WO2018042556A1 - Method and device for producing sheet-like member for absorbent article - Google Patents

Abstract

The present invention is provided with: a step for conveying a composite sheet 30mf in which a plurality of elastic members 35a, 35a…, which extend along the conveyance direction in a state of being stretched in the conveyance direction, are interposed and fixed, in a state of being arranged in the CD direction, which intersects the conveyance direction, between a first non-woven fabric 30mf1 which is continuous in the conveyance direction, and a second non-woven fabric 30mf2 which is provided overlapping the first non-woven fabric 30mf1 in the thickness direction, and which is continuous in the conveyance direction; a step S50 in which push-in members 55p are pushed in the thickness direction into positions between adjacent elastic members 35a, 35a in the composite sheet 30mf in the CD direction, to form through holes h in the composite sheet 30mf; a step S60 in which a tensile force is applied to the composite sheet 30mf in the CD direction at a position located further downstream than a through-hole-formation processing position P51 where the through holes h are formed in step S50; and a step S70 in which the composite sheet 30mf is processed at a position located further downstream in the conveyance direction than a tensile force application position P60 where the tensile force is applied in step S60.

Description

Manufacturing method and manufacturing apparatus for sheet-like member according to absorbent article

The present invention relates to a method for manufacturing a sheet-like member and an apparatus for manufacturing absorbent articles such as disposable diapers.

Conventionally, in a production line for absorbent articles such as disposable diapers that absorb excrement such as urine, a plurality of through holes are formed in a continuous sheet continuous in the conveying direction for the purpose of imparting air permeability to the absorbent article. Processing may be performed. And as an example of the formation method, Patent Document 1 discloses that a plurality of pushing members protruding from the outer peripheral surface of a rotating roll are pushed into the continuous sheet in the thickness direction.

JP 2003-171866 A

On the other hand, in the same production line, a plurality of through holes may be formed in the following composite sheet. That is, the composite sheet first has a first nonwoven fabric that is continuous in the transport direction, and a second nonwoven fabric that is continuous with the first nonwoven fabric in the thickness direction of the composite sheet and that is continuous in the transport direction. And between these 1st nonwoven fabrics and 2nd nonwoven fabrics, the some elastic member along the conveyance direction is extended in the conveyance direction, inserting in the state located in a line with the CD direction which cross | intersects a conveyance direction. , At least fixed to the first nonwoven fabric or the second nonwoven fabric.

However, when a pressing member is pressed into such a composite sheet to form a through hole, the fibers pushed away by the pressing member in the first and second nonwoven fabrics are unevenly distributed at the edge of the through hole, or the fibers are However, the composite sheet may be in an inappropriate state in which the influence of the through-hole formation process remains excessively. When the composite sheet is further processed in such an inappropriate state, the processing accuracy may be deteriorated because the processing becomes unstable.

In addition, excessive uneven distribution of fibers at the edge of the through hole as described above may lead to deterioration in touch comfort at the edge of the through hole. After that, when a diaper is manufactured, a diaper having a bad touch may be finally manufactured.

In this regard, it is effective to loosen the fibers at the edge of the through hole of the composite sheet at a position upstream of the processing step in the conveying direction as a method of improving the defect at the edge of the through hole as described above. It is thought that there is.

The present invention has been made in view of the conventional problems as described above, and the purpose of the present invention is that before the fibers at the edge of the through hole formed in the composite sheet reach a predetermined processing step. It is to quickly loosen the fibers at the edge.

The main invention for achieving the above object is:
A method for producing a sheet-like member having a plurality of through holes formed from a composite sheet continuous in a predetermined direction,
In a stretched state in the predetermined direction, between the first nonwoven fabric continuous in the predetermined direction and the second nonwoven fabric continuous in the predetermined direction while being arranged to overlap the first nonwoven fabric in the thickness direction of the composite sheet A conveying step of conveying the composite sheet, in which the plurality of elastic members along the predetermined direction are inserted and fixed in a state of being arranged in a CD direction intersecting the predetermined direction, with the predetermined direction as a conveying direction;
A through hole that forms the through hole penetrating in the thickness direction in the composite sheet by pushing a pressing member in the thickness direction into a position between the elastic members adjacent in the CD direction in the composite sheet. Forming process;
A CD direction tension applying step of applying tension in the CD direction to the composite sheet at a position downstream of the through hole forming processing position for forming the through hole in the through hole forming step;
And a processing step of processing the composite sheet at a position downstream of the tension applying position where the tension is applied in the CD direction tension applying step in the transport direction. It is a manufacturing method of a sheet-like member.

Also,
An apparatus for producing a sheet-like member having a plurality of through holes formed from a composite sheet continuous in a predetermined direction,
In a stretched state in the predetermined direction, between the first nonwoven fabric continuous in the predetermined direction and the second nonwoven fabric continuous in the predetermined direction while being arranged to overlap the first nonwoven fabric in the thickness direction of the composite sheet A plurality of elastic members along the predetermined direction, a conveying device that conveys the composite sheet, which is inserted and fixed in a state of being arranged in a CD direction intersecting the predetermined direction, with the predetermined direction as a conveying direction;
A through hole that forms the through hole penetrating in the thickness direction in the composite sheet by pushing a pressing member in the thickness direction into a position between the elastic members adjacent in the CD direction in the composite sheet. A forming device;
A CD direction tension applying device that applies tension in the CD direction to the composite sheet at a position downstream of the through hole forming processing position in which the through hole forming device forms the through hole in the composite sheet in the transport direction. When,
The CD direction tension applying device has a processing device for processing the composite sheet at a position downstream of the tension applying position for applying the tension in the CD direction to the composite sheet. It is the manufacturing apparatus of the sheet-like member which concerns on the absorbent article characterized.
Other features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

According to the present invention, before the fibers at the edge of the through hole formed in the composite sheet reach a predetermined processing step, the fibers at the edge can be quickly loosened.

It is the schematic perspective view which looked at the 3 piece type disposable diaper 1 as an example of an absorbent article from the ventral side in the underpants type state. It is the schematic plan view which looked at the same diaper 1 of the unfolded state from the skin side. FIG. 3 is a sectional view taken along line III-III in FIG. It is the schematic plan view which looked at the ventral side belt member 31 from the non-skin side of the thickness direction. FIG. 5A is a schematic enlarged view of the vent hole h according to the first embodiment as viewed from the non-skin side in the thickness direction, and FIG. 5B is a cross-sectional view taken along line BB in FIG. 5A. It is a schematic plan view of the line for demonstrating the various processes performed by a manufacturing line. It is a schematic plan view of the intermediate product 1m immediately before being conveyed to the vent hole forming step S50. It is a schematic plan view of the intermediate product 1m immediately after passing through the vent hole forming step S50. FIG. 8A is a schematic plan view of the continuous body 31a of the abdominal band member just before being conveyed to the abdominal thread rubber cutting step S80, and FIG. 8B is a continuation of the abdominal band member during and after passing through the step S80. It is a schematic plan view of the body 31a. It is a schematic side view of the vent hole forming apparatus 50 showing a part of the configuration in a longitudinal sectional view. FIG. 10 is a schematic enlarged view taken along arrow XX in FIG. 9. It is explanatory drawing of the arrangement pattern of the pin member 55p in the outer peripheral surface of the intermediate roll 55. FIG. It is explanatory drawing of the arrangement pattern of the hole part 51h in the outer peripheral surface of the upstream roll 51. FIG. 13A is an enlarged view of a portion XIIIa in FIG. 11, and FIG. 13B is a view taken along arrow BB in FIG. 13A. 14A is an enlarged schematic plan view showing the CD direction tension applying device 60, and FIG. 14B is a view taken along the line BB in FIG. 14A. 15A is a schematic side view of the abdominal cutter device 80, and FIG. 15B is a view taken along the line BB in FIG. 15A. It is a schematic explanatory drawing of the manufacturing method of 2nd Embodiment. It is a schematic explanatory drawing of the manufacturing method of 3rd Embodiment.

At least the following matters will become apparent from the description of the present specification and the accompanying drawings.
A method for producing a sheet-like member having a plurality of through holes formed from a composite sheet continuous in a predetermined direction,
In a stretched state in the predetermined direction, between the first nonwoven fabric continuous in the predetermined direction and the second nonwoven fabric continuous in the predetermined direction while being arranged to overlap the first nonwoven fabric in the thickness direction of the composite sheet A conveying step of conveying the composite sheet, in which the plurality of elastic members along the predetermined direction are inserted and fixed in a state of being arranged in a CD direction intersecting the predetermined direction, with the predetermined direction as a conveying direction;
A through hole that forms the through hole penetrating in the thickness direction in the composite sheet by pushing a pressing member in the thickness direction into a position between the elastic members adjacent in the CD direction in the composite sheet. Forming process;
A CD direction tension applying step of applying tension in the CD direction to the composite sheet at a position downstream of the through hole forming processing position for forming the through hole in the through hole forming step;
And a processing step of processing the composite sheet at a position downstream of the tension applying position where the tension is applied in the CD direction tension applying step in the transport direction. It is a manufacturing method of a sheet-like member.

According to the method for manufacturing a sheet-like member according to such an absorbent article, the tension applying position is located between the through-hole forming processing position and the processing position in the processing step in the transport direction. ing. Therefore, before the fibers at the edge of the through hole formed in the composite sheet in the through hole forming step reach the processing step, the fiber in the edge is applied with the tension in the CD direction at the tension applying position. Can be loosened quickly.

A method for producing a sheet-like member according to such an absorbent article,
A plurality of the processing steps are provided on the downstream side in the transport direction from the through hole forming processing position,
The tension applying position of the CD direction tension applying step is located between the through hole forming processing position and the position of the processing step closest to the through hole forming processing position among the plurality of processing steps. Is desirable.

According to the method for manufacturing a sheet-like member according to such an absorbent article, a CD-direction tension is applied to the composite sheet at a position immediately downstream of the through hole forming processing position. Therefore, the state of the composite sheet is changed from the most upstream processing step among the plurality of processing steps located downstream of the through hole forming processing position to an appropriate state in which the fibers at the edge of the through hole are loosened. be able to. Thus, the composite sheet can be processed with high processing accuracy from the most upstream processing step.

A method for producing a sheet-like member according to such an absorbent article,
It is desirable that there is no separate member fixing step for fixing another member to the composite sheet at a position upstream of the tension applying position in the CD direction tension applying step in the transport direction.

