MICROWAVE HEATING APPARATUS

• US 3,740,515 A
• Filed: 07/07/1971
• Issued: 06/19/1973
• Est. Priority Date: 11/27/1970
• Status: Expired due to Term

• Current Assignee: Allan L. Vankoughnett
• Original Assignee: Allan L. Vankoughnett
• Inventors: Vankoughnett, Allan L.
• Primary Examiner(s): Truhe, J. V.
• Assistant Examiner(s): Jaeger, Hugh D.
• Application Number:
  US05/160,416
• Time in Patent Office: 713 Days
• Field of Search: 219/10.55,10.61 343/772
• US Class Current: 219/693
• CPC Class Codes: H05B 6/78 Arrangements for continuous movement of material

Abstract

A microwave heating apparatus for line heating a dielectric sheet material comprises a trough waveguide having a central ridge extending along the trough, and a metal member spaced from the ridge so that the sheet may be passed in the longitudinal direction of the ridge and between the ridge and the metal member. The dielectric sheet material may be a paper carrying an ink mark to be dried, and the metal member may be a metal drum having the paper extending around it. The trough waveguide extends circumferentially around a portion of the drum and closely follows the drum contour.

Claims

1. Microwave heating apparatus, comprising an open trough waveguide having side walls and a base, a ridge attached to a central region of the base between the side walls and extending longitudinally of the waveguide, the height of the ridge being substantially the same as the height of the side walls, and a metal member extending along and covering the whole length of the open side of the trough but spaced from the trough, said metal member forming a guide for passing one side of dielectric sheet adjacent the ridge with the metal member on the other side of the sheet, so that energisation of the waveguide will heat the sheet passed between the ridge and the metal member.