WO2022102305A1 - 伸縮積層シート、使い捨て着用物品、伸縮積層シートの製造方法および製造装置 - Google Patents
伸縮積層シート、使い捨て着用物品、伸縮積層シートの製造方法および製造装置 Download PDFInfo
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- WO2022102305A1 WO2022102305A1 PCT/JP2021/037345 JP2021037345W WO2022102305A1 WO 2022102305 A1 WO2022102305 A1 WO 2022102305A1 JP 2021037345 W JP2021037345 W JP 2021037345W WO 2022102305 A1 WO2022102305 A1 WO 2022102305A1
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- Prior art keywords
- film
- laminated sheet
- stretchable
- pair
- heat
- Prior art date
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- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0037—Other properties
- B29K2995/0046—Elastic
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/48—Wearing apparel
- B29L2031/4871—Underwear
- B29L2031/4878—Diapers, napkins
-
- 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
-
- 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
- B32B2307/70—Other properties
- B32B2307/724—Permeability to gases, adsorption
-
- 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
- B32B2555/00—Personal care
- B32B2555/02—Diapers or napkins
-
- 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
- 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
- B32B5/06—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 characterised by a fibrous or filamentary layer mechanically connected, e.g. by needling to another layer, e.g. of fibres, of paper
-
- 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
- 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
-
- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2509/00—Medical; Hygiene
- D10B2509/02—Bandages, dressings or absorbent pads
- D10B2509/026—Absorbent pads; Tampons; Laundry; Towels
Definitions
- the present invention relates to a stretchable laminated sheet, a disposable wearable article, a method for manufacturing a stretchable laminated sheet, and a manufacturing apparatus.
- Patent Document 1 A stretchable laminated sheet in which an elastic film is sandwiched between a pair of non-woven fabrics is known (Patent Document 1). An example of the structure of the sheet is shown in FIGS. 11A to 11D.
- FIG. 11A is an enlarged plan view showing the shape of the joint portion 1 formed on the stretchable laminated sheet S
- FIG. 11B is an enlarged plan view showing an opening H formed on the film F of the stretchable laminated sheet S
- FIG. 11C is an enlarged plan view.
- FIG. 11D is a cross-sectional view showing a cross section of the stretchable laminated sheet S in the non-stretched state
- FIG. 11D is a cross-sectional view showing a cross section of the stretchable laminated sheet S in the stretched state.
- the pair of non-woven fabrics NW constituting a part of the stretchable laminated sheet S contain thermoplastic fibers and have breathability.
- the film F constituting the other part of the stretchable laminated sheet S is thermoplastic and has elasticity.
- the pair of non-woven fabric NW and the film F are heat-sealed to each other at the gray-colored joint portion 1.
- the periphery of the joint portion 1 of the film F is broken at the time of heat fusion or at the time of re-stretching such as when worn, and in the stretched state of the film F of FIGS. 11B and 11D, the opening H shown by the broken line of FIG. 11B is shown. Appears. Therefore, in this stretched state, the stretchable laminated sheet S exhibits breathability. When such a stretchable laminated sheet S is used as the body of the worn article, stuffiness during wearing is suppressed.
- an object of the present invention is to provide a stretchable laminated sheet having good breathability and a disposable wearable article, and to provide a method and an apparatus for manufacturing such a stretchable laminated sheet.
- the stretchable laminated sheet of the present invention is a stretchable laminated sheet in which a thermoplastic and stretchable film F is laminated on at least one non-woven fabric NW containing thermoplastic fibers and having breathability.
- a plurality of joints 1 in which the nonwoven fabric NW and the film F are heat-sealed to each other and each joint 1 of the plurality of junctions 1 are at least one in which the nonwoven fabric NW and the film F are heat-sealed to each other.
- the stretchable laminated sheet of the present invention is a stretchable laminate in which a thermoplastic and stretchable film F is sandwiched between a pair of non-woven fabrics NW containing thermoplastic fibers and having breathability.
- At least one boundary line 10 defining the fusion region ⁇ , In the boundary line 10, the first venting portion 11 defined by the first opening H1 of the film F appearing in the stretched state of the film F and exhibiting air permeability, A second aeration defined by a second opening H2 adjacent to the fusion zone ⁇ , partitioned by the boundary line 10 and partially missing the film F, and exhibiting breathability in both stretched and non-stretched states.
- a unit 12 is provided.
- the disposable wear article of the present invention is a disposable wear article including the telescopic laminated sheet. It includes a waist circumference portion formed of the stretchable laminated sheet and extending in the waist circumference direction of the wearer so as to cover the wearer's torso, and an absorbent main body configured to cover the wearer's crotch.
- the first opening H1 appears in the extended state, so that the first venting portion 11 exhibits breathability through the pair of non-woven fabric NWs.
- the second venting portion 12 exhibits breathability through the second opening H2 in which a part of the film F is missing and the pair of non-woven fabric NW. Therefore, in both the stretched state and the non-stretched state, the air permeability is improved as compared with the conventional case.
- the manufacturing method of the present invention is a method for manufacturing a stretchable laminated sheet in which a thermoplastic and stretchable film F is laminated on at least one non-woven fabric NW containing thermoplastic fibers and having breathability.
- the step of heat-sealing the laminated nonwoven fabric NW and the film F to each other at a plurality of joints 1 and the joining portions 1 of the plurality of junctions 1 are obtained by heat-sealing the nonwoven fabric NW and the film F to each other.
- the step of forming the first opening H1 in the film F and A second aeration exhibiting breathability in both the stretched state and the non-stretched state by a part of the film F adjacent to the fused region ⁇ and partitioned by the boundary line 10 is lost due to the heat fusion.
