JP2001346825A - Diaper manufacturing method and device, and diaper - Google Patents

Abstract

(57) [Summary] [Problem] To provide a manufacturing method of a disposable diaper which can arbitrarily change an extension stress of an elastic member disposed around a leg of the disposable diaper without sacrificing productivity or quality. I do. SOLUTION: In a manufacturing process of a disposable diaper, elastic members 18W, 19W of the diaper are connected to a continuous body of sheets 23W, 2W.
When arranging the sheet at 7W, a continuous body of sheets 23W, 27W
Transporting the elastic members 18W, 19W in a stretched state to the sheet continuum 23W, 27W with an adhesive via a guide head in a meandering state, and the elastic members 18W, 19W Feeding the elastic members 18W and 19W in an extended state to the guide head by a pinch roll 38 that feeds out and a variable speed roll 37 disposed downstream of the pinch roll 38; and a speed of the variable speed roll 37 with respect to the pinch roll 38. Periodically changing the ratio.

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 diaper in which a stretch rate of an elastic member joined in a stretched state to a continuous body of sheets constituting a part of the diaper can be arbitrarily changed in a diaper manufacturing process. And a diaper manufactured thereby.

[0002]

2. Description of the Related Art Diapers such as pants-type disposable diapers, incontinence pants or training pants have an absorber interposed between a liquid-impermeable back sheet and a liquid-permeable top sheet. It has left and right leg openings corresponding to the thighs of both legs of the wearer. In such a diaper, a stretchable material tends to be frequently used in order to enhance the fit of the opening around the leg with respect to the thigh portion of both legs of the wearer and improve the overall feeling of wearing. Furthermore, when the diaper is worn, the leg opening is fitted to the thigh portion of the wearer, and an elastic member that can expand and contract along the leg opening between the back sheet and the top sheet to enhance the wearing feeling. Are formed to form leg gathers. Japanese Patent Application Laid-Open No. 57-77304 and Japanese Patent Application Laid-Open No.
The technique disclosed in, for example, Japanese Patent No. 17602 is well known.

[0003] Particularly, in the continuous production of disposable diapers,
A plurality of stretchable elastic materials provided along the opening around the leg meander in an S-shape on both sides in the width direction between the back sheet continuous body and the top sheet continuous body, each of which is formed in a belt shape in parallel with each other. Japanese Patent Laid-Open No. 6-19792
No. 5, JP-A-6-296644 and JP-A-7-296.
These are proposed in, for example, JP-A-255777, JP-A-7-284509, and JP-A-10-212230. In the publications disclosed in these publications, a continuous elastic member is supplied by a feed roll, and the elastic member is stretched at a required magnification in a longitudinal direction thereof by a pulling roll disposed downstream of the continuous roll. Since it is arranged by meandering in the width direction of the body, the difference between the extension stress of the elastic member in the crotch region of the diaper and that of the opening around the leg is only the difference between the extension stress generated by the traverse device.

[0004]

In the production of a conventional diaper in which an elastic member is arranged from the above-described crotch region to the opening around the leg, an absorber is usually provided in the crotch region of the diaper. Therefore, no special difference is set between the extension stress of the elastic member in the crotch region and the extension stress of the elastic member in the other part of the leg-surrounding opening.
Therefore, especially when the wearer of the diaper is exercising, the largest shear force is applied to the crotch portion in combination with the elongation stress of the elastic member interposed in the crotch region of the diaper. Adhesion of the absorber to the region was impaired, and there was a possibility that leakage occurred from both sides in the width direction of the crotch region of the diaper, regardless of the gender of the wearer.

[0005] In order to solve such a problem, it is desired to make the extension stress of the elastic member in the crotch region of the diaper smaller than that of the other portion around the leg opening. Specifically, a method has been considered in which the elastic member in the crotch region is cut so that the elongation stress by the elastic member is not applied to the crotch region. Since it is difficult to accurately adhere and fix the diaper to a predetermined portion of the leg circumference opening, there is a possibility that a product defect occurs such as insufficient tightening force at the leg gather of the manufactured diaper and the yield is reduced. there were.

It has also been considered to remove the hot melt adhesive applied along the opening around the leg of the diaper only in the crotch region, but this method can make the hot melt adhesive stable. Because there is no guarantee that the meandering curve of the elastic member actually affixed to the sheet continuum by traverse may not always match the meandering curve of the elastic member designed in advance for the sheet continuity, However, there has been a problem that diapers cannot be manufactured continuously at high speed.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an elastic member disposed in a crotch region in the diaper, in which the extension stress of the elastic member can be made smaller than that of the other portion around the leg opening. It is an object of the present invention to provide a method and apparatus for manufacturing a diaper which is improved in quality by partially changing the elongation stress of a member and which is excellent in productivity without reducing productivity thereby, and a diaper manufactured thereby. is there.

