WO2013161983A1 - 複合シートおよび複合シートの製造方法 - Google Patents

複合シートおよび複合シートの製造方法 Download PDF

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Publication number
WO2013161983A1
WO2013161983A1 PCT/JP2013/062338 JP2013062338W WO2013161983A1 WO 2013161983 A1 WO2013161983 A1 WO 2013161983A1 JP 2013062338 W JP2013062338 W JP 2013062338W WO 2013161983 A1 WO2013161983 A1 WO 2013161983A1
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WO
WIPO (PCT)
Prior art keywords
elastic
composite sheet
layer
elastic layer
ridge
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/JP2013/062338
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
聡 光野
淳 奥田
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=49483280&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2013161983(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Unicharm Corp filed Critical Unicharm Corp
Priority to CN201380027291.7A priority Critical patent/CN104334341B/zh
Priority to US14/397,291 priority patent/US10052846B2/en
Priority to EP13782250.8A priority patent/EP2842734B2/en
Publication of WO2013161983A1 publication Critical patent/WO2013161983A1/ja
Anticipated expiration legal-status Critical
Priority to US15/884,943 priority patent/US10022936B2/en
Ceased legal-status Critical Current

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    • B32B2307/51—Elastic
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
    • Y10T428/2457—Parallel ribs and/or grooves

Definitions

  • the present invention relates to a composite sheet that can be used for wearing articles such as disposable diapers, disposable toilet training pants, disposable incontinence pants, disposable sanitary pants, disposable absorbent pads, and the like.
  • the present invention relates to a sheet manufacturing method.
  • Patent Document 1 discloses a disposable diaper using a composite sheet of an elastic sheet and an inelastic sheet.
  • This disposable diaper uses an elastic sheet for the skin facing surface and uses a non-elastic sheet for the non-skin facing surface.
  • a large number of wrinkles are formed on the inelastic sheet by joining the inelastic sheet in a state where the elastic sheet is extended.
  • By forming the bag a gap is formed between the diaper and the clothes, and good air permeability is realized.
  • Patent Document 2 discloses a method of manufacturing a composite sheet by joining a nonwoven fabric layer that is an inelastic sheet and an elastic base layer that is an elastic sheet to each other by an ultrasonic system including an anvil and a horn.
  • JP 2008-148834 A JP2008-148834A
  • JP-T 2008-526552 JP2008-526552A
  • the elastic sheet disclosed in Patent Document 1 the elastic sheet is flattened. When such a flat surface opposes the wearer's skin, the skin of the wearer is brought into close contact with the wearer's skin, resulting in a decrease in air permeability.
  • the method for producing a composite sheet disclosed in Patent Document 2 it is described that a coextruded elastic film is used as the elastic base layer, but the fiber nonwoven fabric having elasticity is not mentioned.
  • An object of the present invention is to provide a composite sheet having an elastic layer and an inelastic layer, which can improve air permeability, and a method for producing the composite sheet.
  • the present invention has a first invention and a second invention.
  • the first invention has a longitudinal direction and a transverse direction perpendicular thereto, and forms one surface and is elastically stretchable at least in the transverse direction, and an inelastic layer forming the other surface Is related to improvement of composite sheets joined together.
  • the elastic layer and the inelastic layer are bonded to each other by a large number of bonding portions that are spaced apart in the vertical direction and the horizontal direction, and the elastic layer is bonded to the bonding portion.
  • a first concave strip portion that overlaps and extends in the lateral direction; and a plurality of first convex strip portions that are adjacent to the first concave strip portion and extend in the lateral direction, and the inelastic layer is formed on the joint portion. It has the 2nd ridge part which extends in the longitudinal direction while overlapping, and a plurality of 2nd ridge parts which adjoin the 2nd ridge part and extend in the longitudinal direction.
  • a first groove that overlaps the joint and is formed in the elastic layer, and is adjacent to the first groove.
  • a composite sheet having a first ridge, a second ridge that overlaps with the joint and is formed in the inelastic layer, and a second ridge that extends in a direction intersecting the first ridge. It is related to the improvement of the manufacturing method.
  • a step of conveying an elastic web constituting the elastic layer by a first unwinding roll, a sonic horn through the nip roll, and an anvil facing the sonic horn A step of conveying to the ultrasonic device, a step of conveying the non-elastic web constituting the non-elastic layer to the ultrasonic device by a second unwinding roll, and the elastic web and the non-elastic web. Bonding with the ultrasonic device.
