JP6282004B2 - Box-shaped pack container filling apparatus and filling method - Google Patents

Description

  The present invention relates to a filling apparatus and a filling method for a box-shaped pack container, and more particularly to filling of an antioxidant gas into a box-shaped pack container.

  2. Description of the Related Art Conventionally, a box-shaped pack container that seals an opening by bending an upper part is known as one of sealed containers. This type of pack container is filled with juices, alcoholic beverages, etc., but is filled with an antioxidant gas such as nitrogen and carbon dioxide together with the liquid contents so that the oxidation of such liquid contents does not proceed. This has also been done conventionally. For example, Patent Document 1 discloses that the container is used twice before the step of filling the liquid content in the container and the step of bending and sealing the upper opening of the container filled with the liquid content. A method is disclosed in which an antioxidant gas (replacement gas) is blown from a blowout port disposed above to replace the remaining air in the container with an antioxidant gas. Patent Document 2 discloses that a uniform mesh blowout is realized by dispersing an antioxidant gas by attaching a mesh-like mesh sheet composed of a large number of fine holes to such a blowout opening. .

JP 2005-145514 A JP 2005-271927 A

  However, in Patent Document 1 and Patent Document 2 described above, the upper opening portion of the box-shaped pack container and the outlet opening facing the box-shaped pack container are separated in the height direction, and there is a gap between them. There is a problem in that the antioxidant gas blown out from the outlet leaks to the outside, leading to a reduction in the charging efficiency of the antioxidant gas. In addition, a working environment in which a large amount of antioxidant gas leaks is not necessarily preferable for the worker.

  Accordingly, an object of the present invention is to improve the filling efficiency of the antioxidant gas filled in the box-shaped pack container.

  In order to solve this problem, the first invention provides a filling device for a box-shaped pack container having a gas supply source, an elevating head, an inlet for an antioxidant gas, and a discharge portion for residual air. The gas supply source supplies an antioxidant gas that prevents oxidation of the contents in the box-shaped pack container. The elevating head is inserted into the box-shaped pack container through an upper opening that can be sealed by bending the upper part of the box-shaped pack container. The inlet provided in the elevating head introduces the antioxidant gas supplied from the gas supply source into the box-shaped pack container. The discharge part is provided in the lifting head itself as a through-hole penetrating the inside and outside of the box-shaped pack container in a state where the lifting head is inserted into the box-shaped pack container, or the outer edge of the lifting head and the box-shaped pack It is provided as a gap with the inner wall of the container. The remaining air in the box-shaped pack container is pushed out by introduction of the antioxidant gas from the introduction port, and is discharged to the outside from the discharge port.

  Here, in the first invention, a movable outer jig for forming a fold for closing the upper opening by pressing and deforming around the upper edge of the box-shaped pack container may be further provided. In this case, an inner jig that holds the box-shaped pack container from the inside may be used as the lifting head so that the box-shaped pack container is not crushed during pressure deformation by the outer jig. The inner jig has a surface shape corresponding to the opening shape of the box-shaped pack container. Also, when providing a stopper that regulates the vertical displacement of the box-shaped pack container by protruding inside the box-shaped pack container and contacting a part of the upper edge of the box-shaped pack container, the lifting head interferes with the stopper In order to avoid this, a notch part in which a part of the outer edge of the lifting head is notched may be used as the discharge part.

  In the first invention, a control valve for controlling the flow rate of the antioxidant gas may be further provided in the flow path from the gas supply source to the introduction port. This control valve opens after the elevating head is lowered and the introduction port reaches the height of the upper opening, and before the elevating head is raised and the introduction port reaches the height of the upper opening. It is preferable to close the valve.

