Thermal bonding method for plastic bag and method of manufacturing plastic bag

Abstract

Provided is a thermal bonding method for a plastic bag, comprising: heat-sealing a heat sealing material interposed between a pair of heating bodies, wherein one of the pair of healing bodies has a microscopic linear protrusion having a semi-circular or trapezoidal sectional shape, and wherein the heated linear protrusion is pressed against a sealant of the heat sealing material to inject the sealant that has been melted at a temperature within a temperature zone for cohesive adhesion in a strip-like shape along a side edge of the linear protrusion so as to form a mold adhesion strip.

Dependencies are inferred from the claim text.