TW202303060A - Heat drying device for sheet-like products - Google Patents

Abstract

In a heat drying device for sheet-like products, a plurality of return guide sections (10) are provided in a heating chamber (2) inside a casing (1) at a top position and bottom position inside the heating chamber (2), and pass continuous sheet-like products introduced into the heating chamber (2) through the plurality of return guide sections (10) in a winding state. A plurality of flat heating elements (20) are disposed facing each other in close proximity on both sides of the linear portion of the sheet-like products that move between the top and bottom return guide sections (10), and a winding path (6) is formed inside the heating chamber (2) using the flat heating elements (20) as walls.

Description

Sheet heating and drying device

The present invention relates to a heating and drying device that continuously sends out sheets in a heating chamber while heating or drying them, especially relates to a sheet-shaped sheet that can heat and dry sheets with high efficiency and can miniaturize the device. Object heating and drying device.

For example, in the following Patent Document 1, etc., there is known a heating and drying device for a sheet, which is to dry the surface of a continuous sheet after printing or coating, or to perform For annealing of the formed sheet, etc., the sheet is moved in the heating chamber while heating and drying.

The heating and drying device of Patent Document 1 is equipped with heating parts such as electric heaters on the top and bottom of a cubic or cuboid heating chamber, and staggers and arranges 4 pairs of upper movable rollers and lower movable rollers alternately near the center of the heating chamber. Between the upper movable roller and the lower movable roller, the sheet introduced into the heating chamber is passed while snaking up and down, and the sheet is heated and dried.

Also, in this heating and drying device, when increasing the dryness of the sheet, the position of the upper movable roller is raised, and the lower movable roller is lowered, so that the meandering distance of the sheet is increased. Thereby, the residence time of the sheets in the heating chamber becomes longer and the dryness is improved. On the other hand, when reducing the dryness of the sheet, the position of the upper movable roller is lowered, and the lower movable roller is raised to shorten the snaking distance of the sheet, thereby reducing the residence time of the sheet in the heating chamber. shortened and the dryness decreased. [Prior Art Literature] [Patent Document] [Patent Document 1] Japanese Patent No. 5535755

[Problem to be solved by the invention]

However, the heating part (electric heater) of the above-mentioned heating and drying device is only arranged on the top and bottom of the heating chamber. Basically, through the heating operation of the upper and lower heating parts, the temperature of the entire heating chamber is controlled to be suitable for the sheet. Heat drying temperature. The heating dryness corresponding to the type of sheet is adjusted through the length of the sheet that snakes up and down, that is, the time that the sheet stays in the heating chamber.

Therefore, when the four pairs of upper movable rollers and lower movable rollers move up and down, the heating parts arranged on the top and bottom of the heating chamber maintain the temperature of the wide heating chamber space at a temperature suitable for heating and drying sheets. Even when heating and drying sheets with low dryness, the power consumption of the electric heater in the heating part does not change much.

Also, if the upper and lower lengths of the snaking sheet become longer, the distance from the heating part to the sheet will inevitably become longer, making it difficult for the radiant heat from the heater to reach the sheet, reducing the heating efficiency of the heating part. The drying time becomes longer and the power consumption increases. Furthermore, this heating and drying device must be equipped with a moving mechanism to move the upper movable roller and the lower movable roller up and down, so there are problems of increasing the size of the device and increasing the manufacturing cost, and it is desired to achieve miniaturization and energy saving of the device.

The present invention was made to solve the above-mentioned problems, and an object of the present invention is to provide a heating and drying device for sheet-shaped objects that can achieve downsizing of the device and energy saving. [Means to solve the problem]

According to the heating and drying device for sheet objects of the present invention, it is provided with a heating chamber arranged in the frame, and a plurality of turning-back guides arranged at the top position and the bottom position of the heating chamber, so as to guide the continuous shape into the heating chamber. The sheet passes through the plurality of return guides in a serpentine state, and the sheet is heated and dried.

