초록 ▼

A unique preferably Y-shaped tear line-forming perforation is formed in the sealed marginal portion of a flat bag made of confronting panels of synthetic plastic material sealed together at marginal portions thereof. The perforation is formed with a unique bag-puncturing tool having a faceted, taper

A unique preferably Y-shaped tear line-forming perforation is formed in the sealed marginal portion of a flat bag made of confronting panels of synthetic plastic material sealed together at marginal portions thereof. The perforation is formed with a unique bag-puncturing tool having a faceted, tapered tool head having preferably only three straight longitudinally extending bag-cutting edges converging to a bag-puncturing point at the end of the tool head. The sealed bag is placed against a support wall having a tool-receiving aperture therein and the bag-puncturing point of the tool head is positioned outside of the inner margin of a sealed marginal portion of the bag and pushed through the bag into the aperture of the support wall with an orientation which produces a Y-shaped perforation outside of said inner margin with one leg of the perforation extending from the point of intersection of the legs of the perforation in a direction away from the adjacent edge of the bag to establish a tear line direction which extends into a sealed bag portion to form a desired bag opening by tearing the bag through this tear line-determining leg of the perforation.

대표청구항 ▼

A method of making a tear line-forming perforation in a sealed bag made of confronting panels of manually tearable material having marginal portions thereof sealed together to define a sealed compartment within the bag containing a material to be sealed, said method comprising the steps of: providin

A method of making a tear line-forming perforation in a sealed bag made of confronting panels of manually tearable material having marginal portions thereof sealed together to define a sealed compartment within the bag containing a material to be sealed, said method comprising the steps of: providing an outwardly tapering faceted pointed tool head, the faceted tapered pointed tool head being formed by at least three, longitudinal extenting bag material slitting edges converging at a bag-puncturing point at the end of the tool, positioning said bag-puncturing point substantially beyond what is or will be the inner margin of a sealed marginal portion thereof, and forcing the tool head through said bag with an orientation where the bag material slitting edges of the tool head form a multi-legged tear line-forming perforation which terminates outwardly of said inner margin and comprises continuous slits intersecting at a common point with one of the legs of the perforation extending from said common point in a direction away from the adjacent edge of the leg along a line which passes within the sealed portion of the bag, so that the bag is opened when it is torn from the edge thereof through and beyond the latter leg, and then withdrawing the tool head from the punctured bag.