JPH036282Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to the mouth structure of a metal double container such as a metal thermos flask, in which a stainless steel inner cylinder and a metal outer cylinder are integrally joined at the mouth. .

(Prior art) Conventional metal thermos flasks have been widely used as portable thermos flasks, etc., but in order to improve their impact resistance or design, metal inner cylinders and metal outer cylinders were used. A metal double-bottle bottle made by integrally joining a cylinder at the mouth part is housed in an exterior case made of synthetic resin, etc., and Japanese Utility Model Publication No. 57-3566 describes a metal double-bottle bottle made from the mouth part to the shoulder part. It has been proposed to cover the vicinity with a shoulder member made of synthetic resin. Recently, instead of using stainless steel for both the metal inner cylinder and the metal outer cylinder, a system has been developed in which the metal inner cylinder is made of stainless steel and the metal outer cylinder is made of comparatively inexpensive carbon steel, which are joined and integrated.

By the way, especially in metal double-bottom bottles that use dissimilar metals for the inner and outer cylinders, such as iron for the outer cylinder and stainless steel for the inner cylinder, there is a difference between the mouth of the metal double-bottom bottle and the mouth of the outer case or shoulder member. When injecting and dispensing the contents,
They must be integrated in a watertight manner to prevent the contents from entering the gap between the metal double bottle and the outer case or shoulder member.

For this reason, conventionally, as shown in Fig. 3, the inner cylinder 1
The joint part 4 of the metal double-bottomed bottle 3 is made by welding or brazing the mouth parts 1a and 2a of the outer cylinder 2 and the outer cylinder 2 into one body by welding or brazing. mouth part 5 of 5
A gasket 6 was disposed as a separate part between it and a to provide a watertight seal. In addition, Japanese Utility Model Application Publication No. 59-77939 proposes a device in which a gasket is provided to clamp the joint, and furthermore, Japanese Utility Model Application Publication No. 61-14937 proposes a device in which an enamel layer is provided at the joint. has been done.

(Problem to be solved by the invention) However, it is difficult to completely protect the joint 4 from contact by painting or plating in the conventional mouth structure, and even if a jig is used, the The inner surface of the metal inner cylinder 1 is also treated, causing hygiene problems. Furthermore, when a separate packing 6 is provided due to errors in the shape and dimensions of the joint 4, there are problems such as poor watertightness and damage to the packing itself.

Furthermore, the joints 4 of the metal double bottle 3 are susceptible to rust due to heat effects such as welding, or due to local battery action due to the joining of dissimilar metals, and water tightness around the joints 4 of the metal double bottle 3 is likely to occur. It is desired to further improve performance. Further, in the prior art, the enamel layer is not easy to manufacture due to poor adhesion, and there are concerns about cracking.

The present invention was made in view of the above circumstances, and aims to improve the watertight performance of the joint 4 of the metal double bottle 3, improve quality, and facilitate its manufacture. .

(Means for solving the problem)) Next, the first means for solving the problem is described below.
This will be explained based on FIGS.

Silicone rubber or fluorine rubber is applied to the joint 14 of the metal double bottle 13, which is a metal container such as a metal thermos flask, which is integrated with the mouth 11a of the stainless steel inner cylinder 11 and the mouth 12a of the metal outer cylinder 12. A dip forming layer 15 is provided.

(Function) The joint 14 between the mouth 11a of the stainless steel inner cylinder 11 and the mouth 12a of the metal outer cylinder 12 is kept watertight by the dip forming layer 15 made of silicone rubber or fluorine rubber.

(Embodiment) FIGS. 1 and 2 show an embodiment of the present invention, in which a metal thermos flask 10 is a metal container consisting of a stainless steel inner cylinder 11 and a metal outer cylinder 12. The double bottle 13 is housed in an exterior case 16 made of synthetic resin or the like. The metal outer cylinder 12 is made of carbon steel, and the stainless steel inner cylinder 11 and the metal outer cylinder 12 are integrally joined at their openings 11a and 12a by welding means such as brazing, seam welding, and Teig welding. A metal double bottle 13 is formed. And the joint 14 of this metal double bottle 13
A dip forming layer 15 made of silicone rubber or fluorine rubber is provided on the bottom. This dip molding layer 15
As shown in FIG. 2, the metal double bottle 13 is hung on the conveyor 17 with the joint 14 facing downward, and the metal double bottle 13 is raised and lowered to place the joint 14 in the tank 18a of the primer liquid 18. Immerse it from the end to the specified position.

