Package making – Methods – Enclosing contents within progressively formed web means
Patent
1989-07-11
1991-07-02
Spruill, Robert L.
Package making
Methods
Enclosing contents within progressively formed web means
53472, 53474, B65B 902, B65B 2300
Patent
active
050275836
ABSTRACT:
The invention is a method of forming large-volume foam cushions for packaging purposes wherein each cushion comprises a closed bag formed from respective first and second superposed sheets of plastic material and filled with foam. The method comprises folding at least one of the first and second sheets of plastic material along one side edge portion of the sheets inwardly to form a first longitudinally extending gusset therein; folding at least one of the first and second sheets of plastic material along the opposite side edge portion of the sheets inwardly to form a second longitudinally extending gusset therein; longitudinally sealing the outer side edges of the first and second sheets together to form a gusseted tube thereof; transversely sealing the first and second sheet together along a line generally perpendicular to the longitudinal side edge seals to thereby form a closed end of the gusseted tube; injecting a predetermined amount of a foamable composition into the closed end of the gusseted tube; and transversely sealing the gusseted tube along a line longitudinally spaced from the first transverse seal to thereby form a sealed bag containing the foamable composition, wherein as the foamable composition foams the gussets expand to produce a cushion of greater volume.
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Johnson Linda B.
Sealed Air Corporation
Spruill Robert L.
LandOfFree
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