Method of making free edge-sealed film articles
AssigneeDowbrands L.P.
InventorsBurdette W. Miller, John O. McCree, William D. Price
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Abstract
Free edge-sealed film articles and a method for making such, wherein the articles comprise a plurality of film portions and contain a free edge-seal between two of such portions, with one or both of the two free edge-sealed portions consisting essentially of a plurality of layers of diverse thermoplastic materials which are so ordered that on sealing the two portions together, the ordered layered film portion is curled toward the other of the two free edge-sealed portions.
Claims7
A method of making film articles having two film portions free edge-sealed together using a hot sealing wire wherein at least one of the two free edged-sealed film portions consists essentially of a plurality of layers of diverse thermoplastic materials, comprising the steps of:
- ordering the plurality of layers of diverse thermoplastic materials within a respective layered film portion such that on free-edge sealing the film portions together using a hot sealing wire, the ordered layered film portion is curled toward the other of the two film portions along at least a portion of the free-edge seal;
- clamping the two film portions approximately parallel to each other and closely enough together such that when curling occurs during free-edge sealing with a hot sealing wire the ordered layered film portion runs into or abuts the other of the two film portions, bridging the gap between the two film portions, and forming a seal with the other of the two film portions;
- and
- hot-wire sealing the film portions together along at least a portion of the free-edge seal.
Dependencies are inferred from the claim text.