EP1729618A1 - Cookware exhibiting an improved scratch resistance - Google Patents

Cookware exhibiting an improved scratch resistance

Info

Publication number
EP1729618A1
EP1729618A1 EP05746686A EP05746686A EP1729618A1 EP 1729618 A1 EP1729618 A1 EP 1729618A1 EP 05746686 A EP05746686 A EP 05746686A EP 05746686 A EP05746686 A EP 05746686A EP 1729618 A1 EP1729618 A1 EP 1729618A1
Authority
EP
European Patent Office
Prior art keywords
culinary article
patterns
discontinuous layer
article according
layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP05746686A
Other languages
German (de)
French (fr)
Inventor
Jean-Pierre Buffard
Claudine Gardaz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SEB SA
Original Assignee
SEB SA
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
Application filed by SEB SA filed Critical SEB SA
Publication of EP1729618A1 publication Critical patent/EP1729618A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47JKITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J36/00Parts, details or accessories of cooking-vessels
    • A47J36/02Selection of specific materials, e.g. heavy bottoms with copper inlay or with insulating inlay
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47JKITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J27/00Cooking-vessels
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47JKITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J36/00Parts, details or accessories of cooking-vessels
    • A47J36/02Selection of specific materials, e.g. heavy bottoms with copper inlay or with insulating inlay
    • A47J36/025Vessels with non-stick features, e.g. coatings
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47JKITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J36/00Parts, details or accessories of cooking-vessels
    • A47J36/02Selection of specific materials, e.g. heavy bottoms with copper inlay or with insulating inlay
    • A47J36/04Selection of specific materials, e.g. heavy bottoms with copper inlay or with insulating inlay the materials being non-metallic

