JP2015042214A - Joining device for sheet and method of manufacturing disposable diaper using joining device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device which can prevent creases from being formed on a joining part of a sheet.SOLUTION: A joining device includes an emboss roll 1, joining means 2, 3, wrap angle forming means 4, and tension imparting means 5. The wrap angle forming means 4 includes an upstream guide roll 41 provided on an upstream side of the emboss roll 1 and a downstream guide roll 42 provided on a downstream side of the emboss roll 1, and the guide rolls 41, 42 are arranged in such a manner that respective sheets S1-S3 form prescribed wrap angles and travel by making contact with the emboss roll 1. The tension imparting means 5 includes a pair of upstream facing rolls 5a which are provided on an upstream side of the upstream guide roll 41 and rotate by sandwiching the sheets S1-S3 and a pair of downstream facing rolls 5b which are provided on a downstream side of the downstream guide roll 42 and rotate by sandwiching the sheets S1-S3.

Description

  The present invention relates to a sheet joining apparatus and a method for manufacturing a disposable diaper using the joining apparatus. More specifically, the bonding apparatus of the present invention is an apparatus for introducing a sheet between an embossing roll and an ultrasonic horn and bonding another sheet to a certain sheet. In particular, when the elastic elastic member contracts, the joining device of the present invention intermittently joins the two layers of sheets joined to the elastic elastic member in the extended state along the extending direction of the elastic elastic member. The disposable diaper having a “flute structure” in which a space is formed between the two layers of sheets is used.

  2. Description of the Related Art Conventionally, a sheet joining apparatus has been used in an apparatus for manufacturing an article formed by laminating sheets such as disposable diapers. As such a joining apparatus, for example, an overlapping sheet is introduced between an embossing roll having a convex part and an uneven roll having a groove meshing with the convex part of the embossing roll, and the sheets are joined to each other. A thing is well known (for example, patent document 1). Moreover, as a joining apparatus, the overlapping sheet | seat is introduce | transduced between the embossing roll which has a convex part, and the ultrasonic horn which ultrasonically vibrates, and sheets are joined by the frictional heat provided by ultrasonic vibration. A thing is also known (for example, patent document 2).

  Conventionally, it is known to manufacture disposable diapers for infants and the elderly using a sheet joining apparatus. In particular, in recent years, it has been known that a disposable diaper having a so-called “flute structure” is produced on a front gathered part and a rear gathered part of a diaper using a sheet joining device (Patent Document 3, Patent). Reference 4). This "flute structure" means that when the elastic stretchable member contracts by intermittently joining the two layers of sheets sandwiching the stretched elastic stretchable member along the extending direction of the elastic stretchable member. This means a structure in which a space is generated between the two layers of sheets. Disposable diapers having a “flute structure”, for example, are formed by intermittently joining cushion-forming sheets to the front body side end part and the back body side end part of the outer sheet disposed from the front body to the back body, respectively. Is formed. And by fixing the elastic elastic member in an extended state between the cushion forming sheet and the outer sheet, when the elastic elastic member contracts, a space is generated between the outer sheet and each cushion forming sheet. ing.

  FIG. 12 shows an example of a joining device used when manufacturing a disposable diaper having the “flute structure”. FIG. 12A shows an outline of a side surface of the joining apparatus, and FIG. 12B shows an outline of a plane when the joining apparatus is viewed from the embossing roll side. As shown in FIG. 12A, the joining device includes an embossing roll 1 ′ having a convex portion according to the joining pattern of the sheet, and an ultrasonic horn 2 ′ provided at a position facing the embossing roll 1 ′. 3 '. As shown in FIG. 12B, the embossing roll 1 ′ includes a roll body 10 ′ having a rotation axis and two pattern blocks 11 ′ and 12 ′ provided in the vicinity of both ends in the axial direction of the roll body 10 ′. It has. Although not shown, the ultrasonic horns 2 'and 3' are provided at positions facing the two pattern blocks 11 'and 12', respectively.

As shown in FIG. 12 (b), between the embossing roll 1 'and the ultrasonic horns 2' and 3 ', an outer sheet 111' that forms a disposable diaper and cushion-forming sheets 112 'and 113' are introduced. Is done. The outer sheet 111 'is continuous so as to be long according to the conveying direction of the manufacturing apparatus, and both ends in the width direction of the continuous body constitute a front body and a back body of the diaper. Similarly, the cushion forming sheets 112 ′ and 113 ′ are continuous so as to be long according to the conveying direction of the manufacturing apparatus. A continuous body of these sheets is formed between the embossing roll 1 ′ and the ultrasonic horns 2 ′ and 3 ′ in a state where the cushion forming sheets 112 ′ and 113 ′ overlap each other at both ends in the width direction of the outer sheet 111 ′. be introduced. The pattern blocks 11 ′ and 12 ′ of the embossing roll 1 ′ sandwich the overlapping portions of the outer sheet 111 ′ and the cushion forming sheets 112 ′ and 113 ′ between the ultrasonic horns 2 ′ and 3 ′. Thereby, frictional heat is applied to the sheets sandwiched between the pattern blocks 11 ′ and 12 ′ and the ultrasonic horns 2 ′ and 3 ′ by the ultrasonic vibrations of the ultrasonic horns 2 ′ and 3 ′. Heat welded. The pattern blocks 11 ′ and 12 ′ are formed with intermittent patterns in which a plurality of convex portions are provided at predetermined intervals in the rotation direction of the roll body 10 ′. Therefore, the outer sheet 111 ′ and the cushion forming sheets 112 ′ and 113 ′ that have passed between the pattern blocks 11 ′ and 12 ′ and the ultrasonic horns 2 ′ and 3 ′ are, as shown in FIG. It is joined intermittently.
Thus, in manufacturing a disposable diaper having a “flute structure”, the outer sheet 111 ′ and the cushion forming sheets 112 ′ and 113 ′ can be intermittently joined.

JP 2000-079652 A JP 2012-000384 A JP 2011-254996 A JP 2008-136793 A

  However, when the outer sheet 111 ′ and the cushion forming sheets 112 ′ and 113 ′ are intermittently joined by the joining device shown in FIG. 12, there is a problem that wrinkles are generated at the overlapping portions of the sheets. . As shown in FIG. 12 (b), when wrinkles occur at the overlapping parts of the sheet, the texture of the disposable diaper having the “flute structure” is impaired, or a space is not formed between the layers of the sheet. There was a problem that defective products were generated in disposable diapers.

As a cause of the occurrence of wrinkles in such a joined sheet, first, it is conceivable that the pattern blocks 11 'and 12' of the embossing roll 1 'are higher than the roll body 10'.
That is, when the pattern blocks 11 ′ and 12 ′ are one step higher than the roll body 10 ′, the overlapping position of the outer sheet 111 ′ and the cushion forming sheets 112 ′ and 113 ′ is the pattern blocks 11 ′ and 12 ′. And the ultrasonic horns 2 'and 3', a tensile force (rotational force) by the embossing roll 1 'is applied only to the overlapping portion. For this reason, the overlapping part of the outer sheet 111 ′ and the cushion forming sheets 112 ′ and 113 ′ is pulled by the rotation of the embossing roll 1 ′ and transported to precede the other part as compared with other parts. End up. As a result, when the two sheets are joined, distortion occurs in the overlapping portion of the sheet and other portions, and the distortion causes wrinkles in the overlapping portion of both sheets.

  Furthermore, if the pattern of the convex portions provided on the pattern blocks 11 ′ and 12 ′ is intermittent, the force is applied to the overlapping portion of the sheet for a moment when the convex portions and the ultrasonic horns 2 ′ and 3 ′ come into contact with each other. However, a constant force is not applied to the overlapping portion of the sheet. That is, the moment at which the rotational force by the embossing roll 1 ′ is applied and the moment at which it is not applied alternately occur at the overlapping position of both sheets, and distortion occurs at the overlapping position of both sheets. As a result, this distortion is considered to cause wrinkles at the overlapping portions of both sheets.

  In the joining apparatus shown in FIG. 12, the outer sheet 111 ′ and the cushion forming sheets 112 ′ and 113 ′ are guided by the guide rolls 41 ′ and 42 ′ positioned on the upstream side and the downstream side of the embossing roll 1 ′. Travel straight. And the embossing roll 1 'and ultrasonic horn 2', 3 'are provided in the position which each sheet | seat is drive | working linearly. This is considered to promote the generation of wrinkles in the joined sheets. That is, as shown in FIG. 12, the embossing rolls 1 'and the ultrasonic horns 2' and 3 'are provided at the positions where both sheets travel linearly, so that the overlapping position of both sheets is the embossing roll 1 Only the pattern blocks 11 'and 12' of 'are in contact with each other. As a result, there is a difference in the force pulled in the conveying direction due to the rotation of the embossing roll 1 ′ between the portions that are in contact with the pattern blocks 11 ′ and 12 ′ and the portions that are not in contact with each other, which causes distortion of the sheet. .

  Therefore, at the present time, when joining other sheets to both ends in the width direction of a long sheet that travels, there is a demand for a joining apparatus that can prevent wrinkles from occurring at the joining portion of both sheets. Also, there is a need for a manufacturing method for a disposable diaper having a flute structure, which can prevent wrinkles from occurring at the joint portion of both sheets when intermittently joining two layers of sheets having a flute structure. Yes.

  Therefore, the inventors of the present invention have intensively studied the means for solving the above-described problems of the conventional invention, and as a result, formed a pattern block near both sides in the axial direction of the roll body of the embossing roll, and this pattern block and the bonding means. The two sheets are brought into contact with the roll body at a portion other than the portion where the pattern block is provided, while the two sheets are joined by sandwiching the sheets overlapped with each other (ultrasonic seal horn or heat seal roll). Thus, it was found that by applying the rotational force of the embossing roll, joining can be performed without causing wrinkles at the overlapping portions of both sheets. Specifically, it has been found that the overlapping sheets can form a predetermined holding angle and come into contact with the embossing roll so that the overlapping positions of both sheets can be joined without causing wrinkles. Further, before and after various sheet members are introduced between the pattern block and the bonding means, the overlapped sheet members are sandwiched between a pair of roll devices to apply tension, and the wrinkles are stretched, so that wrinkles are formed at the overlapping portions of the sheets. It was found that the situation that causes Then, the inventors have conceived that the problems of the prior art can be solved based on the above knowledge, and completed the present invention.

