JP3045494U - Veneer dryer - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To efficiently apply hot air to the surface of a veneer plate passing through a drying chamber of a veneer dryer and smoothly flow the hot air, thereby improving the drying efficiency without inducing pressure loss of the hot air. Enhance. SOLUTION: A plywood W moves while being conveyed by conveying rollers 5 in a conveying path of a plurality of stages T1, T2, T3,..., And hot air is blown substantially parallel to the conveying path and against it. 10 is supplied. A plurality of columnar wind directional members 30 are provided between the plurality of stages of the conveyance paths and located between the conveyance rollers 5, and the hot air is divided into two hands along the outer peripheral surface so that the upper and lower plywood plates are separated. It is led to the plate surface of W, merges again, and flows downstream. If the interior of the columnar wind direction body 30 is made hollow and high-temperature steam is supplied to it, a good flow can be created while preventing the temperature of the hot air from lowering.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a veneer dryer for drying a veneer obtained by, for example, removing raw wood by passing through a heating housing (heating section) in which hot air circulates.

[0002]

[Prior art]

 Conventionally, a plywood stripped from a log is stripped into a predetermined size to form a veneer veneer, which is passed through a housing 101 of a veneer dryer 100 by transport rolls 102, 102 as shown in FIG. On the other hand, hot air is blown into the housing 101, and the hot air is applied to the veneer veneer W to dry it. The figure shows one heating section of a three-stage veneer dryer 100. Usually, a plurality of such heating sections are arranged in series, and veneer veneer W is formed by sequentially connecting the plurality of heating sections. It will be gradually dried while passing. The hot air (indicated by HB in the figure) blown into the housing 101 is sent in parallel with, for example, in a direction opposite to, the conveying direction of the veneer veneer W, and a plurality of hot air is blown in order to prevent the temperature of the hot air from lowering. As shown in FIG. 17 (b), an erofin heater 104 is formed between the conveying paths of the steps, and is bent so as to heat the veneer veneer W by the radiant heat and contain moisture evaporated therefrom. Hot air also flows downstream while being heated while contacting the erotic fin heater 104 when flowing downstream.

[0003] In the housing 101, the hot air preferably flows sequentially downstream while being in contact with the plywood W. However, since the gap between the plurality of stages of the transport path is a passage through which the hot air can easily pass, the hot air flows on the plate surface of the plywood W. Is difficult to hit with hot air and the drying efficiency is not always good. In order to prevent this, it is conceivable to provide a baffle plate 105 between a plurality of conveying paths to forcibly guide hot air toward the plywood W. However, in this case, the resistance of the baffle plate 105 is large, and a so-called Karman vortex is also easily generated downstream of the baffle plate 105, so that the pressure loss from the hot air inlet to the downstream increases. In order to obtain a certain level of pressure downstream, the output of the blower that supplies the hot air and the output of the motor must be increased, which increases the size of the equipment and increases energy consumption.

In addition, an erotic fin heater 104 located between a plurality of transport paths is necessary to prevent the temperature of hot air from lowering, and the height H 2 of the housing 101 increases to arrange the heater. If the housing height H is fixed, there is a problem that the number of steps of the transport path formed inside cannot be increased. If the erotic fin heater 104 is omitted, the height dimension H can be reduced, but if it does so, the temperature drop of the hot air becomes large on the downstream side, so that sufficient drying efficiency cannot be obtained.

[0005]

[Problems to be solved by the invention]

 An object of the present invention is to provide a veneer dryer that can reduce the size of a dryer housing (building) and effectively guide hot air to the surface of the veneer plate to increase drying efficiency.

[0006]

[Means for Solving the Problems and Effects of the Invention]

 The veneer dryer of the present invention includes a conveying means for feeding a plywood to be dried along a conveying path in a heating housing, a heater provided in an upper ventilation path and a hot air for drying the plywood to be dried. Means for feeding hot air through the housing, an auto-feeder provided at the entrance of the housing to feed the plywood into the housing, and a means for guiding the hot air to intersect with the transport path and to the plate surface of the fed plywood. The windward side of the hot air has a smooth curved shape that bulges at a predetermined curvature toward the windward side, and the leeward side has an outer peripheral surface that is continuous with the curved shape of the windward side. The hot air is guided to the plate surface of the plywood by the axial wind direction body, and flows further downstream.

