Paper making and fiber liberation – Apparatus – Web creping or crinkling type
Patent
1992-08-27
1995-04-04
Jones, W. Gary
Paper making and fiber liberation
Apparatus
Web creping or crinkling type
1525651, B31F 114
Patent
active
054034469
ABSTRACT:
A creping doctor apparatus includes a creping doctor (4) having a doctor blade (5) with a working edge (6). The creping doctor (4) is pivotable around a rotational axis (12) formed substantially at the working edge (6) to permit adjustment of an impact angle (A) formed at the working edge (6) between an impact surface of the blade edge and the cylindrical surface (2) of a Yankee dryer (3), from which an adhering paper web (1) is to be creped off. The impact angle (A) controls the result of the creping operation, e.g. the caliper and/or the macrostructure of the soft crepe paper web produced, but wear of the working edge (6) gradually causes a change in the impact angle (A) and, thereby, in the creping conditions. To maintain the desired caliper and/or the desired macrostructure as far as possible it is necessary to compensate for the wear of the working edge (6) by pivoting the creping doctor (4) substantially around the working edge (6) so as to maintain the impact angle (A). Circularly arched guide means (20), which have a radius of curvature (R) starting from a desired location of said rotational axis (12) substantially at the working edge (6), are provided for guiding the pivotal movement of the creping doctor (4). The disclosed apparatus is compact, oscillatable and mechanically stable and can readily be substituted for an existing conventional creping doctor.
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Örtemo B. Lennart H.
Trelsmo Karin B.
Jones W. Gary
Lamb Brenda Adele
Valmet-Karlstad AB
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