[특허]Method for applying coatings to solid particles

Method for applying coatings to solid particles 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	A61K-009/00 B05D-007/00
출원번호	US-0532034 (1974-12-12)
발명자 / 주소	Blouin Glenn M. (Florence AL)
출원인 / 주소	Tennessee Valley Authority (Muscle Shoals AL 02)
인용정보	피인용 횟수 : 61 인용 특허 : 0

초록 ▼

The apparatus provides a homogeneous (with respect to particle size), dense, mass of sized particles in random motion so that highly uniform coatings of the same or of different solids can be applied to each particle by conventional spray-coating with the liquified coating material(s). The apparatus is a horizontal rotary drum containing lifting flights. A novel deflector pan is fixed in space inside the upper section of the drum which deflects particles falling from the lifting flights to the side of the drum where they form a narrow, dense falling cascade. The coating material is sprayed onto the cascading particles, preferably as they free-fall after leaving the lower edge of the pan. However, if desired, some or most of the coating material may be directed onto the top edge of the moving bed including the juncture of the cascade therewith.

대표청구항 ▼

A process for the formation of coated rounded particles of substantially uniform size which comprises introducing the material to be coated into the inlet end of a rotating drum, the axis of which drum is maintained in a generally horizontal attitude; therein maintaining a bed of rolling discrete nuclei particles of substance to be coated in which bed said nuclei are in contact with each other, said rotating drum having lifting flights on the inner surface thereof acting to elevate portions of said bed from the bottom of said drum to a higher point therein; releasing said elevated portions of said bed on said lifting flights and cascading same onto a generally horizontally inclined plane over substantially the full upper surface thereof, said plane fixed in space inside the upper hemispherical section of said drum and extending substantially therethroughout whereby said particles Are moved downwardly over the upper surface of said horizontally inclined plane to a lower edge thereof juxtaposed a sidewall of said drum, wherefrom said particles free-fall back to the bed of nuclei juxtaposed the bottom of said rotating drum; spraying localized portions of said particles after their release from the bottom edge of said inclined plane with the coating material, thereby ensuring that at least a portion of the coating material so sprayed is directed upon a dense cascade of particles which are substantially particle size homogeneous; and removing at least a portion of the resulting spray-coated particles from the outlet end of said drum; said process characterized by the fact that it ensures that the localized portion of particles, which is sprayed to effect coating thereby, is substantially particle size homogeneous, thereby effecting substantially uniform coatings on each particle released from said lifting flights.

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