JP2006314361A - Disposable diaper and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disposable diaper for which an adhesive type fastening tape has sufficient power of holding adhesion with a diaper main body even in the case that a nonwoven fabric is stuck to a diaper main body skin non-abutting surface or in the case of using a soft nonwoven fabric for the main body skin non-abutting surface or skin abutting surface, and its manufacturing method. <P>SOLUTION: For the disposable diaper 1, the fastening tape 5 is provided on each of both side edge parts 12 in the diaper main body 10. The tape base material 51 of the tape 5 of the diaper 1 is folded so as to be from the skin non-abutting surface side to the skin abutting surface side of the diaper main body 10, and the part 54 positioned on the skin abutting surface side of the diaper main body 10 of the tape base material 51 is freely detachably adhered and fixed on a release tape 6. The part 55 positioned on the skin non-abutting surface side of the diaper main body 10 of the tape base material 51 is fused and fixed to the skin non-abutting surface side of the diaper main body 10 by ultrasonic sealing work from the skin non-abutting surface side. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a disposable diaper, in particular, a disposable diaper having an adhesive fastening tape.

Conventionally, disposable diapers having an adhesive fastening tape are widely known. This type of adhesive fastening tape is adhesively fixed to the non-skin contact surface side of both side edges on the back side of the diaper body, and when the diaper is removed from the product packaging bag, the back side of the diaper body It is detachably bonded to a release tape arranged on the skin contact surface side of the part. The fastening tape is peeled off from the release tape when the diaper is worn, and adhered to the landing zone on the diaper belly side.
When the diaper is worn, a tensile force acts on the fastening tape that passes between the abdomen and the back of the diaper body. The adhesive fastening tape is bonded and fixed to the diaper main body only by the adhesive holding force of the adhesive surface on the non-skin contact surface side of the diaper main body.

In the conventional diaper in which the non-skin contact surface of the diaper body is formed of a film sheet, a sufficient adhesive holding force is obtained between the diaper body and the adhesive type fastening tape, and there is no practical problem.
However, the non-skin contact surface of the mainstream diaper body in recent years, in which a non-woven fabric is further bonded to the outer surface of the film forming the non-skin contact surface of the diaper body, In some cases, sufficient adhesive holding force cannot be secured.

  In Japanese Patent Publication No. 52-34978 (Patent Document 1), a part of the adhesive surfaces of the adhesive-type fastening tape and the release tape are bonded to each other to form a so-called Y configuration. Disposable diapers with improved adhesion retention between the diaper body and the fastening tape are disclosed by being bonded to the non-skin contact surface and also bonded to the skin contact surface side of the diaper body via a release tape. Yes.

Japanese Patent Publication No. 52-34978

Even in the disposable diaper having the above configuration, when a soft non-woven fabric such as air-through is used on the non-skin contact surface side or the skin contact surface side of the diaper body for the purpose of improving the texture of the diaper, the adhesive type fastening tape is In some cases, sufficient adhesion holding force cannot be secured to the diaper main body.
In addition, since the adhesive fastening tape has the Y configuration, a part of the bonding surface of the fastening tape with the abdomen side of the diaper main body is used for bonding with the release tape. There is a risk that the adhesion holding force with the part will be reduced.

  Furthermore, in the said Y structure, in the process which adhere | attaches the tape composite body which consists of a fastening tape and a release tape to a diaper main body, a high processing precision is calculated | required. When the tape composite is bonded with a deviation from a predetermined position of the diaper body, when the fastening tape is peeled off from the release tape and opened, a projection is formed in which a part of the fastening tape or the release tape is bonded to each other. This is because the protrusion may damage the wearer's skin. The formation of the protrusions can be prevented by increasing the processing accuracy, but there is a problem that productivity is lowered.

  Therefore, the object of the present invention is to use a soft nonwoven fabric on the non-skin contact surface side or the skin contact surface side of the diaper body when the nonwoven fabric is bonded to the non-skin contact surface side of the diaper body. Even in such a case, the adhesive fastening tape provides a disposable diaper having a sufficient adhesive holding force with the diaper main body and a method for manufacturing the disposable diaper.

  The present invention is a disposable diaper in which a fastening tape is provided on each side edge of the diaper body, wherein the tape base material of the fastening tape is from the non-skin contact surface side to the skin contact surface side of the diaper body. The portion of the tape base material located on the skin contact surface side of the diaper main body is detachable on a release tape fixed to the skin contact surface side of the diaper main body. The portion of the tape base material that is located on the non-skin contact surface side of the diaper main body is fused to the non-skin contact surface side of the diaper main body, so that the non-skin contact surface side of the diaper main body is The above-mentioned object is achieved by providing a disposable diaper fixed to the bag.

