JPWO2018042556A1 - Method and apparatus for manufacturing sheet-like member according to absorbent article - Google Patents

Abstract

Between the first non-woven fabric 30mf1 continuous in the transport direction and the second non-woven fabric 30mf2 continuous in the transport direction while being overlapped with the first non-woven fabric 30mf1 in the thickness direction, along the transport direction A plurality of elastic members 35a, 35a... Are arranged in the CD direction intersecting the conveyance direction, and a step of conveying the composite sheet 30mf fixed by being interposed, elastic members 35a adjacent in the CD direction in the composite sheet 30mf , 35a by pushing the pushing member 55p in the thickness direction to form a through hole h in the composite sheet 30mf, and a through hole forming processing position P51 in which the through hole h is formed in the same step S50. Step S60 of applying tension in the CD direction to the composite sheet 30 mf at a position downstream of the sheet and tension applied with the tension in the step S60 At a position downstream in the transport direction from the position P60, with a step S70 to perform processing for the composite sheet 30 mF, the.

Description

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

  Conventionally, in the production line of absorbent articles such as disposable diapers that absorb excrement such as urine, a plurality of through holes are formed in a continuous sheet continuous in the transport direction for the purpose of imparting air permeability to the absorbent articles, etc. Processing may be performed. Then, as an example of the forming method, Patent Document 1 discloses that a plurality of pushing members protrudingly formed on the outer peripheral surface of a rotating roll are pushed in the thickness direction with respect to the continuous sheet.

JP 2003-171866

  On the other hand, in the production line, it is also conceivable to form a plurality of through holes in the following composite sheet. That is, the composite sheet first has a first nonwoven fabric continuous in the transport direction, and a second nonwoven fabric continuous in the transport direction while being overlapped with the first nonwoven fabric in the thickness direction of the composite sheet. Then, between the first non-woven fabric and the second non-woven fabric, a plurality of elastic members extending in the transport direction and extending in the transport direction are interposed between the first non-woven fabric and the second non-woven fabric in the CD direction intersecting the transport direction And at least a first non-woven fabric or a second non-woven fabric.

  However, when the pushing member is pushed into the composite sheet to form the through holes, the fibers pushed back by the pushing member in the first and second nonwoven fabrics are excessively distributed at the edge of the through hole, or However, this may cause the composite sheet to be in an improper state where the influence of the through hole formation process is excessively left. When the composite sheet is further processed in such an improper state, the processing may become unstable or the processing accuracy may be deteriorated.

  In addition, excessive uneven distribution of fibers at the edge of the through hole as described above may also cause deterioration of the touch at the edge of the through hole, but as it is, multiple downstream processing steps in the transport direction Through the production of diapers, there is a risk that the final result will be a diaper with a poor touch.

  In this respect, as a method to improve the defects of the edge of the through hole as described above, it is effective to loosen the fibers of the edge of the through hole of the composite sheet at a position upstream of the processing step in the transport direction. It is considered to be a certain thing.

  The present invention has been made in view of the conventional problems as described above, and its object is to prevent the fibers of the edge of the through hole formed in the composite sheet from reaching a predetermined processing step. The purpose is to quickly loosen the fiber at the edge.

The main invention to achieve the above object is
A method for manufacturing a sheet-like member in which a plurality of through holes are formed from a composite sheet continuous in a predetermined direction,
The first non-woven fabric continuous in the predetermined direction and the second non-woven fabric continuous in the predetermined direction while being overlapped with the first non-woven fabric in the thickness direction of the composite sheet A conveying step of conveying the composite sheet in which the plurality of elastic members along the predetermined direction are interposed and fixed in a state of being arranged in the CD direction intersecting the predetermined direction, with the predetermined direction as the conveyance direction;
A through hole is formed in the composite sheet to form the through hole penetrating in the thickness direction by pushing a pushing member in the thickness direction to a position between the elastic members adjacent in the CD direction in the composite sheet. Forming process,
A CD direction tension applying step of applying tension in the CD direction to the composite sheet at a position downstream of the through hole formation processing position where the through hole is formed in the through hole forming step;
And a processing step of processing the composite sheet at a position downstream of the tension application position where the tension is applied in the CD direction tension application step, in the transport direction. It is a manufacturing method of a sheet-like member.

Also,
An apparatus for manufacturing a sheet-like member having a plurality of through holes formed from a composite sheet continuous in a predetermined direction, comprising:
The first non-woven fabric continuous in the predetermined direction and the second non-woven fabric continuous in the predetermined direction while being overlapped with the first non-woven fabric in the thickness direction of the composite sheet A conveying device for conveying the composite sheet, in which the plurality of elastic members along the predetermined direction are interposed and fixed in a state in which the plurality of elastic members are arranged in the CD direction intersecting the predetermined direction, the conveyance direction being the predetermined direction;
A through hole is formed in the composite sheet to form the through hole penetrating in the thickness direction by pushing a pushing member in the thickness direction to a position between the elastic members adjacent in the CD direction in the composite sheet. Forming device,
CD direction tension applying device that applies tension in the CD direction to the composite sheet at a position downstream of the through hole forming processing position at which the through hole forming device forms the through hole in the composite sheet in the transport direction When,
And a processing device for processing the composite sheet at a position downstream of the tension application position where the CD direction tension applying device applies the tension in the CD direction to the composite sheet. It is a manufacturing apparatus of the sheet-like member which concerns on the absorbent article characterized by the above.
Other features of the present invention will be apparent from the description of the present specification and the accompanying drawings.

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

FIG. 2 is a schematic perspective view of a three-piece type disposable diaper 1 as an example of an absorbent article as seen from the ventral side in a pant type state It is the schematic plan view which looked at the same diaper 1 of an unfolded state from the skin side. It is the III-III sectional view in FIG. It is the schematic plan view which looked at the ventral | abdominal band member 31 from the non-skin side of thickness direction. FIG. 5A is a schematic enlarged view of the vent hole h according to the first embodiment as viewed from the non-skin side in the thickness direction, and FIG. 5B is a cross-sectional view taken along the line B-B in FIG. 5A. It is a schematic plan view of the same line for explaining various processings performed by a production line. It is a schematic plan view of 1 m of intermediate products just before being conveyed by vent hole formation process S50. It is a schematic plan view of 1 m of intermediate products immediately after passing vent hole formation process S50. FIG. 8A is a schematic plan view of the continuum 31a of the ventral band member immediately before being transported to the ventral side thread rubber cutting step S80, and FIG. 8B is a continuation of the ventral band member during and after passing step S80. It is a schematic plan view of body 31a. It is a schematic side view of the vent formation device 50 which shows a part of structure in a longitudinal cross-sectional view. It is a schematic enlarged view of XX arrow in FIG. FIG. 18 is an explanatory view of an arrangement pattern of pin members 55 p on the outer peripheral surface of the intermediate roll 55. FIG. 16 is an explanatory view of an arrangement pattern of holes 51 h on the outer peripheral surface of the upstream roll 51. 13A is an enlarged view of a portion XIIIa in FIG. 11, and FIG. 13B is a B-B arrow view in FIG. 13A. FIG. 14A is a schematic plan view showing the CD direction tension applying device 60 in an enlarged manner, and FIG. 14B is a BB arrow view in FIG. 14A. FIG. 15A is a schematic side view of the ventral-side cutter device 80, and FIG. 15B is a B-B arrow view in FIG. 15A. It is a schematic explanatory drawing of the manufacturing method of 2nd Embodiment. It is a schematic explanatory drawing of the manufacturing method of 3rd Embodiment.

At least the following matters will be made clear by the present specification and the description of the accompanying drawings.
A method for manufacturing a sheet-like member in which a plurality of through holes are formed from a composite sheet continuous in a predetermined direction,
The first non-woven fabric continuous in the predetermined direction and the second non-woven fabric continuous in the predetermined direction while being overlapped with the first non-woven fabric in the thickness direction of the composite sheet A conveying step of conveying the composite sheet in which the plurality of elastic members along the predetermined direction are interposed and fixed in a state of being arranged in the CD direction intersecting the predetermined direction, with the predetermined direction as the conveyance direction;
A through hole is formed in the composite sheet to form the through hole penetrating in the thickness direction by pushing a pushing member in the thickness direction to a position between the elastic members adjacent in the CD direction in the composite sheet. Forming process,
A CD direction tension applying step of applying tension in the CD direction to the composite sheet at a position downstream of the through hole formation processing position where the through hole is formed in the through hole forming step;
And a processing step of processing the composite sheet at a position downstream of the tension application position where the tension is applied in the CD direction tension application step, in the transport direction. It is a manufacturing method of a sheet-like member.

  According to the method of manufacturing a sheet-like member according to such an absorbent article, the tension application position is located between the through hole forming processing position and the processing position in the processing step in the transport direction. ing. Therefore, before the fibers of the edge of the through hole formed in the composite sheet in the through hole forming step reach the above processing step, the fiber of the edge is subjected to the tension in the CD direction applied at the tension applying position. You can quickly loosen it based on

It is a manufacturing method of a sheet-like member concerning this absorptive article,
A plurality of the processing steps are provided downstream of the through hole formation processing position in the transport direction,
The tension applying position in the CD direction tension applying step is located between the through hole forming processing position and the position of the processing step closest to the through hole forming processing position among the plurality of processing steps. Is desirable.

