JPH0747078Y2 - Vacuum insulation container made of synthetic resin - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum heat insulation container used as a thermos bottle, a heat insulation lunch box, or the like.

[0002]

2. Description of the Related Art Conventionally, a vacuum metal heat insulating container made of glass or stainless steel has been used as a thermos bottle, a heat retention lunch box or the like.

These glass or metal vacuum heat insulating containers consist of an outer container, an inner container and a space between them, and the space is evacuated to form a vacuum heat insulating layer. It is excellent and can maintain a high vacuum state for a long time, but it is inconvenient to carry because the shape and design are restricted in manufacturing and the product is heavy.

Therefore, a vacuum heat insulating container using a synthetic resin, which is easy to mold and lightweight, has been proposed instead of glass or metal. This has a structure similar to that of glass or metal, and in its manufacture, a plating layer for the purpose of maintaining a vacuum by increasing the gas barrier property on the surface facing the vacuum heat insulating layer between the inner and outer containers. The method of forming is taken. Since this plating layer is formed by a combination of chemical plating and metal plating, it also has the effect of reducing heat loss due to radiation. A low melting point solder is used for joining in order to metallize the joining portion. As described above, by metallizing the surface of the inner and outer containers facing the vacuum heat insulating layer and the joint, deterioration of the vacuum degree of the vacuum heat insulating layer can be prevented, and the performance as the vacuum heat insulating container can be maintained for a long time. I have to.

However, the inner and outer containers made of synthetic resin are often formed by injection molding. In that case,
In such injection molding, a gate portion for pouring the synthetic resin is generated. Then, a small protrusion is inevitably generated on this gate portion, and residual strain is left on the protrusion depending on the position of the gate portion, and the plating layer is peeled off or swollen due to heat cycle or the like in the gate portion and the peripheral portion of the gate surrounding the gate portion. Etc., it was found that the adhesion of plating was reduced and plating defects such as non-plated parts occurred.
Due to this, there is an inconvenience that the gas barrier property of the vacuum heat insulating container cannot be maintained. For this reason, the gate part of injection molding usually has to be placed at a position where it does not become inconvenient for the gas barrier property of the container, and the free shape of the product,
It limits the design. A molding method that does not require a gate portion, such as a vacuum molding method, is also conceivable, but mass productivity and dimensional accuracy are poor, and the shape and design are more restricted than those of injection molding.

[0006]

SUMMARY OF THE INVENTION Therefore, the problem to be solved by the present invention is to prevent deterioration of plating adhesion and plating defects such as non-plated portions on the surface of the gate portion in the injection molding of synthetic resin. It is to provide a synthetic resin vacuum heat insulation container having a high degree of freedom in shape and design.

[0007]

This problem has been solved by coating the surface of the gate portion of the outer or inner container made of synthetic resin with a solder from above the plating layer in the vacuum insulating container made of synthetic resin. It is a thing.

[0008]

The vacuum insulation container made of synthetic resin of the present invention is such that the surface of the gate portion of the outer container or the inner container made of synthetic resin is covered with solder from above the plating layer, and the surface of the gate portion is completely made of metal. Since it is covered with, the adhesion of plating is not deteriorated at the gate portion and plating defects such as non-plated portion do not occur, and it has a perfect gas barrier property and can maintain a vacuum state for a long time. Therefore, there is no problem in the vacuum maintaining performance of the heat insulating container in the gate portion generated during the injection molding and the gate peripheral portion of the portion surrounding the gate portion.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to FIGS. 1 is a vertical sectional view showing an embodiment of the present invention, FIG. 2 is an enlarged vertical sectional view of an outer container of FIG. 1, FIG. 3 is a vertical sectional view of an inner container, and FIG. 4 is a vertical sectional view of an outer container. It is shown.

In FIG. 1, reference numeral 1 is an inner container, and reference numeral 2 is an outer container. The inner container 1 and the outer container 2 are joined and integrated at their mouths 1A and 2A, respectively, to form a double-walled container with a space 3 therebetween.

The inner container 1 is injection-molded from a plating grade ABS resin and has a U-shaped cross-section in the vertical direction, and a collar portion 1B projecting annularly is formed outside the mouth portion 1A. . At the center of the bottom of the wall surface facing the space 3 of the inner container 1, there is a gate portion 4 which is formed by pouring a synthetic resin when the inner container 1 is injection-molded. The position where the gate portion 4 is generated is not necessarily the center of the bottom of the wall surface facing the space 3 of the inner container 1, but differs depending on the position of the nozzle of the injection molding machine when the inner container 1 is injection molded.

The chemical plating layer 5 has a thickness of about 0.8 to 1.0 μm on the joint surface 1C of the inner and outer container 1 with the outer container 2 and on the wall surface of the inner container 1 facing the space 3. Formed by
Using this as a conductor, a bright electrolytic copper plating layer 6 to be electroplated is further formed on the upper surface with a thickness within the range of 10 to 20 μm. The surface around the gate portion 4 of the inner container 1 and the portion surrounding the gate portion 4 is completely covered with a low melting point solder 7 on the bright electrolytic copper plating layer 6.

