JPH0559055B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for manufacturing a thermos flask used for keeping liquids and the like warm.

Conventional structure and its problems Thermos flasks are used to prevent temperature changes in water or liquid nitrogen by filling them with water or liquid nitrogen and blocking heat conduction and radiation from the outside or inside. It is widely used for household and industrial purposes as a simple device.

In recent years, measuring the characteristics of semiconductor materials and semiconductor devices in a low-temperature atmosphere such as liquid nitrogen or liquid helium has become important in understanding the unique properties of these semiconductor materials and semiconductor devices. These measurements are often performed by placing liquid nitrogen or liquid helium in a thermos flask, immersing a semiconductor material or semiconductor element sample in the thermos, and irradiating the sample with laser light or the like from the outside. Therefore, the thermos used in this case must have a window through which light such as a laser beam enters, and a window through which light emitted from the sample can be taken out from any angle. It is also desirable to have a vertical window that allows the amount of liquid nitrogen or liquid helium contained in the container to be determined from the outside.

As described above, a simple method for manufacturing a thermos flask that allows light to enter from the outside and allows the amount of liquid contained inside the flask to be determined has not been devised so far.

Purpose of the invention The present invention enables light irradiation from the outside, and
The purpose is to provide a simple method for manufacturing a thermos flask that allows the amount of liquid inside to be identified.

Structure of the Invention In order to achieve the above object, an electroless plating method is employed, in which a cylindrical inner container and an outer container are fused to each other at their upper ends to form a cavity, and the outer container has openings in the bottom and upper side surfaces. The container is held vertically and a liquid protective film-forming substance is injected into the gap from the opening at the bottom to form a non-plated part on the inner surface of the lower part of the container. a step of attaching a film; and a step of forming a first metal plating region on the side surface of the container by holding the container in a horizontal state and injecting an electroless plating solution into the gap through the opening in the upper side surface. Then, rotate the container horizontally so that the first metal plating area faces upward, and inject the electroless plating liquid into the gap between the container and the first metal plating area parallel to the cylindrical axis. forming a second metal plating area to provide a striped non-plated area; and after removing the protective film, holding the container in a vertical position and applying electroless metal plating to the cavity from the opening in the bottom. The method for manufacturing a thermos bottle comprises the step of injecting a plating liquid to form a third metal plating area so as to provide a ring-shaped non-plating area between the lower portions of the first and second metal plating areas. .

With this configuration, the amount of liquid inside can be identified through the window as the striped non-plated area, and light can be incident from between the metal-plated area on the bottom and the metal-plated area on the side. It can be easily manufactured.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a cross-sectional view of a thermos bottle 1 immediately before silver mirror plating in one embodiment of the present invention. A cylindrical inner glass container 2 and a cylindrical outer glass container 3 are fused to each other at their upper ends, and the outer glass container 3 has a first aperture 4 and a second aperture in the bottom and upper sides, respectively. 5 is provided.
The inner diameter of the inner glass container 2 is 8 cm, and the outer diameter and length of the outer glass container 3 are 10 cm and 75 cm, respectively.
After the silver mirror plating is completed, the first and second openings 4 and 5 are opened to the inner glass container 2 and the outer glass container 3.
The gap 6 between the two is sealed in a vacuum state.

FIG. 2 shows a cross-sectional view of the bottle 1 after silver mirror plating. Silver mirror plating is applied to the inner surfaces of the inner glass container 2 and outer glass container 3 that are in contact with the cavity 6. Silver mirror plating areas 7, 8, and 9 are formed. FIG. 3 is a front view of the bottle 1 after silver mirror plating, and there are two striped non-plated areas 10 parallel to the axes of the glass containers 2 and 3 on the side surface of the inner glass container 2 and two on the outer glass container. Two of them are provided vertically on the side of the 3, both at symmetrical positions with respect to the axis. In addition, a ring-shaped non-plated area 1
1 is provided at the same height as the inner glass container 2 and the outer glass container 3. The manufacturing process of such a thermos flask with silver mirror plating will be explained based on FIGS. 4 to 10.

(1) First, after cleaning bottle 1 with a 23% hydrofluoric acid aqueous solution,
Perform pure water cleaning and alcohol cleaning. It is dried by irradiating it with an infrared lamp while drawing it through the first opening 4 with a suction pump. (Fig. 4) (2) Hold the bottle 1 vertically and open the second opening 5.
Attach a vinyl hose to the first opening 4, attach a funnel 12 to the tip of the hose, and pour in a 10% trichlorethylene solution 13 under the trade name Picein (petroleum pitch) while sucking up the water with a suction pump. When the liquid level reaches 12 cm from the bottom, the injection is stopped and the trichlorethylene solution is discharged from the first opening 4. Next, it is dried by infrared irradiation while being pulled through the first opening 4 with a suction pump. In this way, the picane membrane 14 is provided at the bottom of the bottle 1. (Figure 5) (3) Prepare the silver plating solution in advance and store it in the refrigerator. For silver mirror plating solution, prepare A solution and B solution separately. Solution A is silver nitrate in 900ml of water.
Dissolve 30g of AgNO3 and pour 28% ammonia water NH4OH into it until the silver oxide precipitate that has formed is redissolved. Also, liquid B is boiled water
Dissolve 20g of silver nitrate in 500ml, add 16.6g of Rothsiel's salt, and boil for a while.
Make it by suction filtration immediately.

