US3793115A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for shaping and welding plastic sheet material for packaging articles
Assignee: Individual
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Filing: 1971-11-22
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Granted: 1974-02-19
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Expires: 1991-11-22
Abstract
Abstract Method and means for forming superposed sheets of thermo-plastic material, as for packaging articles. Superposed sheets are sealed along spaced coextending lines of juncture defining an intermediate area of the material exposed within a closed chamber, and thereby dividing the chamber into inlet and outlet compartments. Heated gaseous medium under pressure within inlet compartment generates void in said intermediate area, initially by penetrating the same, to form severed edge portions which shrink away from each other and form heat-sealed welds contiguous with said spaced lines of juncture. Gaseous medium entering outlet compartment is conducted therefrom in manner to remove all traces of plastic residue from the closed chamber.
Inventors
- 👤 T Jindra
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:22
CPC Classifications
B; B29; B29C; B29C65/00; B29C65/02; B29C65/10; B29C65/74; B29C65/747; B29C65/7471; B29C66/00; B29C66/002; B29C66/01; B29C66/05; B29C66/10; B29C66/13; B29C66/137; B29C66/20; B29C66/24; B29C66/242; B29C66/2422; B29C66/24221; B29C66/40; B29C66/41; B29C66/43; B29C66/70; B29C66/73; B29C66/739; B29C66/7392; B29C66/73921; B29C66/80; B29C66/81; B29C66/814; B29C66/8141; B29C66/81427; B29C66/818; B29C66/8182; B29C66/81821; B29C66/84; B29C66/849; B65; B65B; B65B51/00; B65B51/10; B65B51/20; B29C66/83; B29C66/832; B29C66/8322; B29L; B29L2031/00; B29L2031/712; B29L2031/7128
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
179 words
Apparatus for forming superposed layers of thermo-plastic sheet material to have joined edges of given configurations, comprising: a matrix having relatively movable mating parts provided with spaced pairs of clamping means for defining a closed cavity of given extent and configuration, in a closed condition of said mating parts for said spaced pairs of clamping means in said closed condition of said mating parts being adapted to grip the superposed layers to be sealed along spaced lines of joinder thereof coextensive with said given configuration, whereby the gripped material initially divides said cavity into separate coextending compartments; inlet passage means in one said matrix section communicating with the cavity compartment thereof, and outlet passage means in the other said matrix section communicating with the cavity compartment of the same; and means for connecting said inlet passage with a supply of heated gaseous medium adapted, upon contact with said gripped thermo-plastic sheet material, to generate a void therein to expose joined edges adjacent said spaced lines and to fuse and seal the thereby exposed joined edges of superposed layers together.
Claim 2
Dependent Claim
179 words
Apparatus for forming superposed layers of thermo-plastic sheet material to have joined edges of given configurations, comprising: a matrix having relatively movable mating parts provided with spaced pairs of clamping means for defining a closed cavity of given extent and configuration, in a closed condition of said mating parts for said spaced pairs of clamping means in said closed condition of said mating parts being adapted to grip the superposed layers to be sealed along spaced lines of joinder thereof coextensive with said given configuration, whereby the gripped material initially divides said cavity into separate coextending compartments; inlet passage means in one said matrix section communicating with the cavity compartment thereof, and outlet passage means in the other said matrix section communicating with the cavity compartment of the same; and means for connecting said inlet passage with a supply of heated gaseous medium adapted, upon contact with said gripped thermo-plastic sheet material, to generate a void therein to expose joined edges adjacent said spaced lines and to fuse and seal the thereby exposed joined edges of superposed layers together.
Claim 3
Dependent Claim
15 words
Apparatus as in claim 1, wherein said clamping means includes spaced pairs of heat-resistent jaws.
Claim 4
Dependent Claim
39 words
Apparatus as in claim 2, wherein grippinG edges on one said pair of heat resistent gripping jaws have configuration adapted for welding sealed peripheral edge portions of a plastic container formed in said superposed layers of the sheet material.
Claim 5
Dependent Claim
52 words
Apparatus as in claim 3, wherein said matrix has by-pass means of lesser flow area than that of said inlet passage, adapted to discharge ambient air from said inlet compartment upon initial entry of the heated gaseous medium toward welding contact with thermo-plastic sheet material held between said pairs of gripping jaws.
Claim 6
Dependent Claim
43 words
Apparatus as in claim 1, wherein said matrix is provided with by-pass means of lesser flow capacity than that of said inlet passage, adapted to discharge ambient gaseous medium from said inlet compartment upon initial entry of heated gaseous medium into the same.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |