B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/509
B29C 49/08 (2006.01)
Patent
CA 1139067
C-16-71-041 IMPROVEMENTS IN FORMING NON-CYLINDRICAL ARTICLES FROM PREEORMS OF POLYALKYLENE TEREPHTHALATE ABSTRACT OF THE DISCLOSURE In forming hollow, molecularly oriented articles having a substantially oval or substantially equilateral triangular cross section from thermoplastic preforms by method which includes distending the preforms in a mold while at molecular orientation temperature, the improve- ment providing improved material distribution in regions furthest from the axes of the articles when the thermoplastic is moldable polyalkylene terephthalate having an inherent viscosity of at least 0.55 which involves limiting the corner definition ratio to between about 3 to about 9 and the circular deviation ratio to no greater than about 2.4 at the cross section during distension and controlling axial and maximum radial stretch of the preforms within pre- determined limits.
342268
Mcfadden Fincham
Monsanto Company
LandOfFree
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