Classifications

• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
  • A47J27/00—Cooking-vessels
  • A47J27/002—Construction of cooking-vessels; Methods or processes of manufacturing specially adapted for cooking-vessels
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
  • A47J36/00—Parts, details or accessories of cooking-vessels
  • A47J36/02—Selection of specific materials, e.g. heavy bottoms with copper inlay or with insulating inlay
  • A47J36/025—Vessels with non-stick features, e.g. coatings
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
  • A47J45/00—Devices for fastening or gripping kitchen utensils or crockery
  • A47J45/06—Handles for hollow-ware articles
  • A47J45/061—Saucepan, frying-pan handles
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
  • B05D3/002—Pretreatement
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
  • B05D3/12—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by mechanical means
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
  • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D51/00—Making hollow objects
  • B21D51/16—Making hollow objects characterised by the use of the objects
  • B21D51/18—Making hollow objects characterised by the use of the objects vessels, e.g. tubs, vats, tanks, sinks, or the like
  • B21D51/22—Making hollow objects characterised by the use of the objects vessels, e.g. tubs, vats, tanks, sinks, or the like pots, e.g. for cooking
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
  • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D2350/00—Pretreatment of the substrate
  • B05D2350/30—Change of the surface
  • B05D2350/50—Smoothing
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
  • B23P2700/00—Indexing scheme relating to the articles being treated, e.g. manufactured, repaired, assembled, connected or other operations covered in the subgroups
  • B23P2700/05—Cooking vessels
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S220/00—Receptacles
  • Y10S220/912—Cookware, i.e. pots and pans

Definitions

• the present invention relates to the technical field of cooking vessels having a partially coated stainless steel inner face.
• the present invention relates more particularly to cooking vessels obtained by stamping from a stainless steel sheet or from a multilayer sheet having at least one outer layer of stainless steel, and to their method of obtaining.
• the present invention relates in particular to cookware intended to be arranged on a firebox, such as for example stoves or pans.
• the present invention also relates to tanks for electric cooking appliances, in particular but not exclusively removable tanks.
• Document KR100804387B1 discloses a cooking vessel having a partially coated stainless steel inner face.
• the inner face has a plurality of recesses whose bottom bears a non-stick coating.
• the inner face has ribs interposed between the recesses.
• the uncoated peaks of the ribs rise above the nonstick coating covering the bottom of the hollows.
• the ribs have uncoated side faces rising above the bottom of the recesses.
• the lateral faces of the ribs are perpendicular to the bottom of the hollows.
• An object of the present invention is to provide a cooking vessel having a cooking surface combining ease of cleaning and durability, even when used with utensils made of hard material, such as for example metal utensils.
• Another object of the present invention is to provide a method for obtaining a cooking vessel having a cooking surface combining easy cleaning and durability, even when used with utensils made of hard material, such as by example of metal utensils.
• a cooking vessel having a container body having a textured inner surface of partially coated stainless steel, the textured interior surface having a plurality of ribs rising above recesses, the recesses having coated bases.
• a non-stick coating the ribs having uncoated tops and distinct sides of the bottoms of the depressions, the sides of the ribs connecting the tops of the ribs to the bottoms of the depressions, the tops of the ribs rising above the non-stick coating covering the bottoms; hollows, because the non-stick coating rises on the sides of the ribs from the bottoms of the hollows towards the vertices of the ribs, without exceeding the height of the peaks, and that the bottoms of the hollows and sides of the ribs are rough surface under the non-stick coating, to promote the attachment of the non-stick coating.
• the sides of the ribs form ramps connecting the tops of the ribs to the bottoms of the hollows. This provision allows promote the holding of the coating on the sides of the ribs.
• the thickness of the non-stick coating is greater on the lower part of the sides of the ribs than on the upper part of the sides of the ribs.
• the width of the vertices of the ribs is less than the distance between the vertices of two adjacent ribs. This arrangement makes it possible to obtain a textured interior surface having a larger coated surface than the uncoated metal surface of the peaks of the ribs.
• the width of the vertices of the ribs is less than the width of the bottoms of the recesses extending between two adjacent ribs. This arrangement makes it possible to obtain a textured interior surface having an even larger surface area.
• the sides of the ribs rise relative to the bottom of the recesses with an angle less than 45 °, and preferably with an angle of between 20 ° and 40 °.