Like the inner container 1, the outer container 2 is injection-molded with a plating grade ABS resin, has a collar 2B protruding annularly on the outside of the mouth 2A, and an exhaust opening at the bottom. 8 is formed. The sealing surface 2D at the outer bottom of the outer container 2 has gate portions 9 and 9'generated when the outer container 2 is injection-molded. The position where the gate portions 9 and 9'are generated is not necessarily the sealing surface 2D of the outer bottom portion of the outer container 2, but differs depending on the position of the nozzle of the injection molding machine when the outer container 2 is injection molded.

On the joint surface 2C of the outer container 2 with the inner container 1,
A chemical plating layer 5 having a thickness of about 0.8 to 1.0 μm is formed on the wall surface of the outer container 2 facing the space 3 and on the sealing surface 2D, and this is used as a conductor. A bright electroplated copper layer 6 to be electroplated on the upper surface is formed with a thickness within the range of 10 to 20 μm, and this laminated state is shown in FIG.

The gate portions 9 and 9'of the outer container 2 and the surface around the gate portions surrounding them are completely covered with a low melting point solder 10 from above the bright electrolytic copper plating layer 6 and the low melting point. The sealing plate 11 that seals the exhaust opening 8 and the sealing surface 2D are joined by the solder 10. The sealing plate 11 is a metal sealing plate or the inner and outer containers 1,
It is made of a synthetic resin sealing plate which is plated in the same manner as 2.
The joint surface 1C of the inner container 1 and the joint surface 2C of the outer container 2 are joined by a low melting point solder 12.

Next, a method for manufacturing the synthetic resin vacuum heat insulating container of the above embodiment will be described. First, an inner container 1 having a collar portion 1B made of a plating grade synthetic resin, and a collar portion 2
The outer container 2 having B and the exhaust opening 8 is manufactured by the injection molding method. In the case of this example, the gate portion 4 for pouring the synthetic resin of the inner container 1 is formed at the center of the bottom outer side, and the gate portions 9 and 9 ′ of the outer container 2 are formed on the sealing surface 2D. Then, a chemical plating layer 5 is formed on the joint surface 1C of the inner and outer containers 1 with the outer container 2 and on the wall surface of the inner container 1 facing the space 3, and a bright electrolytic copper plating layer 6 is formed on the upper surface of the chemical plating layer 5. To form.

Then, the periphery of the gate portion 4 and the portion surrounding the gate portion 4 is completely covered with the low melting point solder 7 on the bright electrolytic copper plating layer 6. Then,
A chemical plating layer 5 is formed on the joint surface 2C of the outer container 2 with the inner container 1, on the wall surface of the outer container 2 facing the space 3, and on the sealing surface 2D, and the upper surface is glossy. The electrolytic copper plating layer 6 is formed.

After this, the joint surface 1C of the inner container 1 and the outer container 2
The joint surface 2C of 1 is joined and integrated with the low melting point solder 12 to form a double-structured body. Then, after the sealing plate 11 is held outside the exhaust opening 8 at the bottom of the outer container 2 and the space 3 is evacuated, the gate parts 9 and 9'of the outer container 2 and these The low-melting-point solder 1 on the surface around the gate part of the part surrounding the
While completely covering with 0, the sealing plate 11 is fixed to the sealing surface 2D and the space 3 is vacuum-sealed to form a vacuum heat insulating layer. It should be noted that the sealing plate 11 is made of metal or is made of synthetic resin which is plated in advance in the same manner as the inner and outer containers 1 and 2 so that a space between the inner container 1 and the outer container 2 can be formed with low melting point solder. The part 3 can be hermetically sealed.

In the synthetic resin vacuum heat insulating container of the above-mentioned embodiment, the surfaces around the gate parts 4, 9, 9'and the gate parts surrounding them generated during the injection molding of the synthetic resin inner and outer containers have a glossy electric property. Since the copper plating layer 6 is covered with the low melting point solders 9 and 10, the effect of reducing the heat loss due to radiation is equivalent to that of the vacuum insulating container made of metal.
There is no deterioration of plating adhesion at the gate part or plating defects such as non-plated part, it has a more complete gas barrier property, prevents vacuum deterioration of the vacuum heat insulation layer due to outgas, and improves the performance as a heat insulation container. It can be maintained for a long time. Further, since the position of the gate portion is not restricted as compared with the conventional vacuum heat insulating container made of synthetic resin, and the molding is easier than that of the metal vacuum heat insulating container, the degree of freedom in shape and design is large. Further, it is very lightweight compared to a metal vacuum heat insulating container, which makes it convenient to carry.

Next, a concrete example of the synthetic resin vacuum heat insulating container of the present invention as shown in FIG. 1 will be described in detail. Example 1 First, an inner container 1 having a collar portion 1B and an outer container 2 having a collar portion 2B and an exhaust opening 8 were formed by injection molding using a plating grade ABS resin. Then, in order to impart conductivity, the joint surface 1 of the inner and outer container 1 with the outer container 2
Chemical nickel plating was formed on the surface of C and on the wall surface of the inner container 1 facing the space 3 to a thickness of about 1 μm, and bright electrolytic copper plating was formed on the upper surface of the thickness to about 15 μm.

