Production of hardboard in a closed water system

Details Production of hardboard in a closed water system Production of hardboard in a closed water system

1975-08-11

1977-02-22

Lindsay, Jr., Robert L.

Paper making and fiber liberation

Processes and products

Multi-layer waterlaid webs or sheets

162135, 162163, 162190, 162206, 162225, D21F 1104, D21F 1300

Patent

active

040090736

ABSTRACT:
Hardboard is produced by a process wherein wood solubles or sugars released principally during the pulp preparation stage are retained in a closed water system by collecting the process waters released during mechanical dewatering of the pulp to form a mat and returning such water to the system. The mat is dried by thermal evaporation with substantial quantities of sugars being deposited on the mat surfaces as a result. The mat is then pressed under conditions such as to cause flowing and caramelization of the surface sugars thus forming a crust or skin of the sugars on the mat surfaces, which sugars improve the board surface characteristics. A paper overlay may be applied to the mat prior to pressing and bonded thereto by the sugars to provide a paper overlaid hardboard.

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patent: 2208511 (1940-07-01), Ellis
patent: 2495043 (1950-01-01), Willey et al.
patent: 2802403 (1957-08-01), Boehm
patent: 2888376 (1959-05-01), Stewart
patent: 2898260 (1959-08-01), Berliner
patent: 2918398 (1959-12-01), Dorland et al.
patent: 3113065 (1963-12-01), Newton et al.
patent: 3159528 (1964-12-01), Goss
patent: 3223579 (1965-12-01), Dorland et al.
patent: 3303089 (1967-02-01), Roubicek et al.
patent: 3485714 (1969-12-01), White
patent: 3907630 (1975-09-01), Selander

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