Preparation of molecularly oriented containers using reheat...

Details Preparation of molecularly oriented containers using reheat... Preparation of molecularly oriented containers using reheat...

B - Operations, Transporting

29

C

18/1171

B29C 17/07 (1980.01)

Patent

CA 1087827

APPLICATION FOR LETTERS PATENT FOR PREPARATION OF MOLECULARLY ORIENTED CONTAINERS USING REHEAT PROCESS ABSTRACT OF THE DISCLOSURE Molecularly oriented containers are formed from molded preforms made of an amorphous thermoplastic resin and having a finish neck tubular portion and a body portion which method includes subjecting the preform body to a thermoforming orienting step while at a temperature at which substantial molecular orientation occurs, said temperature being arrived at by first overheating the outside of said preform body using external heating means to an average outside temperature greater than the substantial molecular orientation temperature range thereby creating a temperature gradient across the thickness of said preform body and then cooling said heated preform body until the average outside temperature is within said substantial molecular orientation temperature range and the entire preform body is at a temperature within said sub- stantial molecular orientation temperature range and whereas said temperature gradient is significantly reduced. Inventor: Thomas J. Stolki - 1 -

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