JPH0274223A - Manufacture of cooling-retaining or heat-retaining metallic doubled vessel - Google Patents

Abstract

PURPOSE:To reduce a proportion defective due to vacuum sealing by bonding sections between the end section of the shell section of an external vessel and the cover of the external vessel, or sections between the respective end sections of the mouth sections of the external vessel and an internal vessel, to each other to be wound to be bound with each other in vacuum, and by vacuum- sealing a space section. CONSTITUTION:When the space section 5 of a metallic doubled vessel consisting of an internal vessel 1 and an external vessel 2 is formed to be of vacuum, then sections between the end section of the shell section 2a of the external vessel 2 and the cover 2b of the external vessel 2, or the respective end sections of the mouth sections 3 of the external vessel 2 and the internal vessel 1 are bonded to each other to be wound to be bound with each other in vacuum, and the space section 5 is vacuum-sealed. As this result, a proportion defective due to the vacuum-sealing is reduced, and the nonuniformity of a quality on the surface of low temperature perfornance is reduced and mass-production can be contrived.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to improving the vacuum sealing method for double-walled metal containers for cold/heat insulation, and in particular, reduces the variation in quality in terms of heat retention performance. The present invention also relates to a vacuum sealing method that can be easily mass-produced.

(Prior art) Glass containers with a vacuum double structure have traditionally been used as cold/thermal containers such as thermos flasks, but in recent years stainless steel containers have been used due to their inferior mechanical impact resistance when dropped. A double metal container made of steel or titanium plates is used.

As a conventional technique for sealing the space between the inner container and the outer container of such double metal containers to a vacuum, for example, in a vacuum heating furnace, a sealing plate is soldered to an exhaust hole drilled in the bottom cover of the outer container. There are two methods: one method is to attach an exhaust pipe to the bottom cover, the other is to provide an exhaust pipe in the bottom cover and seal the end by welding and welding the end part.

FIG. 7 is a diagram illustrating the method of brazing the former sealing plate, which is currently widely used, and the inner container 1 and the outer container 2 are joined together near the opening 3 of both by brazing or welding. The double-walled container is heated to about 600° C. under a vacuum of about 10 ”” torr in a vacuum heating furnace 15 to perform a degassing treatment, and at the same time, the brazing material 17 placed around the periphery of the exhaust hole 16 is heated. A method of melting and brazing the sealing plate 18 to vacuum seal the space 5 of the double-walled container is shown.

[Problem to be solved by the invention]

By the way, in this method of vacuum sealing by brazing, the melting temperature of the brazing material 17 is relatively high;
In addition, brazing to obtain suitable fluidity or viscosity of the brazing material 17 is difficult to manage because the optimum temperature range is small, and furthermore, the wettability of the brazing material 17 with stainless steel plates etc. is poor. This causes various problems in manufacturing.

That is, since the melting temperature of the brazing material 17 is high, the plating metal such as silver or copper applied to the inner wall surface of the space 5 to improve heat retention performance is easily damaged, and the fluidity of the brazing material 17 is high. If too much, the brazing material 17 will escape to the surroundings, and if the fluidity is too low or the wettability is too low, problems such as difficulty in sealing the pores will occur, which will impair heat retention and airtightness. .

Therefore, even if various efforts are made, such as increasing the degree of vacuum in the vacuum heating furnace 15, it will not contribute much to reducing the defective rate of products caused by the brazing and brazing processes, and the product cost will become relatively high.
Furthermore, it may cause rapid deterioration over time in terms of heat retention performance.

The present invention solves the above-mentioned drawbacks of conventional metal double containers, reduces the defect rate caused by vacuum sealing, reduces quality variations in heat retention performance, and facilitates mass production. Provided is a method for manufacturing a double heat-insulating metal container.

(Means for Solving the Problems) The present inventors have studied various vacuum sealing methods that do not impair productivity and have high reliability, and have found that the outer container and the bottom lid of the outer container are sealed in a vacuum chamber. It has been discovered that a method of sealing both end faces of parts, etc. by seaming process is effective in suppressing quality variations in terms of airtightness and deterioration of cold/warm retention ability over time, and in constituting the present invention. It's arrived.

That is, the present invention provides a method for manufacturing a cold/warm storage container that evacuates the space of a metal double container consisting of an inner container and an outer container, in which the space between the end of the body of the outer container and the lid of the outer container is Or, a metal 2m for cold/thermal insulation, characterized in that the ends of the outer container and the inner container mouth are sealed together in a vacuum by sealing, and the space is vacuum-sealed. This is a method for manufacturing a container.

Next, the manufacturing method of the present invention will be explained in detail with reference to the drawings.

Fig. 1 is a vertical cross-sectional view of the main body part illustrating a double-walled metal container for cold/thermal insulation produced by the method of the present invention, and Fig. 2 is a vacuum sealing process performed in a vacuum in Fig. 1. FIG. 3 is an enlarged cross-sectional view of the seamed portion that has been stopped.

