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WO2017072658A1 - Insert en alliage de matériau non magnétique et de matériau ferromagnétique ou ferrimagnétique, ustensiles de cuisine pour la cuisson à induction comprenant un tel insert et procédé de fabrication desdits ustensiles de cuisine - Google Patents

Insert en alliage de matériau non magnétique et de matériau ferromagnétique ou ferrimagnétique, ustensiles de cuisine pour la cuisson à induction comprenant un tel insert et procédé de fabrication desdits ustensiles de cuisine Download PDF

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Publication number
WO2017072658A1
WO2017072658A1 PCT/IB2016/056411 IB2016056411W WO2017072658A1 WO 2017072658 A1 WO2017072658 A1 WO 2017072658A1 IB 2016056411 W IB2016056411 W IB 2016056411W WO 2017072658 A1 WO2017072658 A1 WO 2017072658A1
Authority
WO
WIPO (PCT)
Prior art keywords
insert
kitchenware
mass
ferromagnetic
alloy
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.)
Ceased
Application number
PCT/IB2016/056411
Other languages
English (en)
Inventor
Ennio Corrado
Chiara CREMONESI
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.)
E-Wenco Srl
Original Assignee
E-Wenco Srl
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 E-Wenco Srl filed Critical E-Wenco Srl
Publication of WO2017072658A1 publication Critical patent/WO2017072658A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • 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