In the heating chamber, there is a serpentine channel for the sheet to snake through, and the two sides of the serpentine channel for the sheet to move in a meander between the top position and the bottom position of the return guide are opposite to each other. And a plurality of plate-shaped heating elements are arranged in a close manner.

In the heating and drying device of the present invention, the continuous sheets introduced into the heating chamber move in a meandering state through a plurality of return guides provided at the top and bottom positions. During this period, the zigzag-moving sheet receives radiant energy from a plurality of plate-shaped heating elements arranged on both sides in a close manner, and heats and dries the sheet with high efficiency.

For example, when drying the printed surface or painted surface of a sheet, the sheet is dried while meandering in the heating chamber, and when annealing the sheet, the synthetic resin sheet is subjected to heat while snaking. Annealed by heating.

At this time, the sheet is heated by receiving radiant energy (such as near-infrared rays, far-infrared rays, etc.) Electric power, very efficient drying or annealing of flakes.

Also, the turn-back guide does not need to be movable up and down like the conventional ones. Furthermore, the sheet moves up and down in the heating chamber, so the length, width, and depth of the frame of the heating chamber are relatively short. Instead, it can be configured concisely. Thereby, the whole device including the auxiliary equipment can be miniaturized, the manufacturing cost can be reduced, and the space-saving of the installation place can be achieved.

Here, in the above-mentioned heating and drying device, the above-mentioned serpentine channel is arranged with the return guide part inside, and a plurality of plate-shaped heating elements are arranged in parallel in the heating chamber, and can be heated by separating them with the plate-shaped heating elements. room to form a serpentine channel. In addition, a heating plate may be provided on the turn-back guide. Thereby, even in a narrow heating chamber, a sufficiently long meandering passage can be efficiently made in a space-saving manner, and the housing can be further miniaturized.

In addition, another sheet heating and drying device of the present invention is provided with a heating chamber arranged in the frame, and a plurality of return guides arranged at the top position and the bottom position of the heating chamber, so that the heat introduced into the heating chamber The continuous sheet-like article passes through the plurality of return guide parts in a serpentine state, and the sheet-like article is heated and dried.

In the heating chamber, a meandering passage is provided for the sheet to snake through. The meandering passage is formed by dividing the heating chamber with a partition wall, and a heating gas supply part is provided in the heating chamber outside the partition wall. , and the partition wall on both sides of the straight line portion of the serpentine channel is provided with a perforated plate, and the heating gas from the heating gas supply part is blown into the serpentine channel through the perforated plate.

In this heating and drying device, the continuous sheet material introduced into the heating chamber moves in a meandering state through a plurality of return guides provided at the top position and the bottom position. During this period, the partition walls on both sides of the straight portion of the serpentine passage are provided with perforated disks, and the heating gas from the heating gas supply part is blown into the serpentine passage through the holes of the perforated disks. In this way, the straight part of the sheet receives hot air from the perforated disks on both sides, and the sheet is efficiently heated and dried while moving.

For example, when drying a printed surface or a painted surface of a sheet, it is dried by meandering in a heating chamber, and when annealing a synthetic resin sheet, the sheet is heated and annealed.

At this time, the sheet is heated by receiving the hot air blown out from the perforated disks of the heating gas supply part on both sides of the straight part, so it can be heated in a very short time and with less power consumption. Efficiently dry or anneal the sheet.

Here, in the above-mentioned heating and drying device, a floating air blowing pipe for turning and sending the sheet in a non-contact manner may be provided on the turning-back guide part, and a plurality of blowing holes may be provided on the outer peripheral curved surface of the floating blowing pipe. By installing the air blower for flotation on the turn-back guide part, the sheet can be floated from the outer peripheral surface of the blower blower for flotation through the airflow ejected from the blower hole and move back and forth in the turn-back guide part, so there is no sheet The contact and friction of the surface can prevent the damage of the surface. [Invention effect]

Through the heating and drying device for sheets of the present invention, the heating and drying device can be miniaturized, the consumption of power supplied to the plate-shaped heating element can be reduced, and the power consumption of the heat source of the hot air supplied to the blowpipe for flotation can be suppressed, so it can Achieve energy saving.

Hereinafter, one embodiment of the present invention will be described based on the drawings. As shown in Figures 1 to 5, the heating and drying device is formed in the shape of a vertically elongated cuboid, and a square box-shaped frame 1 is provided at the front thereof. On one side of the facing side walls 3 of the frame body 1, an inlet 8 for introducing the sheet is provided, and an outlet 9 for leading out is provided on the other side. At the entrance 8 and the exit 9, guide rollers 14, 15 are provided on shafts in a freely rotatable manner to guide the sheets and lead them in or out. A front door 4 is installed at the front portion of the frame body 1 . As shown in Fig. 5, the heating and drying device including the frame body 1 is formed in a vertically long square box shape, and the installation space is minimized.

As shown in Figure 4, a heating chamber 2 is provided in the frame body 1. In the heating chamber 2, a plurality of plate-shaped heating elements 20 are spaced apart and arranged in parallel and installed in the longitudinal direction, thereby forming a serpentine channel that snakes up and down. 6. The plate-shaped heating element 20 is composed of five plate-shaped heating elements including the first heating plate 21 to the fifth heating plate 25, and each heating plate divides the heating chamber 2 longitudinally, thereby forming a serpentine passage 6 in the heating chamber 2 .

Inside the serpentine passage 6, a plurality of (5) turn-back guides 10 are arranged at each top position and each bottom position of the serpentine passage 6 in the heating chamber 2, so as to make the sheet move in a serpentine manner. The turn-back guide 10 is composed of two guide rollers 16, 17 at the top position and three blowing pipes 11, 12, 13 for flotation at the bottom position.

The guide rollers 16 and 17 are driven rollers that can rotate freely, and guide the sheets that are introduced into or exported from the heating chamber 2 . Furthermore, guide rollers 14 and 15 are provided inside the inlet 8 and the outlet 9 . These guide rollers 14-17 and blowing pipes 11-13 for floating constitute the conveying belt in the serpentine channel 6 in the heating chamber 2, but the driving device for moving the sheet is not located in the frame body 1, but It is to move the sheet through an external coiler, etc.

As shown in Figure 4, the blowing pipes 11, 12, 13 for floating at the bottom of the turning guide part 10 are provided with a plurality of holes through the outer peripheral surface of the bottom of the pipe, and the end of the pipe is connected to the air supply duct from the blower 7. . The air supplied from the blower 7 is ejected from the hole at the bottom of the tube. The bottom (bottom) of the air blowing pipes 11, 12, and 13 for floating is formed into a semi-cylindrical shape, and a plurality of air blowing holes are penetrated on its semicircumferential surface, and air is ejected from these holes to the outer peripheral portion, so that air passing through the outer peripheral portion of the pipe The sheet is lifted and guided so that it passes through the turnback.

Blowing pipes 11, 12, 13 for floating are arranged on the lower side of the bottom of the turn-back guide part 10, whereby the sheet is easily separated from the pipe, and the contact between the sheet and the pipe is effectively avoided. Also, the bottom of the heating chamber 2 is provided with a suction port, and the suction port is connected to the suction side of the blower 7 with a conduit, so that the air ejected into the heating chamber 2 can be recycled, thereby preventing The temperature in the heating chamber 2 drops unnecessarily.

As shown in FIG. 4, the plate-shaped heating element 20 is composed of a first heating plate 21, a second heating plate 22, a third heating plate 23, a fourth heating plate 24, and a fifth heating plate 25. These plate-shaped heating elements 20 The heating plate generally reaches the top from the bottom in the cuboid space, that is, the heating chamber 2, and has a width that reaches approximately from the front in the heating chamber 2 to the back. The first heating plate 21 to the fifth heating plate 25 of the plate-like heating element 20 in such a rectangular shape are arranged upright in parallel with intervals as shown in FIG. The bottom ends are alternately fixed on the bottom and the top, and a serpentine channel 6 is formed in the heating chamber 2 .

