REDUCTION OF SLACKNESS AND/OR CHANGING STRESS PROFILE OF FLAT TUBULAR FILM WEB MANUFACTURED USING INFLATION MOLDING TECHNIQUE

摘要

PURPOSE: To provide a method and an apparatus for easily reducing or eliminating a sag and/or a different property of a tubular film web to a maximum limit in the method and apparatus for reducing the slag and/or a varying stress profile of the flattened tubular film web produced by a blow molding. CONSTITUTION: The method for reducing a sag and/or varying stress profile of a flattened tubular film web comprises the steps of heating a tubular film web 5 along its width direction, cooling it and/ or pulling it.