JPS60217909A - Method of sealing vessel made of paper for filling liquid - 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 relates to a method for sealing the top opening of a liquid-filled paper container.

B. Prior art In recent years, as a container body for liquid contents such as alcoholic beverages and fruit juices,
Paper containers having a heat-sealed portion made of a resin coating layer are often used.

FIG. 1 is a perspective view illustrating the above-mentioned paper container (P). After filling the paper container (P) with liquid contents through the upper opening (1) indicated by the two-dot chain line, the upper part of the container is heated. The upper opening (1) of the container body having a resin coating layer inside is folded to form a sealing area by welding, and the abutting surfaces are sealed by thermal welding of the resin coating layer.
It is transported to subsequent processes such as a leak testing process, a packaging process, or a packing process in accordance with conventional methods.

However, according to the conventional sealing method described above, paper containers filled with liquid contents often have their side walls (2) bulging outward due to the weight of the liquid contents (in this state, When the top opening (1) is sealed, the air remains trapped in the space above the container, resulting in the production of a large amount of products with low commercial value in which the body of the container swells due to the weight of the liquid contents. That will happen.

The bulge of the body (2) of the paper container (P) can be reduced to some extent by selecting the material for forming the paper container, but the selection of usable equipment is limited from the perspective of reducing manufacturing costs. Once such a bulge occurs, it hinders the productivity of the packaging process or subsequent processes such as the packaging process, and furthermore, the aesthetic appearance of the final product deteriorates, resulting in a significant decrease in product value. A major decline is caused. “Also, as mentioned above, when attempting to seal the top opening (1) of the paper container (P) while the body (2) is still inflated, a pinhole-like portion appears on a part of the sealing surface. A communication channel may be formed.This communication channel is formed in a paper container (P
), it also functions as an inflow path for air from outside the system into the paper container (P), so as long as such a communication path exists, there will be no possibility of bacteria invading the liquid contents stored in the paper container (P). It is impossible to guarantee hygienically favorable storage conditions without the risk of damage. That is, the conventional sealing means for liquid-filled paper containers has been found to have problems that cannot be overlooked, not only in terms of productivity and aesthetic deterioration, but also in the storage stability of the filled liquid contents.

9. Purpose of the Invention The purpose of the present invention is to provide liquid-filled paper that can improve the storage performance of liquid contents stored in a container and maintain the sealing performance of the final product at a good level over a long period of time. An object of the present invention is to provide a method for sealing a manufactured container.

Another object of the present invention is to provide a means for sealing a paper container that does not have a bulge in the body of the container and is effective in improving productivity in subsequent processes and improving the aesthetic appearance of the final product. .

C0 Structure of the Invention The present invention provides a method for filling the inside of the paper container (P) with a liquid content from the top opening (1) of the paper container (P). The wall (2) is pressed to raise the liquid level of the liquid contents, and in this state, the upper two side openings (1) of the paper container (P) are sealed, thereby creating a depressurized air-filled space inside the container. The gist of this paper is a method of sealing a liquid-filled paper container that forms a liquid-filled paper container.

2. Example FIG. 2 is a front view illustrating a sealing device used in carrying out the method of the present invention, FIG. 3 is a plan view of a container conveyance path in the method of the present invention, and FIG. B) is a front view illustrating how to seal the top opening of the paper container using the above-mentioned sealing device, and FIGS. 5(A) and 5(B) are side views of the paper container sealed by the method of the present invention. and a plan view.

In FIG. 2, the sealing device (M) is composed of a transport mechanism <T) for the paper container (P) and a clamp mechanism (C) for welding and sealing the top opening (1) under heating.

The transport mechanism (T) arranged perpendicularly to the plane of the paper is
Attached to a total of four endless conveyance chenos (10), (10), two above and below, arranged along the conveyance path of the paper container (P), and the endless conveyance chenos (10), (10)-. A support member (11) having an L-shaped cross section that holds the paper container (P) from the four corners, <11) -1 Along the bottom wall surface of the paper container (P) transported by the endless transport chain. It consists of a second support member for a paper container (P) consisting of a large number of rollers (12), (12), etc. arranged in the same direction.

