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WO2016063346A1 - Procédé et dispositif de fabrication d'un élément de type feuille pour article absorbant - Google Patents

Procédé et dispositif de fabrication d'un élément de type feuille pour article absorbant Download PDF

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Publication number
WO2016063346A1
WO2016063346A1 PCT/JP2014/077944 JP2014077944W WO2016063346A1 WO 2016063346 A1 WO2016063346 A1 WO 2016063346A1 JP 2014077944 W JP2014077944 W JP 2014077944W WO 2016063346 A1 WO2016063346 A1 WO 2016063346A1
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WO
WIPO (PCT)
Prior art keywords
sheet
cutter
continuous
region
elastic member
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2014/077944
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English (en)
Japanese (ja)
Inventor
知行 嵯峨
行功 赤野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Unicharm Corp
Original Assignee
Unicharm Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Unicharm Corp filed Critical Unicharm Corp
Priority to PCT/JP2014/077944 priority Critical patent/WO2016063346A1/fr
Priority to JP2015507836A priority patent/JP5789730B1/ja
Publication of WO2016063346A1 publication Critical patent/WO2016063346A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/49—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape specially adapted to be worn around the waist, e.g. diapers, nappies

Definitions

  • the present invention relates to a method for manufacturing a sheet-like member and an apparatus for manufacturing absorbent articles such as disposable diapers.
  • a high stretch region and a low stretch region that is less stretchable in a predetermined direction than the high stretch region are arranged in a predetermined direction.
  • the sheet-like member which it has is used.
  • FIG. 1 is a schematic view showing the generation process in a plan view of the sheet-like member 20s ′. *
  • a composite sheet 20s1 'as a material of the sheet-like member 20s' is conveyed in the MD direction.
  • the composite sheet 20s1 ′ is made of rubber thread as an elastic member continuous in the MD direction between the first continuous sheet 21s ′ continuous in the MD direction and the second continuous sheet 22s ′ continuous in the MD direction.
  • the continuous bodies 27s ′, 27s ′,... Are inserted in the MD direction in an expanded state.
  • the continuous bodies 27s ', 27s', ... of the rubber thread are fixed to the continuous sheets 21s ', 22s' intermittently in the MD direction. That is, the continuums 27s ′, 27s ′... Of the same thread rubber are fixed with a hot melt adhesive in the region AH1 ′ corresponding to the high stretch region AH ′, but the low stretch region AL ′. Is not fixed in the area AL1 ′ corresponding to. *
  • a low expansion / contraction region in the composite sheet 20s1 ′ is formed by a cutter blade (not shown) and an anvil roll (not shown) of the cutter roll of the device 50 ′.
  • the region AL1 ′ corresponding to AL ′ is clamped, and thereby the rubber thread continuums 27s ′, 27s ′,... Are cut at a single PC in the MD direction.
  • the cut rubber threads 27sd ′, 27sd ′ ... Shrink toward the regions AH1 ′, AH1 ′ corresponding to the high stretch regions AH ′, AH ′, respectively.
  • the stretchable area AH ′ and the low stretchable area AL ′ are formed side by side in the MD direction. With the above, the sheet-like member 20s' is generated.
  • the two continuous sheets 21s ′ and 22s ′ are not cut as much as possible.
  • the first continuous sheet 21s ′ and the second continuous sheet 21 are located at the sandwiched position PC1.
  • a crimping portion j with the sheet 22s ′ is formed.
  • Patent Document 1 does not disclose the formation of the crimping portion j at the same position PC1, and therefore, of course, a specific method for reliably forming the crimping portion j is not disclosed at all. Not.
  • the present invention has been made in view of the conventional problems as described above, and its object is to position the first continuous sheet and the second continuous sheet at a position where an elastic member such as a continuous thread rubber is cut in the composite sheet.
  • the purpose is to surely form a pressure-bonding portion with the continuous sheet to suppress damage to the sheet-like member.
  • the main invention for achieving the above object is: A method for producing a sheet-like member having a high stretch region and a low stretch region having lower stretchability in a predetermined direction than the high stretch region, arranged in the predetermined direction, Between the first continuous sheet that continues in the predetermined direction and the second continuous sheet that continues in the predetermined direction, an elastic member that extends in the predetermined direction and is inserted in the predetermined direction is inserted, at least Conveying the composite sheet fixed in the region corresponding to the high expansion / contraction region with the predetermined direction as the conveyance direction; By cutting the elastic member at one place in the transport direction in the region corresponding to the low expansion / contraction region, and contracting the elastic member toward the region corresponding to the high expansion / contraction region, the composite sheet Forming a high stretch region and the low stretch region side by side in the transport direction, In the forming, when the composite sheet passes along the transport direction between the cutter rotating body and the anvil rotating body that rotate to face each other, the outer periphery of the cutter rotating body.
  • the surface cutter blade and the anvil rotator sandwich the composite sheet in a state where there is a gap between them, so that the first continuous sheet and the first A method for producing a sheet-like member according to an absorbent article, wherein the elastic member is cut while forming a crimping portion with two continuous sheets.
  • the elastic member is formed while the pressure-bonding portion between the first continuous sheet and the second continuous sheet is formed at the position where the composite sheet is clamped by clamping the composite sheet with a gap in between. It is the manufacturing apparatus of the sheet-like member which concerns on the absorbent article characterized by cutting
  • the present invention it is possible to reliably form the pressure-bonding portion between the first continuous sheet and the second continuous sheet at the position where the elastic member such as the thread rubber continuous body is cut in the composite sheet. Damage to the sheet-like member can be suppressed.
  • FIG. 6 is a schematic plan view showing a process of generating a sheet-like member 20s ′ having a high stretch region AH ′ and a low stretch region AL ′.
