SE446702B - PROCEDURE FOR HARDGORING AND STABILIZING THREE - Google Patents

PROCEDURE FOR HARDGORING AND STABILIZING THREE

Info

Publication number
SE446702B
SE446702B SE8008814A SE8008814A SE446702B SE 446702 B SE446702 B SE 446702B SE 8008814 A SE8008814 A SE 8008814A SE 8008814 A SE8008814 A SE 8008814A SE 446702 B SE446702 B SE 446702B
Authority
SE
Sweden
Prior art keywords
wood
temperature
mpa
heated
compressed
Prior art date
Application number
SE8008814A
Other languages
Swedish (sv)
Other versions
SE8008814L (en
Inventor
O Hoel
Original Assignee
Tarkett Ab
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 Tarkett Ab filed Critical Tarkett Ab
Priority to SE8008814A priority Critical patent/SE446702B/en
Priority to DE19813148120 priority patent/DE3148120A1/en
Priority to NO814250A priority patent/NO154910C/en
Priority to DK555381A priority patent/DK156626C/en
Priority to FI814020A priority patent/FI73621C/en
Publication of SE8008814L publication Critical patent/SE8008814L/en
Publication of SE446702B publication Critical patent/SE446702B/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
    • B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
    • B27K5/001—Heating
    • 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

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Mechanical Engineering (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Disintegrating Or Milling (AREA)

Description

446 702 10 15 20 25 30 35 2 egenskaper. Cellulosaskelettet kan i sig självt endast upptaga dragkrafter. För att kunna motstå tryckkrafter måste en utslagning av de svagare cellulosasträngarna förhindras, och detta kan ske tack vare att de är in- bäddade i lignin. Ligninhalten i trä är därför av störs- ta betydelse för dess tryckhâllfasthet. Detta faktum har redan tidigt pâtalats av Trendelenburg i publikationen "Das Holz als Rohstoff” Leipzig-Berlin, 1939, vari det med diagram och siffermaterial fastslås, att en stigan- de ligninhalt i träet åstadkommer en betydande ökning av hâllfasthetsegenskaperna. Ändamålet med föreliggande uppfinning är att medelst träets eget lignin ytterligare förstärka cellväggarna och uppfinningen grundar sig på det faktum, att ligninet börjar mjukna vid ca +l00°C, medan cellulosan i huvud- sak förblir intakt vid temperaturer mellan +l0O°C och +250°C. Vid temperaturer upp till +75°C är däremot lig- ninet mycket hårt och relativt sprött, medan cellulosan är flexibel. Ändamålet uppnås därigenom att träet uppvär- mes till en temperatur av 75-160°C, företrädesvis 120-1S0°C, i syfte att mjukgöra ligninkomponenten däri och komprimeras i anslutning till uppvärmningen med bibehållen temperatur av 75-160°C genom mekanisk press- ning vid ett presstryck av 5-100 MPa, företrädesvis 5-30 MPa, under o,1-so'sek. 446 702 10 15 20 25 30 35 2 properties. The cellulose skeleton itself can only absorb tensile forces. In order to withstand compressive forces, knockout of the weaker cellulose strands must be prevented, and this can be done because they are embedded in lignin. The lignin content in wood is therefore of the greatest importance for its compressive strength. This fact has been pointed out at an early stage by Trendelenburg in the publication "Das Holz als Rohstoff" Leipzig-Berlin, 1939, in which it is established with diagrams and figures that a rising lignin content in the wood causes a significant increase in the strength properties. to further strengthen the cell walls by means of the wood's own lignin and the invention is based on the fact that the lignin begins to soften at about + 100 ° C, while the cellulose remains essentially intact at temperatures between + 10 ° C and + 250 ° C. up to + 75 ° C, on the other hand, the lignin is very hard and relatively brittle, while the cellulose is flexible, the purpose being achieved by heating the wood to a temperature of 75-160 ° C, preferably 120-1S0 ° C, in order to soften the lignin component therein and compress in connection with the heating with a maintained temperature of 75-160 ° C by mechanical pressing at a pressing pressure of 5-100 MPa, preferably 5-30 MPa, for 0.1 so-sec .

