CN117178157A - Heating and drying device for sheet-like material - Google Patents

Abstract

In a heating and drying device for a sheet, a heating chamber (2) in a housing (1), a plurality of folding guide sections (10) are provided at upper and lower positions in the heating chamber (2), and a continuous sheet introduced into the heating chamber (2) is caused to pass through the plurality of folding guide sections (10) in a meandering state. A plurality of plate-shaped heating elements (20) are provided opposite and close to each other on both sides of a straight portion of the sheet-like object that moves between a folding guide portion (10) at an upper position and a lower position, and a meandering path (6) is formed in the heating chamber (2) by using the plate-shaped heating elements (20) as partition walls.

Description

Heating and drying device for sheet-like material

Technical Field

The present invention relates to a heating and drying apparatus for continuously heating or drying a sheet while continuously conveying the sheet in a heating chamber, and more particularly, to a heating and drying apparatus for a sheet capable of efficiently heating and drying a sheet and capable of miniaturizing the apparatus.

Background

For example, patent document 1 and the like described below disclose a heat drying apparatus that performs heat drying of a continuous sheet while moving the sheet in a heating chamber in order to dry the surface of the sheet after printing or coating, for example, or in order to anneal the sheet after molding, for example.

The heating and drying apparatus of patent document 1 is configured such that heating sections such as electric heaters are disposed at upper and lower portions in a heating chamber having a cubic or rectangular parallelepiped shape, 4 pairs of upper movable rollers and lower movable rollers are alternately disposed in a staggered manner in the vicinity of the center in the heating chamber, and a sheet introduced into the heating chamber is passed through the upper movable rollers and the lower movable rollers in a meandering manner up and down, thereby performing heating and drying of the sheet.

In this heat drying apparatus, when the dryness of the sheet is increased, the position of the upper movable roller is increased, the lower movable roller is lowered, and the meandering distance of the sheet is increased. Thereby, the residence time of the sheet in the heating chamber is prolonged, and the dryness is improved. On the other hand, when the dryness of the sheet is reduced, the position of the upper movable roller is lowered, the lower movable roller is raised, and the meandering distance of the sheet is shortened, whereby the time for which the sheet stays in the heating chamber is shortened, and the dryness is reduced.

Prior art literature

Patent literature

Patent document 1: japanese patent No. 5535755

Disclosure of Invention

Problems to be solved by the invention

However, the heating units (electric heaters) of the above-described heating and drying apparatus are disposed only in the upper and lower portions of the heating chamber, and basically the temperature of the entire heating chamber is controlled to a temperature suitable for heating and drying the sheet-like material by the heating operation of the upper and lower heating units. The length of the vertically meandering sheet, that is, the time the sheet stays in the heating chamber is used to adjust the heating dryness according to the type of the sheet.

Therefore, in the process of moving up and down the upper and lower movable rollers in the 4 pairs, the heating portions disposed at the upper and lower portions in the heating chamber are operated so as to maintain the temperature of the wide heating chamber space at a temperature suitable for the heating and drying of the sheet-like material, and even in the heating and drying of the sheet-like material having a relatively low dryness, the electric power consumption of the electric heater of the heating portion is hardly changed.

Further, when the length of the meandering sheet is increased, the distance from the heating unit to the sheet is inevitably increased, the radiant heat from the heater is less likely to reach the sheet, the heating efficiency of the heating unit is reduced, the heating and drying time is increased, and the power consumption is increased. Further, this heat drying apparatus is required to be provided with a moving mechanism for moving the upper movable roller and the lower movable roller up and down, and there is a problem that the apparatus is large in size and the manufacturing cost is also increased, and downsizing and energy saving of the apparatus are desired.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a heating and drying apparatus for a sheet-like material, which can achieve downsizing and energy saving of the apparatus.

