Optimized wax for sealing the edge of a filter sheet
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United States of America Patent
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-
Oct 17, 2000
Grant Date -
N/A
app pub date -
Sep 29, 1998
filing date -
Oct 6, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A filter sheet positioned between plates (14) of a filter press has a fluid-impermeable wax layer (11) sealing the sheet's perimeter. The wax preferably comprises ethylene bis stearamide and 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., and a viscosity of less than about 100 cp at 155.degree. C. 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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