JP2008078065A - Bulb type heater and bulb type heater manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance efficiency of power of lighting a halogen lamp, by aiming at improvement of heat distribution characteristics and spectral characteristics of a halogen lamp equipped with a white-coated reflective film and a light and heat aperture on an outer face of a radiation transmitting bulb. <P>SOLUTION: A halogen lamp 11 is structured by sealing a filament 13 of high-melting-point metal, halogen gas and inert gas in a radiation transmitting bulb 12 and sealing both ends of the bulb with sealing end parts 151, 152. A reflective film 20 is coated on an outer surface of the bulb 12 using a reflective film material mainly composed of silica. The reflective film 20 is formed by carrying out coating so as parts other than the light and heat aperture 21 to be a given aperture angle in a major axis direction of the bulb 12, a thickness of the reflective film to be 100 μm or more and 300 μm or less. With this, heat distribution characteristics and spectral characteristics can be improved to aim at enhancement of efficiency of power for lighting the halogen lamp 11. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a bulb-type heater and a bulb-type heater that are used for heating, heating, and the like at the time of producing a PET bottle in which a high-melting-point metal filament is sealed in a radiation transmissive bulb and halogen is enclosed. Regarding the method.

A halogen bulb with an infrared reflecting film, which is a conventional halogen lamp for heat generation, is a reflective film leaving a photothermal radiation opening that does not form a light interference film along the surface in the long axis direction of the translucent tube envelope. An optical interference film is formed. The photothermal radiation opening is formed into a rough surface by frosting. The optical interference film is formed by alternately laminating metal oxide film layers having a high refractive index such as titanium oxide and tantalum oxide and metal oxide film layers having a low refractive index such as silicon oxide. Is about 0.1 μm to 0.3 μm, reflects infrared rays emitted from the filament, and transmits visible light. (For example, Patent Document 1)
JP-A-7-230795

  In the technique of Patent Document 1 described above, for example, a heater with a reflective film is usually used as a heater for manufacturing PET bottles, but there are some that have poor spectral characteristics, and in recent years, the demand in the beverage market has expanded. In companies that manufacture PET bottles, the heating amount of the heater that heats the test tubular preform that forms the PET bottle into the shape of the PET bottle greatly affects the power consumption. The machine that molds requires 200 to 400 halogen bulb heaters per machine, and there has been a demand for improving spectral characteristics and reducing the overall power consumption. In addition, when used as a fixing heater, the current situation is that the demand for power saving has not been fully answered.

  An object of the present invention is to provide a light bulb type heater capable of reducing power consumption by improving spectral characteristics and a method of manufacturing the same.

  In order to solve the above-mentioned problems, a light bulb type heater according to the present invention is a light bulb configured by sealing a radiation transmissive bulb, a refractory metal filament sealed in the bulb, and a halogen gas together with an inert gas. In the mold heater, the outer surface of the bulb is coated with a reflective film material mainly composed of alumina and silica, and a coating having a predetermined opening angle other than the photothermal opening is applied in the major axis direction of the bulb. The thickness is 100 μm or more and 300 μm or less.

  In addition, the bulb-type heater manufacturing method of the present invention includes a radiation-transmitting bulb, a refractory metal filament sealed in the bulb, and a halogen gas together with an inert gas, and then both ends of the bulb are sealed. Reflective film material mainly composed of alumina and silica, which is preliminarily melted from one sealed end to the other sealed end of the tube heater, forming a bulb-type heater Is immersed in a liquid tank, and the tubular heater is pulled up over a predetermined time in the major axis direction to coat a reflective film having a thickness of 100 μm or more and 300 μm or less, and a predetermined opening angle is formed in the major axis direction of the tubular heater. It cut so that it might become, and the photothermal opening part was formed, It is characterized by the above-mentioned.

  In addition, another bulb-type heater manufacturing method of the present invention encloses a radiation transmissive bulb, a refractory metal filament sealed in the bulb, and a halogen gas together with an inert gas, and then seals both ends of the bulb. A bulb-type heater is formed by sealing at the toe end, a cap is placed on both sealed ends of the tube-type heater, and after sealing each gas, the tip is formed in advance from the tip formed on the bulb. A reflective film material mainly composed of molten alumina and silica is immersed in a liquid tank, and the tubular heater is pulled up over a predetermined time to coat a reflective film having a thickness of 100 μm to 300 μm, and the tubular heater The photothermal opening is formed by cutting so as to have a specified opening angle in the major axis direction.

