Method for producing coated fertilizer
AssigneeChissoasahi Fertilizer Co., Ltd.
InventorsToshio Fujita, Chigo Takahashi, Masanari Ohshima, Tsunezo Ushioda, Hirozo Shimizu
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Abstract
Granular slow-releasing fertilizers completely coated with water-resisting resin are produced in such a manner that the coated granules do not stick together, through one step operation by spraying a solution of the resin which has the property capable of maintaining the solution state while it is hot but turning into jelly-like gel when it is cooled, on granules of fertilizer and drying the said granules with a high speed drying hot air on the spot upon being sprayed with the solution of the resin.
Claims15
A method for producing slow-releasing granular fertilizer fully coated with water-resisting, transparent, lustrous layer of resin in such a manner that the coated granules do not stick together, which comprises spraying a solution having a viscosity of 40 C.P. or less at close to its boiling point of a thermoplastic resin in a hydrocarbon or chlorinated hydrocarbon solvent, upon fertilizer granules, and drying said fertilizer granules upon being sprayed with said solution, continuously and immediately on the spout with hot, dry air at an air speed of at least 15m/sec., said solution having the property capable of forming a solution while it is hot but turning into jelly-like gel when it is cooled and said granules being at a temperature of 40.degree.-90.degree. C during the drying and spraying steps.
A method for producing slow-releasing granular fertilizer fully coated with water-resisting transparent, lustrous layer of resin in such a manner that the coated granules do not stick together, which comprises spraying a solution having a viscosity of 40 C.P. or lower at close to its boiling point of a thermoplastic resin and an additive thereto, in a hydrocarbon or chlorinated hydrocarbon solvent, upon fertilizer granules, and drying said fertilizer granules upon being sprayed with said solution, continuously and immediately on the spot with hot, dry air at an air speed of at least 15m/sec., said solution having the property capable of forming a solution while it is hot but turning into jelly-like gel when it is cooled, said granules being at a temperature of 40.degree.-90.degree. C during the drying and spraying steps.
Dependencies are inferred from the claim text.