Definitions

  • the present invention relates to an insert made of an alloy of an amagnetic material and a ferromagnetic or ferrimagnetic material, which insert is adapted to be used in induction cooking.
  • the present invention relates to an alloy wherein the percentage of ferromagnetic or ferrimagnetic material is very low with respect to the percentage of amagnetic material.
  • the present invention further relates to a kitchenware for induction cooking comprising such an insert and a method for making such a kitchenware.
  • induction cookers comprise a coil, placed below a hob, inside which a time-varying electric current is flowing. Such a variable current produces a magnetic field time-varying too as a function of the generating current. Variations of the flow of magnetic field produce an induced electromotive force, by Faraday effect. When a conductive metal is inside a time-varying magnetic field, the above mentioned induced electromotive force generates induced currents (called parasitic currents) which circulate inside the conductor.
  • parasitic currents induced currents
  • the kitchenware market uses more and more often alternative materials such as glass, fiberglass, borosilicate glass, ceramic, porcelain, plastics, because of their versatility and low costs.
  • Another purpose of the present invention is to provide a cheap insert that makes the above mentioned alternative materials suitable to be used in induction cooking .
  • a further purpose of the present invention is to provide a kitchenware for induction cooking that is versatile, cheap and at same time efficient.
  • Another purpose of the present invention is to provide a method for making a kitchenware for induction cooking that is simple and cheap and achieves a kitchenware overcoming the above described drawbacks.
  • Another purpose of the present invention is to make amagnetic metals compatible with applications that provide for induction heating.
  • Another object of the present invention is to provide manufactured products that can be more efficiently induction heated and by consuming less power than known solutions .
  • an insert for kitchenware for induction cooking comprising at least one film having thickness s made of an alloy of at least one amagnetic material and at least one ferromagnetic or ferrimagnetic material wherein s is lower than, or equal to, 4 cm, and preferably lower than, or equal to, 500 ⁇ , and wherein said alloy comprises an amount of amagnetic material comprised between 90% and 99% by mass (wt.%) and an amount of ferromagnetic or ferrimagnetic material comprised between 1% and 10% by mass (wt.%), said percentages being referred to the total mass of the alloy.
  • Such features i.e. the percentages of materials in combination with the claimed thicknesses, allow obtaining light, easy to handle and cheap kitchenware for induction cooking .
  • the proportions between the used materials and the thickness of the insert make it possible to be easily embedded in different types of kitchenware by simple and cheap manufacturing processes.
  • the amagnetic material comprises at least one material selected from silver, copper, aluminum, platinum, boron and the ferromagnetic or ferrimagnetic material comprises at least one material selected from nickel, iron, cobalt.
  • the amagnetic material can contain at least one rare- earth element or oxide of rare-earth elements, preferably in content lower than 1% by mass.
  • the rare-earth elements in small amounts, as mentioned, allow to refine the metal structure of the alloy and to make it fluid.
  • the alloy used for making the insert also comprises non-metals, such as carbon, and/or metalloids, such as silicon, in amounts lower than, or equal to, 1% by mass (wt.%) .
  • non-metals such as carbon
  • metalloids such as silicon
  • Some non-metals and some metalloids have amagnetic or ferromagnetic behavior. Therefore, the non-metals and/or metalloids content in the alloy will take into account this aspect.
  • the choice of the nature and quantity of non-metals and/or semi metals depends upon the result you want to achieve.
  • the alloy can contain less than 1% by mass (of the total mass) of carbon to increase the melting point of the alloy itself.
  • the insert also comprises one or more additional layers coupled with the film, that have the purpose of improving the mechanical, thermal and/or electric resistance features of the insert.
  • the film is made of materials having relatively low melting temperatures (such as for example aluminum)
  • the additional layers are made of insulating materials, the film would also be thermally shielded by the additional layers.
  • the film is sandwiched between layers of electrically insulating material, in the absence of air, i.e. is confined under vacuum.
  • the film can be induction heated until completely melted, switching to the liquid state. A subsequent cooling brings the film back to the solid state.
  • the purposes of the present invention are also achieved by the described and claimed methods that allow obtaining kitchenware for induction cooking in a simple and cheap way and that allow embedding the insert in the kitchenware with evident manufacturing and maintenance advantages .
  • alloy is used to identify the materials in which the mixing of metals or other constituents is intentional. Therefore, the term “alloy” is irrespective of undesired impurities being present or not that can derive from the nature of minerals from which the compounds are extracted and/or from the mining and metallurgical processes used.
  • magnets are meant all of those materials, such as diamagnetic or paramagnetic materials, not appreciably interacting with magnetic fields.
  • ferrimagnetic or ferrimagnetic materials are meant all of those materials appreciably interacting with magnetic fields. Commonly, such materials are also called magnetic materials.