[0008]

(1) First Embodiment of the Present Invention
The form is a liquid-permeable topsheet, a liquid-impermeable backsheet, an absorber disposed between the topsheet and the backsheet, and an elastic member bonded to at least one sheet. A method for continuously producing a diaper having the following, wherein, when arranging the continuum of the elastic member on the continuum of the at least one sheet, transporting the continuum of the sheet along a longitudinal direction thereof. Applying an adhesive to the surface of the sheet continuum being conveyed, and disposed near the surface of the sheet continuum on the downstream side in the conveyance direction of the sheet continuum from the application position of the adhesive. Defining the position of the elastic member continuum bonded to the sheet continuum via the adhesive by the guide head, and supplying the continuum of the elastic member to the guide head. Joining the continuum of the elastic member to the sheet continuum with the adhesive via the guide head; and supplying the continuum of the elastic member to the guide head. And periodically changing the elongation rate of the continuum of the elastic member supplied to the elastic member.

In this case, an elastic member may be arranged between the top sheet and the back sheet, or an exterior member defined below may be further provided and arranged between the exterior member. Includes That is, the position of the elastic member is not specified here, and the elastic member only needs to be joined to at least one sheet constituting a part of the diaper.

(2) In the diaper manufacturing method according to the first aspect of the present invention, the step of defining the position of the continuum of the elastic member adhered to the sheet continuum includes the step of moving the guide head in the conveying direction of the sheet continuity. Reciprocating in the direction intersecting with each other, and joining the continuum of the elastic member to the sheet continuum, joining the continuum of the elastic member to the sheet continuum in a meandering state, and connecting the elastic member to the guide head. The step of supplying the body includes supplying the continuum of the elastic member in an extended state by a pinch roll that feeds out the continuum of the elastic member and a variable speed roll disposed downstream of the pinch roll. It is a preferable embodiment that the step of periodically changing the speed is to periodically change the speed ratio between the pinch roll and the variable speed roll.

(3) The diaper according to the first aspect,
A liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body having an absorber disposed between the top sheet and the back sheet; and An exterior member that covers the waist and holds the absorbent main body against the wearer, and an elastic member disposed along the leg opening is disposed between the sheets constituting the exterior member. In a manufacturing process, it is a preferred embodiment to dispose the elastic members of the leg-surrounding openings by the above-described method.

(4) In this case, the elastic member is composed of a first elastic member and a second elastic member which are opposed to each other in a substantially U-shape across the diaper in the width direction of the diaper, and the first elastic member is a diaper. The second elastic member is disposed at the center of the crotch region from both side edges of the diaper at the front body side, and the second elastic member is disposed at the center of the crotch region from both side edges of the rear body side of the diaper. Two guide heads are provided, and it is preferable that the guide heads reciprocate and arrange the continuum of the first and second elastic members between the central portion of the sheet continuum and each side end thereof. This is one embodiment.

(5) Further, in this case, the elongation stress of the first and second elastic members is weakest at a portion arranged at the center of the crotch region of the diaper and is strongest at portions arranged at both side edges of the diaper. The rotation speed of the variable speed roll is periodically changed so that the elongation ratio of the continuum of the first and second elastic members is adjusted such that the first and second guide heads are positioned at the center of the continuous sheet. In this case, it is preferable to set the value to be the smallest, and to set the value to be the largest when the sheet is located on the side end side of the continuous sheet.

(6) Further, one rotation of the variable speed roll is performed by one rotation.
It is a preferable embodiment that the rotation speed is regularly changed as a cycle.

(7) According to a second aspect of the present invention, there is provided an apparatus for continuously manufacturing a diaper having an elastic member, wherein the elastic member is connected to a continuous body of at least one sheet constituting a part of the diaper. As means for arranging the body, a sheet continuity conveying means for conveying the continuous body of sheets along the longitudinal direction thereof, an adhesive applying means for applying an adhesive to the surface of the sheet continuity being conveyed, The elasticity, which is disposed close to the surface of the sheet continuum on the downstream side in the conveyance direction of the sheet continuity from the position where the adhesive is applied by the adhesive application unit and is adhered to the sheet continuity via an adhesive A guide head for defining the position of the continuum of members, elastic member supply means for supplying the continuum of the elastic member toward the guide head, In apparatus for manufacturing a diaper, wherein a continuum of elongation of the elastic member is supplied to the de-equipped and elongation changing means for periodically changing.

(8) In the diaper manufacturing apparatus according to the second aspect of the present invention, the elastic member supply means holds the continuum of the elastic member and feeds the continuum of the elastic member at a predetermined speed. And a pair of variable speed rolls for holding a continuum of the elastic member between the pair of pinch rolls and the guide head. It is a preferable embodiment to have a mechanism for periodically changing.

