the state.

FIG. 11 is a working process diagram showing an embodiment of the manufacturing method according to the first embodiment of the present invention, together with FIGS. 4 to 10 and FIG. Shows the removed state.

FIG. 12 is a working process diagram showing an example of the manufacturing method according to the first embodiment of the present invention, together with FIGS. 4 to 11, in which a third diaper is folded in two, and a disposable diaper and a discarding part are provided. Shows the state of being cut.

FIG. 13 is a cross-sectional view showing the structure of the crotch part of the removable diaper corresponding to the second embodiment of the present invention.

FIG. 14 is a work process diagram showing one embodiment of the manufacturing method according to the second embodiment of the present invention, together with FIGS. 15 to 18, in which a liquid absorbent pad is overlaid on the center back sheet and the legs around the center back sheet are arranged; The state before joining the side back sheet to which the elastic member was joined is shown.

FIG. 15 is a work process diagram showing one example of the manufacturing method according to the second embodiment of the present invention, together with FIG. 14 and FIGS. 16 to 18, and a liquid absorbent pad on the center back sheet and a side back sheet; The state before a top sheet is piled up is shown.

FIG. 16 is a work process diagram showing one example of the manufacturing method according to the second embodiment of the present invention, together with FIG. 14, FIG. 15, FIG. 17, and FIG. 18, before stacking the center top sheet on the side top sheet. Indicates the state of.

FIG. 17 is a work process diagram showing an example of the manufacturing method according to the second embodiment of the present invention, together with FIGS. 14 to 16 and FIG. 18, and shows a state in which a continuous laminate is formed.

FIG. 18 is a work process diagram showing an example of the manufacturing method according to the second embodiment of the present invention, together with FIGS. 14 to 17, in which the continuous laminated body is separated into individual laminated bodies and rotated by 90 degrees; Shows the state where the width is widened.

[Explanation of symbols]

11 Wearable Diaper 12 Waist Around Opening 13 Leg Around Opening 14 Back Sheet (Backsheet) 15 Waist Gather 16 Waist Elastic Member 17 Leg Gather 18 Leg Elastic Member 19 Liquid Absorbing Pad 20 Bonding Flap 21 Side Top Seat (part of second strip) 22 Center top sheet (part of second strip) 23 Three-dimensional gather 24 Elastic member 25 Back sheet material (first strip) 26 Waist sheet 27 Connecting sheet 28 No. Three strips 29 Disposal part 31 Center back sheet (first strip) 32 Side back sheet (elastic member) 33 Side top sheet (stretching member) C ₁ , C ₂ Cutting line F Laminate F _C Continuous laminate L Length of laminated body W Width of connected sheet along the conveying direction

Claims (6)