Solution for solving the problem

The present invention relates to a heating and drying device for a sheet-like object, comprising: a heating chamber provided in the housing; and a plurality of folding guides provided at upper and lower positions in the heating chamber, through which a continuous sheet introduced into the heating chamber passes in a meandering state, and which perform heat drying of the sheet,

a meandering path through which the sheet passes in a meandering manner is provided in the heating chamber, and a plurality of plate-shaped heating elements are provided in opposition and in proximity to each other on both sides of the meandering path in which the sheet moves in a meandering manner between the return guide portions in the upper position and the lower position.

In the heat drying apparatus of the present invention, the continuous sheet introduced into the heating chamber moves while passing through the plurality of folding guide portions provided at the upper and lower positions in a meandering state. During this time, the sheet moving in a meandering manner receives radiant energy from a plurality of plate-like heat generators provided on both sides in opposition and in proximity, and the sheet is efficiently heated and dried.

For example, in the case of drying a printed surface, a coated surface, or the like of a sheet, the sheet is dried while being moved in a meandering manner in a heating chamber, and in the case of annealing the sheet, the sheet made of a synthetic resin is heated while being moved in a meandering manner, and is annealed.

In this case, the sheet is heated by receiving radiation energy (for example, near infrared rays, far infrared rays, and the like) from the plate-like heating elements provided near both sides thereof in a short distance, and thus the drying and annealing treatment of the sheet can be performed very efficiently with a very short time and with a small amount of power consumption.

Further, the folding guide portion does not need to be movable up and down as in the conventional art, and the sheet is moved in a meandering manner up and down in the heating chamber, so that the length, width, and depth of the casing of the heating chamber are short, and the heating chamber can be compactly constructed. Accordingly, the entire device including the accessory device can be miniaturized, the manufacturing cost can be reduced, and the space in the installation place can be saved.

In the above-described heating and drying apparatus, the meandering path may be arranged inside and provided with a folding guide portion, and the plurality of plate-shaped heating elements may be arranged in parallel with each other with a space therebetween in the heating chamber, and the heating chamber may be partitioned by the plate-shaped heating elements to form the meandering path. In addition, a heating plate may be provided at the folding guide portion. Thus, even in a narrow heating chamber, a sufficiently long meandering path can be efficiently produced with further space saving, and the housing can be further miniaturized.

The present invention also provides a heating and drying device for another sheet-like material, comprising: a heating chamber provided in the housing; and a plurality of folding guides provided at upper and lower positions in the heating chamber, through which a continuous sheet introduced into the heating chamber passes in a meandering state, and which perform heat drying of the sheet,

a meandering passage through which the sheet material passes in a meandering manner is provided in the heating chamber, the meandering passage is formed by partitioning the heating chamber by a partition wall, a heating gas supply portion is provided in the heating chamber outside the partition wall, perforated plates are provided in the partition wall on both sides of a straight portion of the meandering passage, and heating gas of the heating gas supply portion is blown into the meandering passage through the perforated plates.

In this heat drying apparatus, a continuous sheet introduced into a heating chamber moves while passing through a plurality of folding guides provided at upper and lower positions in a meandering state. During this time, perforated plates are provided on the partition walls on both sides of the straight portion of the tortuous path, and the heated gas of the heated gas supply unit is blown into the tortuous path through the holes of the perforated plates. Thus, the straight portions of the sheet are heated and dried efficiently while the sheet moves by receiving hot air from the perforated plates on both sides.

For example, in the case of drying a printed surface, a coated surface, or the like of a sheet, the sheet is dried while being meandering in a heating chamber, and in the case of annealing a synthetic resin sheet, the sheet is heated and annealed.

At this time, the sheet is heated by the hot air discharged from the perforated plates of the heating gas supply units provided on both sides of the straight portion, and therefore, the drying and annealing treatment of the sheet can be efficiently performed in a very short time and with a small power consumption.

