A simplified method for the optical brightening of paper either in the pulp mass, the size or metering press or by coating by the use of a formulation of an optical brightening agent together with a swellable layered silicate.

Um método simplificado para brightening ótico do papel na massa da polpa, no tamanho ou na imprensa metering ou revestindo pelo uso de um formulation de um agente brightening ótico junto com um silicato mergulhado swellable.

 
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> Process for the removal of water from evacuated chambers or from gases

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