WO2021117525A1

WO2021117525A1 - Drying device

Info

Publication number: WO2021117525A1
Application number: PCT/JP2020/044412
Authority: WO
Inventors: 中村　秀幸
Original assignee: 株式会社瑞光
Priority date: 2019-12-09
Filing date: 2020-11-30
Publication date: 2021-06-17

Abstract

Provided is a drying device capable of rapidly drying ink printed on a base material (sheet, etc.) regardless of the speed at which the base material is conveyed. A drying device (3), that continuously conveys a sheet (S) while sequentially heating and drying, comprises: a conveyance unit (4) which conveys the sheet (S) along a prescribed conveyance path and is configured such that the speed at which the sheet (S) is conveyed can be changed; a heater (5), which is disposed at a position facing the sheet (S) that is in the conveyance path, and which heats the sheet (S) by using radiant heat; and a heat-receiving control unit which controls the amount of heat, per unit of time, the sheet (S) that is in the conveyance path receives from the heater (5), such that the amount of heat increases when the speed at which the sheet (S) is conveyed has increased, and the amount of heat decreases when the speed at which the sheet (S) is conveyed has decreased.

Description

Drying device

The present invention relates to a drying device that dries ink printed on a sheet-shaped substrate.

An example of the above-mentioned drying apparatus is a drying apparatus incorporated on a diaper production line (see Patent Document 1 below).

The production line described in Patent Document 1 includes a transport mechanism, a printing section, a drying section, and a sheet member joining section. The drying unit has a drying chamber, a transport belt, a plurality of air outlets, and a pressure chamber. The drying section dries the ink by blowing dry air onto the sheet on which the image is printed.

In a series of production lines for products such as disposable diapers, the sheet transfer speed is adjusted (that is, the transfer speed is increased or decreased) according to the operating conditions.

Here, in the drying portion shown in Patent Document 1, the drying air blown toward the sheet is dehumidified and heated to a predetermined temperature (for example, about 80 ° C.), so that when the sheet transport speed is slow, , The heating time of the sheet becomes long and the sheet is heated too much, which may cause deterioration or damage of the sheet. On the other hand, when the sheet transport speed is high, the heating time of the sheet is shortened, resulting in insufficient heating, which may cause poor ink drying.

Japanese Patent No. 5799191

An object of the present invention is to provide a drying device capable of quickly drying ink printed on a base material regardless of the transport speed of the base material (sheet or the like).

In order to solve the above problems, the drying device of the present invention is a drying device that continuously heats and dries a sheet-shaped base material while continuously transporting the base material along a predetermined transport path. A transport unit having a configuration capable of changing the transport speed of the base material, and a transport unit that is arranged at a position facing the base material in the transport path, and the base material is subjected to radiant heat. The amount of heat per unit time that the heater to be heated and the base material in the transfer path receive from the heater is increased when the transfer speed of the base material is increased, and the transfer speed of the base material is increased. It is characterized in that it is provided with a heat receiving control unit that controls so that the amount of heat is reduced when the amount of heat is reduced.

It is a front view which shows the whole structure of the printing system including the drying apparatus which concerns on embodiment of this invention. It is a front view which shows the structure of the drying apparatus of FIG. FIG. 2 is a cross-sectional view taken along the line III-III of FIG. It is a front view which shows the specific structure of the shutter of FIG. It is a right side view which shows the specific structure of the shutter of FIG. It is explanatory drawing which shows the movement of the shutter in the drying apparatus of FIG. 2, and is explanatory drawing which shows the state which the shutter is completely closed. It is explanatory drawing which shows the movement of the shutter in the drying apparatus of FIG. 2, and is explanatory drawing which shows the state which opened the shutter by the exposure range A1 according to the transport speed of the sheet which is a base material. It is explanatory drawing which shows the movement of the shutter in the drying apparatus of FIG. 2, and is explanatory drawing which shows the state which opened the shutter in the exposure range A2 which is wider than the exposure range A1 in accordance with the transport speed of the thermoplastic sheet. It is a perspective view which shows the cooling pipe which ejects cooling air as an example of the cooling part which cools a shutter as a modification of this invention. It is a right side view of the drying apparatus provided with the cooling pipe of FIG. 9 is a front view of the cooling pipe, the shutter, and the shutter support portion of FIG. As another modification of the present invention, it is a front view which shows the structure of the drying apparatus which the control part provided with the heater output control part.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows the overall configuration of the printing system 1 incorporated on the disposable diaper production line.

