(19)
(11) EP 4 289 617 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION
Note: Bibliography reflects the latest situation

(15) Correction information:
Corrected version no 1 (W1 A1)

(48) Corrigendum issued on:
17.01.2024 Bulletin 2024/03

(43) Date of publication:
13.12.2023 Bulletin 2023/50

(21) Application number: 23171886.7

(22) Date of filing: 05.05.2023
(51) International Patent Classification (IPC): 
B32B 21/04(2006.01)
B32B 21/13(2006.01)
 B32B 21/12(2006.01)
B32B 21/14(2006.01)
(52) Cooperative Patent Classification (CPC):
B32B 21/042; B32B 21/12; B32B 21/13; B32B 21/14; B32B 2250/03; B32B 2250/40; B32B 2264/06; B32B 2264/067; B32B 2307/304; B32B 2317/02; B32B 2419/00; B32B 2479/00
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC ME MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA
Designated Validation States:
KH MA MD TN

(30) Priority: 05.05.2022 FI 20225391

(71) Applicant: Metsäliitto Osuuskunta
02100 Espoo (FI)

(72) Inventor:
  • SOKKA, Kasperi
    02100 Espoo (FI)

(74) Representative: Laine IP Oy 
Porkkalankatu 24
00180 Helsinki
00180 Helsinki (FI)

 
Remarks:
Claims 16-24, 28, 29, 31, 34, 36, 37 are deemed to be abandoned due to non-payment of the claims fees (Rule 45(3) EPC).
 


(54) A MULTI-LAYERED CORE BOARD, A DOOR, AND A METHOD FOR MANUFACTURING A MULTI-LAYERED CORE BOARD


(57) According to an example aspect of the present invention, there is provided a core board for a door, the core board having a multi-layered structure and comprising: a first wood-based panel; a second wood-based panel; between the first wood-based panel and the second wood-based panel, a thermally insulating layer comprising or consisting of a wood-based material, wherein the density of the thermally insulating layer is less than the density of the first and the second wood-based panels, wherein the core board has a U value of less than 1.8 W/m2K.