US3721602A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for applying heat-sealed seams to at least two-ply composite material of which the confronting plies
Assignee: Windmoeller and Hoelscher KG
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Filing: 1971-02-02
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Granted: 1973-03-20
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Expires: 1991-02-02
Abstract
Abstract The invention relates to an apparatus for applying heat-sealed seams to at least two-ply composite material of which the confronting plies are heat-sealable at the operating temperature and the plies facing heat-sealing jaws are adapted to transmit the sealing heat without changing their structure. Such material is primarily used in machines for making hermetically sealed bags so that the humidity and aroma of the contents remain unaffected by the atmosphere. The inner ply of the bag can be a thermoplastic material while the ply which later forms the outside of the bag is either a non-thermoplastic carrier material such as aluminum foil or paper or a plastics material which has a higher melting point than the inner ply.
Inventors
- 👤 F Bosse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:44
CPC Classifications
B; B29; B29C; B29C65/00; B29C65/02; B29C65/18; B29C65/24; B29C65/30; B29C65/305; B29C66/00; B29C66/004; B29C66/0042; B29C66/0044; B29C66/00441; B29C66/40; B29C66/41; B29C66/43; B29C66/80; B29C66/81; B29C66/812; B29C66/8122; B29C66/816; B29C66/8167; B29C66/818; B29C66/8182; B29C66/81821; B29C66/82; B29C66/824; B29C66/8242; B29C66/83; B29C66/832; B29C66/8322; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/431; B29C66/432; B29C66/4322; B29C66/814; B29C66/8141; B29C66/81411; B29C66/81415; B29C66/81419
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
93 words
Apparatus having sealing jaws each of said sealing jaws being equipped with a flexible sealing bar, each of the said sealing bars being heated by a heating element of rod form, said heating elements being inserted into the pertaining sealing bar, the apparatus comprising an elastic layer to compensate for differences in the thickness of the plies of material to be sealed between the sealing jaws along the intended heat seal, the elastic layer being disposed between the sealing bar of one of said sealing jaws and support means for that sealing bar.
Claim 2
Dependent Claim
93 words
Apparatus having sealing jaws each of said sealing jaws being equipped with a flexible sealing bar, each of the said sealing bars being heated by a heating element of rod form, said heating elements being inserted into the pertaining sealing bar, the apparatus comprising an elastic layer to compensate for differences in the thickness of the plies of material to be sealed between the sealing jaws along the intended heat seal, the elastic layer being disposed between the sealing bar of one of said sealing jaws and support means for that sealing bar.
Claim 3
Dependent Claim
61 words
Apparatus according to claim 1 wherein the jaw carrying the elastic layer is fixed to a frame and the other jaw is movable by a plurality of hydraulic or pneumatic pistons having piston rods which, by means of pivot pins extend transversely to the length of the jaws, are hinged to supporting members for the said other jaw extending longitudinally thereof.
Claim 4
Dependent Claim
23 words
Apparatus according to claim 1, wherein the said support means comprise a base bar, a thermally insulating intermediate layer and an intermediate bar.
Claim 5
Dependent Claim
58 words
Apparatus according to claim 1, wherein the sealing bar comprises a portion having a cross-section which converges towards its sealing surface and the sealing bar is held to its support means by metal sheathing fixed to the support means, the sheathing embracing the converging portion of the sealing bar so that the heating surface projects beyond the sheathing.
Claim 6
Dependent Claim
22 words
Apparatus according to claim 4, wherein each end of the sheathing comprises a tab engaging around the ends of the sealing bar.
Claim 7
Dependent Claim
10 words
Apparatus according to claim 5, wherein the tabs are resilient.
Claim 8
Dependent Claim
15 words
Apparatus according to claim 4, wherein the sheathing is provided with a thermally insulating lining.
Claim 9
Dependent Claim
18 words
Apparatus according to claim 1, wherein said heating element of rod form is moulded into the sealing bar.
Claim 10
Dependent Claim
29 words
Apparatus according to claim 1, wherein said a heating element of rod form is inserted in a groove of the sealing bar and covered by an accurately fitting plate.
Claim 11
Dependent Claim
30 words
Apparatus accordinG to claim 1, wherein the heating surface of the sealing bar is covered by a non-stick film wound on rotatable shafts along each side of said one jaw.
Claim 12
Dependent Claim
11 words
Apparatus according to claim 10, wherein the non-stick film comprises polytetrafluoroethylene.
Claim 13
Dependent Claim
40 words
Apparatus according to claim 5, wherein the supporting members are associated with pressers, one of the supporting members being held to its associated presser against displacement whilst the others are slidable with respect to their pressers lengthwise of the jaws.
Claim 14
Dependent Claim
17 words
Apparatus according to claim 12, wherein the supporting members are held to the pressers by tension springs.
Claim 15
Dependent Claim
36 words
Apparatus according to claim 12, wherein there are at least three supporting members for the said other jaw, the pressers associated with the outer supporting members being provided with guide grooves for the respective supporting members.
Claim 16
Dependent Claim
26 words
Apparatus according to claim 5, wherein the supporting members are provided with ribs which extend transversely of the jaws and lie against the said other jaw.
Claim 17
Dependent Claim
21 words
Apparatus according to claim 5, wherein the said other jaw and means for moving same are mounted on a pivotable beam.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |