GB811533A - Improvements in a process for producing high density hardboard - Google Patents
Improvements in a process for producing high density hardboardInfo
- Publication number
- GB811533A GB811533A GB37644/56A GB3764456A GB811533A GB 811533 A GB811533 A GB 811533A GB 37644/56 A GB37644/56 A GB 37644/56A GB 3764456 A GB3764456 A GB 3764456A GB 811533 A GB811533 A GB 811533A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mat
- lignocellulose
- pressure
- hardboard
- wood particles
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
- D21J1/00—Fibreboard
Landscapes
- Dry Formation Of Fiberboard And The Like (AREA)
Abstract
A high density hardboard is produced by forming a compact mat of lignocellulose particles having a moisture content of 2 to 25 per cent by weight of the dry lignocellulose, passing the mat at room temperature between pressure rolls at a nip pressure of 1,000 to 5,000 pounds per inch so that its density is at least as high as the desired final density of the hardboard, and curing the sheet at a much lower pressure and at an elevated temperature. The lignocellulose may consist of wood particles obtained by steaming chips of pine, hemlock, cedar, or Douglas fir, beech, birch, maple or other wood, milling the steamed chips in a double disc mill, and partially drying the product in a current of air. To the wood particles may be added a phenol-formaldehyde or urea-formaldehyde resin as binder and a molten hydrocarbon wax, rosin, rosin size, or bitumen, as a waterproofing agent. A mat may be formed by depositing a layer or superposed layers on a moving screen or belt, or the wood particles may be blown on to a screen having a partially evacuated air space therebeneath. The mat is preferably passed between the pressure rolls at a speed of at least 25 feet per minute. The dense sheet thus obtained may be cut into lengths and compressed in a flat bed press at a pressure of 25 to 300 pounds per square inch and at a temperature of from 150 DEG to 250 DEG C. The lignocellulose used may alternatively consist of paper, bagasse, straw, or like plant materials. The hardboard may be formed as a face veneer on plywood. For example the dense sheet formed by compressing a mat of wood particles and a thermosetting binder between rolls at 1,000 to 5,000 pounds per inch is connected by a phenol-formaldehyde adhesive to one of the plies of a sheet of plywood. The laminate is then compressed at a lower pressure and at an elevated temperature to set the binder and adhesive.ALSO:A high density hardboard is produced by forming a compact mat of lignocellulose particles having a moisture content of 2 to 25 per cent by weight of the dry lignocellulose, passing the mat at room temperature between pressure rolls at a nip pressure of 1,000 to 5,000 pounds per inch so that its density is at least as high as the desired final density of the hardboard, and curing the sheet at a much lower pressure and at an elevated temperature. The lignocellulose may consist of wood particles obtained by steaming chips of pine, hemlock, cedar, or Douglas fir, beech, birch, maple or other wood, milling the steamed chips in a double disc mill, and partially drying the product in a current of air. To the wood particles may be added a phenol-formaldehyde or urea-formaldehyde resin as binder and a molten hydrocarbon wax, rosin, rosin size, or bitumen, as a waterproofing agent. A mat may be formed by depositing a layer or superposed layers on a moving screen or belt, or the wood particles may be blown on to a screen having a partially evacuated air space therebeneath. The mat is preferably passed between the pressure rolls at a speed of at least 25 feet per minute. The dense sheet thus obtained may be cut into lengths and compressed in a flat bed press at a pressure of 25 to 300 pounds per square inch and at a temperature of from 150 DEG to 250 DEG C. The lignocellulose used may alternatively consist of paper, bagasse, straw, or like plant materials. The hardboard may be formed as a face veneer on plywood. For example the dense sheet formed by compressing a mat of wood particles and a thermosetting binder between rolls at 1,000 to 5,000 pounds per inch is connected by a phenol-formaldehyde adhesive to one of the plies of a sheet of plywood. The laminate is then compressed at a lower pressure and at an elevated temperature to set the binder and adhesive.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US811533XA | 1955-12-23 | 1955-12-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB811533A true GB811533A (en) | 1959-04-08 |
Family
ID=22162420
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB37644/56A Expired GB811533A (en) | 1955-12-23 | 1956-12-10 | Improvements in a process for producing high density hardboard |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB811533A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4597928A (en) * | 1984-03-23 | 1986-07-01 | Leningradsky Tekhnologichesky Institute Tselljulozno-Bumazhnoi Promyshlennosti | Method for fiberboard manufacture |
EP0373726A2 (en) * | 1988-12-16 | 1990-06-20 | Shell Internationale Researchmaatschappij B.V. | Cellulosic fibrous aggregate and a process for its preparation |
EP0373725A2 (en) * | 1988-12-16 | 1990-06-20 | Shell Internationale Researchmaatschappij B.V. | Cellulosic fibrous aggregate and a process for its preparation |
WO1997043485A1 (en) * | 1996-05-09 | 1997-11-20 | Ruehland Lothar | A moulding consisting of straw fibres, paper fibres and a bonding agent and process for the production of said moulding |
WO2017108130A1 (en) * | 2015-12-23 | 2017-06-29 | Goodhout Holding B.V. | Method for the production of artificial wood board |
-
1956
- 1956-12-10 GB GB37644/56A patent/GB811533A/en not_active Expired
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4597928A (en) * | 1984-03-23 | 1986-07-01 | Leningradsky Tekhnologichesky Institute Tselljulozno-Bumazhnoi Promyshlennosti | Method for fiberboard manufacture |
EP0373726A2 (en) * | 1988-12-16 | 1990-06-20 | Shell Internationale Researchmaatschappij B.V. | Cellulosic fibrous aggregate and a process for its preparation |
EP0373725A2 (en) * | 1988-12-16 | 1990-06-20 | Shell Internationale Researchmaatschappij B.V. | Cellulosic fibrous aggregate and a process for its preparation |
EP0373725A3 (en) * | 1988-12-16 | 1991-11-06 | Shell Internationale Researchmaatschappij B.V. | Cellulosic fibrous aggregate and a process for its preparation |
EP0373726A3 (en) * | 1988-12-16 | 1991-11-13 | Shell Internationale Researchmaatschappij B.V. | Cellulosic fibrous aggregate and a process for its preparation |
WO1997043485A1 (en) * | 1996-05-09 | 1997-11-20 | Ruehland Lothar | A moulding consisting of straw fibres, paper fibres and a bonding agent and process for the production of said moulding |
WO2017108130A1 (en) * | 2015-12-23 | 2017-06-29 | Goodhout Holding B.V. | Method for the production of artificial wood board |
CN108698250A (en) * | 2015-12-23 | 2018-10-23 | 古德豪特控股有限公司 | Method for producing artificial board |
US10894338B2 (en) | 2015-12-23 | 2021-01-19 | Goodhout Holding B.V. | Method for the production of artificial wood board |
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