  • metals are respectively classified as diamagnetic, paramagnetic or ferromagnetic or ferrimagnetic, depending on the relative magnetic permeability at room temperature and further, when talking about ferromagnetic behavior, the behavior at room temperature is always meant.
  • FIG. 1 shows a schematic perspective view of a first embodiment of the insert according to the invention
  • figure 2 shows a sectional view of a second embodiment of the insert according to the invention
  • FIG. 3 shows a sectional view of a third embodiment of the insert according to the invention.
  • FIG. 4 shows a sectional view of a kitchenware according to an embodiment of the invention
  • FIG. 5 shows a sectional view of a kitchenware according to a further embodiment of the invention.
  • the following detailed description refers to an insert for kitchenware for induction cooking, a kitchenware for induction cooking and a method for making a kitchenware for induction cooking.
  • an insert for kitchenware for induction cooking is denoted as a whole with the reference number 1.
  • the insert 1 comprises a film 2 having thickness s comprised in the range 0 cm ⁇ s ⁇ 4 cm.
  • the minimum value is excluded from the range, whereas the maximum value is comprised.
  • the thickness s is lower than 500 ⁇ , for example comprised between 5 ⁇ and 200 ⁇ , and still more preferably between 5 ⁇ and 100 ⁇ .
  • Such a film 2 is made of an alloy of at least two materials or mixtures of materials: the first material is an amagnetic material, such as for example a diamagnetic or paramagnetic material, or a mixture of amagnetic materials compatible between each other, whereas the second material is a ferromagnetic or ferrimagnetic material or a mixture of ferromagnetic or ferrimagnetic materials compatible between each other.
  • the first material is an amagnetic material, such as for example a diamagnetic or paramagnetic material, or a mixture of amagnetic materials compatible between each other
  • the second material is a ferromagnetic or ferrimagnetic material or a mixture of ferromagnetic or ferrimagnetic materials compatible between each other.
  • ferromagnetic when its relative magnetic permeability is much higher than the unit; diamagnetic when it is lower than the unit and paramagnetic when it is slightly higher than the unit.
  • the content of amagnetic material in the alloy is comprised between 90% and 99% by mass (wt.%), preferably between 95% and 99% by mass (wt.%), even more preferably between 97% and 99% (wt.%), with respect to the total mass of the alloy.
  • the content of ferromagnetic material is comprised between 1% and 10% by mass (wt.%), preferably between 1% and 5% by mass (wt.%), even more preferably between 1% and 3% by mass (wt.%), still with respect to the total mass of the alloy.
  • the percentages of the amagnetic material and magnetic material are such that, if summed, they constitute 100% of the alloy, i.e. no additional material is provided.
  • the amagnetic material is preferably selected from gold, silver, copper, aluminum, platinum; the ferromagnetic material is selected from nickel, iron, cobalt.
  • Titanium and boron allow obtaining a satisfying refining of the alloy, since they allow the formation of smaller and substantially spherical pellets and, consequently, improve the overall mechanical features.
  • the content of boron, if present, is lower than 0.5% by mass, and is preferably comprised in the range 0.1% - 0.2% and the content of titanium, if present, is lower than 0.5% by mass, and is preferably comprised in the range 0.1% - 0.2%.
  • the amagnetic material can contain at least one rare- earth element or an oxide of rare-earth elements, but with content preferably lower than 1% by mass.
  • the alloy is preferably obtained by a technique selected from: melting, sintering, dispersing a powdered metal in a liquid metal phase.
  • the film 2 can easily be made by methods know to the technician of the art, for example by rolling. Such a film 2, if placed in a variable magnetic field having suitable intensity, in a few seconds is able to reach temperatures of several hundred degrees, thanks to the induced currents generated therein. Therefore, it proves being optimal for the use in induction cooking.
  • Such an additional layer 3 is preferably made of electrically insulating material, such as for example glass, fiberglass, borosilicate glass, porcelain, resin, ceramic, polymeric materials. Thereby, it is possible to maximize the heat exchange of the insert 1 by protecting the film 2, i.e. avoiding its approach the melting point.
  • Such additional layer 3 made of insulating material also serves to avoid overheating the hob due to the heating of the kitchenware.
  • the additional layers 3 are two and are respectively located at the top surface and the bottom surface of the film 2.
  • one additional layer 3 is placed between two films 2. It is possible to provide inserts 1 without additional layers 3, or multilayer inserts 1 provided with three or more additional layers 3, having features equal or different between each other and being interposed between films 2 or in contact with one another, depending on the features you want to give to the insert 1.
  • the additional layers 3 can be coupled with the film 2 prior to the making of a kitchenware 4 or concurrently.
  • Said coupling can be carried out by a known process, such as compression molding or thermoforming or welding (preferably ultrasonic bonding) .
  • the coupling can be made by injection molding or additive methods or spraying (the material constituting the additional layer 3 is sprayed onto the film 2), or by dipping in a bath of material (the film 2 is dipped in a bath of material constituting the additional layer 3) .
  • the insert is directly made in a cavity between two layers of electrically insulating material.
  • the insert remains confined, in vacuum conditions.
  • the alloy is casted in the cavity in vacuum conditions and the cavity is then isolated from the outside.
