Flowlines are wavy or rippling surface defects. They can appear as lines, streaks, or patterns, but are consistent with the material flow within the cavity of the mold. They occur when the molten plastic passes through the mold or gate and can have many causes and corrective actions. 

Tritan Mold It is now a mobile app! Now, you can have the expertise to run Eastman Tritan^™ copolyester at your fingertips.
 
Use this handy mobile app to:

• Calculate drying time
• Calculate melt residence time
• Calculate shot capacity utilization
• Download data sheets
• Watch videos
• Get advice from the Tritan experts, and more. 

Get your hands on the Tritan Mold It app.
This handy processing resource helps you get the best results from Eastman Tritan^™ copolyester—and access valuable information on other engineering polymers. 
The Tritan Mold It app’s Quick Links function also makes it easy to dive deeper into Tritan applications, successes, and the latest tips for molding Tritan. 
 
​Download the free Tritan Mold It app now.    

 

Warping or distortion beyond specification can occur to parts as they are ejected from the mold or after packing and shipping. The final defects can look similar, but their causes are very different. 






 

TMI TIP: Proper cooling is well worth the wait when processing copolyesters. Their relatively low flexural modulus gives them a greater ability to flex and rebound—and allowing the skin to freeze is the best way to ensure optimum results. For more information, watch the webinar Copolyester Processing Solutions.

You can increase the chances of success in injection molding projects with early involvement of all major stakeholders. The many rewards of early collaboration include:

• Reduced product development time
• Optimized part performance
• Optimized cycle time
• Lower scrap rate

 

  

Gates are the belly buttons of the injection molding world—every molded part has one. The big difference is that molders can control the location of the gate. The location should be selected based on an evaluation of part aesthetic requirements, mechanical loading requirements, and fill pattern.  

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.