WO2018055703A1 - Device for forming holes in sheet-like member relating to absorbent article and hole formation method - Google Patents

Abstract

A device 50 for forming multiple holes h in a sheet-like member 1m by pushing multiple push-in members 55p, which project outward from an outer peripheral surface of a rotary body 52 which rotates about a rotational axis C52 along a CD direction and which are disposed as separate members from the rotary body 52, into the sheet-like member 1m being conveyed along a rotation direction Dc52 of the rotary body 52. The rotary body 52 has: a center-side part 52in including the rotational axis C52; an outer peripheral-side part 52ex which is disposed outward of the center-side part 52in in a rotation radius direction Dr52 of the rotary body 52 and which holds the push-in members 55p in such a manner that the push-in members 55p come into contact with the center-side part 52in; and a heating body 54 which is disposed inside the center-side part 52in and which heats the push-in members 55p across the center-side part 52in. A gap G52 is formed in the rotation radius direction Dr52 between the center-side part 52in and the outer peripheral-side part 52ex.

Description

Hole forming device and sheet forming method for sheet-like member related to absorbent article

The present invention relates to a hole forming device and a hole forming method for a sheet-like member related to an absorbent article such as a disposable diaper.

Conventionally, in a production line of absorbent articles such as disposable diapers that absorb excrement such as urine, a plurality of holes are formed in a sheet-like member such as a nonwoven fabric as a material for the purpose of imparting air permeability to the absorbent article. May be performed. As an example of the forming method, Patent Document 1 discloses that the sheet-like member is formed by pushing a plurality of pin members protruding from the outer peripheral surface of the rotating rotating body into the sheet-like member in the thickness direction. It is disclosed that a hole is formed in the above.

JP 2003-154866 A

Also, although it is conceivable to heat the pin member for the purpose of facilitating the formation of the hole, the above-mentioned Patent Document 1 does not describe the heating structure.

With regard to this point, as such a heating structure, for example, a heating element is built in the central portion of the rotating body, and the amount of heat generated by the heating element is transmitted from the inside to the outside in the rotational radius direction of the rotating body. It is conceivable to heat.

However, in this method, heat is greatly dissipated not only from the pin member but also from the outer peripheral surface of the rotating body, and as a result, the heating efficiency of the pin member may be reduced.

The present invention has been made in view of the conventional problems as described above, and its purpose is to push a pushing member such as a heated pin member into a sheet-like member related to an absorbent article to form a hole. When forming, it exists in suppressing the fall of the heating efficiency of a pushing member.

The main invention for achieving the above object is:
A plurality of pushing members provided as separate members from the rotating body while being projected outside the outer peripheral surface of the rotating body rotating around the rotation axis along the CD direction are conveyed along the rotating direction of the rotating body. An apparatus for forming a plurality of holes in the sheet-like member by pushing into the sheet-like member,
The rotating body is provided on a center side portion including the rotating shaft, and on the outer side in the rotational radius direction of the rotating body with respect to the center side portion, and the pressing member so that the pressing member abuts on the center side portion. An outer peripheral side portion for holding the heating member, and a heating element that is provided in the central side portion and heats the pushing member through the central side portion,
The hole forming device for a sheet-like member according to the absorbent article, wherein a gap in the rotational radius direction is provided between the center side portion and the outer peripheral side portion.
Also,
A method of forming a plurality of holes in a sheet-like member according to an absorbent article,
Rotating the rotating body around a rotation axis along the CD direction;
The sheet is formed by pushing a plurality of pushing members provided so as to protrude outside the outer peripheral surface of the rotating body as members separate from the rotating body into a sheet-like member conveyed along the rotation direction of the rotating body. Forming a plurality of holes in the shaped member,
The rotating body is provided on a center side portion including the rotating shaft, and on the outer side in the rotational radius direction of the rotating body with respect to the center side portion, and the pressing member so that the pressing member abuts on the center side portion. An outer peripheral side portion for holding the heating member, and a heating element that is provided in the central side portion and heats the pushing member through the central side portion,
It is the hole part formation method of the sheet-like member which concerns on the absorbent article, The clearance gap of the said rotation radial direction is provided between the said center side part and the said outer peripheral side part.
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, when a hole is formed by pushing a pushing member such as a heated pin member into the sheet-like member related to the absorbent article, it is possible to suppress a decrease in heating efficiency of the pushing member.

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 a schematic plan view of 1m of intermediate products before the process by the hole formation apparatus 50 of this embodiment. It is a schematic plan view of the intermediate product 1m after the processing. It is a schematic side view of the hole forming device 50 showing a partial configuration in a sectional view. FIG. 6 is a partially enlarged view taken along arrow VI-VI in FIG. 5. It is explanatory drawing of the arrangement pattern of the pin member 55p in the outer peripheral surface 52s of the intermediate roll 52. FIG. 3 is a schematic longitudinal sectional view of an intermediate roll 52. FIG. It is the IX section enlarged view in FIG. It is a schematic explanatory drawing of the structure which provided the coil spring 55cs as an elastic member between the flange part 55pf and the outer peripheral side part 52ex of the pin member 55p. It is an enlarged view of the XI part in FIG. FIG. 12 is a view taken along arrow XII-XII in FIG. 11. It is explanatory drawing of an example of the structure which integrated the receiving part 55prs in the cylindrical part 55pb of the pin member 55p. It is explanatory drawing of the arrangement pattern of the hole part 51h in the outer peripheral surface 51s of the upstream roll 51. FIG.

At least the following matters will become apparent from the description of the present specification and the accompanying drawings.
A plurality of pushing members provided as separate members from the rotating body while being projected outside the outer peripheral surface of the rotating body rotating around the rotation axis along the CD direction are conveyed along the rotating direction of the rotating body. An apparatus for forming a plurality of holes in the sheet-like member by pushing into the sheet-like member,
The rotating body is provided on a center side portion including the rotating shaft, and on the outer side in the rotational radius direction of the rotating body with respect to the center side portion, and the pressing member so that the pressing member abuts on the center side portion. An outer peripheral side portion for holding the heating member, and a heating element that is provided in the central side portion and heats the pushing member through the central side portion,
The hole forming device for a sheet-like member according to the absorbent article, wherein a gap in the rotational radius direction is provided between the center side portion and the outer peripheral side portion.

According to the hole forming device for a sheet-like member according to such an absorbent article, the pushing member is held by the outer peripheral side portion so as to abut on the central side portion. Therefore, the amount of heat generated from the heating element in the central side portion is quickly transferred to the pushing member, whereby the pushing member is quickly heated. Further, the outer peripheral portion is present outside the central portion with a gap therebetween, and the central portion and the outer peripheral portion are thermally insulated by the gap with high heat insulation. For this reason, heat radiation from the outer peripheral side portion to the outside is reduced, whereby heat radiation from the rotating body can be reduced as a whole. And as a result, the fall of the heating efficiency of a pushing member can be suppressed.

A hole forming device for a sheet-like member according to such an absorbent article,
It is desirable to push the pushing member into the sheet-like member while holding the sheet-like member on the rotating body so that there is a gap between the sheet-like member and the outer peripheral side portion.

According to the hole forming device for a sheet-like member according to such an absorbent article, there is a gap between the sheet-like member and the outer peripheral portion, that is, the sheet-like member is separated from the outer peripheral portion. is doing. Accordingly, heat input from the outer peripheral side portion to the sheet-like member can be suppressed, and as a result, thermal damage of the sheet-like member due to heat input from the outer peripheral side portion can be suppressed.