(9) Further, the apparatus further comprises a guide head driving means for reciprocating the guide head in a direction intersecting the conveying direction of the sheet continuum, wherein the extension rate variable means is provided for the guide head with respect to the sheet continuity. It is a preferable embodiment to change the elongation rate of the continuous body of the elastic member in conjunction with the reciprocating position.

(10) Further, one reciprocating operation of the guide head corresponds to one rotation operation of the pair of variable speed rolls, and one rotation of the pair of variable speed rolls is one cycle, and the rotation speed is regularly set. It is a preferable aspect to change the speed.

(11) It is a preferred embodiment that the expansion rate variable means has a rotary slider crank mechanism (rotary sliding crank mechanism).

(12) The guide heads include a first guide head and a second guide head which are respectively disposed on one side end and the other side end of the continuous sheet body with respect to the center. It is a preferred embodiment that the first and second guide heads reciprocate between the central portion of the sheet continuum and each side end thereof.

(13) In this case, the elastic member is arranged along the opening around the leg of the diaper, and the elongation ratio varying means determines the elongation ratio of the continuous body of the elastic member, and the first and second guide heads control the seat. It is possible to change so that it is smallest when it is located near one reciprocating end on the center portion side of the continuum, and is largest when it is located near the other reciprocating end on the side end side of the continuous sheet. This is a preferred embodiment.

(14) A third aspect of the present invention is a diaper manufactured by the above method or apparatus.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment in which the present invention is applied to a pants-type disposable diaper will be described in detail with reference to FIGS. 1 to 8, but the present invention is not limited to such an embodiment. , Can be further combined or applied to other techniques that are to be encompassed by the inventive concepts described in the claims herein.

FIG. 1 shows the appearance of the pants-type disposable diaper to which the present invention is applied, and FIG. That is, the pants-type disposable diaper 11 according to the present embodiment includes a waist opening 12 corresponding to the waist, a pair of left and right leg openings 13L and 13R corresponding to the thighs of both legs, and these openings. 12,
An exterior member 14 that forms 13L and 13R, an elastic member 16 around the waist to form a waist gather 15 by squeezing the waist opening 12 and a leg gather 17 by squeezing the leg openings 13L and 13R The first elastic member 18 and the second elastic member 19 for performing the operation and the absorptivity extending from the crotch 14G of the exterior member 14 between the left and right leg openings 13L and 13R to the abdominal part 14F and the back part 14B, respectively. And a main body 20.

Further, a pair of right and left closing portions 21L communicating with the waist opening 12 and the leg openings 13L and 13R are provided on both left and right side edges of the abdomen 14F and the back 14B of the exterior member 14. , 21R are formed to be peelable, and by peeling off these closing portions 21L, 21R, they can be developed as shown in FIG. That is, the front and rear closing portions 21L and 21R of the exterior member 14 are overlapped with each other from the unfolded state shown in FIG. 2, and these contact portions are joined by hot melt bonding, pressure fusion bonding, or ultrasonic fusion bonding. Pants-type disposable diapers 11 shown in FIG. 1 can be obtained by joining these methods alone or in appropriate combinations.

In FIG. 2, the absorbent main body 20 comprises a liquid-permeable top sheet 24 and a liquid-impermeable back sheet 2.
6 and an absorber 22 disposed therebetween, and the backsheet 26 side of the absorbent main body 20 is
And a pants-type disposable diaper 11 is formed.

The exterior member 14 includes a cover sheet 27.
And the inner cover sheet 23 are adhered to each other, and elastic members 18 and 19 are held between the sheets 27 and 23 in an extended state. The first elastic member 18 traverses the crotch portion 14G from the closing portion 21R located on the right edge of the abdominal portion 14F of the exterior member along the right leg opening 13R on the abdominal portion 14F, 14
It is arranged so as to reach the closing portion 21L located at the left edge of the abdominal portion 14F along the opening 13L around the left leg of F. Further, the second elastic member 20 is moved from the closing portion 21R located on the right edge of the back side portion 14B to the right side of the back side portion 14B so that the first elastic member 18 and the crotch portion 14G come close to each other. It is arranged so as to cross the crotch portion 14G along the leg opening 13R and to reach the closing portion 21L located on the left edge of the back portion 14B along the leg opening 13L on the left side of the back portion 14B. ing. The plurality of elastic materials constituting the first and second elastic members 18 and 19 are arranged at substantially equal intervals in parallel with each other.

The waist-surrounding elastic members 16 are arranged in an extended state at both ends in the longitudinal direction of the exterior member 14 to form an opening 12 around the waist.