Definitions

  • the present invention relates to a culinary article comprising a non-stick coating deposited on a metal support, such as aluminum or aluminum alloy.
  • the non-stick coatings commonly used to coat cookware are made from fluorocarbon resin, such as polytetrafluoroethylene (PTFE). If they are known for their non-stick properties as well as for their chemical and thermal resistance, PTFE-based coatings have the disadvantage of being particularly sensitive to scratching, in particular in the zone corresponding to the stressed surface. of the cookware. As a result, there is generally an early wear of cookware with this type of coating.
  • This frame is formed of oblong elements arranged in a network, the composition of which comprises PTFE and from 5 to 20% by weight, preferably from 10 to 15% by weight, of fillers, in particular of metallic or mineral powder.
  • the frame is then covered with a final layer of pure or lightly loaded PTFE, which completely drowns the frame.
  • the surface in contact with food is consequently flat and therefore does not include deflection zones making it possible to effectively deflect the forces generated by metallic objects.
  • Such a coating still has a certain sensitivity to scratching. In addition, it consumes a significant amount of charged material intended to form the reinforcement.
  • document EP 0 580 557 proposes a non-stick coating comprising a layer of non-stick material which has a discontinuous and non-constant thickness.
  • a discontinuous layer is applied to a first continuous layer of constant thickness over the entire surface of the support.
  • This discontinuous layer is deposited at least on the central part of the bottom of the culinary article in a pattern which may be irregular or regular, in the form of a network, of dots or of graphic elements.
  • the last layer of the coating is formed by the discontinuous layer which in a way creates "relief" zones.
  • a solution to the problem posed is a culinary article formed by a metallic support and a non-stick coating deposited at least on the surface of the metallic support constituting the interior of the culinary article, the non-stick coating comprising at least two layers based on fluorocarbon resin, one of the at least two layers, which covers at least the stressing surface of the interior of the culinary article, being a discontinuous layer forming patterns.
  • any cross section of the culinary article, at least at the level of its stressing surface exhibits regular interruptions in the plane of the discontinuous layer and each pattern presents, in top view of the interior of the cookware, an area of at least 1 mm 2 .
  • the discontinuous layer therefore has patterns arranged in such a way that deflection zones limit the action of the forces generated by metallic or aggressive objects, without creating marked "relief” zones.
  • the composition of the discontinuous layer formed of the patterns comprises at least one fluorocarbon resin as well as fillers.
  • the presence of fillers in the composition of the patterns makes it possible to reinforce the resistance of the entire discontinuous layer and, consequently, to reinforce the overall resistance of the non-stick coating of the culinary article.
  • the fillers contain pigments, it is advantageously possible to produce a culinary article in which the discontinuous layer forms a decoration which becomes visible through the non-stick coating, in the case where the layers of the non-stick coating located at the - above the discontinuous layer are transparent.
  • FIG. 3 represents an enlarged schematic view in cross-section of another embodiment of a culinary article in accordance with the invention.
  • the elements common to the different figures are identified by identical references.
  • FIG. 1 there is shown a schematic view from above of a culinary article 1.
  • This culinary article 1 comprises a central zone la, which corresponds to the stressing surface of the culinary article 1, which is that suitable for receiving and to be in contact with food and therefore with metallic objects, and which corresponds practically in general to the bottom of the culinary article 1.
  • this stressing surface la could be larger than the bottom surface or on the contrary more reduced.
  • a peripheral crown 1b corresponds to the edge of the culinary article 1 and surrounds said biasing surface 1a.
  • the cookware 1 is formed of a metal support 2 and of a non-stick coating 3 deposited on the metal support 2.
  • the metal support 2 is commonly made of aluminum, aluminum alloy, stainless steel or titanium.
  • the non-stick coating 3 comprises at least two layers based on fluorocarbon resin, one of the at least two layers, covering at least the stressing surface 1a of the interior of the culinary article 1, being a discontinuous layer 5 forming patterns 6, 6 '.
  • the non-stick coating 3 comprises a first continuous layer 4 of constant thickness, covering the entire interior surface ld of the metal support 2 and on which the discontinuous layer 5 is deposited on at least the area of the stressing surface la, along a plane P 3 parallel to the plane of the bottom P 2 , and the patterns 6, 6 'of which are separated by interruptions 9 in the material constituting the discontinuous layer 5.
  • these two layers 4 and 5 can be reversed, the discontinuous layer 5 can then be located directly on the metal support 2 and, in any event, under the first layer
  • the non-stick coating 3 is such that any cross section II-II, that is to say perpendicular to the plane P 2 defined by the bottom surface of the article 1, that this cross section is straight , that is to say formed of a single line segment and therefore not able to be constituted by a broken line, or that it is curved, has regular interruptions 9 in the plane P 3 higher and parallel to P 2 of the discontinuous layer 5, resulting on the one hand in a non-constant thickness of the non-stick coating 3 and on the other hand by a "decoration" comprising no rectilinear, curved, parallel or intersecting line with other lines.
  • each pattern 6, 6 ' has, in top view of the interior of the culinary article 1, an area of at least 1 mm 2 .
  • Such a minimum surface requirement makes it possible to create deflection zones capable of repelling the action of the forces generated by metallic objects.
  • This minimum surface value is also suitable for industrial use.
  • the surface of each pattern 6, 6 ′ is between 1 and 10 mm 2 .
  • the proportion of surface covered by the "decoration" consisting of all of the patterns 6, 6 ' is greater than 15% of the total surface area applied to of the culinary article 1. More preferably , this proportion of surface covered by all of the patterns 6, 6 ′ is between 15 and 40% of the central zone forming it the total stressed surface of the culinary article 1.
  • the patterns 6, 6 ' can be applied by any conventional means commonly used for the application of non-stick coatings based on fluorocarbon resin.
  • the discontinuous layer 5 formed and constituting the patterns 6, 6 ′ is preferably applied by screen printing, in particular when the stamping operation is carried out after formation of the non-stick coating 3 on the 2-plane metal support.
  • a method of application by pad printing is preferably envisaged.
  • the composition of the discontinuous layer 5 constituting the patterns 6, 6 ′ comprises at least one fluorocarbon resin.
  • the fluorocarbon resins suitable for the composition of the first layer 4 and of the discontinuous layer 5 are in particular described in document US 5,536,583.
  • composition of the discontinuous layer 5 forming the patterns 6, 6 'further comprises pigments, aimed at imparting a color to the said patterns 6, 6'.
  • pigments chosen from smoke black, titanium oxide Ti0 2 , mica flakes or silica flakes, said flakes being covered with oxides metal.
  • thermochromic pigments and in particular iron oxide Fe 2 0 3 and / or perylene red, described in document WO 00/22395.
  • the weight proportion of the pigments is determined as a function of the ability to cover said pigments. This weight proportion is commonly between 0.5 to 15% of the composition of the discontinuous layer 5 forming the patterns 6, 6 '. This weight proportion can be reduced to be between 0.5 and 7.5% of the composition of the discontinuous layer 5, in particular when pigments in the form of flakes are used, and / or when a application by screen printing of this discontinuous layer 5.
  • a non-stick coating 7 is shown formed of three layers, the first layer 4 and the discontinuous layer 5 being similar to those shown in FIG. 2.
  • the discontinuous layer 5 is covered by at least one finishing layer 8, also based on fluorocarbon resin as described above.
  • the patterns 6, 6 ′ of the discontinuous layer 5 and the finishing layer 8 is transparent, the patterns

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Cookers (AREA)
  • Laminated Bodies (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Table Equipment (AREA)
  • Paints Or Removers (AREA)
  • Baking, Grill, Roasting (AREA)

Abstract

The invention relates to a cookware consisting of a metal support (2) and an anti-adhesive coating (3) applied thereto and comprising at least two fluorocarbon resin-based layers, wherein one layer is embodied in the form of a discontinuous layer (5) formed by patterns (6, 6'). Each cross section of said at least two layers is embodied in the form of discontinuities (9) and each pattern (6, 6') is embodied in the form of a surface at least of 1mm<2>.