A hole forming device for a sheet-like member according to such an absorbent article,
A receiving portion that can be received without penetrating the sheet-like member at a position on the outer side in the rotational radial direction with respect to the outer peripheral surface of the outer peripheral side portion and at a position on the inner side in the rotational radial direction with respect to the tip of the pushing member. It is desirable that the rotating body be held.

According to the hole forming device for a sheet-like member according to such an absorbent article, the receiving part receives the sheet-like member at a position outside the outer peripheral surface of the outer peripheral side portion in the rotational radius direction. Therefore, a gap can be reliably provided between the sheet-like member and the outer peripheral side portion.

A hole forming device for a sheet-like member according to such an absorbent article,
The receiving portion is separate from the pushing member, and is disposed at a position different from the placement position of the pushing member on the outer peripheral surface of the outer peripheral side portion,
The thermal conductivity (W / (m · K)) of the receiving portion is the thermal conductivity (W / (m · K)) of the pushing member and the thermal conductivity (W / (m · K) of the outer peripheral portion. Smaller than)).

According to the hole forming device for a sheet-like member according to such an absorbent article, the thermal conductivity of the receiving portion is smaller than the thermal conductivity of the pushing member and the outer peripheral side portion. Therefore, large heat input from the push-in member to the sheet-like member can be ensured while reducing heat input from the receiving portion to the sheet-like member. And thereby, the formability of the hole part by a pushing member can be improved, suppressing the thermal damage of the sheet-like member in a receiving part.

A hole forming device for a sheet-like member according to such an absorbent article,
The pushing member is provided at a distal end portion to be pushed into the sheet-like member, a proximal end portion located on the inner side in the rotational radius direction from the distal end portion, and an inner side in the rotational radius direction from the proximal end portion. And a flange portion protruding outward from the outer peripheral surface of the base end portion,
The outer peripheral portion has a first through hole through which the distal end portion and the base end portion can be inserted, and the flange portion that cannot be inserted into the first through hole is formed between the central side portion and the outer peripheral side portion. It is desirable that the push-in member is held at the center side portion by being inserted into the gap.

According to the hole forming device for a sheet-like member according to such an absorbent article, the pushing member can be reliably held on the center side portion based on the flange portion provided in the pushing member.

A hole forming device for a sheet-like member according to such an absorbent article,
A receiving portion that can be received without penetrating the sheet-like member at a position on the outer side in the rotational radial direction with respect to the outer peripheral surface of the outer peripheral side portion and at a position on the inner side in the rotational radial direction with respect to the tip of the pushing member. Held by the rotating body,
The receiving portion is separate from the pushing member, and is disposed at a position different from the placement position of the pushing member on the outer peripheral surface of the outer peripheral side portion,
The receiving portion includes a base end portion that comes into contact with the sheet-like member, a flange portion that is provided on the inner side in the rotational radius direction than the base end portion, and projects outward from the outer peripheral surface of the base end portion. Have
The outer peripheral portion has a second through hole through which the base end portion of the receiving portion can be inserted, and the flange portion that cannot be inserted into the second through hole is formed between the center side portion and the outer peripheral side portion. It is desirable that the receiving portion is held by the central portion by being inserted into the gap.

According to the hole forming device for a sheet-like member related to such an absorbent article, the receiving portion can be reliably held on the center side portion based on the flange portion provided in the receiving portion.

A hole forming device for a sheet-like member according to such an absorbent article,
The first through hole is formed in a size such that the base end portion of the receiving portion can be inserted and the flange portion of the receiving portion cannot be inserted,
It is desirable that the second through hole be formed in a size that allows the distal end portion and the proximal end portion of the pushing member to be inserted, and prevents the flange portion of the pushing member from being inserted.

According to the hole forming device for a sheet-like member according to such an absorbent article, the receiving portion can be held in the first through hole for holding the pushing member, and the second through hole for holding the receiving portion can be held. The pushing member can be held. Therefore, the arrangement pattern of these pushing members and receiving parts can be freely changed by appropriately changing the arrangement positions of the pushing members and receiving parts. And thereby, the freedom degree of the setting of the arrangement pattern of the hole part which a pushing member forms can be raised.

A hole forming device for a sheet-like member according to such an absorbent article,
When the portion including the distal end portion in the pushing member is a distal end side portion and the portion including the flange portion is a root side portion, the portion held by the center side portion via the flange portion is used. It is desirable that the tip side portion is configured to be detachable with respect to the root side portion.

According to the hole forming device for a sheet-like member related to such an absorbent article, the distal end side portion can be removed from the base side portion while the proximal end portion of the pushing member is held by the central side portion. It is. Therefore, even when the tip side portion is worn or the like and the formability of the hole is lowered, only the tip side portion of the pushing member having such a problem can be selectively replaced with a new tip side portion. . Therefore, it is possible to reduce the work load of the pressing member maintenance.

A hole forming device for a sheet-like member according to such an absorbent article,
It is desirable that a gap be provided between the inner peripheral surface of the first through hole and the outer peripheral surface of the base end portion of the pushing member.

According to the hole forming device for a sheet-like member related to such an absorbent article, heat transfer from the pushing member to the outer peripheral portion is suppressed based on the gap. Therefore, it is possible to further suppress a decrease in heating efficiency of the pushing member.

A hole forming device for a sheet-like member according to such an absorbent article,
On the outer peripheral surface of the outer peripheral side portion, an arrangement area where the plurality of pushing members are arranged in a predetermined pattern and a non-arrangement area where the pushing members are not arranged are set side by side in the rotation direction,
The non-arrangement region is provided with a planar member having a top surface facing outward in the rotational radius direction, and the top surface is more in the rotational radius direction than the outer peripheral surface of the outer peripheral portion. Located outside the
The thermal conductivity (W / (m · K)) of the planar member is the thermal conductivity (W / (m · K)) of the pushing member and the thermal conductivity (W / (m · K) of the outer peripheral side portion. Smaller than K)).

According to the hole forming device for a sheet-like member according to such an absorbent article, the sheet-like member can be separated from the outer peripheral surface portion by contacting the sheet-like member. Moreover, the thermal conductivity of the planar member is smaller than the thermal conductivity of the pushing member and the outer peripheral side portion. Therefore, large heat input from the pushing member to the sheet-like member can be ensured while reducing heat input from the planar member to the sheet-like member. And thereby, the formability of the hole in the pushing member can be enhanced while suppressing thermal damage of the sheet-like member due to contact with the planar member.

A hole forming device for a sheet-like member according to such an absorbent article,
The pushing member has a distal end portion that is pushed into the sheet-like member, and a proximal end portion that is located on the inner side in the rotational radius direction than the distal end portion,
A receiving portion that can be received without penetrating the sheet-like member at a position on the outer side in the rotational radial direction with respect to the outer peripheral surface of the outer peripheral side portion and at a position on the inner side in the rotational radial direction with respect to the tip of the pushing member. It is desirable that the base end portion is integrally provided.

According to the hole forming device for a sheet-like member related to such an absorbent article, since the receiving portion is provided integrally with the proximal end portion of the pushing member, the receiving portion is located near the pushing member. The sheet-like member is received. Therefore, it is possible to reliably provide a gap between the sheet-like member and the outer peripheral portion even in the vicinity where the sheet-like member is assumed to be closest to the outer peripheral portion.

A hole forming device for a sheet-like member according to such an absorbent article,
The outer peripheral side portion is a cylindrical member that covers the outer peripheral surface of the central side portion over the entire circumference in the circumferential direction,
The outer peripheral side portion is preferably fixed coaxially to the central side portion via fixing members provided at both ends in the CD direction.

