Method of reducing surface irregularities in paper machine headb

Details Method of reducing surface irregularities in paper machine headb Method of reducing surface irregularities in paper machine headb

1994-06-17

1996-10-22

Czaja, Donald E.

Paper making and fiber liberation

Processes and products

Conditioning, preparing or repairing of apparatus

162198, 162272, D21F 132

Patent

active

055672736

ABSTRACT:
A method of reducing surface irregularities in paper machine headbox components such as the apron floor. A lap having a working surface diameter greater than the dominant dimensional characteristic of the irregularities is provided. The lap's working surface is machined flat to a tolerance equivalent to a desired flatness tolerance of the apron floor. A central, circular portion of the lap's working surface is counterbored to define an outer, annular cutting region on the lap's working surface. The apron floor is levelly supported and measured to obtain an initial profile of surface irregularity as a function of position on the apron floor. The lap is then driven to rotate its cutting region levelly on and over the apron floor while abrasive material in solid form and a coolant are applied between the lap and the apron floor. The apron floor is again measured to obtain an updated profile of surface irregularity as a function of position on the apron floor. The lapping and measuring steps are repeated with progressively finer grades of abrasive material until comparison of the initial and updated profiles reveals attainment of the desired flatness tolerance of the apron floor. The procedure can be repeated at corner regions of the apron floor by substituting for the lap a corner lap having a working surface diameter significantly less than the apron floor width.

REFERENCES:
patent: Re28269 (1974-12-01), Hill et al.
patent: 1898372 (1933-02-01), Hyde
patent: 4551204 (1985-11-01), Holik et al.
patent: 4897158 (1990-01-01), Weisshuhn et al.
"The Challenge, Lapping a Headbox Apron Floor" by D. H. Offerhaus; presented in Canada on 24 Apr., 1993; published in the proceedings of the 1993 Spring Conference, Canadian Pulp & Paper Association, Technical Section, Pacific Coast & Western Branches, Whistler, British Columbia, Canada, May 26-30, 1993.
"Continuing the Challenge, `Blueprinting` a Headbox" by D. H. Offerhaus; presented in Canada on 23 Apr., 1994; published in the proceedings of the 1994 Spring Conference, Canadian Pulp & Paper Association, Technical Section, Pacific Coast & Western Branches, Jasper, Alberta, Canada, May 19-21, 1994.

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