Forming Structure for Internal Snap Ring of Pulp Molded Cup Lid

Abstract

A forming structure for the internal snap ring of a pulp molded cup lid is disclosed. When manufacturing the pulp molded cup lid, the pulp suction mold sucks a pulp layer and sends it to a hot press upper mold for clamping and squeezing to shape the pulp layer into a primary blank, meanwhile producing an internal snap ring part on the primary blank. After subsequent hot pressing and shaping, the finished product of a pulp molded cup lid will have an integral internal snap ring structure. Comparing with the prior art, the present invention omits a second operation (processing), and the preparation of a mold for the second operation (processing). Therefore, the present invention can save manufacturing cost and time.

What is claimed: 
     
         1 . A forming structure for an internal snap ring of a pulp molded cup lid, wherein the pulp molded cup lid is formed by an automatic forming machine for manufacturing pulp molding products, the automatic forming machine for manufacturing pulp molding products has a pulp suction forming zone and a hot press shaping zone, the pulp suction forming zone is provided with a pulp box and a pulp suction mold in a working space, the pulp box is filled with pulp, the pulp suction mold can rise and fall inside the working space, the hot press shaping zone is provided with a hot press upper mold and a hot press lower mold inside a working space, the hot press upper mold is provided at an upper position inside the working space, and can be pushed to move transversely, the mold surface of the hot press upper mold faces downward, the hot press lower mold is provided beneath the hot press upper mold, and can be pushed to move upward and downward, the surface of the hot press lower mold faces upward, the pulp suction mold sucks pulp from inside the pulp box to form a pulp layer, and moves upward while sucking the pulp layer to leave the pulp box, the hot press upper mold moves toward the middle position and stops above the pulp suction mold, then, the pulp suction mold moves upward to clamp with the hot press upper mold to squeeze the pulp layer, so that the pulp layer is hardened and formed into a primary blank, then, the pulp suction mold leaves the primary blank and moves downward, the hot press upper mold sucks the primary blank to move transversely to reset, then, the hot press lower mold moves upward to clamp with the hot press upper mold to press and shape the primary blank, so that the primary blank is hardened and formed into a pulp molded cup lid, characteristically, the outer edge on the lateral surface of the hot press upper mold is configured with a ring groove, when the pulp suction mold rises and clamps with the hot press upper mold to squeeze the pulp layer, due to the squeezing, part of the pulp will enter the groove and is left there, so that the pulp layer will produce an integral internal snap ring, together with the pulp layer, the internal snap ring is squeezed and formed into part of the primary blank, and after hot pressing and shaping, it becomes part of the pulp molded cup lid.