GB644503A - Hardboard and the method of making it - Google Patents

Hardboard and the method of making it

Info

Publication number
GB644503A
GB644503A GB5513/48A GB551348A GB644503A GB 644503 A GB644503 A GB 644503A GB 5513/48 A GB5513/48 A GB 5513/48A GB 551348 A GB551348 A GB 551348A GB 644503 A GB644503 A GB 644503A
Authority
GB
United Kingdom
Prior art keywords
pressure
acid
temperature
wood
dilute
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
GB5513/48A
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 GB644503A publication Critical patent/GB644503A/en
Expired legal-status Critical Current

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

Boards are made by acting on finely-divided ligno-cellulose material such as wood with 1/2 -4 per cent of acid in dilute aqueous solution, drying, and subjecting the mass to pressure at elevated temperature. Wood shavings, chips, &c. reduced if necessary in a hammer mill or other apparatus are sprayed and thoroughly mixed with about twice the weight of dilute acid, e.g. sulphuric acid, and are then heated to drive off all free moisture. The material is then placed on a supporting-surface or in a mould and subjected to a preliminary pressure at normal temperatures, and subsequently to the required temperature and pressure to produce a hard material without blistering. The temperature may be 250-400 DEG F., pressure 300 lbs. per square inch, and duration 7-10 minutes.
GB5513/48A 1947-07-10 1948-02-24 Hardboard and the method of making it Expired GB644503A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US644503XA 1947-07-10 1947-07-10

Publications (1)

Publication Number Publication Date
GB644503A true GB644503A (en) 1950-10-11

Family

ID=22056063

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5513/48A Expired GB644503A (en) 1947-07-10 1948-02-24 Hardboard and the method of making it

Country Status (1)

Country Link
GB (1) GB644503A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2132622A (en) * 1982-11-26 1984-07-11 Faesite Spa Articles made of bonded, heated and pressed wood fibres

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2132622A (en) * 1982-11-26 1984-07-11 Faesite Spa Articles made of bonded, heated and pressed wood fibres

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