  Further, the present invention is to cut a tape continuous body composed of a fastening tape continuous body and a release tape continuous body in the width direction at a predetermined interval so as to have the dimensions of each of the fastening tapes. A step of obtaining a tape composite in which the release tape is laminated on one end side in the longitudinal direction, and both sides of a continuous diaper body produced separately from a portion of the tape composite in which the release tape is not laminated in the fastening tape A portion where the release tape in the fastening tape of the tape composite is disposed on the non-skin contact surface of each edge portion is arranged on the skin contact surface of each side edge portion of the diaper body continuous body. Arranged on the non-skin contact surface of the diaper body continuous body of the tape composite and the skin contact surface While integrally pressed in the thickness direction and a portion, by providing a method for manufacturing a disposable diaper and a process of fusing the non-skin contact surface side, it is obtained by achieving the above object.

  According to the disposable diaper of the present invention, when a non-woven fabric is bonded to the non-skin contact surface side of the diaper main body, or a soft non-woven fabric is used on the non-skin contact surface side or the skin contact surface side of the diaper main body. Even in this case, the adhesive fastening tape has a sufficient adhesive holding force with the diaper main body.

Hereinafter, a preferred embodiment of the disposable diaper of the present invention will be described with reference to FIGS.

The disposable diaper 1 of the present embodiment is a deployment-type disposable diaper for infants, a liquid-permeable surface sheet that forms a skin contact surface, and a liquid-impermeable back sheet 3 that forms a non-skin contact surface. And the diaper main body 10 which comprises the liquid holding | maintenance absorber 4 interposed between both sheets is provided. The back sheet 3 of the diaper main body 10 is formed by laminating a substantially identical nonwoven fabric on a resin film sheet, and the nonwoven fabric is the outer surface. Moreover, the diaper main body 10 has a crotch part A at the central part in the longitudinal direction, and a back side part (one part in the longitudinal direction) B and an abdominal side part (before and after the crotch part A in the longitudinal direction) The other part) C is included.
As shown in FIG. 1, a fastening tape 5 is provided on each side edge 12, 12 of the back side B of the diaper main body 10, and the fastening tape 5 is fastened to the outer surface of the abdominal side C. A landing zone 14 is provided. In the present embodiment, both side edges 12 and 12 of the back side B of the diaper main body 10 are formed from the back sheet 3 extending outward from both side edges of the absorbent body 4.
The fastening tape base material 51 of the fastening tape 5 in the disposable diaper 1 of this embodiment is bent so as to extend from the non-skin contact surface side of the diaper main body 10 to the skin contact surface side, as shown in FIGS. The portion 54 of the fastening tape substrate 51 located on the skin contact surface side of the diaper main body 10 is detachable on the release tape 6 bonded and fixed to the skin contact surface side of the diaper main body 10. Bonded and fixed. The portion 55 located on the non-skin contact surface side of the diaper body 10 in the fastening tape substrate 51 is fused to the non-skin contact surface side of the diaper body 10 by ultrasonic sealing from the non-skin contact surface side. It is fixed. 1 and 2, the right side (when worn) of the diaper 1 has been described, but the left side is configured in exactly the same manner. The same applies to each drawing described later.

  The fastening tape 5 in the disposable diaper 1 of the present embodiment will be described in detail. As shown in FIG. 2, the fastening tape 5 is bonded to the surface facing the resin-made fastening tape substrate 51 and the diaper main body 10. It has a layer 52. The fastening tape substrate 51 has a substantially rectangular shape that is vertically long when viewed in plan, and the fastening tape adhesive layer 52 is applied to the entire surface of the fastening tape 5 with a substantially constant basis weight. preferable.

As shown in FIG. 2, the portion 55 located on the non-skin contact surface side of the diaper main body 10 in the fastening tape base 51 is a portion having a predetermined width from one end in the longitudinal direction, and the back side portion B in the diaper main body 10. The side edge portion 12 is bonded to the non-skin contact surface side via a fastening tape adhesive layer 52.
In addition, the portion 55 is in a state where the fastening tape base 51 is bent at the side edge 13 of the back side portion B so as to extend from the non-skin contact surface side of the diaper body 10 to the skin contact surface side. The diaper body 10 is preferably fused and fixed to the non-skin contact surface side of the diaper body 10 by ultrasonic sealing or heat sealing from the non-skin contact surface side. In the present embodiment, the portion 55 is fused and fixed to the back sheet 3 of the side edge portion 12 by ultrasonic sealing.

