JPS58183418A - Manufacture of gas enclosed can - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides for
Modification of the method for manufacturing gas-filled canned goods by discharging a desired amount of low-temperature liquefied gas toward the target area through the discharge hole, supplying the low-temperature liquefied gas into the can, and then tightening the can lid.
do.

The above method is to can non-foaming 11-shu (IiL acid gas is not contained in the liquid body, f4 is fruit juice drink, coffee drink, fruit pickled in syrup) by heating filling method. This is the preferred method to use when doing so.

In the case of canned goods manufactured using the hot filling method, when the temperature of the liquid inside the can falls after the lid is tightened, the inside of the can becomes negative pressure, so conventionally, cans with a thickness of 100 ml (200 yen) were used so that they did not dent even if the pressure became negative. was used, but it had no effect on the quality of canned drinks.
・If a gas (e.g. nitrogen gas, argon gas) is sealed inside the can under pressure and the pressure inside the can can be raised to a level higher than atmospheric pressure even when the canned food is cooled to a low temperature, beer can be produced. This method was developed from the viewpoint that it is possible to use cans with a body wall as thin as that of cans with IIK side cans.

The problem with this method is that liquefied gas at an extremely low temperature is injected into a can that moves at high speed, so there is a lot of loss of liquefied gas due to diffusion outside the can or rapid vaporization. be.

One of the countermeasures is disclosed in the %-Sho 56-1619111+ Publication (・ru. In other words, when the droplet T is discharged from the discharge hole and collides with the T box inside the can, the degree of the droplet T of the elephant body is 200C3.
1/second or less (content temperature: 95° C.), the ratio of the amount of residual liquid nitrogen in the can to the amount of supplied liquid nitrogen becomes large, and losses are reduced.

On the other hand, as mentioned above, low-silver liquefied gas (for example, liquid nitrogen has a boiling point of about -196°C) is a cryogenic liquid, so it comes into contact with the atmosphere of the tank that is discharged from the discharge hole and reaches the liquid level in the can. However, when it reaches the liquid level and comes into contact with the moat, it is fully expected that it will vaporize and escape outside the can. Since this vaporization is proportional to the surface area of the discharged liquefied sludge, the actual situation is that the desired amount of liquefied scum is discharged and supplied from one discharge hole.

However, experiments have shown that when low-temperature liquefied gas is injected into a can moving at high speed, the scattering of the liquefied gas or the rapid vaporization of the liquefied gas due to the liquid level in the can is proportional to the impact force at the time of collision. It is known that the
Furthermore, if the same amount of low-intensity gas is to be discharged, it is necessary to open multiple discharge holes to reduce the impact force of the collision with the internal vibration of the can, which will prevent the liquefied gas from scattering and rapid vaporization. It was also found to be effective in suppressing

However, the vaporization of the liquefied gas from the time it is discharged from the discharge hole until it reaches the liquid level in the can is proportional to the surface area of the liquefied gas, so if it is discharged from multiple discharge holes, the amount of liquid will be the same. However, the surface area becomes thicker and the amount of vaporization increases, so the position of the discharge hole must be lowered as much as possible to shorten the distance to the toe of the can to reduce the surface area.

It is preferable that the distance between this is less than 35■ and less than %KIO■.0 In addition, as this distance is shortened, the above-mentioned impact force is reduced accordingly, so the effect of preventing scattering etc. is further enhanced, and the surface area is reduced. The disadvantage of increasing K is fully compensated by KIi.

The present invention was born from such knowledge.

A desired amount of low-temperature liquefied gas is supplied into the can by discharging a desired amount of low-temperature liquefied gas toward the top-opening can through the discharge hole in the direction of the can, which has already been injected into the inner bath moat, and then tightening the can lid. In a method of manufacturing gas-filled canned food.

The method for producing a gas-filled canned food is characterized in that the desired amount of low-temperature liquefied gas v is simultaneously discharged and supplied from two or more discharge holes.

Next, an experimental example of the method of the present invention will be explained.

Experiment l.

A can designated as 202@ with a volume of 250% was used for this experiment. The content liquid is fruit juice IIX mixed with 10% orange juice. This fruit juice drink is heated to 95°C, poured into a can leaving a predetermined head space, and immediately heated at 45% per minute.
0 cans (the distance between the cans is approximately 5 tx). The liquid nitrogen continuously discharged from the outlet hole was placed in the can that it passed through, and then the lid of the can was tightened using a tightening machine.

After passing under the discharge hole, it took about 18 seconds to start tightening.

