Process for removing waterborne flexographic inks from...

D - Textiles – Paper – 21 – C

Patent

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D21C 5/02 (2006.01)

Patent

CA 2286297

A process for removing waterborne flexographic inks from paper stock comprising the steps of: (a) forming a slurry by pulping paper containing waterborne flexographic inks in an aqueous medium having a pH of greater than 6 which includes: (1) one or more pH adjusting agents; (2) one or more nonionic surfactants; and (3) one or more anionic polyelectrolytes; and (b) subjecting the slurry produced in step (a) to a flotation cell including one or more cationic polymers is provided. The flotation cell can include one or more sources of calcium (2+) ions, magnesium (2+) ions, aluminum (2+) ions or aluminum (3+) ions. Examples of sources of materials which may be selected include the following materials: calcium chloride, aluminum chloride, magnesium chloride, calcium sulfate, magnesium sulfate or aluminum sulfate. In practice, when present, the source of positive ions is present in the flotation cell in amounts ranging from about 10 to about 1000 ppm, more preferably between about 300 and about 500 ppm.

Cette invention se rapporte à un procédé permettant d'éliminer les encres flexographiques à base aqueuse imprimées sur du papier, ce procédé consistant: (a) à former une boue en réduisant en pâte le papier contenant ces encres flexographiques à base aqueuse, dans un milieu aqueux ayant un pH supérieur à 6 et contenant: (1) un ou plusieurs agents de réglage de pH; (2) un ou plusieurs tensioactifs non ioniques; et (3) un ou plusieurs polyélectrolytes anioniques; et (b) à soumettre la boue produite à l'étape (a) à une cellule de flottation contenant un ou plusieurs polymères cationiques. La cellule de flottation peut renfermer une ou plusieurs sources d'ions calcium (2+), d'ions magnésium (2+), d'ions aluminium (2+) ou d'ions aluminium (3+). Les sources de composés qui peut être choisies sont notamment les composés suivants: chlorure de calcium, chlorure d'aluminium, chlorure de magnésium, sulfate de calcium, sulfate de magnésium ou sulfate d'aluminium. En pratique, le cas échéant, la source d'ions positifs est présente dans la cellule de flottation selon des quantités comprises entre environ 10 et 1000 ppm, de préférence entre environ 300 ppm et 500 ppm.

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