GB1192320A - Improvements in or relating to Microwave Driers - Google Patents

Improvements in or relating to Microwave Driers

Info

Publication number
GB1192320A
GB1192320A GB57151/68A GB5715168A GB1192320A GB 1192320 A GB1192320 A GB 1192320A GB 57151/68 A GB57151/68 A GB 57151/68A GB 5715168 A GB5715168 A GB 5715168A GB 1192320 A GB1192320 A GB 1192320A
Authority
GB
United Kingdom
Prior art keywords
plates
waveguide
lossy
halves
web
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB57151/68A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bechtel International Corp
Original Assignee
Bechtel International Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bechtel International Corp filed Critical Bechtel International Corp
Publication of GB1192320A publication Critical patent/GB1192320A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/78—Arrangements for continuous movement of material
    • H05B6/788—Arrangements for continuous movement of material wherein an elongated material is moved by applying a mechanical tension to it
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2206/00—Aspects relating to heating by electric, magnetic, or electromagnetic fields covered by group H05B6/00
    • H05B2206/04—Heating using microwaves
    • H05B2206/046—Microwave drying of wood, ink, food, ceramic, sintering of ceramic, clothes, hair

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Drying Of Solid Materials (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

1,192,320. Microwave heating. BECHTEL INTERNATIONAL CORP. 2 Dec., 1968 [6 Dec., 1967], No. 57151/68. Heading H5H. [Also in Division F4] A split waveguide through which a web 7 to be dried is passed in the direction of the arrow has a pair of plates 23 of lossy R.F. material positioned between the waveguide halves 9 and 11, the plates 23 being positioned on either side of the axial slot formed between the halves 9 and 11 and extending the length of the slot to prevent leakage therefrom. Further "lossy" plates 41, 43 are provided at the entry and exit to the slot to minimize leakage from these points. Suitable lossy materials are mixtures of iron particles and carbon, carborundum, or ceramics. The plates 23 have wedge shaped projections 25 to enhance R.F. absorption. Plates 23, 41, and 43 are slotted longitudinally to accommodate rubber or plastic cooling tubes such as 45 through which cooling fluid may pass. The fluid may also absorb R.F. energy. A pair of cooling tubes in each plate 23 makes an air-tight seal with the wall 39 of the adjacent waveguide half 11. Each plate 23 may be replaced by two plates of lossy maserial which are fixed to the individual halves 9, 11 of the waveguide. Drying gas e.g. air is supplied to the waveguides from inlet plenums 15 and moist gas is exhausted through outlet plenums 21. Fluttering of the moving web 7 at the input and exit ends of the waveguide is prevented by supplying high pressure gas to both sides of the web through holes 47 in the lossy plates 41, 43, from inlet plenums 15. The waveguide is of meander form. The halves of the waveguide may be wholly or partly covered with plastics.
GB57151/68A 1967-12-06 1968-12-02 Improvements in or relating to Microwave Driers Expired GB1192320A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US68846867A 1967-12-06 1967-12-06

Publications (1)

Publication Number Publication Date
GB1192320A true GB1192320A (en) 1970-05-20

Family

ID=24764538

Family Applications (1)

Application Number Title Priority Date Filing Date
GB57151/68A Expired GB1192320A (en) 1967-12-06 1968-12-02 Improvements in or relating to Microwave Driers

Country Status (4)

Country Link
US (1) US3475827A (en)
DE (1) DE1811598A1 (en)
FR (1) FR1599138A (en)
GB (1) GB1192320A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2132745A (en) * 1982-12-09 1984-07-11 House Food Industrial Co Microwave drying apparatus

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3560694A (en) * 1969-01-21 1971-02-02 Varian Associates Microwave applicator employing flat multimode cavity for treating webs
US3597567A (en) * 1969-09-24 1971-08-03 Ray M Johnson Microwave applicator for heating continuous web
US3589022A (en) * 1969-11-17 1971-06-29 Offen & Co Inc B Air ventilating and circulating system for microwave dryers
CH555516A (en) * 1973-04-11 1974-10-31 Kreis Ag MICROWAVE TUNNEL OVEN.
DE3130358A1 (en) * 1981-07-31 1983-02-17 Agfa-Gevaert Ag, 5090 Leverkusen DEVICE FOR HEATING AND / OR DRYING CONTINUOUS AREA MATERIALS WITH MICROWAVES
US6001300A (en) * 1989-12-06 1999-12-14 C.A. Lawton Company Method for making rigid three-dimensional preforms using directed electromagnetic energy
US5217656A (en) * 1990-07-12 1993-06-08 The C. A. Lawton Company Method for making structural reinforcement preforms including energetic basting of reinforcement members
US5423260A (en) * 1993-09-22 1995-06-13 Rockwell International Corporation Device for heating a printed web for a printing press

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2560903A (en) * 1949-08-27 1951-07-17 Raytheon Mfg Co Wave guide dielectric heating apparatus
US2868939A (en) * 1956-01-16 1959-01-13 Chemetron Corp Suppression of radiation from dielectric heating applicators
US3365562A (en) * 1962-12-17 1968-01-23 Cryodry Corp Apparatus and process for microwave treatment
FR1463338A (en) * 1966-01-10 1966-12-23 Eden Fisher And Hirst Microwav Device for heating non-metallic sheets by microwave frequencies, applicable in particular to drying paper in printing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2132745A (en) * 1982-12-09 1984-07-11 House Food Industrial Co Microwave drying apparatus

Also Published As

Publication number Publication date
FR1599138A (en) 1970-07-15
DE1811598A1 (en) 1970-12-03
US3475827A (en) 1969-11-04

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees