| 摘要 |
Filler material is prepd. as follows: (a) the H2O-content of a plant fibre (I) slurry is adjusted until the slurry is shredable; (b) the fibre size of the slurry is reduced; (c) the physical props. of the slurry are adjusted to predetermined standards; (d) the slurry is agglomerated by growth agitation procedures into granules which mimic the appearance of naturally occurring clay; and (e) the granules are dried to H2O-content not more than 10%. Step (a). Prefd. (I) include tree fibres, citrus pulp, sugar cane or beets, grain, potatoes, or esp. de-inked paper sludge (40-80% fibres by wt.), or prim. process paper sludge (75-99% fibres by wt.). H2O adjustment is pref. by drying at 150 deg.F in a tray drier. Step (b). Slurry is pref. shredded to fibre size 1-10 mm. Step (c). Pref. the slurry is treated with a dye, a biocide, a fragrance, and a filler (kaolin, TiO2 or barytes) to increase the density. Step (d). Agglomeration is e.g. in a pinmill or in a roller with added H2O. Spherical granules are pref. flattened before step (e). Prefd. filler granules have size 6-60 esp. 8-20 mesh.
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