  According to the manufacturing method of the sheet-like member concerning such an absorptive article, tension in the CD direction is given to the composite sheet at a position immediately downstream of the through hole formation processing position. Therefore, the composite sheet is made into a proper state in which the fibers of the edge portion of the through hole are loosened from the most upstream processing step among the plurality of processing steps located downstream of the through hole forming processing position. be able to. And thereby, processing to a composite sheet can be performed with high processing accuracy from the processing process of the top stream concerned.

It is a manufacturing method of a sheet-like member concerning this absorptive article,
It is preferable that there is no separate member fixing step for fixing another member to the composite sheet at a position upstream of the tension application position in the CD direction tension application step in the transport direction.

  According to the manufacturing method of the sheet-like member concerning such an absorptive article, tension in the direction of CD is given to the composite sheet before fixing the separate member. Therefore, a defect that occurs when applying a tension in the CD direction after fixing the separate member, that is, when the separate member receives the above-mentioned tension, the tension becomes difficult to be transmitted to the composite sheet, and It can be effectively prevented that the effect of loosening the fibers of the edge is reduced.

It is a manufacturing method of a sheet-like member concerning this absorptive article,
The first non-woven fabric and the second non-woven fabric both include thermoplastic resin fibers,
In the through hole forming step, the pushing member protrudingly formed on the outer peripheral surface of the first rotating body, which rotates along the conveying direction, rotates the outer peripheral surface of the second rotating body, which rotates along the conveying direction. When inserted into the hole, the push-in member is pushed into the composite sheet to form the through hole,
The rotating body of at least one of the first rotating body and the second rotating body is heated, and the composite sheet is heated by the rotating body,
In the CD direction tension application step, it is preferable to apply the tension in the CD direction to the composite sheet at a temperature higher than the temperature of the composite sheet before being heated by the rotating body.

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

It is a manufacturing method of a sheet-like member concerning this absorptive article,
It is desirable that the dimension in the CD direction of the composite sheet at the tension applying position is equal to or larger than the dimension in the CD direction of the composite sheet at the through hole formation processing position.

  According to the method for manufacturing a sheet-like member relating to such an absorbent article, the dimension in the CD direction of the composite sheet at the tension application position in the CD direction tension application process corresponds to the through hole formation processing position in the through hole formation process. The dimension of the composite sheet in the CD direction in Therefore, while being transported from the through hole formation processing position to the tension application position, the CD direction dimension of the composite sheet that can be reduced due to the transport tension is at least the CD direction when the through hole is formed. Can be scaled up to And thereby, a tension in the CD direction can be reliably applied to the composite sheet in the CD direction tension application step, and as a result, the fibers at the edge of the through hole of the composite sheet can be reliably loosened.

It is a manufacturing method of a sheet-like member concerning this absorptive article,
The tension in the CD direction is applied in the CD direction tension application step such that the dimension in the CD direction of the through hole at the tension application position is larger than the dimension of the pushing member in the CD direction. It is desirable to do.

According to the method of manufacturing a sheet-like member according to such an absorbent article, the CD is such that the dimension of the through hole at the tension application position in the CD direction is larger than the dimension of the pressing member in the CD direction. In the directional tension application step, tension in the CD direction is applied to the composite sheet. Therefore, while the composite sheet is transported from the through hole forming processing position in the through hole forming step to the tension applying position in the CD direction tension applying step, the CD direction of the composite sheet can be reduced due to the tension for transport. The dimensions can be expanded to at least the dimensions in the CD direction when the through holes are formed. And thereby, a tension in the CD direction can be reliably applied to the composite sheet in the CD direction tension application step, and as a result, the fibers at the edge of the through hole of the composite sheet can be reliably loosened.

It is a manufacturing method of a sheet-like member concerning this absorptive article,
It additionally has a CD direction tension application step of applying tension to the composite sheet in the CD direction on the upstream side of the transport direction from the through hole formation processing position,
In the through hole forming step, it is desirable that the through hole is formed in the composite sheet in a state where the tension in the CD direction is applied.

  According to the method of manufacturing a sheet-like member relating to such an absorbent article, the composite sheet has an elastic member, and when the composite sheet is transported in the transport direction, the composite tension is used as the transport tension. The sheet is tensioned in a direction along the transport direction. Therefore, the sheet can be shrunk in the CD direction by the amount by which the composite sheet is stretched in the conveyance direction by the tension for conveyance. Then, due to this contraction, the fibers of the composite sheet as a whole are shifted from the end side to the center side in the CD direction, and as a result, the composite sheet is in a state where the density of fiber distribution is biased with respect to the CD direction. Then, if the through holes are formed in the composite sheet in an improper state having such a sparse and dense structure, the formation of the through holes may become unstable, and the formation accuracy of the through holes may decrease. According to the manufacturing method of (1), the through hole is formed in the composite sheet in a state where the tension in the CD direction is applied to the composite sheet. Therefore, at the time of formation of the through hole, the composite sheet is changed from the improper state in which the density of the fiber distribution is biased with respect to the CD direction to the proper state in which the deviation of the density is reduced. Formation accuracy can be enhanced.

Also,
An apparatus for manufacturing a sheet-like member having a plurality of through holes formed from a composite sheet continuous in a predetermined direction, comprising:
The first non-woven fabric continuous in the predetermined direction and the second non-woven fabric continuous in the predetermined direction while being overlapped with the first non-woven fabric in the thickness direction of the composite sheet A conveying device for conveying the composite sheet, in which the plurality of elastic members along the predetermined direction are interposed and fixed in a state in which the plurality of elastic members are arranged in the CD direction intersecting the predetermined direction, the conveyance direction being the predetermined direction;
A through hole is formed in the composite sheet to form the through hole penetrating in the thickness direction by pushing a pushing member in the thickness direction to a position between the elastic members adjacent in the CD direction in the composite sheet. Forming device,
CD direction tension applying device that applies tension in the CD direction to the composite sheet at a position downstream of the through hole forming processing position at which the through hole forming device forms the through hole in the composite sheet in the transport direction When,
And a processing device for processing the composite sheet at a position downstream of the tension application position where the CD direction tension applying device applies the tension in the CD direction to the composite sheet. It is a manufacturing apparatus of the sheet-like member which concerns on the absorbent article characterized by the above.

  According to the manufacturing apparatus of the sheet-like member which concerns on such an absorbent article, there can exist an effect similar to the case of the manufacturing method mentioned above.

=== First Embodiment ===
The manufacturing method and manufacturing apparatus of the sheet-like member which concerns on the absorbent article of 1st Embodiment are used, for example in the manufacturing line of the disposable diaper 1 as an example of an absorbent article. FIG. 1 is a schematic perspective view of a three-piece type diaper 1 as an example of a disposable diaper 1 as viewed from the ventral side in a pant-type state. Moreover, FIG. 2 is the schematic plan view which looked at the diapar 1 of the unfolded state from the skin side, and FIG. 3 is III-III sectional drawing in FIG.

The diaper 1 has a vertical direction, a lateral direction, and a longitudinal direction as three directions orthogonal to each other in the pants-type state of FIG. 1. And in the following, in the pants type state, the upper and lower sides in the vertical direction will also be referred to as "circumference opening side" and "crotch side", respectively, and the front and rear sides in the front and rear direction Also referred to as ventral side and dorsal side.
On the other hand, in the unfolded state of FIG. 2 and FIG. 3, the diaper 1 has a longitudinal direction, a lateral direction and a thickness direction as three directions orthogonal to each other. And in the following, in the unfolded state, one side and the other side in the longitudinal direction are also referred to as "ventral side" and "back side", respectively, and one side and the other side in the thickness direction are each Also referred to as "side" and "non-skin side".
Incidentally, in the lateral direction, the pants-type state and the unfolded state have the same meaning. Further, the longitudinal direction of the unfolded state is along the vertical direction of the pant-type state, and the thickness direction of the unfolded state is along the front-rear direction of the pant-type state.
Furthermore, in the unfolded state of FIG. 2 and FIG. 3, the diaper in a state of being virtually expanded assuming that there is no contraction force by the elastic rubbers 16, 35, 45 as elastic members described later for giving the diaper 1 stretchability. 1 is shown.

Since this diaper 1 is a so-called three-piece type, in the unfolded state of FIG. 2, it has an absorbent main body 10 that absorbs excrement as a first part, and a belly band member 31 as a second part, A dorsal band member 41 is provided as a third part. Specifically, in a state where the ventral-side belt member 31 and the back-side belt member 41 are arranged in parallel in the longitudinal direction at intervals, the absorbent main body 10 is stretched between the two members 31 and 41 while the absorbent body is the same. The longitudinal ends 10ea and 10eb of the main body 10 are joined and fixed to the nearest band members 31 and 41, respectively, and the external shape thereof is substantially H-shaped in plan view.
Then, from the developed state of the substantially H shape, the absorbent main body 10 is folded in half with the predetermined position CL10 in the longitudinal 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. When the band members 31 and 41 facing each other are joined by welding or the like at the respective end portions 31e and 41e in the lateral direction, the band members 31 and 41 are annularly connected to each other. Thus, the diaper 1 in a pants-type state in which the waist opening BH and the pair of leg openings LH and LH as shown in FIG. 1 are formed.

  In the unfolded state of FIG.2 and FIG.3, the absorptive main body 10 has comprised the planar view substantially rectangular shape. And the longitudinal direction of the absorptive main body 10 is distribute | arranged so that a longitudinal direction may be followed. In addition, the absorbent main body 10 includes an absorbent body 11, a top sheet 13 provided to cover the absorbent body 11 from the skin side, and a back sheet 15 provided to cover the absorbent body 11 from the non-skin side. Is equipped.

