Title:
PRODUCTION OF UNIFORM SPHERICAL PARTICLE
Document Type and Number:
Japanese Patent JPH05179005
Kind Code:
A
Abstract:
PURPOSE:To produce uniform spherical particles by dropping a raw material liquid having properties of curing by a thermal change through many nozzle holes under vibrating conditions in the vertical direction and curing the resultant droplets in a heated steam atmosphere or a cooled mist. CONSTITUTION:A raw material liquid (e.g. a suspension prepared by mixing an aqueous solution of polyvinyl acetal diethylaminoacetate with fine powder of erythromycin) having properties of curing by a thermal change is dropped from many nozzle holes in the perpendicular direction while forming droplets under vibrating conditions in the vertical direction. The resultant droplets are then cured in a heated steam atmosphere or a cooled mist such as water or oil to efficiently produce uniform spherical particles. When the droplets are especially brought into contact with the heated steam, a large quantity of heat transfer is instantaneously caused by releasing the heat of aggregation due to the aggregation or waterdrops on the droplet surfaces at a low temperature. Thereby, heating and curing of the droplets are effectively advanced. Furthermore, the heated steam or cooled mist prevents the droplets from being brought into contact with the nozzle holes or a nozzle plate to prevent the nozzle holes from being clogged by the curing of the raw material liquid at the outlets thereof.
Inventors:
WAKABAYASHI MINORU
HIROSE JUN
HIROSE JUN
Application Number:
JP35884791A
Publication Date:
July 20, 1993
Filing Date:
December 26, 1991
Export Citation:
Assignee:
KOBE STEEL LTD
International Classes:
B01J2/04; B05B17/06; B29B9/00; B29B13/02; C08J3/12; C08L23/04; (IPC1-7): B01J2/04; B05B17/06; B29B9/00; B29B13/02; C08J3/12; C08L23/04
Attorney, Agent or Firm:
Ueki Kuichi