Chemistry: molecular biology and microbiology – Micro-organism – tissue cell culture or enzyme using process... – Preparing compound containing saccharide radical
Patent
1996-12-03
1998-12-08
Prats, Francisco C.
Chemistry: molecular biology and microbiology
Micro-organism, tissue cell culture or enzyme using process...
Preparing compound containing saccharide radical
435 72, 435133, 435156, 1061625, 536123, 5361231, 536126, C12P 1904, C08L 102, C08B 1510
Patent
active
058467882
DESCRIPTION:
BRIEF SUMMARY
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a 35 U.S.C. 371 national application of PCT/DK95/00318 filed 26 Jul. 1995, which is incorporated herein by reference.
FIELD OF THE INVENTION
The present invention provides a process for producing a medium-density fibre board ("MDF")!, particle board, plywood, paper or paperboard (such as cardboard and linerboard), from an appropriate lignocellulosic starting material, such as vegetable fibre, wood chips, wood flakes, etc. The use of the process of the invention confers excellent tensile, tear and compression strength on lignocellulose-based products prepared thereby, especially paper products such as liner board, cardboard and corrugated board.
BACKGROUND AND BRIEF DESCRIPTION OF THE INVENTION
Lignocellulose-based products prepared from lignocellulosic starting materials, notably products manufactured starting from vegetable fibre (e.g. wood fibre) prepared by mechanical or mechanical/chemical procedures (the latter often being denoted "semi-chemical" procedures), or by a chemical procedure without bleaching, or from wood particles (wood "chips", flakes and the like), are indispensable everyday materials. Some of the most familiar types of such products include paper for writing or printing, cardboard, corrugated cardboard, fibre board (e.g. "hardboard"), and particle board.
Virtually all grades of paper, cardboard and the like are produced from aqueous pulp slurry. Typically, the pulp is suspended in water, mixed with various additives and then passed to equipment in which the paper, cardboard etc. is formed, pressed and dried. Irrespective of whether mechanically produced pulp (hereafter denoted "mechanical pulp"), semi-chemically produced pulp (hereafter denoted "semi-chemical pulp"), unbleached chemical pulp or pulp made from recycled fibres (i.e. pulp prepared from recycled paper, rags and the like) is employed, it is often necessary to add various strengthening agents to the pulp in order to obtain an end product having adequate strength properties. In the case of paper and board for use in packaging and the like, the tensile strength and tear strength under dry and wet conditions are of primary importance; moreover, notably in the case of certain grades of cardboard (e.g. so-called unbleached board for the manufacture of corrugated cardboard boxes for packaging, transport and the like), the compression strength of the material is often also an important factor. Among the strengthening agents used today there are a number of environmentally undesirable substances which it would be desirable to replace by more environmentally acceptable materials. As examples hereof may be mentioned epichlorohydrin, urea-formaldehyde and melamine-formaldehyde.
In the case of "traditional" lignocellulose-based composites for use in building construction, flooring, cladding, furniture, packaging and the like, such as hardboard (which is normally made from wood fibres produced by mechanical or semi-chemical means or by so-called "steam explosion") and particle board (which is made from relatively coarse wood particles, fragments or "chips"), binding of the wood fibres or particles to give a coherent mass exhibiting satisfactory strength properties can be achieved using a process in which the fibres/particles are treated--optionally in a mixture with one or more "extenders", such as lignosulfonates and/or kraft lignin--with synthetic adhesives (typically adhesives of the urea-formaldehyde, phenol-formaldehyde or isocyanate type) and then pressed into the desired form (boards, sheets, panels etc.) with the application of heat.
The use of synthetic adhesives of the above-mentioned types in the production of wood products is, however, generally undesirable from an environmental and/or safety point of view, since many such adhesives are directly toxic--and therefore require special handling precautions--and/or can at a later stage give rise to release of toxic and/or environmentally harmful substances; thus, for example, the release of formaldehyde from certai
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Philippou, John L., "Applicability of Oxidative Systems To Initiate Graphing On And Bonding Of Wood". Journal of Wood Chemistry And Technology, 1(2), 199-227 (1981), pp. 199-221.
Haars et al., "Room-Temperature Curing Adhesives Based on Lignin and Phenoloxidases" (Chapter 10), American Chemical Society, pp. 126-134.
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Felby Claus
Pedersen Lars Saaby
Gregg Valeta
Novo Nordisk A S
Prats Francisco C.
Zelson Steve T.
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