A process for the continuous production in aqueous environment of latex or analog compositions and / or phenolic plastics or amino resins containing fibrous webs, and the resultant webs and their possible reuse.

摘要

A new process for manufacturing sheets made of fibrous material containing latex is characterized in that the pulp containing the fibrous material is prepared in the following way:--adjustment of the pH between 4 and 5.5 and preferably between 4 and 4.5,--addition of an electrolyte, the polarity of which is of the opposite sign to that of the latex used,-- addition of a foam inhibitor,--re-adjustment of the pH between 4 and 5.5, if necessary,--addition, preferably by injection, of latex,--second addition of an electrolyte having the same characteristics as indicated above,--possibly addition of resins (phenoplasts or aminoplasts),--re- adjustment of the pH to the previously indicated value, if necessary. PPThe new sheets obtained by this process find use in the field of paper manufacture.