JPS61115818A - Method and device for replacing inert gas to liquid paper vessel - 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 Field of Industrial Application This field relates to a filling method and a filling device for forming, filling and sealing paper containers for liquids, and in particular, it relates to a filling method and a filling device for forming, filling and sealing paper containers for liquids. A technical field that fills the head space of a container with a space (a gable top paper container with a roof-shaped top always generates a head space) and replaces the air that existed in the space. Regarding.

Conventional technology In metal cans, glass bottles, and plastic containers, to prevent the contents from oxidizing, inert gas is introduced into the head space by dropping droplets of inert gas into the container or by injecting gas from a nozzle. Encapsulation has conventionally been widely practiced. However, the technique of performing gas replacement in a liquid paper container in which a head space exists is a relatively new matter that has been studied. For example, JP-A-58-73521
No. 58-216526 discloses that gas is blown from below through a permeable membrane that does not allow liquid to pass through but allows gas to pass through, either under water or by inverting the inner lid after sealing it. The method is described. The above-mentioned method uses a special permeable membrane, and the gas blowing device is still large.1 It is necessary to insert a gas replacement process into the filling machine by only partially modifying the filling machine that is normally used. I couldn't. The method of dropping droplets of inert gas is also impractical because the vaporization of the droplets creates excessive pressure inside the liquid paper container after the top is sealed, which may cause the paper container to burst. It was possible.

The problem that the invention aims to solve What is the taste, aroma, nutritional content, etc. of liquid contents such as fruit juice?

The paper container is oxidized and changed over the course of one hour due to the oxygen contained in the air remaining in the paper container after being sealed. Conventional gas replacement techniques for antioxidant reservoirs suffer from the aforementioned drawbacks.

The present invention corrects the above-mentioned drawbacks in a composite paper container mainly composed of one paper and layered layers of aluminum and/or synthetic resin such as polyethylene, and adds additional equipment to the filling machine. Just by doing this, gas replacement is performed, and the taste, aroma,
The present invention provides a method and apparatus capable of retaining nutritional components for more than 4 months.The present invention solves the above-mentioned drawbacks by providing a method and a device capable of retaining nutritional components, etc. for more than 4 months. Liquid paper: In the method of forming, filling, and sealing the base on a filling machine, after the first culm of filling the paper container with the liquid, immediately before the top sealing process of the paper container, @Providing a method for replacing inert gas in a liquid paper container, which includes a step of replacing the air existing in the head space of the paper container with an inert gas, and in order to carry out the method, A busy gas IP+F exchange station is provided between the filling station and the stopping station of the filling machine, and a gas filling nozzle is installed at the gas loading station just before the paper container filled with liquid is tossed. The inertness of the liquid paper container is such that it can be raised and lowered between a position higher than the upper edge of the paper container filled with the liquid and a distance that does not cause stagnation due to the injection of gas from the surface of the filled liquid. The present invention provides a gas replacement device.

The replacement device heats the top seal fin, which is the top bonding part of the Gaeltonop type liquid paper container, while preheating the top seal fin, and also heats the top seal fin of the paper container after filling is in progress. There is a part of the filling machine that is moved closer to each other from both sides in the direction of travel by guides, and this part is used as the gas replacement stay 7 for 1 or 2, and a gas filling nozzle with an internal diameter within an appropriate range is installed. The gas injection port of the nozzle is brought close to the liquid level in the paper container, and the inert gas is ejected at an appropriate flow rate to perform gas replacement. Immediately after that, the top seal fin is sealed to complete the liquid-filled paper container. This is what I did.

Owing to the means and structure described above, there is no need to incorporate an expensive inert gas replacement device into the filling machine, and a gas replacement station can be provided using the space in front of the sealing station of the filling machine. This makes it possible to replace gas in the liquid paper container, and prevents oxidative deterioration of the taste, aroma, nutritional components, etc. of the liquid contained in it at the time of filling, and makes it possible to retain the liquid for more than four months.

EXAMPLE 1 A first example shown in FIG. 3 will be described in ml'. As shown in Fig. 1, in the filling process, at the filling station (not shown) of the filling machine, one gable-top paper container is filled with the liquid content. While being in sliding contact with the guide rail 2, it is moved on the co/bear T in the direction of arrow A to a sealing stain (not shown) in the tonnage process.

11 [1] The guide rails 2.2 are provided on both sides of the paper container 1 in the illumination direction, and the end on the filling station 7 side (left side in the figure) is spaced slightly larger than the width of the paper container 1, and then The paper container 1 is maintained approximately parallel to the width of the container 1 with a distance approximately equal to the width of the container 1, and the paper container 1 approaches the sealing stay 7 side (right side in the figure).
The interval is gradually narrowed until the top seal fins 3, 3 on both sides of the tangled paper container 1 come into contact with each other.

