Technical Field
[0001] The present invention relates to a spraying device for spraying a liquid product
onto a paper web useful for applying a coating of liquid product sprayed onto a moving
paper web.
[0002] The device of the present invention is useful for creating a barrier coating against
fats, oil and water, and/or an anti-scratch coating, and/or a pigmentation coating,
and/or a coating of any other surface treatment on a paper web, whereby obtaining
a waterproof paper web which can be used, for example, in forming hydrophobic corrugated
cardboard, or a paper web with other properties and for other uses.
Background of the Invention
[0003] Document
WO 2013167771 A1 discloses an applicator device for applying a liquid product on a paper comprising
a spray chamber with an opening facing the path of a moving paper web. The spray chamber
has a front wall, a rear wall, side walls, and a base opposite the opening. A plurality
of spraying nozzles is installed inside the spray chamber and said nozzles are connected
to a liquid product supply source and oriented so as to direct the sprayed liquid
product towards the opening across the spray chamber in order to spray the liquid
product onto a surface of the moving paper web.
[0004] A drawback of the device described in the cited document
WO 2013167771 A1 is that part of the sprayed liquid product is deposited and accumulated on the inner
surfaces of the walls of the spray chamber, making frequent cleaning operations necessary.
[0005] Document
WO 0042254 A1 describes an applicator apparatus for applying a liquid product on a paper or cardboard
web comprising a spray chamber envisaged for being installed in a paper web manufacturing
line. The spray chamber is formed by a plurality of walls and a plurality of spraying
nozzles is installed therein, with the mentioned drawback associated with the unwanted
deposition and accumulation of liquid product on the walls of the spray chamber.
[0006] Document
WO 2006079678 A1 discloses an applicator device for applying a liquid product on a paper sheet including
a plurality of spraying nozzles installed such that they are rotational so as to regulate
the angle of incidence of the sprayed liquid product with respect to the paper sheet,
and a system for adapting the width of the device to the width of the paper sheet.
[0007] Document
EP 2146003 A2 describes a device for applying a liquid product curtain as a coating on a paper
sheet including a suction nozzle for absorbing part of the liquid product that is
sprayed and not deposited on the paper sheet.
[0009] Document
JP 201200047 6A discloses a method of manufacturing lotion paper by which a ply made of a plurality
of layered base paper webs is temporarily divided into two base paper webs, a liquid
is attached to the divided two base paper webs from the inner side of the ply, and
the base paper webs to which the first liquid is attached are layered on each other
again to make the ply. The moving base paper webs are guided by guide rollers and
the liquid is sprayed onto a seaming portion of the two moving base paper webs by
means of a plurality of spraying nozzles arranged on a support located between the
two base paper webs inside a spray chamber. The spray chamber is delimited by several
contiguous sections of the two base paper webs, and by side walls perpendicular to
the axes of the guide rollers. Each of the sections of the base paper webs is defined
between two of the guide rollers.
[0010] Document
DE 102008021541 A1 discloses a method for applying a treatment agent to a surface of a paper web (4).
The paper web to be treated (4) is passed through an entrance slit (7) in an application
chamber (5) having spray nozzles (6). The treating agent is applied through the spray
nozzles (6) on at least one side of the paper web (4). The paper web (4) treated with
the treatment agent is guided through a press nip between two rotating press rolls
(3). The application chamber (5) is delimited by several walls and at least one of
the rotating press rolls (3) forms part of the walls of the application chamber (5).
Disclosure of the Invention
[0011] The present invention contributes to mitigate the foregoing and other drawbacks by
providing a spraying device for spraying a liquid product onto a paper web comprising
a spray chamber delimited to a large extent by a moving paper web guided by parallel
guide rollers, and a plurality of spraying nozzles connected to a liquid product supply
source and arranged inside said spray chamber to spray said liquid product onto said
moving paper web.
[0012] Preferably, the spray chamber is delimited, at least in part, by a support on which
said spraying nozzles are arranged and by at least two contiguous sections of the
paper web, wherein each of said sections of the paper web is defined between two of
said guide rollers and, wherein one of said contiguous sections of the paper web faces
directly the spraying nozzles. The two contiguous sections of the paper web therefore
together form an angle containing, including or encompassing the spraying nozzles.
[0013] Optionally, the guide rollers can define more than two sections of the paper web
delimiting the spray chamber, with one or more guide rollers located inside the spray
chamber. The spraying nozzles are preferably arranged so as to direct the sprayed
liquid product towards a single section of the paper web.
[0014] The plurality of sections of the paper web delimiting the spray chamber contribute
to minimizing the area of other surfaces of the spray chamber exposed to the liquid
product sprayed by the spraying nozzles, and therefore the drawback of the unwanted
deposition and accumulation of liquid product on surfaces other than the paper web
is minimized.
[0015] Regardless of the number of sections of the paper web in the spray chamber, the spray
chamber is further delimited by side walls perpendicular to the axes of the guide
rollers. These side walls are movable along guides associated with a structure of
the device in a direction parallel to the axes of the guide rollers and can be fixed
in desired positions along said guides to adjust the width of the spray chamber to
the width of the paper web.