In the first aspect of the present invention, a traveling long second sheet S2 is joined to one end of the traveling long first sheet S1 in the width direction, and the widthwise other end of the first sheet S1 is joined. The present invention relates to a joining apparatus for joining a traveling long third sheet S3. In addition, the 1st sheet | seat S1 may be comprised from the sheet | seat connected from the width direction one end part to the width direction other end part, or the width direction one end part side and the width direction other end part side It may be composed of two sheets separated by.
The joining device of the present invention includes an embossing roll 1, adhesive means 2 and 3, a holding angle forming means 4, and a tension applying means 5. The adhesion means 2 and 3 are selected from an ultrasonic seal horn or a heat seal roll.
The embossing roll 1 is a cylindrical roll main body 10 having a rotation axis that is orthogonal to the traveling direction of the first sheet S1, and an outer peripheral surface of the roll main body 10. The first sheet S1 and the second sheet S2 are overlapped. A first pattern block 11 provided at a position that abuts on a portion including the part, and a second pattern block 12 provided at a position that abuts on a part including the overlapping portion of the first sheet S1 and the third sheet S3. Have.
Here, each of the first pattern block 11 and the second pattern block 12 has an intermittent pattern in which a plurality of convex portions 11 a and 12 a are formed at predetermined intervals in the rotation direction of the roll body 10. preferable.
The bonding means 2 and 3 are provided at positions facing the first pattern block 11 and the second pattern block 12. The adhering means 2 and 3 can intermittently join both the first pattern block 11 by sandwiching the one end of the first sheet S1 in the width direction and the second sheet S2. Further, the adhering means can intermittently bond both the second pattern block 12 by sandwiching the other end in the width direction of the first sheet S1 and the third sheet S3.
Further, the holding angle forming means 4 is provided on the upstream side of the apparatus with respect to the embossing roll 1, and an upstream guide roll 41 that travels the sheets S1 to S3 of the first sheet S1, the second sheet S2, and the third sheet S3. And a downstream guide roll 42 that is provided downstream of the embossing roll 1 and travels the sheets S1 to S3.
The upstream guide roll 41 and the downstream guide roll 42 are embossed so that the sheets S1 to S3 form a predetermined holding angle and run in contact with the first pattern block 11 and the second pattern block 12. 1 is arranged upstream and downstream of the apparatus. The predetermined holding angle is, for example, 5 degrees to 180 degrees, and preferably 30 degrees to 60 degrees.
Furthermore, the tension applying means 5 is provided on the apparatus upstream side of the upstream guide roll 41, and is provided on the apparatus downstream side of the pair of upstream opposing rolls 5a that rotate by sandwiching the sheets S1 to S3, and the downstream guide roll 42, And a pair of downstream facing rolls 5b that rotate while sandwiching each of the sheets S1 to S3.

By adopting the above configuration, the present invention is specific to a joining apparatus that intermittently joins other sheets (second sheet and third sheet) to both ends of a certain sheet (first sheet) along the flow direction of the sheet. The problem can be solved. That is, when joining a 2nd sheet and a 3rd sheet | seat to each of the both ends of a 1st sheet, the 1st pattern block 11 and the 2nd pattern block 12 are formed in the roll main body 10 of the embossing roll 1, and each pattern block It is necessary to dispose an ultrasonic seal horn or heat seal roll bonding means at a position opposite to. However, when the overlapping portion of the sheet passes between the first and second pattern blocks 11 and 12 and the bonding means, the rotational force of the embossing roll 1 is applied only to the overlapping portion. For this reason, the overlapped portion of the sheet is pulled by the rotation of the embossing roll 1 as compared with other portions, and is conveyed so as to precede the other portions, and distortion occurs when the two sheets are joined. End up. Therefore, if the holding angle forming means is provided so that the sheets to be bonded form a predetermined holding angle and come into contact with the first and second pattern blocks 11 and 12, the sheets to be bonded are the first and second sheets. Even at points other than the pattern blocks 11 and 12, the roll main body 10 can be contacted to receive the rotational force of the roll main body 10. Thereby, when the overlapping position of the sheet passes between the first and second pattern blocks 11 and 12 and the bonding means, the rotational force by the roll body 10 is applied not only to the overlapping position but also to the overlapping position. Therefore, it is possible to prevent distortion from occurring between the overlapping portion of the sheet and other portions. As a result, wrinkles can be prevented from occurring when the sheets are joined.

  Moreover, when the pattern of the convex part provided in the 1st and 2nd pattern blocks 11 and 12 is intermittent, it becomes difficult to apply fixed force with respect to a sheet | seat. In this regard, as in the present invention, if a holding angle forming means is provided so that the sheet to be bonded forms a predetermined holding angle and is in contact with the first and second pattern blocks 11, 12, A relatively constant rotational force can be applied to the sheet. Therefore, wrinkles can be prevented from occurring when the sheets are joined.

  Moreover, in the joining apparatus of this invention, each sheet | seat S1-S3 forms a predetermined holding angle by arrange | positioning the upstream guide roll 41 and the downstream guide roll 42 in each of the upstream of the embossing roll 1, and downstream. In addition, the first pattern block 11 and the second pattern block 12 are in contact with each other and adjusted to travel. Further, a pair of upstream facing rolls 5a that rotate by sandwiching the sheets S1 to S3 are provided on the upstream side of the upstream guide roll 41, and the sheets S1 to S3 are sandwiched on the downstream side of the downstream guide roll 42 in the apparatus. A pair of downstream facing rolls 5b that rotate is provided. Thus, before and after the upstream guide roll 41 and the downstream guide roll 42 that adjust the pass lines of the sheets S1 to S3, a pair of upstream facing rolls 5a and a pair of downstream facing rolls 5b that sandwich and apply tension to each sheet. By providing this, the wrinkles of the sheets S1 to S3 can be stretched immediately before joining the sheets S1 to S3. Thereby, the wrinkle which arises when joining a sheet | seat more effectively can be prevented.

  In the joining device of the present invention, it is preferable that no other roll device is disposed between the upstream guide roll 41 and the pair of upstream opposing rolls 5a. Similarly, it is preferable that no other roll device is disposed between the downstream guide roll 42 and the pair of downstream facing rolls 5b.

  For example, if another guide roll is interposed between the upstream guide roll 41 and the pair of upstream opposing rolls 5a, even if the wrinkles of the sheets S1 to S3 are stretched by the pair of upstream opposing rolls 5a, There is a possibility that fine wrinkles may occur when passing through the guide roll. For this reason, each sheet member can be joined without a wrinkle by designing so that another roll apparatus may not be interposed between the upstream guide roll 41 and a pair of upstream opposing rolls 5a.

  A first point (a point where the pair of upstream facing rolls 5a sandwich the sheets S1 to S3 when the joining device of the present invention is divided into the embossing roll 1 side and the bonding means 2 and 3 side when viewed from the side. P1) and a second point (P2) where the pair of downstream facing rolls 5b sandwich the sheets S1 to S3 are third points (P3) where the upstream guide roll 41 and the sheets S1 to S3 come into contact with each other. ) And the fourth point (P4), which is the point where the downstream guide roll 42 and the sheets S1 to S3 come into contact with each other, is preferably located on the bonding means 2 and 3 side.

  By arranging the upstream guide roll 41, the downstream guide roll 42, the pair of upstream facing rolls 5a, and the pair of downstream facing rolls 5b as in the above configuration, the pair of upstream facing rolls 5a and the pair of downstream facing rolls 5b Appropriate tension can be applied to each of the sheets S1 to S3. As a result, wrinkles generated in the sheets S1 to S3 can be effectively stretched.

  When the apparatus of the present invention is viewed from the side, the embossing roll 1 and the bonding means 2 and 3 sandwich the sheets S1 to S3 on a straight line connecting the first point (P1) and the second point (P2). It is preferable that the fifth point (P5) is located.

  By arranging the first point (P1), the second point (P2), and the fifth point (P5) on a straight line as in the above configuration, the wrinkles generated in the sheets S1 to S3 are most effectively stretched. The inventor has found that this is possible.

The 2nd side surface of this invention is related with the manufacturing method of the disposable diaper using the joining apparatus which concerns on the said 1st side surface.
The manufacturing method of the present invention includes a front diaper 101, a rear body 102, a crotch portion 103 positioned between the front body 101 and the back body 102, and a disposable diaper having a flute structure using the joining device. It is a manufacturing method.
In the production method of the present invention,
A process of preparing the outer sheet 111, wherein the outer sheet 111 is composed of a single sheet connected from the front body 101 to the back body 102, or a part on the front body 101 side and the back body A step composed of two sheets separated by a portion on the 102 side;
A joint portion along the width direction of the diaper on the skin contact surface side or the skin non-contact surface side with respect to the cushion forming region 111a positioned at the front body 101 side and the back body 102 side of the outer sheet 111 And the step of joining the first cushion forming sheet 112 and the second cushion forming sheet 113 intermittently by a joining device so that the non-joining part is continuous,
One or a plurality of waist stretches in the stretched state along the width direction of the diaper on the skin contact surface side with respect to the stretchable member joining region 111b located closer to the crotch part 103 than the cushion forming region 111a of the outer seat 111 Fixing the member 114;
By folding back the cushion formation region 111a of the outer sheet 111 toward the skin contact surface side, the waist stretches between the first cushion formation sheet 112 and the second cushion formation sheet 113 and the elastic member joining region 11b. A step of sandwiching the member 114 is performed to manufacture a disposable diaper having a flute structure.
In the “intermittent bonding process”, the bonding apparatus according to the first embodiment is used.
That is, the joining device is
Embossing roll 1,
Bonding means 2, 3 selected from ultrasonic seal horn or heat seal roll,
Hugging angle forming means 4,
Tension applying means 5.
Embossing roll 1
A cylindrical roll body 10 having a rotation axis perpendicular to the traveling direction of the outer sheet 111 in a plane;
The first pattern block 11 provided on the outer peripheral surface of the roll main body 10 at a position that contacts the portion including the overlapping portion of the outer sheet 111 and the first cushion forming sheet 112, and the outer sheet 111 and the second cushion forming sheet. And a second pattern block 12 provided at a position in contact with a portion including the overlapping portion 113.
Adhesive means 2, 3
It is provided at a position facing the first pattern block 11 and the second pattern block 12,
By sandwiching the outer sheet 111 and the first cushion forming sheet 112 between the first pattern block 11, both are joined, and
The outer sheet 111 and the second cushion forming sheet 113 are sandwiched between the second pattern block 12 to join them together.
The holding angle forming means 4
An upstream guide roll 41 that is provided on the apparatus upstream side of the embossing roll 1 and travels the sheets 111 to 113 of the outer sheet 111, the first cushion forming sheet 112, and the second cushion forming sheet 113;
A downstream guide roll 42 that is provided on the apparatus downstream side of the embossing roll 1 and travels the sheets 111 to 113.
The upstream guide roll 41 and the downstream guide roll 42 are
The sheets 111 to 113 are arranged on the apparatus upstream side and the apparatus downstream side of the embossing roll 1 so as to form a predetermined holding angle and run while contacting the first pattern block 11 and the second pattern block 12. Yes.
The tension applying means 5 is
A pair of upstream facing rolls 5a provided on the upstream side of the upstream guide roll 41 and rotating while sandwiching the sheets 111 to 113;
A pair of downstream facing rolls 5b that are provided on the downstream side of the downstream guide roll 42 and rotate with the sheets 111 to 113 interposed therebetween.

  As described above, wrinkles are formed on the two-layer sheet forming the “flute structure” by manufacturing the disposable diaper having the “flute structure” using the joining device according to the first aspect of the present invention. Therefore, a disposable diaper having a good texture can be manufactured, and a good product shipment rate of the disposable diaper is improved.