  2nd invention provides the filling method of the box-shaped pack container which has the following 1st to 3rd steps. In the first step, a lifting head is inserted into the box-shaped pack container from the upper opening of the box-shaped pack container, and a part of the upper opening is formed without completely shielding the inside and outside of the box-shaped pack container. Block it. In the second step, in a state where a part of the upper opening is closed by the lifting head, an antioxidant gas for preventing oxidation of the contents in the box-shaped pack container is introduced from the inlet provided in the lifting head. While being introduced into the box-shaped pack container, the remaining air in the box-shaped pack container pushed out by this is discharged to the outside from the non-shielding portion of the lifting head. In the third step, after the introduction of the antioxidant gas into the box-shaped pack container, the contents are filled in the box-shaped pack container, and the upper portion of the box-shaped pack container is bent to seal the upper opening. Stop.

  Here, in the second invention, the second step corresponds to the step of applying pressure deformation around the upper edge of the box-shaped pack container using the outer jig and the opening shape of the box-shaped pack container. It is preferable to have a step of holding the box-shaped pack container from the inside so that the box-shaped pack container is not crushed when the lifting / lowering head having the surface shape is used as the inner jig. In this case, the second step regulates the vertical displacement of the box-shaped pack container by bringing the stopper protruding inside the box-shaped pack container into contact with a part of the upper edge of the box-shaped pack container. In order to avoid the interference of the lifting head with the stopper, the discharge of the remaining air may include a notch portion provided by cutting out a part of the outer edge of the lifting head. This is done by using as a part.

  In the second invention, the second step includes the step of lowering the elevating head and starting the introduction of the antioxidant gas after the introduction port reaches the height of the upper opening. Thus, it is preferable to finish the introduction of the antioxidant gas before the introduction port reaches the height of the upper opening.

  According to the first or second invention, the antioxidant gas is filled in the state where the elevating head is inserted into the box-shaped pack container. Gas filling is performed in a state where a part of the upper opening of the box-shaped pack container is closed by the elevating head. Therefore, compared with the conventional technique in which the antioxidant gas is blown from above the box-shaped pack container, the antioxidant gas Is less likely to leak to the outside, and the charging efficiency of the antioxidant gas can be improved.

Overall configuration diagram of a filling device for a box-shaped pack container according to the present embodiment Perspective view of lifting head Explanatory drawing of the main part of the filling device for box-shaped pack containers Explanatory drawing of the work process using the filling apparatus which concerns on this embodiment. Explanatory drawing of the work process using the filling apparatus which concerns on this embodiment. Explanatory drawing of the release of residual air with the introduction of antioxidant gas Diagram showing opening / closing timing of flow control valve The perspective view of the raising / lowering head which concerns on a 1st modification. The perspective view of the raising / lowering head which concerns on a 2nd modification.

  FIG. 1 is an overall configuration diagram of a filling device for a box-shaped pack container according to the present embodiment. The filling device 1 according to the present embodiment is an existing crease that forms a crease in the upper part of the box-shaped pack container A in order to close the upper opening provided in the upper part of the box-shaped pack container A (see FIG. 3). A function for filling the inside of the box-shaped pack container A with an antioxidant gas is added to the forming apparatus. The filling device 1 is used in a process called “primary habit folding”.

  The positioning of this step in a series of manufacturing steps is generally as follows. First, as a first process, the box-shaped pack container A carried in from the previous process is set on the turntable. At this stage, the box-shaped pack container A is supplied in a semi-assembled state, that is, as a bottomed cylindrical box having only an upper part opened. Subsequent processes for the box-shaped pack container A are sequentially performed in the process of moving in the circumferential direction on the turntable. In the subsequent second step, a cap B (see FIG. 3) is attached to the top of the box-shaped pack container A, and then the cap B is fixed by welding. In the third step, the box-shaped pack container A is subjected to a crease process for closing the upper opening by bending the upper portion of the box-shaped pack container A. The above-described process called “primary habit folding” refers to the third process. In this step, the box-shaped pack container A is bent while introducing an antioxidant gas (subflow) into the empty container by a method described later. Since the filling device 1 used in this step has two functions of forming a fold and filling with an antioxidant gas, both are performed as one step. In the fourth step, liquid contents such as juices and alcoholic beverages are filled into the box-shaped pack container A into which the antioxidant gas has been introduced. In the fifth step, the box-shaped pack container A is bent along the formed folds to close the upper opening, and the upper opening is sealed by welding. In the fifth step, the upper opening is sealed while the antioxidant gas is again introduced (main flow) into the box-shaped pack container A filled with the contents. Finally, as a sixth step, the sealed and packed box-shaped pack container A that has undergone the above manufacturing steps is discharged from the turntable and carried out to a subsequent step. The reason why the antioxidant gas is introduced not only in the main flow (fifth step) but also in the subflow (third step) is that the gas introduced in the subflow leaks outside in the process until it reaches the main flow. In any case, the charging efficiency of the antioxidant gas can be increased as compared with the case of the main flow alone.

