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1. WO1996005034 - WOOD VENEERS AND PRODUCTS THEREFROM HAVING ENHANCED STRENGTH AND STIFFNESS

Publication Number WO/1996/005034
Publication Date 22.02.1996
International Application No. PCT/US1995/010061
International Filing Date 08.08.1995
Chapter 2 Demand Filed 08.03.1996
IPC
B27K 5/06 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
27WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
KPROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING OR BLEACHING OF WOOD, OR FOR TREATING OF WOOD WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
5Staining or dyeing wood; Bleaching wood; Treating of wood not provided for in groups B27K1/ or  B27K3/105
06Softening or hardening wood
B27M 1/02 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
27WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
MWORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B-B27L79; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
1Working of wood not provided for in subclasses B27B-B27L79
02by compressing
B32B 21/13 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
32LAYERED PRODUCTS
BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
21Layered products essentially comprising wood, e.g. wood board, veneer, wood particle board
13all layers being exclusively wood
CPC
B27K 3/36
BPERFORMING OPERATIONS; TRANSPORTING
27WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
KPROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR
3Impregnating wood, ; e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
34Organic impregnating agents
36Aliphatic compounds
B27K 5/06
BPERFORMING OPERATIONS; TRANSPORTING
27WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
KPROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR
5Treating of wood not provided for in groups B27K1/00, B27K3/00
06Softening or hardening of wood
B27M 1/02
BPERFORMING OPERATIONS; TRANSPORTING
27WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
MWORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
1Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching
02by compressing
B32B 21/08
BPERFORMING OPERATIONS; TRANSPORTING
32LAYERED PRODUCTS
BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
21Layered products comprising ; a layer of; wood, e.g. wood board, veneer, wood particle board
04comprising wood as the main or only constituent of a layer ; , which is next to another layer of the same or of a different material
08of synthetic resin
B32B 21/13
BPERFORMING OPERATIONS; TRANSPORTING
32LAYERED PRODUCTS
BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
21Layered products comprising ; a layer of; wood, e.g. wood board, veneer, wood particle board
13all layers being exclusively wood
B32B 21/14
BPERFORMING OPERATIONS; TRANSPORTING
32LAYERED PRODUCTS
BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
21Layered products comprising ; a layer of; wood, e.g. wood board, veneer, wood particle board
14comprising wood board or veneer
Applicants
  • WEYERHAEUSER COMPANY [US]/[US]
Inventors
  • PARK, David, W.
  • HUNTER, Frank, R.
  • DIMAKIS, Alkiviadis, G.
Agents
  • OGDEN, Bryan, C.
Priority Data
08/290,34715.08.1994US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) WOOD VENEERS AND PRODUCTS THEREFROM HAVING ENHANCED STRENGTH AND STIFFNESS
(FR) PLACAGES DE BOIS ET PRODUITS DERIVES A RESISTANCE ET RIGIDITE AMELIOREES
Abstract
(EN)
Wood veneers having enhanced strength and/or stiffness, wood products made therefrom, and methods for manufacturing such veneers and wood products are disclosed. A treated veneer having enhanced strength and stiffness has a population of compacted wood cells extending across at least a portion of the length and width dimensions and into the thickness dimension of the veneer to confer an increased density level, and thus increased strength and/or stiffness levels, to the veneer. Interspersed in the compacted wood cells is a non-saturating loading level of a cured rigid thermoset material which maintains compaction of the compacted cells even after prolonged soaking in water. The preferred loading level is just what is required to maintain compaction of the cells. The preffered thermoset material is polyurea which is formed from a polyisocyanate resin appplied to at least one major surface of the veneer followed by hot-pressing the veneer. The strength and/or stiffness increase, compared to untreated veneer, is about 10 to 150 percent. Treated veneers can be made into various multiple-ply wood products such as laminated veneer lumber and plywood, thereby providing a way to convert relatively weak lumber from fast-grown trees into premium-grade construction material.
(FR)
On décrit des placages de bois à résistance et/ou rigidité améliorées, des produits de bois dérivés et des procédés de fabrication de ces placages et produits de bois. Un placage traité à résistance et rigidité améliorées, présente un ensemble de cellules ligneuses compactées sur une partie au moins de sa longueur, de sa largeur et de son épaisseur, ce qui lui confère une densité accrue, et donc des niveaux de résistance et ou de rigidité accrus. Dispersé dans ces cellules ligneuses compactées, on trouve un niveau de charge non saturant d'un matériau thermodurci, rigide et cuit, qui maintient le compactage des cellules compactées même après leur trempage prolongé dans l'eau. Le niveau de charge préféré est celui qui suffit juste à maintenir le compactage des cellules. Le matériau thermodurci préféré est la polyurée, formée à partir d'une résine de polyisocyanate, appliquée au moins sur une grande partie de la surface du placage, lequel est ensuite pressé à chaud. L'augmentation de la résistance et/ou de la rigidité varie de 10 à 150 % environ par rapport à un placage non-traité. Les placages traités peuvent prendre la forme de différents contreplacages de bois à couches multiples tels que des laminés de charpente et des contreplaqués, ce qui permet de transformer des bois de construction relativement tendres, provenant d'arbres à croissance rapide, en matériaux de construction de qualité supérieure.
Also published as
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