FIG. 1 is a perspective view showing an outline of a joining apparatus according to the present invention. FIG. 2 is a side view showing an outline of the joining apparatus according to the present invention. FIG. 3 is a perspective view showing an embodiment of a joining apparatus according to the present invention. FIG. 4 is a perspective view showing another embodiment of the joining device according to the present invention. FIG. 5 is a perspective view showing another embodiment of the joining device according to the present invention. FIG. 6 is a perspective view showing another embodiment of the joining device according to the present invention. FIG. 7 is a flow diagram schematically showing a method for manufacturing a disposable diaper according to the present invention. FIG. 8 is a developed view showing an example of a disposable diaper manufactured by the manufacturing method according to the present invention. FIG. 9 is a cross-sectional view showing an example of a disposable diaper manufactured by the manufacturing method according to the present invention. FIG. 10 is a perspective view for explaining the flute structure. FIG. 11 is a developed view showing another embodiment of the disposable diaper manufactured by the manufacturing method according to the present invention. FIG. 12 is a diagram for explaining a conventional joining apparatus.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments described below, and includes those appropriately modified by those skilled in the art from the following embodiments.
In the present specification, “A to B” means “A to B”.

(1. Joining device)
First, the joining apparatus according to the first aspect of the present invention will be described.
FIG. 1 is a perspective view showing an outline of a joining device 60 according to the present invention. FIG. 2 is a side view showing an outline of the joining device 60. FIG. 3 is a perspective view conceptually enlarging and showing a region (rectangular region indicated by a dotted line in FIG. 2) in the vicinity of the bonding apparatus 60 where the embossing roll and the bonding means are disposed. In FIGS. 2 and 3, orthogonal coordinates X, Y, and Z are set in order to make it easy to understand the direction in the three-dimensional space.

The joining apparatus 60 of the present invention basically includes an embossing roll 1, adhesive means 2 and 3, a hanger angle forming means 4, and a tension applying means 5.
The embossing roll 1 is provided with a block including convex portions formed in a predetermined pattern for joining the sheet members.
The adhering means 2 and 3 have a configuration in which a sheet member is sandwiched between the embossing rolls 1 and the sandwiched sheet member is adhered. The adhering means is realized by, for example, an ultrasonic horn for ultrasonic sealing or a heat roll for heat sealing. The ultrasonic seal sandwiches a thermoplastic sheet member between an ultrasonic horn that vibrates ultrasonically and an embossing roll, generates frictional heat by applying vibration to the sheet member, and uses this frictional heat to generate a sheet. Crimp while melting the member. When the ultrasonic horn is pressed against the sheet member and the vibration is sufficiently transmitted, the material is melted and the materials are fused by the pressing pressure. On the other hand, in heat sealing, a thermoplastic sheet member is sandwiched between a heated heat roll and an embossing roll, and the sheet member is heated and pressed by using heat applied by the heat roll to be pressure-bonded.
The holding angle forming means 4 has a configuration in which the traveling sheet member forms a predetermined holding angle and abuts the embossing roll.
The tension applying means 5 has a configuration for applying tension to the sheet member before and after the embossing roll 1 and the bonding means 2 and 3 are joined.
In the embodiments of the present invention to be described below, a description will be given by taking as an example a form in which a horn for ultrasonic sealing is adopted as the bonding means. However, as described above, as the bonding means of the present invention, a heat-sealing heat roll and a known one can be adopted.

  As shown in FIGS. 1 and 2, the joining device 60 according to an embodiment of the present invention includes an embossing roll 1, a first horn 2, a second horn 3, and a plurality of guide rolls 4. ing. Furthermore, the joining device 60 has a pair of upstream opposing rolls 5a and a pair of downstream opposing rolls 5b on the upstream side and the downstream side of the embossing roll 1, respectively.

  As shown in FIG. 1, the joining device 60 of the present invention joins the second sheet S2 and the third sheet S3 to the first sheet S1. Each sheet is preferably a sheet member such as a plastic film or a nonwoven fabric formed of a thermoplastic resin or the like. The first sheet S1, the second sheet S2, and the third sheet S3 are long, and are conveyed in the longitudinal direction by the embossing roll 1 and the plurality of guide rolls 4. The joining device 60 of the present invention joins a part of the second sheet S2 to one end portion in the width direction of the first sheet S1, and joins a part of the third sheet S3 to the other end portion in the width direction of the first sheet S1. be able to. The first sheet S1, the second sheet S2, and the third sheet S3 may be originally separated sheet members, or may be obtained by dividing one sheet member into three sheets. .

  First, the first sheet S1, the second sheet S2, and the third sheet S3 are fed out from a raw roll (not shown). The sheets S1, S2, and S3 fed out from the original roll are superposed on a pair of upstream facing rolls 5a located on the upstream side of the apparatus. The upstream facing roll 5 a includes a feed roll 51 and a bonding roll 52. The feed roll 51 and the bonding roll 52 are disposed to face each other, and the first sheet S1, the second sheet S2, and the third sheet S3 can be sandwiched therebetween. Thereby, in the upstream opposing roll 5a on the upstream side of the apparatus, the second sheet S2 and the third sheet S3 are overlapped with each of both end portions in the width direction of the first sheet S1. Here, the rotation axis of the feed roll 51 is interlocked with a motor (not shown). For this reason, the feed roll 51 can be rotationally driven in conjunction with the rotation of the motor. That is, the feed roll 51 is a drive roll. On the other hand, the bonding roll 52 rotates in conjunction with the rotation of the feed roll 51. The bonding roll 52 does not need to be interlocked with the motor. That is, the bonding roll 52 is a driven roll. The feed roll 51 and the bonding roll 52 may be rubber rubber rolls or metal steel rolls. At least the bonding roll 52 is preferably a rubber roll.

  The sheets S1, S2, and S3 overlapped by the upstream facing roll 5a are conveyed toward the embossing roll 1 while maintaining the overlapping state. An upstream guide roll 41 is located on the upstream side of the embossing roll 1 and a downstream guide roll 42 is located on the downstream side of the embossing roll 1. Each sheet S1, S2, S3 is guided between the embossing roll 1 and the first and second horns 2, 3 while being guided by the upstream guide roll 41 and the downstream guide roll 42.

  Also, as shown in FIG. 2, each sheet S1, S2, S3 is guided by the upstream guide roll 41 and the downstream guide roll 42, thereby forming a holding angle (θ) on the embossing roll 1 and Touch. This holding angle (θ) will be described later in detail. Each sheet S 1, S 2, S 3 is introduced between the embossing roll 1 and the first and second horns 2, 3 in a state where it forms a holding angle with the embossing roll 1. And the 1st and 2nd horns 2 and 3 give heat with respect to each sheet | seat S1, S2, S3 by ultrasonic vibration, and fuse | melt each sheet | seat.

  When the joined sheets S1, S2, S3 are discharged from between the embossing roll 1 and the first and second horns 2, 3, a pair of sheets are guided by the downstream guide roll 42 and positioned on the downstream side of the apparatus. It is introduced between the downstream facing rolls 5b. The downstream facing roll 5 b includes a feed roll 53 and a bonding roll 54. The feed roll 53 and the bonding roll 54 are arranged to face each other, and the joined first sheet S1, second sheet S2, and third sheet S3 can be sandwiched therebetween. Here, the rotation axis of the feed roll 53 is interlocked with a motor (not shown). For this reason, the feed roll 53 can be rotationally driven in conjunction with the rotation of the motor. That is, the feed roll 53 is a drive roll. On the other hand, the bonding roll 54 rotates in conjunction with the rotation of the feed roll 53. The bonding roll 54 does not need to be interlocked with the motor. That is, the bonding roll 54 is a driven roll. The feed roll 53 and the bonding roll 54 may be rubber rubber rolls or metal steel rolls. At least the bonding roll 54 is preferably a rubber roll.

  Here, as shown in FIG. 2, in the joining device 60 of the present invention, the sheets S1, S2, and S3 are sandwiched by the upstream facing roll 5a and the downstream facing roll 5b, respectively, so that these sheets are sandwiched. A certain tension is applied. That is, the wrinkles generated in the sheets S1 to S3 can be stretched by sandwiching and pulling the sheets S1 to S3 before and after the embossing roll 1. Thus, by arranging the upstream facing roll 5a and the downstream facing roll 5b before and after the embossing roll 1, the sheets S1 to S3 are introduced between the embossing roll 1 and the first and second horns 2,3. When a proper tension is applied, a proper tension is applied. Accordingly, the sheets S1 to S3 are joined by the embossing roll 1 and the first and second horns 2 and 3 in a state where tension is applied. Thereby, it becomes possible to join each sheet | seat S1-S3 without a wrinkle.

  As shown in FIG. 2, no other roll device is disposed between the upstream facing roll 5 a and the upstream guide roll 41. Further, no other roll device is disposed between the downstream facing roll 5 b and the downstream guide roll 42. In this way, no other roll device is interposed between the opposing rolls 5a and 5b for applying tension and the guide rolls 41 and 42 for forming a holding angle. Thereby, when conveying with another roll apparatus, it can prevent that wrinkles generate | occur | produce in each sheet | seat S1-S3.

  Moreover, in FIG. 2, the point (1st point) which the upstream opposing roll 5a pinches | interposes each sheet | seat S1-S3 is shown with the code | symbol P1. Moreover, the point (2nd point) where the downstream opposing roll 5b pinches | interposes each sheet | seat S1-S3 is shown with the code | symbol P2. Further, the point (third point) where the upstream guide roll 41 and each of the sheets S1 to S3 come into contact is indicated by reference numeral P3. Further, a point (fourth point) where the downstream guide roll 42 and the sheets S1 to S3 abut is indicated by a symbol P4. Further, the point (fifth point) at which the embossing roll 1 and the first and second horns 2 and 3 sandwich the sheets S1 to S3 is indicated by reference numeral P5.

Here, as shown in FIG. 2, when the joining device 60 is viewed from the side, it is divided into the embossing roll 1 side (right side in the figure) and the bonding means 2, 3 side (left side in the figure). The point (P1) and the second point (P2) are located closer to the bonding means 2 and 3 (left side in the drawing) than the third point (P3) and the fourth point (P4). Thereby, each sheet | seat S1-S3 which connects a 1st point (P1) and a 3rd point (P3) becomes a substantially S shape, and each sheet | seat S1- which connects a 2nd point (P2) and a 4th point (P4). S3 is also substantially S-shaped.
Further, as shown in FIG. 2, when the joining device 60 is viewed from the side, the fifth point (P5) is located on the straight line connecting the first point (P1) and the second point (P2). ing. Thereby, as FIG. 2 shows, the conveyance path | route of each sheet | seat S1-S3 becomes a wave shape.

  Thus, by setting the positions of the first point (P1), the second point (P2), the third point (P3), the fourth point (P4), and the fifth point (P5), each sheet S <b> 1 to S <b> 3 are conveyed in contact with the circumferential surface of the embossing roll 1 so as to form a holding angle while having an appropriate tension. Thereby, it becomes possible to join each sheet | seat S1-S3 beautifully without wrinkles.

  Further, for example, in order to apply appropriate tension to each of the sheets S1 to S3, the conveyance speed (R1) by the embossing roll 1 and the conveyance speed (R2) by the feed roll 51 constituting the upstream facing roll 5a, It is also possible to adjust the conveyance speed (R3) by the feed roll 53 constituting the downstream facing roll 5b. The conveyance speed here is determined by the length of the sheet member that can be conveyed per unit time (m / min). For example, it is preferable that the conveyance speed (R3) of the feed roll 53 is faster than the conveyance speed (R1) of the embossing roll 1 and the conveyance speed (R2) of the feed roll 51 (R3> R1, R2). In addition, it is preferable that the conveyance speed (R1) of the embossing roll 1 and the conveyance speed (R2) of the feed roll 51 are substantially equal. (R3> R1 = R2). In this way, the conveyance speed (R3) of the feed roll 53 is faster than the conveyance speed (R1) of the embossing roll 1 and the conveyance speed (R2) of the feed roll 51, so that the sheets S1 to S3 are fed by the feed roll 53. Is pulled, and appropriate tension is applied. For example, the conveyance speed (R3) of the feed roll 53 is 0.1 to 10 m / min, 0.5 to 8 m / min than the conveyance speed (R1) of the embossing roll 1 and the conveyance speed (R2) of the feed roll 51. Or about 1 to 5 m / min.

