JPS5920615B2 - Air nozzle assembly for glass fiber spinning - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air nozzle assembly for spinning glass fibers, and more particularly to an air nozzle assembly for blowing an air stream onto an orifice plate surface of a glass fiber spinning furnace.

Conventionally, a method of spinning glass fibers by blowing an air stream onto the orifice plate surface of a glass fiber spinning furnace is known.
A typical example thereof is disclosed in Japanese Patent Publication No. 51-46859.

The disclosed method involves molten glass flowing through an orifice forming a cone of molten glass on the orifice plate surface, and a large number of orifices piercing each other so closely that the cones merge into each other. When spinning glass fibers from an orifice plate, which is simply a flat plate with holes, stable cones are formed, and the cones are cooled and placed in close proximity to the orifice plate. The orifice is positioned substantially parallel to and toward the orifice plate to eliminate any stagnant gas present and to replenish the gas wicked downwardly by the fibers being spun. It directs the airflow reaching the plate. This method can also be applied to the production of glass fibers using so-called tip nozzle plates. An example of an air nozzle device for blowing an air stream onto the orifice plate surface in the above type of glass fiber spinning method is US Pat.
No. 86853 discloses a device in which air introduced at equal pressure from a plurality of introduction pipes is guided into an air nozzle body and blown out from one continuous opening.

However, since the air nozzle device of this US patent has a large diameter blowout opening, the pressure of the airflow hitting the orifice plate surface is weak, and the cooling effect is determined by the pressure hitting the orifice plate rather than the amount of air, so the cooling effect is ultimately strong. On the other hand, increasing the amount of air in order to increase the cooling effect had disadvantages such as increasing the frequency of cutting the filament.

Therefore, in view of this point, the special public service was developed in 1974-33.
An air nozzle device disclosed in Publication No. 293,
This is a system in which a plurality of independent tubular nozzles are fixed to a fixture in a line with intervals, and instead of one large blowout opening, multiple independent tubular nozzles are arranged in parallel at intervals. By using a tubular nozzle, we succeeded in increasing the pressure of the air flow hitting the orifice plate surface and increasing the cooling effect.

Also, similar to the one disclosed in Japanese Patent Publication No. 54-33293, an air nozzle device having a configuration in which a plurality of independent tubular nozzles are arranged side by side is disclosed in Japanese Patent Publication No. 54-10.
In this air nozzle device, each tubular nozzle is connected to a manifold through a communication passage, and each communication passage is provided with a valve for independently and individually controlling the flow rate of each tubular nozzle. A mechanism is built in.

In this air nozzle device as well, the air flow is discharged from multiple independent tubular nozzles.
US Pat. No. 3,986,853 similar to that of -33,293
It was able to provide a superior cooling effect compared to the No. However, in all of the above air nozzle devices, since a tubular nozzle (pipe) was used as the nozzle element, in order to securely arrange the tubular nozzle on a fixture or support block, a corresponding hole must be drilled in the fixture or support block. Therefore, a boundary wall of a predetermined thickness must be left between the holes to provide the strength necessary for fixing and supporting the tubular nozzle, and the tubular nozzle itself must also have a wall thickness. For some reasons, the distance between the nozzle passages of adjacent tubular nozzles cannot be less than a certain distance, and therefore the density of the air flow blown out from each tubular nozzle is increased to improve the cooling effect. The structure was not suitable for increasing the height.

Also, manufacturing and assembly required a lot of work. In addition, the special public service 54-332
No. 93 discloses that the cross-sectional shape of the tubular nozzles is oval or elliptical, and the tubular nozzles are arranged side by side so that the short axis of the oval or ellipse is parallel to the longitudinal direction of the orifice plate.
The idea of providing a wider uniform cooling effect in the width direction of an orifice plate that coincides with the long axis direction of an oval or elliptical shape is disclosed, and the same idea can be applied to the one disclosed in JP-A-54-101925. can.

In this case, when viewed in the longitudinal direction of the orifice plate, the number of tubular nozzles can be increased to the extent that the cross-sectional shape of the tubular nozzles becomes oval or elliptical, and the density of the number of air flows can be increased. However, a tubular nozzle (tube) is still used, and the problem still exists that the density of the number of air flows cannot be increased due to the above-mentioned structural limitations caused by the tubular nozzle.