  The ultrasonic sealing process in the diaper 1 of the present embodiment is performed in a state where the fastening tape base material 5 is bent from the non-skin contact surface side to the skin contact surface side of the diaper main body 10. 51 is pressed between the non-skin contact surface side and the skin contact surface side of the diaper body 10 by an ultrasonic seal head and a receiving portion described later, and ultrasonic vibration is generated from the non-skin contact surface side. Done.

  Ultrasonic sealing is preferable in that the time required for the sealing is short. In addition, heat generated by ultrasonic sealing is not generated directly from the ultrasonic seal head, but heat is generated from the inside of the seal by the vibration energy of ultrasonic waves. Particularly preferred. Therefore, the fastening tape 5 is not torn off due to damage during the sealing process when the diaper 1 is worn, and has a good appearance. Furthermore, since ultrasonic waves are applied only from the non-skin contact surface side of the diaper main body 10, the ultrasonic sealing trace 57 of the portion 54 is an ultrasonic sealing trace 58 of the portion 55 as shown in FIG. Less than

In the diaper 1 of this embodiment, the ultrasonic sealing process in the portion 55 may be performed on the entire surface of the portion 55 or may be performed partially. When ultrasonic sealing is partially performed, the processing pattern may be continuous or discrete.
Further, when the ultrasonic sealing process is partially performed, the portion 55 and the diaper main body 10 are fused so that a sufficient adhesive holding force can be obtained between the fastening tape base 51 and the diaper main body 10. The area is preferably 2 to 20% with respect to the area of the portion 55. Moreover, it is preferable that the area of the melt | fusion part per location is 2-20 mm < ² >, and it is preferable that the number of the melt | fusion part locations is 2-20.

In this embodiment, as shown in FIG. 3A, ultrasonic sealing is partially performed, and four substantially rectangular fusion parts are formed. Moreover, in this embodiment, the said fusion | melting area is 6%, and the said fusion | melting part area per location is 9 mm < ² >. In addition, as shown in FIG. 3B, the ultrasonic sealing pattern is also preferably a pattern in which short linear fused portions are arranged in a straight line.

  In the diaper 1 of the present embodiment, one end portion in the longitudinal direction of the portion 54 is folded back to the non-skin contact surface side as shown in FIG. 2, and the fastening tape adhesive layers 52 are bonded to each other. Thus, a tag 56 is formed. The portion 54 is detachably bonded onto the release tape 6 so that the edge of the tag 56 is aligned with one edge of the release tape 6. When the diaper 1 is mounted, the fastening tape 5 is peeled off from the release tape 6 by holding the tag 56 as shown in FIG.

As shown in FIG. 2, the release tape 6 in the diaper 1 of the present embodiment has a release tape adhesive layer 62 on the surface facing the resin release tape base 61 and the diaper main body 10. The release tape base 61 has a vertically long, substantially rectangular shape that is shorter than the fastening tape base 51 in plan view when deployed. It is preferable that the release tape base 61 is coated with a release agent over the entire surface on one side facing the fastening tape 5 (opposite the surface on which the release tape adhesive layer 62 is applied). The release tape pressure-sensitive adhesive layer 62 is preferably coated with a substantially constant basis weight on the other surface of the other side.
As shown in FIG. 2, the release tape base 61 has one side edge in the longitudinal direction of the release tape base 61 on the skin contact surface side of the side edge 12 of the back side B in the diaper main body 10. It is aligned with the edge 13 and is bonded via a release tape adhesive layer 62 at a position facing the portion 55 across the diaper main body 10.

In the diaper 1 of the present embodiment, the length of the fastening tape base 51 when deployed is preferably 40 to 120 mm, the width is preferably 15 to 50 mm, and the basis weight is 50 to 150 g / m ² is preferable.
The length of the release tape base 61 when deployed is preferably 20 to 60 mm, and the width is preferably the same as the fastening tape base 51, specifically 15 to 50 mm. The basis weight is preferably ²⁰ to 100 g / m ² .
It is preferable that the length of the part 55 located in the non-skin contact surface side of the diaper main body 10 of the fastening tape base material 51 is 10-60 mm.

