US3930790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for shrinking plastic film over grouped articles
Assignee: Tredegar Corp
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Filing: 1971-04-08
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Granted: 1976-01-06
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Expires: 1991-04-08
Abstract
Abstract A process and apparatus for shrinking plastic film over grouped articles. The apparatus includes a frame having a base and upstanding support members. A heater assembly is movably attached to the upstanding support members and is adapted to be passed over a group of products surrounded by a biaxially or preferentially oriented plastic film capable of being heat shrunk. The heater assembly carries one or more flameless, fuel gas powered, infrared heating units.
Inventors
- 👤 John E. Rogosch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:16
CPC Classifications
B; B65; B65B; B65B53/00; B65B53/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
168 words
In an apparatus for shrinking plastic film around an article or group of articles, the combination comprising: a. a support frame having a base and a substantially vertical support member; b. a heater assembly mounted on said vertical support member for up and down movement; c. heater means including at least one flameless fuel gas infrared heater unit mounted on said heater assembly to direct heat inwardly, said heater unit emitting more than fifty percent of its energy as infrared energy having a wavelength of from about two to about six microns and generating temperatures in the range of from about 700°F to about 1,000°F; and d. power means mounted on said support frame and coupled to said heater assembly for moving said heater assembly up and down said power means including a double-acting, solely fluid powered assembly mounted vertically on said support frame and having a length equal to or greater than the length of the path traversed by said heater assembly during up and down movement.
Claim 2
Dependent Claim
168 words
In an apparatus for shrinking plastic film around an article or group of articles, the combination comprising: a. a support frame having a base and a substantially vertical support member; b. a heater assembly mounted on said vertical support member for up and down movement; c. heater means including at least one flameless fuel gas infrared heater unit mounted on said heater assembly to direct heat inwardly, said heater unit emitting more than fifty percent of its energy as infrared energy having a wavelength of from about two to about six microns and generating temperatures in the range of from about 700°F to about 1,000°F; and d. power means mounted on said support frame and coupled to said heater assembly for moving said heater assembly up and down said power means including a double-acting, solely fluid powered assembly mounted vertically on said support frame and having a length equal to or greater than the length of the path traversed by said heater assembly during up and down movement.
Claim 3
Dependent Claim
33 words
In the apparatus of claim 1 wherein said double-acting, fluid-powered assembly includes a pneumatically powered piston received in a cylinder, said piston having flexible connector means coupling said piston to said heater assembly.
Claim 4
Dependent Claim
63 words
In the apparatus of claim 2 wherein said support frame includes a pair of spaced apart, substantially vertically extending support members and said double-acting, fluid-powered assembly is mounted between said pair of vertically extending support members and has one end attached to said base and the other end attached to the upper ends of said support members by means of a cross brace.
References Cited (Backward Citations)
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Cited
US3581458A
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US3514920A
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Cited
US3508375A
Cited
US3589102A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-05 | 1979-07-07 | 1980-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-05 | 1983-07-07 | 1984-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-05 | 1987-07-07 | 1988-01-06 | $7700.00 | Window Closed / Lapsed |