Methods for Lowering Melt Viscosity and Improving Heat-sealability of Polyester and for Manufacturing a Heat-sealed Container or Package
Research output: Patent › Scientific
|IPC||B29C 71/ 04 A I|
|Publication status||Published - 12 Jan 2017|
|Publication type||H1 Granted patent|
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.