The narrow-width note where it is constituted by the roll opposite for tearing induction formation, and for

摘要

PROBLEM TO BE SOLVED: To provide a roll pair for forming a tear inducing crack to a packaging bag capable of forming various kinds of the tear inducing cracks of the packaging bag simply and easily with a small quantity of equipment costs and setup man-hours, and moreover, capable of shortening a preparative period greatly required for forming a new tear inducing crack.;SOLUTION: The roll pair for forming a tear inducing crack extending toward a narrow width spout passage in at least one side of the vertical sealing section and the horizontal sealing section of a packaging unit having the narrow width spout passage located to one end side of an upper end portion or a lower end portion consists of an anvil roll and a die roll which are rotated in mutually reverse directions. A housing recess for housing the swelled portion of the packaging bag after being filled up with a packaged article is formed in the circumferential face of the anvil roll, and the die roll is constituted of a magnetic roll and a flexible die having the rear face magnetically attracted on the circumferential face of the magnetic roll and the surface provided with a specified cutting blade protrusively formed.;COPYRIGHT: (C)2009,JPO&INPIT