Structure of a one-piece paper container and the manufacturing process thereof

A manufacturing process of a one-piece paper container, comprising

• a) providing a single-layer coated paper formed by having a PE coating film coated on a first surface of a base paper and leaving a second surface of the base paper exposed;
• b) cutting and pressing said single-layer coated paper into an unfolded container base with a container body and a cover;
• c) providing a steam room for the cut unfolded container base to be disposed therein, for the second surface of the base paper to absorb the steam and therefore soften the container base;
• d) providing a thermoforming equipment to form the prototype of the container body, the cover, and a plurality of coincided surfaces at four corners to coincide and shape the container base;
• e) providing an upper mold and a lower mold having depression surfaces with a pre-determined depth for thermoforming at 120° C.˜160° C. and fusing the coating film on the coincided surfaces with heat to combine with each other;
• f) holding control of the period for thermoforming so that when the container body and the cover are shaped, an enhanced surface with a plurality of protrusions would form on each of the surfaces thereof;
• and
• g) shaping the one-piece paper container and measuring the moisture thereof to decide if it is qualified.