JPH04184080A - Heat plate type radiation drying device - Google Patents

Abstract

PURPOSE:To provide an accurate control of a radiation heat temperature by a method wherein a surface temperature of a radiation surface is directly measured with a temperature measuring means disposed at a surface of the radiation heat plate opposing against a sheet-like abe member and a flow rate or pressure adjusting valve disposed in a thermal medium supplying passage is operated through a temperature controller. CONSTITUTION:A temperature measuring means 7 is disposed at a surface of a heat plate so as to measure a surface temperature of a radiation heat plate 2 opposing to a sheet base material (a). As an additional means for the heat plate surface, either a resistor or a thermocouple is fixed with a soldering or a molding means. The temperature measuring means 7 is connected to a temperature controller 6. The temperature controller 6 operates either a flow rate adjusting or a pressure adjusting valve 5 in reference to a deviation from a set temperature in response to the measured temperature measured by the temperature measuring means 7, either the flow rate or pressure of the thermal medium is adjusted so as to control it to a constant temperature. A surface temperature of the radiation heat plate 2 is measured by the temperature measuring means 7 disposed at the surface of the heat plate, either the flow rate adjusting valve or pressure adjusting valve 5 is operated in response to a signal from the temperature controller 6 in view of the measured temperature so as to adjust either the flow rate or pressure of the thermal medium and control the radiation heat plate 2 to be a predetermined temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a hot plate radiation dryer for drying sheet-like substrates such as paper impregnated with a resin solvent in a resin impregnation apparatus. It is something.

[Prior Art] A hot plate type radiation dryer has a drying chamber (11) in which a sheet-like substrate (a) is conveyed in a vertical direction, as shown in FIG. 3, for example.
A radiant heat plate (12) is disposed inside the radiant heat plate (12) so as to face each other with a required interval between them, with the feeding positioning device for the sheet-like base material (a) in the middle. By supplying a heat medium such as medium oil, hot water, steam or combustion gas,
The sheet-like base material (a) fed through the re-radiant heat plates (12) (12) is heated and dried with radiant heat.

By the way, depending on the type and use of the sheet-like base material (a) to be dried, appropriate and strict drying conditions and finishing conditions are required. The temperature of the radiant heat from the plate (12), especially the temperature distribution in the width direction, is required to be appropriate and uniform. In order to satisfy these requirements, temperature control is generally practiced.

Conventionally, as a means for such temperature control, the atmospheric temperature in the drying chamber (II), such as between the radiant heat plates (12) (12), is determined, and the temperature is controlled based on the measured temperature. The temperature is controlled by operating a flow rate or pressure regulating valve (15) using the heat source (1B) to adjust the flow rate or pressure of the heat medium in the supply path (13) from the heat source (14).

In addition, if the heat medium is heat transfer oil or hot water, for example,
As seen in Japanese Patent No. 6-36352, there is also a method of controlling the temperature by measuring the outlet temperature of the heat medium and adjusting the flow rate or pressure of the heat medium based on the measured temperature.

[Problems to be Solved by the Invention] However, as described above, controlling the temperature of the heat medium according to the atmospheric temperature in the drying chamber (11) is not possible using a radiant heat plate (I).
2) In addition to not directly measuring the surface temperature, the temperature in the drying chamber is not uniform due to the movement of air and convection due to the conveyance of the sheet-like substrate (a), and the measured temperature is also likely to change. Therefore, it is difficult to accurately grasp and control the surface temperature of the radiant heat plate, which directly affects the drying temperature, and temperature control tends to be unstable, making it impossible to perform highly accurate drying processing.

In addition, if the outlet temperature of the heat medium is measured and controlled, not only can steam or combustion gas not be used as the heat medium, but the surface temperature of the radiant heat plate cannot be directly measured, which may affect the drying process. The disadvantage is that the radiant heat temperature cannot be accurately controlled.

The present invention has been made in view of the above, and the temperature control of a hot plate type radiant dryer is performed based on the surface temperature of the radiant heat plate, thereby making it possible to accurately control and manage the temperature of the drying process. It is something.

[Means for Solving the Problems] The present invention provides a drying chamber through which a sheet-like base material to be dried is conveyed, and a heat medium is provided inside the drying chamber through which the sheet-like base material to be dried is conveyed. A radiant heat plate that can be supplied is arranged so as to face the conveying position of the sheet-like base material, and a heat medium is supplied inside this radiant heat plate, so that the sheet-like base material is heated and dried by the radiant heat. In order to solve the above problem in the hot plate type radiant dryer, a temperature measuring means for measuring the temperature of the surface is attached to the surface of the radiant heat plate facing opposite to the sheet-like base material, and a temperature measuring means is connected to the temperature measuring means. The temperature controller is used to operate the flow rate or pressure regulating valve provided in the heat medium supply path based on the measured temperature of the radiation plate surface, thereby controlling the flow rate or pressure of the heat medium. shall be.

[Function] According to the present invention, the surface temperature of the radiant surface is directly measured by the temperature measuring means attached to the surface of the radiant heat plate facing the sheet-like base material, and based on this measured temperature, The flow rate or pressure of the heat medium supplied to the radiant heat plate can be adjusted and controlled by operating the flow rate or pressure regulating valve disposed in the heat medium supply path via the temperature controller.