  • 1 is a schematic perspective view of a three-piece disposable diaper 1 as an example of an absorbent article according to the present embodiment. It is the schematic plan view which looked at the diaper 1 of the unfolding state from the skin side. It is the schematic plan view which looked at the same diaper 1 from the non-skin side.
  • 5A is a cross-sectional view taken along line AA in FIG. 3
  • FIG. 5B is a cross-sectional view taken along line BB in FIG.
  • FIG. 6 is a sectional view taken along line VI-VI in FIG. 3.
  • FIG. 9A is a schematic plan view of the sheet-like member 20asb immediately before being conveyed to the manufacturing apparatus 30 of the present embodiment, and FIG. 9B illustrates that the expansion areas AH and AH and the non-expandable area AL are formed by the manufacturing apparatus 30. It is a schematic plan view of the formed sheet-like member 20as.
  • FIG. 10A is a schematic side view of the manufacturing apparatus 30, and FIG. 10B is a BB arrow view in FIG. 10A.
  • FIG. It is a schematic side view which shows a mode that the sheet-like member 20asb which can be processed similarly is processed with the manufacturing apparatus 30.
  • FIG. It is a schematic plan view of an arrangement pattern in which one cutter blade C is associated with a continuous body 27s of two or three thread rubbers.
  • the surface cutter blade and the anvil rotator sandwich the composite sheet in a state where there is a gap between them, so that the first continuous sheet and the first A method for producing a sheet-like member according to an absorbent article, wherein the elastic member is cut while forming a crimping portion with two continuous sheets.
  • the cutter blade and the anvil rotator sandwich the composite sheet in a state where there is a gap between the cutter blade and the anvil rotator.
  • the gap functions as a space for forming a pressure-bonding portion between the first continuous sheet and the second continuous sheet when the elastic member is cut by the cutter blade. Therefore, the crimping part can be reliably formed.
  • it is possible to effectively avoid the first continuous sheet and the second continuous sheet from being partially cut and penetrating in the thickness direction with the cutting of the elastic member. As a result, it is possible to suppress damage to the finally generated sheet-like member.
  • a method for producing a sheet-like member according to such an absorbent article When the direction intersecting the transport direction is the CD direction, The film member that the composite sheet has between the second continuous sheet and the elastic member is disposed across the both directions of the transport direction and the CD direction at a position where the composite sheet is clamped by the cutter blade.
  • the cutter blade is preferably in contact with the composite sheet from the first continuous sheet side to cut the elastic member.
  • the film member serves as an underlay or chopping board that supports the elastic member from the opposite side of the cutter blade.
  • the elastic member can be supported so as not to move in the clamping direction. Therefore, it is possible to effectively prevent the elastic member from sinking in the pinching direction, which can occur during cutting, and as a result, the elastic member can be cut with high cutting performance.
  • a method for producing a sheet-like member according to such an absorbent article The basis weight of the first continuous sheet is smaller than the basis weight of the second continuous sheet,
  • the cutter blade is preferably in contact with the composite sheet from the first continuous sheet side to cut the elastic member.
  • the second continuous sheet having a larger basis weight is arranged so that the elastic member is removed from the opposite side of the cutter blade. Functions as an underlaying or cutting board to support. That is, the second continuous sheet can support the elastic member so as not to move in the clamping direction with high rigidity due to the large basis weight. As a result, it is possible to effectively prevent the elastic member from sinking in the pinching direction, which can occur during cutting, and as a result, the elastic member can be cut with high cutting performance.
  • a method for producing a sheet-like member according to such an absorbent article is preferably inclined with respect to the direction along the rotation axis of the cutter rotating body.
  • the cutting edge of the cutter blade is inclined with respect to the direction along the rotation direction of the cutter rotating body. Therefore, as compared with the case where the blade edge is parallel to the direction along the rotation axis direction, the cutting time of the elastic member can be ensured longer by the amount of inclination. And thereby, an elastic member can be cut
  • the composite sheet has a plurality of the elastic members arranged in the CD direction intersecting the transport direction, A plurality of the cutter blades are arranged at positions shifted from each other in the CD direction on the outer peripheral surface of the cutter rotating body in correspondence with the plurality of elastic members, and the plurality of the cutter blades Among the plurality of cutter blades, after one elastic blade is cut by one of the cutter blades and the one cutter blade is still pressing the composite sheet with the anvil rotating body. The other cutter blade for cutting the other elastic member next is already in a state of sandwiching the composite sheet with the anvil rotator, It is desirable that at least one cutter blade is located at a position between the one cutter blade and the other cutter blade in the CD direction.
  • vibration that can occur in the cutter rotating body when the elastic member is cut can be suppressed.
  • the reason which can suppress a vibration is as follows, for example. *
  • At least one cutter blade is located between the one cutter blade and the other cutter blade in the CD direction, so that the cutter blades that are in the two-point support state are placed in the CD direction. Can be separated greatly. That is, the support span of two-point support can be increased. This can effectively contribute to the stabilization of the two-point support state, and as a result, the vibration of the cutter rotating body can be more reliably suppressed.
  • a method for producing a sheet-like member according to such an absorbent article It is desirable that the number of the cutter blades that simultaneously clamp the composite sheet with the anvil rotating body over all the cutter blades of the plurality of cutter blades is 2 or less.
  • the number of cutter blades that simultaneously clamp the composite sheet with the anvil rotating body is set to 2 or less. Therefore, it is possible to effectively prevent the pinching force applied to the cutter blade from being dispersed and reduced in a large number of cutter blades, and as a result, each elastic member can be reliably cut.
  • the cutting edge of the cutter blade has an extending direction in which the cutting edge extends, and a blade width direction orthogonal to the extending direction,
  • the dimension in the blade width direction is preferably 0.1 mm to 1 mm.
