Technical Field
[0001]
The present invention relates to a continuous
coating apparatus for continuous coating of a coated
object made of a band-shaped material, in which the
coated object is moved with a coater applying a coating
material to the coated object, and is guided into a
10 heating chamber for heating the coated object thus coated
with the coating material and into a cooling chamber for
cooling the coated object thus heated.
the continuous coating apparatus has
Particularly,
the
features. While the coated object coated
following
with the
15 coating material by the coater is guided into the heating
chamber or while the coated object heated in the heating
chamber is guided into the cooling chamber, the
continuous coating apparatus is adapted to prevent
external diffusion of gas generated from the coating
20 material applied to the coated object and to prevent
adhesion of foreign substances to the coating film thus
applied to the coated object.
Background Art
25 [0002]
1
2
Heretofore, the following procedure has been taken
for continuous coating of the coated object made of a
band-shaped material such as a metal band. As set forth
in Patent Document 1, the continuous coating of the
5 coated object is performed by applying the coating
material onto the coated object of the band-shaped
material by means of the coater while moving the coated
object; heating the coated object coated with the coating
material by means of a heating device; and guiding the
10 coated object thus heated into a cooling unit for
cooling.
[0003]
The following problem is encountered in the case
where the coated object made of the band-shaped material
15 is continuously coated. In the course of guiding into
the heating system the coated object coated with the
coating material by the coater or in the course of guiding
into the cooling unit the coated object heated by the
heating system, an organic solvent, tar component and
20 the like contained in the coating material applied to
the coated object are gasified and externally diffused,
causing environmental damage.
[0004]
The prior art coating apparatuses have another
25 problem that in a case where right after the application
2
3
of the coating material, the coated object is directly
guided into the heating chamber where the coating
material applied to the coated object is dried by quickly
heating, the solvent and the like contained in the
5 coating material are rapidly evaporated to produce
surface unevenness of the coating film due to foaming.
To eliminate this problem, the following structure is
proposed by Patent Documents 2 and 3. A low-temperature
heating chamber for low-temperature heating of the
10 coated object coated with the coating material is
disposed at place ahead of the heating chamber where the
coated object coated with the coating material is dried
by heating. The coated object right after the
application of coating material is transferred from the
15 low-temperature heating chamber to the heating chamber
so as to prevent the coating material applied onto the
coated object from being heated quickly.
[0005]
However, the structure proposed by Patent
20 Documents 2 and 3 is not designed to obviate the problem
that the organic solvent, tar component and the like
contained in the coating material applied to the coated
object are gasified and externally diffused in the course
of guiding into the heating chamber the coated object
25 coated with the coating material by the coater or in the
3
4
course of guiding into the cooling chamber the coated
object heated in the heating chamber. While the coated
object heated in the heating chamber is guided into the
cooling chamber, in particular, it is impossible to
5 prevent the organic solvent, tar component and the like
contained in the coating material from being gasified
and externally diffused. Such gases are externally
diffused from an outlet opening through which the coated
object is discharged from the continuous coating
10 apparatus.
Citation List
Patent Document
[0006]
Patent Document 1: JP-A No.2009-214066
15 Patent Document 2: JP-A No.1994(H6)-114331
Patent Document 3: JP-A No.1994(H6)-262132
Disclosure of Invention
Technical Problem
20 [0007]
In the continuous coating apparatus for continuous
coating of the coated object made of the band-shaped
material, in which the coated object is moved with the
coater applying the coating material to the coated object,
25 and is guided into the heating chamber for heating the
4
5
coated object thus coated with the coating material and
into the cooling chamber for cooling the coated object
thus heated, an object of the invention is to obviate
the problems including the external diffusion of the gas
5 generated from the coating material applied to the coated
object and the adhesion of foreign substances to the
coating film applied to the coated object. The problems
occur while the coated object coated with the coating
material by the coater is guided into the heating chamber
10 or while the coated object heated in the heating chamber
is guided into the cooling chamber.
Solution to Problem
[0008]
According to an aspect of the invention for
15 achieving the above objects, a continuous coating
apparatus for continuous coating of a coated object made
of a band-shaped material, in which the coated object
is moved with a coater applying a coating material to
the coated object, and is guided into a heating chamber
20 for heating the coated object thus coated with the
coating material and into a cooling chamber for cooling
the coated object thus heated, wherein a gas recovery
chamber for recovering gas generated from the coating
material applied to the coated object is disposed at
25 least one of the places between the coater or the coater
5
6
disposed in a coating chamber and the heating chamber
and between the heating chamber and the cooling chamber,
and wherein heating means is provided for heating an
inside surface of the gas recovery chamber.
