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US 5,376,219 AGranted
High speed apparatus for forming foam cushions for packaging purposes
AssigneeSealed Air Corporation
InventorsCharles R. Sperry, Laurence B. Sperry
Life of this patent
Estimating the term…
Abstract
A sealing and severing apparatus is disclosed for sealing plastic bags formed in succession from stock plastic film material and then severing the sealed bags from one another. The bags are filled with a foamable composition while they are being formed so that when the formed and filled bags are placed in a container, the foamable composition fills the bag with foam to thereby produce a customized foam cushion for any objects in the container.
Claims14
A sealing roller system for sealing plastic film material that is in constant moving contact with a sealing roller, said sealing roller system comprising:
- a rotatable cylinder formed of a polymeric material that is sufficiently thermally conductive to dissipate heat quickly therefrom;
- an electrically conductive sealing wire wrapped around the circumference of said polymeric cylinder;
- means for periodically applying a voltage to said sealing wire to thereby generate a current therethrough sufficient to raise said sealing wire to a heated temperature that will seal plastic film material that is in moving contact with said cylinder, so that when plastic film material passes against said cylinder, said heated wire seals the plastic film material when such a sufficient voltage is applied, and so that when the applied voltage is lowered, said thermally conductive cylinder carries off sufficient heat to permit the sealing wire to leave a portion of the constantly moving plastic film material unsealed.
Dependencies are inferred from the claim text.