  The absorbent body 11 has a liquid absorbent absorbent core 11 c and a core wrap sheet such as tissue paper (not shown) covering the outer peripheral surface of the core 11 c. The absorbent core 11c is a molded body obtained by forming a predetermined liquid absorbent material into an hourglass shape in a plan view as an example of a predetermined shape. Examples of the liquid absorbent material include liquid absorbent fibers such as pulp fibers, and liquid absorbent granules such as super absorbent polymer (so-called SAP).

The top sheet 13 is a liquid-permeable sheet such as a non-woven fabric of a flat size that protrudes from the absorber 11 in the longitudinal direction and the lateral direction. Further, the back sheet 15 is also a sheet having a flat size which protrudes from the absorber 11 in the longitudinal direction and the lateral 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 impervious leakproof sheet 15a such as a polyethylene film (PE) or a polypropylene film (PP) on the skin side, and a non-woven exterior sheet 15b on the non-skin side. have.
Then, in a state in which the absorbent body 11 is sandwiched between the top sheet 13 and the back sheet 15, the both sheets 13 and 15 are adhered to each other, for example, in a frame shape in a portion protruding from the absorbent body 11 in the longitudinal direction and the lateral direction. The absorbent main body 10 is formed by joining by welding or the like. The back sheet 15 may have only the leak-proof sheet 15 a without having the exterior sheet 15 b.

  Further, as shown in the example of FIG. 2, leg gathers LG that extend and contract in the longitudinal direction may be provided in the portions 10 LG outside the absorbent body 11 in the transverse direction in the absorbent main body 10. The leg gather LG constitutes a part of the leg opening LH. The stretchability of the leg gathers LG is imparted by fixing the rubber thread 16 as an elastic member in the longitudinally extended state to each of the portions 10LG described above. In addition to the leg gathers LG, so-called solid gathers (not shown) may be provided as leak-proof walls on both sides in the lateral direction of the absorbent main body 10 for the purpose of preventing lateral leakage.

  On the other hand, as shown in FIG. 2, the ventral-side band member 31 is a sheet member having a substantially rectangular shape in a plan view, using the non-woven fabrics 32 and 33 as a material. In this example, as shown in FIG. 3, the abdominal band member 31 is formed by joining the non-woven fabrics 32 and 33 in a two-ply manner with a hot melt adhesive. And as shown in FIG.2 and FIG.3, the center part of the horizontal direction of the ventral | abdominal band member 31 is piled up from the non-skin side and joined to the edge part 10ea of the abdominal side of the longitudinal direction in the absorptive main body 10 .

  Similarly to the ventral-side band member 31, the back-side band member 41 is also a sheet member having a substantially rectangular shape in plan view and made of non-woven fabrics 42 and 43 as a material, and in this example, as shown in FIG. The back side band member 41 is formed by joining the non-woven fabrics 42 and 43 in two layers. And as shown in FIG.2 and FIG.3, the center part of the horizontal direction of the back side belt member 41 is piled up from the non-skin side and joined to the edge part 10eb of the back side of the longitudinal direction in the absorptive main body 10 .

  The contents described below are common to both the ventral-side band member 31 and the back-side band member 41. Therefore, here, only the ventral-side band member 31 will be described as a representative of both, and for the back-side band member 41, the reference numerals of the corresponding members are only shown in parentheses.

  As shown in FIGS. 2 and 3, a plurality of thread rubbers are used as elastic members along the lateral direction between two non-woven fabrics 32 and 33 (42, 43) according to the ventral-side belt member 31 (41). 35, 35 (45, 45) are joined and fixed to the same non-woven fabric 32, 33 (42, 43) with a hot melt adhesive under elongation in the lateral direction while being interposed in line in the longitudinal direction. And thereby, the stretchability of the horizontal direction is provided to the ventral | abdominal band member 31 (41).

Further, in this example, as shown in FIG. 2, at least a part (for example, the central part in the lateral direction) of the portion overlapping the absorbent core 11 c in the ventral-side band member 31 (41) The rubber thread 35 (45) is discontinuous for the purpose of preventing the occurrence and the like. And thereby, elasticity is not provided about this part.
That is, as shown in a schematic plan view of the ventral band member 31 of FIG. 4 viewed from the non-skin side in the thickness direction, the ventral band member 31 (41) is divided into two regions AU and AD in the longitudinal direction; Then, when the region AU located on the side of the waist opening BH in the vertical direction is referred to as "upper region AU" and the region AD located on the crotch side is referred to as "lower region AD", the upper region of the former The absorbent core 11 c of the absorbent main body 10 does not substantially overlap AU. Therefore, the upper region AU is provided with stretchability over substantially the entire length in the lateral direction. That is, in the upper area AU, thread rubbers 35, 35 (45, 45) are provided over substantially the entire length in the lateral direction.

  On the other hand, in the latter lower region AD, since the absorbent core 11c of the absorbent main body 10 overlaps the lateral central region ADc, thread rubbers 35, 35, ... are formed in the central portion of the central region ADc. A non-stretchable area AL having almost no horizontal stretchability is present at the center of the central area ADc, which is not disposed. However, since the absorbent core 11c does not generally overlap with the end side areas ADe and ADe located on both sides of the central area ADc, the thread rubbers 35, 35 ... (45, 45 are arranged, whereby the same end side areas ADe, ADe are elastic areas AH, AH having elasticity higher than the above non-elastic area AL. The formation of the non-stretchable area AL and the stretchable area AH in the lower area AD can be achieved by the continuous body 35a (45a) of thread rubber disposed laterally across the above-mentioned central portion (see FIG. 8A and FIG. 8B) is performed by cutting at the central portion, but such a cutting process will be described later.

  Moreover, as a fineness of this thread rubber 35 (45), 400 dtex-1000 dtex can be illustrated, and LYCRA (trademark) etc. can be illustrated as a specific example of thread rubber 35 (45), for example. However, it is not limited to this at all.

  Furthermore, in this example, as shown in FIG. 3, the planar size of the non-woven fabric 33 (43) positioned on the non-skin side in the thickness direction of the two non-woven fabrics 32, 33 (42, 43) is the skin side The non-woven fabric 32 (42) located on the upper side of the non-woven fabric 32 is sized to protrude outward in the longitudinal direction. And the part which protrudes in the former nonwoven fabric 33 (43) is turned back inside in the longitudinal direction, and this folded part 33B (43B) is the end 32Le (42Le) of the longitudinal direction of the latter nonwoven fabric 32 (42). Is covered from the skin side, but it is not limited to this at all.

  Further, as shown in FIG. 2 and FIG. 4, on both sides in the lateral direction in the above-mentioned ventral-side band member 31 (41), a portion 31s where the absorbent main body 10 is not overlapped including the above-mentioned end side area ADe. (41s) (hereinafter, also referred to as an absorbent main body absent portion 31s (41s)), the absorbent main body absent portion 31s (41s) has the same property as the above for the purpose of improving its air permeability. A plurality of air holes h (h) penetrating the non-existing portion 31s (41s) are discretely formed in a predetermined arrangement pattern, whereby the air holes h (h) are a group of air holes h. A vent group Gh31 (Gh41) is formed. That is, in this example, a plurality of air vents h, h ... (at positions between the rubber threads 35, 35 (45, 45) longitudinally adjacent to each other in the absorbent main body absent portion 31s (41s) ) are formed side by side at a predetermined formation pitch in the lateral direction, whereby the vent holes h, h... (h, h. ). Further, the vent hole rows Rh31 and Rh31 (Rh41 and Rh41) adjacent to each other in the longitudinal direction are mutually shifted in the lateral direction by the half value of the formation pitch. .. (H, h...) Form a group of vent holes Gh 31 (Gh 41) arranged in a substantially staggered arrangement. However, it is not limited to this at all. For example, the vent holes h, h... (H, h...) May be formed in a lattice arrangement.

  Furthermore, in this example, each vent hole h, h ... is formed with a target circle shape having a diameter of, for example, 0.2 mm to 3 mm as a target opening shape. There are also pores h, h. And although the diameter of such a non-round-shaped air hole h is fluctuated according to the position of the circumferential direction of the air hole h, it is 0.2 mm-about 3 mm, for example also about this fluctuating diameter. It is included. Therefore, each air vent h can achieve the desired air permeability promptly. However, the target opening shape of the vent hole h is not limited to the above-mentioned perfect circle. For example, it may be a polygon such as an equilateral triangle or a square.

  5A shows a schematic enlarged view of the vent hole h from the non-skin side in the thickness direction, and FIG. 5B shows a cross-sectional view taken along the line B-B in FIG. 5A. As can be seen with reference to FIG. 5, a burr B protrudes at the edge he of the vent h. That is, since the same edge he is densely present in the non-woven fabrics 32, 33 (42, 43) with the fibers pushed away by the pin member 55p described later, the edge he is more than the other portions. As well as being a unevenly distributed portion in which many fibers are present, the same edge portion he is a high entangled strength portion in which the constituent fibers are strongly entangled. And if such uneven distribution and entanglement strength become excessive, problems as described at the outset can occur. Therefore, in the manufacturing line of the diaper 1 to be described later, the step S60 (FIG. 6) for loosening the fibers of the edge portion he is provided, thereby reducing uneven distribution of fibers at the edge portion he in the diaper 1 It is done.

