WO2018185677A1 - Matériau de base d'ailette de couche ayant un élément de fixation et de multiples plis - Google Patents
Matériau de base d'ailette de couche ayant un élément de fixation et de multiples plis Download PDFInfo
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- WO2018185677A1 WO2018185677A1 PCT/IB2018/052325 IB2018052325W WO2018185677A1 WO 2018185677 A1 WO2018185677 A1 WO 2018185677A1 IB 2018052325 W IB2018052325 W IB 2018052325W WO 2018185677 A1 WO2018185677 A1 WO 2018185677A1
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- Prior art keywords
- hemisphere
- carrier
- hook
- fold
- web
- Prior art date
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Classifications
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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
- A61F13/56—Supporting or fastening means
- A61F13/62—Mechanical fastening means, ; Fabric strip fastener elements, e.g. hook and loop
- A61F13/622—Fabric strip fastener elements, e.g. hook and loop
- A61F13/625—Fabric strip fastener elements, e.g. hook and loop characterised by the hook
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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
- A61F13/56—Supporting or fastening means
- A61F13/62—Mechanical fastening means, ; Fabric strip fastener elements, e.g. hook and loop
- A61F13/622—Fabric strip fastener elements, e.g. hook and loop
Definitions
- absorbent articles intended for personal wear such as diapers, training pants, feminine hygiene products, adult incontinence products, bandages, medical garments and the like are designed to be sufficiently absorbent to absorb moisture from liquid body exudates including urine, menses, blood, etc., away from the wearer to reduce skin irritation caused by prolonged wetness exposure.
- Diapers as an example, are typically placed and secured on a wearer using a set of primary fastening tabs, or "ears" that extend laterally from the rear of the diaper, and include a fastening component such as adhesive tabs or a mechanical (e.g., hook or loop) system, and left in place to absorb insults as well as to contain fecal waste.
- the stock material used by the diaper manufacturer, from which ear subassembly is cut typically includes one or more strips of hook-type material centrally oriented on carrier.
- a feedstock material for conversion into diaper ear subassemblies designed for improving stability when put in roll format includes symmetric folds running down-web, configured in such a way as to allow denser packing of the feedstock material.
- the feedstock material includes a carrier and, coupled thereto, at least one strip of hook- type material.
- the roll of feedstock material is shipped to a diaper manufacturer where it is unrolled and cut into ear subassemblies, which are then coupled to diaper chassis.
- the hook-type material on either of the two ears thereby comprises a fastening component for the finished diaper, and may mate with a suitably receptive surface on the outer front surface of the diaper chassis (such as a loop-type material).
- the pre-combined ear stock material of the present disclosure is manufactured, in one embodiment, by coupling to a web carrier one or more strips of hook-type material. The web is then continuously folded by pulling the web through a folding tool. In another embodiment, the carrier web is folded before the one or more strips of hook-type material is coupled to the web carrier.
- Figure 1 is a drawing of a diaper in plain view.
- Figure 2 is a drawing of a manufacturing process for pre-combined ear stock material.
- Figure 2A is a view of the cross section of the embodiment shown in Figure 2 at 2a.
- Figure 3 is a drawing of a manufacturing process that uses pre-combined ear stock material.
- Figure 4 is a plan view of a manufacturing process for folded pre-combined ear stock material.
- Figure 4 A is a view of the cross section of the embodiment shown in Figure 4 at 4a.
- Figure 4B is a view of the cross section of the embodiment shown in Figure 4 at 4b.
- Figure 4C is a view of the cross section of the embodiment shown in Figure 4 at 4c.
- Figure 5 is a profile view of a fold pattern for a folded pre-combined ear stock material.
- Figure 6 is a profile view of a fold pattern for a folded pre-combined ear stock material.
- Figure 7 is a profile view of a fold pattern for a folded pre-combined ear stock material.
- Figure 8 is a profile view of a fold pattern for a folded pre-combined ear stock material.
- Figure 9 is a profile view of a fold pattern for a folded pre-combined ear stock material.
- Figure 10 is a profile view of a fold pattern for a folded pre-combined ear stock material.