The axial wind direction body preferably has a cylindrical outer peripheral surface on both the windward and leeward sides of the hot air, and has a columnar appearance as a whole. In the preferred form, the axial wind direction body is hollow inside. As described above, the hot air is guided along the curved surface to the plate surface of the plywood, and flows further downstream by the axial wind direction member having the appearance such as a columnar shape. Pressure loss is also small. Therefore, the drying efficiency can be increased by effectively guiding the hot air to the surface of the plywood without obstructing the smooth flow of the hot air.

In another mode, a heat source fluid such as high-temperature steam, high-temperature oil, or high-temperature air serving as a heat medium for heating the axial wind direction body flows through the hollow axial wind direction body. The wind direction body itself is a further heat source for hot air, and guides the hot air to the plate surface of the plywood. In this way, the hollow axial airflow body not only functions to guide hot air to the surface of the plywood, but also serves as a kind of heating source to increase or maintain the temperature of the hot air. As a result, these two functions act synergistically to increase the drying efficiency. In addition, since the drying efficiency is increased due to the smooth flow of hot air and the contact with the plywood as described above, it is possible to omit the conventionally used erotic fin heater. When a heat source such as high-temperature steam is circulated through the body, the conventional air fin heater is completely unnecessary because the hot air is actively heated.

The veneer dryer may be transported in a straight-through type in which a veneer veneer cut to a predetermined size is passed in a single pass (usually provided in a plurality of stages), or before cutting a strip-shaped veneer veneer from a log. There is a folding type in which the belt-like plywood is fed along a conveying path that is folded in the dryer housing. Also, from the point of view of the transport means, a roll system in which a plurality of pairs of transport rollers sandwiching the plywood plate in the thickness direction is used to feed the plywood plate, and a plywood plate sandwiched between a kind of belt conveyor such as a net conveyor, and its frictional force It is roughly divided into the belt system to send by. The net is used in the belt method in order to allow hot air to hit the plywood.

In the case of the above-mentioned roller system, for example, it can be configured as follows. The conveying path is provided with a plurality of conveying rollers for conveying the plywood by rotating the plywood plate from both sides in the thickness direction as conveying means for the plywood plate at predetermined intervals in the conveying path. The plurality of transport rollers are arranged at positions corresponding to each other in the plurality of transport paths, and the axial wind direction member is provided between the plurality of transport paths and between the transport rollers of each set. The transport rollers and the axial wind direction members are alternately arranged over a plurality of transport paths. Due to the presence of the axial wind direction body, the thermal efficiency is improved and the erotic fin heater can be eliminated, and the arrangement of the transport roller and the axial wind direction body as described above allows a plurality of stages of transport path intervals (for example, vertical dimensions). Can be reduced to a smaller size, and therefore, the greater the number of stages, the more compact the dimension in the direction of the stage.

In this case, a more specific positional relationship can be defined as follows. The axial wind direction body is positioned at substantially the same distance from a plurality of pairs of transport rollers located around the plurality of transport paths, and is located between a pair of transport rollers corresponding to one transport path and an adjacent transport path. A distance of approximately half of the distance between the axial wind directional member and the neighboring transport rollers, the flow cross-sectional area between the axial wind directional member and one of the adjacent transport rollers and the other transport member. The sum of the cross-sectional area of the flow path between the rollers is set to be substantially equal to the cross-sectional area of the flow path between the corresponding set of transport rollers. In this way, when the hot air is split by the axial wind direction member and then merges, the overall cross-sectional area of the flow path is kept substantially equal, so that a pressure is generated which is a resistance to the flow, and consequently, The effect of increasing the drying efficiency as described above can be obtained while suppressing the pressure loss in hot air circulation.