  Furthermore, in this example, a spunbond nonwoven fabric is used for both of the two non-woven fabrics 32 and 33 related to the ventral-side band member 31 and the two non-woven fabrics 42 and 43 related to the back-side band member 41. However, the present invention is not limited to this, and another type of non-woven fabric such as SMS (spun bond / melt blown / spun bond) non-woven fabric may be used. Moreover, in this example, although the single fiber of polypropylene (PP) of the representative example of a thermoplastic resin is used as a constituent fiber of a nonwoven fabric, it is not restricted to this at all. For example, a single fiber of another 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, 1 m of intermediate products of diaper 1 are conveyed along a predetermined conveyance direction (equivalent to a conveyance process). Then, during the transportation, the intermediate product 1m is subjected to various treatments, and the form of the intermediate product 1m is sequentially changed every time each treatment is applied, and finally, as shown in FIG. Diaper 1 is completed.

  In addition, below, the thing of the width direction of a manufacturing line is also called "CD direction." Also, in this example, the CD direction is along the horizontal direction. And in this manufacturing line, 1 m of intermediate products are conveyed by making arbitrary directions in the plane which intersects perpendicularly with this CD direction the conveyance direction. That is, the transport direction is directed in the direction defined by both the vertical direction and the vertical direction. In addition, the "vertical direction" and the "front-back direction" said here are another directions which are not directly related to the "vertical direction" and the "front-back direction" which were respectively used by description of the diapar 1 mentioned above.

  Further, the intermediate product 1m is transported by an appropriate transport device such as a belt conveyor or a transport roller. Therefore, unless otherwise specified, it is assumed that the intermediate product 1m is transported in the transport direction by these transport devices. In addition, as an example of a belt conveyor, the normal belt conveyor which had the endless belt drive-rotated as a conveyance surface, the suction belt conveyor etc. which had the adsorption | suction function on the outer peripheral surface of an endless belt can be mentioned.

  FIG. 6 is a schematic plan view of the same line for explaining various processes performed in the manufacturing line. The production line includes a vent forming step S50 (corresponding to a through hole forming step), a CD direction tension applying step S60, a slit step S70 (corresponding to a processing step), and a gap forming step S75 (corresponding to a processing step) Belly side thread rubber cutting step S80 (corresponding to processing step), back side thread rubber cutting step S90 (corresponding to processing step), absorbent main body attaching step S100 (corresponding to processing step and separate member fixing step), A folding step S110 (corresponding to a processing step), a side seal step S120 (corresponding to a processing step), and a cutting step S130 (corresponding to a processing step) are included. And each position which performs each of these processes S50-S130 is located in a line in this order from the upstream of a conveyance direction to the downstream.

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

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

  More precisely, the sheet-like member 30mf has a size in the CD direction corresponding to the sum of the longitudinal dimension of the non-woven fabric 32 of the ventral-side band member 31 and the longitudinal dimension of the non-woven fabric 42 of the back-side band member 41 To the added value of the continuous dimension of the continuous non-woven fabric 30mf1 (corresponding to the first non-woven fabric) continuous in the transport direction while having and the dimension of the non-woven fabric 33 of the ventral-side band member 31 in the longitudinal direction A continuous non-woven fabric 30mf2 (corresponding to a second non-woven fabric) continuous in the transport direction while having a size in the corresponding CD direction. And these continuous nonwoven fabrics 30mf1 and 30mf2 are joined by the hot melt adhesive agent in the state of the two-layer superposition | stacked piled up in the thickness direction. Further, between the continuous non-woven fabrics 30mf1 and 30mf2, continuous bodies 35a and 45a of a plurality of thread rubbers to be the above-described plurality of thread rubbers 35 and 45 are continuous along the transport direction in a stretched state in the transport direction. However, it is inserted in a state of being lined up in the CD direction and fixed to the continuous nonwoven fabrics 30mf1 and 30mf2. Furthermore, the size of one continuous nonwoven fabric 30mf2 of the two continuous nonwoven fabrics 30mf and 30mf2 is larger in the CD direction than the other continuous nonwoven fabric 30mf1, whereby the former one continuous nonwoven fabric 30mf2 is The latter continuous non-woven fabric 30mf1 has portions 30mf2p1 and 30mf2p2 protruding on both sides in the CD direction. The respective projecting portions 30mf2p1 and 30mf2p2 are respectively folded back inside in the CD direction, thereby forming portions corresponding to the above-described folded portions 33B and 43B.

  Then, in the air vent forming step S50, as shown in FIG. 7B, the ventral side band in the region in the CD direction with respect to the intermediate product 1m of FIG. 7A which is the sheet-like member 30mf (corresponding to a composite sheet). A pair of vent holes Gh31 and Gh31 of the member 31 are repeatedly formed at the product pitch P1 in the transport direction, and a pair of vent holes Gh41 and Gh41 of the back side band member 41 are each transported in the transport direction in the other side area. It forms repeatedly by product pitch P1. The product pitch P1 referred to here is substantially the same as the total lengths L31 and L41 in the lateral direction of the ventral-side band member 31 and the back-side band member 41 in the unfolded state of FIG.

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

  In the next slitting step S70, as shown in FIG. 6, the sheet-like member 30mf is divided into two in the CD direction, whereby the continuum 31a of the ventral-side band member in the continuous state of the thread rubber continuum 35a is not cut. And the continuous body 45a of thread rubber produces the continuous body 41a of the back side band member of an uncut state.

  In the next interval forming step S75, the continuum 31a of the ventral-side band member as the intermediate product 1m and the continuum 41a of the back-side belt member are respectively moved to the outside in the CD direction. And thereby, the magnitude | size corresponded to the space | interval Ld of the vertical direction between the belly side belt member 31 and the back side belt member 41 in the diaper 1 of the expansion | deployment shape of FIG. 2 between CD directions of these continuous bodies 31a and 41a. Form an interval.

  In the next belly side thread rubber cutting process S80, when the above-mentioned continuum 31a of the belly side belt member passes, the continuum 35a of the thread rubber is cut in the area AL1 corresponding to the non-stretching area AL in the same body 31a. Thereby, the non-stretchable area AL is formed in the continuum 31a of the ventral-side band member. The details are as follows.

First, in the ventral belt member continuum 31a, as shown in the schematic plan view of FIG. 8A, the region on one side in the CD direction corresponds to the upper region AU in the ventral belt member 31 described above, and the other side The area also corresponds to the lower area AD. And at this time, the continuous body 35a of thread rubber is distribute | arranged to the said conveyance direction along the conveyance direction at any area | region. However, in the former one side area corresponding to the upper area AU, a continuous body 35a of thread rubber is fixed by a hot melt adhesive over the entire length in the transport direction, but the latter corresponding to the lower area AD In the other side area, a fixed area AH1 to which the continuum 35a of thread rubber is fixed and a non-fixed area AL1 not fixed are present in the transport direction. The non-fixed region AL1 is present at the product pitch P1 in the transport direction and the size of the non-stretchable region AL described above in the transport direction.
Therefore, as shown in the right part of FIG. 8B, when the continuous body 35a of thread rubber is cut at the predetermined position PC of the non-fixed area AL1, the downstream end 35aed of the continuous body 35a of thread rubber is the same continuous body 35a It is separated from Then, the upstream portion 35eu of the separated rubber thread 35 contracts toward the fixing area AH1 located downstream thereof. Further, based on the above-mentioned cutting, the portion 35aedn which has become the new downstream end of the continuum 35a of thread rubber contracts toward the fixing area AH1 located on the upstream side. And thereby, as shown in the left part of FIG. 8B, non-fixed area AL1 will be in the state where thread rubber 35 does not exist, as a result, the non-fixed area AL1 turns into the above-mentioned non-stretching area AL. On the other hand, as shown in FIG. 8B, in the fixing area AH1, the above-mentioned separated rubber thread 35 and the portion 35aedn which has become the new downstream end based on the fixation with the hot melt adhesive. Since each of the fixing portions AH stays, stretchability is given to the fixing area AH1 by the thread rubber 35. And thereby, the said fixed area | region AH1 turns into the above-mentioned expansion-contraction area | region AH.

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

  In the next absorbent main body attaching step S100, single sheets generated in a separate step not shown on the continuous members 31a and 41a of the respective band members sent as the intermediate product 1m from the respective thread rubber cutting steps S80 and S90 described above The intermediate product 1m is stretched and fixed, whereby the continuous product 1Ha of a substantially ladder-like diaper in which the intermediate products 1m are continuously formed by the diapers 1H, 1H ... expanded in the substantially H shape of Fig. 2 In the form of

  In the next folding step S110, the continuous product 1Ha of a substantially ladder-like diaper, which is an intermediate product 1 m, is formed in such a manner that the continuous body 31a of the ventral side belt member and the continuous body 41a of the dorsal side belt member overlap vertically in the thickness direction. Unfold.

  In the next side sealing step S120, the continuous body 31a of the ventral-side band member and the continuum 41a of the back-side band member stacked vertically in the double-folding step S110 correspond to the lateral end portions 31e and 41e of the diaper 1. It welds at a position and forms side seal part SS, and, thereby, it fixes in a half-folded state. And as a result, 1 m of intermediate products will be in the form of the continuous body 1a of the underpants type diaper in which a plurality of underpants type diapers 1, 1.

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

  Hereinafter, each step S50 to S100 will be described in more detail, but here it is apparent that each step S110 to S130 after the folding step S110 can be realized by a well-known method as appropriate, and therefore further description will be made. do not do.