  As shown in FIG. 1, the filling device 1 mainly includes a mounting table 2, a side holder 3, a lifting body 4 disposed above the mounting table 2, and a lifting mechanism 5 that lifts and lowers the lifting body 4. In addition, a gas supply system including a gas supply source 6 and a flow rate control valve 7 is provided. A box-shaped pack container A to be worked is placed on the mounting table 2, and the box-shaped pack container A is held from the side by the side holder 3. The lifting body 4 has a lifting head 8, a movable outer jig 9, and a stopper 10, which are attached to the base body 4a. The elevating head 8 is attached to the base body 4a via a pair of support rods 4b, and is inserted into the container from the upper opening of the box-shaped pack container A when the elevating mechanism 5 is lowered. The outer jig 9 is used to form a crease at the top of the container when the upper opening of the box-shaped pack container A is closed. The stopper 10 regulates the vertical displacement of the box-shaped pack container A by contacting a part of the upper edge of the container, as will be described later. The gas supply source 6 supplies an antioxidant gas (for example, nitrogen, carbon dioxide, etc.) for preventing oxidation of liquid contents such as joules and liquors filled in the box-shaped pack container A. After the antioxidant gas supplied from the gas supply source 6 is guided to the base body 4a of the elevating body 4 through the gas flow path 11a, the gas flow path 11b formed inside the base body 4a and the base body 4a and the elevating head 8 are guided to the elevating head 8 through a gas supply pipe 11c (also referred to as “gas flow path 11c”) that connects the elevating head 8 to each other. The flow control valve 7 is provided in the middle of the gas flow paths 11a to 11c (for example, in the gas flow path 11a), and controls the flow rate of the antioxidant gas by opening and closing the valve.

  FIG. 2 is a perspective view of the lifting head 8. The lifting head 8 is a plate-like member having a substantially square surface shape corresponding to the opening shape of the box-shaped pack container A. This head surface is formed slightly smaller than the upper opening with a predetermined clearance in order to facilitate insertion into the box-shaped pack container A. A pair of support rods 4 b are attached to the upper surface of the elevating head 8, and a gas supply pipe 11 c is attached between these support rods 4 b and substantially at the center of the elevating head 8. An introduction port 8a penetrating the upper and lower surfaces is provided at substantially the center of the lifting head 8, and the introduction port 8a communicates with the gas supply pipe 11c. Further, in the present embodiment, a part of the outer edge of the elevating head 8 is notched, thereby providing a notch portion 8b as a through hole penetrating the elevating head 8 in the vertical direction.

