JP3235887B2 - Drying method for moisture content - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for drying a water-containing substance. More specifically, the present invention relates to a drying furnace for drying an object to be dried made of a water-containing substance using an infrared lamp.

[0002]

2. Description of the Related Art Conventionally, for drying water-containing materials such as ceramics, magnetism, bricks, and tiles, it is necessary to use a hot-blast furnace, for example, in the case of refractory bricks at a temperature of 100 ° C. or less for about 24 hours.
It is generally done over time, like drying over time. After drying, for example, firing is performed in a firing furnace at 1100 to 1200 ° C. This is because if the material is rapidly heated in a drying oven and dried in a short period of time, cracks and cracks are likely to occur due to the partial difference in water content, particularly when there is a thick portion. Therefore, drying is performed over a long period of time while giving a relatively gentle temperature so that the drying of the whole object to be dried becomes uniform.

[0003]

However, the conventional method of drying a water-containing material has a problem that a long time is required for drying and a large amount of space for a drying process is required for mass-produced products.

[0004] Conventionally, a clay-containing water-containing base material such as pottery, magnetism, bricks, and tiles has been molded at a temperature of 100 to 200 °.
The peak of the wavelength is 1.2 μm-1.
When irradiation with near-infrared light near 4 μm was performed for about 30 minutes, it was found that cracking did not occur even after firing.

[0005] On the other hand, fish bodies containing water are generally baked using so-called far-infrared rays having a wavelength peak near 3.5 µm. According to experiments conducted by the inventor, the peak of the wavelength is 1.2 µm. It has been found that when a so-called near-infrared lamp having a wavelength of about 1.4 μm is used, when the protein of the fish is altered to an extent that it can be tasted, water remains in the fish and is not suitable for taste.

It is presumed that the so-called near-infrared ray having a wavelength peak in the vicinity of 1.2 μm to 1.4 μm when heating a water-containing substance is less affected by the solvent than by heating the solute. You.

[0007]

Means for Solving the Problems The present invention provides

An infrared ray having a wavelength peak around 1.2 μm to 1.4 μm is added to the water content of the mineral viscous material.
A method for drying a water-containing substance, which is performed by irradiating in a 250 ° C. atmosphere;

Is provided.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

Reference numeral 11 denotes a drying furnace main body. Drying furnace body 11
Is composed of a chevron furnace or a tunnel furnace, and is formed tightly except for the entrance of the object to be dried and the exit of the object to be dried. Inside the drying furnace main body 11, there is provided a transporting means such as a conveyor which communicates from the outside to the outside of the object to be dried through the inlet for the object to be dried. Hot air is blown into the drying furnace main body to maintain the atmosphere temperature in the furnace at 100 to 200 ° C.

Reference numeral 21 denotes a lamp. The lamp 21 is an infrared lamp. In this embodiment, the peak of the wavelength is 1.
A so-called near-infrared lamp around 2 μm to 1.4 μm is used.

Reference numeral 31 denotes a material to be dried. In this embodiment,
Ceramics, magnetism, bricks, tiles, etc., containing hydrogen-containing material such as mineral viscous material, for example, the fabric thickness is 7-9m
m, made of large ceramic cloth with a total weight of 18 kg.

Next, the operation of the first embodiment will be described. Hot air is blown into the furnace to maintain the furnace temperature at 150 ° C. Then, the fabric thickness is 7-9mm, total weight 18
An object to be dried 31 made of large Kg ceramic material is carried into a furnace, and irradiated with infrared rays having a peak around 1.2 to 1.4 μm. The object to be dried 31 is dried in a furnace for 30 minutes and carried out. Thereafter, firing is performed at 1100 to 1200 ° C.

Further, the operation of the second embodiment will be described. The temperature inside the furnace is maintained at 200 ° C., and the object to be dried 31 carried into the furnace is irradiated with infrared rays having a peak around 1.2 to 1.4 μm for 5 minutes. Next, it is carried out and left at normal temperature for 10 minutes. The same process is repeated twice more. 150 °
It is possible to avoid the occurrence of cracks and cracks as compared with drying in a furnace maintained at C for 30 minutes. Even if three furnaces are installed and the object to be dried 31 is continuously conveyed, it may be once carried out of the furnace, left at room temperature, and then carried back into the furnace.

(First Embodiment)

Next, the water content (%) after 30 minutes of the porcelain having a dough thickness of 7 to 9 mm and a total weight of 18 kg, which is a material to be dried using the first embodiment, the hot blast stove, and the far-infrared stove is used. The contrast is shown below.

Hot air stove Far infrared furnace Example of the present application (near infrared furnace)

A 40 30 Less than 1

B 55 50 1

C 65 80 1

D 70 80 Less than 1

The wind speed in the furnace is 0.5 to 1.0 m / sec, and the temperature in the furnace is 150 ° C.

Cracking occurred during drying in both the hot air oven and the far infrared oven. In this example using near-infrared rays, no cracks were generated after drying and after firing at 1100 to 1200 ° C.

(Second embodiment)

An object to be dried which is 10 mm or more thicker than the object to be dried which has been dried in the first embodiment, and which is slightly cracked when dried under the conditions shown in the first embodiment. Was irradiated in a furnace atmosphere at 200 ° C. for 5 minutes with an infrared ray having a wavelength peak around 1.2 to 1.4 μm. Then, it was left in an atmosphere of 100 ° C. or lower for 10 minutes. This was performed three times as one cycle. The moisture content (%) of the material to be dried after three cycles is shown below.

Second Embodiment (Near-infrared furnace)

A Less than 1

B less than 1

C 1

D less than 1

[0032] After drying, no product defects such as cracks occurred after firing.

[0033]

Therefore, according to the present invention, it is possible to dry the moisture-containing material without causing defects such as cracks.

[Brief description of the drawings]

FIG. 1 is a central cross-sectional view of an embodiment of the present invention.

[Explanation of symbols]

 11 Drying oven body 21 Lamp

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-114763 (JP, A) JP-A-4-114764 (JP, A) JP-A-4-85992 (JP, A) JP-A Sho 57- JP-A-60-76346 (JP, A) JP-A-54-137769 (JP, A) JP-A-6-101965 (JP, A) JP-A-6-300440 (JP, A) JP-A-63-185851 (JP, A) JP-A-2-77588 (JP, U) JP-A-59-54924 (JP, U) JP-A-59-91587 (JP, U) Patent 2527861 (JP, B2) (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) F26B 3 / 00,23 / 04,15 / 00 C04B 33/30

Claims (1)

(57) [Claims] 1. An infrared ray having a wavelength peak of about 1.2 μm to 1.4 μm is added to a water content of a mineral viscous substance.
A method for drying a water-containing substance, wherein the irradiation is performed in an atmosphere of 200 to 200 ° C.