This step of applying the primer liquid 18 provides an undercoat to increase the adhesion of the dip forming layer 15, which will be described later, and may be treated as necessary. Next, the liquid resin 19 made of silicone rubber or fluoro rubber is poured into the joint 1 in the tank 19a.
By this step, the liquid resin 19 having a certain degree of viscosity adheres almost uniformly to the joint portion 14 regardless of its shape.

This thickness can be adjusted by adjusting the dipping time, pulling speed, etc., and if thick treatment is required, the metal double bottle 13 is heated in advance. Finally, a heating furnace 20a with a heater 20 installed and maintained at approximately 150 to 200℃
Put the metal double bottle 13 into the container and pour the liquid resin 19 into the container.
is cured, and the dip forming layer 15 is provided. Furthermore, by increasing the thickness of the dip forming layer 15 to some extent, the elasticity of the dip forming layer 15 can be improved.

The outer case 16 is fitted onto the outside of the joint 14 in which the dip forming layer 15 is provided. This installation is done by screwing and tightening the tightening member 21 provided at the center of the bottom member 16a of the outer case 16 and pushing up the metal double bottle 13, so that the dip molding layer 15 is attached to the outer case 16. It fits into the mouth portion 16b. Furthermore, the opening 16b of the outer case 16 is closed by an inner plug 22 that is screwed together.
On the other hand, an outer cap-shaped cap 23 is screwed into the case shoulder portion 16c of the outer case 16.

Next, the operation of the above structure will be explained.

When injecting or dispensing the contents, remove the outer cap 23 and then loosen the inner stopper 22. At this time, the inner liquid comes into contact with the dip forming layer 15, but since the dip forming layer 15 is attached around the joint portion 14 and to the horizontal bent portion 11b of the stainless steel inner cylinder 11, the watertight performance can be improved.

As described above, the present invention does not require many jigs unlike painting, plating, etc. by providing the dip forming layer 15 on the joint 14, and also coats unnecessary parts such as the inner surface of the stainless steel inner cylinder 11. There is no risk of intrusion of the plating liquid or plating liquid, and the metal double bottle 13 can be provided only at a predetermined location of the metal double bottle 13, and the metal double bottle 13 can be improved in watertight performance and contact resistance, and is sanitary.

Furthermore, by using silicone rubber or fluorocarbon rubber as the material for the dip molding layer 15, safety is excellent, and since the dip molding layer 15 has elasticity, there is no need to newly install highly accurate packing, and the manufacturing process is simplified. It can be simplified, and dimensional errors and poor fitting can be eliminated.

Moreover, in the dip molding of silicone rubber or fluorocarbon rubber, since the silicone rubber or fluorocarbon rubber has a predetermined viscosity during molding, it tends to adhere easily, and the dip molding can be performed easily and reliably.

(Effect of the invention) The spout structure of the metal container of the present invention having the configuration described in detail above is a metal container such as a metal thermos flask, etc., in which the spout of the stainless steel inner cylinder and the mouth of the metal outer cylinder are joined and integrated. This method attaches a dip molding layer made of highly safe silicone rubber or fluorocarbon rubber to the joints of containers, making the joints more hygienic and improving watertightness and corrosion resistance compared to conventional technology. Moreover, the manufacturing can be carried out reliably and easily.

[Brief explanation of the drawing]

Figures 1 and 2 show one embodiment of the present invention; Figure 1 is a longitudinal cross-sectional view of a metal thermos flask according to the present invention, Figure 2 is a cross-sectional view showing the manufacturing process, and Figure 3 is a cross-sectional view showing the manufacturing process. It is a half-cut sectional view of a conventional example. 11...Stainless steel inner cylinder, 12...Metal outer cylinder, 14...Joint part, 15...Dip molding layer.

Claims (1)

[Scope of utility model registration request] A dip molding layer made of silicone rubber or fluorocarbon rubber is attached to the joint of a metal container such as a metal thermos flask, in which the mouth of a stainless steel inner cylinder and the mouth of a metal outer cylinder are joined and integrated. The mouth structure of a double metal container.