US3724340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacturing bags comprising a liner bag which protrudes from the opening
Assignee: Windmoeller and Hoelscher KG
•
Filing: 1970-11-17
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Granted: 1973-04-03
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Expires: 1990-11-17
Abstract
Abstract A method of manufacturing bags consisting of at least a single ply outside bag and a liner bag which extends at the filling end out of the outside bag. A web of material for the outside bag is divided by transverse perforations into specific outside bag lengths still attached to each other and pieces corresponding to the length of the inner bag are cutoff from a web of liner bag material. The individual liner bag pieces are placed in a sequence on the web of the outside bag material and the web of the outside bag material is wrapped around pieces of the inner bag in a tube shape. The transverse perforations are then torn into lengths of tube and the lengths of tube are fed into a bottom closing machine.
Inventors
- 👤 F Brockmueller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:32
CPC Classifications
B; B31; B31B; B31B70/00; B31B70/74; B31B70/79; B31B2155/00; B31B2160/00; B31B2160/10; B31B2170/00; B31B2170/20; B31B2170/204
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
218 words
A method of manufacturing bags consisting of at least a single ply outside bag and a liner bag, which extends at the filling end out of the outside bag, comprising the steps of dividing a web of material for the outside bag by transverse perforations into specific outside bag lengths still attached to each other, cutting off pieces corresponding to the length of the liner bag from a web of liner bag material, forming a sequence of individual liner bag pieces, placing said sequence of liner bag pieces on the previously perforated web of the outside bag material in such a way that the trailing end of the liner bag pieces overlaps a transverse perforation by the amount of extension of the liner bag out of the outside bag at the filling end, wrapping the web of outside bag material around the thus applied sequence of individual pieces of liner bag into a flat tube shape, tearing the foremost bag length from the web of outside bag material along the transverse perforations, the associated liner bag tube by this tear-off operation slipping with its trailing overlapping end out of the succeeding outside bag length and thus extending out of the torn off outside bag at the filling end and feeding the lengths of tube to a bottomclosing machine.
Claim 2
Independent Claim
218 words
A method of manufacturing bags consisting of at least a single ply outside bag and a liner bag, which extends at the filling end out of the outside bag, comprising the steps of dividing a web of material for the outside bag by transverse perforations into specific outside bag lengths still attached to each other, cutting off pieces corresponding to the length of the liner bag from a web of liner bag material, forming a sequence of individual liner bag pieces, placing said sequence of liner bag pieces on the previously perforated web of the outside bag material in such a way that the trailing end of the liner bag pieces overlaps a transverse perforation by the amount of extension of the liner bag out of the outside bag at the filling end, wrapping the web of outside bag material around the thus applied sequence of individual pieces of liner bag into a flat tube shape, tearing the foremost bag length from the web of outside bag material along the transverse perforations, the associated liner bag tube by this tear-off operation slipping with its trailing overlapping end out of the succeeding outside bag length and thus extending out of the torn off outside bag at the filling end and feeding the lengths of tube to a bottomclosing machine.
Claim 3
Dependent Claim
14 words
A method according to claim 1, wherein said bottom-closing machine is a bottom-making machine.
Claim 4
Dependent Claim
66 words
A method according to claim 1, wherein the pieces cut off from the web of liner bag material are moved over each other in direction of conveyance to such an extent that they form a sequence of individual overlapping liner bag pieces; the amount of the mutual overlap being equal to the amount by which the liner bag pieces are longer than the outer bag lengths.
Claim 5
Dependent Claim
52 words
A method according to claim 1, wherein the length of the liner bag pieces is such that their forward edges lie at a given distance behind the crosswise perforations of the web of outer bag material, as viewed in the direction of conveyance, when placed on the web of outer bag material.
Claim 6
Dependent Claim
38 words
A method according to claim 3, wherein the liner bag pieces are placed on the web of outer bag material so that their forward edges are flush with the transverse perforations of the web of outer bag material.
Claim 7
Dependent Claim
29 words
A method according to claim 1, wherein the liner bag pieces are glued at their front end to the web of outer bag material by means of glue spots.
Claim 8
Dependent Claim
14 words
A method according to claim 1, wherein the liner bag web is a tubing.
Claim 9
Dependent Claim
23 words
A method according to claim 3, wherein the liner bag pieces are closed by heat sealing at their leading edge before they overlap.
Claim 10
Dependent Claim
36 words
A method according to claim 5, wherein the wrapper bag tube is closed at its preceding end by a transverse stitched seam, said transverse stitched seam also closing the leading end of the liner bag tube.
Claim 11
Dependent Claim
51 words
A method according to claim 1, wherein the liner bag web consists of a simple sheeting web which is formed into the liner bag tube in conjunction with the formation for the wrapper bag tube, with longitudinal and transverse seams being formed therein by adhering during the formation of the tube.
Claim 12
Dependent Claim
12 words
A method according to claim 10, wherein the adhering is heat sealing.
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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |