US3953272A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for end sealing a bag and apparatus therefor
Assignee: Whitehall Machinery Ltd
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Filing: 1974-05-15
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Granted: 1976-04-27
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Expires: 1994-05-15
Abstract
Abstract Superimposed heat-sealable layers are heat-sealed by applying external suction to draw the layers apart, inserting a nozzle between the parted layers, directing hot gas from the nozzle onto the inside surfaces of the layers, removing the nozzle and pressing the heated surfaces together. Preferably the layers are carried by a conveyor, such as between a pair of endless chains, along a path on which the suction means, nozzle means and pressing means are successively arranged.
Inventors
- 👤 Geoffrey Terence Webber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:23
CPC Classifications
B; B65; B65B; B65B51/00; B65B51/10; B65B51/20; B29; B29C; B29C65/00; B29C65/02; B29C65/10; B29C65/103; B29C65/78; B29C65/7841; B29C65/7847; B29C65/7858; B29C65/7861; B29C65/787; B29C65/7873; B29C65/7888; B29C65/7894; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/40; B29C66/41; B29C66/43; B29C66/431; B29C66/4312; B29C66/43121; B29C66/80; B29C66/83; B29C66/834; B29C66/8341; B29C66/83411; B29C66/83413; B29C66/84; B29C66/849; B29C66/87; B29C66/874; B29L; B29L2031/00; B29L2031/712; B29L2031/7128; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1036
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
196 words
Apparatus for continuous heat-sealing the mouths of sacks, comprising means for transporting the sacks along a path with opposite sides of each sack at the mouth drawn together in superimposed relationship, suction means located on either side of the path for drawing the sides of the sack apart at the mouth, nozzle means located in the region of said suction means and arranged for movement into and out of the open mouth of each passing sack to direct heated gas therefrom onto the inner surfaces of the sack in the region to be heat-sealed, and means located on the path beyond the nozzle means for pressing the thus heated sides of the bag together at the mouth to effect the heat-seal between the two sides, the nozzle means having nozzle openings forwardly and rearwardly in the direction of travel of the sack such that, in operation, heated gas from the forward nozzle openings is directed into the leading fold of the sack as the nozzle enters the mouth, and heated gas from the rearward nozzle openings is directed into the trailing fold of the sack as the nozzle is removed from the mouth of the sack.
Claim 2
Dependent Claim
196 words
Apparatus for continuous heat-sealing the mouths of sacks, comprising means for transporting the sacks along a path with opposite sides of each sack at the mouth drawn together in superimposed relationship, suction means located on either side of the path for drawing the sides of the sack apart at the mouth, nozzle means located in the region of said suction means and arranged for movement into and out of the open mouth of each passing sack to direct heated gas therefrom onto the inner surfaces of the sack in the region to be heat-sealed, and means located on the path beyond the nozzle means for pressing the thus heated sides of the bag together at the mouth to effect the heat-seal between the two sides, the nozzle means having nozzle openings forwardly and rearwardly in the direction of travel of the sack such that, in operation, heated gas from the forward nozzle openings is directed into the leading fold of the sack as the nozzle enters the mouth, and heated gas from the rearward nozzle openings is directed into the trailing fold of the sack as the nozzle is removed from the mouth of the sack.
Claim 3
Dependent Claim
167 words
Apparatus for continuous heat-sealing the mouths of sacks, comprising means for transporting the sacks along a path with opposite sides of each sack at the mouth drawn together in superimposed relationship to each other, suction means located at either side of the path adapted to draw the sides of the sack apart at the mouth, nozzle means located in the region of said suction means and arranged for relative movement into and out of the open mouth of each passing sack to direct heated gas therefrom onto the inner surfaces of the sack in the region to be heat-sealed, lateral support means arranged on either side of the path to locate the sides of the sack mouth in closely spaced relationship to the sides of the nozzle when the nozzle is positioned in the sack mouth, and means located on the path beyond the nozzle means for pressing the sides of the bag thus heated together at the mouth to effect the heat-seal between the two sides.
Claim 4
Dependent Claim
167 words
Apparatus for continuous heat-sealing the mouths of sacks, comprising means for transporting the sacks along a path with opposite sides of each sack at the mouth drawn together in superimposed relationship to each other, suction means located at either side of the path adapted to draw the sides of the sack apart at the mouth, nozzle means located in the region of said suction means and arranged for relative movement into and out of the open mouth of each passing sack to direct heated gas therefrom onto the inner surfaces of the sack in the region to be heat-sealed, lateral support means arranged on either side of the path to locate the sides of the sack mouth in closely spaced relationship to the sides of the nozzle when the nozzle is positioned in the sack mouth, and means located on the path beyond the nozzle means for pressing the sides of the bag thus heated together at the mouth to effect the heat-seal between the two sides.
Claim 5
Dependent Claim
78 words
Apparatus according to claim 2 wherein the nozzle means has nozzle openings forwardly and rearwardly with respect to the direction of travel of the sack such that the heated gas from the forward nozzle openings is directed into the leading fold of the sack as the nozzle enters the mouth, and heated gas from the rearward nozzle openings is directed into the trailing fold of the sack as the nozzle is removed from the mouth of the sack.
Claim 6
Dependent Claim
31 words
Apparatus according to claim 1 wherein the nozzle means comprises a nozzle rotatably mounted for movement into and out of the mouth of the sack as it moves along said path.
Claim 7
Dependent Claim
61 words
Apparatus according to claim 1 wherein the nozzle comprises apertured leading and trailing portions for directing hot gas forwardly and rearwardly with respect to the direction of travel of the sack, and an apertured intermediate portion to which suction is simultaneously applied to remove gas, and particulate matter, if present, from the heat seal region in the mouth of the sack.
Claim 8
Dependent Claim
140 words
A continuous method for heat sealing the mouths of sacks comprising the steps of: transporting each sack along a path with opposite sides at the mouth of each sack drawn together in superimposed relationship, the mouth having a leading fold, sides and a trailing fold; drawing the sides of the sack apart at the mouth by suction means located on either side of the path; moving a nozzle into and then out of the open mouth of the sack in passing, and directing heated gas from the nozzle into the leading fold of the sack mouth as the nozzle enters, onto the sides of the sack mouth while the nozzle remains stationary therein, and then into the trailing fold of the sack mouth as the nozzle is removed therefrom; and pressing the thus heated surfaces together to effect the heat-seal.
Claim 9
Dependent Claim
140 words
A continuous method for heat sealing the mouths of sacks comprising the steps of: transporting each sack along a path with opposite sides at the mouth of each sack drawn together in superimposed relationship, the mouth having a leading fold, sides and a trailing fold; drawing the sides of the sack apart at the mouth by suction means located on either side of the path; moving a nozzle into and then out of the open mouth of the sack in passing, and directing heated gas from the nozzle into the leading fold of the sack mouth as the nozzle enters, onto the sides of the sack mouth while the nozzle remains stationary therein, and then into the trailing fold of the sack mouth as the nozzle is removed therefrom; and pressing the thus heated surfaces together to effect the heat-seal.
Claim 10
Dependent Claim
35 words
A method according to claim 6 wherein the sides of the sack mouth are externally supported in closely spaced relationship to the sides of the nozzle when the nozzle is stationary within the sack mouth.
References Cited (Backward Citations)
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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) | 1979-04-27 | 1979-10-27 | 1980-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-27 | 1983-10-27 | 1984-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-27 | 1987-10-27 | 1988-04-27 | $7700.00 | Window Closed / Lapsed |