• This arrangement makes it easier to make the ribs.
• This arrangement also improves the attachment of the coating on the sides of the ribs.
• the vertices of the ribs are planar. This arrangement facilitates the movement of the cooking utensils on the ribs, to stir, separate or serve food. This arrangement also facilitates the realization of the vertices of the ribs. If desired, the tops of the ribs can be polished, which reduces the attachment of food.
• the ribs have a trapezoidal section. This arrangement makes it easier to make the ribs.
• the engraving depth defined between the peaks of the ribs and the bottoms of the hollows is between 0.05 mm and 0.2 mm. This arrangement makes it possible to obtain a cooking vessel having good properties of use, with an embodiment that remains easy.
• the release liner has an outer layer of PTFE.
• the release liner has an outer layer of ceramic gel sol.
• the container body can be made of stainless steel.
• an aluminum heat diffusion plate partially covers the outer face of the cooking vessel, for a good distribution of heat.
• a bottom plate of stainless steel covers the thermal diffusion plate.
• the bottom plate is made of ferritic stainless steel to allow induction heating of the cooking vessel.
• the container body may also be made of multilayer material comprising at least one outer layer of stainless steel.
• the cooking vessel comprises at least one handle mounted on the container body.
• the ribs are interconnected and delimit separate depressions. This arrangement facilitates the movement of the cooking utensils on the ribs, to stir, separate or serve food.
• the method consists in hot knocking a bottom plate made of ferritic stainless steel on the face of the diffuser bottom opposite the cap, during hot striking of the diffuser base on the outer face of the cap, to allow heating by induction of the cooking vessel.
• Engraving of the screening may in particular be carried out by striking, preferably by hot stamping, or by laser etching.
• Engraving of the screening may in particular be carried out by striking, preferably by hot stamping, or by laser etching.
• a polishing of the tops of the ribs is performed before the coating of the release coating, to limit the adhesion of the release coating on the tops of the ribs.
• FIG. 1 is a diagrammatic top view of an embodiment of a cooking vessel according to the invention, FIG. 1a being an enlarged partial view of the inside face of the cooking vessel shown in FIG. Figure 2 is a partial sectional view of the cooking vessel illustrated in Figures 1 and 1a,
• Figures 3 to 8 schematically illustrate the steps of a first embodiment of a method for obtaining a cooking vessel, according to the invention
• Figure 3 is a schematic sectional view of a steel flank
• Figure 4 is a schematic cross-sectional view of the sidewall shown in Figure 3, after stamping
• - Figure 5 is a schematic sectional view of the drawn flank shown in Figure 4, after assembly of a diffuser base reported on the outer face of the bottom of the sidewall and etching of the bottom of the internal face of the sidewall, FIG. 5a being an enlarged partial view of the upper part of the bottom of the internal face of the sidewall shown in FIG. 5;
• FIG. 5a being an enlarged partial view of the upper part of the bottom of the internal face of the sidewall shown in FIG. 5;
• FIG. 7 is a diagrammatic sectional view of the sanded stamped side shown in FIG. 6, after making a coating on the bottom of the internal face of the sidewall, FIG. 7a being an enlarged partial view of the upper part of the bottom of the internal face of the sidewall shown in FIG. 7,
• FIG. 8 is a diagrammatic sectional view of the coated sanded embossed flank shown in FIG. 7, after brushing and / or polishing the peaks of the ribs formed on the bottom of the internal face of the sidewall, FIG. 8a being an enlarged partial view of the upper part of the bottom of the internal face of the sidewall shown in FIG. 8,
• FIGS. 9 to 14 schematically illustrate the steps of a second embodiment of a method for obtaining a cooking vessel, according to the invention
• FIG. 9 is a diagrammatic sectional view of a three-sided flank; layers having at least one outer face of stainless steel, the three layers being shown in Figure 9a illustrating a portion of the sidewall shown in Figure 9,
• FIG. 10 is a diagrammatic sectional view of the sidewall shown in FIG. 9, after etching of a portion of the internal face of the sidewall, FIG. 10a being an enlarged partial view of the upper part of the internal face of the sidewall shown on FIG. Figure 10
• FIG. 11 is a diagrammatic cross-sectional view of the etched side shown in FIG. 10, after stamping,
• FIG. 12 is a diagrammatic cross-sectional view of the engraved embossed flank represented in FIG. 11, after sanding of the bottom of the internal face of the sidewall, FIG. 12a being an enlarged partial view of the upper part of the bottom of the internal face of the FIG. 13 is a diagrammatic sectional view of the sandblasted stamped embossed side shown in FIG. 12, after making a coating on the bottom of the internal face of the sidewall, FIG. 13a being a partial view. enlarged of the upper part of the bottom of the internal face of the sidewall shown in FIG. 13, FIG. 14 is a diagrammatic cross-sectional view of the coated sanded embossed sidewall shown in FIG.