  • an insert is obtained, that during the normal use can be induction heated until melted, then solidifying in the cavity when the induced magnetic field has ceased. Therefore, the kitchenware embedding this solution also exploits the latent heat of fusion/solidification of the alloy .
  • the kitchenware 4 comprises a bottom wall 5 and a lateral wall 6 which define a compartment 7 adapted to contain liquids or solids intended to be heated.
  • the kitchenware 4 can have any shape.
  • the bottom part 5 is preferably flat or anyway defines a plane, so that to provide an optimal support on an induction hob.
  • the kitchenware 4 comprises at least one insert 1 as described above, which is placed at least at the bottom wall 5.
  • the insert 1 is placed at the bottom wall 5 and lateral wall 6, whereas in the embodiment of figure 5, the insert 1 is only placed at the bottom wall 5. In both cases, the insert 1 substantially has the same extent of the wall on which it is applied. Obviously, it is possible to provide for variants to such embodiments, for example, it is possible to apply an insert 1 of dimensions smaller than the walls to which it is applied, or it is possible to apply several inserts 1 (placed on the plane of the wall or on a plane perpendicular to the wall) to the same wall.
  • the insert 1 is advantageously embedded in the kitchenware 4, i.e. the two items make a single piece. In the kitchenware 4 of figure 5, the insert 1 is placed inside the bottom wall 5, however it could be placed at the higher surface or at the lower surface of the bottom wall, but in any case it is embedded in the kitchenware 4 itself.
  • the kitchenware 4 of figure 5 also comprises handles 8 to handle the kitchenware 4. They can be made of thermally non-conductive material or anyway be isolated from the body of the kitchenware 4, in a known manner.
  • the kitchenware 4 can comprise the insert 1 only, i.e. can be obtained by shaping the insert 1 as showed in figure 4, or also comprise a portion made of electrically insulating material, as showed in figure 5.
  • said insulating material constitutes the body of the kitchenware 4, in which the insert 1 is embedded.
  • Such electrically insulating material is preferably selected from: polymeric materials, glass, fiberglass, borosilicate glass, ceramic, porcelain, resins, ceramics, stones .
  • the material must be suitable for cooking edible, solid or liquid substances, i.e. it must tolerate temperatures in the order of some hundreds of Celsius degrees without releasing substances harmful to health.
  • the insert 1 When an induction cooker is switched on, i.e. the magnetic field is activated, induced currents inside the insert 1 heat the substances contained in the kitchenware 4. In other words, the insert 1 confers ferromagnetic and electrical conductivity features to the kitchenware 4, thus making it suitable for induction cooking and preserving at the same time the features peculiar to its constituent materials .
  • the insert 1 allows converting the energy of the magnetic field into heat and replacing traditional sources, such as gas or electric cookers, in the interest of safety.
  • the present invention also relates to a method for making a kitchenware 4 for induction cooking. Such a method comprises the steps of:
  • the heating step is carried out by subjecting the insert 1 to a time-varying magnetic field to generate, in the insert 1 itself, parasitic currents dissipating the heat by Joule effect, which cooperates with the dissipative effect re-orienting the magnetic domains known in literature as hysteresis loop which is typical and characteristic of ferromagnetic materials and the cooling step is carried out by ceasing the magnetic field.
  • the invention further relates to a method for making a kitchenware 4 for induction cooking, comprising the steps of:
  • the insulating material to which it will be coupled in the following step will be that constituting the body of the kitchenware 4, such as for example in figure 5. If instead the step of making the insert is not expected to provide the insert 1 with additional layers 3, the insulating material to which it will be coupled in the following step will constitute such additional layers 3, and the insert 1 will constitute the kitchenware 4 itself, such as for example in figure 4.
  • the electrically insulating material is preferably selected from: polymeric materials, glasses, fiberglasses, borosilicate glasses, porcelains, resins, ceramics, stones.
  • the step of making the insert 1 can provide for processing the insert 1 itself, which are adapted to improve its mechanical and/or thermal properties, such as for example the embossing.
  • the step of coupling the insert 1 to the insulating material can comprise the following sub-steps:
  • step c is carried out to obtain kitchenware 4 such as those of figure 5, i.e. provided with a body or at least one portion made of insulating material.
  • the insulating material that will constitute the body of the kitchenware 4 of figure 5 is loaded in the mold together with the insert 1, so that to obtain the embedding of the insert 1 in the kitchenware 4 during the molding of the kitchenware 4, rapidly, simply and cheaply.
  • step c is not carried out.
  • the molding serves to couple the film 2 and additional layers 3 and to give the desired shape to the kitchenware, rapidly, simply and cheaply.
  • the method for making a kitchenware 4 will comprise the following steps of:
  • the step of making the insert 1 is carried out by making the film 2 and subsequently weld- coupling the additional layers 3, whereas the step of coupling an insulating material is carried out by thermoforming .
  • the welding is preferably an ultrasonic and under vacuum bonding.
  • the invention refers to any kitchenware 4 obtained by one of the above described methods.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Cookers (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)

