CA2010130A1 - Arrangement of nozzles with "negative pressure intended for treatment of mobile material webs - Google Patents
Arrangement of nozzles with "negative pressure intended for treatment of mobile material websInfo
- Publication number
- CA2010130A1 CA2010130A1 CA 2010130 CA2010130A CA2010130A1 CA 2010130 A1 CA2010130 A1 CA 2010130A1 CA 2010130 CA2010130 CA 2010130 CA 2010130 A CA2010130 A CA 2010130A CA 2010130 A1 CA2010130 A1 CA 2010130A1
- Authority
- CA
- Canada
- Prior art keywords
- nozzle
- face
- guide
- web
- plane
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
- F26B13/10—Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
- F26B13/101—Supporting materials without tension, e.g. on or between foraminous belts
- F26B13/104—Supporting materials without tension, e.g. on or between foraminous belts supported by fluid jets only; Fluid blowing arrangements for flotation dryers, e.g. coanda nozzles
Abstract
A NOZZLE BOX HAVING NEGATIVE PRESSURE NOZZLES
FOR TREATMENT OF MOBILE MATERIAL WEBS
ABSTRACT OF THE DISCLOSURE
An arrangement of nozzles with negative pressure intended for contact-free treatment of mobile material webs (W), comprises a nozzle box provided with a foil face (16; 16, 16T) placed facing the web (W), in connection with which face there are two nozzle slots (17, 18). The nozzle box (10) has a planar carrier face (16), at one of whose edges there is a curved Coanda air-guide face (16R), in connection with which there is the first nozzle (17), at which the initial direction (S0) of its blowing is perpendicular to the plane of the web (W). The Coanda air-guide face (16R) turns the air blow (v1) that comes from the first nozzle (17) towards the direction of the carrier face (16) and of the plane of the web (W) running over the carrier face. In the lateral area of the planar carrier face (16) opposite in relation to the first nozzle (17), there is a substantially planar guide face (16) or guide wing (16T), which extends said planar carrier face (16) continuously. The guide face (16a) is parallel to the plane of the carrier face (16) or, when a guide wing (16T) is used, starting from the plane (16) of the carrier face, to some extent inclined (angle a) towards the web (W). In connection with, or at the proximity of, the outer edge (20) of said guide face (16a) or guide wing (16T) there is a second blow nozzle (18), whose direction (v2) is parallel to the guide wing (16T) of the guide face (16a).
FOR TREATMENT OF MOBILE MATERIAL WEBS
ABSTRACT OF THE DISCLOSURE
An arrangement of nozzles with negative pressure intended for contact-free treatment of mobile material webs (W), comprises a nozzle box provided with a foil face (16; 16, 16T) placed facing the web (W), in connection with which face there are two nozzle slots (17, 18). The nozzle box (10) has a planar carrier face (16), at one of whose edges there is a curved Coanda air-guide face (16R), in connection with which there is the first nozzle (17), at which the initial direction (S0) of its blowing is perpendicular to the plane of the web (W). The Coanda air-guide face (16R) turns the air blow (v1) that comes from the first nozzle (17) towards the direction of the carrier face (16) and of the plane of the web (W) running over the carrier face. In the lateral area of the planar carrier face (16) opposite in relation to the first nozzle (17), there is a substantially planar guide face (16) or guide wing (16T), which extends said planar carrier face (16) continuously. The guide face (16a) is parallel to the plane of the carrier face (16) or, when a guide wing (16T) is used, starting from the plane (16) of the carrier face, to some extent inclined (angle a) towards the web (W). In connection with, or at the proximity of, the outer edge (20) of said guide face (16a) or guide wing (16T) there is a second blow nozzle (18), whose direction (v2) is parallel to the guide wing (16T) of the guide face (16a).
Description
2Q~Ol~
13ACKGROUND OF TNE__NVENTION
The invention concerns an arrangement of nozzles with negative pressure intended for contact-free treatment of mobile material webs, comprising a nozzle box provided with a foil face placed facing the web, in connection with which face there are two nozzle slots, and the construction of which said nozzle arrangement is asymmetric relative to the perpendicular center plane of its negatively pressurized carrier face.
