Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Plural sequential shaping or molding steps on same workpiece
Patent
1976-04-15
1978-06-27
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Plural sequential shaping or molding steps on same workpiece
264 97, 264 98, 264322, 425525, 425392, B29C 1702, B29C 1707
Patent
active
040975703
ABSTRACT:
A method for molding an end portion of a tubular thermoplastic parison prior to a blow molding operation to form a parison finish and an annular support flange. The method includes closing a laterally movable, sectional mold onto a circumferential section of a parison so that at least one end portion of the parison extends out of the mold. The extending end portion of the parison is then thermally conditioned to a deformable temperature and thereafter the parison is axially displaced to telescopically insert the thermally conditioned end portion within the mold into general radial alignment with annular, longitudinally spaced finish and support flange cavities. Next, an internal support is telescopically inserted within the thermally conditioned parison portion in preparation for the compression molding steps; which include axially displacing the opposed ends of the parison to force thermally conditioned, deformable plastic parison material radially outwardly into the flange and finish cavities.
REFERENCES:
patent: 2347101 (1944-04-01), Harding
patent: 2876496 (1959-03-01), Murphy, Jr.
patent: 3949045 (1976-04-01), Hess et al.
patent: 3969060 (1976-07-01), Rosenkranz et al.
Dickson Andrew C.
Kontz Robert F.
Click Myron E.
Heberling Richard D.
Owens--Illinois, Inc.
Silbaugh Jan H.
Wilson David H.
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