Here, the above-described heating and drying apparatus may have the following structure: the return guide portion is provided with a floating blow-out pipe for returning and conveying the sheet in a noncontact manner, and a plurality of blow-out holes are provided in an outer peripheral curved surface of the floating blow-out pipe. By providing the floating blow-out pipe in the return guide portion, the sheet floats from the outer peripheral curved surface of the floating blow-out pipe by the air flow discharged from the blow-out hole and moves in a return manner in the return guide portion, and therefore, contact and friction of the surface of the sheet can be eliminated, and damage to the surface can be prevented.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the heating and drying device for a sheet-like object of the present invention, the heating and drying device can be miniaturized, the power consumption to be supplied to the plate-like heating element can be reduced, the power consumption of the heat source of the hot air to be supplied to the floating blow-out pipe can be suppressed, and energy saving can be achieved.

Drawings

Fig. 1 is a front view showing a heat dryer according to an embodiment of the present invention.

Fig. 2 is a plan view of the heat drying apparatus.

Fig. 3 is a right side view of the heat drying apparatus.

Fig. 4 is an enlarged cross-sectional view of IV-IV of fig. 3 of the heat drying apparatus.

Fig. 5 is a perspective view of the heating and drying apparatus with the front door and the rear cover removed.

Fig. 6 is a cross-sectional view showing another embodiment.

Fig. 7 is a cross-sectional view showing still another embodiment.

Detailed Description

An embodiment of the present invention will be described below with reference to the drawings. As shown in fig. 1 to 5, the heat dryer is formed in a rectangular parallelepiped shape, and a square box-shaped casing 1 is provided at the front part thereof. One of the opposite side walls 3 of the housing 1 is provided with an inlet 8 for the incoming sheet and the other is provided with an outlet 9 for the outgoing sheet. Guide rollers 14 and 15 for guiding the sheet into and out of the inlet 8 and the outlet 9 are rotatably and pivotally provided. A front door 4 is mounted on the front of the housing 1. As shown in fig. 5, the heat drying apparatus including the housing 1 is formed in a rectangular square box shape, and the installation space is minimized.

As shown in fig. 4, a heating chamber 2 is provided in a housing 1, and a plurality of plate-like heating elements 20 are arranged in parallel at intervals in the longitudinal direction of the heating chamber 2, so that a meandering path 6 is formed so as to meander in the longitudinal direction. The plate-like heating element 20 is constituted by 5 plate-like heating elements including a 1 st heating plate 21 to a 5 th heating plate, each of which longitudinally separates the inside of the heating chamber 2, and thereby a meandering passage 6 is formed in the heating chamber 2.

Inside the meandering path 6, a plurality of (5) folding guide portions 10 are provided at each upper position and each lower position in the meandering path 6 in the heating chamber 2 in order to move the sheet in a meandering manner. The return guide portion 10 is composed of two guide rollers 16, 17 at the upper position and 3 floating blow-out pipes 11, 12, 13 at the lower position.

The guide rollers 16 and 17 are rotatably driven rollers, and guide the sheet introduced into or discharged from the heating chamber 2. Guide rollers 14 and 15 are provided inside the inlet 8 and the outlet 9. These guide rollers 14 to 17 and the floating blow-out pipes 11 to 13 constitute a conveying conveyor in the meandering path 6 of the meandering inside the heating chamber 2, but the casing 1 is not provided with a driving device for moving the sheet, and the sheet is moved by an external winder or the like.

As shown in fig. 4, in the floating blow-out pipes 11, 12, 13 at the lower positions of the return guide portions 10, a plurality of holes are formed in the lower outer peripheral surfaces of the pipes, and air supply pipes from the blower 7 are connected to the ends of the pipes. The air supplied from the blower 7 is ejected from the hole at the bottom of the tube. The lower parts (bottoms) of the floating blow-out pipes 11, 12, 13 are formed in a semi-cylindrical shape, a plurality of blow-out holes are bored in the semi-circumferential surfaces thereof, air is blown out from the holes toward the outer circumferential parts, and the sheet passing through the outer circumferential parts of the pipes is guided while being floated.