The disposable diaper 1 of the present embodiment will be further described. It is preferable that a pair of three-dimensional gather portions having a plurality of elastic members are provided along both longitudinal sides of the absorbent body 4. Moreover, it is preferable that a leg flap part is provided in each width direction outer side of a pair of this solid gather part. Moreover, it is preferable that the waist expansion-contraction part is provided in the back side part B and the abdominal side part C in the diaper 1, respectively. Furthermore, it is preferable that a pair of width direction expansion-contraction parts is provided on both sides of the back side part B.
Both side edges 12, 12 of the back side portion B of the diaper main body 10 in the disposable diaper 1 of the present embodiment may be formed from the top sheet extending outward from both side edges of the absorbent body 4, or In addition, it may be formed from the back sheet 3 that extends in the same manner, may be formed from the top sheet and the back sheet 3 that extend in the same way, and the skin contact surface side is also the leg flap. The non-skin contact surface side may be formed from the back surface sheet 3.

In the diaper 1 of the present embodiment, as a material for forming the fastening tape substrate 51, various tape materials used in conventional disposable diapers and the like can be used. It is preferable that the surface opposite to the surface on which the layer is formed is peeled.
As a material for forming the release tape base 61, various tape materials used in conventional disposable diapers and the like can be used. In particular, a polypropylene film or non-woven fabric is opposite to the surface on which the adhesive layer is formed. The surface of which is peeled is preferable.
As a material for forming the fastening tape adhesive layer 52 and the release tape adhesive layer 62, various adhesive materials used in conventional disposable diapers and the like can be used. A melt adhesive material is preferred.

As the material for forming the non-woven fabric in the back sheet 3 of the diaper 1 of the present embodiment, a fabric-like material having a high texture is preferably used. Etc. The lower basis weight of the nonwoven fabric is preferable from the viewpoint of improvement in texture and drape, but the higher one is preferable from the viewpoint of strength. Considering these balances, the basis weight is preferably 10 to 30 g / m ² . The fibers constituting the nonwoven fabric include polyethylene (PE) fibers, polypropylene (PP) fibers, ethylene copolymer fibers, propylene copolymer fibers, and bicomponent fibers composed of these materials (for example, core-sheath fibers and side-by-side fibers). Type fiber)) or a combination of two or more.

  According to the disposable diaper 1 of this embodiment described above, the fastening tape base 51 and the back sheet having the outer surface of the nonwoven fabric in the diaper main body 10 are fused and fixed by ultrasonic sealing. Adhesive holding force sufficient between the diaper main body 10 is given. Moreover, since the fastening tape base material 51 is adhere | attached with the back surface sheet 3 via the fastening tape adhesion layer 52, the adhesion retention strength between the fastening tape 5 and the diaper main body 10 is further heightened.

  Next, the manufacturing method of the disposable diaper of this invention is demonstrated about the preferable embodiment of the manufacturing method of the disposable diaper 1 mentioned above.

In the manufacturing method of this embodiment, the tape continuous body 7 including the fastening tape continuous body 53 and the release tape continuous body 63 is cut in the width direction at predetermined intervals so as to have the dimensions of the individual fastening tape 5. The step of obtaining a tape composite 71 in which the release tape 6 is laminated on one end in the longitudinal direction of the fastening tape 5 (hereinafter also referred to as the first step), and the fastening tape of the tape composite 71 as shown in FIG. The portion 72 where the release tape is not laminated is placed on the non-skin contact surface of each side edge of the separately manufactured diaper body continuous body 11, and the release tape 6 of the fastening tape 5 of the tape composite 71 is laminated. The process (it is also hereafter called a 2nd process) which arrange | positions the part 73 currently performed on each skin contact surface of the both-sides edge part of the diaper main body continuous body 11. The non-skin contact while pressing the portion disposed on the non-skin contact surface of the diaper body continuous body 11 of the tape composite 71 and the portion disposed on the skin contact surface integrally in the thickness direction. And a step of fusing from the surface side (hereinafter also referred to as a third step). The fastening tape base material portion of the portion 72 corresponds to the portion 55 located on the non-skin contact surface side of the diaper main body 10 in the fastening tape base material 51.
In this embodiment, the diaper main body 10 is manufactured by a so-called longitudinal flow method in which the longitudinal direction is parallel to the flow direction.
Hereinafter, although the manufacturing method of this embodiment is explained in full detail, the said process has the same structure on either side. Mainly, one side will be described, but the other side is the same.