5 [0009]
As just described above, if the gas recovery chamber
for recovering gas generated from the coating material
applied to the coated object is disposed at place between
the coater or the coater disposed in the coating chamber
10 and the heating chamber or between the heating chamber
and the cooling chamber, the gas generated from the
coating material applied to the coated object is
prevented from being externally diffused while the
coated object coated with the coating material by the
15 coater is guided into the heating chamber or while the
coated object heated by the heating chamber is guided
into the cooling chamber.
[ 0010 l
As just described above, if the heating means is
20 provided for heating the inside surface of the gas
recovery chamber, the gas generated from the coating
material is prevented from being liquefied or solidified
as cooled on the inside surface of the gas recovery
chamber. Thus is obviated a problem that the resultant
25 liquid substances or solid substances fall on the coated
6
5
7
object coated with the coating material, causing the
coated object to suffer adhesion of foreign substances
to the coating film applied to the coated object.
[0011]
If the coater is disposed in the coating chamber,
the external diffusion of gas generated from the coating
material in the coater is also prevented.
[0012]
To use the heating means for heating the inside
10 surface of the gas recovery chamber, the above continuous
coating apparatus can have a structure wherein the gas
recovery chamber has its wall constructed in a double
structure in order to define a flow passage in the wall,
and the inside surface of the gas recovery chamber is
15 heated by the heating means which feeds a heated air into
the flow passage. This structure is adapted to heat only
the inside surface of the gas recovery chamber. In
comparison to a case where the interior of the gas
recovery chamber is wholly heated, this arrangement
20 reduces cost for heating. Further, this arrangement
also obviates a problem that the interior of the gas
recovery chamber is overheated to induce rapid
evaporation of the solvent and the like contained in the
coating material applied to the coated object, resulting
25 in the production of surface unevenness of the coating
7
8
film due to foaming.
[0013]
When the inside surface of the gas recovery chamber
is heated as described above, it is preferred to heat
5 the inside surface of the gas recovery chamber to a
temperature equal to or higher than a boiling point of
the gas generated from the coating material applied to
the coated object. This is for the sake of positive
prevention of a problem that the gas generated from the
10 coating material applied to the coated object is
liquefied or solidified as cooled on the inside surface
of the gas recovery chamber.
[ 0014]
The above continuous coating apparatus is
15 constructed such that after the gas generated from the
coating material applied to the coated object is
recovered in the gas recovery chamber, the recovered gas
can be discharged from the gas recovery chamber through
an exhaust air duct into a gas treatment facility and
20 treated therein.
Advantageous Effects of Invention
[0015]
In the continuous coating apparatus according to
the invention, as described above, the gas recovery
25 chambers for recovering the gas generated from the
8
9
coating material applied to the coated object are
disposed between the coater and the heating chamber or
between the heating chamber and the cooling chamber.
Therefore, the gas generated from the coating material
5 applied to the coated object is prevented from being
externally diffused while the coated object coated with
the coating material by the coater is guided into the
heating chamber or while the coated object heated in the
heating chamber is guided into the cooling chamber.
10 [0016]
In the continuous coating apparatus according to
the invention, as described above, the inside surface
of the gas recovery chamber is heated by the heating means.
Therefore, the gas generated from the coating material
15 applied to the coated object is prevented from being
liquefied or solidified as cooled on the inside surface
of the gas recovery chamber. Thus is obviated the
problem that the resultant liquid substances or solid
substances fall on the coated object coated with the
20 coating material, resulting in the adhesion of foreign
substances to the coating film applied to the coated
object.
Brief Description of Drawings
25 [0017]
9
10
Fig.l is a schematic diagram illustrating a
continuous coating apparatus according to an embodiment
of the invention.
5 Best Mode of Invention
[0018)
A continuous coating apparatus according to an
embodiment of the invention will be specifically
described as below with reference to the accompanying
10 drawing. It is noted here that the continuous coating
apparatus according to the invention is not limited to
the following embodiment but may otherwise be embodied
as needed without departing from the spirit and scope
of the invention.
15 [0019)
For continuous coating of a coated object X being
moved, which is made of a band-shaped material such as
a metal band, the continuous coating apparatus according
to the embodiment shown in Fig.l includes: a coating
20 chamber 10 provided with a coater 11 including a roll
coater for applying a coating material to the coated
object X; a first gas recovery chamber 20 for recovering
gas generated from the coating material applied to the
coated object X in the coating chamber 10; a heating
25 chamber 30 for heating the coated object X coated with
10
11
the coating material; a second gas recovery chamber 40
for recovering gas generated from the coating material
on the coated object X having been heated in the heating
chamber 30; and a cooling chamber 50 for cooling the
5 coated object X thus heated. These components are
continuously arranged.
[0020]
The continuous coating of the coated object X is
performed by guiding the coated object X being moved as
10 described above through the coating chamber 10, the first
gas recovery chamber 20, the heating chamber 30, the
second gas recovery chamber 40 and the cooling chamber
50 in the order named.
15
[0021]
The continuous coating apparatus of this
embodiment is provided with an air-heating furnace 60
as heating means. This air-heating furnace 60 feeds the
heated air into a supply air duct 61, which feeds the
heated air into the first gas recovery chamber 20, the
20 heating chamber 30 and the second gas recovery chamber
40 via a discrete supply air duct 6la, 6lb, 6lc,
respectively. The discrete supply air ducts 6la, 6lb,
6lc are each provided with a flow regulator 62a, 62b,
62c. The flow regulators 62a, 62b, 62c respectively
25 regulate the flow rate of heated air fed to the first
11
12
gas recovery chamber 20, the heating chamber 30 and the
second gas recovery chamber 40.
[0022]
In order to recover the gas generated from the
5 coating material in the coating chamber 10, the first
gas recovery chamber 20, the heating chamber 30, and the
second gas recovery chamber 40, the continuous coating
apparatus of the embodiment is constructed such that
discrete exhaust air ducts 72a, 72b, 72c, 72d
10 respectively disposed at the coating chamber 10, the
first gas recovery chamber 20, the heating chamber 30,
and the second gas recovery chamber 40 are connected to
an exhaust air duct 72 equipped with a fan 71. The gas
guided through the discrete exhaust air ducts 72a, 72b,
15 72c, 72d is guided into a gas treatment facility 70 via
the above exhaust air duct 72. In the gas treatment
facility 70, the gas is so treated as to remove harmful
components therefrom. Subsequently, the treated gas is
discharged from an exhaust tower 73. The discrete
20 exhaust duct 72c of the heating chamber 30 is provided
with a regulator valve 74 for regulating the amount of
exhaust gas.
[0023]
According to the continuous coating apparatus of
25 the embodiment, the coated object X being moved is guided
12
13
into the coating chamber 10, where the coated object X
is coated with the coating material by means of the coater
11 disposed in the coating chamber 10. Further, the gas
generated from the coating material in this coating
5 chamber 10 is discharged through the discrete exhaust
air duct 72a and guided through the exhaust air duct 72
into the gas treatment facility 70 for treatment.
[0024)
The coated object X thus coated with the coating
10 material is transferred from the coating chamber 10 to
the first gas recovery chamber 20.
[0025)
In the first gas recovery chamber 20 receiving the
coated object X thus coated with the coating material,
15 the gas generated from the coating material on the coated
object is recovered, discharged through the discrete
exhaust air duct 72b and guided through the exhaust air
duct 72 into the gas treatment facility 70 for treatment.
The first gas recovery chamber 20 has its wall 21
20 constructed in a double structure such as to define a
flow passage 22 in the wall 21. The heated air guided
into the first gas recovery chamber 20 via the discrete
supply air duct 6la is guided into this flow passage 22
so as to heat an inside surface of the first gas recovery
25 chamber 20. Subsequently, this heated air is guided into
13
14
the heating chamber 30 via a guiding duct 6ld.
[0026]
If the inside surface of the first gas recovery
chamber 20 is heated in this manner, the gas generated
5 from the coating material is prevented from being
liquefied or solidified as cooled on the inside surface
of the first gas recovery chamber 20. Thus is obviated
a problem that the resultant liquid substances or solid
substances fall on the coated object X coated with the
10 coating material so that a coating film on the coated
object X suffers adhesion of foreign substances. This
method is adapted for adequate heating of only the inside
surface of the first gas recovery chamber 20. In
comparison with a case where the first gas recovery
15 chamber 20 is wholly heated, this method reduces heating
cost. Further, this method also obviates a problem that
the interior of the first gas recovery chamber 20 is
overheated to induce rapid evaporation of the solvent
and the like contained in the coating material applied
20 to the coated object X, resulting in surface unevenness
of the coating film due to foaming. When the inside
surface of the first gas recovery chamber 20 is heated
as described above, the temperature of the inside surface
of the first gas recovery chamber 20 is preferably
25 maintained at or above a boiling point of the gas
14
5
10
15
generated from the coating material applied to the coated
object X so as to prevent the liquefaction or
solidification of the above gas.
[ 0027]
Next, the coated object passed through the first
gas recovery chamber 20 is guided into the heating
chamber 30, where the coated object X is heated to dry
the coating material applied to the coated object X.