Description

Article culinaire présentant une résistance à la rayure améliorée Cookware with improved scratch resistance
La présente invention concerne un article culinaire comprenant un revêtement anti-adhésif déposé sur un support métallique, tel qu'en aluminium ou en alliage d ' aluminium. Les revêtements anti-adhésifs couramment utilisés pour revêtir des articles culinaires sont réalisés à base de résine fluorocarbonée, telle que du polytétrafluoroéthylène (PTFE) . S'ils sont connus pour leurs propriétés anti- adhésives ainsi que pour leur résistance chimique et thermique, les revêtements à base de PTFE présentent toutefois l'inconvénient d'être particulièrement sensibles à la rayure, en particulier dans la zone correspondant à la surface sollicitée de l'article culinaire. De ce fait, il se produit généralement une usure précoce d'articles culinaires dotés de ce type de revêtements . Pour remédier à cet inconvénient majeur et obtenir des revêtements anti-adhésifs présentant une résistance améliorée à la rayure, diverses techniques ont été développées, dont certaines ont fait l'objet de demandes de brevet comme celles citées ci-après : ces techniques proposent pour un article culinaire formé d'un support métallique, un revêtement anti-adhésif déposé sur ce support métallique et comprenant au moins deux couches à base de résine fluorocarbonée, l'une des au moins deux couches étant une couche discontinue formant des motifs. Le document EP 0 285 161 décrit un revêtement comprenant, à partir du support métallique, une première couche disposée sur ledit support et recouverte, le cas échéant, d'une seconde couche de PTFE pure ou chargée. Sur cette première, ou seconde couche, est ensuite déposée une troisième couche dite "armature" . Cette armature est formée d'éléments oblongs agencés en réseau, dont la composition comprend du PTFE et de 5 à 20% en poids, de préférence de 10 à 15% en poids, de charges, notamment de poudre métallique ou minérale. L'armature est ensuite recouverte d'une dernière couche de PTFE pur ou faiblement chargé, qui noie totalement 1 ' armature . La surface en contact avec les aliments est en conséquence plane et ne comporte donc pas de zones de déflexion permettant de dévier de manière efficace les forces engendrées par les objets métalliques. Un tel revêtement présente encore une certaine sensibilité à la rayure. En outre, il consomme une quantité importante de matière chargée destinée à former l'armature. Par ailleurs, pour remédier à cette sensibilité à la rayure, le document EP 0 580 557 propose un revêtement anti-adhésif comprenant une couche de matériau anti-adhésif qui présente une épaisseur discontinue et non constante. Une telle couche discontinue est appliquée sur une première couche continue et d'épaisseur constante sur l'ensemble de la surface du support . Cette couche discontinue est déposée au moins sur la partie centrale du fond de l'article culinaire selon un motif qui peut être irrégulier ou régulier, sous forme de réseau, de points ou d'éléments graphiques. Dans le cadre de cette dernière technique de réalisation, un inconvénient majeur se produit. La dernière couche du revêtement est formée par la couche discontinue qui crée en quelque sorte des zones de "relief". On observe qu'il se forme des craquelures sur la couche discontinue qui nuisent, dans le temps, à la qualité du revêtement, ce dernier perdant rapidement ses propriétés anti-adhésives . Le problême posé est de réaliser un article culinaire du type précité, qui remédie à l'ensemble des inconvénients mentionnés ci-dessus, cet article culinaire étant par conséquent doté d'un revêtement anti-adhésif présentant une résistance à la rayure améliorée et conservant ses propriétés d ' anti-adhérence dans le temps en évitant la formation de craquelures, tout en limitant la consommation de matière. Une solution au problème posé est un article culinaire formé d'un support métallique et d'un revêtement anti-adhésif déposé au moins sur la surface du support métallique constituant l'intérieur de l'article culinaire, le revêtement anti-adhésif comprenant au moins deux couches à base de résine fluorocarbonée, l'une des au moins deux couches, qui recouvre au moins la surface de sollicitation de l'intérieur de l'article culinaire, étant une couche discontinue formant des motifs. Suivant l'invention, toute coupe transversale de l'article culinaire, au moins au niveau de sa surface de sollicitation, présente des interruptions régulières dans le plan de la couche discontinue et chaque motif présente, en vue de dessus de l'intérieur de l'article culinaire, une surface d'au moins 1 mm2. La couche discontinue présente donc des motifs disposés de manière telle que des zones de déflexion limitent l'action des forces engendrées par des objets métalliques ou agressifs et ce, sans que ne se créent des zones de "relief" marquées. Dans une version avantageuse de l'invention, la composition de la couche discontinue formée des motifs comprend au moins une résine fluorocarbonée ainsi que des charges . La présence de charges dans la composition des motifs permet de renforcer la résistance de l'ensemble de la couche discontinue et, par conséquent, de renforcer la résistance globale du revêtement anti-adhésif de l'article culinaire . Dans le cas particulier où les charges comportent des pigments, on peut avantageusement réaliser un article culinaire dans lequel la couche discontinue forme un décor qui devient visible à travers le revêtement anti- adhésif, dans le cas où les couches du revêtement anti- adhésif situées au-dessus de la couche discontinue sont transparentes . Un tel décor, en particulier lorsqu'il est limité à la surface sollicitée de l'article culinaire, permet