US4599847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal cut-off device for packaging machine
Assignee: EXACT EQUIPMENT Corp
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Filing: 1985-01-31
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Granted: 1986-07-15
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Expires: 2005-01-31
Abstract
Abstract In wrapping machinery for wrapping articles in heat sealable plastic film, a web of film is drawn from a supply roll and is severed by pulling the film under tension downwardly onto the narrow edge of a thermal cut-off device, which may be a heated rod or blade, to melt the film material along a thin transverse line and to permit severance thereof by pulling. Following severance of the film, the film-wrapped package is sealed by placing the package on a pedestal hot plate. The temperature of the hot plate is higher than that of the thermal cut-off device used to sever the film. The hot plate is supplied by electrical energy from a single source through a temperature sensor and control. The thermal cut-off device obtains its heat by conduction from the hot plate.
Inventors
- 👤 Arthur L. Reenstra
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:16
CPC Classifications
B; B65; B65B; B65B67/00; B65B67/08; B65B67/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
163 words
In wrapping machinery having a supply of heat-sealable plastic film for wrapping articles therein to form a sealed package: a. a heat-conductor thermal cut-off conductor for severing the film from the film supply; b. a hot-plate unit for sealing the package, said unit having a top hot plate; c. a source of electric power for supplying electric current to said hot plate for heating the hot plate to a film-sealing non-burning temperature of the order of 300°-325° F.; and d. combination heat-conductive transfer means and thermal cut-off mounting means, coupling said hot plate in heat-conductive relation to said thermal cut-off conductor solely by said combination means to a film-softening non-burning temperature which is lower than said film-sealing temperature and which is of the order of 260°-285° F., and mounting said thermal cut-off to be carried directly by said hot-plate unit, whereby the heat transfer between the hot plate and the thermal cut-off takes place in a direct conductive path through the mounting means.
Claim 2
Dependent Claim
163 words
In wrapping machinery having a supply of heat-sealable plastic film for wrapping articles therein to form a sealed package: a. a heat-conductor thermal cut-off conductor for severing the film from the film supply; b. a hot-plate unit for sealing the package, said unit having a top hot plate; c. a source of electric power for supplying electric current to said hot plate for heating the hot plate to a film-sealing non-burning temperature of the order of 300°-325° F.; and d. combination heat-conductive transfer means and thermal cut-off mounting means, coupling said hot plate in heat-conductive relation to said thermal cut-off conductor solely by said combination means to a film-softening non-burning temperature which is lower than said film-sealing temperature and which is of the order of 260°-285° F., and mounting said thermal cut-off to be carried directly by said hot-plate unit, whereby the heat transfer between the hot plate and the thermal cut-off takes place in a direct conductive path through the mounting means.
Claim 3
Dependent Claim
14 words
Apparatus according to claim 1 wherein said thermal cut-off conductor is a copper rod.
Claim 4
Dependent Claim
14 words
Apparatus according to claim 1 wherein said thermal cut-off conductor is a copper blade.
Claim 5
Dependent Claim
28 words
Apparatus according to claim 1 wherein said combination heat-conductive transfer and thermal cut-off mounting means is an aluminum plate connecting said hot plate to said thermal cut-off conductor.
Claim 6
Dependent Claim
27 words
Apparatus according to claim 2 wherein said combination heat-conductive transfer and thermal cut-off mounting means is an aluminum plate connecting said hot plate to said copper blade.
Claim 7
Dependent Claim
27 words
Apparatus according to claim 3 wherein said combination heat-conductive transfer and thermal cut-off mounting means is an aluminum plate connecting said hot plate to said copper blade.
Claim 8
Dependent Claim
17 words
Apparatus according to claim 4 wherein said aluminum plate is the rear plate of the hot-plate unit.
Claim 9
Dependent Claim
17 words
Apparatus according to claim 5 wherein the aluminum plate is the rear plate of the hot-plate unit.
Claim 10
Dependent Claim
17 words
Apparatus according to claim 6 wherein the aluminum plate is the rear plate of the hot-plate unit.
Claim 11
Dependent Claim
18 words
The apparatus of claim 1, wherein said source of electric power includes a temperature sensor and temperature control.
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) | 1989-07-14 | 1990-01-13 | 1990-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-14 | 1994-01-13 | 1994-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-14 | 1998-01-13 | 1998-07-15 | $7700.00 | Window Closed / Lapsed |