ATE52958T1 - PROCESS FOR COMPACTION OF LOW DENSITY WOODS. - Google Patents

PROCESS FOR COMPACTION OF LOW DENSITY WOODS.

Info

Publication number
ATE52958T1
ATE52958T1 AT86301862T AT86301862T ATE52958T1 AT E52958 T1 ATE52958 T1 AT E52958T1 AT 86301862 T AT86301862 T AT 86301862T AT 86301862 T AT86301862 T AT 86301862T AT E52958 T1 ATE52958 T1 AT E52958T1
Authority
AT
Austria
Prior art keywords
wood
ammonia
moisture content
densified
thickness
Prior art date
Application number
AT86301862T
Other languages
German (de)
Inventor
Peter Favot
Original Assignee
Peter Favot
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Peter Favot filed Critical Peter Favot
Application granted granted Critical
Publication of ATE52958T1 publication Critical patent/ATE52958T1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, 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; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K1/00—Damping wood
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, 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; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
    • B27K3/16—Inorganic impregnating agents
    • B27K3/20—Compounds of alkali metals or ammonium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, 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; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
    • B27K5/06—Softening or hardening of wood
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
    • B27M1/00—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching
    • B27M1/02—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching by compressing

Abstract

Low quality, low density woods are densified to form wood products having the characteristics of high quality natural hardwoods. A green solid wood member having a high moisture content is impregnated with anhydrous ammonia to plasticize the wood into a sponge-like form saturated with water and ammonia. This plasticized wood member is placed between press plates of a cyclic press and, while maintaining the temperature of the wood below 100 DEG C, it is subjected to a plurality of low pressure compression cycles each of about 1/2 to 1 minute duration with the wood being compressed to a predetermined thickness of up to 50% less than its original thickness. It is held at the reduced thickness for a short time and released during each cycle, whereby water and ammonia are squeezed out of the wood down to a moisture content of less than about 30%. The damp wood member of reduced thickness thus obtained is then dried to obtain a kiln dried, densified solid wood product. This method may be used to densify wood planks, pre-glued laminates and thin veneers. For veneers, a simpler pressing system and higher temperatures may be used.
AT86301862T 1985-03-15 1986-03-14 PROCESS FOR COMPACTION OF LOW DENSITY WOODS. ATE52958T1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA000476650A CA1236255A (en) 1985-03-15 1985-03-15 Process for densifying low density woods
EP86301862A EP0197674B1 (en) 1985-03-15 1986-03-14 Process for densifying low density woods

Publications (1)

Publication Number Publication Date
ATE52958T1 true ATE52958T1 (en) 1990-06-15

Family

ID=4130037

Family Applications (1)

Application Number Title Priority Date Filing Date
AT86301862T ATE52958T1 (en) 1985-03-15 1986-03-14 PROCESS FOR COMPACTION OF LOW DENSITY WOODS.

Country Status (4)

Country Link
EP (1) EP0197674B1 (en)
AT (1) ATE52958T1 (en)
CA (1) CA1236255A (en)
DE (1) DE3671403D1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2658750A1 (en) * 1990-02-26 1991-08-30 Ober Ind Process of manufacture, starting with bulk or veneering, sawn, sectioned or unwound wood, of densified and hard panels
GB2265915A (en) * 1992-04-04 1993-10-13 Woodform Design Limited Bending and shaping MDF
GB2265914A (en) * 1992-04-04 1993-10-13 Hoffman Thornwood Plc Method of plasticising medium density fibre board
ES2091087T3 (en) * 1993-04-29 1996-10-16 Shell Int Research PROCEDURE TO IMPROVE THE QUALITY OF LOW QUALITY WOOD.
FR2796586B1 (en) 1999-07-20 2001-10-12 Frederic Voisin METHOD AND DEVICE FOR COMPRESSING, BENDING AND JOINING SADDLES TO MANUFACTURE BARRELS OR BARRELS
CZ304024B6 (en) * 2008-12-02 2013-08-28 Mendelova zemedelská a lesnická univerzita v Brne Method of uniform areal compression of wood, especially spruce
SE534884C2 (en) * 2010-04-28 2012-01-31 Mb Aedeltrae Ab Method for processing a disc as well as a disc element
JP6530865B2 (en) * 2016-07-01 2019-06-12 公立大学法人北九州市立大学 Method of manufacturing laminated wood

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3282313A (en) * 1964-11-24 1966-11-01 Research Corp Method of forming wood and formed wood product
FI43008B (en) * 1969-06-10 1970-09-02 Neste Oy
AT326339B (en) * 1971-09-14 1975-12-10 Inst Khim Drevesiny Akademii N PROCESS FOR COMPACTING SOLID WOOD

Also Published As

Publication number Publication date
EP0197674A1 (en) 1986-10-15
EP0197674B1 (en) 1990-05-23
CA1236255A (en) 1988-05-10
DE3671403D1 (en) 1990-06-28

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Legal Events

Date Code Title Description
UEP Publication of translation of european patent specification
REN Ceased due to non-payment of the annual fee