That is, the first heating plate 21 of the plate-shaped heating element 20 has its top end installed directly above the blow pipe 11 for floating, and the bottom end of the second heating plate 22 is vertically installed on the bottom plate at the position directly below the guide roller 16. superior. Similarly, the top end of the 3rd heating plate 23 is installed directly above the blow pipe 12 for floating, and the bottom end of the 4th heating plate 24 is vertically installed on the base plate at the position directly below the guide roller 17. The 5th heating plate 25 The top end is vertically installed directly above the blowpipe 13 for floating.

That is, as shown in FIG. 4 , the serpentine channel 6 is composed of the first heating plate 21, the second heating plate 22, the third heating plate 23, the fourth heating plate 24, and the fifth heating plate 25, and the five plate-shaped heating plates The body 20 is arranged parallel and upright at predetermined intervals, and these heating plates are used as partition plates to separate the heating chamber 2, and are formed in the heating chamber 2 by separating the first heating plate 21 to the fifth heating plate 25. Serpentine passage 6.

Therefore, the space in the heating chamber 2 can be utilized very efficiently. Even if the heating chamber 2 is small and narrow, a sufficiently long serpentine passage 6 can still be made in the heating chamber 2 . Thereby, the size of the frame body 1 of the heating and drying apparatus can be reduced in size, and space saving can be achieved when installing the apparatus.

The plate-shaped heating element 20, that is, the first heating plate 21, the second heating plate 22, the third heating plate 23, the fourth heating plate 24, and the fifth heating plate 25, for example, can use a carbon heater, a graphite heater, a clamp Far-infrared panel heaters such as sleeve heaters, ceramic heaters, etc., or PTC planar heaters, etc. Also, these plate-shaped heating elements 20 are heating plates whose front and back sides are both heat-generating surfaces. Again, when the plate-shaped heating element 20 is a graphite heater using a graphite carbon planar heating element, this planar heating element can be easily formed into a plate shape, and moreover, it can be coated with graphite or the like on its surface to carry out black treatment, so as to Improve heating and heat release effect.

As shown in Figure 4, in the snake passage 6 that is long up and down and snakes to the left and right, the two guide rollers 16, 17 on the top and the three floating blow pipes 11, 12, 13 on the bottom are alternately staggered. It is configured in the manner of equal left and right positions. Thereby, the turn-back guide part 10 is formed in the position of each guide roller and each blowing pipe for flotation. And, on both sides of the straight line portion of the meandering channel 6 that is connected to each turnback guide portion 10, the plate-shaped heating element 20 that separates the meandering channel 6 is arranged, that is, the first heating plate 21, the second heating plate 22, and the third heating plate 20. The heating plate 23 , the fourth heating plate 24 and the fifth heating plate 25 .

Through the above structure, even in a very narrow heating chamber 2, the serpentine passage 6 can still form a sufficiently long passage, and exert excellent heating efficiency, so that long and flat sheets stay in the heating chamber 2 for a period of time required for drying. Enough time and moving at the same time, heat and dry processing can be performed efficiently. In addition, by this, the frame body 1 having the heating chamber 2 can be extremely miniaturized, and the installation place of the device can also be very space-saving.

Furthermore, as shown in FIG. 4, the plate-shaped heating element 20 is disposed close to the two sides of the straight line portion of the sheet moving in the serpentine passage 6, so that it can be efficiently performed with less power consumption. The heat-dried structure of the sheet. The energization to the plate-shaped heating element 20 is controlled through a temperature regulator or the like so that the temperature in the heating chamber 2 and the temperature of the plate-shaped heating element 20 become suitable for drying or heat treatment.

