Corrugated paper cup

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.