Peelable seal
AssigneePharmachem Corporation
InventorWilliam E. R. Watt
Life of this patent
Estimating the term…
Abstract
Containers for storing food, medicaments, blood, and the like having a peelable seal formed by sealing together an oxidized surface of a polyolefin film.
Claims9
A peelable seal which is formed with at least two extruded polyolefin film members by the simultaneous application of controlled heat and pressure to said film members at the portion to be sealed, wherein at least one surface of at least one of the polyolefin film members at the portion to be sealed is oxidized by treatment with corona discharge so that the surface crystals formed by extrusion are modified whereby the simultaneously applying of controlled heat and pressure softens the modified crystals at the contacting surface to partially fuse the crystals at the contacting surface while maintaining the integrity of the crystals, and the modified crystals form an interface between the polyolefin film members at the seal portion.
Dependencies are inferred from the claim text.