WO2023127472A1 - 積層体 - Google Patents
積層体 Download PDFInfo
- Publication number
- WO2023127472A1 WO2023127472A1 PCT/JP2022/045638 JP2022045638W WO2023127472A1 WO 2023127472 A1 WO2023127472 A1 WO 2023127472A1 JP 2022045638 W JP2022045638 W JP 2022045638W WO 2023127472 A1 WO2023127472 A1 WO 2023127472A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- laminate
- width direction
- joints
- side edge
- joint portion
- Prior art date
Links
- 229920001971 elastomer Polymers 0.000 claims abstract description 73
- 239000000806 elastomer Substances 0.000 claims abstract description 73
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- 229920002725 thermoplastic elastomer Polymers 0.000 claims abstract description 5
- 239000011295 pitch Substances 0.000 claims description 27
- 230000008602 contraction Effects 0.000 claims description 21
- 229920005989 resin Polymers 0.000 claims description 13
- 239000011347 resin Substances 0.000 claims description 13
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- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
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- 239000000203 mixture Substances 0.000 description 1
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- 239000000126 substance Substances 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
-
- 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
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- A—HUMAN NECESSITIES
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- 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
- A61F13/49007—Form-fitting, self-adjusting disposable diapers
- A61F13/49009—Form-fitting, self-adjusting disposable diapers with elastic means
- A61F13/49011—Form-fitting, self-adjusting disposable diapers with elastic means the elastic means is located at the waist region
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- A—HUMAN NECESSITIES
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- 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
- A61F13/49007—Form-fitting, self-adjusting disposable diapers
- A61F13/49009—Form-fitting, self-adjusting disposable diapers with elastic means
- A61F13/4902—Form-fitting, self-adjusting disposable diapers with elastic means characterised by the elastic material
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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
- A61F13/51—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 outer layers of the pads
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
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- B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
- B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
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- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
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- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/02—Physical, chemical or physicochemical properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
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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
- 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
- A61F13/49007—Form-fitting, self-adjusting disposable diapers
- A61F13/49009—Form-fitting, self-adjusting disposable diapers with elastic means
- A61F13/4902—Form-fitting, self-adjusting disposable diapers with elastic means characterised by the elastic material
- A61F2013/49022—Form-fitting, self-adjusting disposable diapers with elastic means characterised by the elastic material being elastomeric sheet
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
- B32B2260/02—Composition of the impregnated, bonded or embedded layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
- B32B2260/04—Impregnation, embedding, or binder material
- B32B2260/046—Synthetic resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B2274/00—Thermoplastic elastomer material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/514—Oriented
- B32B2307/516—Oriented mono-axially
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
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- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/732—Dimensional properties
- B32B2307/737—Dimensions, e.g. volume or area
- B32B2307/7375—Linear, e.g. length, distance or width
- B32B2307/7376—Thickness
Definitions
- the present invention relates to a stretchable laminate that can be used as part of disposable wearing articles such as disposable diapers and pants.
- An elastic resin material containing a thermoplastic resin as a main component is extruded into a film, cooled, then laminated with a base sheet on at least one side of the film, and intermittently heat-sealed between the film and the base sheet. It has been attempted to produce stretchable composite sheets or stretchable laminates.
- the resin material in a molten state immediately after extruding the film shrinks in the width direction perpendicular to the extrusion direction due to necking, and after cooling, the film on both side edges in the width direction shrinks.
- the stretch stress (mechanical properties) of the stretchable composite sheet is different in the width direction.
- the object of the present invention is to obtain a stretchable composite sheet that can reduce the waste of materials and has a small variation in elongation stress, that is, to obtain a stretchable laminate.
- the laminate of the present invention is a laminate W in which a thermoplastic elastomer film F having greater elasticity in the stretching direction Ds than in the width direction Dw orthogonal to the stretching direction Ds and nonwoven fabric sheets S1 and S2 are laminated together.
- the elastomer film F and the sheets S1 and S2 are heat-sealed and laminated at each joint 8 intermittently arranged in the width direction Dw and the stretch direction Ds,
- the sum of the lengths of the joint portions 8 in the width direction Dw at the side edge portions AE per unit area of the laminate at at least one side edge portion AE in the width direction Dw is It is larger than the sum of the lengths in the width direction Dw of the joint portions 8 at the non-side edge Ac in the width direction Dw per unit area of the laminate W.
- the pair of nonwoven fabric sheets and the elastomer film F are heat-sealed to each other at the joint 8 .
- the periphery of the joint portion 8 of the elastomer film F is broken during heat-sealing, or is broken during re-stretching such as when worn, and holes appear when the elastomer film F is stretched. Since the elastomer film is missing in the opening, the opening is greatly elongated in the stretching direction Ds with a small tensile force.
- the magnitude of this elongation increases as the length of the opening in the width direction Dw increases.
- the length of the opening in the width direction Dw is approximately the length of the joint 8 . Therefore, the larger the sum of the lengths of the joints 8 in the width direction Dw, the greater the expansion of the laminate in the stretching direction Ds with a smaller tensile force.
