JPH0522152B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a strip drying device installed in a printing machine, a coating machine, a paper machine, etc. for film, paper, etc.

[Prior art]

Generally, coating machines are equipped with a number of hot air blowing nozzles that dry the substrate by blowing hot air onto the coated surface of the substrate after applying a coating liquid to a strip-shaped substrate such as film or paper. The paper machine also has one or more drying tubes that dry the wet paper strips, which have been pressed and formed after mesh-making, by directly engaging them with the smooth heat dissipating surface of an internal steam-heated drying tube. Various types of single-tube or multi-tube dryers with tubes and hot air dryers are used in printing presses. In the hot air drying device, a strip material moistened with a coating material is dried while freely running in a floating state in a hot air flow formed by a hot air blowing nozzle. Furthermore, in a single-tube dryer such as the Yankee type, the wet paper strip is dried while directly engaging the smooth heat-radiating surface of the drying tube, and in a multi-tube dryer, the wet paper material is dried while directly engaging the smooth heat-radiating surface of the drying tube. The drying cylinder is directly engaged with the drying cylinder, and is heated while being pressed by a flexible air permeable endless band such as a canvas, and is dried by releasing moisture while freely running between the drying tubes.

[Problem that the invention seeks to solve]

However, in the free running section of the strip running through the strip drying device, due to the turbulence generated as the strip runs, both edges of the strip may experience various effects on the strip while it is running. When force is applied, the product may swell or break, resulting in defective products.In addition, in drying tubes, the strip material directly engaged with the drying tube is pressed and held between the endless strip such as canvas and the smooth heat dissipating surface. Even if it is, the tension of the endless band may differ in the width direction during running, especially the tension at both edges of the endless band may become loose and the band material and the heat dissipation surface may not be in complete contact with each other, causing the band material to rise. This causes problems such as defects such as swelling and wrinkles on both edges of the strip, resulting in loss of width.

Therefore, a method as shown in Japanese Patent Publication No. 60-35477 is adopted, in which the strip is supported by an endless belt made of felt or the like so that the strip does not run freely as described above. Means relating to the special arrangement and guidance of and felts were devised. In addition, as shown in Japanese Patent Publication No. 40-23869, at least one pair of edge belts are provided around the rim of a lightweight wheel so that no free running section of the strip is formed in a hot air dryer. The edge belt is supported on the rim of the lightweight wheel to hold the edge of the strip in contact with the edge of the lightweight wheel and to direct drying air toward the strip. A method was devised to dry the wood.
Furthermore, as shown in Japanese Patent Application Laid-open No. 181396/1983, the multi-tube drying device has a drying system that covers most of the drying tube and free running section of the strip, and is suitable for drying strips containing air. The strip is continuously processed over a large portion of the free running section and over the transfer rolls, and the edges of the strip are shaped into a contour pattern or disposed edge strip at the edge of the drying wire. A method of fixing and holding the strip in a predetermined position at the edge of the strip by continuing to press, a box body disposed on both sides of the strip and the edge thereof, and the box body is attached to the edge of the strip. A device has been proposed that has a channel in an inclined direction and an inlet for air.

However, in the invention disclosed in Japanese Patent Publication No. 60-35477, it is not possible to securely hold the strip material over the free running section of the strip material. In other words, even if a perforated suction roll for guiding the felt is provided in the free running section and the strip material can be suctioned and held on the perforated surface of the roll through the felt, there is a partial gap between the drying tube and the roll. Since there is a non-suction felt holding section, the strip material and the felt do not come into close contact with each other, and the strip material lifts up from the felt due to the influence of turbulence, causing the strip material to swell or break. . In addition, devices such as those shown in Japanese Patent Publication No. 40-23869 and Japanese Patent Application Laid-open No. 60-181396 are designed to prevent a pair of edge belts or edge strips from forming any free running section of the strip. Alternatively, the edge of the strip may be clamped and fixed between an edge belt or edge strip and the rim of a lightweight wheel or the outer circumferential surface of a drying tube, or the edge of the strip may be clamped in an edge groove of a drying wire. Since the material is fixed and held by being pressed into the groove by a compressed air jet from a nozzle, or by press-fitting the edge of the band material into the groove by a strip, it is possible to hold the material in a fixed manner by pressing it into the groove by a compressed air jet from a nozzle. Such holding means with a fixed lateral spacing cannot be used to dry strips with a large amount of drying shrinkage or strips of various width dimensions.

However, in the device as shown in Japanese Patent Publication No. 40-23869, the distance between the pair of lightweight wheels is adjustable, so changes in the amount of shrinkage of the strip material during drying in the width direction or the cutting width However, since the edge of the strip is closely clamped between the edge belt and the rim of a lightweight wheel provided with corrugated portions and grooves, the portion of the strip to be gripped is As a result, strip materials with low wet strength such as wet paper will break immediately, and only strip materials such as films or woven strips with high wet strength can be used.