According to the method for manufacturing a sheet-like member related to such an absorbent article, a tension in the CD direction is applied to the composite sheet before fixing another member. Therefore, a problem that occurs when tension in the CD direction is applied after fixing another member, that is, when the other member receives the tension, it becomes difficult to transmit the tension to the composite sheet. It can prevent effectively that the effect | action which loosens the fiber of an edge part falls.

A method for producing a sheet-like member according to such an absorbent article,
The first nonwoven fabric and the second nonwoven fabric both include thermoplastic resin fibers,
In the through-hole forming step, the pushing member formed to protrude on the outer peripheral surface of the first rotating body rotating along the transport direction is formed on the outer peripheral surface of the second rotating body rotating along the transport direction. When inserted into the hole, the pushing member is pushed into the composite sheet to form the through hole,
At least one of the first rotating body and the second rotating body is heated, and the composite sheet is heated by the rotating body,
In the CD direction tension applying step, it is preferable that the tension in the CD direction is applied to the composite sheet in a state where the temperature is higher than the temperature of the composite sheet before being heated by the rotating body.

According to the method for manufacturing a sheet-like member related to such an absorbent article, a CD direction tension is applied to the composite sheet while the temperature of the composite sheet is high. Therefore, the fiber can be loosened in a state in which the fiber at the edge of the through hole of the sheet is softened, which makes it easy to loosen the fiber.

A method for producing a sheet-like member according to such an absorbent article,
It is desirable that the dimension in the CD direction of the composite sheet at the tension applying position is equal to or larger than the dimension in the CD direction of the composite sheet at the through hole forming processing position.

According to the manufacturing method of the sheet-like member related to such an absorbent article, the dimension in the CD direction of the composite sheet at the tension applying position in the CD direction tension applying step is set as the through hole forming process position in the through hole forming step. The size in the CD direction of the composite sheet is larger than that of the above. Accordingly, the CD direction dimension of the composite sheet that can be reduced due to the tension for conveyance while being conveyed from the through hole formation processing position to the tension applying position is at least the CD direction when the through hole is formed. Can be expanded to Thus, in the CD direction tension applying step, tension in the CD direction can be reliably applied to the composite sheet, and as a result, the fibers at the edge of the through hole of the composite sheet can be reliably loosened.

A method for producing a sheet-like member according to such an absorbent article,
In the CD direction tension applying step, the tension in the CD direction is applied so that the dimension in the CD direction of the through hole at the tension applying position is larger than the size of the pushing member in the CD direction. It is desirable to do.

According to the method for manufacturing a sheet-like member related to such an absorbent article, the CD dimension of the through hole at the tension applying position is larger than the CD dimension of the pushing member. In the directional tension applying step, a tension in the CD direction is applied to the composite sheet. Therefore, while the composite sheet is being transported from the through-hole forming process position in the through-hole forming process to the tension applying position in the CD-direction tension applying process, the composite sheet can be reduced in the CD direction due to the transport tension. The dimension can be expanded to at least the dimension in the CD direction when the through hole is formed. Thus, in the CD direction tension applying step, tension in the CD direction can be reliably applied to the composite sheet, and as a result, the fibers at the edge of the through hole of the composite sheet can be reliably loosened.

A method for producing a sheet-like member according to such an absorbent article,
A CD direction tension applying step for applying tension in the CD direction to the composite sheet on the upstream side in the transport direction from the through-hole forming processing position;
In the through hole forming step, it is preferable that the through hole is formed in the composite sheet in a state where the tension in the CD direction is applied.

According to the method of manufacturing a sheet-like member related to such an absorbent article, the composite sheet has an elastic member, and when the composite sheet is transported in the transport direction, the composite tension is used as the transport tension. A tension is applied to the sheet in a direction along the conveyance direction. Therefore, the sheet can contract in the CD direction by the amount that the composite sheet is extended in the transport direction by the transport tension. As a result of this shrinkage, the fibers of the composite sheet as a whole move from the end side in the CD direction to the center side, and as a result, the density of the fiber distribution in the composite sheet is biased with respect to the CD direction. And, if the through-hole is formed in the composite sheet in an improper state having such a density, the formation of the through-hole becomes unstable and the formation accuracy of the through-hole may be lowered. According to this manufacturing method, the through hole is formed in the composite sheet in a state where the tension in the CD direction is applied to the composite sheet. Therefore, at the time of formation of the through hole, the composite sheet is changed from an inappropriate state in which the density of the fiber distribution is biased with respect to the CD direction to an appropriate state in which the density bias is reduced. Formation accuracy can be increased.

Also,
An apparatus for producing a sheet-like member having a plurality of through holes formed from a composite sheet continuous in a predetermined direction,
In a stretched state in the predetermined direction, between the first nonwoven fabric continuous in the predetermined direction and the second nonwoven fabric continuous in the predetermined direction while being arranged to overlap the first nonwoven fabric in the thickness direction of the composite sheet A plurality of elastic members along the predetermined direction, a conveying device that conveys the composite sheet, which is inserted and fixed in a state of being arranged in a CD direction intersecting the predetermined direction, with the predetermined direction as a conveying direction;
A through hole that forms the through hole penetrating in the thickness direction in the composite sheet by pushing a pressing member in the thickness direction into a position between the elastic members adjacent in the CD direction in the composite sheet. A forming device;
A CD direction tension applying device that applies tension in the CD direction to the composite sheet at a position downstream of the through hole forming processing position in which the through hole forming device forms the through hole in the composite sheet in the transport direction. When,
The CD direction tension applying device has a processing device for processing the composite sheet at a position downstream of the tension applying position for applying the tension in the CD direction to the composite sheet. It is the manufacturing apparatus of the sheet-like member which concerns on the absorbent article characterized.

According to the sheet-like member manufacturing apparatus relating to such an absorbent article, the same effects as those of the manufacturing method described above can be achieved.

=== First Embodiment ===
The manufacturing method and manufacturing apparatus of the sheet-like member which concern on the absorbent article of 1st Embodiment are used in the manufacturing line of the disposable diaper 1 as an example of an absorbent article, for example. FIG. 1: is the schematic perspective view which looked at the 3 piece type diaper 1 as an example of the disposable diaper 1 from the abdominal side in the underpants type state. 2 is a schematic plan view of the unfolded diaper 1 as seen from the skin side, and FIG. 3 is a sectional view taken along line III-III in FIG.

The diaper 1 has an up-down direction, a lateral direction, and a front-rear direction as three directions orthogonal to each other in the pant-type state of FIG. In the following description, the upper side and the lower side in the up-and-down direction in this pant-type state are also referred to as the “trunk opening side” and the “inseam side”, respectively, and the front side and the rear side in the front-rear direction are respectively “ Also referred to as “ventral” and “dorsal”.
On the other hand, in the unfolded state of FIGS. 2 and 3, the diaper 1 has a vertical direction, a horizontal direction, and a thickness direction as three directions orthogonal to each other. In the following, in the developed state, the one side and the other side in the vertical direction are also referred to as “abdominal side” and “back side”, respectively, and the one side and the other side in the thickness direction are respectively referred to as “skin”. Also referred to as “side” and “non-skin side”.
Incidentally, the lateral direction has the same meaning in the pant-type state and the unfolded state. In addition, the vertical direction of the unfolded state is along the vertical direction of the pants-type state, and the thickness direction of the unfolded state is along the front-back direction of the pants-type state.
Further, in the unfolded state of FIGS. 2 and 3, the diaper in a state where it is virtually expanded that there is no contraction force due to the thread rubber 16, 35, 45, which will be described later, an elastic member for imparting stretchability to the diaper 1. 1 is shown.

Since this diaper 1 is a so-called three-piece type, in the developed state of FIG. 2, it has an absorbent main body 10 that absorbs excrement as a first part, and a ventral belt member 31 as a second part, A back band member 41 is provided as a third part. Specifically, in the state where the ventral belt member 31 and the back belt member 41 are arranged in parallel in the vertical direction, the absorbent main body 10 is stretched between the both 31 and 41 while the same absorbency. End portions 10ea and 10eb in the longitudinal direction of the main body 10 are joined and fixed to the nearest belt members 31 and 41, respectively, and the external shape thereof is substantially H-shaped in plan view.
Then, from the substantially H-shaped developed state, the absorbent main body 10 is folded in two with a predetermined position CL10 in the vertical direction of the absorbent main body 10 (a position corresponding to the central position CL1 of the diaper 1 in the vertical direction) as a folding position. In addition, when the band members 31, 41 facing each other in the folded state are joined by welding or the like at the end portions 31e, 41e in the lateral direction, the band members 31, 41 are connected in a ring shape. Thus, the pants-type diaper 1 is formed in which the waistline opening BH and the pair of leg-hole openings LH and LH as shown in FIG. 1 are formed.

2 and 3, the absorbent main body 10 has a substantially rectangular shape in plan view. And the longitudinal direction of the absorptive main body 10 is distribute | arranged so that the vertical direction may be followed. Moreover, the absorptive main body 10 has an absorbent body 11, a top sheet 13 provided so as to cover the absorbent body 11 from the skin side, a back sheet 15 provided so as to cover the absorbent body 11 from the non-skin side, It has.

The absorbent body 11 includes a liquid absorbent absorbent core 11c and a core wrap sheet such as tissue paper (not shown) that covers the outer peripheral surface of the core 11c. The absorbent core 11c is a molded body obtained by molding a predetermined liquid absorbent material into a substantially hourglass shape in plan view as an example of a predetermined shape. As a liquid absorptive material, liquid absorptive granular materials, such as liquid absorptive fibers, such as pulp fiber, and superabsorbent polymer (what is called SAP) can be illustrated.

The top sheet 13 is a liquid-permeable sheet such as a non-woven fabric having a planar size that protrudes from the absorbent body 11 in the vertical and horizontal directions. The back sheet 15 is also a planar sheet that protrudes from the absorbent body 11 in the vertical direction and the horizontal direction, and an example thereof is a laminate sheet 15 having a two-layer structure as shown in FIG. That is, the laminate sheet 15 has a liquid-impermeable leak-proof sheet 15a such as a polyethylene film (PE) and a polypropylene film (PP) on the skin side, and a non-skin-made exterior sheet 15b on the non-skin side. have.
Then, in a state where the absorbent body 11 is sandwiched between the top sheet 13 and the back sheet 15, the two sheets 13, 15 are bonded to each other in a frame shape, for example, at a portion protruding from the absorbent body 11 in the vertical direction and the horizontal direction. The absorptive main body 10 is formed by joining by welding or the like. Note that the back sheet 15 may include only the leak-proof sheet 15a without including the exterior sheet 15b.