  • the peripheral surface of the anvil is provided with a large number of protrusions spaced apart in the rotational direction and the axial direction, and the elastic web is conveyed in contact with the peripheral surface, and the rotational speed of the anvil is determined by the nip roll. It is characterized by being made faster than the rotational speed of.
  • the elastic layer is formed with a first ridge and a first ridge extending in the lateral direction, and a second ridge extending in the longitudinal direction on the inelastic layer. Since a part and a 2nd groove part are formed, it can be set as a composite sheet with favorable air permeability in the plane direction.
  • the perspective view which looked at the composite sheet which concerns on this invention from the elastic layer side Comprising: The figure which fracture
  • FIG. 4 is an enlarged end view taken along line IV-IV in FIG. 2.
  • the enlarged view of the part enclosed with V of FIG. The perspective view of the disposable diaper which is an example of the disposable wearing article using a composite sheet. Explanatory drawing which shows the manufacturing process of a composite sheet. The enlarged view of the part enclosed by VIII of FIG.
  • the composite sheet 1 has a longitudinal direction Y and a transverse direction X orthogonal thereto, and an elastic layer 11 and an inelastic layer 12 are connected through a large number of interspersed joints 13. And bonded together.
  • the joint portion 13 can be formed, for example, by welding fibers using an ultrasonic device.
  • the elastic layer 11 includes elastic fibers.
  • the elastic layer 11 is formed of elastic fibers and non-elastic fibers, and is elastically stretchable in the lateral direction X. That is, the elastic layer 11 is made of a material having a residual strain of 30% or less, preferably 20% or less when the elastic layer 11 is stretched 100% in the lateral direction X and released from the stretched state. 1 and 2, the elastic layer 11 of the composite sheet 1 is released from the stretched state and contracted.
  • the elastic fiber and the non-elastic fiber may be mixed with each other to form an elastic layer, or each layer may be formed by these fibers and laminated to form an elastic layer. Also good.
  • the elastic fiber can be formed only of a thermoplastic elastomer, or can be formed by mixing a thermoplastic elastomer and another resin.
  • thermoplastic elastomer known ones such as polystyrene elastomers, polyolefin elastomers, polyurethane elastomers, polyamide elastomers can be used.
  • the form of the elastic fiber may be either a single fiber or a composite fiber, and a core-sheath type or a side-by-side type can be used as the composite fiber.
  • the inelastic fiber includes a thermoplastic resin, and particularly preferably includes a polyolefin resin, and may be either a single fiber of a polyolefin resin or a mixed fiber including a plurality of types of polyolefin resins. Moreover, any of a core-sheath fiber, a side-by-side fiber, or a single fiber may be used, and these fibers may be split fibers.
  • a polyolefin resin for example, polyethylene, polypropylene, ethylene- ⁇ olefin copolymer, and the like can be used.
  • the fiber diameter of the elastic fiber is about 5 to 100 ⁇ m, preferably about 10 to 40 ⁇ m, and the fiber diameter of the inelastic fiber is about 1 to 40 ⁇ m, preferably 10 to 30 ⁇ m. It is preferable to use one having a smaller fiber diameter.
  • fiber nonwoven fabrics by various production methods such as air-through fiber nonwoven fabric, point bond fiber nonwoven fabric (heat roll fiber nonwoven fabric), spunlace fiber nonwoven fabric, spunbond fiber nonwoven fabric, and meltblown fiber nonwoven fabric can be used.
  • fiber nonwoven fabric a woven fabric, a knitted fabric, a resin film, or the like can also be used.
  • the elastic layer 11 includes a plurality of first concave portions 14 that overlap with the joint portions 13 and extend in the lateral direction X, and are adjacent to the first concave portions 14 and laterally.
  • a large number of first ridges 15 extending in the direction X are formed.
  • the first ridge 15 is mainly raised by the fibers constituting the elastic layer 11.
  • the fibers in the first ridge 15 are bent or crimped (not shown), and the entire elastic layer 11 can be extended in the longitudinal direction Y and the transverse direction X by the extension of these fibers. In particular, in the lateral direction X, it can be elastically expanded and contracted.
  • the inelastic layer 12 includes a plurality of second concave portions 16 that overlap the joint portion 13 and extend in the longitudinal direction Y, and the longitudinal direction Y adjacent to the second concave portions 16. A large number of second ridges 17 extending to are formed.