The printing system 1 shown in FIG. 1 includes a printing device 2 and a drying device 3.

The printing apparatus 2 has a plurality of ink injection units 2a for performing inkjet printing on a sheet S (base material) such as a non-woven fabric, and inks such as water-soluble ink are applied from the ink injection units 2a toward the upper surface of the sheet S. Ink.

The drying device 3 is located on the downstream side of the printing device 2 and dries the ink printed on the sheet S.

As shown in FIGS. 1 to 8, the drying device 3 has a configuration in which the sheet S is continuously conveyed and sequentially heated to dry the ink printed on the sheet S. Specifically, the drying device 3 includes a transport unit 4, a heater 5, a heat receiving control unit 6, and a reflector 7 (see FIG. 1).

The transport unit 4 passes the strip-shaped sheet S from the upstream side of the printing device 2 to the downstream side of the drying device 3 via the heating section C (for example, the linear heating section C shown in FIG. 1) which is a predetermined transport path. The transport unit 4 transports the sheet S to the side, and the transport speed of the sheet S can be adjusted according to various conditions such as operating conditions in product manufacturing (number of products manufactured per unit time, temperature and humidity in the manufacturing line, etc.). It has a similar structure.

Specifically, the transport unit 4 includes

drive rolls

4a and 4b, a motor 4c that rotationally drives the drive rolls 4a, and driven

rolls

4d, 4e, 4f, 4g, and 4h that guide the seat S (FIG. 1). reference).

The drive roll 4a is arranged on the upstream side of the heater 5, and the drive roll 4b is arranged on the upstream side of the printing apparatus 2. As the

drive rolls

4a and 4b rotate, the seat S is conveyed at a constant speed in the sections of the

drive rolls

4a and 4b.

The sheet S passes through the drive roll 4b, the driven roll 4h, the printing device 2, the driven roll 4g, the driven roll 4f, the heating section C, the driven roll 4e, the heating section C, the driven roll 4f, the driving roll 4a, and the driven roll 4d in this order. And be transported.

That is, the sheet S has a heating section C (outward heating section C1) from the upstream end to the downstream end of the heater 5 (from the driven roll 4f to the driven roll 4e) and the upstream side from the downstream end of the heater 5. Since it is conveyed along the heating section C (return heating section C2) toward the end (driven roll 4e to driven roll 4f), it makes at least one reciprocation within the heating section C (turning point: driven roll 4e).

The motor 4c is a motor (for example, a servo motor) capable of adjusting the rotation speed of the drive roll 4a.

The drive roll 4b is connected to a motor (not shown), and the rotation speed can be adjusted according to the rotation speed of the drive roll 4a.

Thereby, it is possible to change (increase / decrease) the transport speed of the seat S by changing the rotation speed of the motor 4c.

The heater 5 is arranged at a position facing the sheet S in the outward heating section C1 and heats the sheet S by radiant heat. The heater 5 has a plurality of radiant heat generating portions 5a extending along the heating section C and a cover 5b (see FIG. 3).

The radiant heat generating unit 5a has a configuration in which radiant heat (specifically, infrared rays) is generated by receiving a current supplied from a power source (not shown), and is, for example, a halogen heater.

As shown in FIG. 3, the cover 5b has an inverted U-shape in the transport direction of the sheet S. Specifically, the cover 5b is composed of a pair of side surface portions and an upper surface portion for accommodating the radiant heat generating portion 5a inside the cover 5b, and is a sheet on the lower side of the cover 5b, that is, in the outward heating section C1. The side facing S (lower surface side) is open.

As a result, the radiant heat generated from the radiant heat generating unit 5a is released toward the sheet S. As shown in FIG. 2 and the like, at least one of the pair of side surface portions and the upper surface portion of the cover 5b has a plurality of openings (oval shape in the present embodiment) for preventing overheating in the cover 5b. It is provided. Further, the shape of the cover 5b is not limited to the above-mentioned inverted U shape, and may have, for example, a box shape further including a front portion and a back portion in the transport direction view of the seat S.

The reflector 7 is arranged at a position facing the open surface (lower surface) of the cover 5b with the sheet S in the heating section C interposed therebetween.