  According to the present invention, it is possible to obtain a halogen lamp with improved heat distribution characteristics and spectral characteristics. Therefore, it is possible to improve the efficiency of electric power for lighting the halogen lamp.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

1 to 3 are diagrams for explaining one embodiment of a light bulb type heater according to the present invention. FIG. 1 is a block diagram showing the overall configuration of the halogen lamp, and FIG. 2 is an enlarged view of the main part of FIG. FIG. 3 is a sectional view taken along line xx ′ of FIG.
1 and 2, reference numeral 11 denotes a halogen lamp. The halogen lamp 11 is, for example, a tube type often used as a heater for preforming or heating a PET bottle, and has a bulb 12 made of quartz glass having radiation permeability. The bulb 12 contains a tungsten filament 13 which is an example of an electric resistance wire of a refractory metal in a concentric manner as a heat source. The filament 13 is kept concentric with the valve 12 by a plurality of anchors 14 provided in the valve 12 in the axial direction.

  The bulb 12 is filled with argon (Al) as an inert gas, filled with a certain amount of halogen gas, and rectangular by a pinch seal that crushes both ends of the bulb 12 in the diametrical direction. A pair of flat sealing end portions 151 and 152 are formed. In these sealed end portions 151 and 152, rectangular foil-shaped metal foils 161 and 162 made of conductive, for example, molybdenum (Mo) having an expansion coefficient approximate to that of the valve 12 are embedded. Reference numeral 121 denotes a chip portion sealed after argon gas or halogen gas is sealed in the bulb 12.

  Each of the metal foils 161 and 162 is connected to the inner end thereof at both ends in the axial direction of the filament 13 via a pair of inner lead wires 171 and 172, while the outer end is connected to a pair of outer power supplies. Lead wires 181 and 182 are connected to each other. The outer lead wires 181 and 182 extend from the sealed end portions 151 and 152 to the outside in an airtight manner.

  The outer surface of the bulb 12 is coated with a reflective film 20 that reflects white paint. The reflective film 20 is coated with a reflective film material mainly composed of alumina and silica except for the photothermal opening 21 so as to have a specified opening angle in the major axis direction of the bulb 12 and is baked. The film thickness of the reflective film 20 is in the range of 100 μm to 300 μm.

  By setting the film thickness of the reflective film 20 in the range of 100 μm to 300 μm, it is possible to improve the output of white coating emitted from the photothermal opening 21 by suppressing the leakage of visible light from the reflective film 20.

  In addition, the boundary part of the bulb | ball 12 and the reflecting film 20 is cut off diagonally like FIG. 4 which shows the expanded sectional view of the enclosure y of FIG. This contributes to prevention of peeling of the reflective film 20.

  FIG. 5 shows a state in which lead wires 51 and 52 for power feeding are connected to the outer leads 181 and 182, respectively, and ceramic bases 53 and 54 for attachment are fixed with cement 55 and 56. .

Next, referring to FIG. 6, the wavelength (nm) and spectral output (μm / cm ² ) of the case where argon gas is sealed as the halogen gas and inert gas in the bulb 12 and the case where nitrogen gas is sealed. The relationship will be described.

  As can be seen from FIG. 6, it was found that the spectral characteristics were improved by about 20% when argon gas was sealed over the entire band of wavelengths from 400 nm to 2500 nm.

  Next, a comparison between the present invention and the prior art will be described with reference to FIGS. The film pressure of the conventional reflection film is 30 μm, and the film thickness of the reflection film of the present invention is 120 μm.

  As shown in FIG. 7, a comparison is made between the conventional case in which the thickness of the reflective film 20 is 30 μm and the case of the present invention in which the thickness is 120 μm. The heat distribution characteristics are shown in FIG. 8, and the spectral characteristics are shown in FIG. Respectively.

FIG. 8 shows the relationship between the spectral output (μm / cm ² ) when the wavelength is 400 nm to 2500 nm, and an improvement of about 20% can be achieved near the peak wavelength of 1100 nm.