On the other hand, in the case of the above-described belt-type transport mode, for example, the following configuration can be employed. The transporting means includes a winding transporting means that wraps the plywood in a state sandwiching the plywood in the thickness direction, at least a wrapping member supporting the plywood is a mesh conveyor, and the axial wind direction member is a winding transporting means. It is arranged inside the peripheral circuit in a direction substantially perpendicular to the transport path. Even in the transport mode mainly using such a net conveyor or the like, the hot air that has passed through the net conveyor or the like can be effectively guided to the plate surface of the plywood by the axial wind direction member.

[0013]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to examples shown in the drawings. FIG. 1 shows one heating section 1 of a veneer dryer according to one embodiment of the present invention. In practice, a plurality of such heating sections 1 are connected in series, and veneer veneers (hereinafter, also simply referred to as veneer boards W) cut to a predetermined size are successively connected to each heating section 1 in the longitudinal direction. Dried while being sent to.

The housing 2 of the heating section 1 is composed of a frame 3 and a wall surrounding the frame 3 to form a closed space. A plurality of (four in this example) transport paths are formed in the housing 2 in parallel in the horizontal direction, and a plurality of transport rollers 5 for transporting the plywood W from above and below are provided in each transport path. Provided at substantially equal intervals along the path, the plywood W is conveyed downstream by frictional force by the pair of conveying rollers 5 being driven to rotate in opposite directions. An inlet 8 is provided adjacent to the upstream side of the heating section 1, and a plurality of similar transport rollers 6 are provided here. Then, each veneer plate W is sequentially supplied to the plurality of conveying paths so as to be sorted by the auto feeder 2a, and is introduced into the heating section 1. The auto feeder 2a is a known type in which a support portion for supporting the plywood W can swing up and down so that the plywood W is sequentially distributed to the transport path of each stage, and a position corresponding to the transport path of each stage. The support portions are sequentially positioned at the positions. Downstream of the heating section 1 there is an outlet 9 adjacent to it, and the plywood W leaving the heating section 1 is guided by the individual transport rollers 6 to the next heating section.

A hot air supply device is provided above the housing 2 to supply hot air into the housing 2 substantially in parallel with the transport path. The hot air supply device includes an upper duct 11, and an upstream side duct 12 and a downstream side duct 13 are connected to both ends of the upper duct 11 in the longitudinal direction. These side ducts are connected to both sides of the housing 2 in FIG. It is provided so that it may travel in a direction perpendicular to the direction, and communicates with the housing 2 for heating.

A blower 15 for blowing air is provided at an upstream end of the upper duct 11, and its fan 16 is driven by a motor 18 by a belt 17. The air sent from the blower 15 is heated by passing through the heaters 21 and 22 on the downstream side of the upper duct 11 through the rectifying filter 20, and the high-temperature air passes through the downstream side duct 13 and is heated in the housing 2. It is led to. It should be noted that a configuration is also possible in which air is directly guided from the blower 15 to the heaters 21 and 22 without passing through the rectifying filter 20.

The heaters 21 and 22 have an appropriate heat source. For example, the heaters 21 and 22 are arranged such that high-temperature steam from a high-temperature steam source 23 circulates through the heaters 21 and 22 via a pipeline. Since these steam-type heaters 21 and 22 are publicly known, detailed description is omitted, but heat is obtained by passing drying air through a gap in a pipe through which high-temperature steam flows. The high-temperature air guided into the housing 2 flows to the upstream side while heating and drying the veneer plate W to remove the moisture by flowing and heating the veneer plate W to the upstream side so as to be substantially parallel to the transport direction of the moving veneer plate W. . Then, the air is sucked by the fan 16 of the blower 15 through the upstream side duct 12 and circulated again so as to pass through the heaters 21 and 22.

FIG. 4A shows a ventilation path in the upper duct 11, and FIG. 4B shows a flow of hot air in the heating / drying chamber (lower side). As shown in FIG. 2, the blower 15 includes a pair of left and right fans 16, and a drive pulley 26 is provided on a shaft 25 thereof. These fans 16 suck the hot air that has passed through the drying chamber 10 from the side ducts 12 and 12 in the axial direction thereof and send it out in the diameter direction of the fan 16. The flow of the air is converted by approximately 90 degrees. .

