Paper making and fiber liberation – Processes and products – Conditioning – preparing or repairing of apparatus
Reexamination Certificate
1999-12-03
2001-06-19
Silverman, Stanley S. (Department: 1731)
Paper making and fiber liberation
Processes and products
Conditioning, preparing or repairing of apparatus
C162S198000, C162S263000, C162S272000, C162S275000
Reexamination Certificate
active
06248213
ABSTRACT:
BACKGROUND OF THE INVENTION
In prior art, procedures are known in which the fabrics used in a paper machine or equivalent, such as wires and/or felts, are washed with various chemicals to extend their service life. The washing is performed either continuously while the machine is running or periodically e.g. during down time.
An essential factor in the washing of the fabrics is the accuracy of dosage of chemicals. If an overdose of chemicals is used, this may have adverse effects on the quality of the paper being produced and/or to the runnability of the paper machine. In addition, the operating costs are increased because the chemicals are relatively expensive. On the other hand, if too small amounts of chemicals are used, the washing result will be impaired.
SUMMARY OF INVENTION
The object of the present invention is to achieve a new type of procedure for the washing of fabrics used in a paper machine or equivalent, designed to avoid the drawbacks of prior-art techniques.
The invention provides numerous significant advantages. The procedure allows accurate optimisation of the amount of the washing chemical being used. The procedure also makes it possible to maximise the service life of the fabric. The fabric retains the desired constitution throughout its useful life, allowing a good runnability of the paper machine to be maintained. By using the arrangement of the invention, the amount of washing chemical need not necessarily be measured at all, but the dosage can be effected based solely on measurements of the liquid removed. The arrangement of the invention makes it possible to the optimise the chemicals costs.
Further scope of the applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
REFERENCES:
patent: 3459633 (1969-08-01), West
patent: 3859163 (1975-01-01), Haythornthwaite
patent: 4447924 (1984-05-01), Bolton et al.
patent: 5135615 (1992-08-01), Rokman
patent: 5651812 (1997-07-01), McDermott et al.
patent: 2061341 (1980-08-01), None
patent: 96 12064 (1996-04-01), None
Birch & Stewart Kolasch & Birch, LLP
Ecopump OY
Hug Eric
Silverman Stanley S.
LandOfFree
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