Forming molecularly oriented containers from reheated preforms

Details Forming molecularly oriented containers from reheated preforms Forming molecularly oriented containers from reheated preforms

B - Operations, Transporting

65

D

190/150, 190/26.

B65D 1/02 (2006.01)

Patent

CA 1139248

402 APPLICATION FOR LETTERS PATENT FOR IMPROVEMENTS IN FORMING MOLECULARLY ORIENTED CONTAINERS FROM REHEATED PREFORMS ABSTRACT OF THE DISCLOSURE In forming containers from injection molded preforms of thermo- plastic material such as nitrile-based polymers by a process which includes heating the preforms to orientation temperature followed by distension to container form in a mold, the improvement providing re- duced thickness variability in lower portions of the containers which in- volves controlling preform shrinkage during such heating to between about 4 to 15% of the initial length for nitrile materials by maintaining the ratio of average thickness to inside preform surface area within de- fined limits and then axially and radially stretching such preforms during distension to predetermined levels. Nitrile preforms convertible to such improved quality containers have values of between about 0.005 to 0.011 inch-1 for the aforementioned ratio. Inventors: Purushottam D. Agrawal John E. Griesing

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