Method for manufacturing paper container

A method for manufacturing a paper container, including:

• preparing a paper material;
• applying a covering layer to at least one surface of the paper material to form a base material, wherein a material of the covering layer is selected from a group including acrylic acid;
• cutting the base material to form a first sheet and a second sheet;
• bending and connecting the first sheet to form a barrel body;
• and
• connecting the second sheet with the barrel body by ultrasonic heating and pressing, wherein the barrel body is circumferentially disposed around the second sheet, and surfaces of the barrel body and the second sheet facing each other respectively have the covering layer applied thereto;
• said covering layers located between the barrel body and the second sheet are at least partially fused together by ultrasonic heating, while the barrel body and the second sheet are being embossed and pressed together;
• wherein a difference between a glass transition temperature (Tg) and a melting temperature (Tm) of the material of the covering layer is less than or equal to 20° C.