• FIG. 15 is a diagrammatic cross-sectional view of a three-layered flank having at least one stainless steel outer face, the three layers being shown in FIG. 15a illustrating a portion of the sidewall shown in FIG. 16 is a diagrammatic sectional view of the sidewall shown in FIG. 15, after stamping,
• FIG. 17 is a diagrammatic cross-sectional view of the drawn flank shown in FIG. 16, after etching of a portion of the internal face of the flank, FIG. 17a being an enlarged partial view of the upper portion of the internal face of the sidewall shown.
• FIG. 18 is a diagrammatic cross-sectional view of the engraved embossed side shown in FIG. 17, after sanding of the bottom of the internal face of the sidewall, FIG. 18a being an enlarged partial view of the upper part of the bottom of the sidewall.
• FIG. 19 is a diagrammatic cross-sectional view of the embossed etched sidewall shown in FIG. 19, after making a coating on the bottom of the internal face of the sidewall, FIG. 19a.
• FIG. 20 is a diagrammatic sectional view of the coated sanded sidewall coated represented in FIG. 19, after brushing and / or polishing the peaks of the ribs formed on the bottom of the internal face of the sidewall, FIG. 20a being an enlarged partial view of the upper part of the bottom of the internal face of the sidewall shown in FIG.
• Figure 1 illustrates an embodiment of a cooking vessel 1 having a container body 2 having a textured inner surface 3 of partially coated stainless steel.
• the textured interior face 3 forms a cooking surface.
• the textured inner face 3 is surrounded by a non-textured inner face 4.
• the non-textured inner face 4 may be coated or uncoated.
• the uncoated inner surface 4 coated preferably has the same coating as the textured inner side 3.
• the uncoated non-textured inner surface 4 is preferably made of polished stainless steel.
• the textured inner face 3 extends on a flat portion forming the bottom of the container body 2, and the non-textured inner face 4 extends on a side wall rising to from the bottom of the container body 2.
• the cooking vessel 1 may in particular be a pan or a pan, or a pan of cooking appliance with a flat bottom.
• the textured inner face 3 may extend at least partially on the sidewall rising from the bottom of the container body 2.
• the container body 2 then does not necessarily have a non-textured inner surface 4
• the textured inner surface 3 can thus cover the entire interior of the cooking vessel.
• the bottom of the container body 2 is not necessarily planar.
• the cooking vessel 1 can then be in particular a wok, or a bowl of cooking appliance concave bottom.
• the cooking vessel 1 has a handle 5 mounted on the container body 2. If desired, the cooking vessel 1 may comprise at least one other handle mounted on the container body 2.
• container body 2 illustrated in Figure 1 has a circular geometry. AT alternatively, the container body 2 may have other geometries, including an oval or elliptical geometry.
• the container body 2 can be made from a stainless steel side 20, illustrated in FIG. 3.
• the stainless steel is of the austenitic type, in particular a stainless steel of the type 304, or ferritic type, including a type 441 stainless steel.
• the container body 2 then advantageously has a bottom diffuser 8 reported made of good thermal conductive material (aluminum alloy, copper, ...), 5.
• the added diffuser base 8 may be disposed between the container body 2 and a bottom plate 9 made preferably of ferritic stainless steel, to allow induction heating of the cooking vessel 1.
• the container body 2 can be made from a sidewall 30; 40 multilayer having at least one outer face 30a; 40a stainless steel, shown in Figures 9 and 15.
• the outer face 30a; 40a of stainless steel is provided to form the inner face of the container body 2.
• the outer face 30a; 40a of stainless steel is preferably made of austenitic stainless steel, for example austenitic steel type 304.