The device disclosed in Japanese Patent Application Laid-Open No. 181396/1983 includes a box body disposed on both sides of the strip material and its edge, and this box body is inclined with respect to the edge of the strip material. A unique holding means is presented with a directional channel and an inlet for air. However, such means involve non-contact clamping of the edges of the strip between a pair of edge strips by the frictional force of a powerful blast of compressed air, even if the compressed air touches the outer surface of the edge strips. Even if it is oriented, a large amount of compressed air will be ejected on both sides of the strip, creating severe turbulence, so thin and lightweight strips such as paper will flap violently due to the turbulence.
Additionally, it has been found that there is a problem in that the edges of the paper material exposed to the turbulent air flow become overly dry, resulting in a decrease in strength and causing swelling and breakage.

[Technical issues]

Therefore, the present invention provides printing machines for film, paper, etc.
A strip material drying device provided in a coating machine, a paper machine, etc., which is equipped with one or more of a drying tube and a drying air nozzle, wherein either one of the drying tube and the free running section of the strip material is provided. In order to prevent the wet strip material from flapping locally or becoming undried, and to prevent it from flapping or becoming over-dry due to turbulence caused by blowing out compressed air, etc. Even if it is a band material such as a wet paper material that retains the parts and generates strong internal stress due to shrinkage during drying,
In order to prevent the band material from cracking or breaking due to the strong stress, the holding force of the band material against the stress can be adjusted at any time or anywhere, and it is possible to adjust the holding force of the band material to resist the stress, and to prevent the band material from shrinking in the width direction when drying or various types of material. There is a technical problem in realizing a hot-air dryer, single-tube or multi-tube dryer that can dry a wide strip material while holding both edges (5 m/m or more). .

[Means for solving problems]

In order to solve the above problems, according to the present invention,
A strip drying device equipped with one or more of a drying tube and a drying air nozzle that dry a long and wide wet strip while running it, and which dry the strip at both edges and the outer circumferential surface of the strip. a pair of annular ventilation rims that partially engage with each other; the radially outer side is opened through a hole passing through the ventilation rims, and the radially inner side and the circumferential direction and the axial direction are respectively defined by walls; a ring-shaped portion having a ventilation chamber formed inside each of the pair of ventilation rims is provided at one or more of both edge portions of the drying barrel and the free running section of the strip; , a pressure regulator capable of adjusting the chamber pressure in the ventilation chamber in order to adsorb and hold both edges of the strip material engaging the porous outer peripheral surface of the ventilation rim on the outer peripheral surface under a desired surface pressure that is less than atmospheric pressure; A strip drying apparatus is provided having means.

〔Example〕

A first embodiment of a strip drying apparatus according to the present invention will be described with reference to FIG. 1, which is a schematic side view including a partial sectional view.

The first embodiment is a multi-tube paper material dryer equipped with a drying cylinder 1 horizontally supported in a vertical zigzag manner and drying air nozzles 2 for drying while running a long and wide paper strip p. The apparatus includes a shaft tube 70 whose shaft end is supported by an adjustment plate 78 that is supported by a frame 780 so that its position can be adjusted in the horizontal direction (indicated by arrow a in FIG. 1), and which is supported externally on the main shaft 7. bearing 72
A ventilation rim 31 is supported via spokes 314 on a boss 312 which is rotatably attached to a boss 312 via a vent rim 31 that partially engages both edges e of the paper material p, and a porous hole 31a passing through it. A partition wall 31 that is open radially outwardly and integrally formed with the ventilation rim 31.
partitioned axially inwardly and radially inwardly by 0;
In addition, the plate-shaped partition portion 311a is supported via spokes 318 by a boss 316 whose side end portions are in sliding contact with the inner surfaces of the ventilation rim 31 and the partition wall 310, and which is externally inserted and fixedly supported on the shaft tube 70, and is supported via spokes 318. A small chamber 302, a large chamber 304, and a small chamber 3 are formed in the circumferential direction along the inner surface of the portion of the ventilation rim 31 that is partitioned axially outwardly and circumferentially by a protruding annular partition wall 311 and engages with the paper material p.
A ventilation chamber 32 in which 00 is formed in a row, and each chamber 30
2 and 304 are connected to a vacuum pump (not shown) through ventilation pipes 42 and 44 connected to a pressure regulating valve 46, respectively, and the small chamber 300 is connected to a pressure pump (not shown) through a ventilation pipe 40 connected to a pressure regulating valve 46. ), and the chamber pressure can be adjusted individually by the pressure regulating valve 46, and the paper material p that engages with the outer peripheral porous surface of the ventilation rim 31 is removed from each chamber 302, 304 whose pressure is below atmospheric pressure. After adsorbing and holding the strip material on the porous surface under a desired surface pressure, the strip material holding ring 3, which is equipped with a pressure regulating means 4 that releases the holding under a desired surface pressure from the small chamber 300 above atmospheric pressure, is moved diagonally upward and downward. A pair of rollers are provided vertically close to each other in the free running section of the strip material between the opposing drying tubes 1, and also close to both edge portions E of the drying tube 1, respectively.

