초록 ▼

Disclosed is a process for pelletizing high melt flow crystalline polymers to produce crystalline pellet products. The process includes feeding a polyolefin granular or pelleted polymer into a melting/mixing mechanism to provide a molten polymer material. The molten polymer material is optionally pa

Disclosed is a process for pelletizing high melt flow crystalline polymers to produce crystalline pellet products. The process includes feeding a polyolefin granular or pelleted polymer into a melting/mixing mechanism to provide a molten polymer material. The molten polymer material is optionally passed through a melt pump and through a die to form a plurality of molten polymer strands. The plurality of molten polymer strands then are passed through or along a water trough declined with respect to the direction of the horizontal arrays where they are sprayed with cool liquid a plurality of times in such a manner that the sprayed cool liquid creates turbulent flow and disturbs a thin film of hot water and/or steam that forms around each molten polymer strand as it is cooled without undesirable axial acceleration of the polymer strands. Subjecting the molten polymer strands to such a cooling procedure produces cooled polymer strands, which then are fed to a cutting mechanism and cut into pellets. The process produces ultra high melt flow crystalline polymer pellets which are uniformly compounded.

대표청구항 ▼

1. A method of pelletizing polyolefin polymers having a melt flow of above 100 dg/min comprising:feeding a polyolefin granular or pelleted polymer into a melting/mixing mechanism to provide a molten polymer material; feeding the molten polymer material through a die to form a plurality of molten pol

1. A method of pelletizing polyolefin polymers having a melt flow of above 100 dg/min comprising:feeding a polyolefin granular or pelleted polymer into a melting/mixing mechanism to provide a molten polymer material; feeding the molten polymer material through a die to form a plurality of molten polymer strands in at least one horizontal array; cooling the plurality of molten polymer strands by feeding them through a water trough declined from the die with respect to the direction of the at least one horizontal array at an angle of 1 to 30 degrees from the at least one array and spraying the plurality of molten polymer strands with cool liquid a plurality of times in such a manner that the sprayed cool liquid creates turbulent flow and disturbs a thin film of hot water and/or steam that forms around each molten polymer strand as it is cooled without imparting undesirable axial acceleration on the strand to form cooled polymer strands; and pelletizing the cooled polymer strands in a cutting device to form polymer pellets.