• the flank 30; 40 has a heart 30b; 40b in good heat conductor material or formed by an assembly of good thermal conductive materials (aluminum alloy, copper, ).
• the flank preferably comprises another external face 30c; 40c made of ferritic stainless steel, to allow induction heating of the cooking vessel 1.
• the textured interior face 3 of the container body 2 has a plurality of ribs 10.
• the ribs 10 form a framing of the textured inner face 3.
• the ribs 10 rise above the recesses 15.
• the recesses 15 have funds 16 covered with a coating anti-adhesive 7.
• the ribs 10 have unpainted peaks 1 January.
• the ribs 10 have distinct sides 12 of the bottoms 16 of the recesses 15. In other words, the sides 12 of the ribs 10 rise above the bottoms 16 of the recesses 15.
• the vertices 1 1 of the ribs 10 are above the non-stick coating 7 covering the bottoms 16 of the recesses 15.
• the sides 12 of the ribs 10 connect the vertices 1 1 of the ribs 10 to the bottoms 16 of the recesses 15.
• the non-stick coating 7 rises on the sides 12 of the ribs 10 from bottoms 16 of the recesses 15 towards the vertices 1 1 of the ribs 10, without exceeding the height of the vertices 1 1.
• the uncoated peaks 1 1 form a bearing surface for carrying a kitchen utensil used to stir, separate or serve food, such as for example a spatula.
• the non-stick coating 7 covering the recesses 15 is protected from the movements of the spatula by the vertices 1 1 of the ribs 10.
• the ribs 10 are preferably distributed on the inside textured face 3 of the container body 2 so that the distance between the vertices 1 1 of two ribs 10 adjacent or even adjacent, is less than or equal to 2 cm, regardless of the selected orientation.
• the fineness of the width of the tips 1 1 of the ribs 10 minimizes the contact between the food and the surfaces made of stainless steel, and thus to promote the ease of cleaning of the cooking surface.
• the width of the vertices 1 1 defined by their smaller surface dimension is advantageously between 100 ⁇ and 2 mm.
• the textured inner face 3 comprises a stainless steel grid.
• the grid is formed by the vertices 1 1 of the ribs 10, visible in Figure 2.
• the ribs 10 are interconnected and delimit separate depressions 15. In other words, the ribs 10 separate the recesses 15.
• the ribs 10 thus form a continuous mesh.
• the interstices of the grid are filled by the non-stick coating 7.
• the ribs 10 extend in two perpendicular directions and form a mesh of square geometry.
• the stainless steel grid formed by the vertices 1 1 of the ribs 10 provides a protective function of the non-stick coating 7.
• the stainless steel grid may have a polygonal mesh (for example square, rectangle, triangle, diamond, hexagon) or elliptically shaped (for example circles or ellipses juxtaposed).
• the surface of the mesh (whatever its shape) is preferably between 0.25 mm 2 and 1 cm 2 .
• the ratio between the area defined by the grid and the total area (for the area concerned by the presence of the grid) is between 0.02 and 0.25.
• the vertices 1 1 of the ribs 10 constitute between 2% and 25% of the cooking surface.
• two adjacent ribs 10 are not necessarily aligned or perpendicular.
• the mesh is not necessarily continuous. At least some troughs 15 could be interconnected. At least some of the ribs 10 could be surrounded by depressions 15.
• the bottoms 16 of the recesses 15 and the sides 12 of the ribs 10 have a rough surface 6 under the non-stick coating 7, in order to promote the adhesion of the non-stick coating 7.
• the width of the vertices 1 1 of the ribs 10 is less than the width of the bottoms 16 of the recesses 15 extending between two adjacent ribs 10.
• the vertices 1 1 of the ribs 10 are planar.
• the ribs 10 have a trapezoidal section.
• the sides 12 of the ribs 10 form ramps connecting the vertices 1 1 of the ribs 10 to the bottoms 16 of the recesses 15.
• the sides 12 of the ribs 10 are inclined and form slopes rising from the bottoms 16 of the recesses 15.
• the non-stick coating 7 covering the bottoms 16 of the recesses 15 can be raised progressively to cover the sides 12 of the ribs 10.
