WO2024003652A1 - Multilayer assembly for textile applications - Google Patents

Multilayer assembly for textile applications Download PDF

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Publication number
WO2024003652A1
WO2024003652A1 PCT/IB2023/056156 IB2023056156W WO2024003652A1 WO 2024003652 A1 WO2024003652 A1 WO 2024003652A1 IB 2023056156 W IB2023056156 W IB 2023056156W WO 2024003652 A1 WO2024003652 A1 WO 2024003652A1
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WO
WIPO (PCT)
Prior art keywords
layer
multilayer assembly
bonding layer
dmax
branches
Prior art date
Application number
PCT/IB2023/056156
Other languages
French (fr)
Inventor
Matteo Carraro
Original Assignee
Framis Italia S.P.A.
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Filing date
Publication date
Application filed by Framis Italia S.P.A. filed Critical Framis Italia S.P.A.
Publication of WO2024003652A1 publication Critical patent/WO2024003652A1/en

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Classifications

    • 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
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/266—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
    • 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
    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
    • B32B25/10—Layered products comprising a layer of natural or synthetic rubber next to a fibrous or filamentary layer
    • 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
    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
    • B32B25/14—Layered products comprising a layer of natural or synthetic rubber comprising synthetic rubber copolymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/16—Layered products comprising a layer of synthetic resin specially treated, e.g. irradiated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
    • 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
    • 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
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/027—Thermal 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
    • 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
    • B32B7/05—Interconnection of layers the layers not being connected over the whole surface, e.g. discontinuous connection or patterned connection
    • 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
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding 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
    • B32B2250/00—Layers arrangement
    • B32B2250/02—2 layers
    • 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
    • B32B2250/00—Layers arrangement
    • B32B2250/03—3 layers
    • 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
    • B32B2250/00—Layers arrangement
    • B32B2250/04—4 layers
    • 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
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0261—Polyamide fibres
    • 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
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0276—Polyester fibres
    • 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
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0292—Polyurethane fibres
    • 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
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/06—Vegetal fibres
    • B32B2262/062—Cellulose fibres, e.g. cotton
    • 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
    • B32B2274/00—Thermoplastic elastomer material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/51—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
    • B32B2405/00—Adhesive articles, e.g. adhesive tapes
    • 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
    • B32B2437/00—Clothing
    • 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
    • B32B2535/00—Medical equipment, e.g. bandage, prostheses or catheter