The floating blow pipes 11, 12, 13 are disposed below the lower part of the return guide portion 10, whereby the sheet is easily separated from the pipe, and contact between the sheet and the pipe is effectively avoided. Further, an air inlet is provided at the bottom of the heating chamber 2, and the air inlet is connected to the air inlet side of the blower 7 by a duct, so that the air discharged into the heating chamber 2 can be circulated, and thus, the temperature in the heating chamber 2 can be prevented from being unnecessarily lowered.

As shown in fig. 4, the plate-like heat generating body 20 includes a 1 st heating plate 21, a 2 nd heating plate 22, a 3 rd heating plate 23, a 4 th heating plate 24, and a 5 th heating plate 25, and the heating plates of these plate-like heat generating bodies 20 reach substantially the top from the bottom in the heating chamber 2 as a rectangular parallelepiped space, and have a width from substantially the front to substantially the back in the heating chamber 2. As shown in fig. 4, the 1 st to 5 th heating plates 21 to 25 of the rectangular plate-like heating element 20 are arranged in parallel with each other at a distance in the longitudinal direction, and the upper and lower ends of the heating plates arranged in parallel are alternately fixed to the bottom and top to form a meandering path 6 in the heating chamber 2.

That is, the 1 st heating plate 21 of the plate-like heating element 20 is attached with its upper end portion directly above the floating blow-out pipe 11, and the 2 nd heating plate 22 is attached with its lower end portion vertically on the substrate at a position directly below the guide roller 16. Similarly, the 3 rd heating plate 23 is attached with its upper end portion directly above the floating blow-out pipe 12, the 4 th heating plate 24 is attached with its lower end portion vertically on the substrate at a position directly below the guide roller 17, and the 5 th heating plate 25 is attached with its upper end portion vertically directly above the floating blow-out pipe 13.

That is, as shown in fig. 4, 5 plate-shaped heating elements 20 including a 1 st heating plate 21, a 2 nd heating plate 22, a 3 rd heating plate 23, a 4 th heating plate 24, and a 5 th heating plate 25 are arranged in parallel in the longitudinal direction with a predetermined interval therebetween, and these heating plates serve as partition plates to partition the heating chamber 2, and the 1 st heating plate 21 to the 5 th heating plate 25 are partitioned to form the tortuous path 6 in the heating chamber 2.

Therefore, even if the heating chamber 2 is small in size and narrow in size, the space in the heating chamber 2 is used very efficiently, and a sufficiently long tortuous path 6 can be formed in the heating chamber 2. Thereby, the size of the casing 1 of the heating and drying apparatus can be reduced, and space can be saved when the apparatus is installed.

As the 1 st heating plate 21, 2 nd heating plate 22, 3 rd heating plate 23, 4 th heating plate 24, and 5 th heating plate 25 of the plate-like heating element 20, for example, a far infrared ray panel heater, PTC planar heater, or the like to which a carbon heater, a graphite heater, a jacket heater, a ceramic heater, or the like is applied can be used.

The plate-like heat generating elements 20 are heating plates each having a heating surface formed on both the front and rear surfaces thereof. Further, in the case of using a graphite heater of a graphite carbon planar heating element as the planar heating element 20, the planar heating element can be easily formed in a plate shape, and the surface thereof can be subjected to black treatment by coating graphite or the like, thereby improving heat generation and heat radiation effects.

As shown in fig. 4, in the meandering path 6 which is vertically long and meandering in the left-right direction, the upper two guide rollers 16 and 17 and the lower 3 floating blow-out pipes 11, 12 and 13 are arranged so that the left-right positions thereof are alternately shifted. Thereby, the folding guide portion 10 is formed at the position of each guide roller and each floating blow-out pipe. Further, the 1 st heating plate 21, the 2 nd heating plate 22, the 3 rd heating plate 23, the 4 th heating plate 24, and the 5 th heating plate 25, which are plate-like heating elements 20 that separate the meandering path 6, are disposed on both sides of a straight portion of the meandering path 6 that is continuous with each turn-back guide portion 10.

