DK156626B - PROCEDURES FOR HARDENING AND STABILIZING FINES - Google Patents
PROCEDURES FOR HARDENING AND STABILIZING FINES Download PDFInfo
- Publication number
- DK156626B DK156626B DK555381A DK555381A DK156626B DK 156626 B DK156626 B DK 156626B DK 555381 A DK555381 A DK 555381A DK 555381 A DK555381 A DK 555381A DK 156626 B DK156626 B DK 156626B
- Authority
- DK
- Denmark
- Prior art keywords
- veneer
- mpa
- wood
- temperature
- compressed
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 7
- 230000000087 stabilizing effect Effects 0.000 title claims description 3
- 238000000915 furnace ionisation nonthermal excitation spectrometry Methods 0.000 title 1
- 229920005610 lignin Polymers 0.000 claims description 10
- 238000003825 pressing Methods 0.000 claims description 4
- 239000000835 fiber Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000010924 continuous production Methods 0.000 claims 1
- 238000005096 rolling process Methods 0.000 claims 1
- 239000002023 wood Substances 0.000 description 15
- 229920002678 cellulose Polymers 0.000 description 5
- 239000001913 cellulose Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 241000779819 Syncarpia glomulifera Species 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229920002488 Hemicellulose Polymers 0.000 description 1
- 241000218657 Picea Species 0.000 description 1
- 210000002421 cell wall Anatomy 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000001739 pinus spp. Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 229940036248 turpentine Drugs 0.000 description 1
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
DK 156626 BDK 156626 B
Opfindelsen angâr en fremgangsmâde til hærdning og sta-bilisering af finér til forbedring af træmaterialets me-kaniske egenskaber, navnlig dets trykstyrke og over-fladehârdhed.The invention relates to a method for curing and stabilizing veneers to improve the mechanical properties of the wood material, in particular its compressive strength and surface hardness.
55
Det er kendt at hærde og stabilisere træ ved i et vist omfang at fylde porerne med monomère kemiske forbindel-ser, der derefter bringes til at polymerisere "in situ".It is known to cure and stabilize wood by to some extent filling the pores with monomeric chemical compounds which are then made to polymerize "in situ".
Cellevævet kan sâledes forstærkes med plastprodukter, 10 der inden for visse grænser kan vælges efter de krav, der stilles med hensyn til de 0nskede egenskaber ved det færdige træmateriale. Sâdanne imprægneringsmetoder er dog som oftest temmelig bekostelige, og desuden ændres træets naturlige udseende pâ en ofte u0nsket mâde.The cellular tissue can thus be reinforced with plastic products which, within certain limits, can be selected according to the requirements set for the desired properties of the finished wood material. However, such impregnation methods are usually quite costly, and in addition, the natural appearance of the wood changes in an often undesirable way.
1515
Fra f.eks. det svenske patentskrift nr. 216 911 er det kendt at stabilisere og samtidig t0rre træ med et fug-tighedsindhold/ der overstiger fibermætningspunktet, ved at der ved en temperatur pâ 110 °C-200 °C ud0ves et 20 pressetryk pâ h0jst 100 kg/cm2 vinkelret pâ træets fiberretning. T0rring angives i visse nærmere anf0rte tilfælde at kunne gennemf0res pâ 1/2 op til 5 timer.From e.g. in Swedish Patent Specification No. 216 911 it is known to stabilize and simultaneously dry wood with a moisture content / exceeding the fiber saturation point, by exerting a pressure at a temperature of 110 ° C-200 ° C at a maximum pressure of 100 kg / cm2. perpendicular to the fiber direction of the tree. Drying is stated in certain specified cases to be possible in 1/2 up to 5 hours.
