POROUS LAMINATION FILM AND MANUFACTURING METHOD THEREOF

摘要

PURPOSE: An air-permeable lamination film and a manufacturing method thereof are provided to safely use a heating device such as a hot pack by uniformly maintaining air permeability of the heating device and to manufacture the laminating film with low permeability. CONSTITUTION: A manufacturing method of an air-permeable lamination film includes the following steps: mixing and melting compound compositions for the air-permeable lamination film; manufacturing the film by extruding the mixed compound compositions; manufacturing the air-permeable lamination film by shrinking the film in a different direction; preparing the two air-permeable lamination films; applying an adhesive on a first air-permeable lamination film(10); and laminating a second air-permeable lamination film(20) on the top of the first air-permeable lamination film.