JPS58193247A - Vessel made of paper for hot filling and its manufacture and its device - 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 According to the present invention, the outer shell of the container is made of paperboard or the like having relatively high rigidity, and an inner bottom plate or an inner bag having flexibility or elasticity is attached inside the container, and In a paper container in which an outer bottom plate is separately attached to the bottom of the outer shell, a non-bonded part that communicates with the outside air is formed at the bonded part between the container body and the bottom plate that constitute the outer shell. This paper relates to a container made of Temaro paper, and also attempts to propose a method for manufacturing the container as well as an apparatus therefor.

That is, the present invention, when hot-filling the contents into the container as described above, locally removes the body of the outer shell and the outer bottom plate that maintain the appearance of the container until forced cooling is completed immediately after hot-filling. This includes a method for manufacturing a container, which is temporarily sealed, and after cooling is completed, a pressure is applied to permanently seal the entire outer bottom plate, as well as an apparatus therefor.

As is well known, it is generally necessary to sterilize beverage liquids before filling them into containers, and this treatment is usually applied to the inner walls of the containers as well. However, the simplest sterilization method is to treat the liquid at high temperature (approximately 93°C), then fill the container with the liquid at high temperature and then seal it, thereby simultaneously sterilizing the liquid and the inner wall of the container. be. This method is abbreviated as "hot filling" in this specification, but when hot filling is carried out, the following problems arise. After hot filling, the lid is sealed and hermetically sealed, and when it is cooled, the volume of the liquid in the container contracts, the vapor in the container solidifies, and the volume of the sealed air increases. Due to the isobaric contraction, the volume of the contents decreases, creating a so-called reduced pressure state. If the saizushi itself is made of a highly rigid material, such as a steel can, it can withstand the reduced pressure inside the edge, but if it is made of relatively low-rigid plastic or paperboard laminated with plastic, Otherwise, there is the problem that the container will dent as the pressure decreases, making it look unattractive. Conventionally, in an attempt to solve this problem, the top part of the container (4
Part 11) is coated with a thin At foil that is relatively easily deformed or an At foil with annular folds, and this part is dented due to volumetric contraction, or as shown in Japanese Patent Application Laid-Open No. 56-23461. In this case, the wall of the container is made of a double material, for example, paperboard and polyethylene, and a large part of the wall is glued (leaving a part of it as a non-bonded part), and only the inner polyethylene in the non-bonded part is depressurized. There are known cases where it was sometimes recessed inward. However, in the former method, the top portion is significantly recessed, so when attempting to provide easy opening to this portion, there is an inconvenience in that it is limited. Furthermore, since the top portion is thin, there are concerns about impact or dropping, and the impact resistance is also unsatisfactory.

The latter method also had some unsatisfactory aspects, such as problems with gas barrier properties and uneven inner recesses, giving the container the appearance of an incomplete container when viewed from the inside.

In particular, the present invention provides that the container itself is composed of a relatively rigid outer shell made of paperboard (including one laminated with a plastic film) and a flexible inner bottom plate or inner bag housed within the outer shell. In other words, the deformation of the container due to the volumetric contraction is absorbed exclusively by the change in the shape of the inner bag, and the The temporary seal on the bottom plate of the outer shell handles the air flow required during the process, and the bottom plate of the outer shell is permanently sealed after the inner bag is deformed to maintain its original functions as a container, such as pressure resistance and water resistance. It is designed to make full use of the

To explain the present invention in detail with reference to the illustrated embodiments, FIG. 1 shows a double bottom container having an inner bottom plate, and FIG. This shows the case where the bag is incorporated. In either case, the thickness is approximately 3
The body (Im
) is formed into a cylindrical or conical shape, for example, and a highly flexible material such as a soft polyethylene film, water-resistant paper with a thickness of about 100 μm, or An inner bottom plate (6) made of a material such as A-foil laminated with polyethylene film is adhered to the lower inside of the body (1a) as shown in Fig. 1, or as shown in Fig. 2, Inner bag made with (
2) is adhered with its upper part (2a) to the upper edge of the body part (1a). On the other hand, at the lower end of the body part (1a), for example, the periphery of the bottom plate (3) is bonded through the seaming part (1b), and in this case, as shown in FIGS. The bonded portion is referred to as (4) and the non-bonded portion (4a). In such a case, an air flow path shown by an arrow in the figure is formed in the bottom plate portion of the outer shell (1) via the non-adhesive portion (4a).

In the present invention, as described above, the body (1
When bonding a) and the bottom plate (3), a non-bonded part (4a) is intentionally formed, and this operation is called a temporary seal. 1. After the bottom of the outer shell (1) is temporarily sealed, the inside of the container is filled with the contents by the so-called hot filling. That is, after filling the container with a high-temperature liquid such as juice or alcoholic beverage heated to 60°C to 95°C, the lid (5) is placed on the top of the container and the container is sealed.
Perform natural cooling or forced cooling using methods such as spraying shower water.