The band material holding ring 3 is supported by a shaft tube 70 which is movable in the axial direction via a gear transmission mechanism 50 by an electric motor 5 attached to an adjustment plate 78 on the operation side, and a stator 60 is attached to the shaft tube 70 and a boss 312 is rotated by the shaft tube 70. The driving wheel 30 is rotated at a predetermined rotational speed by an electric motor 6 which is supplied with power from a power source (not shown) equipped with a frequency control device through an electric wire 64 that passes through the shaft tube 70 to which the child 62 is attached, and its boss 312. A connecting pipe 74 is fixed at one end and has a protrusion 740 protruding from the other end, and is externally supported on the main shaft 7 so as to be movable in the axial direction. It is directly connected to the driving wheels 30 through a connecting pipe 76 which has an elongated guide hole 760, has its other end fixed to the drive-side boss 312, and has its one end externally supported by the connecting pipe 74 so as to be freely movable in the axial direction. Follower wheel 33
It consists of

The drying air nozzle 2 is arranged close to the paper material P such that its ventilation porous surface 22 covers the entire outer surface of the paper material P in the width direction between both edges e of the paper material P that engages with the strip retaining ring 3. , inside there is a partition wall 20 in the width direction and circumferential direction.
A large number of ventilation chambers 20 partitioned by 0 are formed, and a large number of ventilation holes 22a which are elongated in the width direction and communicate with the ventilation chambers 20 are opened in the ventilation hole surface 22. Each ventilation chamber 20 is connected to a ventilation pipe 24, 26 connected to a pressure regulating valve 28, respectively. ), and the ventilation pipe 26 is connected to a suction fan (not shown) via a dust remover and the primary side of the heat exchanger (both not shown). The ventilation holes 22a of each pressurized ventilation chamber 20 are oriented so as to face the outer surface of the paper material p in its running direction (indicated by arrow b in FIG. 1).

Note that the drying tube 1 and the canvas 8 for pressing the paper material p that engages with the heat dissipating outer circumferential surface of the drying tube 1 are often used in multi-tube drying apparatuses having a well-known configuration, and will not be described here.

Next, a second embodiment of the strip drying apparatus according to the present invention will be described with reference to schematic side views including a partial view and a partial sectional view.

The second embodiment is a multi-tube paper material drying device equipped with drying cylinders 1 horizontally arranged in an upper and lower zigzag pattern for drying a long and wide strip of paper material p while running it. a ventilation rim 11 that is formed integrally with both edge portions E of the cylinder wall 10 having a smooth heat radiation surface of the drying tube 1 that partially engages with the paper material p, and partially engages with both edge portions e of the paper material p; It is opened radially outwardly through a porous hole 11a penetrating it, and is partitioned axially inwardly and radially inwardly by a partition wall 110 formed integrally with the ventilation rim 11, and is axially inwardly opened. A large number of small chambers 3 are partitioned outward in the axial direction and in the circumferential direction by annular partition walls 111 that protrude at equal intervals in the circumferential direction of the plate-shaped partition wall portion 111a.
A ventilation chamber 32 formed with a series of 00's and a rotary joint 66 connected to a vacuum pump (not shown).
is attached to the operating side protruding portion, passes through the operating side shaft neck 12 of the drying cylinder 1, passes through the inside of the drying cylinder 1, and extends to the driving side shaft neck 12.A ventilation branch pipe 400 branches from the ventilation pipe 40. Each shaft neck 12 is penetrated radially outward and connected to each small chamber 300 via a three-way switching valve 402, and each three-way switching valve 402 is connected to a power source (not shown). An electric wire 64 is connected to the inside and outside of the drying cylinder 1 via a rotary switch 68 attached to the side end of the ventilation pipe 40 protruding toward the operation side, and is connected to the paper material that engages with the ventilation rim 11. P is adsorbed and held on the porous surface of the ventilation rim 11 under a desired surface pressure from the small chamber 300 which is less than atmospheric pressure, and then released from the holding under a desired surface pressure from the small chamber 300 which is open to atmospheric pressure. A band-shaped retaining ring 3 is provided at both edges of the drying cylinder 1, respectively.

The rotary switch 68 connects each small chamber 3 of the ventilation chamber 32 to a circular insulating plate 680 attached to the operating side protrusion of the ventilation pipe 40 that rotates together with the drying cylinder 1.
Contacts 680b are fixed at respective positions on one side 680a of the insulating plate 680 radially opposite to the insulating plate 680, and the positions are fixed only at the contacts 680b located at approximately half of the insulating plate 680. Each small chamber 3 has a semicircular brush 682 disposed so as to be in constant sliding contact with each other and communicates with the paper material p via the ventilation rim 11 portion with which the paper material p is engaged.
Only each three-way switching valve 402 connected to 00 is connected to drying cylinder 1.
As the switch rotates, the power is switched to the "open" operating state, and all vacuum pumps (not shown) are activated in each of the small chambers.
and communicates with each other three-way switching valve 40.
2 are sequentially energized to the "closed" state, and the small chambers 300 are connected to each other through the three-way switching valves.
The brush 682 is arranged so that only the inside is exposed to the atmosphere. Although not shown, the brush 682 may have its position and arc length arbitrarily selected or adjustable, and any brush made of mercury liquid or the like can be used.

Next, a third embodiment of the strip drying apparatus according to the present invention will be described with reference to FIG. 3, which is a schematic side view including a partial sectional view.