- a step of generating a second opening H2 to be a portion 12 is provided.
- the production method of the present invention is a stretchable laminated sheet in which a thermoplastic and stretchable film F is sandwiched between a pair of non-woven fabrics NW containing thermoplastic fibers and having breathability. It is a manufacturing method of The transport process of transporting the pair of non-woven fabrics NW while stretching them, A transporting step of transporting the film F in an elongated state, and While performing these transfer steps, a step of stacking the films F so as to be sandwiched between the pair of nonwoven fabrics NW and a step of superimposing them on each other.
- the step of heat-sealing the pair of laminated non-woven fabrics NW and the film F to each other at a plurality of joints 1 and the joints 1 of the plurality of joints 1 have the pair of non-woven fabrics NW and the film F mutually.
- At least one boundary line 10 that defines the fusion zone ⁇ a part of the film F in the stretched state is broken by the heat fusion to become a first ventilation portion 11 that exhibits breathability in the stretched state.
- the step of forming the first opening H1 in the film F and A second aeration exhibiting breathability in both the stretched state and the non-stretched state by a part of the film F adjacent to the fusion zone ⁇ and partitioned by the boundary line 10 is lost due to the heat fusion.
- a step of generating a second opening H2 to be a portion 12 is provided.
- a part of the stretched film F is broken by tension at the boundary line 10 to form the first opening H1.
- the first opening H1 becomes the first ventilation portion 11 that allows the flow of air through the pair of non-woven fabric NWs in the extended state.
- "a part of the film F in the stretched state is broken by heat fusion” means that the periphery of the joint portion 1 of the film F is broken at the time of heat fusion, and also at the time of re-stretching after heat fusion. It means that it may break.
- a part of the film F adjacent to the fusion zone ⁇ and partitioned by the boundary line 10 is broken due to heat fusion or the breakage, and a second opening H2 is formed.
- the second opening H2 becomes a second ventilation portion 12 that allows air flow through the pair of non-woven fabric NWs in both the stretched state and the non-stretched state.
- the stretchable laminated sheet produced by this method has improved breathability in both the stretched state and the non-stretched state as compared with the conventional one.
- the manufacturing apparatus of the present invention is a manufacturing apparatus for a stretchable laminated sheet in which a thermoplastic and stretchable film F is laminated between at least one non-woven fabric NW containing thermoplastic fibers and having breathability.
- Anvil roll R having a plurality of protrusions 4 for heat-sealing the nonwoven fabric NW and the film F to each other at a plurality of joints 1.
- a fusion device 5 for heat-sealing the nonwoven fabric NW and the film F on the protrusion 4 in cooperation with the anvil roll R is provided.
- Each of the protrusions 4 of the plurality of protrusions 4 At least one convex surface ⁇ corresponding to the region to be heat-sealed in the joint portion 1.
- An edge line 40 that defines the at least one convex surface ⁇ and forms the first opening H1 of the film F that appears in the stretched state of the film F. It is provided with a notch 42 which is partitioned by the edge line 40 and has a notch 42 in which the convex surface ⁇ is cut out and a part of the film F is heat-sealed to generate a defective second opening H2.
- a stretchable laminated sheet in which a thermoplastic and stretchable film F is sandwiched between a pair of non-woven fabrics NW containing thermoplastic fibers and having breathability. It is a manufacturing equipment of Anvil roll R having a plurality of protrusions 4 for heat-sealing the pair of nonwoven fabrics NW and the film F to each other at a plurality of joints 1. A fusion device 5 for heat-sealing the nonwoven fabric NW and the film F on the protrusion 4 in cooperation with the anvil roll R is provided.
- Each of the protrusions 4 of the plurality of protrusions 4 At least one convex surface ⁇ corresponding to the region to be heat-sealed in the joint portion 1.
- An edge line 40 that defines the at least one convex surface ⁇ and forms the first opening H1 of the film F that appears in the stretched state of the film F. It is provided with a notch 42 which is partitioned by the edge line 40 and has a notch 42 in which the convex surface ⁇ is cut out and a part of the film F is heat-sealed to generate a defective second opening H2.
- the nonwoven fabric NW and the film F are in contact with the protrusion 4 via the nonwoven fabric NW and the film F, the nonwoven fabric NW and the film F on the protrusion 4 are heated, and the nonwoven fabric NW and the film F heat each other on the convex surface ⁇ . It is fused. At this time, the film F is maintained in the stretched state, so that the film F is broken along the edge line 40 of the convex surface ⁇ and the first opening H1 is formed.
- the convex surface ⁇ is provided with a notch 42, and the film F of the notch 42 is chipped due to softening due to heat when the first opening H1 is formed or the breakage, and the second opening H2 is formed. It is formed on the film F. This second opening H2 also appears when the film F is non-stretchable.
- the air permeability is improved as compared with the conventional case.
- FIG. 1A is a schematic perspective view showing a macroscopic structure of a stretchable laminated sheet
- FIG. 1B is a schematic front view showing a manufacturing apparatus for the sheet
- 2A and 2B are schematic plan views of the worn article shown in the extended state, respectively.
- 3A and 3B show the waistline portion, which is an example of the sheet, in a non-extended state
- FIG. 3A is a plan view showing the waistline portion
- FIG. 3B is an enlarged plan view showing a part of the waistline portion.
- FIG. 4 is an enlarged plan view showing a part of the sheet in the extended state in an enlarged manner.