The upper surface of the reflector 7 (the surface facing the sheet S in the return heating section C2) is emitted from the heater 5 and reflects the radiant heat (infrared rays) transmitted through the sheet S toward the sheet S on the return heating section C2 side. Manufactured from materials that can be used, or mirror-treated.

The heat receiving control unit 6 has a configuration for controlling the amount of heat emitted from the heater 5 toward the sheet S in the heating section C per unit time. For example, when the transport speed of the sheet S increases, the heat receiving control unit 6 has a structure. When the amount of heat is increased and the transfer speed of the sheet S is reduced, the amount of heat is controlled to be reduced.

Specifically, the heat receiving control unit 6 of the present embodiment includes a shutter 11, a shutter drive unit 12, a drive control unit 13, and a shutter support unit 14, as shown in FIG.

The shutter 11 has a configuration in which the exposure range of the heater 5 with respect to the seat S can be changed and adjusted.

Specifically, as shown in FIG. 6 and the like, the shutter 11 of the present embodiment has a length equal to or longer than the total length of the heating section C so as to cover the entire length of the heating section C, and at least the cover 5b. It has a length extending from one side surface to the other side surface (see FIGS. 3 and 5). Further, the shutter 11 is configured to move linearly (translate) along the heating section C (see FIG. 6).

In the shutter 11 having the above configuration, when expanding the exposure range of the heater 5, the shutter 11 is moved from the downstream side to the upstream side of the outward heating section C1 (moves in the direction of the arrow X1 in FIGS. 7 and 8). When narrowing the exposure range of the heater 5, the shutter 11 is moved from the upstream side to the downstream side of the outward heating section C1 (moves in the direction of the arrow X2 in FIGS. 7 and 8). The size of the exposure range of the heater 5 is indicated by the exposure ranges A1 and A2 in the direction of the heating section C (see FIGS. 7 and 8).

Further, as shown in FIGS. 2 to 5, the shutter 11 has a plurality of shielding plates 11a, a chain connecting portion 11b, and a guide protrusion 11c.

The shielding plate 11a is made of a heat-resistant material, for example, a plate-shaped member such as metal or ceramics, and has a length extending from at least one side surface portion of the cover 5b to the other side surface portion (FIGS. 3 and 5). reference).

The chain connecting portion 11b is provided on one side edge of the upper surface of each shielding plate 11a (the surface facing the heater 5 in the heating section C), and is connected to the chain 12f described later (see FIGS. 3 and 5). ).

The guide protrusion 11c is provided on one side edge of the lower surface of each shielding plate 11a (the surface facing the sheet S in the heating section C), and projects downward from the lower surface of the shielding plate 11a. Specifically, the guide protrusion 11c is arranged at a position directly below the chain connecting portion 11b with the shielding plate 11a interposed therebetween.

Here, the shutter support portion 14 is composed of a guide member 14a and a pair of

guide rails

14b and 14c.

The guide member 14a extends along the heating section C and protrudes from the angle member 14a1 having a substantially L-shaped shape in the transport direction of the sheet S and the flat surface portion of the angle member 14a1 facing the lower surface of the shielding plate 11a. It is composed of a columnar body 14a2 extending along the heating section C.

The pair of

guide rails

14b and 14c are formed of columnar bodies that extend along the heating section C and have a rectangular shape in the transport direction of the sheet S. The pair of

guide rails

14b and 14c are provided at positions facing the lower surface of the shielding plate 11a, and have a predetermined gap between the guide rails 14b and the guide rails 14c in the transport direction view of the sheet S. Have been placed.

Therefore, when each of the shielding plates 11a (shutter 11) moves along the heating section C, the edge portion of the shielding plate 11a facing the guide member 14a slides on the columnar body 14a2 of the guide member 14a. , The edge of the shielding plate 11a facing the pair of

guide rails

14b, 14c is guided in the direction along the heating section C via the guide protrusion 11c sandwiched between the pair of

guide rails

14b, 14c. ..

As shown in FIGS. 2 to 3, the shutter drive unit 12 has a direction in which the exposure range is widened (direction of arrow X1 in FIGS. 7 and 8) and a direction in which the exposure range is narrowed (direction of arrow X2 in FIGS. 7 and 8). It has a configuration in which the shutter 11 is moved.