Uppfinningen utnyttjar praktiskt sålunda ovannämnda egenskaper hos trä, vilket överraskande resulterar i att om man komprimerar trä vid en temperatur mellan +75°C och +l60°C med tryck mellan 5 MPa och 20 MPa kan den komprimerade volymen reduceras till ca hälften av den ursprungliga volymen samtidigt som den procentuella ök- ningen av lignin i de komprimerade delarna åstadkommer en avsevärd hâllfasthetsökning. Dessutom bidrager i ve- den ingående terpener och hartser till att sammanbinda trästrukturen och åstadkomma en mera hydrofob produkt, varigenom trämaterialet blir mera okänsligt för fuktvaria- tioner. 10 15 20 446 702 3 .The invention practically thus utilizes the above-mentioned properties of wood, which surprisingly results in that if wood is compressed at a temperature between + 75 ° C and + 160 ° C with a pressure between 5 MPa and 20 MPa, the compressed volume can be reduced to about half of the original the volume at the same time as the percentage increase of lignin in the compressed parts achieves a considerable increase in strength. In addition, the terpenes and resins contained in the wood help to bond the wood structure together and create a more hydrophobic product, whereby the wood material becomes more insensitive to moisture variations. 10 15 20 446 702 3.

Uppfinningen är.inte begränsad till några särskilda träslag, utan kan tillämpas på olika slag av såväl löv- som barrträ.The invention is not limited to any particular types of wood, but can be applied to different types of both hardwood and softwood.

Uppfinningen skall i det följande närmare förklaras medelst ett utföringsexempel.The invention will be explained in more detail below by means of an exemplary embodiment.

UTFÖRINGSEXEMPEL I samband med fanertorkning uttogs ca 3 mm tjocka furufaner från en kontinuerligt arbetande fanertork med driftstemperaturen +l50°C. Med bibehållen temperatur pressades faneren i valspress, ävenledes vid en drifts- temperatur av +l50°C. Presstiden beräknades till l se- kund och presstrycket uppgick till 18 MPa. Efter den här beskrivna behandlingen erhölls formstabila faner, som uppvisade en anmärkningsvärd ökad hårdhet.EMBODIMENT EXAMPLE In connection with veneer drying, approx. 3 mm thick pine veneers were removed from a continuously operating veneer dryer with an operating temperature of + 150 ° C. With the temperature maintained, the veneer was pressed in a roller press, also at an operating temperature of + 150 ° C. The pressing time was estimated at 1 second and the pressing pressure was 18 MPa. After the treatment described here, dimensionally stable veneers were obtained, which showed a remarkably increased hardness.

Faner, som nedtorkats till 9% fuktkvot och därefter omedelbart komprimerats enligt uppfinningen hade efter nedkylning till rumstemperatur en hårdhet av 7 kg/mmz medan faner, som enbart nedtorkats till 9% fuktkvot, efter nedkylning till rumstemperatur hade en hårdhet av 2 1,5 kg/mm .Veneers, which were dried to 9% moisture content and then immediately compressed according to the invention, had a hardness of 7 kg / mm 2 after cooling to room temperature, while veneers, which were only dried to 9% moisture content, had a hardness of 2 1.5 kg after cooling to room temperature. / mm.

Claims (4)

446 702 S 10 15 20 PATENTKRAV446 702 S 10 15 20 PATENT REQUIREMENTS 1. Förfarande för hárdgöring och stabilisering av trä, som är nedtorkat till en fuktkvot understigande fibermättnadspunkten, k ä n n e t e c k n a t därav, _att träet uppvärmes till en temperatur av 75-160°C, företrädesvis 120-150°C, 1 syfte att mjukgöra lignin- komponenten däri och komprimeras i anslutning till upp- värmningen med bibehållen temperatur av 75-160°C genom mekanisk pressning vid ett presstryck av S-100 MPa, företrädesvis 5-30 MPa, under 0,1-60 sek. lA process for hardening and stabilizing wood which has been dried to a moisture content below the fiber saturation point, characterized in that the wood is heated to a temperature of 75-160 ° C, preferably 120-150 ° C, for the purpose of softening the lignin. component therein and is compressed in connection with the heating with a maintained temperature of 75-160 ° C by mechanical pressing at a press pressure of S-100 MPa, preferably 5-30 MPa, for 0.1-60 sec. l 2. Förfarande enligt patentkravet 1, k ä n n e - t e c k n a t därav, att träet uppvärmes 1 konventio- nella torkapparater för sàgat virke eller faner.2. A method according to claim 1, characterized in that the wood is heated in conventional dryers for sawn timber or veneer. 3. Förfarande enligt krav 1 eller 3, k ä n n e - t e c k n a to därav, att hela behandlingsprocessen, bestående av värmning och pressning utföres som en kon- tinuerlig produktionsprocess.3. A method according to claim 1 or 3, characterized in that the whole treatment process, consisting of heating and pressing, is carried out as a continuous production process. 4. Förfarande enligt krav 1 eller 3, k ä n n e - t e c k n a t därav, att träet utgöres av faner, som uppvärmes till en temperatur av 120-150°C och därefter i ett kontinuerligt produktionsförfarande komprimeras i ett valsverk vid en temperatur av 120-150°C och ett presstryck av 7-30 MPa under en tid av 0,5-60 sek samt därefter kyles till rumstemperatur.4. A method according to claim 1 or 3, characterized in that the wood consists of veneer, which is heated to a temperature of 120-150 ° C and then in a continuous production process is compressed in a rolling mill at a temperature of 120-150 ° C and a compression pressure of 7-30 MPa for a period of 0.5-60 sec and then cooled to room temperature.
SE8008814A 1980-12-16 1980-12-16 PROCEDURE FOR HARDGORING AND STABILIZING THREE SE446702B (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
SE8008814A SE446702B (en) 1980-12-16 1980-12-16 PROCEDURE FOR HARDGORING AND STABILIZING THREE
DE19813148120 DE3148120A1 (en) 1980-12-16 1981-12-04 Process for hardening and stabilising wood
NO814250A NO154910C (en) 1980-12-16 1981-12-14 PROCEDURES FOR HARDENING AND STABILIZATION OF FINES.
DK555381A DK156626C (en) 1980-12-16 1981-12-15 PROCEDURES FOR HARDENING AND STABILIZING FINES
FI814020A FI73621C (en) 1980-12-16 1981-12-15 Procedures for hardening and stabilizing veneers.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE8008814A SE446702B (en) 1980-12-16 1980-12-16 PROCEDURE FOR HARDGORING AND STABILIZING THREE

