Pulp refining

Rosin sizing usually involves the addition of dilute aqueous solutions or dispersions of rosin soap size and alum to a pulp slurry (44—46). Although beater addition of either coreactant is permissable, addition of both before final pulp refining is unwise because subsequently exposed ceUulose surfaces may not be properly sized. The size and alum should be added sufficiendy eady to provide uniform distribution in the slurry, and adequate time for the formation and retention of aluminum resinates, commonly referred to as size precipitate. Free rosin emulsion sizes, however, do not react to a significant degree with alum in the pulp slurry, and addition of a cationic starch or resin is recommended to maximize retention of size to fiber. Subsequent reaction with aluminum occurs principally in the machine drier sections (47). 

Semichemical Combination of impure fibers Intermediate pulp refiner mechanical pulp High-yield kraft, high- 6... 

Figure 5.8 2H NMR quadrupole splittings for D20 adsorbed on to never dried bleached Kraft softwood pulp refined to different degrees (25000 and 500 revolutions in a PFI mill).

In past practice, native (unmodified) starch was added to the papermaking furnish in order to increase internal and surface strength of the product. The presence of starch in the papermaking furnish allows lower levels of pulp refining for... 

Kerr AJ andUprichard JM (1976) The kinetics of kraft pulping refinement of a mathematical moAs. APPITA, 50(1)48-54... 

Debottlenecking and Retrofitting of Chemical Pulp Refining Process for Paper Manufacturing - Application from Industrial Perspective... 

Is the overall freeness drop sufficient for the type of pulp refined ... 

Kerekes, R.J. (1990) Characterization of pulp refiners by a C-factor. Nordic Pulp and Paper Research Journal, 5(1), 3-8. 

---