In the present embodiment, the shutter drive unit 12 includes a drive sprocket 12a, a drive motor 12b, three driven sprockets 12c to 12e, and an endless chain 12f (endless carrier). Further, the drive sprocket 12a, the drive motor 12b, and the three driven sprockets 12c to 12e are attached to a mounting plate 12g provided parallel to the pair of side surface portions of the cover 5b (standing vertically). ..

The driven sprocket 12d is provided near the upstream end of the heater 5 (see FIG. 2), and is arranged at a position facing the guide protrusion 11c with the shielding plate 11a in the transport direction of the sheet S (see FIG. 2). (See FIG. 3).

The driven sprocket 12e is arranged at the same position as the driven sprocket 12d in the transport direction of the sheet S (see FIG. 2), and is from the shielding plate 11a rather than the driven sprocket 12d in the direction perpendicular to the upper surface of the shielding plate 11a. They are located at distant positions (see FIG. 3).

The driven sprocket 12c is provided near the downstream end of the heater 5 (see FIG. 2), and is arranged at a position overlapping the driven sprocket 12d in the transport direction view of the sheet S (see FIG. 3).

The drive sprocket 12a is arranged at the same position as the driven sprocket 12c in the conveying direction of the seat S (see FIG. 2), and is arranged at a position overlapping the driven sprocket 12e in the conveying direction of the seat S (FIG. 3). reference).

That is, the drive sprocket 12a and the three driven sprockets 12c to 12e are arranged so as to form a rectangle extending parallel to the heating section C as shown in FIG.

The chain 12f is hung around the driving sprockets 12a and the three driven sprockets 12c to 12e. Further, as shown in FIGS. 2 to 5, the chain 12f is individually connected to the shielding plate 11a via the chain connecting portion 11b on the upper surface of each of the plurality of shielding plates 11a. As a result, the shutter 11 having the plurality of shielding plates 11a can move along the chain 12f as shown in FIGS. 6 to 8.

With the above configuration, at the position where the shutter 11 is slightly opened (position in FIG. 7), a part of the shutter 11 (the part heated by the heater 5 in the vicinity of the driven sprocket 12d) is above the heater 5 (the driven sprocket 12e). Since the heat is retracted in the direction away from the side), it is possible to suppress the heat stored in the retracted shutter 11 from affecting the sheet S.

Further, at the position where the shutter 11 is widely opened (the position shown in FIG. 8), a part of the retracted portion of the shutter 11 extends to the downstream side of the heater 5 via the driven sprocket 12e, so that the upper surface portion of the cover 5b An open space is formed between the heater 5 and the shutter 11 extending to the downstream side of the heater 5, and the heat generated from the heater 5 is less likely to be trapped around the heater 5.

The drive control unit 13 is configured to control the shutter drive unit 12 so that the exposure range increases when the transfer speed of the seat S increases and the exposure range decreases when the transfer speed decreases. ing.

Specifically, the drive control unit 13 includes a rotation speed sensor 13a and a motor control unit 13b, as shown in FIG. The rotation speed sensor 13a detects the rotation speed of the motor 4c that rotationally drives the drive roll 4a of the transfer unit 4 as a speed detection unit that detects the transfer speed of the sheet S. The motor control unit 13b increases the exposure range of the drive motor 12b of the shutter drive unit 12 of the heat receiving control unit 6 when the transfer speed of the sheet S increases in response to the detected increase / decrease in the rotation speed of the motor 4c. Moreover, when the transport speed is reduced, the drive is controlled so as to rotate in the direction in which the exposure range is reduced.

(Characteristics of Embodiment)
(1)
In the drying device 3 of the present embodiment, as shown in FIG. 1, the drying device 3 includes a heat receiving control unit 6. The heat receiving control unit 6 increases the amount of heat per unit time that the sheet S in the heating section C receives from the heater 5 when the transfer speed of the sheet S increases, and reduces the transfer speed of the sheet S. When this is done, the amount of heat is controlled to be reduced.

As a result, when the transport speed of the sheet S is slow, for example, as shown in FIG. 7, the opening of the shutter 11 is suppressed to reduce the exposure range A1 through the opening 17, so that the sheet S becomes a heater. It is possible to suppress the amount of heat received from No. 5, and there is no risk of deterioration or damage of the sheet S due to overheating of the sheet S (that is, an increase in the total amount of heat received).

