Apparatus for making container for storing food
AssigneeInternational Paper Company
InventorsGeorge H. Naugle, Robert L. Gordon, Richard J. Pines
Life of this patent
Estimating the term…
Abstract
Disclosed is a container for storing product and a process and apparatus for making the container. The container comprises a paperboard outer container and a plastic inner container which has been drawn and blow formed into the outer container. The container is characterized by plastic screw threads which extend from the plastic inner container around the upper portion of the outside of the paperboard outer container. The screw threads permit a cap to be screwed onto the container after product, e.g. food, is placed in the container. The screw threads are vacuum formed, preferably simultaneously with the blow forming of the plastic inner container.
Claims14
An apparatus for drawing and blow forming plastic into a paperboard outer container and vacuum forming plastic screw threads about the upper portion of said outer container comprising:
- (a) a female mold, said female mold comprising at least one vertical wall and a bottom wall;
- (b) a male mandrel comprising:
- (i) a drawing and blow forming member positionable within said female mold, said drawing and blow forming member provided with holes in communication with a source of gas whereby gas may be directed from the interior of said drawing and blow forming member into the interior of said female mold, said female mold and drawing and blow forming member being arranged and constructed so that a sheet of plastic may be drawn by said drawing and blow forming member into said female mold and thereafter blow formed in said female mold;
- (ii) screw thread forming means, including an annular screw thread forming surface spaced from and surrounding the upper portion of said member so as to be positioned adjacent an end of said female mold when said member is positioned within said female mold, said screw thread forming means including means providing communication between said surface and a source of vacuum, said screw thread forming means being arranged and constructed so that plastic screw threads may be formed about the upper outside portion of a paperboard outer container positioned in said female mold so that the upper portion of the outer container extends outside the female mold, said plastic screw threads being formed from plastic extending around the upper edge of said paperboard outer container and in close proximity about the outside of said upper portion of the outer container.
An apparatus for drawing and blow forming plastic into a paperboard outer container and vacuum forming plastic screw threads about the upper portion of said outer container comprising:
- (a) a female mold, said female mold comprising at least one vertical wall and a bottom wall;
- (b) a male mandrel comprising:
- (i) a member positionable within said female mold for drawing and blow forming plastic into a paperboard outer container positioned in the female mold, said member for drawing and blow forming provided with holes in communication with a source of gas whereby gas may be directed from the interior of said member for drawing and blow forming into the interior of said female mold, said female mold and member for drawing and blow forming being arranged and constructed so that a sheet of plastic may be drawn by said member for drawing and blow forming into said female mold and thereafter blow formed in said female mold;
- (ii) screw thread forming means, including an annular screw thread forming surface spaced form and surrounding the upper portion of said member so as to be positioned adjacent an end of said female mold when said member is positioned within said female mold, said screw thread forming means including means providing communication between said surface and a source of vacuum, said screw thread forming means being arranged and constructed so that plastic screw threads may be formed about the upper outside portion of a paperboard outer container positioned in said female mold so that the upper outside portion of the outer container extends outside the female mold, said plastic screw threads being formed from plastic extending around the upper edge of said paperboard outer container and in close proximity about the outside of said upper portion of the outer container.
Dependencies are inferred from the claim text.