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AssigneeOji Paper Co., Ltd.
InventorsMitsuhiro Sano, Nobuo Wakabayashi, Hiroaki Mikamo, Keiichi Ikeda, Isao Shoji, Shiro Nagasawa, Nobuyuki Tohyama
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The present invention is a sheet having a serrated cutting edge attached to a carton case containing a roll of a cooking sheet such as a synthetic resin film, paper sheet and metallic foil, the sheet having a serrated cutting edge used for cutting the cooking sheet. The sheet having a serrated cutting edge is made of a vulcanized fiber. A moisture-proof film of a synthetic resin is formed on the two surfaces of a vulcanized fiber blank in order to make the most of the rigidity and elasticity which are advantages of the vulcanized fiber and decreases moisture absorption which is a disadvantage thereof. The invention also is a carton to which the sheet having a serrated cutting edge is adhered to as well as to a method of adhering the sheet having a serrated cutting edge to the carton by utilizing the moisture-proof film and ultrasonic adhesion.
A vulcanized fiber sheet having a serrated cutting edge, comprising a vulcanized fiber blank having two outer surfaces provided with a moisture-proof low-density polyethylene film, said serrated cutting edge being formed on at least one edge of said sheet.
A carton to which a vulcanized fiber sheet having a serrated cutting edge and two outer surfaces is adhered, said carton having a carton body and a cover, said carton body comprising a bottom wall panel, a front wall panel, a rear wall panel and side panels, said cover covering an opening of said carton body, a moisture-proof film being formed on the two outer surfaces of said vulcanized fiber sheet, said moisture-proof film being a low density polyethylene film.
A method of adhering a vulcanized fiber sheet having a serrated cutting edge to a carton blank, said carton blank comprising a bottom wall panel, a front wall panel, a rear wall panel, side panels and a cover, said method comprising the steps of forming a moisture-proof low-density polyethylene film on said vulcanized fiber sheet and adhering said vulcanized fiber sheet through said moisture-proof film to a predetermined portion of said carton blank by an ultrasonic adhesion method.
Dependencies are inferred from the claim text.