Abstract: 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.

Abstract: A retort cup including 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. A bottom portion seals one of the openings of the barrel portion and 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 is formed at a lower end of the barrel portion and an upper fold-back portion 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. The peripheral edge portion is inserted into the lower fold-back portion.

Abstract: A heat insulating cup comprises a cup body and a protective cover. The cup body has side wall and a bottom wall. The protective cover is adhered to the cup body to cover the entire outer circumferential region of the side wall. The upper end portion of the side wall is folded outward along the open upper circumferential edge of the cup body to form a flange portion. The protective cover comprises an embossed paper sheet having a dotted pattern of embossed points and a paper liner board adhered to the embossed paper sheet. The embossed paper sheet has a basis weight of 50 to 180 g/m.sup.2, with the liner board having a basis weight of 180 to 270 g/m.sup.2. A laminate structure prepared by adhering the liner board to the embossed paper sheet is die-cut to prepare a blank of the protective cover. The blank is adhered to the side wall of the cup body such that the both side end regions of the wound blank are arranged opposite each other.