On the other hand, the clamp mechanism (C) includes a set of two fixed members (15) each having an elongated hole (14) into which a pivot shaft (13) described later is fitted, and a piston rod (16) that moves up and down. An air cylinder mechanism (17) disposed between the fixed members (15) is fixed to the tip of the piston rond (16), and swing arms (18), (1) are attached to the end of the body.
8) Lifting member (19) whose one end is rotatably connected
, forming a pair of left and right, each of which has the above-mentioned swing arm (18
), (18), and clamp members (20), (20) formed by rotatably connecting the other ends of the clamp members (
20), (20) are connected in a swingable manner, and the pivot shaft (13) is fitted into the elongated hole (14).

Furthermore, the sealing device (M) is equipped with the sealing device (M) shown in FIGS. 2 to 4t! As seen in Figure 1, the paper container (P
) is provided with a pressing mechanism (not shown) that presses the side wall portion (2) to recess the side wall portion (2) toward the inside of the vessel. As the pressing mechanism, for example, an air cylinder mechanism,
A fluid cylinder mechanism such as a hydraulic cylinder mechanism or a push plate connected to a reversibly rotatable step motor can be used.

Hereinafter, the procedure for sealing the paper container (P) according to the method of the present invention will be explained with reference to FIGS. 2 to 4 (A) and (B).

The paper container (P) is a container whose bottom wall is sealed and whose top end is open, and the support members (11) of the transport mechanism (T), (
11) ... - are put one by one into the temporary folding process (a)
After the upper part is creased for heat sealing, it is transported to the liquid content filling step (b).

The paper container (P) into which a predetermined amount of liquid content has been injected from its top opening (1) in the filling step (B) is then heated using a known method such as a high-frequency heating device in a heating step (C). Heating means (
In step H), the resin coating layer on the sealing surface is melted and introduced into step (d) of sealing the upper surface opening according to the present invention.

During the transportation from the heating process (c) to the sealing process (d), the paper container (P) has a temporarily folded side wall part (2).
The upper ends of the clamp members (20), (2
Narrow the opening width of the top opening (1) so that it is located inside the sealing device (M), and in this state reach the sealing device (M);
Pause immediately below the clamp mechanism (C).

In the sealing step (d), the side wall portion (
2) is pressed inward as shown by the arrow (A> in FIGS. 2 to 4), thereby raising the liquid level of the liquid content from (Ll) to (L2). In this state,
The upper opening (1) of the paper container (P) is closed by the clamp mechanism (C).

The procedure for sealing the top opening (1) of the paper container (P) using the clamp mechanism (C) is as follows.

When the piston rond (16) descends from the standby position of the clamp mechanism (C) shown in FIG. 4(A), the rond (16)
) is transmitted to the lifting member (19), and the lowering movement of the lifting member (19) is transmitted to the swinging arm (18), (1
8) to the clamp members (20), (20). As a result, a pair of left and right clamp members (
20), (20) is lowered while sliding the pivot (13) within the elongated member (14) of the fixed member (15), and the lowering operation and
A pressurizing action synthesized from the rotational movement about the pivot (20) is applied to the top opening (1) of the paper container (P) (see FIG. 4(B)). By this pressurizing operation, the upper surface opening (1) of the paper container (P) is firmly sealed by welding of the resin coating layer melted in the heating step (c).

After that, the piston rond (16) is raised to return the clamp members (20), (20) to the standby position, and at the same time, the pressing state against the side wall (2) of the paper container (P) is released. The paper container (P) with its top opening (1) heat-sealed is carried out from the sealing step (d). The paper container (P) whose top opening (1) has been heat-sealed is then transported to subsequent processes such as a leakage inspection process, a packaging process, or a packaging process in accordance with a conventional method.