[Claims] 1. A liquid-impermeable back sheet that forms an opening corresponding to the waist and a pair of openings corresponding to the thighs of both legs, and is provided along the opening of the back sheet. And an elastic member that squeezes each of the openings, a liquid-absorbent pad provided between the pair of openings of the back sheet, and the liquid-absorbent pad and the elastic member sandwiched therebetween. A method of manufacturing a removable diaper having a liquid-permeable top sheet laminated on the back sheet, comprising: a central portion of a liquid-impermeable first strip that is continuously conveyed in the longitudinal direction. A step of arranging the liquid absorbent pad at a predetermined interval, and a pair of continuous first elastic members curved at a predetermined interval on the center side in the width direction of the first band is provided with a width of the first band. Join on both sides in the stretched state And a step of superimposing a second strip, which is continuously conveyed along the longitudinal direction and serves as the surface sheet, on the first strip through the liquid absorbent pad and the first elastic member. Bonding to obtain a continuous laminated body, cutting the continuous laminated body at predetermined intervals along the width direction to obtain a rectangular laminated body having the liquid absorbent pad, and cutting the laminated body A step of maintaining the previous shape and rotating 90 degrees about an axis perpendicular to the conveying surface; and a step of rotating the laminated body rotated 90 degrees with respect to the third belt-like body continuously conveyed in the longitudinal direction. A step of superposing and joining at a predetermined interval while maintaining the shape before cutting, and a step of joining a continuous second elastic member to both widthwise side edges of the third strip in a stretched state, The first of the adjacent stacked bodies Along the curved portion of the elastic member, a step of hollowing out the central portion of the third strip with the laminated body in a substantially circular shape at a predetermined interval, so that both side edges in the width direction of the third strip overlap. And a step of folding the third strip together with the laminate, and joining the front and rear ends of the folded double laminate along the transport direction together with the third strip in the width direction thereof. A detachable mold comprising: a step of forming a flap portion; and a step of cutting the third strip-shaped body located between the flap portions of the laminates adjacent to each other in the width direction thereof. Method of manufacturing diapers. 2. The method for manufacturing a removable diaper according to claim 1, wherein the back sheet has the first strip and the third strip. 3. A liquid-impermeable backsheet forming an opening corresponding to the waist and a pair of openings corresponding to the thighs of both legs, and provided along the opening of the backsheet. And an elastic member that squeezes each of the openings, a liquid-absorbent pad provided between the pair of openings of the back sheet, and the liquid-absorbent pad and the elastic member sandwiched therebetween. A method of manufacturing a removable diaper having a liquid-permeable top sheet laminated on the back sheet, wherein the liquid-absorbing property is provided in a central portion of a first strip that is continuously conveyed along a longitudinal direction. Arranging pads at a predetermined interval; joining a pair of continuous strip-shaped stretchable members capable of expanding and contracting in the width direction to both widthwise side edges of the first strip; Center of width of body And a step of joining a pair of continuous first elastic members that are curved at a predetermined distance to the elastic member in a stretched state, and both sides in the width direction of the continuous second strip that is conveyed along the longitudinal direction. A step of joining a pair of continuous strip-shaped stretchable members that can extend in the width direction to the edge portion, the second strip-shaped body and the stretchable member so that the elastic member and the stretchable member overlap at least partially A step in which a member is superposed on and bonded to the first strip and the elastic member via the liquid absorbent pad and the first elastic member to obtain a continuous laminated body; Cutting at a predetermined interval along with to obtain a rectangular laminated body having the liquid-absorbent pad, and maintaining the shape of the laminated body before cutting and turning 90 degrees around an axis perpendicular to the transport surface. A step of expanding the laminated body by extending a portion of the laminated body in which the elastic member and the extension member overlap each other in a width direction thereof; and a third step of being continuously conveyed along the longitudinal direction. A step in which the laminated body rotated by 90 degrees is superposed and joined to the belt-shaped body at a predetermined interval while maintaining a widened state, and a continuous second elastic member is formed on both side edges of the third belt-shaped body in the width direction. Joining in a stretched state to each other, and along the curved portion of the first elastic member of the laminated body adjacent to each other, the central portion of the third strip-shaped body together with the laminated body into a substantially circular shape at a predetermined interval. And a step of folding the third strip together with the stacked body so that both side edges in the width direction of the third strip overlap with each other, and a step of transporting the stacked body folded in two. Front and back ends along To form a flap portion together with the third strip body in the width direction of the third strip body, and in the width direction of the third strip body located between the flap portions of the laminated body adjacent to each other. A method of manufacturing a disposable diaper, which comprises a step of cutting. 4. The method for manufacturing a removable diaper according to claim 3, wherein the back sheet has the first strip, the pair of elastic members, and the third strip. 5. The method for manufacturing a snap-on diaper according to claim 3, wherein the topsheet has the second strip and the pair of elongate members. 6. The pair of left and right waist members, which form a strip shape, are arranged side by side in the width direction and are continuously conveyed in the longitudinal direction, and the third left and right ends are the waist members. It has a ladder-like structure composed of a plurality of connecting sheets joined at a predetermined interval, and the peripheral portion of the laminated body is joined to the pair of waist members and two adjacent connecting sheets. The method for manufacturing the disposable diaper according to claim 1, claim 2, claim 3, claim 4, or claim 5.