  • the dimension in the blade width direction is 1 mm or less, while the elastic member can be reliably cut, the same dimension is 0.1 mm. Based on the above, it is possible to effectively prevent the first continuous sheet and the second continuous sheet from being completely cut and to reliably form a crimping portion between these continuous sheets.
  • the cutter rotator is a cutter roll that rotates around a rotation axis along a CD direction intersecting the transport direction
  • the anvil rotator is an anvil roll that rotates around a rotation axis along the CD direction; At least one of the cutter roll and the anvil roll has an annular protrusion protruding in an annular shape from the outer peripheral surface of the roll over the entire circumference in the rotation direction of the roll, In the state where the outer peripheral surface of the annular protrusion is in contact with the anvil roll, it is desirable that the gap be formed between the cutter blade and the anvil roll.
  • the manufacturing method of the sheet-like member related to such an absorbent article in the state where the cutter rotating body and the anvil rotating body sandwich the composite sheet via the cutter blade, the annular protrusion and the anvil roll described above.
  • the size of the gap is maintained at a substantially constant value.
  • various other gaps that can affect the gap for example, a gap that is included in a bearing member for forming a rotating shaft of a cutter rotating body or an anvil rotating body may be reduced.
  • the size of the gap between the cutter blade and the anvil roll can be maintained at a substantially constant value with high accuracy.
  • a method for producing a sheet-like member according to such an absorbent article The fineness of the elastic member is 400 dtex to 1000 dtex, The size of the gap is preferably 1 ⁇ m to 20 ⁇ m.
  • the sheet-shaped member is 400 dtex to 1000 dtex.
  • the elastic member having a fineness can be reliably cut.
  • the elastic member is formed while the pressure-bonding portion between the first continuous sheet and the second continuous sheet is formed at the position where the composite sheet is clamped by clamping the composite sheet with a gap in between. It is the manufacturing apparatus of the sheet-like member which concerns on the absorbent article characterized by cutting
  • FIG. 2 is a schematic perspective view of a three-piece type disposable diaper 1 as an example of the disposable diaper 1.
  • FIG. 3 is a schematic plan view of the unfolded diaper 1 as seen from the skin side
  • FIG. 4 is a schematic plan view of the diaper 1 as seen from the non-skin side.
  • 5A is a sectional view taken along line AA in FIG. 3
  • FIG. 5B is a sectional view taken along line BB in FIG. 3
  • FIG. 6 is a sectional view taken along line VI-VI in FIG.
  • the diaper 1 has a vertical direction, a horizontal direction, and a thickness direction as three directions orthogonal to each other. Moreover, since the diaper 1 is what is called a three-piece type, it has the absorptive main body 10 which is applied to a wearer's crotch part and absorbs excrement, such as urine, as a 1st component, And it has the ventral side belt member 20a which covers the wearer's torso from the abdomen side, and has the back side band member 20b which covers the wearer's torso from the back side as the third part.
  • the absorptive main body 10 which is applied to a wearer's crotch part and absorbs excrement, such as urine, as a 1st component
  • the ventral side belt member 20a which covers the wearer's torso from the abdomen side
  • the back side band member 20b which covers the wearer's torso from the back side as the third part.
  • the abdominal band member 20a and the dorsal band member 20b are arranged in parallel with a space between each other, while the absorbent main body 10 is stretched between them.
  • End portions 10ea and 10eb in the longitudinal direction of the absorbent main body 10 are bonded and fixed to the nearest belt members 20a and 20b, respectively, and the external shape is substantially H-shaped in plan view.
  • the diaper 1 is folded in two with the substantially central portion CL10 in the longitudinal direction of the absorbent main body 10 as the folding position, and the belt members 20a, 20b facing each other in the folded state are worn by the wearer.
  • a pants-type diaper 1 in which a waist opening 1HB and a pair of leg openings 1HL, 1HL are formed as shown in FIG.
  • the absorbent main body 10 absorbs the absorbent core 11, the liquid-permeable surface sheet 13 that covers the core 11 from the skin side and forms the skin side surface of the absorbent main body 10, and the core 11 from the non-skin side.
  • the absorbent core 11 is formed by molding a liquid absorbent material such as pulp fiber or a super absorbent polymer as an example of a liquid absorbent fiber into a predetermined shape such as a substantially hourglass shape in plan view.
  • the core 11 is covered with a liquid-permeable covering sheet 12, and the back sheet 15 has a two-layer structure having a nonwoven fabric 15nw and a resin film 15f. Not limited to this.
  • the absorptive main body 10 may have the solid gathers LSG and LSG as a leak-proof wall part in each edge part of a horizontal direction in order to prevent a side leak.
  • elastic members 17r such as rubber thread are arranged on both sides of the absorbent main body 10 in the lateral direction, so that it corresponds to the leg openings 1HL and 1HL of the diaper 1 as shown in FIG.
  • Stretchable leg gathers LG, LG may be formed on the portion to be stretched.
  • the abdominal band member 20a and the dorsal band member 20b are respectively sheet-like members having a substantially rectangular shape in plan view that are long in the lateral direction, and as shown in FIGS. It has an outer layer sheet 21 and an inner layer sheet 22 laminated in the thickness direction.
  • the inner layer sheet 22 is located on the skin side in the thickness direction with respect to the outer layer sheet 21.
  • both the sheets 21 and 22 are formed with flexible sheets, such as a nonwoven fabric, and the spun bond nonwoven fabric is used in this example.
  • the present invention is not limited to this, and another type of non-woven fabric may be used, or a resin film or woven fabric may be used.
  • a single fiber of polypropylene (PP) is used as a constituent fiber of the nonwoven fabric.
  • PP polypropylene
  • the present invention is not limited to this, and a single fiber of other thermoplastic resin such as polyethylene (PE) may be used.
  • PE polyethylene
  • a composite fiber such as a sheath core structure of PE and PP may be used.
