JPH0638770B2 - Cooling container manufacturing method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing a cooling container, and more particularly to a method for fixing a sealing plug of a refrigerant to a container body.

BACKGROUND ART Conventionally, there has been proposed a cooling container in which a coolant such as water is sealed in a space between an outer wall and an inner wall which form a container body (Japanese Utility Model Laid-Open No. 63-57980). By putting this cooling container in a refrigerator to freeze the refrigerant in the space, it is possible to cool and drink uncooled beverages such as beer, or to keep cold beer for a long time.

In such a cooling container, after injecting the refrigerant into the space through a relatively large refrigerant injection port formed on the entire bottom surface of the outer wall or the like, a sealing plug is welded to the refrigerant injection port by heating, for example, or It is manufactured by fixing the sealing plug to the refrigerant inlet with the plastic exclusive adhesive.

[Problems to be Solved by the Invention] In the conventional method for manufacturing a cooling container described above, the method of welding the sealing plug to the refrigerant inlet by heating has the following problems. That is, since both the container body and the sealing plug are melted, the appearance of the welded part becomes dirty, and if the thickness of the welded part is uneven without uniform melting, it is not possible to follow the expansion and contraction of the refrigerant. There are gaps and water leaks, etc.

Further, according to the method of fixing the sealing plug to the refrigerant injection port with an adhesive for exclusive use of general plastics, there are the following problems. That is, since it takes a long time to dry the adhesive, the workability is very poor.Because the coating film made of the adhesive cannot follow the expansion and contraction of the container body, a gap is created and water leaks. Since the agent is gradually dissolved by the water of the refrigerant, the adhesive elutes into the water and stains of the water occur, heat aging for a long time and high temperature,
When it is placed under conditions such as low temperature and high humidity, the adhesive strength and the strength of the adhesive coating itself are reduced, and the external impact causes damage to the adhesive coating, resulting in water leakage.

Although a method of ultrasonically welding the container body and the sealing stopper may be considered, ultrasonic welding cannot be performed if a liquid such as a refrigerant is present on the contact surface. Therefore, it takes a lot of time and effort to completely remove the refrigerant from the contact surface, and the workability becomes extremely poor. Further, since errors due to such work are likely to occur, the defective product rate is increased and the manufacturing risk is increased.

An object of the present invention is to provide a method for manufacturing a cooling container in which a strong fixed state between the container body and the sealing stopper can be obtained.

[Means and Actions for Solving the Problem] The present invention relates to a method for manufacturing a cooling container in which a refrigerant is sealed in a space between an outer wall and an inner wall that form a container body, and a small-diameter refrigerant injection formed on the outer wall. A step of injecting a refrigerant into the space through an inlet, a step of applying an ultraviolet curable adhesive to at least one of the refrigerant inlet and a sealing stopper insertable into the refrigerant inlet, and the sealing stopper. The method is characterized by including a step of fitting into the refrigerant inlet and a step of curing the ultraviolet curable adhesive by irradiation of 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 100 mW / cm ² of ultraviolet rays for 5 to 10 seconds.

The UV-curable adhesive may be applied to either the refrigerant inlet or the sealing plug, but may be applied to both.

The conditions such as the irradiation intensity and irradiation time of ultraviolet rays on 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 plug and the refrigerant inlet of the container body into which the sealing plug is fitted are preferably made as small as possible in consideration of the efficiency of the fixing work.

[Embodiment] An embodiment of a 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 10 used in this embodiment is prepared. In this cooling container 10, a container body 11 has a double structure of an outer wall 12 and an inner wall 13, and has a space portion 14 between the outer wall 12 and the inner wall 13 in which the refrigerant 1 is enclosed. The outer wall 12 is formed by integrally bonding an outer wall portion 12A having a handle 15 and a bottom surface portion 12B having a coolant inlet 16 by ultrasonic welding or the like. This refrigerant inlet 16 is
It is formed to have a sufficiently small diameter, for example, a diameter of 3 mm, so as not to hinder the injection of the refrigerant 1 into the space portion 14. Here, the small diameter does not necessarily mean a round hole, but means a hole having a small opening area. The size of the entire cooling container 10 varies depending on the use, but for beverages such as beer and juice, the outer diameter is 50 to 120 mm and the height is 70 to 18 mm.
It is about 0 mm.

The cooling container 10 is placed upside down, and the coolant 1 such as water is introduced into the space 14 from the coolant inlet 16 of the bottom portion 12B.
After injecting, the coolant 1 adhering to the inner peripheral surface of the coolant inlet 16 is wiped off cleanly.