Definitions

  • the present invention regards the sector of manufacturing garments or medical braces and in particular the sector of solutions for bonding layers of fabric, preferably by heat-welding .
  • thermo-adhesive tape which is generally continuous and homogeneous , is often interposed between the fabric layers to hold the two layers together .
  • the Applicant has for years been producing and marketing a wide range of thermo-adhesive tapes , including those in the Framilon® series , to the considerable satis faction of its customers .
  • thermo-adhesive tape often exerts too vigorous an action, which prevents the multilayer assembly from having the desired elastic elongation for the speci fic function of the garment .
  • the obj ect of the present invention is to provide a multilayer assembly which overcomes the drawbacks mentioned above and meets the needs o f the sector .
  • FIG. 1 is a schematic view of a multilayer assembly according to an embodiment of the present invention
  • Fig . 2 is a diagram of a bonding layer of the multilayer assembly, according to an example embodiment ;
  • Fig . 3a, 3b and 3c show other examples of bonding layers of the multilayer assembly
  • FIG. 4 is a diagram of a multilayer assembly, according to another embodiment of the invention.
  • FIG. 5 is a diagram of a multilayer assembly, according to yet another embodiment of the invention.
  • FIG. 6 schematically represents a bonding layer of a multilayer assembly according to the present invention.
  • a multilayer assembly la for making a portion of a garment or the entire garment consists of: a first layer 2 made of textile material, having an inner face 2a and an outer face 2b; a second layer 4 made of textile material, having an inner face 4a and an outer face 4b; and a bonding layer 6 interposed between the first layer 2 and the second layer 4 and closely coupled superficially to the inner face 2a of the first layer 2 and the inner face 4a of the second layer 4.
  • the first layer 2 is coupled to the second layer 4 via the bonding layer 6.
  • a fabric is defined as "elastic, " in accordance with the international standard ISO 13934, if the elongation up to maximum force is greater than or equal to 8% in the selvage direction (e.g., in the weft direction) and/or transversely thereto (e.g., in the warp direction) .
  • the first layer 2 is a synthetic or natural or mixed elastic fabric.
  • the first layer 2 is a polyester-based fabric (i.e., having a composition in which the polyester constitutes, by weight, the relative majority of the components) or a polyamide-based fabric or a cotton-based fabric or a polyurethane-based fabric, e.g., Elastane.
  • a polyester-based fabric i.e., having a composition in which the polyester constitutes, by weight, the relative majority of the components
  • a polyamide-based fabric or a cotton-based fabric or a polyurethane-based fabric e.g., Elastane.
  • the second layer 4 is a synthetic or natural or mixed elastic fabric.
  • the second layer 4 is a polyester-based fabric or a polyamide-based fabric or a cotton-based fabric or a polyurethane-based fabric, e.g., Elastane.
  • the bonding layer 6 consists of a single piece that forms a perforated layer of polymeric material which, at a predefined temperature, activates adhesive properties toward the first layer 2 and the second layer 4, thus keeping them coupled even after cooling.
  • the bonding layer 6 is perforated in the sense of having a lattice structure with a plurality of openings 8 in orderly succession and with a predefined shape.
  • the bonding layer 6 has a lattice structure in which the openings 8 are in the shape of a rhombus having a major diagonal Dmax and a minor diagonal Dmin perpendicular to each other, wherein the major diagonal is greater than the minor diagonal.
  • the bonding layer 6 consists of a plurality of first branches 10 that are substantially straight, parallel and spaced apart and a plurality of second branches 12 that are substantially straight, parallel and spaced apart; the first branches 10 intersect the second branches 12, forming a lattice with rhomboidal openings 8.