In addition, in the heating and drying device of this embodiment, the driving device for conveying and driving the sheets in the serpentine passage 6 is not provided on the frame body 1 . The movement of the sheet is carried out by the driving device of the drawer that pulls the sheet out from the drum and/or the drive device of the coiler that winds the sheet sent out from the outlet provided outside the heating and drying device. Of course, the heating and drying device can also be provided with a driving device for conveying the sheet.

Also, the blowpipes 11, 12, 13 for flotation are only arranged at the bottom position in the serpentine channel 6, but the blowpipes for flotation can also be set at the top position, that is, the position of the guide rollers 16, 17.

Next, the operation of the heating and drying apparatus configured as described above will be described. Sheets W subjected to drying or heat treatment are continuous thin synthetic resin sheets or films, or elongated flat sheets printed or painted on sheets or films, flexible circuit boards, Display switch substrates such as panel display switches, or continuous metal foil or synthetic resin sheets that have been annealed.

The continuous sheet W is wound up on an unillustrated unwinder. Before the heating and drying process starts, the sheet is drawn out from the unwinding machine, and as shown in Figure 4, it is inserted into the heating chamber 2 from the inlet 8 of the heating and drying device, and passes through the serpentine channel 6 in the heating chamber 2, and the sheet is set. Shape W. The front end of the sheet W drawn out from the outlet 9 of the side wall of the frame body 1 is connected to a coiler not shown in the figure. The surface such as the printing surface of the sheet W is inserted from the inlet 8 as the top surface. The sheets W are moved in the heating chamber 2 by driving the coiler.

In the heating and drying device, the blower 7 starts to operate and sends air to the floating blowing pipes 11-13 at the bottom of the room, and energizes the plate-shaped heating element 20 in the heating room 2 to raise the temperature until the temperature in the heating room 2 reaches a suitable temperature. At the temperature of drying treatment or heat treatment. In this state, the coiler operates so that the sheet W is coiled by the coiler and enters the heating chamber 2 from the entrance 8 . The speed at which the sheet W moves in the heating chamber 2 is an optimum speed by adjusting the winding speed of the coiler according to the type of the sheet W.

In this state, the surface of the sheet W becomes the surface side of the floating blow pipes 11 to 13, and the sheet W is floated and moved by the air blown out from the floating blow pipes, so the surface of the sheet W does not move. Friction damage, etc. will occur.

The continuous sheet W introduced into the heating chamber 2 snakes through the return guides 10 provided at the top and bottom positions, and moves in the snake passage 6 . During this period, in the linear part of the sheet W, the radiation energy is received from the plate-shaped heating elements 20 arranged oppositely near the two sides, and the sheet W is heated and dried efficiently. For example, when drying the printed surface or the painted surface of the sheet W, the sheet is dried while meandering in the heating chamber 2, and on the other hand, when annealing the sheet made of synthetic resin, the sheet The object is heated to a predetermined temperature while snaking and annealed.

At this time, the sheet W is heated by receiving radiant energy (such as heat radiation such as near-infrared rays and far-infrared rays) from the plate-shaped heating elements 20 arranged near both sides of the straight line portion at a close distance, so it can be heated in a very short distance. Drying or annealing of the sheet W is performed very efficiently in a short period of time and with less power consumption.

FIG. 6 shows an example in which heating plates 28 and 29 are additionally installed in the heating chamber 2 as the plate-shaped heating element 20 in the heating and drying device of the above embodiment. The heating plate 28 is installed downwards on the top of the serpentine channel 6 , that is, above the guide rollers 16 and 17 of the return guide portion 10 . Also, the heating plate 29 is installed upwardly at the bottom of the meandering passage 6, that is, below the blowing pipes 11, 12, 13 for floating of the return guide portion 10.