The side wall (2) of the paper container (P) with the upper surface opening (1) sealed receives lateral pressure due to the weight of the liquid contents at the time when the pressing state of the side wall (2) is released. 2′#!
At J, it expands outward from the state shown by the dotted line, and the height of the liquid level of the liquid content is lowered from the liquid level (L2) at the raised position.

Here, as the liquid level of the liquid content falls, the pressure of the air sealed inside the paper container (P) becomes negative pressure, and when the liquid level of the liquid content falls to (L3), the inside of the container The negative pressure state generated in
A flat vessel wall surface as shown by the solid line in Figures (A) and (B) is maintained.

By the way, if there is a sealing failure in the paper container (P), outside air will flow in from that location, and the atmospheric pressure inside the container will rise from negative pressure to the same atmospheric pressure as the outside air. As a result, the balance between the negative pressure inside the container and the lateral pressure due to the weight of the liquid contents is broken, and the liquid level of the liquid contents drops from (L8) to the liquid level height at the time of injection (Ll), and along with this, , the lateral pressure due to the weight of the liquid contents acts on the side wall (2) of the paper container (P), and the side wall (2) is exposed to the outside indicated by the two-dot chain line in FIGS. 5(A) and (B). This causes a bulge in the direction.

Therefore, the method of the present invention can also exhibit good detection performance as a means for detecting liquid leakage from a paper container (P) after the top opening (1) is sealed.

When carrying out the present invention, the amount of pressure applied to the side wall (2) of the paper container (P) should be adjusted as appropriate depending on the material, dimensions and shape of the paper container (P), and the specific weight of the liquid contents. However, the timing to start pressing the side wall part (2) is during the sealing process (d).
It is also possible to start the pressing operation not only after the paper container (P) is introduced into the container, but also in a preceding process such as the heating process (c).

Further, in a different embodiment of the present invention, an additional suppressing action may be provided to the bottom wall surface together with the side wall portion (2).

E.3 Effects of the Invention As is clear from the above explanation, the method of the present invention generates a liquid level raising function by the negative suction force of the air sealed together with the liquid contents inside the sealed paper container. Therefore, it is possible to effectively suppress the swelling of the side wall surface of the paper container due to the weight of the liquid contents. Therefore, by employing the method of the present invention, not only the aesthetic appearance of the final product is improved, but also good workability can be ensured when packing a predetermined number of products into boxes.

In addition, if there is a sealing failure in the paper container, outside air will flow into the container and the pressure will be virtually the same inside and outside the container wall, causing the negative pressure suction caused by the sealed air to be lost. , the side walls bulge outward due to the weight of the liquid contents. Therefore, by inspecting whether or not there is a bulge in the wall surface of the paper container, it is possible to easily inspect whether or not there is a sealing defect.

[Brief explanation of drawings]

FIG. 1 is a perspective view illustrating a paper container, FIG. 2 is a front view illustrating a sealing device used in carrying out the method of the present invention, and FIG. 3 is a plan view of a container conveyance path in the method of the present invention. , FIGS. 4(A) and (B) are front views illustrating the method of sealing the top opening of the paper container using the above-mentioned sealing device, and FIGS. 5(A) and (B) are front views showing the method of the present invention. FIG. CP) ...Paper container, (1) ...Top opening, (2
)...Side wall of paper container, (M)...Sealing device, (T)
...Conveyance section, (C) ...Clamp mechanism. Patent applicant Osaka Kiko Co., Ltd. Agent Sho Ehara Hideo Ehara *1g Figure 5 12 Figure 4Q (B)

Claims (1)

[Claims] (1) After filling the inside of the paper container with liquid contents from the top opening of the paper container, press the wall of the paper container to raise the level of the liquid contents, and in this state. A method for sealing a liquid-filled paper container, the method comprising: sealing the top opening of the paper container.