The nozzle arrangement subject of the invention is intended for contact-free supporting and treatment~ such as, e.g., drying, heating or cooling, of paper webs etc. continuous webs.
The prior-art apparatuses based on contact-free treatment of the web consist of a number of nozzle boxes, out of whose nozzles a gas flow that s~pports and dries the web is directed at the web.
The nozzles in said apparatuses can be divided into two groups: nozzles with positive pressure (float nozzles) and nozzles with negative pressure (foil nozzles). The operation of the nozzles -.,: . :
with positive pressure is based on the air-cushion principle. The nozzles with negative pressure attract the web and stabilize the run of the web, in which case the attractive force applied to the web is, as is well known, based on a gas flow field parallel to the web, said field forming a static negative pressure between the web and the carrying face of the nozzle.
Both in nozzles with positive pressure and in those with negative pressure, the so-called Coanda effect is commonly used to -guide air in the desired direction.
With respect to the prior art related to the present invention, reference is made to the Applicant's FI Patent No. 68,723 (equivalent of U.S. Patent 4,247,993), wherein a nozzle with negative / ~/~G
Gl. ~ f~
/ q ~z 1 ~, 9 j ~
~01~)13`0 pressure is described which is mainly characterized in that, in the direction of flow of the gas, the nozzle slot of the nozzle with negative pressure is placed before the plane of the inlet edge of the curved guide face and that the ratio of the width of the nozzle slot to the curved radius of said guide face is, with the gas flow rates occurring in practice, chosen so that the gas flow is separated from the curved guide face substantially before this trailing edge.
~ he prior art most closely related to the present invention is represented by the arranqement of nozzles with positive pressure described in the Applicant's FI Pat. Appl. No. 874255, in connection with which there are two nozzle slots that blow substantially against each other. In the last-mentioned FI patent application it has been -considexed novel that the arrangement of nozzles has a first nozzle slot, which is placed relative to the carrying face in such a way that the gas jet blown out of the nozzle slot follows in contact the curved carrying face up to the area between the nozzle slots and that the arrangement of nozzles includes a second nozzle slot, which is placed within the area of the edge of the curved guide face placed in its connection or, in the gas flow direction, before said edge, the ratio of the width of said second nozzle slot to the curved radius of said guide face being chosen such, with the flow rates of the second nozzle occurring in practice, that the gas flow is separated from the curved guide face of the second nozzle preferably before the carrying-face area proper between the first and the second nozzle slot.
O~JECTB AND 8UMMARY OF THE INVENTION
The object of the present invention is further development of the nozzle arrangements described in the Applicant's patents and applications mentioned above while making ~se of the practical : ` :
201~130 experience obtained by the Applicant with different nozzles and with combinations of the latter.
A particular object of the invention is to provide a nozzle with negative pressure, i.e. a foil nozzle, that has a good web-aligning ability so that in a contact-free air-support apparatus consisting of nozzles in accordance with the invention, formation of folds in the web can be reduced. This object is also associated with the object of providing a nozzle arrangement by whose means the web edge supported by air runs calmly, which is achieved partly in that the difference in air pressures between opposite sides of the web is made relatively small.
A further object of the invention is to provide a nozzle arrangement that has a wide range of blow rates, even as wide as -~
15...85 m/s, which means flexibility of operation.
A further object of the invention is to provide a foil nozzle that has an evaporating capacity higher than in the prior art.
Another object of the invention is to provide a noxzle that can be used both with upstream blowing and with downstream blowing.
