JPH02265188A - Manufacture of tubular heater - Google Patents

Abstract

PURPOSE:To improve productivity and mass production for obtaining comfortably heating by coating the tubing surface with a far infrared ray radiation material by a transcription method. CONSTITUTION:The surface of a visible ray part light transmitting tubing is coated with a far infrared ray radiation material by a transcription method. Practically, far infrared ray radiation transcription paper for coating the tubing surface is manufactured by a method wherein firstly a far infrared ray radiation material is allover-or pattern printed on ground paper for transcription whereon a water-soluble paste layer is formed by plate screen printing followed by simple overcoating. By performing printing here in a relatively large area, production of a large number sheets of far infrared ray radiation material transcription paper required for coating one tubing surface becomes possible. Also after a larger quantity of far infrared ray radiation material transcription paper is produced at a time, a small quantity of production corresponding to all kinds of needs become position by care and storage thereof. Thereby, productivity and mass production are improved for being able to be used as a home heating equipment having an immediate effect and continuous comfort.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method of manufacturing a tubular heater using electrical energy, which is used in home heating appliances and the like.

Prior Art Conventional tubular heaters have a built-in coiled metal wire such as nichrome wire or tungsten wire as a heat source, and the tubular body is made of quartz glass or stainless steel. However, the heat capacity of what is generally referred to as a sheathed heat sink using stainless steel is large, making it unsuitable for fields that require immediate action, such as home heating. Tubular ceramic heaters are also used industrially, but they have a larger heat capacity and are unsuitable for fields that require immediate action, such as home heating.

Therefore, the tubular heaters currently used for boat fishing, household heating, etc. are made by incorporating a metal wire such as a nichrome wire in a coiled state in a quartz glass sheath. This tubular heater became red hot when electrical energy was applied to it, so it also had the important effect of being able to provide a sense of warmth through visual inspection.

Furthermore, in recent years, far-infrared heating has become popular in the field of home heating, etc., and is being actively researched, commercialized, and becoming popular in general. This is made by coating the surface of the tubular heater with a far-infrared radiation material. Spray dip, screen printing, etc. have been considered as coating methods.
Screen printing is the most commonly used. The reason for this is that although the spray or dip method is a very simple method, it is difficult to make the film thickness uniform, and as a result, when the light from the tubular heater is transmitted through it, it looks very unsightly. It was because it was put away.

Problems to be Solved by the Invention As mentioned above, screen printing is a common method for forming a far-infrared radiation material coating on the surface of a tubular body for the purpose of far-infrared heating. I have a problem.

Specifically, since screen printing on the surface of a tubular body results in printing on a curved surface, the printed tubular body must be positioned, and it is also troublesome to move the printed tubular body each time.

In addition, since the firing process to form a film of far-infrared emitting material on the surface of the tubular body is carried out at a temperature of 500°C or higher in consideration of practical conditions, the printing paste is preferably water-based in consideration of its adhesion to the tubular body. used. However, if you are not careful during printing, water-based products often dry partially, resulting in screen clogging.

As a result, productivity and mass production are currently not very good.

In addition, in the field of household heating, for example when heating with an electric kotatsu, the tubular heater not only heats the human body, but also heats the odor of the human body (feet) and other objects to be heated (futon). becomes.

Generally, the higher the temperature, the stronger the smell is perceived by the human nose. For this reason, if you use an electric kotatsu and turn on the heat, the smell of the human body (feet) and other heated objects (futon) will naturally become stronger. If that odor leaks into the room, it will cause discomfort to humans.

Therefore, this odor problem is also an issue to be solved.

The present invention is based on the above-mentioned conventional problems, and an object of the present invention is to provide a method for manufacturing a tubular heater that can provide comfortable heating using a simple manufacturing method.