According to the hole forming device for a sheet-like member related to such an absorbent article, the center side portion and the outer peripheral side portion are fixed via the fixing members provided at both ends in the CD direction. Yes. Therefore, the gap between the center side portion and the outer peripheral side portion does not substantially cause a problem of gap formation inhibition such as the fixing member blocking the gap at the center position in the CD direction. Can be provided. Therefore, the amount of heat released from the outer peripheral portion can be reliably reduced based on the gap.

Also,
A method of forming a plurality of holes in a sheet-like member according to an absorbent article,
Rotating the rotating body around a rotation axis along the CD direction;
The sheet is formed by pushing a plurality of pushing members provided so as to protrude outside the outer peripheral surface of the rotating body as members separate from the rotating body into a sheet-like member conveyed along the rotation direction of the rotating body. Forming a plurality of holes in the shaped member,
The rotating body is provided on a center side portion including the rotating shaft, and on the outer side in the rotational radius direction of the rotating body with respect to the center side portion, and the pressing member so that the pressing member abuts on the center side portion. An outer peripheral side portion for holding the heating member, and a heating element that is provided in the central side portion and heats the pushing member through the central side portion,
It is the hole part formation method of the sheet-like member which concerns on the absorbent article, The clearance gap of the said rotation radial direction is provided between the said center side part and the said outer peripheral side part.

According to the hole forming device for a sheet-like member related to such an absorbent article, the same effects as those of the hole forming device described above can be achieved.

=== This Embodiment ===
The hole forming device 50 and the hole forming method for the sheet-like member 1m according to the absorbent article of the present embodiment are used, for example, in a production line for the disposable diaper 1 as an example of the absorbent article. 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.
2 and 3 show the diaper 1 in a state where it is virtually spread with no contraction force due to the elastic members 16, 35, and 45 described later for imparting stretchability to the diaper 1. ing.

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 expand and contract in the vertical direction may be provided in each of the portions 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 elastic member 16 such as rubber thread 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 or the like. 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. The back belt member 41 is formed by joining the non-woven fabrics 42 and 43 in two layers. 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 two nonwoven fabrics 32 and 33 (42 and 43) which concern on the ventral | abdominal band member 31 (41), several elastics, such as a thread rubber along a horizontal direction, are provided. The members 35, 35... (45, 45...) Are inserted and aligned in the vertical direction, and are bonded and fixed to the nonwoven fabrics 32 and 33 (42, 43) with a hot melt adhesive or the like while being expanded in the horizontal direction. . And thereby, the stretchability of the horizontal direction is provided to the ventral side belt member 31 (41). Further, in this example, as shown in FIG. 2, the part of the portion overlapping the absorbent body 11 (for example, the central part in the lateral direction) in the ventral band member 31 (41) causes wrinkles of the absorbent body 11. The elastic member 35 (45) is made non-continuous for the purpose of preventing it, and thus, the stretchability is not given to this portion, but this is not restrictive.

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.

Further, as shown in FIG. 2, portions 31 s (41 s) where the absorbent main body 10 is not superimposed on both sides in the lateral direction of the ventral band member 31 (41) (hereinafter, the absorbent main body non-existing portion 31 s ( 41s)), the absorbent main body non-existing portion 31s (41s) has a plurality of ventilation holes h (through the non-existing portion 31s (41s) for the purpose of improving the air permeability. h) are discretely formed in a predetermined arrangement pattern, and as a result, these vent holes h (h) form a vent group Gh31 (Gh41) as a group of vent holes h. In other words, in this example, a plurality of vent holes h, h... (In the portions between the elastic members 35, 35 (45, 45) arranged 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.

Further, in this example, the spunbond nonwoven fabric is used for both 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. 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. The hole forming device 50 of this embodiment is responsible for one step.

4A and 4B are schematic plan views of the intermediate product 1m showing processing performed by the hole forming device 50 of the present embodiment. 4A shows the intermediate product 1m before processing, and FIG. 4B shows the intermediate product 1m after processing. FIG. 5 is a schematic side view of the hole forming device 50 showing a partial configuration (upstream roll 51 and downstream roll 59) in cross-sectional view. Further, FIG. 6 is a partially enlarged view taken along arrow VI-VI in FIG. In FIG. 5 and FIG. 6, a receiving portion 55r, which will be described later, is not shown for the purpose of preventing complication of the drawings.

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.

As can be seen by comparing the state before the treatment in FIG. 4A and the state after the treatment in FIG. 4B, the hole forming device 50 is an intermediate product 1m that serves as a base material for both the ventral belt member 31 and the back belt member 41. On the other hand, the above-described vent holes h, h. 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. 4A, the form of the intermediate product 1m at the time when it is sent from the upper process to the hole forming device 50 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 1m integrally connected in the CD direction. Yes.

More precisely, the sheet-like member 1m has a size in the CD direction corresponding to an 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 back belt member 41. Continuous sheet 1mw1 of nonwoven fabric, and continuous sheet 1mw2 of the size in the CD direction corresponding to the added value of the longitudinal dimension of nonwoven fabric 33 of ventral belt member 31 and the longitudinal dimension of nonwoven fabric 43 of backside belt member 41 And have. And these continuous sheets 1mw1 and 1mw2 are joined by the hot-melt-adhesive etc. in the state of the two sheets piled up in the thickness direction. In addition, between the continuous sheets 1mw1 and 1mw2, the plurality of elastic member continuous bodies 35a and 45a to be the plurality of elastic members 35 and 45 are continuously extended in the conveying direction along the conveying direction. However, it is inserted in a state of being aligned in the CD direction and is fixed to each of the continuous sheets 1mw1 and 1mw2. Furthermore, one continuous sheet 1mw2 of the two continuous sheets 1mw1 and 1mw2 has a larger size in the CD direction than the other continuous sheet 1mw1, so that the former continuous sheet 1mw2 is The latter has portions 1mw2p1 and 1mw2p2 protruding from the other continuous sheet 1mw1 to both sides in the CD direction. The protruding portions 1mw2p1 and 1mw2p2 are folded inward in the CD direction, thereby forming portions corresponding to the aforementioned folded portions 33B and 43B.

In the hole forming device 50, a pair of ventral belt members 31 are inserted into one region in the CD direction as shown in FIG. 4B with respect to the intermediate product 1m in FIG. 4A as the sheet-like member 1m. The pore groups Gh31, Gh31 are repeatedly formed in the conveying direction at a product pitch P1, and the pair of vent holes Gh41, Gh41 of the back band member 41 are repeatedly formed in the conveying direction at the product pitch P1 in the other area. To do. 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.

As shown in FIG. 5, the hole forming device 50 includes three rolls 51, 52, and 59 that are driven and rotated about rotation axes C <b> 51, C <b> 52, and C <b> 59 along the CD direction. That is, the rolls 51, 52, 59 are arranged in the order of the upstream roll 51, the intermediate roll 52 (corresponding to a rotating body), and the downstream roll 59 from the upstream side to the downstream side in the transport direction. . Further, the intermediate roll 52 is disposed close to each of the rolls 51 and 59 so that both the upstream roll 51 and the downstream roll 59 face the outer peripheral surfaces 51s, 52s, and 59s. Then, the intermediate product 1m sent to the hole forming device 50 is transported through a substantially Ω-shaped transport route based on the rotational operation of these three rolls 51, 52, 59. That is, first, the intermediate product 1m is transported along the arc-shaped first transport route R51 that is wound around the upstream roll 51, and then is arc-shaped second transport that is wound around the intermediate roll 52. It is transported by the route R52 and finally transported by the arc-shaped third transport route R59 that is wound around the downstream roll 59. After that, the intermediate product 1m is separated from the downstream roll 59 and sent to the lower process.
The upstream roll 51 and the intermediate roll 52 are closest to each other at a predetermined position P51 in the rotation direction Dc51 of the upstream roll 51, but this closest position P51 (hereinafter also referred to as the closest position) This is the position where the first transport route R51 switches to the second transport route R52. Similarly, the intermediate roll 52 and the downstream roll 59 are closest to each other at a predetermined position P52 in the rotational direction Dc52 of the intermediate roll 52. This closest position P52 is third transported from the second transport route R52. This is the position where the route is switched to the route R59.