According to the above configuration, the tortuous path 6 can be formed long enough even in the very narrow heating chamber 2, and excellent heating efficiency can be exhibited, and the long sheet can be moved while staying in the heating chamber 2 for a sufficient time required for drying, so that the heat drying process can be performed efficiently. In addition, the housing 1 having the heating chamber 2 can be made very compact, and the space for installing the apparatus can be made very small.

Further, as shown in fig. 4, the plate-like heating element 20 is disposed close to both sides of the straight portion of the sheet moving in the meandering path 6, and therefore, the sheet can be efficiently heated and dried with less power consumption. The energization of the plate-shaped heating element 20 is controlled by 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 are the temperatures optimum for the drying process or the heat treatment.

In the heating and drying apparatus according to the present embodiment, the driving device for driving and conveying the sheet in the meandering path 6 is not provided in the casing 1. The sheet is moved by a driving device of a drawer for drawing the sheet from the roller and/or a driving device of a winding machine for winding the sheet fed from the outlet, which are provided outside the heat drying device. Of course, the present heating and drying apparatus may be provided with a driving device for conveying the sheet.

The floating blow-out pipes 11, 12, 13 are provided only at the lower positions in the tortuous path 6, but may be provided at the upper positions, i.e., at the positions of the guide rollers 16, 17.

Next, the operation of the heating and drying apparatus having the above-described configuration will be described. The sheet W subjected to the drying treatment or the heat treatment is a continuous thin synthetic resin sheet or film, a long sheet obtained by printing or coating the sheet or film, a display switch board such as a flexible circuit board or a panel display switch, or a continuous metal foil or synthetic resin sheet, and is a member to be annealed.

The continuous sheet W is wound on a winding-out machine not shown. Before the start of the heat drying process, the sheet is drawn out from the roll-out machine, and as shown in fig. 4, the inlet 8 of the self-heating drying apparatus is inserted into the heating chamber 2, and the sheet W is placed through the meandering path 6 in the heating chamber 2. The tip of the sheet W led out from the outlet 9 of the side wall of the housing 1 is connected to a winding machine, not shown. The sheet W is inserted from the inlet 8 with its surface such as a printed surface as an upper surface. The sheet W moves in the heating chamber 2 by the drive of the winding machine.

In the heating and drying apparatus, the blower 7 is started to blow air to the floating blow-out pipes 11 to 13 at the lower part of the room, and the plate-like heating element 20 in the heating chamber 2 is energized to raise the temperature until the temperature in the heating chamber 2 reaches a temperature suitable for drying or heating. In this state, the winding machine is operated, and the sheet W is wound around the winding machine and enters the heating chamber 2 from the inlet 8. The winding speed of the winding machine is adjusted so that the speed at which the sheet W moves in the heating chamber 2 becomes the optimum speed according to the type of the sheet.

In this state, the surface of the sheet W is on the surface side of the floating blow pipes 11 to 13, but the sheet W floats and moves by the air blown out from the floating blow pipes, and therefore friction or the like does not occur on the surface of the sheet W.

The continuous sheet W introduced into the heating chamber 2 moves in a meandering path 6 by being meandering by the return guide portions 10 provided at the upper and lower positions. During this time, the plate-like heat generating elements 20 provided opposite and close to each other on both sides receive radiant energy at the straight portions of the sheet W, and the sheet is efficiently heated and dried. For example, in the case of drying a printed surface, a coated surface, or the like of the sheet W, the sheet is dried while being meandering in the heating chamber 2, whereas in the case of performing an annealing treatment of a synthetic resin sheet, the sheet is heated to a predetermined temperature while being meandering, and is annealed.

At this time, the sheet W is heated by receiving radiation energy (for example, heat rays such as near infrared rays and far infrared rays) from the plate-like heating elements 20 provided near both sides of the straight line portion in a short distance, and therefore, the drying and annealing process of the sheet W can be performed very efficiently in a very short time and with a small amount of power consumption.