In the figure, 1 is an inner container, 2 is an outer container, and both are joined near the mouth 3 by welding, brazing, mojime, tightening, etc. to form a double-walled container. .

These inner and outer containers 1.2 are made of surface-treated steel sheets, such as nickel-plated steel sheets or tin-plated steel sheets, or stainless steel sheets or even titanium sheets, which are suitable for the usage conditions, but compared to the outer container 1, they are made of materials suitable for the usage conditions. It is desirable to use a highly corrosion-resistant metal such as a stainless steel plate or a titanium plate for the inner container 2, which requires corrosion resistance. It is important to install it on the side, that is, in a part that does not come into contact with the internal solution of drinks etc. Furthermore, if the durability and portability of the cold/heat insulating container are important, it is preferable to use a titanium plate having an II content and excellent corrosion resistance for the entire main body structure.

On the other hand, when the inner container 1 is used for purposes that are not to be used repeatedly, such as disposable, a surface-treated steel plate such as a nickel-plated steel plate may be used for the inner container 1.

Note that the inner container 1 and the outer container 2 have body parts 1a and 2a, canopy parts 1b and 2b, and bottom lid parts IC and 2, respectively.
It consists of three parts: c. Here, the body parts 1a and 2a are constructed by forming a cut plate into a cylindrical shape and joining both end surfaces thereof by a method such as welding. Each part except the bottom cover part 2c is pre-joined and integrated at the joining part 4 by seaming, brazing, welding, or other methods, but apart from the above-mentioned method, deep drawing is also performed. The body portion and the canopy portion or the bottom cover portion may be integrally molded by a method such as the above.

The present invention provides a method for evacuating the space 5 of the double-walled container constructed in this way and vacuum-sealing it in the vacuum sealing section 6. In order to improve this, for example, baking treatment for degassing the metal material, inclusion of getter material for gas adsorption, plating treatment of copper or silver, etc. on the inner wall surface constituting the space 5, and A single material such as aluminum foil, glass wool, or urethane, or the arrangement of a layer thereof, etc., is selected and implemented as appropriate depending on the material used for the main body and the joining method.

Note that the above-mentioned arrangement of aluminum foil, urethane, etc. can also be used as a spacer and a reinforcing member for maintaining the shape of the space 5 which is kept in a vacuum state.

Next, an example of a method of seaming in a vacuum will be described.

FIG. 3 is a cross-sectional view illustrating the shape of both ends of the body 2a and bottom lid 2C of the outer container 2 before seaming. In the figure, 2a is the body of the outer container 2, 2C is the bottom lid, 8 is the curled portion, and 9 is a sealing material such as rubber. Vacuum seaming process is performed on the body part 2a and the bottom cover part 2.
With the positional relationship of C as shown in Figure 3, the degree of vacuum is 10-3 to 1.
This is a method in which the curled portion 8 is placed in an O-4 torr vacuum chamber and sealed by folding and pressing the curled portion 8 into the outer wall side of the body portion 2a using a roll-shaped rotating jig, with consideration given to creating a high vacuum inside the chamber. Other than the above, this process is basically the same as the can body seaming process that has been conventionally performed in the field of beverage cans, food cans, and the like.

The feature of the present invention is to solve the various problems inherent in the conventional brazing method by applying this vacuum seaming method to the vacuum sealing technology for cold/thermal containers.

In the present invention, the vacuum sealing processing section 6 that performs vacuum sealing by seaming processing is limited to both ends of the body 2a and bottom cover section 2c of the outer carp container 2 illustrated in FIG. However, the lid may be either the M portion 2a or the canopy portion 2b, or even between the ends of the mouth portion 3 where the canopy portions 1b and 2b meet in FIG.

Note that, as illustrated in FIG. 1, seaming in the atmosphere can be appropriately used as a method for joining the joint portion 4.

FIG. 4 is a sectional view of a cold/warm storage container illustrating another embodiment of the present invention in which both ends of the body 2a and canopy 2b of the outer container 2 are vacuum-sealed.

In the figure, the canopy part 2b corresponds to the flange part of the inner container 1, is integral with the body part 1a and the bottom lid part 1c, and is formed by drawing like the outer container 2. Of course, even in the case of the same figure, the body 2a and canopy 2b of the outer container 2 to be vacuum seamed, that is, both ends of the flange of the inner container 1, are pre-processed into the shape as illustrated in FIG. ing. In the case of the cold/thermal insulating container illustrated in Fig. 4, the inner container 1
Since the opening can be made large, it can be said to be suitable for uses such as ice buckets.

FIG. 5 shows that an easy-open can M10 used for beverage cans such as coffee is attached to the mouth part 3 in the same manner as for beverage cans.
FIG. 2 is a diagram illustrating an application example of the present invention, which is a cold-insulating/thermal-insulating container attached by seaming when the contents are packed.

FIG. 6 is a plan view of the easy-open can M10 in FIG. 5.

