Method for sealing the perimeter of a filter sheet
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United States of America Patent
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Jul 10, 2001
Grant Date -
N/A
app pub date -
Sep 7, 2000
filing date -
Oct 6, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for sealing the edges of a filter sheet (10) with wax to create a fluid-impermeable wax seal (11) enclosing a non-sealed portion (12). The method includes applying melted wax to the edges of the filter sheet, heating the treated filter sheet such that the wax permeates through the edges thereof, and then allowing the filter sheet to cool such that the wax congeals. The wax of the fluid-impermeable wax layer (11) has a durometer reading of about 75 to about 100 Shore A hardness at 25.degree. C. and 85.degree. C., a melt point of about 110.degree. C. to about 180.degree. C., a viscosity of less than about 100 cp at 155.degree. C. and preferably includes ethylene bis stearamide. The wax layer increases the useful life of the filter sheet while providing a sheet which is easily released from a filter press and which retains integrity along the seal during repeated hot water sanitations.
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