<<< vent hole formation process S50 >>>
In the vent formation step S50, a vent forming device 50 (corresponding to a through hole forming device) for forming the vent h in the sheet-like member 30mf is disposed. FIG. 9 is a schematic side view of the same device 50 showing a part of the configuration (the upstream roll 51 and the downstream roll 58) in a longitudinal cross-sectional view, and FIG. 10 is a schematic view of XX in FIG. It is an enlarged view.
As shown in FIG. 9, the vent forming device 50 has three rolls 51, 55, 58 which are driven to rotate about a rotation axis along the CD direction. That is, from the upstream side to the downstream side in the transport direction, the rolls 51, 55, 58 are arranged side by side in the order of the upstream side roll 51, the intermediate roll 55, and the downstream side roll 58. Further, the intermediate roll 55 is disposed close to each of the rolls 51 and 58 so that the outer peripheral surface of both the upstream roll 51 and the downstream roll 58 face each other. And said sheet-like member 30mf sent as the intermediate product 1m to the vent hole formation apparatus 50 is conveyed by the conveyance route of substantially ohm shape based on rotation operation of these three rolls 51, 55, 58. . That is, first, the sheet-like member 30 mf is conveyed by the arc-shaped first conveyance route R 51 in a state of being wound around the upstream side roll 51, and then the arc-shaped second state is in a state of being wound around the intermediate roll 55. The sheet is conveyed by the conveyance route R55, and finally conveyed by the arc-like third conveyance route R58 in a state of being wound around the downstream side roll 58. Then, after that, the sheet-like member 30 mf is separated from the downstream side roll 58 and delivered to the CD direction tension applying step S60 of the next step.
The upstream roll 51 and the intermediate roll 55 are closest to each other at the predetermined position P51 in the rotation direction Dc51 of the upstream roll 51, but this closest position P51 is the first conveyance route R51 to the second conveyance route It is a position switched to R55. Similarly, the intermediate roll 55 and the downstream side roll 58 are closest to each other at the predetermined position P55 in the rotational direction Dc55 of the intermediate roll 55, but this closest position P55 is the third conveyance route from the second conveyance route R55. It is a position switched to R58.

  The intermediate roll 55 has a plurality of pin members 55p, 55p... (Push-in members) protrudingly formed on the outer peripheral surface. Each of the pin members 55p, 55p... Is a member whose tip end is tapered. That is, as shown in FIG. 10, in this example, the pin member 55p has a conical portion 55pa on the tip end side, and integrally has a cylindrical portion 55pb having the same diameter as the bottom surface of the conical portion 55pa on the root side. . Further, the outer peripheral surface of the upstream side roll 51 has holes 51h, 51h... Into which the pin members 55p, 55p. That is, the hole 51 h has a diameter larger than the diameter of the conical portion 55 pa of the pin member 55 p in the range in which the pin member 55 p is inserted. And each hole 51 h is formed corresponding to each pin member 55 p so that only one pin member 55 p is inserted into one hole 51 h at the closest position P 51 described above.

Therefore, as shown in FIG. 10, when the portion to be formed in the sheet-like member 30mf located on the upstream side roll 51 of FIG. 9 for forming the vent hole h passes the closest position P51, as shown in FIG. By inserting the corresponding pin members 55p into the holes 51h of the roll 51, the pin members 55p are smoothly pushed into the formation target portion of the sheet-like member 30mf, whereby the formation target portions are formed. The vent hole h is rapidly formed through.
By the way, in this example, since the vent hole h is formed at the closest position P51 as described above, in the following, the closest hole forming processing position P51 (corresponding to the through hole forming processing position) Also say.

  Further, as shown in the enlarged view of the main part in FIG. 10, when forming the air vent h, the two continuous non-woven fabrics 30mf1 and 30mf2 constituting the sheet-like member 30mf are in the thickness direction by the pin member 55p. Can be pushed into Then, at the edge he of the air vent h, the fibers of the continuous non-woven fabric 30mf1 pushed away by the pin member 55p and the constituent fibers of the continuous non-woven fabric 30mf2 are densely present together, whereby the edge he Is a unevenly distributed portion in which there are more constituent fibers than the other portions, and is a high entangled strength portion in which the constituent fibers are strongly entangled with each other. And when such uneven distribution or entanglement strength is excessive, the touch feeling at the edge he of the vent hole h is deteriorated, and the sheet-like member 3mf is subjected to another processing after the vent hole h is formed. In addition, since the sheet-like member 30 mf is processed in an improper state in which the influence of the formation process of the vent holes h as described above is excessively left, the processing accuracy may be deteriorated. Therefore, in the manufacturing method and the manufacturing apparatus, the above-mentioned CD direction tension applying step S60 is provided. That is, in the step S60, the fibers of the edge portion he of the air hole h formed in the sheet member 30mf are loosened, and thereafter, the sheet member 30mf is sent to the processing steps S70 to S130. The details of the CD direction tension application step S60 will be described later.

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

  Further, in this example, the intermediate roll 55 of FIG. 9 forms the vent holes Gh31, Gh31, Gh31, Gh41, Gh41, Gh41, Gh41, Gh41 for two diapers per rotation as shown in FIG. 7B. The large diameter roll has a circumferential length corresponding to approximately twice the above-mentioned product pitch P1. On the other hand, the upstream side roll 51 of FIG. 9 has a circumferential length substantially corresponding to the product pitch P1 so that the vent holes Gh31, Gh31, Gh41, Gh41 for one diaper shown in FIG. 7B can be formed per one rotation. Small diameter roll. However, it is not limited to this at all.

  FIG. 11 is an explanatory view of an arrangement pattern of the pin members 55p on the outer peripheral surface of the intermediate roll 55, and FIG. 12 is an explanatory view of an arrangement pattern of the holes 51h on the outer peripheral surface of the upstream side roll 51. In each of the drawings, the outer peripheral surface of each of the rolls 55 and 51 is shown developed on a plane. Further, in FIG. 11, a receiving portion 55 r described later is not illustrated for the purpose of preventing the drawing from being confused.

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

  Further, in this example, as described above, since the intermediate roll 55 forms the vent holes h for two diapers in one rotation, the pair of pin member groups G55p1, G55p1 (G55p2, G55p2) aligned in the rotational direction Dc55. ) Is used as one set of pin member group set SG55p1 (SG55p2), two sets of pin member group sets SG55p1 and SG55p1 (SG55p2, SG55p2, with an equal pitch of 180 ° in the rotational direction Dc55) on the outer peripheral surface of the intermediate roll 55. SG55p2) are provided side by side.

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

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

  Further, in the example of FIG. 13B, the position of the top surface 55rt of the receiving portion 55r is located more inward than the position of the vertex of the pin member 55p in the rotational radial direction Dr55 of the intermediate roll 55. And thereby, it is preventing that receiving part 55r disturbs penetration formation processing of ventilation hole h by pin member 55p. Here, desirably, the top surface 55rt of the receiving portion 55r may be located in the vicinity of the bottom surface of the conical portion 55pa of the pin member 55p. For example, the top surface 55rt relates to the position of the rotation radial direction Dr55. It is good to be in the range of ± 2 mm centering on the position of the above-mentioned bottom. And, in this example, the top surface 55rt coincides with the bottom surface of the conical portion 55pa. Thus, the receiving portion 55r can reliably receive the sheet-like member 30mf without substantially interfering with the process of forming the through hole h of the pin member 55p. And thereby, the pin member 55p can form the vent hole h rapidly with respect to the sheet-like member 30mf.

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

  On the other hand, as shown in FIG. 12, the hole 51 h on the outer peripheral surface of the upstream roll 51 is provided in correspondence with the pin member 55 p. That is, as shown in FIG. 11, a pair of pin member groups G55p1 and G55p1 are provided side by side in the rotational direction Dc55 in the region on one side in the CD direction on the outer peripheral surface of the intermediate roll 55. Then, in a region on one side in the CD direction on the outer peripheral surface of the upstream roll 51, a pair of hole portion groups G51h1 and G51h1 having a plurality of hole portions 51h in a staggered arrangement are provided side by side in the rotation direction Dc51 There is. Similarly, as shown in FIG. 11, in the region on the other side in the CD direction on the outer peripheral surface of the intermediate roll 55, a pair of pin member groups G55p2 and G55p2 are provided side by side in the rotational direction Dc55. Correspondingly, in an area on the other side in the CD direction on the outer peripheral surface of the upstream roll 51, hole group groups G51h2 and G51h2 having a plurality of holes 51h in a staggered arrangement are provided in a pair in the rotational direction Dc51. ing.

  However, as described above, since the upstream side roll 51 participates in the formation of the ventilation holes h for one diaper in one rotation, the pair of hole groups G51h1 and G51h1 (G51h2 and G51h2) aligned in the rotation direction Dc51 In the case where one set of hole portion group set SG51 h 1 (SG 51 h 2) is used, only one set of such hole portion group set SG 51 h 1 (SG 51 h 2) is provided on the outer peripheral surface of the upstream roll 51.

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

  By the way, as a standard of heating, for example, the temperature of the pin member 55p is higher than the softening point of the above-mentioned thermoplastic resin and lower than the melting point. The softening point can be determined by TMA (thermomechanical analysis) of JIS K 7196 (Method for testing softening temperature of thermoplastic films and sheets by thermomechanical analysis). The melting point can be determined as the melting peak temperature in DSC (differential scanning calorimetry) of JIS K 7121 (Method of measuring transition temperature of plastic).

