EP0068873A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Composite boards and panels
Assignee: Quinton & Kaines (holdings) Ltd
•
Filing: 1982-06-28
•
Granted: —
•
Expires: 2002-06-28
Abstract
Abstract A composite board or panel has a lightweight central layer of for example cellulosic material such as paper "honeycomb". In each face of this there is adhered a facing layer of paper or paperboard. Each face of each facing layer is coated with an inert material impervious to water or water-vapour such as polymers, bitumen or waxes. Outermost paper or foil layers can be provided on each face of the composite. The composite is particularly resistant to uptake of water and thus does not warp.
Inventors
- 👤 Colin Charles Kaines
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 05:02
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/04; B32B15/12; B32B15/20; B32B27/00; B32B27/06; B32B27/10; B32B29/00; B32B29/002; B32B29/005; B32B3/00; B32B3/10; B32B3/12; B32B38/00; B32B38/0008; B32B7/00; B32B7/04; B32B7/12; E; E04; E04C; E04C2/00; E04C2/30; E04C2/34; E04C2/36; E04C2/365; B32B2307/00; B32B2307/70; B32B2307/726; B32B2307/7265; B32B2310/00; B32B2310/14; B32B2311/00; B32B2311/24
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
75 words
A composite board or panel in which a lightweight central layer or core of void-containing material has adhered thereto on both faces a facing layer of paper or paper-board, each such facing layer being itself coated (a) on its outer face with a layer of material inert thereto and impervious to water in liquid or vapour form, and (b) on its inner face with a layer of the same or different material of like properties.
Claim 2
Dependent Claim
75 words
A composite board or panel in which a lightweight central layer or core of void-containing material has adhered thereto on both faces a facing layer of paper or paper-board, each such facing layer being itself coated (a) on its outer face with a layer of material inert thereto and impervious to water in liquid or vapour form, and (b) on its inner face with a layer of the same or different material of like properties.
Claim 3
Dependent Claim
35 words
A composite board or panel as claimed in claim 1 in which one or both inert layers are covered at least partly with one or more additional applied layers which does not impart warping characteristics.
Claim 4
Dependent Claim
39 words
A composite board or panel as claimed in claim 2 in which the additional applied layer is formed of paper a thickness less than one-tenth of the thickness of the facing layer, a metal foil, or a polymeric foil.
Claim 5
Dependent Claim
25 words
A composite board or panel as claimed in claim 3 in which the applied layer is aluminium foil of thickness from 0.005 to 0.1 mm.
Claim 6
Dependent Claim
22 words
A composite board or panel as claimed in claim 4 in which the aluminium foil layer is coated with a non-inflammable lacquer.
Claim 7
Dependent Claim
20 words
A composite board or panel as claimed in any of claims 1-5 in which the central core comprises cellulosic material.
Claim 8
Dependent Claim
34 words
A composite board or panel as claimed in claim 6 in which the cellulosic central core is a coherent layer composed of thin layers of wood,chips or splinters of wood,or wood subdivided into fibres.
Claim 9
Dependent Claim
43 words
A composite board or panel as claimed in claim 7 in which the wood fibres of the cellulosic central core layer are laid to form a paper or cardboard and this is used as one or more flat, corrugated or otherwise configured layer.
Claim 10
Dependent Claim
26 words
A composite board or panel as claimed in claim 8 in which the cellulosic central core layer is formed as a paper honeycomb, as herein defined.
Claim 11
Dependent Claim
27 words
A composite board or panel as claimed in claim 6 in which the cellulosic central core is a coherent layer composed of a compressed non-wood fibrous materials.
Claim 12
Dependent Claim
39 words
A composite board or panel as claimed in any one of claims 1 to 10 in which the facing layer on one face of the central core layer is thicker than the facing layer on the other core face.
Claim 13
Dependent Claim
37 words
A composite board or panel as claimed in any one of claims 1 to 11 in which the inert layers on the facing layer are composed of a synthetic polymer, of a bitument, or of a wax.
Claim 14
Dependent Claim
29 words
A composite board or panel as claimed in any one of claims 1 to 12 in which the central core layer is from 3 to 75 mm in thickness.
Claim 15
Dependent Claim
27 words
A composite board or panel as claimed in any of claims 1 to 13 in which the facing layer is from 0.15 to 3 mm in thickness.
Claim 16
Dependent Claim
38 words
A composite board or panel as claimed in any of claims 1 to 14 in which each inert layer on the facing layers has a thickness corresponding to a coating weight of 10 to 100 gm/m 2 .
Claim 17
Dependent Claim
38 words
A composite board or panel as claimed in any of claims 1 to 15 in which the inert layer is polymeric and coated with paper, and has a minimum thickness corresponding to a 20 gm/m 2 coating weight.
Claim 18
Dependent Claim
40 words
A composite board or panel as claimed in any one of claims 1 to 15 in which the inert layer is polymeric and coated with metal foil, and has a minimum thickness corresponding to a 30 gm/m 2 coating weight.
Claim 19
Dependent Claim
33 words
A composite board or panel as claimed in any one of claims 1 to 17 in which the facing layers are adhered to the central core layer by a urea-formaldehyde or polyvinvylacetate adhesive.
Claim 20
Dependent Claim
96 words
A method for the production of composite boards or panels as claimed in claim 1 in which paper or paperboard facing sheets clad with the inert barrier layer are arranged in face-to-face pairs and provided with adhesive layers on each free outer face; the pairs of facing sheets are stacked alternately with layers of lightweight void-containing material to provide a supply of wet composite boards or panels; and these wet composite boards or panels are thereafter either, (a) hot-pressed as a stack and thereafter separated or, (b) separated into individual boards or panels and individually hot-pressed.
Claim 21
Dependent Claim
79 words
A method for the production of composite boards or panels as claimed in claim 1, in which paper or paperboard facing sheets clad with the inert barrier layer are arranged in face-to-face pairs and provided with adhesive layers on each free outer face; the pairs of facing sheets are separated and applied with their adhesive surfaces each to one face of a layer of lightweight void-containing material to provide a wet composite board; and this board is individually hot-pressed.
Claim 22
Dependent Claim
51 words
A method as claimed in claim 19 or 20 used when one inert layer on each facing sheet is clad with a paper or foil lamination and the other treated to facilitate adhesion; in which the facing sheets are adhesive coated in pairs with the paper of foil surface in contact.
Claim 23
Dependent Claim
83 words
A continuous method for the production of composite boards or panels as claimed in claim 1 in which: two reels of the facing sheet material clad with the inert barrier layer are continuously coated with adhesive; the adhesive surfaces are applied one to each side of a continuous supply of the central core layer from a reel, magazine or continuously abutting sequence of sheets: the wet continuous composite is cut to desired lengths; and the cut lengths are hot-pressed individually or in groups.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.