[0016] In one embodiment, the support on which the spraying nozzles are arranged is a rotary
support which can be rotated with respect to a rotation axis parallel to the axes
of the guide rollers to regulate the spraying angle of the spraying nozzles, i.e.,
the angle of the spraying nozzles with respect to the section of the paper web towards
which they are directed. Preferably, this rotary support includes a tubular wall defining
an enclosure in which the spraying nozzles are installed. The tubular wall rotates
together with the rotary support and has at least one longitudinal opening through
which the liquid product is sprayed into the spray chamber by the spraying nozzles.
[0017] In one embodiment, the spraying nozzles are arranged on the rotary support according
to two or more parallel and adjacent rows of spraying nozzles. For, example, the parallel
and adjacent rows of spraying nozzles can be three or more in number. The rows are
parallel to the rotation axis of the rotary support and therefore parallel to a plane
containing the paper web to be sprayed. Preferably, the spraying nozzles of each row
are staggered with regard to the spraying nozzles of an adjacent row.
[0018] In a preferred embodiment, each of said spraying nozzles is connected to at least
three conduits supported on the support on which the spraying nozzles are arranged,
preferably said rotary support. A first one of said conduits is a main liquid product
supply tube providing a liquid product to be sprayed. A second one of the conduits
is a first pressurized gas supply tube providing a pressurized gas used to generate
a spray jet in combination with the liquid product. The third one of the conduits
is a second pressurized gas supply tube providing a pressurized gas used to blow surrounding
the spray jet and thus adjust a cone shape of said spray jet. Preferably, the pressurized
gas is pressurized air. Each spraying nozzle can be connected to auxiliary conduits
providing auxiliary liquid products to be alternatively or simultaneously sprayed
in addition to these three conduits.
[0019] Each of said conduits has associated thereto regulation means allowing to control
a supply pressure of each of the liquids or gasses in order to project a spray jet
on the inner surface of said moving paper web with a controlled speed of impact of
the sprayed product and a controlled width of a cone shape of the sprayed product.
In general, it is convenient to regulate the speed of spray jet so as the sprayed
liquid product adhere to the paper web without rebounding therefrom.
[0020] Generally, the spray chamber is also delimited in part by portions of the tubular
wall of the rotary support adjacent to its longitudinal opening. In one embodiment,
at least two of the guide rollers are arranged adjacent to the tubular wall of the
rotary support, such that the spray chamber is delimited by the paper web, by the
portions of the tubular wall adjacent to its longitudinal opening, and by the side
walls.
[0021] Preferably, the spraying nozzles are axially movable along guides associated with
the rotary support in a direction parallel to the axes of the guide rollers and can
be fixed in a selected position along the rotary support to centre or adjust the position
of the spraying nozzles with respect to the paper web. A valve arrangement also allows
individually opening and closing each of the spraying nozzles to adjust the number
of active spraying nozzles to the width of the paper web being treated, in each case.
[0022] In one embodiment, one or more of the guide rollers can be moved in a direction perpendicular
to its own axis to facilitate access to the spray chamber, even when the paper web
is installed on the guide rollers.
[0023] In one embodiment, the spraying device further comprises a cleaning chamber located
outside the spray chamber and outside the tubular wall of the rotary support. This
cleaning chamber internally has a plurality of cleaning nozzles connected to a cleaning
liquid supply source, said cleaning liquid being water or another solvent suitable
for dissolving the liquid product used. The rotary support can be rotated to an angular
cleaning position in which the longitudinal opening of the tubular wall of the rotary
support is facing the cleaning chamber and the spraying nozzles are facing said cleaning
nozzles.
[0024] In one embodiment, the cleaning chamber includes cleaning brushes that interfere
with the spraying nozzles preferably while the cleaning liquid is sprayed by the cleaning
nozzles. Preferably, the cleaning brushes are movable to sweep an outlet and/or areas
adjacent to the outlet of the spraying nozzles.
[0025] Additionally, the cleaning liquid can also be circulated through the circuit supplying
the liquid product to the spraying nozzles in order to clean said circuit and the
inside of the spraying nozzles at the end of an operation for applying a liquid product
on a paper web.
Brief Description of the Drawings
[0026] The above and other features and advantages will be better understood from the following
detailed description of exemplary embodiments, which are merely illustrative and not
limitative, with reference to the accompanying drawings, in which:
Figure 1 is a cross-sectional view of a spraying device for spraying a liquid product
onto a paper web according to an embodiment of the present invention, in a working
position;
Figure 2 is a cross-sectional view of the spraying device of Figure 1 in a cleaning
position;
Figure 3 is a cross-section view of a spraying device for spraying a liquid product
onto a paper web according to another embodiment of the present invention.
Figure 4 is a front perspective view of the spraying device of Figure 1;
Figure 5 is a rear perspective view of the spraying device of Figure 1;
Figure 6 is a sectioned partial view of a rotary support with a tubular wall included
in the spraying device of Figure 1;
Figure 7 is a partial cross-section view of fluid connections for a spraying nozzle
according to another embodiment of the invention;
Figure 8 is a front view showing a particular arrangement of the spraying nozzles
according to still another embodiment of the invention; and
Figure 9 is a partial cross-section view of a cleaning device according to still another
embodiment of the invention.
Detailed Description of Exemplary Embodiments
[0027] Figures 1, 2, 4 and 5 show a spraying device for spraying a liquid product onto a
paper web, comprising a structure 8 on which there are supported mutually parallel
guide rollers 6 guiding the path of a moving paper web 2. The axes of the guide rollers
6 are not in the same plane, such that the guide rollers 6 define between them a plurality
of sections of the paper web forming different angles with one another.
[0028] There is further supported on the structure 8 of the spraying device a rotary support
7 rotatable about a rotation axis parallel to the axis of the guide rollers 6. On
said rotary support 7 there are arranged a plurality of spraying nozzles 1 distributed
along the length thereof and connected to a liquid product supply source. In this
embodiment, the spraying nozzles 1 are arranged in a single row parallel to the rotation
axis. The rotary support 7 (described in further detail below in relation to Figure
6) includes a tubular wall 7a defining an enclosure in which the spraying nozzles
are installed. The tubular wall 7a has a longitudinal opening 4 facing and aligned
with the spraying nozzles 1.
[0029] In an alternative embodiment shown in Figure 8, spraying nozzles 1 are arranged on
the rotary support 7 according two or more parallel and adjacent rows of spraying
nozzles 1, wherein the rows are parallel to the rotation axis and therefore parallel
to a plane containing the paper web 2 to be sprayed. The spraying nozzles 1 of each
row are staggered with regard to the spraying nozzles 1 of an adjacent row.
[0030] The spraying device further comprises a pair of side walls 5 perpendicular to the
axes of the guide rollers 6 supported in the structure 8. These side walls 5 are configured
according to the path of the different sections of the paper web 2 and are separated
from one another by a distance according to the width of the paper web 2.
[0031] Two of the guide rollers 6 are arranged adjacent to the tubular wall 7a of the rotary
support 7, such that several of the different contiguous sections of the paper web
2, portions of the tubular wall 7a of the rotary support 7 adjacent to the longitudinal
opening 4, and the side walls 5 delimit an inner space forming the spray chamber 3.
Two of the guide rollers 6 are located inside the spray chamber 3. The liquid product
is sprayed by the spraying nozzles 1 through the longitudinal opening 4 into the spray
chamber 3 and onto the paper web 2.
[0032] Two contiguous sections of the paper web 2 together forming an acute angle containing,
including or encompassing the spraying nozzles 1 are defined between one of the guide
rollers 6 located inside the spray chamber 3 and two other guide rollers 6.
[0033] The spraying nozzles 1 are directed towards one of the sections of the moving paper
web 2 so as to apply the liquid product sprayed thereon. The rotary support 7 together
with the tubular wall 7a can be rotated with respect to said rotation axis so as to
regulate the spraying angle of the spraying nozzles 1 with respect to the section
of the paper web 2 on which the sprayed liquid product is to be applied.
[0034] The side walls 5 are connected to guide rods 9 (Figure 4) supported on the structure
8, such that the side walls are movable in a direction parallel to the axes of the
guide rollers 6 and can be fixed in desired positions to adjust the width of the spray
chamber 3 to the width of the paper web 2. The spraying nozzles 1 are axially movable
along the rotary support 7 in a direction parallel to the axes of the guide rollers
6.
[0035] The circuit supplying the liquid product to the spraying nozzles 1 includes a valve
arrangement which allows individually opening and closing each of the spraying nozzles
1. So when a paper web 2 is used that is narrower than the maximum allowable width
of the device, only those spraying nozzles 1 which are inside the spray chamber 3
will be left active, while the rest will be closed.
[0036] Additionally, at least one of the guide rollers 6 adjacent to the tubular wall 7a
of the rotary support 7 can be moved in a direction perpendicular to its own axis
to facilitate access to the spray chamber 3 even when the paper web 2 is installed
on the guide rollers 6.
[0037] The spraying device of the present invention further comprises a cleaning chamber
12 provided with a plurality of cleaning nozzles 10 connected to a cleaning liquid
supply source. This cleaning chamber 12 is located outside the spray chamber 3 and
outside the tubular wall 7a of the rotary support 7. The rotary support 7 can be rotated
to an angular cleaning position (Figure 2) in which the longitudinal opening 4 of
the tubular wall 7a is facing the cleaning chamber 12 and the spraying nozzles 1 are
facing the cleaning nozzles 10. The cleaning liquid can therefore be sprayed by the
cleaning nozzles 10 onto the spraying nozzles 1 and other elements housed inside the
tubular wall 7a. In Figure 2, the paper web is not installed on the guide rollers
6. In an alternative embodiment shown in Figure 9, the cleaning chamber 12 includes
cleaning brushes 30 arranged adjacent the cleaning nozzles 10 that interfere with
the spraying nozzles preferably while the cleaning liquid is sprayed by the cleaning
nozzles 10. In the example shown, the cleaning brushes 30 are mounted on a support
11 which is rotated about an axis parallel to a central axis of the cleaning nozzle
10 by actuating means (not shown), to sweep an outlet 1 a of the spraying nozzles
1 and/or areas adjacent thereto.