  • central regions 20ac and 20bc in the lateral direction of the band members 20a and 20b are overlapped and joined to the non-skin side surfaces of the longitudinal ends 10ea and 10eb of the absorbent main body 10.
  • the planar size of the outer layer sheet 21 is a size that protrudes outward in the vertical direction from the inner layer sheet 22, and the protruding portion of the outer layer sheet 21. 21p is folded inward in the longitudinal direction to cover the longitudinal end portion 22e of the inner layer sheet 22, but is not limited thereto.
  • the belt members 20a and 20b are provided with lateral stretchability so that the belt members 20a and 20b can hold the wearer's torso firmly when the diaper 1 is worn.
  • the band members 20a and 20b In particular, in the regions 20ac and 20bc overlapping the absorbent core 11 of the absorbent main body 10, a non-stretchable region AL having almost no stretchability is formed.
  • ventral belt member 20a As shown in the schematic plan view of FIG. 7, the ventral belt member 20a will be described below by dividing it into two regions AU and AD in the vertical direction. That is, the area AU located on the waistline opening 1HB side in the vertical direction is referred to as “upper area AU”, and the area AD located on the leg circumference opening 1HB side is referred to as “lower area AD”.
  • the absorbent core 11 of the absorbent main body 10 does not overlap the upper region AU. Therefore, the region AU is given stretchability over the entire length in the lateral direction.
  • the provision of stretchability is realized by a plurality of thread rubbers 25, 25... Arranged in the horizontal direction in a laterally stretched state and fixed in the same region AU in the vertical direction.
  • the thread rubber 25 is fixed to the area AU by, for example, the thread rubber 25 or a hot melt adhesive applied to the area AU.
  • examples of the fineness of the thread rubber 25 include 400 dtex to 1000 dtex, and specific examples of the thread rubber 25 include LYCRA (trademark). This also applies to the rubber thread 27 provided in the lower region AD described later.
  • the central region ADc has a non-stretchable region AL that has almost no lateral stretchability. (Corresponding to a low expansion / contraction region) is formed, and since the absorbent core 11 does not substantially overlap the end side regions ADe, ADe located on both sides of the central region ADc, the end side region ADe , ADe are formed with stretchable areas AH, AH (corresponding to high stretchable areas) having higher stretchability than the non-stretchable area AL.
  • the non-stretchable region AL of the central region ADc and the stretchable regions AH, AH of the end regions ADe, ADe are formed as follows. First, as shown in FIG. 8, between the outer layer sheet 21 and the inner layer sheet 22, a plurality of thread rubbers 27s, 27s,... ing. Each thread rubber 27s is generally fixed with a hot melt adhesive in the region AH1 corresponding to the stretchable region AH in the end side region ADe, but in the region AL1 corresponding to the non-stretchable region AL in the central region ADc, Generally not fixed.
  • the band member 20a is clamped from both sides in the thickness direction by a cutter device 50, which will be described later, whereby the thread rubbers 27s, 27s.
  • the cut rubber threads 27, 27... Shrink toward the end in the lateral direction, and generally do not stay in the region AL1 corresponding to the non-stretchable region AL in the central region ADc, but expand and contract in the end side region ADe.
  • the region AH1 corresponding to the region AH remains approximately, and as a result, the non-stretchable region AL is formed in the central region ADc, and the stretchable region AH is formed in the end side region ADe.
  • a linear crimping portion j is formed at each position PC1 that is clamped from both sides in the thickness direction of the abdominal band member 20a when cutting the rubber threads 27s, 27s. This will be described later.
  • FIG. 9A is a schematic plan view for explaining the sheet-like member 20asb immediately before being conveyed to the manufacturing apparatus 30.
  • the sheet-like member 20asb is in a state where a plurality of ventral belt members 20a, 20a,.
  • the sheet-like member 20asb includes a plurality of continuous thread rubbers 25s between a continuous sheet 21s (corresponding to the first continuous sheet) of the outer layer sheet and a continuous sheet 22s (corresponding to the second continuous sheet) of the inner layer sheet.
  • a plurality of thread rubber continuous bodies 27 s, 27 s... Are in a state of a composite sheet 20 asb in which both continuous sheets 21 s, 22 s are joined.
  • the sheet-like member 20asb is arranged along the width direction along the way.
  • region of the width direction in the sheet-like member 20asb is equivalent to the upper area
  • region of the other side is equivalent to the lower area
  • the stretchable area AH and the non-stretchable area AL are formed side by side in the continuous direction, a plurality of corresponding thread rubber continuous bodies 27s, 27s.
  • the continuous sheets 21s and 22s according to 20asb are intermittently fixed with a hot melt adhesive in a continuous direction. That is, in the continuous sheet 21s, 22s in FIG. 9A, in the region AH1 corresponding to the stretchable region AH, the thread rubber continuous bodies 27s, 27s... Are fixed by the hot melt adhesive, but correspond to the non-stretchable region AL. In the area AL1, it is not fixed. At this time, as shown in FIG.
  • the area AH1 corresponding to the stretchable area AH and the area AL1 corresponding to the non-stretchable area AL are in a continuous direction at a ratio of 2 to 1. This is because the stretchable regions AH and AH exist on both sides in the lateral direction of the non-stretchable region AL in the single-cut ventral belt member 20a shown in FIG. However, here, it is not necessary to distinguish and explain the areas AH1 and AH1 corresponding to the two stretchable areas AH and AH adjacent to each other in FIG. 9A. Therefore, in the following, these two areas AH1 and AH1 are combined. This will be described as one area AH2. In this case, as shown in FIG.
  • the continuous direction of the sheet-like member 20asb is also referred to as “MD direction”, and the width direction of the sheet-like member 20asb is also referred to as “CD direction”.