- 5A-5D are super-enlarged views of the sheet in an elongated state in which the sheet is elongated in the longitudinal direction
- FIG. 5A is a plan view of the sheet
- FIGS. 5B, 5C and 5D are respectively in FIG. 5A. It is sectional drawing of line BB, line CC and line DD of the same sheet.
- FIG. 6 is an enlarged plan view showing a part of the sheet in the non-stretched state in an enlarged manner.
- 7A-7D are super-enlarged views of the sheet in the non-stretched state
- FIG. 7A is a plan view of the sheet
- FIGS. 7B, 7C and 7D are lines BB of the sheet in FIG. 7A, respectively.
- CC line and DD line cross-sectional view are lines BB of the sheet in FIG. 7A, respectively.
- FIG. 8A is an enlarged perspective view showing a part of the anvil roll
- FIG. 8B is an enlarged perspective view showing another example of the protrusion different from the protrusion of FIG. 8A.
- FIGS. 10A to 10D are super-enlarged views of the stretchable laminated sheet in a stretched state in which the stretchable laminated sheet is one sheet in the longitudinal direction
- FIG. 10A is a plan view of the sheet
- 10D is a sectional view taken along line BB, CC and DD of the same sheet in FIG. 10A, respectively.
- 11A to 11D are enlarged views showing a part of a conventional telescopic laminated sheet
- FIGS. 11A and 11B are plan views of the sheet
- FIGS. 11C and 11D are cross-sectional views of the sheet.
- FIGS. 5A and 7A the boundary of the second opening H2 is shown by a short broken line.
- FIG. 1A-9B show Embodiment 1 of the present invention.
- This telescopic laminated sheet can be used for various purposes.
- a case where the stretchable laminated sheet is applied to a disposable diaper (an example of a worn article) will be described as an example.
- the diaper has a waistline portion that covers the wearer's torso and a crotch portion that covers the wearer's crotch.
- the stretchable laminated sheet is used for the waist circumference portion.
- the stretchable laminated sheet S is formed by sandwiching a thermoplastic and stretchable film F between a pair of breathable nonwoven fabrics NW containing thermoplastic fibers.
- the pair of non-woven fabrics NW and the film F are heat-sealed and laminated with each other at a large number of joints 1 shown in FIGS. 3A and 3B.
- the telescopic laminated sheet S can be used, for example, for a flap of a disposable diaper or a waist circumference portion.
- the waist circumference direction X is the expansion / contraction direction in which the expansion / contraction laminated sheet S expands / contracts.
- Each joint 1 may be formed by the vibration energy of the ultrasonic horn, or may be formed by raising the temperature by heating.
- the worn article 6 includes an absorbent body 20 and a girth portion 30.
- the absorbent body 20 is long in the vertical direction Y orthogonal to the waist circumference direction X.
- the worn article may be the diaper type shown in FIG. 2A or the pants type shown in FIG. 2B.
- the absorbent body 20 is provided with an absorbent core (not shown). This absorption core absorbs body fluids.
- the absorption core is sandwiched between the top sheet and the back sheet. Each sheet and absorption core are laminated to each other.
- the top sheet consists of a thin, permeable non-woven fabric that 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 consists of a liquid-impermeable resin sheet.
- a waist circumference portion 30 is attached to the end portion of the absorbent main body 20 in the vertical direction Y. That is, the waist circumference portion 30 has an overlapping portion 34 on which the absorbent main body 20 overlaps.
- the waist circumference portion 30 is formed of the stretchable laminated sheet S and is configured to extend in the waist circumference direction X of the wearer and cover the wearer's torso.
- the absorbent body 20 is configured to cover the wearer's crotch.
- 3A and 3B show an example of the telescopic laminated sheet S constituting the waist circumference portion 30.
- the horizontally long joint portion 1 is provided on the upper edge portion 32 of the waist circumference portion 30 in a plurality of rows and in a plurality of columns (in a matrix shape).
- the vertically long joint portion 1 is provided in a plurality of rows and a plurality of columns (in a matrix shape) at the lower edge portion 31 and the intermediate portion 33 of the waist circumference portion 30.
- Each joint 1 is intermittently arranged in the waist circumference direction X and intermittently arranged in the vertical direction Y.
- the intermediate portion 33 is a portion between the lower edge portion 31 and the upper edge portion 32, excluding the lower edge portion 31 and the upper edge portion 32.
- the upper edge portion 32 is called a waist portion
- the lower edge portion 31 and the middle portion 33 are called a hip portion.
- each junction 1 of the plurality of junctions 1 includes, for example, two fusion regions ⁇ in which a pair of nonwoven fabrics and films are heat fused to each other.
- each fused region ⁇ is colored in gray.
- Each fusion region ⁇ is defined by one loop-shaped boundary line 10. Boundary line 10 is drawn with a solid line,
- the telescopic laminated sheet S includes a first ventilation portion 11 and a second ventilation portion 12.
- these ventilation portions 11 and 12 are drawn by broken lines.
- the first venting portion 11 is defined by the first opening H1 of the film F and exhibits breathability.
- the first opening H1 appears in the stretched state of the film F with the boundary line 10 opened as shown by a broken line.
- the second ventilation portion 12 is adjacent to the fusion zone ⁇ , is partitioned by the boundary line 10, and is defined by the second opening H2 in which a part of the film F is missing. Exhibits breathability in both stretched states.
- the pair of fused regions ⁇ of each joint 1 are close to each other.
- a second aeration portion 12 is formed between the fused regions ⁇ .
- the distance ⁇ between the two fused regions ⁇ that are close to each other is preferably larger than 0 mm and 3 mm or less, and more preferably 2 mm or less.