- the present disclosure relates generally to absorbent articles intended for personal wear, and more particularly to disposable absorbent articles having a fastening tab system for selectively fastening and refastening the article about the wearer wherein the fastening system is made from an "ear" subassembly.
- Figure 1 illustrates a known diaper, indicated generally at 10, that includes two such ear subassemblies extending laterally from the diaper.
- Figure 1 depicts the diaper 10 in an unfolded and laid flat condition to show an outer cover 32 of the diaper which would form the outer surface of the diaper when worn.
- the diaper 10 has a longitudinal direction 12 and a lateral direction 14. In the longitudinal direction 12, the diaper 10 defines a front portion 16, a back portion 18, and a crotch portion 20 extending between and connecting the front portion and the back portion.
- Diaper 10 also includes a bodyside liner 30 (facing away from the view depicted in Figure 1), and an absorbent core 34 located between the bodyside liner and the outer cover 32.
- the diaper 10 has opposite longitudinal side edges 28 that extend between a back waist edge 38 and a front waist edge 40.
- Diaper 10 also includes a pair of longitudinally-extending leg cuffs 36.
- Leg cuffs 36 may be adapted to fit about the legs of a wearer in use and serve as a mechanical barrier to the lateral flow of body exudates.
- the back portion 18 of the diaper 10 includes a pair of ears, indicated generally at 22.
- Each ear 22 includes a primary fastening component 24 coupled to backing 78.
- the primary fastening system is used to secure the diaper 10 around the waist of a wearer.
- the fastening component may comprise a pressure sensitive adhesive or a hook-type material, for example.
- the diaper's front portion 16 would include an outer cover 32 suitably selected to form a receptive fastening component to the fastening component of the ear (fastening component 24 in this case).
- fastening component 24 comprises a hook-type material
- the diaper's front portion 16 might comprise a nonwoven material selected to suitably engage with and couple to the selected hook-type material.
- each ear 22 is typically converted (i.e., die-cut) and coupled to the diaper chassis at the time of diaper assembly.
- the diaper manufacturer purchases carrier material and fastening component material (ie, hook), then undertakes the task of bonding these two materials together in the process of making the ear sub-assembly.
- the manufacturer may avoid these additional assembly steps by buying rolls of ear stock material that have the fastening component already included thereon (called pre-combined ear stock material).
- the ear sub-assembly is in such cases cut from the roll of ear stock material, such that the manufacturer need only cut the ear in the desired shape, then couple it to the diaper chassis (that is, the steps associated with coupling the fastening component to a backing is avoided).
- rolls of ear stock material are received by the manufacturer, stored in inventory until needed, then processed as part of the diaper manufacturing process.
- pre-combined ear stock material is a known format that diaper
- the hook is laminated to a carrier (typically a nonwoven) in a separate step (offline lamination step) and the resultant carrier wound into a roll, which is then then transported to the diaper manufacturer to be unwound, cut into ear sub-assembly pieces, the pieces then applied to the diaper.
- a carrier typically a nonwoven
- offline lamination step offline lamination step
- FIG. 2 shows rolling operation 50.
- a web of pre-combined ear stock material is wound onto roll 56 by the manufacturer of the pre-combined ear stock material.
- the web includes a strip of hook-type material 58 (two centrally oriented strips are also known in the art) oriented along the central down-web axis of the web of material, and includes carrier section 54 and 54' .
- a cross section of the roll at perspective 2a is also shown in Figure 2a.
- the hook sections 58 stack upon one another, creating a thick, dense section in the roll, but carrier areas 54 and 54' are not densely packed on the roll.
- Figure 3 is a representation of the process by which a diaper manufacturer, for example, might unwind roll 56 and S-cut the roll of pre-combined ear stock material along dashed line 52, creating ear subassemblies for later coupling to a diaper chassis.
- rolls of pre-combined ear stock material may be stable at a relatively small roll diameter, but less stable at larger diameters.
- the rolls of the prior art may not be amenable to high stacking, as would be desired for example on a pallet of rolls used for shipping or placed in inventory.