At this time, the liquid in the container, the air layer above it, and the upper liquid vapor layer gradually condense or contract in volume as it cools, causing the inner bottom plate (6) or the inner bag (2
) and the outer shell (1) becomes under reduced pressure. In such a case, as shown by the arrow in the figure, the outside air will flow through the outer shell (1) through the non-bonded part (4a) formed by the temporary seal.
1 and the inner bottom plate (6) or the inner bag (2), the outer shell (1) will not be dented due to reduced pressure.
The deformation is caused exclusively by the flexibility of the inner sole plate (6) or the inner bag (2). In this case, the inner bottom plate (6) or inner bag (2) is completely housed inside the outer shell (1) as shown in the figure, so even if the shape is distorted, it will not spoil the appearance of the container. There is no.

After the liquid in the container is cooled, the bottom plate of the outer shell in the temporarily sealed state is permanently sealed.
Main sealing refers to applying heat sealing by heating the non-adhesive portion (4 m) under pressure.

The outer shell (13) of the present invention is made of paperboard laminated with synthetic paper or thermoplastic film.

Proceeding to a concrete explanation of an example of the apparatus used when temporarily sealing and permanently sealing the bottom plate (3) of the outer shell (1) as described above, as clearly shown in FIGS. 4 to 6, An adhesive mechanism is vertically provided in the center of the base Ql) that can be raised and lowered through the base, and an adhesive mechanism that can move up and down in the radial direction about the axis of the adhesive mechanism is provided on the upper surface of the base. A pressure bar Q:ll is provided. The adhesion mechanism 0 includes a vertical rod a9 having a guide member I having a dish-shaped cross section, and a push-up rod a in the shape of a shaft provided so as to surround the vertical rod 0!19.
Q, and a presser piece aD that can be expanded and contracted between the pusher rod and the plate-shaped guide member Q4), and these act as follows to seal the bottom plate of the container. . That is, the molded container (C) is placed on the ring-shaped container placement surface (lla) at the center of the base Ql), and then the vertical rod 0!19 is moved to the position shown in FIG. and the push-up rod αe are moved upward, and at the same time, the pressure bar Q3 is also moved in the radial direction. In such a case, as is clear from FIG. 6, the plurality of radially arranged pressing pieces aη are pushed up from below via the push-up rod θe, but at that time, the The sliding surface (17 m) is guided by the tapered surface (14a) of the guide member 0 waiting above it, and resists the elasticity of the spring (17b) attached to each pressing piece 07). and expand in the radial direction. Since the pressurizing part (17c) is provided on the outer periphery of the pressing piece aD, the pressurizing part pressurizes the bottom plate part of the container from the inside toward the outside, while the Pressure bar 03
presses the bottom plate portion inward in synchronization with the pressing piece aη. Since the bottom plate of the container is thus subjected to pressure from both the inside and outside, if a pressure-sensitive adhesive has been applied to the bottom plate, for example, the bottom plate will be instantly bonded as a result of the pressurizing operation. In addition, if a heat-sensitive adhesive is applied to the bottom plate part or a heat-melting plastic film or the like is laminated, the pressurizing part (17c) of the pressing piece a7) constituting the adhesive mechanism Q3 An electric heater is built in in advance, and when the pressing piece presses the bottom plate part, it heats the bottom plate part at the same time to perform thermal bonding. The bottom plate of the container is sealed by pressure-sensitive adhesive or heat-sensitive adhesive as described above.
As shown in the figure, the pressing piece an and the pressure bar that perform the sealing action are divided in the radial direction, and as a result, the bottom plate of the container is locally bonded along the circumferential direction, resulting in a so-called non-bonded state. A portion (4a) is formed.

By the way, when performing the main seal after filling the contents in the container and cooling it, follow the above procedure to seal the non-adhesive part (
4 m) may be pressurized or heated under pressure.

7 and 8 show other embodiments of the adhesive mechanism,
Gear-shaped unevenness (18 m) may be formed on the periphery of the pressing piece 0 divided in the radial direction, and the pressurizing action may be performed only by the protruding portion. In the figure, the reference numeral (18b) is a heater, and the reference numeral (11) is a receiving member.

9 and 10 show another embodiment of the container bottom plate according to the present invention, which differs from the previous embodiment in the aspect of the temporary seal. In other words, the lower edge of the body (9) in the outer shell (1) of the container is not provided with a seaming part as shown in FIGS. A U-shaped bottom plate (7) is applied and temporarily sealed. The adhesive portion (8) and non-adhesive portion (8a) constituting the temporary seal portion are arranged in a staggered manner in the lateral direction, as clearly shown in FIG.