  • the bonding layer 6 is a three- dimensional lattice in which:
  • the bonding layer 6 is a three- dimensional lattice in which:
  • the major diagonal (Dmax) of the rhomboidal openings has a length preferably between 2 and 4 millimeters (2 ⁇ Dmax ⁇ 4) , e.g. equal to 3 millimeters;
  • the minor diagonal (Dmin) of the rhomboidal openings has a length preferably between 1 and 3 millimeters (l ⁇ Dmin ⁇ 3) , e.g. equal to 2 millimeters;
  • the thickness (S) of the branches 10, 12 that delimit the rhomboidal openings is preferably between 0.50 and 1 millimeter (0.50 ⁇ Sdl) , e.g. equal to 0.75 millimeters;
  • the height (H) of the bonding layer 6 is uniform and preferably between 150 and 180 microns (150 ⁇ H ⁇ 180) , e.g. equal to 165 microns, with a tolerance of 3% (i.e. 165 microns ⁇ 5 microns) .
  • the first branches 10 and the second branches 12 are inclined with respect to the deformation direction X.
  • the imaginary diagonals of side-by- side openings define, for the multilayer assembly, a diagonal direction Y substantially parallel to the deformation direction X.
  • the bonding layer has circular or pseudo-circular openings (Fig. 3a) , or triangular openings with a common side (Fig. 3b) or mixed triangular and rhomboidal openings (Fig. 3c) .
  • the bonding layer 6 is made of a thermoplastic elastomer.
  • the bonding layer is made of thermoplastic polyurethane (TPU) , e.g., with a hardness of about 55 ShA, elongation at rupture of about 860% and a softening temperature between 130° - 140°C.
  • TPU thermoplastic polyurethane
  • the bonding layer is made of SEBS ( styrene-ethylene-butylene-styrene ) , e.g., with a hardness of about 15 ShA and a melting point of about 90°C.
  • SEBS styrene-ethylene-butylene-styrene
  • the first layer 2, the bonding layer 6 and the second layer 4 are coupled by hot lamination, generally activated between 120° - 150°C.
  • a multilayer assembly lb consists of the first layer 2 described above and the bonding layer 6 described above, closely coupled superficially to the first layer 2.
  • a multilayer assembly 1c consists of the first layer 2 described above, the bonding layer 6 described above, closely coupled superficially to one side of the first layer 2, and an auxiliary layer 20 consisting of a polymeric material, e.g. polyethylene (PE) , closely coupled superficially to the first layer 2, on the opposite side of the bonding layer 6.
  • PE polyethylene
  • the multilayer assembly la, lb, 1c is provided in a roll consisting of a continuous tape having a predetermined length, wound to form the roll.
  • the multilayer assembly described above is particularly suitable for making the waistband of leggings, the underbust band of a sport bra, bra cups, sport bras, men's underwear, girdles, portions of jeans, e.g., to create the push-up effect, or to make medical braces, such as knee braces, elbow braces, ankle braces and the like.
  • the first layer 2 of the multilayer assembly la is coupled to the bonding layer 6 and the bonding layer 6 to the second layer 4 by heat-welding, preferably simultaneously.
  • the first layer 2 of the multilayer assembly lb is coupled to the bonding layer 6, preferably by heat-welding, thus forming a tape, e.g., in a first factory; the tape, subsequently, e.g., in a second factory, is coupled to the second layer 4 via the bonding tape 6.
  • the first layer 2 of the multilayer assembly 1c is coupled to the bonding layer 6 by heatwelding, thus forming a tape, e.g. in a first factory; the tape, subsequently, usually in the same first factory, is coupled to the auxiliary layer 20 via the first layer 2.
  • the multilayer assembly described above overcomes the aforesaid drawbacks with reference to the prior art, as it allows for portions of garments that exhibit considerable elasticity to be created.
  • these portions exhibit considerable comfort, provide a lightweight feel, and exhibit high breathability.