In view of achieving the ob;ections stated above and those that will come out laterr the invention is mainly characterized in that the nozzle box has a substantially plane carrier face, at one of whose edges there is a curved Coanda air-guide face, in connection with which there is the first nozzle of the nozzle arrangement, at which the initial direction of its blowing is substantially perpendicular to the plane of the web to be carried, that said Coanda air-guide is arranged to turn the air blow that comes from the first nozzle towards the direction of the carrier face and of the plane of the web running over the carrier face, that in the lateral area of , said plane carrier face opposite to the first nozzle, there is a substantially planar guide face or guide wing, which extends said planar carrier face continuously, that said guide face is parallel to the plane of the carrier face or, when a guide wing is used, it is, starting from the plane of the carrier face, to some extent inclined towards the web, and that in connection with, or at the proximity of, the outer edge of said guide face or guide wing there is a second blow nozzle, whose direction is parallel to the guide wing of said guide face.
In the nozzle in accordance with the invention, no field of positive pressure is formed, which would cause folds in the web, thereby deteriorating the running quality. By dimensioning the nozzles in accordance with the invention and the carrier faces as well as the air velocities it is possible by means of the invention to accomplish both good transfer of heat and improved running ~uality of the web.
In an attempt to achieve a maximal transfer of heat, in the nozzles a blowing in a direction contrary to the direction of running of the web is used.
In the following the invention will be described in detail with reference to an advantageously exemplifying embodiment of the invention illustrated in the figure in the accompanying drawing, the invention being not strictly confined to the details of said embodiment. -~
The figure is a vertical sectional view of a preferred exemplifying embodiment of the geometry of a nozzle in accordance with the invention.
, .;
' ', .
2Q~0~3~
The nozzle arrangement in accordance with the figure comprises a nozzle box 10, out of whose interior the gas blown through the openings 11 is passed into the spaces 12 and 13 in the nozzle box, said spaces being defined between the inner walls 14, 15 and the outer walls 21 and 26 of the nozzle. The inner wall 14 is curved at its upper edge towards the carrier face 16, being substantially shaped as an arc of a circle (radius Rl). The nozzle box 10 has a planar carrier face 16, over which the web W runs as supported free of contact. From one side, the first nozzle 17 is defined b~ the curved wall 16R (curve radius R1), which qoes on continuously as a planar carrier face 16. In a preferred embodiment of the invention, the curve radius of the curved guide face of the first nozzle 17 is within the range of Rl = 10...35 mm. From the other side the first nozzle is defined by the edge plate 24. The walls 14 and 21 of the lateral ducts 12 are interconnected by intermediate parts 23.
The direction blowing SO of the first nozzle 17 is perpendicular to the plane of the web W to be supported. The blowing out of the first nozzle 17 is turned on the basis of the Coanda effect, being guided by the curved guide fàce 16R, maximally about 70-, whereupon th~e blowing,~which is illustrated in the figure by the vector v1 is directed to some extent towards the web W so that the blowing vl has a larger speed component vl~ parallel to the plane of the carrier face 16 of the web W as compared with the perpendicular speed component vlh.
In the connection described above, the novelty of the invention is the arrangement and direction of the second nozzle 18.
The second nozzle 18 is opened into the space 13, into which the air -.~ . .
i8 passed from the interior of the nozzle box 10 through the slot 11. ~ ~ ~
.~' : ~ :
-5~
ZO~L0130 From the side of the web W, the second nozzle 18 is defined by the plane end 16a of the carrier face, or by a guide wing 16T
(illustrated with dashed lines) bent out of it. The guide wing 16T, if used, is a continuous and direct extension of the carrier face 16. The guide wing 16T "rises" ~rom the carrier face 16 so that the "difference in height" between the guide wing 16T and the plane carrier face 16 is hl ~ 0...3 mm, most appropriately h ~ 1.0 mm.
The length L of the wing 16T in the direction of running of the web W
is L ~ 2...20 mm, most appropriately L 2Y 5 mm.
In some special cases the guide wing 16T may be slightly convex or concave when seen from the side of the web W, which is, however, as a rule, not advantageous. The guide wing 16T directs the second blowing v2 towards the web W in a direction substantially parallel to its plane.
