Enamelled and anodised article of cookware and method to manufacture same
AssigneeSeb S.A.
InventorsPascal Cuillery, Jean-François Brassett, Fabrice Parsent, Pierre-Jean Muller
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Abstract
The invention relates to a culinary item comprising a dished body defining a bottom and a lateral wall, and provided with an inner surface for receiving food and an outer surface for positioning next to the heat source, at least one of the surfaces of the lateral wall being covered by an anodising layer and the outer surface of the bottom being at least partially enamelled. The invention also relates to a method for producing one such item.
Claims26
Article of cookware (1, 10) comprising a hollow bowl defining a bottom (3, 30) and a side wall (4, 40) rising from said bottom (3, 30), said bowl having an inner face (1a) capable of receiving foods and an outer face (1b, 10b) intended to be arranged on the side of the heat source, said dish comprising an aluminium or aluminium alloy sheet (5),
- characterised in that the outer face (1b, 10b) at least of the side wall (4, 40) is made of anodised aluminium or anodised aluminium alloy,
- in that and the outer face (1b, 10b) of the bottom (3, 30) is coated at least partly with an enamel layer (8, 80) having a substantially uniform thickness wherein the mean value is between 15 and 40 μm, with a deviation with respect to said mean thickness value of not more than 10%, and
- in that said enamel layer (8, 80) comprises 1.5 to 9% by weight with respect to the total weight of the enamel layer of at least one molten element selected from the group consisting of lead oxide PbO, bismuth oxide Bi2O3 and vanadium pentoxide V2O5.
Method to manufacture an article of cookware (1, 10) comprising a bottom (3, 30) and a side wall (4, 40) rising from the bottom (3, 30) made of aluminium or aluminium alloy, said method comprising the following steps:
- a) shaping, by means of embossing, of an aluminium or aluminium alloy sheet (5) to give it the final shape of the article of cookware (1, 10) and thus define the inner face (1a) of the article of cookware (1, 10), intended for cooking food, and the outer face (1b, 10b) of the article of cookware (1, 10) intended to be arranged on the side of the heat source;
- b) an enamel layer (8, 80) production step on all or part of the outer face (1b, 10b) of the bottom (3, 30) of the article of cookware (1, 10), and
- c) an anodising step c) of the article of cookware (1, 10),
- said method being characterised in that said enamel layer (8, 80) production step b) is performed before the anodising step and represents the only enamelling step of the outer face of the bottom of the article of cookware according to the invention, said step b) comprising the following successive steps:
- i) preparation of an anhydrous paste from a powdery enamel frit comprising 0.82 to 6.75% by weight with respect to the total weight of the paste of at least one molten element selected from the group consisting of lead oxide PbO, bismuth oxide Bi2O3 and vanadium pentoxide V2O5, said paste being formulated in the form of a dispersion in a non-aqueous medium;
- ii) application of the anhydrous paste on said outer face (1b, 10b) of the bottom (3, 30) in at least one layer of paste;
- iii) firing of the layer of paste at a temperature between 540° C. and 575° C. to form an enamel layer (8, 80) having after firing a substantially uniform thickness wherein the mean value is between 15 and 40 μm with a deviation with respect to said mean thickness value of not more than 10%.
Dependencies are inferred from the claim text.