- part of the side edges of the laminate may be cut off.
- the side edge portion means a region near the edge of the laminate and in which the sum of the lengths in the width direction Dw of the joint portion is greater than the sum of the lengths in the width direction of another joint portion,
- Non-side edge means a portion other than the side edge.
- FIG. 1 is a perspective view showing one embodiment of the laminate of the present invention.
- the upper nonwoven fabric sheet is drawn flat.
- the elastomer films and sheets are enlarged in the thickness direction and drawn thicker than they actually are, in order to facilitate understanding of the structure of the laminate.
- 2A is a cross-sectional view of the same laminate
- FIG. 2B is a partial plan view of the laminate
- FIG. 2C is an enlarged partial cross-sectional view of a joint and its surroundings.
- FIG. 3 is a conceptual diagram showing an example of a method for manufacturing a worn article.
- FIG. 4A is a plan view showing an example of a worn article
- FIG. 4A is a plan view showing an example of a worn article
- FIG. 4B is an enlarged plan view showing a part of the waist portion
- FIG. 4C is a longitudinal sectional view of the same.
- the joints are colored in gray for easy viewing, and the elastomer film is given a dot pattern.
- FIG. 5 is an enlarged plan view showing a part of the waist portion.
- 6A is an enlarged plan view showing the first joint portion
- FIG. 6B is a sectional view thereof
- FIG. 6C is an enlarged plan view showing a third joint portion
- FIG. 6D is a sectional view thereof.
- 7A and 7B are layout diagrams showing an example of a process for forming film pass lines.
- 8A and 8B are layout diagrams showing an example of a process for forming pass lines for a film, respectively.
- 9A and 9B are schematic layout diagrams respectively showing an embodiment of the laminate manufacturing method and apparatus of the present invention.
- the length L of each joint 8 in the width direction Dw is longer than that of the joint 8 in the expansion and contraction direction Ds.
- the length of the joint in the expansion and contraction direction may be longer than the length in the width direction, but in this case, the effect of reducing the variation in the extension stress in the width direction is reduced.
- the length of the joint portion in the width direction longer than the length in the stretching direction, it is easy to obtain the effect of reducing the variation in the stretching stress in the width direction.
- the lengths L 1 and L 2 of the width direction Dw at the side edges AE are set longer than the length L 3 of the width direction Dw at the non-side edges Ac.
- the length in the width direction of the side edge portion becomes long, and it becomes easier to further reduce the variation in the above-described elongation stress in the width direction.
- the degree of necking is greater nearer the edges of the laminate, and the elastomeric film is often thicker nearer the edges.
- first joints 8 1 and second joints 8 2 intermittently arranged in the stretching direction Ds are provided in the side edges AE .
- the first joints 8-1 are provided at positions closest to the edge E of the side edges AE
- the row of the second joints 8-2 is provided next to the row of the first joints 8-1 . good too.
- the length L1 of the first joint portion 81 in the width direction Dw is longer than the length L2 of the second joint portion 82 in the width direction Dw.
- the first joint portion closest to the edge of the laminate has a longer width in the width direction than the second joint portion in the adjacent row, so that the closer to the edge, the thicker the elastomer film. Variation can be reduced.
- the non-side edge Ac is provided with a plurality of third joints 83 ,
- the length L2 of the second joint portion 82 in the width direction Dw is longer than the length L3 of the third joint portion 83 in the width direction Dw. In this case, it is possible to further reduce the variation in tensile stress between the side edges and the non-side edges.
- the arrangement pitch P1 of the joints 8 in the expansion/contraction direction Ds at the side edges AE is more than the arrangement pitch P3 of the joints 8 in the expansion/contraction direction Ds in the non-side edges Ac. , P2 are set small.
- the pitch of the joining portions By setting the pitch of the joining portions in this way, the sum of the lengths of the side edges can be set larger than the sum of the lengths of the non-side edges.
- the arrangement pitch P1 of the first joint portions 81 in the expansion / contraction direction Ds is smaller than the arrangement pitch P2 of the second joint portions 82 in the expansion/contraction direction Ds.
- the arrangement pitch of the first joints closest to the edge of the laminate is smaller than that of the second joints in the adjacent row, so that the closer to the edge the thicker the elastomer film, the greater the variation in tensile stress. obtain.
- the arrangement pitch P3 of the second joints 82 in the expansion/contraction direction Ds is greater than the arrangement pitch P3 in the expansion/contraction direction Ds of the third joints 83 in one row of the non-side edge portions Ac. 2 is small. In this case, it is possible to further reduce the variation in tensile stress between the side edges and the non-side edges.
- the first area ratio ⁇ 1 of the area of the joint portion 8 at the side edge portion AE to the unit area of the laminate at at least one side edge portion AE in the width direction Dw is It is larger than a second area ratio ⁇ 2 of the area of the joint portion 8 at the non-side edge portion Ac to the unit area of the laminate W at the non-side edge portion Ac in the width direction Dw.
- the joints in the present invention will be described.
