WO1997034762A1 - Stratifies de cuir ou de succedane du cuir - Google Patents

Stratifies de cuir ou de succedane du cuir Download PDF

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Publication number
WO1997034762A1
WO1997034762A1 PCT/GB1997/000719 GB9700719W WO9734762A1 WO 1997034762 A1 WO1997034762 A1 WO 1997034762A1 GB 9700719 W GB9700719 W GB 9700719W WO 9734762 A1 WO9734762 A1 WO 9734762A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
leather
elasticity
layers
laminate
Prior art date
Application number
PCT/GB1997/000719
Other languages
English (en)
Inventor
Paul Michael Fielden
John Frederick Loxston
Original Assignee
Pittards Public Limited Company
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
Priority claimed from GBGB9605637.9A external-priority patent/GB9605637D0/en
Priority claimed from GBGB9618617.6A external-priority patent/GB9618617D0/en
Application filed by Pittards Public Limited Company filed Critical Pittards Public Limited Company
Priority to AU19355/97A priority Critical patent/AU1935597A/en
Priority to EP97907214A priority patent/EP0888214A1/fr
Publication of WO1997034762A1 publication Critical patent/WO1997034762A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C14—SKINS; HIDES; PELTS; LEATHER
    • C14B—MECHANICAL TREATMENT OR PROCESSING OF SKINS, HIDES OR LEATHER IN GENERAL; PELT-SHEARING MACHINES; INTESTINE-SPLITTING MACHINES
    • C14B7/00—Special leathers and their manufacture
    • C14B7/02—Composite leathers
    • 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
    • B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
    • B32B9/04—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material