  FIG. 3 is a main part explanatory view of the filling device 1 around the upper opening of the box-shaped pack container A. FIG. In the figure, the direction in which the cap B is attached is defined as the front, and the front, rear, left and right are defined based on this direction. A stopper 10 is provided on a part of the upper edge of the box-shaped pack container A so as to face it. The stopper 10 extends from the outside to the inside of the box-shaped pack container A so as to intersect the upper edge of the box-shaped pack container A. As shown in FIG. 6, when the lifting head 8 inserted into the container is lifted in a state where the upper opening is half-closed by forming a fold in the box-shaped pack container A, the lifting head 8 is half-closed. The box-shaped pack container A is also lifted by being caught in the upper opening and following the lifting head 8. However, since the upper edge of the container comes into contact with the stopper 10 and the vertical displacement of the box-shaped pack container A is restricted, only the lifting head 8 is raised while expanding the semi-closed upper opening. Thereby, the raising / lowering of the raising / lowering head 8 (extraction from the box-shaped pack container A) can be performed effectively, without causing the box-shaped pack container A to rise. Further, since the stopper 10 protrudes inside the box-shaped pack container A, the portion protruding inward becomes an obstacle when the lifting head 8 is engaged and disengaged. Therefore, in order to avoid interference with the lifting head 8, a notch 8 b is provided at a part of the outer edge of the lifting head 8, specifically, at a position corresponding to the stopper 10. The notch 8b functions as a through hole that penetrates the inside and outside of the container in a state where the elevating head 8 is inserted into the box-shaped pack container A.

  Although omitted in FIG. 1 for convenience of explanation, the outer jig 9 shown in FIG. 1 is actually a plurality of, around the box-shaped pack container A, specifically, as shown in FIG. Four are arranged corresponding to each side surface of the shape pack container A. The left and right outer jigs 9a and 9b are triangular plate-like members, and are attached to the respective rotation axes X1 and X2 so as to be rotatable. The front and rear outer jigs 9c and 9d are each constituted by a pair of L-shaped arms facing each other, and are rotatably attached to the respective rotation axes Y1 and Y2. These outer jigs 9a to 9d are attached to the movable body 4c shown in FIG. 1 via a link mechanism 4d. The movable body 4c is movably attached to the base body 4a via a spring 4e. When the movable body 4c is lowered against the urging force of the spring 4e by supplying hydraulic pressure or the like, the driving force is transmitted to the outer jigs 9a to 9d via the link mechanism 4d. 9a-9d rotates in the direction which closes inside a container. On the other hand, when the supply of hydraulic pressure or the like is stopped and the movable body 4c is raised by the restoring force of the spring 4e, the outer jigs 9a to 9d are rotated in the opposite direction and originally opened to the outside of the container. Return to the direction.

  As shown in FIG. 6, when forming a crease in the box-shaped pack container A, the four outer jigs 9a to 9d are rotated in the direction to close the inside of the container in a state where the elevating head 8 is inserted into the container. Let Thereby, the periphery of the upper edge of the container is pressure-deformed inside the container. Of the box-shaped pack container A, the portion below the lifting head 8 is held so as not to be crushed by the shape of the lifting head 8 itself, and only the portion above the lifting head 8 is deformed. . As a result, as shown in FIG. 6, a fold for closing the upper opening is formed on each side surface of the box-shaped pack container A. In terms of fold formation of the box-shaped pack container A, the elevating head 8 is an inner jig that is held from the inside of the container so that the box-shaped pack container A is not crushed during pressure deformation by the outer jigs 9a to 9d. Function. In addition, in order to efficiently form a beautiful crease, the surface itself of the box-shaped pack container A may be subjected to streak processing (thereby causing the surface fold to start from the streak portion). Good.

  Next, a manufacturing process using the filling device 1 according to the present embodiment will be described with reference to FIGS. 4 and 5. First, as shown in FIG. 4, the box-shaped pack container A is set on the mounting table 2. The set box-shaped pack container A is held by the side holder 3 or the like so that the position does not shift in the subsequent work process. In the state in which the box-shaped pack container A is set, the lift head 8 that is raised is located above the upper opening of the box-shaped pack container A.

  In this state, as shown in FIG. 5, the elevating head 8 is lowered, and the elevating head 8 is inserted into the container from the upper opening of the box-shaped pack container A. And using the raising / lowering head 8 as an inner side jig | tool, pressurizing and deform | transforming the circumference | surroundings of the container upper edge inside by the outer side jig | tool 9, hold | maintaining from the inner side so that the box-shaped pack container A may not be crushed. As a result, a fold for closing the upper opening is formed in the upper part of the side surface of the box-shaped pack container A. At the same time, when the lifting head 8 is inserted into the box-shaped pack container A, that is, when the upper opening is partially blocked without completely blocking the inside and outside of the box-shaped pack container A, An antioxidant gas is introduced into the container from an inlet 8a provided in the head 8.