From the second nozzle 18, which is placed underneath the edge 20 of the guide wing 16T and which extends across the entire width of the web W, the blowing v2 is directed substantially in the direction of the plane of the web W. The direction of the blowing V2 forms advantageously a small angle a in relation to the web W
~ : . .. .
plane facing it. Under these circumstances, the blowing v~ always has a considerably large speed component v2h parallel to the plane , ~
of the web W and a speed component v2h, which is perpendicular to the web W and directed towards the web and which is equal to zero or more appropriately quite small. The angle a is, as a rule, chosen within the range of a = 0... 90-, most appropriately a = 0... 15-. The ~;
plane carrier face 16 and the guide wing 16T, if any, rising towards the plane of the web W together form an air-support face in whose area a negatively pressurized foil zone K is formed that guides the ~ -web W.
i - :, The magnitude s1 of the first nozzle slot 17 is most appropriately within the range of S1 = 1.5...3.0 mm. In a corresponding way, the magnitude S2 of the second nozzle slot 18 is S2 = 1.5...2.5 mm, most appropriately s2 ~ 2 mm. The air velocities v1 and v2 in the first and the second nozzle 17, 18 are, as a rule, within the range of 15...85 m/s. These velocities can be adjusted to be of different magnitudes compared with one another (vl ~ v2) with a view to optimizing the operation o~ the nozzle arrangement.
Even though, above, nozzle slots have been spoken of, it is understood that, in some special cases it is possible to use a corresponding series of nozzle holes or series of nozzle slots.
By means of the speeds components vlv and v2v parallel to the plane of the web W of the blowings vl and v2, a stable control of the web W is achieved, whereas by means of the speed component v1h or by means of the speed components v1h and v2h directed towards the web breaking of the boundary layer and improvement of the coefficient of heat transfer are achieved.
Depending on whether, in the field of application of the invention the main emphasis is on stable running of the web or on maximization of the heat transfer coefficient (efficiency of drying), a blowing applied`to the web either downstream or upstream is applied. In some special cases, it is also possible to apply the ~;
invention such that in subsequent nozzle boxes or groups of nozzle boxes directions of blowing contrary to one another are used in ad~acent boxes. ~ -The apparatuses of drying and supporting in practice comprise several nozzle boxes 10 similar to that illustrated in the figure, extending across the entire width of the web W and fitted one after ':
the other, said boxes 10 comprising intermediate spaceR through which air is sucked as exhaust air or for circulation. The subsequent nozzle boxes 10 are attached, e.g., to a common support plate 30, the blow air being introduced through openings 31 provided in said plate 30 and through related air ducts, in the direction of the arrows A, into the nozzle boxes 10, and the air being distributed out of said boxes through the openings 11 into the spaces 12 and 13 and from these further into the nozzle slots 17 and 1~ which extend across the entire width of the web W.
In the following, the patent claims will be given, whereby the various details of the invention may show variation within the scope of the inventive idea defined in said claims and may differ from the details given above.
13ACKGROUND OF TNE__NVENTION
The invention concerns an arrangement of nozzles with negative pressure intended for contact-free treatment of mobile material webs, comprising a nozzle box provided with a foil face placed facing the web, in connection with which face there are two nozzle slots, and the construction of which said nozzle arrangement is asymmetric relative to the perpendicular center plane of its negatively pressurized carrier face.
The nozzle arrangement subject of the invention is intended for contact-free supporting and treatment~ such as, e.g., drying, heating or cooling, of paper webs etc. continuous webs.
The prior-art apparatuses based on contact-free treatment of the web consist of a number of nozzle boxes, out of whose nozzles a gas flow that s~pports and dries the web is directed at the web.
The nozzles in said apparatuses can be divided into two groups: nozzles with positive pressure (float nozzles) and nozzles with negative pressure (foil nozzles). The operation of the nozzles -.,: . :
with positive pressure is based on the air-cushion principle. The nozzles with negative pressure attract the web and stabilize the run of the web, in which case the attractive force applied to the web is, as is well known, based on a gas flow field parallel to the web, said field forming a static negative pressure between the web and the carrying face of the nozzle.
