Envelopes – wrappers – and paperboard boxes – Paper or paperboard cup
Reexamination Certificate
1999-09-23
2001-05-29
Elkins, Gary E. (Department: 3727)
Envelopes, wrappers, and paperboard boxes
Paper or paperboard cup
C229S004500, C229S186000
Reexamination Certificate
active
06237845
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a paper container made from a single sheet of paper blank and a method of making the same, which can be used as a food or drink container for such products as instant noodles, a flowerpot, or disposable drink cups, and which has a deep bottom and strong structural characteristics.
BACKGROUND OF THE INVENTION
Conventionally, easily formed plastic containers are often used for packaging and distributing foods and drinks or the like. Recently, however, paper containers have been reconsidered in view of various environmental problems encountered with the use of plastics such as outflow of environmental toxins, difficulty of plastic waste treatment after use, and the like. With regards to methods for manufacturing a paper container, there are well-known pasting and paper making methods. In one such conventional pasting method, for example, paper which has been subjected to a laminating process is used, two sheets of such paper each forming a barrel portion and a bottom portion of a container, respectively, and thereafter both sheets are subjected to adhesion with pressure and heat in a mold or other processing to be adhered and integrated together to form a container.
In another paper container making method, paper fibers are dispersed in water, the colloid solution thus obtained is filtered by a paper making net, paper material remaining on the paper making net is dehydrated to thereby make a prototype of a container, and thereafter the prototype of the container is hot air dried or heat pressed. In this method, however, there are drawbacks in that it is not only necessary to increase the number of steps and thus cost of manufacturing over the above pasting method, but also a container obtained by this method is weakened by water so that it cannot be used for a product requiring waterproofing such as a drink container or flowerpot.
For these reasons, there has conventionally been known a widely utilized drawing method for integrally forming a paper container integrally from a sheet of blank paper. According to this drawing method, containers having waterproof properties can be efficiently manufactured by using blank paper which has been subjected to lamination processing.
Since this type of paper container is formed integrally of a single sheet of blank paper, it can be relatively easily manufactured with a reduced number of steps. However, there are disadvantages in that setting conditions at the time of working are very severe. In particular, when the blank paper is subjected to deep drawing, the blank is injured. Accordingly, a conventional paper container obtained by the above drawing method has a shallow bottom and application thereof is restricted.
SUMMARY OF THE INVENTION
The present invention has been devised to overcome the above discussed disadvantages of the conventional paper containers, and an object thereof is to provide a paper container convenient for varied uses having a deep bottom, which is formed integrally of a single sheet of paper blank, and a method for manufacturing the same.
In order to achieve the above objects, the present invention provides a paper container formed of a single sheet of paper blank, wherein the paper container has a bottom face having a circular shape or a polygonal shape, an open upper face (serving as the mouth of the container), a peripheral wall face of the paper container comprising pleats and division faces formed alternately along a peripheral direction about the bottom face, which serves as the center of the container, side edges of the respective division faces are gathered upon one another and the division faces extend upwards towards an edge of the upper face opening, and the respective pleats are each formed in a double-folded triangular shape whose apex contacts with a peripheral edge of the bottom face and are folded on the respective division faces.
In a second embodiment of the present invention, a paper container is formed of a single sheet of paper blank, wherein the paper container has a bottom face having a circular shape or a polygonal shape and an open upper face, a peripheral wall face comprised of pleats having a double structure consisting of an inner wall folded in a cylindrical shape about the bottom face, which serves as the center of the container, and an outer wall surrounding the inner wall, respective upper ends of the inner wall and the outer wall being connected to each other as a folded-in portion, and the lower end of the outer wall projecting below the inner wall to serve as a supporting leg.
Furthermore, the present invention provides a method for manufacturing a paper container, comprising the steps of preparing a single sheet of paper blank by cutting the blank from an original paper in a predetermined shape, forming an annular ruled line of a regular polygonal shape at a central portion of the blank and forming V-shaped branch-like ruled lines spreading radially towards a peripheral edge of the blank from respective corners of the regular polygonal shape, dividing regions positioned between the respective branch-like ruled lines into two along symmetrical axial lines to make gusset portions and partitioning regions surrounded by the respective gusset portions as division faces, thereafter folding the annular ruled line in while folding the gusset portions in two along symmetry axial lines respectively to gather side edges of the respective division faces, forming a cylindrical body having an inside area defined by the annular ruled line, which serves as a bottom face, by folding the gusset portions constituting pleats on the respective division faces, and finally folding back an upper face opening edge of the cylindrical body outwardly (thus forming the lip of the mouth of the container).
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Fuse Tomoko
Hashimoto Masaru
Maekawa Jun
Nagashima Akira
Elkins Gary E.
Kuramae Sangyo Co., Ltd.
Townsend & Banta
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