Publications (2)

Publication Number Publication Date
SE8008814L SE8008814L (en) 1982-06-17
SE446702B true SE446702B (en) 1986-10-06

Family

ID=20342473

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8008814A SE446702B (en) 1980-12-16 1980-12-16 PROCEDURE FOR HARDGORING AND STABILIZING THREE

Country Status (5)

Country Link
DE (1) DE3148120A1 (en)
DK (1) DK156626C (en)
FI (1) FI73621C (en)
NO (1) NO154910C (en)
SE (1) SE446702B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995013908A1 (en) * 1993-11-18 1995-05-26 Curt Lindhe Process for producing hard elements of wood
WO1996026054A1 (en) * 1995-02-24 1996-08-29 Curt Lindhe A method of producing impregnated wooden products
US6053224A (en) * 1995-04-13 2000-04-25 Asea Brown Boveri Ab Device for pressure treatment of wood

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2804629A1 (en) * 2000-01-21 2001-08-10 D Abadie Humberto Roque Carril Procedure for converting cottonwood into high grade wood, comprises controlled stages of felling, cutting, release of water and resin,drying, immersion, release of impurities, modeling and surfacing
FI114785B (en) * 2002-06-12 2004-12-31 Jaakko Kause Process for producing a weatherproof and weather resistant as well as its properties as well as hardwood wood product
NL1023267C2 (en) * 2003-04-25 2004-10-27 Shen-Ba Lee Timber producing method involves applying pressure to each pressing plate to compress piece of timber including heartwood after desired pressure is applied to timber piece
FR2854095B1 (en) * 2003-04-28 2006-07-21 Shen Ba Lee METHOD FOR MANUFACTURING A WOODEN COMPONENT COMPRISING THE WOOD-HEART
US20200331164A1 (en) 2017-12-29 2020-10-22 AHF, LLC d/b/a AHF Products Densified wood including process for preparation

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE291945C (en) * 1915-06-25
US2666463A (en) * 1949-02-21 1954-01-19 Weyerhaeuser Timber Co Method of densifying wood

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995013908A1 (en) * 1993-11-18 1995-05-26 Curt Lindhe Process for producing hard elements of wood
US5678618A (en) * 1993-11-18 1997-10-21 Lindhe; Curt Process for producing hard elements of wood
WO1996026054A1 (en) * 1995-02-24 1996-08-29 Curt Lindhe A method of producing impregnated wooden products
US6053224A (en) * 1995-04-13 2000-04-25 Asea Brown Boveri Ab Device for pressure treatment of wood

Also Published As

Publication number Publication date
DE3148120C2 (en) 1992-04-09
FI814020L (en) 1982-06-17
DK156626C (en) 1990-03-12
NO154910C (en) 1987-01-14
NO154910B (en) 1986-10-06
FI73621C (en) 1987-11-09
NO814250L (en) 1982-06-17
SE8008814L (en) 1982-06-17
FI73621B (en) 1987-07-31
DK156626B (en) 1989-09-18
DK555381A (en) 1982-06-17
DE3148120A1 (en) 1982-08-05

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