If0lge den svenske patentans0gning nr. 7805483-0 er det 25 kendt at forbedre hârdheden og andre mekaniske egenskaber ved finér ved, at det udsættes for et pressetryk af st0rrelsesordenen 150-350 Mpa. Denne behandling angives at bevirke en tilnærmelsesvis maksimal komprimering af finéren og f0lgelig at medf0re en betydelige formind-30 skelse af materialetykkelsen.According to Swedish patent application No. 7805483-0, it is known to improve the hardness and other mechanical properties of veneers by being subjected to a compressive pressure of the order of 150-350 Mpa. This treatment is said to cause an approximately maximum compression of the veneer and consequently to a considerable reduction in the thickness of the material.
Nâr træ betragtes ud fra et kemisk, henholdsvis et meka-nisk synspunkt, kan det konstateres, at trævævet kemiskt bestâr af cellulose, hemicellulose, lignin og eventuelt 35 harpiks, terpentiner og garvestoffer, medens træ meka- niskt er en konstruktion, der er sammensat af materialerWhen wood is considered from a chemical or a mechanical point of view, it can be found that the wood woven chemically consists of cellulose, hemicellulose, lignin and possibly 35 resin, turpentine and tanning substances, while wood is a mechanically constructed structure. of materials
DK 156626 BDK 156626 B
2 med vidt forskellige egenskaber. Celluloseskelettet kan i sig selv kun optage trækkræfter, og for at kunne mod-stâ trykkræfter mâ fortrængning af de svagere cellulose-strenge undgâs, hvilket kan ske som f0lge af, at de er 5 indkapslede i lignin. Ligninindholdet i træ har derfor væsentlig betydning for træets trykstyrke. Dette er allerede tidligt pâvist af Trendelenburg i publikationen "Das Holz als Rohstoff", Leipzig-Berlin, 1939, hvori det med diagrammer og talmateriale pâvises, at et stigende 10 ligninindhold i træ bevirker en betydelig forjzigelse af styrkeegenskaberne.2 with widely different properties. The cellulose skeleton itself can only absorb tensile forces, and in order to withstand compressive forces, displacement of the weaker cellulose strands must be avoided, which can occur as a result of being encapsulated in lignin. The lignin content of wood therefore has a significant impact on the wood's compressive strength. This has already been demonstrated early by Trendelenburg in the publication "Das Holz als Rohstoff", Leipzig-Berlin, 1939, in which it is shown with diagrams and figures that an increasing 10 lignin content in wood causes a considerable change in the strength properties.
Det er opfindelsens formai at anvise en fremgangsmâde, hvorved der tilvejebringes forstærkning af cellevæggene 15 ved hjælp af træets egen lignin, og opfindelsen bygger herved pâ det faktum, at ligninet begynder at bl0dg0res ved ca. +75 °C-100 °C, medens cellulosen i hovedsagen forbliver intakt ved temperaturer mellem +100 °C og + 250 °C. Ved temperaturer pâ op til +75 °C er ligninet 20 meget hârdt og forholdsvis por0st, medens cellulosen er fleksibel. Formâlet opnâs if0lge opfindelsen ved, at fi-néren opvarmes til en temperatur pâ 75-160 °C, fortrins-vis 120-150 °C til bl0dg0relse af dens ligninkomponent og komprimeres i tilslutning til opvarmningen ved pres-25 ning med et pressetryk pâ 5-100 MPa, fortrinsvis 5-30 MPa.It is the object of the invention to provide a method by which the cell walls 15 are reinforced by the wood's own lignin, and the invention is thereby based on the fact that the lignin begins to soften at about 30 ° C. +75 ° C-100 ° C, while the cellulose generally remains intact at temperatures between +100 ° C and + 250 ° C. At temperatures up to +75 ° C, the lignin 20 is very hard and relatively porous while the cellulose is flexible. The object is achieved according to the invention by heating the furnace to a temperature of 75-160 ° C, preferably 120-150 ° C to soften its lignin component and compressed in addition to the heating by pressing with a pressure of 5 -100 MPa, preferably 5-30 MPa.
