METHOD OF MAKING A WOOD FIBER BOARD HAVING A RELIEF-TEXTURED SURFACE

• US 3,880,687 A
• Filed: 10/04/1972
• Issued: 04/29/1975
• Est. Priority Date: 10/04/1972
• Status: Expired due to Term

• Current Assignee: Armin Elmendorf, Roland Etzold
• Original Assignee: Armin Elmendorf, Roland Etzold
• Inventors: Etzold, Roland, Elmendorf, Armin
• Primary Examiner(s): Dier, Philip
• Application Number:
  US05/295,067
• Time in Patent Office: 937 Days
• Field of Search: 161/116,124,125,117,122,162,164 156/153,62.2 264/112-113
• US Class Current: 156/62.2
• CPC Class Codes: B27N 5/00 Manufacture of non-flat articles
• CPC Class Codes: B27N 7/00 After-treatment, e.g. reducing swelling or shrinkage, surfacing; Protecting the edges of boards against access of humidity
• CPC Class Codes: B32B 2367/00 Polyesters, e.g. PET, i.e. polyethylene terephthalate
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B44C 1/221 using streams of abrasive particles
• CPC Class Codes: B44C 5/043 containing wooden elements
• CPC Class Codes: Y10T 428/24372 Particulate matter
• CPC Class Codes: Y10T 428/24438 Artificial wood or leather grain surface
• CPC Class Codes: Y10T 428/24562 Interlaminar spaces
• CPC Class Codes: Y10T 428/24983 Hardness

Abstract

In obtaining a texture or a pattern on a wood fiber board by conventional procedures, as by means of a die, high pressures must be used so that the material of which the board is made is compacted and generally made denser and harder in the depressions of the textured surface. In the process of relief-texturing of the present invention the reverse takes place. Hard surfaces are first created in one plane adjacent to softer areas in the same plane. Particles are then removed from the softer areas by abrasive means that pass over both hard and soft areas creating depressions that lie below the plane of the hard areas.

Claims

1. The method of making a relief-textured surface on a wood fiber board comprising the steps of:

creating areas on at least one side of the board with the use of initially loose wood particles with certain of such areas being harder than adjacent softer areas and all areas lie in the same plane, abrading the entire surface, thereby removing fibers primarily from the softer areas and keeping the harder areas substantially flat in a plane outwardly of the softer areas.

2. The method of making a wood fiber board having a relief-textured surface comprising the steps of:

providing a mat of wood particles coated with a thermo-setting resin;

pre-curing the resin in certain areas of the surface of the mat on at least one side, consolidating the mat under heat and pressure, thereby creating areas that are harder than adjacent areas and causing all areas to be in the same plane, abrading the entire surface, thereby removing particles at the surface of the pre-cured areas and producing a board having hard areas that lie in a plane outwardly of the adjacent abraded areas.

3. The method as set forth in claim 2, wherein pre-curing is obtained by adding moisture to limited separate areas of the mat, then subjecting the mat to contact hot plate pressure thereby pre-curing the resin in the areas between the moistened areas without appreciably pre-curing the resin in the moistened areas.

4. The method of making a board having a relief-textured surface comprising the steps of:

providing a mat of binder-coated wood shavings;

creating limited areas of higher binder content on at least one surface of the mat;

consolidating the mat under pressure until the binder has hardened, whereby said areas of higher binder content are made harder than the adjacent areas, removing particles at the surface from the areas of lower binder content, thereby producing hard areas that lie in a plane outwardly of valleys.

5. The method as set forth in claim 4, wherein the binder added is in the form of a liquid.

6. The method as set forth in claim 4, wherein the binder added in the areas of higher binder content is in the form of a powder.

7. The method of making a board having a relief-textured surface which consists in, providing a mat of wood shavings coated with portland cement, providing the mat with a surface of cement and a mineral filler having a cement retarder in limited areas of the surface, subjecting the mat and its surfacing to pressure until the cement in the areas without retarder has set, removing the board so formed under pressure, and abrading the entire surface before the cement in the retarded areas has set, thereby removing particles from limited areas in the surface and producing depressions in the cement coat, the bottom of the pits being below the plane of the hard area.

8. The method of making a board having a relief-textured surface which consists in, providing a mat of wood shavings coated with an inorganic cement, providing the mat with a surface layer comprising inorganic cement and a mineral filler, the surface layer containing small masses of particles without a binder, subjecting the mat and its surface layer to pressure until the cement has set, removing the board so formed from pressure, then removing the small masses of particles which contain no binder and thereby creating a surface having pits whose bottom lies below a surface composed of cement and a mineral filler.

9. The method of making a board having a relief-textured surface which consists in, providing a mat of resin coated shavings, providing the mat with a surface of fine resin-coated particles, containing small masses of uncoated particles, allowing the resin to set under heat and pressure, then removing the uncoated masses of particles, thereby creating a surface having pits.

10. The method of making a wood fiber board having a relief-textured surface comprising the steps of, providing a mat of wood particles coated with a thermo-setting resin, providing the mat with a thin layer of fine resin coated particles having a moisture content below that necessary for good bonding, adding moisture to limited areas of the thin layer, consolidating the mat under heat and pressure, thereby producing hard and soft areas lying in the same plane, abrading the entire surface, thereby removing particles from the soft areas.

11. The method of making a board having a relief-textured surface which consists in, providing small masses of uncoated particles on a metal plate, forming a mat of wood particles coated with a binder thereon, subjecting the mat and masses of uncoated particles to pressure until the binder has set, removing the board so formed from pressure, then removing the uncoated masses of particles from the surface, thereby creating a surface having pits.