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US 3,958,390 AGranted
Packaging
AssigneeHayssen Manufacturing Company
InventorsFrank E. Pringle, Jr., Harvey Heiner, Gary Lee Gehrke
Life of this patent
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AssigneeHayssen Manufacturing Company
InventorsFrank E. Pringle, Jr., Harvey Heiner, Gary Lee Gehrke
Estimating the term…
The method of and apparatus for packaging units in flexible sheet material which is heat-sealable at least on one side, in which a web of the material is formed into a tube with an inside-face-to-inside-face longitudinal seam by bringing the side margins of the web into inside-face-to-inside-face engagement and pressing them together at a sealing station, and heating the inside faces of said margins as they converge toward one another and meet at the sealing station by directing a stream of hot gas against them. Transverse seals are formed across the tube at package length intervals with a unit to be packaged in the tube between successive transverse seals. The gas may be a preservative gas for preservation of the unit in each package. Additionally, preservative gas may be introduced into the tube downstream from said sealing station.
The method of packaging units in flexible sheet material which is heat-sealable at least on one face thereof, comprising forming into a tube a continuous web of said material as it is fed foward with said one face of the material on the inside of the tube by bringing the side margins of the web into inside-face-to-inside-face engagement at a sealing station, said side margins converging toward one another as they travel toward and meet at said station, heating inside faces of said margins as they converge toward one another and meet at said station for heat-sealing them together by delivering hot gas between said margins and directing it to flow against the inside faces of said margins to heat said inside faces as said margins travel toward said sealing station, the gas impinging on said inside faces as said margins enter the sealing station, pressing the heated margins to seal them together at said station, and forming transverse seals across the tube at package length intervals with a unit to be packaged in the tube between successive transverse seals, the side margins coming together in a V with its apex at the sealing station and the gas being directed in downstream direction in relation to the travel of the web toward the apex of the V to impinge on the inside faces of the side margins as they meet at the apex of the V.
Apparatus for packaging units in flexible sheet material which is heat-sealable at least on one face thereof, comprising means for forming into a tube a continuous web of said material as it is fed forward with said one face of the material on the inside of the tube by bringing the side margins of the web into inside-face-to-inside-face engagement at a sealing station, said side margins converging toward one another as they travel toward and meet at said station, means at said station for pressing said margins together, means for heating the inside faces of said margins as they approach said pressing means comprising means for delivering hot gas between said margins and directing a stream of the hot gas to impinge on the inside faces of said margins as they enter said pressing means, and means for forming transverse seals across the tube at package length intervals with a unit to be packaged in the tube between successive transverse seals, said margins coming together in a V at said pressing means and said gas directing means comprising a nozzle positioned to direct a stream of gas in downstream direction in relation to the travel of the web toward the apex of the V to hot blast the inside faces of said margins as they meet at the apex of the V.
Apparatus for packaging units in flexible sheet material which is heat-sealable at least on one face thereof, comprising means for forming into a tube a web of said material as it is fed forward with said one face of the material on the inside of the tube by bringing the side margins of the web into inside-face-to-inside-face engagement at a sealing station, said side margins converging toward one another as they travel toward and meet at said station, means at said station for pressing said margins together, means for heating the inside faces of said margins as they approach said pressing means comprising means for directing a stream of hot gas on the inside faces of said margins, and means for forming transverse seals across the tube at package length intervals with a unit to be packaged in the tube between successive transverse seals, wherein said margins come together in a V at said pressing means and said gas directing means comprises a nozzle positioned to direct a stream of gas in downstream direction in relation to the travel of the web toward the apex of the V to hot blast said margins as they meet at the apex of the V, and further having means for diverting the stream of hot gas to flow out from between said margins.
Dependencies are inferred from the claim text.