In FIG. 1, in the heating chamber 10, a plurality of columnar wind directional bodies 30 are placed horizontally as axial wind directional bodies, in other words, in parallel with the transport rollers 5 and with respect to the transport path of the plywood W. It is fixed at right angles. The columnar wind directional member 30 is provided vertically above and below each transport path, and a predetermined gap is formed between the upper and lower plate surfaces of the plywood W so as not to interfere with the plywood W passing through each transport path. It has become. In addition, the positional relationship of the columnar wind direction body 30 along the transport path is located between the transport rollers 5 and arranged at the same distance from them.

FIG. 5 is a simplified view of this part. The columnar wind directional members 30 are alternately incorporated with respect to the transport rollers 5 so as to enter between the respective transport paths T1, T2, and T3 and into the space between the respective transport paths 5. Therefore, the hot air impinges on the outer peripheral surface of the cylindrical wind direction body 30 from the gap between the conveying rollers 5 and the flow is split into two hands, one of which hits the plate surface of the upper plywood W, and the other hits the plate of the lower plywood W. Hit the surface. The hot air guided in this way flows along the cylindrical surface of the remaining half circumference of the cylindrical wind directional body 30 and flows again through the gap between the conveying rollers 5 to the downstream cylindrical wind directional body 30 side, where the hot air flows again. The flow is bisected and performs a similar function. In addition, regarding the cylindrical wind direction body 30 located above the uppermost transport path and below the lowermost transport path, the semi-peripheral surface that does not face the plywood is not involved in the correction of the wind direction. Also, it is not necessary that the cross section be cylindrical, and for example, the cross section may be formed in a semicircular shape.

As shown in FIG. 5, the distance G between the outer peripheral surfaces of the upper and lower transport rollers 5 opposed to each other in the plurality of transport paths is set to １ ／ to ／ of the diameter D of the transport rollers 5. ing . This is because the thermal efficiency is increased by the cylindrical wind directional body 30 and the conventional erotic fin heater can be eliminated, so that the vertical distance between the single-stage transport paths can be reduced to about 2/3 of the conventional one. As a result, the building of the veneer dryer can be lowered, or the number of transport stages in the same building can be increased. For example, if the building has a conventional four-stage veneer dryer, this can be increased to six levels.

FIG. 6 shows a preferred example of the positional relationship between the transport roller 5 and the columnar wind direction member 30, particularly the gap relationship. Here, if the gap between the transport rollers 5 arranged in the vertical direction is a, the gap between the columnar wind direction body 30 and the transport roller 5 is set to a / 2. The gap in the vertical direction is the same as the gap in the vertical direction of the transport roller 5. Therefore, for example, when hot air having a flow rate of V + V = 2V passes between vertically adjacent conveying rollers 5 from the right side of the drawing, the hot air is divided into two by the cylindrical wind direction body 30, so that the wind direction body 30 and the conveyance roller 5 Hot air with a flow rate V flows into the gap between them. Further, one of the hot air divided into two from the upper side flows into the space between the vertically adjacent columnar wind direction bodies 30 at the flow rate V, and one of the two flows from the lower side by the adjacent columnar wind direction body 30 forms the flow rate V. , The flow rate here is 2V. Further, the hot air of 2 V flows in the gap between the upper wind direction body 30 and the transport roller 5, and flows between the lower wind direction body 30 and the transport roller 5, and so on. It flows downstream while twisting.

By setting the gap of the flow path of hot air in correspondence with such a calculated flow rate, in other words, a place where the flow rate is large gives a large gap, and a place where the flow rate is small gives a small gap. Make sure that no squeezed portion occurs. As a result, the hot air does not flow in a straight line, but swells by the columnar wind directional body 30, and its circulation distance is lengthened to be effectively guided to the plywood W, and the portion where the pressure increases and the portion where the pressure decreases (throttle If there is, high pressure upstream and low pressure generally downstream) will be eliminated and a smooth flow with little pressure loss will be guaranteed.