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

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

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

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

  As shown in FIGS. 14A and 14B, the position adjustment mechanism 60A is, for example, disposed so that the outer peripheral surfaces thereof face each other so as to sandwich the end 30mfe of the sheet 30mf in the CD direction from both sides in the thickness direction. An actuator 60d that rotationally drives a pair of rotating upper and lower nip rollers 60Ru and 60Rd and a pair of upper and lower nip rollers 60Ru and 60Rd around a support axis C60A in a plane having both the transport direction and the CD direction, and the same nip roller A sensor 60s such as a phototube, which is disposed immediately downstream of 60Ru and 60Rd and measures the position of the end 30mfe in the CD direction and outputs a measurement signal, and controls the actuator 60d based on the measurement signal from the sensor 60s. And a controller (not shown).

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

  The target position is previously set to a position where tension in the CD direction is applied to the sheet-like member 30 mf. That is, in this example, the sheet-like member 30mf has a continuous body of thread rubber 35a, 35a ... (45a, 45a ...) along the conveyance direction, and the sheet-like member 30mf is used for conveyance Tension is applied along the transport direction. Therefore, the sheet-like member 30 mf shrinks in the CD direction due to the tension for conveyance. That is, the dimension in the CD direction is reduced along with the transportation. And in this example, the above-mentioned target position is set up in a position outside the direction of CD rather than the position of each end 30mfe of sheet shaped member 30mf in this contracted state. Therefore, tension in the CD direction is applied to the sheet-like member 30 mf by adjusting each end 30 mfe to be at the target position.

  Further, in this example, as described above, the pair of upper and lower nip rollers 60Ru and 60Rd perform the above-described turning operation while sandwiching the end 30mfe of the sheet-like member 30mf in the CD direction from both sides in the thickness direction. The tension in the CD direction is applied to the second member 30mf. Therefore, the "tension application position" according to the claim, that is, the "position for applying tension in the CD direction to the sheet-like member 30mf" is a nip position P60 at which the pair of upper and lower nip rollers 60Ru and 60Rd sandwich the sheet-like member 30mf. It is almost the same position as Therefore, in the following, this nip position P60 is also referred to as "tension application position P60".

  Here, desirably, the magnitude relationship between the dimensions of the sheet-like member 30 mf in the CD direction may be set as follows by adjusting the target position described above. That is, the dimension L30mfk (FIG. 14A) of the sheet-like member 30mf at the tension applying position P60 in the CD direction tension applying step S60 corresponds to the vent hole forming processing position P51 in the air hole forming step S50. It is preferable that the dimension L30 mfh or more of the sheet-like member 30 mf in the CD direction be equal to or more than that. Then, in this way, the dimension in the CD direction of the sheet-like member 30mf which can be reduced while being transported from the vent formation processing position P51 to the tension application position P61 is at least when the vent h is formed. Can be enlarged to the dimension L30 mfh in the CD direction of Thus, in the CD direction tension applying step S60, the tension in the CD direction can be reliably applied to the sheet member 30mf, and as a result, the fibers of the edge portion he of the air hole h of the sheet member 30mf can be assured You can relax.

  Further, the adjustment of the target position described above may be performed with the following as a guide. That is, the target position is set such that the dimension of the vent hole h at the tension applying position P60 in the CD direction is larger than the maximum dimension L55pa of the conical portion 55pa of the pin member 55p in FIG. 10 in the CD direction. You may. And, even in this way, while being transported from the air vent forming step S50 to the CD direction tension applying step S60, at least the vent hole h is formed in the CD direction of the sheet-like member 30mf which can be reduced. It can be expanded to the dimension L30 mfh in the CD direction at the time. Therefore, in the CD direction tension applying step S60, the tension in the CD direction can be reliably applied to the sheet member 30mf, and as a result, the fibers in the edge portion he of the air hole h of the sheet member 30mf can be reliably loosened. Can.

  On the other hand, in this example, as shown in FIG. 6, the tension applying position P60 of the CD direction tension applying step S60 is the vent hole of the air vent forming step S50 among the above steps S70 to S130 corresponding to the processing step. It is provided between the position of slit process S70 which is processing process S70 closest to formation processing position P51, and the vent hole formation processing position P51 concerned. Thus, the tension in the CD direction is applied to the sheet-like member 30 mf in which the vent hole h is already formed at the position immediately downstream of the vent hole formation processing position P51. Therefore, from the processing step S70 on the most upstream side of the processing steps S70 to S130 located downstream of the air vent formation processing position P51, the fibers of the edge portion he of the air hole h are in the state of the sheet member 30mf. It can be put in a relaxed state. Therefore, the sheet-like member 30mf can be processed with high processing accuracy in all the processing steps S75 to S130 located downstream of the most upstream processing step S70 including the slitting step S70.

When the intermediate roll 55 (corresponding to the first rotating body) described above with reference to FIG. 9 is a heating roll heated by the heating device as described above, the sheet-like member 30 mf is formed by the intermediate roll 55. Is also heated, in which case it is desirable that it be as follows. That is, the application of tension in the CD direction to the sheet-like member 30 mf performed in the CD-direction tension applying step S60 is such that the temperature of the sheet-like member 30 mf is higher than the temperature before heating by the intermediate roll 55 Good to be done from time to time.
And if it becomes like this, the fiber can be loosened in the state where the fiber of edge part he of air hole h of sheet-like member 30mf is softened, and it becomes easy to loosen the said fiber by this. Note that, instead of or in addition to the intermediate roller 55, the upstream roller 51 (corresponding to the second rotating body) or the downstream roller 58 of FIG. 9 is heated by a heating device (not shown) such as an electric heater. It may be a heated heating roll. Also in this case, the sheet-like member 30mf can be heated by the rolls 51 and 58, whereby the same function and effect as those described above can be obtained.

<<< Slitting process S70 >>>
As shown in FIG. 6, in the slitting step S70, the sheet-like member 30mf sent from the CD direction tension applying step S60 in the upper step is a boundary position BL between the region on one side and the other side in the CD direction (FIG. 7B Divide in two). Thus, the continuous body 31a of the ventral-side band member in the uncut state of the continuous body 35a of thread rubber and the continuous body 41a of the back-side band member in the uncut state of the continuous body 45a of the thread rubber are arranged in the CD direction. It is generated in the dead state (FIG. 6).

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

<<< Space formation process S75 >>>
As shown in FIG. 6, in the space forming step S75, the continuum 31a of the ventral-side band member and the continuum 41a of the dorsal side belt member sent from the slitting step S70 of the upper step are respectively moved to the outside in the CD direction. Thus, between the continuous bodies 31a, 41a in the CD direction, a size corresponding to the longitudinal distance Ld between the ventral-side band member 31 and the back-side band member 41 in the expanded shape diaper 1 of FIG. Form an interval.

  In addition, about the movement to the outside of the CD direction of the continuum 31a of the ventral side belt member and the movement to the outside of the CD direction of the back side belt member, a plurality of these along the transport path considering the movement. This can be realized by arranging the transport roller (not shown) of the above, and the contents thereof can be conceived from the above description. Therefore, further description is omitted.

<<< Alt side thread rubber cutting process S80 >>>
In ventral thread rubber cutting step S80, as shown in FIG. 8B with respect to continuum 31a of ventral side band member of FIG. 8A sent from interval forming step S75 of the upper step, non-fixing corresponding to non-stretchable area AL In the area AL1, the continuum 35a of the thread rubber is cut, while in the fixing area AH1 corresponding to the stretch area AH, the continuum 35a of the thread rubber is not cut. And thereby, the non-contraction area | region AL and the expansion-contraction area | region AH are formed in the continuous body 31a of a ventral | abdominal band member. In addition, area | region AL1 corresponding to non-contraction area | region AL appears with the product pitch P1 of the diapar 1 in a conveyance direction. Therefore, the cutting process is performed at the product pitch P1 of the diaper 1 with respect to the continuum 31a of the ventral-side band member.

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

The ventral-side cutter device 80 has a pair of upper and lower rolls 81u and 81d that drive and rotate around a rotation axis along the CD direction while making the outer peripheral surfaces 81ua and 81da of each other face each other. Then, a plurality of cutter blades C, C,... Are formed protrudingly on the cutter block 84 of the outer peripheral surface 81ua of the upper roll 81 u in correspondence with the predetermined positions PC, PC. 81da is a smooth surface to receive the cutter blades C, C. Further, these rolls 81 u and 81 d are controlled to rotate in conjunction with the conveying operation of the continuum 31 a of the ventral-side band member, whereby the above-mentioned non-fixed area AL1 corresponding to the non-stretchable area AL passes Every time the cutter roll 81 u rotates so that the cutter block 84 faces the non-fixed region AL1. Then, thereby, each time the non-fixed region AL1 corresponding to the non-stretchable region AL in FIG. 8A passes between the outer peripheral surfaces 81ua and 81da of the pair of rolls 81u and 81d, the non-fixed region AL1 The cutter blades C, C,... Of the cutter block 84 of the cutter roll 81 u and the outer peripheral surface 81 da of the anvil roll 81 d press. Then, the continuous bodies 35a, 35a... Of the respective rubber threads are cut at the respective pressed positions PC.
<<< Backside thread rubber cutting process S90 >>>
As shown in FIG. 6, in the back thread rubber cutting step S90, the continuous body 41a of the back band member sent from the interval forming step S75 in the upper step is described with reference to FIGS. 8A and 8B. Perform the same cutting process as in. That is, in the area AL1 corresponding to the non-stretchable area AL, the continuous body 45a of thread rubber is cut, and in the area AH1 corresponding to the stretch area AH, the continuous body 45a of thread rubber is not cut. And thereby, the non-contraction area | region AL and the expansion-contraction area | region AH are formed in the continuous body 41a of a back side band member. As can be seen from the above, the cutting process is substantially the same as the above-mentioned belly-side thread rubber cutting step S80, and the configuration of the back side cutter device 90 of FIG. It is the same as that of the cutter device 80. Therefore, the detailed description is omitted here.