[0038] During a cleaning operation, the cleaning liquid can also be circulated through the
circuit supplying the liquid product to the spraying nozzles 1 in order to clean said
circuit and the inside of the spraying nozzles 1, and through a fixed conduit 28 provided
with nozzles 29 located inside the tubular wall 7a (described in further detail below
in relation to Figure6) in order to clean the inner surfaces of the tubular wall 7a
and other elements housed therein at the end of an operation for applying a liquid
product on a paper web 2.
[0039] Figure 3 shows another embodiment of the spraying device which only differs from
the one described above with reference to Figures 1, 2, 4 and 5 in the arrangement
of the guide rollers 6 and therefore in the path followed by the moving paper web
2. In the embodiment of Figure 3, there are two guide rollers 6 adjacent to the tubular
wall 7a of the rotary support 7 and a third guide roller 6 located therebetween and
away from the tubular wall 7a of the rotary support 7, so that the spray chamber 3
is delimited by the two contiguous sections of the paper web 2 defined by these three
guide rollers 6, portions of the tubular wall 7a of the rotary support 7 adjacent
to the longitudinal opening 4, and the side walls 5. The mentioned two contiguous
sections of the paper web 2 together form an angle containing, including or encompassing
the spraying nozzles 1.
[0040] Figure 6 shows in detail one end of the tubular wall 7a of the rotary support 7 of
either the embodiment of Figures 1, 2, 4 and 5 or the embodiment of Figure 3. Each
end of the tubular wall is supported and guided in a rotational manner with respect
to the structure 8 by a plurality of wheels 13 (only one of which can be seen in Figure
6) rolling on a cylindrical outer surface of the tubular wall 7a. Optionally, a motor
(not shown) is operatively connected to rotate the tubular wall 7a about its longitudinal
axis.
[0041] The inner enclosure of the tubular wall 7a is closed at its ends by end walls 14.
A main liquid product supply tube 15 and a pressurized gas supply tube 16 securely
connected to one another by connection members 21 are installed inside the tubular
wall 7a. Each end of the main liquid product supply tube 15 is surrounded by a jacket
27 going through the corresponding end wall 14 of the tubular wall 7a through a sliding
friction bearing 19. Each end of the pressurized gas supply tube 16 goes through the
end wall 14 of the tubular wall 7a through a corresponding sliding friction bearing
20. The main liquid product supply tube 15 and the pressurized gas supply tube 16
can therefore slide axially with respect to the tubular wall 7a and rotate together
with the tubular wall 7a with respect to the axis thereof.
[0042] The outer ends of the main liquid product supply tube 15 and of the pressurized gas
supply tube 16 are connected to a main liquid product supply source and to a pressurized
gas supply source (not shown), respectively. Advantageously, the pressurized gas can
be pressurized air. Inside the tubular wall 7a, the main liquid product supply tube
15 has a plurality of connectors 17 distributed along same and the pressurized gas
supply tube 16 has a plurality of connectors 18 also distributed along same.
[0043] The connection members 21 support auxiliary liquid product supply tubes 23, 24, each
of which also has a plurality of connectors 25, 26 distributed along same. These auxiliary
liquid product supply tubes 23, 24 can be connected to respective auxiliary liquid
product supply sources (not shown) through respective conduits (not shown) going through
the jacket 27 into an annular space between the main liquid product supply tube 15
and the jacket 27.
[0044] The connection members 21 have a longitudinal support (not shown) fixed thereto where
there are installed a series of sprayer groups (not shown) distributed along the length
of the tubular wall 7a. Each sprayer group includes one of the spraying nozzles 1
associated with one or more valves, and connecting sleeves connect the mentioned connectors
17, 18, 25, 26 to inlet ports of said one or more valves. The liquid product sprayed
by the spraying nozzles 1 is therefore a mixture of main liquid product and pressurized
gas, and optionally other auxiliary liquid products.
[0045] One or more fluid dynamic cylinders 22 are all operatively connected to jointly move
the main liquid product supply tube 15, the pressurized gas supply tube 16, the auxiliary
liquid product supply tubes 23, 24 and the connection members 21 in an axial direction
with respect to the tubular wall 7a.
[0046] A fixed conduit 28 provided with a plurality of nozzles 29 distributed along same
is further installed inside the tubular wall 7a. At least one end of the fixed conduit
28 goes through the end wall 14 through a corresponding hole and is connected to a
cleaning liquid supply source. The nozzles 29 of the fixed conduit 28 are therefore
used to spray cleaning liquid on inner surfaces of the tubular wall 7a and other members
housed therein at the end of an operation for applying a liquid product on paper web.