- the stretchable laminated sheet S When the stretchable laminated sheet S is pulled in the waist circumference direction X when the worn articles of FIGS. 2A and 2B are worn, the stretchable laminated sheet S extends in the waist circumference direction X.
- the film F easily extends in the waist circumference direction X and easily opens holes. Therefore, a large first opening H1 as shown by the broken line in FIG. 5A is formed in the stretchable film F. That is, by the pulling, no holes are formed in the pair of nonwoven fabrics NW having high strength, and the first openings H1 are formed only in the stretchable film F sandwiched between the pair of nonwoven fabrics NW.
- FIG. 1B shows an example of the apparatus for manufacturing the telescopic laminated sheet S.
- the film F is sandwiched between a pair of nip rolls R1 and R2, and is supplied toward the anvil roll R from between them.
- the pair of nonwoven fabrics NW are wound around the anvil roll R so as to sandwich the film F.
- Vibration energy is applied from the ultrasonic horn 50 to the three sheet-like objects NW and F.
- a protrusion 4 having a shape and arrangement matching the fusion pattern of FIG. 4 is formed as shown in FIG. 8A, and the sheet-like objects NW and F are fused to each other at the protrusion 4 (at the protrusion 4). Will be sealed).
- the film F of FIG. 1B is laminated with the non-woven fabric NW in a stretched state in which tension is applied by the nip rolls R1 and R2.
- the film F contracts (neck-in) in the width direction which is the vertical direction Y of the waist circumference portion. Therefore, it is preferable to apply tension to the film F immediately before the film is fused. Therefore, as shown in FIG. 1B, it is preferable to arrange the pair of nip rolls R1 and R2 upstream in the vicinity of the ultrasonic horn 50 and the anvil roll R.
- the ultrasonic horn 50 of FIG. 1B is an output unit of the fusion device 5, and in cooperation with the anvil roll R, the sheet-like objects NW and F overlapped with the three sheets in the joint portion 1 (FIG. 4). Vibration energy is applied to heat-fuse the nonwoven fabric NW and the film F to each other. That is, the fusion device 5 of this example is an ultrasonic fusion device that performs the fusion with ultrasonic energy.
- protrusion 4 of FIG. 8A of the anvil roll R As shown in FIG. 8A, a large number of protrusions 4 are intermittently arranged in the circumferential direction of the anvil roll R and intermittently in the axial direction Rs of the anvil roll R. A large number of these protrusions 4 are provided so as to correspond to the joint portion 1 (FIG. 4).
- the protrusion 4 in FIG. 8A is shown by enlarging only the portion corresponding to the joint portion 1 of the lower edge portion 31 of the waist circumference portion 30 in FIG. 3A, and the upper edge portion 32 in FIG. 3B. The corresponding one is not shown.
- Each protrusion 4 in FIG. 8A has two convex surfaces ⁇ in this example.
- the two convex surfaces ⁇ are close to each other through the notch 42.
- Each of these convex surfaces ⁇ corresponds to the fusion zone ⁇ in FIG. 5A, while the notch 42 (FIG. 8A) corresponds to the second opening H2.
- one convex surface ⁇ is defined by being surrounded by one loop-shaped edge line 40, and forms the first opening H1 of the film F that appears in the stretched state of the film F of FIG. 5A. ..
- the mechanism of this formation will be described in the manufacturing method described later.
- the edge line 40 of FIG. 8A has a small C-plane or radius rather than a sharp shape.
- a moderately sized C-plane or radius will allow the film F to be melted without damaging the non-woven fabric NW.
- the notch 42 in FIG. 8A is partitioned by the edge line 40, that is, defined between the two edge lines 40, 40, and the convex surface ⁇ is notched and formed.
- the notch 42 creates the second opening H2 in FIG. 7A in which the film F is missing during heat fusion of the film F. The mechanism of this formation will be described in the manufacturing method described later.
- the distance ⁇ in FIG. 7A corresponds to the width W (FIG. 8A) of the notch 42 in FIG. 8A, and is approximately or the same size.
- a continuous sheet of a pair of non-woven fabrics NW is conveyed while being stretched, and the film F is conveyed in an elongated state.
- the films F are overlapped with each other so that the films F are sandwiched between the continuous sheets of the pair of nonwoven fabrics NW.
- the nonwoven fabric NW is held with a tension that does not loosen, while the film F is conveyed on the anvil roll R in an elongated state so as to contract later.
- the film F is later shrunk into a non-stretched state, it is preferable to apply tension to the film F so that the permanent strain of the film F is larger than 0% and is about 10% or less.
- the ultrasonic horn 50 vibrates in the direction toward the anvil roll R. do.
- the nonwoven fabrics NW are thermally fused to each other via the film F in the fusion zone ⁇ of each of the joints 1 of FIGS. 5A to 5D to generate the stretchable laminated sheet S.
- the first opening H1 and the second opening H2 are formed in the film F as described below.
- First opening H1 appears.
- the first opening H1 becomes the first ventilation portion 11 when worn and exhibits breathability. It should be noted that a part of the first opening H1 may be temporarily closed after heat fusion, and the film F may be broken and appear again at the time of re-stretching such as when worn.
- the first opening H1 may appear by performing a stretching process as shown in Special Table 2000-513504 after the welding process.
- the first opening H1 is formed, and the second opening H2 is formed between the pair of fusion regions ⁇ and the fusion region ⁇ . That is, at the time of the heat fusion, the film F is pulled in the waist circumference direction X as described above, while when the first opening H1 described above is formed, the fusion region ⁇ and the fusion region ⁇ are formed. Since the distance between them is small, the film portion between the fusion zone ⁇ and the fusion region ⁇ is also damaged by being affected by heat from both sides during heat fusion. For example, it is presumed that the portion of this film is pulled in the girth direction X and broken along the boundary line 10, or is contracted in the vertical direction Y by necking and is damaged. The second opening H2 thus formed becomes the second ventilation portion 12 that exhibits air permeability in both the extended state and the non-extended state.