The third embodiment is a strip-shaped paper material dryer equipped with a large number of drying air nozzles 2 so as to sandwich the paper material p in an upper and lower zigzag pattern, in which a long and wide strip-shaped wet coated paper material p is dried while running. The device includes a frame 780
The main shaft 7, which is supported at its shaft end via a shaft tube 70, is externally supported so as to be movable in the axial direction by an adjusting plate 78 which is supported so as to be vertically adjustable in position (indicated by arrow C in FIG. 3). The boss 312 is rotatably attached to the shaft tube 70 on the operation side and the tubular valve body 404 formed on the outer periphery of the short shaft tube that is externally supported and fixed to the main shaft 7 through bearings 72, respectively. , each spoke 3
A ventilation rim 31 that is supported through the paper material p and partially engages both edges e of the paper material p, and is opened radially outwardly through a porous hole 31a that passes through it, and is integrated with the ventilation rim 31. The axially inner side and the radially inner side are partitioned by the formed partition wall 310, and the annular partition wall 311 protrudes axially inwardly from the plate-shaped partition wall portion 311a at equal intervals in the circumferential direction. A ventilation chamber 3 in which a large number of small chambers 300 are connected in a row in the circumferential direction and are partitioned outwardly and in the circumferential direction.
2, valve holes 406a are formed in the boss 312, the shaft pipe 70, and the short shaft pipe at equal intervals, passing through the boss 312 and corresponding to each of the small chambers 300, extending along the inner circumferential direction of the boss 312. Annular valve seat 40
6, and the small chamber 30 corresponding to its valve hole 406a.
0 are connected to each other in a radial manner, and a small valve chamber 40 extending in the circumferential direction is provided on the outer periphery of the valve body 404 that makes sliding contact with the valve seat 406.
5. The large valve chamber 409 and the small valve chamber 407 are partitioned off from each other and are formed in a series in close proximity to each other, and as the boss 312 rotates, each valve hole 406a opens in each valve chamber 405, 409, 407 in sequence. Rotary switching valves 403 are formed respectively, and ventilation pipes 40 and 44 are connected to a vacuum pump (not shown) through a pressure regulating valve 46 in valve chambers 405 and 409 through the main shaft 7, respectively. In addition, a pressure regulating valve 46 is provided in the valve chamber 407.
Vent pipes 42 are connected to pressure pumps (not shown) through the vent pipes 42, and each chamber pressure can be adjusted individually by each pressure regulating valve 46. Pressure regulating means for adsorbing and holding the paper material p on the porous surface under a desired surface pressure from the small chamber 300 that is less than atmospheric pressure, and then releasing the holding under a desired surface pressure from the small chamber 300 that is higher than atmospheric pressure. 4
A strip holding ring 3 having a strip retaining ring 3 is provided at a free running section position of the paper material p facing the drying air nozzle 2 with the paper material p in between.

The band material holding ring 3 is connected to the adjusting plate 7 via a bearing 702.
8 and rotatably externally supported on the main shaft 7, one end is connected to the boss 312, and the gear is driven by the electric motor 6, which is powered by a power source (not shown) equipped with a frequency control device and is attached to the adjustment plate 78. A driving wheel 30 rotated at a predetermined number of rotations via a transmission mechanism 61, one end of which is connected to a boss 312, and a protrusion 740 protruding from the other end, which is externally supported on the main shaft 7 so as to be movable in the axial direction. One end side is externally supported on the tube 74 so as to be movable in the axial direction, and the protrusion 7
40 is inserted into the guide hole 760 so as to be freely movable in the axial direction. It consists of a follower wheel 33 whose position in the axial direction can be adjusted by an electric motor 5 via a gear transmission mechanism 50. Drive side ventilation pipes 40, 42,
44 is connected to each valve chamber 405, 407, 409 through the main shaft 7, through the main shaft 7 and the short shaft pipe, and to the operating side ventilation pipes 40, 42, 44, a telescopic pipe is connected respectively. Each vent pipe passes through the main shaft 7, an axially elongated hole 70a bored in the main shaft 7, and the shaft pipe 70, and each valve chamber 40 passes through the shaft pipe 70.
5, 407, and 409, respectively.

The drying air nozzle 2 is arranged close to the paper material p so that its ventilation porous surface 22 covers the paper material p between both edges e of the paper material p that engages with the strip retaining ring 3, A large number of ventilation chambers 20 are formed by partitioning in the circumferential direction by partition walls 200, and a large number of ventilation holes 22a that are elongated in the width direction and communicate with the ventilation chambers 20 are opened in the ventilation porous surface 22, respectively. . Each ventilation chamber 20 is connected to a ventilation pipe 24, 26 connected to a pressure regulating valve 28, respectively, and the ventilation pipe 24 is connected to the secondary side of an air heater and a heat exchanger (both not shown).
The ventilation pipe 26 is connected to a push-in fan (not shown) through a dust remover and the primary side of the heat exchanger (both not shown), and to a suction fan.
The ventilation hole 22a of each pressurized ventilation chamber 20 is made of paper material p.
(arrow b in Fig. 3)
Indicated by ) is oriented in the direction of opposing.

[Effect]

Regarding the operation of the technical means of the present invention, the first,
This will be explained based on 2nd and 3rd embodiments.

The first embodiment operates as follows.