Next, the configuration of the embossing roll 1 will be described in detail.
As shown in FIG. 3, the embossing roll 1 includes a roll body 10 having a circular cross section having a rotation axis. The rotation axis of the roll body 10 is parallel to the Y axis shown in FIG. The roll body 10 rotates according to this rotation axis. The roll body 10 is in contact with the surfaces of the sheets S1, S2, and S3 with the Z direction as the long direction and the Y direction as the short direction. Moreover, it is preferable that the length of the roll body 10 in the axial direction exceeds the overall width in a state where the sheets S1, S2, and S3 are overlapped. The roll body 10 is rotated by a driving means (not shown) and conveys the sheets S1, S2, and S3 in the direction of the arrow shown in FIG.

  A first pattern block 11 and a second pattern block 12 are provided on the outer peripheral surface of the roll body 10. The first pattern block 11 and the second pattern block 12 share the rotation axis with the roll main body 10 and are formed in a circular column shape with a circular cross section like the roll main body 10. As shown in FIGS. 2 and 3, the first pattern block 11 and the second pattern block 12 have a predetermined thickness and are formed one step higher than the outer peripheral surface of the roll body 10. For example, the first pattern block 11 and the second pattern block 12 have a step height of about 1 mm to 20 mm, or about 5 mm to 10 mm. The 1st pattern block 11 is provided in the outer peripheral surface of the roll main body 10, and the position contact | abutted to the overlapping location (C1) of 1st sheet | seat S1 and 2nd sheet | seat S2. The width of the first pattern block 11 may be narrower than the width of the overlapping portion (C1), but is preferably wide. Moreover, the 2nd pattern block 12 is provided in the outer peripheral surface of the roll main body 10, and the position which contact | abuts the overlap location (C2) of 1st sheet | seat S1 and 3rd sheet | seat S3. The width of the second pattern block 12 may be narrower than the width of the overlapping portion (C2), but is preferably wide.

  As shown in FIG. 3, the first pattern block 11 and the second pattern block 12 are not provided at both ends in the axial direction of the roll body 10, and are provided to the inner side in the axial direction to some extent. For this reason, the roll body 10 is positioned on the inner side 10a positioned on the inner side in the axial direction than the first pattern block 11 and the second pattern block 12, and on the outer side in the axial direction than the first pattern block 11 and the second pattern block 12. It has an outer portion 10b. The length in the axial direction of the inner part 10a in the roll body 10 and the length in the axial direction of the outer part 10b are the widths of the first sheet S1, the second sheet S2, and the third sheet S3, and the first sheet S1. What is necessary is just to set suitably according to the position which joins 2 sheet | seat S2 and 3rd sheet | seat S3. Basically, it is preferable that the length of the roll body 10 in the axial direction exceeds the overall width of the stacked sheets S1, S2, and S3.

  As shown in FIG. 3, a plurality of convex portions 11a and 12a are formed on the outer peripheral surfaces of the first pattern block 11 and the second pattern block 12, respectively. The plurality of convex portions 11a and 12a are provided in accordance with a desired pattern for joining the second sheet S2 and the third sheet S3 to the first sheet S1. In the present invention, the second sheet S2 and the third sheet S3 are intermittently joined to the first sheet S1 so that the joining part and the non-joining part are continuous along the flow direction of each sheet. Therefore, a plurality of convex portions 11 a and 12 a are intermittently provided on the outer peripheral surfaces of the first pattern block 11 and the second pattern block 12 with a predetermined interval in the rotation direction of the roll body 10. It is preferable that the space | interval of adjacent convex part 11a, 12a is equal, and it is preferable that several convex part 11a, 12a forms the regular pattern. The plurality of convex portions 11 a and 12 a are formed one step higher than the outer peripheral surfaces of the first pattern block 11 and the second pattern block 12. For example, the step height of each of the convex portions 11a and 12a is preferably about 0.5 mm to 5 mm and 1 mm to 3 mm. In addition, the pattern in which the some convex part 11a, 12a is formed is not limited to what was illustrated. For example, the plurality of convex portions 11 a and 12 a may be provided at predetermined intervals in the rotation direction and the axial direction of the roll body 10. Further, the plurality of convex portions 11a and 12a are not limited to a linear shape, and may be formed in a dot shape, for example. For example, a plurality of dot-like convex portions 11 a and 12 a form a row along the axial direction of the roll body 10, and this row of convex portions is intermittently spaced at a predetermined interval in the rotation direction of the roll body 10. It may be provided.

  On the other hand, as shown in FIG. 3, the first horn 2 is disposed at a position facing the first pattern block 11, and the second horn 3 is disposed at a position facing the second pattern block 12. The 1st horn 2 is the 1st pattern block 11 so that the overlap part (C1) of the 1st sheet S1 and the 2nd sheet S2 can be inserted between the 1st pattern block 11 (especially convex part 11a). It is arranged close to. Similarly, the 2nd horn 3 is 2nd so that the overlapping location (C2) of 1st sheet | seat S1 and 3rd sheet | seat S3 can be pinched | interposed between 2nd pattern blocks 12 (especially convex part 12a). It is arranged close to the pattern block 12. The pattern blocks 11 and 12 and the horns 2 and 3 may be close to each other so that their outer surfaces are in contact with each other. The pattern blocks 11 and 12 and the horns 2 and 3 may be close enough to be separated by a distance of 2T or less when the thickness of the superimposed sheets is 2T.

  The 1st horn 2 and the 2nd horn 3 generate | occur | produce friction heat with respect to the sheet | seat by pinching | stacking the overlapping sheet | seat between the 1st pattern block 11 and the 2nd pattern block 12, and the overlapping sheet | seat is produced | generated. Weld. For this reason, it is preferable that the 1st horn and the 2nd horns 2 and 3 are ultrasonic horns which provide frictional heat to the sheet by ultrasonic vibration. In this specification, the case where the first horn 2 and the second horn 3 are ultrasonic horns will be described as an example.

  The ultrasonic horn sandwiches the sheet between the convex portions 11a and 12a provided on the pattern blocks 11 and 12, and welds the sheet using frictional heat generated by ultrasonic vibration. For this reason, the ultrasonic horn can locally apply heat to the sandwiched portion. Therefore, the ultrasonic horn does not need to apply extra heat to the sheets as compared with the heating horn that generates heat, and thus is suitable for applications in which the sheets are joined at fine intermittent intervals. However, since the ultrasonic horn itself vibrates ultrasonically, when sandwiching and joining the sheets, the sheets are likely to be twisted or distorted, and as a result, the joined sheets are likely to be wrinkled. There is a problem. In this respect, the present invention can eliminate the problem that wrinkles occur in the joining using such an ultrasonic horn, so that the advantage of the ultrasonic horn that can accurately apply heat only to the sandwiched portion can be effectively utilized. .

  The ultrasonic horns 2 and 3 are connected to, for example, horn portions 21 and 31 having contact surfaces that contact a friction target sheet, a booster portion (not shown) connected to the horn portions 21 and 31, and a booster portion. Converter unit (not shown). The converter unit converts the high-frequency electric signal into mechanical vibration and conducts it to the booster unit. The booster unit increases or decreases the vibration generated by the converter unit, and causes the horn units 21 and 31 to ultrasonically vibrate. The horn parts 21 and 31 vibrate in resonance with the ultrasonic vibrations of the converter part and the booster part, and apply vibration energy to the friction target sheet from the contact surface to generate frictional heat. The contact surface of the ultrasonic horn is preferably a flat surface. The contact surfaces of the horn portions 21 and 31 face the outer peripheral surfaces of the pattern blocks 11 and 12, and contact the sheet from the X-axis direction.

  Further, the positions of the ultrasonic horns 2 and 3 can be appropriately adjusted according to the positions of the pattern blocks 11 and 12 provided on the embossing roll 1. That is, it is preferable that a slide mechanism is provided on a stand (not shown) that supports the ultrasonic horns 2 and 3 so that the interval between the ultrasonic horns 2 and 3 can be adjusted as appropriate.

  2 and 3, the first sheet S1, the second sheet S2, and the third sheet S3 are in contact with the embossing roll 1 so as to form a predetermined holding angle. And the 1st horn 2 and the 2nd horn 3 are clamping the part in which each sheet | seat S1, S2, S3 formed the holding angle between the embossing rolls 1. The “holding angle” here is formed by an arc line from the point where each sheet S1, S2, S3 starts to contact the outer peripheral surface of the embossing roll 1 to the point where the outer peripheral surface of the embossing roll is about to leave. The center angle is indicated by the angle θ in FIG. Specifically, the holding angle θ at which the sheets S1, S2, and S3 contact the embossing roll 1 may be set to, for example, 5 degrees to 180 degrees, preferably 20 degrees to 90 degrees.

  As described above, in order for the sheets S1, S2, and S3 to form a holding angle and come into contact with the embossing roll 1, the embossing roll 1 and the upstream guide roll 41 located upstream of the embossing roll 1 in the apparatus. And the relative position of the downstream guide roll 42 located downstream of the embossing roll 1 may be adjusted. For example, as shown in FIG. 2, the upstream guide roll 41 and the downstream guide roll 42 are formed from a surface (back surface) opposite to the surface (front surface) of each sheet S1, S2, S3 with which the embossing roll 1 abuts. Each sheet S1, S2, S3 is pressed and tension is applied. Further, as shown in FIG. 2, the point where the upstream guide roll 41 and the downstream guide roll 42 abut on the sheets S1, S2, S3 is that the embossing roll 1 and the horns 2, 3 are each of the sheets S1, S2, S3. It is located in the negative direction of the X axis from the point of contact. In this manner, by adjusting the relative positions of the embossing roll 1, the upstream guide roll 41, and the downstream guide roll 42, desired holding angles can be formed on the sheets S1, S2, and S3.

  Thus, each sheet S1, S2, S3 forms the holding angle and contacts the embossing roll 1 so that each sheet S1, S2, S3 is the first and second pattern blocks 11, 12 of the embossing roll 1. In other points as well, it comes into contact with the roll body 10. That is, as shown in FIG. 3, the overlapping portion (C1) of the first sheet S1 and the second sheet S2 abuts on the first pattern block 11 of the embossing roll 1, and the first sheet S1 and the third sheet S3. The overlapping portion (C2) comes into contact with the second pattern block 12 of the embossing roll 1. And each sheet | seat S1, S2, S3 forms the holding angle, and the width direction center part (A) of 1st sheet | seat S1 contact | abuts to the inner side part 10a in the roll main body 10 of the embossing roll 1. FIG. Further, the surplus portion (B1) of the second sheet S2 and the surplus portion (B2) of the third sheet S3 are in contact with the outer portion 10b of the roll body 10 of the embossing roll 1. As a result, the sheets S1, S2, and S3 are conveyed while being in full contact with the roll body 10 of the embossing roll 1 and being loaded with tension. In this way, the tensile force applied to each part (A, B1, B2, C1, C2) of each sheet S1, S2, S3 by the embossing roll 1 is made uniform, so that there is a gap between each part. And misalignment is less likely to occur.