In addition, a plurality of pin members 55p, 55p (corresponding to push-in members) are provided protruding from the outer peripheral surface 52s of the intermediate roll 52 as members different from the roll 52. Each pin member 55p, 55p ... is a member whose tip end side is tapered. That is, as shown in the schematic enlarged view of FIG. 6, in this example, the pin member 55p has a conical portion 55pa (corresponding to the front end portion) on the distal end side and has the same diameter as the bottom surface of the conical portion 55pa on the root side. A cylindrical portion 55pb (corresponding to the base end portion) is integrally provided. Further, the outer peripheral surface 51s of the upstream roll 51 has holes 51h, 51h, into which pin members 55p, 55p, etc. can be inserted. 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 intermediate product 1m located on the upstream roll 51 in FIG. 5 passes the closest position P51, as shown in FIG. When the corresponding pin member 55p is inserted into each hole portion 51h of 51, the pin member 55p is smoothly pushed into the formation target portion of the intermediate product 1m, and thereby the ventilation target hole is formed in the formation target portion. h is formed through quickly.

Note that the apex angle of the conical portion 55pa in FIG. 6 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 52 in FIG. 5 forms the ventilation hole groups Gh31, Gh31, Gh31, Gh31, Gh41, Gh41, Gh41, Gh41 for two diapers per rotation as shown in FIG. 4B. 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 in FIG. 5 has a circumference corresponding to the product pitch P1 so that the air hole group Gh31, Gh31, Gh41, Gh41 for one diaper in FIG. 4B can be formed per rotation. It is a small diameter roll. However, it is not limited to this.

FIG. 7 is an explanatory diagram of an arrangement pattern of the pin members 55p on the outer peripheral surface 52s of the intermediate roll 52. FIG. In FIG. 7, the outer peripheral surface 52 s of the intermediate roll 52 is shown as a flat surface, and a receiving portion 55 r described later is not shown for the purpose of preventing the complication of the drawing.

As shown in FIG. 7, the pin member 55p is provided so as to correspond to the vent hole groups Gh31 and Gh41 formed in the aforementioned intermediate product 1m. That is, as shown in FIG. 4B, a pair of vent holes Gh31 and Gh31 should be formed for the ventral belt member 31 for each diaper in a region on one side in the CD direction of the intermediate product 1m. As shown in FIG. 7, 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 52s of the intermediate roll 52. A pair is provided side by side in the rotational direction Dc52. Similarly, in the intermediate product 1m, 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 area on the other side in the CD direction on the surface 52s, a pair of pin member groups G55p2 and G55p2 having a plurality of pin members 55p in the same staggered arrangement as the vent hole group Gh41 are provided side by side in the rotation direction Dc52.

In this example, as described above, since the intermediate roll 52 forms the ventilation holes h for two diapers in one rotation, the pair of pin member groups G55p1, G55p1 (G55p2, G55p2) arranged in the rotation direction Dc52. ) Is one set of pin member group sets SG55p1 (SG55p2), the outer peripheral surface 52s of the intermediate roll 52 has two sets of pin member group sets SG55p1, SG55p1 (SG55p2) at an equal pitch of 180 ° in the rotational direction Dc52. , SG55p2) are provided side by side.

Incidentally, the pin member 55p is heated for the purpose of easily forming the vent hole h. That is, since the nonwoven fabrics 1mw1 and 1mw2 which are the two continuous sheets 1mw1 and 1mw2 of the intermediate product 1m are respectively formed of thermoplastic resin fibers, they are softened when heated and easily form the vent holes h. . Moreover, in this embodiment, in order to hold the pin member 55p on the intermediate roll 52 so that the heat radiation of the outer peripheral surface 52s of the intermediate roll 52 can be reduced and the heating efficiency of the pin member 55p can be improved during this heating. The holding structure is also devised. Hereinafter, the configuration of the intermediate roll 52 including this device will be described.

FIG. 8 is an explanatory view thereof, and is a schematic longitudinal sectional view of the intermediate roll 52. FIG. 9 is an enlarged view of the IX portion in FIG. In FIGS. 8 and 9, a receiving portion 55r, which will be described later, is not shown for the purpose of preventing complication of the drawings. In FIG. 9, the intermediate product 1m is virtually indicated by a two-dot chain line.

As shown in FIG. 8, the intermediate roll 52 includes a substantially columnar center side portion 52in including the above-described rotation axis C52 as a center, and an outer peripheral surface 52inex of the center side portion 52in over substantially the entire circumference in the rotation direction Dc52. A substantially cylindrical outer peripheral portion 52ex provided so as to cover the circular end plates 53, 53 (on the fixing member) provided at both ends in the CD direction in order to fix the outer peripheral portion 52ex to the central portion 52in. And a rod-shaped heating element 54 accommodated substantially coaxially with the rotation axis C52 inside the center side portion 52in. In this example, the center side portion 52in, the outer peripheral side portion 52ex, the pin member 55p, and the end plate 53 are all made of iron as an example of metal, but are not limited to iron. For example, other metal such as aluminum or cemented carbide may be used.

Here, between the inner peripheral surface 52exin of the outer peripheral side portion 52ex and the outer peripheral surface 52inex of the central side portion 52in, gaps G52 in the rotational radius direction Dr52 are formed substantially uniformly over the entire circumference in the rotational direction Dc52. That is, the gap G52 has a substantially cylindrical shape. The outer peripheral portion 52ex is fixed to the central portion 52in by the end plate 53 so that the positional relationship having the substantially cylindrical gap G52 is maintained.

Note that the dimension LG52 of the gap G52 in the rotational radius direction Dr52 is set in a range of 1 mm to 10 mm, for example, and is set to 2 mm in this example, but is not limited thereto.

Further, as shown in FIG. 9, the outer peripheral portion 52ex has a through hole 52exh1 (corresponding to the first through hole) along the rotational radial direction Dr52 corresponding to the arrangement target position of each pin member 55p. The first through hole 52exh1 is also formed, and the pin member 55p has a circular shape projecting outward from the outer peripheral surface of the cylindrical portion 55pb on the inner side in the rotational radial direction Dr52 than the aforementioned cylindrical portion 55pb. A flange portion 55pf is provided integrally and coaxially. And the diameter of the above-mentioned cone part 55pa (equivalent to a front-end | tip part) and cylindrical part 55pb (equivalent to a base end part) of the pin member 55p is set smaller than the diameter of said 1st through-hole 52exh1, The diameter of the flange portion 55pf is set larger than that of the first through hole 52exh1. Therefore, when the pin member 55p is inserted into the first through hole 52exh1 from the inside in the rotational radius direction Dr52, the conical portion 55pa and the columnar portion 55pb of the pin member 55p quickly pass through the first through hole 52exh1. The flange portion 55pf is hooked on the edge portion of the first through hole 52exh1 in the inner peripheral surface 52exin of the outer peripheral side portion 52ex and cannot be inserted. As a result, a part of the conical portion 55pa and the columnar portion 55pb is located substantially outside the rotational radius direction Dr52 with respect to the outer peripheral surface 52exex of the outer peripheral portion 52ex, while the flange portion 55pf has an outer peripheral portion. The positional relationship is such that it is located inside the inner peripheral surface 52exin of 52ex. And in order to fix in such a positional relationship, the above-mentioned center side part 52in is further inserted in the outer peripheral side part 52ex, but here, the above-mentioned between the outer peripheral side part 52ex and the center side part 52in The size LG52 of the gap G52 in the rotational radius direction Dr52 is substantially the same value as the dimension L55pf of the flange portion 55pf in the rotational radius direction Dr52. Therefore, the flange portion 55pf inserted in the gap G52 is held in contact with the inner peripheral surface 52exin of the outer peripheral side portion 52ex while being in contact with the outer peripheral surface 52inex of the central portion 52in.