Fig. 6 shows an example of a device in which heating plates 28 and 29 are further attached as plate-like heating elements 20 to the heating chamber 2 in the heating and drying device according to the above embodiment. The heating plate 28 is installed above the upper portion of the meandering path 6, that is, above the guide rollers 16, 17 of the turn-back guide 10, facing downward. The heating plate 29 is attached to the lower portion of the meandering path 6, that is, to the lower portion of the floating blow-out pipes 11, 12, 13 of the return guide portion 10 so as to face upward.

For example, far infrared panel heaters, PTC planar heaters, etc. to which carbon heaters, graphite heaters, jacket heaters, ceramic heaters, etc. are applied, are used as the heating plates 28, 29. The shape of the tortuous path 6, the positions of the inlet 8 and the outlet 9, and the like are the same as those of the embodiment shown in fig. 1 to 5.

According to this heat drying apparatus, the sheet W is heated by receiving radiant energy (for example, heat rays such as near infrared rays and far infrared rays) from the plate-like heating element 20 provided near both sides of the linear portion in a short distance when passing through the meandering path 6 in the heating chamber 2, and the radiant energy from the heating plates 28 and 29 is also received at the vicinity of the upper and lower return guide portions 10 in the meandering path 6, so that the drying and annealing process of the sheet W can be performed very efficiently in a very short time and with a small amount of power consumption.

Fig. 7 shows a cross-sectional view of yet another embodiment. In the heating and drying apparatus of this embodiment, as shown in fig. 7, a meandering path 36 for passing a sheet W in a meandering manner is formed in the heating chamber 32 of the housing 31 by dividing the heating chamber 32 by a partition wall 48. The return guide portion 40 is disposed inside two portions of the upper position and three portions of the lower position of the meandering path 36. A heating gas supply portion 49 is provided in the heating chamber 32 outside the partition wall 48 that separates the tortuous path 36, perforated plates 58 are provided on the partition wall 48 on both sides of the straight portion of the tortuous path 36, and the heating gas from the heating gas supply portion 49 is blown into the tortuous path 36 through the perforated plates 58.

That is, as shown in fig. 7, guide rollers 46 and 47 are rotatably and pivotally arranged as the folding guide portion 40 at upper positions of two portions in the tortuous path 36, and guide rollers 41, 42 and 43 are rotatably and pivotally arranged at lower positions of three portions in the tortuous path 36. An inlet 38 is provided in one side wall of the heating chamber 32, a guide roller 44 is rotatably disposed inside the inlet 38, and a guide roller 45 is rotatably disposed inside an outlet 39 provided in the other side wall.

Inside the heating chamber 32, a heating gas supply portion 49 is formed outside the meandering passage 36 so as to cover the meandering passage 36 from above and below. The upper side of the upper heating gas supply unit 49 is connected to 3 heating gas supply pipes 56. The 3 supply pipes 56 are connected to the upper portion of the heating chamber 32, and supply the heated gas from the perforated plate 58 into the tortuous path 36 by supplying the heated gas to the straight portion of the tortuous path 36, that is, the portion where the perforated plate 58 is disposed, through the heated gas supply portion 49.

Similarly, two supply pipes 57 for supplying the heating gas are connected to the lower side of the lower heating gas supply portion 49. Two supply pipes 57 are connected to the lower portion of the heating chamber 32, and supply the heating gas from the perforated plate 58 into the tortuous path 36 by supplying the heating gas to the straight portion of the tortuous path 36, that is, the portion where the perforated plate 58 is disposed, through the heating gas supply portion 49. The surface of the perforated plate 58 is subjected to black treatment such as carbon graphite, and heat rays can be efficiently radiated. As shown in fig. 7, a heating blower 37 is connected to the root of the supply pipes 56 and 57. The heating blower 37 generates heating air or superheated steam at a temperature suitable for heating and drying, and supplies the heating air or superheated steam to the supply pipes 56 and 57.

