US3789888A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas flushing system for vertical form, fill and seal machines
Assignee: Hayssen Manufacturing Co
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Filing: 1971-09-27
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Granted: 1974-02-05
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Expires: 1991-09-27
Abstract
Abstract Gas flushing is effected by introducing the gas through one or more ducts into a free portion of the vertical package forming, filling and sealing tube above the area to which packaging sheet material is fed onto and tubularly formed about the tube. At least one of the ducts communicates with an extension duct nozzle depending within the tube for releasing and distributing flushing gas onto the product delivered through the tube into the form packaging bags. Pre-purging gas may be introduced into the tube upstream from the flusihing gas. Gas sampling and machine startup pre-flushing may be effected through a duct having a combination inlet and outlet located to extend partially downwardly into the bag to be filled or which may have been last filled when the machine is restarted after a shut-down.
Inventors
- 👤 R James
- 👤 D Wilson
- 👤 F Pringle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:54
CPC Classifications
B; B65; B65B; B65B31/00; B65B31/04; B65B31/044; B65B31/045; B65B55/00; B65B55/02; B65B55/12; B65B55/19; B65B9/00; B65B9/10; B65B9/20; B65B9/213
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
81 words
In combination in means for gas flushing a prod-uct and including a delivering tube of a package forming and filling machine and in which the tube has a product entry end and a product delivery end: means for supplying flushing gas into said tube from adjacent to said entry end to drive air from the tube and replace the air with said flushing gas; and additional means for supplying initial purging gas at a position near one of said tube ends.
Claim 2
Dependent Claim
81 words
In combination in means for gas flushing a prod-uct and including a delivering tube of a package forming and filling machine and in which the tube has a product entry end and a product delivery end: means for supplying flushing gas into said tube from adjacent to said entry end to drive air from the tube and replace the air with said flushing gas; and additional means for supplying initial purging gas at a position near one of said tube ends.
Claim 3
Dependent Claim
22 words
A combination according to claim 1, in which said initial purging gas means are located near the delivery end of the tube.
Claim 4
Dependent Claim
27 words
A combination according to claim 1, including means for withdrawing sample of the atmosphere created by the gas flushing from adjacent the delivery end of said tube.
Claim 5
Dependent Claim
36 words
A combination according to claim 1, wherein said means for supplying initial purging gas are located near said product entry end of the tube, and additional means operative to introduce preflushing gas near said delivery end.
Claim 6
Dependent Claim
31 words
A combination according to claim 1, including means alternatively operable to secure a sample of gas for analysis adjacent to the delivery end of said tube and for introducing preflushing gas.
Claim 7
Independent Claim
56 words
A method of gas flushing in a bag forming, filling and sealing machine including a tube having a product entry end and product delivery end comprising: gas flushing the interior of said tube to control the atmosphere therein for the product; and also pre-purging by supplying the gas to said tube near one of its ends.
Claim 8
Independent Claim
56 words
A method of gas flushing in a bag forming, filling and sealing machine including a tube having a product entry end and product delivery end comprising: gas flushing the interior of said tube to control the atmosphere therein for the product; and also pre-purging by supplying the gas to said tube near one of its ends.
Claim 9
Dependent Claim
13 words
A method according to claim 6, including sampling said atmosphere for gas analysis.
Claim 10
Dependent Claim
25 words
A method according to claim 6, including effecting said pre-purging by introducing gas to preflush and precondition said atmoshphere downstream relative to said gas flushing.
Claim 11
Dependent Claim
25 words
A method according to claim 6, including effecting said pre-purging by introducing gas to preflush and precondition said atmosphere upstream relative to said gas flushing.
Claim 12
Independent Claim
70 words
A method of flushing a package forming tube in a machine wherein product is delivered through the tube to a bag at one end of the tube and wherein the machine is subject to shut-down, comprising: during running of the machine and filling of bags flushing the interior of said tube to create a predetermined gaseous atmosphere; and after a shut-down pre-purging said tube interior incidental to restarting the machine.
Claim 13
Independent Claim
70 words
A method of flushing a package forming tube in a machine wherein product is delivered through the tube to a bag at one end of the tube and wherein the machine is subject to shut-down, comprising: during running of the machine and filling of bags flushing the interior of said tube to create a predetermined gaseous atmosphere; and after a shut-down pre-purging said tube interior incidental to restarting the machine.
References Cited (Backward Citations)
US3653414A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |