A pulp-molded paper lid for a beverage cup, which is made by two upper and lower mold assemblies used for a thermo-compression forming in a wet-fiber pulp-molded process, wherein, the pulp-molded paper lid comprises:
- a topside ring, formed along an outer peripheral edge of the pulp-molded paper lid and having an outermost sidewall located on one of two opposed sides of the topside ring and downwardly extended, the topside ring configured for accommodating an insertion of a convex-ridge ring around an opening of a body of the corresponding cup;
- and
- a central dominating portion, formed on an upper part of the pulp-molded paper lid and having an annular sidewall located around a central short axis of the pulp-molded paper lid, and a beverage outlet formed on the central dominating portion;
- wherein the pulp-molded paper lid further comprises:
- a generating-elasticity device, located between the annular sidewall of the central dominating portion and the topside ring, wherein along radial directions of the pulp-molded paper lid, the generating-elasticity device is respectively integrally formed with a movable bearing wall, a movable linkage wall and at least one bended end interconnecting between the movable bearing wall and the movable linkage wall to construct an angled corner having an included angle smaller than 90 degrees, which makes the entire structure of the generating-elasticity device forming a ‘V’-shaped cross section having the same function as a preloaded spring, the movable bearing wall is permanently connected to the other one of the two opposed sides of the topside ring, the movable linkage wall has a fixed end permanently connected to the annular sidewall and having an included angle relative to the annular sidewall, a first transversely cross-sectional width is defined among the movable bearing wall, the movable linkage wall and the at least one bended end and is extended along the radial directions of the pulp-molded paper lid, while the topside ring of the pulp-molded paper lid accommodates the convex-ridge ring of the corresponding cup body therein by bearing an external pressure thereon, the first transversely cross-sectional width of the generating-elasticity device is acted as pre-compressed, and the movable linkage wall is simultaneously pre-compressed to act in a rotative movement pivoted on the fixed end and to act with a stretched deformation which enlarges the included angle of the fixed end to raise the pre-compression higher for the entire structure of the generating-elasticity device, with a compressive deformation occurring therein along the radial directions of the pulp-molded paper lid, to become a second transversely cross-sectional width, and by removal of the external pressure, the generating-elasticity device is released from the pre-compression to exert preloaded elastic forces through the movable bearing wall, toward the convex-ridge ring of the corresponding cup body, along the radial directions of the pulp-molded paper lid, and the second transversely cross-sectional width becomes a third transversely cross-sectional width, wherein the generating-elasticity device exerts the preloaded elastic forces to be only one way of strengthening a clamp-retention manner that the movable bearing wall and the outermost sidewall both respectively clamp-retain two opposed sides of the convex-ridge ring of the corresponding cup body within between the movable bearing wall and the outermost sidewall, only by two planar inner sidewall surfaces which are respectively formed inside both the movable bearing wall and the outermost sidewall to clamp-retain the two opposed sides of the convex-ridge ring but to avoid formation of latch structure on either of the movable bearing wall and the outermost sidewall to snap retention with the convex-ridge ring, and wherein the third transversely cross-sectional width is smaller than each of the first transversely cross-sectional width and the second transversely cross-sectional width.