- the absorbent main body 20 is arranged on the stretchable laminated sheet S thus generated as shown in FIG. 2A, for example, a pants-type worn article 6 as shown in FIG. 2B is obtained.
- the stretched state of the stretchable laminated sheet S is a non-stretched state in which tension is not applied in the waist circumference direction X.
- the first opening H1 in FIGS. 5A and 5D is closed as shown in FIGS. 7A and 7D. Further, in this non-stretched state, gathers appear on the nonwoven fabric NW as shown in FIGS. 7C and 7D as the film F shrinks.
- the joint portion 1 of the upper edge portion 32 of the waist circumference portion 30 of FIG. 3B will be briefly described. As shown in FIGS. 9A and 9B, the joint portion 1 is formed long in the waist circumference direction X, that is, long along the elongation direction of the film. In this case, the first opening H1 is small and the film elongation is also small.
- the second opening H2 in FIG. 9A slightly expands in the extension direction (girth direction X) in the extension state of FIG. 9B, but for convenience of drawing, the width W of FIG. 9A and the width W of FIG. 9B are shown as the same. ing.
- FIGS. 9C to 9H show other examples of the joint portion 1.
- two long fused regions ⁇ and ⁇ may be separated from each other in the waist circumference direction X (extension direction).
- the fused region ⁇ may include a constricted portion ⁇ s and two main portions ⁇ m connected to each other by the constricted portion ⁇ s and larger than the constricted portion ⁇ s.
- the second opening H2 is adjacent to the constricted portion ⁇ s.
- each convex surface ⁇ includes a constricted portion ⁇ s and two main portions ⁇ m that are connected to each other by the constricted portion ⁇ s and are larger than the constricted portion ⁇ s.
- the notch 42 is formed between the two main portions ⁇ m.
- one junction 1 may include four fusion regions ⁇ .
- the fusional regions ⁇ are separated from each other in the stretching direction of the film and the two directions orthogonal to the stretching direction.
- the non-woven fabric NW and the film F may be connected to each other without breaking the film F at the upper and lower edges 100 of each joint portion 1. In this case, it is possible to maintain the state in which the nonwoven fabric NW of FIGS. 10C and 10D and the film F are integrally laminated by this chain.
- the inventions grasped from the above embodiments include the following preferred embodiments.
- each of the joints 1 constituting the plurality of joints 1 includes the plurality of fused regions ⁇ in close proximity to each other.
- the second ventilation portion 12 is formed between the plurality of fused regions ⁇ .
- the second aeration portion 12 When the second aeration portion 12 is present between the fused regions ⁇ , the second aeration portion 12 is likely to be formed.
- the distance between the plurality of fused regions ⁇ that are close to each other is larger than 0 mm and 3 mm or less.
- the fused region ⁇ comprises a constricted portion ⁇ s and a plurality of main portions ⁇ m that are connected to each other by the constricted portion ⁇ s and are larger than the constricted portion ⁇ s.
- the second ventilation portion 12 is formed between the plurality of main portions ⁇ m.
- the size of the second aeration portion 12 may be smaller than in the case where the fusion region ⁇ has a plurality of fusion regions ⁇ by the amount that the fusion region ⁇ has the constricted portion ⁇ s.
- the accuracy of forming the second opening H2 may be improved.
- the distance between the plurality of main portions ⁇ m is larger than 0 mm and 3 mm or less.
- the film F does not soften between the adjacent main portions ⁇ m, and the second opening H2 is less likely to be formed.
- the stretchable laminated sheet is further provided with a step of changing the stretchable laminated sheet from the stretched state to the non-stretched state.
- the permanent strain of the film F in the non-stretched state is larger than 0% and 10% or less.
- the permanent strain is large, the second opening H2 is likely to be formed even if the distance between the fused regions ⁇ is large, but if the permanent strain is too large, the elasticity is inferior. Therefore, it is preferable to set the permanent strain to 0 to 10% in these balances.
- each protrusion 4 comprises a plurality of said convex faces ⁇ in close proximity to each other.
- the notch 42 is formed between the plurality of convex surfaces ⁇ .
- the film F is damaged by heat or tension in the notch 42 during fusion.
- each convex surface ⁇ comprises a constricted portion ⁇ s and a plurality of main portions ⁇ m that are connected to each other by the constricted portions ⁇ s and are larger than the constricted portions ⁇ s.
- the notch 42 is formed between the plurality of main portions ⁇ m.
- the film F is damaged by heat or tension between the constricted portions ⁇ s at the time of fusion.
- the non-woven fabrics NW may be discontinuous non-woven fabrics instead of continuous non-woven fabrics.
- the non-woven fabric may be non-stretchable.
- the non-woven fabric may be a stretchable non-woven fabric or a crimped non-woven fabric. Accordingly, such changes and amendments are to be construed as being within the scope of the invention as defined by the claims.
- the telescopic laminated sheet of the present invention can be used as a part of a member such as a disposable wearable article.