When manufacturing such a pants-type disposable diaper 11, as shown in FIG. 3, a first elastic member and a second elastic member are provided between a continuous body 27W of a cover sheet and a continuous body 23W of an inner cover sheet. Continuum bodies 18W and 19W are continuously attached in a stretched state so as to draw a sine curve shape,
The continuum 27W and 23W of these sheets are bonded to form a continuum 14W of the exterior member, and the absorbent body 20 conveyed by the conveyor 53 is superimposed thereon, and these are joined and used to use a diaper. Continuum of 11W
To form Then, as shown in FIG. 7, the portion surrounded by the continuum 18W, 19W of the first and second elastic members, which becomes the opening around the leg, is hollowed out substantially in an ellipse (in FIG. 7, reference numeral 25 in FIG. 7).
), The continuum 14W of the exterior member is folded in two at the center along the longitudinal direction, and the continuum 14W
A pair of waist elastic members 16W located on both side edges of the continuum are superimposed on each other to form a closing portion 21L,
21R is formed, and the central portions of the closed portions 21L and 21R are cut to produce the pants-type disposable diaper 11.

FIG. 3 shows an example of a disposable diaper manufacturing apparatus for producing such a pants-type disposable diaper.
FIG. 4 shows a cross-sectional structure of the rotary slider crank mechanism, FIG. 5 shows a cross-sectional structure taken along line VV, and FIG. 6 schematically shows a drive mechanism of the guide head. That is, the payout shaft 3 on which the take-up 27C of the cover sheet is rotatably mounted.
1 and the feeding shaft 32 to which the inner cover sheet take-up 23C is detachably attached, for overlapping the strip-shaped cover sheet continuum 27W and the inner cover sheet continuum 23W with each other. A pair of collecting rolls 33 is provided, and these two feeding shafts 3 are provided.
The cover sheet winding 27C and the inner cover sheet winding 2
Continuum 2 of cover sheet drawn from 3C
A cover sheet conveying means 34 and an inner cover sheet conveying means 35 each composed of a large number of roll groups for guiding the 7 W and the continuous body 23W of the inner cover sheet to the pair of collecting rolls 33 are provided. Cover sheet conveying means 34 and inner cover sheet conveying means 3
The hot melt adhesive is applied to predetermined areas of the continuous body 27W of the cover sheet and the continuous body 23W of the inner cover sheet in the middle of the respective transport paths of the continuous body 27W of the cover sheet and the continuous body 23W of the inner cover sheet according to No. 5. Spray guns 36 are provided.

Below the pair of collecting rolls 33, a continuum of elastic members 1 respectively unwound from winding (not shown)
The two sets of left and right variable speed rolls 37 that guide 8W and 19W between the cover sheet continuum 27W and the inner cover sheet continuum 23W are formed by the cover sheet continuum 27W.
And two sets of right and left elastic members continuum 18W and 19W are provided at the upstream side at a constant speed corresponding to the transport speed of the cover sheet continuum 27W and the inner cover sheet continuum 23W. A pair of pinch rolls 38 for sending out to the variable speed roll 37 side are provided. Left and right 2
A set of variable speed rolls 37 is provided with a rotating slider crank mechanism (rotating slide crank mechanism) 39 as shown in FIG. 4, and an input shaft 41 driven and rotated by power from a drive source (not shown), The output shaft 40 connected to the speed change roll 37 is set in an eccentric state, and a plate cam 44 in which a pin 43 of a turner 42 provided on the output shaft 40 is slidably engaged is mounted on the input shaft 41 side. By periodically changing the angular velocity of the output shaft 40 with respect to the input shaft 41 rotating in one rotation during one rotation, the continuum 18 of the elastic member interposed between the collecting roll 33 and the variable speed roll 37 is formed.
It is possible to change the elongation rate of W and 19W. This elongation rate can be arbitrarily changed according to the amount of eccentricity between the input shaft 41 and the output shaft 40 and the distance from the center of the output shaft 40 to the pin 43 of the turn 42. It is changed in conjunction with the reciprocation of the head.

A pair of left and right head slider guides 45 arranged along the longitudinal direction of the collecting roll 33 is provided between the two sets of left and right variable speed rolls 37 and a pair of collecting rolls 33.
A pair of left and right head sliders 46 slidably held along these head slider guides 45 in a direction intersecting the transport direction of the continuous body 27W of the cover sheet and the continuous body 23W of the inner cover sheet; And a pair of left and right guide heads 47 for regulating the position of the continuum 18W, 19W of the elastic member. Each of the guide heads 47 has a three-comb shape in accordance with the number of the continuous members 18W and 19W of the elastic member, and the continuous members 18W and 19W of the elastic member can pass between the individual comb teeth. It has become.
On the sides of the left and right head slider guides 45, a cylindrical cam 48 that is driven and rotated at a predetermined speed in synchronization with a pressure roll described later, and another end of a connecting rod 49 having one end fixed to the head slider 46 are provided. The head slider 46 is fixed and engaged with the cylindrical cam 48 to move the head slider 46 to the head slider guide 45.
And a cam follower 50 for reciprocating left and right along. The distal end of the guide head 47 is located immediately below the pair of collecting rolls 33 in a state of being adjacent thereto, and is formed of an elastic member sandwiched between the cover sheet continuous body 27W and the inner cover sheet continuous body 23W by the guide head 47. Care is taken to minimize the displacement of the continuum 18W, 19W.