In addition, to make a tubular nozzle with an oval or elliptical cross section, as described in Japanese Patent Publication No. 54-33293, a circular tube is usually pressed with a press to make it flat, or it is heated on a mold with a burner. It is necessary to make the nozzle into an elliptical tube, which requires a lot of effort to manufacture, and even if it can be manufactured, there are restrictions on the selection of the cross-sectional shape, and the structure is not suitable for obtaining an arbitrary nozzle cross-sectional shape.

Furthermore, when a circular tube is transformed into a tubular nozzle with an oval or elliptical cross section, a hole of the same shape must also be made in the fixing device or support block that fixes it, and any hole with a shape other than circular must be made. Opening the air nozzle is a fairly difficult task, and as a result makes manufacturing and assembly of the air nozzle device difficult. The present invention has been made in view of the above-mentioned drawbacks of the prior art, and its object is to provide an air nozzle assembly for blowing an air flow onto an orifice plate surface of a glass fiber spinning furnace, in which the number of air flows discharged from each nozzle is An object of the present invention is to provide an air nozzle assembly in which the density of the nozzle can be easily increased, the cross-sectional shape of the nozzle can be freely selected, and the manufacturing and assembly are easy.

In order to achieve the above object, the present invention provides an air nozzle assembly for blowing an air flow onto an orifice plate surface of a glass fiber spinning furnace, the air inlet having a manifold having an air supply port. and an air nozzle section having a plurality of nozzle passages communicating with the manifold, the air nozzle section having a plurality of nozzle ribs of the same shape continuously arranged between a pair of parallel guide plates. The nozzle block has a nozzle block in which these guide plates and nozzle ribs are arranged side by side and combined by fitting, and each of the nozzle ribs has a recess extending in the longitudinal direction formed in at least one of the opposing side surfaces facing the direction of juxtaposition. An air nozzle assembly is provided, wherein the nozzle passage is formed between adjacent nozzle ribs.

In a preferred embodiment of the air nozzle assembly, the recess is formed in both of the opposing sides of the nozzle rib, such that the cross-sectional shape of the nozzle passage formed between adjacent nozzle ribs is adjusted in the direction of the juxtaposition. It is elongated in the direction perpendicular to.

Further, the fitting for combining the guide plate and the nozzle rib is achieved by forming a plurality of vertical recesses in parallel on the inner surface of the guide plate, each having a shape that complements the opposing end edge of the nozzle rib. This is achieved by engagement between the nozzle rib and the end edge of the nozzle rib. The air nozzle section may further include a holding device for firmly holding the nozzle block, and the holding device includes a pair of clamping plates located on opposite sides of the nozzle block, and a holding device for firmly holding the nozzle block. a pair of holding plates located at opposing edges of the clamping plate and connected to the clamping plate in a box shape so as to surround the nozzle block; It consists of a threaded plate that engages and presses the outer surface of the guide plate.

Preferred embodiments of the present invention will be described with reference to the drawings.
The figure shows the use of the air nozzle assembly of the present invention in a spinning device shown in side section.

Reference numeral 2 in the figure indicates a glass fiber spinning furnace, and the molten glass that has been melted in advance in the spinning furnace 2 and adjusted to a constant temperature is
It passes through an inflow passage 6 made in the refractory 4 and flows into the platinum alloy spun bushing 8 below. The bushing 8 has a box-like shape consisting of an orifice plate 10 having a large number of orifices on the lower surface and a plate rising from the orifice plate 10 and forming a side wall 12, and although not shown in the figure,
1 for flowing controlled low voltage and large current to bushing 8
A pair of terminals is provided on the exterior of the sidewall plate 12, usually on the widthwise side of the bushing. By passing current from the terminal mainly to the orifice plate 12 and to some extent to the side wall plate 12, these plates made of platinum alloy generate heat, increasing the temperature of the entire bushing, and in particular the temperature of the orifice plate 10,
Prevent the temperature of molten glass from dropping and control the temperature to be suitable for spinning. This control is normally performed by a loop that uses a thermoelectromotive force from a thermocouple welded to the side wall plate 12 of the bushing as an input signal to control the current flow so as to maintain the temperature of the bushing constant. Also, in the illustrated embodiment, the orifice plate 10 has a large number of closely spaced orifices on its flat underside.

Although it is of the type disclosed in Japanese Patent Publication No. 51-46859, it may also be a so-called chip nozzle plate in which a large number of chip nozzles are formed protruding from the lower surface of the plate. The molten glass flowing out from the orifice of the orifice plate 10 is pulled by the winder 14 and is thinned into a filament while forming a cone at the orifice outlet.A sizing agent is applied to this filament by the application roller of the applicator 16. The strands are collected into one or more strands by a converging roll 18, and wound around a drum of a winder 14 while being twisted by a traverse device 20 to form a package 22.

