Curled-Edge and Double-Layered Cup, and Method of Manufacturing the Same

A method for manufacturing a curled-edge and double-layered cup, the method comprising:

• manufacturing an outer cup unit, the outer cup unit including an outer base wall, an outer surrounding wall that extends upwardly from an outer periphery of the outer base wall, and an annular outer top wall that extends outwardly from a top end of the outer surrounding wall by a first length;
• manufacturing an inner cup unit, the inner cup unit including an inner base wall, an inner surrounding wall that extends upwardly from an outer periphery of the inner base wall, an annular inner top wall that extends outwardly from a top end of the inner surrounding wall by a second length larger than the first length, and an outmost surrounding wall that extends downwardly from an outer periphery of the inner top wall;
• inserting the inner cup unit into the outer cup unit, such that the inner base wall is disposed above the outer base wall, the outer surrounding wall surrounds the inner surrounding wall, the inner top wall is disposed above the outer top wall, and the outmost surrounding wall surrounds the outer top wall;
• and
• curling the outmost surrounding wall of the inner cup unit, wherein the outmost surrounding wall has a surrounding portion that is connected to an outer periphery of the inner top wall and that surrounds an outer periphery of the outer top wall, and a bottom seal portion that extends inwardly from a lower end of the surrounding portion and that is disposed under the outer top wall, and wherein the inner top wall, the surrounding portion and the bottom seal portion cooperatively constitute a curled-edge unit that encloses the outer top wall of the outer cup unit.