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  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Details Of Garments (AREA)

Abstract

A multilayer assembly (1a, 1b, 1c) for textile applications, such as a portion of a garment or medical brace, comprises a first layer (2) made of elastic fabric and a bonding layer (6) made of polymeric elastic material. The bonding layer (6) has a three-dimensional lattice structure with rhomboidal openings (8) in orderly succession.

Description

DESCRIPTION
"MULTILAYER ASSEMBLY FOR TEXTILE APPLICATIONS"
[0001] The present invention regards the sector of manufacturing garments or medical braces and in particular the sector of solutions for bonding layers of fabric, preferably by heat-welding .
[0002] In order to best perform the function for which they are designed, some portions of certain garments or medical braces require a structure to maintain a desired shape during use . To achieve this feature , these portions are made by coupling multiple layers of fabric, since a single layer, no matter how rigid the material itsel f may be , cannot maintain the desired shape .
[0003] For this purpose , a thermo-adhesive tape , which is generally continuous and homogeneous , is often interposed between the fabric layers to hold the two layers together . The Applicant , for example , has for years been producing and marketing a wide range of thermo-adhesive tapes , including those in the Framilon® series , to the considerable satis faction of its customers .
[0004] However, the solutions known today have some drawbacks , such as in the case where the portion of the garment must have considerable elasticity, lightness , and breathability, such as in the case of the waistband of leggings , the underbust band of bras or the entire bra, girdles , or medical braces , such as knee braces , elbow braces , and the like .
[0005] In such cases , the thermo-adhesive tape often exerts too vigorous an action, which prevents the multilayer assembly from having the desired elastic elongation for the speci fic function of the garment .
[0006] Other known solutions are described, for example , in US2015/ 351474 , US4977011 , US2004 / 166756 , DE2746146, and WO2021 / 181160 .
[0007] The obj ect of the present invention is to provide a multilayer assembly which overcomes the drawbacks mentioned above and meets the needs o f the sector .
[0008] This obj ect is achieved by a multilayer assembly according to claim 1 . The dependent claims describe additional advantageous embodiments .
[0009] The features and advantages of the multilayer assembly according to this invention will become apparent from the following description, given by way of nonlimiting example according to the figures in the accompanying drawings , wherein :
- Fig . 1 is a schematic view of a multilayer assembly according to an embodiment of the present invention;
Fig . 2 is a diagram of a bonding layer of the multilayer assembly, according to an example embodiment ;
Fig . 3a, 3b and 3c show other examples of bonding layers of the multilayer assembly;
- Fig. 4 is a diagram of a multilayer assembly, according to another embodiment of the invention;
- Fig. 5 is a diagram of a multilayer assembly, according to yet another embodiment of the invention; and
- Fig. 6 schematically represents a bonding layer of a multilayer assembly according to the present invention.
[0010] According to a first embodiment (Fig. 1) , a multilayer assembly la for making a portion of a garment or the entire garment consists of: a first layer 2 made of textile material, having an inner face 2a and an outer face 2b; a second layer 4 made of textile material, having an inner face 4a and an outer face 4b; and a bonding layer 6 interposed between the first layer 2 and the second layer 4 and closely coupled superficially to the inner face 2a of the first layer 2 and the inner face 4a of the second layer 4. In other words, the first layer 2 is coupled to the second layer 4 via the bonding layer 6.
[0011] A fabric is defined as "elastic, " in accordance with the international standard ISO 13934, if the elongation up to maximum force is greater than or equal to 8% in the selvage direction (e.g., in the weft direction) and/or transversely thereto (e.g., in the warp direction) .
[0012] Preferably, the first layer 2 is a synthetic or natural or mixed elastic fabric.
[0013] For example, the first layer 2 is a polyester-based fabric (i.e., having a composition in which the polyester constitutes, by weight, the relative majority of the components) or a polyamide-based fabric or a cotton-based fabric or a polyurethane-based fabric, e.g., Elastane.
[0014] Preferably, the second layer 4 is a synthetic or natural or mixed elastic fabric.
[0015] For example, the second layer 4 is a polyester-based fabric or a polyamide-based fabric or a cotton-based fabric or a polyurethane-based fabric, e.g., Elastane.
[0016] The bonding layer 6 consists of a single piece that forms a perforated layer of polymeric material which, at a predefined temperature, activates adhesive properties toward the first layer 2 and the second layer 4, thus keeping them coupled even after cooling.
[0017] The bonding layer 6 is perforated in the sense of having a lattice structure with a plurality of openings 8 in orderly succession and with a predefined shape.
[0018] For example, according to a preferred embodiment (Fig. 2) , the bonding layer 6 has a lattice structure in which the openings 8 are in the shape of a rhombus having a major diagonal Dmax and a minor diagonal Dmin perpendicular to each other, wherein the major diagonal is greater than the minor diagonal. In other words, in such an embodiment, the bonding layer 6 consists of a plurality of first branches 10 that are substantially straight, parallel and spaced apart and a plurality of second branches 12 that are substantially straight, parallel and spaced apart; the first branches 10 intersect the second branches 12, forming a lattice with rhomboidal openings 8.
