Method for recycling wash-water resulting from film treatment
First Claim
1. A method of recycling wash-water resulting from the treatment of a film provided with a carbon particles based backing layer, said treatment comprising a washing treatment to remove said carbon particles based backing layer, wherein said method comprises the step of passing said wash-water through an ultrafiltration unit equipped with a hydrophilic ultrafiltration membrane whose surface is electrically charged, wherein a permeate is obtained, and wash-water free of at least said carbon particles is obtained in said permeate.
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Abstract
The invention relates to a method of recycling wash-water resulting from the treatment of a film provided with a carbon particles based backing layer, and especially from a washing treatment to remove the said carbon particles based backing layer. The method comprises the step of passing the wash-water through an ultrafiltration unit equipped with an electrically charged hydrophilic ultrafiltration membrane, e.g. an acrylonitrile copolymers based membrane. The method enables the recycling of the wash-water made uncolored with a high efficiency and considerable lowering of the water consumption used in this step of the processing.
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Citations
10 Claims
- 1. A method of recycling wash-water resulting from the treatment of a film provided with a carbon particles based backing layer, said treatment comprising a washing treatment to remove said carbon particles based backing layer, wherein said method comprises the step of passing said wash-water through an ultrafiltration unit equipped with a hydrophilic ultrafiltration membrane whose surface is electrically charged, wherein a permeate is obtained, and wash-water free of at least said carbon particles is obtained in said permeate.
Specification