  • the inelastic layer 12 is joined via the joint portion 13 in a state where the elastic layer 11 is stretched in the lateral direction X, and the second state extending in the longitudinal direction Y is released from the stretched state by releasing the stretched state. Concave portions 16 and second convex portions 17 are formed.
  • the elastic layer 11 and the non-elastic layer 12 are in contact with each other at the joint portion 13, and in the second convex portion 17, the non-elastic layer 12 is separated from the elastic layer 11, and these sheets A gap 18 is formed between them. Since the non-elastic layer 12 is substantially inelastic, that is, does not elastically expand and contract, when the stretched state is released by joining the stretched elastic layer 11, the non-elastic layer 12 is bonded to the joint 13. The second ridges 17 are formed.
  • a plurality of joints 13 are formed apart from each other in the horizontal direction X along a virtual line 19 extending in the horizontal direction X, and a plurality of virtual lines 19 are provided apart from each other in the vertical direction Y. It is done.
  • the respective joint portions 13 are arranged so as to draw a so-called staggered pattern so as not to overlap in the vertical direction Y.
  • the first ridge 15 extending in the lateral direction X along the virtual line 19 is formed.
  • a ridge that intersects the virtual line 19 is formed, and this ridge becomes the second ridge 17 that extends in the longitudinal direction Y.
  • the first ridge 15 of the elastic layer 11 extends in the lateral direction X
  • the second ridge 17 of the inelastic layer 12 extends in the longitudinal direction Y.
  • line part 17 cross
  • flexibility in the vertical direction Y and the horizontal direction X of the composite sheet 1 can be ensured.
  • both the first ridges 15 and the second ridges 17 extend in the vertical direction Y, it is easy to bend along the vertical direction Y, and it is difficult to bend along the horizontal direction X.
  • these ridges 15 and 17 extend in the intersecting direction, they can bend in both the longitudinal direction Y and the transverse direction X, and therefore can be flexibly bent in the entire composite sheet 1.
  • the mass of the composite sheet 1 is about 50 to 200 g / m 2 , preferably about 70 to 120 g / m 2 .
  • the mass was measured according to JIS L 1906 5.2.
  • the thickness of the composite sheet 1 is about 1.0 to 5.0 mm, preferably about 2.0 to 3.5 mm.
  • the thickness was measured using a THICKNESS GAUGE UF-60 manufactured by Daiei Kagaku Seiki Seisakusho Co., Ltd. In the measurement, a circular pressure plate was used, the pressure plate area was 20 cm 2 , and the measurement load was 0.3 kPa.
  • the composite sheet 1 Since the composite sheet 1 has the first ridges 15 formed on the elastic layer 11 and the second ridges 17 formed on the non-elastic layer 12, the thickness of the composite sheet 1 increases, and the bulky composite sheet 1 is obtained. be able to.
  • the first ridges 15 formed on the elastic layer 11 are mainly raised by fibers, they are not easily crushed by the pressure from the outside, and even if they are crushed, the bulk recovers when released from the pressure. Therefore, the composite sheet 1 which is bulky and has a good touch can be obtained.
  • the elongation ratio in the transverse direction X of the composite sheet 1 is about 1.0 to 4.0 times, preferably 1.2 to 3.2 times.
  • the stretching magnification is calculated by dividing the dimension in the lateral direction X in the stretched state of the sample to be measured by the dimension in the lateral direction X in the natural state.
  • the stretched state refers to a state in which the ridges of the inelastic layer 12 of the composite sheet 1 are extended and the second ridges 17 and the second ridges 16 are almost flattened, and the natural state is This refers to the state after the stretched state is released and left in an atmosphere of 20 ° C. and 60% RH for 60 minutes or longer.
  • the composite sheet 1 has a planar air permeability of about 60 to 120 m 3 / m 2 / min, preferably about 70 to 110 m 3 / m 2 / min.
  • the planar air permeability was measured using a KES-F8 air permeability tester manufactured by Kato Tech Co., Ltd.
  • the composite sheet 1 was cut into 100 mm ⁇ 100 mm as a sample, an air shielding plate was placed on the sample, and the air permeability was calculated from the airflow resistance value passing through the sample surface during supply and exhaust.
  • As the air shielding plate an acrylic plate adjusted to 0.3 g / cm 2 was used.