[0019] For example, the bonding layer 6 is a three- dimensional lattice in which:
- a first shape ratio (Rl) between the length of the major diagonal and the length of the minor diagonal (Rl=Dmax/Dmin) is between 0.5 and 4 (0.5<Rl<4) , e.g. equal to 1.5;
- a second shape ratio (R2) between the length of the major diagonal (Dmax) and the thickness (S) of the branches 10, 12 (R2=Dmax/S) is between 2 and 8 (2<R2<8) , e.g. equal to 4;
- a third shape ratio (R3) between the length of the major diagonal (Dmax) and the height (H) of the bonding layer (R3=Dmax/H) is between 10 and 30 (10<R3<30) , e.g. equal to 18;
- a fourth shape ratio (R4) between the thickness (S) of the branches and the height (H) of the bonding layer (R4=S/H) is between 2 and 7 (2<R4<7) , e.g. equal to 4.5. [0020] For example, the bonding layer 6 is a three- dimensional lattice in which:
- the major diagonal (Dmax) of the rhomboidal openings has a length preferably between 2 and 4 millimeters (2<Dmax<4) , e.g. equal to 3 millimeters;
- the minor diagonal (Dmin) of the rhomboidal openings has a length preferably between 1 and 3 millimeters (l<Dmin<3) , e.g. equal to 2 millimeters;
- the thickness (S) of the branches 10, 12 that delimit the rhomboidal openings is preferably between 0.50 and 1 millimeter (0.50<Sdl) , e.g. equal to 0.75 millimeters;
- the height (H) of the bonding layer 6 is uniform and preferably between 150 and 180 microns (150<H<180) , e.g. equal to 165 microns, with a tolerance of 3% (i.e. 165 microns ± 5 microns) .
[0021] The Applicant has found that the aforesaid specific dimensional ratios and/or specific dimensions allow for a garment or medical brace to be obtained that has excellent features of elasticity, breathability, and comfort .
[0022] Having defined a deformation direction X of a garment or medical brace, along which it is desired that said garment or brace exhibits pronounced deformation, the first branches 10 and the second branches 12 are inclined with respect to the deformation direction X. For example, preferably, the imaginary diagonals of side-by- side openings define, for the multilayer assembly, a diagonal direction Y substantially parallel to the deformation direction X.
[0023] In the context of this description, the terms "substantially straight" and "substantially parallel" are to be understood with relative reference to the normal tolerances associated with the technology for manufacturing the bonding layer.
[0024] According to other example embodiments, the bonding layer has circular or pseudo-circular openings (Fig. 3a) , or triangular openings with a common side (Fig. 3b) or mixed triangular and rhomboidal openings (Fig. 3c) .
[0025] Preferably, the bonding layer 6 is made of a thermoplastic elastomer.
[0026] For example, the bonding layer is made of thermoplastic polyurethane (TPU) , e.g., with a hardness of about 55 ShA, elongation at rupture of about 860% and a softening temperature between 130° - 140°C.
[0027] According to another example, the bonding layer is made of SEBS ( styrene-ethylene-butylene-styrene ) , e.g., with a hardness of about 15 ShA and a melting point of about 90°C.
[0028] Preferably, the first layer 2, the bonding layer 6 and the second layer 4 are coupled by hot lamination, generally activated between 120° - 150°C. [0029] According to another embodiment (Fig. 4) , a multilayer assembly lb consists of the first layer 2 described above and the bonding layer 6 described above, closely coupled superficially to the first layer 2.
[0030] According to yet another embodiment (Fig. 5) , a multilayer assembly 1c consists of the first layer 2 described above, the bonding layer 6 described above, closely coupled superficially to one side of the first layer 2, and an auxiliary layer 20 consisting of a polymeric material, e.g. polyethylene (PE) , closely coupled superficially to the first layer 2, on the opposite side of the bonding layer 6. Such an assembly is particularly suitable for making garment labels.
[0031] Preferably, the multilayer assembly la, lb, 1c is provided in a roll consisting of a continuous tape having a predetermined length, wound to form the roll.
[0032] The multilayer assembly described above is particularly suitable for making the waistband of leggings, the underbust band of a sport bra, bra cups, sport bras, men's underwear, girdles, portions of jeans, e.g., to create the push-up effect, or to make medical braces, such as knee braces, elbow braces, ankle braces and the like.
[0033] According to an example embodiment of the invention, in order to make the garment or brace, the first layer 2 of the multilayer assembly la is coupled to the bonding layer 6 and the bonding layer 6 to the second layer 4 by heat-welding, preferably simultaneously.
[0034] According to another example, the first layer 2 of the multilayer assembly lb is coupled to the bonding layer 6, preferably by heat-welding, thus forming a tape, e.g., in a first factory; the tape, subsequently, e.g., in a second factory, is coupled to the second layer 4 via the bonding tape 6.
[0035] According to yet another example, in order to create, e.g. a label, the first layer 2 of the multilayer assembly 1c is coupled to the bonding layer 6 by heatwelding, thus forming a tape, e.g. in a first factory; the tape, subsequently, usually in the same first factory, is coupled to the auxiliary layer 20 via the first layer 2.
[0036] Innovatively, the multilayer assembly described above overcomes the aforesaid drawbacks with reference to the prior art, as it allows for portions of garments that exhibit considerable elasticity to be created.
[0037] In addition, advantageously, these portions exhibit considerable comfort, provide a lightweight feel, and exhibit high breathability.
[0038] It is clear that a person skilled in the art may make changes to the multilayer assembly described above in order to meet incidental needs , these changes all falling within the scope of protection defined in the following claims .

