Process for the continuous manufacture in an aqueous environment of fibrous webs containing latex or a similar composition and/or a phenoplastic or aminoplastic, webs so obtained and their optional 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. The new sheets obtained by this process find use in the field of paper manufacture.