  In particular, in the present invention, as shown in FIG. 2, the distance from the outer peripheral surface of the embossing roll 1 to the outer peripheral surface of the downstream guide roll 42 is larger than the distance from the outer peripheral surface of the embossing roll 1 to the outer peripheral surface of the upstream guide roll 41. It is preferable that the distance is shorter. The convex portions 11a and 12a and the downstream guide rolls 42 in the pattern blocks 11 and 12 of the embossing roll 1 may be close to each other so that the surfaces come into contact with each other. Further, the convex portions 11a and 12a and the downstream guide roll 42 in each pattern block 11 and 12 of the embossing roll 1 are close enough to be separated by a distance of 2T or less when the thickness of the overlapped sheet is 2T. May be. In this way, by arranging the downstream guide roll 42 close to the embossing roll 1, the sheets S 1, S 2, S 3 are welded, and then the sheets S 1, S 2, S 3 are immediately pressed by the downstream guide roll 42. Therefore, the bonding strength of the sheets S1, S2, and S3 is improved, and a situation in which wrinkles are generated at the bonded portion can be more effectively prevented.

  Further, in the present invention, as shown in FIG. 3, an outer sheet conveying block 13 is provided on the outer peripheral surface of the outer portion 10 b of the roll body 10 in the embossing roll 1. Further, an inner sheet conveyance block 14 is provided on the outer peripheral surface of the inner portion 10 a of the roll body 10 in the embossing roll 1. The outer sheet conveying block 13 and the inner sheet conveying block 14 share a rotating shaft with the roll body 10 and are formed in a circular column shape with a circular cross section, like the roll body 10. In the example shown in FIG. 3, the outer peripheral surfaces of the outer sheet conveying block 13 and the inner sheet conveying block 14 form a smooth surface. As shown in FIG. 3, the outer sheet conveying block 13 and the inner sheet conveying block 14 have a predetermined thickness and are formed one step higher than the outer peripheral surface of the roll body 10. The step heights of the outer sheet conveying block 13 and the inner sheet conveying block 14 are preferably substantially the same as those of the first pattern block 11 and the second pattern block 12 described above. That is, the step heights of the outer sheet transport block 13 and the inner sheet transport block 14 are preferably within ± 5% of the step heights of the first pattern block 11 and the second pattern block 12.

Further, as shown in FIG. 3, the outer sheet conveying block 13 provided in the vicinity of both ends of the embossing roll 1 corresponds to the surplus portion B1 of the second sheet S2 and the surplus portion (B2) of the third sheet S3. It is provided at the position where it touches. The width of the outer sheet conveying block 13 may be narrower than the width of the surplus portions (B1, B2) of the second sheet S2 and the third sheet S3, but is preferably wide.
As shown in FIG. 3, the inner sheet conveying block 14 provided in the vicinity of the center of the embossing roll 1 is provided at a position in contact with the central portion (A) in the width direction of the first sheet S1. The width of the inner sheet conveying block 14 is preferably narrower than the width of the central portion (A) in the width direction of the first sheet S1.
The outer sheet conveying block 13 and the inner sheet conveying block 14 are not necessarily provided. For example, only the outer sheet conveying block 13 may be provided, or only the inner sheet conveying block 14 may be provided. It is good as well.

  It is preferable that the sheet conveying blocks 13 and 14 have the same height as the pattern blocks 11 and 12. When the sheet conveying blocks 13 and 14 are in contact with the sheet at the same height as the pattern blocks 11 and 12, the sheet is less likely to wrinkle. Depending on the sheet weight, stiffness, slipperiness and width shrinkage, the ease of slippage and the ease of wrinkling also change, so the sheet conveying blocks 13 and 14 are subjected to surface treatment to increase the frictional force. The sheet may be easily held by providing a suction hole for sucking the sheet. Conversely, the surface may be smoothed in order to improve slippage. The pattern blocks 11 and 12 are not necessarily provided on the same axis. Further, the sheet conveying blocks 13 and 14 are not necessarily provided on the same axis. For example, the sheet conveying blocks 13 and 14 can be replaced with fixed blocks or guide plates. Thus, by making the pattern blocks 11, 12 and the like flexible, the capital investment can be made inexpensive.

  When heat sealing is selected as the bonding means, it is necessary to heat the embossing roll and the heat sealing roll to near the melting point of the sheet. At that time, the embossing roll is preferably at a lower temperature than the heat seal roll. By doing so, it is possible to prevent the sheet from being partially melted or hardened. In this case, it is preferable that the sheet conveying blocks 13 and 14 are thermally shielded from the heat seal roll main body so as not to be heated. For example, a suction hole for sucking a sheet may be provided, and the temperature of the sheet conveying blocks 13 and 14 may be kept lower than the temperature of the heat seal roll body by sucking air. On the other hand, in the case of ultrasonic sealing, in order to accurately maintain the clearance between the ultrasonic sealing horn and the embossing roll, the embossing roll can be adjusted to a temperature of 50 to 90 ° C. to prevent a change in the outer diameter due to thermal expansion. preferable.

  As described above, at least one of the first sheet S1, the second sheet S2, and the third sheet S3 overlaps either or one of the outer sheet conveyance block 13 and the inner sheet conveyance block 14, A suction hole (not shown) may be provided. The suction holes provided in the outer sheet transport block 13 or the inner sheet transport block 14 are connected to a known suction device. For this reason, each sheet which contacts the suction hole of the outer sheet conveying block 13 or the inner sheet conveying block 14 is conveyed while being sucked by these blocks. Accordingly, it is possible to convey the sheet by extending the wrinkles generated on each sheet.

FIG. 4 is a perspective view showing a preferred embodiment of the joining device according to the present invention. In the form shown in FIG. 4, a plurality of convex portions 13 a and 14 a are formed on the outer peripheral surfaces of the outer sheet conveying block 13 and the inner sheet conveying block 14. The configuration shown in FIG. 4 has the same configuration as that shown in FIG. 3 in other respects.
The convex portions 13a and 14a provided in the outer sheet conveying block 13 and the inner sheet conveying block 14 are the same pattern as the patterns of the convex portions 11a and 12a provided in the first pattern block 11 and the second pattern block 12. It is preferable to be provided. That is, the plurality of convex portions 13a and 14a of the outer sheet conveying block 13 and the inner sheet conveying block 14 have the same number, step height, and distance between the adjacent convex portions as the first pattern block 11 and the first convex portion 13a. It is preferable that they are the same as the plurality of convex portions 11a, 12a of the two-pattern block 12. By doing in this way, the tensile force provided with respect to each part (A, B1, B2, C1, C2) of each sheet | seat S1, S2, S3 by the embossing roll 1 is further equalized.

  FIG. 5 is a perspective view showing another embodiment of the joining device according to the present invention. In the form shown in FIG. 5, the first pattern block 11, the second pattern block 12, the outer sheet conveying block 13, and the inner sheet conveying block 14 are all connected. The first pattern block 11, the second pattern block 12, the outer sheet conveying block 13, and the inner sheet conveying block 14 have the same height. The first pattern block 11, the second pattern block 12, the outer sheet conveying block 13, and the inner sheet conveying block 14 are respectively provided with convex portions 11a, 12a, 13a, and 14a. The heights of the steps 11a, 12a, 13a, and 14a are also equal. In other words, on the outer peripheral surface of the roll body 10 of the embossing roll 1, a block having a convex portion is formed over the entire sheet width in a state where the first sheet S1, the second sheet S2, and the third sheet S3 are overlapped. ing. The first horn 2 comes into contact with the joining range of the first sheet S1 and the second sheet S2, and the second horn 3 comes into contact with the joining range of the first sheet S1 and the second sheet S2. It has become. By configuring the embossing roll 1 as described above, the embossing roll 1 further applies a tensile force applied to each part (A, B1, B2, C1, C2) of each sheet S1, S2, S3. It can be made uniform.

However, in the form shown in FIG. 5, the first pattern block 11, the second pattern block 12, the outer sheet conveying block 13, and the inner sheet conveying block 14 are not necessarily all connected. There is no.
For example, the first pattern block 11 and the outer sheet conveying block 13 may be connected, and the second pattern block 12 and the outer sheet conveying block 13 may be connected. In this case, the first pattern block 11 and the inner sheet conveying block 14, and the second pattern block 12 and the inner sheet conveying block 14 may not be connected.
On the other hand, the first pattern block 11 and the inner sheet conveying block 14 may be connected, and the second pattern block 12 and the inner sheet conveying block 14 may be connected. In this case, the first pattern block 11 and the outer sheet conveying block 14, and the second pattern block 12 and the outer sheet conveying block 14 may not be connected.

  FIG. 6 is a perspective view showing still another embodiment of the joining device according to the present invention. In the form shown in FIG. 6, the first sheet S <b> 1 has a first sheet S <b> 1-1 on one end side where the second sheet S <b> 2 is joined and a second sheet side on the other end side where the third sheet S <b> 3 is joined. It is separated into the first-second sheet S1-2. Thus, the joining device of the present invention joins the overlapping portion of the 1-1 sheet S1-1 and the second sheet S2, and joins the overlapping portion of the 1-2 sheet S1-2 and the third sheet S3. It can also be used for the purpose of In such a case, the long sheet member fed out from one original fabric roll is cut in the vicinity of the central portion in the width direction by a cutting device or the like, and the 1-1 sheet S1-1 and the 1-2 sheet. It is good also as separating to S1-2. In addition, the 1-1 sheet S1-1 and the 1-2 sheet S1-2 may be wound around different original rolls, respectively, and may be fed out from different original rolls. .

As shown in FIG. 6, the first-first sheet S1-1 overlaps the second sheet S2 at the outer end portion (C1), and similarly, the first-second sheet S1-2 has the outer end portion (C2). In FIG.
The 1-1 sheet S1-1 and the second sheet S2 are conveyed and joined to each other so that the overlapping portion (C1) passes between the first pattern block 11 of the embossing roll 1 and the first horn 2. The At this time, the transport line is formed by the upstream guide roll 41 and the downstream guide roll 42 so that the first sheet S1-1 and the second sheet S2 form a predetermined holding angle and come into contact with the first pattern block 11. It has been adjusted. Moreover, by this, the part (A1) near the center in the width direction of the 1-1 sheet S1-1 comes into contact with the inner part 10a of the roll body 10 of the embossing roll 1. Similarly, the 1-2 sheet S1-2 and the 3rd sheet S3 are conveyed so that the overlapping portion (C2) passes between the second pattern block 12 of the embossing roll 1 and the second horn 3, Are joined together. At this time, the transport lines are formed by the upstream guide roll 41 and the downstream guide roll 42 so that the first sheet S1-2 and the third sheet S3 form a predetermined holding angle and come into contact with the second pattern block 12. It has been adjusted. Moreover, by this, the part (A2) near the center in the width direction of the first-second sheet S1-2 comes into contact with the inner part 10a of the roll body 10 of the embossing roll 1.
If it does in this way, it is a case where other sheet members (the 2nd sheet and the 3rd sheet) are intermittently joined to each of the separated sheet members (the 1-1 sheet and the 1-2 sheet). Even if it matches, it can prevent that a wrinkle arises in the junction part.

