Method for manufacture of containers, particularly for packing purposes
AssigneeThe Mead Corporation
InventorMarcel G. Prot
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Abstract
A container, particularly for packing purposes, a method for manufacturing it and a machine for carrying out the method are described. The container comprises a cardboard sheath, a film of a material having thermobonding characteristics innerly lining the cardboard sheath at least close to its bottom end, a plastic bottom having a peripheral rim integral with the sheath by being bonded on a margin of said film and, at its end opposite to the bottom, a flange made of the same plastic material as that which makes the bottom, said flange being made integral with said sheath by the usual thermobonding techniques.
Claims8
A method for the manufacture of a container comprising a cardboard sheath and a plastic bottom, the method comprising the steps of:
- shaping the bottom by thermoforming of a plastic sheet using the sheath to provide a peripheral U-shaped rim in the plastic sheet having the same cross section as that of the sheath;
- making the rim integral with the sheath by bonding the rim with the lowermost portion of the inner surface of the sheath;
- parting the excess, on the exterior of the sheath, of plastic sheet used to make the bottom from the bottom such that the remaining plastic sheet has a downwardly extending flange juxtaposed and adjacent to the outer wall of the container sheath and a horizontally extending flange integral with the downwardly extending flange;
- moving relatively the remaining plastic sheet with the downwardly depending flange and the sheath to position the downwardly depending flange about the outer topmost portion of te sheath;
- and
- making the downwardly depending flange integral with the sheath by bonding the flange with the outer topmost portion of the sheath.
A method for the simultaneous manufacture of a plurality of containers, each comprising a cardboard sheath and a plastic bottom, comprising:
- shaping the bottoms of all the containers by thermobonding of a plastic sheet using the sheaths of the containers in order to provide on each bottom a peripheral U-shaped rim in the plastic sheet having the same cross section as that of the corresponding sheath;
- making the rim of each bottom integral with the sheath with which it is associated by bonding the rim with the lowermost portion of the inner surface of the sheath;
- parting the excess, on the exterior of each sheath, of plastic sheet used to make the bottoms from the bottoms such that the remaining plastic sheet has downwardly extending flanges juxtaposed and adjacent to the respective outer walls of the contianer sheaths, and horizontally extending zones integral with the downwardly extending flanges between the recesses defined by the downwardly extending flanges;
- moving relatively the remaining plastic sheet with downwardly depending flanges and the sheaths to position the downwardly extending flanges of the plastic sheet about the outer topmost portions of the sheaths;
- and
- making the downwardly depending flanges integral with the respective sheaths by bonding the flanges with the respective outer topmost portions of the sheaths, so that all the containers of the plurality of containers are connected to one another through the horizontally extending zones of the plastic sheet.
Dependencies are inferred from the claim text.