TUTCRIS - Tampereen teknillinen yliopisto

TUTCRIS

Methods for Lowering Melt Viscosity and Improving Heat-sealability of Polyester and for Manufacturing a Heat-sealed Container or Package

Tutkimustuotos: Patentti

Yksityiskohdat

AlkuperäiskieliEnglanti
PatenttinumeroWO2015110980
IPCB65D 65/ 38 A I
Prioriteetti päiväys24/01/14
TilaJulkaistu - 30 heinäkuuta 2015
OKM-julkaisutyyppiH1 Myönnetty patentti

Tiivistelmä

The invention relates to methods for lowering the melt viscosity and thereby improving heat-sealability of a polyester. The invention also relates to a method for manufacturing a heat-sealed container or package from fibrous- based, polyester-coated packaging material, and a method for heat-sealing polyester. The solution according to the invention is subjecting polyester to electron beam (EB) radiation. The lowered melt viscosity allows a lower heat- sealing temperature, and permits sealing of polyester to an uncoated fibrous surface. The preferred polyester for the invention is polylactide, as such or as blended with another polyester.