JPH03215218A - Manufacturing process of cooling vessel - Google Patents

Abstract

PURPOSE:To bond a vessel body and a sealing plug firmly by applying an ultraviolet radiation curing resin on at least one of a coolant injection port and the sealing plug to be inserted therein, fitting the sealing plug to the coolant injection port, curing the resin through irradiation of ultraviolet ray and bonding the sealing plug to the vessel body. CONSTITUTION:In a cooling vessel 10, a vessel body 11 is composed of a double structure of an external wall 12 and an internal wall 13. A coolant 1 is sealed into a space 14 between the internal and external walls 12, 13. After applying ultraviolet radiation curing adhesive 2A thinly on the internal periphery of the coolant injection port 16 provided on the bottom of 12 of the cooling vessel 10, the vessel body 11 and the same kind of plastic-made sealing plug 17 are fit into the coolant injection port 16. Then the ultraviolet radiation curing 2B is applied in a circular shape so as to cover the part where the sealing plug 17 and the vessel body contact with each other. Then the cooling vessel 10 is passed into a ultraviolet ray projector 20 to cure the ultraviolet radiation curing adhesive 2A, 2B. Then the cooling vessel 10 where the sealing plug 17 is bonded with ultraviolet radiation curing adhesive 2A, 2B has a rigidly and reliably sealed state.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a cooling container, and more particularly to a method for fixing a refrigerant sealing plug to a container body.

[Background Art] Conventionally, a cooling container in which a refrigerant such as water is sealed in a space between an outer wall and an inner wall constituting the container body has been proposed (Japanese Utility Model Application Publication No. 1983-3-5 79-80). etc).

By placing this cooling container in a refrigerator and freezing the refrigerant in the space, it is possible to cool drinks such as beer that have not yet been chilled and to keep chilled beer cold for a long time.

Such a cooling container is constructed by injecting a refrigerant into the space through a relatively large refrigerant inlet formed on the entire bottom of the outer wall, and then welding a sealing plug to the refrigerant inlet by heating, for example. It is manufactured by fixing the sealing plug to the refrigerant inlet using a special adhesive for plastics.

[Problems to be Solved by the Invention] In the conventional cooling container manufacturing method described above, the method of welding the sealing plug to the refrigerant inlet by heating has the following problems. In other words, ■Since both the container body and the sealing plug are melted, the appearance of the welded part becomes dirty.■If the thickness of the welded part is uneven without being melted uniformly, it may not follow the expansion and contraction of the refrigerant. This can cause gaps to form, causing water leaks, etc.

Further, according to the method of fixing the sealing plug to the refrigerant injection port using a general adhesive specially designed for plastics, there are the following problems. Namely, ■ workability is very poor because it takes time for the adhesive to dry; ■ the adhesive film cannot follow the expansion and contraction of the container body, resulting in gaps and water leakage; and ■ the passage of time. At the same time, as the adhesive is gradually dissolved by the refrigerant water, the adhesive may be eluted into the water, resulting in water stains. When placed, the adhesive strength and the strength of the adhesive coating itself may decrease; (2) The adhesive coating may be damaged by external impact, resulting in water leakage; and so on.

In addition, a method of ultrasonic welding the container body and the sealing stopper may also be considered, but if a liquid such as a refrigerant is present on the contact surface, ultrasonic welding becomes impossible. Therefore, it takes time and effort to completely remove the refrigerant from the contact surface, resulting in very poor workability. Furthermore, since errors associated with such operations are more likely to occur, the rate of defective products increases and manufacturing risks also increase.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing a cooling container that allows a container body and a sealing stopper to be firmly fixed to each other.

[Means and effects for solving the problems] The present invention provides a method for manufacturing a cooling container in which a refrigerant is sealed in a space between an outer wall and an inner wall constituting a container body. a step of injecting a refrigerant into the space from an inlet; a step of applying an ultraviolet curable adhesive to at least one of the refrigerant injection port and a sealing plug insertable into the refrigerant injection port; The method is characterized by comprising a step of fitting the sealing plug into the refrigerant injection port, and a step of hardening the ultraviolet curable adhesive by irradiation with ultraviolet rays to fix the sealing plug to the container body.

The ultraviolet curable adhesive is a liquid adhesive containing an ultraviolet curable resin such as special urethane acrylate,
For example, a 1 mm thick adhesive is cured by irradiating it with ultraviolet light of 100 mW/c♂ for 5 to 10 seconds.

The ultraviolet curing adhesive may be applied to either the refrigerant injection port or the sealing plug, but it may be applied to both.

Conditions such as the irradiation intensity and irradiation time of ultraviolet rays to the ultraviolet curable adhesive can be appropriately set based on the type of adhesive used, the thickness of the applied adhesive, and the like.

The sealing stopper and the refrigerant inlet of the container body into which the sealing stopper is fitted are preferably made as small as possible in consideration of improving the efficiency of the fixing work.

[Example] An example of the method for manufacturing a cooling container according to the present invention will be described with reference to the drawings.

First, as shown in FIG. 1(A), a plastic cooling container IO used in this example is prepared. The cooling container 10 has a container main body 11 having a double structure of an outer wall l2 and an inner wall 13, and has a space 14 between the outer wall l2 and the inner wall 13 in which the refrigerant 1 is sealed. The outer wall 12 includes an outer wall portion 12A in which the handle 15 is formed and a bottom surface portion 12B in which the refrigerant inlet 16 is formed, which are fixed together by ultrasonic welding or the like. This refrigerant inlet l6 is
It is formed to have a sufficiently small diameter, for example, a diameter of 3 m+n, to the extent that there is no problem in injecting the refrigerant I into the space I4. Here, the small diameter is not necessarily limited to a round hole, but means a hole with a small opening area.