In particular, it is possible to accurately measure the surface temperature of the radiant heat plate without being affected by convection in the drying chamber or movement of air caused by the conveyance of the sheet-like substrate. The temperature of the passage section can be accurately and stably controlled.

[Example] Next, embodiments of the present invention will be described based on the drawings.

1 and 2 schematically show a hot plate type radiation dryer showing an embodiment of the present invention. In the figure, (1) is a drying chamber provided so that the sheet-like base material (a) can be conveyed vertically, and (2) is a drying chamber provided with the sheet-like base material (a) on the inner wall of the drying chamber (1). The radiant heat plates are arranged to face each other with a required interval so as to face each other with the feeding position in a) in the middle.

The radiant heat plate (2) has a hollow panel shape and is connected to a heat source (4) via a heat medium supply path (3), so that a heat medium can be appropriately supplied inside. As the heat medium, in addition to heat medium oil and hot water, steam, combustion gas, etc. can also be used.

(5) is the supply path (3) from the heat source (4) to the radiant heat plate (2).
) is a flow rate or pressure regulating valve installed at the This regulating valve (5) is opened and closed by a signal from a temperature controller (6), so that the flow rate or pressure of the heat medium can be adjusted.

(7) is a temperature measuring means attached to the surface (2a) of the radiant heat plate (2) so as to measure the temperature of the surface of the radiant heat plate (2) facing the sheet-like base material (a). As the temperature measuring means (7), in addition to a resistance temperature detector, a thermocouple or a non-contact thermometer using infrared rays can be used.

As attachment means for (2a), a resistance temperature detector and a thermocouple are attached to the surface of the hot plate by soldering or molding means. In the case of a non-contact thermometer, it is attached by being embedded in glass that is not affected by infrared rays.

The temperature measuring means (7) is connected to a temperature controller (6). The temperature controller (6) operates the flow rate or pressure regulating valve (5) according to the deviation from the set temperature based on the temperature measured by the temperature measuring means (7), and adjusts the flow rate or pressure of the heat medium;
Provided to control the temperature to a constant temperature.

Note that the heat medium discharge pipe (8) from the radiant heat plate (2) is
In the case of a liquid such as heat transfer oil or hot water, it is provided at the top of the radiant heat plate (2), and in the case of steam, it is provided at the bottom.

According to the above-described radiant dryer, the surface temperature of the radiant heat plate (2) is determined by the temperature measuring means (7) attached to the heat plate surface (2a).
and a temperature controller (6) based on this measured temperature.
The flow rate or pressure regulating valve (5) is actuated by the signal from the radiant heat plate (5) to adjust the flow rate or pressure of the heat medium.
2> itself is controlled to a predetermined temperature.

In addition, it is possible to arrange a plurality of radiant heat plates (2) in the vertical direction or to divide them in the width direction, and in this case, a temperature measuring means is arranged for each heat plate as described above. It is also possible to implement it by

[Effects of the Invention] As described above, according to the present invention, in a hot plate type radiant dryer, the temperature of the surface of the hot plate is directly measured by the temperature measuring means attached to the surface of the hot plate, and the temperature is adjusted to the measured temperature. Since the temperature is controlled by adjusting the flow rate or pressure of the heating medium based on the drying temperature, the temperature can be controlled accurately and stably without being affected by air flow or convection caused by the passage of the sheet-like substrate in the drying chamber. The surface temperature of the hot plate and, by extension, the temperature of the substrate passage area can be well controlled and managed, allowing the sheet-like substrate to be properly dried and the finished state to be more stable. In addition, in order to measure the surface temperature of the radiant heat plate itself, the heat medium
The temperature can be precisely controlled whether it is heat transfer oil, hot water, steam or combustion gas. Furthermore, the temperature distribution in the width direction can be easily managed.

[Brief explanation of drawings]

Fig. 1 is a schematic perspective view of a hot plate type radiation dryer showing one embodiment of the present invention, Fig. 2 is a schematic plan view of the same, and Fig. 3 shows temperature control means of a conventional hot plate type radiation dryer. It is a schematic perspective view. (1)...drying room, (2)...radiant heat plate, (3)...
...Heat medium supply path, (4)...Heat source, (5)...
Flow rate or pressure regulating valve, (6)...Temperature controller, (7
)...Temperature measurement means. Patent applicant Hirano Techseed Co., Ltd. Figure 3

Claims (1)

[Claims] 1. In the drying chamber to which the sheet-like base material to be dried is conveyed,
A radiant heat plate capable of supplying a heat medium inside is arranged so as to face the conveying position of the sheet-like base material, and by supplying the heat medium inside this radiant heat plate, the sheet-like base material is heated with the radiant heat. In a hot plate type radiant dryer that performs heating drying, a temperature measuring means for measuring the temperature of the surface is attached to the surface of the radiant heating plate facing opposite to the sheet-like substrate, and a temperature control device connected to this temperature measuring means is attached. A hot plate type radiation drying device characterized in that the flow rate or pressure regulating valve provided in the heat medium supply path is operated by a device based on the measured temperature of the radiation plate surface to control the flow rate or pressure of the heat medium. Machine.