à l'utilisateur de positionner au mieux les denrées alimentaires en vue de leur cuisson sur ladite surface de cuisson de l'article culinaire. En outre, dans l'hypothèse où des rayures seraient malgré tout créées au niveau de la surface sollicitée de l'article culinaire, celles-ci seraient nettement moins visibles à l'œil nu grâce à l'aspect visuel conféré par le décor. D'autres avantages et particularités de l'invention résulteront de la description qui va suivre, faite en référence aux figures annexées : - la figure 1 représente une vue schématique du dessus d'un article culinaire conforme à l'invention, - la figure 2 représente une vue schématique en coupe transversale selon toute coupe transversale II-II de l'article culinaire de la figure 1, - la figure 3 représente une vue schématique agrandie en coupe transversale d'un autre mode de réalisation d'un article culinaire conforme à l'invention. Les éléments communs aux différentes figures sont repérés par des références identiques . Sur la figure 1, on a représenté une vue schématique du dessus d'un article culinaire 1. Cet article culinaire 1 comprend une zone centrale la, qui correspond à la surface de sollicitation de l'article culinaire 1, qui est celle apte à recevoir et à être en contact avec les aliments et donc avec des objets métalliques, et qui correspond pratiquement en général au fond le de l'article culinaire 1. Toutefois, cette surface de sollicitation la pourrait être plus grande que la surface du fond ou au contraire plus réduite. Par ailleurs, une couronne périphérique lb correspond au bord de l'article culinaire 1 et entoure ladite surface de sollicitation la. En référence à la figure 2, l'article culinaire 1 est formé d'un support métallique 2 et d'un revêtement anti-adhésif 3 déposé sur le support métallique 2. Le support métallique 2 est de manière courante réalisé en aluminium, en alliage d'aluminium, en acier inoxydable ou en titane. Le revêtement anti-adhésif 3 comprend au moins deux couches à base de résine fluorocarbonée, l'une des au moins deux couches, recouvrant au moins la surface de sollicitation la de l'intérieur de l'article culinaire 1, étant une couche discontinue 5 formant des motifs 6, 6'. Sur la figure 2, le revêtement anti-adhésif 3 comprend une première couche 4 continue et d'épaisseur constante, recouvrant l'ensemble de la surface intérieure ld du support métallique 2 et sur laquelle est déposée la couche discontinue 5 sur au moins la zone de la surface de sollicitation la, suivant un plan P3 parallèle au plan du fond P2, et dont les motifs 6, 6' sont séparés par des interruptions 9 dans le matériau constituant la couche discontinue 5. Dans un autre mode de réalisation, ces deux couches 4 et 5 peuvent être inversées, la couche discontinue 5 pouvant alors être située directement sur le support métallique 2 et, en toute hypothèse, sous la première coucheThe present invention relates to a culinary article comprising a non-stick coating deposited on a metal support, such as aluminum or aluminum alloy. The non-stick coatings commonly used to coat cookware are made from fluorocarbon resin, such as polytetrafluoroethylene (PTFE). If they are known for their non-stick properties as well as for their chemical and thermal resistance, PTFE-based coatings have the disadvantage of being particularly sensitive to scratching, in particular in the zone corresponding to the stressed surface. of the cookware. As a result, there is generally an early wear of cookware with this type of coating. To overcome this major drawback and obtain non-stick coatings with improved scratch resistance, various techniques have been developed, some of which have been the subject of patent applications such as those cited below: these techniques provide for a culinary article formed from a metallic support, a non-stick coating deposited on this metallic support and comprising at least two layers based on fluorocarbon resin, one of the at least two layers being a discontinuous layer forming patterns. Document EP 0 285 161 describes a coating comprising, from the metal support, a first layer disposed on said support and covered, if necessary, with a second layer of pure or charged PTFE. On this first, or second layer, is then deposited a third layer called "reinforcement". This frame is formed of oblong elements arranged in a network, the composition of which comprises PTFE and from 5 to 20% by weight, preferably from 10 to 15% by weight, of fillers, in particular of metallic or mineral powder. The frame is then covered with a final layer of pure or lightly loaded PTFE, which completely drowns the frame. The surface in contact with food is consequently flat and therefore does not include deflection zones making it possible to effectively deflect the forces generated by metallic objects. Such a coating still has a certain sensitivity to scratching. In addition, it consumes a significant amount of charged material intended to form the reinforcement. Furthermore, to remedy this sensitivity to scratching, document EP 0 580 557 proposes a non-stick coating comprising a layer of non-stick material which has a discontinuous and non-constant thickness. Such a discontinuous layer is applied to a first continuous layer of constant thickness over the entire surface of the support. This discontinuous layer is deposited at least on the central part of the bottom of the culinary article in a pattern which may be irregular or regular, in the form of a network, of dots or of graphic elements. In the context of this latter production technique, a major drawback occurs. The last layer of the coating is formed by the discontinuous layer which in a way creates "relief" zones. It is observed