Opfindelsen udnytter sâledes praktisk træets foran nævn-te egenskaber, hvilket overraskende resulterer i, at nâr 30 man komprimerer finér ved en temperatur mellem +75 °C og + 160' °C med tryk mellem 5 MPa og 20 MPa, kan det kom-primerede volumen reduceres til ca. halvdelen af det op-rindelige volumen, samtidig med at den procentuelle for-0gelse af lignin i de komprimerede dele medf0rer en be-35 tydelig styrkefor0gelse. Desuden bidrager de i vedet indgâende terpentiner og harpikser til at sammenbindeThe invention thus utilizes practically the aforementioned properties of the wood, which surprisingly results in the fact that when 30 veneers are compressed at a temperature between +75 ° C and + 160 ° C with pressures between 5 MPa and 20 MPa, the compressed volume is reduced to approx. half of the original volume, while the percentage increase in lignin in the compressed portions results in a significant increase in strength. In addition, the wood turpentines and resins contained in the wood contribute to bonding
DK 156626 BDK 156626 B
3 træstrukturen og at tilvejebringe et mere hydrofobt pro-dukt, hvorved finéren bliver mere uf0lsom over for fug-tighedsvariationer.3 and to provide a more hydrophobic product, thereby rendering the veneer more insensitive to moisture variations.
5 Opfindelsen forklares nærmere i det f0lgende ved hjælp af et udf0relseseksempel.The invention is explained in more detail below by means of an embodiment.
I tilslutning til finért0rring udtoges ca. 3 mm tykt granfinér fra et kontinuerligt arbejdende finért0rrean-10 læg med driftstemperatur pâ + 150 °C. Med vedligeholdt temperatur pressedes finéren i en valsepresse, ligeledes -4-0 ved en driftstemperatur pâ +150 C. Pressetiden beregne-des til 1 sekund og pressetrykket androg 18 MPa. Efter den beskrevne behandling opnâedes formstabilt finér med 15 betydeligt 0get hârdhed.In connection with veneer drying, approx. 3 mm thick spruce veneer from a continuous working veneer dryer with operating temperature of + 150 ° C. With maintained temperature, the veneer was pressed into a roll press, also -4-0 at an operating temperature of +150 C. The pressing time was calculated to 1 second and the pressing pressure was 18 MPa. After the treatment described, form-stable veneer was obtained with 15 significantly increased hardness.
Finér, der blev nedt0rret til 9% fugtighedsindhold og u-middelbart derefter komprimeredes if0lge opfindelsen, havde efter nedk0ling til rumtempenatur en hârdhed pâ 7 20 kg/mm2, medens finér, som kun nedt0rredes til 9% fugtighedsindhold, efter nedk0ling til rumtemperatur havde en hârdhed pâ 1,5 kg/mm2.Veneers which were reduced to 9% moisture content and immediately compressed according to the invention, after cooling to room temperature had a hardness of 7 20 kg / mm2, while veneer which only reduced to 9% moisture content after cooling to room temperature had a hardness at 1.5 kg / mm2.