The reciprocating operation of the guide head 47 corresponds to the size of each pants-type disposable diaper 11 with respect to the continuous body 27W of the cover sheet and the continuous body 23W of the inner cover sheet. Joined between the cover sheet continuum 27W and the inner cover sheet continuum 23W so as to draw two symmetrical sine-shaped curves centered on the widthwise center of the inner cover sheet continuum 23W. Is done. Also, a pair of left and right guide heads 47 is a cover sheet continuum 27W.
At the inner side in the width direction of the continuous body 23W of the inner cover sheet, that is, at the position where the pair of left and right guide heads 47 approach each other, the continuous body 27W of the cover sheet and the continuous body of the inner cover sheet are in a state where the elongation rate is minimized. 23W and a pair of left and right guide heads 47.
At the both ends in the width direction of the continuum 27W of the cover sheet and the continuum 23W of the inner cover sheet, that is, at the position where the pair of left and right guide heads 47 are farthest apart from each other, the continuity of the cover sheet is maximized. 27
W and the continuous body 23W of the inner cover sheet.

It is also possible to displace the pair of left and right guide heads 47 on the upstream and downstream sides along the transport direction of the continuous body 27W of the cover sheet and the continuous body 23W of the inner cover sheet. In this case, the continuities 18W and 19W of the elastic members may be arranged so as to intersect or overlap at the center in the width direction of the continuum 27W of the cover sheet and the continuity 23W of the inner cover sheet.

The winding rolls 27C and 23C and the collecting roll 33
Spray guns 36 are respectively arranged in the middle of the transport path of the continuous body 27W of the cover sheet and the continuous body 23W of the inner cover sheet between them.
6, hot melt adhesive is applied to the continuum 27W of the cover sheet and the continuum 23W of the inner cover sheet.
It is supplied during 3W. On the downstream side of the collecting roll 33,
A pressure roll 51 and a press roll 52 that is in contact with the pressure roll 51 are disposed, and a cover sheet continuum 27W
In order to ensure the adhesion between the continuous body 23W of the inner cover sheet and the continuous bodies 18W and 19W of the elastic member,
These are pressed between the pressure roll 51 and the press roll 52 to form a continuum 14W of an exterior member having continuities 18W and 19W of elastic members interposed therebetween. The absorbent body 20 manufactured by previously sandwiching an absorber (not shown) is introduced into the press roll 52 at a predetermined interval by a conveyor 53, and the outer body of the exterior member is passed through a vacuum roll 54 that conveys the absorbent body while sucking the absorbent body. The absorbent body 20 is superimposed on the continuum 14W via an adhesive. This adhesive is applied to the surface of the inner cover sheet 23W constituting the continuous body 14W of the exterior member from the spray gun 55 facing the outer peripheral surface of the press roll 52 between the pressure roll 51 and the vacuum roll 54. .

A continuous 11 W disposable diaper in the process of manufacturing the pants-type disposable diaper 11 using such an apparatus.
Is conceptually shown in FIG. That is, the continuum 1 of the exterior member
At 4W, the continuum 16W of the elastic member around the waist and the continuum 18W, 19W of the first and second elastic members are arranged in an extended state, respectively. Continuum 18 of first and second elastic members
W and 19W are respectively joined to the continuum 14W of the exterior member in a meandering state approximating a sine curve. Then, the absorbent body 20 is superimposed on and integrated with the continuous body 14W of the exterior member, whereby the continuous body 11W of the used diaper is obtained.

In the absorbent body 20, the absorber 22 is placed on the continuum of the backsheet at a predetermined interval, and the continuum of the topsheet is further superimposed and integrated thereon, and is then reduced to a predetermined size. Obtained by cutting.

The continuum 11W of the disposable diaper obtained as described above is compared with the continuum 1 of the first and second elastic members.
A portion surrounded by 8W and 19W is cut out in an almost elliptical shape to form a cutout portion 25. Then, the continuous diaper 11W used is folded in half at the center along the longitudinal direction so that the absorbent main body 20 is on the inner side, and located at both side edges of the continuous diaper 11W. A pair of waist-around elastic members continuum 16W overlap each other,
The central portion of the hollow portion 25 is connected to the cover sheet continuum 27.
The closing portions 21L, 21L cross the width direction of W.
The adhesive fixing portion is formed at a predetermined interval by the adhesive applied to the R, and a continuous body of bent pants-type disposable diapers is obtained. The diaper 11 is obtained.

