The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 04, 1980
Filed:
Sep. 14, 1977
Dieter Muller, Sickte, DE;
Buehler-Miag GmbH, Brunswick, DE;
Abstract
Apparatus for crystallizing an amorphous material which is in granular form involves admitting the granular synthetic resin into a vertical crystallization zone and permitting the granular resin to descend through this zone under the influence of gravity. A counterflow of hot gas is passed through the descending granular resin and heats the latter to a temperature at which it transforms from an amorphous to a crystalline state. Once the granular resin has passed through the crystallization zone, it is subjected to abrasion for the purpose of separating crystalline particles which adhere to one another. An apparatus for carrying out the method includes a vertical vessel which extends outwardly and downwardly and which may be of rectangular or circular cross-section. An inlet for granular material and an outlet for spent gas are provided at the top of the vessel. An outlet for the crystallized material and an inlet for hot gas are provided at the bottom of the vessel. Baffles may be provided for distributing the hot gas evenly over the cross-section of the vessel. The vessel has a crystallization zone. Between this zone and the bottom of the vessel there is arranged a device for subjecting the crystallized material to abrasion. This device may be in the form of a plate mounted for reciprocating movement and provided with apertures of a size equal to the maximum particle size of the crystallized material. A shaft dryer may be arranged below the crystallization vessel to adjust the moisture content of the crystallized material to a desired value. The apparatus makes it possible to continuously crystallize granular synthetic resin at a high throughput and in an economical manner.