  • the thickness direction of the sheet-like member 20asb, the MD direction as the continuous direction, and the CD direction as the width direction are orthogonal to each other.
  • FIG. 10A is a schematic side view of the manufacturing apparatus 30, and FIG. 10B is a BB arrow view in FIG. 10A. *
  • the manufacturing apparatus 30 includes a transport device 40 that transports the sheet-like member 20asb having continuous thread rubbers 27s, 27s... With the MD direction as the transport direction, and the sheet-like member 20asb. And a cutter device 50 for cutting the thread rubber continuum 27s, 27s (corresponding to an elastic member).
  • the transport device 40 has, for example, a plurality of transport rollers 40R, 40R,. And at least one of the plurality of transport rollers 40R, 40R ... is a drive roller that rotates around a rotation axis along the CD direction, and the transport roller 40R other than the drive roller is, for example, a sheet-like member This is a driven roller that rotates with 20 asb. In addition, it may replace with this conveyance roller 40R, or in addition to the roller 40R, the conveyance apparatus 40 may have a belt conveyor.
  • the cutter device 50 is the same when cutting a pair of upper and lower rolls 51u, 51d rotating around a rotation axis along the CD direction, and a continuous body of thread rubber 27s, 27s... With the outer peripheral surfaces 51ua, 51da facing each other. And a housing 55 for receiving a reaction force of cutting acting on the rolls 51u and 51d.
  • the pair of upper and lower rolls 51u and 51d are supported by bearing members 52u and 52d provided in the housing 55, respectively, so that they can rotate around a rotation axis parallel to the CD direction.
  • the bearing member 52d of the lower roll 51d is fixed to the housing 55 so as not to move.
  • the bearing member 52u of the upper roll 51u is fixed by an appropriate actuator 53 such as a hydraulic cylinder or an air cylinder fixed to the housing 55. It can be moved up and down in the up and down direction, which is the contact and separation direction with respect to the lower roll 51d.
  • the actuator 53 By controlling the actuator 53, the size of the gap between the outer peripheral surfaces 51ua and 51da of the pair of upper and lower rolls 51u and 51d and the size of the pressure contact force (N) as the force in the contact / separation direction can be adjusted. It has become.
  • each roll 51u, 51d is driven and rotated around the rotation axis by a servo motor (not shown) as a drive source. That is, the rotation is performed with the directions orthogonal to the rotation axis as the rotation directions Dc51u and Dc51d. Therefore, the sheet-like member 20asb fed between the outer peripheral surfaces 51ua and 51da of the pair of upper and lower rolls 51u and 51d passes between the outer peripheral surfaces 51ua and 51da and is sent downstream in the MD direction.
  • the lower roll 51d is a cutter roll (corresponding to a cutter rotating body), and the upper roll 51u is an anvil roll (corresponding to an anvil rotating body). That is, at least one cutter block 54 is provided on the outer peripheral surface 51da of the lower roll 51d at every angle corresponding to the product pitch of the diaper 1 in the rotation direction Dc51d. Specifically, in this example, as indicated by hatching in FIG. 10A, two cutter blocks 54 and 54 are provided at an angle of 180 ° in the rotation direction Dc51d. Further, each cutter block 54 is formed with a plurality of cutter blades C, C..., And the outer peripheral surface 51 ua of the upper roll 51 u which is an anvil roll is smooth so as to receive the cutter blades C, C.
  • the rolls 51u and 51d are controlled to rotate in conjunction with the conveying operation of the sheet-like member 20asb, so that each time the area AL1 corresponding to the non-expandable area AL passes, The cutter roll 51d rotates so that the cutter block 54 faces the surface.
  • the area AL1 is the cutter block 54 of the cutter roll 51d.
  • the cutter blades C, C... And the anvil roll 51u are clamped.
  • the thread rubber continuums 27s, 27s,... Are cut at the clamped positions PC1, respectively, so that the cut rubber thread 27 corresponds to the high expansion / contraction region AH as shown in FIG. 9B.
  • the region AH1 contracts, and as a result, a non-stretchable region AL and a stretchable region AH are formed in the sheet-like member 20asb.
  • FIG. 11 is an explanatory diagram of an arrangement state of the cutter blades C, C... Provided on the cutter block 54 of the cutter roll 51d, and is a view showing the outer peripheral surface 51da of the roll 51d developed on a plane.
  • continuous thread rubbers 27s, 27s,... are also virtually shown.
  • ruled lines parallel to the CD direction are also shown by two-dot chain lines.
  • ruled lines parallel to the rotation direction Dc51d (or MD direction) are also shown with two-dot chain lines. This also applies to FIGS. 13 and 16 which will be described later.
  • the cutter block 54 is provided with a plurality of cutter blades C, C...
  • the length LC in the extending direction of the blade edge is selected from a range of 4 mm to 30 mm, for example, and the dimension WC in the blade width direction orthogonal to the extending direction is selected from a range of 0.1 mm to 1 mm, for example.
  • the shape of the cutting edge is not limited to the linear shape as described above, and may be a zigzag broken line shape or a curved shape such as an arc line shape.
  • each cutter blade C, C... Is provided in association with each of the rubber thread continuous bodies 27 s, 27 s. Therefore, the continuous bodies 27s, 27s... Of each rubber thread can be reliably cut at one place PC1 in the MD direction.
  • the cutter device 50 has side rings 51SR and 51SR at each end of the cutter roll 51d in the CD direction.
  • Each side ring 51SR, 51SR is an annular protrusion that protrudes in an annular shape from the outer peripheral surface 51da of the cutter roll 51d over the entire circumference in the rotational direction Dc51d.
  • the cutting edge of the cutter blade C and the outer peripheral surface of the anvil roll 51u A gap G is formed with 51 ua.