Further, a heating plate 55 of a plate-like heating element is disposed on both sides of the meandering path 36, which is a portion of the meandering path 36 that descends straight from the inlet 38 of the heating chamber 32 directly below, that is, on both sides of the meandering path 36 directly below the inlet 38, so as to sandwich the sheet W from the vicinity of both sides. Similarly, heating plates 55 of a plate-like heating element are disposed on both sides of the meandering path 36 immediately below the outlet 39 so as to sandwich the sheet W from the vicinity of both sides. The heating plate 55 is a plate-like heating element similar to the 1 st heating plate 21 to the 5 th heating plate 25.

As shown in fig. 7, these heating plates 55 are provided at positions immediately below both the inlet 38 and the outlet 39, but may be provided at positions immediately below either the inlet 38 or the outlet 39, and may be heated by heating gas alone without providing the heating plates 55 at all, and may be selected according to the type of the sheet W.

Further, the guide rollers 41 to 43, 46, 47 are provided at upper and lower positions in the meandering passage 36, but a floating blow-out pipe may be provided instead of these guide rollers 41 to 43, 46, 47. In this case, the heating air may be supplied from the heating blower 37 to the floating blow-out pipe.

Further, holes for gas ejection can be also provided in the upper partition wall 48 of the guide rollers 46 and 47 and the lower partition wall 48 of the guide rollers 41 to 43, and the heating gas can be supplied from the outside heating gas supply unit 49 into the meandering passage 36, thereby further improving the heating and drying efficiency.

Next, the operation of the heating and drying apparatus having the above-described configuration will be described. The sheet W is wound on a winding-out machine not shown. Before the heat drying process starts, the sheet is drawn out from the roll-out machine, and as shown in fig. 7, an inlet 38 of the self-heating drying apparatus is inserted into the heating chamber 32, and the sheet W is placed through the meandering path 36 in the heating chamber 32. The leading end of the sheet W led out from the outlet 39 of the side wall of the housing 31 is connected to a winding machine, not shown.

In the heating and drying apparatus, the heating blower 37 is started to supply the heating gas to the heating gas supply unit 49 through the supply pipes 56 and 57. The heating gas introduced into the heating gas supply section 49 passes through a plurality of holes of the perforated plate 58 provided on both sides of the straight portion of the meandering passage 36, and is discharged into the meandering passage 36, whereby the temperature in the heating chamber 32 is raised to a temperature suitable for heating and drying. In this state, the winder operates, the sheet W is wound by the winder, and enters the meandering path 36 in the heating chamber 32 from the inlet 38. The winding speed of the winding machine is adjusted so that the speed at which the sheet W moves in the meandering path 36 becomes an optimal speed according to the type of the sheet.

The continuous sheet W introduced into the meandering passage 36 of the heating chamber 32 moves in the meandering passage 36 by being meandering by the return guide 40 provided at the upper position and the lower position and the linear passage connected thereto. During this time, the sheet W is efficiently heated and dried by blowing the heating gas to both sides of the sheet W through the holes of the perforated plates 58 provided opposite and closely on both sides thereof at the straight portions of the sheet W. For example, in the case of drying the printed surface, the coated surface, or the like of the sheet W, the sheet is dried while being meandering in the heating chamber 32, whereas in the case of performing the annealing treatment of the synthetic resin sheet, the sheet is heated to a predetermined temperature while being meandering, and is annealed.

The sheet W is heated and dried by receiving radiant energy (e.g., heat rays such as near infrared rays and far infrared rays) from a heating plate 55 disposed at a position immediately below the inlet 38 and immediately below the outlet 39. Since the energy can be finely adjusted and controlled by the heat drying by the radiation energy from the heating plate 55, the drying and annealing treatment of the sheet W can be performed optimally according to the material and surface state of the surface of the sheet.

