Abstract: The present invention relates to an easy-open vessel lid which is composed of a laminate of a metal foil and a resin and has opening weakened line. A reinforcing layer of a thermoplastic resin is formed independently from the resin of the laminate at least on the outer peripheral side of a part most protruding in the opening-initiating direction of an inside introducing weakened line to cover said weakened line astride of said weakened line. By this reinforcing layer, ribbon breaking can be effectively prevented, and opening by shearing of the lid member along the weakened lines can be performed assuredly and smoothly.

Abstract: A method of making a heat-resistant paper container which comprises a bottomed seamless press-molded body comprising a laminate of a paper substrate having an elongation of at least 1.5% in the longitudinal direction and an elongation of at least 4.5% in the lateral direction and a coating layer of a hiding pigment formed on both the surfaces of the paper substrate, wherein the amount coated of the hiding pigment is 1 to 50 g/m.sup.2, the binder in the coating layer is a thermosetting resin binder and the binder is present in the coating layer at a weight ratio R.sub.P satisfying the following condition:R.sub.P =k.multidot.O.sub.A .multidot.d.sub.Rwherein O.sub.A stands for the oil absorption (ml/100 g) of the hiding pigment, d.sub.A stands for the density (g/ml) of the binder, and k is a number of from 0.005 to 0.2.

Abstract: Disclosed is a heat-resistant paper container which comprises a bottomed seamless press-molded body comprising a laminate of a paper substrate having an elongation of at least 1.5% in the longitudinal direction and an elongation of at least 4.5% in the lateral direction and a coating layer of a hiding pigment formed on both the surfaces of the paper substrate, wherein the amount coated of the hiding pigment is 1 to 50 g/m.sup.2, the binder in the coating layer is a thermosetting resin binder and the binder is present in the coating layer at a weight ratio R.sub.P satisfying the following conditions:R.sub.P =k.multidot.O.sub.A .multidot.d.sub.R (1)wherein O.sub.A stands for the oil absorption (ml/100 g) of the hiding pigment, d.sub.A stands for the density (g/ml) of the binder, and k is a number of from 0.005 to 0.2.