For the heating plates 28 and 29 , for example, far-infrared panel heaters using carbon heaters, graphite heaters, jacket heaters, ceramic heaters, etc., or PTC planar heaters, etc. can be used. The configuration of the shape of the serpentine channel 6 and the positions of the inlet 8 and the outlet 9 are the same as those of the above-mentioned embodiments shown in FIGS. 1 to 5 .

Through this heating and drying device, when the sheet W passes through the serpentine channel 6 in the heating chamber 2, it receives radiation energy (such as near infrared rays, heat radiation such as far-infrared rays) to be heated, moreover, the reentry guide portion 10 at the top and bottom of the serpentine channel 6 also receives the radiant energy from the heating plates 28, 29 at a close position, so it can be heated in a very short time. In addition, with less power consumption, drying or annealing of the sheet W is performed very efficiently.

Fig. 7 shows a sectional view of still another embodiment. The heating and drying device of this embodiment is shown in FIG. 7. In the heating chamber 32 of the frame body 31, the meandering passage 36 through which the sheet W snakes through is separated by dividing the heating chamber 32 with a partition wall 48. form. The turn-back guides 40 are disposed on the inside of two top positions and three bottom positions of the meandering passage 36 . In the heating chamber 32 outside the partition wall 48 that separates the serpentine passage 36, a heating gas supply part 49 is provided, and the partition wall 48 on both sides of the straight line portion of the serpentine passage 36 is provided with an opening plate 58, through which the opening plate 58 , blowing the heating gas from the heating gas supply part 49 into the serpentine channel 36 .

That is, as shown in Figure 7, at the two top positions in the serpentine passage 36, the guide rollers 46, 47 are set on the shaft as the return guide 40 in a freely rotatable manner, and at the three bottoms in the serpentine passage 36. position, the guide rollers 41, 42, 43 are arranged on the shaft in a freely rotatable manner. An inlet 38 is provided on one side wall of the heating chamber 32, a guide roller 44 is rotatably arranged inside the inlet 38, and a guide roller 45 is rotatably arranged inside the outlet 39 provided on the other side wall.

In the heating chamber 32 , a heating gas supply part 49 covering the meandering channel 36 from above and below is formed outside the meandering channel 36 . On the upper side of the heating gas supply part 49 at the top, three supply conduits 56 for supplying heating gas are connected. The three supply conduits 56 are connected to the top of the heating chamber 32, and pass through the heating gas supply part 49 to the serpentine channel 36. The straight line part, that is, the part where the perforated disk 58 is arranged, sends out the heating gas, and the heating gas is supplied from the perforated disk 58 into the serpentine channel 36 .

Similarly, on the lower side of the heating gas supply part 49 at the bottom, two supply conduits 57 for supplying heating gas are connected. The two supply conduits 57 are connected to the bottom of the heating chamber 32, and pass through the heating gas supply part 49 to The straight portion of the serpentine channel 36 , that is, the part where the perforated disk 58 is disposed sends out heating gas, and the heated gas from the perforated disc 58 is supplied into the serpentine channel 36 . On the surface of the perforated disk 58, black treatment such as carbon graphite can be implemented to radiate heat rays efficiently. At the root of the supply ducts 56 and 57, a heating blower 37 is connected as shown in FIG. 7 . The heating blower 37 generates heated air or superheated steam at a temperature suitable for heating and drying, and supplies the heated air to the supply ducts 56 and 57 .

Furthermore, in the part of the serpentine channel 36 that descends straight down from the entrance 38 of the heating chamber 32, that is, on both sides of the serpentine channel 36 directly below the entrance 38, the heating plate 55 of the plate-shaped heating element is arranged. The sheet W is sandwiched from the vicinity of both sides. Similarly, on both sides of the serpentine channel 36 directly below the outlet 39, the heating plates 55 of the plate-shaped heating element are arranged so as to sandwich the sheet W from the vicinity of both sides. The heating plate 55 is a plate-shaped heating element similar to the first heating plate 21 to the fifth heating plate 25 described above.

