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EP-4082770-B1 - MULTILAYER PLATE

EP4082770B1EP 4082770 B1EP4082770 B1EP 4082770B1EP-4082770-B1

Inventors

  • KIRCHHOFF, TOBIAS

Dates

Publication Date
20260506
Application Date
20220421

Claims (11)

  1. Multilayer plate (100), comprising: a carbon layer (10), covered by a metallic layer (20), a substrate layer (30), covered at least partially by the carbon layer (10) and the metallic layer (20), wherein the metallic layer (20) comprises a first zone (I) and a second zone (II) and wherein the first zone (I) is a zone defined by the carbon layer (10) and has a void first space (12) between the carbon layer (10) and the metallic layer (20), and the second zone (II) is a zone defined by carbon layer-free zone and has a void second space (32) between the substrate layer (30) and the metallic layer (20); wherein the substrate layer (30) is made of a polyurethane flexible foam, wherein the first zone (I) has a higher thermal conductivity as the second zone (II).
  2. Multilayer plate (100) according to claim 1, wherein the carbon layer (10) is a graphite plate with a thickness in a range of 2 millimetres and 4 millimetres.
  3. Multilayer plate (100) according to claim 1 or 2, wherein the graphite plate comprises a highly oriented pyrolytic graphite.
  4. Multilayer plate (100) according to any of the above claims, wherein the metallic layer (20) has a thickness in a range of 0.05 millimetres to 0.1 millimetres.
  5. Multilayer plate (100) according to any of the above claims, wherein the metallic layer (20) is one of an aluminium foil, a copper foil or a steel foil.
  6. Multilayer plate (100) according to any of the above claims, further comprising a frame (40) surrounding the substrate layer (30) and at least partially the carbon layer (10) for holding the substrate layer (30) and the carbon layer (10) in place.
  7. Multilayer plate (100) according to any of the above claims, wherein the metallic layer (20) is affixed on a circumferential surface (41) of the frame (40).
  8. Multilayer plate (100) according any of the above claims, further comprising an additional layer (50) made of corrugated board and arranged next to the carbon layer 10, wherein the second zone (II) is a zone defined by the additional layer (50).
  9. Use of the multilayer plate according to the previous claims as a demonstration display for demonstrating a different thermal conductivity in a first zone (I) compared to a second zone (II).
  10. A demonstration display for demonstrating a differential thermal conductivity in a first zone (I) or a second zone (II) comprising a multilayer plate (100) according to claim 1.
  11. A method for demonstrating a differential thermal conductivity in a first zone (I) compared to a second zone (II) of a multilayer plate (10) according to claim 1 comprising: - placing one or more body parts on one of the first zone (I) or the second zone (II); - placing a same one or a different one of the one or more body parts on a different one of the first zone (I) or the second zone (II); and - comparing the effect of the placing of the one or more body parts on the first zone (I) and the second zone (II).

Description

Field of the Invention The field of the invention concerns a multilayer plate with a sensitive upper surface. Prior Art Multilayer plates comprising a plurality of layers with different properties are known in the art. For example, a multilayer plate is disclosed by the Chinese Utility Model CN 206245502 U. The multilayer plate comprises a protective layer, a fireproofing layer, a graphite fibre layer, a foamed aluminium layer, and a base layer which are bonded together by a bonding layer. The base layer is a fibre-reinforced resin layer and the protective layer is a PET (polyethylene terephthalate) layer. A natural graphite/ aluminium composite heat sink is disclosed by the Chinese Utility Model CN 204968327 U. The heat sink comprises an aluminium foil layer and a graphite layer on the upper side and lower side of the aluminium foil layer. The aluminium foil layer comprises an aluminium substrate with a roughened layer on the upper side and the lower sides of the aluminium substrate. A surface of the aluminium foil layer is uniformly distributed with holes and the roughened layer is engaged with the graphite layer through the holes. The Chinese utility CN 206374263 U model discloses a refractory graphite sheet comprising a graphite substrate and a plurality of folded sheets arranged side by side. The folded sheets have a heat dissipation pitch and are partially folded and overlapped by the graphite substrate. The outer surface of the graphite substrate comprises a protective film layer, a foam buffer layer, a first adhesive layer, a metal aluminium layer, a second adhesive layer, and a first graphite layer. The German patent application No. DE 10 2006 056988 A1 describes a heat transfer composite including a plurality of pyrolytic graphite parts present in an amount greater than about 50% by volume of the heat transfer composite and a non-carbonaceous matrix holding the pyrolytic graphite parts in a consolidated mass. The matrix can be made of Aluminum. The international patent application No. WO 2018/067104 A1 describes a multilayer housing including a first continuous layer comprising copper, plastic, graphene, aluminum, titanium, magnesium, or combinations thereof, a void layer on the first continuous layer, and a second continuous layer on the void layer. The US patent application No. US 2020/269543 A1 describes a thermal insulation structure including a base plate and a thermal insulation component. The thermal insulation component is disposed on the base plate and is made of aerogel. The material of the base plate includes, for example, metal, that has a high thermal conductivity, such as copper or aluminum. The US patent application No. US 2017/323780 A1 describes a thermally conductive sheet including a first graphite sheet and a second graphite sheet. The second graphite sheet is any of a second graphite sheet disposed to entirely overlap the first graphite sheet, a second graphite sheet disposed to partially overlap and to be shifted from the first graphite sheet, and a second graphite sheet disposed such that there is an interval of less than 5 mm between the second graphite sheet and the first graphite sheet. The graphite sheets are sandwiched between metal layers. Brief description of the invention The present document describes a multilayer plate which comprises three layers. A carbon layer is covered by a metallic layer, and a substrate layer is covered at least partially by the carbon layer and the metallic layer. The metallic layer comprises a first zone and a second zone. The first zone is a zone defined by the carbon layer and has a void first space between the carbon layer and the metallic layer, and the second zone is a zone defined by carbon layer-free zone and has a void second space between the substrate layer and the metallic layer. The substrate layer is made of polyurethane flexible foam. The first zone has a higher thermal conductivity as the second zone. A cooling effect is generated at the metallic layer when a hand is placed in the first zone compared to when the hand is placed in the second zone. This cooling effect is a result of the polyurethane flexible foam being a thermal insulator and therefore providing slower conduction of the heat in the second zone compared to the conduction of the heat in the first zone by the graphite layer. The thermal energy is absorbed by the layers of the first zone in a higher amount than the layers in the second zone. In an aspect the carbon layer is a graphite plate with a thickness in a range of 2 millimetres and 4 millimetres. A thicker carbon layer has more capacity to absorb thermal energy than a thinner carbon layer. The carbon layer can be made from different graphite composition and in one aspect is made from one of a highly oriented pyrolytic graphite or a super-oriented graphite. These specific graphite compositions are beneficial the cooling effect felt by contact by a user with the multilayer plate. In an aspect, the polyurethan