Reference numeral 24 designates an air nozzle assembly of the present invention for blowing an air stream onto the lower surface of the orifice plate 10, thereby cooling the surface of the orifice plate, and when the molten glass flows out from the orifice and is atomized to form a filament, the orifice is Forms a stable molten glass cone at the outlet,
It cools the cones and eliminates stagnant gas present in the vicinity of the orifice plate 10 and replenishes the gas sucked downward by the spun fibers.

Air nozzle assembly 24 is connected to an air supply conduit or hose 26 and is supplied with air from a pressurized air source, not shown. The details of the structure of the air nozzle assembly 24 are shown in FIGS. 2 to 5, and are roughly divided into an air introduction section 32 equipped with a manifold 30 having an air supply port 28, and a plurality of nozzle sections communicating with the manifold 30. Nozzle passage 34 described later
It has an air nozzle section 36 with an air nozzle section 36.

The air nozzle section 36 includes a pair of parallel guide plates 35.
, 37, a plurality of nozzle ribs 38 of the same shape are successively arranged side by side, and these guide plates 35, 37 and nozzle ribs 38 are combined by fitting.
9, and each nozzle block 39 has a longitudinally extending recess 44, 4 in opposite sides 40, 42 facing in the juxtaposed direction.
6 are formed, and one nozzle passage 34 is formed between adjacent nozzle ribs 38 in these recesses 44 and 46. Since only the partition wall 48 serving as the bottom of the recesses 44 and 46 exists between adjacent nozzle passages 34, the distance between the nozzle passages 34 is extremely small, increasing the number of air streams blown out from the nozzle passages 34. Can be densified. The pair of guide plates 35, 37 and each nozzle rib 38 are fitted together by forming a vertical recess on the inner surface of each guide plate 35, 37 with a shape that complements the opposing end edges 47, 49 of the nozzle rib 38. place 50, 52
By forming a plurality of parallel ribs, the end edges 47, 49 of these nozzle ribs 38 and the vertical recesses 50, 52 of the guide plates 35, 37 are preferably fitted slightly tightly.

However, this fit is limited to the pair of guide plates 35.
, 37 may be provided with a dovetail-shaped inclined recess instead of a vertical recess, and the opposing end edges 47, 49 of the nozzle rib 38 may also be provided with a corresponding dovetail-shaped recess. In this case, the guide plates 35, 37 and the nozzle rib 3
8 can be more actively prevented. Further, protrusions are provided on the inner surfaces of the guide plates 35 and 37,
A recess having a shape corresponding to the end edges 47 and 49 of the nozzle rib 38 may be provided. The recesses 44 and 46 formed in each nozzle rib 38 cooperate with the inner surfaces of the guide plates 35 and 37 so that the cross-sectional shape of the nozzle passage formed between the adjacent nozzle ribs is perpendicular to the juxtaposed direction of the nozzle ribs 38. Although the shape is an octagon elongated in the direction, the nozzle passage is not limited to this shape, and the cross-sectional shape of the nozzle passage may be, for example, a rectangle or other elongated polygon. When the nozzle ribs are placed in contact with each other, the cross-sectional shape of the nozzle passage may be oval, elliptical, or circular.

The nozzle rib 38 and the guide plates 35, 37 can be made of metal such as ordinary iron, and in this case, the recesses 44, 46 of the nozzle rib 38 described above can be easily made by grinding or extrusion. .

Therefore, the recesses 44 and 46 can have any shape,
The cross-sectional shape of the nozzle passage can be freely selected.
Note that the nozzle rib 38 and the guide plates 35, 37 may be made of materials other than iron, such as stainless steel or aluminum alloy. Even in these cases, the recess 44 of the nozzle rib 38,
46 can have any shape, and the cross-sectional shape of the nozzle can be freely selected. The cross-sectional shape of the nozzle passage is preferably elongated in the direction perpendicular to the direction in which the nozzle ribs 38 are arranged in parallel, as in the illustrated embodiment. By doing so, the density of the nozzle passage can be increased with the same cross-sectional area, and the density of the number of air flows can be further increased. Further, as explained on page 4 of Japanese Patent Publication No. 54-33293, by arranging the air nozzle part 36 so that the short axis of the cross-sectional shape of the nozzle passage is parallel to the longitudinal direction of the orifice plate 10, the nozzle It is possible to provide a wider uniform cooling effect in the width direction of the orifice plate, which corresponds to the long axis direction of the passage, and it is possible to increase the range of widthwise arrangement of orifices on the orifice plate. In the illustrated embodiment, the recesses 44 and 46 are formed on both side surfaces 40 and 42 of the nozzle rib 38, but a nozzle passage can be similarly obtained by forming a recess on only one of the side surfaces 40 and 42.