FIG. 8 shows the distribution of the elongation rates of the elastic members 18 and 19 provided along the leg openings 13R and 13L of the pants-type disposable diaper 11 manufactured using the above-described apparatus.
Shown in A curve drawn by a solid line corresponds to the present embodiment, and a broken line is an example of a conventional one. As is clear from this graph, in the pants-type disposable diaper 11 according to the present invention, since the elongation rate of the elastic members 18 and 19 in the central region of the crotch is lower than that of the conventional one, the crotch region of the wearer. , The adhesion of the absorber 22 can be kept better than the conventional one. The left and right leg openings 13
Since the elongation rates of the elastic members 18 and 19 in R and 13L are larger than those in the related art, it is possible to further reduce problems such as slippage of the pants-type disposable diaper 11 caused by movement of the legs of the wearer. Can be.

As described above, according to the present invention, the difference in extension magnification between the crotch central region of the leg-surrounding elastic member and the leg-surrounding portion can be made larger than that of the conventional product. The adjustment of the extension ratio of the elastic member around the leg is performed only by moving the guide head in the direction perpendicular to the sheet continuum. However, in the present invention, not only the movement of the guide head but also This is for changing the extension ratio of the elastic member in the step.

In the above-described embodiment, the rotary slider crank mechanism (rotary sliding crank mechanism) is employed as the elongation rate changing means for changing the rotation speed of the variable speed roll in the elastic member supply means. It is also possible to employ a well-known speed change mechanism or the like that changes the rotation speed electrically.

Further, in this embodiment, the elastic member is arranged on the continuous body of the sheet while meandering by the guide head. However, in the present invention, the elastic member is not meandered by the guide head, and It is also possible to arrange while changing only the elongation rate periodically. Such a technique is used when the elongation rate of the elastic member around the waist is changed while changing according to the diaper arrangement site. Can be adopted.

In the above-described embodiment, the elastic members 18, 19
Is disposed between the cover sheet 27 and the inner cover sheet 23 constituting the exterior member 14, but the liquid-impermeable back sheet 26 and the liquid-permeable top sheet 24 also have the function of the exterior member, By disposing the elastic members 18 and 19 together with the absorber 22 between the sheet and the back sheet, the exterior member 14 can be omitted.

[0044]

According to the method for manufacturing a disposable diaper of the present invention, the elongation rate of the elastic member disposed on the surface of the sheet via the guide head is arbitrarily changed according to the disposition portion of the disposable diaper. As a result, it is possible to achieve the required elongation rate of the elastic member in each part of the diaper, thereby improving the quality of the diaper, such as leakage and fit. it can.

Further, as in the case where the elastic members around the legs of the diaper are disposed, the guide head is reciprocated in a direction perpendicular to the advancing direction of the continuous body of the sheet continuously fed out in the manufacturing process. In the method of arranging the elastic member while meandering, in the conventional manufacturing method, the extension rate changes according to the position of the guide head when the guide head is reciprocated. Since the amount of change in the elongation rate is limited by the amount of displacement, the elongation rate could not be changed sufficiently. By adding the method of the present invention to the conventional method, it is possible to further promote the change in the elongation rate in the conventional method, and conversely, it is also possible to cancel the change in the elongation rate due to the movement of the guide head.

Further, in the conventional method, the extension rate of the elastic member could not be changed when the guide head was not reciprocated, but in the present invention, the elastic member was not meandered by the guide head, and the elastic member was not extended. It is also possible to arrange while changing only the rate periodically, such a technique is used when placing while changing according to the location of the diaper using the elongation rate of the elastic member around the waist The present invention can be applied, and can contribute to a wide range of quality improvement related to the elastic member of the disposable diaper.

More specifically, the elongation rate of the continuity of the elastic member supplied to the sheet surface via the guide head is changed by interlocking with the reciprocating position of the guide head relative to the sheet surface. It is possible to arbitrarily change the elongation stress of the elastic member disposed along the leg circumference opening without reducing the productivity of the diaper, and as a result, the leg circumference opening and the inseam area of the diaper can be used. It is easy to take measures such as reducing the elongation rate of the elastic members arranged continuously along the leg in the crotch area, and at the same time keeping the closeness of the opening around the leg to the wearer and preventing leakage from the crotch part A disposable diaper that can be minimized can be manufactured.

Guide heads are respectively positioned at one side end and the other side end of the continuous sheet body in the manufacturing process at the center, and these guide heads are respectively positioned at the center of the sheet and each side. By reciprocating between the end portions, the diapers using the elastic members around the legs can be separately arranged on the front side and the back side of the diaper, and the respective elongation rates can be changed depending on each part.