- the elastomer film and the sheet are heat-sealed to each other, thereby maintaining the laminated state of the film and the sheet.
- the joint where both are heat-sealed to each other is in a loose state where the prestress generated during manufacturing is removed. Therefore, the joints reduce the susceptibility to shrinkage of the laminate.
- part of the resin component of the elastomer film enters between the fibers of the nonwoven fabric sheet, and the mechanically effective thickness of the film is reduced. Therefore, each joint has less resistance to elongation than its surroundings. Therefore, when the laminate is pulled in the stretching direction, it easily stretches.
- the joints can be said to be in a "saggy state" in the no-load state because of the characteristics of the joints that reduce the easiness of contraction of the laminate and facilitate the elongation thereof.
- the first area ratio ⁇ 1 of the joint at the side edge is greater than the second area ratio ⁇ 2 at the non-side edge. That is, the side edge has a larger area ratio of the joint than the non-side edge. Since the area ratio of the joint is large in this way, even if the side edge is thicker than the non-side edge due to necking, the "slack" joint reduces the drag of the side edge. , can be approximated to the non-side edge drag. Therefore, the variation in elongation stress in the width direction of the laminate is reduced.
- each joint portion 8 of a plurality of joint portions 8 in which the nonwoven fabric sheets S1 and S2 and the elastomer film F are heat-sealed to each other is formed by heat-sealing the sheets S1 and S2 and the elastomer film F to each other. including a fused region ⁇ ,
- the elastomer film F is broken at a boundary line 80 defining the fused region ⁇ .
- the opening 8H defined by the boundary line 80 expands greatly when the laminate is stretched in the stretching direction Ds. Therefore, the side edges having the joints 8 that are long in the width direction Dw tend to stretch even though the elastomer film F is thick.
- the thickness Th1 of the elastomer film F at the at least one side edge AE may be greater than the thickness Th3 of the elastomer film F at the non-side edge Ac.
- a part of the resin forming the elastomer film F enters between the plurality of fibers forming the nonwoven fabric sheets S1 and S2.
- the thickness of the elastomer film F at the joint portion 8 is thinner than the thickness of the elastomer film F at the non-joint portion 9 around the joint portion 8 .
- This thin film reduces the resistance to elongation at each joint, thus facilitating smaller variations in elongational stress in the elastomeric film.
- the laminate may constitute at least part of the waistline of the disposable wearing article, and the at least one side edge AE may be the upper edge or the lower edge of the waistline.
- This elastic laminate can be used for various purposes.
- a case where the present laminate is applied to a disposable diaper (an example of a wearable article) will be exemplified and explained below.
- a diaper includes a waist portion that covers the wearer's torso and a crotch portion that covers the wearer's crotch.
- the laminate is used for the waist portion.
- the laminate W shown in FIGS. 4A to 4C is formed by sandwiching a thermoplastic and stretchable elastomer film F between a pair of breathable nonwoven fabric sheets S1 and S2 containing thermoplastic fibers. be.
- the pair of nonwoven fabric sheets S1 and S2 and the film F are connected to each other at a number of joints 8 shown in FIG . They are heat-sealed and laminated.
- the laminate W can be used, for example, for flaps and girths of disposable diapers. In that case, the waist direction is the stretch direction Ds.
- Each joint 8 may be formed by vibration energy of an ultrasonic horn, or may be formed by heating with a heating roll.
- FIG. 4A shows a wearable article 10.
- the wearing article 10 has an absorbent main body 20 and a waist portion 30 .
- the absorbent main body 20 is long in the longitudinal direction orthogonal to the waistline direction.
- the worn article may be a pants type as shown in FIG. 4A, or may be a diaper type.
- the absorbent main body 20 is provided with an absorbent core (not shown). This absorbent core absorbs bodily fluids.
- the absorbent core is sandwiched between the topsheet and the backsheet. Each sheet and absorbent core are laminated together.
- the top sheet is made of a liquid-permeable thin nonwoven fabric and covers the skin surface of the absorbent core.
- a cuff (not shown) may be provided on the top sheet.
- the back sheet covers the non-skin surface of the absorbent core and is made of a liquid-impermeable resin sheet.
- a waist part 30 is attached to the longitudinal end of the absorbent main body 20 .
- the waist portion 30 is formed of a stretchable laminate W, extends in the wearer's waist direction, and is configured to cover the wearer's waist.
- the absorbent body 20 is configured to cover the crotch area of the wearer.
- FIG. 4B and 4C show structural examples of the laminated body W forming the waist portion 30.
- FIG. 4B and 4C show structural examples of the laminated body W forming the waist portion 30.
- first and second joints 8 1 , 8 2 are provided in a plurality of rows and a plurality of columns (two columns) on the upper edge 32 of the waist portion 30 .
- the vertically long third joints 83 are provided in a plurality of rows and a plurality of columns (in a matrix) on the lower portion 31 of the waist portion 30 .
- the joints 8 are intermittently arranged in the waistline direction and intermittently arranged in the longitudinal direction.
- a non-side edge portion Ac is formed in a region (intermediate portion) between a pair of side edge portions AE and AE .