• the thickness of the non-stick coating 7 is greater on the lower part of the sides 12 of the ribs 10 than on the upper part of the sides 12 of the ribs 10
• the sides 12 of the ribs 10 rise relative to the bottoms 16 of the recesses 15 with an angle less than 45 °.
• the angle a is between 20 ° and 40 °.
• the engraving depth defined between the vertices 1 1 of the ribs 10 and the bottoms 16 of the recesses 15 is preferably between 0.05 mm and 0.2 mm.
• the targeted etching depth is for example of the order of 0.1 mm.
• the sides 12 of the ribs 10 are covered by the non-stick coating 7; the vertices 1 1 of the ribs 10 are devoid of non-stick coating 7.
• the nonstick coating 7 may be selected from different types.
• the release liner 7 has an outer layer of PTFE (PolyTetrafluoroethylene).
• the non-stick coating 7 has an outer layer of ceramic gel sol.
• At least one intermediate layer may be provided under the outer layer.
• the non-stick coating 7 constituting a large proportion of the cooking surface, usually the majority, provides a good ease of cleaning.
• the presence of the tops 1 1 of the ribs 10 allows for a support surface for using rigid utensils to stir, cut, serve food, including metal utensils such as spatulas or knives, without degrading the non-stick coating 7 disposed in the bottoms 16 of the recesses 15.
• This construction of the cooking surface makes it possible to combine an important ease of cleaning guaranteed by the non-stick coating 7 with a longer life of the cooking vessel 1 guaranteed by the metal grid formed by the vertices 1 1 of the ribs 10, which protects the integrity non-stick coating 7 disposed in the bottoms 16 of the recesses 15 against mechanical aggression.
• the process for obtaining a cooking vessel 1 according to the invention may comprise the following steps, illustrated in FIGS. 3 to 8a:
• the screening on the bottom zone 24 of the cooking surface is thus obtained during the hot stamping operation.
• a punch having the weft (or pattern) that one wishes to engrave on the bottom of the cooking surface is used.
• the frame may for example be etched on the punch by electroerosion.
• the method consists in hot knocking a bottom plate 9 made of ferritic stainless steel on the face of the diffuser base 8 opposite to the cap 21, during hot stamping of the diffuser base 8 on the outside face 23 of the cap 21.
• a cooking vessel 1 for induction heating can thus be obtained.
• the bottom plate 9 is preferably in the form of a disc. If desired, the bottom plate 9 may be perforated.
• the process for obtaining a cooking vessel 1 according to the invention may comprise the following steps, illustrated in FIGS. at 14a:
• the pattern can be etched homogeneously over the entire cooking surface formed by the inner face 32, the stamping not degrading the screening 37.
• a typing operation preferably hot stamping, can be used to engrave the pattern. This operation makes it possible to engrave the desired weft on the outer face 30a of stainless steel.
• a punch with an electro-erosion weft is used for the striking operation.
• the striking operation is performed before stamping.
• the stamping of the sidewall can be carried out before the operation of etching a screening.
• the process for obtaining a cooking vessel 1 according to the invention may then comprise the following steps, illustrated in FIGS. 15 to 20a:
• a flank 40 from a multilayer steel sheet 40a, 40b, 40c having at least one outer face 40a of stainless steel, Embossing the flank 40 to form a cap 41 having an inner face 42 formed by said outer face 40a of stainless steel and an outer face 43, the inner face 42 having a bottom zone 44 surrounded by a side wall 45,
• Engraving of the screen 47 then takes place on at least a portion of the flat bottom zone 44 after stamping of the sidewall 40. This method therefore does not make it possible to envisage screening at the level of the connecting radius of curvature. the bottom zone 44 to the side wall 45, or to the side wall 45.
• Sanding of the surface to be coated is performed in order to create sufficient roughness 26; 36; 46 to allow the maximum adhesion of the non-stick coating 7 without degrading the vertices 1 1 formed during the etching.
• a polishing of the tips 1 1 of the ribs 10 is performed before the coating of the release liner 7, to limit the adhesion of the release liner 7 to the vertices 1 1 of the ribs 10.
• sandblasting can in particular be performed with a brown corundum abrasive (alumina).
• alumina brown corundum abrasive
• Ra and Rz are defined in ISO 4287.
• Ra is the arithmetic mean of deviations from the mean
• Rz is the average of the distance between the 5 largest peaks and the 5 deepest valleys.
