Wood treatment process

• US 6,217,939 B1
• Filed: 11/17/1999
• Issued: 04/17/2001
• Est. Priority Date: 11/17/1998
• Status: Expired due to Term

• Current Assignee: Rainer Buchmann
• Original Assignee: Martin Menz
• Inventors: Sailer, Michael, Rapp, Andreas Otto
• Primary Examiner(s): CAMERON, ERMA C
• Application Number:
  US09/441,370
• Time in Patent Office: 517 Days
• Field of Search: 427/317, 427/325, 427/441, 427/351, 427/379, 427/382, 427/393, 427/369, 427/370
• US Class Current: 427/325
• CPC Class Codes: B27K 3/0207 Pretreatment of wood before impregnation
• CPC Class Codes: B27K 3/48 Mineral oil
• CPC Class Codes: B27K 5/0085 Thermal treatments, i.e. involving chemical modification of wood at temperatures well over 100°C
• CPC Class Codes: F26B 2210/16 Wood, e.g. lumber, timber
• CPC Class Codes: F26B 7/00 Drying solid materials or objects by processes using a combination of processes not covered by a single one of groups F26B3/00 and F26B5/00 F26B1/005, F26B5/04, F26B23/026 take precedence

Abstract

A wood treatment process in which lignocellulosic materials are treated for several hours in a liquid bath of oil with the exclusion of oxygen. The liquid bath at that time has a temperature of 180 to 260° C. By thermal action the wood substance is converted, so that some properties of these materials are altered. Resistance against wood-destroying fungi, for example, is improved.

Claims

1. A process for treating wood comprising immersing wood in an oil bath at 180°

C. to 260°

C. for for at least a few hours to achieve thermal conversion of lignocellulosic materials.

2. A process for treating wood according to claim 1, further comprising impregnating the lignocellulosic materials after being thermally converted with an oil which is altered during the thermal conversion of the lignocellulosic materials due to resins and pyrolysis products that seep out of the wood into the oil thereby altering the constitution of the oil.

3. A process according to claim 1, wherein said oil is a vegetable oil.

4. A process according to claim 1, further comprising treating said wood in said oil bath with the exclusion of oxygen.

5. A process according to claim 1, further comprising treating said wood in said oil bath at a pressure of 2 bar to 14 bar.

6. A process according to claim 5, further comprising treating said wood in said oil bath with the exclusion of oxygen.

7. A process according to claim 1, further comprising cooling the oil bath after the end of the thermal conversion, removing the wood from the bath, exposing the wood to air at room climate and then heating the wood in an air atmosphere at 60 to 280°

C. to form a hardened oil film on the surface of the wood.