In the heating and drying apparatus according to the embodiment of fig. 7, a heating plate may be provided on the passage side of the partition wall 48 at the folding guide portion 40 of the meandering passage 36, and the sheet may be heated at the folding guide portion 40. Accordingly, the sheet passing through the meandering passage 36 is efficiently heat-treated by the radiant energy of the heating plate 55, the heating air of the heating gas supply portion 49, and the radiant energy of the heating plate from the return guide portion 40.

Description of the reference numerals

1. A housing; 2. a heating chamber; 3. a sidewall; 4. a front door; 6. a tortuous path; 7. a blower; 8. an inlet; 9. an outlet; 10. a folding guide portion; 11. a floating blow-out pipe; 12. a floating blow-out pipe; 13. a floating blow-out pipe; 14. a guide roller; 16. a guide roller; 17. a guide roller; 20. a plate-shaped heating element; 21. a 1 st heating plate; 22. a 2 nd heating plate; 23. a 3 rd heating plate; 24. a 4 th heating plate; 25. a 5 th heating plate; 31. a housing; 32. a heating chamber; 36. a tortuous path; 37. heating the blower; 38. an inlet; 39. an outlet; 40. a folding guide portion; 41. a guide roller; 44. a guide roller; 45. a guide roller; 46. a guide roller; 48. a partition wall; 49. a heating gas supply unit; 55. a heating plate; 56. a supply pipe; 57. a supply pipe; 58. a perforated plate.

Claims (8)

1. A heating and drying device for a sheet-like object is provided with: a heating chamber provided in the housing; and a plurality of folding guides provided at upper and lower positions in the heating chamber, through which a continuous sheet introduced into the heating chamber passes in a meandering state, and which perform heat drying of the sheet,

a meandering path through which the sheet passes in a meandering manner is provided in the heating chamber, and a plurality of plate-shaped heating elements are provided in opposition and in proximity to each other on both sides of the meandering path in which the sheet moves in a meandering manner between the return guide portions in the upper position and the lower position.

2. The apparatus for heat-drying a sheet according to claim 1, wherein,

the meandering passage is arranged inside and is provided with the folding guide portion, and the plurality of plate-shaped heating elements are arranged in parallel with each other with a space therebetween in the heating chamber, and the heating chamber is partitioned by the plate-shaped heating elements to form the meandering passage.

3. A heating and drying apparatus for a sheet according to claim 2, wherein,

the folding guide portion is provided with a heating plate.

4. A heating and drying device for a sheet-like object is provided with: a heating chamber provided in the housing; and a plurality of folding guides provided at upper and lower positions in the heating chamber, through which a continuous sheet introduced into the heating chamber passes in a meandering state, and which perform heat drying of the sheet,

a meandering passage through which the sheet material passes in a meandering manner is provided in the heating chamber, the meandering passage is formed by partitioning the heating chamber by a partition wall, a heating gas supply portion is provided in the heating chamber outside the partition wall, perforated plates are provided in the partition wall on both sides of a straight portion of the meandering passage, and heating gas of the heating gas supply portion is blown into the meandering passage through the perforated plates.

5. The apparatus for heat-drying a sheet according to claim 1 or 4, wherein,

the return guide portion is provided with a floating blow-out pipe for returning the sheet in a noncontact manner, and a plurality of blow-out holes are provided in an outer peripheral curved surface of the floating blow-out pipe.

6. The apparatus for heat-drying a sheet according to claim 1 or 4, wherein,

the folding guide portion is provided with a guide roller for conveying the sheet in a folding manner.

7. The apparatus for heat-drying a sheet according to claim 5, wherein,

the floating blow-out pipe is provided at the lower position with a return guide portion provided with a guide roller for returning the sheet.

8. The apparatus for heat-drying a sheet according to claim 4, wherein,

a plate-like heating element is provided near the inlet or the outlet of the heating chamber at positions near both sides of the sheet moving in the meandering path.