  FIG. 6 is an explanatory view of the discharge of residual air accompanying the introduction of the antioxidant gas. When the antioxidant gas is introduced into the container from the introduction port 8a provided in the elevating head 8, the residual air in the container pushed out by this is discharged from the notch portion to the outside. Since most of the upper opening excluding the notch 8b is closed by the elevating head 8, the antioxidant gas introduced into the container is effectively stored in the container without leaking much outside. In addition, the introduction of the antioxidant gas is performed locally not through the entire upper opening but through the introduction port 8a, and the remaining air is discharged through the notch 8b that is offset from the introduction port 8a. Done through. Thus, by separating the inlet 8a and the notch 8b and introducing the antioxidant gas from a part of the box-shaped pack container A instead of the entire upper opening, the replacement of the remaining air with the antioxidant gas is performed. Can be performed efficiently. The gas in the container can be smoothly guided to the notch 8b without obstructing the gas flow inside the container, and the discharge of the remaining air by the notch 8b and the introduction of the antioxidant gas by the inlet 8a. This is because no collision occurs. Focusing on the replacement with the antioxidant gas, the lifting head 8 as an inner jig functions as a shielding part that partially shields the inside and outside of the box-shaped pack container A, and is a notch for avoiding interference with the stopper 10. 8b functions as a discharge part (non-shielding part) for discharging the remaining air to the outside.

  Thereafter, the lifting head 8 is raised. As described above, since the vertical displacement of the box-shaped pack container A is restricted by the stopper 10 that is in contact with the upper edge of the box-shaped pack container A, the lifting head 8 is expanded while expanding the semi-closed upper opening. Only rises.

  FIG. 7 is a diagram showing the opening / closing timing of the flow control valve 7. In the initial state in which the elevating head 9 is at the height up position, the flow control valve 7 is closed. Therefore, in this state, the antioxidant gas is not introduced. Next, after the elevating head 8 is lowered and the inlet 8a of the elevating head 8 (the lower surface of the elevating head 9) reaches the height H1 of the upper opening (including the arrival time), the flow control valve 7 Open the valve. Thereby, the introduction of the antioxidant gas from the introduction port 8a into the inside of the box-shaped pack container A is started. The introduction of the antioxidant gas is completed before the elevating head 8 positioned at the lowered position height Hdown rises and the introduction port 8a reaches the height H1 of the upper opening (including the arrival time). . By setting the opening / closing timing of the flow control valve 7 in this way, the amount of the antioxidant gas leaking to the outside can be minimized.

  Through the above-described series of processes, the formation of the folds in the box-shaped pack container A and the introduction of the antioxidant gas are simultaneously completed as one process using a single apparatus. In the subsequent process, after filling the box-shaped pack container A with the contents (fourth process), the main flow of the antioxidant gas by an appropriate method (for example, blowing of the antioxidant gas from above the container) The upper opening is sealed by bending the upper part of the container while performing (5th step). As a result, a sealed box-shaped pack container A filled with contents and the like is completed.

  As described above, according to the present embodiment, in the state where the elevating head 8 is inserted into the box-shaped pack container A, the inside of the container is filled with the antioxidant gas from the introduction port 8a. Since gas filling is performed in a state where a part of the upper opening is blocked by the elevating head 8, the antioxidant gas is exposed to the outside as compared with the conventional technique in which the antioxidant gas is blown from above the box-shaped pack container A. It is difficult to leak, and it is possible to improve the charging efficiency of the antioxidant gas (replacement efficiency of residual air).

  Moreover, according to this embodiment, the raising / lowering head 8 is used not only as an inner jig | tool for suppressing the cross-sectional deformation | transformation of the box-shaped pack container A but as a shielding member which controls that antioxidant gas leaks outside. Therefore, in the step of pressurizing and deforming the box-shaped pack container A, the antioxidant gas can be filled together. Therefore, it is not necessary to add a process for filling the antioxidant gas separately, so that productivity can be improved.