25 30 3525 30 35
Claims (2)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE8008814 | 1980-12-16 | ||
| SE8008814A SE446702B (en) | 1980-12-16 | 1980-12-16 | PROCEDURE FOR HARDGORING AND STABILIZING THREE |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| DK555381A DK555381A (en) | 1982-06-17 |
| DK156626B true DK156626B (en) | 1989-09-18 |
| DK156626C DK156626C (en) | 1990-03-12 |
Family
ID=20342473
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DK555381A DK156626C (en) | 1980-12-16 | 1981-12-15 | PROCEDURES FOR HARDENING AND STABILIZING FINES |
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) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE9303821L (en) * | 1993-11-18 | 1995-05-19 | Curt Lindhe | Ways to produce hard wood elements |
| SE510658C2 (en) * | 1995-02-24 | 1999-06-14 | Curt Lindhe | Ways to make impregnated wood products |
| SE510198C2 (en) * | 1995-04-13 | 1999-04-26 | Asea Brown Boveri | Device for pressure treatment of wood |
| SE9502497D0 (en) * | 1995-07-07 | 1995-07-07 | Lennart Castwall | Ways to produce hard wood elements |
| SE510179C2 (en) * | 1995-12-22 | 1999-04-26 | Asea Brown Boveri | Procedure for the treatment of wood |
| 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 |
| EP3732007A4 (en) | 2017-12-29 | 2022-03-09 | Ahf, Llc | DENSIFIED WOOD USING A PREPARATION PROCESS |
Family Cites Families (2)
| 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 |
-
1980
- 1980-12-16 SE SE8008814A patent/SE446702B/en unknown
-
1981
- 1981-12-04 DE DE19813148120 patent/DE3148120A1/en active Granted
- 1981-12-14 NO NO814250A patent/NO154910C/en not_active IP Right Cessation
- 1981-12-15 DK DK555381A patent/DK156626C/en not_active IP Right Cessation
- 1981-12-15 FI FI814020A patent/FI73621C/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| DE3148120A1 (en) | 1982-08-05 |
| SE8008814L (en) | 1982-06-17 |
| FI73621B (en) | 1987-07-31 |
| FI814020L (en) | 1982-06-17 |
| NO814250L (en) | 1982-06-17 |
| NO154910C (en) | 1987-01-14 |
| FI73621C (en) | 1987-11-09 |
| DK156626C (en) | 1990-03-12 |
| DE3148120C2 (en) | 1992-04-09 |
| NO154910B (en) | 1986-10-06 |
| DK555381A (en) | 1982-06-17 |
| SE446702B (en) | 1986-10-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Cabral et al. | Densification of timber: a review on the process, material properties, and application | |
| Shams et al. | Compressive deformation of wood impregnated with low molecular weight phenol formaldehyde (PF) resin I: effects of pressing pressure and pressure holding | |
| US20040115460A1 (en) | Modifield wood product and process for the preparation thereof | |
| DK156626B (en) | PROCEDURES FOR HARDENING AND STABILIZING FINES | |
| GB2107244A (en) | Moulding moulded articles from binder-containing organic fibrous mats | |
| NO174353B (en) | Cellulosic fiber aggregate and its method of preparation | |
| JP3940678B2 (en) | Molded body made of wood and method for producing the molded body | |
| JP6383098B2 (en) | A new type of hardwood manufactured by consolidation technology | |
| EP0197674B1 (en) | Process for densifying low density woods | |
| RU2152966C1 (en) | Molded material, method of its production and method of producing composite material based on molded material | |
| RU2091217C1 (en) | Method for producing thermoplastic wood (versions) | |
| JP3113744B2 (en) | Method for manufacturing consolidated wood | |
| JPH04135701A (en) | Preparation of wood enhanced in dimensional stability | |
| FI110241B (en) | Process for making pressed wood pieces | |
| US2964792A (en) | Synthetic lumber pressure slam | |
| KR20170021385A (en) | A method for compressing wood improving dimensional stability | |
| AU2002242462B2 (en) | Modified wood products and process for the preparation thereof | |
| FI91503C (en) | Process for plasticizing wood in particular for processing thereof | |
| CN112739510A (en) | Process for producing shaped article | |
| JP7116404B2 (en) | Method for producing furan polymer impregnated wood | |
| KR101785554B1 (en) | Drying of lumber and resin impregnation Wood bulk processing method | |
| SU251819A1 (en) | METHOD OF MANUFACTURING OF PRESSED WOOD IN THE FORM OF PREPARATIONS | |
| FI92919B (en) | Method for the manufacture of hard-pressed wood | |
| SU893526A1 (en) | Method of producing compressed wood | |
| WO2001085640A3 (en) | Method of the production of polymeric concrete and said polymeric concrete |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUP | Patent expired |