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Abstract
Description
前記不織布NWと前記フィルムFとが互いに熱融着された複数の接合部1と、前記複数の接合部1の各接合部1は前記不織布NWおよび前記フィルムFが互いに熱融着された少なくとも1つの融着領域αを含み、
前記融着領域αを定義する少なくとも1つの境界ライン10と、
前記境界ライン10において、フィルムFの伸長状態において現れるフィルムFの第1開孔H1により定義され通気性を発揮する第1通気部11と、
前記融着領域αに隣接し前記境界ライン10により区画され前記フィルムFの一部が欠損した第2開孔H2により定義され、伸長状態および非伸長状態の双方において通気性を発揮する第2通気部12とを備える。
不織布が一対である場合、本発明の伸縮積層シートは、熱可塑性繊維を含み通気性を有する一対の不織布NWの間に、熱可塑性で、かつ、伸縮性を有するフィルムFが挟まれた伸縮積層シートであって、
前記一対の不織布NWと前記フィルムFとが互いに熱融着された複数の接合部1と、前記複数の接合部1の各接合部1は前記一対の不織布NWおよび前記フィルムFが互いに熱融着された少なくとも1つの融着領域αを含み、
前記融着領域αを定義する少なくとも1つの境界ライン10と、
前記境界ライン10において、フィルムFの伸長状態において現れるフィルムFの第1開孔H1により定義され通気性を発揮する第1通気部11と、
前記融着領域αに隣接し前記境界ライン10により区画され前記フィルムFの一部が欠損した第2開孔H2により定義され、伸長状態および非伸長状態の双方において通気性を発揮する第2通気部12とを備える。
前記伸縮積層シートにより形成され着用者の胴回り方向に延び着用者の胴を覆うように構成された胴回り部と、前記着用者の股間を覆うように構成された吸収性本体とを備える。
一方、伸長状態および非伸長状態(収縮状態)においては、フィルムFの一部が欠損した第2開孔H2および一対の不織布NWを通して、第2通気部12が通気性を発揮する。
したがって、伸長状態および非伸長状態のいずれの状態においても、従来よりも通気性が向上する。
前記不織布NWを張設しながら搬送する第1搬送工程と、
前記フィルムFを伸長状態で搬送する第2搬送工程と、
これらの搬送工程を行いながら前記不織布NWと前記フィルムFとを互いに重ねる工程と、
重ねた前記不織布NWおよび前記フィルムFを複数の接合部1において互いに熱融着する工程と、前記複数の接合部1の各接合部1は前記不織布NWと前記フィルムFとが互いに熱融着された少なくとも1つの融着領域αを含み、
前記融着領域αを定義する少なくとも1つの境界ライン10において、前記熱融着により前記伸長状態のフィルムFの一部が破断して、伸長状態において通気性を発揮する第1通気部11となる第1開孔H1を前記フィルムFに形成する工程と、
前記融着領域αに隣接し前記境界ライン10により区画されたフィルムFの一部が前記熱融着に伴い欠損することで、伸長状態および非伸長状態の双方において通気性を発揮する第2通気部12となる第2開孔H2を生成する工程とを備える。
前記一対の不織布NWを張設しながら搬送する搬送工程と、
前記フィルムFを伸長状態で搬送する搬送工程と、
これらの搬送工程を行いながら、前記一対の不織布NWの間に前記フィルムFが挟まれるように、これらを互いに重ねる工程と、
重ねた前記一対の不織布NWおよび前記フィルムFを複数の接合部1において互いに熱融着する工程と、前記複数の接合部1の各接合部1は前記一対の不織布NWと前記フィルムFとが互いに熱融着された少なくとも1つの融着領域αを含み、
前記融着領域αを定義する少なくとも1つの境界ライン10において、前記熱融着により前記伸長状態のフィルムFの一部が破断して、伸長状態において通気性を発揮する第1通気部11となる第1開孔H1を前記フィルムFに形成する工程と、
前記融着領域αに隣接し前記境界ライン10により区画されたフィルムFの一部が前記熱融着に伴い欠損することで、伸長状態および非伸長状態の双方において通気性を発揮する第2通気部12となる第2開孔H2を生成する工程とを備える。
なお、「熱融着により伸長状態のフィルムFの一部が破断して」とは、フィルムFの接合部1の周囲が熱融着時に破断する場合の他、熱融着後の再伸長時に破断する場合があることを意味する。
前記不織布NWおよび前記フィルムFを複数の接合部1において互いに熱融着するための複数の突部4を有するアンビルロールRと、
前記アンビルロールRと協働して前記突部4上の前記不織布NWおよびフィルムFを互いに熱融着する融着装置5とを備え、
前記複数の突部4の各突部4は、
前記接合部1における、熱融着される領域に対応する少なくとも1つの凸面βと、
前記少なくとも1つの凸面βを定義すると共にフィルムFの伸長状態において現われる前記フィルムFの第1開孔H1を形成するエッジライン40と、
前記エッジライン40により区画され前記凸面βが切り欠かれて前記フィルムFの一部を熱融着させて欠損した第2開孔H2を生成する切欠部42とを備える。
前記一対の不織布NWおよび前記フィルムFを複数の接合部1において互いに熱融着するための複数の突部4を有するアンビルロールRと、
前記アンビルロールRと協働して前記突部4上の前記不織布NWおよびフィルムFを互いに熱融着する融着装置5とを備え、
前記複数の突部4の各突部4は、
前記接合部1における、熱融着される領域に対応する少なくとも1つの凸面βと、
前記少なくとも1つの凸面βを定義すると共にフィルムFの伸長状態において現われる前記フィルムFの第1開孔H1を形成するエッジライン40と、
前記エッジライン40により区画され前記凸面βが切り欠かれて前記フィルムFの一部を熱融着させて欠損した第2開孔H2を生成する切欠部42とを備える。
図1A~図9Bは本発明の実施形態1を示す。
図2Aおよび図2Bは着用物品6を示す。
これらの図に示すように、着用物品6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Xに直交する縦方向Yに長い。着用物品は図2Aのオムツ型であってもよいし、図2Bのパンツ型であってもよい。
