JP2903337B2 - Heating method using infrared rays - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a heating method using infrared rays, and relates to a component (for example, an organic solvent or the like) having an infrared wavelength range giving a peak value of an infrared absorptance different from that of water. In the following, referred to as "non-water-based component"), a heating method for heating a coating agent containing the same and suppressing the heating of moisture in the base material, and an infrared wavelength range that gives a peak value of infrared absorptance is the same as that of water. The present invention relates to a heating method for heating a non-water-based component in an object to be heated containing different non-water-based components and water and suppressing heating of the water.

[Prior art]

Conventionally, there is a heating method using infrared rays as one of methods for heating a solvent in a coating material applied to a base material. In this heating method, infrared rays emitted from an infrared heater are irradiated to a substrate being transported and moved, and a solvent in a coating agent is heated by the infrared rays. The solvent gas dried and evaporated by the heating is forcibly exhausted from the heating surface to the outside by an exhaust device in order to promote heating and prevent explosion. 2.5 infrared heater
Those that emit infrared rays in the wavelength range of 2525 μm are generally used.

[Problems to be solved by the invention]

By the way, the infrared wavelength range giving the peak value of the infrared absorptivity for water is around 2.9 μm and around 5.8 μm,
It is different from that of the solvent in the coating composition. Accordingly, when the base material is irradiated with infrared rays of 2.5 to 25 μm emitted from the infrared heater, not only the solvent in the coating material but also the moisture contained in the base material are heated, and the base material is over-dried. However, the over-dried state of the substrate has a problem that it causes inconveniences such as a decrease in substrate strength and a dimensional change due to substrate contraction. With the recent remarkable technological innovation, non-water-based components (for example, organic solvents, pigments, waxes, etc.) in a sheet or the like to be heated in paper production or resin film production.
There has been a social demand to promote the heating of water and suppress the heating of water contained in the object to be heated. However, in the conventional heating method using infrared rays, the heating of moisture is performed in parallel with the heating of non-water-based components, and thus there is a problem that the above-mentioned social demands cannot be met. The present invention provides a heating method using infrared rays that can prevent overdrying of moisture in a substrate, and heating of non-moisture-based components in an object to be heated and heating of moisture in order to solve the above problems. It is an object of the present invention to provide a heating method using infrared rays for suppressing the heat generation.

[Means for Solving the Problems]

The first means adopted by the heating method using infrared rays according to the present invention (hereinafter, referred to as “the present invention heating method”) is as follows. In a heating method for applying a coating material containing a component different from that of water, the method is to irradiate the coating material with infrared rays excluding a wavelength range that gives a peak value of infrared absorption of water. The second means adopted by the heating method of the present invention is a method of heating an object to be heated in which an infrared wavelength range giving a peak value of an infrared absorptivity contains water and a component different from that of water. Irradiating the object to be heated with infrared rays excluding the wavelength range that gives the peak value of.

[Action]

In the first means, since the wavelength range that gives the peak value of the infrared absorptivity of water is excluded from the infrared rays radiated toward the coating agent and the base material, the coating applied to the base material is excluded. The non-water-based component in the agent is heated and the heating of the water in the base material is suppressed. In the second means, since the wavelength range that gives the peak value of the infrared absorptivity of water is excluded from the infrared light radiated toward the object to be heated, non-water components in the object to be heated are removed. While heating, the heating of the moisture contained in the object to be heated is suppressed.