• the surface topography can be studied in particular with a profilometer with probe equipped with a fine stylus equipped with a diamond point, or with an optical metrology apparatus type Altisurf®, in which a confocal chromatic sensor allows a non-contact measurement . The study of this surface topography makes it possible to define surface roughness parameters, defined above.
• the PTFE-type non-stick coating 7 can be applied by gunning to the surface having undergone the sanding treatment. If desired, at least one intermediate layer may be provided before the application of the outer layer of PTFE non-stick coating 7. After baking at 420 ° C. of the non-stick coating 7, a polishing of the inside of the container body 2 is carried out at least on the textured inner face 3, and if desired on the non-textured inside surface 4. Polishing makes it possible to reveal the surface of the mesh of stainless steel by preferential removal on the vertices 1 1 of the ribs 10, the coated recesses 15 not being affected by this operation. On the other hand, the outside of the container body 2 is also polished in order to remove the oxide layer that appeared during the baking of the PTFE coating.
• sandblasting of the surface to be coated is performed to create sufficient roughness to allow maximum adhesion of the non-stick coating 7 without degrading the vertices 1 1 formed during the etching .
• the sandblasting can in particular be carried out with a corundum zirconia abrasive.
• the sanding conditions are adjusted in order to obtain the following roughness parameters for the roughnesses 26, 36, 46: - Ra> 1, 5 ⁇ preferably 2 ⁇ ⁇ Ra ⁇ 3 ⁇
• the sol-gel ceramic type nonstick coating 7 may be applied by gunning to the surface having undergone the sanding treatment. A coating thickness of 20 to 40 ⁇ can be targeted.
• the firing cycle of the sol-gel coating on a stainless steel substrate may include a temperature rise at 250 ° C in 15 min, followed by a plateau at 250 ° C for 15 min.
• a polishing of the interior of the container body 2 reveals the surface of the stainless steel mesh formed by the vertices 1 1 of the ribs 10, by the preferential removal of the sol-gel coating on the vertices 1 1 of the ribs 10.
• the ceramic coated hollows are not affected by such an operation.
• the outside of the container body 2 is also polished to remove the oxide layer that appeared during the firing of the sol-gel coating.
• the sides 12 of the ribs 10 form ramps connecting the vertices 1 1 of the ribs 10 to the bottoms 16 of the recesses 15.
• the sides 12 of the ribs 10 are covered by the non-stick coating 7; the vertices 1 1 of the ribs 10 are devoid of non-stick coating 7.
• the ribs 10 are not necessarily obtained by hot stamping or cold stamping.
• Laser etching can be performed on the sidewall 20; 30 ; 40 before or after stamping.
• the use of a high power laser makes it possible to achieve the desired etching depths (of the order of 50 to 100 ⁇ ) as well as the fineness of the vertices 1 1 of the ribs 10 desired.
• a striking operation may be retained in particular to assemble the diffuser base 8 and optionally the bottom plate 9 of ferritic stainless steel, when the sidewall 20 is made of stainless steel.
• the present invention is in no way limited to the described exemplary embodiments and their variants, but encompasses many modifications within the scope of the claims.

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• Engineering & Computer Science (AREA)
• Food Science & Technology (AREA)
• Mechanical Engineering (AREA)
• Life Sciences & Earth Sciences (AREA)
• Wood Science & Technology (AREA)
• Manufacturing & Machinery (AREA)
• Frying-Pans Or Fryers (AREA)
• Cookers (AREA)
• Laminated Bodies (AREA)

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• 2014
  • 2014-09-23 FR FR1458977A patent/FR3025995B1/fr not_active Expired - Fee Related
• 2015
  • 2015-09-22 JP JP2017515959A patent/JP6797109B2/ja active Active
  • 2015-09-22 KR KR1020177010452A patent/KR102349011B1/ko active Active
  • 2015-09-22 EP EP15781383.3A patent/EP3197329B1/fr active Active
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  • 2015-09-22 CN CN201580051264.2A patent/CN107105913B/zh active Active
  • 2015-09-22 WO PCT/FR2015/052541 patent/WO2016046492A1/fr not_active Ceased
  • 2015-09-22 US US15/513,705 patent/US10368691B2/en active Active
• 2019
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