  • the size of the gap G is set to, for example, 1 ⁇ m to 20 ⁇ m, desirably 5 ⁇ m to 15 ⁇ m, and in this example, 10 ⁇ m.
  • the sheet-like member 20asb passes the cutter device 50, the cutter blade C of the cutter roll 51d and the outer peripheral surface 51ua of the anvil roll 51u form a gap G between each other.
  • the sheet-like member 20asb is clamped, and when this is done, when the thread rubber continuous bodies 27s, 27s... Are cut at the pinched position PC1 in the sheet-like member 20asb, the same position PC1.
  • the crimping portion j between the continuous sheet 21s of the outer layer sheet and the continuous sheet 22s of the inner layer sheet can be quickly formed.
  • the crimping part j can be formed in a substantially film shape with a thickness of 10 ⁇ m, for example. As a result, it is effective that the continuous sheets 21s and 22s are partially cut and penetrated in the thickness direction at the clamped position PC1 with the cutting of the thread rubber continuous body 27s. As a result, damage to the continuum 20as of the ventral belt member 20a, which is the sheet-like member 20as that is finally generated, can be suppressed.
  • the state in which the side rings 51SR and 51SR are in contact with the anvil roll 51u is realized by the above-described actuator 53 such as a hydraulic cylinder exerting a vertical pressing force on both the cutter roll 51d and the anvil roll 51u.
  • the size of the gap G is maintained at a substantially constant value even when the sheet-like member 20asb is clamped by the cutter blade C and the anvil roll 51u. can do.
  • various other gaps that can affect the gap G such as gaps (not shown, outer races or inner races and rolling elements) that the bearing members 52d and 52u of the cutter roll 51d and the anvil roll 51u have inside.
  • the clearance between the two is reduced based on the pressure contact force of the actuator 53 like so-called “backlash”. This also can effectively contribute to maintaining the size of the gap G at a constant value.
  • the side ring 51SR is provided on the cutter roll 51d, but it is not limited to this. That is, instead of the cutter roll 51d or in addition to the cutter roll 51d, the anvil roll 51u may be provided.
  • the sheet-like member 20asb is arranged so that the continuous sheet 21s of the outer layer sheet faces the cutter roll 51d and the continuous sheet 22s of the inner layer sheet faces the anvil roll 51u. Yes.
  • the basis weight of the continuous sheet 22s of the inner layer sheet is made larger than the basis weight of the continuous sheet 21s of the outer layer sheet.
  • the basis weight of the former sheet 21s is 10 to 25 (g / m 2 )
  • the basis weight of the latter sheet 22s is 15 to 40 (g / m 2 ).
  • the cutter blade C abuts on the continuous sheet 22s of the outer layer sheet having a low basis weight and is sequentially pushed toward the continuous body 27s of the thread rubber and the continuous sheet 22s of the inner layer sheet. Therefore, at the time of cutting the thread rubber continuous body 27s, the inner sheet continuous body 22s has a high rigidity due to its high basis weight, and the thread rubber continuous body 27s is reverse to the cutter blade C as if it were an underlay or a cutting board. Support effectively from the side. This effectively prevents the thread rubber continuous body 27s from sinking in the thickness direction (moving upward in the example of FIG. 10A) and the like. The continuous body 27s can be cut.
  • the cutter roll 51d when cutting the thread rubber continuous body 27s, the cutter roll 51d may vibrate. However, if the vibration is large, the thread rubber continuous body 27s may be cut unstably, or the linear crimping part j may be broken. In the worst case, the pressure-bonding portion j may penetrate. Therefore, in this example, the vibration of the cutter roll 51d is suppressed by devising the arrangement of the cutter blades C. Hereinafter, this device will be described.
  • the thread rubber continuums 27 s, 27 s... To be cut are placed in the MD direction in the lower region AD of the sheet-like member 20 asb along the MD direction.
  • 11 are arranged side by side in the same CD direction with an appropriate interval between the adjacent thread rubber continuum 27s.
  • the rotation operation is performed in conjunction with the conveying operation of the sheet-like member 20asb, thereby cutting the 11 thread rubber continuums 27s, 27s... As shown in FIG. 9B.
  • And is performed for each area AL1 corresponding to the non-stretchable area AL in the lower area AD. At that time, as shown in FIG. Is going on.
  • each cutter block 54 on the outer peripheral surface 51 da of the cutter roll 51 d is provided with one cutter blade C for each of the thread rubber continuous bodies 27 s, 27 s. ing.
  • each cutter block 54 since 11 thread rubber continuums 27s, 27s,... Are arranged in the lower region AD as described above, each cutter block 54 has 11 cutter blades C, C ... is provided.
  • each cutter blade C cuts one corresponding thread rubber continuous body 27 s at one PC in the MD direction.
  • FIG. 9B As shown in FIG. 11, as an example, a plurality of 11 linear crimping portions j, j... Are formed by shifting the position PC1 in the CD direction. Note that the concept of the linear crimp portion j includes a linear fused portion formed by fusing two continuous sheets 21s and 22s to each other. Furthermore, as shown in FIG. 11, these 11 cutter blades C are provided with their positions in the rotational direction Dc51d being shifted from each other. For convenience of explanation, each of the 11 cutter blades C is shown in FIG. New symbols C1 to C11 are respectively attached to the blades C, C... In the order of arrangement from the upstream side to the downstream side in the rotation direction Dc51d.
  • the two cutter blades C1 and C2 are arranged as follows. That is, these two cutter blades C1 and C2 are arranged adjacent to each other in the rotational direction Dc51d.
  • the blade edge of the cutter blade C1 located downstream in the rotational direction Dc51d is at least the same blade edge.
  • the blade tip of the upstream cutter blade C2 overlaps the rotational direction Dc51d.