As shown in FIG. 7, these heating plates 55 are located directly under both the inlet 38 and the outlet 39, but can also be selected to be located directly under either the inlet 38 or the outlet 39 according to the type of sheet W. In addition, the heating plate 55 may not be provided at all, and only the heating gas may be used for heating.

Also, guide rollers 41-43, 46, 47 are provided at the top and bottom positions in the serpentine passage 36, but instead of these guide rollers 41-43, 46, 47, blow pipes for flotation may be provided. In this case, what is necessary is just to supply heating gas from the heating blower 37 to the air blowing pipe for flotation.

Also, the partition wall 48 above the guide rollers 46, 47 and the partition wall 48 below the guide rollers 41-43 may be provided with holes for ejecting gas so as to supply the heating gas from the heating gas supply part 49 on the outside. It is supplied into the serpentine channel 36 to further improve the heating and drying efficiency.

Next, the operation of the heating and drying apparatus configured as described above will be described. The sheet W is wound up by an unshown unwinder. Before the heating and drying process starts, the sheet is drawn out from the unwinding machine, and as shown in Figure 7, it is inserted into the heating chamber 32 from the inlet 38 of the heating and drying device, and the sheet is set through the serpentine passage 36 in the heating chamber 32. Object W. The front end of the sheet W drawn out from the outlet 39 of the side wall of the frame 31 is connected to a coiler not shown in the figure.

In the heating and drying apparatus, the heating blower 37 starts to operate, and supplies heating gas to the heating gas supply part 49 through the supply ducts 56 and 57 . The heating gas entering the heating gas supply part 49 passes through a plurality of holes in the perforated disk 58 arranged on both sides of the straight line portion of the serpentine passage 36, so that the heating gas is ejected into the serpentine passage 36, so that the temperature in the heating chamber 32 Rise to a temperature suitable for heating and drying. In this state, the coiler operates, and the sheet W enters the serpentine passage 36 in the heating chamber 32 from the entrance 38 while being coiled by the coiler. The speed at which the sheet W moves in the serpentine channel 36 corresponds to the type of the sheet, and the winding speed of the coiler is adjusted to become the most appropriate speed.

The continuous sheet W introduced into the serpentine passage 36 of the heating chamber 32 moves in the serpentine passage 36 while snaking through the return guide 40 provided at the top position and the bottom position, and the continuous straight passage . During this period, in the linear part of the sheet W, the heating gas is blown to both sides of the sheet W through the holes of the perforated disks 58 which are arranged opposite to each other, so as to efficiently heat and dry the sheet W. . For example, when drying the printed surface or the painted surface of the sheet W, the sheet is dried while meandering in the heating chamber 32, and on the other hand, annealing of the synthetic resin sheet is performed. In this case, the flakes are heated to a predetermined temperature while zigzagging and annealed.

In addition, the sheet W receives radiant energy (such as heat radiation such as near-infrared rays and far-infrared rays) from the heating plate 55 disposed directly below the inlet 38 and directly below the outlet 39 from a short distance, and is heated and dried. The heating and drying by means of radiant energy from the heating plate 55 can finely adjust and control the energy, so that the optimal heating can be performed for drying or annealing of the sheet W according to the material and surface state of the surface of the sheet W. Dry processing.

Also, in the heating and drying device of the embodiment shown in FIG. 7 , a heating plate may also be provided on the channel side of the partition wall 48 of the return guide part 40 of the serpentine channel 36 , and the sheet is also heated at the return guide part 40 . In this way, the radiant energy passing through the heating plate 55, the heated air from the heating gas supply part 49, and the radiant energy from the heating plate of the turning guide part 40 together efficiently heat-process the sheets passing through the serpentine channel 36. .

