GB811533A - Improvements in a process for producing high density hardboard - Google Patents

Improvements in a process for producing high density hardboard

Info

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
Application number
GB37644/56A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB811533A publication Critical patent/GB811533A/en
Expired legal-status Critical Current

Links

Classifications

    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21JFIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
    • D21J1/00Fibreboard

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.
GB37644/56A 1955-12-23 1956-12-10 Improvements in a process for producing high density hardboard Expired GB811533A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (9)

* Cited by examiner, † Cited by third party
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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