In such a holding state, when power is supplied to the heating element 54 (FIG. 8) provided in the central portion 52in and the heating element 54 generates heat, the amount of generated heat is changed to the central portion 52in. Is transmitted radially outward in the rotational radial direction Dr52. And as shown in FIG. 9, the pin member 55p is heated via the said flange part 55pf contact | abutted with the outer peripheral surface 52inex of the center side part 52in.

As can be seen with reference to FIG. 9, the gap G52 described above exists between the outer peripheral portion 52ex and the central portion 52in at the non-arrangement position where at least the pin member 55p is not disposed in the outer peripheral portion 52ex. is doing. Therefore, the heat radiation at the non-arranged position is effectively suppressed by the high heat insulating property of the air in the gap G52. As a result, it is possible to suppress a decrease in the heating efficiency of the pin member 55p by the cartridge heater 54.

In some cases, when assembling the intermediate roll 52, the dimension LG52 in the rotational radius direction Dr52 of the gap G52 is larger than the dimension L55pf in the rotational radius direction Dr52 of the flange portion 55pf of the pin member 55p (FIG. 9). May be slightly larger. However, in that case, there is a concern that the pin member 55p can move in the rotational radius direction Dr52 by the larger amount, and the position of the pin member 55p becomes difficult to be determined.
However, after the operation of the hole forming device 50, the center side portion 52in and the flange portion 55pf increase in temperature and thermally expand, so that the above dimensional difference is eliminated. As a result, as described above, the flange portion 55pf is held in contact with the inner peripheral surface 52exin of the outer peripheral side portion 52ex while being in contact with the outer peripheral surface 52inex of the central side portion 52in. Therefore, even when there is a dimensional difference as described above during assembly, after the device 50 is operated, the amount of heat of the heating element 54 in the center side portion 52in abuts on the outer peripheral surface 52inex of the center side portion 52in. It is promptly transmitted to the pin member 55p via the flange portion 55pf, so that the pin member 55p can be heated without any problem.

However, as shown in FIG. 10, the flange portion 55pf of the pin member 55p may be brought into contact with the outer peripheral surface 52inex of the central portion 52in with certainty. That is, a compression coil spring 55cs is provided as an elastic member that generates elastic force between the flange portion 55pf and the inner peripheral surface 52exin of the outer peripheral side portion 52ex, and the radial direction of rotation from the coil spring 55cs to the pin member 55p is provided. You may give the elastic force which faced inward of Dr52. According to this configuration, the flange portion 55pf of the pin member 55p is pressed against the outer peripheral surface 52inex of the center side portion 52in based on the elastic force. Therefore, the flange portion 55pf is pressed against the outer peripheral surface 52inex of the center side portion 52in. It becomes possible to make it contact | abut reliably.

Desirably, a gap G55pb is provided between the inner peripheral surface 52exh1s of the first through hole 52exh1 and the outer peripheral surface 55pbs of the cylindrical portion 55pb of the pin member 55p as shown in FIG. And if it becomes like this, since the heat transfer from the pin member 55p to the outer peripheral side part 52ex is suppressed, it becomes possible to further suppress the fall of said heating efficiency.

As shown in FIG. 8, the heating element 54 is, for example, an electric heater that generates heat based on supplied power, and more specifically, a rod-shaped cartridge heater 54 having an axial direction. The heater 54 is inserted coaxially with the hole 52inh into the accommodation hole 52inh formed in the central portion 52in coaxially with the rotation axis C52 of the intermediate roll 52 described above. Therefore, the heat generated from the heater 54 is transmitted radially in the center side portion 52in outward in the rotational radial direction Dr52, and finally via the flange portion 55pf and the cylindrical portion 55pb of the pin member 55p in FIG. And reaches the conical portion 55pa.

Further, as shown in FIG. 8 with a part broken away, the cartridge heater 54 includes a pipe material 54p as a case and a coil shape with a substantially constant radius around the rotation axis C52 while being accommodated in the pipe material 54p. And a heating wire 54c wound around. When the heat generation line 54c is connected to a power source via a temperature control unit (not shown) formed by a suitable computer, the heat generation line 54c has a heat generation amount (W) corresponding to the power (W) supplied from the power source. 54c generates heat.

Here, it is desirable that the temperature of the pin member 55p heated by the heater 54 be within the following temperature range. That is, it is good if it is within the softening point of the thermoplastic resin fibers contained in the nonwoven fabrics 1mw1 and 1mw2 of the intermediate product 1m and below the same melting point. And if it has become like this, first, based on being less than melting | fusing point, while being able to suppress the thermal damage of the nonwoven fabric 1mw1,1mw2 of the intermediate product 1m, based on being above a softening point, the nonwoven fabric 1mw1 , 1 mw 2 can be surely reduced in penetration resistance when the vent hole h is formed.

If the nonwoven fabrics 1mw1 and 1mw2 are composed of a plurality of types of thermoplastic resins and the softening points of these different types of thermoplastic resins are different from each other, the lowest softening point is selected as the softening point. However, it is preferable to select the highest softening point. Similarly, when the melting points of different types of thermoplastic resins are different from each other, the highest melting point may be selected as the melting point, but the lowest melting point is preferably selected. And if it does in this way, said effect can be show | played reliably.
Incidentally, the softening point can be obtained by TMA (thermomechanical analysis) of JISK5496 (softening temperature test method by thermomechanical analysis of thermoplastic film and sheet). The melting point can be determined by DSC (differential scanning calorimetry) of JISK5421 (plastic transition temperature measurement method). That is, the melting peak temperature defined in the DSC description of JISK5421 can be set as the melting point.

Also, the adjustment to the temperature range as described above can be realized as follows. That is, a temperature sensor (not shown) such as a thermocouple is provided in the vicinity of the pin member 55p in the center side portion 52in and the outer peripheral side portion 52ex or the pin member 55p itself, and based on the temperature signal output from the temperature sensor, The supply power (W) to the cartridge heater 54 may be feedback controlled.

Incidentally, FIG. 11 shows an enlarged view of the XI portion in FIG. 7, and FIG. 12 shows a view taken along arrow XII-XII in FIG. 11. Here, as shown in FIG. A pin member is located at a position between adjacent pin members 55p, 55p on the outer peripheral surface 52s (52exex) of the intermediate roll 52 (corresponding to "a position different from the arrangement position of the pushing member on the outer peripheral surface of the outer peripheral portion"). A receiving portion 55r separate from 55p is formed to protrude.
Then, as shown in FIG. 12, the receiving portion 55r has a cylindrical portion 55rb (corresponding to the base end portion) as a main body, and faces the distal end of the cylindrical portion 55rb outward in the rotational radius direction Dr52 of the intermediate roll 52. It has a substantially flat top surface 55rt. Further, the top surface 55rt is located outside the outer peripheral surface 52exex of the outer peripheral side portion 52ex in a position outside the rotational radial direction Dr52 and inside the rotational radius direction Dr52 from the tip of the pin member 55p.
Therefore, the receiving portion 55r can receive the intermediate product 1m without penetrating the intermediate product 1m at a position outside the outer peripheral surface 52exex of the outer peripheral side portion 52ex in the rotational radial direction Dr52, that is, the intermediate product 1m and the outer peripheral side portion. A gap G1m (FIG. 12) can be provided between 52ex and 52ex. As a result, heat input from the outer peripheral side portion 52ex to the intermediate product 1m can be suppressed, and as a result, thermal damage of the intermediate product 1m due to heat input from the outer peripheral side portion 52ex can be suppressed.