[0047] Figure 7 shows an alternative embodiment where each of said spraying nozzles 1 is
connected to three conduits supported on the rotary support 7. A first one of said
conduits is a main liquid product supply tube 15 providing the liquid product to be
sprayed. A second one of the conduits is a first pressurized gas supply tube 16a providing
a pressurized gas used to generate a spray jet in combination with the liquid product,
and the third one of the conduits is a second pressurized gas supply tube 16b providing
a pressurized gas to adjust a cone shape of said spray jet. The liquid product supply
tube 15 and the first and second pressurized gas supply tube 16a, 16b are securely
connected to one another and to the rotary support 7 by connection members 21 installed
inside the tubular wall 7a.
[0048] The liquid product supply tube 15 and the first and second pressurized gas supply
tube 16a, 16b are connected to the spraying nozzle 1 by respective connecting sleeves
31, 32, 33. Although not shown in Figure 7, the connection members 21 can further
support auxiliary liquid product supply tubes, analogous to the auxiliary liquid product
supply tubes 23, 24 shown in Figure 6, connected to the spraying nozzles 1 to provide
auxiliary liquid products to be alternatively or simultaneously sprayed.
[0049] Each of the liquid product supply tube 15, first and second pressurized gas supply
tube 16a, 16b and auxiliary liquid product supply tubes has associated thereto regulation
means (not shown) allowing to control a supply pressure of each of the liquids or
gasses in order to project a spray jet on the inner surface of the moving paper web
2 with a controlled speed of impact of the sprayed product and a controlled width
of a cone shape of the sprayed product.
[0050] The scope of the present invention is defined in the attached claims.
1. A spraying device for spraying a liquid product onto a paper web, comprising a spray
chamber (3) delimited at least in part by a moving paper web (2) guided by guide rollers
(6), and a plurality of spraying nozzles (1) connected to a liquid product supply
source and arranged inside said spray chamber (3) to spray said liquid product onto
said moving paper web (2),
characterized in that:
- said plurality of spraying nozzles (1) are arranged on a rotary support (7) rotatable
about a rotation axis parallel to the axes of the guide rollers (6);
- the spray chamber (3) is delimited by at least part of said rotary support (7),
by at least two contiguous sections of the paper web (2), each of said sections of
the paper web being defined between two of said guide rollers (6), and by side walls
(5) perpendicular to the axes of the guide rollers (6); and
- one of said contiguous sections of the paper web (2) faces directly the spraying
nozzles.
2. The spraying device according to claim 1, wherein said spraying nozzles (1) are arranged
according to at least two parallel and adjacent rows of spraying nozzles (1), the
rows being parallel to a plane containing said paper web (2) to be sprayed.
3. The spraying device of claims 2, wherein it comprises at least three rows of spraying
nozzles (1).
4. The spraying device according to claim 2 or 3, wherein the spraying nozzles (1) of
each row are staggered with regard to the spraying nozzles (1) of an adjacent row.
5. The spraying device according to any one of the previous claims, wherein said two
contiguous sections of the paper web (2) together form an angle containing, including
or encompassing the spraying nozzles (1).
6. The spraying device according to any of the previous claims, wherein said side walls
(5) are movable in a direction parallel to the axes of the guide rollers (6) to adjust
the width of the spray chamber (3) to the width of the paper web (2).
7. The spraying device of claims 1, wherein the spraying nozzles (1) are arranged in
a row parallel to said rotation axis of the rotary support (7), and the rotary support
(7) can be rotated with respect to the rotation axis to regulate an spraying angle
of the spraying nozzles (1).
8. The spraying device according to any one of claims 2 to 6, wherein said parallel and
adjacent rows of spraying nozzles (1) are parallel to said rotation axis of the rotary
support (7), and the rotary support (7) can be rotated with respect to an the rotation
axis to regulate an spraying angle of the spraying nozzles (1).
9. The spraying device according to claim 7 or 8, wherein said rotary support (7) includes
a tubular wall (7a) defining an enclosure in which the spraying nozzles are installed,
and said tubular wall (7a) has at least one longitudinal opening (4) through which
the liquid product is sprayed into the spray chamber (3) by the spraying nozzles (1),
at least part of said tubular wall (7a) contributing to delimit the spray chamber
(3).
10. The spraying device according to any one of the previous claims, wherein each of said
spraying nozzles (1) is connected to at least three conduits supported on said support
on which the spraying nozzles (1) are arranged: a first one of said conduits being
a main liquid product supply tube (15) providing a liquid product to be sprayed; a
second one of the conduits being a first pressurized gas supply tube (16a) providing
a pressurized gas to generate a spray jet; and a third one of the conduits being a
second pressurized gas supply tube (16b) providing a pressurized gas to adjust a cone
shape of said spray jet.
11. The spraying device according to claim 10, wherein each of said conduits has associated
regulation means allowing to control a supply pressure of each of the liquids or gasses
in order to project a spray jet on the inner surface of said moving paper web with
a controlled speed of impact of the sprayed product and a controlled width of a cone
shape of the sprayed product.
