Heat-sealable coated paper container and method of manufacture
AssigneeMichael Hoerauf Maschinenfabrik GmbH & Co. KG
InventorGerhard Clauss
Life of this patent
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Abstract
A wound double-walled container and method of manufacturing the same from coated paper includes two blanks which are placed one above the other and which form the container walls. The blanks are arranged mutually offset in such a manner that narrow foldable strips project laterally and foladble rim portions extend at the top and bottom, which are folded over for sealing the inwardly and outwardly and endwise disposed cut edges. The folding-over takes place either after the winding of the blanks or while the individual blanks are still flat, which thereafter are wound separately one after the other about a winding mandrel and are sealed.
Claims16
A paper container of heat-sealable coated surface protected material comprising a wound container wall means and a container bottom means connected therewith, said container wall means being formed of a plurality of blank means bonded to one another, one of said blank means forming an inner wall means of said container and including a foldable portion projecting beyond a respective edge of another blank means, said another blank means forming an outer wall means, said another blank means forming an outer wall means and including a foldable portion extending beyond a respective edge of said inner wall means, said foldable portion of the inner wall means being foldable outwardly to cover off the respective edge associated therewith, said foldable portion of the outer wall means being foldble inwardly to cover off the respective edge associated therewith of said inner wall means, said foldable portions of said inner wall means and said outer wall means forming an area of overlap when said container wall means is wound wherein said covered off respective edge of said inner wall means and said covered off respective edge of said outer wall means are disposed within said area of overlap and spaced a distance relative to one another, whereby said container wall means is sealed inside and outside.
A method for manufacturing a paper container of double-walled construction from heat-sealable coated surface-protected cardboard which includes a wound container wall and a container bottom connected therewith, comprising the steps of placing finished blanks for an inner wall and an outer wall flat and one above the other in such a manner that a projecting rim portion of the blank of the inner wall and a projecting rim portion of the blank of the outer wall will result, folding over the projecting rim portions in such a manner that the respective edges of the blank beyond which the respective rim portions extend are covered, winding the double-walled blank with folded rim portions into a container wall in such a manner that the edges covered by the folded over rim portions are staggered with respect to one another within an area of overlap formed when the double-walled blank is wound, and securing a bottom to an open end of the wound container wall.
Dependencies are inferred from the claim text.