Drying and gas or vapor contact with solids – Apparatus – Rotary or swinging carrier or rack
Reexamination Certificate
1999-08-12
2001-08-07
Gravini, Stephen (Department: 3749)
Drying and gas or vapor contact with solids
Apparatus
Rotary or swinging carrier or rack
C034S187000
Reexamination Certificate
active
06269550
ABSTRACT:
The present invention concerns a drying machine for shredded tobacco, in particular (but not exclusively) for rolls of expanded shredded tobacco.
The drying machine according to the invention is characterised in that it includes:
a tunnel structure with an input end and an output end in which a chamber is defined with inclined longitudinal downwardly converging side walls;
a substantially horizontal conveyor which extends within the tunnel structure adjacent the lower edges of the converging side walls, for transferring a layered flow of shredded tobacco from the inlet to the outlet; and
a ventilation system including:
a delivery manifold which extends over the conveyor;
an array of essentially vertical tubes which extends from the delivery manifold to a predetermined distance from the conveyor, between the lower edges of the converging side walls;
a return manifold communicating with lateral regions of the chamber situated at the sides of the array of tubes and above the converging side walls; and
air conditioning and recycling means interposed between the outlet of the return manifold and the inlet of the delivery manifold and adapted to supply a flow of conditioned air through the tubes towards the conveyor in such a way that, in use, the air leaving the tubes creates a bed of air above the conveyor for fluididizing the layered flow of tobacco, and the air emitted from the tubes is then returned to the return manifold through the lateral regions of the chamber in such a way that any particles of tobacco carried by the return air flow in the lateral regions of the chamber fall under gravity onto the converging side walls and down onto the conveyor.
Further characteristics and advantages of the invention will become clear from the following detailed description, given purely by way of non-limitative example, with reference to the accompanying drawings, in which:
FIG. 1
is a partially-sectioned side view of a drying machine according to the invention;
FIG. 2
is a sectional view taken on the line II—II of
FIG. 1
;
FIG. 3
is a plan view from above of the machine shown in
FIGS. 1 and 2
;
FIG. 4
is a view on an enlarged scale of a detail of the machine shown in
FIG. 2
;
FIG. 5
is a view on an enlarged scale of a detail of
FIG. 4
;
FIG. 6
is a partially sectioned view which shows a cleaning device associated with a filtration grid included in the machine according to the invention; and
FIG. 7
is a partial perspective view of the cleaning device of FIG.
6
.
REFERENCES:
patent: 2713213 (1955-07-01), Bogaty
patent: 3060590 (1962-10-01), Brown
patent: 3229377 (1966-01-01), Hoyt
patent: 4109394 (1978-08-01), Hoyt
patent: 4201499 (1980-05-01), Buske et al.
patent: 4306359 (1981-12-01), Hoyt
patent: 4322447 (1982-03-01), Hubbard
patent: 0226673A (1987-07-01), None
patent: 2236428A (1975-02-01), None
patent: 2026668A (1980-02-01), None
patent: 2085564A (1982-04-01), None
patent: WO 7900800A (1979-10-01), None
Comas S.p.A.
Gravini Stephen
Mattera Michelle A
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