12. The spraying device according to any of the previous claims, wherein said spraying
nozzles (1) are axially movable along the rotary support (7) in a direction parallel
to the axes of the guide rollers (6).
13. The spraying device according to claim 9, further comprising a cleaning chamber (12)
provided with a plurality of cleaning nozzles (10) connected to a cleaning liquid
supply source, where said cleaning chamber (12) is located outside the spray chamber
(3) and outside the tubular wall (7a) of the rotary support (7), and where said rotary
support (7) can be rotated to an angular cleaning position in which the longitudinal
opening (4) of the tubular wall (7a) is facing the cleaning chamber (12) and the spraying
nozzles (1) are facing said cleaning nozzles (10).
14. The spraying device according to claim 13, wherein said cleaning chamber (12) includes
cleaning brushes (30) that interfere with the spraying nozzles (1).
15. The spraying device according to claim 1, wherein at least two of the guide rollers
(6) are arranged adjacent to the tubular wall (7a) of the rotary support (7), and
at least one of the guide rollers (6) adjacent to the tubular wall (7a) of the rotary
support (7) can be moved in a direction perpendicular to its own axis to facilitate
access to the spray chamber (3).
1. Sprühvorrichtung zum Versprühen eines flüssigen Produkts auf einem Papierbogen, umfassend
eine Sprühkammer (3), welche mindestens teilweise durch einen sich bewegenden Papierbogen
(2) abgegrenzt ist, welcher durch Führungsrollen (6) geführt wird, und eine Vielzahl
von Sprühdüsen (1), welche mit einer Versorgungsquelle eines flüssigen Produkts verbunden
sind und innerhalb der genannten Sprühkammer (3) angeordnet sind, um das genannte
flüssige Produkt auf dem genannten sich bewegenden Papierbogen (2) zu versprühen,
dadurch gekennzeichnet, dass:
- die genannte Vielzahl von Sprühdüsen (1) auf einem drehbaren Träger (7) angeordnet
sind, welcher sich um eine Drehachse parallel zu den Achsen der Führungsrollen (6)
drehen kann;
- die Sprühkammer (3) durch mindestens einen Teil des genannten drehbaren Trägers
(7), durch mindestens zwei benachbarte Abschnitte des Papierbogens (2), wobei jeder
der genannten Abschnitte des Papierbogens zwischen zwei der genannten Führungsrollen
(6) definiert ist, und durch Seitenwände (5), welche senkrecht zu den Achsen der Führungsrollen
(6) sind, abgegrenzt ist; und
- einer der genannten benachbarten Abschnitte des Papierbogens (2) den Sprühdüsen
direkt gegenüberstehen.
2. Sprühvorrichtung nach Anspruch 1, wobei die genannten Sprühdüsen (1) gemäß mindestens
zwei parallele und benachbarte Reihen von Sprühdüsen (1) angeordnet sind, wobei die
Reihen parallel zu einer Ebene sind, welche den genannten zu versprühenden Papierbogen
(2) beinhaltet.
3. Sprühvorrichtung nach Anspruch 2, wobei sie mindestens drei Reihen von Sprühdüsen
(1) umfasst.
4. Sprühvorrichtung nach Anspruch 2 oder 3, wobei die Sprühdüsen (1) jeder Reihe in Bezug
auf die Sprühdüsen (1) einer benachbarten Reihe versetzt sind.
5. Sprühvorrichtung nach einem der vorhergehenden Ansprüche, wobei die zwei benachbarten
Abschnitte des Papierbogens (2) zusammen einen Winkel einschließen, in welche, die
Sprühdüsen (1) beinhaltet, enthalten oder umfasst sind.
6. Sprühvorrichtung nach einem der vorhergehenden Ansprüche, wobei die genannten Seitenwände
(5) in einer zu den Achsen der Führungsrollen (6) parallelen Richtung beweglich sind,
um die Breite der Sprühkammer (3) auf die Breite des Papierbogens (2) einzustellen.
7. Sprühvorrichtung nach Anspruch 1, wobei die Sprühdüsen (1) in einer zur genannten
Drehachse des drehbaren Trägers (7) parallelen Reihe angeordnet sind, und der drehbare
Träger (7) in Bezug auf die Drehachse gedreht werden kann, um einen Sprühwinkel der
Sprühdüsen (1) zu regulieren.
8. Sprühvorrichtung nach einem der Ansprüche 2 bis 6, wobei die genannten parallelen
und benachbarten Reihen von Sprühdüsen (1) parallel zur genannten Drehachse des drehbaren
Trägers (7) sind, und der drehbare Träger (7) in Bezug auf die Drehachse gedreht werden
kann, um einen Sprühwinkel der Sprühdüsen (1) zu regulieren.
