Paper making and fiber liberation – Apparatus – Web creping or crinkling type
Patent
1990-02-28
1991-04-30
Hastings, Karen M.
Paper making and fiber liberation
Apparatus
Web creping or crinkling type
162272, 162363, 1525651, 34120, D21G 304
Patent
active
050115740
ABSTRACT:
A creping doctor (2) for creping a soft paper web (3) off a yankee cylinder (1) is described which comprises a supporting beam (4) disposed close to the envelope surface of the yankee cylinder (1) and provided with an internal space, the internal space being divided into a first longitudinal suction chamber (24) and a second longitudinal suction chamber (25). The creping doctor also produces a subatmospheric pressure in the suction chambers (24, 25); a first suction connection (18, 19, 21) connecting the first suction chamber (24) of the supporting beam (4) to an external dust-generating space (7) located between the doctor blade (6) and the soft paper web (3) creped off; and a second suction connection (40, 42, 43) connecting the second suction chamber (25) of the supporting beam (4) with an internal dust-generating space (8) located between the doctor blade (6) and the envelope surface of the yankee cylinder (1). According to the invention the creping doctor is provided with blowing means (50, 51, 58) for intermittent cleaning of the suction connections (18, 19, 21; 40, 42, 43) and suction chambers (24, 25) from dust deposited therein during operation.
REFERENCES:
patent: 3003176 (1961-10-01), Goyette
patent: 4019953 (1977-04-01), Nystrom
patent: 4906333 (1990-03-01), Myren
Gustavsson Tord G.
Myren Harry I.
Silja Karl T. I.
Hastings Karen M.
Valmet Paper Machinery Inc.
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