<<< Absorbent Body Mounting Step S100 >>>
In the absorbent main body attaching process S100, as shown in FIG. 6, the continuous members 31a and 41a of the respective band members to be sent as the intermediate product 1m from the respective thread rubber cutting processes S80 and S90 in the upper process are not shown. The single-sheet absorbent main body 10 generated in the process is stretched and fixed, whereby the intermediate product 1m is formed into a series of diapers 1H, 1H,.. In the form of a continuous diaper 1Ha.

In addition, about implementation of the attachment process of this absorptive main body 10, for example, the rotary drum (not shown) which has several holding parts which carry out adsorption holding of the absorptive main body 10 to a peripheral face side by side at product pitch P1. Such rotating drums are well known. Therefore, the detailed description is omitted.

=== Second Embodiment ===
FIG. 16 is a schematic explanatory view of the manufacturing method of the second embodiment.
In the first embodiment described above, as shown in FIG. 6, the tension application position P60 of the CD direction tension application step S60 is located between the air hole forming step S50 and the slit step S70 in the transport direction, In the second embodiment, as shown in FIG. 16, the tension application position P60 of the CD direction tension application step S60 is located downstream of the slit step S70. And since the sheet-like member 30mf is divided into the continuum 31a of the ventral | abdominal band member and the continuum 41a of the back | dorsal band member in the position more downstream than this slit process S70, these each continuum 31a , And 41a, mainly in that CD direction tension applying steps S60 and S60 are provided. The other points are substantially the same as those in the first embodiment described above. Therefore, the same reference numerals are given to the same configuration, and the description thereof will be omitted.

  As shown in FIG. 16, in this second embodiment, the tension application position P60 of the CD direction tension applying step S60 for the continuum 31a of the ventral side belt member is the belly side rubber thread cutting step S80 and the absorbent main body in the transport direction. The tension application position P60 of the CD direction tension application step S60 for the continuous member 41a of the back side band member located between the attachment step S100 and the back side thread rubber cutting step S90 and the absorbent main body in the transport direction It is located between the attachment step S100. And, CD direction tension applying devices 60, 60 are provided at the tension applying positions P60, P60, respectively. That is, the CD direction tension applying device 60 for the continuum 31a of the ventral side band member has the position adjusting mechanisms 60A and 60A on both sides in the CD direction as described above, and the ventral side band is obtained by the mechanisms 60A and 60A. Tension in the CD direction is applied to the continuous body 31a of the members. Similarly, the CD direction tension applying device 60 for the back band member continuum 41a also has position adjusting mechanisms 60A and 60A on both sides in the CD direction, respectively, and the back wall members are continuous by the same mechanism 60A and 60A. Tension in the CD direction is applied to the body 41a. The configuration of the position adjustment mechanisms 60A, 60A,... Is the same as that described in the first embodiment. Therefore, the detailed description is omitted.

In both of the second embodiment of FIG. 16 and the first embodiment of FIG. 6, the belly-side band member is located upstream of the tension applying position P60 in the CD direction tension applying step S60 in the conveyance direction. And the process which fixes another member, such as absorptive main part 10, with respect to each continuous body 31a of the back side belt member and 41a or sheet-like member 30mf does not exist. That is, in the second and first embodiments, the tension in the CD direction is applied to each continuous body 31a, 41a or the sheet-like member 30mf in which the vent hole h has been formed before the separate member is fixed. It is supposed to be.
Therefore, according to the second and first embodiments, a failure that occurs when applying a tension in the CD direction after the fixing of the separate member, that is, the tension is received by the separate member and the respective tension is It becomes difficult to transmit to the continuous body 31a, 41a or the sheet-like member 30mf, and it is possible to effectively prevent the decrease in the function of loosening the fibers of the edge portion he of the vent hole h.

  By the way, depending on the case, the production line of the second embodiment shown in FIG. 16 is not limited to the respective CD direction tension applying processes S60 and S60 for the continuum 31a of the ventral side belt member and the continuum 41a of the back side belt member, You may have CD direction tension provision process S60 for sheet-like member 30mf described in 1st Embodiment of FIG.

=== Third Embodiment ===
FIG. 17 is a schematic explanatory view of the manufacturing method of the third embodiment.
In the first embodiment described above, as shown in FIG. 6, the CD direction tension applying step S60 is provided only on the downstream side in the transport direction with respect to the vent formation processing position P51 of the vent formation step S50. Although not provided on the side, in the third embodiment, as shown in FIG. 17, the main difference is that the process S60 is provided not only on the downstream side but also on the upstream side. The other points are substantially the same as those in the first embodiment described above. Therefore, the same reference numerals are given to the same configuration, and the description thereof will be omitted.

  As shown in FIG. 17, in the third embodiment, the position on the upstream side in the transport direction with respect to the vent formation processing position P51 of the vent forming step S50 is substantially the same as that described in the first embodiment. A configuration of the CD direction tensioning device 60 is arranged. That is, the apparatus 60 has the position adjusting mechanisms 60A and 60A having substantially the same configuration as those described above on both sides in the CD direction, and the sheet having no air holes h formed by the position adjusting mechanisms 60A and 60A. The tension in the CD direction is applied to the second member 30mf. And thereby, the vent hole h is formed in the sheet-like member 30 mf in the state to which the tension | tensile_strength of CD direction was provided in the vent hole formation process position P51 of vent hole formation process S50.

  Here, when forming the vent hole h in this manner, the forming accuracy of the vent hole h can be enhanced by applying a tension in the CD direction to the sheet-like member 30 mf. The details are as follows.

First, as described above, the sheet-like member 30mf has the thread rubber continuous bodies 35a and 45a, and when the sheet-like member 30mf is conveyed in the conveyance direction, it is used as a tension for conveyance. The sheet-like member 30mf is tensioned in the direction along the transport direction. Therefore, the sheet-like member 30mf can be contracted in width by an amount by which the sheet-like member 30mf is stretched in the conveyance direction by the tension for the conveyance. That is, it can contract in the CD direction. Then, based on the contraction, the fibers of the sheet member 30mf as a whole are shifted from the end side to the center side in the CD direction, and as a result, the sheet member 30mf has a density of fiber distribution (g / cm ³ ). Is biased with respect to the CD direction. For example, the density in the central part in the CD direction is higher than that in the end. Then, when the vent hole h is formed in the sheet member 30 mf in the improper state having such a sparse and dense state, the process of forming the vent hole h becomes unstable, and the formation accuracy of the vent hole h may be lowered. However, in this respect, according to the manufacturing method of the third embodiment, the vent hole h is formed in the sheet member 30mf in a state in which the tension in the CD direction is applied to the sheet member 30mf. Therefore, at the time of formation of the vent hole h, the sheet-like member 30mf is changed from the improper state in which the density of the fiber distribution is biased with respect to the CD direction to the proper state in which the density bias is reduced. The formation accuracy of the vent holes h can be enhanced.

=== 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, it goes without saying that the present invention can be modified or improved without departing from the gist thereof, and that the present invention includes equivalents thereof. For example, the following modifications are possible.

  In the above-mentioned embodiment, although the continuous bodies 35a and 45a of thread rubber were illustrated as an example of a continuous elastic member, it does not restrict to this at all. For example, it may be a continuous rubber band.

  In the embodiment described above, as shown in the enlarged view of the main part in FIG. 10, the pin member 55p of the intermediate roll 55 has the conical portion 55pa and the cylindrical portion 55pb, but it is not limited thereto. For example, the conical portion 55pa may be replaced by a pyramidal portion having a polygonal cross section such as a triangular pyramid or a quadrangular pyramid, or the cylindrical portion 55pb may be substituted to a columnar portion having a polygonal cross section such as a triangular prism or a quadrangular prism. You may

  In the above embodiment, as shown in FIG. 9, the sheet-like member 30mf as the intermediate product 1m is wound around the upstream roll 51 and the intermediate roll 55 of the vent forming device 50 in the vent forming step S50, It is not limited to this at all. That is, the sheet-like member 30mf may be passed between the respective rolls 51 and 55 without being wound on either of the upstream side roll 51 and the intermediate roll 55.

Although three-piece type disposable diaper 1 was illustrated as an example of an absorptive article in the above-mentioned embodiment, it does not restrict to this at all. For example, when manufacturing the sheet-like member used as a material of a 2-piece type disposable diaper, you may apply the manufacturing method and manufacturing apparatus of the sheet-like member of this invention. By the way, in the two-piece type disposable diaper, for example, an absorbent body having an outer covering sheet having a ventral side, a crotch and a back side as a first component, and fixed to the skin side of the outer covering sheet It is a diaper of the type which has as a 2nd part. And in that case, when the continuous sheet of the above-mentioned exterior sheet is formed by the nonwoven fabric of two sheets, and it forms a hole in the nonwoven fabric of the two sheets concerned, or cuts an elastic member between two nonwoven fabrics of two sheets. The method and apparatus for manufacturing a sheet-like member according to the present invention will be used.
Furthermore, the two-piece diaper may be a so-called tape-type disposable diaper. A tape-type disposable diaper is a type that uses a fastening tape to connect the ventral side covering the trunk of the wearer from the ventral side with the back side covering the trunk from the dorsal side. It is a diaper of.
Further, speaking further, the absorbent article is not limited to the disposable diaper 1 at all. That is, if it is an absorptive article manufactured by using a nonwoven fabric as a material, the manufacturing method and manufacturing device of a sheet-like member of the present invention are applicable at the time of the manufacture. Therefore, the concept of the absorbent article also includes a urine absorbing pad, a sanitary napkin and the like.