In order to open such an easy-open can M10, the score 14 forming the opening 13 can be torn off by pulling up the handle 12 attached by the rivet processing 11.In addition, the opening of the can 110 can be prevented from getting dirty. In addition, for the purpose of improving heat retention, a stopper lid 7 made of plastic or the like as illustrated in FIG. 5 may be provided.

Beverage cans with such cold/thermal insulation ability can keep the contents, such as coffee, at a suitable temperature for about 10 hours after being removed from the cold/thermal storage of a vending machine, etc., and are used in a variety of leisure activities these days. It can be said that it is in line with the current trend.

As described above, the present invention also has the feature that it is easy to diversify the design.

The effects of the present invention will be explained in detail below with reference to Examples.

(Example) Plate thickness 0.3+nm(+) stainless steel plate (SUS 30
4), a double-walled container having approximately the same shape as that shown in Fig. 1 was manufactured by joining each part by welding except for the bottom cover 2c (inner volume: 600 nl, inner diameter of the inner container: 81 mm, outer diameter of the outer container). 98n+m, outer surface of inner container and inner surface of outer container are nickel plated + silver plated). Next, the heating temperature was 600°C.
After baking for about 0.5 hours under a vacuum level of 10-'torr, each end of the body 2a and the separately prepared bottom lid 2c of the double-walled container described above was baked in a vacuum tightening machine. Arrange the parts as shown in Figure 3 and apply 0-3torr.
The bottom cover part 1c was wound around the body part 2c in a vacuum to vacuum-seal the space part 5.

For comparison, as illustrated in FIG. 7, first, the bottom cover part 2c having the exhaust hole was joined to the body part 2a by welding, and then a baking treatment was performed under the same conditions as described above.
Next, a container having the same shape as the one described above was also prepared, in which a sealing plate was brazed in a vacuum of 10'-'torr using silver solder having a melting temperature of 650 to 700°C.

After conducting a leak test on each of the 50 cold/thermal insulating containers according to the present invention and comparative containers created in this way, they were subjected to aging deterioration acceleration treatment by immersing them in hot water at 50°C for 7 days, and then in hot water at 95°C. 600+aβ was injected into the inner container and sealed with a heat insulating stopper, and the temperature of the water was measured after 10 hours at a room temperature of 20°C. As a result of these tests, in the leak test, it was discovered that two of the comparative containers had poor airtightness due to soldering defects. In addition, regarding the heat retention performance of the containers other than these, that is, the hot water temperature, in the case of the containers according to the present invention, the average hot water temperature was 56°C, and the standard deviation was 0.4°C.

On the other hand, in the case of the comparative container, the average hot water temperature was 58°C, and the standard deviation was 3°1°C. That is, although the average hot water temperature of the containers according to the present invention is slightly inferior to that of the comparative containers, the variation in quality is much smaller, and there are no defective products.

(Effects of the Invention) The cold/thermal containers manufactured by the vacuum sealing method of the present invention have uniform quality, are homogeneous, and have an extremely low defective rate. Furthermore, it is easy to mass-produce, dramatically increasing productivity by more than 10 times compared to conventional soldering methods, etc., and it is also easy to diversify in terms of design such as shape.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a cold/thermal insulating container according to the manufacturing method of the present invention, and FIG. 2 is an enlarged cross-sectional view of the part of FIG. Figure 3 is a cross-sectional view of both ends of the body and bottom cover before seaming.
FIG. 4 is a vertical cross-sectional view of a cold/thermal container for explaining another embodiment of the manufacturing method of the present invention, and FIG. 5 is an example of an application of the cold/thermal container according to the manufacturing method of the present invention. FIG. 6 is a plan view of the easily open can lid shown in FIG. 5, and FIG. 7 is a cross-sectional view for explaining the conventional vacuum sealing method by soldering. l... Inner container, la... Body of inner container, 1b...
Canopy part of inner container, IC...Bottom cover part of inner container, 2...
Outer container, 2a... Body of outer container, 2b... Canopy part of outer container, 2C... Bottom lid part of outer container, 3... Mouth part, 4
... joint part, 5 ... space part, 6 ... vacuum seaming part, 7 ... stopper lid, 8 ... curled part, 9 ... sealing material, 10 ... easy opening Can lid, 11... Rivet processing, 12... Handle, 13... Opening, 14... Score, 15... Vacuum heating furnace, 16... Exhaust hole, 17
... wax material, 18... sealing plate. Agent: Patent attorney Masamitsu Akizawa and one other figure 4 2C 72 figure 7t'5 concave left figure 7

Claims (1)

[Claims] In the manufacture of cold/thermal containers that evacuate the space of a metal double container consisting of an inner container and an outer container, the space between the end of the body of the outer container and the lid of the outer container, or between the outer container and the outer container. A method for manufacturing a double-walled metal container for cold/heat insulation, characterized in that the ends of the mouth of the inner container are joined together by seaming in a vacuum, and the space is vacuum-sealed.