Pulp molded cup lid and manufacturing method therefor

A pulp molded cup lid, comprising:

• a lid top portion (10);
• a transverse extension portion (20), connected to a lower side of an outer edge of the lid top portion (10) and extending radially outward;
• and
• a longitudinal extension portion (30), connected to an outer edge of the transverse extension portion (20) and extending axially downward, wherein the longitudinal extension portion (30) is cylindrical;
• wherein the pulp molded cup lid further comprises:
• at least one inner convex buckle (40) disposed on an inner wall of the longitudinal extension portion (30), the at least one inner convex buckle (40) and the longitudinal extension portion (30) are integrated into a single-piece structure, and the at least one inner convex buckle (40) protrudes inward relative to the inner wall of the longitudinal extension portion (30);
• and an outer wall of the longitudinal extension portion (30) defines a rolling groove (50), and the rolling groove (50) is configured to further reduce an inner diameter of each of the at least one inner convex buckle (40);
• and
• wherein a spacing (L1) between a groove bottom of the rolling groove (50) and an inner convex top of each of the at least one inner convex buckle (40) is greater than a thickness (H) of a single side wall of the longitudinal extension portion (30).