Patent US4066727A successfully refreshed from Google Patents.
US4066727A
Expired / Lapsed
US
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Method for continuous stretch-blow molding
Assignee: Monsanto Co
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Filing: 1976-06-14
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Granted: 1978-01-03
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Expires: 1996-06-14
Abstract
Abstract Method for continuously forming molecularly oriented articles using a multi-station rotary stretch-blow molding machine wherein a plurality of partible blow molds angularly spaced about a continuously rotating support are provided with means for moving the mold sections of said molds between open and closed positions in synchronization with rotation of said support, additional means to longitudinally reciprocate a stretch rod within a cavity of each of said molds and further means for projecting the rod into the cavity and retracting it therefrom, said rod moving means being operable in combination and in synchronization with said mold movements. Another feature involves continuously and simultaneously feeding workpieces to and discharging articles from a stretch-blow mold machine. The workpiece, while at molecular orientation temperature, is held temporarily or stored at each moving mold while an article is being formed in the cavity of such mold from a prior preform.
Inventors
- 👤 Joseph R. Reilly
- 👤 Leonard J. Witkowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:49
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/08; B29C49/10; B29C49/12; B29C49/28; B29C49/30; B29C49/36; B29C49/42; B29C49/4205; B29C49/42073; B29C49/4236
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
115 words
In the process of blow molding articles from preforms which includes the steps of: positioning such preforms within cavities of continuously moving blow molds; distending such preforms within the moving molds to form the articles; and discharging the articles from the still-moving molds at an eject station prior to charging with additional preforms; the improvement in said process which comprises: holding a preform temporarily at and moving with each such moving mold while an article is being formed in the cavity of such mold from a prior preform; and charging said preform directly to said mold during or after discharge of an article formed from a prior preform from such mold at the eject station.
Claim 2
Dependent Claim
115 words
In the process of blow molding articles from preforms which includes the steps of: positioning such preforms within cavities of continuously moving blow molds; distending such preforms within the moving molds to form the articles; and discharging the articles from the still-moving molds at an eject station prior to charging with additional preforms; the improvement in said process which comprises: holding a preform temporarily at and moving with each such moving mold while an article is being formed in the cavity of such mold from a prior preform; and charging said preform directly to said mold during or after discharge of an article formed from a prior preform from such mold at the eject station.
Claim 3
Dependent Claim
16 words
The process of claim 1 wherein the preform is at orientation temperature during such holding step.
Claim 4
Dependent Claim
18 words
The process of claim 1 wherein distending occurs first in the longitudinal and then in the radial direction.
Claim 5
Dependent Claim
126 words
In the process of blow molding molecularly oriented containers from molded preforms at orientation temperature which includes the steps of: positioning such preforms within cavities of continuously moving blow molds; distending such preforms within the moving molds to form the articles; and discharging the articles from the still-moving molds at an eject station prior to charging with additional preforms; the improvement in said process which comprises: loading individual preforms at a charging station into holders adjacent to and moving with such molds while articles are being formed within such molds from prior preforms; and charging said preforms while at molecular orientation temperature directly to said molds from such holders during or after discharge of articles formed from prior preforms from such molds at the eject station.
Claim 6
Dependent Claim
126 words
In the process of blow molding molecularly oriented containers from molded preforms at orientation temperature which includes the steps of: positioning such preforms within cavities of continuously moving blow molds; distending such preforms within the moving molds to form the articles; and discharging the articles from the still-moving molds at an eject station prior to charging with additional preforms; the improvement in said process which comprises: loading individual preforms at a charging station into holders adjacent to and moving with such molds while articles are being formed within such molds from prior preforms; and charging said preforms while at molecular orientation temperature directly to said molds from such holders during or after discharge of articles formed from prior preforms from such molds at the eject station.
Claim 7
Dependent Claim
25 words
The process of claim 4 wherein the prior formed article is being discharged fom the mold during charging of such mold with the next preform.
Claim 8
Dependent Claim
28 words
The process of claim 4 wherein the charging step is carried out by dropping a preform onto a rod extending upwardly on the axis of the mold cavity.
Claim 9
Dependent Claim
19 words
The process of claim 4 wherein said molds traverse a closed circular path during one cycle of the system.
References Cited (Backward Citations)
US3850562A
Cited
US3936521A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-02 | 1981-07-04 | 1982-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-02 | 1985-07-04 | 1986-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-02 | 1989-07-04 | 1990-01-03 | $7700.00 | Window Closed / Lapsed |