Further, as in the example of FIG. 2, leg gathers LG that extend and contract in the vertical direction may be provided in each portion 10 LG in the lateral direction outside the absorbent body 11 in the absorbent main body 10. Such leg gathers LG constitute part of the leg opening LH. Further, the stretchability of the leg gather LG is given by fixing the rubber thread 16 as an elastic member in the longitudinal direction in each of the portions 10LG in the longitudinal direction. In addition to the leg gather LG, so-called three-dimensional gathers (not shown) may be provided as leak-proof wall portions on both lateral sides of the absorbent main body 10 for the purpose of preventing side leakage.

On the other hand, as shown in FIG. 2, the ventral band member 31 is a sheet member having a substantially rectangular shape in a plan view made of nonwoven fabrics 32 and 33. In this example, as shown in FIG. 3, the ventral band member 31 is formed by joining two nonwoven fabrics 32 and 33 with a hot melt adhesive. As shown in FIGS. 2 and 3, the center part in the lateral direction of the ventral band member 31 is overlapped and joined from the non-skin side to the end part 10 ea in the longitudinal direction in the absorbent main body 10. .

Similarly to the ventral belt member 31, the back belt member 41 is a sheet member having a substantially rectangular shape in plan view made of nonwoven fabrics 42 and 43. In this example, as shown in FIG. Thus, the back band member 41 is formed by joining the nonwoven fabrics 42 and 43 to each other. Then, as shown in FIGS. 2 and 3, the lateral center portion of the back band member 41 is overlapped and joined to the longitudinal back end portion 10 eb of the absorbent main body 10 from the non-skin side. .

The content described below is common to both the ventral belt member 31 and the back belt member 41. Therefore, here, only the ventral band member 31 will be described on behalf of both, and the back side band member 41 will only be indicated by the reference numerals of the corresponding members in parentheses.

As shown in FIG.2 and FIG.3, between the two nonwoven fabrics 32 and 33 (42, 43) which concern on the ventral | abdominal band member 31 (41), a plurality of thread rubbers as elastic members along the lateral direction are provided. 35, 35... (45, 45...) Are inserted side by side in the vertical direction, and bonded and fixed to the nonwoven fabrics 32, 33 (42, 43) with a hot melt adhesive while extending in the horizontal direction. And thereby, the stretchability of the horizontal direction is provided to the ventral side belt member 31 (41).

In this example, as shown in FIG. 2, at least a part of the ventral belt member 31 (41) that overlaps the absorbent core 11 c (for example, the central portion in the lateral direction) The rubber thread 35 (45) is discontinuous for the purpose of preventing the occurrence. And thereby, the elasticity is not provided about this part.
That is, as shown in the schematic plan view of the ventral band member 31 of FIG. 4 viewed from the non-skin side in the thickness direction, the ventral band member 31 (41) is divided into two regions AU, AD in the vertical direction, When the region AU positioned on the waist opening BH side in the vertical direction is referred to as “upper region AU” and the region AD positioned on the crotch side is referred to as “lower region AD”, the former upper region The absorbent core 11c of the absorbent main body 10 generally does not overlap with the AU. Therefore, the upper region AU is given stretchability over substantially the entire length in the lateral direction. That is, the upper region AU is provided with the rubber threads 35, 35... (45, 45...) Over substantially the entire length in the lateral direction.

On the other hand, in the latter lower region AD, the absorbent core 11c of the absorbent main body 10 is overlapped with the lateral central region ADc, so that the rubber thread 35, 35. As a result, there is a non-stretchable region AL that has almost no lateral stretchability in the central portion of the central region ADc. However, since the absorbent core 11c does not substantially overlap the end side areas ADe, ADe located on both sides of the central area ADc, the end rubbers 35, 35... (45, 45..., And the end-side regions ADe, ADe are thus stretchable regions AH, AH having higher stretchability than the non-stretchable region AL. The formation of the non-stretchable region AL and the stretchable region AH in the lower region AD is realized by a thread rubber continuum 35a (45a) arranged transversely across the central portion (see FIG. 8A and FIG. 8B) is cut at the central portion, and such cutting processing will be described later.

Further, examples of the fineness of the thread rubber 35 (45) include 400 dtex to 1000 dtex, and specific examples of the thread rubber 35 (45) include LYCRA (trademark). However, it is not limited to this.

Furthermore, in this example, as shown in FIG. 3, the plane size of the nonwoven fabric 33 (43) positioned on the non-skin side in the thickness direction of the two nonwoven fabrics 32, 33 (42, 43) is the skin side. The size is such that it protrudes outward in the longitudinal direction from the non-woven fabric 32 (42) located at the center. And the part which protrudes in the former nonwoven fabric 33 (43) is folded inward in the vertical direction, and this folded portion 33B (43B) is the longitudinal end portion 32Le (42Le) of the latter nonwoven fabric 32 (42). Is not limited to this.

Moreover, as shown in FIG.2 and FIG.4, 31s on which the absorptive main body 10 is not piled up including the said end side area | region ADe on the both sides of the horizontal direction in said ventral belt member 31 (41). (41s) (hereinafter also referred to as an absorbent main body non-existing portion 31s (41s)), the absorbent main body non-existing portion 31s (41s) is the same for the purpose of improving air permeability. A plurality of vent holes h (h) penetrating through the non-existing portion 31s (41s) are discretely formed in a predetermined arrangement pattern, whereby the vent holes h (h) are a group of the vent holes h. The ventilation hole group Gh31 (Gh41) is formed. That is, in this example, a plurality of vent holes h, h... (In the positions between the thread rubbers 35, 35 (45, 45) adjacent in the longitudinal direction in the absorbent main body non-existing portion 31s (41s). h, h... are formed side by side in the horizontal direction at a predetermined formation pitch, whereby the vent holes h, h... (h, h...) are arranged in the vent hole row Rh31 (Rh41) along the horizontal direction. ). Further, the vent hole rows Rh31 and Rh31 (Rh41, Rh41) adjacent in the vertical direction are shifted from each other in the horizontal direction by a half value of the formation pitch. Thus, the vent holes h, h... (H, h...) Form a vent hole group Gh31 (Gh41) arranged in a staggered arrangement. However, it is not limited to this. For example, the air holes h, h... (H, h...) May be formed in a lattice arrangement.

Further, in this example, each of the vent holes h, h... Is formed with a perfect circle having a diameter of, for example, 0.2 mm to 3 mm as a target opening shape. There are also pores h, h. The diameter of such a non-circular vent hole h varies depending on the circumferential position of the vent hole h, and such a varying diameter is also in the range of 0.2 mm to 3 mm, for example. In. Therefore, each vent hole h can quickly exhibit the desired air permeability. However, the target opening shape of the vent hole h is not limited to the above-described perfect circle. For example, it may be a polygon such as a regular triangle or a square.

5A shows a schematic enlarged view of the air vent h as seen from the non-skin side in the thickness direction, and FIG. 5B shows a cross-sectional view taken along the line BB in FIG. 5A. As can be seen with reference to FIG. 4, the burrs B protrude from the edge he of the vent hole h. In other words, the edge he is present in the nonwoven fabrics 32 and 33 (42 and 43), since fibers pushed away by the pin member 55p described later are densely present. In addition, it is an unevenly distributed portion where many fibers are present, and the edge portion he is a highly entangled strength portion in which constituent fibers are firmly entangled. And when such uneven distribution and entanglement intensity become excessive, the malfunction described at the beginning may be caused. Therefore, in the production line of the diaper 1 described later, a step S60 (FIG. 6) for loosening the fibers of the edge he is provided, and in this diaper 1, the uneven distribution of fibers at the edge he is reduced. Has been.

Furthermore, in this example, a spunbond nonwoven fabric is used for both of the two nonwoven fabrics 32 and 33 related to the ventral belt member 31 and the two nonwoven fabrics 42 and 43 related to the back belt member 41. However, the present invention is not limited to this, and another type of nonwoven fabric such as SMS (spunbond / meltblown / spunbond) nonwoven fabric may be used. In this example, a single fiber of polypropylene (PP), which is a representative example of a thermoplastic resin, is used as a constituent fiber of the nonwoven fabric. However, the present invention is not limited to this. For example, a single fiber of other thermoplastic resin such as polyethylene (PE) may be used, or a composite fiber such as a sheath core structure of PE and PP may be used.

Such a diaper 1 is manufactured on a manufacturing line. In the same line, the intermediate product 1m of the diaper 1 is transported along a predetermined transport direction (corresponding to a transport process). During the conveyance, the intermediate product 1m is subjected to various processes, and each time the respective processes are performed, the form of the intermediate product 1m is changed sequentially. Finally, as shown in FIG. Diaper 1 is completed.

In the following, the width direction of the production line is also referred to as “CD direction”. In this example, the CD direction is along the horizontal direction. In this production line, the intermediate product 1m is transported with an arbitrary direction in a plane orthogonal to the CD direction as the transport direction. That is, the transport direction is directed in a direction defined by both a vertical up-down direction and a horizontal front-back direction. The “vertical direction” and “front / rear direction” referred to here are different directions that are not directly related to the “vertical direction” and “front / rear direction” used in the description of the diaper 1, respectively.

Also, the intermediate product 1m is transported by an appropriate transport device such as a belt conveyor or a transport roller. Therefore, unless otherwise specified, it is assumed that the intermediate product 1m is transported in the transport direction by these transport devices. In addition, as an example of a belt conveyor, the normal belt conveyor which has the endless belt which carries out a driving | running | working rotation as a conveyance surface, the suction belt conveyor which has the adsorption function in the outer peripheral surface of an endless belt, etc. can be mentioned.

FIG. 6 is a schematic plan view of the same line for explaining various processes performed in the production line. The production line includes a vent hole forming step S50 (corresponding to the through hole forming step), a CD direction tension applying step S60, a slit step S70 (corresponding to the processing step), and a gap forming step S75 (corresponding to the processing step), An abdominal thread rubber cutting step S80 (corresponding to the processing step), a back side rubber thread cutting step S90 (corresponding to the processing step), an absorbent main body attaching step S100 (corresponding to the processing step and the separate member fixing step); It has a folding process S110 (corresponding to the machining process), a side seal process S120 (corresponding to the machining process), and a cutting process S130 (corresponding to the machining process). The positions where these steps S50 to S130 are performed are arranged in this order from the upstream side to the downstream side in the transport direction.

FIG. 7A is a schematic plan view of the intermediate product 1m immediately before being conveyed to the vent hole forming step S50, and FIG. 7B is a schematic plan view of the intermediate product 1m just after passing through the vent hole forming step S50.