Claims

Claims
1. A multilayer assembly (la, lb, 1c) for textile applications, for example a portion of a garment or medical brace, comprising a first layer (2) made of synthetic or natural or mixed elastic fabric, having an elongation up to maximum force greater than or equal to 8% in the selvage direction (for example in the weft direction) and/or transversely thereto (for example in the warp direction) , having an inner face (2a) and an opposite outer face (2b) , and a bonding layer (6) made of polymeric elastic material superficially coupled to the inner face (2a) of the first layer (2) , wherein the bonding layer (6) consists of a single body forming a layer having a lattice structure having a plurality of openings (8) in orderly succession and in the shape of a rhombus, defined by intersecting first branches (10) and second branches (12) , having a major diagonal (Dmax) and a minor diagonal (Dmin) perpendicular to each other, the major diagonal being greater than the minor diagonal, and wherein the first layer (2) is a polyester-based fabric or a polyamide-based fabric or a cotton-based fabric or a polyurethane-based fabric, and wherein the elastic polymeric material of the bonding layer (6) is a thermoplastic elastomer that activates adhesive properties toward the first layer (2) above a predefined temperature, thus remaining coupled thereto.
2. The multilayer assembly according to claim 1, wherein the bonding layer (6) is a three-dimensional lattice in which :
- a first shape ratio (Rl) between the length of the major diagonal and the length of the minor diagonal (Rl=Dmax/Dmin) is between 0.5 and 4 (0.5<Rl<4) , for example equal to 1.5;
- a second shape ratio (R2) between the length of the major diagonal (Dmax) and the thickness (S) of the branches (10, 12) (R2=Dmax/S) is between 2 and 8
(2<R2<8) , for example equal to 4;
- a third shape ratio (R3) between the length of the major diagonal (Dmax) and the height (H) of the bonding layer (R3=Dmax/H) is between 10 and 30 (10<R3<30) , for example equal to 18;
- a fourth shape ratio (R4) between the thickness (S) of the branches (10, 12) and the height (H) of the bonding layer (R4=S/H) is between 2 and 7 (2<R4<7) , for example equal to 4.5.
3. The multilayer assembly according to claim 1 or 2, wherein the bonding layer (6) is a three-dimensional lattice in which:
- the major diagonal (Dmax) of the rhomboidal openings has a length between 2 and 4 millimeters (2<Dmax<4) , for example equal to 3 millimeters;
- the minor diagonal (Dmin) of the rhomboidal openings has a length between 1 and 3 millimeters (l<Dmin<3) , for example equal to 2 millimeters;
- the thickness (S) of the branches (10, 12) is between 0.50 and 1 millimeter (0.50<Sdl) , for example equal to 0.75 millimeters;
- the height (H) of the bonding layer 6 is uniform and between 150 and 180 microns (150<H<180) , for example equal to 165 microns, with a tolerance within 3% (i.e. 165 microns ± 5 microns) .
4. The multilayer assembly according to any of the preceding claims, wherein the thermoplastic elastomer is thermoplastic polyurethane (TPU) or styrene-ethylene- butylene-styrene (SEBS) .
5. The multilayer assembly (la) according to any of the preceding claims, comprising a second layer (4) of synthetic or natural or mixed elastic fabric, having an inner face (4a) and an opposite outer face (4b) , wherein the bonding layer (6) is superficially coupled to the inner face (4a) of the second layer (4) .
6. The multilayer assembly according to claim 5, wherein the second layer (4) is a polyester-based fabric or a polyamide-based fabric or a cotton-based fabric or a polyurethane-based fabric.
7. The multilayer assembly according to claim 5 or 6, wherein the polymeric elastic material of the bonding layer (6) activates adhesive properties toward the second layer (2) above a predefined temperature, thus remaining coupled thereto.
8. The multilayer assembly (1c) according to any of claims 1 to 4, comprising an auxiliary layer (20) consisting of a polymeric material, for example polyethylene (PE) , superficially coupled to the outer face (2b) of the first layer (2) .
9. A continuous tape consisting of a multilayer assembly
(lb) according to any of claims 1 to 4, having a predefined length.
10. A roll consisting of a tape according to claim 9 which has been wound.
11. A continuous tape consisting of a multilayer assembly (la) according to any of claims 5 to 7, having a predefined length.
12. A roll consisting of a tape according to claim 11 which has been wound.
13. A continuous tape consisting of a multilayer assembly
(lc) according to claim 8, having a predefined length.
14. A roll consisting of a tape according to claim 13 which has been wound.
15. A garment or medical brace, comprising a multilayer assembly (la, lb, 1c) according to any of claims 1 to 8.
16. The garment or medical brace according to claim 15, comprising : a portion for which a deformation direction (X) is defined;
- wherein the first branches (10) and the second branches
(12) are inclined with respect to the deformation direction (X) .
17. The garment or medical brace according to claim 16, wherein the diagonals of side-by-side openings (8) define a diagonal direction (Y) substantially parallel to the deformation direction (X) .
PCT/IB2023/056156 2022-07-01 2023-06-14 Multilayer assembly for textile applications WO2024003652A1 (en)