On the other hand, when the transport speed of the sheet S is high, for example, as shown in FIG. 8, the opening of the shutter 11 is widened to increase the exposure range A2 through the opening 17, so that the sheet S can be moved from the heater 5. It is possible to increase the amount of heat received.

As a result, the sheet S is sufficiently heated even for a short time (providing a sufficient total amount of heat received to the sheet S), and the sheet S is appropriately heated and dried (that is, the base material is heated and the ink printed on the base material is used. It is possible to dry), and it is possible to prevent product defects due to insufficient heating of the sheet S.

As a result, the ink printed on the sheet S can be quickly dried regardless of the transport speed of the sheet S. Further, it is possible to prevent deterioration and damage due to overheating of the sheet S and prevent product defects due to insufficient heating.

(2)
In the drying device 3 of the present embodiment, the heat receiving control unit 6 has a shutter 11 capable of changing the exposure range for exposing the heater 5 to the sheet S through the opening 17, and a shutter in the direction in which the exposure range increases and decreases. A shutter drive unit 12 for moving 11 along the heating section C and a drive control unit 13 are provided.

The drive control unit 13 controls the shutter drive unit 12 so that the exposure range increases when the transport speed increases and the exposure range decreases when the transport speed decreases. As a result, the amount of heat per unit time that the sheet S in the heating section C receives from the heater 5 is increased when the transfer rate of the sheet S increases, and when the transfer rate of the sheet S decreases. It is possible to control so as to reduce the amount of heat.

Further, in this configuration, the amount of heat received by the sheet S from the heater 5 is increased or decreased by changing the exposure range through the opening 17 that exposes the heater 5 by moving the shutter 11, so that the change in the transport speed of the sheet S is followed. It is possible to increase or decrease the amount of heat with good responsiveness. As a result, it is possible to reliably achieve the rapid drying of the ink printed on the sheet S regardless of the transport speed of the sheet S. Further, it is possible to surely achieve both prevention of deterioration and damage due to overheating of the sheet S and prevention of product defects due to insufficient heating.

Moreover, in this configuration, the exposure range can be increased or decreased by moving the shutter 11 along the heating section C, so that the configuration of the shutter 11 and the heat receiving control unit 6 including the shutter 11 can be simplified and the heat receiving control can be performed. The malfunction of the part 6 is reduced.

(3)
In the drying device 3 of the present embodiment, the shutter drive unit 12 is connected to the shutter 11, and has an endless chain 12f (endless carrier) that is connected to the shutter 11 and can circulate on a circular path that partially faces the heating section C, and a chain 12f. (Specifically, a drive sprocket 12a, a drive motor 12b, and a driven sprocket 12c) are provided.

In this configuration, with the shutter 11 connected to the chain 12f, the shutter 11 and the chain 12f are orbitally moved by the orbiting moving portion, thereby simplifying and miniaturizing the mechanism for moving the shutter 11 along the heating section C. It is possible. Moreover, the shutter 11 can be easily moved in the direction of increasing or decreasing the exposure range by utilizing the rotational driving force of the drive motor 12b.

In the above embodiment, the chain 12f is shown as an example of the endless carrier, but the present invention is not limited to this, and an endless belt or the like may be used.

(4)
In the drying device 3 of the present embodiment, the shutter 11 has a plurality of shielding plates 11a. The chain 12f is individually connected to a plurality of shielding plates 11a. In this configuration, the shutter 11 and the chain 12f can be smoothly orbited. Moreover, in this configuration, the length of the shutter 11 can be easily changed by increasing or decreasing the number of the shielding plates 11a, and the degree of freedom in design is high.

(5)
The drying device 3 of the present embodiment includes a reflector 7 arranged at a position facing the heater 5 with the heating section C interposed therebetween. Therefore, the radiant heat emitted from the heater 5 and passing through the heating section C can be reflected by the reflector 7 toward the heating section C and used for heating and drying the sheet S. This makes it possible to heat-dry the sheet S in an energy-efficient manner.

(6)
In the drying device 3 of the present embodiment, the transport unit 4 has a configuration for transporting the sheet S so as to reciprocate at least once along the heating section C. Therefore, the sheet S can be reciprocated at least once along the heating section C to be conveyed, whereby the time for the sheet S to be heated by the heater 5 can be increased and the sheet S can be efficiently heated and dried. is there.