- the laminate W shown in FIG. 1 includes a thermoplastic elastomer film F having greater elasticity in the stretching direction Ds than in the width direction Dw perpendicular to the stretching direction Ds, and first and second nonwoven fabric sheets S1 and S2. Laminated.
- the elastomer film F is sandwiched between a pair of sheets S1 and S2, but the number of nonwoven fabric sheets may be one.
- the thickness Th1 of the elastomer film F at the side edges AE on both sides is greater than the thickness Th3 of the elastomer film F at the non-side edges Ac.
- the joints 8 colored in gray are intermittently arranged in the width direction Dw and the stretch direction Ds. They are fused and laminated to each other.
- the thickness of the elastomer film F at the joint 8 is substantially thinner than the thickness of the elastomer film F at the non-joint portion 9 surrounding the joint 8 .
- the substantially thinned elastomeric film F reduces the elongation stress of the laminate W. As shown in FIG.
- each joint 8 in the width direction Dw corresponds to expansion and contraction of the joint 8. longer than that in direction Ds. That is, each joint 8 is, for example, a rectangle elongated in the width direction Dw. Each joint portion 8 having such a shape can easily reduce variations in stress in the width direction Dw generated in the laminate W. As shown in FIG.
- the sum ⁇ 1 of the first lengths and the sum ⁇ 2 of the second lengths are set as follows.
- Sum of first lengths ⁇ 1 The sum of the lengths of the joints 8 in the width direction Dw at at least one side edge AE in the width direction Dw per unit area of the laminate at the side edge AE .
- Sum of second lengths ⁇ 2 Sum of lengths of joint portions 8 in the width direction Dw at the non-side edges Ac in the width direction Dw per unit area of the laminate W at the non-side edges Ac.
- the first length sum ⁇ 1 defined above is greater than the second length sum ⁇ 2.
- the length L of each joint 8 and the pitch P of arrangement are set as follows. For the sake of convenience, subscripts are not attached when collectively referring to joints, lengths, and arrangement pitches.
- Each joint 8 may be rhombic, elliptical, hourglass-shaped, or the like. Also, the shape of each joint 8 may be a mixture of two or more shapes.
- the side edges A to E are provided with at least two rows of first joints 8-1 and second joints 8-2 intermittently arranged in the stretching direction Ds.
- the first joint portion 8-1 is provided at a position closest to the edge E in the side edge portions AE
- the row of the second joint portions 8-2 is provided next to the row of the first joint portions 8-1 .
- the non-side edge Ac is provided with a plurality of rows and a plurality of columns of third joints 83 .
- a fourth joint portion 84 having the same shape and size as the third joint portion 83 may be provided in a partial region of the side edge portions AE .
- the lengths and arrangement pitches of the first, second and third joints 8 are set as follows.
- the length of each joint 8 in the width direction Dw is set as follows.
- the lengths L 1 and L 2 in the width direction Dw at the side edges AE are longer than the length L 3 in the width direction Dw at the non-side edges Ac.
- the length L1 of the first joint portion 8-1 in the width direction Dw is greater than the length L2 of the second joint portion 82 in the width direction Dw.
- the lengths L 1 and L 2 of the first and second joint portions 8 1 and 8 2 in the width direction Dw are longer than the length L 3 of the third joint portion 8 3 in the width direction Dw.
- the length L2 of the second joint portion 8-2 may be longer than the length L1 of the first joint portion 8-1 .
- the arrangement pitch of the joint portions 8 in the width direction Dw is set as follows.
- the arrangement pitches P 1 and P 2 of the joints 8 in the stretch direction Ds at the side edges AE are smaller than the arrangement pitch P 3 of the joints 8 in the stretch direction Ds at the non-side edges Ac.
- the arrangement pitch P1 of the first joints 81 in the expansion/contraction direction Ds is smaller than the arrangement pitch P2 of the second joints 82 in the expansion/contraction direction Ds.
- the arrangement pitch P in the expansion and contraction direction Ds of the first and second joints 8 1 and 8 2 is greater than the arrangement pitch P 3 in the expansion and contraction direction Ds of the third joint 8 3 in one row of the non-side edge Ac.
- the arrangement pitch P2 of the second joints 8-2 may be smaller than the arrangement pitch P1 of the first joints 8-1 .
- it is desirable that the joints 8 are arranged in a zigzag manner so as not to be too close to each other.
- the lengths L 1 , L 2 and L 3 of the first, second and third joints need not be the same.
- the length L1 of the first joint portion may vary.
- each arrangement pitch P 1 , P 2 or P 3 may also vary.
- each of a plurality of joints 8 in which the nonwoven fabric sheets S1 and S2 and the elastomer film F are heat-sealed to each other is composed of the sheets S1 and S2 and the elastomer film F. are heat-sealed together.
- the elastomeric film F is in a broken state.
- the pair of non-woven fabric sheets S1 and S2 and the elastomer film F are heat-sealed to each other at the joints 8 colored in gray.
- the periphery of the joint 8 of the elastomer film F is broken during heat-sealing, or when it is re-stretched such as when worn.
