PRODUCTION METHOD OF PACKAGING FILM, PRODUCTION METHOD OF PACKAGING BAG, PRODUCTION METHOD OF PACKAGING CONTAINER, PRODUCTION METHOD OF LID MEMBER, PRODUCTION METHOD OF PACKAGING BODY

摘要

PROBLEM TO BE SOLVED: To provide technique by which a packaging bag, a packaging container, and a lid member are formed so that freshness of food such as vegetables and fruits is able to be kept stably for a long time, and a packaging film of superior endurance stability at a time of use is produced.SOLUTION: A production method of a packaging film of this invention comprises: a process to prepare a resin film 2; and a process to form a through-hole in the resin film 2 by laser irradiation with a laser irradiation apparatus 3. In the process to form the through-hole, the through-hole is formed while the laser irradiation apparatus 3 is swung in a width direction of the resin film 2 being perpendicular to a feed direction of the resin film 2 so that angle of incidence of laser beam to a surface of the resin film 2 changes.SELECTED DRAWING: Figure 3