A retort cup includes a tubular barrel portion formed of a barrel portion forming blank having a paper layer and thermoplastic resin layers; and a bottom portion which seals one of the openings of the barrel portion. The bottom portion has a downwardly bent peripheral edge portion. The barrel portio
A retort cup includes a tubular barrel portion formed of a barrel portion forming blank having a paper layer and thermoplastic resin layers; and a bottom portion which seals one of the openings of the barrel portion. The bottom portion has a downwardly bent peripheral edge portion. The barrel portion has an attached barrel overlap portion where both end edges of the blank are overlapped with each other and sealed, a lower fold-back portion which is formed at a lower end of the barrel portion by folding back the blank inwardly, and an upper fold-back portion which is formed by folding back the ends of the fold-back blank inwardly. The lower end of the barrel portion, the upper fold-back portion, and the peripheral edge portion of the bottom portion are sealed together. The peripheral edge portion is inserted into the lower fold-back portion.
대표청구항▼
1. A retort cup comprising: a tubular barrel portion formed of a barrel portion forming blank having a paper layer and thermoplastic resin layers provided on both surfaces of the paper layer; anda bottom portion which seals one of openings of the barrel portion, whereinthe bottom portion has a downw
1. A retort cup comprising: a tubular barrel portion formed of a barrel portion forming blank having a paper layer and thermoplastic resin layers provided on both surfaces of the paper layer; anda bottom portion which seals one of openings of the barrel portion, whereinthe bottom portion has a downwardly bent peripheral edge portion,the barrel portion has an attached barrel overlap portion where both end edges of the barrel portion forming blank are overlapped with each other and sealed, a lower fold-back portion which is formed at a lower end of the barrel portion by folding back the barrel portion forming blank inwardly, and an upper fold-back portion which is formed by folding back the ends of the fold-back barrel portion forming blank inwardly,the lower end of the barrel portion, the upper fold-back portion, and the peripheral edge portion of the bottom portion are closely sealed together, with the peripheral edge portion of the bottom portion being inserted into the lower fold-back portion,the paper layer has a cutout portion in which a corner portion of the paper layer on an upper side of the tubular barrel portion is removed, andthe thermoplastic resin layers include end edge extending portions that extend over a predetermined width from both respective end edges of the barrel portion. 2. The retort cup according to claim 1, wherein the end edge extending portion located inside the barrel portion in the attached barrel overlap portion is folded back to the outside of the barrel portion and located between the end edges. 3. The retort cup according to claim 1, wherein the end edge extending portion located outside the barrel portion in the attached barrel overlap portion is folded back to the inside of the barrel portion and located between the end edges. 4. The retort cup according to claim 1, wherein the end edge extending portion is provided over the total length of the end edge. 5. The retort cup according to claim 1, wherein the end edge extending portion located outside the attached barrel overlap portion comes into close contact with the barrel portion forming blank located inside the overlap portion. 6. The retort cup according to claim 1, wherein the thermoplastic resin layer includes a layer having a gas barrier property. 7. The retort cup according to claim 1, wherein the barrel portion forms a flange portion with a flat top surface. 8. The retort cup according to claim 1, wherein the corner of the paper layer of the barrel portion forming blank which is sealed by the bottom portion is cut out. 9. The retort cup according to claim 1, wherein the barrel portion has a thermoplastic resin layer provided so as to extend from the cutout portion. 10. The retort cup according to claim 1, wherein the end of the peripheral edge portion is spaced apart from each of the upper fold-back portion and the lower fold-back portion. 11. The retort cup according to claim 1, wherein at least one of the end edge extending portions is folded back and located between the end edges, andthe end surface of the paper layer is protected by the fold-back resin portion of the end edge extending portion. 12. A method of manufacturing a retort cup, comprising: punching a laminated sheet based on paper to form a blank in a predetermined shape;forming resin portions extending outwardly from end edges of the blank, respectively;folding back at least one of the resin portions; andbarrel portion forming by closely overlapping the end edges to form an attached barrel overlap portion. 13. The method of manufacturing a retort cup according to claim 12, wherein in the folding back the resin portion, one of the resin portions is folded back, and in the barrel portion forming the end edges are closely overlapped with each other to form an attached barrel overlap portion such that the fold-back resin portion becomes the inside of the other resin portion. 14. The method of manufacturing a retort cup according to claim 12, wherein the resin portion is formed so as to seal an end surface of the blank by thermal pressure-bonding,wherein in the folding back of at least one of the resin portions, one of the resin portions is folded back so as to protect the end surface of the blank by the fold-back resin portion, andwherein in the barrel portion forming, the end edges are closely overlapped with each other to form an attached barrel overlap portion such that the fold-back resin portion becomes the inside of the other resin portion.
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이 특허에 인용된 특허 (4)
Mannlein,Dean Joseph; Mitchell,James Joseph, Bottom sealing assembly for cup forming machine.
Leser, Chris K.; Driskill, Philip A.; Wallace, Charles T.; Euler, John B.; Paladino, Jason J.; Maravich, Milan C.; Davis, Daniel O.; Mann, Jeffrey A.; Bowlds, Randy A., Insulated container.
Leser, Chris K; Wallace, Charles T; Driskill, Philip A; Euler, John B; Paladino, Jason J; Maravich, Milan C; Davis, Daniel O; Mann, Jeffrey A; Bowlds, Randy A., Insulative container.
Leser, Chris K; Driskill, Philip A; Wallace, Charles T; Euler, John B; Paladino, Jason J; Maravich, Milan C; Davis, Daniel O; Mann, Jeffrey A; Bowlds, Randy A; Contrada, Svetlana I, Polymeric material for an insulated container.
Leser, Chris K; Driskill, Philip A; Wallace, Charles T; Euler, John B; Paladino, Jason J; Maravich, Milan C; Davis, Daniel O; Mann, Jeffrey A; Bowlds, Randy A; Contrada, Svetlana I; Sun, David Dezhou, Polymeric material for an insulated container.
Leser, Chris K; Wallace, Charles T; Driskill, Philip A; Euler, John B; Paladino, Jason J; Maravich, Milan C; Davis, Daniel O; Mann, Jeffrey A; Bowlds, Randy A; Contrada, Svetlana, Process for forming an insulated container having artwork.
Leser, Chris K; Wallace, Charles T; Driskill, Philip A; Euler, John B; Paladino, Jason J; Maravich, Milan C; Davis, Daniel O; Mann, Jeffrey A; Bowlds, Randy A; Contrada, Svetlana I, Process for forming an insulated container having artwork.
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