(Modification example)
(A)
As a modification of the drying device 3 of the present invention, as shown in FIGS. 9 to 11, a cooling unit 15 for cooling the shutter 11 may be further provided.

The cooling unit 15 shown in FIGS. 9 to 11 has a configuration in which a cooling gas is blown toward the shutter 11. Specifically, the cooling unit 15 is composed of a cylindrical pipe arranged along the heating section C so as to be located above the shutter 11 supported from below by the shutter support unit 14. Depending on the length of the heating section C, one or a plurality of cooling units 15 can be installed.

The pipe constituting the cooling unit 15 has a slit 15a that opens diagonally downward toward the shutter 11. During the operation of the drying device 3, the cooling unit 15 injects, for example, air into the shutter 11 as a cooling gas from the slit 15a. The cooling gas may be at room temperature (room temperature at the place where the drying device 3 is installed), or may be cooled if necessary.

In the modified example shown in FIGS. 9 to 11, the drying device 3 includes a cooling unit 15 for cooling the shutter 11. Therefore, even if heat is received from the heater 5 in the portion of the shutter 11 that shields between the heating section C and the heater 5, the shutter 11 is cooled by the cooling unit, so that the shutter 11 is deteriorated or damaged by the heat. It is possible to prevent it.

Further, the cooling unit 15 shown in FIGS. 9 to 11 has a configuration (a configuration having a slit 15a) of blowing a cooling gas toward the shutter 11. Therefore, the cooling unit 15 can cool the shutter 11 by blowing the cooling gas toward the shutter 11, and the unnecessary gas generated during the heating and drying of the sheet S is smoothly discharged to the outside of the heating section C. It is possible to do.

(B)
In the above embodiment, as the shutter 11 capable of changing the exposure range through the opening 17 that exposes the heater 5 to the sheet S, a series of shutters 11 in which a plurality of shielding plates 11a are continuous along the heating section C are used. However, the present invention is not limited to the configuration of the shutter 11. The shutter of the present invention may have a configuration in which the exposure range for exposing the heater 5 to the sheet S can be changed, for example, a configuration in which a plurality of shielding plates can be opened and closed individually, or an exposure such as a camera diaphragm. The configuration may be such that the range can be changed steplessly.

(C)
In the drying device 3 of the above embodiment, the heat receiving amount of the sheet S is adjusted by adjusting the opening degree of the shutter 11 in accordance with the transport speed of the sheet S as the heat receiving and drying unit. It is not limited to this.

The heat receiving control unit 6 of the present invention increases the amount of heat per unit time that the sheet S in the heating section C receives from the heater 5 when the transfer speed of the sheet S increases, and transfers the sheet S. The configuration may be such that the amount of heat is controlled to be reduced when the speed is reduced. For example, the heat receiving control unit 6 may have a configuration capable of adjusting the heat receiving amount of the sheet S by adjusting the output of the heater 5 according to the transport speed of the sheet S.

That is, in the drying device 3, which is still another modification of the present invention, as shown in FIG. 12, the calorific value of the heater 5 per unit time increases when the transport speed of the sheet S increases, and the heat generation amount per unit time increases. A heater output control unit 16 that controls the output of the heater 5 is provided so that the amount of heat generated is reduced when the transport speed is reduced.

Specifically, the heater output control unit 16 has a rotation speed sensor 16a and a control unit main body 16b, as shown in FIG. Similar to the above-mentioned rotation speed sensor 13a, the rotation speed sensor 16a detects the rotation speed of the motor 4c that rotationally drives the drive roll 4a of the transfer unit 4 as a speed detection unit that detects the transfer speed of the sheet S. The control unit main body 16b increases the amount of heat generated per unit time of the heater 5 and decreases the transfer speed when the transfer speed of the sheet S increases in response to the detected increase / decrease in the rotation speed of the motor 4c. The output of the heater 5 is controlled so that the amount of heat generated is reduced when the heat is generated.

In the modified example shown in FIG. 12, the heat receiving control unit 6 includes a heater output control unit 16. The heater output control unit 16 outputs the output of the heater 5 so that the calorific value per unit time of the heater 5 increases when the transport speed increases and the calorific value decreases when the transport speed decreases. Control. In this configuration, since the output of the heater 5 is controlled in conjunction with the change in the transport speed of the seat S, the heat receiving amount of the seat S is increased or decreased by the movement of the shutter 11 as in the above embodiment. The heat receiving control unit 6 does not have a moving portion, and the configuration is simple. Therefore, although it has a simple structure, the ink printed on the sheet S can be quickly dried regardless of the transport speed of the sheet S. Further, it is possible to prevent deterioration and damage due to overheating of the sheet S and prevent product defects due to insufficient heating.