As can be seen by comparing FIGS. 7A and 7B, in this vent hole forming step S50, the vent holes h, h described above are formed on the intermediate product 1m serving as the base material of both the ventral belt member 31 and the back belt member 41. ... (equivalent to a through hole) is formed. Here, in this production line, the intermediate product 1m is conveyed in a so-called transverse flow conveyance form. That is, the intermediate product 1m is transported in a posture in which the horizontal direction of the diaper 1 faces the transport direction and the vertical direction faces the CD direction. Therefore, as shown in FIG. 7A, the form of the intermediate product 1m at the time when it is sent from the upper process to the vent hole forming process S50 is generally a ventral band in which a plurality of ventral band members 31, 31,. A continuous body 31a of members and a continuous body 41a of back-side belt members in which a plurality of back- side belt members 41, 41,... Are continuous in the lateral direction form one sheet-like member 30mf integrally connected in the CD direction. Yes.

More precisely, the sheet-like member 30mf has a size in the CD direction corresponding to the added value of the longitudinal dimension of the nonwoven fabric 32 of the ventral belt member 31 and the longitudinal dimension of the nonwoven fabric 42 of the dorsal belt member 41. In addition to the continuous nonwoven fabric 30mf1 (corresponding to the first nonwoven fabric) that is continuous in the conveying direction, and the longitudinal dimension of the nonwoven fabric 33 of the ventral belt member 31 and the longitudinal dimension of the nonwoven fabric 43 of the dorsal belt member 41 A continuous nonwoven fabric 30mf2 (corresponding to a second nonwoven fabric) that has a size in the CD direction and that is continuous in the transport direction. And these continuous nonwoven fabrics 30mf1 and 30mf2 are joined with the hot-melt adhesive in the state of the two-ply piled up in the thickness direction. In addition, between the continuous nonwoven fabrics 30mf1 and 30mf2, a plurality of thread rubber continuums 35a and 45a to be the plurality of thread rubbers 35 and 45 are continuously extended in the transport direction along the transport direction. However, it is inserted in a state of being lined up in the CD direction and fixed to each continuous nonwoven fabric 30mf1, 30mf2. Furthermore, one continuous nonwoven fabric 30mf2 of the two continuous nonwoven fabrics 30mf1 and 30mf2 has a larger size in the CD direction than the other continuous nonwoven fabric 30mf1, whereby the one continuous nonwoven fabric 30mf2 is the former. It has portions 30mf2p1 and 30mf2p2 projecting on both sides in the CD direction from the other continuous nonwoven fabric 30mf1 which is the latter. The protruding portions 30mf2p1 and 30mf2p2 are folded back inward in the CD direction, thereby forming portions corresponding to the folded portions 33B and 43B.

Then, in this vent hole forming step S50, the intermediate product 1m of FIG. 7A, which is such a sheet-like member 30mf (corresponding to a composite sheet), is provided with a ventral band in one region in the CD direction as shown in FIG. 7B. A pair of ventilation hole groups Gh31, Gh31 of the member 31 are repeatedly formed at the product pitch P1 in the conveying direction, respectively, and a pair of ventilation hole groups Gh41, Gh41 of the back band member 41 are respectively arranged in the conveying direction in the other side region. It is repeatedly formed at the product pitch P1. The product pitch P1 referred to here is substantially the same as the lateral total lengths L31 and L41 of the ventral belt member 31 and the back belt member 41 in the unfolded state of FIG.

In the next CD direction tension applying step S60, as shown in FIG. 6, tension is applied in the CD direction to the sheet-like member 30mf in which the air holes h have been formed as the intermediate product 1m. Then, by this tension, the fibers at the edge portion he of the vent hole h are loosened, thereby forming the vent hole h remaining in the sheet-like member 30mf such as excessive uneven distribution of the fibers at the edge he of the vent hole h. The sheet-like member 30mf is sent to various processes S70 to S130 such as the subsequent slit process S70 in an appropriate state in which the influence of the above is reduced. As a result, it is possible to increase the accuracy of processing performed in these steps S70 to S130. The CD direction tension is applied to the sheet-like member 30mf by the CD direction tension applying device 60, which will be described later.

In the next slitting step S70, as shown in FIG. 6, the sheet-like member 30mf is divided into two in the CD direction, whereby the continuum 31a of the ventral belt member in which the thread rubber continuum 35a is in an uncut state. And a continuous body 41a of the back band member in which the continuous body 45a of the rubber thread is in an uncut state.

In the next interval forming step S75, the abdomen belt member continuum 31a and the back belt member continuum 41a as the intermediate product 1m are respectively moved outward in the CD direction. As a result, between the continuous bodies 31a and 41a in the CD direction, a size corresponding to the longitudinal distance Ld between the ventral belt member 31 and the back belt member 41 in the developed diaper 1 of FIG. A gap is formed.

In the next ventral thread rubber cutting step S80, when the continuous body 31a of the ventral belt member passes, the thread rubber continuous body 35a is cut in the area AL1 corresponding to the non-stretchable area AL in the continuous body 31a. Thus, the non-stretchable region AL is formed in the continuum 31a of the ventral band member. Details are as follows.

First, in the continuum 31a of the ventral band member, as shown in the schematic plan view of FIG. 8A, the region on one side in the CD direction corresponds to the upper region AU in the ventral band member 31 described above, The region also corresponds to the lower region AD. At this time, the rubber thread continuum 35a is arranged in both regions in a state of extending in the transport direction along the transport direction. However, in the former area corresponding to the upper area AU, the thread rubber continuous body 35a is fixed with a hot melt adhesive over the entire length in the conveying direction, but the latter area corresponding to the lower area AD. In the other region, there are a fixed region AH1 where the thread rubber continuous body 35a is fixed and a non-fixed non-fixed region AL1 in the transport direction. The non-fixed area AL1 exists at the product pitch P1 in the transport direction and the size of the non-stretchable area AL described above in the transport direction.
Therefore, as shown in the right part of FIG. 8B, when the thread rubber continuum 35a is cut at a predetermined position PC in the non-fixed area AL1, the downstream end 35aed of the thread rubber continuum 35a becomes the continuum 35a. Detached from. Then, the upstream portion 35eu of the cut rubber thread 35 contracts toward the fixing region AH1 located on the downstream side. Further, the portion 35aedn, which has become a new downstream end portion of the thread rubber continuum 35a based on the above-described cutting, contracts toward the fixing region AH1 located on the upstream side. As a result, as shown in the left part of FIG. 8B, the non-fixed area AL1 is in a state where the rubber thread 35 does not exist, and as a result, the non-fixed area AL1 becomes the above-described non-stretchable area AL. On the other hand, as shown in FIG. 8B, the fixed region AH1 includes the separated rubber thread 35 and the new downstream end portion 35aedn based on the fixing with the hot melt adhesive. Since each stays, the thread rubber 35 imparts stretchability to the fixed region AH1. Thereby, the fixed area AH1 becomes the above-described stretchable area AH.

In the next back-side rubber thread cutting step S90, when the continuous body 41a of the back-side belt member shown in FIG. 6 passes, a continuous thread rubber body 45a in the area AL1 corresponding to the non-stretchable area AL in the continuous body 41a. As a result, the non-stretchable region AL is formed in the continuum 41a of the back band member. The forming process of the non-stretchable area AL by this cutting is substantially the same as the above-described cutting process performed on the continuous body 31a of the ventral belt member. Therefore, the description is omitted.

In the next absorptive main body attaching step S100, a single sheet generated in a separate step (not shown) between the continuous members 31a, 41a of the respective band members sent as the intermediate product 1m from each of the above rubber thread cutting steps S80, S90. The intermediate absorbent body 10 is stretched and fixed, whereby the intermediate product 1m is a substantially ladder-shaped diaper continuum 1Ha in which the diapers 1H, 1H,. In the form of

In the next two-folding step S110, the continuous body 1Ha of the substantially ladder-shaped diaper, which is the intermediate product 1m, is formed so that the continuous body 31a of the abdominal band member and the continuous body 41a of the back side band member overlap vertically. Fold it.

In the next side seal process S120, the continuum 31a of the ventral band member and the continuum 41a of the dorsal band member that are vertically stacked in the two-fold process S110 correspond to the lateral ends 31e and 41e of the diaper 1. The side seal portion SS is formed by welding at the position, and is thereby fixed in a folded state. As a result, the intermediate product 1m is in the form of a continuous body 1a of a pant-type diaper in which a plurality of pant- type diapers 1, 1,.

Then, in the last cutting step S130, the continuous body 1a of the pants-type diaper as the intermediate product 1m is cut by each side seal portion SS, and thereby the pants-type diaper 1 is manufactured.

Hereinafter, the steps S50 to S100 will be described in more detail. Here, it is apparent that the steps S110 to S130 after the bi-folding step S110 can be appropriately realized by a well-known method. do not do.

<<< Vent formation process S50 >>>
In the vent hole forming step S50, a vent hole forming device 50 (corresponding to a through hole forming device) for forming the vent hole h in the sheet-like member 30mf is disposed. FIG. 9 is a schematic side view of the apparatus 50 showing a part of the configuration (upstream roll 51 and downstream roll 58) in a longitudinal sectional view, and FIG. 10 is a schematic view taken along the line XX in FIG. It is an enlarged view.
As shown in FIG. 9, the vent hole forming apparatus 50 includes three rolls 51, 55, and 58 that are driven and rotated around a rotation axis along the CD direction. That is, the rolls 51, 55, 58 are arranged in the order of the upstream roll 51, the intermediate roll 55, and the downstream roll 58 from the upstream side to the downstream side in the transport direction. Further, the intermediate roll 55 is disposed close to each of the rolls 51 and 58 so that both the upstream roll 51 and the downstream roll 58 are opposed to each other. Then, the sheet-like member 30mf sent as the intermediate product 1m to the vent hole forming device 50 is conveyed by a substantially Ω-shaped conveyance route based on the rotational operation of these three rolls 51, 55, 58. . That is, first, the sheet-like member 30mf is conveyed on the arc-shaped first conveyance route R51 that is wound around the upstream roll 51, and then is arc-shaped second that is wound on the intermediate roll 55. It is transported on the transport route R55, and finally transported on the arc-shaped third transport route R58 that is wound around the downstream roll 58. Then, thereafter, the sheet-like member 30mf leaves the downstream roll 58 and is sent to the next CD direction tension applying step S60.
The upstream roll 51 and the intermediate roll 55 are closest to each other at a predetermined position P51 in the rotation direction Dc51 of the upstream roll 51. This closest approach position P51 is from the first transport route R51 to the second transport route. This is the position to switch to R55. Similarly, the intermediate roll 55 and the downstream roll 58 are closest to each other at a predetermined position P55 in the rotation direction Dc55 of the intermediate roll 55. This closest approach position P55 is from the second transport route R55 to the third transport route. This is the position to switch to R58.