- a hole 8H appears. Therefore, as can be seen by comparing FIGS. 6A and 6C, the longer the lengths L 1 to L 3 of the joints 8, the larger the openings 8H and the easier the laminate to stretch.
- first area ratio ⁇ 1 and the second area ratio ⁇ 2 are defined as follows.
- First area ratio ⁇ 1 Area ratio of the area of the joint portion 8 on at least one side edge AE in the width direction Dw to the unit area of the laminate at the side edge AE .
- Second area ratio ⁇ 2 Area ratio of the area of the joint portion 8 at the non-side edge Ac to the unit area of the laminate W at the non-side edge Ac.
- the first area ratio ⁇ 1 defined above is greater than the second area ratio ⁇ 2.
- Nip rolls sandwich the elastomer film F between two sheets (continuous nonwoven fabric) S1 and S2 having a pair of side edges AE extending in the conveying direction, and the first sheet S1 and the second sheet S2 and the elastomer film and F overlap each other to form a laminate W. As shown in FIG.
- the welding and joining may be heat sealing (heat welding) or welding by ultrasonic energy.
- the laminate W having the pair of side edges AE is slit along the transport direction by a slitter (not shown) while being transported in the transport direction.
- the laminate W becomes a pair of waistline continuities that form the front and rear waistlines 30 . That is, the laminate W having a non-side edge portion Ac between a pair of side edge portions AE as shown in FIG. be done.
- the two waistline continuities (laminates W) are relatively moved in the width direction Dw so as to separate from each other in the width direction Dw orthogonal to the conveying direction.
- the absorbent main body 20 straddles the pair of waistline continuities and partially overlaps each waistline continuum. Arranged (constructed) to form a continuous laminate W1.
- the continuous laminated body W1 is folded in two at the absorbent main body 20 so that the pair of waistline continuous bodies (laminated body W) overlap each other.
- Second seals are formed at end portions in the conveying direction of portions that become the front and rear waist portions 30, and the pair of waist continuous bodies are welded and joined to each other.
- This welding and joining may be welding by ultrasonic energy of an ultrasonic horn, or may be heat sealing.
- the continuous laminate W1 is cut into sizes (units) for individual wearing articles 10 along imaginary cutting lines indicated by two-dot chain lines. That is, in order to produce individual wearing articles 10 one after another, the continuous laminate W1 is cut one after another between the absorbent main bodies 20 adjacent to each other in the conveying direction. By this cutting, individual pants-type wearing articles 10 shown in FIG. 4A are obtained.
- the laminate thus forms at least a portion of the waistline portion 30 of the disposable wearing article, each of the side edges AE being an upper edge portion 32 of the waistline portion.
- FIG. 9B shows a steady state operation in which laminates W are continuously produced.
- the discharge section T is a well-known extruder called a T-die, and a molten thermoplastic elastomer (resin) is temporarily stored in the T-die.
- the T-die continuously produces the pre-elastomer M by ejecting a melted resin that becomes the pre-elastomer (an example of the film raw material) M from its ejection port TO.
- the pre-elastomer M discharged from the discharge port TO is caught on the outer peripheral surface of the first cooling roll T1 and is temporarily cooled, and is transported toward the outer peripheral surface of the second cooling roll T2 below the first cooling roll T1. be done.
- the pre-elastomer M is generally solidified and has elasticity (stretchability) as an elastomer film (an example of a thermoplastic film) F.
- the pre-elastomer M directed toward the second cooling roll T2 is secondary cooled by the outer peripheral surface of the second cooling roll T2. As a result, the pre-elastomer M is completely solidified into an elastomer film (elastic film) F.
- the secondarily cooled elastomer film F is sandwiched between the second cooling roll T2 and the nip roll Nr, and then directed to the joining roll Ar.
- the peripheral speed (conveyance speed) of the joining roll Ar is higher than that of the second cooling roll T2, so that the elastomer film F is stretched in the conveying direction between the nip roll Nr and the joining roll Ar.
- the molten resin becomes an elastomer film (thermoplastic film) F through the state of a pre-elastomer (film raw material) M.
- a pre-elastomer film raw material
- the molten resin as a substance transitions to the pre-elastomer M or transitions from the pre-elastomer M to the elastomer film F varies depending on the glass transition temperature, the thickness of the resin, and the room temperature. isn't it.
- the molten resin turns into a pre-elastomer M immediately after exiting the discharge port TO, and although it looks like a solid at first glance, it may have properties similar to a liquid without elasticity.
- the pre-elastomer M is changed to the elastomer film F at the portion where it is pulled downstream from the nip roll Nr, but when it becomes the elastomer film F after coming into contact with the second cooling roll T2 upstream of the nip roll Nr, There are various cases, such as the case where the elastomer film F is formed after coming into contact with one cooling roll T1.
- the film pass line 3 is a transport path for the film in which at least a portion of the film is in a pre-elastomer (film raw material) M state.
- first and second sheets S1 and S2 made of nonwoven fabric are supplied to the joining roll Ar.