Then, the surface of the gate portion 4 of the inner container 1 and the peripheral portion of the gate portion surrounding the gate portion 4 was completely covered with a low melting point solder 7 having a melting point of 95 ° C. on the bright electrolytic copper plating. Then, the joint surface 2C of the outer container 2 with the inner container 1
Above, on the wall surface of the outer container 2 facing the space 3, and the sealing surface 2
Chemical nickel plating with a thickness of about 1 μm is formed on D and
Further, a glossy electrolytic copper plating was formed on the upper surface to a thickness of about 15 μm. Then, a low melting point solder 12 similar to the above low melting point solder 7 is placed on the joint surface 2C of the outer container 2, the inner container 1 is placed thereon, and the joint portion is heated to 95 to 100 ° C. Was melted and the joint surface 1C of the inner container 1 and the joint surface 2C of the outer container 2 were joined and integrated to form a double-structured body. Then, the exhaust opening 8 at the bottom of the outer container 2
A copper sealing plate 11 having a thickness of 1 mm is held on the outside of the container, the space 3 is evacuated to 10 ^-5 Torr or less, and a low melting point solder 10 having a melting point of 95 ° C. is placed on the sealing surface 2D to form a gate of the outer container 2. After completely covering the surfaces of the parts 9 and 9 ′ and further mounting the sealing plate 11 thereon, the sealing part is heated to 95 to 100 ° C. to melt the low melting point solder, vacuum sealing and plating at the same time. A vacuum insulation container made of grade ABS resin was obtained.

Comparative Example 1 A plating grade ABS was prepared in the same manner as in Example 1 except that the surface of the gate portion was not covered with low melting point solder.
A resin vacuum insulation container was obtained.

Then, a comparative test of the heat insulating performance of the vacuum insulating container made of the plating grade ABS resin obtained as described above was conducted as follows. First, the gas barrier property of the plating layer formed on the inner container and the outer container of Comparative Example 1 formed of chemical nickel plating and bright electrolytic copper plating was measured by a helium permeation test. As a result, permeation of helium from the plating layer was observed in both the inner and outer containers. This is because the surfaces of the gate portions of the inner container and the outer container have plating defects.

Next, the gas barrier property of the plating layer of Example 1 was measured by a helium permeation test. As a result, no permeation of helium from the plating layer was observed in both the inner container and the outer container. Furthermore, ambient temperature -20
Adhesion between the plated layer and the low melting point solder was evaluated by a heat cycle test in which 10 cycles of 1 hour at ℃, 15 minutes at room temperature and 1 hour at 80 ° C. were repeated for 10 cycles. As a result, no abnormality was found in the gas barrier properties of both the inner container and the outer container, and the initial heat insulation performance was maintained even after the heat cycle test.

From the above test results, the gas barrier property of the synthetic resin container was perfected by completely covering the surface of the gate portion of the synthetic resin container with a low melting point solder on the bright electrolytic copper plating layer. I know you can get it.

[0026]

As described above, the synthetic resin vacuum heat insulating container of the present invention has a plating layer formed on the inner and outer container wall surfaces facing the vacuum heat insulating space between the inner and outer containers and the gate portion of the synthetic resin container. Since the surface of the is coated with solder from above the plating layer, the effect of reducing heat loss due to radiation is equivalent to that of a metal vacuum insulation container, and the adhesion of plating at the gate part is reduced and unplated parts, etc. It has a more complete gas barrier property without the occurrence of plating defects, prevents vacuum deterioration of the vacuum heat insulating layer due to outgas, and can maintain the performance as a heat insulating container for a long period of time.
In addition, compared to conventional vacuum insulation containers made of synthetic resin, there is no restriction on the position of the gate part, and since it is easier to mold than metal vacuum insulation containers, it has a high degree of freedom in shape and design. is there. Further, it is very lightweight compared to a metal vacuum heat insulating container, which makes it convenient to carry.

[Brief description of drawings]

1 is a vertical cross-sectional view showing an embodiment of a synthetic resin vacuum heat insulating container of the present invention.

FIG. 2 is an enlarged vertical sectional view of an outer container plating layer shown in FIG.

3 is a vertical cross-sectional view of the inner container shown in FIG.

FIG. 4 is a vertical cross-sectional view of the outer container shown in FIG.

[Explanation of symbols]

 1 inner container 1A mouth 2 outer container 2A mouth 3 space 4 gate 5 plating layer 6 plating 7 solder 9 gate 9'gate 10 solder 12 solder

Claims (1)

[Scope of utility model registration request] 1. A double-walled structure in which an inner container and an outer container, at least one of which is made of a synthetic resin, are joined and integrated at a mouth portion to form a double wall structure, and the space between the inner container and the outer container is evacuated to vacuum. In a synthetic resin vacuum heat insulating container formed with a heat insulating layer, a plating layer is formed on the inner and outer container wall surfaces facing the vacuum heat insulating space between the inner and outer containers, and the surface of the gate portion of the synthetic resin container is covered with the plating layer. A vacuum insulation container made of synthetic resin, which is covered with solder from above.