Means for Solving the Problems The present invention has the following features: (1) Using a transfer method, the surface of a tubular body transparent to visible light, which has a built-in coiled metal wire as a heat source, is A method for producing a tubular heater characterized by coating an infrared ray emitting material, (2) a far infrared ray emitting material transfer paper comprising a paste layer, a far infrared ray emitting material layer, and an overcoat layer laminated in this order on a transfer mount; (3) A method for manufacturing a tubular heater, characterized in that the far-infrared emitting material is activated alumina, zirconium oxide or At least one selected from titanium dioxide
(4) the far-infrared emitting material is made of glass and at least one oxide selected from activated alumina, zirconium oxide, or titanium dioxide; (5) In the present invention, the far-infrared emitting material is formed into a tubular shape by a conventional direct screen printing method, in which a platinum group metal is supported on at least one oxide selected from activated alumina, zirconium oxide, or titanium dioxide. Instead of forming a film of far-infrared emitting material on the body surface, a film is formed using a transfer method. The manufacturing method has the following advantages.

Specifically, the far-infrared emitting material transfer paper for coating the surface of the tubular body is made by first printing the far-infrared emitting material solidly or in a pattern on a transfer mount on which a water-soluble adhesive layer has been formed. It is made by printing and then a simple overcoat. By performing this printing over a relatively large area, it becomes possible to produce a large number of sheets of far-infrared emitting material transfer paper necessary for coating the surface of one tubular body. Furthermore, even after producing a large amount of far-infrared emitting material transfer paper at one time, by managing and storing it, it is possible to produce small quantities to meet all needs.

As a result, productivity and mass production improve dramatically.

Further, since the transfer method itself is a relatively simple method that has been used for a long time, there is almost no complexity in the manufacturing process.

Moreover, in the present invention, the catalyst metal is also heated by supporting the catalyst metal on the far-infrared emitting material.

At this time, the temperature of the catalytic metal is raised to an active temperature at which it can exert its catalytic effect, purifying and deodorizing the human body (feet) and the objects that are heated on the ground (futon). As a result, comfortable heating can be provided.

In consideration of heat resistance and thermal shock resistance, it is preferable to use quartz glass for the visible light-transmitting tubular body of the present invention. Furthermore, in order to improve the adhesion with far-infrared emitting materials,
It is preferable to use a tubular body whose surface has been previously treated to enlarge its specific surface area by chemical polishing or mechanical polishing.

Further, as the far-infrared emitting material used in the present invention, activated alumina, zirconium oxide, or titanium dioxide is preferable. These have excellent far-infrared radiation characteristics and are also excellent as catalyst supports. In addition, in order to exhibit excellent far-infrared radiation properties and catalytic properties, activated alumina, zirconium oxide, or titanium dioxide with a small particle size (approximately 1 to 5 μm) must have a large specific surface area and must be kept porous. is important.

Furthermore, glass may be added as a binding binder to activated alumina, zirconium oxide, or titanium dioxide for the purpose of improving adhesion to the tubular body. The glass referred to here is one that exhibits an amorphous state by XRD, and specifically includes glass obtained from lithium aluminosilicate, sodium borosilicate, etc., or alumina sol,
Amorphous alumina and amorphous silica obtained from silica sol etc.

In addition, there are no particular restrictions on the transfer mount for producing the far-infrared radiation material transfer paper, but it may be one that is water resistant, has a thickness of 50 to 500 μm, and has a certain degree of stiffness. . Further, as the glue layer, a rewetting adhesive is preferable, and specifically, dextrin, casein, PVA
1 starch, glue, etc., but for the purpose of the present invention it is considered preferable to use dextrin and PVA in combination. Further, the overcoat layer on the far-infrared ray emitting material layer is required to have flexibility and mechanical strength in the step of transferring the transfer paper separated from the transfer mount to the tubular body after being immersed in water. And, to fulfill this purpose,
Examples include acrylic resin, vinyl resin, 'PET resin, etc., but acrylic resin is considered preferable for the purpose of the present invention. Furthermore, since the overcoat layer is not required to be precisely formed in thickness, it may be formed by simple spraying or the like.