  • the composite sheet 1 as described above can be used for a disposable diaper 2 which is an example of a disposable wearing article.
  • the disposable diaper 2 has a longitudinal direction y and a lateral direction x orthogonal thereto, and is provided on the skin facing surface of the wearer and the non-skin facing surface on the opposite side, the chassis 21, and the skin facing surface of the chassis 21.
  • an absorbent structure 29 arranged.
  • the chassis 21 has a front waist region 22, a rear waist region 23, and a crotch region 24 positioned between the front and rear waist regions 22, 23. By joining both side portions 25 of the chassis 21 with seams that extend intermittently, the front and rear waist regions 22 and 23 are connected to form a waist opening and a leg opening.
  • the chassis 21 is located on the non-skin facing surface and connects the front and rear waist regions 26 and 27 and the front and rear waist regions 26 and 27, which define a part of the front and rear waist regions 22 and 23 and the crotch region 24. And a non-stretchable crotch sheet 28 that defines the crotch region 24.
  • Absorbing structures 29 are arranged inside the front and rear waist sheets 26 and 27 and the crotch sheet 28.
  • the absorbent structure 29 can be formed, for example, by covering a liquid-absorbent core made of a mixture of fluff pulp and superabsorbent polymer particles with a liquid-diffusible sheet (not shown).
  • the composite sheet 1 can be used as the front and rear waist sheets 26 and 27 as described above. In this embodiment, it arrange
  • the chassis 21 can be brought into close contact with the wearer at least in the front and rear waist regions 22 and 23.
  • line part 15 and the 1st recessed item part 14 are formed in the elastic layer 11 of the composite sheet 1, a clearance gap can be formed between a wearer's skin and air permeability can be ensured. .
  • the front and back waist seats 26 and 27 may adapt to a wearer's motion. Can prevent diaper shift.
  • the elastic layer 11 may be positioned on the non-skin facing surface. Even in that case, since creases are formed on both the skin facing surface and the non-skin facing surface of the diaper 2, good air permeability can be maintained.
  • the breathability can be ensured by using the composite sheet 1 for the front and rear waist sheets 26, 27 in the diaper 2, it is possible to prevent the diaper 2 from coming into close contact with the wearer's waist due to moisture such as sweat.
  • the waist sheet is in close contact with the waist, it is difficult to attach and detach the diaper 2, but this can be prevented in advance.
  • by ensuring air permeability it is possible to prevent stuffiness in the diaper 2 and prevent skin troubles such as a rash on the wearer's skin.
  • the composite sheet 1 as described above can be manufactured by the method shown in FIG.
  • the composite sheet 1 uses an elastic web 31 that forms the elastic layer 11, a non-elastic web 32 that forms the non-elastic layer 12, and a constituent material.
  • the elastic web 31 for example, a fiber nonwoven fabric using a continuous fiber of thermoplastic polyurethane elastomer as an elastic fiber and a continuous fiber of polypropylene as an inelastic fiber can be used.
  • the fiber diameter of the thermoplastic polyurethane elastomer is about 25 ⁇ m
  • the fiber diameter of polypropylene is about 21 ⁇ m
  • 47% (mass ratio) of the thermoplastic polyurethane elastomer is contained.
  • the elastic web 31 is conveyed from the first unwinding roll 33 at a speed of, for example, about 45.5 m / min.
  • the conveyed elastic web 31 is heated by a plurality of preheating rolls 34 and conveyed to a gear stretching device.
  • the preheating roll 34 is heated to about 80 ° C.
  • the gear stretching device includes a pair of first nip rolls 35 heated to about 80 ° C., a pair of gear rolls 36 and 37 heated to about 55 ° C., and a pair of second nip rolls 38.
  • the speed of the first nip roll 35 is about 45.5 m / min
  • the speed of the second nip roll 38 is about 54.5 m / min. That is, the elastic web 31 is stretched between the first and second nip rolls 35 and 38 and is passed between the gear rolls 36 and 37 while being stretched in the machine direction MD while being heated.
  • the stretched elastic web 31 is conveyed to the cooling conveyor 39 and cooled.
  • the conveyance speed in the cooling conveyor 39 is about 50.0 m / min.
  • the stretched elastic web 31 is conveyed to the ultrasonic device 40.
  • the ultrasonic device 40 includes a sonic horn 41 and a roll-shaped anvil 42.