一方、第2通気部12は融着領域αに隣接し、境界ライン10により区画され、フィルムFの一部が欠損した第2開孔H2により定義され、図5Aの伸長状態および図7Aの非伸長状態の双方において通気性を発揮する。
図1Bにおいて、フィルムFは一対のニップロールR1,R2に挟まれて、これらの間からアンビルロールRに向かって供給される。一方、一対の不織布NWはフィルムFを挟むようにアンビルロールRに巻き付く。3枚に重なったシート状物NW,Fには超音波ホーン50から振動エネルギーが付与される。アンビルロールRの表面には図4の融着パターンに合致した形状や配置の突部4が図8Aのように形成されており、突部4において、シート状物NW,Fが互いに融着(シール)される。
図8Aに示すように、アンビルロールRには多数の突部4がアンビルロールRの周方向に間欠的に、かつ、アンビルロールRの軸方向Rsに間欠的に配置されている。これらの多数の突部4は接合部1(図4)に対応するように多数設けられている。なお、作図の都合上、図8Aの突部4は図3Aの胴回り部30の下縁部31の接合部1に対応するもののみを拡大して図示しており、図3Bの上縁部32に対応するものは図示していない。
なお、一部の第1開孔H1は熱融着後に、一旦、閉塞し、着用時等の再伸長時に、再度、フィルムFが破断して現れてもよい。なお、第1開孔H1は、溶着加工後に特表2000-513054に示されるような延伸加工を施すことにより現れてもよい。
この場合、2つの主部βm同士の間に前記切欠部42が形成されている。
複数の融着領域α同士の間に前記第2通気部12が形成されている。
複数の主部αm同士の間に前記第2通気部12が形成されている。
非伸長状態におけるフィルムFの永久ひずみが0%よりも大きく10%以下である。
複数の凸面β同士の間に前記切欠部42が形成されている。
複数の主部βm同士の間に前記切欠部42が形成されている。
たとえば、不織布NWの一方又は両方が連続不織布ではなく、不連続不織布であってもよい。また、不織布は非伸縮性であってもよい。また、不織布は伸縮不織布や捲縮不織布であってもよい。
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。
11:第1通気部 12:第2通気部
20:吸収性本体
30:胴回り部 31:下縁部 32:上縁部 33:中間部 34:重なり部
4:突部 40:エッジライン 42:切欠部
5:融着装置 50:超音波ホーン
6:着用物品
F:フィルム
NW:不織布
H:開孔 H1:第1開孔 H2:第2開孔 MD:搬送方向
R:アンビルロール R1,R2:ニップロール Rs:軸方向
S:伸縮積層シート
X:胴回り方向
Y:縦方向
W:幅
α:融着領域 αm:主部 αs:括れ部
β:凸面 βm:主部 βs:括れ部
Δ:距離
Claims (14)
- 熱可塑性繊維を含み通気性を有する少なくとも1枚の不織布NWに、熱可塑性で、かつ、伸縮性を有するフィルムFが積層された伸縮積層シートであって、
前記不織布NWと前記フィルムFとが互いに熱融着された複数の接合部1と、前記複数の接合部1の各接合部1は前記不織布NWおよび前記フィルムFが互いに熱融着された少なくとも1つの融着領域αを含み、
前記融着領域αを定義する少なくとも1つの境界ライン10と、
前記境界ライン10において、フィルムFの伸長状態において現れるフィルムFの第1開孔H1により定義され通気性を発揮する第1通気部11と、
前記融着領域αに隣接し前記境界ライン10により区画され前記フィルムFの一部が欠損した第2開孔H2により定義され、伸長状態および非伸長状態の双方において通気性を発揮する第2通気部12とを備える、伸縮積層シート。 - 請求項1において、前記少なくとも1枚の不織布NWは一対の不織布NWを含み、
前記フィルムFは前記一対の不織布NWの間に挟まれており、
前記複数の各接合部1の融着領域αは前記一対の不織布NWと前記フィルムFとが互いに熱融着されている、伸縮積層シート。 - 請求項1もしくは2において、前記複数の接合部1を構成する各接合部1は、互いに接近した複数の前記融着領域αを含み、
前記複数の融着領域α同士の間に前記第2通気部12が形成されている、伸縮積層シート。 - 請求項3において、前記互いに接近した複数の前記融着領域α同士の距離は、0mmよりも大きく3mm以下である、伸縮積層シート。
- 請求項1もしくは2において、前記融着領域αはくびれた括れ部αsと、前記括れ部αsにより互いに連なり、前記括れ部αsよりも大きい複数の主部αmとを含み、
前記複数の主部αm同士の間に前記第2通気部12が形成されている、伸縮積層シート。 - 請求項5において、前記複数の主部αm同士の距離は0mmよりも大きく3mm以下である、伸縮積層シート。
- 請求項1もしくは2の前記伸縮積層シートを含む使い捨て着用物品であって、
前記伸縮積層シートにより形成され着用者の胴回り方向に延び着用者の胴を覆うように構成された胴回り部と、前記着用者の股間を覆うように構成された吸収性本体とを備える、使い捨て着用物品。 - 熱可塑性繊維を含み通気性を有する少なくとも1枚の不織布NWに、熱可塑性で、かつ、伸縮性を有するフィルムFが積層された伸縮積層シートの製造方法であって、
前記不織布NWを張設しながら搬送する第1搬送工程と、
前記フィルムFを伸長状態で搬送する第2搬送工程と、
これらの搬送工程を行いながら前記不織布NWと前記フィルムFとを互いに重ねる工程と、
重ねた前記不織布NWおよび前記フィルムFを複数の接合部1において互いに熱融着する工程と、前記複数の接合部1の各接合部1は前記不織布NWと前記フィルムFとが互いに熱融着された少なくとも1つの融着領域αを含み、
前記融着領域αを定義する少なくとも1つの境界ライン10において、前記熱融着により前記伸長状態のフィルムFの一部が破断して、伸長状態において通気性を発揮する第1通気部11となる第1開孔H1を前記フィルムFに形成する工程と、
