Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Including application of internal fluid pressure to hollow...
Patent
1983-07-27
1985-04-09
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...
264531, 264534, 425525, 425530, 425532, B29C 1707
Patent
active
045101167
ABSTRACT:
In blow molding an article with a reverse fold, a profiled bar is positioned where the parting line of the mold is to be when the mold is closed. The bar provides a reverse fold in the plastic article during a pre-blow step. In operation, a pre-pinched parison is formed adjacent the bar and as the mold begins to close a small amount of pre-blow air is introduced into the parison folding it against and over the bar. After the mold is closed, blow air is introduced to form the part. A complex part with good wall distribution of material can be obtained by this method.
REFERENCES:
patent: 3736201 (1973-05-01), Teraoka
Peters Donald L.
Rathman John R.
Sumpter Irvin L.
Phillips Petroleum Company
Silbaugh Jan
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