<Summary of Embodiment>
The embodiments are summarized below.
The drying device according to the embodiment is a drying device that sequentially heats and dries a sheet-shaped base material while continuously transporting the base material, and is a transport unit that transports the base material along a predetermined transport path. A transport unit having a configuration capable of changing the transport speed of the base material, a heater arranged at a position facing the base material in the transport path and heating the base material by radiant heat, and the transport The amount of heat per unit time that the base material in the path receives from the heater is increased when the transfer speed of the base material is increased, and the amount of heat is increased when the transfer speed of the base material is reduced. It is characterized in that it is provided with a heat receiving control unit that controls so as to reduce the amount of heat.

In such a configuration, the drying device includes a heat receiving control unit, and the heat receiving control unit increases the heat amount per unit time that the base material in the transport path receives from the heater, and the transport speed of the base material increases. When this is done, the amount of heat is increased, and when the transfer speed of the base material is reduced, the amount of heat is controlled to be reduced. As a result, when the transfer speed of the base material is slow, the amount of heat received by the base material from the heater can be suppressed, and the base material is overheated (that is, the total amount of heat received by the base material is increased). There is no risk of deterioration or damage.

On the other hand, when the transfer speed of the base material is high, the amount of heat received by the base material from the heater can be increased, and sufficient heating is performed even for a short time (providing a sufficient total amount of heat received to the base material). It is possible to appropriately heat and dry the base material, and it is possible to prevent product defects due to insufficient heating of the base material.

As a result, the ink printed on the base material can be quickly dried regardless of the transport speed of the base material (sheet, etc.).

In the drying device, the heat receiving control unit includes a shutter capable of changing the exposure range for exposing the heater to the substrate between the transport path and the heater, and a shutter in which the exposure range increases and decreases. A shutter drive unit that moves the shutter in the direction along the transport path, and an exposure range that increases when the transport speed increases and decreases when the transport speed decreases. It is preferable that the shutter drive unit is provided with a drive control unit for controlling the shutter drive unit.

According to this configuration, the heat receiving control unit includes a shutter that can change the exposure range for exposing the heater to the substrate, a shutter drive unit, and a drive control unit. The drive control unit controls the shutter drive unit so that the exposure range increases when the transfer speed increases and the exposure range decreases when the transfer speed decreases. As a result, the amount of heat per unit time received by the base material in the transfer path from the heater is increased when the transfer speed of the base material is increased, and the amount of heat is increased when the transfer speed of the base material is reduced. Can be controlled to reduce.

That is, in this configuration, the amount of heat received by the base material from the heater is increased or decreased by changing the exposure range in which the heater is exposed by moving the shutter. Can be increased or decreased. As a result, it is possible to reliably achieve the rapid drying of the ink printed on the base material regardless of the transport speed of the base material (sheet or the like).

Moreover, since the exposure range can be increased or decreased by moving the shutter along the transport path, the configuration of the shutter and the heat receiving control unit including the shutter can be simplified and the malfunction of the heat receiving control unit can be reduced.

In the above-mentioned drying apparatus, the shutter driving unit is connected to the shutter and can orbit in an orbital path that partially opposes the conveying path, and an endless conveying body that orbits the endless conveying body. It is preferable to have a moving portion.

According to such a configuration, the mechanism for moving the shutter along the transport path is simplified and miniaturized by orbiting the shutter and the endless carrier with the orbiting moving unit in the state where the shutter is connected to the endless carrier. It is possible. Moreover, it is possible to easily move the shutter in the direction of increasing or decreasing the exposure range by using the rotational driving force of the motor or the like.

In the above-mentioned drying apparatus, it is preferable that the shutter has a plurality of shielding plates, and the endless carrier is individually connected to the plurality of shielding plates.

According to this configuration, the shutter has a plurality of shielding plates. By connecting each of the plurality of shielding plates to the endless carrier, the shutter and the endless carrier can be smoothly orbited. Moreover, in this configuration, the length of the shutter can be easily changed by increasing or decreasing the number of shielding plates, and the degree of freedom in design is high.