It is to be noted that the size of the columnar wind direction body 30 can be appropriately determined according to the actual hot air circulation result in addition to the calculation value. FIG. 7A shows an example in which the columnar wind direction body 30 is made relatively larger than in the case of FIG. 6, and FIG. 7B shows an example in which the size is reduced. Further, it is desirable that the diameter of the columnar wind direction member 30 is set within a range of 1.2 to 3 times, particularly 1.5 to 2.5 times the diameter of the transport roller 5. If the diameter of the columnar wind direction 30 is too small, the effect of changing the flow of hot air cannot be obtained sufficiently, and the effect of guiding the hot air to the plywood will be low, while the diameter of the columnar wind direction body 30 will be too large. In this case, the flow of hot air is obstructed, and the pressure loss increases.

As shown in FIG. 10, the columnar wind direction body 30 may be hollow. For example, it is possible to adopt a metal wind direction body (for example, made of steel) in which both ends of a cylindrical member are closed by end plates. In the case where the wind direction body has a hollow structure, high-temperature steam can be supplied as a heat medium into the inside. For example, hollow cylindrical wind directional members 30 are connected in parallel between an inlet-side steam pipe 35 and an outlet-side steam pipe (see FIG. 11) 36, and high-temperature steam is passed through the steam pipe 35 to each of them. The air is guided to the inside of the wind direction body 30, further discharged outside through a steam pipe 36 on the outlet side, and returned to a steam source as needed.

Each of the wind directional members 30 is fixed to the above-mentioned frame 3 via a bracket 31 fixed to an end face thereof, and as shown in FIGS. 8 and 9, a steam pipe 35 on the inlet side and a steam pipe on the outlet side. The pipe 36 is connected in parallel with the main pipes 33 and 34 and extends in the vertical direction. A sprocket 38 is fixed to one end of the conveying roller 5 shown in FIG. 11 as shown in FIG. 8, and a chain 37 is arranged so as to ride on the sprocket 38 from above. , One of the pair of conveying rollers 5 is rotationally driven. On the opposite side, the transport rollers 5 are connected by a gear 39, and the drive of the chain 37 causes the transport rollers 5 of each set to rotate simultaneously.

FIG. 11 shows a state in which steam is supplied to each hollow cylindrical wind directional member 30, whereby each wind directional member 30 is heated from the inside and becomes a heat source itself. Then, as shown in FIG. 3B, the hot air diverted upon hitting the wind direction body 30 is changed in direction and obtains heat from the wind direction body 30 heated by the steam. Therefore, even if it goes downstream, the temperature of the hot air is prevented or suppressed from lowering, and the effect of changing the flow of the hot air and the effect of giving heat are synergistically exhibited.

In FIG. 12, the mesh belts 40 and 41 are circulated so as to sandwich the plywood W from above and below, and flow downstream with the plywood W sandwiched therebetween. In this example, the case where the transport path has two steps, T1 and T2, is illustrated. The mesh belts 40, 41 are wound around reversing rolls 43, 44 and 45, 46, and the upper track of each mesh belt 40, 41 is suspended by a plurality of rollers 48 arranged in the transport direction from below. Is prevented. Each of the mesh belts 40 and 41 circulates by receiving a driving force due to the frictional force of the roller 48 rotating in contact with these upper tracks. As described above, the air blown out of the blower 15 is circulated so as to be heated by the heaters 21 and 22 and guided to the drying chamber 10 and returned to the blower 15 again. The same columnar wind-direction members 30 as described above are arranged at predetermined intervals so as to be included inside the traveling route of each of the mesh belts 40, 41, and the hot air passing through the mesh belts 40, 41 is passed through the plywood W It plays the role of leading to the board surface.

As shown in FIG. 13, for example, instead of the mesh belt 40, a parallel string-shaped belt 47 is stretched between the rollers 43 and 44, whereby the plywood W is sandwiched between the mesh belt 41 and the plywood W. It can also be sandwiched. As the string-shaped belt 47, for example, a spring-shaped wire wound in a spiral shape can be used.