When the guide head is located near one reciprocating end of the central portion of the sheet continuum, the extension rate of the elastic member continuum is the smallest, and the other reciprocating end near the side end of the sheet is near. When the elongation rate of the continuum of the elastic member is set to be the largest when it is located at the position of the elastic diaper, the elastic member is disposed along the leg opening and the crotch region of the diaper, thereby using the diaper. Since the elongation rate of the continuous body of the elastic member in the crotch region is smaller than that of the other portion around the leg opening, the adhesiveness of the absorber to the crotch region of the wearer can be improved. In addition, it is possible to manufacture a disposable diaper in which the feeling of pressure of the leg gathers formed in the opening around the leg is small and the movement around the leg of the wearer is not hindered.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating an appearance of a disposable diaper to which the present invention is applied.

FIG. 2 is a development view of the disposable diaper shown in FIG.

FIG. 3 is a conceptual diagram showing a main part of an example of a manufacturing apparatus for a disposable diaper capable of implementing the method of the present invention.

FIG. 4 is a cross-sectional view of the rotary slider crank mechanism in the apparatus for manufacturing disposable diapers shown in FIG.

FIG. 5 is a sectional view taken along the line VV in FIG. 4;

6 is a perspective view schematically showing a guide head driving mechanism in the used diaper manufacturing apparatus shown in FIG.

FIG. 7 is a conceptual diagram illustrating a manufacturing process of the disposable diaper manufacturing apparatus illustrated in FIG.

8 is a graph showing a relationship between a position of an elastic member along a sheet conveying direction shown in FIG. 7 and an elongation rate thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Pants type disposable diaper 11W Continuum of disposable diapers 12 Waist opening 13L, 13R Leg opening 14 Exterior member 14G Crotch portion of exterior member 14F Abdominal side of exterior member 14B Back side of exterior member 14W Continuum of exterior member 15 Waist gather 16 Elastic member around waist 16W Continuum of elastic member around waist 17 Leg gather 18 First elastic member 18W Continuum of first elastic member 19 Second elastic member 19W Continuum of second elastic member DESCRIPTION OF SYMBOLS 20 Absorbent main body 21L, 21R Closed part 22 Absorber 23 Inner cover sheet 23C Winding of inner cover sheet 23W Continuous body of inner cover sheet 24 Top sheet 25 Cutout part 26 Back sheet 27 Cover sheet 27W Continuous body of cover sheet 27C Cover sheet Take-out 31, 32 Feeding shaft 33 Collecting roll 34 Cover sheet transport means 35 Inner cover sheet transport means 36 Spray gun 37 Variable speed roll 38 Pinch roll 39 Rotary slider crank mechanism 40 Output shaft 41 Input shaft 42 Trigger 43 Pin 44 Plate cam 45 Head slider guide 46 Head slider 47 Guide head 48 Cylindrical cam 49 Connecting rod 50 Cam follower 51 Pressure roll 52 Press roll 53 Conveyor 54 Vacuum roll 55 Spray gun

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takeo Maeda 1 Oji-cho, Kasugai-shi, Aichi Prefecture Inside Oji Paper Co., Ltd. (72) Inventor Tokisa Sato 1-Oji-cho, Kasugai-shi, Aichi Oji Kogyo Co., Ltd. Nagoya Division F-term (reference) 3B029 BF02 4C098 AA09 CC12 CC27 CE05

Claims (14)