The wet paper material P, which has been rolled and formed into a wide thin strip after passing through the wire mesh section and the water squeezing section (both not shown) of the paper machine, is heated by internal steam heating which constitutes the multi-tubular drying section of the paper machine. The drying tubes 1 are engaged with the heat dissipating outer circumferential surface of the drying tube 1 and are pressed and supported on the outer circumferential surface by the canvas 8 to be sequentially heated, and are caused to travel in an upward and downward zigzag manner by the rotation of each drying tube 1 horizontally arranged in an upward and downward zigzag manner. It is heated and dried by repeating heat radiation and moisture radiation in the free running section of the paper material p between the drying tubes 1 which face each other in vertical and diagonal directions. In this free running section of the paper material, a pair of horizontally supported strip holding rings 3 are ventilated, which are adjusted and positioned in advance so as to be close to both edge portions E of the opposing drying cylinders 1 and close to each other. The rim 31 partially engages and supports both edges e of the paper material p, so that the paper material p
run in an S-shape. The outer peripheral porous surface of the ventilation rim 31 that engages with the paper material p is controlled by the pressure regulating means 4 at the introduction side surface of the paper material p by adjusting the vacuum of a vacuum pump (not shown) with the pressure regulating valve 46 to -1000 m/min. The surface pressure from the small chamber 302 whose room pressure has been adjusted to a reduced pressure of less than m water column is applied to the outlet side of the paper material p by adjusting the pressure of a pressure pump (not shown) with a pressure regulating valve 46 to +500 m/m water column. The vacuum pump (not shown) is applied to the surface pressure from the small chamber 300 whose chamber pressure is adjusted to the following pressurization degree, and the surface area between the introduction side and the outlet side.
The vacuum of -1000m/m is adjusted by the pressure regulating valve 46.
Large room 304 with room pressure adjusted to a degree of decompression exceeding the water column
There is more surface pressure.

The horizontal position of the strip material holding wheel 3 is determined by adjusting the horizontality of the strip material holding wheel 3 and the drying tube 1 and the strip material holding wheel by an adjustment plate 78 bolted and supported by the frame 780 on the operating side and the drive side. Closeness to ring 3,
The degree of proximity between the strip holding wheels 3 is adjusted in advance, and the axial position of the strip holding wheels 3 is adjusted according to the width w of the paper material p by adjusting the driving wheels 30 and the electric motor 5 in forward and reverse directions for gear transmission. The axial tube 70 is moved axially via the mechanism 50 and placed in advance. The circumferential surface pressure of the ventilation porous surface 22 of the drying air nozzle 2 is:
A suction fan (not shown) sucks out the introduced side part of the paper material p.
The suction strength of the fan (not shown) is adjusted to the suction pressure to the outlet side ventilation chamber 20, which has been adjusted to the desired degree of pressure reduction by adjusting the suction strength with the pressure regulating valve 28. The ejection pressure from the ventilation chamber 20 is adjusted by the pressure regulating valve 28 to a desired degree of pressurization. The pressure in each ventilation chamber 20 is adjusted so that the pressure is adjusted accordingly. At this time, it is preferable to set the surface pressure of the portion of the ventilation porous surface 22 exceeding the width w of the paper material p to 0 by blocking the ventilation of each ventilation chamber 20.

In this way, the paper material p is engaged with the heat dissipating outer circumferential surface of the drying cylinder 1 and is made to travel at a high speed exceeding 1500 m/mm, and is also pressed from the outside against the heat dissipating outer circumferential surface by the canvas 8 and is restrained and supported. heated.
Next, under reduced pressure from the porous surface portion on the paper material p introduction side of the strip material holding ring 3 that is close to the drying tube 1, both edges e of the paper material p are exposed to the ventilation rim 31 of the adjacent strip material holding ring 3.
(usually has porous holes 31a uniformly bored in the circumferential direction over a width of 5 m/m or more), and is caused to travel in a circular orbit. At this time, the paper material p tries to swell outward in the radial direction along the circular orbit, but the paper material p tries to swell outward in the radial direction along the circular orbit, but the paper material p is moved in the running direction of the paper material p across the width direction from the ventilation hole surface 22 of the drying air nozzle 2 (see FIG. , indicated by arrow b), the formation of the bulge can be suppressed by the pressing force of the heated jet oriented to face the bulge, and both edges e of the bulge are restrained and supported, causing flapping and bulging, which prevents running. It runs smoothly at high speeds without causing instability. Next, both edges e of the paper material p are exposed to pressure from the side surface portion of the strip holding ring 3 from which the paper material p is drawn out, and the paper material p is released from its adsorption and holding, and the next strip material in the vicinity thereof is released. The paper material p is exposed to reduced pressure from the side surface of the holding ring 3 where the paper material p is introduced, and is transferred to the adjacent band material holding ring 3 where it is adsorbed and held, allowing it to smoothly change direction without causing unstable running such as flapping. , travels in an S-shape. During this time, the paper material p is exposed to suction pressure from the paper material p introduction side ventilation chamber 20 of the drying air nozzle 2 across its width, and the high temperature moisture released from the paper material p is absorbed by the running of the paper material p. Direction (arrow b in Figure 1)
Indicated by ), the paper material p is sucked into the introduction-side ventilation chamber 20 by the heated jet flow countercurrent to the paper material p, is removed by a dust remover (not shown), and then passed through a heat exchanger (not shown). Push-in fan (not shown)
The heat is recovered to the lower temperature supply air side, and the supply air is further heated to a desired temperature by an air heater (not shown) and sent to each ventilation chamber 20 of the drying air nozzle 2.