Both in nozzles with positive pressure and in those with negative pressure, the so-called Coanda effect is commonly used to -guide air in the desired direction.
With respect to the prior art related to the present invention, reference is made to the Applicant's FI Patent No. 68,723 (equivalent of U.S. Patent 4,247,993), wherein a nozzle with negative / ~/~G
Gl. ~ f~
/ q ~z 1 ~, 9 j ~
~01~)13`0 pressure is described which is mainly characterized in that, in the direction of flow of the gas, the nozzle slot of the nozzle with negative pressure is placed before the plane of the inlet edge of the curved guide face and that the ratio of the width of the nozzle slot to the curved radius of said guide face is, with the gas flow rates occurring in practice, chosen so that the gas flow is separated from the curved guide face substantially before this trailing edge.
~ he prior art most closely related to the present invention is represented by the arranqement of nozzles with positive pressure described in the Applicant's FI Pat. Appl. No. 874255, in connection with which there are two nozzle slots that blow substantially against each other. In the last-mentioned FI patent application it has been -considexed novel that the arrangement of nozzles has a first nozzle slot, which is placed relative to the carrying face in such a way that the gas jet blown out of the nozzle slot follows in contact the curved carrying face up to the area between the nozzle slots and that the arrangement of nozzles includes a second nozzle slot, which is placed within the area of the edge of the curved guide face placed in its connection or, in the gas flow direction, before said edge, the ratio of the width of said second nozzle slot to the curved radius of said guide face being chosen such, with the flow rates of the second nozzle occurring in practice, that the gas flow is separated from the curved guide face of the second nozzle preferably before the carrying-face area proper between the first and the second nozzle slot.
O~JECTB AND 8UMMARY OF THE INVENTION
The object of the present invention is further development of the nozzle arrangements described in the Applicant's patents and applications mentioned above while making ~se of the practical : ` :
201~130 experience obtained by the Applicant with different nozzles and with combinations of the latter.
A particular object of the invention is to provide a nozzle with negative pressure, i.e. a foil nozzle, that has a good web-aligning ability so that in a contact-free air-support apparatus consisting of nozzles in accordance with the invention, formation of folds in the web can be reduced. This object is also associated with the object of providing a nozzle arrangement by whose means the web edge supported by air runs calmly, which is achieved partly in that the difference in air pressures between opposite sides of the web is made relatively small.
A further object of the invention is to provide a nozzle arrangement that has a wide range of blow rates, even as wide as -~
15...85 m/s, which means flexibility of operation.
A further object of the invention is to provide a foil nozzle that has an evaporating capacity higher than in the prior art.
Another object of the invention is to provide a noxzle that can be used both with upstream blowing and with downstream blowing.
In view of achieving the ob;ections stated above and those that will come out laterr the invention is mainly characterized in that the nozzle box has a substantially plane carrier face, at one of whose edges there is a curved Coanda air-guide face, in connection with which there is the first nozzle of the nozzle arrangement, at which the initial direction of its blowing is substantially perpendicular to the plane of the web to be carried, that said Coanda air-guide is arranged to turn the air blow that comes from the first nozzle towards the direction of the carrier face and of the plane of the web running over the carrier face, that in the lateral area of , said plane carrier face opposite to the first nozzle, there is a substantially planar guide face or guide wing, which extends said planar carrier face continuously, that said guide face is parallel to the plane of the carrier face or, when a guide wing is used, it is, starting from the plane of the carrier face, to some extent inclined towards the web, and that in connection with, or at the proximity of, the outer edge of said guide face or guide wing there is a second blow nozzle, whose direction is parallel to the guide wing of said guide face.
In the nozzle in accordance with the invention, no field of positive pressure is formed, which would cause folds in the web, thereby deteriorating the running quality. By dimensioning the nozzles in accordance with the invention and the carrier faces as well as the air velocities it is possible by means of the invention to accomplish both good transfer of heat and improved running ~uality of the web.
