Making a tough,
clear, uniform bottle out of PET pellets is a remarkable example of the
synergistic interactions possible between a polymer’s properties and the
fabrication process. This course is a practical introduction to the chemistry
and physics of poly(ethylene terephthalate), as they relate to injection molding
preforms and blow molding bottles.
Topics include:
- Pellets to Bottles: Molding PET by Changing Physical States
- Melting in the Extruder
o Crystallinity
o Copolymers
o IV
o Hydrolysis: the need for drying
o Thermal degradation
- Molding Preforms
o Viscous flow and shear heating
o AA generation
o Crystallinity again
o Heat transfer
- Reheating preforms
o IR absorption
o Additives
- Blow Molding Bottles
o Stretching behaviour
o Orientation and strain-induced crystallinity
o Change in properties of PET
- Who makes PET now?
o Where to get specific grade information
- Special topics
o Heat set grades
o Mineral water grades
o High barrier resins including PEN
Who should
attend?