In this embodiment, the area where the guide rails 2.2 and the paper container 1 are substantially parallel to each other at substantially the same distance is used as the gas exchange station 8 in the gas exchange process.

In the gas exchange station 8, a gas filling nozzle 4 is vertically installed directly above the paper container 1 on the core station 8. The gas filling nozzle 4 has a relatively dog-shaped diameter in order to reduce the outflow speed of the inert gas, and has an upper limit position higher than the upper edge of the paper container 1, as shown in FIG.

When lowered into the paper container 1 and injected with inert gas, it is provided so as to be able to move up and down between the liquid level 6 of the content liquid 9 in the paper container 1 and a lower limit position that is low enough not to generate filth. ing.

While the gas filling nozzle 4 is lowered to the lower limit position, inert gas is injected from the nozzle 4 at a predetermined injection speed for a predetermined time (several seconds). The lower limit position and the injection speed of the inert gas mentioned in 111 are set as fast as possible without splashing at the liquid level 9.The diameter of the gas filling nozzle 4 is It is desirable that the opening area of the gas filling nozzle 4 is set close to 301 of the open area of the paper container 1, within a range that does not cause contact.

Figures 2 and 3 show gas replacement conditions.

The inert gas injected from the tip of the gas filling nozzle 4 which has been lowered to near the liquid level 6 in the paper container 1 is diffused into the paper container 1 as shown at 5.

That is, the inert gas is injected toward the liquid level 6.

It is diffused onto the inner wall of the paper container 1, and then spreads along the top seal fins 3 into a cloud shape with a certain thickness and forming a slightly upwardly clump.

The upward velocity of the nodule is determined by the relationship between the density ratio of the inert gas and air, the outflow velocity, and the head space in the paper container 1 above the liquid level 6.

The moving speed of the conovere γ that carries the paper container 1 is determined first for the filling process and the top 7-rue culm after the gas replacement process.

The aforementioned gas replacement process, which cannot be changed due to the installation of the gas replacement process, can be completed in a short time because the gas outflow speed is higher than the compare speed, and as shown in Figure 1, the compare T The paper container 1 after gas replacement, which is located on the sealing station side (a on the right in the figure) in the traveling direction of the paper container 1, is exposed for a short period of time or until the top sealing process is reached.

While the top seal fin 3 is gradually closed.

Since the opening is in an open state, there is a risk that air may enter the paper container 1 after gas replacement.

For this reason, by injecting inert gas into an area slightly larger than the head space above the liquid level 6 of the paper container 1, the top seal fin 3 is gradually closed, as shown in the paper container 1 on the right side in FIG. in.

The paper container 1 is sealed by allowing a small amount of inert gas to come out upward to the outside and heat-sealing the top seal fin 3 in a state where the inert gas is substantially filled in the head space. becomes possible.

As a result of experiments with different outflow speeds of the inert gas and air replacement ratio in the head space, the fourth
The graph shown in the figure was obtained.

As shown in the same graph, it was found that as the outflow rate increases, the substitution rate increases, but if the outflow rate is too high, the lij conversion rate decreases.

Therefore, in order to minimize the loss of inert gas and to perform complete replacement, the size of the head space of the paper container 1, the size of the inner diameter of the gas filling nozzle 4, the amount of inert gas ejected, the ejection time,
The optimum value of the outflow velocity needs to be determined experimentally.

Next, a second embodiment shown in FIGS. 5 to 9 will be described. In this example, the gas replacement step is carried out at the gas replacement station 7/8 provided between the filling process and the filling process, which is the same as in the Moe example. Opening i of paper container 1? It is divided into the charging I stay/first gas ffJ stay/yon 8A on the left side of Fig. 5 with a wide i'r frame, and the second gas displacement stay/yon 8B on the right side closer to the sealing station/yeon side. Therefore, the gas replacement process includes a first gas replacement process performed in the first gas replacement station 8A, and a second gas replacement process performed in the second gas replacement station 8B following the first gas replacement process. It's getting better.

The first gas exchange station/yeon 8A is installed following the filling station, and has a large diameter so that the opening of the paper container 1 on the co/pair 7 can be spread over a wide range and can be raised and lowered. J, 1 gas filling nozzle 4A is installed overlappingly.

Following the first gas replacement station 78A, the second gas replacement station 8B is a second gas replacement station with a smaller opening area (!11) in which the opening area of one paper container 1 is reduced.
A gas filling nozzle 4B is vertically installed so as to be movable up and down.