In addition, since the nozzle ribs located at both ends need only form the nozzle passage 34 on one side of both side surfaces 40, 42, the side surface that does not form the combined nozzle passage is flattened without a recess, as shown in FIG. The end ribs 54 (one of which is not shown) may have a shape similar to that shown in FIG. The air nozzle section 36 of the illustrated embodiment also has nozzle ribs 38 juxtaposed to the guide plate 3.
It has a device for firmly holding the nozzle block 39 formed by combining the nozzle blocks 5 and 37.

This holding device includes a pair of iron clamping plates 58 and 60 located on both sides of the nozzle block 39 facing the guide plates 35 and 37, and a pair of iron pressing plates 62 located at both ends of the nozzle block 39. , 64, and a pressing plate 58
, 60 and the holding plates 62, 64 are connected by bolts 66 in a box shape so as to surround the nozzle block 39. Each clamping plate 58, 60 has five screw holes 68 in two stages.
, 69 are bored, and set screws 70, 71 are fitted into these screw holes 68, 69, respectively. Therefore, by turning these set screws 70, 71 and pressing the surfaces of the guide plates 35, 37 of the nozzle block 39 with their tips, the nozzle block 39 is clamped and held firmly. Also, the guide plates 35, 37
As shown in FIG. 3, a stepped portion 65 parallel to the upper end surface is formed in the portion surrounded by the clamping plates 58, 60, and a step portion 65 of a shape corresponding to the inner surface of the clamping plates 58, 60 is also formed. A portion 67 is formed, and these step portions 65 and 67 actively prevent the clamping plates 58 and 60 from falling.

The set screw 70 is applied to the upper side of the stepped portions 65, 67, and the set screw 71 is applied to the lower side of the stepped portions 65, 67, respectively. It should be noted that instead of the above-mentioned retaining device, the rib blocks 38 at appropriate locations are preferably replaced with a material without recesses, and guide plates 35 are provided at opposite edges of this material.
, 37 may be directly fixed and held with bolts.

The air nozzle section 36 of the illustrated embodiment is also provided with a metal support lock 72, such as common iron, for supporting the juxtaposed and combined nozzle blocks 39.

The support block 72 has a recess 74 for receiving the lower end of the nozzle block 39, which recess 74 is open not only upwardly, but also outwardly at both ends, so that the grinding process is not possible. The recess 74 can be easily formed by, for example. The width of the recess 74 is larger than the thickness of the nozzle block 39, and a spacer 76 is inserted into the extra dimension as shown in FIG. This spacer 76 has a set screw 8 screwed into four screw holes 78 drilled in the support block 72 at right angles thereto.
The tip of the nozzle block 39 is pressed toward the nozzle block 39 and firmly holds the lower end of the nozzle block 39. A pair of positioning plates 82 and 84 are fixed to both ends of the recess 74 with bolts. The support block 72 also has communication passages 86 formed at positions aligned with each of the nozzle passages 34 of the nozzle block 39. The support block 72 is connected with a bolt to a guide block 88 for position adjustment, which will be described later. In addition to the manifold 30, the air introduction section 32 includes
A valve mechanism 9 for independently and individually finely adjusting the amount of air guided from the manifold 30 to the nozzle passage 34.
0, and a guide block 88 for adjusting the positional relationship between the valve mechanism 90 and the air nozzle portion 36 to the optimum state for use.

The manifold 30 is made of iron plate material or the like connected together in a box shape with bolts, and a nipple 94 for connecting the hose 26 is connected with a bolt at a position corresponding to the air supply port 28.

In the illustrated embodiment, the number of air supply ports 28 and nipples 94 is four, and in this case, the interior of the manifold 30 is also divided into four corresponding chambers by three partition plates 96. Further, valve devices (not shown) for adjusting air flow rate are installed between the hoses 26 connected to each nipple 94 and the air supply source, and each valve device can be controlled independently. The flow rate of the air flow blown out from the nozzle passage 34 of the nozzle block 39 can be divided into four corresponding groups and controlled individually. Note that reference numeral 98 is a screen for removing foreign matter from the air flow. Valve blocks 92 are preferably made of ordinary iron and are secured to the upper end of manifold 30 by bolts and each open into manifold 30 and communicate with passageway 8 of support block 72.
It has a communication path 100 that communicates with 6.

