| (19) |
 |
|
(11) |
EP 0 269 358 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
30.08.1989 Bulletin 1989/35 |
| (43) |
Date of publication A2: |
|
01.06.1988 Bulletin 1988/22 |
| (22) |
Date of filing: 18.11.1987 |
|
| (51) |
International Patent Classification (IPC)4: F26B 17/00 |
|
| (84) |
Designated Contracting States: |
|
DE ES FR GB IT NL |
| (30) |
Priority: |
25.11.1986 GB 8628138
|
| (71) |
Applicant: PETRIE & McNAUGHT LIMITED |
|
Rochdale, Lancashire OL16 5NX (GB) |
|
| (72) |
Inventors: |
|
- Soltau, William Ernest
Blackburn
Lancashire
BB2 6SD (GB)
- Fryars, Thomas
Singleton
Blackpool
Lancashire
FY6 8NQ (GB)
|
| (74) |
Representative: Mayes, Stuart David et al |
|
BOULT, WADE & TENNANT
27 Furnival Street
London, EC4A 1PQ
London, EC4A 1PQ (GB) |
|
| |
|
| (54) |
Drying or baking apparatus |
(57) A drying or baking apparatus comprises a chamber (10) divided into two compartments
(11, 12) by a metal air-pervious conveyor (13) for granular material to be dried or
baked and with the compartments being connected by ducting (14) incorporating, or
having associated therewith, suction fan means (15) and air heating means (16). The
apparatus is characterised by a perforated electrode structure (22) parallel with
and spaced from the granular material-supporting surface of the conveyor (13), and
radio frequency heating means connected to the perforated electrode structure (22)
and the pervious metal conveyor (13) which serves as the other electrode of the radio
frequency heating means, whereby a radio frequency heating means is provided so that
the granular material is subjected both to internal radio frequency heating and surface
air heating.