The overall size of the cooling container 10 varies depending on the purpose, but for beverages such as beer and juice, the outer diameter is 50 mm.
~120fflm, and the height is about 70~180w+m.

This cooling container 10 is placed upside down, and a refrigerant l, such as water, is injected into the space l4 from the refrigerant inlet 16 of the bottom part 12B.
After injecting the refrigerant l, the refrigerant l adhering to the inner peripheral surface of the refrigerant inlet l6 is wiped clean.

Next, as shown in FIG. 1(B), the inner circumferential surface of the refrigerant inlet l6 is filled. After applying a thin layer of ultraviolet curable adhesive 2A, a sealing plug l7 made of the same type of plastic as the container body IO is fitted into the refrigerant inlet l6, and then the part where the sealing plug l7 and the container main body IO come into contact is Apply the ultraviolet curing adhesive 2B in a circumferential manner so as to cover it.

The ultraviolet curing adhesive 2B in this part has a diameter of 6 to 15 mm, preferably 6 to 10 mm, and a thickness of 1 to 10 mm.
6 mm, preferably 1 to 3 mm. As these ultraviolet curing adhesives 2A and 2B, for example, World Lock No. 2, which is mainly composed of modified acrylate, is used. PC-0
1HC trade name, manufactured by Kyoritsu Kagaku Sangyo ■] can be used. The dimensions of each part of the sealing plug 17 are, for example, the diameter of the part inserted into the refrigerant inlet 16 is 3 mm and the height is 1.5 mm, and the diameter of the head is 6 mm and the height is 1 mm.
shall be.

Next, as shown in FIG. 1(C), this cooling container 10 is passed through an ultraviolet irradiation device 20 to apply an ultraviolet curing adhesive 2A.
, 2B is cured. This ultraviolet irradiation device 20 is provided with two IkW ultraviolet lamps 2l at the top and a belt conveyor 22 for continuously transporting the container body 11 at the bottom. A cooling container IO is conveyed inside this ultraviolet irradiation device 20 on a belt conveyor 22,
By being irradiated with the ultraviolet rays 3 for 10 to 20 seconds, the ultraviolet curable adhesives 2A and 2B applied around the refrigerant injection port 16 and the sealing plug 17 are cured.

Thereby, the cooling container IO of this embodiment in which the sealing plug 17 is fixed to the container main body 1l is obtained.

According to the above embodiment, since the sealing plug 17 is fixed to the container body 11 using the ultraviolet curing adhesives 2A and 2B, both can be fixed in a short time by irradiation with the ultraviolet ray 3. , the workability when manufacturing the cooling container 10 is improved.

In addition, the sealing plug l
The cooling container IO to which No. 7 is fixed has a reliable and strong seal, so water leakage does not occur due to expansion and contraction of the refrigerant and the container, unlike cooling containers obtained by conventional methods. It disappears. Therefore, the incidence of defective products in the cooling container 10 is reduced, so that manufacturing risks can be reduced.

Furthermore, in this embodiment, by making the sealing plug 17 smaller and the diameter of the refrigerant inlet 16 smaller, the following effects can also be obtained. That is, (1) the appearance is improved and dirt can be prevented from entering, (2) the smaller the sealing plug 17 is, the better the workability is, and the cost of the adhesive and the sealing plug 17 can be reduced; The smaller the cross-sectional area of the stopper l7, the smaller the stress on the expansion and contraction of the container body 1l, and the lower the incidence of defective products due to water leakage. If this happens, shake it upside down and it will come out little by little, making it easy to adjust the amount of refrigerant 1 to be injected.

In addition, in the above example, the ultraviolet curing adhesives 2A and 2B
When irradiating ultraviolet 3 to the cooling containers 10, the cooling containers IO are placed on the belt conveyor 22 of the ultraviolet irradiation device 20 so that the process can be performed continuously. You can also use it as

Further, in the above embodiment, two ultraviolet lamps 2l were provided in the ultraviolet irradiation device 20, but the desired manufacturing time and device 20
The number and irradiation intensity of the ultraviolet lamps 2l may be determined in consideration of the installation space, etc.

In the above embodiment, the ultraviolet curable adhesive 2A was applied thinly only to the inner circumferential surface of the refrigerant inlet l6, but it could also be applied to the sealing plug l7 side or sealed with the inner circumferential surface of the refrigerant inlet l6. Stopper l7
It may be applied to both.

Furthermore, the cooling container IO is not limited to a cup-like shape, but may be of other shapes such as a plate-like shape.

[Effects of the Invention] According to the present invention, the sealing stopper can be firmly fixed to the container body in a short time, so that the manufacturing efficiency of the cooling container can be improved.

[Brief explanation of drawings]

FIGS. 1(A) to 1(C) are process diagrams showing a method of manufacturing a cooling container according to an embodiment of the present invention. l...refrigerant, 2...ultraviolet curing adhesive, 3...
Ultraviolet light, IO...Cooling container, 11...Container body, l
2...Outer wall, l3...Inner wall, l4...Space, l
6... Refrigerant inlet, 17... Sealing plug, 20... Ultraviolet irradiation device.

Claims (1)

[Claims] (1) A method for manufacturing a cooling container in which a refrigerant is sealed in a space between an outer wall and an inner wall constituting a container body, including the step of injecting a refrigerant into the space through a small-diameter refrigerant injection port formed in the outer wall. , a step of applying an ultraviolet curable adhesive to at least one of the refrigerant inlet and a sealing plug insertable into the refrigerant inlet; a step of fitting the sealing plug into the refrigerant inlet; A method for manufacturing a cooling container, comprising: curing an ultraviolet curable adhesive by irradiating ultraviolet rays to fix the sealing plug to the container body.