Corrugated paper cup

1 . A corrugated paper cup, comprising:

a cup body formed by rolling a fan-shaped sheet, the fan-shaped sheet having a first edge, a second edge, an upper arc edge and a lower arc edge, and the fan-shaped sheet comprising only two layers of paper, wherein the only two layers of paper are respectively inner cup paper and single-layer corrugated paper adhered to an outer peripheral surface of the inner cup paper; wherein

a first end of the single-layer corrugated paper is staggered with and parallel to a first end of the inner cup paper to form the first edge and a second end of the single-layer corrugated paper is flush with a second end of the inner cup paper to form the second edge of the fan-shaped sheet;

a thickness of the inner cup paper is greater than that of the single-layer corrugated paper;

a corrugated strip of the fan-shaped sheet unfolded is a transverse stripe in a direction from the first edge to the second edge; a corrugation of the single-layer corrugated paper is a straight stripe, and the straight stripe is in a direction perpendicular to the first edge;

when the fan-shaped sheet is rolled to form the cup body, the second edge and the first edge of the fan-shaped sheet are laminated to form a seam region;

the inner cup paper has an adhering portion which is not covered by the single-layer corrugated paper, when the second end of the inner cup paper is adhered to an outer side surface of the first end of the single-layer corrugated paper, the seam region comprises a four-layer reinforced structure formed by the second end of the single-layer corrugated paper, the second end of the inner cup paper, the first end of the single-layer corrugated paper and the inner cup paper adjacent the adhering portion, and a three-layer water-tight structure formed by the second end of the single-layer corrugated paper, the second end of the inner cup paper and the adhering portion; and

a region of the fan-shaped sheet close to the upper arc edge is flattened to form an upper rim rolling region and a thickness of the upper rim rolling region is smaller than that of a middle part of the fan-shaped sheet and a part of the upper rim rolling region is rolled outwardly to form a rolled rim.

2 . The corrugated paper cup according to claim 1 , wherein an upper end of the single-layer corrugated paper close to the upper arc edge is flush with an upper end of the inner cup paper close to the upper arc edge, a lower end of the single-layer corrugated paper close to the lower arc edge is flush with a lower end of the inner cup paper close to the lower arc edge; a region of the fan-shaped sheet close to the lower arc edge is flattened to form a lower folding region and a thickness of the lower folding region is smaller than that of the middle part of the fan-shaped sheet, and a part of the lower folding region is folded inwardly to form a cup pedestal.

3 . The corrugated paper cup according to claim 2 , wherein after the region of the fan-shaped sheet close to the upper arc edge or/and the lower arc edge is flattened, folds are formed on the upper rim rolling region or/and the lower folding region, and the folds are rolled into the rolled rim or/and folded into the cup pedestal.

4 . The corrugated paper cup according to claim 1 , wherein a waterproof layer is arranged on an inner wall of the inner cup paper, and when the adhering portion is overlapped by an inner side surface of the second end of the inner cup paper to form a sealed adhesive connection, one end of the waterproof layer is connected with a main body of the waterproof layer.

5 . The corrugated paper cup according to claim 4 , wherein the paper cup further comprises a cup bottom, an adhering layer is arranged on the cup bottom, a region of the fan-shaped sheet close to the lower arc edge is flattened to form a lower folding region, an end portion of the folding region is folded inwardly to form a folding layer, and the adhering layer is hermetically adhered between the lower folding region and the folding layer.