There’s a big incentive for molders of small medical parts to increase production efficiency by going to 16, 32, or even more cavities using hot runner/valve gate systems. Molders have always had great success with Eastman Tritan^™ copolyester for medium-to-large components of medical devices and electronic instruments. Recently, our commitment to small, multicavity solutions began delivering big results. 

With any polymer, poor and uneven cooling can result in:
•  Increased cycle time
•  High levels of residual stress
•  Increased warpage
•  Sticking and difficulty in ejection 

Considering the unique properties of Eastman Tritan^™ copolyester, a few important guidelines will improve efficiency and part performance. 

The Tritan experts at Eastman are hosting a live webinar on December 10, 2015, from 11:00 to 12:00 EST. This webinar will cover these important considerations to help you design for manufacturability:

Proper Gating Selection
 
  •Select a compatible gating style for the selected resin. Most conventional cold gating styles work well with copolyesters. For hot runner systems, valve gates should be used.
 
Design Tooling with good Cooling/Thermal Control
 
  •Copolyesters require good thermal control throughout the cavity for optimal processing.
 
Design Tooling with a plan for venting
 
  •Poor venting can result in burn marks and incomplete fill.
 
Design Tooling with a plan for ejection
 
  •Parts should be adequately supported during ejection to avoid part deformation/breakage
 
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