Continuous papermaking process

Details Continuous papermaking process Continuous papermaking process

D - Textiles, Paper

21

F

92/7

D21F 1/66 (2006.01) D21F 11/00 (2006.01)

Patent

CA 1056633

ABSTRACT OF THE DISCLOSURE A continuous, essentially closed recirculating papermaking process is provided by using a dispersing me- dium of adjustable viscosity. The process permits the continuous reuse of the medium under preferred operating conditions. It includes the steps of forming a dispersion of fibers within the adjustable medium containing a pH sensitive viscosity producing agent, reducing the fiber consistency and the viscosity within the dispersion while maintaining the concentration of the agent substantially unchanged, subsequently forming a fibrous web material on a papermaking screen from said dispersion of reduced fiber consistency while separating the dispersing media from the fibers forming the web and continuously collecting the sep- arated media and recirculating it within the system to ef- fect a subsequent fiber dispersion as well as a fiber con- sistency reduction and viscosity reduction without substan- tially changing the concentration of the viscosity producing agent. The separated and recirculated dispersing media is capable of forming a high viscosity dispersing media for the fibers at the time of forming the subsequent fiber disper- sion without the addition of more viscosity producing agent.

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