When performing a temporary seal in the form shown in FIGS. 9 and 10, it is preferable to use a pressing piece having a structure as shown in FIG. 11. In other words, on the outer periphery of each pressing piece (A) divided in the radial direction, convex portions (
20c), thereby providing staggered bonding portions (8) as shown in FIGS. 9 and 10. The structure of the adhesive mechanism a2 shown in FIG. 11 is the same as that described with reference to FIGS. 4 to 6, except for the outer peripheral portion of the pressing piece.

FIG. 12 shows another embodiment of a double bottom container having an inner bottom plate, in which the inner bottom plate (force peripheral edge (7b)) is connected to the outer shell body (1).
An example is shown in which it is wound inside the seaming part (1b) of a) and fixed with adhesive. Even in this case, the bottom plate (3) of the outer shell (1)
) is locally sealed at the lower end of the barrel (1a).

As described above in detail, the present invention is capable of maintaining a so-called temporarily sealed state on the bottom plate of a paper sealed container until the liquid inside cools down when hot filling the inside of the container. to temporarily circulate air,
12. This ensures that the deformation of the container during depressurization that occurs during cooling does not affect the outer shell at all. Therefore, the appearance of the container can be maintained without any damage even during hot filling. Further, according to the present invention, there is no need to consider the deformation of the container itself as described above.
Materials with high gas barrier properties such as aluminum ξ can be used as material for containers.
It is advantageous in that a laminated foil can also be used freely.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing a double-bottomed container in a temporarily sealed state according to the present invention, FIG. 2 is a vertical cross-sectional view of a container with an inner bag housed within the outer shell, and FIG. 4 and 5 are longitudinal sectional views showing the adhesive mechanism used in carrying out the present invention, and FIG. 6 is a cross sectional view of the main parts of the same,
FIG. 7 is a longitudinal sectional view of the adhesive mechanism showing another embodiment of the same as above, FIG. 8 is a plan view showing the action of the pressing piece of the above, and FIG. 9 is a bottom plate showing another container temporarily sealed according to the present invention. 10 is a longitudinal cross-sectional view of FIG.
The figure is a longitudinal sectional view showing another embodiment of the adhesive mechanism, and FIG. 12 is a longitudinal sectional view showing another embodiment of the double-bottomed container according to the present invention. (l): Outside a (la): Torso (lb)
) : Sealing part (2) : Inner bag (2g) : Top edge (3) (crab bottom plate (4) + 8) : Adhesive part (4a) (8a) : Non-adhesive part (5) : Lid (6) (Crab inner bottom plate (9): body part
Qll: Base (lla): Container placement surface
a2: Adhesive mechanism Q: 1: Pressure bar 041
=Guide member (14a): Tapered surface αS: Vertical rod OQ: Push up rod ←7): Pushing piece (17a)
: Sliding surface (17b) Nispring (17c
): Pressure part Qe0i*: Pressing piece (18a)
: Unevenness (18b) Heater OI: Receiving member
(2+lc) :Tenbu Honshu Paper Co., Ltd. Agent Naoe Ashida Figure 1 Figure 2 Figure 5 Figure 3 Mu W & 7 Figure 1818 8FIA jI 9 Figure 10

Claims (3)

[Claims] (1) The outer shell of the container consists of a body, a lid, and a bottom plate made of a material mainly made of paper, which has relatively high rigidity, and an inner bottom plate or inner bag made of a flexible material is placed inside the shell. A hot-filling paper container characterized in that, in the assembled container, a non-adhesive part communicating with outside air is formed at the adhesive part between the body and the bottom plate. (2) The outer shell of the container is formed of a material mainly made of paper with relatively high rigidity, and an inner bottom plate or L inner bag made of a flexible material is combined inside the shell, and the bottom plate of the outer shell is When sealing the parts, the outer shell body and the bottom plate are locally bonded to form a non-bonded part, and then the container is hot-filled and sealed, and while the contents cool down. , air is allowed to flow inside the outer shell through the non-bonded part, and the volumetric contraction of the contents due to cooling is absorbed by exclusively deforming the inner bottom plate or the inner bag, and the outer shell bottom plate is used as a cooling technique. A method for producing a hot-filled paper container characterized by sealing the entire area of the container. (3) A pressure bar that is located outside of the pressure section and is movable in the rear direction of the cow is opposed to a pressure section that has a plurality of suppressing pieces that are divided in the radial direction and can be expanded and contracted. 1. An apparatus for manufacturing a hot-filled paper container, characterized in that a cylindrical or prismatic receiving member is provided in place of a pressurizing bar.