Efficient infrared absorption system for edge sealing medium density fiberboard (MDF) and other engineered wood laminates using powder and liquid coatings

Patent metadata

Field	Value
Publication number	US-10857566-B2
Application number	US-201815978144-A
Country	US
Kind code	B2
Filing date	May 13, 2018
Priority date	Sep 15, 2015
Publication date	Dec 8, 2020
Grant date	Dec 8, 2020

Abstract

A method for coating and curing a material on a product having a plurality of edges and faces. More specifically, disclosed is an efficient method for coating and curing engineered wood products (EWP) in general, and the edges of EWP in particular.

First claim

What is claimed is:

1. A method for electrostatic deposition and curing of a material on a product having a plurality of edges and faces, the method comprising:
providing a continuous conveyor track for sequentially delivering the product to a preheat oven, a primer booth, a gel oven, a top coat booth, and a cure oven;
preheating the product in the preheat oven with at least one preheat catalytic heater, wherein the preheat oven is adaptable to heat the product to approximately 200 degrees Fahrenheit, to create a preheated product;
priming the preheated product in the primer booth adaptable to coat the plurality of edges and faces of the preheated product conveyed from the preheat oven with the material, to create a primed preheated product;
heating the primed preheated product in the gel oven with a catalytic heater, wherein the gel oven is adaptable to heat the rimed preheated product conveyed from the primer booth to approximately 300 degrees Fahrenheit, to create a gelled product;
top coating the gelled product in the top coat booth adaptable to top coat the plurality of faces and edges of the gelled product conveyed from the gel oven with a top coat, to create a top coated product having top coated faces and edges; and
curing the edges of the top coated product before curing the faces of the top coated product in the cure oven adaptable to heat the top coated product conveyed from the top coat booth to approximately 300 degrees Fahrenheit.

2. The method as in claim 1 wherein priming the preheated product further comprises electrostatically powder coating the plurality of faces and edges.

3. The method as in claim 1 wherein priming the preheated product further comprises liquid coating at least one of the plurality of faces and edges.

4. The method as in claim 1 wherein curing the edges of the top coated product comprises:
determining at least one infrared absorption characteristic of the material;
providing at least one edge sealing oven
having at least one focused infrared (IR) emitter assembly for radiating IR energy onto the edges;
matching the IR energy to the at least one infrared absorption characteristic;
radiating from the at least one focused IR emitter assembly the matched IR energy; and
reflecting the matched IR energy via a reflector onto the edges of the top coated product.

5. The method as in claim 4 further comprising selecting the reflector so that the matched IR energy that reaches the edges of the top coated product is substantially double the matched IR energy that reaches edges of the to coated product using another reflector.

6. The method as in claim 5 wherein the reflector is selected from the group consisting of a gold reflector and an opaque quartz glass reflector.

7. The method as in claim 4 wherein determining the at least one infrared absorption characteristic of the material further comprises determining the at least one infrared absorption characteristic of water.

8. The method as in claim 4 wherein determining the at least one preferential infrared absorption characteristic of the material further comprises determining the at least one preferential infrared absorption characteristic of polyethylene.

9. The method as in claim 4 wherein determining the at least one preferential infrared absorption characteristic of the material further comprises determining the at least one preferential infrared absorption characteristic of polyvinyl chloride molecule.

10. The method as in claim 4 wherein providing the at least one edge sealing oven having at least one focused infrared (IR) emitter assembly further comprises providing a transmission medium.

11. The method as in claim 10 wherein providing the transmission medium comprises providing a Fresnel lens transmission medium.

12. A method for curing a material on a product having a plurality of edges and faces;
providing a cure oven having at least one infrared edge sealing oven having at least one infrared emitter including at least one quartz lass component;
providing at least one infrared catalytic heater oven; and
connecting the at least one infrared edge sealing oven and the at least one infrared catalytic heater oven with a continuous conveyor track; and
curing the material in the cure oven so that the edges cure before the faces of the product.

13. The method as in claim 12 wherein providing a cure oven further comprises:
providing at least one infrared edge sealing oven, wherein providing the at least one infrared edge sealing oven comprises:
providing at least one focused infrared (IR) emitter assembly for radiating IR energy onto at least one of the plurality of edges, wherein the at least one focused infrared (IR) emitter assembly is selected from the group consisting of emitters adaptable to emitting a first radiation emission within a first infrared range of a spectra absorbed by a first molecule and emitters adaptable to emitting a second radiation emission within the first infrared range of the spectra absorbed by the first molecule; and
providing at least one multiplying reflector for effectively multiplying the emitted IR energy radiated onto the at least one of the plurality of edges compared to the emitted IR energy radiated onto the at least one of the plurality of edges using another reflector.

14. The method as in claim 13 wherein providing the at least one focused infrared (IR) emitter assembly further comprises providing a first focusing transmission medium lens.

15. The method as in claim 14 wherein providing the first focusing transmission medium lens further comprises providing a Fresnel lens.

16. The method as in claim 14 wherein providing the first focusing transmission medium lens further comprises providing a quartz glass lens.

Assignees

• Heraeus Noblelight Gmbh

Inventors

• Chapman Michael J

Classifications

• B05D7/06

  to wood · CPC title

• B05D2420/01

  first layer from the substrate side · CPC title

• B05D7/546

  each layer being cured, at least partially, separately · CPC title

• B05D3/0218

  Pretreatment, e.g. heating the substrate · CPC title

• B05D3/0263 Primary

  with IR heaters · CPC title