  • a plurality of protrusions 43 are formed on the peripheral surface of the anvil 42 so as to draw a staggered pattern. Referring to FIG. 8, a large number of protrusions 43 are formed on the entire peripheral surface of the anvil 42, and have a diameter of about 0.8 mm and a height of about 1.0 mm.
  • the pitch P1 of the protrusions 43 adjacent to the rotation direction R is about 6.1 mm
  • the pitch P2 of the protrusions 43 adjacent to the axial direction S intersecting this is about 6.0 mm.
  • the pitch is a dimension from the center of one projection 43 to the center of the other projection 43.
  • the elastic web 31 is conveyed so as to be held in contact with the peripheral surface of the anvil 42.
  • the rotation speed of the anvil 42 is about 100 m / min.
  • a pair of third nip rolls 44 that convey the elastic web 31 are arranged upstream of the ultrasonic device 40, and a pair of fourth nip rolls 45 are arranged downstream.
  • the speed of the third nip roll 44 is about 54.5 m / min, and the speed of the fourth nip roll 45 is about 100 m / min.
  • the elastic web 31 is conveyed from the third nip roll 44 to the fourth nip roll 45 via the ultrasonic device 40, but due to the difference in rotational speed, the elastic web 31 is particularly separated between the third nip roll 44 and the anvil 42. And is conveyed while being stretched in the machine direction MD.
  • the elastic web 31 when the elastic web 31 is extended in the machine direction MD, the dimension in the direction crossing the machine direction MD is reduced, and a so-called width is formed, and a plurality of protrusions 43 are formed on the peripheral surface of the anvil 42. Therefore, the fibers of the elastic web 31 are caught by the protrusions 43 and the width can be suppressed.
  • the inelastic web 32 conveyed from the second unwinding roll 46 is laminated on the elastic web 31 conveyed while being in contact with the anvil 42.
  • a fiber nonwoven fabric containing a thermoplastic resin can be used for the non-elastic web 32.
  • a sheath-core type spunbond fiber nonwoven fabric using polypropylene / polyethylene copolymer for the sheath portion and polypropylene for the core portion is used.
  • the inelastic web 32 has a mass of about 28.4 g / m 2 and a thickness of about 0.31 mm.
  • the speed of the second unwinding roll 46 is about 100 m / min.
  • the joined portion 13 is formed by the sonic horn 41 and the anvil 42 in the laminated elastic web 31 and inelastic web 32. That is, the thermoplastic synthetic resin of the elastic web 31 and the non-elastic web 32 is welded by ultrasonic waves and joined together.
  • the sonic horn 41 is set to a frequency of about 20 KHz and a pressure of 300 N / 160 mm.
  • the stretched state of the elastic web 31 is released.
  • the elastic web 31 contracts in the machine direction MD, so that the non-elastic web 32 bends between the joints 13 to form wrinkles, which cross the machine direction MD.
  • a second ridge 17 extending in the direction is formed. Since the non-elastic web 32 is joined to the elastic web 31 at the portion where the joint portion 13 is formed, this becomes the second concave portion 16 (see FIGS. 2 and 4).
  • the stretched state of the elastic web 31 When the stretched state of the elastic web 31 is released, the state of entering the width in the crossing direction is also released, so that the dimension in the crossing direction increases. That is, the fibers constituting the elastic web 31 extend randomly in the machine direction MD and the crossing direction before being stretched in the machine direction MD, but are stretched between the third and fourth nip rolls 44 and 45. So as to extend along the machine direction MD. As a result, the elastic web 31 extends in the machine direction MD and decreases its size in the crossing direction. When this stretched state is released, at least a part of the fibers oriented in the machine direction MD will return to the original state, and a part of the stretched fibers will rise in the thickness direction. , Made bulky.
  • the portion that rises and becomes bulky becomes the first ridge portion 15, and does not become bulky in the portion where the joint portion 13 is formed, so that it becomes the first ridge portion 14 (see FIGS. 1, 3, and 5).
  • the fibers in the first ridge portion 15 become sparse and the planar air permeability can be further improved. it can.
  • Table 1 shows another example of the composite sheet 1 manufactured in the apparatus as described above.
  • Example 1 is a composite sheet 1 manufactured under the above conditions, and Examples 2 to 6 show cases where each setting of the manufacturing apparatus is changed from the setting in Example 1, and the elastic web 31 in each case The characteristic and the characteristic of the manufactured composite sheet 1 are shown.