that cracks form on the discontinuous layer which, over time, adversely affects the quality of the coating, the latter rapidly losing its non-stick properties. The problem posed is to produce a cookware of the aforementioned type, which overcomes all of the drawbacks mentioned above, this cookware therefore being provided with a non-stick coating having improved scratch resistance and retaining its non-stick properties over time, avoiding the formation of cracks, while limiting the consumption of material. A solution to the problem posed is a culinary article formed by a metallic support and a non-stick coating deposited at least on the surface of the metallic support constituting the interior of the culinary article, the non-stick coating comprising at least two layers based on fluorocarbon resin, one of the at least two layers, which covers at least the stressing surface of the interior of the culinary article, being a discontinuous layer forming patterns. According to the invention, any cross section of the culinary article, at least at the level of its stressing surface, exhibits regular interruptions in the plane of the discontinuous layer and each pattern presents, in top view of the interior of the cookware, an area of at least 1 mm 2 . The discontinuous layer therefore has patterns arranged in such a way that deflection zones limit the action of the forces generated by metallic or aggressive objects, without creating marked "relief" zones. In an advantageous version of the invention, the composition of the discontinuous layer formed of the patterns comprises at least one fluorocarbon resin as well as fillers. The presence of fillers in the composition of the patterns makes it possible to reinforce the resistance of the entire discontinuous layer and, consequently, to reinforce the overall resistance of the non-stick coating of the culinary article. In the particular case where the fillers contain pigments, it is advantageously possible to produce a culinary article in which the discontinuous layer forms a decoration which becomes visible through the non-stick coating, in the case where the layers of the non-stick coating located at the - above the discontinuous layer are transparent. Such a decoration, in particular when it is limited to the stressed surface of the culinary article, allows the user to best position the foodstuffs for their cooking on said cooking surface of the culinary article. Furthermore, in the event that scratches are nevertheless created at the level of the stressed surface of the cookware, these would be much less visible to the naked eye thanks to the visual appearance imparted by the decor. Other advantages and particularities of the invention will result from the description which follows, given with reference to the appended figures: - Figure 1 shows a schematic view from above of a cooking utensil according to the invention, - Figure 2 shows a schematic cross-sectional view along any cross-section II-II of the culinary article of FIG. 1, FIG. 3 represents an enlarged schematic view in cross-section of another embodiment of a culinary article in accordance with the invention. The elements common to the different figures are identified by identical references. In FIG. 1, there is shown a schematic view from above of a culinary article 1. This culinary article 1 comprises a central zone la, which corresponds to the stressing surface of the culinary article 1, which is that suitable for receiving and to be in contact with food and therefore with metallic objects, and which corresponds practically in general to the bottom of the culinary article 1. However, this stressing surface la could be larger than the bottom surface or on the contrary more reduced. Furthermore, a peripheral crown 1b corresponds to the edge of the culinary article 1 and surrounds said biasing surface 1a. With reference to FIG. 2, the cookware 1 is formed of a metal support 2 and of a non-stick coating 3 deposited on the metal support 2. The metal support 2 is commonly made of aluminum, aluminum alloy, stainless steel or titanium. The non-stick coating 3 comprises at least two layers based on fluorocarbon resin, one of the at least two layers, covering at least the stressing surface 1a of the interior of the culinary article 1, being a discontinuous layer 5 forming patterns 6, 6 '. In FIG. 2, the non-stick coating 3 comprises a first continuous layer 4 of constant thickness, covering the entire interior surface ld of the metal support 2 and on which the discontinuous layer 5 is deposited on at least the area of the stressing surface la, along a plane P 3 parallel to the plane of the bottom P 2 , and the patterns 6, 6 'of which are separated by interruptions 9 in the material constituting the discontinuous layer 5. In another embodiment, these two layers 4 and 5 can be reversed, the discontinuous layer 5 can then be located directly on the metal support 2 and, in any event, under the first layer
