Method of making molecularly oriented plastic bottles

Details Method of making molecularly oriented plastic bottles Method of making molecularly oriented plastic bottles

1984-01-03

1985-06-04

Silbaugh, Jan

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Including application of internal fluid pressure to hollow...

264537, B29C 1707

Patent

active

045213690

ABSTRACT:
Mold and core rod combination for forming a plastic parison for stretch/blowing into a plastic bottle comprising a core rod with an end mated to the mold so as to permit formation of a parison with a flat on the bottom and having a sharp taper from said flat to the sidewall of the parison. The core rod is preferably shaped to include a shoulder having a substantially straight outer wall at the mouth end of the parison mold, and constructed and arranged with the mold to permit deposit of additional plastic at the inner wall of the shoulder of the parison. The design of the mated mold and core rod combination is based on the recognition that in a continuous bottle forming process a particular area of the parison can be made hotter or cooler by increasing or decreasing the thickness of that area of the parison. Parisons formed with the disclosed mold-core rod combination permit a deeper and longer stretch of the parison without tearing or deformation of the parison bottom or deformation or wrinkling at the shoulder of the finished bottle while providing essential wall strength.

REFERENCES:
patent: 2715751 (1955-08-01), Weber
patent: 2789312 (1957-04-01), Borer
patent: 3191225 (1965-06-01), Polka
patent: 3543340 (1970-12-01), Guelph
patent: 3635635 (1972-01-01), Moslo
patent: 3663143 (1972-05-01), Fischer
patent: 3986806 (1976-10-01), Bryerlein et al.

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