The distance from the liquid level of the liquid nitrogen storage tank to the tip of the discharge hole is approximately 1
It was set up and controlled in 10 cabinets. In addition, the distance between the tip of the discharge hole and the top of the can passing underneath was set at 5 square meters (head space: 12 square meters). Regarding the iron quality of the storage tank mentioned above, first place A and B in the 5-year-old squares shown in Table 1.

Using 611 discharge holes C, D, E, and F, the discharge amount of the housing*element per minute was kept constant.

Spear 1 Table: In B, C, and D, the discharge hole is parallel to the traveling direction of the can K1.
The cans were arranged in rows, and in E, two rows of four cans were arranged, and in F, three rows of four cans were arranged parallel to the traveling direction of the cans.

Under the above conditions, supply the upper S-RO flrK Suku body ijI nest with the contents injected into the eL and tighten the 17 can bags of Easy-O, cool it to room temperature K, and divide the cans into 25 cans each through various discharge holes. , the internal pressure of the can was kept constant.

The results are shown in Table 1'2.

The number 2 indicates that the internal pressure of the can is lower when there are two or more discharge holes than when there is one discharge hole. This means that the amount of liquid nitrogen remaining in the can is large when there are two or more discharge holes.

Moreover, it is also shown that when there are two or more holes, the variation is smaller and the quality is more stable.

This means that, given the conditions that the amount of liquid nitrogen to be discharged is the same and the discharge speed is the same (the container moat is open to the atmosphere, and the distance between the discharge hole and the can is the same), it is possible to use multiple discharge holes. It can be seen that this is the effect of

The number of discharge holes may be provided in one nozzle Knii+, or they may be provided in multiple nozzles (n/m), or each of the m nozzles may have different discharge holes. It is also possible to provide several discharge holes.

Experiment 2 Same as Experiment 1 (202% volume, called 2SOag). Using a can, water heated to 93°C was poured into the can leaving a head space of about 13 ㎡, and immediately 1200 cans per minute was used. After passing the case under the nitrogen vent hole at a high speed, the easy-open can lid was tightened to tighten the can to 1F*t (it took about 0.5 seconds from filling liquid nitrogen to easy-open power-saving tightening).

The liquid nitrogen discharge device used here is equipped with two nozzles in which five discharge holes each with a diameter of 0.53+W are arranged in two rows parallel to the direction of can travel, and the total discharge amount is 56 nozzles per second. The distance between the 17> (tip of the discharge hole) and the top of the can is 1 m, 5cm, and IQ-, respectively.

25m, 356,501, and the average internal pressure inside the can and its variation were measured.

The results are shown in Table 3.

3 Table 1I The fixed number of servings is 15 cans each. From the experimental result, when discharging low temperature liquefied gas into a can that has a head space and is already filled with liquid, it is necessary to prevent loss of liquefied gas and increase the internal pressure of one can. I want to reduce the variation in 5
I! From this point, it can be seen that it is necessary to make the distance between the discharge hole and the top of the can 35 or less, and in particular, preferable results can be obtained when the distance is 1O or less.

According to the present invention W14, as shown in the experimental data, compared to the conventional case of discharging from one discharge hole, the liquefied gas remaining in the can (after the can lid is tightened, the liquefied gas and This increases the proportion of low-temperature liquefied gas Iki that is necessary to obtain the desired amount of residual liquefied gas.

This again! lIncrease in the proportion of residual gas, in other words, scattering,
The small amount of liquefied male that is lost due to vaporization means that the variation in the amount remaining in the can becomes narrower, and the can lid bulges and deforms due to excessive gas filling, and the can body dents due to too little new gas. Preventing the occurrence of waste products has ~.5 effects.

-2 It goes without saying that the present invention can also be used to manufacture canned goods by cold filling the contents of one can.

In other words, when the supplied liquefied gas vaporizes, the air in the head space inside the can is expelled, making it possible to significantly reduce the amount of oxygen inside the can without hot filling, thus producing canned goods of excellent quality. I can do it.

Representative Patent Attorney Masamitsu Aki Sawa 2 people outside

Claims (1)

[Scope of Claims] (11) Supplying low-temperature liquefied gas into the can by discharging a desired amount of low-temperature liquefied gas through a discharge hole toward a T-box in a top-open can with a predetermined amount of contents poured; Next, a method for manufacturing gas-filled canned goods by tightening the can lid, characterized in that the desired amount of low-temperature liquefied gas is simultaneously discharged and supplied from two or more discharge holes.