- the pre-combined hook laminate roll is made, it is placed flat on a pallet and rolls are stacked on the pallet and ultimately shipped to a customer. As more and more rolls get stacked on each other, the bottom rolls get compressed and deformed due to the loose edges of the laminate of constructions of the prior art in some embodiments.
- Rolls of pre-combined ear stock material of the prior art mostly comprise less dense air and are not altogether very dense or stable under compressive loads.
- a pre-combined hook roll When a pre-combined hook roll is to be used in a manufacturing environment, an operator will pick up the roll and place it onto an unwind spindle for cutting and converting in preparation for coupling to a diaper chassis. If the roll is not very stable, it will be easy for the roll to telescope during manipulation or unwinding.
- Embodiments in this disclosure improve upon all or some of these problems of the prior art.
- Figure 4 shows a novel roll of pre-combined ear stock material.
- Figure 4 shows pre- combined ear stock material roll operation 59.
- a web of pre-combined ear stock material includes carrier 61 and strips of hook-type material 62 and 62' .
- the hook type material is typically laminated or otherwise adhered to the carrier in a previous step, though other methods, including integrally forming the hook-type material on the carrier, are possible. Though two strips of hook-type material are shown in Figure 4, one strip or more than two strips are also possible.
- the carrier material could comprise fibrous material (e.g., a woven, nonwoven, or knit material). In some embodiments, the either layer comprises a nonwoven.
- nonwoven when referring to a tab chassis or web means having a structure of individual fibers or threads which are interlaid, but not in an identifiable manner as in a knitted fabric.
- Nonwoven fabrics or webs can be formed from various processes such as meltblowing processes, spunbonding processes, spunlacing processes, and bonded carded web processes.
- the tab chassis comprises multiple layers of nonwoven materials with, for example, at least one layer of a meltblown nonwoven and at least one layer of a spunbonded nonwoven, or any other suitable combination of nonwoven materials.
- either layer or both layers of the tab chassis may comprise a spunbond-meltbond-spunbond, spunbond-spunbond, or spunbond- spunbond- spunbond multilayer material.
- the layers in the tab chassis may be a composite web comprising a nonwoven layer and a dense film layer (e.g., a thermoplastic film layer).
- the carrier may comprise an integrally formed hook into a nonwoven material, as described for example in US Patent 5,744,080 (Kennedy et. al.).
- Fibrous materials that can provide useful layers of the carrier may be made of natural fibers (e.g., wood or cotton fibers), synthetic fibers (e.g., thermoplastic fibers), or a combination of natural and synthetic fibers.
- natural fibers e.g., wood or cotton fibers
- synthetic fibers e.g., thermoplastic fibers
- thermoplastic fibers include polyolefins (e.g., polyethylene, polypropylene, polybutylene, ethylene copolymers, propylene copolymers, butylene copolymers, and copolymers and blends of these polymers), polyesters, and polyamides.
- the fibers may also be multi- component fibers, for example, having a core of one thermoplastic material and a sheath of another thermoplastic material.
- one or more zones of the tab chassis may comprise one or more elastically extensible materials extending in at least one direction when a force is applied and returning to approximately their original dimension after the force is removed.
- the portions of the tab chassis joined to the fastening patch is not stretchable or has up to a 10 (in some embodiments, up to 9, 8, 7, 6, or 5) percent elongation in the CD.
- the layers that comprise the tab chassis may be extensible but nonelastic.
- the tab chassis may have an elongation of at least 5, 10, 15, 20, 25, 30, 40, or 50 percent but substantially no recovery from the elongation (e.g., up to 10 or 5 percent recovery).
- Suitable extensible tab chassis material may include nonwovens (e.g., spunbond, meltblown, spunbond meltblown, or carded nonwovens).
- the nonwoven may be a high elongation carded nonwoven (e.g., HEC).
- Useful layers used in the carrier may have any suitable basis weight or thickness that is desired for a particular application.
- the basis weight may range, e.g., from at least about 5, 8, 10, 20, 30, or 40 grams per square meter, up to about 400, 200, 100, or 50 grams per square meter.