- Each sheet S1, S2 is supplied to the joining roll Ar along a first pass line 1 or a second pass line 1A for sheets, respectively.
- the elastomer film F is introduced to the joining roll Ar while being sandwiched between the pair of sheets S1 and S2.
- a pair of sheets S1 and S2 and an elastomer film F are joined to each other by an ultrasonic horn H and stacked to form a laminate W.
- the laminated body W may be produced by heat welding with a heating roll instead of ultrasonic bonding with the ultrasonic horn H.
- the production of the laminate W is carried out continuously, but there are cases where the production is temporarily stopped due to size changes and the like. In this case, the formation of the film pass lines shown in FIGS. 7A to 9A is performed on the new elastomeric film F.
- FIG. 7A to 9A the formation of the film pass lines shown in FIGS. 7A to 9A is performed on the new elastomeric film F.
- Each cooling roll T1, T2 in FIG. 8B is rotatably supported by a slide base 6, and horizontally moved along a guider 4 by a cylinder 5 as shown in FIGS. 8B and 9A. be moved.
- Each cooling roll T1, T2 is rotationally driven at a peripheral speed Vs by a motor (not shown).
- the joining roll Ar is rotationally driven at a peripheral speed V higher than the peripheral speed Vs by a motor (not shown).
- each cooling roll T1, T2 is provided so as to be able to come into contact with and separate from the suspended pre-elastomer M in FIG. 7A.
- the ultrasonic horn H repeatedly vibrates the joining roll Ar with ultrasonic waves as shown in FIG.
- the laminate W is produced by bonding. That is, both the sheets S1 and S2 and the elastomer film F are conveyed while overlapping each other along the outer peripheral surface of the joining roll Ar, and the ultrasonic horn H vibrates the joining roll Ar with ultrasonic waves, thereby causing both the sheets S1 and S2 and the elastomer Ultrasonic energy is applied to the film F to bond and laminate the nonwoven fabric sheet and the elastomer film.
- This bonding is carried out by heat-sealing the elastomeric film F heated by ultrasonic energy to the non-woven fabric sheet.
- the film and sheet are joined while a tensile force acts on them due to the speed difference between the peripheral speed Vs of the second cooling roll T2 and the peripheral speed V of the joining roll Ar. Therefore, the elastomer film F softened by increasing the temperature is stretched in the stretching direction Ds of FIGS. 8H is formed on the elastomeric film F of the laminate W.
- the preferred embodiment has been described with reference to the drawings, but those skilled in the art will easily envision various changes and modifications within the obvious scope upon looking at this specification.