9. Sprühvorrichtung nach Anspruch 7 oder 8, wobei der genannte drehbare Träger (7) eine
rohrförmige Wand (7a) enthält, welche ein Gehäuse definiert, in welchem die Sprühdüsen
installiert sind, und die genannte rohrförmige Wand (7a) mindestens eine längliche
Öffnung (4) aufweist, durch welche das flüssige Produkt in die Sprühkammer (3) mittels
der Sprühdüsen (1) versprüht wird, wobei mindestens einen Teil der genannten rohrförmigen
Wand (7a) zur Abgrenzung der Sprühkammer (3) beiträgt.
10. Sprühvorrichtung nach einem der vorhergehenden Ansprüche, wobei jede der genannten
Sprühdüsen (1) mit mindestens drei Leitungen verbunden ist, welche auf dem genannten
Träger, auf dem die Sprühdüsen (1) angeordnet sind, abgestützt sind: wobei die erste
der genannten Leitungen ein Hauptversorgungsrohr (15) eines flüssigen Produkts ist,
welches ein flüssiges zu versprühendes Produkt bereitstellt; wobei die zweite der
Leitungen ein erstes Versorgungsrohr (16a) für Druckgas ist, welches ein Druckgas
bereitstellt, um einen Sprühstrahl zu erzeugen; und wobei die dritte der Leitungen
ein zweites Versorgungsrohr (16b) für Druckgas ist, welches ein Druckgas bereitstellt,
um eine Kegelform des genannten Sprühstrahls einzustellen.
11. Sprühvorrichtung nach Anspruch 10, wobei jede der genannten Leitungen assoziierte
Regelmittel aufweist, welche die Steuerung eines Versorgungsdrucks jeder der Flüssigkeiten
oder Gase ermöglichen, um einen Sprühstrahl auf der Innenfläche des genannten sich
bewegenden Papierbogens mit einer kontrollierten Auftreffgeschwindigkeit des versprühten
Produkts und einer kontrollierten Breite einer Kegelform des versprühten Produkts
aufzusprühen.
12. Sprühvorrichtung nach einem der vorhergehenden Ansprüche, wobei die genannten Sprühdüsen
(1) entlang des drehbaren Trägers (7) in einer zu den Achsen der Führungsrollen (6)
parallelen Richtung, axial beweglich sind.
13. Sprühvorrichtung nach Anspruch 9, zusätzlich umfassend eine Reinigungskammer (12),
welche mit einer Vielzahl von Reinigungsdüsen (10) versehen ist, welche mit einer
Versorgungsquelle einer Reinigungsflüssigkeit verbunden sind, wobei die genannte Reinigungskammer
(12) außerhalb der Sprühkammer (3) und außerhalb der rohrförmigen Wand (7a) des drehbaren
Trägers (7) liegt, und wobei der genannte drehbare Träger (7) zu einer winkeligen
Reinigungsposition gedreht werden kann, in welcher die längliche Öffnung (4) der rohrförmigen
Wand (7a) der Reinigungskammer (12) gegenübersteht und die Sprühdüsen (1) den genannten
Reinigungsdüsen (10) gegenüberstehen.
14. Sprühvorrichtung nach Anspruch 13, wobei die genannte Reinigungskammer (12) Reinigungsbürsten
(30) enthält, welche mit den Sprühdüsen (1) zusammenwirken.
15. Sprühvorrichtung nach Anspruch 1, wobei mindestens zwei der Führungsrollen (6) benachbart
zur rohrförmigen Wand (7a) des drehbaren Trägers (7) angeordnet sind, und mindestens
eine der der rohrförmigen Wand (7a) des drehbaren Trägers (7) benachbarten Führungsrollen
(6) in einer zu dessen eigenen Achse senkrechten Richtung bewegt werden kann, um den
Zugang zur Sprühkammer (3) zu erleichtern.
1. Un dispositif de vaporisation pour vaporiser un produit liquide sur un rouleau de
papier, comportant une chambre de vaporisation (3) délimitée au moins en partie pour
un rouleau de papier mobile (2) guidé par des rouleaux de guidage (6) et une pluralité
de buses de vaporisation (1) reliées à une source d'alimentation d'un produit liquide
et aménagé à l'intérieur de cette chambre de vaporisation (3) pour vaporiser ce produit
liquide sur ce rouleau de papier mobile (2),
caractérisé en ce que :
- cette pluralité de buses de vaporisation (1) est aménagée sur un support rotatoire
(7) tournant autour d'un axe de rotation parallèle aux axes des rouleaux de guidage
(6) ;
- la chambre de vaporisation (3) est délimitée par au moins une partie de ce support
rotatoire (7), par au moins deux sections contigües du rouleau de papier (2), chacune
de ces sections du rouleau de papier étant définies entre deux de ces rouleaux de
guidage (6) et par des parois latérales (5) perpendiculaires aux axes des rouleaux
de guidage (6) ; et
- une de ces sections contigües du rouleau de papier (2) fait directement face aux
buses de vaporisation.
2. Le dispositif de vaporisation conformément à la revendication 1, dans lequel ces buses
de vaporisation (1) sont agencées conformément à au moins deux rangées parallèles
et adjacentes de buses de vaporisation (1), les rangées étant parallèles à un plan
contenant ce rouleau de papier (2) à vaporiser.
