초록 ▼

A method and apparatus for forming a tube and bag from a supply of thin thermoplastic film with the film being formed into tubular shape about a filling tube with the edges of the film brought together and joined solely by a zipper strip having reclosable pressure interlocking members thereon with t

A method and apparatus for forming a tube and bag from a supply of thin thermoplastic film with the film being formed into tubular shape about a filling tube with the edges of the film brought together and joined solely by a zipper strip having reclosable pressure interlocking members thereon with the zipper strip preferably heat sealed to the film and the zipper strip having a web between the pressure interlocking members which provides a tamper-evident juncture between the edges of the film so that the web must be severed for access to the interior of a bag formed from the film, and individual bags formed from the continuous tube by filling the tube through the filling tube and cross-seaming and cutting individual bags from the continuous film tube.

대표청구항 ▼

The method of forming a vertical tubular form fill reclosable bag from a sheet of plastic film comprising the steps: continuously feeding a supply of thin thermoplastic film from a supply means; wrapping the film into tubular shape over a filling spout bringing the lateral edges of the film together

The method of forming a vertical tubular form fill reclosable bag from a sheet of plastic film comprising the steps: continuously feeding a supply of thin thermoplastic film from a supply means; wrapping the film into tubular shape over a filling spout bringing the lateral edges of the film together in adjacent relationship to form a tube; feeding a continuous supply of plastic zipper strip having webs with first and second reclosable pressure interlocking members thereon into a space between said film edges; attaching the webs of said members to the film between said film edges so that said strip provides the sole means joining said edges and said strip provides a reopenable closure for a bag formed of said film; and wherein said interlocking members are joined by one of said webs and said one web must be separated for access to the interior of a bag formed by said film.