1: frame 2: Heating chamber 3: side wall 4: Front door 6: Serpentine channel 7: Blower 8: entrance 9: export 10: Turn back guide 11: Floating with a blower 12: Blowpipe for floating 13: Blowpipe for floating 14: guide roller 15: guide roller 16: guide roller 17: guide roller 20: plate heating element 21: 1st heating plate 22: The second heating plate 23: The 3rd heating plate 24: The 4th heating plate 25: The 5th heating plate 28: Heating plate 29: Heating plate 31: frame 32: Heating chamber 36: Serpentine channel 37: Heating blower 38: Entrance 39: Export 40: Turnback Guide 41: guide roller 42: guide roller 43: guide roller 44: guide roller 45: guide roller 46: guide roller 47: guide roller 48: Partition wall 49: Heating gas supply part 55: heating plate 56: Supply conduit 57: Supply conduit 58: Hole plate W: Flakes

Fig. 1 is a front view showing a heating and drying device according to an embodiment of the present invention. Fig. 2 is a top view showing the heating and drying device. Fig. 3 shows the right side view of the heating and drying device. Fig. 4 is an enlarged sectional view of IV-IV of Fig. 3 of the heating and drying device. Fig. 5 is a perspective view of the heating and drying device with the front door and the rear cover removed. Fig. 6 is a sectional view showing another embodiment. Fig. 7 is a sectional view showing still another embodiment.

1: frame

2: Heating chamber

3: side wall

6: Serpentine channel

8: entrance

9: export

10: Turn back guide

11: Floating with a blower

12: Blowpipe for floating

13: Blowpipe for floating

14: guide roller

15: guide roller

16: guide roller

17: guide roller

20: plate heating element

21: 1st heating plate

22: The second heating plate

23: The 3rd heating plate

24: The 4th heating plate

25: The 5th heating plate

W: Flakes

Claims (8)

A device for heating and drying sheets, comprising: a heating chamber located in the frame; and, Multiple turn-back guides are located at the top and bottom of the heating chamber; The heating and drying device for sheets allows the continuous sheets introduced into the heating chamber to pass through the plurality of reentrant guides in a meandering state to heat and dry the sheets; In the heating chamber, a serpentine channel for the sheet to snake through is provided, and the two sides of the serpentine channel for the sheet to move in a meander between the top position and the bottom position of the return guide are opposite to each other. And a plurality of plate-shaped heating elements are arranged in a close manner. The heating and drying device for sheets according to claim 1, wherein, The meandering channel is arranged in such a way that the turn-back guide part is arranged on the inside; the plurality of plate-shaped heating systems are arranged in parallel with spaces in the heating chamber; formed by separation. The heating and drying device for sheets according to claim 2, wherein, A heating plate is provided on the return guide. A device for heating and drying sheets, comprising: a heating chamber located in the frame; and, Multiple turn-back guides are located at the top and bottom of the heating chamber; The heating and drying device for sheets allows the continuous sheets introduced into the heating chamber to pass through the plurality of return guides in a serpentine state, and heat and dry the sheets; In the heating chamber, a meandering passage is provided for the sheet to meander through. The meandering passage is formed by dividing the heating chamber with a partition wall, and a heating gas supply part is provided in the heating chamber outside the partition wall. And the partition wall on both sides of the straight line portion of the meandering channel is provided with perforated plates, and the heating gas from the heating gas supply part is blown into the meandering channel through the perforated plates. The heating and drying device for sheets according to claim 1 or 4, wherein, A blowing pipe for floating is provided on the return guide part to return and send out the sheet in a non-contact manner, and a plurality of blowing holes are provided on the outer peripheral curved surface of the blowing pipe for floating. The heating and drying device for sheets according to claim 1 or 4, wherein, A guide roller for turning back the sheet and sending it out is provided on the turning guide part. The heating and drying device for sheets according to claim 5, wherein, The blowing pipe for floating is arranged at the turn-back guide part at the bottom position, and the turn-back guide part at the top position is provided with a guide roller for turning back the sheet and sending it out. The heating and drying device for sheets according to claim 4, wherein, A plate-shaped heating element is arranged near the entrance or exit of the heating chamber near both sides of the sheet moving in the serpentine channel.

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