[Claims] 1. A liquid-permeable top sheet, a liquid-impermeable back sheet, an absorber disposed between the top sheet and the back sheet, and an elastic member joined to at least one sheet. And a method for continuously manufacturing a diaper having the following. When arranging the continuum of the elastic member on the continuum of the at least one sheet, the continuity of the sheet is conveyed along a longitudinal direction thereof. Applying an adhesive to the surface of the continuous sheet during conveyance; and disposing the adhesive close to the surface of the continuous sheet on the downstream side in the transport direction of the continuous sheet from an application position of the adhesive. Defining the position of the continuum of the elastic member adhered to the sheet continuum via an adhesive by the guided guide, and supplying the continuum of the elastic member to the guide head Joining the continuum of the elastic member to the sheet continuum with the adhesive via the guide head; and supplying the continuum of the elastic member to the guide head. Periodically changing the elongation rate of the continuum of the elastic member supplied to the diaper. 2. In the step of defining the position of the continuum of the elastic member adhered to the sheet continuum, the guide head is reciprocated in a direction intersecting the conveying direction of the sheet continuity, In the step of joining the continuous body of the elastic member to the continuous sheet, the continuous body of the elastic member is joined to the continuous sheet in a meandering state, and the continuous body of the elastic member is supplied to the guide head. The step of supplying the continuous body of the elastic member in an extended state by a pinch roll that feeds out the continuous body of the elastic member and a variable speed roll disposed downstream thereof, and the elongation rate of the continuous body of the elastic member. 2. The step of periodically changing the speed ratio comprises periodically changing a speed ratio between the pinch roll and the variable speed roll.
The method for producing a diaper according to the above. 3. The diaper according to claim 1, wherein the diaper comprises a liquid-permeable topsheet, a liquid-impermeable backsheet, an absorbent body having an absorber disposed between the topsheet and the backsheet. An absorbent member to which the absorbent main body is joined and covers the waist around the wearer and holds the absorbent main body against the wearer, and an elastic member arranged along the leg-around opening defines the exterior member. The diaper manufacturing method according to claim 1 or 2, wherein the elastic member at the opening around the leg is arranged by the method in a manufacturing process. 4. The elastic member comprises a first elastic member and a second elastic member which are opposed to each other in a substantially U-shape across the diaper in a width direction of the diaper, and the first elastic member is a predecessor of the diaper. It is located at the center of the crotch area from both sides of the side,
The second elastic member is disposed at the center of the crotch region from both side edges on the rear body side of the diaper, and a first guide head and a second guide head are provided as the guide head. First
The diaper manufacturing method according to claim 3, wherein the continuum of the second elastic member and the continuum of the second elastic member are reciprocated and arranged between a center portion and each side end of the continuation sheet. 5. The method according to claim 1, wherein the first and second elastic members have the lowest elongation stress at a portion arranged at the center of the crotch region of the diaper and the strongest at portions arranged at both side edges of the diaper. The rotation speed of the variable speed roll is periodically changed, and the elongation rate of the continuum of the first and second elastic members is adjusted such that the first and second guide heads are located at the center of the sheet continuum. The diaper manufacturing method according to claim 4, wherein the smallest value is set in the case, and the largest value is set in the case of being located on the side end side of the continuous sheet body. 6. The diaper manufacturing method according to claim 1, wherein one rotation of the variable speed roll is one cycle, and the rotation speed is regularly changed. 7. An apparatus for continuously manufacturing a diaper having an elastic member, wherein the means for arranging the continuum of the elastic member on a continuum of at least one sheet constituting a part of the diaper includes: Sheet continuity conveying means for conveying the continuum along its longitudinal direction; adhesive application means for applying an adhesive to the surface of the sheet continuity being conveyed; and an adhesive application position by the adhesive application means For defining the position of the continuum of the elastic member, which is disposed closer to the surface of the sheet continuum than the sheet continuity in the direction of conveyance of the sheet continuum and is adhered to the sheet continuity via an adhesive. A guide head; an elastic member supply means for supplying a continuum of the elastic member toward the guide head; and the elastic portion incorporated in the elastic member supply means and supplying to the guide head The continuum of diaper manufacturing apparatus characterized by the elongation rate that comprises a stretch ratio varying unit of periodically changing. 8. The elastic member supply means includes: a pair of pinch rolls for nipping the continuum of the elastic member and feeding out the continuum of the elastic member at a predetermined speed; and a pair of the pinch rolls and the guide head. And a pair of variable speed rolls for holding the continuum of the elastic member therebetween, wherein the elongation rate variable means periodically changes the speed ratio of the variable speed rolls to the pair of pinch rolls. The diaper manufacturing apparatus according to claim 7, comprising: 9. A guide head driving means for reciprocating the guide head in a direction intersecting a conveying direction of the sheet continuum, wherein the elongation ratio variable means guides the sheet continuity to the sheet continuity. 9. The diaper manufacturing apparatus according to claim 7, wherein an extension rate of the continuous body of the elastic member is changed in conjunction with a reciprocating position of the head. 10. One reciprocating operation of the guide head corresponds to one rotation of the pair of variable speed rolls, and one rotation of the pair of variable speed rolls is one cycle, and the rotation speed is regularly set. The diaper manufacturing apparatus according to any one of claims 7 to 9, wherein a speed is changed. 11. The diaper manufacturing apparatus according to claim 7, wherein said elongation rate varying means has a rotary slider crank mechanism. 12. The first guide head and the second guide head, which are respectively disposed on one side end and the other side end of the continuous sheet body with respect to a center portion of the continuous sheet body. The first and second guide heads reciprocate between a central portion of the sheet continuum and each side end thereof, respectively. A diaper manufacturing apparatus as described. 13. The first and second elastic members are arranged along an opening around the leg of the diaper, and the elongation ratio variable means adjusts an elongation ratio of a continuous body of the first and second elastic members. It is the smallest when the first and second guide heads are located near one reciprocating end on the central portion side of the sheet continuous body, and is located near the other reciprocating end on the side end side of the sheet continuous body. 13. The diaper manufacturing apparatus according to claim 12, wherein the diaper manufacturing apparatus is changed so as to maximize the diaper. 14. A diaper manufactured by the method according to any one of claims 1 to 6 or the apparatus according to any one of claims 7 to 13.