JPS6343087B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vacuum container made of synthetic resin used for vacuum bottles.

(Prior art) Conventional vacuum containers are made of glass or stainless steel, and although the former has good heat retention performance, there are problems in that it breaks easily and the shape of the container is restricted during manufacturing, making it difficult to design freely. Although there was no problem with cracking, it did have drawbacks such as being heavy and not suitable for portable use. For this reason, products made of synthetic resin (Special Publication No. 44-13349) and hard paper materials (Japanese Publication No.
51-32857) etc. were developed.

(Technical issues) However, they have inferior gas barrier properties compared to those made of glass or stainless steel, and because they cannot maintain a high degree of vacuum, they do not have sufficient heat retention, so they have not become widespread even today. In addition, conventional vacuum cleaners, including those made of glass, extract air through a very thin exhaust pipe, which not only prolongs the evacuation process but also makes it difficult to achieve a high degree of vacuum.

The present invention is intended to solve the above-mentioned drawbacks and problems, and its purpose is to mainly consist of a double container body made of a gas barrier synthetic resin.
Furthermore, by increasing the diameter of the air outlet, various shapes can be easily molded, and by increasing the size of the air outlet, vacuum can be drawn efficiently and it is easy to achieve a high degree of vacuum. To provide a practical heat-insulating container made of synthetic resin that is not difficult to maintain and has good heat-retaining performance.

(Technical Means) The purpose is to create a vacuum container that is made of a double container body 1 with gas barrier properties by molding synthetic resin, and has a space 4 with a required degree of vacuum between the outer bottle 2 and the inner bottle 3. A large diameter air outlet 6 is opened at the pressure-resistant bottom of the outer bottle 2, and a stopper 7 that closes the air outlet 6 is connected to a conductive shot ring 9 for inducing high frequency waves remaining between them. This is achieved by providing a synthetic resin film 8 on at least the outer surface of the inner bottle 3 and further providing a reflective film 5 on both bottles 2 and 3.

Therefore, various synthetic resins were tested in the research and development of the present invention, and the criteria for their suitability were set as follows.

(a) The gas permeability is zero or negligible; (b) It has the strength to withstand the specified degree of vacuum; (c) There is little gas generation from inside the material; (d) It has excellent heat and cold resistance; (e) Radiation efficiency (f) It is easy to form a reflective film, and (g) It has excellent moldability (productivity).

As a result of the tests, several synthetic resins were listed as suitable, among which polycarbonate was found to be suitable as described below.

In addition, since this type of vacuum container is intended for portability, it must be lightweight, but this can be achieved by incorporating a reflective surface formed on the surface of the main material and a multi-layered synthetic resin film. , it has become possible to achieve a balance between improved gas barrier properties and weight reduction.

(Example) Next, an example of the present invention will be described with reference to the drawings.
FIG. 1 shows a synthetic resin vacuum container according to the present invention in a completed state, in which 1 is a synthetic resin container body consisting of an outer bottle 2 and an inner bottle 3; Both are molded from synthetic resin with gas barrier properties. As for the material,
It has heat resistance well over at least 100℃,
It is necessary to have good mechanical strength, impact resistance, and dimensional stability. The above-mentioned polycarbonate is used as a material having these properties and being moldable. In addition to meeting all of the above requirements, polycarbonate has a thermal conductivity that is comparable to that of glass.
23×10 ^-4 cal/sec/cm ² /℃/cm, stainless steel
595×10 ^-4 cal/sec/cm ² /℃/cm, 4.6×
Because it is extremely small at 10 ^-4 cal/sec/cm ² /°C/cm, it has the advantage of little heat loss and good heat and cold retention. Both bottles 2 and 3 are coated with an acrylic resin film 8 on opposite sides of the main material layer made of polycarbonate, and the high transparency of acrylic increases the transmission efficiency, which in turn improves the reflection efficiency, and at the same time improves gas barrier properties. can be increased. 5 is a resin film 8
An Al (aluminum) film is formed by vapor deposition on the opposing surfaces of both bottles 2 and 3, that is, on the inner surface of the outer bottle 2 and the entire outer surface of the inner bottle 3. This reflective film 5 may be provided on the outer surface of the outer bottle 2 instead of on the inner surface. Reference numeral 6 denotes a large-diameter air exhaust port opened at the pressure-resistant bottom of the outer bottle 2, which is connected to a vacuum device when air is exhausted from the space 4 between the bottles 2 and 3.
In the case of the embodiment, the container body 1 has an internal capacity of 750 c.c., but the diameter of the air outlet 6 is 40 mm. This is significantly larger than the conventional drawing diameter, which was 8 mmφ. 7 is a polycarbonate bottom plate that closes the air outlet 6; 9 is a conductive high-frequency induction shot ring interposed between the closure 7 and the air outlet 6 to assist in fixation;
Reference numeral 10 denotes a shot ring similar to the above mentioned which is interposed at the joint between the outer bottle 2 and the inner bottle 3, and both remain in the container body 1. Reference numeral 11 indicates a joint flange of the medium bottle 3, and 12 indicates a wide mouth of the vacuum container of the present invention, which has a diameter approximately equal to the diameter of the medium bottle 3. In addition, on the top of the container body 1,
A spout member 15 layered with a heat insulating material 14 is attached to the threaded part 13 formed on the outer periphery of the mouth of the medium bottle 3, and the member 15 has a spout 16a serving as a spout 16, and a large diameter outer peripheral part 16b serving as a spout. A cap 17 is provided,
Furthermore, by attaching a hakama member 19 to the lower part of the main body using an engaging portion 18 molded on the circumferential side of the outer bottle 2, a movable bottle is formed. In addition, the outer periphery of the bottle is sometimes coated with an exterior material.

