# US 10,307,994 B2 · Composite board composed of wood material

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- Number: US 10,307,994 B2
- Document ID: US10307994B2
- Status: Granted
- Kind: B2
- Application number: 15/505,129
- Filed: 2015-08-17
- Published: 2018-07-05
- Granted: 2019-06-04
- Earliest claimed: 2014-08-20
- Assignees: SWISS KRONO Tec AG
- Applicants: Swiss Krono Tec AG
- Inventors: Josef Hofer
- Web page: https://patentgrep.com/patent/US10307994B2

## CPC

- B32B 21/06: of paper or cardboard
- B32B 21/02: {the layer being formed} of fibres, chips, or particles {, e.g. MDF, HDF, OSB, chipboard, particle board, hardboard}
- B32B 37/18: involving the assembly of discrete sheets or panels only
- B32B 2260/028: Paper layer
- B32B 2260/046: Synthetic resin
- B32B 2307/544: Torsion strength; Torsion stiffness
- B32B 2307/718: Weight, e.g. weight per square meter
- B32B 2307/734: Dimensional stability
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM

## Abstract

A composite board composed of wood material with a middle layer (4) made of chipboard, wherein the middle layer is connected to at least one outer layer (2, 6) composed of fiberboard, wherein an artificial-resin-impregnated paper (3, 5 ) is arranged between the middle layer and the outer layer.

## Claims

### Claim 1

A composite board composed of wood material with a middle layer (4) made of chipboard, wherein the middle layer is connected to at least one outer layer (2, 6) composed of fiberboard, wherein an artificial-resin-impregnated paper (3, 5) is arranged between the middle layer and the outer layer.

### Claim 2 (depends on 1)

The composite board according to claim 1, wherein an artificial-resin-impregnated paper (3, 5) is used, wherein the weight of the paper is 15 g/m2 to 100 g/m2.

### Claim 3 (depends on 1)

The composite board according to claim 1, wherein the artificial-resin-impregnated paper (3, 5) comprises artificial resin in a quantity of 30 g/m2 to 200 g/m2.

### Claim 4 (depends on 1)

The composite board according to claim 1, wherein the artificial-resin-impregnated paper (3, 5) is impregnated with one or more of the artificial resins from the group, which includes urea, melamine, formaldehyde, phenol resin, epoxy resin as well as their mixtures and derivates.

### Claim 5 (depends on 1)

The composite board according to claim 1, wherein the artificial-resin-impregnated paper (3, 5) comprises an additive, which hinders or prevents a catching fire or a burning of the composite board (1).

### Claim 6 (depends on 1)

The composite board according to claim 1, wherein the middle layer (4) is provided with an outer layer (2, 6) on both sides.

### Claim 7 (depends on 1)

The composite board according to claim 1, wherein the outer layer (2, 6) comprises a board made of high-density or medium-density fiberboard.

### Claim 8 (depends on 1)

The composite board according to claim 1, wherein the outer layer (2, 6) has a board thickness of 1 mm to 5 mm.

### Claim 9 (depends on 1)

The composite board according to claim 1, wherein a further coating is applied to the outside (9) of at least one outer layer (2, 6) of the composite board (1).

### Claim 10 (depends on 9)

The composite board according to claim 9, wherein a coating is applied to the outside (9) of at least one outer layer (2, 6) as a further coating from the group, which comprises individually or in combination: paint, lacquer, HPL or veneer, paper, cardboard, wallpaper, film, textiles, fabric, felt, vinyl, leather, cork, stone surfaces, metals, metal foils, plastic coatings, polypropylene, polyethylene or polyvinyl acetate coatings, ceramic coatings, tiles, ceramic artificial resin mixtures, glass, writable films, magnetic coatings, radiation-resistant foils or plates, mineral fabric, organic, inorganic and synthetic fibers.

### Claim 11

A method for producing a composite board composed of wood material with a middle layer (4) composed of chipboard, wherein the middle layer is connected to at least one outer layer (2, 6) composed of fiberboard, characterized in that an artificial-resin-impregnated paper (3, 5) is arranged between the middle layer and the outer layer with the steps:
assembly of a pressing-material stack (10) comprising a middle layer (4), an artificial-resin-impregnated paper (3, 5) and at least one outer layer (2, 6), wherein the artificial-resin-impregnated paper is inserted between the middle layer and the outer layer, and
pressing of the pressing-material stack (10) to form a composite board (1).

### Claim 12 (depends on 11)

The method according to claim 11, wherein the pressing of the pressing-material stack (10) takes place at a high pressure and at a high temperature.

### Claim 13 (depends on 11)

The method according to claim 11, wherein the pressing of the pressing-material stack (10) to form a composite board (1) takes places through the softening of the artificial resin, with which the paper is impregnated, and the subsequent hardening of the artificial resin.

### Claim 14 (depends on 1)

The composite board according to claim 1, wherein the outer layer (2,6) has a board thickness of 1 mm to 2.5 mm.