First, the first step will be described below.
In the fastening tape continuous body 53 in which the fastening tape 5 is continuous in the width direction, as shown in FIG. 6A, one side edge portion in the longitudinal direction is folded upward by a predetermined width, and the fastening tape adhesive layers 52 are connected to each other. Adhering to form a continuous tag 56.
Next, on the fastening tape continuous body 53 formed as described above, a release tape continuous body 63 in which the release tape 6 is continuous in the width direction, one side edge in the longitudinal direction, and a side edge of the continuous tag 56. Are attached so as to be aligned with each other, and are detachably bonded to form a continuous tape body 7 as shown in FIG.
In this way, the tape continuous body 7 is manufactured, and the fastening tape 5 is conveyed to the cutter roll 81 in the second step so as to be continuous in the width direction as indicated by an arrow P in FIG.

Next, the second step will be described below.
In the cutter roll 81, the tape continuous body 7 formed as described above is cut along the imaginary line 74 so as to have the dimensions of the individual fastening tapes 5, and as shown in FIG. After the tape composite 71 is manufactured, the tape composite 71 is supported on the anvil roll 82. In the tape composite 71, the release tape 6 is detachably bonded on the unfolded fastening tape substrate 51 having the tag 56 with the release tape adhesive layer 62 facing the outer surface. Further, the anvil roll 82 is provided with support means for the tape composite 71 such as an intake system, a pin hold, and a mechanical chuck.
The tape composite 71 formed as described above is supported on the anvil roll 82 and is intermittently sent to the first stamper 80 as the anvil roll 82 rotates.

  On the other hand, although not shown in FIG. 5, the absorbers 4 are sequentially placed on the continuous back sheet 3 at equal intervals, and the top is covered with the continuous strip-shaped top sheet. The continuous body 11 in which the diaper body 10 is continuous is manufactured by joining, and is conveyed to the first stamper 80 as indicated by an arrow Q in FIG.

  In the first stamper 80, the tape composite 71 is intermittently arranged on the non-skin contact surface side of the diaper main body continuous body 11, and the portion 72 where the release tape of the fastening tape of the tape composite 71 is not laminated; The non-skin contact surface side of the diaper main body continuous body 11 is integrally pressure-bonded with the anvil roll 82 as shown in FIG. A portion 55 located on the non-skin contact surface side of the diaper body in the fastening tape base material is bonded to the non-skin contact surface side of the diaper body continuous body 11 via the fastening tape adhesive layer 52.

At this time, one end edge in the longitudinal direction of the release tape 6 (the direction opposite to the tag 56) and one side edge in the longitudinal direction of the diaper body continuous body 11 are bonded so as to contact each other. The adhesion pressure in the first stamper 80 is preferably 1 to 10 N / m ² . The first stamper 80 has a rotation axis parallel to the anvil roll 82, and a pair of stamper heads are provided on the rotation axis at substantially the same interval as the width of the diaper body continuous body 11. The first stamper 80 presses the tape composite 71 conveyed intermittently to the non-skin contact surface side of the diaper body continuous body 11 while rotating the pair of stamper heads. The position on the non-skin contact surface side of the diaper main body continuous body 11 to which the tape composite 71 is bonded is a position that becomes both side edges of the back side portion B when it becomes the individual diaper 1 in the future.
Next, the tape composite 71 that is intermittently bonded to both side edges of the diaper main body continuous body 11 is conveyed to the folding guide 83 together with the diaper main body continuous body 11.

  In the folding guide 83, as shown in FIGS. 7 (a) and 7 (b), the fastening tape 5 is extended from the non-skin contact surface side to the skin contact surface side at both side edges of the diaper body continuous body 11. The portion 73 where the release tape 6 of the fastening tape 5 of the tape composite 71 is folded is laminated on the skin contact surface side of the diaper body continuous body 11. Next, the tape composite 71 is conveyed to the folding crimping device 84 together with the diaper main body continuous body 11.

In the folding crimping device 84, the release tape base 61 positioned below the portion 73 is crimped and fixed to the skin contact surface side of the diaper main body continuous body 11 via the release tape adhesive layer 62. The crimping pressure in the folding crimping device 84 is preferably 1 to 10 N / m ² . The folding crimping device 84 has a belt wider than the portion 73, and the belt 73 is rotated by a plurality of rollers, and the portion 73 is moved by the belt to the skin contact surface side of the diaper body continuous body 11. Press on.
Next, the tape composite 71 is transported together with the diaper main body continuous body 11 to the ultrasonic sealing device 91 in the third step.

