Japanese Patent JPH0434925

B2

PURPOSE:To effectively orientate a shoulder part and at the same time prevent lens effect from developing by a shape wherein the connecting part of a shell part with a neck part is tapered in thickness so as to become gradually thinner from the shell part to the neck part and has a form, in which the stress per unit area during orientation becomes gradually larger from the shell part to the neck part. CONSTITUTION:An open end for sealing 4, a thread for engagement with a cap 5 and a supporting ring 6 are equipped at the neck part 1 of a preform and at the same time a round closed bottom part 7 is provided at its lowermost end. As for the neck part and a shell part 2, the inner peripheral surface at the shell part 9 is smaller than the inner peripheral surface at the neck part 8 and the outer peripheral surface at the shell part 11 is smaller than the outer peripheral surface at the neck part 10. In addition, the thickness of the neck part 1 is larger than that of the shell part 2. Further, the curvature of an inner surface 12 at a connecting part 3 is made larger than that of an outer surface 13 so as to taper the thickness from the shell part to the neck part in order to contrive to uniformize the orientation at the shoulder of a container.

MYAZAKI SHINICHI

JP16770585A

June 09, 1992

July 31, 1985

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TOYO SEIKAN KAISHA LTD

B29B11/08; B29C49/00; B29C49/06; B29C49/08; B29L22/00

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