Such a receiving portion 55r is also held by the central side portion 52in of the intermediate roll 52 by the same holding structure as that of the pin member 55p described above. That is, as shown in FIG. 12, first, the outer peripheral surface 52exex of the outer peripheral portion 52ex is formed in the through hole 52exh2 (second through hole) along the rotation radial direction Dr52 in correspondence with the arrangement target position of each receiving portion 55r. It corresponds to a hole and is also referred to as a second through hole 52exh2 below). In addition, the receiving portion 55r has a circular flange portion 55rf that protrudes outward from the outer peripheral surface of the cylindrical portion 55rb on the inner side in the rotational radial direction Dr52 than the cylindrical portion 55rb. The diameter of the cylindrical portion 55rb is set smaller than the diameter of the second through hole 52exh2, but the diameter of the flange portion 55rf is set larger than the second through hole 52exh2. Therefore, when the receiving portion 55r is inserted into the second through hole 52exh2 from the inside in the rotational radius direction Dr52, the cylindrical portion 55rb quickly passes through the second through hole 52exh2, but the flange portion 55rf The portion 52ex is hooked on the edge of the second through hole 52exh2 in the inner peripheral surface 52exin and cannot be inserted. As a result, the top surface 55rt of the cylindrical portion 55rb is positioned outside the outer peripheral surface 52exex of the outer peripheral portion 52ex in the rotational radial direction Dr52, while the flange portion 55rf is the inner periphery of the outer peripheral portion 52ex. Although the positional relationship is such that it is located on the inner side of the surface 52exin, the above-described center side portion 52in is inserted into the outer peripheral side portion 52ex in order to fix in this positional relationship. As a result, the flange portion 55rf is inserted into the gap G52 between the outer peripheral portion 52ex and the inner peripheral portion 52in, and the receiving portion 55r is located on the center side based on the inserted state. It is held in the portion 52in.

In this example, as shown in FIG. 11, the receiving portions 55r are provided at four locations around the pin member 55p, respectively, thereby making it possible to reliably receive the intermediate product 1m. 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.

Further, in this example, the top surface 55rt of the receiving portion 55r has a perfect circular shape. The diameter 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.

Desirably, the thermal conductivity (W / (m · K)) of the receiving portion 55r is smaller than the thermal conductivities (W / (m · K)) of the pin member 55p and the outer peripheral portion 52ex. good. For example, in this example, since both the pin member 55p and the outer peripheral portion 52ex are made of iron, the receiving portion 55r is made of a resin such as Teflon (trade name: polytetrafluoroethylene) or a metal or ceramic having a thermal conductivity smaller than that of iron. It is good to make it. In this way, it is possible to secure a large heat input from the pin member 55p to the intermediate product 1m while reducing the heat input from the receiving portion 55r to the intermediate product 1m. While suppressing the thermal damage of the intermediate product 1m at 55r, the formability of the vent hole h by the pin member 55p can be enhanced.

Further, desirably, the first through hole 52exh1 for holding the pin member 55p shown in FIG. 12 is formed to have a size that allows the cylindrical portion 55rb of the receiving portion 55r to be inserted and prevents the flange portion 55rf from being inserted. The second through hole 52exh2 for holding the receiving portion 55r may be formed to have a size that allows the conical portion 55pa and the cylindrical portion 55pb of the pin member 55p to be inserted but not the flange portion 55pf.
In this case, the receiving portion 55r can be held in the first through hole 52exh1 for holding the pin member 55p, and conversely the pin member 55p in the second through hole 52exh2 for holding the receiving portion 55r. Can be held. Therefore, the arrangement pattern of the pin member 55p and the receiving portion 55r can be freely changed by appropriately changing the arrangement positions of the pin member 55p and the receiving portion 55r. And thereby, the freedom degree of the setting of the arrangement pattern of the vent hole h which the pin member 55p forms can be raised. That is, a plurality of types of diapers 1 having different arrangement patterns of the vent holes h can be easily created.

Further, in some cases, the receiving portion 55r may be integrated with the cylindrical portion 55pb of the pin member 55p. FIG. 13 is an explanatory diagram of an example thereof. In this example, a large-diameter portion 55pr that protrudes outward from the outer peripheral surface of the cylindrical portion 55pb is integrally provided at a position inside the rotational radius direction Dr52 in the cylindrical portion 55pb. And in this large diameter part 55pr, the annular | circular shaped top surface 55prs which faced the outer side of the rotation radial direction Dr52 functions as a receiving part 55prs. Therefore, if such a pin member 55p ′ in which the receiving part 55prs is integrated is used, the receiving part 55prs can firmly receive the intermediate product 1m even in the vicinity of the pin member 55p ′. The gap G1m can be reliably provided between the intermediate product 1m and the outer peripheral surface 52exex of the outer peripheral portion 52ex even in the vicinity where the intermediate product 1m is assumed to be closest to the outer peripheral portion 52ex.

Further, in the example of FIG. 13, a portion including the conical portion 55pa and the cylindrical portion 55pb of the pin member 55p ′ is referred to as a “tip side portion 55pe1”, and a portion including the flange portion 55pf and the large diameter portion 55pr. In the case of “root side portion 55pe2”, the former tip side portion 55pe1 is preferably configured to be detachable from the latter root side portion 55pe2 by a screw structure or the like. Details are as follows.
First, in the example of FIG. 13, a male screw SCM is formed on the outer peripheral surface of the inner end portion in the rotational radial direction Dr52 of the cylindrical portion 55pb provided in the tip side portion 55pe1, while the root side portion 55pe2 is formed on the outer peripheral surface. An internal thread SCF is formed on the outer end surface 55prs of the large-diameter portion 55pr on the outer side in the rotational radial direction Dr52. The former male screw SCM is screwed into the latter female screw SCF, so that both of them are detachably fixed.
Therefore, it is possible to remove only the tip side portion 55pe1 while leaving the base side portion 55pe2 in the outer peripheral side portion 52ex and the center side portion 52in of the intermediate roll 52. Therefore, even when the tip side portion 55pe1 is worn away and the formability of the vent hole h is lowered, only the tip side portion 55pe1 of the problematic pin member 55p is selectively replaced with a new tip side portion 55pe1. Thus, the roll 52 can be returned to a state in which the formability of the vent hole h is good without disassembling the entire intermediate roll 52. As a result, the work load for maintenance of the pin member 55p can be reduced.

Further, in this example, as described above with reference to FIG. 7, the outer peripheral surface 52 s of the intermediate roll 52, that is, the outer peripheral surface 52 exex of the outer peripheral portion 52 ex, the region on the one side in the CD direction The two pin member group sets SG55p1 and SG55p1 are arranged side by side in the rotational direction Dc52. Similarly, in the other region, the pin member group sets SG55p2 and SG55p2 for the back band member 41 are disposed in the rotational direction Dc52. Two sets are arranged side by side. The pin member group set SG55p1 for the ventral belt member 31 has a pair of pin member groups G55p1 and G55p1 arranged in the rotation direction Dc52, and an area between the two pin member groups G55p1 and G55p1. A portion of the intermediate product 1 in which the absorbent main body 10 is provided abuts against the AN. Here, as can be seen with reference to FIGS. 2 and 4B, no vent hole h is formed in the portion. Therefore, as shown in FIG. 7, the area AN is a non-arranged area AN in which the pin member 55p is not arranged at all. Further, the non-arrangement area AN has a relatively large area. That is, it has a series of areas much larger than that of the top surface 55rt of the receiving portion 55r described above.