  Further, in the present embodiment, the notch 8b has a function of discharging the remaining air pushed out by the introduction of the antioxidant gas to the outside and a stopper provided for restricting the vertical displacement of the box-shaped pack container A. Therefore, it is possible to implement the filling function of the antioxidant gas while minimizing the modification of the existing apparatus.

  Furthermore, according to this embodiment, the flow rate control valve 7 is provided in the flow path of the antioxidant gas, and the opening / closing timing thereof is controlled so that the antioxidant gas does not leak outside more than necessary. it can. As a result, the working environment for the worker can be improved. The flow control valve 7 is not simply opened / closed, but can naturally be controlled to a higher degree including a half-open state.

  In the above-described embodiment, the example in which the inlet 8a is formed in the lifting head itself has been described. However, as illustrated in FIG. 8, the gas supply pipe 11c is extended downward so as to be lower than the lifting head 8. You may provide the inlet 8a so that it may be located. As a result, when a gas lighter than air (for example, nitrogen) is used as the antioxidant gas, the antioxidant gas is easily stored in the box-shaped pack container A by an amount corresponding to the downward direction of the introduction port 8a. Gas filling efficiency can be further increased. In this case, if an expansion / contraction type is used as the gas supply pipe 11c and the expansion / contraction amount is controlled in accordance with the elevation of the elevation head 8, an increase in the elevation amount (stroke) of the elevation head 9 itself can be suppressed.

  In the above-described embodiment, the description has been made on the premise that the existing crease forming apparatus for forming a crease at the upper part of the box-shaped pack container A has been described. However, the present invention is not limited to this. You may implement | achieve as a filling apparatus specialized only in the function which fills the inside of the pack container A with antioxidant gas. In this case, the outer jig 9 for forming a crease in the box-shaped pack container A is not necessary, and it is not necessary to cause the elevating head 8 to function as the inner jig. It is sufficient that only a function as a shielding member that partially shields the inside and outside of the container A is provided. At the same time, since the stopper 10 for holding the box-shaped pack container A is not necessarily required, the degree of freedom regarding the installation location of the discharge portion exemplified as the notch portion 8b is increased (in the above-described embodiment, the discharge portion is moved up and down). The reason why it is provided at the outer edge of the head 8 is solely due to the relationship with the stopper 10). In this case, the discharge part may be a through-hole penetrating the upper and lower surfaces of the lifting head 8 and penetrating the inside and outside of the container when the lifting head 8 is inserted into the box-shaped pack container A. The installation location may be offset from the introduction port 8a from the viewpoint of gas replacement efficiency.

  In addition, instead of the configuration in which the lifting head 8 itself has a through hole as a discharge portion for discharging the remaining air inside the box-shaped pack container A to the outside, the outer edge of the lifting head 8 and the inner wall of the box-shaped pack container A are used. You may use the clearance gap as a discharge | release part. For example, as shown in FIG. 9, the four corners of the elevating head 8 may be chamfered, and these non-shielding portions may be used as the discharge portion, or a plate shape slightly smaller than the transverse cross section of the box-shaped pack container A In the lifting head 8 having a gap, a gap (non-shielding portion) existing around the entire circumference of the lifting head 8 may be used as the discharge portion. This gap is at least a small one (clearance level) that allows the lifting / lowering head 8 to be taken in and out of the box-shaped pack container A.

  The present invention can be widely used for box-shaped pack containers filled with liquid contents such as juices and alcoholic beverages. In addition, as illustrated in the above-described embodiment, the upper opening is not limited to a box-shaped pack container called a “gable top type” in which the upper portion is formed in a gable plate shape, and an upper opening that can be sealed by folding the upper portion. The present invention can also be widely applied to box-shaped pack containers having various shapes (for example, prick packs).

