Stripping liquid for use in separating paper from...

B - Operations – Transporting – 09 – B

Patent

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Details

B09B 3/00 (2006.01) B09B 5/00 (2006.01) C09K 13/00 (2006.01) D21C 5/02 (2006.01)

Patent

CA 2641903

A stripping liquid which is for use in stripping the paper from a plaster/paper laminate such as a waste plasterboard and comprises an aqueous solution of an alkali metal or ammonium carboxylate. This stripping liquid is supplied to a surface (paper surface) of the plaster/paper laminate to infiltrate it into the bonding interface between the plaster and the paper. The carboxylate is thus caused to be present at the bonding interface. The paper is stripped off in the presence of this carboxylate, whereby the paper can be entirely separated from the plaster. Furthermore, by incorporating a nonionic surfactant or a water-soluble organic solvent into the stripping liquid, the stripping liquid can be rapidly infiltrated without fail into the bonding interface between the plaster and the paper.

Liquide de décollage lequel est destiné à être utilisé pour décoller le papier d'un stratifié de plâtre/papier tel qu'une ancienne plaque de plâtre et comprend une solution aqueuse d'un carboxylate de métal alcalin ou d'ammonium. On applique ce liquide de décollage sur une surface (surface de papier) du stratifié de plâtre/papier pour l'infiltrer dans l'interface de collage entre le plâtre et le papier. On fait ainsi en sorte que le carboxylate soit présent au niveau de l'interface de collage. On décolle le papier en présence de ce carboxylate, ce par quoi on peut entièrement séparer le papier du plâtre. En outre, en incorporant un tensioactif non ionique ou un solvant organique soluble dans l'eau dans le liquide de décollage, le liquide de décollage peut s'infiltrer rapidement et sans faute dans l'interface de collage entre le plâtre et le papier.

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