The intermediate roll 55 has a plurality of pin members 55p, 55p,. Each pin member 55p, 55p ... is a member whose tip end side is tapered. That is, as shown in FIG. 10, in this example, the pin member 55p has a conical portion 55pa on the distal end side, and a cylindrical portion 55pb having the same diameter as the bottom surface of the conical portion 55pa on the root side. . Moreover, the outer peripheral surface of the upstream roll 51 has holes 51h, 51h... Into which pin members 55p, 55p. That is, the hole 51h has a diameter larger than the diameter of the conical portion 55pa of the pin member 55p in the range where the pin member 55p is inserted. And in said closest approach position P51, each hole 51h is formed corresponding to each pin member 55p so that only one pin member 55p is inserted in one hole 51h.

Therefore, when the portion to be formed in which the vent hole h is to be formed in the sheet-like member 30mf located on the upstream roll 51 in FIG. 9 passes the closest position P51, as shown in FIG. When the corresponding pin member 55p is inserted into each hole 51h of the roll 51, the pin member 55p is smoothly pushed into the formation target portion of the sheet-like member 30mf, and thereby the formation target portion. The vent hole h is quickly formed through.
Incidentally, in this example, since the vent hole h is formed at the closest approach position P51 as described above, hereinafter, the closest approach position P51 is referred to as the vent hole forming process position P51 (corresponding to the through hole forming process position). Also say.

Further, as shown in the enlarged view of the main part in FIG. 10, when forming the vent hole h, the two continuous nonwoven fabrics 30mf1 and 30mf2 constituting the sheet-like member 30mf are formed in the thickness direction by the pin member 55p. It is pushed into. Then, the fibers of the continuous nonwoven fabric 30mf1 pushed away by the pin member 55p and the constituent fibers of the continuous nonwoven fabric 30mf2 are densely present together at the edge he of the vent hole h. Is an unevenly distributed portion with more constituent fibers than the other portions, and is a highly entangled strength portion in which the constituent fibers are strongly entangled. When the uneven distribution and the entanglement strength are excessive, the touch comfort at the edge he of the vent hole h is deteriorated, and the sheet-like member 3mf is subjected to another processing after the vent hole h is formed. However, since the sheet-like member 30mf is processed in an inappropriate state in which the influence of the formation process of the vent hole h as described above remains excessively, the processing accuracy may be deteriorated. Therefore, in the manufacturing method and the manufacturing apparatus, the above-described CD direction tension applying step S60 is provided. That is, in the same step S60, the fibers at the edge portion he of the vent hole h formed in the sheet-like member 30mf are loosened, and then the sheet-like member 30mf is sent to each of the processing steps S70 to S130. Details of the CD direction tension applying step S60 will be described later.

Incidentally, the apex angle of the conical portion 55pa of FIG. 10 is selected from a range of 20 ° to 45 °, for example, and is 36 ° in this example. The height of the conical portion 55pa is selected from a range of 3 mm to 8 mm, for example, and is 4.6 mm in this example. However, it is not limited to this. Furthermore, in this example, the edge of the hole 51h is chamfered, but the present invention is not limited to this, that is, it may not be chamfered.

Further, in this example, the intermediate roll 55 in FIG. 9 forms the ventilation hole groups Gh31, Gh31, Gh31, Gh31, Gh41, Gh41, Gh41, and Gh41 for two diapers per rotation as shown in FIG. 7B. The circumference is a large-diameter roll having a length corresponding to approximately twice the product pitch P1 described above. On the other hand, the upstream roll 51 of FIG. 9 has a circumference corresponding to the product pitch P1 so that the air hole group Gh31, Gh31, Gh41, Gh41 corresponding to one diaper of FIG. It is a small diameter roll. However, it is not limited to this.

FIG. 11 is an explanatory diagram of an arrangement pattern of the pin members 55p on the outer circumferential surface of the intermediate roll 55, and FIG. 12 is an explanatory diagram of an arrangement pattern of the hole portions 51h on the outer circumferential surface of the upstream roll 51. In any of the drawings, the outer peripheral surfaces of the rolls 55 and 51 are shown on a plane. Further, in FIG. 11, a receiving portion 55r to be described later is not shown for the purpose of preventing complication of the drawing.

As shown in FIG. 11, the pin member 55p is provided so as to correspond to the vent hole groups Gh31 and Gh41 formed in the aforementioned sheet-like member 30mf. That is, as shown in FIG. 7B, a pair of vent holes Gh31 and Gh31 should be formed for the ventral belt member 31 for each diaper in the region on one side in the CD direction of the sheet-like member 30mf. As shown in FIG. 11, pin member groups G55p1 and G55p1 having a plurality of pin members 55p in the same zigzag arrangement as the vent hole group Gh31 are formed in one region in the CD direction on the outer peripheral surface of the intermediate roll 55. A pair is provided in the rotational direction Dc55. Similarly, a pair of vent holes Gh41 and Gh41 for the back band member 41 for each diaper should be formed in the other region in the CD direction in the sheet-like member 30mf. A pair of pin member groups G55p2 and G55p2 having a plurality of pin members 55p with the same staggered arrangement as the vent hole group Gh41 are provided side by side in the rotation direction Dc55 in the region on the other side in the CD direction on the outer peripheral surface.

In this example, as described above, since the intermediate roll 55 forms the ventilation holes h for two diapers by one rotation, the pair of pin member groups G55p1, G55p1 (G55p2, G55p2) arranged in the rotation direction Dc55. ) As one set of pin member group set SG55p1 (SG55p2), the outer peripheral surface of the intermediate roll 55 has two sets of pin member group sets SG55p1, SG55p1 (SG55p2, SG55p2) are provided side by side.

Further, FIG. 13A shows an enlarged view of the XIIIa portion in FIG. 11, and FIG. 13B shows a view taken along arrow BB in FIG. 13A. Here, as shown in FIG. On the outer peripheral surface of the intermediate roll 55, a receiving portion 55r separate from the pin member 55p is formed so as to protrude at a position between adjacent pin members 55p and 55p. And as shown to FIG. 13B, this receiving part 55r is a substantially cylindrical body which has the top surface 55rt which faced the outward of the rotation radial direction Dr55 of the intermediate roll 55 at the front-end | tip. Therefore, the sheet-like member 30mf is received and held by the receiving portion 55r other than the pin member 55p. Therefore, the sheet-like member 30mf can be stably held as a whole at an appropriate position in the rotational radius direction Dr55 of the intermediate roll 55. At this time, the receiving portion 55r receives the top surface 55rt without penetrating one surface of the sheet-like member 30mf, and this also stably holds the sheet-like member 30mf in the proper position. It contributes effectively to doing.

In this example, as shown in FIG. 13A, the receiving portions 55r are provided at four locations around the pin member 55p, respectively, thereby making it possible to reliably receive the sheet-like member 30mf. It is not limited to the above four locations. For example, when the arrangement space cannot be secured, the number may be smaller than this, and conversely, when the arrangement space can be secured, the number may be larger.

Furthermore, in the example of FIG. 13B, the position of the top surface 55rt of the receiving portion 55r is located inward of the rotational radius direction Dr55 of the intermediate roll 55 from the position of the apex of the pin member 55p. This prevents the receiving portion 55r from interfering with the through-hole forming process of the vent hole h by the pin member 55p. Desirably, the top surface 55rt of the receiving portion 55r is preferably located in the vicinity of the bottom surface of the conical portion 55pa of the pin member 55p. For example, the top surface 55rt is related to the position in the rotational radius direction Dr55. It is preferable to be within a range of ± 2 mm centering on the position of the bottom surface. In this example, the top surface 55rt coincides with the bottom surface of the conical portion 55pa. Therefore, the receiving portion 55r can reliably receive the sheet-like member 30mf without substantially interfering with the penetration formation process of the vent hole h of the pin member 55p. As a result, the pin member 55p can quickly form the vent hole h with respect to the sheet-like member 30mf.

Further, in this example, the top surface 55rt of the receiving portion 55r has a perfect circular shape, and the diameter thereof is selected from a range of 2 mm to 5 mm, for example, but is not limited thereto. For example, it may be a polygon such as a regular triangle or a square, or may be a shape other than these.

On the other hand, as shown in FIG. 12, the hole 51h on the outer peripheral surface of the upstream roll 51 is provided corresponding to the pin member 55p. That is, as shown in FIG. 11, a pair of pin member groups G55p1 and G55p1 are provided side by side in the rotational direction Dc55 in the region on one side in the CD direction on the outer peripheral surface of the intermediate roll 55. Thus, a pair of hole groups G51h1 and G51h1 having a plurality of hole parts 51h in a staggered arrangement are provided side by side in the rotational direction Dc51 in the region on one side in the CD direction on the outer peripheral surface of the upstream roll 51. Yes. Similarly, as shown in FIG. 11, a pair of pin member groups G55p2 and G55p2 are arranged in the rotational direction Dc55 in the other region in the CD direction on the outer peripheral surface of the intermediate roll 55. Correspondingly, in the region on the other side in the CD direction on the outer peripheral surface of the upstream roll 51, a pair of hole groups G51h2 and G51h2 having a plurality of hole parts 51h in a staggered arrangement are provided side by side in the rotation direction Dc51. ing.

However, as described above, since the upstream roll 51 is involved in the formation of the vent hole h for one diaper in one rotation, the pair of hole groups G51h1, G51h1 (G51h2, G51h2) arranged in the rotation direction Dc51. Is one set of hole group set SG51h1 (SG51h2), only one set of such hole group set SG51h1 (SG51h2) is provided on the outer peripheral surface of the upstream roll 51.

In some cases, a heating device (not shown) such as an electric heater may be built in the intermediate roll 55 in FIG. 9, thereby heating the pin member 55 p of the intermediate roll 55. And if it does in this way, based on the heated pin member 55p, the thermoplastic resin fiber which is a constituent fiber of the continuous nonwoven fabric 30mf1 and 30mf2 of the sheet-like member 30mf can be softened. Therefore, when the pin member 55p is pushed into the sheet-like member 30mf, the fibers are easily pushed away to the surroundings, and thereby the air holes h are easily formed.

Incidentally, as an indication of heating, for example, the temperature of the pin member 55p may be set to be equal to or higher than the softening point of the thermoplastic resin and lower than the melting point. The softening point can be determined by TMA (thermomechanical analysis) of JIS K7196 (softening temperature test method by thermomechanical analysis of thermoplastic film and sheet). The melting point can be obtained as a melting peak temperature in DSC (differential scanning calorimetry) of JIS K7121 (plastic transition temperature measurement method).