  Although the thickness of the reflective film 20 here is 100 μm, the same effect can be obtained in the range of 100 μm to 300 μm.

  In the case of this embodiment, the heat distribution characteristic is about 20% to 30% and the spectral characteristic is 20 from the light aperture 21 of the halogen lamp 11 on which the reflective film 20 having a film thickness of 100 μm to 300 μm is formed. % Can be improved. For this reason, for example, it is possible to reduce the power consumption, which conventionally required 2 kW, to 1600 W to 1700 W. In other words, an improvement in productivity can be expected with the same heating amount.

  FIG. 9 shows the film thickness of the reflective film 20 in order to explain the relationship of the radiation ratio between the conventional 35 μm and the opening angle of the photothermal opening 21 at 100 μm, 150 μm and 300 μm of the present invention. In FIG. 9, the spectral output without the reflective film 20 is based on 100%.

  That is, when the film thickness is 35 μm and the opening angle is 90 ° (= reflective film angle 270 °), the radiation ratio does not exceed 200%. On the other hand, when the film thickness is 100 μm to 300 μm, the largest radiation ratio of about 210% or more can be obtained when the opening angle is the same 90 °. As is clear from FIG. 9, the radiation ratio is further improved when the thickness of the reflective film 20 is 100 μm to 300 μm and the opening angle of the photothermal opening 21 is 150 ° to 55 °.

  10 (a) to 10 (d) are explanatory views for explaining an embodiment of the method for manufacturing a light bulb type heater of the present invention.

  First, in FIG. 10A, the filament 13 is held concentrically by a plurality of anchors 14 arranged in the axial direction in the valve 12 in advance, and further, argon (Al) is sealed as an inert gas. A tube-type halogen lamp 11 is prepared in which a pair of rectangular flat end portions 151 and 152 are formed by pinch seals that enclose a capacity of halogen gas and squeeze both ends in the axial direction in the diameter direction.

  10B, from one sealed end 151 of the halogen lamp 11 to the bulb 12 and just before the sealed end 152 in the liquid tank 100 in which the reflective film material mainly composed of alumina and silica is melted. Immerse. As a result, as shown in FIG. 10C, the reflective film 20 is coated with a thickness in the range of 100 μm to 300 μm over the entire sealing end 151 and the bulb 12.

  Next, in FIG. 10D, cutting is performed so that the photothermal opening 21 is formed so as to have a predetermined opening angle of the sealing end 151 and the bulb 12. The cutting can be performed by using an edge portion of, for example, silicon rubber or Teflon (registered trademark) rubber, which is a curable resin, and scraping off an unnecessary portion of the reflective film.

  As a result, the halogen lamp 11 with a reflective film is formed in which the photothermal opening 21 having a desired opening angle of the reflective film 20 having a film thickness of 100 μm or more and 300 μm or less is formed. The film thickness can be adjusted by adjusting the viscosity of the reflective film material placed in the liquid tank 100.

  In the case of this method, it is possible to obtain a desired film thickness only by immersing the film thickness of the reflective film 20 once in the liquid tank 100. In addition, since the liquid film 100 is immersed in the liquid tank 100 from the longitudinal direction of the bulb 12, the reflective film material in the liquid dripping portion is a portion of the sealing end 151 to be cut later, so that the film thickness of the remaining reflective film 20 is uniform. Can also be realized.

  FIGS. 11A to 11C are explanatory views for explaining another embodiment of the method for manufacturing a light bulb type heater according to the present invention.

  First, in FIG. 11A, the filament 13 is held concentrically by a plurality of anchors 14 arranged in the axial direction in the valve 12 in advance, and further, argon (Al) is sealed as an inert gas. A tube-type halogen lamp 11 is prepared in which a pair of rectangular flat end portions 151 and 152 are formed by pinch seals that enclose a capacity of halogen gas and squeeze both ends in the axial direction in the diameter direction.

  In FIG. 11B, silicon caps 122 and 123 are placed on the sealing end portions 151 and 152 of the halogen lamp 11 in the liquid tank 100 in which the reflective film material mainly composed of alumina and silica is melted. Then, it is immersed in the liquid bath 100 to a position where the photothermal opening 21 having a desired opening angle is formed with the chip part 121 of the halogen lamp 11 facing down. Thereby, the reflective film 20 is coated with a thickness in the range of 100 μm to 300 μm.

