Method of strengthening neck portion of bottle-shaped...

Details Method of strengthening neck portion of bottle-shaped... Method of strengthening neck portion of bottle-shaped...

B - Operations, Transporting

29

C

18/540

B29C 25/00 (1980.01)

Patent

CA 1182963

ABSTRACT OF THE DISCLOSURE A method of strengthening the neck portion of a bottle- shaped container of polyethylene terephthalate resin which has the steps of heating the neck portion at approx. 140 to 170°C, then inserting a cylindrical die pin having an outer diameter slightly smaller than the bore of the neck portion and cooling function, and blowing chilled air to the neck portion, thereby gradually cooling the neck portion to whiten the neck portion. Thus, the neck portion of the bottle-shaped container is strengthened. However, it can effectively prevent the produc- tion of incorrect contraction deformation of the neck portion due to the thermal influence of the heat applied from the exterior. -1-

415740

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