Envelopes – wrappers – and paperboard boxes – Paperboard box – End structure
Patent
1979-11-16
1981-11-10
Moorhead, Davis T.
Envelopes, wrappers, and paperboard boxes
Paperboard box
End structure
229 56, 229 57, 229 43, B65D 304, B65D 504
Patent
active
042993504
ABSTRACT:
An improved composite container is disclosed including a tubular fibrous body wall having at its upper end a reversely curled portion the upper extremity of which is radially inwardly compressed in such a manner as to form an annular external locking projection by means of which a synthetic plastic closure cap may be fastened to close the container. Preferably the closure member is connected with the container by a tearable tamperproof connection including a radially inwardly directed annular rib that is locked beneath the annular body projection to maintain the closure cap on the container. A method is also disclosed for forming the container body, including the steps of radially outwardly curling the upper end of the body member, radially inwardly comressing the upper extremity of the reversely curled portion, and mounting a synthetic plastic snap-type closure member on the compressed curled end. In one embodiment, a circumferential recess is formed (for example, by skiving) in the outer surface of the tubular fibrous body wall prior to the reverse curling step, whereby the upper extremity of the reversely curled portion is radially inwardly compressed into the recess.
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Boise Cascade Corporation
Moorhead Davis T.
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