US3666905A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for dielectric heating
Assignee: Paul Troester MaschinenfabriK
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Filing: 1970-04-24
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Granted: 1972-05-30
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Expires: 1990-04-24
Abstract
Abstract A method and apparatus for heating plastics or rubber articles of complex shape in which the articles are moved on a conveyor belt through a hollow waveguide excited with a microwave energy flow or field acting in one direction. A sinuous hollow waveguide perpendicularly communicates and intersects with the first waveguide at a plurality of spaced apart intervals and is excited with the microwave energy flow acting in a direction perpendicular to the first direction. The articles are thus exposed alternately to staggered energy flows acting perpendicularly of one another, whereby to improve the efficiency of heating and avoid local hot spots.
Inventors
- 👤 Paul C Muller
- 👤 Karl H Schneider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:17
CPC Classifications
B; B29; B29B; B29B13/00; B29B13/02; B29B13/023; B29C; B29C35/00; B29C35/02; B29C35/08; B29C35/10; B29C35/0805; B29C2035/0855; B29C35/04; B29C35/045; B29L; B29L2031/00; B29L2031/001; B29L2031/003
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
126 words
Apparatus for the continuous dielectric heating of articles of plastics, rubber or like materials, said apparatus comprising a hollow waveguide, conveyor means extending longitudinally within said waveguide, means for moving said conveyor within said waveguide to move articles to be heated through said waveguide, at least two further waveguides communicating at an angle with said first mentioned hollow waveguide, wherein each of said further waveguides has an end portion parallel and adjacent the end portion of the other waveguide, a relatively movable connection waveguide interconnecting said two further waveguides, said relatively movable waveguide being U-shaped and telescopically received on said parallel and adjacent end portions, and means for exciting said waveguides with microwave energy to provide spaced energy flows therein at an angle to one another.
Claim 2
Dependent Claim
126 words
Apparatus for the continuous dielectric heating of articles of plastics, rubber or like materials, said apparatus comprising a hollow waveguide, conveyor means extending longitudinally within said waveguide, means for moving said conveyor within said waveguide to move articles to be heated through said waveguide, at least two further waveguides communicating at an angle with said first mentioned hollow waveguide, wherein each of said further waveguides has an end portion parallel and adjacent the end portion of the other waveguide, a relatively movable connection waveguide interconnecting said two further waveguides, said relatively movable waveguide being U-shaped and telescopically received on said parallel and adjacent end portions, and means for exciting said waveguides with microwave energy to provide spaced energy flows therein at an angle to one another.
Claim 3
Dependent Claim
28 words
Apparatus according to claim 1 wherein said further waveguide is sinuous in shape and communicates and intersects with said first waveguide at two or more spaced apart locations.
Claim 4
Dependent Claim
35 words
Apparatus according to claim 1 wherein said exciting means comprises a magnetron, and means displaceably mounting said magnetron and said movable connecting waveguide, whereby to permit adjustment in the relative excitation on the two waveguides.
Claim 5
Dependent Claim
24 words
Apparatus according to claim 1 including a resonant chamber, and means coupling said resonant chamber in said first hollow waveguide intermediate the ends thereof.
Claim 6
Dependent Claim
27 words
Apparatus according to claim 1 wherein said conveyor comprises a conveyor belt, said conveyor belt being supported and guided in said waveguide on vertically adjustable supporting rollers.
Claim 7
Dependent Claim
24 words
Apparatus according to claim 1 including a tap line communicating with said resonant chamber and means for supplying protective gas to said tap line.
Claim 8
Independent Claim
113 words
A method for the continuous dielectric heating of articles of plastics, rubber or like material by the use of microwave energy comprising: a. Providing at least two waveguides intersecting one another so that microwave energy flowing there through is angularly related at such areas of intersection, b. generating such microwave energy from a single microwave energy source associated with one of said waveguides so as to expose an article to be heated successively to at least two spaced apart even flows of microwave energy, and c. adjustably controlling the degree of excitation of said single microwave energy source thereby to provide even heat treatment irrespective of the type of article to be heated.
Claim 9
Independent Claim
113 words
A method for the continuous dielectric heating of articles of plastics, rubber or like material by the use of microwave energy comprising: a. Providing at least two waveguides intersecting one another so that microwave energy flowing there through is angularly related at such areas of intersection, b. generating such microwave energy from a single microwave energy source associated with one of said waveguides so as to expose an article to be heated successively to at least two spaced apart even flows of microwave energy, and c. adjustably controlling the degree of excitation of said single microwave energy source thereby to provide even heat treatment irrespective of the type of article to be heated.
Claim 10
Dependent Claim
32 words
The method of claim 7 wherein the articles are exposed to a plurality of said flows of microwave energy, alternate flows acting at one angle and the remaining flows at another angle.
Claim 11
Dependent Claim
24 words
The method of claim 7 wherein said two flows of microwave energy act at an angle of between 45* and 90* to one another.
Claim 12
Dependent Claim
39 words
The method of claim 7 further including the steps of moving the article to be heated in a predetermined path, said spaced apart flows of energy acting respectively substantially longitudinally of said path and substantially transversely of said path.
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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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |