Apparatus for adjusting the creping conditions

Details Apparatus for adjusting the creping conditions Apparatus for adjusting the creping conditions

D - Textiles, Paper

21

G

D21G 3/04 (2006.01) D21G 3/00 (2006.01)

Patent

CA 2115652

A creping doctor apparatus includes a creping doctor (4) hav- ing 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), con- trols 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 calip- er 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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