4 continue et d'épaisseur constante. Le revêtement anti-adhésif 3 selon l'invention est tel que toute coupe transversale II-II, c'est-à-dire perpendiculaire au plan P2 défini par la surface du fond de l'article 1, que cette coupe transversale soit rectiligne, c'est-à-dire formée d'un unique segment de droite et ne pouvant donc pas être constituée par une ligne brisée, ou qu'elle soit courbe, présente des interruptions régulières 9 dans le plan P3 supérieur et parallèle à P2 de la couche discontinue 5, se traduisant d'une part par une épaisseur non constante du revêtement anti-adhésif 3 et d'autre part par un "décor" ne comportant aucune ligne rectiligne, courbe, parallèle ou sécante avec d'autres lignes. En outre, chaque motif 6, 6' présente, en vue de dessus de l'intérieur de l'article culinaire 1, une surface d'au moins 1 mm2. Une telle exigence de surface minimale permet de créer des zones de déflexion aptes à repousser l'action des forces engendrées par des objets métalliques. Cette valeur de surface minimale convient en outre pour une mise en œuvre industrielle. De préférence, la surface de chaque motif 6, 6' est comprise entre 1 et 10 mm2. Ces valeurs de surface permettent effectivement d'optimiser la cohésion de la couche discontinue 5 avec les autres couches formant le revêtement anti-adhésif, et notamment avec la première couche 4 continue et' d'épaisseur constante. On limite ainsi très nettement le risque de formation de craquelures à l'endroit ou, de manière plus générale, au voisinage des motifs 6, 6' . Ce phénomène de cohésion entre les couches est encore renforcé par la forme conférée aux motifs 6, 6', en particulier lorsqu'ils présentent une figure géométrique simple telle que points, cercles, polygones réguliers ou irréguliers, etc. Dans une version avantageuse de l'invention, la proportion de surface recouverte par le "décor" constitué par l'ensemble des motifs 6, 6' est supérieure à 15% de la surface totale sollicitée la de l'article culinaire 1. Plus préférentiellement , cette proportion de surface recouverte par l'ensemble des motifs 6, 6' est comprise entre 15 et 40% de la zone centrale la formant la surface totale sollicitée de l'article culinaire 1. Les motifs 6, 6' peuvent être appliqués par tout moyen classique couramment utilisé pour l'application des revêtements anti-adhésifs à base de résine fluorocarbonée. A titre d'exemple non limitatif, on peut citer l'application par sérigraphie, par tampographie, par rouleau ou encore l'application au rideau. Toutefois, pour des raisons d'économie de matière, la couche discontinue 5 formée et constituant les motifs 6, 6' est préférentiellement appliquée par sérigraphie, notamment lorsque l'opération d'emboutissage est réalisée après formation du revêtement anti-adhésif 3 sur le support métallique 2 plan. Dans le cas où le revêtement anti-adhésif 3 est formé sur le support métallique 2 préalablement embouti selon la forme finale choisie pour l'article culinaire 1, un mode d'application par tampographie est préférentiellement envisagé . La composition de la couche discontinue 5 constituant les motifs 6, 6' comprend au moins une résine fluorocarbonée . Les résines fluorocarbonées convenant pour la composition de la première couche 4 et de la couche discontinue 5 sont notamment décrites dans le document US 5,536,583. On citera plus préférentiellement le polytétrafluoroéthylêne (PTFE) , pur ou en combinaison avec un copolymère de tétrafluoroéthylêne et de perfluoropropylvinyléther (PFA) . La composition de la couche discontinue 5 formant les motifs 6, 6' comprend en outre des pigments, visant à conférer une couleur aux dits motifs 6, 6'. A titre d'exemples non limitatifs, on peut envisager d'utiliser un ou plusieurs pigments choisis parmi le noir de fumée, l'oxyde de titane Ti02, les paillettes de mica ou les paillettes de silice, lesdites paillettes étant recouvertes par des oxydes métalliques. Parmi les oxydes métalliques, on peut citer l'oxyde de titane Ti02 ou l'oxyde de fer Fe203. Rien n'interdit toutefois d'envisager l'emploi de pigments thermochromiques, et notamment l'oxyde de fer Fe203 et/ou le rouge de pérylène, décrits dans le document WO 00/22395. Plus préférentiellement, la proportion pondérale des pigments est déterminée en fonction de l'aptitude à couvrir des dits pigments. Cette proportion pondérale est couramment comprise entre 0,5 à 15% de la composition de la couche discontinue 5 formant les motifs 6, 6'. Cette proportion pondérale peut être réduite pour être comprise entre 0,5 et 7,5% de la composition de la couche discontinue 5, en particulier lorsque l'on utilise des pigments sous forme de paillettes, et/ou lorsque l'on envisage une application par sérigraphie de cette couche discontinue 5. Sur la figure 3, on a représenté un revêtement anti-adhésif 7 formé de trois couches, la première couche 4 et la couche discontinue 5 étant similaires à celles représentées à la figure 2. La couche discontinue 5 est recouverte par au moins une couche de finition 8, également à base de résine fluorocarbonée telle que décrite ci-dessus. On pourrait tout à fait envisager le dépôt d'une ou plusieurs autres couches de finition au-dessus de la couche de finition 8 de la figure 3. Lorsque l'on utilise des pigments colorés dans la composition des motifs 6, 6' de la couche discontinue 5 et que la couche de finition 8 est transparente, les motifs4 continuous and of constant thickness. The non-stick coating 3 according to the invention is such that any cross section II-II, that is to say perpendicular to the plane P 2 defined by the bottom surface of the article 1, that this cross section is straight , that is to say formed of a single line segment and therefore not able to be constituted by a broken line, or that it is curved, has regular interruptions 9 in the plane P 3 higher and parallel to P 2 of the discontinuous layer 5, resulting on the one hand in a non-constant thickness of the non-stick coating 3 and on the other hand by a "decoration" comprising no rectilinear, curved, parallel or intersecting line with other lines. In addition, each pattern 6, 6 'has, in top view of the interior of the culinary article 1, an area of at least 1 mm 2 . Such a minimum surface requirement makes it possible to create deflection zones capable of repelling the action of the forces generated by metallic objects. This minimum surface value is also suitable for industrial use. Preferably, the surface of each pattern 6, 6 ′ is between 1 and 10 mm 2 . These surface values effectively make it possible to optimize the cohesion of the discontinuous layer 5 with the other layers forming the non-stick coating, and in particular with the first continuous layer 4 of constant thickness. This very clearly limits the risk of the formation of cracks in the place or, more generally, in the vicinity of the patterns 6, 6 '. This phenomenon of cohesion between the layers is further reinforced by the shape given to the patterns 6, 6 ′, in particular when they have a simple geometrical figure such as points, circles, regular or irregular polygons, etc. In an advantageous version of the invention, the proportion of surface covered by the "decoration" consisting of all of the patterns 6, 6 'is greater than 15% of the total surface area applied to of the culinary article 1. More preferably , this proportion of surface covered by all of the patterns 6, 6 ′ is between 15 and 40% of the central zone forming it the total stressed surface of the culinary article 1. The patterns 6, 6 'can be applied by any conventional means commonly used for the application of non-stick coatings based on fluorocarbon resin. By way of nonlimiting example, mention may be made of application by screen printing, pad printing, by roller or even curtain application. However, for reasons of economy of material, the discontinuous layer 5 formed and constituting the patterns 6, 6 ′ is preferably applied by screen printing, in particular when the stamping operation is carried out after formation of the non-stick coating 3 on the 2-plane metal support. In the case where the non-stick coating 3 is formed on the metal support 2 previously stamped according to the final shape chosen for the culinary article 1, a method of application by pad printing is preferably envisaged. The composition of the discontinuous layer 5 constituting the patterns 6, 6 ′ comprises at least one fluorocarbon resin. The fluorocarbon resins suitable for the composition of the first layer 4 and of the discontinuous layer 5 are in particular described in document US 5,536,583. Mention will more preferably be made of polytetrafluoroethylene (PTFE), pure or in combination with a copolymer of tetrafluoroethylene and perfluoropropylvinylether (PFA). The composition of the discontinuous layer 5 forming the patterns 6, 6 'further comprises pigments, aimed at imparting a color to the said patterns 6, 6'. By way of nonlimiting examples, it is possible to envisage using one or more pigments chosen from smoke black, titanium oxide Ti0 2 , mica flakes or silica flakes, said flakes being covered with oxides metal. Among the metal oxides, mention may be made of titanium oxide Ti0 2 or iron oxide Fe 2 0 3 . However, there is nothing to prevent the use of thermochromic pigments, and in particular iron oxide Fe 2 0 3 and / or perylene red, described in document WO 00/22395. More preferably, the weight proportion of the pigments is determined as a function of the ability to cover said pigments. This weight proportion is commonly between 0.5 to 15% of the composition of the discontinuous layer 5 forming the patterns 6, 6 '. This weight proportion can be reduced to be between 0.5 and 7.5% of the composition of the discontinuous layer 5, in particular when pigments in the form of flakes are used, and / or when a application by screen printing of this discontinuous layer 5. In FIG. 3, a non-stick coating 7 is shown formed of three layers, the first layer 4 and the discontinuous layer 5 being similar to those shown in FIG. 2. The discontinuous layer 5 is covered by at least one finishing layer 8, also based on fluorocarbon resin as described above. One could completely envisage the deposition of one or more other finishing layers above the finishing layer 8 of FIG. 3. When using colored pigments in the composition of the patterns 6, 6 ′ of the discontinuous layer 5 and the finishing layer 8 is transparent, the patterns
6, 6' de la couche discontinue 5 forment un décor qui est visible à travers la couche de finition 8. En fonction du choix de couleur retenu pour les pigments, on peut avantageusement diminuer la perception du jaunissement éventuel qui pourrait se former à l'usage au niveau du revêtement anti-adhésif 3, 7. On peut tout à fait envisager de réaliser un article culinaire comportant un revêtement conforme à la présente invention et comprenant en outre, dans la couche discontinue 5 ou dans une autre couche, dans la première couche 4 continue et d'épaisseur constante ou dans toute autre couche supplémentaire, un décor à base de résine fluorocarbonée et comprenant au moins une substance chimique qui change de couleur de manière réversible en fonction de la température. Un décor conforme à la définition ci-dessus a notamment été décrit dans la demande WO 00/22395 au nom de la demanderesse. 6, 6 ′ of the discontinuous layer 5 form a decoration which is visible through the finishing layer 8. Depending on the choice of color retained for the pigments, it is advantageous to reduce the perception of possible yellowing which could form on use at the level of the non-stick coating 3, 7. It is entirely possible to envisage producing a culinary article comprising a coating in accordance with the present invention and further comprising, in the discontinuous layer 5 or in another layer, in the first layer 4 continuous and of constant thickness or in any other additional layer, a decoration based on fluorocarbon resin and comprising at least one chemical substance which changes color reversibly as a function of temperature. A decoration conforming to the above definition has in particular been described in application WO 00/22395 in the name of the applicant.

