Champions for Change Critical Issues - Barrier Layers and Coatings

General issues

• effect on reclaiming process
• effect of bottle manufacture/appearance/performance
• effect of staple fiber manufacture/appearance/ performance
• effect of sheet, film & pipe (HDPE) manufacture/appearance/performance,
• effect on engineering resins manufacture/performance,
• effect of strapping manufacture (including solid stating) or appearance or performance
• effect on depolymerization efficiency or quality.

Specific issues

Where on the bottle will the layer/coating be?

1. Do layers readily delaminate and then separate from HDPE or PET?
2. Effect on grinding efficiency?
3. Effect of barrier material on increased flake loss in elutriation?
4. Effect of barrier material on “static cling” issue?
5. Effect of residual barrier material (how much to cause an effect) on

•  
  • Color in melted resin
  • Haze and black specks for PET, black specks in HDPE
  • ESC for HDPE
  • Melting point
  • Crystallization temperature and rate for PET
  • Fuming during extrusion
  • Excessive filter blinding and screen pack life
  • Bottle making for PET and HDPE (extrusion, viscosity, reheat, melt strength)
  • Spinning, drafting, and dyeing for PET.  Also tenacity, shrinkage, and fluorescence
  • Sheet making for PET and HDPE (color, gels, impact strength changes, tear strength, tensile modulus, pin holes, black speck occurrence, surface defects)
  • Solid stating rate for PET
  • Tensile, flexural, and impact properties for HDPE and PET

      6.  Food contact compliance

      7.  Deposits and plate out on dies, pins, and molds