Paper making and fiber liberation – Processes and products – Conditioning – preparing or repairing of apparatus
Patent
1990-01-26
1991-06-04
Hastings, Karen M.
Paper making and fiber liberation
Processes and products
Conditioning, preparing or repairing of apparatus
1525651, 162272, 162281, D21G 300
Patent
active
050211242
ABSTRACT:
The invention concerns a double doctor (10) for a paper machine, comprising the first doctor blade (12) and a second doctor blade (14), which are fitted to scrape the same roll face (T.sub.1). The double doctor (10) includes a first doctor beam (11) and therein a first doctor blade (12) as well as a second doctor beam (13) and therein a second doctor blade (14). The first doctor beam (11) and the second doctor beam (13) are interconnected at their ends by means of end plates (15a, 15b), whereby an opening (C) remains between the doctor beams (11, 13) and the end plates (15a, 15b), through which opening (C) the material or paper web scraped off the roll face (T.sub.1) can be passed freely into a pulper. The invention also concerns a method for adjustment of the double doctor.
REFERENCES:
patent: 2203273 (1937-11-01), Williams
patent: 3194156 (1963-07-01), Picking
patent: 4192231 (1980-03-01), Kawakami
patent: 4516849 (1985-05-01), Tsutsui et al.
patent: 4821672 (1989-04-01), Bruno
patent: 4919756 (1990-04-01), Sawdai
Kahonen Antti
Turtinen Pekka
Hastings Karen M.
Valmet Paper Machinery Inc.
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