Therefore, as shown in FIG. 7, in this non-arranged area AN, the intermediate product 1m can be received in a wider range with a large top surface 55 ms instead of the receiving portion 55r (FIG. 11) having a small top surface 55tr. For this purpose, a planar member 55m having an arc surface is disposed as the top surface 55ms. That is, as shown in FIG. 5, the top surface 55ms of the planar member 55m is an arc surface along the rotational direction Dc52 while facing the outer side of the rotational radius direction Dr52. The outer surface 52exex of the portion 52ex is positioned outside the rotational radius direction Dr52, and as shown in FIG. 7, the area is at least 10 times, preferably 100 times, the top surface 55rt of the receiving portion 55r. have.
Therefore, when the top surface 55 ms abuts against the intermediate product 1 m, the intermediate product 1 m can be reliably separated from the outer peripheral portion 52ex over a wide range.
In this example, the thermal conductivity (W / (m · K)) of the planar member 55m is higher than the thermal conductivity (W / (m · K)) of the pin member 55p and the outer peripheral side portion 52ex. It is getting smaller. That is, in this example, the pin member 55p and the outer peripheral portion 52ex are both made of iron as described above, while the planar member 55m is made of bakelite as an example of resin. The thermal conductivity of the planar member 55m is smaller than the thermal conductivity of the side portion 52ex.
Therefore, large heat input from the pin member 55p to the intermediate product 1m can be secured while reducing heat input from the planar member 55m to the intermediate product 1m. Thus, it is possible to improve the formability of the hole h in the pin member 55p while suppressing thermal damage of the intermediate product 1m due to contact with the planar member 55m.

Incidentally, the contents of the above-mentioned planar member 55m are the same for the pin member group sets SG55p2 and SG55p2 for the back band member 41 in FIG. Therefore, the description is omitted.

FIG. 14 is an explanatory diagram of an arrangement pattern of the holes 51 h in the outer peripheral surface 51 s of the upstream roll 51. In FIG. 14, the outer peripheral surface 51 s of the roll 51 is shown as a flat surface.
As shown in FIG. 14, the hole 51h in the outer peripheral surface 51s of the upstream roll 51 is provided in correspondence with the pin member 55p. That is, as shown in FIG. 7, a pair of pin member groups G55p1 and G55p1 are provided side by side in the rotation direction Dc52 in the region on one side in the CD direction on the outer peripheral surface 52s of the intermediate roll 52. Correspondingly, a pair of hole groups G51h1 and G51h1 having a plurality of hole parts 51h in a staggered arrangement are provided in a region on one side in the CD direction on the outer peripheral surface 51s of the upstream roll 51 in parallel with the rotation direction Dc51. It has been. Similarly, as shown in FIG. 7, a pair of pin member groups G55p2 and G55p2 are arranged in the rotational direction Dc52 in the other region in the CD direction on the outer peripheral surface 52s of the intermediate roll 52. Corresponding to the above, 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 rotational direction Dc51 in the area on the other side in the CD direction on the outer peripheral surface of the upstream roll 51. It has been.

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.

On the other hand, the configuration of the downstream roll 59 in FIG. 5 is substantially the same as that of the upstream roll 51. For example, hole groups G59h1 and G59h2 having the same specifications as the hole groups G51h1 and G51h2 of the outer peripheral surface 51s of the upstream roll 51 are provided on the outer peripheral surface 59s of the downstream roll 59. As a result, when the intermediate product 1m is received from the intermediate roll 52, the pin member 55p of the intermediate roll 52 is smoothly inserted into the hole portions 59h of the hole group G59h1 and G59h2. The intermediate product 1m can be received without greatly changing the shape of the vent hole h formed in the product 1m.

=== 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 vent hole h is illustrated as an example of the hole portion, and the vent hole h is a through hole, but is not limited thereto. For example, the hole may be a bottomed hole having a bottom. The formation of the bottomed hole can be realized by passing the above-mentioned intermediate product 1m between an embossing roll (not shown) and an anvil roll which are driven and rotated with their outer peripheral surfaces facing each other. The embossing roll is, for example, a roll having a plurality of convex portions with a substantially flat top surface on the outer peripheral surface, and the anvil roll is a roll having a substantially smooth outer peripheral surface.

In the above-described embodiment, as illustrated in FIG. 6, the pin member 55p of the intermediate roll 52 is exemplified as the pushing member provided on the rotating body, and the pin member 55p is a member having a tapered shape at the tip end side. However, it is not limited to this. For example, a member whose tip side is not tapered may be used. Further, as shown in FIG. 6, the pin member 55p has the conical portion 55pa and the cylindrical portion 55pb. However, the present invention is not limited to this. 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 intermediate product 1m is wound around the upstream roll 51 and the intermediate roll 52, respectively, as shown in FIG. That is, the intermediate product 1m may be passed between the rolls 51 and 52 without being wound around either the upstream roll 51 or the intermediate roll 52.

In the above-described embodiment, the vent hole h of the ventral belt member 31 and the back belt member 41 is illustrated as an example of the hole portion, but is not limited thereto. For example, the hole forming device 50 and the hole forming method of the present invention may be applied when forming holes for uses other than the improvement in air permeability in the ventral band member 31 and the back band member 41.

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, the hole forming device 50 and the hole forming method of the present invention may be applied when forming the vent hole h in a nonwoven fabric that is a material of a two-piece type disposable diaper. 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 nonwoven fabric, and forms the vent hole h in the said nonwoven fabric, the hole formation apparatus 50 and the hole formation method of this invention are used. It will be.
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 by using a nonwoven fabric as a material, the hole forming device 50 and the hole forming method of the present invention can be applied during the manufacture. Therefore, the concept of the absorbent article includes a urine absorbing pad and a sanitary napkin.

1 disposable diapers (absorbent articles),
1m intermediate product (sheet-like member),
1mw1 continuous sheet, 1mw2 continuous sheet,
1mw2p1 part, 1mw2p2 part,
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 elastic member,
31 ventral band member, 31a continuum, 31e end,
31s Absorbent body non-existing part, 32 non-woven fabric, 32Le end,
33 non-woven fabric, 33B folded portion, 35 elastic member, 35a continuum,
41 back side belt member, 41a continuous body, 42 nonwoven fabric, 41Le end, 43 nonwoven fabric,
50 hole forming device,
51 upstream roll, 51h hole, 51s outer peripheral surface,
52 intermediate roll (rotary body), 52s outer peripheral surface,
52ex outer peripheral side, 52exex outer peripheral surface, 52exin inner peripheral surface,
52exh1 first through hole, 52exh1s inner peripheral surface,
52exh2 second through hole,
52in center side part, 52inex outer peripheral surface,
52 inh receiving hole,
53 End plate (fixing member),
54 cartridge heater (heating element), 54c heating wire, 54p pipe material,
55p pin member (pushing member), 55p ′ pin member (pushing member),
55pa conical portion (tip portion), 55pb cylindrical portion (base end portion), 55pbs outer peripheral surface,
55pf flange,
55pe1 tip side part, 55pe2 root side part,
55pr large diameter part, 55prs top face (end face, receiving part),
55r receiving portion, 55rt top surface,
55rb cylinder (base end), 55rf flange,
55m planar member, 55ms top surface,
59 downstream roll, 59h hole, 59s outer peripheral surface,
BH waist opening, LH leg opening, LG leg gather,
CL1 center position, CL10 predetermined position,
h Ventilation hole (hole),
G52 gap, G1m gap, G55pb gap,
C51 rotation axis, C52 rotation axis,
AN non-location area,
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,
G59h1 hole group, G59h2 hole group,
P51 closest approach position, P52 closest approach position,
SG51h1 hole group set, SG51h2 hole group set,
SG55p1 pin member group set, SG55p2 pin member group set,
R51 first transport route, R52 second transport route, R59 third transport route,
P51 closest position, P52 predetermined position,