  As mentioned above, although preferable embodiment of the joining apparatus concerning this invention was described, the joining apparatus of this invention is not limited to this. For example, as the means (holding angle forming means) for the first sheet S1, the second sheet S2, and the third sheet S3 to form a holding angle and come into contact with the embossing roll 10, an upstream guide roll 41 and a downstream guide roll 42 are used. Instead of this, a conveyor, a guide plate, a guide belt, or the like may be employed. A conveyor, a guide plate, a guide belt, or the like adjusts a pass line on which the first sheet S1, the second sheet S2, and the third sheet S3 travel, and sets these sheets S1, S2, and S3 at a predetermined holding angle. It is formed and brought into contact with the embossing roll 10. Further, for example, suction means may be provided on the surface of the guide roll, conveyor, guide plate, or guide belt that contacts the sheet. The suction means is means for sucking a sheet that comes into contact with the guide roll or the like so that the traveling sheet does not deviate from the guide roll or the like.

(2. Manufacturing method of disposable diapers)
Then, the manufacturing method of the disposable diaper using the said joining apparatus 60 is demonstrated.
The production method of the present invention can be widely applied to known pant-type disposable diapers and methods for producing tape-type disposable diapers. A pants-type disposable diaper is a disposable diaper of a type in which both sides of a front body and a back body are joined in advance. As the pants-type disposable diaper, the outer body on which the absorbent main body is placed may be an integrated body that is hung from the front body to the back body, and the exterior body is the front body and the back body. And a crosslinked type in which the absorbent main body is crosslinked between the front body exterior body and the back body exterior body. The tape-type disposable diaper is a type of disposable diaper in which an adhesive tape is attached to both sides of the front body or the back body, and the front body and the back body are bonded using the adhesive tape when worn. In the following, among these various types of disposable diapers, an example of an integrated pants-type disposable diaper in which the outer body is integrated from the front body to the back body will be specifically described. explain.
In the following description, for example, the expression “original outer sheet” is used. However, the “original outer sheet” and the like are later cut into a disposable diaper production line to become an outer sheet of the disposable diaper later. Means a member.

FIG. 7: is the conceptual diagram which showed the manufacturing process of the disposable diaper which concerns on this invention. In FIG. 7, the direction shown by the arrow A is the flow direction of the diaper manufacturing process.
In the production method of the present invention, first, the original outer sheet 111 is unwound from an unillustrated original fabric roll and introduced into a diaper production line (step S1). In the original outer sheet 111, the direction along the flow direction of the manufacturing process is the longitudinal direction, and the direction orthogonal to the flow direction of the manufacturing process is the width direction. One end side in the width direction of the original outer sheet 111 corresponds to the front body side of the manufactured disposable diaper, and the other end side in the width direction corresponds to the back body side of the manufactured disposable diaper.

  On the original outer sheet 111 (skin contact surface side), the original first cushion forming sheet 112 is overlapped with the end portion on the front body side, and the original second cushion forming sheet 113 is overlapped with the end portion on the rear body side. (Step S2). That is, the region where the original outer sheet 111 and the original cushion forming sheets 112 and 113 overlap is located at both end portions in the width direction of the original outer sheet 111. The area of the original outer sheet 111 where the original cushion forming sheets 112 and 113 overlap is referred to as a cushion forming area 111a. Each of the original cushion forming sheets 112 and 113 is, for example, drawn out from one original fabric roll, and then, by a slitter, the original first cushion forming sheet 112 on the front body side and the second cushion forming sheet 113 on the original back body side are used. It may be divided and overlapped with each of the front body side and the back body side ends of the original outer sheet 111. Each of the original cushion forming sheets 112 and 113 is fed out from two original rolls that separately wind the original first cushion forming sheet 112 on the front body side and the original second cushion forming sheet 113 on the rear body side. In addition, it may be superimposed on each of the front body side and the back body side ends of the original outer sheet 111.

  Then, in this embodiment, the process of joining the original outer sheet | seat 111 and each original cushion formation sheet 112, 113 intermittently is performed (step S3). As shown in FIG. 7, the original outer sheet 111 and the original cushion forming sheets 112 and 113 are joined by intermittently forming a plurality of joining portions 121 along the sheet flow direction. Further, in the present embodiment, the plurality of joining portions 121 are slightly longer from the region in which the original outer sheet 111 and the respective original cushion forming sheets 112 and 11 overlap to the center in the width direction of the original outer sheet 111. It extends, and the end portion of the joining portion 121 is aligned on the straight line on the outer sheet 111. For this reason, the original outer sheet 111 and the original cushion forming sheets 112 and 11 also function as folded portions provided on the original outer sheet 111.

  In the intermittent joining step, the joining device 60 according to the first aspect of the present invention is used. That is, in the drawings shown in FIGS. 1 to 3, “first sheet S1” corresponds to the original outer sheet 111, “second sheet S2” corresponds to the original first cushion forming sheet 112, and “third sheet” “S3” corresponds to the original second cushion forming sheet 113. That is, the original outer sheet 111, the original first cushion forming sheet 112, and the original second cushion forming sheet 113 are introduced between the embossing roll 1 and the first and second horns 2 and 3 while maintaining the overlapping state. The original outer sheet 111, the original first cushion forming sheet 112, and the original second cushion forming sheet 113 form a predetermined holding angle and come into contact with the outer peripheral surface of the embossing roll 1. The overlapping portion of the original outer sheet 111 and the original first cushion forming sheet 112 is sandwiched between the first pattern block 11 and the first horn 2 of the embossing roll 1, and follows the pattern of the convex portion 11 a formed on the first pattern block 11. It is welded intermittently. Similarly, the overlapping portion of the original outer sheet 111 and the original second cushion forming sheet 113 is sandwiched between the second pattern block 12 and the second horn 3 of the embossing roll 1 and is formed on the second pattern block 12. It is intermittently welded according to the pattern 12a.

  After the step of intermittently joining the original outer sheet 111 and the original cushion forming sheets 112 and 113 (step S3), a plurality of original tammy stretchable members 116 are formed on the original outer sheet 111 (skin contact surface side). For example, it is fixed by a hot melt adhesive or the like (step S4). At this time, the plurality of original tammy expansion / contraction members 116 are fixed to the front body side and the back body side of the original outer sheet 111 in an extended state in a direction that matches the flow of the original outer sheet 111. It is preferable that the hot-melt adhesive is directly applied to the original Tammy stretchable member 116 by a method such as a comb gun. Further, the original Tammy stretchable member 116 is cut and partially discontinuous in step S8 described later. For this reason, when joining the original Tammy stretchable member 116, an adhesive is used so that the joined portion and the non-joined portion are alternately continued so that the original Tammy stretchable member 116 can be partially discontinuous. It is preferable to apply.

  Thereafter, on the original outer sheet 111 (skin contact surface side), a plurality of original leg elastic members 118 are fixed by, for example, a hot melt adhesive or the like (step S5). The original leg elastic member 118 is fixed in an expanded state so as to meander on the front body side and the back body side of the original outer sheet 111. The original leg elastic member 118 is preferably directly coated with a hot melt adhesive by a technique such as a comb gun. Since the original leg elastic member 118 is cut and partially discontinuous in step S8, which will be described later, in the same manner as the original tammy elastic member 116, when the original leg elastic member 118 is joined, It is preferable to apply the adhesive so that the non-bonded portions are alternately continued.

  Thereafter, on the original outer sheet 111 (skin contact surface side), a plurality of original waist elastic members 114 are arranged along the sheet flow direction at positions corresponding to the waist ends of the front body side and the back body side. Joining is performed in an extended state (step S6). That is, as shown in FIG. 7, the plurality of original waist elastic members 114 are regions between the original tammy elastic members 116 and the original cushion forming sheets 112 and 113 on the front body side and the back body side. Fixed to. The region where the original waist elastic member 114 is disposed corresponds to the elastic member joining region 111b. The raw waist elastic member 114 is preferably directly coated with a hot melt adhesive by a technique such as a comb gun, for example.

  Thereafter, the original inner sheet 115 fed from an unillustrated original roll is bonded onto the original tammy elastic member 116 and the original leg elastic member 118 fixed to the original outer sheet 111 (step S7). In addition, at this time, the original inner sheet 115 may be laminated and overlapped with some of the plurality of waist elastic members 114. The original inner sheet 115 is narrower than the original outer sheet 111 and is bonded around the central portion in the width direction of the original outer sheet 111. The original inner sheet 115 is preferably joined around the center in the width direction of the original outer sheet 111 in a state where the hot melt adhesive is applied to the entire surface by a technique such as curtain spray.

  Thereafter, the original tammy expansion / contraction member 116 and the original leg expansion / contraction member 118 are cut in a direction orthogonal to the sheet flow direction while being sandwiched between the original outer sheet 111 and the original inner sheet 115 (step S8). As described above, the original Tammy elastic member 116 and the original leg elastic member 118 are sandwiched and fixed between the original outer sheet 111 and the original inner sheet 115 so that the joined portions and the non-joined portions are alternately continued. By cutting the non-joining portion, the non-joining portion becomes discontinuous.

  Then, the absorptive main body 130 is bonded on the original inner sheet 115 (skin contact surface side) (step S9). The absorptive main body 130 is bonded to a region where the original Tammy elastic member 116 and the original leg elastic member 118 are discontinuous. Although illustration of the process of forming the absorptive main body 130 is omitted, it may be formed by a known process. The absorbent main body 130 may be bonded using, for example, a hot melt adhesive. The absorbent main body 130 has, for example, a liquid-permeable top sheet on the skin contact surface side, a liquid-impermeable back sheet on the skin non-contact surface side, and between the top sheet and the back sheet. An absorber is provided. And as for the absorptive main body 130, the back seat | sheet side is bonded on the original inner sheet | seat 115. FIG.

Then, the leg outer opening 106 is formed by cutting and cutting the original outer sheet 111 and the original inner sheet 115 (step S10).
The original exterior body sheet 110 for holding the absorbent main body 130 is obtained through the above steps.

  Thereafter, the original cushion forming sheet 111 in which the original cushion forming sheets 112 and 113 are intermittently joined is folded back inward in the width direction of the seat along a straight line (fold line F) in which the plurality of joining portions 121 are arranged. A process is performed (step S11). For example, a pair of sailors for folding back both end portions of the original outer sheet 111 in the width direction are positioned on both ends of the original outer sheet 111 in the width direction. The pair of sailors folds the sheet both end portions inwardly in the width direction while sandwiching both end portions of the original outer sheet 111 to which the respective original cushion forming sheets 112 and 113 are joined. Accordingly, the plurality of original waist elastic members 114 are sandwiched and fixed between the original outer sheet 111 and the respective original cushion forming sheets 112 and 113. At this time, for joining the original cushion forming sheets 112 and 113 and the original waist elastic member 114, the hot melt adhesive applied to the original waist elastic member 114 in step S6 may be used. The hot melt adhesive may be applied again to the sheets 112 and 113 or the original waist elastic member 114.

  Thereafter, the front body of the original exterior body sheet 110 is folded back at the crotch and overlapped with the back body (step S12).

