Aseptic filling paper container vertical seal tape and aseptic filling paper container with vertical seal tape

摘要

A sealing tape in a paper container for use in covering and sealing a seam being exposed to an inner surface of a paper container formed of a packaging material having a base layer made of a paperboard and outermost layers of both of front and back surfaces formed of heat-fusible synthetic resin, in which the sealing tape in a paper container is composed of a film having a multi-layered structure in which outermost layers of both of front and back surfaces are formed of heat-fusible synthetic resin layers and formed by a co-extrusion inflation method. In the film which is formed by the co-extrusion inflation method in which the resin is fused and formed at a temperature lower than that of the extrusion lamination method, and is not subjected to an excessive heat history as compared with films formed by other methods. Accordingly, the heat-fusible synthetic resin layers forming outermost layers of both of front and back surfaces of the film having the multi-layered structure exhibit more excellent sealing property at the time of fusion thereof, and the entire film having the multi-layered structure is formed while hardly being subj ected to the elongation. Therefore, the film exhibits excellent softness and elongation. As a result, the complete sealability can be obtained in the case of covering and sealing with a sealing tape of a seam being exposed to the inner surface of a paper container formed of the packaging material.