| US 7,507,195 B2 | ||
| Method of manufacturing a food container | ||
| Shinkichi Hamano, Tokyo (Japan) | ||
| Assigned to Isamu Sato, Tokyo (Japan) | ||
| Filed on Jun. 27, 2007, as Appl. No. 11/823,282. | ||
| Application 11/823282 is a continuation in part of application No. 11/472682, filed on Jun. 22, 2006, abandoned. | ||
| Claims priority of application No. 2005-183903 (JP), filed on Jun. 23, 2005. | ||
| Prior Publication US 2008/0045392 A1, Feb. 21, 2008 | ||
| Int. Cl. B31B 1/62 (2006.01) | ||
| U.S. Cl. 493—141 [493/148; 493/162; 428/34.02; 428/35.6] | 17 Claims |
| 1. A method of manufacturing a food container or covers, comprising:
forming a board of a predetermined size from a material including at least one of pulp or vegetable fiber material other than
pulp;
coating one surface of the paperboard article with thermoplastic resin having a heat sealing property;
forming substantially V-shaped foldout pieces each for connecting an adjacent pair of sidewall pieces at a respective one
of four corners of the paperboard article; and
forming the food container or cover by hot-pressing the paperboard article between a pair of male and female press dies;
wherein one pair of the sidewall pieces opposed to each other is configured to be erected ahead of a remaining pair of the
sidewall pieces opposed to each other; and
wherein each of the V-shaped foldout pieces includes a V-shaped foldout portion shorter than other portions of the paperboard
article that are adjacent to both sides of the foldout piece, and at least a portion of the V-shaped foldout piece is overlapped
or stuck to at least one of an adjacent one side of the V-shaped foldout piece or one of the sidewall pieces.
|