Lightweight bottles and method for making same

Details Lightweight bottles and method for making same Lightweight bottles and method for making same

B - Operations, Transporting

29

C

B29C 49/00 (2006.01)

Patent

CA 2287381

The present invention discloses a process comprising forming a preform with planar stretch ratios greater than about 14 from a polyester having a natural stretch ratio which is substantially matched to the preform planar stretch ratio at processing conditions; and stretch blow molding said preform to produce a container. Suitable natural stretch ratios include those greater than about 13 at 210 ~F. The desired natural stretch ratios and desirable final container properties are achieved by balancing the appropriate I.V. and copolymer modification.

La présente invention porte sur un procédé consistant à former, à partir d'un polymère, une préforme dont les rapports d'allongement planaire sont supérieurs à environ 14, ce polyester ayant un rapport d'allongement naturel correspondant pratiquement au rapport d'allongement planaire de la préforme dans les conditions de traitement; et à mouler par soufflage et allongement cette préforme de façon à former un réceptacle. Les rapports d'allongement naturel appropriés sont ceux qui sont supérieurs à environ 13 à 210 ·F. On obtient les rapports désirés d'allongement naturel et les propriétés souhaitables du réceptacle final en équilibrant la viscosité intrinsèque appropriée et la modification copolymère.

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