DESCRIPTION OF SYMBOLS 1 Filling device 2 Mounting stand 3 Side holder 4 Elevating body 5 Elevating mechanism 6 Gas supply source 7 Flow control valve 8 Elevating head 8a Inlet 8b Notch 9 Outer jig 10 Stopper 11a-11c Gas flow path

Claims (8)

In the filling device for box-shaped pack containers,
A gas supply source for supplying an antioxidant gas for preventing oxidation of the contents in the box-shaped pack container;
An elevating head inserted into the box-shaped pack container from an upper opening that can be sealed by folding the upper part of the box-shaped pack container;
An inlet provided in the elevating head and for introducing the antioxidant gas supplied from the gas supply source into the box-shaped pack container;
In the state where the lifting head is inserted into the box-shaped pack container, the lifting head itself is provided as a through-hole penetrating the inside and outside of the box-shaped pack container, or the outer edge of the lifting head and the box-shaped pack A box provided as a gap with the inner wall of the container, and having a discharge portion for discharging the remaining air in the box-shaped pack container pushed out by introduction of the antioxidant gas from the introduction port. Filling device for shaped pack containers. A movable outer jig for forming a crease for pressing and deforming the upper edge of the box-shaped pack container inward to close the upper opening;
The elevating head is an inner jig for holding the box-shaped pack container from the inside so that the box-shaped pack container is not crushed during pressure deformation by the outer jig, and the opening shape of the box-shaped pack container The filling device for a box-shaped pack container according to claim 1, wherein the filling device has a surface shape corresponding to. A stopper that regulates the vertical displacement of the box-shaped pack container by projecting inside the box-shaped pack container and contacting a part of the upper edge of the box-shaped pack container;
3. The box shape according to claim 2, wherein the discharge portion is a cutout portion in which a part of an outer edge of the lift head is cut away in order to prevent the lift head from interfering with the stopper. Pack container filling device. A control valve provided in a flow path from the gas supply source to the inlet, and controlling a flow rate of the antioxidant gas;
The control valve opens after the elevating head is lowered and the introduction port reaches the height of the upper opening, the elevating head is raised and the introduction port is raised to the height of the upper opening. 4. The box-shaped pack container filling device according to claim 1, wherein the valve is closed before reaching the height. In the filling method of the box-shaped pack container,
Inserting an elevating head into the box-shaped pack container from the upper opening of the box-shaped pack container, and blocking a part of the upper opening without completely shielding the inside and outside of the box-shaped pack container. 1 step,
In the state where a part of the upper opening is closed by the elevating head, an antioxidant gas for preventing the oxidation of the contents in the box-shaped pack container is introduced into the box from the introduction port provided in the elevating head. A second step of introducing into the shaped pack container and discharging the air remaining in the box shaped pack container pushed out to the outside from an unshielded portion of the elevating head;
After the introduction of the antioxidant gas into the box-shaped pack container, after filling the box-shaped pack container with the contents, the upper opening of the box-shaped pack container is folded to seal the upper opening. And a third step of stopping. The second step includes
Using an outer jig, pressurizing and deforming around the upper edge of the box-shaped pack container,
Using the lifting head having a surface shape corresponding to the opening shape of the box-shaped pack container as an inner jig, the box-shaped pack so that the box-shaped pack container is not crushed during pressure deformation by the outer jig. The method for filling a box-shaped pack container according to claim 5, further comprising a step of holding the container from the inside. The second step includes
Further comprising the step of regulating the vertical displacement of the box-shaped pack container by bringing a stopper protruding inside the box-shaped pack container into contact with a part of the upper edge of the box-shaped pack container;
The remaining air is discharged by using, as the discharge portion, a notch provided by cutting out a part of the outer edge of the lift head in order to prevent the lift head from interfering with the stopper. The method for filling a box-shaped pack container according to claim 6. The second step includes
Starting the introduction of the antioxidant gas after the elevating head is lowered and the introduction port reaches the height of the upper opening;
8. The step of raising the elevating head and terminating the introduction of the antioxidant gas before the introduction port reaches the height of the upper opening. A method for filling a box-shaped pack container as described above.