GB671948A - Improvements in or relating to a process for the production of formed bodies, especially plates, of lignocellulose without the addition of a binding agent - Google Patents

Improvements in or relating to a process for the production of formed bodies, especially plates, of lignocellulose without the addition of a binding agent

Info

Publication number
GB671948A
GB671948A GB13933/49A GB1393349A GB671948A GB 671948 A GB671948 A GB 671948A GB 13933/49 A GB13933/49 A GB 13933/49A GB 1393349 A GB1393349 A GB 1393349A GB 671948 A GB671948 A GB 671948A
Authority
GB
United Kingdom
Prior art keywords
alkali
atmospheres
substance
per cent
defibrated
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
GB13933/49A
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 GB671948A publication Critical patent/GB671948A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L97/00—Compositions of lignin-containing materials
    • C08L97/02—Lignocellulosic material, e.g. wood, straw or bagasse
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08H—DERIVATIVES OF NATURAL MACROMOLECULAR COMPOUNDS
    • C08H8/00—Macromolecular compounds derived from lignocellulosic materials
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
    • C08L95/005—Aqueous compositions, e.g. emulsions

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • Wood Science & Technology (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Paper (AREA)

Abstract

Lignocellulosic material is heated at 172-177 DEG C. and under a pressure of 7.5-8.5 atmospheres for 2-4 hours with a dilute solution of an alkali, or a substance which forms an alkali, or an alkaline substance capable of neutralizing acid, the proportion of alkali or alkaline substance corresponding to 2-4 per cent by weight of the dry woody substance, so that the treated material has a pH value of 5.5-7, and the material is then defibrated, shaped into a plate or other article, and then dried, or pressed and heated. The plates or other articles are obtained without the addition of binding agents, i.e. re-inforcing substances capable of increasing the mechanical strength of the fibre products. If desired, they may be impregnated with waterproofing substances such as paraffin, ceresin, montan wax, or bitumen. Such a substance may be added in an amount not exceeding 2 per cent. The alkali or alkaline substance may be caustic soda, calcium hydroxide, or calcium carbonate. The lignin present in the woody material acts as the binding agent for the defibrated material in the formation of the plates or other articles. The defibrated material may be dehydrated in a long or round screening machine or in a moulding box. The fibre fleece may be hot pressed at 160-170 DEG C. under a pressure below 40 atmospheres to form a hard plate, or it may be simply dried to form an insulating board. In an example, dry pine-wood chips are subjected to vacuum treatment and then boiled for 2 hours under a pressure of 8 atmospheres with 0.3 per cent caustic soda solution. At the end of the treatment the pH of the lye is 6.1. The treated material is defibrated without damaging the fibres and then impregnated with 1 per cent of a bitumen emulsion. After adding alum to bring the pH value to 5, the fibre fleece is dehydrated and then pressed under 25 atmospheres pressure at 160 DEG C. to form a hard plate.
GB13933/49A 1948-06-09 1949-05-25 Improvements in or relating to a process for the production of formed bodies, especially plates, of lignocellulose without the addition of a binding agent Expired GB671948A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT171275T 1948-06-09

Publications (1)

Publication Number Publication Date
GB671948A true GB671948A (en) 1952-05-14

Family

ID=3656187

Family Applications (1)

Application Number Title Priority Date Filing Date
GB13933/49A Expired GB671948A (en) 1948-06-09 1949-05-25 Improvements in or relating to a process for the production of formed bodies, especially plates, of lignocellulose without the addition of a binding agent

Country Status (5)

Country Link
AT (1) AT171275B (en)
BE (1) BE489432A (en)
DE (1) DE838214C (en)
FR (1) FR987816A (en)
GB (1) GB671948A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1033405B (en) * 1953-03-21 1958-07-03 Hoechst Ag Process for the production of molded articles
DE961307C (en) * 1953-08-20 1957-04-04 Rudolf Lawerentz Process for the production of moldings from pre-dried wood chips

Also Published As

Publication number Publication date
DE838214C (en) 1952-05-05
FR987816A (en) 1951-08-20
BE489432A (en) 1949-06-20
AT171275B (en) 1952-05-10

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