  • the cutting reaction force that can act on the cutter roll 51d along with the cutting can be received not only by the former cutter blade C1 but also by the latter cutter blade C2 after the cutting.
  • the vibration of the cutter roll 51d that can occur with the fluctuation of the reaction force of the cutting after the cutting of the continuous body 27s can be suppressed in the two-point support state. As a result, the vibration of the cutter roll 51d can be effectively suppressed.
  • At least one of two cutter blades C5 and C9 is located between the former cutter blade C1 and the latter cutter blade C2 in the CD direction.
  • the cutter blades C1 and C2 that are in the two-point support state are greatly separated in the CD direction. That is, the support span in the two-point support state is increased. This can effectively contribute to stabilization of the two-point support state, and as a result, the vibration of the cutter roll 51d can be more reliably suppressed.
  • cutter blades C1 and C2 are also established when attention is paid to the cutter blades C2 and C3.
  • any cutter blade C, C... Is in a two-point support state with a large support span as described above, except for the cutter blade C11 that finally cuts the thread rubber continuous body 27s.
  • the vibration of the cutter roll 51d can be more effectively suppressed.
  • FIG. 11 when attention is paid to the two cutter blades C5 and C6 adjacent to the rotation direction Dc51d, when the cutter blade C5 located on the downstream side in the rotation direction Dc51d cuts the continuous body 27s of the rubber thread.
  • the cutter blade C6 already positioned on the upstream side is also in a state of sandwiching the sheet-like member 20asb with the anvil roll 51u. That is, the upstream cutter blade C6 exists across the position PC where the downstream cutter blade C5 cuts the thread rubber continuous body 27s in the rotational direction Dc51d. More specifically, the vertical direction of the two-dot chain line in which the pointing position of the arrow PC indicating the cutting position of the cutter blade C5 in FIG. 11 overlaps the downstream end (right end in FIG. 11) of the cutter blade C6 in the rotation direction Dc51d. It is located slightly upstream (left side in FIG. 11) in the rotational direction Dc51d from the ruled line (ruled line along the CD direction). *
  • the cutting reaction force that can act on the cutter roll 51d from when the cutter blade C5 is cut can be reliably received not only by the downstream cutter blade C5 but also by the upstream cutter blade C6.
  • the vibration of the cutter roll 51d that can be caused by fluctuations in the cutting reaction force can be quickly suppressed in the two-point support state of the downstream cutter blade C5 and the upstream cutter blade C6.
  • the direction of the cutter blades C and C is set to an inclination angle ⁇ having an appropriate size other than 90 ° from the CD direction. And all the cutter blades C, C... Are aligned not only in the magnitude of the inclination angle ⁇ but also in the direction of inclination. Specifically, in this example, the inclination angle ⁇ is set to 30 °, and with respect to the direction of inclination, the cutting edges of all the cutter blades C, C... Move toward the downstream side of the rotation direction Dc51d. They are set to be displaced to the same side in the CD direction (lower side in FIG. 11). *
  • the change in the separation distance in the CD direction between the cutter blades C, C that are in a two-point support state can be reduced over the rotation direction Dc51d.
  • the two-point support state can be stabilized.
  • each of the corresponding amounts of inclination is compared to the case where the cutting edge is parallel to the CD direction. It is possible to ensure a long cutting time of the continuous thread rubber 27s. As a result, the continuous thread rubber 27s can be reliably cut.
  • the present invention is not limited to this as long as the cutter blades C and C can be overlapped with each other in the rotation direction Dc51d and a long cutting time can be secured. That is, the magnitude of the inclination angle ⁇ is not limited to the above 30 °, and the magnitude of the inclination angle ⁇ may not be uniform over all the cutter blades C, C. It is not necessary to align the inclination direction over all the cutter blades C, C.
  • the number of cutter blades C that simultaneously clamp the sheet-like member 20asb with the anvil roll 51u across all the cutter blades C1 to C11 belonging to the same cutter block 54 is set to 2 or less. ing.
  • the numerical value of 2 is the minimum value of the number of cutter blades C that simultaneously clamp the sheet-like member 20asb. Therefore, it is possible to effectively prevent the pinching force applied to each cutter blade C through the above-described form of the pressure contact force from being dispersed and reduced in a large number of cutter blades C.
  • the continuous thread rubber 27s can be reliably cut.
  • FIG. 13 is a schematic plan view of a modification of the arrangement pattern of the cutter blades C, C.
  • the arrangement pattern of this modification is used for cutting all seven thread rubber continuums 27s, 27s... Arranged in the central area ADc in the lower area AD of the back band member 20b. Is done. Since it is obvious from this FIG. 13 that this arrangement pattern also satisfies all the above-mentioned rules, detailed description thereof will be omitted.
  • FIG. 14 is a schematic plan view of another example of the sheet-like member 20asb that can be suitably processed by the manufacturing apparatus 30, and
  • FIG. 15 is a schematic diagram illustrating how the sheet-like member 20asb is processed by the manufacturing apparatus 30. It is a side view. *
  • the sheet-like member 20asb is provided with a film member 28 for the purpose of drawing a pattern such as an illustration. And this point is mainly different from the above-described sheet-like member 20asb of FIG. 9A, and other points are substantially the same as the sheet-like member 20asb. Therefore, in the following, this difference will be described, and the description other than that will be omitted.
  • the film member 28 is made of a thermoplastic resin such as PE. And as shown in FIG. 14, the film member 28 is arrange
  • PE thermoplastic resin
  • the film member 28 supports the thread rubber continuous body 27s from the opposite side (upper side in FIG. 15) of the cutter blade C.
  • the thread rubber continuum 27s can be supported so as not to move in the thickness direction (vertical direction), which is the clamping direction. Therefore, it is possible to effectively prevent the thread rubber continuous body 27s from sinking in the clamping direction (moving upward in FIG. 15) and the like, which can occur during cutting. As a result, the thread rubber continuous body 27s can be reliably secured with high cutting performance. Can be cut.