In this way, the paper material p that has traveled in the S-shaped free running section between the opposing drying tubes 1 has its both edges e pressed against the pressure surface of the porous surface portion of the strip holding ring 3 on the paper material p outlet side. It is exposed to pressure and is released from its adsorption and holding, and is also pressed and transferred to the heat radiating outer circumferential surface of the next adjacent drying cylinder 1, and is further pressed from the outside by the canvas 8, and tightly adheres to the heat radiating outer circumferential surface and is restrained. The supported and heated paper material p is restrained and held over its entire travel path and is rapidly dried by repeating heating and moisture release.
At this time, the band holding ring 3 is driven by a frequency-controlled power source (not shown) to drive the drying cylinder 1 (not shown).
It is driven by an electric motor 6 whose rotation speed is controlled at a predetermined rotation speed that is synchronized with the rotation speed.

The second embodiment operates as follows.

The wet paper material P, which has been rolled and formed into a wide thin strip after passing through the wire mesh section and the water squeezing section (both not shown) of the paper machine, is heated by internal steam heating which constitutes the multi-tubular drying section of the paper machine. The drying tubes are partially engaged with the heat dissipating outer circumferential surface of the drying tube 1, and are pressed and supported by the heat dissipating outer circumferential surface of the drying tube 1, and are caused to travel with the rotation of each drying tube 1 horizontally supported in a vertical zigzag manner. After being heated by 1, the paper material p is repeatedly dried in the free running section between the drying cylinders 1, where moisture is released.

The strip retaining ring 3, which is integrally formed with both edge portions E of each drying tube 1, has a ventilation rim 11 through which a porous hole 11a passes, a ventilation chamber 32 consisting of a large number of small chambers, and a small chamber 300 that rotates as it rotates. It also includes pressure regulating means 4 that sequentially regulates the chamber pressure. This pressure regulating means 4 uses a rotary switch 68 to energize and "close" the three-way switching valves 402 connected to the rotary switch 68 in accordance with the rotation of the drying cylinder 1.
The rotary joint 66, the ventilation pipe 40, and the ventilation branch pipe 400 are sequentially operated from the power-off state to the "open" state.
A vacuum pump (not shown) is sequentially communicated with a vacuum pump (not shown) via a three-way switching valve 402 and a small chamber 300 that communicates with the edge e of the paper material p via the portion of the ventilation rim 11 that the paper material p engages with. will be operated.

On the heat dissipating outer peripheral surface of a conventional drying cylinder, the paper material that engages with it is pressed by the canvas and is restrained and supported by the outer peripheral surface, but the tension of the canvas tends to fluctuate at both edges of the paper material. The pressing force fluctuates and the material does not come into close contact with the outer circumferential surface, resulting in uneven drying in some areas and the formation of swells and wrinkles.

However, in the second embodiment, both edges e of the paper material p are exposed to the reduced surface pressure from each small chamber 300 through the perforations 11a of the ventilation rim 11, and are adsorbed and supported by the heat dissipation porous surface of the drying cylinder 1. Since the paper material p is pressed and supported by the canvas 8 across the width direction, it is securely restrained and supported in close contact with the heat dissipating outer circumferential surface of the drying cylinder 1 throughout the width direction, and the paper material p is uniformly and thermally efficiently By heating, as described above, defects such as swelling and wrinkles, especially on both edges e of the paper material p, are eliminated.

The ventilation rim 11, which usually has a width of 5 m/m or more, has perforations 11a uniformly and densely perforated in the circumferential direction, and each small chamber 300 is normally controlled by a pressure regulating valve (not shown) connected to the ventilation pipe 40. The room pressure can be adjusted to a desired degree of decompression of 500 m/m water column or more, and the pressure regulating means 4 is connected to the insulating plate 680 of the rotary switch 68.
The brush 682, which is in sliding contact with each contact 680b fixed on one side 680a of the brush 682, may be constructed so that its position and arc length are variable, and both edges e of the paper material p are connected to the ventilation rim 11. The position where suction starts and the position where suction support from the ventilation rim 11 is released are determined.
The position of the inside of the small chamber 300 may be adjusted so as to be able to increase or decrease the pressure depending on the traveling speed, physical properties, and other conditions of the paper material p.

In this way, the paper material p is engaged with and heated by the heat-radiating outer peripheral surface of the drying cylinder 1, and then separated from the heat-radiating outer peripheral surface and freely runs to the next drying cylinder 1, but at the time of this separation,
Or just before that, the three-way switching valve 402 is sequentially switched to the energized "closed" state at high speed by the rotary switch 68, and the small chamber 300 is opened to the atmosphere via the three-way switching valve 402, so that the paper material p is pressed against the canvas 8. Immediately after being further released, both edges e of the paper material p are smoothly released from the suction and holding state under the atmospheric surface pressure from the small chamber 300 that is open to the atmosphere, and the paper material p causes running instability such as flapping. It moves freely to the next drying tube 1 without any trouble.