FIG. 14 shows a net conveyor 50 having a looped return route and a net type conveyor 51 of the same turn type combined with the net conveyor 50 to form a bent transport path leading to the end of the figure. Show. In such a transport path, a plywood stripped from raw wood is temporarily stored as rolls, and then a rewound plywood (not cut) is guided to the transport path along the bent transport path described above. And then flowed downstream. Then, while passing through the drying chamber 10, it is heated and dried by the hot air heated from the blower 15 through the heaters 21 and 22.

The mesh belt 50 is wound around rollers 52, 53, 54, 55, 56, and the mesh belt 51 is wound around rollers 56, 57, 61, 60, 55. Each of the mesh belts 50 and 51 circulates by receiving a driving force due to the frictional force of the roller 48 rotating in contact with the mesh belts, as described above. Note that the plywood W supplied from, for example, is supplied so as to rewind a wound ball obtained by winding a strip-shaped plywood from a log, and can be taken out from the outlet side by a known mechanism. The columnar wind-direction members 30 similar to those described above are provided so as to be located above and below the thus bent transport path, and are arranged at predetermined intervals in the horizontal direction. Also in this case, a flow is generated in which the hot air supplied to the drying chamber 10 is forcibly directed to the plate surface of the veneer plate W by the wind direction member 30.

In the above description, all the axial wind direction bodies have a columnar cross section. However, as illustrated in FIG. 15A, an elliptical cross section or a track shape (a linear cross section parallel to each other) is used. And a streamlined cross section in which the upstream side of the hot air has an arcuate cross section and the downstream side tapers toward the downstream side. In order to obtain a wind direction body having an appearance as shown in FIG. 4B, for example, a tapered wind direction auxiliary body 65 is welded to the downstream side surface of the cylindrical member as shown in FIG. May be integrated.

As shown in FIG. 16, a cylindrical wind direction body 71 having a plurality of small holes 70 provided on the outer peripheral surface of the above-mentioned hollow wind direction body, and hot air is supplied from the inlet 72 into the wind direction body 71 having the small holes. It is also possible to supply the air at a predetermined pressure and to blow out the hot air from the small holes 70 to the outside. In this case, as a hot air supply system, the path of the hot air generated through the heaters 21 and 22 shown in FIG. 1 can be divided and supplied to the respective hollow wind directional members 71 in parallel. Hot air generated by a system (blower, heater, etc.) may be guided to each wind direction body 71. In any case, as shown in FIG. 16B, hot air is guided to the plate surfaces of the plywood W along the outer peripheral surface of the wind direction body 71, and hot air is blown from each wind direction plate 71 to those plate surfaces. Therefore, the plywood W can be more effectively dried.

[Brief description of the drawings]

FIG. 1 is a simplified front view showing one example of a veneer dryer of the present invention in one heating section.

FIG. 2 is a left side view of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a plan view showing a circulation path of hot air.

FIG. 5 is an operation explanatory view showing a main part of FIG.

FIG. 6 is a diagram showing the positional relationship of FIG. 5 in a further enlarged manner.

FIG. 7 is a diagram in which the size of the axial wind direction body is changed from that of FIG. 6;

FIG. 8 is a front view showing an example of a pipe for guiding high-temperature steam into a hollow axial wind direction body.

FIG. 9 is a rear view thereof.

FIG. 10 is an enlarged view of the pipe portion.

FIG. 11 is an operation explanatory view of FIG. 10;

FIG. 12 is a front view schematically showing an example in which the present invention is applied to a direct-through type veneer dryer using a mesh belt.

FIG. 13 is a diagram showing a configuration example in which a plywood plate is moved by being sandwiched between a mesh belt and a string-shaped belt.

FIG. 14 is a front view schematically showing an example in which the present invention is applied to a veneer dryer that moves so as to replace an uncut band-shaped veneer plate.

FIG. 15 is a view showing some cross-sectional examples other than a circular shape of the axial wind direction body.

FIG. 16 is a diagram showing an example in which a number of small holes are provided in a hollow axial wind direction body.

FIG. 17 is a diagram schematically showing a conventional example.