Claims (13)

1. A plurality of pushing members provided as separate members from the rotating body while being projected outside the outer peripheral surface of the rotating body rotating around the rotation axis along the CD direction are conveyed along the rotating direction of the rotating body. An apparatus for forming a plurality of holes in the sheet-like member by pushing into the sheet-like member,
   The rotating body is provided on a center side portion including the rotating shaft, and on the outer side in the rotational radius direction of the rotating body with respect to the center side portion, and the pressing member so that the pressing member abuts on the center side portion. An outer peripheral side portion for holding the heating member, and a heating element that is provided in the central side portion and heats the pushing member through the central side portion,
   A hole forming device for a sheet-like member according to an absorbent article, wherein a gap in the rotational radius direction is provided between the center side portion and the outer peripheral side portion.
2. A hole forming device for a sheet-like member according to claim 1,
   An absorbent article, wherein the pushing member is pushed into the sheet-like member while holding the sheet-like member on the rotating body so that a gap exists between the sheet-like member and the outer peripheral side portion. The hole formation apparatus of the sheet-like member which concerns on this.
3. A hole forming device for a sheet-like member according to claim 2,
   A receiving portion that can be received without penetrating the sheet-like member at a position on the outer side in the rotational radial direction with respect to the outer peripheral surface of the outer peripheral side portion and at a position on the inner side in the rotational radial direction with respect to the tip of the pushing member. A hole forming device for a sheet-like member according to an absorbent article, which is held by the rotating body.
4. A hole forming device for a sheet-like member according to claim 3,
   The receiving portion is separate from the pushing member, and is disposed at a position different from the placement position of the pushing member on the outer peripheral surface of the outer peripheral side portion,
   The thermal conductivity (W / (m · K)) of the receiving portion is the thermal conductivity (W / (m · K)) of the pushing member and the thermal conductivity (W / (m · K) of the outer peripheral portion. )), A hole forming device for a sheet-like member according to an absorbent article.
5. A hole forming device for a sheet-like member according to any one of claims 1 to 4,
   The pushing member is provided at a distal end portion to be pushed into the sheet-like member, a proximal end portion located on the inner side in the rotational radius direction from the distal end portion, and an inner side in the rotational radius direction from the proximal end portion. And a flange portion protruding outward from the outer peripheral surface of the base end portion,
   The outer peripheral portion has a first through hole through which the distal end portion and the base end portion can be inserted, and the flange portion that cannot be inserted into the first through hole is formed between the central side portion and the outer peripheral side portion. An apparatus for forming a hole in a sheet-like member according to an absorbent article, wherein the pushing member is held in the center side portion by being inserted into the gap therebetween.
6. A hole forming device for a sheet-like member according to claim 5,
   A receiving portion that can be received without penetrating the sheet-like member at a position on the outer side in the rotational radial direction with respect to the outer peripheral surface of the outer peripheral side portion and at a position on the inner side in the rotational radial direction with respect to the tip of the pushing member. Held by the rotating body,
   The receiving portion is separate from the pushing member, and is disposed at a position different from the placement position of the pushing member on the outer peripheral surface of the outer peripheral side portion,
   The receiving portion includes a base end portion that comes into contact with the sheet-like member, a flange portion that is provided on the inner side in the rotational radius direction than the base end portion, and projects outward from the outer peripheral surface of the base end portion. Have
   The outer peripheral portion has a second through hole through which the base end portion of the receiving portion can be inserted, and the flange portion that cannot be inserted into the second through hole is formed between the center side portion and the outer peripheral side portion. The hole forming device for a sheet-like member according to the absorbent article, wherein the receiving portion is held at the center side portion by being inserted into the gap.
7. A hole forming device for a sheet-like member according to the absorbent article according to claim 6,
   The first through hole is formed in a size such that the base end portion of the receiving portion can be inserted and the flange portion of the receiving portion cannot be inserted,
   In the absorbent article, the second through hole is formed in a size that allows the distal end portion and the proximal end portion of the push-in member to be inserted, and the flange portion of the push-in member to be not inserted. The hole formation apparatus of the sheet-like member which concerns.
8. A hole forming device for a sheet-like member according to any one of claims 5 to 7,
   When the portion including the distal end portion in the pushing member is a distal end side portion and the portion including the flange portion is a root side portion, the portion held by the center side portion via the flange portion is used. A hole forming device for a sheet-like member according to an absorbent article, wherein the tip side portion is configured to be detachable from a root side portion.
9. A hole forming device for a sheet-like member according to any one of claims 5 to 8,
   A hole forming device for a sheet-like member according to an absorbent article, wherein a gap is provided between an inner peripheral surface of the first through hole and an outer peripheral surface of the base end portion of the pushing member. .
10. A hole forming device for a sheet-like member according to any one of claims 1 to 9,
    On the outer peripheral surface of the outer peripheral side portion, an arrangement area where the plurality of pushing members are arranged in a predetermined pattern and a non-arrangement area where the pushing members are not arranged are set side by side in the rotation direction,
    The non-arrangement region is provided with a planar member having a top surface facing outward in the rotational radius direction, and the top surface is more in the rotational radius direction than the outer peripheral surface of the outer peripheral portion. Located outside the
    The thermal conductivity (W / (m · K)) of the planar member is the thermal conductivity (W / (m · K)) of the pushing member and the thermal conductivity (W / (m · K) of the outer peripheral side portion. K)), a hole forming device for a sheet-like member according to an absorbent article.
11. A hole forming device for a sheet-like member according to any one of claims 1 to 10,
    The pushing member has a distal end portion that is pushed into the sheet-like member, and a proximal end portion that is located on the inner side in the rotational radius direction than the distal end portion,
    A receiving portion that can be received without penetrating the sheet-like member at a position on the outer side in the rotational radial direction with respect to the outer peripheral surface of the outer peripheral side portion and at a position on the inner side in the rotational radial direction with respect to the tip of the pushing member. An apparatus for forming a hole in a sheet-like member according to an absorbent article, wherein the hole forming device is provided integrally with the base end.
12. A hole forming device for a sheet-like member according to any one of claims 1 to 11,
    The outer peripheral side portion is a cylindrical member that covers the outer peripheral surface of the central side portion over the entire circumference in the circumferential direction,
    The outer peripheral side portion is fixed coaxially to the central side portion via fixing members provided at both ends in the CD direction, and the hole forming device for a sheet-like member according to the absorbent article .
13. A method of forming a plurality of holes in a sheet-like member according to an absorbent article,
    Rotating the rotating body around a rotation axis along the CD direction;
    The sheet is formed by pushing a plurality of pushing members provided so as to protrude outside the outer peripheral surface of the rotating body as members separate from the rotating body into a sheet-like member conveyed along the rotation direction of the rotating body. Forming a plurality of holes in the shaped member,
    The rotating body is provided on a center side portion including the rotating shaft, and on the outer side in the rotational radius direction of the rotating body with respect to the center side portion, and the pressing member so that the pressing member abuts on the center side portion. An outer peripheral side portion for holding the heating member, and a heating element that is provided in the central side portion and heats the pushing member through the central side portion,
    A hole forming method for a sheet-like member according to an absorbent article, wherein a gap in the rotational radius direction is provided between the center side portion and the outer peripheral side portion.

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