Paper making and fiber liberation – Apparatus – Running or indefinite length product forming and/or treating...
Reexamination Certificate
1999-06-17
2001-03-06
Hastings, Karen M. (Department: 1731)
Paper making and fiber liberation
Apparatus
Running or indefinite length product forming and/or treating...
C162S347000
Reexamination Certificate
active
06197161
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to paper-making machines, and, more particularly to a profile bar assembly used in a headbox of a paper-making machine.
2. Description of the Related Art
A paper-making machine is used to make a fiber web, such as a paper web. A headbox at the wet end of the paper-making machine receives a fiber suspension and discharges the fiber suspension with a controlled cross-sectional profile onto a wire in a forming section adjacent to the discharge outlet of the headbox. The headbox typically includes a nozzle plate which together with the bottom apron defines a discharge nozzle terminating at the discharge outlet.
A headbox as described above typically includes a relatively complex profile bar assembly having many pieces, moving parts, seals, etc. A slice lip with a single working edge extending across the width of the discharge outlet is slidably disposed within corresponding clamping structures in the profile bar assembly. Adjustment spindles spaced across the width of the slice lip typically engage the back of the slice lip opposite the single working edge. Although such a profile bar assembly provides adequate and effective profiling and sealing at the discharge outlet, it can be relatively expensive. An example of such a profile bar assembly is manufactured and sold by the assignee of the present invention under the name “CONSTALIP-C”.
What is needed in the art is a profile bar assembly which is simple and inexpensive, provides retrofit capabilities to existing headboxes, and reduces replacement costs.
SUMMARY OF THE INVENTION
The present invention provides a headbox for a paper-making machine, including a profile bar assembly with a profile bar which is rigidly attached to a nozzle blade and includes a plurality of vertical cuts providing local adjustment. A slice lip is rigidly attached to the nozzle blade and/or profile bar in one of two positions such that a selected edge defines a discharge outlet.
The invention comprises, in one form thereof, a headbox for a paper-making machine including a plurality of side walls and an apron. A nozzle blade is connected to one of the side walls. The nozzle blade and the apron define a discharge nozzle therebetween. A profile bar is rigidly connected to an end of the nozzle blade. A slice lip is rigidly and removably attached to the profile bar and/or nozzle blade. The slice lip and the apron define a discharge outlet therebetween.
An advantage of the present invention is that the profile bar and slice lip are provided as separate but removably attachable pieces, thereby allowing local flexing and adjustment of the profile bar while preventing deleterious effects on the slice lip.
Another advantage is that the slice lip includes two working edges, with the slice lip being attached in one of two different positions so that a selected working edge defines the discharge outlet with the apron.
REFERENCES:
patent: 3902961 (1975-09-01), Roerig et al.
patent: 4373993 (1983-02-01), Fujiwara
patent: 4517055 (1985-05-01), Dove
patent: 4731163 (1988-03-01), Ilmoniemi
patent: 4783241 (1988-11-01), Egelhof
patent: 899586 (1962-06-01), None
patent: 1197000 (1970-07-01), None
Eng James A.
Graf Edwin X.
Haltinner Dale A.
Stilen Frank
Hastings Karen M.
Taylor & Aust P.C.
Voith Sulzer Paper Technology North America Inc.
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