Each communication passage 100 incorporates a valve mechanism 90 for finely adjusting the flow rate of airflow therethrough. The valve mechanisms 90 are arranged in two stages in a staggered manner, as shown in FIG. By doing this, the communication path 1
00, and even the nozzle passages in the nozzle block 39, and the valve mechanism 90.
makes operation easier. Each valve mechanism 90 is a needle-shaped valve, and a valve hole 102 having a diameter approximately the same as or slightly larger than the diameter of the communication passage 100 is bored in a direction substantially perpendicularly crossing the corresponding communication passage 100.
The end portion on the inlet side is threaded, and a needle valve portion 104 having approximately the same diameter as the valve hole 102 and a valve hole 102 are threaded.
A bolt-shaped needle valve 108 having a threaded portion 106 corresponding to the thread of the valve hole 102 is inserted into the valve hole 102.

The head 110 of the bolt-shaped needle valve 108 is desirably made as small as possible in view of the close arrangement, and is of a hexagonal socket type that can be operated with a bolt wrench.
A coil spring 112 is disposed between the head 5110 of the bolt-shaped needle valve 108 and the valve block 92, and a coil spring 112 is disposed between the valve hole 102 and the bolt-shaped needle valve 108.
It absorbs some play between the two and allows for slight movements. Therefore, by inserting a bolt wrench into the head 110 and turning the bolt-shaped needle valve 108, the needle valve part 104 can be moved in and out of the valve hole 102 to change the opening degree of the communication passage 100 and finely adjust the flow rate. I can do it. The nozzle passage 34 of the nozzle block 39 is connected to the aforementioned hose 26 by a valve device (not shown).
A wide range of flow rate control is possible by dividing the air flow blown from the nozzle into four sections and by individually finely adjusting the air flow blown from the nozzle passage 34 by the valve mechanism 90. Guide block 88, preferably made of ordinary iron, is bolted and supported on valve block 92 and bolts and supports support block 72. The guide block 88 has a communication passage 100 of the valve block 92 and a communication passage 86 of the support block 72 communicating with each other with the former staggered in the opposite direction from the head 110 of the bolt-like needle valve 108 with respect to the latter. An inclined communication path 114 is formed for this purpose. By doing so, the head 110 of the bolt-like needle valve 108 and the valve block 92, as well as the manifold 30
As shown in FIG. 3, the nozzle block 39 and the support block 72 can be placed in a retracted state from the front side (left side as seen in FIG. 3), and can be placed in the state of use shown in FIG. The air nozzle assembly 24 is connected to the needle valve 1 at
08 can be placed under the orifice plate 10 and as perpendicular to it as possible without coming into contact with the glass filament being spun. usually,
The air nozzle assembly has a head 110 of the needle valve 108 behind the two groups of filaments with its longitudinal direction aligned with the longitudinal direction of the orifice plate, as shown in FIG.
is installed facing the filament side, and its valve operation is performed from the working passage side facing the air nozzle assembly across the filament group, using, for example, an elongated bolt wrench. In this case, if there is a protrusion, such as a needle valve head 110, on the lower front of the nozzle block 39, the entire air valve assembly must be tilted to prevent it from contacting the filament. However, in this case, the air flow blown out from the nozzle block 39 obliquely collides with the orifice plate, and the portion of the orifice plate on the rear side where the air flow collides is not sufficiently flown, resulting in non-uniform cooling. Therefore, it is preferable that the air valve assembly 24 is installed as vertically as possible, and the air valve assembly 24 is preferably installed as vertically as possible.
This has achieved its purpose. In the illustrated embodiment, a guide block 88 and a valve block 92 are interposed between the nozzle block 39 and the manifold 30, but if one focuses only on the above-mentioned advantages of the nozzle block 39, the guide block 88 and valve block 92 can be omitted. In this case, the nozzle block 39 can be connected to the manifold 30.
It can be directly fixed and supported on the top of the.

Therefore, according to the air nozzle assembly of the present invention, the air nozzle portion is assembled by sequentially arranging a plurality of nozzle ribs of the same shape between a pair of parallel guide plates and fitting the guide plates and nozzle ribs together. A recess extending in the longitudinal direction is formed in at least one of the opposing side surfaces facing the juxtaposed direction of each nozzle rib, and a nozzle passage is formed between adjacent nozzle ribs in this recess. Since there is only a partition between the nozzle passages, which serves as the bottom of the recess, it is possible to narrow the interval between the nozzle passages and arrange them closely, thereby increasing the density of the number of air streams blown out from each nozzle passage. I can do it.