  • the expansion ratio in the table corresponds to the expansion ratio in paragraph 0024 of the above specification.
  • the elastic web 31 and the non-elastic web 32 were joined with a hot melt adhesive instead of joining with an ultrasonic device.
  • the hot-melt adhesive a polystyrene-based elastomer-containing hot melt was used and applied to the non-elastic web 32 by a curtain type coating machine with a nozzle pitch of 5 mm and a mass of 2 g / m 2 .
  • the comparative example it manufactured with the apparatus setting similar to Example 1.
  • FIG. It can be inferred that the composite sheet of the comparative example has lower planar air permeability than the composite sheet of the example, and the first and second ridges are not formed.
  • the bonding strength between the elastic web 31 and the non-elastic web 32 was smaller than that of the example, and was about 40% of that of the example 1.
  • the stretched elastic web 31 is noticeably included in the width.
  • both sides of the elastic web 31 are particularly thick, and the thickness unevenness with the inside increases.
  • the joining strength tends to decrease when the thickness is increased, and the strength tends to increase when the thickness is thin. Therefore, there is a possibility that the bonding strength at the time of forming the bonding portion may vary.
  • the protrusion 43 can be formed in the anvil 42 and a width
  • the elastic web 31 needs to have a certain width. Accordingly, the protrusions 43 provided on the anvil 42 do not completely prevent the elastic web 31 from entering the width, but the first protrusion 15 is formed and the variation in the bonding strength of the bonding portion is suppressed. To control.
  • the joining portion 13 is formed by the ultrasonic device 40, but can also be formed by heat sealing by embossing or the like.
  • the entire elastic web or non-elastic web is heated when the joint is formed, so that the sheet is easily damaged by heat and is not easily bulky.
  • the protrusion 43 of the ultrasonic device 40 is circular, but is not limited to this, and may be a diamond, ellipse, rectangle, etc., and its cross-sectional area is about 0.1 to 10 mm 2 is preferable.
  • the cross-sectional area is 0.1 mm 2 or less, the bonded area is reduced, and the elastic layer 11 and the non-elastic layer 12 of the composite sheet 1 are easily separated.
  • the cross-sectional area is 10 mm 2 or more, when the joint portion is formed into a film, the area becomes large and the touch becomes worse.
  • the pitches P1 and P2 of the protrusions 43 are preferably about 1 to 20 mm, and if it is 1 mm or less, the second protrusions 17 of the inelastic layer 12 are difficult to be formed, and if it is 20 mm or more, the thickness of the composite sheet 1 becomes too large. there is a possibility.
  • the height of the protrusion 43 can be about 0.1 to 2.0 mm, preferably about 0.2 to 1.0 mm. Usually, the thickness of the fiber nonwoven fabric is often 0.3 to 2.0 mm, so that the joining portion 13 is surely formed on the fiber nonwoven fabric.
  • the protrusions 43 have a staggered pattern, but are not limited thereto. However, in order to control the width of the elastic web 31 in the crossing direction, it is desirable that a plurality of protrusions 43 be provided apart from each other in the rotation direction of the anvil 42.
  • the elastic web 31 is gear stretched, but this is not an essential configuration.
  • non-elastic fibers can be stretched by gear-stretching the elastic web 31 including elastic fibers and non-elastic fibers, and the Young's modulus is reduced when the elastic web 31 (elastic layer 11) is stretched.
  • the gear rolls 36 and 37 have a gear pitch of about 1 to 10 mm, preferably about 2 to 6 mm. If the gear pitch is 1 mm or less, the gear teeth need to be thinned, and the web may be cut by the teeth. If the gear pitch is 10 mm or more, the draw ratio may be low and the stretchability may be insufficient. .
  • the gear biting depth can be about 0.5 mm or more, and if it is smaller than this, the web may be stretched insufficiently.
  • the stretch ratio of the web before and after the stretching process can be about 30 to 400%, preferably about 50 to 200%. If the draw ratio is 30% or less, the web is not sufficiently stretched, and if it is 400% or more, the fibers of the stretched web are cut and easily fall off.
  • the disclosure relating to the present invention described above can be summarized at least in the following matters.
  • the composite sheet 1 according to the first invention has a longitudinal direction Y and a transverse direction X orthogonal thereto, forms one surface and elastically expands and contracts at least in the transverse direction, and the other
  • the inelastic layer 12 forming the surface is bonded to each other.