Definitions

  • This invention relates to laminates made by combining leather or leather substitute materials with a layer of synthetic backing material, to methods of production thereof, and to articles made from said laminates.
  • a laminate made of leather with a backing of structural synthetic fibre including elastomeric fibres has several advantages, in terms of the enhanced mechanical and/or wear characteristics.
  • suitable selection of the respective elastic moduli of the layers we can provide a laminate in which, following extension and/or flexing, the elastomeric backing layer on recovery can return the leather layer to the required shape.
  • Of particular importance in attaining these benefits are the relative alignment of the axis or axes of minimum modulus of elasticity and elastic recovery of the two layers.
  • a laminate comprising a first layer of leather or leather substitute secured to a second layer of woven synthetic or part synthetic material containing elastomeric fibres, characterised in that each of said layers has an anisotropic elasticity property, and in that the layers are oriented with respect to each other so that the axis or axes of minimum modulus of elasticity in the first layer extends at an angle of 45° or less to that or those in the second layer.
  • the orientation of the fibres is such that the- modulus of elasticity varies in different regions relative to a fixed axis normally taken to be the line of the backbone, and accommodates body, curvature and movement of the animal.
  • the fibre orientation of curvature can be modified by a variety of means well known to those practised in the art so that the topographical distribution of the orientation of the axis or axes of minimum modulus of elasticity can range from generally parallel to the backbone to generally perpendicular to the backbone. Even so, there will be localised distortions particularly in the shank or axillae regions where the vector can lie up to approximately 45° from the principal direction of high modulus.
  • the maximum elastic recovery of the skin will usually be along the line of minimum modulus of elasticity.
  • the second or backing layer is preferably aligned with its minimum modulus of elasticity parallel to the minimum modulus of elasticity of the leather layer. Its lower modulus vector will then be harmonised with the lower modulus direction in the leather layer. This arrangement retains the basic characteristics of the leather.
  • Another important factor is the elastic power of recovery of the second or backing layer. This is ideally selected so that it is high enough to reverse at least a major part of the non-elastic portion of the leather extension. The power required will be naturally dependent on the modulus of the leather and its thickness. There is a further consideration in selecting the second or backing layer. A relatively high initial modulus of elasticity in the second or backing layer and a high degree of continuous adhesion to the leather would give a laminate which when either bent with the leather side innermost or compressed in its principal plane, beyond the original relaxed position, would have a high tendency to form wave patterns or wrinkles. This can be minimised or reduced by having a non-continuous adhesive film and fabric of a sufficiently low modulus of elasticity not to cause the formation of such wrinkles when the leather is bent.
  • the axis or axes of minimum elastic modulus extend in substantially the same direction in each layer.
  • the orientation of the axis of minimum modulus of elasticity will vary at different positions on the hide or skin.
  • the axis may run along the backbone region in the centre of the hide or skin, whereas in the leg regions the axis may run at 30° or 40° to the backbone region.
  • the relative orientation of the axes may be selected to optimise the mechanical/elasticity properties of the finished laminate taking into account its required use and the principal regions of interest in the finished laminate.
  • the laminate may be produced by laminating a whole or a substantial part of the hide, or selected parts only of the hide may be cut out and laminated.
  • the laminate may be produced in bulk and then shipped to the manufacturer of the end goods, or it may be produced on site by the manufacturer of the end goods, after cutting the leather or substitute into pieces.
  • the first layer may be selected from a wide range of materials.
  • it may comprise natural leather which has been treated or formed to provide or maintain anisotropic elasticity properties.
  • the processing and handling steps for producing such materials are well known to those skilled in the art.
  • the first layer may comprise a piece of synthetic leather material treated or formed to have anisotropic elasticity properties.
  • synthetic leather material any material having leather or leather-like properties and capable of being used as a substitute therefor.
  • a typical example is Microfibre, (TM) available from Du Pont, a synthetic suede material, and many more will be known to those skilled in the art, as will methods of producing anisotropic elasticity properties therein.
  • the first and second layers are preferably secured together by adhesive bonding.
  • adhesive bonding A wide variety of adhesives and methods of application may be used.
  • the adhesive may be applied by spraying, roller coating, knife coating, or applied to a release sheet and then attached to the layer, or applied by any other application method known to those skilled in the art.
  • a liquid adhesive may be sprayed onto the back of the first layer and dried or allowed to dry to a low tack state so that a supply of said first layers may be stacked for storage, without bonding to each other.
  • the adhesive-coated first layer and the second layer are then brought together in a press at an elevated temperature and pressure for a period sufficient to bond the two layers together.
  • a typical example of a suitable adhesive for bonding the layers together could comprise a mixture of acrylic copolymer dispersions and a polyurethane aqueous emulsion blended to provide a modulus compatible with the two layers of the laminate.
  • the press temperature may lie m the range of from 90°C to 110°C and ideally be around 100°C.
  • the pressure may lie m the range of 50 kg/cm 2 to 200 kg/cm 2 and ideally be around 150 kg/cm 2 .
  • the pressing period may lie in the range of from 2 sec. to 6 sec and ideally be around 4 sec.
  • the adhesive is preferably applied m an amount corresponding to between 30g/m 2 and 50g/m* , and preferably around 40g/m 2 .
  • the adhesive layer is discontinuous, to allow water vapour to permeate through the laminate in use, and to reduce or minimise the possibility of wrinkling.
  • the second layer may take many forms. In one example it comprises a woven mixture of synthetic elastomeric fibres and polyester and/or polyamide fibres. We have found that the use of a wholly or substantially wholly synthetic second layer provides important mechanical and other advantages such as tactile satisfaction, hydrothermal comfort, wearer benefits and general longevity.
  • An example of a suitable synthetic fibre is the synthetic spun elastomeric fibre sold under the Trade Mark LYCRA by Du Pont .
  • the invention also extends to laminates where the second layer consists of a mixture of synthetic elastomeric fibres and natural fibres such as cotton.
  • the mechanical properties of the two layers are preferably selected to be harmonious and consistent with the required properties of the laminate, and with those of the other layer.
  • the invention also extends to a method of producing a laminate material as herein described, and to articles made from said laminate material. It will be appreciated that the laminate may include one or more additional layers either between the first and second layer, or to the other side of the second layer.
  • Example 1 Laminate of Water Repellent Aniline Hairsheep Shoe leather with Sleeknit Fabric.
  • a first layer of water repellent aniline hairsheep shoe leather (0.7mm thick) with the maximum elasticity, (i.e. axis of minimum modulus of elasticity) running generally parallel to the backbone was laminated to Sleeknit fabric (0.4mm thick) available from Penn Nyla, Nottingham, UK, and comprising a 71%:29% polyamide elastane mix.
  • the following adhesive mix was used: -
  • This laminate would be suitable for a ladies fashion shoe with a simple construction (whole or 3/4 cut) , for indoor and outdoor use.
  • the adhesive was sprayed onto the flesh side of the leather at a coverage rate of 40g/m 2 , and then allowed to dry.
  • the Coolmax fabric was placed onto the flesh side of the leather, with the maximum elasticity (i.e. axis of minimum modulus of elasticity) running parallel to the backbone and the layers pressed at 150 kg/cm 2 for 6 seconds at 100 ° C .
  • This laminate would be suitable for a ladies comfort shoe, predominantly for outdoor use.
  • Example 3 Aniline Hairsheep sportsglove leather with Coolmax (TM) fabric.
  • the adhesive was sprayed onto the flesh side of the leather at 30g/m 2 , and then allowed to dry.
  • the Coolmax fabric was placed onto the leather with the maximum elasticity (i.e. axis of minimum modulus of elasticity) running perpendicular to the backbone and pressed at 100 kg/cm 2 for 4 seconds at 95°C.
  • This laminate would be suitable for manufacturing sports gloves.
  • samples of Bovine leather Bovine (Sirena) Gram Split, m various finishes, colours and shades, and Bovine Nubuck in various colours and shades
  • a Lycra-containing material comprising 82% polyamide and 18% Elastane (Lycra) m a Powernet weave.
  • a layer of the leather material between 0.8 and 1.0 mm thick
  • the maximum elasticity i.e. axis of minimum modulus of elasticity
  • Mybond 3143 a single component polyurethane emulsion adhesive.
  • the adhesive was sprayed at a coverage rate of 12-15 g/m 2 onto both bonding surfaces and then allowed to dry.
  • the Powernet material was placed onto the leather with the Lycra fibres (i.e. axis of minimum modulus of elasticity) oriented perpendicular to the backbone of the leather and then ironed, with steam, at 80° to 100° at a pressure of up to 2kPa.
  • This laminate is suitable for men's formal or semi- formal footwear.
  • a stock of leather or leather substitute is cut into pieces of the required size and shape and is then laminated to a layer of woven synthetic or part synthetic material.
  • a layer of woven synthetic or part synthetic material is pre-coated with an adhesive, for example a hot-melt adhesive generally in accordance with the conditions and composition of the previous examples.
  • the shoe manufacturer is supplied with the hot-melt adhesive coated synthetic or part synthetic material in bulk, for example on a roll, and the laminate may then be .formed without requiring prior application of adhesive to the cut leather pieces .
  • the synthetic or part synthetic layer may be selectively applied only to those pieces of the shoe requiring lamination, and parts of the shoe not normally subjected to flexing or not normally visible or which otherwise do not require lamination can be left un- laminated.
  • Laminating the leather after cutting also means that the axis of maximum stretch of the synthetic or part synthetic layer can be more exactly aligned to the local axis of maximum stretch of the leather or leather substitute material, whereas if the whole hide is laminated, any local variations in orientation of the axes of maximum stretch in the hide mean that alignment of the axes in the leather/ leather substitute layer and the synthetic layer is inevitably a compromise.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Ceramic Engineering (AREA)
  • Laminated Bodies (AREA)
  • Synthetic Leather, Interior Materials Or Flexible Sheet Materials (AREA)