- the tab chassis may be up to about 5 mm, about 2 mm, or about 1 mm in thickness and/or at least about 0.1, about 0.2, or about 0.5 mm in thickness.
- the carrier has a high aspect ratio, meaning its length down web (also referred to as longitudinal dimension) far exceeds its cross-web width (also referred to as the latitudinal dimension).
- the strips of hook-type material 62 and 62' upstanding male fastening elements on a backing are referred to herein as "hook type" but this terminology is used only in a general sense and is not intended to limit the design of the male elements; male elements may not actually include an actual hook-shape (for example they may be mushroom shaped or have other shapes).
- the male elements generally have a form that may be suitably loop engaging with a loop type material present in landing zone area of a diaper (the area where the hook-type material fastenably engages with the diaper chassis, by way of a user bringing the fastening components of the two substrates in contact with one another).
- the male fastening elements are typically integral with a backing layer (that is, formed at the same time as a unit, unitary).
- Hook-type fastening patches are typically made from at least one thermoplastic material.
- Suitable thermoplastic materials for mechanical fasteners include polyolefin homopolymers such as polyethylene and polypropylene, copolymers of ethylene, propylene and/or butylene; copolymers containing ethylene such as ethylene vinyl acetate and ethylene acrylic acid; polyesters such as poly(ethylene terephthalate), polyethylene butyrate and polyethylene napthalate;
- the thermoplastic is a polyolefin (e.g., polyethylene, polypropylene, polybutylene, ethylene copolymers, propylene copolymers, butylene copolymers, and copolymers and blends of these materials).
- Upstanding male fastening elements on a backing can be made, for example, by feeding a thermoplastic material onto a continuously moving mold surface with cavities having the inverse shape of the posts.
- the thermoplastic material can be passed between a nip formed by two rolls or a nip between a die face and roll surface, with at least one of the rolls having the cavities.
- the cavities may be in the inverse shape of a capped post having a loop-engaging head or may be in the inverse shape of a post without loop-engaging heads (e.g., a precursor to a male fastening element).
- Pressure provided by the nip forces the resin into the cavities.
- a vacuum can be used to evacuate the cavities for easier filling of the cavities.
- the nip typically has a large enough gap such that a coherent backing is formed over the cavities.
- the mold surface and cavities can optionally be air or water cooled before stripping the integrally formed backing and upstanding hook elements from the mold surface such as by a stripper roll. If the posts formed upon exiting the cavities do not have loop-engaging heads, loop-engaging heads could be subsequently formed into hooks by a capping method as described in U.S. Pat. No. 5,077,870 (Melbye et. al.). Typically, the capping method includes deforming the tip portions of the hook elements using heat and/or pressure. The heat and pressure, if both are used, could be applied sequentially or simultaneously.
- Suitable tool rolls include those formed from a series of plates defining a plurality of post- forming cavities about its periphery such as those described, for example, in U.S. Pat. No. 4,775,310 (Fischer). Cavities may be formed in the plates by drilling or photoresist technology, for example. Other suitable tool rolls may include wire-wrapped rolls, which are disclosed along with their method of manufacturing, for example, in U.S. Pat. No. 6,190,594 (Gorman et al.).
- Another exemplary method for forming a thermoplastic backing with upstanding posts includes using a flexible mold belt defining an array of upstanding post-shaped cavities as described in U.S. Pat. No. 7,214,334 (Jens et al.).
- thermoplastic backing with upstanding posts can be found in U.S. Pat. No. 6,287,665 (Hammer), U.S. Pat. No. 7, 198,743 (Tuma), and U.S. Pat. No. 6,627, 133 (Tuma).
- thermoplastic flow stream is passed through a patterned die lip (e.g., cut by electron discharge machining) to form a web having downweb ridges.
- the ridges can then be transversely sliced at spaced locations along the extension of the ridges to form upstanding fastening elements with a small separation caused by the cutting blade.
- the separation between upstanding fastening elements is then increased by stretching.
- the male fastening elements on the fastening patch of the laminate typically have loop- engaging heads that have an overhang.
