Process for the marking of carrierless polymeric membranes and a

Details Process for the marking of carrierless polymeric membranes and a Process for the marking of carrierless polymeric membranes and a

1981-10-23

1984-01-17

Tungol, Maria Parrish

Bleaching and dyeing; fluid treatment and chemical modification

Overall dimensional modification or stabilization, e.g.,...

Solvent treatment of synthetic fibers

264 78, 264132, 8518, D06P 700, C04B 4116

Patent

active

044262043

ABSTRACT:
The process for the visible marking of carrierless polymeric membranes for filtration purposes and for the reverse osmosis is characterized in that the marking symbols are first of all printed onto the casting support, onto which subsequently the casting mass is poured which serves for the production of the membrane. During the removing of the pre-solidified, solidified or finished membrane from the casting support, the printing dye which has an outline corresponding to the marking symbols, is taken up by the membrane and is taken along by the latter from the casting support. Preferably, the printing dye which had been imprinted onto the casting support when the membrane casting mass is poured on, has at least dried in a wipe-proof manner and, in this state, is soluble in the solvent-system of the membrane casting mass.

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