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IT102022000014047 2022-07-01

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2746146A1 (en) * 1976-10-15 1978-04-20 Hercules Inc MULTI-LAYER TEXTILE SHEET, METHOD FOR THE PRODUCTION THEREOF AND DEVICE FOR IMPLEMENTING THE METHOD
US4977011A (en) * 1988-09-19 1990-12-11 Weyerhaeuser Company Disposable elastic structure
US20040166756A1 (en) * 1999-05-17 2004-08-26 Nippon Petrochemicals Co., Ltd. Composite sheet having elasticity, elastic web made from thermoplastic elastomer, and method and apparatus of manufacturing the same
US20150351474A1 (en) * 2012-12-28 2015-12-10 Douglas K. Farmer Garments including elastic composite fabric
WO2021181160A1 (en) * 2020-03-11 2021-09-16 W. L. Gore & Associates Gmbh Arc flash protective materials

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2746146A1 (en) * 1976-10-15 1978-04-20 Hercules Inc MULTI-LAYER TEXTILE SHEET, METHOD FOR THE PRODUCTION THEREOF AND DEVICE FOR IMPLEMENTING THE METHOD
US4977011A (en) * 1988-09-19 1990-12-11 Weyerhaeuser Company Disposable elastic structure
US20040166756A1 (en) * 1999-05-17 2004-08-26 Nippon Petrochemicals Co., Ltd. Composite sheet having elasticity, elastic web made from thermoplastic elastomer, and method and apparatus of manufacturing the same
US20150351474A1 (en) * 2012-12-28 2015-12-10 Douglas K. Farmer Garments including elastic composite fabric
WO2021181160A1 (en) * 2020-03-11 2021-09-16 W. L. Gore & Associates Gmbh Arc flash protective materials

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