  • the cutter roll 51d has the side ring 51SR, but the gap G (FIG. 12) can be formed between the cutter blade C of the cutter roll 51d and the outer peripheral surface 51ua of the anvil roll 51u. If so, the side ring 51SR may be omitted.
  • the actuator 53 such as the aforementioned hydraulic cylinder shown in FIG. 10B
  • the vertical position as the contact / separation direction of the cutter roll 51d is adjusted so that the size of the gap G becomes a constant value.
  • a feed screw mechanism using a servo motor as a drive source can be used as the actuator 53 described above.
  • a plurality of thread rubber continuums 27s, 27s... are exemplified as the plurality of elastic members, and each of the plurality of thread rubber continuums 27s, 27s.
  • the cutter blades C, C... are provided one by one, but the present invention is not limited to this.
  • one or more cutter blades C may be associated with two or three continuous thread rubbers 27s as an example of two or more. That is, one cutter blade C may be provided so as to straddle two thread rubber continuums 27s, 27s or three thread rubber continuums 27s, 27s, 27s.
  • the sheet-like member 20asb has the continuous sheet 21s of the outer layer sheet and the continuous sheet 22s of the inner layer sheet, but another continuous sheet may be laminated.
  • the thread rubber continuous body 27s is exemplified as the elastic member, but the elastic member is not limited thereto.
  • a belt-like elastic member such as a flat rubber continuous body may be used.
  • the cutter roll 51d is illustrated as the cutter rotating body, and the anvil roll 51u is illustrated as the anvil rotating body, but this is not a limitation.
  • an endless belt may be used as each of the cutter rotating body and the anvil rotating body.
  • the three-piece type disposable diaper 1 is illustrated as an example of the absorbent article, but the present invention is not limited thereto.
  • a thread rubber continuous body 27s provided on a sheet-like member used in a two-piece type disposable diaper may be cut by the cutter device 50 described above.
  • a two-piece type disposable diaper has a two-layered exterior sheet having an abdominal part, a crotch part, and a dorsal part as a first component, and is fixed to the skin side of the exterior sheet. This is a type of diaper having a sexable main body 10 as a second part.
  • the continuous sheet of the exterior sheet corresponds to the above-described sheet-like member 20asb, and each of the thread rubber continuous bodies 27s, 27s... Is formed between two layers of the continuous sheet of the exterior sheet. It will be inserted in between.
  • the pants-type disposable diaper 1 is illustrated as an example of the absorbent article, but the present invention is not limited thereto. That is, it may be a tape-type disposable diaper.
  • the tape-type disposable diaper has an abdominal side that covers the wearer's torso from the abdomen side and a back side that covers the torso from the back side. It is a type of diaper that uses a fastening tape to connect.
  • the absorbent article is not limited to the disposable diaper 1 described above. That is, the manufacturing method and the manufacturing apparatus 30 of the present invention can be applied to any absorbent article that uses the sheet-like member 20asb as described above as a material. Therefore, the concept of this absorbent article includes a urine absorbing pad and a sanitary napkin.

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  • Health & Medical Sciences (AREA)
  • Epidemiology (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Absorbent Articles And Supports Therefor (AREA)

Abstract

Une feuille composite est conçue de telle sorte que : un élément élastique continu dans une direction de transport tout en étant étiré dans la direction de transport est disposé entre une première feuille continue qui est continue dans la direction de transport et une seconde feuille continue qui est continue dans la direction de transport ; et l'élément élastique est fixé dans une région correspondant à au moins une région présentant une caractéristique de haut étirage/retrait. L'élément élastique est découpé dans une région correspondant à une région présentant une caractéristique de faible étirage/retrait au niveau d'un emplacement dans la direction de transport. Ceci permet à l'élément élastique de se rétracter vers une région correspondant à la région présentant une caractéristique de haut étirage/retrait, ce qui amène la région présentant une caractéristique de haut étirage/retrait et la région présentant une caractéristique de faible étirage/retrait à être formées et agencées côte-à-côte dans la direction de transport dans la feuille composite. Lorsque, pendant la formation les régions présentant des caractéristiques de haut et de faible étirage/retrait, le feuille composite passe dans la direction de transport entre un corps de coupe rotatif et un corps d'enclume rotatif qui tournent avec les surfaces périphériques externes de ceux-ci faisant face à l'un à l'autre, un bord de coupe sur la surface périphérique externe du corps de coupe rotatif et du corps d'enclume rotatif et presse la feuille composite tandis qu'un espace est maintenu entre le corps de coupe rotatif et le corps d'enclume rotatif, ce qui permet de couper l'élément élastique tout en formant une section pressée et liée dans laquelle la première feuille continue et la deuxième feuille continue sont pressées et liées ensemble, la section pressée et liée étant formée au niveau de la position de la feuille composite au niveau de laquelle la feuille composite est saisie et pressée.
PCT/JP2014/077944 2014-10-21 2014-10-21 Procédé et dispositif de fabrication d'un élément de type feuille pour article absorbant Ceased WO2016063346A1 (fr)

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JP2015507836A JP5789730B1 (ja) 2014-10-21 2014-10-21 吸収性物品に係るシート状部材の製造方法、及び製造装置

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JP5941963B2 (ja) * 2014-11-11 2016-06-29 ユニ・チャーム株式会社 吸収性物品に係るシート状部材の製造方法、及び製造装置
JP6343584B2 (ja) * 2015-05-01 2018-06-13 ユニ・チャーム株式会社 吸収性物品
WO2019009086A1 (fr) * 2017-07-07 2019-01-10 パナソニックＩｐマネジメント株式会社 Dispositif laser à semi-conducteur

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