One paper container is transported from the filling station to the first gas replacement station 8A by the conveyor 7, and the first gas filling nozzle is lowered onto the liquid level 6 in the one paper container 1 as shown in FIGS. 6 and 7. 4A, the inert gas is injected into the headspace for a shorter time than by the gas filling nozzle 4 in the first embodiment, as shown at 5A, producing wasted inert gas that drifts to the outside of the upper part of the headspace. I can't close it. In this case, the air in the head space has not been completely replaced by the inert gas, and the paper container 1 in the empty state is then conveyed by the conveyor 7 to the second gas replacement station 88, as shown in FIGS. 8 and 9. The second gas filling nozzle 4B#c having a narrow inner diameter is lowered into the narrowed opening as shown in FIG. 2, and inert gas is injected at a relatively high speed as shown by 5B. This a-2 squirt! JJ&l2L, Fig. 8, 5, 9
As shown in the figure, the i-th
The inert gas can fill the space that was not filled by the injection of the inert gas, thereby reducing the loss of the inert gas.The paper container 1 is immediately sealed with the head space completely replaced. transported to the station.

The reason why the second gas filling nozzle 4B is thin is because the above-mentioned through hole and both top seal fins 3.3 narrow the opening O until they are almost closed as the interval tb of the guide rail 2.2 becomes narrower. With this opening.

This is to enable insertion without any problem.

Effects of the Invention Since the present invention has the structure clearly defined in the claims, there is no need to use a gas permeable membrane, and it is possible to
Instead of installing equipment such as inverting the liquid container to perform gas replacement, we use the space between the heating process and the sealing process on the conventional filling machine as a gas replacement station, and make a slight modification to install a gas filling nozzle. Only by achieving the intended purpose of inert gas replacement, the modification cost is low and the overall conveyor speed is low.

Therefore, gas replacement can be performed without reducing the filling and sealing speed.

[Brief explanation of drawings]

FIG. 1 is a diagonal ↑ M view of the gas replacement station of the first embodiment, and FIG. 2 is a central vertical cross-sectional view of the paper container showing the same inert gas injection state. Fig. 3 is a plan view of the same as above, Fig. 4 is a diagram showing the inert gas outflow velocity and replacement ratio, Fig. 5 is a perspective view of the gas replacement stay 7 side of the second embodiment, Fig. 6 is the first Fig. 3 is a central vertical cross-sectional view of the paper container showing the inert gas injection form in the gas replacement station, and the top view of the seventh layer of the paper container. FIG. 8 is a central vertical sectional view of the paper container showing the inert gas injection state at the second gas redemption station. FIG. 9 is a plan view of the same as above. 1: Paper container, 4.4A, 4B: Gas filling nozzle, 5.5
A, sB: injection gas flow, 6: liquid level. 8: Gas replacement station, 8A: First gas replacement station 7, 8B: Second gas replacement station, 9: Content liquid

Claims (1)

[Claims] 1. Filling and sealing of a liquid paper container, which includes the steps of forming a liquid paper container with a head space at the top of the container on a filling machine, filling it with liquid content, and then sealing it. In the method, after the filling step and immediately before the top sealing step of the paper container, there is provided a step of replacing air existing in the head space of the paper container with an inert gas injected into the head space. A method for replacing an inert gas into a liquid paper container, characterized in that: 2. In the inert gas replacement process, the injection port of the gas filling nozzle installed at the position immediately before the top sealing of the paper container after the filling process is sprayed with gas from the liquid level of the filled content. Inertization of a liquid paper container according to claim 1, which is a step of bringing the liquid paper container close to a distance where no generation occurs, and injecting inert gas from the injection port at a relatively slow speed to replace the air in the head space. Gas replacement method. 3. The inert gas replacement process is performed first with the first gas filling nozzle, which has a large diameter and has a slow inert gas outflow speed, which is installed at the first gas replacement station where the opening area of the paper container after the filling process is wide. A first gas replacement step is carried out, followed by a second gas filling nozzle with a smaller diameter and a faster inert gas outflow speed, which is installed at a second gas replacement station where the opening area of the paper container is narrowed. The second to be done
A method of replacing an inert gas into a liquid paper container according to claim 2, which comprises a gas replacement step. 4. A gas replacement station is provided between the filling station and the sealing station of a filling machine that forms, fills, and seals a liquid paper container with a head space at the top of the container. The gas filling nozzle is placed at a position immediately before the top sealing of the paper container filled with the liquid, and the gas injection prevents splashing from the surface of the filled liquid. 1. An inert gas replacement device for a liquid paper container, characterized in that the device is installed to be able to move up and down over a certain distance. 5. The gas filling nozzle is installed on the first gas replacement station with a large opening area of the paper container immediately after filling with liquid after the filling station of the filling machine. Claim 4, comprising a nozzle and a second gas filling nozzle with a smaller diameter and a faster gas outflow speed, which is provided on a second gas replacement station immediately before the sealing station where the opening area of the paper container is narrowed. An inert gas replacement device for a liquid paper container as described in Section 1.