3. Le dispositif de vaporisation de la revendication 2, dans lequel il comporte au moins
trois rangées de buses de vaporisation (1).
4. Le dispositif de vaporisation conformément à la revendication 2 ou 3, dans lequel
les buses de vaporisation (1) de chaque rangée sont décalées par rapport aux buses
de vaporisation (1) d'une rangée adjacente.
5. Le dispositif de vaporisation conformément à une quelconque des revendications précédentes,
dans lequel ces deux sections contigües du rouleau de papier (2) ensembles forment
un angle contenant, comprenant ou enveloppant les buses de vaporisation (1).
6. Le dispositif de vaporisation conformément à une quelconque des revendications précédentes,
dans lequel ces parois latérales (5) sont mobiles dans un sens parallèle aux axes
des rouleaux de guidage (6) pour régler la largeur de la chambre de vaporisation (3)
à la largeur du rouleau de papier (2).
7. Le dispositif de vaporisation de la revendication 1, dans lequel les buses de vaporisation
(1) sont aménagées en une rangée parallèle à cet axe de rotation du support rotatoire
(7) et le support rotatoire (7) peut tourner par rapport à l'axe de rotation pour
régler un angle de vaporisation des buses de vaporisation (1).
8. Le dispositif de vaporisation conformément à une quelconque des revendications 2 à
6, dans lequel ces rangées parallèles et adjacentes de buses de vaporisation (1) sont
parallèles à cet axe de rotation du support rotatoire (7) et le support rotatoire
(7) peut tourner par rapport à l'axe de rotation pour régler un angle de vaporisation
des buses de vaporisation (12).
9. Le dispositif de vaporisation conformément à la revendication 7 ou 8, dans lequel
ce support rotatoire (7) comprend une paroi tubulaire (7a) définissant une enceinte
dans laquelle les buses de vaporisation sont installées, et cette paroi tubulaire
(7a) a au moins une ouverture longitudinale (4) à travers laquelle le produit liquide
est vaporisé dans la chambre de vaporisation (3) par les buses de vaporisation (1),
au moins une partie de cette paroi tubulaire (7a) contribuant à délimiter la chambre
de vaporisation (3).
10. Le dispositif de vaporisation conformément à une quelconque des revendications précédentes,
dans lequel chacune de ces buses de vaporisation (1) est reliée à au moins trois conduits
appuyés sur ce support sur lequel les buses de vaporisation (1) sont aménagées : un
premier de ces conduits étant un tuyau (15) d'alimentation principal de produit liquide
fournissant un produit liquide à vaporiser ; une deuxième des conduits étant un premier
tuyau (16a) d'alimentation de gaz sous pression fournissant un gaz sous pression pour
générer un jet de vaporisation ; et un troisième des conduits étant un deuxième tuyau
(16b) d'alimentation de gaz sous pression fournissant un gaz sous pression pour régler
une forme conique de ce jet de vaporisation.
11. Le dispositif de vaporisation conformément à la revendication 10, dans lequel chacun
de ces conduits a des moyens de réglage associés permettant de contrôler une pression
d'alimentation de chacun des liquides ou gaz afin de projeter un jet de vaporisation
sur la surface intérieure de ce rouleau en papier mobile avec une vitesse contrôlée
de l'impact du produit vaporisé et une largeur contrôlée d'une forme conique du produit
vaporisé.
12. Le dispositif de vaporisation conformément à une quelconque des revendications précédentes,
dans lequel ces buses de vaporisation (1) sont axialement mobiles le long du support
rotatoire (7) dans un sens parallèle aux axes des rouleaux de guidage (6).
13. Le dispositif de vaporisation conformément à la revendication 9, comportant en plus
une chambre de nettoyage (12) pourvue d'une pluralité de buses de nettoyage (10) reliées
à une source d'alimentation de liquide de nettoyage, dans lequel cette chambre de
nettoyage (12) est située à l'extérieur de la chambre de vaporisation (3) et à l'extérieur
de la paroi tubulaire (7a) du support rotatoire (7) et dans lequel ce support rotatoire
(7) peut tourner à une position de nettoyage angulaire dans laquelle l'ouverture longitudinale
(4) de la paroi tubulaire (7a) fait face à la chambre de nettoyage (12) et les buses
de vaporisation (1) font face à ces buses de nettoyage (10).
14. Le dispositif de vaporisation conformément à la revendication 13, dans lequel cette
chambre de nettoyage (12) comporte des brosses (30) qui sont en collision avec les
buses de vaporisation (1).
15. Le dispositif de nettoyage conformément à la revendication 1, dans lequel au moins
deux des rouleaux de guidage (6) sont aménagés adjacents à la paroi tubulaire (7a)
sur le support rotatoire (7) et au moins un des rouleaux de guidage (6) adjacent à
la paroi tubulaire (7a) du support rotatoire (7) peut être déplacé dans le sens perpendiculaire
à son propre axe pour faciliter l'accès à la chambre de vaporisation (3).