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A system for crystallization of polymers involving the use of a stationary housing with a rotor mounted for rotation within the housing. The rotor supports a plurality of spaced apart hollow discs and heated fluid is delivered to the interior of the discs. The polymer material to be treated is fed i

A system for crystallization of polymers involving the use of a stationary housing with a rotor mounted for rotation within the housing. The rotor supports a plurality of spaced apart hollow discs and heated fluid is delivered to the interior of the discs. The polymer material to be treated is fed into the housing for heat exchange contact with the exterior surfaces of the discs. The rotation of the discs in addition serves as the propelling force for the material along the length of the housing at which point the material is discharged. The speed of rotation of the rotor is controlled to influence agitation and conveying of material in the housing to thereby control the crystallization reaction. A holdup mechanism which operates independently of the speed control is located adjacent the discharge location to contribute to the fixing of the residence time. The material inlet operation, discharge operation and residence control are such that the ratio of crystallized to uncrystallized material is maintained within desired limits, typically at about 4 to 1. The method and apparatus provides various other operating parameters and structural features which maximize the efficiency of the crystallization reaction.

대표청구항 ▼

A method for crystallization of polymers comprising the steps of introducing a polymer material into a stationary housing, said housing having a rotor mounted for rotation within the housing and a plurality of spaced-apart hollow discs mounted along the length of said rotor, delivering a heated flui

A method for crystallization of polymers comprising the steps of introducing a polymer material into a stationary housing, said housing having a rotor mounted for rotation within the housing and a plurality of spaced-apart hollow discs mounted along the length of said rotor, delivering a heated fluid to the interior of the discs, delivering said polymer material through a feed inlet means associated with said housing whereby the material engages the exterior surfaces of the discs for heating of the material, driving said rotor whereby the discs of the rotating rotor operate to propel the material along the length of the housing, discharging crystallized material through an outlet means associated with said housing in spaced relationship to said inlet means, controlling the speed of rotation of said rotor to influence agitation and conveying of material in said housing, and restricting the discharge of material through said outlet means to fix the residence time of material independently of the influence of said speed of rotation, the residence time being controlled to maintain in the housing a ratio of crystallized material to uncrystallized material from 2 to 1 to 20 to 1.