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US 6,206,308 B1Granted
Method to obtain wood with weak fibre connections
OwnerJoachim W. O. Seltmaninventor
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Abstract
A method and an arrangement for obtaining wood in which the tracheids have less ability to bind to each other. The end surface of the wood is irradiated with pulsed laser light of such strength, and with such a number of pulses, that lignin-related cellulose and hemicellulose bonds break up along the light-conducting middle lamella to a depth which is sufficient to ensure that reduction of the wood (to paper pulp) via mechanical processes can be done more quickly, more gently and with greater efficiency.
Claims9
A method for separating fibers from a section of wood, the method comprising the steps of:
- cutting wood into sections of a predetermined size;
- irradiating the sections of wood with light of such light density that bonds break along middle lamellas in the irradiated wood to a depth in the sections of wood reached by the light, so that the bonds between fibers of the wood are loosened;
- separating the fibers mechanically from the sections of wood to the depth which the light has reached;
- and
- alternating irradiation with light and mechanical separation until the fibers are separated from the sections of wood.
2 more elements
Dependencies are inferred from the claim text.