Heat-sealing method for obtaining easy-opening package, involves cooling each projection in each corner of heat-sealing mold to reduce degree of adhesion with easy-opening portion in corner of package in mold

摘要

The heat-sealing method involves providing projections (1.1) with coolant conduits in each corner of a hollow heat-sealing mold. The coolant conduits communicate with the mold exterior via perpendicular conduit and with the channel on the surface of the mold to reduce the surface temperature of the projection to below heat-sealing temperature. The plastic laminates in the mold are heat-sealed together to form the package. The cooled projection reduces degree of adhesion with the easy-opening portion in the corner of the package. An independent claim is also included for an easy-opening package.