On the other hand, the configuration of the downstream roll 58 in FIG. 9 is substantially the same as that of the upstream roll 51. For example, hole groups G58h1, G58h2 having the same specifications as the hole group G51h1, G51h2 on the outer peripheral surface of the upstream roll 51 are provided on the outer peripheral surface of the downstream roll 58. Then, when the sheet-like member 30mf is received from the intermediate roll 55, the pin member 55p of the intermediate roll 55 is smoothly inserted into each hole 58h of the hole group G58h1, G58h2. The sheet-like member 30mf can be received without greatly changing the shape of the vent hole h formed in the sheet-like member 30mf.

<<< CD direction tension applying step S60 >>>
As shown in FIG. 6, in the CD direction tension applying step S60, tension is applied to both sides in the CD direction with respect to the sheet-like member 30mf having the air holes h sent from the air hole forming step S50 in the upper step. And thereby, the fiber of the edge part he of the ventilation hole h of the sheet-like member 30mf is loosened.

The tension in the CD direction is applied by the CD direction tension applying device 60. 14A is an enlarged schematic plan view showing the CD direction tension applying device 60, and FIG. 14B is a view taken along the line BB in FIG. 14A.
As shown in FIG. 14A, the CD direction tension applying device 60 includes position adjusting mechanisms 60A and 60A on both sides in the CD direction. The position adjustment mechanisms 60A and 60A adjust the positions of the corresponding end portions 30mfe and 30mfe in the CD direction of the sheet-like member 30mf, respectively.

Note that the position adjustment mechanisms 60A and 60A are mirror images of each other with respect to the center line CL in the CD direction, and the basic structure is substantially the same. Therefore, only one position adjustment mechanism 60A will be described below.

As shown in FIGS. 14A and 14B, the position adjustment mechanism 60A is, for example, arranged with its outer peripheral surfaces facing each other so as to sandwich the end portion 30mfe in the CD direction of the sheet-like member 30mf from both sides in the thickness direction. A pair of rotating upper and lower nip rollers 60Ru, 60Rd, an actuator 60d for driving the pair of upper and lower nip rollers 60Ru, 60Rd around a support axis C60A in a plane having both the transport direction and the CD direction, and the nip roller A sensor 60s such as a phototube that is arranged immediately downstream of 60Ru and 60Rd and measures the position of the end 30mfe in the CD direction and outputs a measurement signal, and the actuator 60d is controlled based on the measurement signal from the sensor 60s. And a controller (not shown).

When the measurement signal indicates that the end 30mfe is located on one side in the CD direction with respect to the target position, the controller deviates between the actual position indicated by the measurement signal and the target position. The actuator 60d is controlled by a control amount obtained by multiplying a predetermined gain by a predetermined amount, and thereby the feed direction Dr60 of the pair of upper and lower nip rollers 60Ru, 60Rd is more than the current feed direction Dr60 by the amount corresponding to the control amount. Turn to the other side of the CD direction. On the other hand, when the measurement signal indicates that the end 30mfe is located on the other side in the CD direction from the target position, the controller similarly determines the actual position and the target position indicated by the measurement signal. The actuator 60d is controlled with a control amount obtained by multiplying the deviation by a predetermined gain, whereby the delivery direction Dr60 of the pair of upper and lower nip rollers 60Ru, 60Rd corresponds to the control amount more than the current delivery direction Dr60. Direct to one side of the CD direction. Then, by repeating this at a predetermined control cycle, the end 30mfe of the sheet-like member 30mf is positioned at the target position in the CD direction.

The target position is set in advance to a position where a tension in the CD direction is applied to the sheet-like member 30mf. That is, in this example, the sheet-like member 30mf has thread rubber continuums 35a, 35a... (45a, 45a...) Along the carrying direction, and the sheet-like member 30mf includes Tension is applied along the transport direction. For this reason, the sheet-like member 30mf shrinks in the CD direction due to the conveying tension. That is, the dimension in the CD direction is reduced with conveyance. In this example, the target position is set at a position outside the CD direction from the position of each end 30mfe of the sheet-like member 30mf in the contracted state. Therefore, the tension in the CD direction is applied to the sheet-like member 30mf by adjusting each end 30mfe to be located at the target position.

In this example, as described above, the pair of upper and lower nip rollers 60Ru, 60Rd perform the above-described turning operation while sandwiching the end portion 30mfe in the CD direction of the sheet-like member 30mf from both sides in the thickness direction. A tension in the CD direction is applied to the shaped member 30mf. Therefore, the “tension applying position” according to the claims, that is, the “position applying the tension in the CD direction to the sheet-like member 30mf” is a nip position P60 that is a position where the pair of upper and lower nip rollers 60Ru, 60Rd sandwich the sheet-like member 30mf. And almost the same position. Therefore, hereinafter, the nip position P60 is also referred to as “tension applying position P60”.

Here, preferably, the size relationship in the CD direction of the sheet-like member 30mf is set as follows by adjusting the target position. That is, the dimension L30mfk (FIG. 14A) in the CD direction of the sheet-like member 30mf at the tension applying position P60 related to the CD direction tension applying process S60 is the above-described air hole forming process position P51 related to the air hole forming process S50. It is preferable that the sheet-like member 30mf has a dimension L30mfh or more in the CD direction. In this way, at least when the vent hole h is formed, the size of the sheet-like member 30mf that can be reduced while being conveyed from the vent hole forming processing position P51 to the tension applying position P61 is reduced. Can be expanded to a dimension L30 mfh in the CD direction. As a result, in the CD direction tension applying step S60, tension in the CD direction can be reliably applied to the sheet-like member 30mf, and as a result, fibers at the edge portion he of the vent hole h of the sheet-like member 30mf can be reliably obtained. Can be relaxed.

In addition, the above target position adjustment may be performed using the following as a guide. That is, the target position is set so that the dimension in the CD direction of the vent hole h at the tension applying position P60 is larger than the maximum dimension L55pa in the CD direction of the conical portion 55pa of the pin member 55p in FIG. You may do it. Even in this case, at least the vent hole h is formed in the CD direction of the sheet-like member 30mf that can be reduced while being conveyed from the vent hole forming step S50 to the CD direction tension applying step S60. The CD dimension can be enlarged to L30 mfh. Therefore, in the CD direction tension applying step S60, the CD direction tension can be reliably applied to the sheet-like member 30mf, and as a result, the fibers at the edge he of the vent hole h of the sheet-like member 30mf are surely loosened. Can do.

On the other hand, in this example, as shown in FIG. 6, the tension applying position P60 of the CD direction tension applying step S60 is the air hole of the air hole forming step S50 among the above-described steps S70 to S130 corresponding to the processing step. It is provided between the position of the slit step S70, which is the processing step S70 closest to the formation processing position P51, and the vent hole formation processing position P51. As a result, a tension in the CD direction is applied to the sheet-like member 30mf in which the vent hole h has been formed at a position immediately downstream of the vent hole formation processing position P51. Therefore, from the most upstream processing step S70 among the processing steps S70 to S130 located on the downstream side of the vent hole forming processing position P51, the state of the sheet-like member 30mf is changed from the fiber at the edge he of the vent hole h. It can be in a proper state that has been loosened. Therefore, the sheet-like member 30mf can be processed with high processing accuracy in all the processing steps S75 to S130 located downstream thereof, including the slit step S70 which is the most upstream processing step S70.

Further, in the case where the intermediate roll 55 (corresponding to the first rotating body) described above with reference to FIG. 9 is a heating roll heated by the heating device as described above, the intermediate roll 55 causes the sheet-like member 30mf. In this case, it is desirable that the heating is as follows. That is, the application of the CD direction tension to the sheet-like member 30mf performed in the CD-direction tension applying step S60 is in a state where the temperature of the sheet-like member 30mf is higher than the temperature before being heated by the intermediate roll 55. Good to be done at times.
And if it becomes in this way, the fiber of the edge part he of the ventilation hole h of the sheet-like member 30mf can be loosened, and it becomes easy to loosen the said fiber by this. Instead of or in addition to the intermediate roll 55, the upstream roll 51 (corresponding to the second rotating body) or the downstream roll 58 in FIG. 9 is heated by a heating device (not shown) such as an electric heater. It may be a heated roll. And even if it does in this way, the sheet-like member 30mf can be heated with these rolls 51 and 58, Thereby, there can exist an effect similar to the above-mentioned.

<<< Slit Process S70 >>>
As shown in FIG. 6, in the slitting step S70, the sheet-like member 30mf sent from the upper CD direction tension applying step S60 is moved to the boundary position BL (FIG. 7B) between the one side region and the other side region in the CD direction. ). Thus, the abdominal band member continuum 31a in which the thread rubber continuum 35a is not cut and the back band member continuum 41a in which the thread rubber continuum 45a is not cut are aligned in the CD direction. (FIG. 6).

Such two-divided processing can be performed using the known slitter device 70 of FIG. That is, the apparatus 70 has, for example, a pair of upper and lower disk-shaped rotary blades, and divides the sheet-like member 30mf into two in the CD direction with the cutting edge on the outer peripheral edge of the rotary blade. 70 is well known. Therefore, further explanation is omitted.

<<< Interval Forming Step S75 >>>>
As shown in FIG. 6, in the interval forming step S75, the abdomen belt member continuum 31a and the back belt member continuum 41a sent from the upper slit step S70 are respectively moved outward in the CD direction. Thus, between the continuous bodies 31a and 41a in the CD direction, a size corresponding to the longitudinal distance Ld between the ventral belt member 31 and the back belt member 41 in the developed diaper 1 of FIG. A gap is formed.

In addition, about the movement to the outer side of the CD direction of the continuous body 31a of this abdominal side band member and the movement of the back side belt member continuous body 41a to the outer side of the CD direction, there are each a plurality along the conveyance path considering the above movement. It is realizable by arrange | positioning the conveyance roller (not shown), and the content is conceivable from said description. Therefore, further explanation is omitted.

<<< Ventral thread rubber cutting step S80 >>>
In the ventral side rubber thread cutting step S80, as shown in FIG. 8B, the non-fixing corresponding to the non-stretchable region AL is performed with respect to the continuous body 31a of the ventral side belt member in FIG. In the region AL1, the thread rubber continuum 35a is cut, while in the fixing area AH1 corresponding to the stretchable area AH, the thread rubber continuum 35a is not cut. As a result, the non-stretchable region AL and the stretchable region AH are formed in the continuum 31a of the ventral band member. Note that an area AL1 corresponding to the non-stretchable area AL appears at the product pitch P1 of the diaper 1 in the transport direction. Therefore, this cutting process is performed at the product pitch P1 of the diaper 1 with respect to the continuous body 31a of the ventral side belt member.