  Then, the side seal 107 is formed along the direction orthogonal to the flow direction of the sheet at the position corresponding to the side flaps of the front and rear bodies of the original exterior body sheet 110 (step S13). At this time, the side seals 107 are formed in two rows along a direction orthogonal to the sheet flow direction. The side seal 107 may be applied using, for example, a known heat embossing device or ultrasonic embossing device.

Thereafter, between the side seals 107 formed in two rows, the original exterior body sheet 110 is cut in a direction orthogonal to the sheet flow direction (step S14). Thereby, the continuous body of the disposable diaper which adjoined along the flow direction of a sheet | seat can be cut | disconnected to the individual disposable diaper 100. FIG.
Through the above steps, a pants-type disposable diaper of the type in which the exterior body is integrated from the front body to the back body can be manufactured.

  As described above, according to the manufacturing method of the present invention, the first cushion forming sheet 112 is intermittently joined to the front body side end of the outer sheet 111, and the rear body side end of the outer sheet 111 is formed. The second cushion-forming sheet 113 is intermittently joined to the disposable diaper in which the waist elastic member 114 is fixed between the outer sheet 111 and the cushion-forming sheets 112 and 113. Such a configuration is also referred to as a “flute structure”. Next, the configuration of the disposable diaper having this “flute structure” will be described.

(3. Configuration of disposable diapers)
The disposable diaper 100 manufactured by the manufacturing method of the present invention has a waist gather formed at the waist end. FIG. 8 is a development view showing an example of a disposable diaper, and shows a state in which the disposable diaper is viewed from the skin contact surface side. As shown in the developed view of FIG. 8, when the disposable diaper 100 is worn, the disposable diaper 100 is applied to the front body 101 that contacts the wearer's abdomen, the back body 102 that contacts the wearer's back, and the inseam of the wearer. It is divided into the crotch part 103 to be peeled. In the disposable diaper 100, the direction connecting the front body 101 and the back body 102 is the “longitudinal direction”, and the direction orthogonal to the longitudinal direction is the “width direction”.

  As shown in FIG. 8, the disposable diaper 100 includes an exterior body 110 formed from the front body 101 to the back body 102 and an absorption body fixed to the skin contact surface side of the exterior body 110 around the crotch 103. A sex body 130 is provided. As shown in the development view of FIG. 8, the exterior body 110 has a shape in which a portion of the crotch portion 103 where both the legs of the wearer are located is cut out during wearing. The absorbent main body 130 is formed in a substantially rectangular shape extending from the front body 101 side to the back body 102 side with the crotch 103 as the center. The absorptive main body 130 is comprised by the various absorptive members for absorbing and holding excrement, such as a wearer's urine. The pants-type disposable diaper is assembled by joining the width direction both ends of the front body 101 and the back body 102 in the exterior body 110 from the unfolded state shown in FIG. In the pants-type disposable diaper 100, a waist opening is formed by the edge of the front body 1 and the edge of the back body 2 in the longitudinal direction of the diaper. Moreover, the opening part around a leg part located around a wearer's leg part at the time of mounting | wearing is formed by joining the both ends of the front body 1 and the back body 2 mutually. For this reason, the wearer can put on the pants-type disposable diaper 100 by putting both legs through the waist opening and taking out each leg from the opening around the legs.

  FIG. 9 is a cross-sectional view showing an example of a state in which the disposable diaper 100 is cut in the longitudinal direction along the line YY shown in the developed view of FIG. 8. In FIG. 9, the vertical direction is the longitudinal direction of the disposable diaper. In FIG. 9, the right side is the skin contact surface side, and the left side is the skin non-contact surface side. Normally, various sheet members constituting a disposable diaper are extremely thin, but in the cross-sectional view of FIG. 4, various sheet members are drawn with a conceptual thickness.

  The exterior body 110 of the disposable diaper 100 is a member for holding the absorbent main body 130 in a state applied to the wearer's body. As shown in FIGS. 8 and 9, the exterior body 10 basically includes an outer sheet 111, a first cushion forming sheet 112, a second cushion forming sheet 113, a plurality of waist elastic members 114, and an inner sheet. A sheet 115, a plurality of tammy elastic members 116, and a plurality of leg elastic members 118 are provided.

  The outer sheet 111 is folded back to the skin contact surface side at positions corresponding to both end edges forming the waist opening portions on the front body 101 side and the back body 102 side, and the skin contact is made with this folded portion as a boundary. The cushion formation region 111a is located on the surface side, and the elastic member joining region 111b is located on the skin non-contact surface side. A plurality of waist elastic members 113 are fixed in an extended state along the width direction of the diaper between the cushion forming region 111a and the elastic member joining region 111b. Further, the first cushion forming sheet on the front body side so that the outer seat 111 is sandwiched between the plurality of waist elastic members 113 and the cushion forming region 111a at the position where the plurality of waist elastic members 113 are disposed. 12 is joined and the 2nd cushion formation sheet is joined in the back body side. Thus, a waist gather is formed in the waist edge part near a waist opening part by shrinking in the state where a plurality of waist elastic members 113 were fixed between outer sheet 111 and each cushion formation sheet 112, 113. The

  Further, an inner sheet 115 having a length in the longitudinal direction of the diaper shorter than that of the outer sheet 11 is bonded to the skin contact surface side of the outer sheet 111. Between the outer sheet 111 and the inner sheet 115, a plurality of tammy expansion / contraction members 116 are fixed in an extended state at a position closer to the crotch part 103 of the diaper than the plurality of waist expansion / contraction members 113. The plurality of tammy stretchable members 116 are fixed in an extended state along the width direction of the diaper. When the plurality of tammy stretchable members 116 contract, tammy gathers are formed around the abdomen of the front body 101 and the back body 102. It is formed.

  In addition, a plurality of leg elastic members 118 are fixed in an extended state between the outer sheet 111 and the inner sheet 115 along the hollowed portions where the wearer's legs are positioned when worn. By contracting the leg elastic member 118, leg gathers are formed at positions around the legs of the wearer at the time of wearing.

  And the cushion formation area 111a of the outer seat 111 and each cushion formation sheet 112,113 are joined intermittently so that a joining part and a non-joining part may continue alternately along the extension direction of the waist elastic member 113. ing. Thereby, a "flute structure" is formed in the waist gathers of a disposable diaper. "Flute structure" means that when the elastic elastic member contracts by intermittently bonding the two layers of sheets bonded to the elastic elastic member in the stretched state along the extending direction of the elastic elastic member. This means a structure in which a space is generated between the two layers of sheets.

FIG. 10 is a perspective view conceptually showing a waist gather having a “flute structure”. In FIG. 10, a state where the waist elastic member 113 is sandwiched and fixed between the outer seat 111 and the first cushion forming sheet 112 is extracted and shown.
First, FIG. 10A shows an example in which the waist elastic member 113 is in an extended state, and the outer sheet 111 and the first cushion forming sheet 112 are stretched. As shown in FIG. 10A, the outer sheet 111 is folded back at a position corresponding to the edge of the waist opening to form a cushion forming region 11a and an elastic member joining region 11b. As shown in FIG. 10A, the cushion formation region 111 a of the outer seat 111 and the first cushion sheet 112 are intermittently joined along the longitudinal direction of the waist elastic member 113. That is, between the cushion formation region 111a and the first cushion sheet 112, the joining portions 121 and the non-joining portions 122 are alternately and continuously formed along the extending direction (diaper width direction) of the waist elastic member 113. Yes.

  FIG. 10B shows an example in which the waist elastic member 113 contracts and the outer seat 111 and the first cushion forming sheet 112 are bent from the state shown in FIG. As shown in FIG. 10B, when the waist elastic member 113 contracts, the outer sheet 111 and the first cushion forming sheet 112 bend. And since the cushion formation area | region 111a of the outer seat 111 and the 1st cushion formation sheet 112 are joined intermittently in the junction part 121, when the waist elastic member 113 shrink | contracts, the cushion formation area | region 111a and the 1st cushion formation sheet A space S is formed in the non-joining portion 122 of 112. Thus, the space S formed between the cushion forming region 111a and the first cushion forming sheet 112 functions as a cushion, and makes the feel of the waist gather flexible. In particular, the formation of the space S makes it difficult for the hardness of the bonding agent applied to the waist elastic member 113 and the hardness of the waist elastic member 113 itself to be directly transmitted to the wearer's skin. The irritation to the wearer's skin is reduced. Therefore, the wearing feeling of a disposable diaper can be made favorable.

  On the other hand, the absorbent main body 130 is disposed over the front body 101 and the back body 102 with the crotch part 103 of the exterior body 110 as the center, and comes into contact with the wearer's crotch and wears liquid such as urine when the disposable diaper 100 is worn. Keep absorbing. As shown in the developed view of FIG. 8 and the cross-sectional view of FIG.

  The absorber 131 is a member for absorbing liquid such as urine and holding the absorbed liquid. The absorber 131 is disposed between the liquid-permeable top sheet 132 and the liquid-impermeable back sheet 133. The absorber 131 has a function of absorbing the liquid that has passed through the top sheet 132 and is made of an absorbent material. A known material can be adopted as the absorbent material constituting the absorber 131. As an absorptive material, it is good also as using a fluff pulp, a superabsorbent polymer, or a hydrophilic sheet, for example. In addition, as the absorbent material, one type of fluff pulp, superabsorbent polymer, or hydrophilic sheet may be used alone, or two or more types may be used in combination. The absorbent material is usually formed and used in a single-layer or multi-layer mat shape. The absorbent material is preferably encapsulated by the upper core wrap sheet 135 and the lower core wrap sheet 136. The upper core wrap sheet 135 and the lower core wrap sheet 136 cover the absorbent material from the skin contact surface side and the skin non-contact surface side, and prevent the absorbent material from leaking outside. As the upper core wrap sheet 135 and the lower core wrap sheet 136, tissue paper, absorbent paper, a nonwoven fabric subjected to hydrophilic treatment, or the like can be used as appropriate.

  The top sheet 132 is a member that is in direct contact with the skin of the wearer's crotch and allows liquid such as urine to pass through the absorbent body 131. Therefore, the top sheet 132 is made of a liquid permeable material with high flexibility. Moreover, the top sheet 132 is arrange | positioned so that the skin contact surface side of the absorber 131 may be coat | covered. The example of the impermeable material which comprises the top sheet 132 is a woven fabric, a nonwoven fabric, or a porous film. Further, for example, a thermoplastic resin fiber such as polypropylene, polyethylene, polyester, or nylon may be hydrophilized and further made into a nonwoven fabric.

  The back sheet 133 is a member for preventing the liquid that has passed through the top sheet 132 and absorbed by the absorber 131 from leaking to the outside of the diaper. For this reason, the back sheet 133 is made of a liquid-impermeable material. The back sheet 133 covers the absorbent body 131 from the non-skin contact surface side in order to prevent liquid leakage from the bottom surface of the absorbent body 131. An example of the impermeable material constituting the back sheet 133 is a liquid impermeable film made of polyethylene resin. In particular, it is preferable to use a microporous polyethylene film in which a plurality of fine pores of 0.1 to 4 μm are formed.

