CONTAINER MADE OF RESIN

摘要

PROBLEM TO BE SOLVED: To ensure hermetical sealability without causing crack and damage of a container and to enable easy, sure heat sterilization by inclining a face being in contact with a cap on an opening so that it becomes lower from its inner perimetral edge to an outer perimetral edge and also specifying the angle of the inclination at the inner perimetral edge. SOLUTION: The internal wall of the opening of a bottle 31 which is covered with a cap comprising a sealing material 32 is formed in such a shape that when the bottle is hermetically sealed, the internal wall and the cap are in contact with each other at an angleθ1 of 90 to 135 deg.. In the case of an angleθ1 of less than 90 deg., air bubbles tend to accumulate on a line 34 where the internal face 33 and cap are in contact with each other, with the result that a portion which is difficult to transfer heat applied during heat sterilization occurs. Also, a face 35 being in contact with the cap on the opening is so inclined as to become lower from its inner perimetral edge 36 to outer perimetral edge 37. Further, the angleθ2 of the inclination of the face 35 being in contact with the cap on the opening to the inner perimetral edge 36 is set 0 deg. or more to less than 35 deg.. Here, the angleθ2 of the inclination of the face 35 to the inner perimetral edge is an angle formed by the face 35 and the face 38 of the opening at the inner perimetral edge 36.