US3893382A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for manufacturing pads of bags made of synthetic thermoplastics
Assignee: Windmoeller and Hoelscher KG
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Filing: 1973-11-07
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Granted: 1975-07-08
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Expires: 1993-11-07
Abstract
Abstract In the pads to be made, the bags are joined by welding adjacent to strips which are left at the top edge of the pad when the individual bags have been torn off along respective perforation lines. These strips are provided with holes for suspending the pad. A plastics material tubing is advanced in steps corresponding to the length of the pad toward a welding and severing station, in which a bottom seam is formed, and the leading tubing section is severed in the bottom seam weld or behind the bottom seam weld, in the direction of travel of the tubing. The bag which has been severed from the tubing is stacked and is perforated at its end to be formed with an opening. That strip of the tubing which is disposed between the perforation line and the severed edge is tack-welded to the underlying strip. These operations are repeated to form a pad which consists of bags in the desired number or which has the desired height. The resulting pad is then carried away.
Inventors
- 👤 Frank Bosse
- 👤 Konrad Tetenborg
- 👤 Friedhelm Mundus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:45
CPC Classifications
B; B31; B31B; B31B70/00; B29; B29C; B29C65/00; B29C65/02; B29C65/18; B29C65/24; B29C65/30; B29C65/305; B29C65/74; B29C65/745; B29C65/7457; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/20; B29C66/23; B29C66/232; B29C66/40; B29C66/41; B29C66/43; B29C66/431; B29C66/4312; B29C66/43121; B29C66/70; B29C66/73; B29C66/739; B29C66/7392; B29C66/73921; B29C66/80; B29C66/81; B29C66/812; B29C66/8122; B29C66/814; B29C66/8145; B29C66/81457; B29C66/816; B29C66/8167; B29C66/83; B29C66/832; B29C66/8322; B29C66/83221; B29C66/84; B29C66/851; B29C66/8511; B31B70/74; B31B70/92; B31B70/98; B29C2793/00; B29C2793/0045; B29L; B29L2031/00; B29L2031/712; B29L2031/7128; B31B2155/00; B31B2155/003; B31B2160/00; B31B2160/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
183 words
Apparatus for manufacturing pads of bags made of synthetic thermoplastics, comprising a welding means and a severing means which extends over the width of the thermoplastic tubing being formed into bags and operate in step with the intermittent advance of the thermoplastic tubing through the apparatus, piercing means positioned downstream of said severing means, perforating means positioned downstream of said piercing means, and tools extending transversely to the tubing over the width thereof, said welding means comprising a welding bar, which bar is transversely disposed with respect to said tubing between said severing means and said perforating means so as to cooperate with said severing and perforating means to join the last formed bag to the preceeding formed bag, and a vertically moveable support, which support is adapted to be raised or lowered in accordance with the increasing height of the pad of bags, said support positioned so as to support bags approximately adjacent said piercing and perforating means, said support being adapted to push the pad of bags from the piercing and the perforating means when said pad has a desired height.
Claim 2
Dependent Claim
183 words
Apparatus for manufacturing pads of bags made of synthetic thermoplastics, comprising a welding means and a severing means which extends over the width of the thermoplastic tubing being formed into bags and operate in step with the intermittent advance of the thermoplastic tubing through the apparatus, piercing means positioned downstream of said severing means, perforating means positioned downstream of said piercing means, and tools extending transversely to the tubing over the width thereof, said welding means comprising a welding bar, which bar is transversely disposed with respect to said tubing between said severing means and said perforating means so as to cooperate with said severing and perforating means to join the last formed bag to the preceeding formed bag, and a vertically moveable support, which support is adapted to be raised or lowered in accordance with the increasing height of the pad of bags, said support positioned so as to support bags approximately adjacent said piercing and perforating means, said support being adapted to push the pad of bags from the piercing and the perforating means when said pad has a desired height.
Claim 3
Dependent Claim
19 words
Apparatus according to claim 1, including a stripper and a drive therefor, said stripper being mounted on said support.
Claim 4
Dependent Claim
27 words
Apparatus according to claim 1, characterized in that the support is provided at its rear end with spikes for retaining the deposited tubing sections on the support.
Claim 5
Dependent Claim
40 words
Apparatus according to claim 1 wherein the piercing and perforating means include at least one piercing sleeve and a series of perforating tools disposed below the plane of travel of the tubing and a backing means disposed above said plane.
Claim 6
Dependent Claim
27 words
Apparatus according to claim 4, further including a rubber pad, said rubber pad forming a part of the backing which engages said piercing sleeve and perforating tools.
Claim 7
Dependent Claim
16 words
Apparatus according to claim 4, further including a serrated annular cutting edge on said piercing sleeve.
Claim 8
Dependent Claim
23 words
Apparatus according to claim 4 wherein said piercing sleeve and perforating tools are stationary in the apparatus and said backing means is movable.
Claim 9
Dependent Claim
19 words
Apparatus according to claim 4 further including a tool holder foR mounting thereon said piercing sleeve and perforating tool.
References Cited (Backward Citations)
US2790591A
Cited
US3431828A
Cited
US3329260A
Cited
US3587410A
Cited
US3810420A
Cited
US3791267A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-07 | 1979-01-06 | 1979-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-07 | 1983-01-06 | 1983-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-07 | 1987-01-06 | 1987-07-08 | $7700.00 | Window Closed / Lapsed |