- the term "loop-engaging" as used herein relates to the ability of a male fastening element to be mechanically attached to a loop material.
- Suitable male fastening elements with loop-engaging heads can have any desired shape.
- the male fastening element may be in the shape of a mushroom (e.g., with a circular or oval head enlarged with respect to the stem), a hook, a palm-tree, a nail, a T, or a J.
- the loop-engageability of male fastening elements may be determined and defined by using standard woven, nonwoven, or knit materials.
- a region of male fastening elements with loop-engaging heads generally will provide, in combination with a loop material, at least one of a higher peel strength, higher dynamic shear strength, or higher dynamic friction than a region of posts without loop-engaging heads.
- male fastening elements that have loop-engaging heads have a maximum thickness dimension (in either dimension normal to the height) of up to about 1 (in some embodiments, 0.9, 0.8, 0.7, 0.6, 0.5, or 0.45) millimeter.
- the male fastening elements on can have a variety of useful maximum heights (above the backing) of up to 3 mm, 1.5 mm, 1 mm, or 0.5 mm and, in some embodiments a minimum height of at least 0.05 mm, 0.1 mm, or 0.2 mm.
- the upstanding posts have a variety of aspect ratios (that is, a ratio of height to width at the widest point) such as at least about 2: 1, 3 : 1, or 4: 1.
- a variety of densities of the upstanding fastening elements may be useful.
- the male fastening elements have a density of at least 248 per square centimeter (cm2) (1600 per square inch, in2) and up to about
- the density of the male fastening elements may be in a range from 271/cm2 (1750/in2) to about 852/cm2 (5500/in2) or from 248/cm2 (1600/in2) to 542/cm2 (3500/in2).
- the spacing of the male fastening elements need not be uniform.
- Fastening components suitable for embodiments described herein may include laminates.
- the fastening patch (backing plus male members) may be joined to a carrier, for example, by lamination (e.g., extrusion lamination), adhesives (e.g., pressure sensitive adhesives, hot melt adhesives, or structural adhesives), or other bonding methods (e.g., ultrasonic bonding, thermal bonding, compression bonding, or surface bonding).
- lamination e.g., extrusion lamination
- adhesives e.g., pressure sensitive adhesives, hot melt adhesives, or structural adhesives
- other bonding methods e.g., ultrasonic bonding, thermal bonding, compression bonding, or surface bonding.
- the fastening component is joined to a carrier using surface bonding or loft-retaining bonding techniques.
- surface-bonded when referring to the bonding of fibrous materials means that parts of fiber surfaces of at least portions of fibers are melt-bonded to the backing of the fastening patch, on a side opposite the male fastening elements, in such a manner as to substantially preserve the original (pre-bonded) shape of the surface of the backing and to substantially preserve at least some portions of the surface of the backing in an exposed condition in the surface-bonded area.
- surface-bonded fibers may be distinguished from embedded fibers in that at least about 65 percent of the surface area of the surface-bonded fiber is visible above the surface of the backing in the bonded portion of the fiber. Inspection from more than one angle may be necessary to visualize the entirety of the surface area of the fiber.
- the term "loft-retaining bond" when referring to the bonding of fibrous materials means a bonded fibrous material comprises a loft that is at least 80 percent of the loft exhibited by the material prior to, or in the absence of, the bonding process.
- the loft of a fibrous material as used herein is the ratio of the total volume occupied by the web (including fibers as well as interstitial spaces of the material that are not occupied by fibers) to the volume occupied by the material of the fibers alone. If only a portion of a fibrous web has the surface of the backing bonded thereto, the retained loft can be easily ascertained by comparing the loft of the fibrous web in the bonded area to that of the web in an unbonded area. It may be convenient in some circumstances to compare the loft of the bonded web to that of a sample of the same web before being bonded.
- joining the fastening patch to a fibrous carrier comprises impinging heated gaseous fluid (e.g., ambient air, dehumidified air, nitrogen, an inert gas, or other gas mixture) onto a first surface of the fibrous web carrier while it is moving; impinging heated fluid onto the second surface of the backing while the continuous web is moving, wherein the second surface is opposite the male fastening elements; and contacting the first surface of the fibrous web with the second surface of the backing so that the first surface of the fibrous web is melt-bonded (e.g., surface-bonded or bonded with a loft-retaining bond) to the second surface of the backing.
- heated gaseous fluid e.g., ambient air, dehumidified air, nitrogen, an inert gas, or other gas mixture
- Impinging heated gaseous fluid onto the first surface of the fibrous web and impinging heated gaseous fluid on the second surface of the backing may be carried out sequentially or simultaneously. Further methods and apparatus for joining a continuous web to a fibrous carrier web using heated gaseous fluid may be found in U.S. Pat. Appl. Pub. Nos. 2011/0151171 (Biegler et al.) and 2011/0147475 (Biegler et al.).
- the patches of hook-type material may include openings as illustrated for example in
- FIG. 4 of US Patent Application Publication No. US2014/0142533 may be in the form of a repeating pattern of geometric shapes such as polygons.
- the polygons may be, for example, hexagons or quadrilaterals such as parallelograms or diamonds.
- the openings may be formed in the fastening patch by any suitable method, including die punching. In some embodiments, the openings may be formed by slitting the thermoplastic backing of a fastening patch to form multiple strands attached to each other at intact bridging regions in the backing and separating at least some of the multiple strands between at least some of the bridging regions.
- the bridging regions are regions where the backing is not cut through, and at least a portion of the bridging regions can be considered collinear with the slits.
- the intact bridging regions of the backing serve to divide the slits into a series of spaced-apart slit portions aligned in the direction of slitting (e.g., the machine direction), which can be referred to as interrupted slits.
- the spaced-apart slit portions are staggered in a direction transverse to the slitting direction (e.g., the cross-machine direction).
- the interrupted slits may be cut into the backing between some pairs of adjacent rows of male fastening elements although this is not a requirement.
- curved lines may be used, which can result in crescent shaped openings after spreading.
- the openings may be evenly spaced or unevenly spaced as desired. For openings that are evenly spaced, the spacing between the openings may differ by up to 10, 5, 2.5, or 1 percent. Further details about providing openings in a mechanical fastener can be found in U.S. Appl. Pub. No. 2012/0204383 (Wood et al.).
- the fastening patch can comprise multiple strands attached to each other at intact bridging regions in the backing without spreading the strands apart to create openings.
- the interrupted slits may be made in either the longitudinal direction of the absorbent article or in a transverse direction. Such slits may improve the flexibility of the fastening patch improve the peel performance. Further details about providing interrupted slits in a mechanical fastener can be found in U.S. Appl. Pub. No. 2011/0313389 (Wood et al.).
- the hook-type material can in some embodiments comprise multiple discrete fastening subcomponents.
- the laminate comprises a plurality of narrow fastening patch strips separated by a distance that is usually smaller than the length of each fastening patch (that is, in the direction of the longest dimension of the carrier).
- Hook-type fasteners may be attached to carrier 61 using any suitable method.
- adhesives e.g., pressure sensitive adhesives, hot melt adhesives, or structural adhesives
- non-adhesive bonding e.g., ultrasonic bonding, thermal bonding, compression bonding, or surface bonding as described above
- a central strip of carrier 61 separates, in this embodiment, the two strips of hook-type material 62 and 62' .
- Carrier areas laterally outside of the two outermost edges of the hook-type material are folded at folding operation 170 along folding dashed lines 68 and 68', thus increasing (in this case doubling) the thickness of the web in the sections that overlap after the fold, and transforming the pre-combined ear stock material into pre-combined folded hook stock material.
- the folds, in the would roll of pre-combined folded ear stock material 60 run continuously longitudinally in both the first hemisphere 69 and second hemispheres 69'. Folds 68 and 68' run parallel to the down-web orientation of the strip of hook material 62 and 62' . Folds 68 and 68' run down-web.
- Pre-combined ear stock material comprises first and second hemispheres 69 and 69', which are defined by a cross-web axis along the down-web dimension (that is, an axis bisecting the web running in the middle of the two strips of hook-material, down- web).