(4) Turn the bottle 1 provided with the picane membrane 14 on its side and place it horizontally. From the first opening 4, liquid A 15 and liquid B 16 of the silver mirror plating liquid are cooled in the refrigerator.
Mix equal amounts and pour slowly using funnel 12. A to a position 4 mm below the center axis of bottle 1
When liquid 15 and liquid B 16 are filled, stop pouring and let stand for 30 minutes. In this way, a first silver plating area 7 is formed approximately on the lower half of the side surface of the bottle 1. Take out liquid A 15 and liquid B 16 in bottle 1. (Figure 6) (5) Rotate the bottle 1 180 degrees about its axis so that the first silver plating area 7 of the bottle 1 is directly above it,
Place it horizontally again. Add liquid A15 in the same manner as in the previous section (4).
By slowly mixing equal amounts of liquid B 16 and the first silver plating area 7, two stripe-shaped non-plating areas 10 with a width of 8 mm are created in each of the inner glass container 2 and the outer glass container 3. Pour until it reaches the desired position. At this time, the first silver plating area 7 is
In order to prevent the
Ventilate by blowing air in. In this way, the second silver plating area 8 is formed. (Figure 7) (6) Dissolve the picein membrane 14 in trichlorethylene and wash with alcohol and pure water. If the picane film 14 remains, the silver plating area will not be covered in the next step of plating, so it is completely removed.
(Fig. 8) (7) Hold the bottle 1 vertically and pour liquid A 15 and liquid B 16 through the bottom opening 4 through the vinyl hose. Stop pouring when the liquid level reaches a height of 15 mm below the first and second silver plating areas 7 and 8. Fix the vinyl hose vertically and let it stand for 30 minutes so that the plating liquid in bottle 1 does not move. At this time, in order to prevent the first and second silver plating areas 7 and 8 from being damaged by the ammonia emitted from the plating solution, the vinyl hose is inserted through the second opening 5 so that its tip is exposed to the plating solution. Insert it until it reaches 5 cm above the surface and blow air to prevent ammonia from staying at the top of the plating solution. (Figure 9) (8) Take out the plating solution, wash it with pure water, and dry it by irradiating it with an infrared lamp while drawing a vacuum.

(9) Vacuum the cavity 6 and seal the first and second openings 4 and 5. (Figure 10) As described above, according to this embodiment, the amount of liquid in the thermos can be determined by the process of applying the picane film once and the process of applying silver mirror plating three times. a striped window 10 with a width of 8 mm for
A thermos flask equipped with a ring-shaped window 11 with a height of 15 mm for irradiating a sample placed in this liquid with light from the outside was easily manufactured using simple equipment.

Although this example shows a case where silver mirror plating is applied to a glass container, it is not limited to silver mirror plating, and other electroless plating may be performed. A container made of an insulator may also be used.

Further, in this example, a trichlorethylene solution of picein was used, but a solution of the resin dissolved in an organic solvent may also be used. Although air was blown for ventilation, an inert gas may also be used.

Effects of the Invention As described above, according to the present invention, through one protective film deposition process and three electroless plating processes,
A window for distinguishing the amount of liquid in a thermos flask and a ring-shaped window are created by forming a metal coating on the inner surface of the container except for a vertical stripe-shaped non-plated area and a ring-shaped non-plated area. A thermos flask having the above can be easily manufactured by using simple equipment. Furthermore, even if the shape of the container is complex, it is processed in both horizontal and vertical positions, so it is not affected at all and is highly effective.

[Brief explanation of the drawing]

Figure 1 is a sectional view of a bottle before silver mirror plating in one embodiment of the present invention, Figure 2 is a sectional view of the bottle after silver mirror plating, Figure 3 is a side view of the same, and Figures 4 to 10.
The figure is an explanatory diagram for explaining the manufacturing process in the same example. DESCRIPTION OF SYMBOLS 1...Bottle, 2...Inner glass container, 3...Outer glass container, 4...First opening, 5...Second opening, 6...Gap, 7...First 8...Second metal plating area, 9...Third metal plating area, 10...Striped non-plating area, 11...Ring-shaped non-plating area.

Claims (1)

[Scope of Claims] 1. A cylindrical inner container and an outer container are fused together at their upper ends to form a gap, and the outer container has openings at the bottom and upper sides for electroless plating. Using a container, the container is held in a vertical position and a liquid protective film forming substance is injected into the gap through the opening at the bottom to adhere the protective film to the lower inner surface of the container to form an unplated part. a step of holding the container in a horizontal state and injecting an electroless plating solution into the gap through the opening in the upper side surface to form a first metal plating region on the side surface of the container; is rotated horizontally so that the first metal plating area faces upward, and an electroless plating solution is injected into the cavity to form a stripe-like structure parallel to the cylinder axis between the first metal plating area and the first metal plating area. forming a second metal plating region to provide a non-plated region;
After removing the protective film, the container is held in a vertical position and an electroless plating solution is injected into the gap through the opening in the bottom to form a space between the lower parts of the first and second metal plating areas. A method for manufacturing a thermos flask, comprising the step of forming a third metal plating area so as to provide a ring-shaped non-plating area. 2 As an electroless plating solution, a first solution consisting of a mixture of 3 to 4% silver nitrate aqueous solution and 28% aqueous ammonia, 3 to 4% silver nitrate, and 3 to 4% Rothsiel salt.
The method for manufacturing a thermos flask according to claim 1, using a mixture of equal amounts with a second solution consisting of an aqueous solution of 10%. 3. The method for manufacturing a thermos flask according to claim 1, wherein a solution of a resin dissolved in an organic solvent is used as the liquid protective film-forming substance for forming the non-plated portion. 4. The method for manufacturing a thermos flask according to claim 1, wherein a solution of petroleum pitch dissolved in an organic solvent is used as the liquid protective film-forming substance for forming the non-plated portion. 5. The method for manufacturing a thermos flask according to claim 1, wherein in the step of forming the second or third metal plating region, air or inert gas is blown into the portion into which the electroless plating solution is injected.