- the lower edge of the girth may have side edge structures.
- the upper and lower edges of the waist portion may have a side edge structure without slitting the laminate into two.
- the junction may be circular, square, or the like. Accordingly, such changes and modifications are intended to be within the scope of the invention as defined by the appended claims.
- the present invention can be used to manufacture laminates for wearing articles such as disposable diapers.
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Abstract
Description
前記幅方向Dwおよび伸縮方向Dsに間欠的に配置された各接合部8において、前記エラストマーフィルムFと前記シートS1,S2とが互いに熱融着されて積層され、
前記幅方向Dwの少なくとも一方の側縁部AEにおける積層体の単位面積当りの当該側縁部AEにおける前記各接合部8の前記幅方向Dwの長さの和が、
前記幅方向Dwの非側縁部Acにおける積層体Wの単位面積当りの当該非側縁部Acにおける前記各接合部8の前記幅方向Dwの長さの和よりも大きい。
前記第1接合部81は前記側縁部AEの最も縁Eに近い位置に設けられ、第2接合部82の列は前記第1接合部81の列の隣に設けられていてもよい。
このように、積層体の最も縁に近い位置の第1接合部が隣の列の第2接合部に比べ幅方向の長さが長いことにより、縁に近い程、厚いエラストマーフィルムの伸長応力のバラツキを小さくし得る。
前記第3接合部83の前記幅方向Dwの長さL3よりも、前記第2接合部82の前記幅方向Dwの長さL2が長い。
この場合、側縁部と非側縁部とで伸長応力のバラツキを更に小さくすることができる。
このように、接合部のピッチを設定すれば、側縁部の前記長さの和を非側縁部の前記長さの和よりも大きく設定し得る。
このように、積層体の最も縁に近い位置の第1接合部が隣の列の第2接合部に比べ配置ピッチが小さいことにより、縁に近い程厚いエラストマーフィルムの伸長応力のバラツキを小さくし得る。
この場合、側縁部と非側縁部とで伸長応力のバラツキを更に小さくすることができる。
前記幅方向Dwの非側縁部Acにおける積層体Wの単位面積に対する当該非側縁部Acにおける前記接合部8の面積の第2面積比α2よりも大きい。
各接合部においては、エラストマーフィルムとシートが互いに熱融着されており、これにより上記フィルムとシートとが積層された状態が維持される。両者が互いに熱融着された接合部は、製造時に生じたプレストレスが除去された緩んだ状態となっている。したがって、接合部は積層体の縮み易さを緩和する。
また、接合部においては、エラストマーフィルムの樹脂成分の一部が不織布のシートの繊維間に入り込んでおり、前記フィルムの力学的に有効な厚さが小さくなっている。そのため、各接合部はその周囲の部分に比べ、伸びに対する抗力が小さくなっている。したがって、積層体を伸縮方向に引っ張ったときに伸び易い。
前記融着領域αを定義する境界ライン80において、前記エラストマーフィルムFが破断した状態である。
この場合、前述のように、積層体が伸縮方向Dsに伸びる際に境界ライン80で定義される開孔8Hが大きく拡がる。そのため、幅方向Dwに長い接合部8を有する側縁部はエラストマーフィルムFが肉厚であるにもかかわらず伸び易い。
なお、本明細書のカタカナ表記の一部には、その意味をより明瞭にするために英単語を()書で併記している。
図4Aは着用物品10を示す。
この図に示すように、着用物品10は、吸収性本体20および胴回り部30を備えている。吸収性本体20は、胴回り方向に直交する縦方向に長い。着用物品は図4Aのパンツ型であってもよいし、オムツ型であってもよい。
図1に示す積層体Wにおいては、一対の側縁部AE,AEの間の領域(中間部)に非側縁部Acが形成されている。
第1長さの和Σ1:幅方向Dwの少なくとも一方の側縁部AEにおける積層体の単位面積当りの当該側縁部AEにおける各接合部8の幅方向Dwの長さの和。
第2長さの和Σ2:幅方向Dwの非側縁部Acにおける積層体Wの単位面積当りの当該非側縁部Acにおける各接合部8の幅方向Dwの長さの和。
接合部、長さおよび配置ピッチの各々について総称する場合等は、便宜上、下付数字を添えない。
一方、非側縁部Acには第3接合部83が複数行かつ複数列設けられている。なお、本例のように、側縁部AEの一部の領域には第3接合部83と同じ形状、大きさの第4接合部84が設けられていてもよい
図1において、非側縁部Acにおける前記幅方向Dwの長さL3よりも、側縁部AEにおける前記幅方向Dwの長さL1,L2が大きい。更に詳しくは、第2接合部82の前記幅方向Dwの長さL2よりも、第1接合部81の前記幅方向Dwの長さL1が大きい。また、第3接合部83の前記幅方向Dwの長さL3よりも、第1および第2接合部81,82の前記幅方向Dwの長さL1,L2が大きい。なお、第2接合部82の長さL2が第1接合部81の長さL1よりも大きくてもよい。
図1において、非側縁部Acにおける伸縮方向Dsについての接合部8の配置ピッチP3よりも、側縁部AEにおける伸縮方向Dsについての接合部8の配置ピッチP1,P2が小さい。更に詳しくは、第2接合部82の伸縮方向Dsの配置ピッチP2よりも、第1接合部81の伸縮方向Dsの配置ピッチP1が小さい。また、非側縁部Acの1つの列における第3接合部83の伸縮方向Dsの配置ピッチP3よりも、第1および第2接合部81,82の伸縮方向Dsの配置ピッチP1,P2が小さい。なお、第2接合部82の配置ピッチP2が第1接合部81の配置ピッチP1よりも小さくてもよい。
なお、各接合部8は互いに接近しすぎないように千鳥状に配列するのが望ましい。
また、各配置ピッチP1,P2またはP3についても同様にバラツキがあってもよい。
