US4147748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Displacement blow-molding
Assignee: General Electric Co
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Filing: 1976-07-23
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Granted: 1979-04-03
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Expires: 1996-07-23
Abstract
Abstract Apparatus and method for forming hollow articles from plasticized materials are disclosed. A preform is partially formed under substantially no pressure on a preform core by introducing the core into a void-free charge of plasticized material that is placed in a preform cavity from a source of the plasticized material. After the preform core and preform cavity have moved together to define a preform mold space, the charge of plasticized material is subjected to a pressure forming step to form a completely packed preform on the core. The preform is then blow-molded in a blow cavity by introducing blowing gas into the preform through the preform core. Neck mold structure that strips and releases the formed article from the core is also disclosed.
Inventors
- 👤 Robert W. Saumsiegle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:10
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/32; B29C43/36; B29C49/00; B29C49/02; B29C49/06; B29C49/061; B29C49/064; B29C2049/023; B29L; B29L2001/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
243 words
A method for forming a hollow article from plasticized material comprising depositing a charge of plasticized material into a preform cavity by locating an orifice for delivery of the plasticized material near the bottom of the preform cavity, commencing the delivery of plasticized material from the delivery orifice while the orifice is near the bottom of the preform cavity, delivering plasticized material from the orifice as relative separation between the orifice and the bottom of the cavity is effected to deposit a substantially void-free, substantially symmetrical charge in the preform cavity and in receiving means in communication with the preform cavity, effecting relative withdrawal of the delivery orifice from the preform cavity, predetermining and establishing a desired distance relationship between the delivery orifice and the level of the charge of plasticized material during delivery thereof to the preform cavity, effecting relative telescopic movement of the preform cavity and a preform core to displace the charge of plasticized material in the preform cavity, thereby forming an unpacked preform on the preform core, forming a substantially closed mold space defined at least in part by the preform core and preform cavity before the charge of plasticized material is fully displaced, packing the unpacked preform by displacing plasticized material from the receiving means into the preform mold space, effecting relative separation of the preform cavity and preform core while maintaining the preform in blow-moldable condition, and thereafter blow molding the preform to form the hollow article.
Claim 2
Independent Claim
243 words
A method for forming a hollow article from plasticized material comprising depositing a charge of plasticized material into a preform cavity by locating an orifice for delivery of the plasticized material near the bottom of the preform cavity, commencing the delivery of plasticized material from the delivery orifice while the orifice is near the bottom of the preform cavity, delivering plasticized material from the orifice as relative separation between the orifice and the bottom of the cavity is effected to deposit a substantially void-free, substantially symmetrical charge in the preform cavity and in receiving means in communication with the preform cavity, effecting relative withdrawal of the delivery orifice from the preform cavity, predetermining and establishing a desired distance relationship between the delivery orifice and the level of the charge of plasticized material during delivery thereof to the preform cavity, effecting relative telescopic movement of the preform cavity and a preform core to displace the charge of plasticized material in the preform cavity, thereby forming an unpacked preform on the preform core, forming a substantially closed mold space defined at least in part by the preform core and preform cavity before the charge of plasticized material is fully displaced, packing the unpacked preform by displacing plasticized material from the receiving means into the preform mold space, effecting relative separation of the preform cavity and preform core while maintaining the preform in blow-moldable condition, and thereafter blow molding the preform to form the hollow article.
Claim 3
Independent Claim
251 words
A method for forming a hollow article from plasticized material comprising depositing a charge of plasticized material into a preform cavity by locating an orifice for delivery of the plasticized material near the bottom of the preform cavity, commencing the delivery of plasticized material from the delivery orifice while the orifice is near the bottom of the preform cavity, delivering plasticized material from the orifice as relative separation between the orifice and the bottom of the cavity is effected to deposit a substantially void-free and substantially symmetrically shaped charge in the preform cavity, predetermining and establishing a desired distance relationship between the delivery orifice and the level of the charge of plasticized material during delivery thereof to the preform cavity, effecting receipt of a quantity of plasticized material in receiving means in communication with the preform cavity, effecting relative withdrawal of the delivery orifice from the preform cavity, introducing the preform core into the preform cavity to displace the charge of plasticized material in the preform cavity and form an unpacked preform on the preform core, forming a closed preform mold space defined at least in part by the preform core and preform cavity before the charge of plasticized material is fully displaced by the core, packing the unpacked preform by displacing plasticized material from the receiving means into the preform mold space, effecting relative separation of the preform cavity and preform core while maintaining the preform in blow-moldable condition, and thereafter blow molding the preform to form the hollow article.
Claim 4
Independent Claim
251 words
A method for forming a hollow article from plasticized material comprising depositing a charge of plasticized material into a preform cavity by locating an orifice for delivery of the plasticized material near the bottom of the preform cavity, commencing the delivery of plasticized material from the delivery orifice while the orifice is near the bottom of the preform cavity, delivering plasticized material from the orifice as relative separation between the orifice and the bottom of the cavity is effected to deposit a substantially void-free and substantially symmetrically shaped charge in the preform cavity, predetermining and establishing a desired distance relationship between the delivery orifice and the level of the charge of plasticized material during delivery thereof to the preform cavity, effecting receipt of a quantity of plasticized material in receiving means in communication with the preform cavity, effecting relative withdrawal of the delivery orifice from the preform cavity, introducing the preform core into the preform cavity to displace the charge of plasticized material in the preform cavity and form an unpacked preform on the preform core, forming a closed preform mold space defined at least in part by the preform core and preform cavity before the charge of plasticized material is fully displaced by the core, packing the unpacked preform by displacing plasticized material from the receiving means into the preform mold space, effecting relative separation of the preform cavity and preform core while maintaining the preform in blow-moldable condition, and thereafter blow molding the preform to form the hollow article.
Claim 5
Dependent Claim
23 words
A method as in claim 2 wherein the delivery orifice feeds a portion of the charge of plasticized material into the receiving means.
Claim 6
Dependent Claim
31 words
A method as in claim 2 wherein the quantity of plasticized material received in the receiving means comprises a portion of the charge that is deposited into the preform mold cavity.
References Cited (Backward Citations)
US1945255A
Cited
US2313110A
Cited
US2981976A
Cited
US3166025A
Cited
US3337910A
Cited
US3375553A
Cited
US3670066A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-02 | 1982-10-02 | 1983-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-02 | 1986-10-02 | 1987-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-02 | 1990-10-02 | 1991-04-03 | $7700.00 | Window Closed / Lapsed |