As mentioned above, the screen printing of the far-infrared emitting material layer may be either solid printing or pattern printing, but pattern printing is preferred from the viewpoint of appealing to the warmth generated by the red heat of the tubular heater. In addition, partial coating (pattern printing) of far-infrared emitting material on the surface of the tubular body allows for more effective use of near-infrared radiation from the internal heat source and far-infrared radiation from the coating layer, resulting in immediate effect and continuous comfort. It can be provided as a home heating appliance with a high temperature. Although the printed pattern can be freely selected such as a lath or dot shape, the characteristics of the tubular heater of the present invention are related to the covered area and the coating thickness.

Example Examples of the present invention will be described below.

(Example 1) Dextrin:PVA=5:10 paste (viscosity 1
0000 cps) with a thickness of 10 μm, and then
Activated alumina supported with 1.0g and 10.5g of Pt and Pd (average particle size 2u fTh specific surface area 15
0 m2/g) 100 g, PVA 300 m gl, a paste consisting of 50 g of water, and 2 g of glycerin (viscosity: 500 m2/g)
0CT)S) was screen printed in a lath pattern to a thickness of 30 μm.

At this time, the printed coating area was 50% of the entire area.

Furthermore, an acrylic resin was screen printed on it to a thickness of 10 μm. The transfer paper thus obtained was cut to a predetermined size, immersed in water for several minutes, and after peeling off the transfer paper from the coated paper, the outer diameter was 10 m rr and the wall thickness was 1.0.
After transferring it onto the surface of a quartz glass tubular heater with a length of 150 mm and removing air bubbles interposed between the transfer paper and the tubular body with a squeegee rubber, drying and heat treatment at 500 ° C. for 1 hour, A far-infrared radiation tubular heater A carrying a catalyst metal was obtained.

(Example 2) Alumina titania (A 120a: T i O2 = 4:
1), and then milled in a shed mill to reduce the average particle size to 1
It was set as μm. Pt1 to 100g of this alumina/titania
Pd was 1. 0g, 0. 5g was supported. In Example 1, Pt and Pd are each 1
．． 0g, 0. By replacing 5 g of activated alumina supported with this alumina titania, a far-infrared radiating tubular heater B having a catalyst metal supported thereon was obtained.

(Example 3) Activated alumina (specific surface area: 150 m2/g) was treated with zirconium oxychloride, and 20 g of zirconium oxide was supported on 100 g of activated alumina.

Each of 1.0 g and 10.5 g of PT and PD was supported on this activated alumina supporting zirconia oxide. And Example 1
, Pt1 and Pd are each 1゜0g10.5g
The supported activated alumina was replaced with this zirconium oxide supported activated alumina to obtain a far-infrared radiation tubular heater C on which a catalyst metal was supported.

(Example 4) In Example 1, Pt and Pd were each 1°0 gs.
o, 5g supported activated alumina (average particle size 2
μm1 Specific surface area 150 m2/g) 100
Using a paste (viscosity: 5800 cl) consisting of 50 g of boehmite aqueous solution containing 10 wt% of alumina, 300 mg of PVA, and 2 g of glycerin, a far-infrared radiation tubular heater D carrying a catalyst metal was obtained.

(Example 5) In Example 1, Pt and Pd were each 1°0g10
．． 5g supported activated alumina (average particle size 2μm1
Specific surface area 150m2/g) 100g 1 alumina content 1
40g of boehmite aqueous solution containing 0wt% 10g of silica sol containing 20wt% of silica, PVA300
mg, a paste consisting of 2 g of glycerin (viscosity 13
000cl)s) to obtain a far-infrared radiation tubular heater E on which a catalyst metal was supported.

(Example 6) In Example 1, Pt1 and Pd were each 1.0g10
．． 5g supported activated alumina (specific surface area 150m2/
g) 100g1 PVA300mg.

10 g of lithium aluminosilicate was added to a paste consisting of 50 g of water and 2 g of glycerin to obtain a far-infrared radiation tubular heater F on which catalyst metal was supported.

(Example 7) In Example 1, Pt1 and Pd were each 1.0g5o
, 5g supported activated alumina (specific surface area 150m2/
g) 100g1 PVA100mg1 water 50g
10 g of sodium borosilicate was added to a paste consisting of 2 g of glycerin to obtain a far-infrared radiation tubular heater G on which catalyst metal was supported.