Next, the third embodiment operates as follows.

The wet coated paper material P in the form of a wide thin strip is coated with the coating liquid by the coating device of the coating machine (not shown). It runs freely in a wave shape in a hot air drying device equipped with a nozzle 2 and is dried with hot air from the drying air nozzle 2.

Prior to passing the paper material p, the axial position of the trailing wheel 33 of the band material holding wheel 3, which is disposed at a position close to and facing the drying air nozzle 2 so as to sandwich the free running paper material p, is adjusted to the paper material p. The electric motor 5 is rotated in forward and reverse directions and moved via the gear transmission mechanism 50 and the shaft tube 70 to adjust the vertical position of the strip retaining ring 3 to match the width w of the frame 78 on the operation side and drive side.
Adjustment plate 78 bolted and supported at 0 adjusts the horizontality of the strip holding ring 3, the closeness of the strip holding wheels 3 that face each other in the vertical and diagonal directions, and the drying air nozzle 2.
The positions of the belt material holding ring 3 and the belt material holding ring 3 facing the belt material holding ring 3 are adjusted in advance. Next, each strip holding ring 3 is connected to a frequency controlled power source (not shown).
As a result, the electric motor 6 is driven at a desired rotation speed and rotated via the gear transmission mechanism 61 and the like. Also, the ventilation rim 31 of the band material holding ring 3 with which the paper material p engages
The adjustment means 4 adjusts the surface pressure of the outer peripheral porous surface portion as follows.

That is, the porous surface portion on the introduction side of the paper material p is opened into the valve chamber 405 of the rotary switching valve 403 and the valve hole 406 that opens into the valve chamber 405 as the band retaining ring 3 rotates.
a and a ventilation branch pipe 400, and is connected to a vacuum pump (not shown) by a pressure regulating valve 46.
The chamber pressure from each small chamber 300, which is regulated to a desired degree of decompression of 500 m/m water column or less, is adjusted to the desired decompression surface pressure through the pores 31a, and the paper material p
The lead-out side part is the valve chamber 40 of the rotary switching valve 403.
7 and a pressure pump (not shown) through a valve hole 406a that opens into a valve chamber 407 as the band holding ring 3 rotates and a ventilation branch pipe 400. The chamber pressure from each small chamber 300 adjusted to the desired pressurization degree is adjusted to the desired pressurization surface pressure through the porous holes 31a, and the other surface portions are connected to the valve chamber 409 of the rotary switching valve 403 and the band material. As the retaining ring 3 rotates, the valve chamber 409
Valve hole 406a and ventilation branch pipe 40 opened to
The chamber pressure from each small chamber 300, which is connected to the vacuum pump (not shown) through the pores 31a and regulated by the pressure regulating valve 46 to a degree of pressure reduction exceeding -500 m/m water column, is used to reduce the desired pressure through the porous holes 31a. Adjust and place it so that the surface pressure is the same.

The drying air nozzle 2 adjusts the room pressure so that the surface pressure of the paper material p introduction side of the ventilation porous surface 22 reaches a desired degree of pressure reduction by adjusting the suction pressure of the suction fan (not shown) using the pressure regulating valve 28. In addition to the adjusted intake pressure from the introduction side ventilation chamber 20, the other ventilation porous surface 2
The surface pressure of the two parts is adjusted to the exhaust pressure from the other ventilation chamber 20 by adjusting the air supply source pressure of the push-in fan (not shown) using the pressure regulating valve 28 to reach the desired pressurization degree. Furthermore, the pressure in each ventilation chamber 20 is regulated by adjusting the pressure in each width direction portion of the ventilation porous surface 22 so that the surface pressure of each widthwise portion of the ventilation porous surface 22 becomes a desired pressure reduction degree distribution and pressurization degree distribution, respectively. At this time, the surface pressure of the portion of the ventilation porous surface 22 that exceeds the full width w of the paper material p is preferably set to zero by blocking each ventilation chamber 20 corresponding to that portion.

Next, the paper material p is sequentially engaged with each strip material holding ring 3 and passed through, and both edges e of the paper material p are connected to the paper material p introduction side portion of the ventilation rim 31 of the strip material holding ring 3. It is exposed to a weak vacuum surface pressure, is softly adsorbed to the introduction side part and transferred and supported, and is then exposed to a strong vacuum surface pressure and is reliably adsorbed and held on the porous surface of the ventilation rim 31 without flapping, forming an arc. The paper will be automatically fed. At this time, the paper material p tries to swell outward in the radial direction, but from the ventilation hole 22a of the drying air nozzle 2 to the width direction of the paper material p (indicated by arrow b in FIG. 3). The pressure of the heated jet flow directed to face the paper material P is suppressed from causing the aforementioned swelling of the paper material P, and the paper material P is stably fed without causing unstable running such as flapping.

Of course, the high temperature moisture released from the paper material p is sucked into the introduction side ventilation chamber 20 through the paper material p introduction side ventilation hole 22a of the drying air nozzle 2, and is transferred to the air supply side via a heat exchanger (not shown). heat is recovered.

