US3944643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for manufacturing shaped articles by injection-blow molding
Assignee: Nissei Plastic Industrial Co Ltd
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Filing: 1973-08-09
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Granted: 1976-03-16
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Expires: 1993-08-09
Abstract
Abstract A method for manufacturing shaped articles by injection-blow molding. A thermoplastic material is first formed into a bottomed parison by injection-molding said material onto the surface of an injection molding core. The bottomed parison formed on the surface of the core is cooled to a temperature at which it is easily removed from the core, and is removed therefrom. The parison is heated again to a predetermined temperature and the reheated parison is transferred to a blow molding mold, wherein the parison is blow-molded.
Inventors
- 👤 Wasuke Sato
- 👤 Fumio Iriko
- 👤 Yoshihiko Yuzawa
- 👤 Setsuyuki Takeuchi
- 👤 Nobukuni Ibe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:55
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/02; B29C49/06; B29C49/0005; B29C49/061; B29C49/062; B29C49/08; B29C49/10; B29C49/12; B29C49/42; B29C49/64; B29C49/6409; B29C2049/023; B29C2949/00; B29C2949/20; B29C2949/22; B29C2949/24; B29C2949/26; B29C2949/28; B29C2949/30; B29C2949/3024; B29C2949/3032; B29C49/4205; B29C49/42073; B29C49/42087
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
159 words
A method for manufacturing shaped articles by injection blow molding comprising injection-molding a thermo-plastic material onto the surface of an injection molding core to form a bottomed parison; cooling the parison to a temperature at which it is easily removed from said core; removing the cooled parison from said core and transferring the cooled parison to a reheating mold; reheating the removed parison to a predetermined temperature; transferring the reheated parison to a blow molding mold; stretching longitudinally the reheated parison disposed within the blow-molding mold by extending a stretching rod downwards within the parison; and blow-molding said parison; characterized in that said reheating is performed in a manner that the stretching rod is disposed in contact with the inside bottom of the parison, so that the stretching rod is heated to much the same temperature as the parison and so that in the stretching step, the parison portion contacted with the stretching rod is prevented from being destroyed.
Claim 2
Independent Claim
159 words
A method for manufacturing shaped articles by injection blow molding comprising injection-molding a thermo-plastic material onto the surface of an injection molding core to form a bottomed parison; cooling the parison to a temperature at which it is easily removed from said core; removing the cooled parison from said core and transferring the cooled parison to a reheating mold; reheating the removed parison to a predetermined temperature; transferring the reheated parison to a blow molding mold; stretching longitudinally the reheated parison disposed within the blow-molding mold by extending a stretching rod downwards within the parison; and blow-molding said parison; characterized in that said reheating is performed in a manner that the stretching rod is disposed in contact with the inside bottom of the parison, so that the stretching rod is heated to much the same temperature as the parison and so that in the stretching step, the parison portion contacted with the stretching rod is prevented from being destroyed.
Claim 3
Dependent Claim
16 words
A method according to claim 1 characterized in that the temperature of said rod is regulated.
Claim 4
Dependent Claim
45 words
A method according to claim 1 characterized in that said stretching rod is temperature-controlled to keep that portion of the stretching rod contacted with the end portion of the parison at the temperature not higher than nor 20° C lower than that of the parison.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-16 | 1979-09-15 | 1980-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-16 | 1983-09-15 | 1984-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-16 | 1987-09-15 | 1988-03-16 | $7700.00 | Window Closed / Lapsed |