  Next, in FIG. 11C, the silicon caps 122 and 123 are removed. Thereby, the halogen lamp 11 with a reflecting film in which the photothermal opening 21 having a desired opening angle is formed is completed.

  The film thickness can be adjusted by adjusting the viscosity of the reflective film material placed in the liquid tank 100.

  In the case of this method, the dripping of the reflective film material after being pulled up from the liquid tank 100 is generated in the chip portion 121. For this reason, even when the halogen lamp 11 is immersed in the liquid tank 100 horizontally, the film thickness of the reflective film 20 in the longitudinal direction can be made uniform, and the labor involved in cutting a desired portion of the reflective film 20 can be reduced. be able to. Furthermore, the liquid tank 100 can be made shallow, and the reflective film material to be used can be reduced.

The block diagram for demonstrating one Embodiment of the light bulb type heater of this invention. The block diagram for magnifying and explaining a part of FIG. X-x 'sectional drawing of FIG. Sectional drawing which expands and shows the principal part of FIG. The block diagram for demonstrating the state which attached the nozzle | cap | die to FIG. Explanatory drawing explaining the relationship between the wavelength and spectral output at the time of sealing argon gas and nitrogen gas. Explanatory drawing for demonstrating the effect of a heat distribution characteristic and spectral characteristics at the time of changing the film thickness of a reflecting film. Explanatory drawing for demonstrating the spectral characteristics at the time of changing the film thickness of a reflecting film. Explanatory drawing for demonstrating the relationship of the radiation ratio with the opening angle at the time of changing the film thickness of a reflecting film. Explanatory drawing for demonstrating one Embodiment of the light bulb type heater manufacturing method of this invention. Explanatory drawing for demonstrating other embodiment of the light bulb type heater manufacturing method of this invention.

Explanation of symbols

11 Halogen lamp 12 Bulb 121 Tip portion 13 Filament 14 Anchor 151, 152 Sealed end portion 161, 162 Metal foil 171, 172 Inner lead wire 181, 182 Outer lead wire 20 Reflective film 21 Photothermal opening 100 Liquid bath

Claims (5)

In a bulb-type heater configured by sealing a radiation transmissive bulb, a refractory metal filament sealed in the bulb, and a halogen gas together with an inert gas,
Using a reflective film material mainly composed of alumina and silica on the outer surface of the bulb, a coating is applied in the major axis direction of the bulb so as to have a predetermined opening angle other than the photothermal opening, and the thickness of the coating is 100 μm or more. A light bulb type heater characterized by being 300 μm or less.   The light bulb type heater according to claim 1, wherein the inert gas sealed in the bulb is an argon (Al) gas.   The bulb-type heater according to claim 1, wherein the opening angle is in a range of 150 ° to 55 °. After sealing a radiation transmissive bulb, a refractory metal filament sealed in the bulb and a halogen gas together with an inert gas, both ends of the bulb are sealed with sealed ends to form a bulb-type heater. ,
A reflective film material mainly composed of alumina and silica previously melted from one sealed end to the other sealed end of the tubular heater is immersed in a liquid tank, and a predetermined time in the major axis direction is obtained. The pipe heater is pulled up to coat a reflective film having a thickness of 100 μm or more and 300 μm or less,
A light bulb shaped heater manufacturing method, wherein a photothermal opening is formed by cutting the tube heater so as to have a specified opening angle in a major axis direction of the tube heater. After sealing a radiation transmissive bulb, a refractory metal filament sealed in the bulb and a halogen gas together with an inert gas, both ends of the bulb are sealed with sealed ends to form a bulb-type heater. ,
A reflective film material mainly composed of alumina and silica previously melted from the tip portion formed in the bulb by covering the sealed ends of the tube heater with caps and sealing each gas after sealing. Immerse it in a liquid tank, and take up a predetermined time to pull up the tubular heater to coat a reflective film having a thickness of 100 μm or more and 300 μm or less,
A light bulb shaped heater manufacturing method, wherein a photothermal opening is formed by cutting the tube heater so as to have a specified opening angle in a major axis direction of the tube heater.

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