Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Including application of internal fluid pressure to hollow...
Patent
1983-05-18
1985-10-29
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...
264529, 264536, 264130, 264159, 425 97, 425527, B29C 1712, B29C 1707
Patent
active
045500088
ABSTRACT:
A method and apparatus for molding plastic products of virtually any complicated configuration is provided. When a parison is extruded out of a nozzle, a separating agent, preferably oil, is supplied into the parison as a lubricant. Since a thin film of the separating agent is formed on the inside surface of the parison, portions of the inside surface do not stick together even if they are brought into contact from some reasons. This insures to mold a plastic product of a very complex configuration. Use of a separating agent also allows to form sheet-type products by dividing the parison into several sections as desired. This is a very efficient way of forming sheet-type products since at least two may be formed at the same time.
REFERENCES:
patent: 3162707 (1964-12-01), Scott, Jr. et al.
patent: 3183288 (1965-05-01), Taylor et al.
patent: 3579622 (1971-05-01), Shaw et al.
patent: 3859408 (1975-01-01), Voss et al.
patent: 4113814 (1978-09-01), Kojimoto et al.
Excell Corporation
Silbaugh Jan
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