Patent ID: 6837025

Claim:
A high-frequency heat-sealing apparatus for making a container shaping a packing material of a laminate including a thermoplastic resin layer and a conductive material layer in a tubular shape, said packing material defining a longitudinal direction and a transverse direction, and for heat-sealing said tubular packing material transversely together with a fluid and cutting an end portion of the container, thereby defining an sealed one, interior side, outer side and cutting side with respect to the container, comprising: a first pressing member; and a second pressing member openable and closable together with said first pressing member, wherein, each of the first and second pressing members having a flat action face, wherein one of said first and second pressing members including a high-frequency heating mechanism, a surface of said heating mechanism being flush with the action face and defining a portion of the action face, wherein a groove is formed on the action face of the pressing member which had been equipped with said high-frequency heating mechanism, said groove being inscribed in the end portion inside the sealed zone, and wherein a flash portion for a molten thermoplastic resin is formed adjacent to the outer side on the cutting side of the sealed zone wherein the groove extends over the whole area of the transverse direction along the container's interior side of the sealed zone, and includes a partial curve in the end portion.