Patent ID: 7507195

Claim:
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.