Abstract

L'invention porte sur un stratifié de cuir ou de succédané du cuir obtenu par fixation d'une première couche de cuir ou de succédané du cuir à une deuxième couche d'un matériau tissé synthétique ou partiellement synthétique, par exemple de fibres élastomères filées de Lycra®. Les couches présentent une élasticité anisotrope, et elles sont disposées de manière à ce que l'axe ou les axes du module d'élasticité minimal de la première couche fassent un angle de 45° ou moins avec celui ou ceux de la deuxième couche. Le module d'élasticité et la force élastique de la deuxième couche peuvent être choisis de manière à être assez élevés pour que la deuxième couche ramène à l'état initial au moins la partie principale de la portion non élastique correspondant à l'allongement du cuir lors de son relâchement.
PCT/GB1997/000719 1996-03-18 1997-03-17 Stratifies de cuir ou de succedane du cuir WO1997034762A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU19355/97A AU1935597A (en) 1996-03-18 1997-03-17 Leather or leather substitute laminates
EP97907214A EP0888214A1 (fr) 1996-03-18 1997-03-17 Stratifies de cuir ou de succedane du cuir

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GBGB9605637.9A GB9605637D0 (en) 1996-03-18 1996-03-18 Leather or leather substitute laminates
GB9605637.9 1996-03-18
GB9618617.6 1996-09-06
GBGB9618617.6A GB9618617D0 (en) 1996-09-06 1996-09-06 Leather or leather substitute laminates

Publications (1)

Publication Number Publication Date
WO1997034762A1 true WO1997034762A1 (fr) 1997-09-25

Family

ID=26308943

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1997/000719 WO1997034762A1 (fr) 1996-03-18 1997-03-17 Stratifies de cuir ou de succedane du cuir

Country Status (4)

