Patent ID: 8701917

Claim:
An opening device for straws of a liquid food container which comprises a bottom and a main body formed with a packaging material laminated on both sides of a paper substrate with thermoplastic resin, and a top formed with thermoplastic resin and joined to an upper end of the main body; an opening of the opening device for straws is integrally formed with the top and comprises a plurality of steps and level differences on a front side and a back side of the opening, the level differences on the front side and the level differences on the back side are formed at edges of the level differences of the back side and the front side with overlaps, lengths of the overlaps of the edges of the level differences are thinner than thickness of the steps, the level differences are easy fracture parts, a projection is located on the front side of one of the steps and projects away from the front side of the one step, the steps have 190%-650% of thickness to the lengths of the overlaps of the edges, and the overlap of the edge is 0.09-0.11 millimeter in length.