Claims

REVENDICATIONS
1. Article culinaire (1) formé d'un support métallique (2) et d'un revêtement anti-adhésif (3) déposé au moins sur la surface du support métallique constituant l'intérieur (ld) de l'article culinaire (1), le revêtement anti-adhésif (3) comprenant au moins deux couches à base de résine fluorocarbonée, l'une des au moins deux couches recouvrant au moins la surface de sollicitation (la) de l'intérieur de l'article (1) étant une couche discontinue (5) formée de motifs (6, 6'), caractérisé en ce que toute coupe transversale (II-II) de l'article culinaire (1), au moins au niveau de sa surface de sollicitation (la) , présente des interruptions régulières (9) dans le plan (P3) de la couche discontinue (5) et en ce que chaque motif (6, 6') présente, en vue de dessus de l'intérieur de l'article culinaire (1), une surface d'au moins 1 mm2.1. Culinary article (1) formed by a metallic support (2) and a non-stick coating (3) deposited at least on the surface of the metallic support constituting the interior (ld) of the culinary article (1 ), the non-stick coating (3) comprising at least two layers based on fluorocarbon resin, one of the at least two layers covering at least the stressing surface (la) of the interior of the article (1) being a discontinuous layer (5) formed of patterns (6, 6 '), characterized in that any transverse section (II-II) of the culinary article (1), at least at its stress surface (la) , has regular interruptions (9) in the plane (P 3 ) of the discontinuous layer (5) and in that each pattern (6, 6 ') has, in top view of the interior of the cookware ( 1), an area of at least 1 mm 2 .
2. Article culinaire selon la revendication 1, caractérisé en ce que la surface de chaque motif (6, 6') est comprise entre 1 et 10 mm2.2. Culinary article according to claim 1, characterized in that the surface of each pattern (6, 6 ') is between 1 and 10 mm 2 .
3. Article culinaire selon la revendication 1 ou 2, caractérisé en ce que la proportion de surface recouverte par l'ensemble des motifs (6, 6') est supérieure à 15%, et de préférence comprise entre 15 et 40%, de la surface totale sollicitée (la) de l'article culinaire (1) .3. Culinary article according to claim 1 or 2, characterized in that the proportion of surface covered by all of the patterns (6, 6 ') is greater than 15%, and preferably between 15 and 40%, of the total requested surface area (la) of the cookware (1).
4. Article culinaire selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la couche discontinue (5) formée des motifs (6, 6') est appliquée par sérigraphie ou par tampographie. 4. Culinary article according to any one of claims 1 to 3, characterized in that the discontinuous layer (5) formed of patterns (6, 6 ') is applied by screen printing or pad printing.
5. Article culinaire selon l'une quelconque des revendications 1 à 4, caractérisé en ce que la composition de la couche discontinue (5) formée des motifs (6, 6') comprend au moins une résine fluorocarbonée et, en outre, des pigments, qui peuvent notamment être thermochromiques.5. Culinary article according to any one of claims 1 to 4, characterized in that the composition of the discontinuous layer (5) formed of the patterns (6, 6 ') comprises at least one fluorocarbon resin and, in addition, pigments, which can in particular be thermochromic.
6. Article culinaire selon la revendication 5, caractérisé en ce que les pigments comprennent au moins un élément choisi parmi le noir de fumée, l'oxyde de titane Ti02, l'oxyde de fer Fe203, le rouge de pérylène, les paillettes de mica ou les paillettes de silice, lesdites paillettes étant recouvertes par des oxydes métalliques.6. Culinary article according to claim 5, characterized in that the pigments comprise at least one element chosen from smoke black, titanium oxide Ti0 2 , iron oxide Fe 2 0 3 , perylene red, mica flakes or silica flakes, said flakes being covered with metal oxides.
7. Article culinaire selon la revendication 6, caractérisé en ce que les oxydes métalliques sont l'oxyde de titane Ti02 et/ou de l'oxyde de fer Fe203.7. Culinary article according to claim 6, characterized in that the metal oxides are titanium oxide Ti0 2 and / or iron oxide Fe 2 0 3 .
8. Article culinaire selon l'une quelconque des revendications 5 à 7, caractérisé en ce que la proportion pondérale des pigments est comprise entre 0,5 et 15%, avantageusement entre 0,5 à 7,5%, de la composition de la couche discontinue (5) formée des motifs (6, 6') .8. Culinary article according to any one of claims 5 to 7, characterized in that the weight proportion of the pigments is between 0.5 and 15%, advantageously between 0.5 to 7.5%, of the composition of the discontinuous layer (5) formed of patterns (6, 6 ').
9. Article culinaire selon l'une quelconque des revendications 5 à 8, caractérisé en ce que les motifs (6, 6') de la couche discontinue (5) forment un décor qui est visible à travers le revêtement anti-adhésif (3) .9. Culinary article according to any one of claims 5 to 8, characterized in that the patterns (6, 6 ') of the discontinuous layer (5) form a decoration which is visible through the non-stick coating (3) .
10. Article culinaire selon l'une quelconque des revendications 1 à 9, caractérisé en ce qu'il comprend en outre un décor à base de résine fluorocarbonée et comprenant au moins une substance chimique qui change de couleur de manière réversible en fonction de la température. 10. Culinary article according to any one of claims 1 to 9, characterized in that it further comprises a decoration based on fluorocarbon resin and comprising at least one chemical substance which changes color reversibly as a function of temperature .
EP05746686A 2004-03-30 2005-03-30 Cookware exhibiting an improved scratch resistance Withdrawn EP1729618A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0403291A FR2868276B1 (en) 2004-03-30 2004-03-30 CULINARY ARTICLE HAVING ENHANCED SCRATCH RESISTANCE
PCT/FR2005/000775 WO2005094645A1 (en) 2004-03-30 2005-03-30 Cookware exhibiting an improved scratch resistance

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US (1) US20080237241A1 (en)
EP (1) EP1729618A1 (en)
JP (1) JP2007530199A (en)
KR (1) KR20070032638A (en)
CN (1) CN1937944B (en)
CA (1) CA2560685A1 (en)
FR (1) FR2868276B1 (en)
MX (1) MXPA06011077A (en)
RU (1) RU2359601C2 (en)
WO (1) WO2005094645A1 (en)

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US20080237241A1 (en) 2008-10-02
JP2007530199A (en) 2007-11-01
KR20070032638A (en) 2007-03-22
WO2005094645A1 (en) 2005-10-13
CN1937944B (en) 2010-05-05
CA2560685A1 (en) 2005-10-13
FR2868276A1 (en) 2005-10-07
RU2359601C2 (en) 2009-06-27
CN1937944A (en) 2007-03-28
RU2006134337A (en) 2008-05-10
FR2868276B1 (en) 2006-05-26

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