Apparatus for making a zipper for a reclosable thermoplastic bag
AssigneeDowbrands L.P.
InventorsBrian C. Dais, Jose Porchia, Raymond R. Rydman
Life of this patent
Estimating the term…
Abstract
Disclosed is a zipper for a reclosable thermoplastic bag having opposing rib and groove profiles wherein at least one of the opposing zipper profiles has an longitudinally extending part interlockable and substantially free of interdigitation with the opposing profile and wherein the part is structurally discontinuous along its length. When the rib and groove profiles are interlocked, an audible clicking sound and/or a vibratory or bumpy feel perceptible to the touch is imparted. Further disclosed is a process and apparatus for making the zipper wherein a zipper profile is extruded and indentions are formed within and along it.
Claims6
An apparatus for providing a longitudinally extending zipper with indentations for a thermoplastic reclosable bag, comprising:
- (a) a means for receiving a longitudinally extending first profile having a longitudinally extending part interlockable with a longitudinally extending opposing second zipper profile;
- (b) a means for deforming the part to form indentions therein intermittently along its length, the deforming means comprising a first rotary member and a second rotary member, the first rotary member being positioned above the procession of the part, the first rotary member having a plurality of radially-situated, outwardly-projecting, spaced-apart teeth, the first rotary member being adapted and positioned so that the front portions of each tooth intersect the part when that tooth is generally normal or perpendicular to the part, the second rotary member having a circular planar surface, the second member being positioned below the procession of the part, such that upon interlocking the profiles the indentions within the part are substantially free of interdigitation;
- and
- (c) a means for providing the second zipper profile.
Dependencies are inferred from the claim text.