  • the first invention is characterized in that the composite sheet 1 includes the following points.
  • the elastic layer 11 and the inelastic layer 12 are joined to each other by a large number of joints 13 that are spaced apart in the longitudinal direction Y and the transverse direction X, respectively.
  • the elastic layer 11 overlaps the joint portion 13 and extends in the lateral direction X, and a plurality of first protrusions adjacent to the first recess 14 and extending in the lateral direction X.
  • the inelastic layer 12 overlaps the joint portion 13 and extends in the longitudinal direction Y, and a plurality of second ridges adjacent to the second recess 16 and extending in the longitudinal direction Y. Part 17.
  • the first invention described above can include at least the following embodiments.
  • the elastic layer 11 and the non-elastic layer 12 are each formed of a fiber nonwoven fabric containing a thermoplastic resin, and the elastic layer 11 and the non-elastic layer 12 are welded at the joint portion 13.
  • the elastic layer 11 includes elastic fibers and non-elastic fibers.
  • the inelastic layer 12 is separated from the elastic layer 11 in the second ridge portion 17 to form a gap 18.
  • At least a part of the elastic layer 11 is in contact with the inelastic layer 12 in the first ridge 15.
  • the joint portions 13 are provided separately along the virtual line 19 extending in the horizontal direction X, and a plurality of the virtual lines 19 are arranged separately in the horizontal direction X, and the adjacent virtual lines
  • the joints 13 in 19 have a positional relationship that does not overlap each other in the longitudinal direction Y.
  • At least one of the front and rear waist regions of a wearing article including a wearer's skin facing surface and a non-skin facing surface that is the opposite side of the wearer, and a chassis 21 having a front and rear waist region 22 and a crotch region 24, It is formed from a composite sheet.
  • the method for manufacturing the composite sheet 1 according to the second invention includes a large number of joints 13 for joining the elastic layer 11 and the non-elastic layer 12, and first concaves that overlap the joints 13 and are formed in the elastic layer 11.
  • the second invention is characterized in that the method for manufacturing the composite sheet 1 includes the following points. Conveying the elastic web 31 constituting the elastic layer 11 by a first unwinding roll 33; Conveying the elastic web 31 to the ultrasonic device 40 having a sonic horn 41 and an anvil 42 facing the sonic horn 41 via a nip roll 44; Conveying the inelastic web 32 constituting the inelastic layer 12 to the ultrasonic device 40 by a second unwinding roll 46; Joining the elastic web 31 and the non-elastic web 32 by the ultrasonic device 40; The circumferential surface of the anvil 42 is provided with a large number of protrusions 43 that are spaced apart in the rotational direction and the axial direction. The elastic web 31 is conveyed in contact with the circumferential surface, and the rotational speed of the anvil 42 is Is made faster than the rotational speed of the nip roll 44.
  • the second invention described above can include at least the following embodiments.
  • the elastic web 31 is stretched in the machine direction MD between the anvil 42 and the nip roll 44, and in a cross direction perpendicular to the machine direction MD after stretching than before stretching. Dimensions are reduced.
  • the elastic web 31 further includes a step of being stretched by a pair of gear rolls 36 and 37, and the joining portion 13 is formed in the stretched elastic web 31.

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  • Heart & Thoracic Surgery (AREA)
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PCT/JP2013/062338 2012-04-27 2013-04-26 複合シートおよび複合シートの製造方法 Ceased WO2013161983A1 (ja)

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CN201380027291.7A CN104334341B (zh) 2012-04-27 2013-04-26 复合片及复合片的制造方法
US14/397,291 US10052846B2 (en) 2012-04-27 2013-04-26 Composite sheet and method for manufacturing the same
EP13782250.8A EP2842734B2 (en) 2012-04-27 2013-04-26 Composite sheet and method for manufacturing composite sheet
US15/884,943 US10022936B2 (en) 2012-04-27 2018-01-31 Composite sheet and method for manufacturing the same

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CN104334341B (zh) 2017-06-30
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JP2013231249A (ja) 2013-11-14
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US20180154607A1 (en) 2018-06-07
JP5783951B2 (ja) 2015-09-24
EP2842734B2 (en) 2019-11-27
US10022936B2 (en) 2018-07-17
US10052846B2 (en) 2018-08-21
US20150147530A1 (en) 2015-05-28
EP2842734B1 (en) 2017-01-04

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