[Description of Signs] 1 Heating Section 2 Housing 5 Conveyance Roller 10 Drying Room 11 Upper Duct 12 Upstream Side Duct 13 Downstream Side Duct 15 Blower (Blower) 16 Fan 21, 22 Heater 23 High Temperature Steam Source 30 Cylindrical Winding Body (Axial wind direction body) 35, 36 Steam pipe 40, 41 Mesh belt

Claims (11)

[Utility model registration claims] In a heating housing, a conveying means for feeding a plywood to be dried along a conveying path, and a hot air for drying the plywood by a heater and an air blowing means provided in an upper ventilation path. A hot air supply means that passes through the inside of the housing, an auto feeder that is provided at an entrance of the housing and feeds the plywood to the inside of the housing, An axial wind direction body provided with a windward side of the hot air having a smooth curved shape bulging at a predetermined curvature toward the windward side, and a leeward side thereof as an outer peripheral surface continuous with the curved shape of the windward side. Wherein the hot air is guided to the plate surface of the veneer plate by the axial wind direction body, and flows further downstream. 2. The veneer dryer according to claim 1, wherein the axial wind direction body has a cylindrical outer peripheral surface on both the leeward side and the leeward side of the hot air, and has a columnar appearance as a whole. 3. The veneer dryer according to claim 1, wherein the axial wind direction body has a hollow interior. 4. A high-temperature steam or high-temperature oil serving as a heat medium for heating the axial wind direction body in the hollow axial wind direction body.
4. A heat source fluid such as high-temperature air is circulated, and the axial wind direction body itself guides the hot air to the plate surface of the veneer plate while serving as a further heating source for the hot air.
Veneer dryer described in 1. 5. The transport path is provided with a plurality of sets of transport rollers for transporting the plywood plate by rotating the plywood plate from both sides in the thickness direction as a transport means of the plywood plate at predetermined intervals in the transport path, Further, the transport path is formed in a plurality of stages, and in the multiple-stage transport path, the plurality of sets of transport rollers are arranged at positions corresponding to each other. 5. The apparatus according to claim 1, wherein the plurality of pairs of transport rollers are provided so that the transport rollers and the axial wind direction members are alternately arranged over the plurality of transport paths. Veneer dryer described in 1. 6. The veneer dryer according to claim 5, wherein the axial wind direction body is located at a substantially midpoint position of a plurality of stages of conveyance paths and / or at a substantially midpoint position of the various conveyance rollers. 7. The multi-stage transport path is provided in a substantially horizontal direction, and between the multiple-stage transport path, the axial wind direction body is provided instead of providing an erotic fin heater, and The veneer dryer according to claim 5, wherein a distance between outer peripheral surfaces of upper and lower transport rollers facing each other in the plurality of transport paths is smaller than at least a diameter of the transport rollers. 8. The distance between the outer peripheral surfaces of the upper and lower transport rollers is 1 / 4D to 3/4, where D is the diameter of the transport rollers.
The veneer dryer according to claim 7, wherein D is set. 9. The axial wind direction body has a columnar shape, and a diameter D ′ of the axial wind direction body is 1.5D or more where D is the diameter of the transport roller.
The veneer dryer according to any one of claims 5 to 8, which is set to 2.5D. 10. The axial wind direction body is located at substantially the same distance from the plurality of sets of transport rollers located around the plurality of transport paths, and has one transport path and a transport path adjacent thereto. The axial wind direction body is close to the surrounding transport rollers at a distance of substantially half the distance between the corresponding set of transport rollers, whereby the axial wind direction body and one of the adjacent transport rollers are adjacent to the axial wind direction body. 6. The flow path cross-sectional area between the rollers and the flow path cross-sectional area between the other transport rollers are substantially equal to the flow path cross-sectional area between the corresponding pair of transport rollers. Veneer dryer. 11. The transporting means includes a wrapping transporting means that circulates the plywood in a state sandwiching the plywood in a thickness direction, wherein at least a wrapping member on a side supporting the plywood is a mesh conveyor, and The veneer dryer according to any one of claims 1 to 4, wherein the wind direction body is disposed inside the peripheral circuit of the winding and conveying means in a direction substantially orthogonal to the conveying path.