In an attempt to achieve a maximal transfer of heat, in the nozzles a blowing in a direction contrary to the direction of running of the web is used.
In the following the invention will be described in detail with reference to an advantageously exemplifying embodiment of the invention illustrated in the figure in the accompanying drawing, the invention being not strictly confined to the details of said embodiment. -~
The figure is a vertical sectional view of a preferred exemplifying embodiment of the geometry of a nozzle in accordance with the invention.
, .;
' ', .
2Q~0~3~
The nozzle arrangement in accordance with the figure comprises a nozzle box 10, out of whose interior the gas blown through the openings 11 is passed into the spaces 12 and 13 in the nozzle box, said spaces being defined between the inner walls 14, 15 and the outer walls 21 and 26 of the nozzle. The inner wall 14 is curved at its upper edge towards the carrier face 16, being substantially shaped as an arc of a circle (radius Rl). The nozzle box 10 has a planar carrier face 16, over which the web W runs as supported free of contact. From one side, the first nozzle 17 is defined b~ the curved wall 16R (curve radius R1), which qoes on continuously as a planar carrier face 16. In a preferred embodiment of the invention, the curve radius of the curved guide face of the first nozzle 17 is within the range of Rl = 10...35 mm. From the other side the first nozzle is defined by the edge plate 24. The walls 14 and 21 of the lateral ducts 12 are interconnected by intermediate parts 23.
The direction blowing SO of the first nozzle 17 is perpendicular to the plane of the web W to be supported. The blowing out of the first nozzle 17 is turned on the basis of the Coanda effect, being guided by the curved guide fàce 16R, maximally about 70-, whereupon th~e blowing,~which is illustrated in the figure by the vector v1 is directed to some extent towards the web W so that the blowing vl has a larger speed component vl~ parallel to the plane of the carrier face 16 of the web W as compared with the perpendicular speed component vlh.
In the connection described above, the novelty of the invention is the arrangement and direction of the second nozzle 18.
The second nozzle 18 is opened into the space 13, into which the air -.~ . .
i8 passed from the interior of the nozzle box 10 through the slot 11. ~ ~ ~
.~' : ~ :
-5~
ZO~L0130 From the side of the web W, the second nozzle 18 is defined by the plane end 16a of the carrier face, or by a guide wing 16T
(illustrated with dashed lines) bent out of it. The guide wing 16T, if used, is a continuous and direct extension of the carrier face 16. The guide wing 16T "rises" ~rom the carrier face 16 so that the "difference in height" between the guide wing 16T and the plane carrier face 16 is hl ~ 0...3 mm, most appropriately h ~ 1.0 mm.
The length L of the wing 16T in the direction of running of the web W
is L ~ 2...20 mm, most appropriately L 2Y 5 mm.
In some special cases the guide wing 16T may be slightly convex or concave when seen from the side of the web W, which is, however, as a rule, not advantageous. The guide wing 16T directs the second blowing v2 towards the web W in a direction substantially parallel to its plane.
From the second nozzle 18, which is placed underneath the edge 20 of the guide wing 16T and which extends across the entire width of the web W, the blowing v2 is directed substantially in the direction of the plane of the web W. The direction of the blowing V2 forms advantageously a small angle a in relation to the web W
~ : . .. .
plane facing it. Under these circumstances, the blowing v~ always has a considerably large speed component v2h parallel to the plane , ~
of the web W and a speed component v2h, which is perpendicular to the web W and directed towards the web and which is equal to zero or more appropriately quite small. The angle a is, as a rule, chosen within the range of a = 0... 90-, most appropriately a = 0... 15-. The ~;
plane carrier face 16 and the guide wing 16T, if any, rising towards the plane of the web W together form an air-support face in whose area a negatively pressurized foil zone K is formed that guides the ~ -web W.
i - :, The magnitude s1 of the first nozzle slot 17 is most appropriately within the range of S1 = 1.5...3.0 mm. In a corresponding way, the magnitude S2 of the second nozzle slot 18 is S2 = 1.5...2.5 mm, most appropriately s2 ~ 2 mm. The air velocities v1 and v2 in the first and the second nozzle 17, 18 are, as a rule, within the range of 15...85 m/s. These velocities can be adjusted to be of different magnitudes compared with one another (vl ~ v2) with a view to optimizing the operation o~ the nozzle arrangement.
