Title: Apparatus for the preparation of melt-sprayed spherical phenacetin granules

Abstract: An apparatus for melt-spraying thermally sensitive material of low viscosity comprises a heatable multi-screw extruder having intermeshing, self-cleaning screws of specified clearance between the screws and between the screws and the extruder housing, a heatable pump for delivering molten material from the extruder to a heatable atomizer and a spray tank in which the atomizer is located for cooling and solidifying the melt-sprayed material.

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Inventors: Bocker, Ernst (Leverkusen, DT)
Kracht, Wolfgang (Leverkusen, DT)
Rupp, Roland (Leverkusen, DT)
Schellmann, Erhard (Cologne, DT)
Trescher, Viktor (Leverkusen, DT)
Ullrich, Martin (Leverkusen, DT)

Application Number: 798447
Filing Date: 1977-05-19
Publication_date: 1978-05-30
Assignee: Bayer Aktiengesellschaft (DT)
Primary Class(es): 425/10 264/14, 425/378.1, 425/382.3, 425/DIG230
Other Classes:
US Patent Ref:

3078513	Feb, 1963	Levison et al.	425/376.
3202731	Aug, 1965	Grevenstuk et al.	264/14.
3386131	Jun, 1968	Vanzo	425/378.
3421182	Jan, 1969	Colombo	425/378.
3887692	Jun, 1975	Gilman	264/14.

Other Refs:
Primary Examiner: Spicer, Jr., Robert L.
Assistant Examiner:
Attorney: Jacobs & Jacobs