This cutting process is performed by the abdominal cutter device 80. FIG. 15A is a schematic side view of the cutter device 80, and FIG. 15B is a BB arrow view in FIG. 15A.

The abdominal cutter device 80 has a pair of upper and lower rolls 81u and 81d that are driven and rotated about a rotation axis along the CD direction, with the outer peripheral surfaces 81ua and 81da facing each other. A plurality of cutter blades C, C,... Protrude from the cutter block 84 of the outer peripheral surface 81 ua of the upper roll 81 u so as to correspond to the predetermined positions PC, PC,. 81da is a smooth surface to receive the cutter blades C, C. Further, these rolls 81u and 81d are controlled to rotate in conjunction with the conveying operation of the abdominal band member continuous body 31a, so that the aforementioned non-fixed area AL1 corresponding to the non-expandable area AL passes therethrough. Each time the cutter roll 81u rotates so that the cutter block 84 faces the non-fixed area AL1. Then, each time the non-fixed area AL1 corresponding to the non-stretchable area AL in FIG. 8A passes between the outer peripheral surfaces 81ua and 81da of the pair of rolls 81u and 81d, the non-fixed area AL1 It is pressed by the cutter blades C, C... Of the cutter block 84 of the cutter roll 81u and the outer peripheral surface 81da of the anvil roll 81d. And each thread rubber continuum 35a, 35a... Is cut at each pressed position PC.
<<< Back thread rubber cutting step S90 >>>>
As shown in FIG. 6, in the back side rubber thread cutting step S90, the back side belt member continuous body 41a sent from the upper space forming step S75 has been described with reference to FIGS. 8A and 8B. The same cutting process is performed. That is, the thread rubber continuum 45a is cut in the area AL1 corresponding to the non-stretchable area AL, and the thread rubber continuum 45a is not cut in the area AH1 corresponding to the stretchable area AH. Thereby, the non-stretchable region AL and the stretchable region AH are formed in the continuous body 41a of the back side band member. As can be seen from the above, the cutting process is substantially the same as the above-described ventral rubber thread cutting step S80, and the configuration of the back-side cutter device 90 in FIG. This is the same as that of the cutter device 80 for use. Therefore, detailed description thereof is omitted here.

<<< Absorptive main body attachment process S100 >>>
In the absorbent main body attaching step S100, as shown in FIG. 6, the continuous members 31a, 41a of the belt members sent as the intermediate product 1m from the thread rubber cutting steps S80, S90 in the upper step are separated from each other (not shown). A single-sheet absorbent main body 10 generated in the process is stretched and fixed, whereby the intermediate product 1m is a substantially ladder in which the diapers 1H, 1H,. The diaper continuous body 1Ha is used.

In addition, about the implementation | achievement of the attachment process of this absorptive main body 10, for example, the rotating drum (not shown) which has the some holding | maintenance part which adsorbed and hold | maintains the absorptive main body 10 on the outer peripheral surface along with the product pitch P1 in the rotation direction Such rotating drums are well known. Therefore, detailed description is omitted.

=== Second Embodiment ===
FIG. 16 is a schematic explanatory diagram of the manufacturing method of the second embodiment.
In the first embodiment described above, as shown in FIG. 6, the tension applying position P60 of the CD direction tension applying step S60 is located between the vent hole forming step S50 and the slit step S70 in the transport direction. In the second embodiment, as shown in FIG. 16, the tension applying position P60 in the CD direction tension applying step S60 is located on the downstream side of the slit step S70. And in the position downstream from this slit process S70, since the sheet-like member 30mf is divided | segmented into the continuous body 31a of the abdominal side belt member, and the continuous body 41a of the back side belt member, these each continuous body 31a. , 41a is mainly different in that CD direction tension applying steps S60 and S60 are provided, respectively. The other points are almost the same as those in the first embodiment. Therefore, the same components are denoted by the same reference numerals, and the description thereof is omitted.

As shown in FIG. 16, in the second embodiment, the tension applying position P60 of the CD direction tension applying step S60 for the continuum 31a of the ventral side belt member is the same as the abdominal side rubber thread cutting step S80 and the absorbent main body in the conveying direction. The tension applying position P60 of the CD direction tension applying step S60 for the back belt member continuous body 41a is located between the back side rubber thread cutting step S90 and the absorbent main body in the conveying direction. It is located between the attachment step S100. Then, CD tension applying devices 60 and 60 are provided at the tension applying positions P60 and P60, respectively. That is, the CD direction tension applying device 60 for the continuum 31a of the ventral band member has the position adjusting mechanisms 60A and 60A on both sides in the CD direction as described above, and the ventral band is formed by the mechanisms 60A and 60A. A tension in the CD direction is applied to the continuous member 31a. Similarly, the CD direction tension applying device 60 for the continuous body 41a of the back side band member also has position adjusting mechanisms 60A and 60A on both sides in the CD direction, and the back side band member is continuous by the mechanisms 60A and 60A. A tension in the CD direction is applied to the body 41a. The configurations of the position adjusting mechanisms 60A, 60A,... Are the same as those described in the first embodiment. Therefore, detailed description is omitted.

In both the second embodiment of FIG. 16 and the first embodiment of FIG. 6, the ventral belt member is located at a position upstream of the tension applying position P60 in the CD direction tension applying step S60 in the transport direction. In addition, there is no step of fixing another member such as the absorbent main body 10 to each of the continuous bodies 31a and 41a of the back side band member or the sheet-like member 30mf. That is, in these second and first embodiments, before the separate member is fixed, tension in the CD direction is applied to each of the continuums 31a, 41a or the sheet-like member 30mf in which the vent holes h have been formed. It is like that.
Therefore, according to the second and first embodiments, the trouble that occurs when the tension in the CD direction is applied after the separate member is fixed, that is, the tension is received by the separate member, so that the tension is It can be effectively prevented that the continuity 31a, 41a or the sheet-like member 30mf is hardly transmitted and the action of loosening the fibers of the edge he of the vent hole h is reduced.

Incidentally, in some cases, the production line of the second embodiment shown in FIG. 16 is not limited to each of the CD direction tension applying steps S60 and S60 for the abdominal band member continuum 31a and the back side band member continuum 41a, You may have CD direction tension | tensile_strength provision process S60 for the sheet-like members 30mf described in 1st Embodiment of FIG.

=== Third Embodiment ===
FIG. 17 is a schematic explanatory diagram of the manufacturing method of the third embodiment.
In the first embodiment described above, as shown in FIG. 6, the CD direction tension applying step S60 is provided only on the downstream side in the transport direction from the vent hole forming process position P51 of the vent hole forming step S50, and the upstream side Although not provided on the side, the third embodiment is mainly different in that the same step S60 is provided not only on the downstream side but also on the upstream side as shown in FIG. The other points are almost the same as those in the first embodiment. Therefore, the same components are denoted by the same reference numerals, and the description thereof is omitted.

As shown in FIG. 17, in the third embodiment, the position substantially upstream from the vent hole forming process position P51 in the vent hole forming step S50 in the transport direction is substantially the same as that described in the first embodiment. A CD direction tension applying device 60 having the configuration is arranged. In other words, the apparatus 60 has position adjustment mechanisms 60A and 60A having substantially the same configuration as described above on both sides in the CD direction, and the position adjustment mechanisms 60A and 60A allow the sheet in which the vent hole h is not formed. A tension in the CD direction is applied to the member 30mf. As a result, at the vent hole forming process position P51 in the vent hole forming step S50, the vent hole h is formed in the sheet-like member 30mf with the tension in the CD direction applied.

Here, when the vent hole h is formed in this way, the formation accuracy of the vent hole h can be improved by applying tension in the CD direction to the sheet-like member 30mf. Details are as follows.

First, as described above, the sheet-like member 30mf has thread rubber continuums 35a and 45a, and when the sheet-like member 30mf is conveyed in the conveyance direction, A tension is applied to the sheet-like member 30mf in a direction along the conveyance direction. Therefore, the sheet-like member 30mf can be reduced in width by the amount that the sheet-like member 30mf is extended in the carrying direction by the carrying tension. That is, it can shrink in the CD direction. Then, based on this shrinkage, the fibers of the sheet-like member 30mf as a whole move from the end side in the CD direction to the center side, and as a result, the sheet-like member 30mf has a fiber distribution density (g / cm ³ ). Will be biased with respect to the CD direction. For example, the density in the center part in the CD direction is higher than that in the end part. If the air holes h are formed in the improper sheet-like member 30mf having such a density, the formation process of the air holes h becomes unstable, and the formation accuracy of the air holes h may be lowered. However, with respect to this point, according to the manufacturing method of the third embodiment, the vent hole h is formed in the sheet-like member 30mf in a state where the tension in the CD direction is applied to the sheet-like member 30mf. Therefore, at the time of forming the vent hole h, the sheet-like member 30mf is changed from an inappropriate state in which the density of the fiber distribution is biased in the CD direction to an appropriate state in which the density bias is reduced. The formation accuracy of the vent hole h can be increased.

=== Other Embodiments ===
As mentioned above, although embodiment of this invention was described, said embodiment is for making an understanding of this invention easy, and is not for limiting and interpreting this invention. Further, the present invention can be changed or improved without departing from the gist thereof, and needless to say, the present invention includes equivalents thereof. For example, the following modifications are possible.

In the above-described embodiment, the thread rubber continuums 35a and 45a are illustrated as an example of the continuous elastic member, but the present invention is not limited thereto. For example, a continuous rubber band may be used.

In the above-described embodiment, as shown in the enlarged view of the main part in FIG. 10, the pin member 55p of the intermediate roll 55 has the conical part 55pa and the cylindrical part 55pb, but this is not a limitation. For example, instead of the conical portion 55pa, a conical portion having a polygonal section such as a triangular pyramid or a quadrangular pyramid may be provided. You may do it.

In the above-described embodiment, the sheet-like member 30mf as the intermediate product 1m is wound around the upstream roll 51 and the intermediate roll 55 of the vent hole forming device 50 in the vent hole forming step S50 as shown in FIG. Not limited to this. That is, the sheet-like member 30mf may be passed between the rolls 51 and 55 without being wound around either the upstream roll 51 or the intermediate roll 55.