Even though, above, nozzle slots have been spoken of, it is understood that, in some special cases it is possible to use a corresponding series of nozzle holes or series of nozzle slots.
By means of the speeds components vlv and v2v parallel to the plane of the web W of the blowings vl and v2, a stable control of the web W is achieved, whereas by means of the speed component v1h or by means of the speed components v1h and v2h directed towards the web breaking of the boundary layer and improvement of the coefficient of heat transfer are achieved.
Depending on whether, in the field of application of the invention the main emphasis is on stable running of the web or on maximization of the heat transfer coefficient (efficiency of drying), a blowing applied`to the web either downstream or upstream is applied. In some special cases, it is also possible to apply the ~;
invention such that in subsequent nozzle boxes or groups of nozzle boxes directions of blowing contrary to one another are used in ad~acent boxes. ~ -The apparatuses of drying and supporting in practice comprise several nozzle boxes 10 similar to that illustrated in the figure, extending across the entire width of the web W and fitted one after ':
the other, said boxes 10 comprising intermediate spaceR through which air is sucked as exhaust air or for circulation. The subsequent nozzle boxes 10 are attached, e.g., to a common support plate 30, the blow air being introduced through openings 31 provided in said plate 30 and through related air ducts, in the direction of the arrows A, into the nozzle boxes 10, and the air being distributed out of said boxes through the openings 11 into the spaces 12 and 13 and from these further into the nozzle slots 17 and 1~ which extend across the entire width of the web W.
In the following, the patent claims will be given, whereby the various details of the invention may show variation within the scope of the inventive idea defined in said claims and may differ from the details given above.
Claims (7)
1. A nozzle box having a plurality of nozzles with negative pressure intended for contact-free treatment of mobile material webs, said nozzle box comprising:
a substantially planar carrier face which one of said mobile material webs runs substantially over and parallel to;
a curved Coanda air-guide face at an end of said carrier face;
a first inner wall connected at an end to said curved Coanda air-guide face;
a first outer wall having an end spaced apart from said end of said first inner wall such that a first nozzle is formed, said Coanda air-guide face being configured to turn an air blow coming from said first nozzle toward said carrier face and said one of said mobile material webs;
a second outer wall having a first end which forms a second nozzle with said carrier face, said carrier face comprising an extension outward from said second nozzle such that an air blow from said second nozzle travels substantially parallel to said extension;
means for supporting respective other ends of said outer walls; and said nozzle box having an aperture through which blow air is introduced into said nozzle box.
a substantially planar carrier face which one of said mobile material webs runs substantially over and parallel to;
a curved Coanda air-guide face at an end of said carrier face;
a first inner wall connected at an end to said curved Coanda air-guide face;
a first outer wall having an end spaced apart from said end of said first inner wall such that a first nozzle is formed, said Coanda air-guide face being configured to turn an air blow coming from said first nozzle toward said carrier face and said one of said mobile material webs;
a second outer wall having a first end which forms a second nozzle with said carrier face, said carrier face comprising an extension outward from said second nozzle such that an air blow from said second nozzle travels substantially parallel to said extension;
means for supporting respective other ends of said outer walls; and said nozzle box having an aperture through which blow air is introduced into said nozzle box.
2. The nozzle box of claim 1, wherein said supporting means comprises one or more support plates.
3. The nozzle box of claim 1, wherein said extension is parallel to the plane of the remainder of said carrier face.
4. The nozzle box of claim 1, wherein said extension is slightly inclined from the plane of the remainder of said carrier face in a direction towards said one of said mobile material webs.