[0028]
The heated air is guided into the heating chamber
30 through the discrete supply air duct 6lb so as to heat
the coated object X for drying the coating material
applied to the coated object X. Further, the gas
generated from the coating material is discharged
15 through the discrete exhaust air duct 72c and guided
through the exhaust air duct 72 into the gas treatment
facility 70 for treatment.
[0029]
Subsequently, the coated object X thus heated in
20 the heating chamber 30 is guided into the second gas
recovery chamber 40.
[0030]
In the second gas recovery chamber 40, the gas
generated from some of the coating material on the coated
25 object X that was not fully dried in the preceding heating
15
16
chamber 30 is recovered. The recovered gas is discharged
through the discrete exhaust air duct 72d and guided
through the exhaust air duct 72 into the gas treatment
facility 70 for treatment. Similarly to the first gas
5 recovery chamber 20, this second gas recovery chamber
40 also has its wall 41 constructed in a double structure
such as to define a flow passage 42 in the wall 41. The
heated air fed into the second gas recovery chamber 40
via the discrete supply air duct 6lc is guided into this
10 flow passage 42. Thus, an inside surface of the second
gas recovery chamber 40 is heated by this the heated air.
Subsequently, this heated air is guided into the heating
chamber 30 via a guiding duct 61e.
15
[0031]
Similarly to the above-described first gas
recovery chamber 20, the heating of the inside surface
of the second gas recovery chamber 40 in this manner
obviates the problem that the gas generated from the
coating material is liquefied or solidified as cooled
20 on the inside surface of the second gas recovery chamber
40, and the resultant liquid substances or solid
substances fall on the coated object X coated with the
coating material, resulting in the adhesion of foreign
substances to the coating film on the coated object X.
25 Further, this chamber is adapted for adequate heating
16
17
of only the inside surface of the second gas recovery
chamber 40 so that the heating cost is reduced as compared
with a case where the second gas recovery chamber 40 is
wholly heated. When the inside surface of the second gas
5 recovery chamber 40 is heated, it is preferred just as
in the above-described first gas recovery chamber 29 that
the temperature of the inside surface of the second gas
recovery chamber 40 is maintained at or above the boiling
point of the gas generated from the coating material
10 applied to the coated object X so as to prevent the
liquefaction or solidification of the above gas.
[0032]
The coated object X passed through the second gas
recovery chamber 40 is guided into the cooling chamber
15 50, where the coated object X heated in the heating
chamber 30 is cooled. The coated object X thus cooled
is discharged from the cooling chamber 50 for continuous
coating of the coated object X.
[0033]
20 The continuous coating apparatus of the embodiment
is provided with the first gas recovery chamber 20
between the coating chamber 10 and the heating chamber
30 and with the second gas recovery chamber 40 between
the heating chamber 30 and the cooling chamber 50, as
25 the gas recovery chamber for recovery of the gas
17
18
generated from the coating material applied to the coated
object X. However, the continuous coating apparatus may
also be provided with either one of the first gas recovery
chamber 20 and the second gas recovery chamber 40.
5 [0034]
The method of heating the inside surface of the
first gas recovery chamber 20 and the inside surface of
the second gas recovery chamber 40 is not limited to that
suggested by this embodiment. Alternatively, for
10 example, heating element (not shown) such as a heater
can be embedded in the wall 21 of the first gas recovery
chamber 20 and/or the wall 41 of the second gas recovery
chamber 40.

Claims:
1. A continuous coating apparatus for continuous
coating of a coated object made of a band-shaped material,
in which the coated object is moved with a coater applying
5 a coating material to the coated object and is guided
into a heating chamber for heating the coated object thus
coated with the coating material and into a cooling
chamber for cooling the coated object thus heated,
wherein a gas recovery chamber for recovering gas
10 generated from the coating material applied to the coated
object is disposed at least one of the places between
the coater or the coater disposed in a coating chamber
and the heating chamber and between the heating chamber
and the cooling chamber, and wherein heating means is
15 provided for heating an inside surface of the gas
recovery chamber.
2. The continuous coating apparatus according to
Claim 1, wherein the gas recovery chamber has its wall
20 constructed in a double structure in order to define a
flow passage in the wall, and the inside surface of the
gas recovery chamber is heated by the heating means which
feeds a heated air into the flow passage.
25 3. The continuous coating apparatus according to
20
5
10
21
Claim 1 or 2, wherein the inside surface of the gas
recovery chamber is heated to a temperature equal to or
higher than a boiling point of the gas generated from
the coating material applied to the coated object.
4. The continuous coating apparatus according to any
one of Claims 1 to 3, wherein the gas recovered by the
gas recovery chamber is guided through an exhaust air
duct into a gas treatment facility and treated therein.