Envelopes – wrappers – and paperboard boxes – Paperboard box – End structure
Reexamination Certificate
2006-05-09
2006-05-09
Mai, Tri (Department: 3727)
Envelopes, wrappers, and paperboard boxes
Paperboard box
End structure
C229S005600
Reexamination Certificate
active
07040527
ABSTRACT:
A cylindrical body of a fiber drum comprises a roll of paper material having two open ends, and a curled portion formed by inwardly curling the edge of at least one of the two open ends. A method of fabricating the fiber drum comprises the steps of winding a length of paper sheet in layers, between which an adhesive is applied, to form a roll of the paper sheet having two open ends, and inwardly curling the edge of at least one of the two open ends of the roll to form a curled portion before the adhesive is cured between the layers.
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Mai Tri
Taiyo Sealpack Co., Ltd.
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