Method for producing an engineered wood board and engineered wood board production installation

• US 10,442,112 B2
• Filed: 12/15/2016
• Issued: 10/15/2019
• Est. Priority Date: 12/18/2015
• Status: Active Grant

• Current Assignee: SWISS KRONO Tec AG
• Original Assignee: SWISS KRONO Tec AG
• Inventors: Sperlich, Daniel, Richter, Andreas
• Primary Examiner(s): Koch, George R
• Application Number:
  US15/380,769
• Publication Number:
  US 20170173820A1
• Time in Patent Office: 1,034 Days
• Field of Search: 156 64
• CPC Class Codes: B27N 1/02 Mixing the material with binding agent mixing in general B01F
• CPC Class Codes: B27N 1/029 Feeding; Proportioning; Controlling
• CPC Class Codes: B27N 3/002 characterised by the type of binder compositions of macromolecular compounds C08L
• CPC Class Codes: B27N 3/04 from fibres
• CPC Class Codes: B27N 3/18 Auxiliary operations, e.g. preheating, humidifying, cutting-off
• CPC Class Codes: B27N 7/005 Coating boards, e.g. with a finishing or decorating layer

Abstract

A method for producing an engineered wood board. The method includes production of the substrate and application of a fluid to an application area of the substrate by means of an applicator, where the monitoring of the application occurs by means of an infra-red camera such that an inhomogeneity of the application can be detected.

Claims

1. A method for producing an engineered wood board, comprising:

(a) production of a substrate;

(b) application of a fluid onto an application area of the substrate by means of an applicator; and

(c) monitoring of the application of the fluid onto the application area of the substrate by an infra-red camera such that an inhomogenity of the application of the fluid is recorded,

wherein;

the production of the substrate comprises a scattering of wood fibres coated in an adhesive that results in a pressed fibre mat;

the fluid is applied to the fibre mat after the scattering;

the fibre mat is pressed to form an engineered wood board following the application of the fluid; and

the infrared camera automatically monitors the application of the fluid in a discharge area behind the application area of the fluid by monitoring a temporal temperature distribution at the application area that is caused by the application of the fluid to determine an inhomogeneity of the temperature in the discharge area.

2. The method according to claim 1, wherein the monitoring of the application occurs with the infra-red camera by recording the inhomogeneity of the application by means of the temperature change effected by the application of the fluid.

3. The method according to claim 1, wherein:

(a) the pressed fibre mat is pressed to form an engineered wood board using a hot press following the application of the fluid.

4. The method according to claim 3, wherein the hot press is a heated belt press.

5. The method according to claim 1, wherein:

the substrate has a substrate temperature in a material flow direction in front of the applicator; and

the fluid has a fluid temperature during application that differs from the substrate temperature by at least 1 Kelvin.

6. The method according to claim 5, wherein the temperature is at least 5 Kelvin.

7. The method according to claim 1, further comprising:

continuous automatic recording of an inhomogeneity parameter that describes an inhomogeneity in the application of the fluid; and

emission of a signal if the inhomogeneity parameter deviates from a predetermined nominal value by more than a predetermined threshold value, or indication of the inhomogeneity parameter.

8. The method according to claim 7, wherein the inhomogeneity parameter describes an application area temperature difference within the application area.

9. The method according to claim 1, wherein the application involves spraying.

10. The method according to claim 9, wherein the spraying is an atomisation.

11. An engineered wood board production installation that is designed for producing an engineered wood board, comprising:

(a) a substrate production installation for producing a substrate;

(b) an applicator for applying a fluid to an application area of the substrate; and

(c) an infra-red camera that is designed for automatic recording in a discharge area behind at least one part of the application area of the fluid such that an inhomogeneity of the application of the fluid can be recorded and the infrared camera monitors the application of the fluid by means of monitoring a change of temperature that is caused by the application of the fluid in the discharge area.

12. The engineered wood board production installation according to claim 11, wherein the applicator is designed to apply the fluid at a temperature that differs from a substrate temperature, which the substrate exhibits prior to the application, by at least 1 Kelvin.

13. The engineered wood board production installation according to claim 12, wherein the temperature is at least 5 Kelvin.

14. The engineered wood board production installation according to claim 11, wherein the infra-red camera is part of an inhomogeneity monitoring device, which is installed for:

continuous automatic recording of an inhomogeneity parameter that describes an inhomogeneity in the application of synthetic resin, and

automatic emission of a signal if the inhomogeneity parameter deviates from a nominal value by more than a predetermined threshold value.

15. The engineered wood board production installation according to claim 11, wherein the inhomogeneity of the application of the fluid monitored by the infrared camera is used to determine if the applicator is not working properly or a liquid tank containing the fluid is empty.

16. A method for producing an engineered wood board, comprising:

(a) application of a fluid synthetic resin onto an application area of a substrate;

(b) monitoring, in an area behind the application area, the application of the fluid synthetic resin by an infra-red camera which monitors a change of temperature that is caused by the application of the fluid synthetic resin;

(c) determining an inhomogeneity of the temperature of the fluid synthetic resin in the area behind the application area, based on the monitoring; and

(d) pressing the substrate into a fibre mat to form an engineered wood board, prior to the application of the fluid synthetic resin;

wherein the application of the fluid synthetic resin is onto a moulding skin of the engineered wood board.

17. The method according to claim 16, wherein the fluid synthetic resin contains a melamine resin and/or a urea resin.

18. The method according to claim 16, wherein the substrate comprises a scattering of wood fibres coated in an adhesive that results in the pressed fibre mat and a fluid is applied to the fibre mat after the scattering.

19. The method according to claim 16, wherein the determining of the inhomogeneity of the application of the fluid synthetic resin is used to determine if an applicator is not working properly or a liquid tank containing the fluid synthetic resin is empty.

20. A method for producing an engineered wood board, comprising:

(a) production of a substrate;

(b) application of a fluid onto an application area of the substrate by means of an applicator; and

(c) monitoring of the application of the fluid onto the application area of the substrate by an infra-red camera such that an inhomogenity of the application of the fluid is recorded,

wherein;

the application of the fluid is an application onto a moulding skin of the engineered wood board;

the fluid is a fluid synthetic resin and contains a melamine resin and/or a urea resin; and

the infrared camera automatically monitors the application of the fluid in a discharge area behind the application area of the fluid by monitoring a temporal temperature distribution at the application area that is caused by the application of the fluid to determine an inhomogeneity of the temperature in the discharge area.

21. The method according to claim 20, wherein

the moulding skin is an unpolished moulding skin.

22. The method according to claim 20 further comprising:

application of at least one paper layer impregnated with a synthetic resin on an upper side and/or a lower side of an engineered wood board, resulting in a paper-coated engineered wood board; and

pressing of the paper-coated engineered wood board such that the synthetic resin fuses and the paper layer bonds with the engineered wood board,

where the fluid is applied in the form of prior to the application of the paper layer.

23. The method according to claim 22, wherein the least one paper layer, is a decorative paper layer and the fluid is a fluid synthetic resin.

24. The method according to claim 20, wherein the application involves spraying.