Next, the third step will be described below.
In the ultrasonic sealing apparatus 91, the portion 73 is pressed from above by the roller of the second stamper, and the portion 72 is pressed from the non-skin contact surface side of the diaper main body continuous body 11 by the ultrasonic seal head 91. While, ultrasonic vibration was applied for a predetermined time by the ultrasonic seal head 91, and the portion 72 and the non-skin contact surface side of the diaper body continuous body 11 were fused and fixed as shown in FIG. 7C. To do.

  The ultrasonic seal head 91 may be in full contact with the portion 72 or may be in partial contact. The contact portion of the ultrasonic seal head 91 with the portion 72 is preferably smooth. When the ultrasonic seal head 91 is in partial contact with the portion 72, the shape of the contact portion of the ultrasonic seal head 91 in plan view may be continuous or discrete as shown in FIG. May be good. The area of the fused portion formed in the portion 72 by the ultrasonic sealing process is also referred to as a contact area. During the ultrasonic oscillation, while the tape composite 71 moves with the diaper body continuous body 11, the ultrasonic sealing is performed. This is the area where the head 91 and the portion 72 abut.

Further, when the ultrasonic seal head 91 partially abuts on the portion 72, the ultrasonic wave is applied to the portion 72 and the ultrasonic wave so that sufficient fusion can be achieved between the fastening tape base 51 and the diaper body 10. The contact area with the seal head 91 is preferably 2 to 20% with respect to the area of the portion 72. Further, when the ultrasonic seal head 91 is in partial contact with the portion 72 and is in discrete contact as shown in FIG. 3, the contact portion area per location is ^{2 to 20} mm ^2. It is preferable that the number of contact portions is 2 to 20.

In the ultrasonic sealing process of this embodiment, the ultrasonic frequency is preferably 15 k to 150 kHz, and the output is preferably 10 to 100 W. Moreover, it is preferable that the pressure which a seal part receives between an ultrasonic seal head and a 2nd stamper is 5-50 N / cm < ² >.

The manufacturing method of the disposable diaper 1 of this invention comprises the 1st process mentioned above, the 2nd process, and the 3rd process, and the other part of the diaper 1 is manufactured in accordance with a conventional method. For example, the leg flap portion, the three-dimensional gather portion, the waist stretchable portion and the width direction stretchable portion are preferably formed at predetermined positions at predetermined intervals on the diaper body continuous body 11, and then cut at predetermined intervals. The disposable diaper 1 described above is obtained. Moreover, it is also preferable to perform a predetermined cutting process in a predetermined process as necessary.
According to the present embodiment, the diaper main body continuous body 11 and the portion 72 are super in a state where the tape composite 71 is bent from the non-skin contact surface side of the diaper main body continuous body 11 to the skin contact surface side. It is integrally fused and fixed by sonic sealing.
Moreover, since the ultrasonic processing apparatus 9 can be easily added to the existing diaper manufacturing process, the existing manufacturing process can be modified at a low cost.

The disposable diaper 1 of the present invention is not limited to the above-described embodiments and embodiments, and can be appropriately changed without departing from the gist of the present invention.
For example, in the disposable diaper 1 of this embodiment, the portion 51 located on the non-skin contact surface side of the diaper body in the fastening tape base material is fused with the non-skin contact surface side of the diaper body 10 by ultrasonic sealing. Although fixed, it may be fused and fixed by other means such as heat sealing.
Further, the release tape base 61 in the disposable diaper 1 of the present embodiment is not fused and fixed to the diaper main body 10 by ultrasonic sealing, but a portion 54 located on the skin contact surface side of the fastening tape base is provided. The release tape base 61 may be fused and fixed to the diaper main body 10 by ultrasonic sealing.

In the embodiment of the manufacturing method of the disposable diaper 1 of the present invention, the portion 72 where the release tape is not laminated in the fastening tape of the tape composite is formed by ultrasonic sealing with the non-skin contact surface side of the diaper body continuous body 11. Although fused and fixed, other fusion processing means such as heat sealing may be used.
Moreover, although the ultrasonic seal processing apparatus is provided at a position facing the second stamper, the ultrasonic seal processing apparatus may be provided in a process subsequent to the second stamper.
Although the disposable diaper of this invention may be a disposable diaper for infants, it may be a disposable diaper for adults.

