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 straight edge, a second inclined edge, an upper arc edge and a lower arc edge, and the fan-shaped sheet comprising 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 straight 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 inclined edge of the fan-shaped sheet;
• a corrugated strip of the fan-shaped sheet unfolded is a transverse stripe in a direction from the first straight edge to the second inclined edge;
• when the fan-shaped sheet is rolled to form the cup body, the second inclined edge and the first straight edge of the fan-shaped sheet are laminated to form a seam region in which at least three layers of papers are adhered;
• and
• a corrugated cavity region of the fan-shaped sheet close to the upper arc edge is flattened to form a first extruded corrugated cavity region and a thickness of the first extruded corrugated cavity region is smaller than that of a middle part of the fan-shaped sheet and a part of the first extruded corrugated cavity region is rolled outwardly together with the inner cup paper to form a rolled rim.