Country Link
EP (1) EP0888214A1 (fr)
AU (1) AU1935597A (fr)
CA (1) CA2249416A1 (fr)
WO (1) WO1997034762A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998016662A1 (fr) * 1996-10-15 1998-04-23 E.I. Du Pont De Nemours And Company Procede de fabrication de lamines de cuir etires et des articles finis contenant lesdits lamines
WO2001086004A2 (fr) * 2000-05-05 2001-11-15 E.I. Du Pont De Nemours And Company Cuir naturel revetu a faible deformation
US7002922B1 (en) 1999-03-31 2006-02-21 Sony Corporation Communication network specific charging method and communication network specific charging apparatus
WO2006086854A1 (fr) * 2005-02-18 2006-08-24 Simon Jeremy Skirrow Ameliorations apportees a la peau de chevre utilisee pour la fabrication de chaussures et de vetements
EP2604705A1 (fr) * 2012-03-21 2013-06-19 Costantino Karazissis Dolzanelli Procédé de préparation de cuir de quatre manières

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2136092A (en) * 1937-03-10 1938-11-08 Troy Seymour Method of making elastic leather
US2269923A (en) * 1938-10-14 1942-01-13 Us Rubber Co Stretchable leather
FR1428245A (fr) * 1965-02-26 1966-02-11 Produit industriel nouveau constitué par des surfaces de cuir armées
DE1760286A1 (de) * 1968-04-27 1971-11-25 Basf Ag Verfahren zur Qualitaetsverbesserung von geschliffenem Loder und von Spaltleder
FR2677922A1 (fr) * 1991-06-18 1992-12-24 Maury Jean Materiau composite pour la confection et la decoration et son procede d'obtention.
WO1993003918A1 (fr) * 1991-08-19 1993-03-04 Jelau Materiau composite elastique a base de cuir
FR2681876A1 (fr) * 1991-09-30 1993-04-02 Guenoun Henri Procede de revetement de cuir cote chair d'un tissu de maille elastique et produit ainsi obtenu.
FR2686098A1 (fr) * 1992-01-10 1993-07-16 Guenoun Henri Materiau composite stratifie comprenant une peau, un cuir naturel ou un de leurs sous produits et un ou plusieurs produits elastiques adjacents.

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2136092A (en) * 1937-03-10 1938-11-08 Troy Seymour Method of making elastic leather
US2269923A (en) * 1938-10-14 1942-01-13 Us Rubber Co Stretchable leather
FR1428245A (fr) * 1965-02-26 1966-02-11 Produit industriel nouveau constitué par des surfaces de cuir armées
DE1760286A1 (de) * 1968-04-27 1971-11-25 Basf Ag Verfahren zur Qualitaetsverbesserung von geschliffenem Loder und von Spaltleder
FR2677922A1 (fr) * 1991-06-18 1992-12-24 Maury Jean Materiau composite pour la confection et la decoration et son procede d'obtention.
WO1993003918A1 (fr) * 1991-08-19 1993-03-04 Jelau Materiau composite elastique a base de cuir
FR2681876A1 (fr) * 1991-09-30 1993-04-02 Guenoun Henri Procede de revetement de cuir cote chair d'un tissu de maille elastique et produit ainsi obtenu.
FR2686098A1 (fr) * 1992-01-10 1993-07-16 Guenoun Henri Materiau composite stratifie comprenant une peau, un cuir naturel ou un de leurs sous produits et un ou plusieurs produits elastiques adjacents.

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998016662A1 (fr) * 1996-10-15 1998-04-23 E.I. Du Pont De Nemours And Company Procede de fabrication de lamines de cuir etires et des articles finis contenant lesdits lamines
US5932056A (en) * 1996-10-15 1999-08-03 E. I. Du Pont De Nemours And Company Method for making stretch leather laminates and finished articles containing such laminates
CN1106449C (zh) * 1996-10-15 2003-04-23 纳幕尔杜邦公司 制造拉伸织物和可拉伸皮革的叠层的方法,制成品和鞋
US7002922B1 (en) 1999-03-31 2006-02-21 Sony Corporation Communication network specific charging method and communication network specific charging apparatus
WO2001086004A2 (fr) * 2000-05-05 2001-11-15 E.I. Du Pont De Nemours And Company Cuir naturel revetu a faible deformation
WO2001086004A3 (fr) * 2000-05-05 2002-04-04 Du Pont Cuir naturel revetu a faible deformation
KR100725205B1 (ko) * 2000-05-05 2007-06-07 이 아이 듀폰 디 네모아 앤드 캄파니 변형도가 낮은 코팅된 천연 가죽
WO2006086854A1 (fr) * 2005-02-18 2006-08-24 Simon Jeremy Skirrow Ameliorations apportees a la peau de chevre utilisee pour la fabrication de chaussures et de vetements
EP2604705A1 (fr) * 2012-03-21 2013-06-19 Costantino Karazissis Dolzanelli Procédé de préparation de cuir de quatre manières

Also Published As

Publication number Publication date
EP0888214A1 (fr) 1999-01-07
CA2249416A1 (fr) 1997-09-25
AU1935597A (en) 1997-10-10

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