Sly Process Systems’ “Super Duty” PET crystallizer(s) / crystallizing systems are the result of almost20 years experience in the design, application, and manufacture of high performance crystallizer(s) /crystallizing systems.
Amorphous PET resin, regrind, and post consumer bottle flake must first be surface crystallized beforedrying in order to avoid agglomeration and plugging issues within the drying vessel. The crystallizingprocess involves heating the amorphous resin to a temperature above the glass transition (Tg)temperature (normally 158-176°F or 70-80°C). Rapid crystallization occurs between 194°F and 212°F (90-100°C), and the process is complete by the time the temperature reaches 275°F (135°C).The typical Sly Process Systems crystallizer / crystallizing system consists of a properly sized agitatedcrystallizing hopper, electric or gas air heater configured to deliver the required heating Btu, and anoptional cyclone dust collector if the material is particularly dusty.
While not a complex process, without proper controls and safeguards in place to prevent amorphousresin from reaching the lower regions of the crystallizing vessel, serious operational issues, and evendamage to the typical crystallizing hopper can result.
The Sly Process Systems crystallizer / crystallizing system monitors both the level and the temperatureof the resin in the top of the hopper and automatically regulates the speed at which material movesthrough the hopper in order to assure that every pellet or flake is crystallized before discharge.Crystallization takes place in the upper 1/3 of the crystallizer / crystallizing hopper, and the passagethrough the remainder of the hopper serves to break up any agglomerates before being discharged fromthe hopper. “Lump breakers” or screeners to post condition the material are not required with the SlyProcess Systems system.
The agitated crystallizing hopper is extremely robust and is designed to handle the occasional upsetcondition caused by an inexperienced operator, or upstream or downstream flow stoppages. Generallythe system will automatically compensate for variations in the process without requiring operatorintervention.
Sly Process Systems provides a full line of bulk material handling equipment and processing systemsfor your plant. Some examples of our products include Storage Silos, Pneumatic Conveying Systems,Gravimetric & Volumetric Blending and Metering EQ, Bag / Box / Drum Unloading and Filling Systems,Machine Loaders, Complete Turnkey Systems, and Aftermarket Parts.
Inquiries should be sent to:
Sly Process Systems LLC
8300 Dow Circle
Suite 600
Strongsville, OH 44136
Telephone: (888) 507-4133
Fax: (440) 891-3210
www.slyprocesssystems.com
sales@slyprocesssystems.com