(Comparative example) A regular tubular heater was used.

FIG. 1 shows the infrared emissivity of tubular heater A of Example 1 and a conventional tubular heater as a comparative example at 500°C.

From this result, the tubular heater A of Example 1 is an excellent tubular heater that can simultaneously emit near-infrared rays and far-infrared rays. Further, the tubular heaters B to G of Examples 2 to 7 also exhibited substantially similar characteristics to those of the Examples.

Using the two tubular heaters of Examples 1 to 7 and the comparative example, an electric kotatsu with the tubular heater 1 and fan 2 arranged inside the main body 3 as shown in Fig. 2 was made, and a deodorizing effect test was conducted. Ta. While applying electricity of 300W to this electric kotatsu,
Trimethylamine was injected into a sealed container measuring 0 mm x 900 mm x 350 mm to a concentration of 501)I)m. Subsequent changes in concentration were measured by gas chromad analysis. Table 1 shows the change in concentration (ppm) over time.

Table 1 As a result, it was revealed that the tubular heaters A to G of Examples 1 to 7 of the present invention exhibited excellent catalytic action and were effective in deodorizing.

In order to examine the adhesion of the tubular heaters A to G of Examples 1 to 7, the following severe adhesion test was conducted. First, the tubular heater was energized at 500 W for 5 minutes to bring the surface temperature of the tubular heater to approximately 700°C, then the energization was stopped, the fan was used to cool it down to room temperature, and then the current was energized again for rapid heating and rapid cooling. After the test was repeated 1000 times, a tubular heater was further installed in the vibrator, and a vibration test was performed for 1 hour in which the test was made to reciprocate over a distance of 30 mm 150 times per minute. The results were evaluated as follows, and Table 2 shows each peeling rate. In addition, the peeling rate was calculated|required by the following formula.

Table 2 Based on the results, the tubular heater A- of Examples 1 to 7 of the present invention
It was found that G provides adhesion that can withstand a fairly severe adhesion test. It has also been found that even better adhesion can be obtained by adding glass to this surface coating layer.

Effects of the Invention As described above, in the present invention, as a tubular heater for home heating equipment, etc., productivity is improved compared to conventional methods by coating the surface of a tubular body with a far-infrared radiating material using a simple technique called a transfer method. , we were able to improve mass productivity.

Furthermore, in the present invention, by supporting a catalytic metal on the far-infrared emitting material, unpleasant odors can be purified and deodorized by the catalytic action.

[Brief explanation of drawings]

FIG. 1 is a characteristic diagram showing the infrared emissivity of the tubular heaters of Example 1 of the present invention and Comparative Example 1, and FIG. 2 is a configuration diagram of an electric kotatsu for testing the deodorizing effect. 1...tubular heater, 2...fan, 3...main body of electric kotatsu.

Claims (5)

[Claims] (1) A far-infrared ray emitting material is coated on the surface of a visible light-transparent tubular body containing a coiled metal wire as a heat source using a transfer method. A method of manufacturing a tubular heater. (2) After transferring the far-infrared emitting material transfer paper, which is composed of a glue layer, a far-infrared emitting material layer, and an overcoat layer laminated in this order on a transfer mount, to the surface of the visible light-transparent tubular body, 2. The method of manufacturing a tubular heater according to claim 1, wherein the film is formed by drying and firing. (3) The method for manufacturing a tubular heater according to claim 1 or 2, wherein the far-infrared emitting material is made of at least one oxide selected from activated alumina, zirconium oxide, and titanium dioxide. (4) The method for manufacturing a tubular heater according to claim 1 or 2, wherein the far-infrared emitting material is made of glass and at least one oxide selected from activated alumina, zirconium oxide, or titanium dioxide. (5) Manufacture of the tubular heater according to claim 1 or 2, wherein the far-infrared emitting material is formed by supporting a platinum group metal on at least one oxide selected from activated alumina, zirconium oxide, or titanium dioxide. Method.