  In the above embodiment, as an example of the CD direction tension applying device 60 used in the CD direction tension applying step S60 of FIG. 6 and FIG. 16, each end 30mfe, 30mfe of the sheet member 30mf on both sides in the CD direction. Although the apparatus having two position adjusting mechanisms 60A and 60A for adjusting the position of the lens is illustrated, the present invention is not limited thereto. For example, as the device 60, the roll crown may use a minus crown (concave shape) roll, that is, a roll (not shown) whose diameter at the central part in the CD direction is smaller than the diameter at both ends in the CD direction. . And in that case, the same roll is supported rotatably around the rotation axis along the CD direction, and the sheet-like member 30mf is wound around the outer peripheral surface of the same roll. The sheet-like member 30mf is pulled to both sides in the CD direction based on the peripheral speed difference between the central portion and the both ends, whereby the sheet-like member 30mf is given tension in the CD direction. .

  In the above-described embodiment, the position of the vent hole forming step S50 is set on the upstream side in the transport direction with respect to each position of the slit step S70, the belly side thread rubber cutting step S80, and the back side thread rubber cutting step S90. Not limited to this. For example, the position of the vent hole forming step S50 may be set downstream of the position of the slit process S70 or the positions of the belly side thread rubber cutting step S80 and the back side thread rubber cutting step S90 in the transport direction. .

1 Disposable diapers (absorbent articles),
1a Diaper Continuum, 1Ha Diaphragm Diaper Continuum,
1m intermediate product,
10 Absorbent body,
10LG part, 10ea end, 10eb end,
11 absorber, 11c absorbent core,
13 top sheets, 15 back sheets,
15a leakproof sheet, 15b exterior sheet,
16 thread rubber,
30mf sheet-like member (composite sheet), 30mfe end,
30mf1 continuous nonwoven fabric (first nonwoven fabric), 30mf2 continuous nonwoven fabric (second nonwoven fabric),
30mf2p1 part, 30mf2p2 part,
31 ventral strap member, 31a continuum of ventral strap member,
31e end,
31s Absorbent body non-existent part,
32 non-woven, 32Le end,
33 non-woven fabric, 33B folded back,
35 thread rubber (elastic member), 35eu part,
35a rubber thread continuum (elastic member), 35aed end, 35aedn part,
41 back strap member, 41a back strap continuous member,
42 non-woven, 42Le end,
43 non-woven fabric, 43B folded back,
45 thread rubber (elastic member),
45a continuous thread rubber (elastic member),
50 vent hole formation device (through hole formation device),
51 upstream roll (second rotating body), 51h hole,
55 intermediate roll (first rotating body),
55p pin member (pushing member), 55pa cone, 55pb cylinder,
55r receiving part, 55rt top surface,
58 downstream roll, 58h hole,
60 CD direction tensioning device, 60A position adjustment mechanism,
60Ru nip roller, 60Rd nip roller,
60d actuator, 60s sensor,
70 slitting device,
80 ventral cutter device,
81u cutter roll, 81ua outer surface,
81d anvil roll, 81da outer peripheral surface,
84 cutter block,
90 back side cutter device,
h vent (through hole), he edge, C cutter blade, B burr,
AH stretchable area, AH1 fixed area,
AL non-stretching area, AL1 non-fixed area,
AU upper region, AD lower region, ADc central region, ADe end region,
BH waist opening, LH leg opening, LG leg gather,
CL1 center position, CL10 predetermined position, CL center line, C60A support shaft,
SS side seal,
PC position, TC trace, BL boundary position,
Gh31 vents, Rh31 vent row,
Gh41 vents, Rh41 vent row,
G51h1 hole group, G51h2 hole group,
G55p1 pin members, G55p2 pin members,
G58h1 hole group, G58h2 hole group,
SG51h1 hole group set, SG51h2 hole group set,
SG55p1 pin member group set, SG55p2 pin member group set,
R51 first transport route, R55 second transport route, R58 third transport route,
P51 closest position (vent formation position, through hole formation position), P55 closest position,
P60 pinching position (tension application position),
S50 vent formation step (through hole formation step),
S60 CD direction tensioning process,
S70 slitting process (processing process),
S75 interval formation process (processing process),
S80 belly rubber cutting process (processing process),
S90 back side thread rubber cutting process (processing process),
S100 Absorbent main body attachment process (separate member fixing process, processing process),
S110 double folding process (processing process),
S120 Side seal process (processing process),
S130 cutting process (processing process),

Claims (8)

A method for manufacturing a sheet-like member in which a plurality of through holes are formed from a composite sheet continuous in a predetermined direction,
The first non-woven fabric continuous in the predetermined direction and the second non-woven fabric continuous in the predetermined direction while being overlapped with the first non-woven fabric in the thickness direction of the composite sheet A conveying step of conveying the composite sheet in which the plurality of elastic members along the predetermined direction are interposed and fixed in a state of being arranged in the CD direction intersecting the predetermined direction, with the predetermined direction as the conveyance direction;
A through hole is formed in the composite sheet to form the through hole penetrating in the thickness direction by pushing a pushing member in the thickness direction to a position between the elastic members adjacent in the CD direction in the composite sheet. Forming process,
A CD direction tension applying step of applying tension in the CD direction to the composite sheet at a position downstream of the through hole formation processing position where the through hole is formed in the through hole forming step;
And a processing step of processing the composite sheet at a position downstream of the tension application position where the tension is applied in the CD direction tension application step, in the transport direction. Method of manufacturing a sheet-like member It is a manufacturing method of the sheet-like member concerning the absorptive article according to claim 1,
A plurality of the processing steps are provided downstream of the through hole formation processing position in the transport direction,
The tension applying position in the CD direction tension applying step is located between the through hole forming processing position and the position of the processing step closest to the through hole forming processing position among the plurality of processing steps. The manufacturing method of the sheet-like member which concerns on the absorbent article characterized by the above-mentioned. It is a manufacturing method of the sheet-like member concerning the absorptive article according to claim 1 or 2,
The absorbent article according to the absorbent article characterized in that there is no separate member fixing step for fixing a separate member to the composite sheet at a position upstream of the tension applying position in the CD direction tension applying step in the transport direction. Method of manufacturing a sheet-like member It is a manufacturing method of the sheet-like member which concerns on the absorbent article in any one of Claim 1 thru | or 3, Comprising:
The first non-woven fabric and the second non-woven fabric both include thermoplastic resin fibers,
In the through hole forming step, the pushing member protrudingly formed on the outer peripheral surface of the first rotating body, which rotates along the conveying direction, rotates the outer peripheral surface of the second rotating body, which rotates along the conveying direction. When inserted into the hole, the push-in member is pushed into the composite sheet to form the through hole,
The rotating body of at least one of the first rotating body and the second rotating body is heated, and the composite sheet is heated by the rotating body,
In the CD direction tension applying step, the composite sheet is applied with the tension in the CD direction at a temperature higher than the temperature of the composite sheet before being heated by the rotating body. The manufacturing method of the sheet-like member which concerns. It is a manufacturing method of the sheet-like member which concerns on the absorbent article in any one of Claim 1 thru | or 4, Comprising:
A sheet-like member according to an absorbent article, wherein the dimension in the CD direction of the composite sheet at the tension application position is equal to or larger than the dimension in the CD direction of the composite sheet at the through hole formation processing position. Manufacturing method. A method of manufacturing a sheet-like member according to any one of claims 1 to 5, which is the absorbent article,
The tension in the CD direction is applied in the CD direction tension application step such that the dimension in the CD direction of the through hole at the tension application position is larger than the dimension of the pushing member in the CD direction. The manufacturing method of the sheet-like member which concerns on the absorbent article characterized by doing. A method of manufacturing a sheet-like member according to any one of claims 1 to 6, which is the absorbent article,
It additionally has a CD direction tension application step of applying tension to the composite sheet in the CD direction on the upstream side of the transport direction from the through hole formation processing position,
In the through hole forming step, the through hole is formed in the composite sheet in a state where the tension in the CD direction is applied, and the method for manufacturing a sheet-like member according to an absorbent article. An apparatus for manufacturing a sheet-like member having a plurality of through holes formed from a composite sheet continuous in a predetermined direction, comprising:
The first non-woven fabric continuous in the predetermined direction and the second non-woven fabric continuous in the predetermined direction while being overlapped with the first non-woven fabric in the thickness direction of the composite sheet A conveying device for conveying the composite sheet, in which the plurality of elastic members along the predetermined direction are interposed and fixed in a state in which the plurality of elastic members are arranged in the CD direction intersecting the predetermined direction, the conveyance direction being the predetermined direction;
A through hole is formed in the composite sheet to form the through hole penetrating in the thickness direction by pushing a pushing member in the thickness direction to a position between the elastic members adjacent in the CD direction in the composite sheet. Forming device,
CD direction tension applying device that applies tension in the CD direction to the composite sheet at a position downstream of the through hole forming processing position at which the through hole forming device forms the through hole in the composite sheet in the transport direction When,
And a processing device for processing the composite sheet at a position downstream of the tension application position where the CD direction tension applying device applies the tension in the CD direction to the composite sheet. The manufacturing apparatus of the sheet-like member which concerns on the absorbent article characterized by the above-mentioned.

Images