【Example】

Hereinafter, the drying method of the present invention will be described based on examples shown in the drawings. First Embodiment FIGS. 1 to 3 show a first embodiment of the heating method of the present invention. In this embodiment, a coating material C (for example, ink, lacquer or adhesive, etc.) applied or impregnated on a sheet-like base material B containing water (for example, newspaper, wood plywood or hydrophilic film) is heated. The sheet-shaped substrate B is conveyed in the direction of arrow E at an appropriate speed. As shown in FIG. 3, the infrared irradiation apparatus 1 used in the heating method of the present invention includes an irradiation apparatus main body 2 facing a conveyance path R of a base material B.
, An air supply device 3 and an exhaust device 4. As shown in FIGS. 1 and 2, the irradiation device main body 2 includes a reflector 5 composed of a curved reflector 5a, an infrared heater 6 housed in the reflector 5 and long in the width direction W of the transport path R, An outlet 7 and a suction port 8 opened along the opening longitudinal edges 5b, 5c of the tool 5,
An air supply chamber 9a communicating with the outlet 7 and a box 9 having a suction chamber 9b communicating with the suction port 8 are formed. The reflector 5 is provided with an appropriate number of blowout holes 5e and air supply holes 5f as necessary, so that the infrared heater 6 is forcibly cooled. The gas supply device 3 supplies a gas containing water to the gas supply chamber 9a, and includes a gas supply fan 10 and a water mixing device 11a.
And a duct 12. The water mixing device 11 includes nozzles 11a and 11a that mix water mist and / or water vapor into a gas such as air.
a ... and a water supply amount control valve 11b. The exhaust device 4 includes a duct 13 communicating with the suction chamber 9 b and an exhaust fan 14.
Consists of When the infrared irradiation device 1 starts the air supply device 3 and the exhaust device 4, the infrared irradiation device 1 blows out a moisture-containing gas from the blowout port 7 of the irradiation device body 2 toward the suction port 8, and covers the entire front surface of the opening 5 d of the reflector 5. A moisture-containing gas layer F is formed over the entire surface. While passing through the moisture-containing gas layer F, the infrared region IR-1 radiated from the infrared heater 6 absorbs a wavelength region around 2.9 μm and around 5.8 μm into the moisture-containing gas layer F, and the infrared absorption rate of water is 2.9 is the wavelength range that gives the peak value
Infrared light I excluding wavelength region around μm and around 5.8 μm
Irradiation is performed on the coating material C and the base material B as R-2. The infrared ray IR-2 irradiated toward the coating material C and the base material B is excluded from the wavelength range that gives the peak value of the infrared absorptance of water. And the water in the base material B is not heated. (Second embodiment) Fig. 4 shows a second embodiment of the drying method of the present invention. This embodiment is significantly different from the first embodiment in that an irradiation device main body 22 having a water film forming device 23 disposed between the infrared heater 6 and the transport path R is used. Water film former
23 forms a water film forming passage 23b between two infrared transmitting plates 23a, 23a made of a glass plate, a resin plate or the like, and a water supply pipe 23d.
To form a thin water film G in the water film forming passage 23b. The water film forming device 23 has an infrared IR-1 around 2.9 μm and 5.8 μm
Blocks near wavelength regions. The irradiation device main body 22 includes:
In order to cool the water film former 23, the blower 24
In some cases, a cooling gas is blown from the suction port 27 toward the suction port 28. Third Embodiment FIG. 5 shows a third embodiment of the drying method of the present invention. This embodiment is different from the second embodiment in that:
The point is that the irradiation device main body 32 in which a filter plate 33 is arranged between the infrared heater 6 and the transport path R is used. Filter board
33 is near 2.9 μm and 5.8 μm in the incident infrared IR-1
This is to block a wavelength region in the vicinity. The irradiation device main body 32 is provided with a blowing device to cool the filter plate 33.
At 24, the cooling gas may be blown from the outlet 27 toward the suction port 28. (Study of Other Examples) In the above examples, the coating material C applied or impregnated on the base material B was used.
It is intended for heating. However, the object to be heated by the heating method of the present invention is not limited to those in the above-described embodiment, and a non-water component (for example, an organic component) having an infrared wavelength range that gives a peak value of an infrared absorptance different from that of water is used. solvent,
Pigments or waxes) and water-containing paper or hydrophilic films may be used. In each of the above embodiments, the infrared heater 6 is used.
By providing a water-containing gas layer F, a water film G, or a filter plate 33 between the infrared heater 6 and the transport path R, 2.9 μm
Infrared IR-2 not including near and 5.9μm wavelength region
Is irradiated on the base material B. However, the heating method of the present invention
The present invention is not limited to the above embodiment, and although not shown, the base material B (or the object to be heated) is irradiated with an infrared laser having a wavelength excluding the wavelength region around 2.9 μm and around 5.8 μm. It is possible to not only heat the non-water-based components in (or in the non-heated material) but also suppress the heating of the water in the base material B (or in the heated object).

【The invention's effect】

As described in detail above, the heating method of the present invention prevents overheating of the substrate by heating non-water components in the coating agent applied to the substrate and suppressing heating of moisture in the substrate. can do. As a result, the heating method of the present invention has an excellent effect of heating while maintaining the strength of the substrate and the dimensions of the substrate. Further, the heating method of the present invention can meet social demands for heating non-water-based components in an object to be heated and suppressing heating of moisture contained in the object to be heated. As a result, the heating method of the present invention makes it possible to provide a heating method that responds to dramatic technological innovation.

[Brief description of the drawings]

FIGS. 1 to 3 show a first embodiment of the heating method of the present invention. FIG. 1 is a perspective view showing the irradiation device main body with the middle part omitted, and FIG. 2 is II in FIG. FIG. 3 is a side cross-sectional view taken along the line II, showing the entire infrared irradiation device. FIG. 4 is a side sectional view showing a second embodiment of the heating method of the present invention. FIG. 5 is a side sectional view showing a third embodiment of the heating method of the present invention. B: Base material, C: Coating agent IR-2: Infrared light excluding the wavelength range that gives the peak value of water absorption rate

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B05D 3/02 H05B 3/10 B05C 9/14

Claims (2)

(57) [Claims] (1) A heating method comprising: applying a coating material containing a component having a different infrared wavelength range from water to a substrate containing water to a substrate containing water;
A heating method using infrared rays, which comprises irradiating the coating agent with infrared rays excluding a wavelength range that gives a peak value of an infrared absorptivity of water. 2. A method for heating an object to be heated containing an infrared wavelength range giving a peak value of infrared absorptivity and water and a component different from that of water. A heating method using infrared rays, which comprises irradiating the object to be heated with the removed infrared rays.