In above-mentioned embodiment, although the 3 piece type disposable diaper 1 was illustrated as an example of an absorbent article, it is not restricted to this at all. For example, when manufacturing the sheet-like member used as the material of a 2 piece type disposable diaper, you may apply the manufacturing method and manufacturing apparatus of the sheet-like member of this invention. Incidentally, the two-piece type disposable diaper has, for example, an exterior sheet having an abdominal side, a crotch part, and a back side as a first component, and is fixed to the skin side surface of the exterior sheet. Is a type of diaper having a second part. And in that case, when the continuous sheet of the above-mentioned exterior sheet is formed with the two-layered nonwoven fabric, when forming a hole in the two-layered nonwoven fabric or cutting the elastic member between the two-layered nonwoven fabric, The sheet-like member manufacturing method and manufacturing apparatus of the present invention will be used.
Further, the two-piece diaper may be a so-called tape-type disposable diaper. The tape-type disposable diaper is a type that uses a fastening tape to connect the abdomen side part covering the wearer's torso from the abdomen side and the back side part covering the abdomen part from the back side. It is a diaper.
Further, the absorbent article is not limited to the disposable diaper 1. That is, if it is an absorptive article manufactured using a nonwoven fabric as a material, the manufacturing method and manufacturing apparatus of the sheet-like member of the present invention are applicable in the manufacture. Therefore, the concept of the absorbent article includes a urine absorbing pad and a sanitary napkin.

In the above-described embodiment, as an example of the CD direction tension applying device 60 used in the CD direction tension applying step S60 of FIGS. 6 and 16, the end portions 30mfe and 30mfe of the sheet-like member 30mf are respectively provided on both sides in the CD direction. Although an apparatus having two position adjusting mechanisms 60A and 60A for adjusting the position of the position is exemplified, the present invention is not limited to this. For example, as the apparatus 60, a roll crown having a minus crown (concave shape), that is, a roll (not shown) having a diameter in the center in the CD direction smaller than the diameter in both ends in the CD direction may be used. . In that case, the roll is supported so as to be rotatable about a rotation axis along the CD direction, and the sheet-like member 30mf is wound around the outer peripheral surface of the roll. The sheet-like member 30mf is pulled on both sides in the CD direction based on the peripheral speed difference between the center portion and both end portions, whereby a tension in the CD direction is applied to the sheet-like member 30mf. .

In the above-described embodiment, the position of the vent hole forming step S50 is set on the upstream side in the transport direction from the positions of the slit step S70, the ventral side rubber thread cutting step S80, and the back side rubber thread cutting step S90. , But not limited to this. For example, the position of the vent hole forming step S50 may be set downstream of the position of the slitting step S70 or the respective positions of the ventral side rubber thread cutting step S80 and the back side rubber thread cutting step S90 in the transport direction. .

1 disposable diapers (absorbent articles),
1a diaper continuum, 1Ha continuum diaper continuum,
1m intermediate product,
10 Absorbent body,
10LG part, 10ea end, 10eb end,
11 Absorber, 11c Absorbent core,
13 Top sheet, 15 Back sheet,
15a leakage prevention sheet, 15b exterior sheet,
16 Rubber thread,
30 mf sheet-like member (composite sheet), 30 mfe end,
30 mf1 continuous nonwoven fabric (first nonwoven fabric), 30 mf2 continuous nonwoven fabric (second nonwoven fabric),
30mf2p1 part, 30mf2p2 part,
31 a ventral band member, 31a a continuum of ventral band members,
31e end,
31s Absorbent body non-existing part,
32 non-woven fabric, 32Le end,
33 non-woven fabric, 33B folded portion,
35 thread rubber (elastic member), 35eu part,
35a thread rubber continuum (elastic member), 35aed end, 35aedn part,
41 dorsal belt member, 41a continuum of dorsal belt member,
42 non-woven fabric, 42Le end,
43 non-woven fabric, 43B folded portion,
45 Rubber thread (elastic member),
45a A thread rubber continuum (elastic member),
50 Vent hole forming device (through hole forming device),
51 upstream roll (second rotating body), 51h hole,
55 Intermediate roll (first rotating body),
55p pin member (push-in member), 55pa conical part, 55pb cylindrical part,
55r receiving portion, 55rt top surface,
58 downstream roll, 58h hole,
60 CD direction tension applying device, 60A position adjusting mechanism,
60Ru nip roller, 60Rd nip roller,
60d actuator, 60s sensor,
70 slitter device,
80 Ventral cutter device,
81u cutter roll, 81ua outer peripheral surface,
81d anvil roll, 81da outer peripheral surface,
84 Cutter block,
90 Cutter device for the back side,
h Ventilation hole (through hole), he edge, C cutter blade, B burr,
AH stretchable area, AH1 fixed area,
AL non-stretchable area, AL1 non-fixed area,
AU upper region, AD lower region, ADc central region, ADe end side region,
BH waist opening, LH leg opening, LG leg gather,
CL1 center position, CL10 predetermined position, CL center line, C60A support shaft,
SS side seal part,
PC predetermined position, TC trace, BL boundary position,
Gh31 vent group, Rh31 vent row,
Gh41 vent group, Rh41 vent row,
G51h1 hole group, G51h2 hole group,
G55p1 pin member group, G55p2 pin member group,
G58h1 hole group, G58h2 hole group,
SG51h1 hole group set, SG51h2 hole group set,
SG55p1 pin member group set, SG55p2 pin member group set,
R51 first transport route, R55 second transport route, R58 third transport route,
P51 closest approach position (vent hole forming process position, through hole forming process position), P55 closest approach position,
P60 Pinch position (tension applying position),
S50 vent hole forming step (through hole forming step),
S60 CD direction tension applying step,
S70 Slit process (machining process),
S75 interval forming step (processing step),
S80 ventral thread rubber cutting step (processing step),
S90 Back thread rubber cutting process (processing process),
S100 absorbent main body attachment process (separate member fixing process, processing process),
S110 Folding process (processing process),
S120 side seal process (processing process),
S130 cutting process (processing process),

Claims (8)

1. A method for producing a sheet-like member having a plurality of through holes formed from a composite sheet continuous in a predetermined direction,
   In a stretched state in the predetermined direction, between the first nonwoven fabric continuous in the predetermined direction and the second nonwoven fabric continuous in the predetermined direction while being arranged to overlap the first nonwoven fabric in the thickness direction of the composite sheet A conveying step of conveying the composite sheet, in which the plurality of elastic members along the predetermined direction are inserted and fixed in a state of being arranged in a CD direction intersecting the predetermined direction, with the predetermined direction as a conveying direction;
   A through hole that forms the through hole penetrating in the thickness direction in the composite sheet by pushing a pressing member in the thickness direction into a position between the elastic members adjacent in the CD direction in the composite sheet. Forming process;
   A CD direction tension applying step of applying tension in the CD direction to the composite sheet at a position downstream of the through hole forming processing position for forming the through hole in the through hole forming step;
   And a processing step of processing the composite sheet at a position downstream of the tension applying position where the tension is applied in the CD direction tension applying step in the transport direction. A manufacturing method of a sheet-like member.
2. It is a manufacturing method of the sheet-like member concerning the absorptive article according to claim 1,
   A plurality of the processing steps are provided on the downstream side in the transport direction from the through hole forming processing position,
   The tension applying position of the CD direction tension applying step is located between the through hole forming processing position and the position of the processing step closest to the through hole forming processing position among the plurality of processing steps. The manufacturing method of the sheet-like member which concerns on the absorbent article characterized by the above-mentioned.
3. It is a manufacturing method of the sheet-like member concerning the absorptive article according to claim 1 or 2,
   According to the absorbent article, there is no separate member fixing step of fixing another member to the composite sheet at a position upstream of the tension applying position in the CD direction tension applying step in the transport direction. A manufacturing method of a sheet-like member.
4. A method for producing a sheet-like member according to any one of claims 1 to 3,
   The first nonwoven fabric and the second nonwoven fabric both include thermoplastic resin fibers,
   In the through-hole forming step, the pushing member formed to protrude on the outer peripheral surface of the first rotating body rotating along the transport direction is formed on the outer peripheral surface of the second rotating body rotating along the transport direction. When inserted into the hole, the pushing member is pushed into the composite sheet to form the through hole,
   At least one of the first rotating body and the second rotating body is heated, and the composite sheet is heated by the rotating body,
   In the CD direction tension applying step, the CD-direction tension is applied to the composite sheet in a state higher than the temperature of the composite sheet before being heated by the rotating body. The manufacturing method of the sheet-like member which concerns on this.
5. It is a manufacturing method of the sheet-like member concerning the absorptive article according to any one of claims 1 to 4,
   The size of the composite sheet in the CD direction at the tension applying position is equal to or larger than the size of the composite sheet in the CD direction at the through hole forming processing position. Manufacturing method.
6. A method for manufacturing a sheet-like member according to any one of claims 1 to 5,
   In the CD direction tension applying step, the tension in the CD direction is applied so that the dimension in the CD direction of the through hole at the tension applying position is larger than the size of the pushing member in the CD direction. A method for producing a sheet-like member according to an absorbent article.
7. It is a manufacturing method of the sheet-like member concerning the absorptive article according to any one of claims 1 to 6,
   A CD direction tension applying step for applying tension in the CD direction to the composite sheet on the upstream side in the transport direction from the through-hole forming processing position;
   In the through-hole forming step, the through-hole is formed in the composite sheet in a state where the tension in the CD direction is applied. A method for manufacturing a sheet-like member according to an absorbent article.
8. An apparatus for producing a sheet-like member having a plurality of through holes formed from a composite sheet continuous in a predetermined direction,
   In a stretched state in the predetermined direction, between the first nonwoven fabric continuous in the predetermined direction and the second nonwoven fabric continuous in the predetermined direction while being arranged to overlap the first nonwoven fabric in the thickness direction of the composite sheet A plurality of elastic members along the predetermined direction, a conveying device that conveys the composite sheet, which is inserted and fixed in a state of being arranged in a CD direction intersecting the predetermined direction, with the predetermined direction as a conveying direction;
   A through hole that forms the through hole penetrating in the thickness direction in the composite sheet by pushing a pressing member in the thickness direction into a position between the elastic members adjacent in the CD direction in the composite sheet. A forming device;
   A CD direction tension applying device that applies tension in the CD direction to the composite sheet at a position downstream of the through hole forming processing position in which the through hole forming device forms the through hole in the composite sheet in the transport direction. When,
   The CD direction tension applying device has a processing device for processing the composite sheet at a position downstream of the tension applying position for applying the tension in the CD direction to the composite sheet. The manufacturing apparatus of the sheet-like member which concerns on the absorbent article characterized.

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