5. The nozzle box of claim 1, wherein a blow slot of said second nozzle is defined by said extension and said second outer wall of said nozzle box, said second outer wall being substantially perpendicular to said extension.
6. The nozzle box of claim 1, wherein blow gas emitted from said second nozzle forms an acute angle with the plane of said one of said mobile material webs.
7. The nozzle box of claim 6, wherein said acute angle is approximately 15 degrees.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI890785A FI890785A (en) | 1989-02-17 | 1989-02-17 | SYSTEM AV UNDERTRYCKSMUNSTYCKEN AVSETT FOER BEHANDLING AV ROERLIGA AEMNESBANOR. |
| FI890785 | 1989-02-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2010130A1 true CA2010130A1 (en) | 1990-08-17 |
Family
ID=8527919
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2010130 Abandoned CA2010130A1 (en) | 1989-02-17 | 1990-02-15 | Arrangement of nozzles with "negative pressure intended for treatment of mobile material webs |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPH02242991A (en) |
| CA (1) | CA2010130A1 (en) |
| DE (1) | DE4003956A1 (en) |
| FI (1) | FI890785A (en) |
| SE (1) | SE9000417L (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8061055B2 (en) | 2007-05-07 | 2011-11-22 | Megtec Systems, Inc. | Step air foil web stabilizer |
| CN108699696A (en) * | 2016-01-12 | 2018-10-23 | 株式会社Ｊｃｕ | The wet type processing device of resin film |
| CN113718553A (en) * | 2020-05-26 | 2021-11-30 | 维美德技术有限公司 | Nozzle system for a device for the contactless treatment of a running fiber web |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4033642A1 (en) * | 1990-10-23 | 1992-04-30 | Hoechst Ag | GUIDE DEVICE FOR GUIDING, DEFLECTING AND / OR DEFLECTING A MATERIAL RAIL |
| DE4136806A1 (en) * | 1991-11-08 | 1993-05-13 | Ernst Hohnerlein | Soldering tunnel - has gas flow into the soldering zone enhanced using nozzles with slit-shaped outlet |
| DE19634448C2 (en) * | 1996-08-26 | 1999-06-24 | Voith Sulzer Papiermasch Gmbh | Method and device for applying a liquid or pasty medium to a running material web |
| DE19732138A1 (en) * | 1996-08-26 | 1999-01-28 | Voith Sulzer Papiermasch Gmbh | Process for coating moving web of material with liquid or paste |
| JP7130265B2 (en) * | 2019-10-16 | 2022-09-05 | クリーン・テクノロジー株式会社 | Vertical hot air dryer for film substrates |
-
1989
- 1989-02-17 FI FI890785A patent/FI890785A/en not_active Application Discontinuation
-
1990
- 1990-02-06 SE SE9000417A patent/SE9000417L/en not_active Application Discontinuation
- 1990-02-09 DE DE19904003956 patent/DE4003956A1/en not_active Withdrawn
- 1990-02-15 CA CA 2010130 patent/CA2010130A1/en not_active Abandoned
- 1990-02-17 JP JP3511490A patent/JPH02242991A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8061055B2 (en) | 2007-05-07 | 2011-11-22 | Megtec Systems, Inc. | Step air foil web stabilizer |
| CN108699696A (en) * | 2016-01-12 | 2018-10-23 | 株式会社Ｊｃｕ | The wet type processing device of resin film |
| CN113718553A (en) * | 2020-05-26 | 2021-11-30 | 维美德技术有限公司 | Nozzle system for a device for the contactless treatment of a running fiber web |
Also Published As
| Publication number | Publication date |
|---|---|
| FI890785A (en) | 1990-08-18 |
| SE9000417D0 (en) | 1990-02-06 |
| FI890785A0 (en) | 1989-02-17 |
| JPH02242991A (en) | 1990-09-27 |
| DE4003956A1 (en) | 1990-08-23 |
| SE9000417L (en) | 1990-08-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |