Paper making and fiber liberation – Processes and products – Multi-layer waterlaid webs or sheets
162129, 162212, 162213, D21F 1104
Multilayer paper of superior layer purity and formation is produced by discharging a plurality of superimposed jets of papermaking stock from a headbox into the throat of a roll former, preventing the discharged jets from coming together for a short distance by introducing air between adjacent jets as they leave the headbox, and maintaining the velocity of the jet closest to a plain forming roll in the roll former slightly higher than the velocity of an adjacent discharged jet.
patent: 4181568 (1980-01-01), Pfaler
patent: 4349414 (1982-09-01), Stenberg
AB Karlstads Mekaniska Werkstad
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