  Hereinafter, the present invention will be further described using examples. However, the scope of the present invention is not limited to such examples.

Fastening tape base material (material polypropylene film, length 70 mm, width 25 mm, basis weight 125 g / m 2) and a continuous fastening tape base material and release tape base material (material polypropylene film, length 40 mm, width) A tape continuum was produced according to the above-described embodiment using a release tape continuum having a width of 25 mm and a basis weight of 95 g / m2) in the width direction. Each of the fastening tape base material and the release tape base material has an adhesive layer provided on the entire surface. The adhesive of the fastening tape adhesive layer is a solvent-based adhesive having a synthetic rubber as a main component, and has a basis weight of 30 g / m ² . The pressure-sensitive adhesive for the release tape pressure-sensitive adhesive layer is a solvent-based pressure-sensitive adhesive mainly composed of synthetic rubber and has a basis weight of 20 g / m ² . Moreover, the release agent is applied to the entire one surface of the release tape substrate (the surface on which the release tape adhesive layer is not applied).
The back sheet of the diaper body is made of a polyethylene resin film sheet with a spunbond nonwoven fabric (basis weight 15g / m ² ) made of polypropylene fiber as the outer surface, and an adhesive applied to the entire surface. It was. Further, the skin contact surface side of both side edges of the back side portion of the diaper main body is formed of an SMS (spunbond / meltblown / spunbond) nonwoven fabric made of polypropylene fibers.

A disposable diaper was manufactured according to the above-described embodiment, except that the above-described members were used and ultrasonic sealing was performed using a handy-type ultrasonic sealing machine. In the cutter roll, the continuous tape was cut to 25 mm in the longitudinal direction. The adhesion pressure in the first stamper is 5 N / m ² , the crimping pressure in the folding crimping apparatus is 3 N / m ² , and the welding pressure in ultrasonic sealing is 20 N / cm ² . In the ultrasonic sealing process, the ultrasonic frequency is 60 kHz, and the output is 18 W.
Moreover, the fusion area in the part located in the non-skin contact surface side of the diaper main body of a fastening tape base material is 12%, and the eight fusion parts of 9 mm < ² > of fusion part areas were formed.
The part located on the non-skin contact surface side of the diaper main body of the fastening tape base is 25 mm in length, adhered by a fastening adhesive layer, and fused by ultrasonic sealing, and the back surface of the diaper main body The sheet 3 is fixed.

  From the disposable diaper manufactured as described above, the side edge of the right side of the diaper body (when worn, the same applies hereinafter) from the disposable diaper toward the inner side in the width direction from the side edge of the right side of the back side as shown in FIG. The test piece was cut into a size of 80 mm and 90 mm from the waist opening edge on the back side toward the crotch so as to include the fastening tape.

[Comparative Example 1]
A disposable diaper was produced in the same manner as in the example except that the ultrasonic sealing was not applied, and a test piece similar to that in the example was produced.

[Comparative Example 2]
Using a fastening tape continuum and a release tape continuum similar to those in Comparative Example 1, as shown in FIG. 8, a part of the adhesive surfaces of the fastening tape and the release tape are bonded to each other to form a so-called Y-structure tape composite. Manufactured. When the tape composite body having the Y configuration is manufactured as a tape continuous body, in FIG. 6A, one side edge portion in the longitudinal direction of the release tape continuous body (the side edge portion to be bonded to the tag 56 in the future) It is manufactured in the same manner as in the above-described embodiment except that the opposite side) is folded downward by a predetermined width, the release tape base materials 61 are overlapped, and then bonded onto the fastening tape continuous body.

The other structure manufactured the disposable diaper similarly to the comparative example 1. FIG. The fastening tape of the diaper of Comparative Example 2 has an overlap of 5 mm in the longitudinal direction with the release tape, as shown in FIG. In addition, in FIG. 8, the fastening tape has shown the state peeled from the release tape and opened.
From the disposable diaper of the comparative example 2, the test piece similar to an Example was produced.

<Adhesive retention force>
As shown in FIG. 9, each of the above test pieces is faced with the fastening tape facing downward, the upper side edge of the diaper main body portion is fixed, the fastening tape is picked up and peeled off from the release tape, and the tag is opened. A weight M having a mass of 1.2 kg was hung on the part, and the time until the fastening tape was removed from the diaper main body part was measured in an atmosphere of 35 ° C., and this time was taken as an adhesive holding force. The results are shown in Table 1.
As is apparent from the results shown in Table 1, it can be seen that the fastening tape in the disposable diaper of this example has a high adhesive holding force with respect to Comparative Examples 1 and 2. In particular, it can be seen that the fastening tape of Comparative Example 1 has a very weak adhesion holding force.