To manufacture the above vacuum container, a shot ring 10 is interposed between the flanges 11 of the outer bottle 2 and the inner bottle 3, which have been molded and have a reflective film 5 formed thereon, and the two bottles 2 and 3 are joined by high-frequency induction means. After integrating both bottles 2 and 3, the double container body 1 is connected to the suction flange of a vacuum device such as an oil diffusion type at the hole edge 6a of the air outlet 6, and assembled into the suction flange. The above-mentioned stopper cap 7 is set on the tip of the plunger, and air is discharged from the air outlet 6 to the vacuum suction device to create the required vacuum state (approximately 10 ^-5 torr) in the space 4 between the bottles 2 and 3. The plunger is operated to insert the shot ring 9 into the air outlet 6 of the outer bottle 2 in the vacuum, and the stopper lid 7 is welded and fixed by high-frequency induction work.

(Operation of the invention) According to the above structure, the inner bottle 3 and the outer bottle 2 are integrated at the upper flange 11, and the space 4 between them is evacuated to an extremely high level for a synthetic resin container. Because of this, it exhibits a high heat shielding effect against temperature differences inside and outside the bottle. At least the outer surface of the medium bottle 3 is covered with a synthetic resin film 8 and is provided with a reflective film 5, so the medium bottle 3 exhibits excellent gas barrier properties and an excellent reflection effect against radiant heat from inside. The outer bottle 2 blocks external disturbances and blocks air from entering from outside and radiation from inside and outside.

Further, since the air outlet 6 has a large diameter, the efficiency of evacuation in the manufacturing process is significantly improved. Generally, when the degree of vacuum is higher than 10 ^-3 torr, the effect of molecular movement of air appears and the efficiency decreases, but according to the present invention, a degree of vacuum of about 10 ^-5 torr can be obtained even on a mass production basis.

(Effects of the Invention) Therefore, according to the present invention, the container body 1 can be formed with a free design by molding synthetic resin, and the body 1 is evacuated by a vacuum device, and the inside of the device is evacuated. Since the air outlet 6 is closed with the cap lid 7 that is set in advance, the degree of vacuum of the container body 1 can be easily adjusted to the set value and the container can be sealed securely. On the other hand, since the container body 1 is formed by molding, it is easy to set the vacuum outlet, that is, the discharge port 6, to an appropriate diameter, and therefore the vacuum can be drawn efficiently and accurately, improving quality. In addition, since the vacuum container is made of resin-coated synthetic resin, it is light and hard to break. Especially when polycarbonate is used, it has sufficient heat resistance and low thermal conductivity, and has a heat retention effect comparable to that of glass. It has the characteristics that can be obtained.

[Brief explanation of the drawing]

The figure shows an embodiment of the synthetic resin vacuum container according to the present invention, and FIG. 1 is a partial cross-sectional view of the vacuum container;
FIG. 2 is a sectional view of essential parts, and FIG. 3 is a partial sectional view of a water bottle using the vacuum container of the present invention. 1...Container body, 2...Outer bottle, 3...Medium bottle, 4
...Space, 5...Reflection film, 6...Air outlet, 7
... Stopper lid, 8 ... Synthetic resin membrane.

Claims (1)

[Claims] 1. A vacuum container consisting of a double container body 1 having gas barrier properties by molding synthetic resin, and having a space 4 with a required degree of vacuum between an outer bottle 2 and an inner bottle 3. A large-diameter air outlet 6 is opened at the pressure-resistant bottom of the outer bottle 2, and a stopper 7 that closes the air outlet 6 is inserted through a conductive shot ring 9 for inducing high-frequency waves remaining between them. A synthetic resin vacuum container which is permanently fixed and is characterized in that a synthetic resin film 8 is provided on at least the outer surface of an inner bottle 3, and a reflective film 5 is provided on both bottles 2 and 3. 2. The synthetic resin vacuum container according to claim 1, wherein the synthetic resin is polycarbonate. 3. The synthetic resin vacuum container according to claim 2, wherein the synthetic resin membrane 8 is provided on both opposing sides of the outer bottle 2 and the inner bottle 3. 4. The synthetic resin vacuum container according to any one of claims 1 to 3, wherein the reflective film 5 is a vapor-deposited film of aluminum.