前記融着領域αに隣接し前記境界ライン10により区画されたフィルムFの一部が前記熱融着に伴い欠損することで、伸長状態および非伸長状態の双方において通気性を発揮する第2通気部12となる第2開孔H2を生成する工程とを備える、伸縮積層シートの製造方法。 - 請求項8において、前記少なくとも1枚の不織布NWは一対の不織布NWを含み、かつ、前記フィルムFが前記一対の不織布NWの間に挟まれた伸縮積層シートの製造方法であって、
前記第1搬送工程では前記一対の不織布NWを張設しながら搬送し、
前記重ねる工程では前記第1および第2搬送工程を行いながら、前記一対の不織布NWの間に前記フィルムFが挟まれるように、これらを互いに重ね、
前記熱融着する工程においては前記一対の不織布NWおよび前記フィルムFを前記複数の接合部1において互いに熱融着し、前記接合部1の前記融着領域αにおいては前記一対の不織布NWと前記フィルムFとが互いに熱融着される、伸縮積層シートの製造方法。 - 請求項8もしくは9において、
前記熱融着工程の後に、前記伸縮積層シートを伸長状態から非伸長状態にする工程を更に備え、
前記非伸長状態におけるフィルムFの永久ひずみが0%よりも大きく10%以下である、伸縮積層シートの製造方法。 - 熱可塑性繊維を含み通気性を有する少なくとも1枚の不織布NWの間に、熱可塑性で、かつ、伸縮性を有するフィルムFが積層された伸縮積層シートの製造装置であって、
前記不織布NWおよび前記フィルムFを複数の接合部1において互いに熱融着するための複数の突部4を有するアンビルロールRと、
前記アンビルロールRと協働して前記突部4上の前記不織布NWおよびフィルムFを互いに熱融着する融着装置5とを備え、
前記複数の突部4の各突部4は、
前記接合部1における、熱融着される領域に対応する少なくとも1つの凸面βと、
前記少なくとも1つの凸面βを定義すると共にフィルムFの伸長状態において現われる前記フィルムFの第1開孔H1を形成するエッジライン40と、
前記エッジライン40により区画され前記凸面βが切り欠かれて前記フィルムFの一部を熱融着させて欠損した第2開孔H2を生成する切欠部42とを備える、伸縮積層シートの製造装置。 - 請求項11において、前記少なくとも1枚の不織布NWは一対の不織布NWを含み、かつ、前記フィルムFが前記一対の不織布NWの間に挟まれた伸縮積層シートの製造装置であって、
前記アンビルロールRは前記一対の不織布NWおよび前記フィルムFを複数の接合部1において互いに熱融着するための複数の突部4を有するアンビルロールRである、伸縮積層シートの製造装置。 - 請求項11もしくは12において、前記各突部4は、互いに接近した複数の前記凸面βを含み、
前記複数の凸面β同士の間に前記切欠部42が形成されている、伸縮積層シートの製造装置。 - 請求項11もしくは12において、前記各凸面βはくびれた括れ部βsと、前記括れ部βsにより互いに連なり、前記括れ部βsよりも大きい複数の主部βmとを含み、
前記複数の主部βm同士の間に前記切欠部42が形成されている、伸縮積層シートの製造装置。
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US18/033,862 US20230414418A1 (en) | 2020-11-13 | 2021-10-08 | Stretch layered sheet, disposable wearing article, and method and device for manufacturing stretch layered sheet |
CN202180073395.6A CN116507486A (zh) | 2020-11-13 | 2021-10-08 | 伸缩层叠片材、一次性穿着物品、伸缩层叠片材的制造方法以及制造装置 |
KR1020237013829A KR20230074541A (ko) | 2020-11-13 | 2021-10-08 | 신축 적층 시트, 일회용 착용 물품, 신축 적층 시트의 제조 방법 및 제조 장치 |
EP21891552.8A EP4245516A4 (en) | 2020-11-13 | 2021-10-08 | STRETCHABLE LAYERED FILM, DISPOSABLE CLOTHING ARTICLES AND METHOD AND DEVICE FOR PRODUCING A STRETCHABLE LAYERED FILM |
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- 2021-10-08 US US18/033,862 patent/US20230414418A1/en active Pending
- 2021-10-08 CN CN202180073395.6A patent/CN116507486A/zh active Pending
- 2021-10-08 KR KR1020237013829A patent/KR20230074541A/ko unknown
- 2021-10-08 WO PCT/JP2021/037345 patent/WO2022102305A1/ja active Application Filing
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US20230414418A1 (en) | 2023-12-28 |
JP7092954B1 (ja) | 2022-06-28 |
CN116507486A (zh) | 2023-07-28 |
EP4245516A1 (en) | 2023-09-20 |
KR20230074541A (ko) | 2023-05-30 |
EP4245516A4 (en) | 2024-04-03 |
JPWO2022102305A1 (ja) | 2022-05-19 |
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