For example, if we compare this with the conventional configuration disclosed in Japanese Patent Publication No. 54-33293, in which a plurality of tubular nozzles (tubes) each of which is independent of one row are arranged side by side, in the case of this conventional tubular nozzle, is 1 (177!) The number of air flows per length was approximately 0.7 to 1.0, but according to the illustrated embodiment of the present invention, it is possible to have up to 1 (approximately 3 air flows per length). , we were able to achieve about 3 to 4 times higher density. Therefore, by increasing the density of the air flow, the cooling effect of the orifice plate can be enhanced and uniform, and it is possible to Better elimination of existing stagnant gases, formation of stable molten glass cones in a large number of closely drilled orifices of the orifice plate and better separation thereof, stable glass fiber formation with less thread breakage. The recess of each nozzle rib can be made into any shape by grinding, extrusion, or molding, so the cross-sectional shape of the nozzle passage can be freely selected. If the cross-sectional shape of the nozzle passage is elongated in the direction perpendicular to the juxtaposition direction, the airflow can be blown over a wide range in the width direction of the orifice plate, and uniform cooling can be achieved in the width direction as well. In addition, the nozzle ribs are easy to process, and the connection to the manifold only requires forming one rectangular recess to support the rib block alone, so the air nozzle assembly can be easily processed. Manufacturing and assembling three-dimensional objects becomes extremely easy.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the use of the air nozzle assembly of the present invention in a spinning apparatus shown as a side sectional view;
3 is a partially sectional front view of a preferred embodiment of the air nozzle assembly of the present invention; FIG. 3 is a longitudinal sectional view of the air nozzle assembly of FIG. 2; Figure 4 is a partially enlarged view of the tip of the nozzle block in the air nozzle assembly shown in Figure 2. and FIG. 5 is a sectional view showing the end presser plate and clamping plate of the nozzle block holding device in the air nozzle assembly of FIG. 2. In the figure, code 2...Glass fiber spinning furnace, 10...
... Orifice plate, 24 ... Air nozzle assembly, 28 ... Air supply port, 30 ...
... Manifold, 34... Nozzle passage, 35,
37... Guide plate, 36... Air nozzle section, 38... Nozzle rib, 39...
... Nozzle block, 40, 42 ... Side,
44, 46... Concavity.

Claims (1)

[Scope of Claims] 1. An air nozzle assembly for blowing an air flow onto an orifice plate surface of a glass fiber spinning furnace, the air nozzle assembly having an air inlet having a manifold having an air supply port, and communicating with the manifold. and an air nozzle section provided with a plurality of nozzle passages, the air nozzle section having a plurality of nozzle ribs of the same shape successively arranged between a pair of parallel guide plates, and a plurality of nozzle ribs having the same shape arranged side by side between the guide plates and the nozzle ribs. each nozzle rib has a longitudinally extending recess formed in at least one of the opposing side surfaces facing in the juxtaposition direction, and the recess between the adjacent nozzle ribs is formed in the recess. An air nozzle assembly characterized in that the nozzle passage is formed in the air nozzle assembly. 2. The air nozzle assembly according to claim 1, wherein the recesses are formed on both of the opposing side surfaces of the nozzle ribs, thereby improving the cross-sectional shape of the nozzle passage formed between adjacent nozzle ribs. an air nozzle assembly that is elongated in a direction perpendicular to the direction of juxtaposition. 3. In the air nozzle assembly according to claim 1, a fitting for joining the guide plate and the nozzle rib is provided on the inner surface of the guide plate to complement the opposing end edge of the nozzle rib. An air nozzle assembly in which a plurality of parallel vertical recesses each having a shape of 1, 2 and 3 are formed in parallel, and the recesses are engaged with an end edge of the nozzle rib. 4. The air nozzle assembly according to claim 1, wherein the air nozzle section further includes a holding device for firmly holding the nozzle block, and the holding device is arranged on opposite sides of the nozzle block. a pair of clamping plates located at the opposite end edges of the nozzle block and connected to the clamping plates in a box shape so as to surround the nozzle block; An air nozzle assembly comprising a threaded plate which is screwed into a threaded hole formed in a clamping plate and whose tip engages and presses the outer surface of the guide plate of the nozzle block.