  The three-dimensional gather 134 is a member that stands along both side edges of the absorber 131 and prevents side leakage of urine excreted by the wearer. Each of the pair of three-dimensional gathers 134 is provided with a plurality of three-dimensional gather expansion / contraction members 137 at the tip thereof, and rises toward the wearer's skin contact direction when the three-dimensional gather expansion / contraction member 137 contracts. . For this reason, the pair of three-dimensional gathers 134 serves as a leakage barrier for urine, and urine that has not permeated through the top sheet 132 or urine that has not been absorbed by the absorber 131 can be obtained from the openings around the legs of the disposable diaper. Prevent leaking side leaks. The three-dimensional gather 134 can employ a known configuration used in conventional disposable diapers. The three-dimensional gather 134 can be formed, for example, by sandwiching and fixing a stretched three-dimensional gather elastic member 137 between the layers of the water-repellent sheet. As the water-repellent sheet, for example, a non-woven sheet obtained by a production method such as card embossing or spunbond can be used, and it is particularly preferable to use a non-woven sheet such as SMS or SMMS having high waterproofness.

  Then, the other form of the disposable diaper manufactured by the manufacturing method concerning the present invention is explained. The disposable diaper shown in FIG. 11 is different from the disposable diaper in the form shown in FIG. 8, and the exterior body 10 is separated into a front body side exterior body 110-1 and a back body exterior body 110-2. The absorptive main body 130 is arrange | positioned so that it may bridge | crosslink to the front body side exterior body 110-1 and the back body exterior body 110-2. That is, in the disposable diaper shown in FIG. 11, one end side in the length direction of the absorbent main body 130 is fixed to the front body exterior body 110-1, and the other end side in the length direction of the absorbent main body 130 is the rear body exterior body. 110-2 is fixed. Such a disposable diaper can be manufactured using the joining apparatus 60 of the form shown, for example in FIG. That is, for example, after the sheet member forming the outer sheet 111 of the disposable diaper is fed out from the raw fabric roll, it is cut by a cutting device or the like, and the outer sheet 111 for the front body side exterior body 110-1 and the back body It is separated into an outer sheet 111 for the exterior body 110-2. And the 1st cushion formation sheet 112 is piled up on the one end part of the outer sheet | seat 111 for the front body side exterior body 110-1, and the 2nd cushion is formed in the one end part of the outer sheet | seat 111 for the back body exterior body 110-2. Forming sheets 113 are overlaid. Then, each of these sheets is introduced into the joining device 60 in a state of being overlaid. That is, in the drawing shown in FIG. 6, the 1-1 sheet S1-1 corresponds to the outer sheet 111 for the front body side exterior body 110-1, and the 1-2 sheet S1-2 is the back body. The second sheet S2 corresponds to the first cushion forming sheet 112, and the third sheet S3 corresponds to the second cushion forming sheet 113. For this reason, the outer sheet 111 for the front body side exterior body 110-1 and the first cushion forming sheet 112 are intermittently joined along the sheet flow direction, and similarly, for the rear body exterior body 110-2. The outer sheet 111 and the second cushion forming sheet 113 are joined intermittently along the flow direction of the sheet. Thereafter, the inner body for the front body side exterior body 110-1 is placed on the skin contact surface side of the outer sheet 111 for the front body side exterior body 110-1 and the outer sheet 111 for the rear body exterior body 110-2. The sheet 115 and the inner sheet 115 for the back body exterior body 110-2 are bonded together.

  As described above, if the joining device 60 having the form shown in FIG. 8 is used, the outer package 10 is a disposable diaper of the type in which the front body side outer body 110-1 and the rear body outer body 110-2 are separated. However, it becomes possible to form the said flute structure in the waist gathers part of the front body side exterior body 110-1 and the back body exterior body 110-2. In addition, about other manufacturing processes, the process similar to what was demonstrated with reference to the said FIG. 7 should just be performed.

  In the above, the joining apparatus which concerns on this invention, and the manufacturing method of the disposable diaper using the joining apparatus were demonstrated taking the preferable form as an example. However, the present invention is not limited to the above embodiment, and those skilled in the art can appropriately modify the above embodiment within the obvious range.

  The sheet joining apparatus according to the present invention can be used, for example, in a method for manufacturing a disposable diaper. For this reason, this invention can be utilized suitably in the manufacturing industry of the disposable diaper for child care and care.

DESCRIPTION OF SYMBOLS 1 ... Embossing roll 2 ... 1st horn (adhesion means)
3 ... 2nd horn (bonding means) 4 ... Guide roll (holding angle forming means)
DESCRIPTION OF SYMBOLS 5 ... Opposite roll (tensile provision means) 5a ... Upstream opposing roll 5b ... Downstream opposing roll 10 ... Roll main body 10a ... Inner part 10b ... Outer part 11 ... First pattern block 12 ... Second pattern block 13 ... Outer sheet conveyance block 14 ... Inner sheet conveying blocks 11a, 12a, 13a, 14a ... convex portion 41 ... upstream guide roll 42 ... downstream guide roll 51 ... feed roll (upstream side)
52 ... Bonding roll (upstream side) 53 ... Feed roll (downstream side)
54 ... Bonding roll (downstream side) 60 ... Joining device S1 ... First sheet S2 ... Second sheet S3 ... Third sheet

Claims (5)

A long second sheet (S2) that travels is joined to one end in the width direction of the long first sheet (S1) that travels, and travels to the other end in the width direction of the first sheet (S1). A joining device for joining the long third sheet (S3),
The joining device includes:
Embossing roll (1),
An adhesive means (2, 3) selected from an ultrasonic seal horn or a heat seal roll;
Hugging angle forming means (4),
Tension applying means (5),
The embossing roll (1)
A cylindrical roll body (10) having a rotation axis perpendicular to the traveling direction of the first sheet in a plane;
A first pattern block (11) provided at a position on the outer peripheral surface of the roll body (10) and in contact with a portion including the overlapping portion of the first sheet (S1) and the second sheet (S2); A second pattern block (12) provided at a position in contact with a portion including the overlapping portion of the first sheet (S1) and the third sheet (S3),
The adhesion means (2, 3)
It is provided at a position facing the first pattern block (11) and the second pattern block (12),
Between the first pattern block (11), by sandwiching the width direction one end of the first sheet (S1) and the second sheet (S2), to join both, and
Between the second pattern block (12), by sandwiching the other end in the width direction of the first sheet (S1) and the third sheet (S3), both are joined.
The hugging angle forming means (4)
Provided upstream of the embossing roll (1), the first sheet (S1), the second sheet (S2), and the third sheet (S3) (S1 to S3) travel. An upstream guide roll (41);
A downstream guide roll (42) that is provided on the apparatus downstream side of the embossing roll (1) and travels the sheets (S1 to S3),
The upstream guide roll (41) and the downstream guide roll (42) are:
The embossing roll (1) so that each of the sheets (S1 to S3) forms a predetermined holding angle and travels in contact with the first pattern block (11) and the second pattern block (12). Are arranged on the upstream side and downstream side of the device,
The tension applying means (5)
A pair of upstream opposing rolls (5a) provided on the upstream side of the upstream guide roll (41) and rotating with the sheets (S1 to S3) interposed therebetween;
A joining apparatus including a pair of downstream facing rolls (5b) provided on the downstream side of the downstream guide roll (42) and rotating while sandwiching the sheets (S1 to S3). No other roll device is disposed between the upstream guide roll (41) and the pair of upstream opposing rolls (5a),
The joining apparatus according to claim 1, wherein no other roll device is disposed between the downstream guide roll (42) and the pair of downstream facing rolls (5 b). When looking at the joining device from the side,
The first point (P1), which is the point where the pair of upstream facing rolls (5a) sandwich the sheets (S1 to S3), and the pair of downstream facing rolls (5b) the sheets (S1 to S3). The second point (P2) that is the point to be sandwiched is
A third point (P3) that is the point where the upstream guide roll (41) and the sheets (S1 to S3) abut, and the point where the downstream guide roll (42) and the sheets (S1 to S3) abut. The bonding apparatus according to claim 1 or 2, wherein the bonding device (2 or 3) is located on a side closer to the bonding means (2, 3) than the fourth point (P4). When looking at the joining device from the side,
On the straight line connecting the first point (P1) and the second point (P2),
The 5th point (P5) which is a point where the said embossing roll (1) and the said adhesion means (2, 3) pinch | interpose each said sheet | seat (S1-S3) is located. The joining apparatus as described in. A disposable diaper composed of a front body (101), a back body (102), and a crotch portion (103) positioned between the front body (101) and the back body (102) and having a flute structure is joined. A method of manufacturing using an apparatus,
In the step of preparing the outer sheet (111), the outer sheet (111) is composed of a single sheet connected from the front body (101) to the rear body (102), or It is composed of two sheets separated by the front body (101) side portion and the back body (102) side portion,
The skin contact surface side or the skin non-contact surface side with respect to the cushion forming region (111a) located at the front end portion of the outer body (111) on the front body (101) side and the back body (102) side In addition, the first cushion forming sheet (112) and the second cushion forming sheet (113) are intermittently joined by the joining device so that the joined portion and the non-joined portion are continuous along the width direction of the diaper. Process,
The elastic member joining region (111b) located closer to the crotch part (103) than the cushion forming region (111a) of the outer seat (111) is along the width direction of the diaper on the skin contact surface side. Fixing one or more waist elastic members (114) in a stretched state;
By folding back the cushion forming region (111a) of the outer seat (111) toward the skin contact surface side, the first cushion forming sheet (112) and the second cushion forming sheet (113), A step of sandwiching the waist elastic member (114) between the elastic member joining region (11b) and manufacturing a disposable diaper having the flute structure,
The joining device includes:
Embossing roll (1),
An adhesive means (2, 3) selected from an ultrasonic seal horn or a heat seal roll;
Hugging angle forming means (4),
Tension applying means (5),
The embossing roll (1)
A cylindrical roll body (10) having a rotational axis perpendicular to the traveling direction of the outer sheet (111) in a plane;
1st pattern block (11) provided in the outer peripheral surface of the said roll main body (10), Comprising: The position contact | abutted in the part containing the overlapping location of the said outer sheet | seat (111) and said 1st cushion formation sheet | seat (112) And a second pattern block (12) provided at a position where the outer sheet (111) and the second cushion forming sheet (113) are in contact with a portion including the overlapping portion,
The adhesion means (2, 3)
It is provided at a position facing the first pattern block (11) and the second pattern block (12),
By sandwiching the outer sheet (111) and the first cushion forming sheet (112) between the first pattern block (11), and joining both, and
By sandwiching the outer sheet (111) and the second cushion forming sheet (113) between the second pattern block (12), both are joined.
The hugging angle forming means (4)
Each sheet (111 to 113) of the outer sheet (111), the first cushion forming sheet (112), and the second cushion forming sheet (113) is provided upstream of the embossing roll (1). An upstream guide roll (41) for running
A downstream guide roll (42) that is provided downstream of the embossing roll (1) and travels the sheets (111 to 113).
The upstream guide roll (41) and the downstream guide roll (42) are:
The embossing roll (1) is configured so that each of the sheets (111 to 113) forms a predetermined holding angle and travels in contact with the first pattern block (11) and the second pattern block (12). It is arranged on the upstream side and the downstream side of the device,
The tension applying means (5)
A pair of upstream facing rolls (5a) provided on the upstream side of the upstream guide roll (41) and rotating while sandwiching the sheets (111 to 113);
A method of manufacturing a disposable diaper, comprising: a pair of downstream facing rolls (5b) provided on the downstream guide roll (42) on the apparatus downstream side and rotating with the sheets (111 to 113) interposed therebetween.

Images