Method and apparatus for making crystalline PET pellets
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United States of America Patent
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N/A
Issued Date -
N/A
app pub date -
Oct 1, 2004
filing date -
Nov 21, 2003
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A method and apparatus for underwater pelletizing and subsequent drying of polyethylene terephthalate (PET) polymers and other high temperature crystallizing polymeric materials to crystallize the polymer pellets without subsequent heating. High velocity air or other inert gas is injected into the water and pellet slurry line to the dryer near the pelletizer exit. Air is injected into the slurry line at a velocity of from about 100 to about 175 m.sup.3/hour, or more. Such high-speed air movement forms a vapor mist with the water and significantly increases the speed of the pellets into and out of the dryer such that the PET polymer pellets leave the dryer at a temperature sufficient to self-initiate crystallization within the pellets. A valve mechanism in the slurry line after the gas injection further regulates the pellet residence time and a vibrating conveyor after the dryer helps the pellets to achieve the desired level of crystallinity and to avoid agglomeration.
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Patent Citation Ranking
- 21 Citation Count
- C08F Class
- 85.29 % this patent is cited more than
- 20 Age