Paper receptacle

Details Paper receptacle Paper receptacle

1998-02-23

2000-07-25

Dye, Rena L.

Stock material or miscellaneous articles

Hollow or container type article

Paper containing

428163, 428192, 4285375, 220608, 426113, 426127, 229 58, 229 581, 229 584, 229406, 229407, 229902, 493148, 493158, 493160, 156224, 156580, 156581, 264320, B65D 134, B29C 5300, B31B 125

Patent

active

060934603

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to paper receptacles, and particularly to a paper receptacle with a curled periphery, paperboard (cardboard) used as the material for the paper receptacle, a method for forming the paper receptacle, and a machine for forming the paper receptacle.


BACKGROUND ART

Plastic receptacles made of synthetic resin such as polypropylene are conveniently used as lightweight and cost-effective receptacles for foods. However, the plastic receptacles, though very convenient, have a problem in destruction by fire. That is to say, the combustion calorie of synthetic resin is much larger than those of paper and the like and hence it generates a great amount of combustion heat for its bulk. Accordingly, temperature in the incinerator rises very high, which may damage the incinerator or reduce its life time.
For the reasons above, demands for paper receptacles with low combustion calorie are increasing these days, as substitutes for the plastic receptacles. The table below shows a comparison of combustion calories between a paper receptacle and a plastic receptacle with the same bulk.


TABLE 1 ______________________________________ Plastic Paper Receptacle Receptacle ______________________________________ Capacity 150 ml the same Size 110 mm square .times. the same 27 mm high Material Area 220 cm.sup.2 the same Material Three-layers polypropylene Composition structure of: sheet (500 .mu.m) polymethyl pentene (22 .mu.m), paperboard (390 .mu.m), vinyl resin coat (2 .mu.m) Combustion 33 Kcal/piece 110 Kcal/piece Cal. ______________________________________


______________________________________ Specific Combustion heating gravity (g/cc) value (KCal/Kg) ______________________________________ Paperboard 0.75 4,400 polymethyl 0.83 11,000 pentene Vinyl resin 1.40 4,500 Polypropylene 0.91 11,000 ______________________________________
As can be clearly seen from the comparison above, the heating value of combustion of a paper receptacle is about one-third, or smaller, of that of a plastic one with the same bulk capacity.
FIG. 20 is a perspective view of a conventional rectangular paper receptacle with a curled periphery.
Referring to the figure, the rectangular receptacle has a bottom 123, peripheral walls 119 and 121 turned upwardly at a certain angle from the four sides of the bottom 123, peripheral corners 125 where the peripheral walls 119 and the peripheral walls 121 are connected, a flange 126 formed in the horizontal direction at the upper ends of the peripheral walls 119, 121 and the peripheral corners 125, and a curling 127 formed around the outer periphery of the flange 126.
FIG. 21 is a diagram showing the appearance of a blanked paperboard material for forming the receptacle shown in FIG. 20.
Referring to the figure, the paperboard material 101 is composed of a rectangular sheet material with four rounded corners. The dotted line shows the boundary corresponding to the bottom 123 of the formed receptacle. The parts located above and below it correspond to the peripheral walls 121, whose peripheries form peripheral straight portions 103. The parts located on the right and left sides of the bottom 123 correspond to the peripheral walls 119, whose peripheries form peripheral straight portions 105. As the parts corresponding to the peripheral corners 125, A score lines 117 are formed in the areas A to the outer periphery on radii extending from the central positions of the curved portions, 115a and 115b which are located in the bottom 123. The edges of the peripheral corners 125 form the curved portions 109 like circular arcs around the center positions 115a and 115b of the curved portions. In this diagram, the areas A are subjected to drawing in die forming or the like. The corners of the dotted line defining the bottom 123 are defined by the arcs of concentric circles with respect to the curved portions 109 around the centers 115a and 115b of the curved portions.
FIG. 22 is a pro

REFERENCES:
patent: Re32270 (1986-10-01), Murray, Jr.
patent: 2997927 (1961-08-01), Carson
patent: 3752387 (1973-08-01), Arfert
patent: 4026458 (1977-05-01), Morris et al.
patent: 4183435 (1980-01-01), Thompson et al.
patent: 4442969 (1984-04-01), Holden
patent: 4775560 (1988-10-01), Katsura et al.
patent: 4900594 (1990-02-01), Quick et al.
patent: 5009939 (1991-04-01), Goldberg
patent: 5585027 (1996-12-01), Young
patent: 5593610 (1997-01-01), Minerich et al.

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