FIG. 1 is a perspective view showing a main part of the present embodiment of the disposable diaper of the present invention. 2 is a cross-sectional view taken along line XX of FIG. FIG. 3 is a plan view showing an ultrasonic seal processing pattern. FIG. 3A is a diagram in which substantially rectangular patterns are discretely arranged, and FIG. 3B is a diagram in which short linear patterns are arranged in a straight line. FIG. 4 is a perspective view showing a state where the fastening tape is peeled from the release tape. FIG. 5: is a perspective view which shows the principal part of this embodiment of the manufacturing method of the disposable diaper of this invention. FIG. 6: is a perspective view of the tape continuous body which shows the principal part of this embodiment of the manufacturing method of the disposable diaper of this invention, (a) is before tape continuous body formation, (b) is tape continuous body formation. Later, (c) is a cut piece of the tape continuum. FIG. 7 is a side sectional view (corresponding to FIG. 2) of the tape composite showing the main part of this embodiment of the manufacturing method of the disposable diaper of the present invention, and (a) is a side sectional view before and after bonding the first stamper. (B) is a side sectional view after folding, and (c) is a side sectional view after ultrasonic sealing. FIG. 8 is a side cross-sectional view of the fastening tape of Comparative Example 2 corresponding to FIG. FIG. 9 is a front view schematically showing the main part of the evaluation method for measuring the adhesion holding force.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Disposable diaper 10 Diaper main body 11 Diaper main body continuous body 12 Side edge part of back side part 13 Side edge of back side part 2 Skin contact surface side of diaper 3 Back surface sheet 4 Absorber 5 Fastening tape 51 Fastening tape base material 52 Fastening Tape Adhesive Layer 53 Fastening Tape Continuum 54 Portion of Fastening Tape Substrate Located on Skin Contact Surface Side of Diaper Main Body 55 Portion of Fastening Tape Substrate Positioned on Non-Skin Contact Surface Side 56 Fastening Tape Tag 57 Ultrasonic sealing mark on the skin contact surface side 58 Ultrasonic sealing mark on the non-skin contact surface side 6 Release tape 61 Release tape base material 62 Release tape adhesive layer 63 Release tape continuous body 7 Tape continuous body 71 Tape composite 72 Release tape in fastening tape of tape composite 73 where the release tape is laminated in the fastening tape of the tape composite 74 Virtual line 80 First stamper 81 Cutter roll 82 Anvil roll 83 Folding guide 84 Folding and crimping device 85 Second stamper 9 Ultrasonic seal Processing equipment 91 Ultrasonic seal head M Weight

Claims (3)

A disposable diaper in which a fastening tape is provided on each side edge of the diaper body,
The tape base material of the fastening tape is bent so as to extend from the non-skin contact surface side of the diaper body to the skin contact surface side, and is positioned on the skin contact surface side of the diaper body in the tape base material. The portion to be fixed is detachably fixed on the release tape fixed to the skin contact surface side of the diaper main body, and the portion located on the non-skin contact surface side of the diaper main body in the tape base material The disposable diaper currently fixed to the non-skin contact surface side of the said diaper main body by the melt | fusion process from this non-skin contact surface side.   The disposable diaper of Claim 1 with which the adhesion layer is provided in the surface facing the said diaper main body of each of the said fastening tape and the said release tape. It is a manufacturing method of the disposable diaper of Claim 1, Comprising: The tape continuous body which consists of a fastening tape continuous body and a release tape continuous body in the width direction by the predetermined space | interval so that it may become the dimension of each said fastening tape. Cutting to obtain a tape composite in which the release tape is laminated on one end side in the longitudinal direction of the fastening tape;
The fastening part of the tape composite in which the release tape is not laminated is disposed on the non-skin contact surfaces of both side edges of the diaper body continuous body manufactured separately, and the fastening of the tape composite is performed. Placing the portion of the tape on which the release tape is laminated on the skin contact surface of each side edge of the diaper body continuum; and
The non-skin contact surface while pressing the portion disposed on the non-skin contact surface and the portion disposed on the skin contact surface of the diaper main body continuous body of the tape composite integrally in the thickness direction The manufacturing method of a disposable diaper provided with the process fused from the side.

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