It is preferable that the drying device further includes a cooling unit for cooling the shutter.

According to this configuration, heat is received from the heater in the portion of the shutter that blocks the space between the transport path and the heater, but by cooling the shutter with the cooling unit, deterioration or damage due to the heat of the shutter can be prevented. It is possible.

In the above drying device, it is preferable that the cooling unit has a configuration in which a cooling gas is blown toward the shutter.

According to this configuration, the cooling unit can cool the shutter by blowing the cooling gas toward the shutter, and unnecessary gas generated during heating and drying of the base material is smoothly discharged to the outside of the transport path. It is possible to do.

In the above drying device, the heat receiving control unit increases the calorific value per unit time of the heater when the transport speed increases, and reduces the calorific value when the transport speed decreases. May be provided with a heater output control unit that controls the output of the heater.

According to this configuration, the heat receiving control unit includes a heater output control unit. The heater output control unit outputs the heater so that the calorific value per unit time of the heater increases when the transport speed increases and the calorific value decreases when the transport speed decreases. To control. In this configuration, since the output of the heater is controlled in conjunction with the change in the transfer speed of the base material, the heat receiving control unit has a movable portion as compared with the mechanism for increasing or decreasing the amount of heat received by the base material by moving the shutter. It is easy to configure. Therefore, although it has a simple structure, it is possible to quickly dry the ink printed on the base material regardless of the transport speed of the base material (sheet or the like).

It is preferable that the drying device further includes a reflector arranged at a position facing the heater across the transport path.

According to this configuration, the radiant heat that has passed through the transport path from the heater can be reflected by the reflector toward the transport path and used for heating and drying the base material. This makes it possible to heat-dry the base material in an energy-efficient manner.

In the above drying apparatus, it is preferable that the transport unit has a configuration for transporting the base material so as to reciprocate at least once along the transport path.

According to such a configuration, the base material can be reciprocated at least once along the transport path for transport. This makes it possible to efficiently heat and dry the base material by increasing the time for which the base material is heated by the heater.

As described above, according to the drying apparatus of the above-described embodiment, the ink printed on the base material can be quickly dried regardless of the transport speed of the base material (sheet or the like).

Claims

A drying device that continuously heats and dries a sheet-shaped base material while continuously transporting it.
A transport unit that transports the base material along a predetermined transport route and has a configuration capable of changing the transport speed of the base material, and a transport unit.
A heater arranged at a position facing the base material in the transport path and heating the base material by radiant heat,
The amount of heat per unit time that the base material in the transport path receives from the heater is increased when the transport speed of the base material increases, and when the transport speed of the base material decreases. A drying device including a heat receiving control unit that controls so as to reduce the amount of heat.
The heat receiving control unit
A shutter capable of changing the exposure range for exposing the heater to the base material between the transport path and the heater.
A shutter drive unit that moves the shutter along the transport path in a direction in which the exposure range increases and decreases, and a shutter drive unit.
A drive control unit that controls the shutter drive unit is provided so that the exposure range increases when the transport speed increases and the exposure range decreases when the transport speed decreases.
The drying apparatus according to claim 1.
The shutter drive unit includes an endless carrier that is connected to the shutter and can orbit in a circuit path that partially opposes the transport path.
The drying apparatus according to claim 2, further comprising an orbiting moving portion for orbiting the endless carrier.
The shutter has a plurality of shielding plates and has a plurality of shielding plates.
The endless carrier is individually connected to the plurality of shielding plates.
The drying apparatus according to claim 3.
A cooling unit for cooling the shutter is further provided.
The drying apparatus according to any one of claims 2 to 4.
The cooling unit has a configuration in which a cooling gas is blown toward the shutter.
The drying apparatus according to claim 5.
The heat receiving control unit
Heater output control that controls the output of the heater so that the calorific value per unit time of the heater increases when the transport speed increases and the calorific value decreases when the transport speed decreases. Has a part,
The drying apparatus according to claim 1.
The drying apparatus according to any one of claims 1 to 7, further comprising a reflector arranged at a position facing the heater across the transport path.
The transport unit has a configuration for transporting the base material so as to reciprocate at least once along the transport path.
The drying apparatus according to any one of claims 1 to 8.