Pretreatments and Their Durability in Extrusion Coated Products

摘要

1. Good adhesion needs also chemical bonding 2. With LDPE this means that suitable oxidation carbonyi (groups) needed 3. Melt temperature is most important (slides 12,13,14 and 16) 4. Line speed (time in the air gap) is important, too (slide 15) 5. The oxidation occurs in the air gap (nip distance and line speed) (slide 11) 6. All parameters that increase aldehydes, ketones, esters increases the bond (slide 5) 7. Ozone oxidized molten polymer in right side, but is not enough for acceptable adhesion with difficult substrates (slides 15 and 18) 8. Adhesion values depends on substrate but also measurement method effects (slides 17 and 18) 9. With ozone treatment lower melt temperature can be run to reach enough chemical bonding (slides 16 and 17) 10. Best adhesion can be achieved when substrate is pretreated (Corona, Flame or Plasma) and ozone also used (slides 13 and 23) 11. No big differences between Corona or Flame (slides 13 and 14) 12. No better if all (Oz+C+F) are used (slides 13 and 14).