- the fold pattern comprises a single fold.
- the fold pattern of hemisphere 69 is symmetric with hemisphere 69' across the cross-web axis. In the embodiment shown in Figure 4, this means the distance between the outer edge of carrier 61 and the nearest fold is the same, for all intents and purposes, in hemispheres 69 and 69'.
- the pre-combined folded ear stock material is wound into roll 60 as part of a winding operation.
- the roll may contain any length of material desirable. In one embodiment it contains at least 10 meters of material. In another embodiment it contains at least 25 meters of material. In another embodiment it contains at least 100 meters of material. In another embodiment it contains at least 200 meters of material. In another embodiment it contains at least 250 meters of material. T
- the folded carrier material of the pre-combined folded ear stock material has a thickness that more closely matches the thickness of the area of the pre-combined ear stock material that includes the strip of hook- type material.
- the thickness of the hook material is in one embodiment about 0.2mm (200 microns) to about 0.5mm (500 microns).
- the carrier would, depending on implementation particulars, may have an average thickness that is between about 200 microns and 700 microns. These thickness ranges for both the hook material and the carrier are illustrative only; other thicknesses are possible depending on implementation.
- the carrier material in one embodiment has a thickness selected to be within about 80 to 120% of the thickness of the hook-type material.
- the carrier material has a thickness selected to be within about 70 to 130% of the thickness of the hook-type material. In another embodiment, the carrier material has a thickness selected to be within about 90 to 110% of the thickness of the hook-type material. In another embodiment, the carrier material has a thickness selected to be within about 60 to 140% of the thickness of the hook-type material.
- Cross sections 4a, 4b, and 4c of the pre-combined ear stock material are shown in Figures 4a, 4b, and 4c respectively.
- Cross section E-F shows the improved density of the pre- combined folded ear stock material as it would exist on the roll.
- Figure 5 - 10 show profile views of further configurations of strips of hook-type material with a carrier, where the carrier is folded so as to improve roll stability.
- Figure 5 shows a profile view of a single hook lane pre-combined ear stock material 70 having a single strip of hook-type material 72 disposed along the center cross-web axis in a down-web orientation.
- First and second hemispheres of carrier material 74 and 74' include a single fold 76 and 76' .
- the fold pattern is symmetric about cross web axis 71, and both the first and second hemispheres of carrier material have a symmetric fold orientation relative to one another.
- a roll of pre-combined folded ear stock material 70 may be unwound and cut into ear subassemblies, largely as shown with respect to Figure 3 - for example an S-type cut, or in whatever suitable shape / pattern is desired for the finished ear subassembly.
- the cut ear subassembly which would still include at least one fold as described herein, would then be coupled to the diaper body using techniques known in the art for ear subassemblies.
- a user of the diaper would then extend the tab, thereby unfolding it, across and over the outer cover of the front portion of the diaper, bringing the fastening component included thereon in contact with a suitable fastening component on the front outer cover of the diaper or absorbent article.
- Figure 6 shows a profile view of a further embodiment of a hook configuration and folding pattern combination in a pre-combined ear stock material suitable for placement on a roll.
- Pre-combined ear-stock material 80 is shown having two strips of hook-type material 82 and 82', separated by a central area 84.
- Carrier hemispheres 88 and 88' have been folded over and on top of the strips of hook-type material at folds 86 and 86' .
- Figure 7 shows a profile view of yet a further embodiment of a pre-combined ear stock material 90, in which a central strip of hook-type material 92 is coupled with two folds (folds 96, 96', 98, 98') in each of hemisphere 94 and 94', to provide the carrier with a "Z- fold" type configuration. Even in this configuration, the fold patterns in the hemispheres are symmetric with one another.
- Figure 8 shows a profile view of yet a further embodiment of a pre-combined ear stock material 100.
- a single strip of hook-type material 102 is coupled on a carrier defining two hemispheres each having one fold 104 and 104' respectively.
- Each hemisphere of carrier material overlaps the strip of hook-type material, and one of the hemispheres (in this one the one associated with carrier area 106') overlaps the other hemisphere (the hemisphere associated with carrier area 106).
