JPS591899A - Supply method of liquefied inactive gas - Google Patents

Abstract

PURPOSE:To supply liquefied inactive gas to be maintained as a fine flow, by guiding the liquefied inactive gas flowing down as the fine flow to a curved pipe, whose internal wall is heated, and supplying the liquefied inactive gas into an opened vessel as the fine flow in the same direction to the moving direction of the opened vessel. CONSTITUTION:A needle valve 3 is provided to a liquefied nitrogen tank 1, and liquefied nitrogen 5 is discharged from this needle valve 3. Though the nitrogen is normally not in a stable flow, a very stalble fine flow is obtained if the liquefied nitrogen is procolated through a receiver 6 made of sintered metal. While a heater 9 is provided to a curved pipe 8 tilted in the moving direction of an opened vessel 11, and the liquefied nitrogen is allowed to flow into the opening vessel 11.

Description

Detailed Description of the Invention The present invention is a method of injecting liquefied inert gas such as liquefied nitrogen into an open container such as an unsealed thin-walled metal can such as aluminum or plastic can filled with non-carbonated beverages or other canned products. It relates to a feeding device.

Conventionally, when filling non-carbonated beverages and other canned products into thin-walled metal cans such as aluminum or plastic cans, etc., 1). In order to increase the pressure inside the container and prevent the contents from oxidizing, a method has been adopted in which a liquefied inert gas such as liquid nitrogen is introduced immediately before sealing.

The main method of supplying liquefied inert gas has been to detect unsealed containers sent by a conveyor or the like and intermittently drip liquefied gas into them. .

However, with this method, slight differences in time, variations in the size of droplets, variations in the number of droplets, etc. can cause variations in the amount of liquefied inert gas supplied and the pressure in the container after sealing. There was a big difference.

In order to solve these problems, the inventors of the present invention have conducted extensive research and succeeded in turning the liquefied inert gas into a trickle by exuding it through an r-permeable receiver. Developed a device for continuously flowing liquefied inert gas into a container to be supplied (Patent application No. 57-24879).
), succeeded for the first time in significantly reducing the variation in gas pressure inside a sealed container.

However, when we examine this device in more detail, we find that the proportion of liquefied inert gas remaining in the container is
It was found that it did not reach the expected value of 1.

The inventors focused on this problem and investigated various types, and found that the cause was a considerable difference in velocity in the downward direction between the open container and the flowing liquefied inert gas. They also discovered that there was a considerable speed difference in the eastern direction between the liquid level of the contents in the open container and the flowing liquefied inert gas, and as a result of intensive research, they completed the present invention. I came to the conclusion.

The present invention is an apparatus for continuously supplying liquefied inert gas to a moving open container, in which the liquefied inert gas flowing non-directly in the form of a trickle is applied to an extent that the inner wall is not wetted by the liquefied inert gas. A method for supplying liquefied inert gas, which is characterized by introducing the liquefied inert gas into a heated curved pipe and supplying the liquefied inert gas to an open container as a horizontally obliquely downward or lateral trickle in the same direction as the moving direction of the open container. It is.

The first point of the present invention is to bend the flow of liquefied inert gas that falls non-directly in the direction of movement of the open container so that it is diagonally downward, preferably almost horizontally, and The purpose is to reduce the difference between the outflow speed of the gas and the moving speed of the open container, preferably by adjusting the distance under the non-direct flow of the liquefied inert gas so that the two speeds are approximately equal.

In addition, by changing the non-straight flow to the lateral direction in this way, the velocity of the flow of liquefied inert gas in the non-straight direction can be made very small. In this state, the velocity in the non-orthogonal direction during injection can be made almost zero.

The second point of the present invention is that in changing the vertical flow of liquefied inert gas to the lateral direction (), ``a part of the curved pipe is heated to the extent that the inner wall is not wetted by the liquefied inert gas.'' There is a particular thing.

Normally, when a liquid such as a liquefied inert gas is guided through a curved pipe, the liquid flows at the bottom of the curved pipe and falls in the form of droplets at the tip. If the liquefied inert gas falls in the form of droplets, variations will occur at the supply end.

In order to prevent such droplet-like falling, the present inventors investigated various methods and found that the surface temperature of the inner wall of the curved pipe was lowered by contacting the inner wall with the boiling point of the liquefied inert gas. By dividing the temperature by 1 to a temperature at which the partially vaporized inert gas acts as a lubricant (in the case of liquefied nitrogen gas, set the temperature of the curved pipe to 150°C or higher).
For the first time, we succeeded in maintaining a trickle of liquefied inert gas both inside a curved pipe and when injected.

The invention will now be described by way of one specific embodiment.

FIG. 1 is a preliminary drawing for explaining this embodiment. In this figure, l is the inner wall of the liquefied nitrogen tank, 2 is its outer wall, 3 is the needle of the needle valve, and 4 is its hole. 5 is the liquefied nitrogen discharged from the needle valve, which usually does not flow in a stable manner, 6 is the receiver made of sintered dust, and 7 is the liquefied nitrogen exuded from it.
It forms a very stable trickle. 8 is a bent pipe, 9 is a heater, 1o
11 is a can (one of the cans lined up), 12 is a non-carbonated beverage, and 13 is a conveyor.

In this embodiment, the open can 11 containing the non-carbonated beverage is moved approximately 1007 mm in the direction of the arrow by the conveyor.
71. moving at a speed of 4], liquid nitrogen is 5g/min.
liquid nitrogen is poured into the mountain from the tip of the curved pipe at a horizontal speed of about 17 m/s (100 m/min).

When liquid nitrogen was injected under the same conditions as before, only an average of 29 cc of nitrogen remained per can, but in this example, only 1 cc of nitrogen remained per can.
Mountain ridge 1] An average of 42.300 nitrogen remains,
Clearly, the effects of the present invention were tolerated.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing one integrated embodiment of the present invention 1), 3 is a needle of a needle valve, 4 is a hole thereof,
6 is a sintered all-steel receiver, 8 is a bent pipe, 9° is a heater, and 11 is a can. Applicant Suntory stock% formula%

Claims (1)

[Claims] A device is installed to continuously supply liquefied inert gas to a moving open container, and the liquefied inert gas that flows vertically in a trickle is heated to such an extent that the inner wall is not wetted by the liquefied inert gas. liquefied inert gas is introduced into an open container, and is supplied to the open container as a horizontally obliquely downward or horizontal trickle in the same direction as the moving direction of the open container. Method.