Abstract

L'invention concerne un insert pour ustensiles de cuisine pour la cuisson à induction, comprenant au moins un film possédant une épaisseur s en alliage d'au moins un matériau amagnétique et d'au moins un matériau ferromagnétique ou ferrimagnétique, s étant inférieur ou égal à 4 cm et ledit alliage comprenant une quantité de matériau amagnétique comprise entre 90 % et 99 % en masse et une quantité de matériau ferromagnétique comprise entre 1 % et 10 % en masse, lesdits pourcentages étant rapportés à la masse totale de l'alliage. L'invention concerne également des ustensiles de cuisine comprenant un tel insert et un procédé de fabrication d'ustensiles de cuisine pour la cuisson à induction.
PCT/IB2016/056411 2015-10-27 2016-10-25 Insert en alliage de matériau non magnétique et de matériau ferromagnétique ou ferrimagnétique, ustensiles de cuisine pour la cuisson à induction comprenant un tel insert et procédé de fabrication desdits ustensiles de cuisine Ceased WO2017072658A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102015000066026(UB2015A004830) 2015-10-27
ITUB2015A004830A ITUB20154830A1 (it) 2015-10-27 2015-10-27 Inserto in lega di un materiale amagnetico e un materiale ferromagnetico, utensile per cottura ad induzione comprendente tale inserto e metodo per la realizzazione di tale utensile

Publications (1)

Publication Number Publication Date
WO2017072658A1 true WO2017072658A1 (fr) 2017-05-04

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PCT/IB2016/056411 Ceased WO2017072658A1 (fr) 2015-10-27 2016-10-25 Insert en alliage de matériau non magnétique et de matériau ferromagnétique ou ferrimagnétique, ustensiles de cuisine pour la cuisson à induction comprenant un tel insert et procédé de fabrication desdits ustensiles de cuisine

Country Status (2)

Country Link
IT (1) ITUB20154830A1 (fr)
WO (1) WO2017072658A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017104727A1 (de) 2017-03-07 2018-09-13 Miele & Cie. Kg Kochgeschirr zur Verwendung mit einem Induktionskochfeld
WO2021194581A3 (fr) * 2019-12-12 2021-12-02 Heat X, LLC Matériaux et ensembles paramagnétiques pour des applications magnétocaloriques ou thermoélectriques quelconques

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011064455A1 (fr) * 2009-11-26 2011-06-03 Iittala Group Oy Ab Récipient de cuisson convenant au chauffage par induction et procédé de fabrication associé
EP2940168A1 (fr) * 2014-04-30 2015-11-04 Ennio Corrado Film constitué d'un alliage d'aluminium et de fer, utilisation de ce matériau en combinaison avec un champ magnétique oscillant et ustensile de cuisine de cuisson par induction comprenant un tel film

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011064455A1 (fr) * 2009-11-26 2011-06-03 Iittala Group Oy Ab Récipient de cuisson convenant au chauffage par induction et procédé de fabrication associé
EP2940168A1 (fr) * 2014-04-30 2015-11-04 Ennio Corrado Film constitué d'un alliage d'aluminium et de fer, utilisation de ce matériau en combinaison avec un champ magnétique oscillant et ustensile de cuisine de cuisson par induction comprenant un tel film

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE CA, [online] 1 December 1987 (1987-12-01), DEAN R J ET AL: "Production of high-quality aluminum foil", XP002734702, retrieved from CA; STN Database accession no. 108-171820 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017104727A1 (de) 2017-03-07 2018-09-13 Miele & Cie. Kg Kochgeschirr zur Verwendung mit einem Induktionskochfeld
WO2021194581A3 (fr) * 2019-12-12 2021-12-02 Heat X, LLC Matériaux et ensembles paramagnétiques pour des applications magnétocaloriques ou thermoélectriques quelconques
CN115380339A (zh) * 2019-12-12 2022-11-22 热力X有限责任公司 用于任何磁热或热电应用的顺磁性材料和组装体

Also Published As

Publication number Publication date
ITUB20154830A1 (it) 2017-04-27

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