Next, both edges e of the paper material p are transferred under pressure from the porous surface portion of the ventilation rim 31 from which the paper material p is led out, and the paper material p is transferred to the next drying air nozzle 2 across its width. The paper material P is exposed to the suction pressure from the ventilation chamber 20 on the introduction side, and is smoothly changed direction without causing any unstable running such as flapping, and is pushed out to the side of the next strip holding ring 3, and its ventilation rim. It is adsorbed and transferred to the outer peripheral porous surface of 31 and held.

In this way, the paper material p is adsorbed and supported by the strip material holding wheel 3 without any cuts on both edges e over its entire free running section, and runs smoothly at high speed, and is also heated and dehumidified by being exposed to hot air. is repeatedly dried.

In addition, used in the strip drying device according to the present invention,
The strip holding ring may have a ventilating rim with a smooth porous outer peripheral surface, but in order to more strongly attract and hold the strip, the porous surface may have a large number of minute protrusions or a large number of It may be formed with grooves, and the material of the porous surface is preferably metal, heat-resistant and wear-resistant synthetic rubber or synthetic resin, ceramics, or the like. In addition, as pressure regulating means, for example, the lateral physical properties of the strip material are detected on-machine using a strip material residual internal stress measurement means as shown in Japanese Patent Application Laid-Open No. 59-26850, and a vacuum pump or pressurizer is used. A pressurization or depressurization source such as a pump, or a pressure regulating valve may be automatically or manually adjusted using a pressure regulating device of known construction based on the detected signal value.

〔effect〕

The present invention has the following effects.

That is, according to the present invention, in the drying tube and/or the free running section of the strip, the wide wet strip is adsorbed at both edges by the strip holding ring and runs while being constrained and supported, and is repeatedly heated and dehumidified to dry it. Therefore, even if turbulence occurs around the running strip due to the running of the strip, rotation of the drying tube, hot air from the drying air nozzle, ventilation, etc., running instability such as flapping may occur. The strip material can be run at high speed without any problems, and strong ventilation and hot air blowing are possible, so drying can be quickly stopped. During drying, only the narrow edges of the strip are adsorbed and held by the ventilation rim of the strip holding ring, and in the case of the drying tube, due to the heat dissipation of the ventilation rim, and in the free running section of the strip, Since both edges are constantly heated and dried repeatedly by hot air from the drying air nozzle, the strip material may break, swell, wrinkle, etc. due to over-drying or under-drying of both edges. Nor.

In addition, since both edges of the strip are adsorbed and supported by the strip holding ring by the reduced surface pressure of the perforated surface of the ventilation rim, it is possible to prevent the paper material from causing strong shrinkage internal stress during drying, or from being damaged or damaged. Even if the band material is easily damaged, such as lightweight paper, the suction holding force, that is, the surface pressure value of the outer periphery of the ventilation rim, can be adjusted in various ways by the pressure adjustment means, and the suction that counters the internal stress can be adjusted in various ways. By variously adjusting the holding force at various times or places, it is possible to prevent the strip from breaking or being damaged due to the internal stress. Further, by varying the internal stress value applied to the strip at any time or place, a product having desired widthwise uniform physical properties can be manufactured. In addition, even for strips of various width dimensions, it is possible to adjust the widthwise position of the strip holding ring, so only the narrow edges of the strip are restrained and supported. It is possible to
Even if quality defects occur at both edges of the strip due to the constraint support, the product yield can be extremely high.

As described in detail above, the strip drying device according to the present invention can eliminate all the drawbacks of conventional drying devices, and can also be applied to existing single-tube, multi-tube, or hot-air drying devices with slight modifications. Not only can it be applied alone, but also products of extremely high quality can be manufactured, so the benefits of using it in this field of business are extremely large.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of a first embodiment of a strip drying device according to the present invention, FIG. 2 is a schematic side view of a second embodiment of a strip drying device according to the present invention, and FIG. 3 is a schematic side view of a second embodiment of a strip drying device according to the present invention. It is a schematic side view of 3rd Example of the strip material drying apparatus based on FIG. Explanation of symbols, 1...Drying tube, 11...Vent rim, 11a...Porous hole, 110...Partition wall, 111...
...Annular partition wall, 2...Drying air nozzle, 3...Strip material holding ring, 31...Ventilation rim, 31a...Porous hole,
310... partition wall, 311... annular partition wall, 32...
Ventilation chamber, 300, 302...Small chamber, 304...Large chamber, 4...Pressure adjustment means, E...Both edges of drying cylinder, p
...Band material, e...Both edges.

Claims (1)

[Claims] 1. A strip drying device equipped with at least one of a drying cylinder and a drying air nozzle that dry a long and wide wet strip while running it, which a pair of annular ventilation rims that are partially engaged with each other; and a pair of annular ventilation rims that are open on the outside in the radial direction through holes that pass through the ventilation rims, and that are defined on the inside in the radial direction, the circumferential direction, and the axial direction by walls, respectively. , a ring-shaped portion including a ventilation chamber formed inside each of the pair of ventilation rims is provided at one or more of both edge portions of the drying tube and the free running section of the strip; Further, the chamber pressure in the ventilation chamber is adjustable so that both edges of the band material engaging with the perforated outer peripheral surface of the ventilation rim are adsorbed and held on the outer peripheral surface under a desired surface pressure that is less than atmospheric pressure. A strip drying device having pressure means.