- the fold patter established by folds 104 and 104' are symmetric in the embodiment shown. In another embodiment they are not symmetric.
- Figure 9 shows a profile view of yet a further embodiment of a pre-combined ear stock material 110. In this embodiment, two strips of hook material 102 and 102' are separated by a central carrier area 111 that includes folds 104 and 104' in it.
- Figure 10 shows a profile view of yet a further embodiment of a pre-combined ear stock material 120.
- a single strip of hook type material is oriented on the side of carrier opposite the direction of folds 124 and 124' .
- pre-combined ear stock material as described herein could yield a number of improvements.
- rolls of such pre-combined ear stock material as described herein could be larger and more dense, thus reducing shipment and inventory costs.
- rolls per shipment could potentially increase by 70% by folding in the edges of the carrier and being able to stack more rolls on a pallet at the same overall height as before.
- a roll of PSA coated hook material 13mm wide was mounted on a shaft.
- Hook material is available from 3M Company of St. Paul, MN under product name CHK-05810.
- the hook material was unwound and fed into a lamination process.
- a roll of 50gsm spunbond nonwoven carrier material 100mm wide was mounted on a different shaft.
- the nonwoven carrier material was also unwound and fed into the same lamination process.
- the PSA coated hook material was laminated to the nonwoven carrier material at a nip to secure the hook to the nonwoven producing a 100mm wide hook laminate.
- the 13mm wide hook was located in the center of the 100mm wide nonwoven producing two 43.5mm wide nonwoven flaps on either side of the hook portion of the hook laminate.
- each nonwoven flap was then folded 180 degrees towards the hook side of the laminate using a folding apparatus to produce a 60mm wide hook laminate web with two folds.
- the folded 60mm wide hook laminate web was then wound into a roll with the hooks facing inward producing a hook laminate roll that exhibited good stability.
- a roll was produced with the same method as described above with the exception that the nonwoven carrier flaps were not folded over prior to winding into a roll.
- the final width of the hook laminate in the above example was 60mm compared to the comparative example which was 100mm.
- the 60mm example was a denser roll, thus reducing shipment and inventory costs since more material can occupy the same volume. From a roll stability perspective, the 60mm roll was better than the 100mm roll of the comparative example since the extra folds on the edge of the nonwoven provide additional thickness to the laminate which provides support to the roll as the layers are stacked in the winding process.
Landscapes
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Vascular Medicine (AREA)
- Epidemiology (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Absorbent Articles And Supports Therefor (AREA)
- Slide Fasteners, Snap Fasteners, And Hook Fasteners (AREA)
Abstract
L'invention concerne un matériau de base d'ailette destiné à être utilisé dans des articles absorbants jetables, comprenant un élément de fixation et de multiples plis pour stabiliser le matériau lorsqu'il est sous forme de rouleau.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US201762481757P | 2017-04-05 | 2017-04-05 | |
US62/481,757 | 2017-04-05 |
Publications (1)
Publication Number | Publication Date |
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WO2018185677A1 true WO2018185677A1 (fr) | 2018-10-11 |
Family
ID=62046986
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/IB2018/052325 WO2018185677A1 (fr) | 2017-04-05 | 2018-04-04 | Matériau de base d'ailette de couche ayant un élément de fixation et de multiples plis |
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WO (1) | WO2018185677A1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP4378344A1 (fr) | 2022-12-02 | 2024-06-05 | Lohmann-koester GmbH & Co. KG | Matériau de bande de crochet, rouleau de matériau de bande de crochet et bobine |
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Publication number | Priority date | Publication date | Assignee | Title |
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EP4378344A1 (fr) | 2022-12-02 | 2024-06-05 | Lohmann-koester GmbH & Co. KG | Matériau de bande de crochet, rouleau de matériau de bande de crochet et bobine |
DE102022131979A1 (de) | 2022-12-02 | 2024-06-13 | Lohmann-Koester Gmbh & Co. Kg | Hakenbandmaterial sowie Hakenbandmaterialrolle und -spule |
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