第1面積比α1:幅方向Dwの少なくとも一方の側縁部AEにおける積層体の単位面積に対する当該側縁部AEにおける接合部8の面積の面積比。
第2面積比α2:非側縁部Acにおける積層体Wの単位面積に対する当該非側縁部Acにおける接合部8の面積の面積比。
上記のように定義された第1面積比α1は第2面積比α2よりも大きい。
図3に示すように、搬送方向に延びるエラストマーフィルムFが搬送方向に伸張された状態で搬送方向に搬送される。
なお、積層体Wは超音波ホーンHによる超音波接合ではなく、加熱ロールにより熱溶着されて生成されてもよい。
図8Bの各冷却ロールT1,T2は、各々、スライドベース6に回転自在に支持され、ガイダ(guider)4に沿ってシリンダ(cylinder)5により、図8Bおよび図9Aに示すように水平方向に移動される。各冷却ロールT1,T2は図示しないモータにより周速度Vsで回転駆動される。一方、前記接合ロールArは図示しないモータによって前記周速度Vsよりも大きい周速度Vで回転駆動される。
たとえば、胴回り部の下縁部のみに側縁部の構造を有していてもよい。また、積層体を2つにスリットせずに、胴回り部の上下の縁部が側縁部の構造を有していてもよい。また、接合部は円形や正方形などであってもよい。
したがって、そのような変更および修正は、請求の範囲から定まる本発明の範囲内のものと解釈される。
2:積層体のパスライン 3:フィルム用パスライン
4:ガイダ 5:シリンダ 6:スライドベース
8,81,82,83:接合部 8H:開孔 80:境界ライン
10:着用物品 20:吸収性本体 30:胴回り部 31:下部 32:上縁部
21:第1ロール 22:第2ロール
Ac:非側縁部 AE:側縁部
Ds:伸縮方向 Dw:幅方向
F:エラストマーフィルム(熱可塑性フィルムの一例)
M:プレエラストマー(フィルム原料の一例)
S1:第1シート S2:第2シート
W:積層体
E:縁
Ar:接合ロール H:超音波ホーン Nr:ニップロール
L,L1,L2,L3:長さ
P,P1,P2,P3:ピッチ
T:吐出部 TO:吐出口 T1:第1冷却ロール T2:第2冷却ロール
Th1,Th3:厚さ
α:融着領域 α1,α2:面積比
Claims (15)
- 伸縮方向Dsに直交する幅方向Dwよりも前記伸縮方向Dsに伸縮性が大きい熱可塑性のエラストマーフィルムFと、不織布のシートS1,S2とが互いに積層された積層体Wであって、
前記幅方向Dwおよび伸縮方向Dsに間欠的に配置された各接合部8において、前記エラストマーフィルムFと前記シートS1,S2とが互いに熱融着されて積層され、
前記幅方向Dwの少なくとも一方の側縁部AEにおける積層体の単位面積当りの当該側縁部AEにおける前記各接合部8の前記幅方向Dwの長さの和が、
前記幅方向Dwの非側縁部Acにおける積層体Wの単位面積当りの当該非側縁部Acにおける前記各接合部8の前記幅方向Dwの長さの和よりも大きいことを特徴とする、積層体。 - 請求項1において、前記各接合部8の前記幅方向Dwの長さLが当該接合部8の前記伸縮方向Dsのそれよりも長い、積層体。
- 請求項2において、前記非側縁部Acにおける前記幅方向Dwの長さL3よりも、前記側縁部AEにおける前記幅方向Dwの長さL1,L2が長い、積層体。
- 請求項3において、前記側縁部AEにおいて前記伸縮方向Dsに間欠的に配置された少なくとも2列の第1接合部81および第2接合部82が設けられ、
前記第1接合部81は前記側縁部AEの最も縁Eに近い位置に設けられ、第2接合部82の列は前記第1接合部81の列の隣に設けられている、積層体。 - 請求項4において、前記第2接合部82の前記幅方向Dwの長さL2よりも、前記第1接合部81の前記幅方向Dwの長さL1が長い、積層体。
- 請求項5において、前記非側縁部Acには第3接合部83が複数設けられ、
前記第3接合部83の前記幅方向Dwの長さL3よりも、前記第2接合部82の前記幅方向Dwの長さL2が長い、積層体。 - 請求項2~6のいずれか1項において、前記非側縁部Acにおける前記伸縮方向Dsについての前記接合部8の配置ピッチP3よりも、前記側縁部AEにおける前記伸縮方向Dsについての前記接合部8の配置ピッチP1,P2が小さい、積層体。
- 請求項4において、前記第2接合部82の前記伸縮方向Dsの配置ピッチP2よりも、前記第1接合部81の前記伸縮方向Dsの配置ピッチP1が小さい、積層体。
- 請求項6において、前記非側縁部Acの1つの列における前記第3接合部83の前記伸縮方向Dsの配置ピッチP3よりも、前記第2接合部82の前記伸縮方向Dsの配置ピッチP2が小さい、積層体。
- 請求項1~9のいずれか1項において、
前記幅方向Dwの少なくとも一方の側縁部AEにおける積層体の単位面積に対する当該側縁部AEにおける前記接合部8の面積の第1面積比α1が、
前記幅方向Dwの非側縁部Acにおける積層体Wの単位面積に対する当該非側縁部Acにおける前記接合部8の面積の第2面積比α2よりも大きいことを特徴とする、積層体。 - 請求項1~10のいずれか1項において、
前記不織布のシートS1,S2と前記エラストマーフィルムFとが互いに熱融着された複数の接合部8の各接合部8は前記シートS1,S2および前記エラストマーフィルムFが互いに熱融着された融着領域αを含み、
前記融着領域αを定義する境界ライン80において、前記エラストマーフィルムFが破断した状態である、積層体。 - 請求項1~11のいずれか1項において、
前記少なくとも一方の側縁部AEにおける前記エラストマーフィルムFの厚さTh1が、前記非側縁部Acにおける前記エラストマーフィルムFの厚さTh3よりも大きい、積層体。 - 請求項1~12のいずれか1項において、
前記各接合部8において、前記エラストマーフィルムFを構成する樹脂の一部が、前記不織布のシートS1,S2を構成する複数の繊維の間に入り込んでいる、積層体。 - 請求項13において、
前記接合部8における前記エラストマーフィルムFの厚さが、当該接合部8の周囲の非接合部9における前記エラストマーフィルムFの厚さよりも薄い、積層体。 - 請求項1~14のいずれか1項において、
前記積層体は使い捨て着用物品10の胴回り部30の少なくとも一部を構成し、
前記少なくとも一方の側縁部AEは前記胴回り部30における上縁部32または下縁部である、積層体。
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