BACK LINING SEAL METHOD

摘要

PURPOSE:To prevent the generation of wrinkles of the rear side of a flat film by eliminating the slackening of the film and also certainly performing adhesion by a method wherein a core capable of supporting the mutual superposed part of the end parts of the flat film is arranged on a former and the end parts of the flat film are superposed one over another on the protruding flat upper surface of the core in a close contact state to be irradiated with laser beam. CONSTITUTION:A film 1 is guided so that the end parts of the film are superposed one over another on the protruding upper flat surface of the core 3 on a former 2 in a close contact state. The mutual superposed part of the end parts of the flat film 1 supported on the protruding upper flat surface of the core 3 in a close contact state is irradiated with laser beam by a carbon dioxide laser irradiation apparatus 4 to be sealed. The core 2 is composed of an aluminum alloy or stainless steel and provided to the almost central part of the former 2 so that the top part thereof is made planar and inclined surfaces are formed thereto on both sides thereof in the width direction so as to lower gradually.