The commercial PETs used were provided by Eastman Chemicals and Arena Recycling VOF, the Netherlands; Eastman PET is a rapidly crystallizing
injection molding grade PET, and RECO PET (obtained from Arena Recycling) is a slowly crystallizing
PET recycled from soft drink bottles.
Another consideration is the exothermic reaction that may occur in the crystallizing
Starlinger recently installed a new recycling system for PET nonwovens, consisting of a single-shaft shredder, RecoStar Basic single-screw extruder with two vacuum vents, a double-piston continuous backflush screenchanger, underwater pelletizer, crystallizing
dryer, and solid-stating unit.
The alloying and molding process developed by Remaplan started with a crystallizing
dryer, followed by an Erema Vacurema unit and then an extruder.
Erema combines predrying and crystallizing
with a proprietary "vacuum reactor" or densifier.
These include gas-fired crystallizer/dryers that save energy, two-stage drying and crystallizing
systems that extend the life of dryer components, and an on-line rheometer that monitors product intrinsic viscosity (I.V.) during pelletizing.
chemical compounds serves as a simple rite of passage for chemistry students.
At last month's HIV structure conference, he announced that the group had succeeded in crystallizing
this colorless, tasteless and odorless protein excludes nicotine and other potentially toxic "antinutrients," tobacco's fraction-1 protein could offer a safe food additive or pharmaceutical-grade (ultrapure) nutrient, he says.
Compound 46 begins crystallizing
at the top of the container, where hundreds of 2- to 3-millimeter needle crystals form a semipermeable meshwork.
the molecule and studying it with X-ray diffraction techniques, "we now know where they [the subunits] are and how they're related to each other,' Schiffer says.