Next, as shown in FIG. 1 (B), after the ultraviolet curing adhesive 2A is thinly applied to the inner peripheral surface of the refrigerant inlet 16, a plastic sealing plug 17 of the same kind as the container body 10 is poured into the refrigerant. The ultraviolet curable adhesive 2 is fitted in the inlet 16 and then circumferentially so as to cover a portion where the sealing plug 17 and the container body 10 are in contact with each other.
Apply B. The ultraviolet curable adhesive 2B in this part is
For example, the diameter is 6 to 15 mm, preferably 6 to 10 mm,
The thickness is 1 to 6 mm, preferably 1 to 3 mm. Examples of the UV curable adhesives 2A and 2B include World Lock No. PC-0 containing modified acrylate as a main component.
1H [trade name, manufactured by Hirachi Chemical Industry Co., Ltd.] 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
1.5mm, head diameter 6mm, height 1mm.

Next, as shown in FIG. 1 (C), the cooling container 10 is passed through the ultraviolet irradiation device 20 to pass the ultraviolet curable adhesive 2
Harden A and 2B. The ultraviolet irradiation device 20 is provided with two 1 kW ultraviolet lamps 21 on the upper side, and a belt conveyor 22 for continuously transferring the container body 11 on the lower side. Inside the ultraviolet irradiation device 20, the cooling container 10 is sent on a belt conveyor 22,
By irradiating the ultraviolet rays 3 for 10 to 20 seconds, the ultraviolet curable adhesives 2A and 2B applied around the coolant inlet 16 and the sealing plug 17 are cured. As a result, the cooling container 1 of the present embodiment in which the sealing plug 17 is fixed to the container body 11
0 is obtained.

According to the above-mentioned embodiment, since the sealing plug 17 is fixed to the container body 11 by using the ultraviolet curable adhesives 2A and 2B, the fixing state of the both can be obtained in a short time by the irradiation of the ultraviolet rays 3. The workability in manufacturing the cooling container 10 is enhanced.

Further, the sealing plug 1 is made of the ultraviolet curable adhesives 2A and 2B.
Since the cooling container 10 to which 7 is adhered is surely and firmly sealed, water leakage may occur due to expansion and contraction of the refrigerant and the container like the cooling container obtained by the conventional method. Disappear. Therefore, the incidence of defective products in the cooling container 10 is reduced, and the risk in manufacturing can be reduced.

Further, in this embodiment, the sealing plug 17 is made small and the diameter of the refrigerant inlet 16 is also made small so that the following effects can be obtained. That is, the appearance is improved and the contamination and the like can be prevented. The smaller the sealing plug 17, the better the workability, and the cost of the adhesive and the sealing plug 17 can be reduced. The smaller the cross-sectional area, the smaller the stress against expansion and contraction of the container body 11, and the lower the rate of defective products due to water leakage. If the injection amount of the refrigerant 1 is incorrect, for example, if a large amount is injected, If shaken upside down, it will come out little by little, so it is easy to adjust the injection amount of the refrigerant 1.

In the above embodiment, the ultraviolet curable adhesives 2A and 2B are used.
Although the cooling container 10 was placed on the belt conveyor 22 of the ultraviolet irradiation device 20 so as to be continuously processed when the ultraviolet rays 3 were irradiated to the ultraviolet irradiation device 3, a batch method of irradiating the ultraviolet light 3 to each predetermined number of cooling containers 10 was performed. May be

Further, in the above embodiment, the two ultraviolet lamps 21 are provided in the ultraviolet irradiation device 20, but the desired manufacturing time, the device 20
The number of ultraviolet lamps 21 and the irradiation intensity may be determined in consideration of the installation space and the like.

Although the ultraviolet curable adhesive 2A is thinly applied only to the inner peripheral surface of the refrigerant inlet 16 in the above-described embodiment, it may be applied to the sealing plug 17 side or may be sealed to the inner peripheral surface of the refrigerant inlet 16. Stopper 17
May be applied to both.

Further, the cooling container 10 is not limited to the cup-shaped one, and may have another shape such as a dish-shaped one.

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

[Brief description of drawings]

1 (A) to 1 (C) are process drawings showing a method for manufacturing a cooling container according to an embodiment of the present invention. 1 ... Refrigerant, 2 ... UV curable adhesive, 3 ... UV, 10
... Cooling container, 11 ... Container body, 12 ... Outer wall, 13 ... Inner wall, 14 ... Space part, 16 ... Refrigerant inlet, 17 ... Sealing plug,
20 ... Ultraviolet irradiation device.

Claims (1)

[Claims] 1. A method of manufacturing a cooling container in which a refrigerant is enclosed in a space between an outer wall and an inner wall which constitutes a container body, wherein a refrigerant is injected into the space through a small-diameter refrigerant injection port formed in the outer wall. A step of applying an ultraviolet curing adhesive to at least one of the refrigerant inlet and a sealing plug insertable into the refrigerant inlet, and a step of fitting the sealing stopper into the refrigerant inlet. And a step of curing the ultraviolet curable adhesive by irradiating ultraviolet rays to fix the sealing stopper to the container body.