Loading patent…
AssigneeThe Continental Group, Inc.
InventorsRobert J. Weierman, Joseph J. Merle, Gerald A. Gordon, Peter N. Y. Pan, Rafael J. Hernandez
Estimating the term…
A closure for a container wherein a tape having a metal part and thermoplastic material which is applied to the container wall and heated. Most of the material is squeezed out from between the metal part and the wall into a rib which is formed during application. The material in the rib has an isotropic structural characteristic since the rib formation provides a region into which the excess material is directed minimizing the shearing effect of the flow of material along the interface with the container wall. Also the rib reinforces the tape in the critical region to resist pressure of gasses in the container when used to contain carbonated beverages. This patent covers a method of making the above described closure.
A method of forming a closure on a container wall having an external side and having a pour opening comprising:
A method of forming a closure on a container having a wall with a pour opening defined by a peripheral edge comprising:
A method of bonding a tab to a container panel having a dispensing opening therethrough, said method comprising the steps of providing a pull tab of a laminated construction including a metal foil outer layer and a heat bondable plastics material inner layer, providing said outer layer with an upstanding rib of a size and outline to extend about said dispensing opening, providing an anvil for positioning and heating the tab including a vacuum groove of an outline and cross section corresponding to that of said rib, positioning the tab on the anvil, maintaining the tab on the anvil by applying a vacuum in the vacuum groove, heating said tab through the anvil thus plasticizing the plastic material and applying said tab to the container panel under pressure causing the plastics material to bond to the container panel and causing the excess material to flow into the groove and also through the dispensing opening to form a flange on the opposite surface of the container panel.
Dependencies are inferred from the claim text.