JP2014118157A - Liquid filling method and device in bagging package - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid filling method and a device capable of preventing a bag mouth part from being deformed in the closing direction, and capable of preventing liquid filled in a bag from sticking to a seal expected part of the bag.SOLUTION: The liquid filling device comprises a liquid filling nozzle 22 having a downward discharge port 27 on the lower end and a gas jetting nozzle 31 having a gas jetting port 41 opening toward the side in the horizontal direction. The liquid filling nozzle and the gas jetting nozzle are lowered, the discharge port and the gas jetting port are put in a bag H, spraying on the seal expected part of the bag of pressurized gas is started simultaneously when starting filling of liquid or before it, and jetting of the pressurized gas is stopped simultaneously when stopping the filling of the liquid or by delaying from it.

Description

  In the present invention, a pair of left and right grippers that can be brought into contact with and separated from each other are used to hold both side edges of the bag, and the bag is held in a suspended state with the mouth portion facing upward, The present invention relates to a liquid filling method and apparatus in bag-filling packaging in which a liquid filling nozzle is inserted into a bag from the opened bag mouth and then filled with liquid, and then the mouth of the bag is sealed and sealed.

  In general bagging and packaging, prior to filling the liquid to be packaged, in the bag mouth opening process, the mouth of the bag is opened by an opening device composed of a pair of suction cups that can be separated from each other. The gripper holding both side edges of the bag is brought close to each other so that the shape of the opened bag mouth is maintained, which hinders the insertion of the liquid filling nozzle into the bag in the next liquid filling step. Is prevented from occurring.

  However, there is a case where the mouth of the bag is deformed in the closing direction during the filling of the liquid due to the impact on the bag accompanying the filling of the liquid or the shaking of the liquid filled in the bag. In such a case, since the liquid filling nozzle is inserted, the bag mouth is not completely closed, and the liquid filling operation itself is not hindered. However, since the inner surface of the bag mouth, that is, the part to be sealed to be sealed in the subsequent process, comes into contact with the liquid filling nozzle, the liquid filling nozzle rises after the liquid is filled and the liquid is filled when it exits from the bag mouth. There arises a problem that the liquid adhering to the vicinity of the discharge port of the nozzle adheres to the planned sealing portion.

  If liquid adheres to the planned sealing part of the bag, it will be sealed in a state where the liquid is biting in the sealing process, resulting in a problem that the desired sealing strength cannot be obtained, and also the appearance of the packaged product It becomes worse and must be discarded as a defective product.

  Even when the bag mouth portion does not deform in the closing direction, the liquid filled in the bag may splatter upward and adhere to the planned seal portion when filling the liquid.

  The above problems become more prominent as the filling time is short and the filling amount is large, that is, as the flow rate during filling increases.

  Therefore, conventionally, for example, as shown in Japanese Patent No. 3822148 and Utility Model Registration No. 3143150, a claw piece for maintaining the open state is inserted into the mouth portion of the opened bag, and in that state A method of inserting a liquid-filled nozzle was taken. However, this solves the problem caused by the bag mouth being deformed in the closing direction when the liquid is filled, but it is caused by the liquid filled in the bag being scattered upward. The problem cannot be solved.

  In addition, the liquid splashed upward may adhere to the nail piece inserted into the bag, and in that case, the liquid adheres to the part to be sealed when the nail piece is removed from the bag or inserted. A lot of defective products are generated.

  Further, in addition to the claw piece and a lifting device for raising and lowering the claw piece, a mechanism for opening and closing the claw piece is also required, so that the structure is complicated, the apparatus is enlarged, the cost is increased, and the cleaning property and the maintenance property are unavoidable.

  On the other hand, for example, as shown in FIG. 6 of Utility Model Registration No. 2569446, pressurized air is blown into the opened bag from above to maintain the opening state of the mouth portion when filling the package. Assistance has also been performed conventionally.

  However, such a configuration is not so much a problem even when the packaged item is a solid object, but when the packaged item is a liquid, the scattering of the liquid is promoted by the pressurized air blown into the bag. On the contrary, the adhesion of the liquid to the inner surface of the mouth portion of the bag, that is, the planned sealing portion becomes worse, and the reverse effect is obtained.

Japanese Patent No. 3822148 Utility Model Registration No. 3143150

The present invention has been made in view of the above-described problems of the prior art, and prevents the bag mouth portion from being deformed in the closing direction, and is intended to seal the bag even if the liquid filled in the bag is scattered upward. It is an object of the present invention to provide a liquid filling method and apparatus that can prevent liquid from adhering to a portion.

In order to solve the above-mentioned problems, the present invention is configured to grip both sides of a bag in a suspended state with a pair of gripping members, and transfer the bag along a predetermined track while facing the bag port upward. In the liquid filling method in the bagging and packaging that performs the opening of the liquid, filling the liquid material, and sealing the bag mouth,
A liquid filling nozzle insertion step of inserting a liquid filling nozzle having a liquid discharge port facing downward into a bag through an opened bag mouth, and positioning the discharge port at a predetermined height in the bag;
A gas injection nozzle having a gas injection port directed substantially horizontally is inserted into the bag through the opened bag port, and the gas injection port is inserted into the bag within the bag, A gas injection nozzle insertion step to be positioned below it;
A liquid filling step of filling a predetermined amount of liquid into the bag from the liquid filling nozzle;
At the latest, the gas injection is started at the same time as the discharge of the liquid from the liquid filling nozzle and the gas is sprayed toward the inner surface of the bag. At the earliest, the liquid is discharged from the liquid filling nozzle. A gas spraying process for stopping gas injection simultaneously with the stop;
A liquid filling method comprising:
In the liquid filling method, the gas may be ejected radially around the gas ejection nozzle in a plan view.
Further, in the liquid filling method, the gas may be ejected radially toward both sides of the bag and a portion excluding a predetermined range on both sides of the edge.
Furthermore, in the liquid filling method, air can be used as the gas.
Further, in the liquid filling method, the gas injection is stopped almost simultaneously with the liquid filling stop, and the liquid filling nozzle and the gas injection nozzle are raised together.
Further, in the liquid filling method, the liquid filling nozzle is pulled out from the bag after the liquid filling is finished, and then the gas injection from the gas injection nozzle is stopped to raise the gas injection nozzle. Can be configured.
Further, in order to solve the above problems, the present invention provides the following liquid filling apparatus. That is, it grips both side edges of the bag in a suspended state with a pair of gripping members, and while opening the bag mouth with the bag mouth facing upward, filling the liquid material, It is a liquid filling device for bagging and packaging that seals the bag mouth,
A liquid filling nozzle connected to a liquid supply source, provided with a liquid discharge port facing downward at the lower end, and provided so as to be movable up and down between an ascending end position and a descending end position;
A gas injection nozzle that is connected to the gas supply source and includes a gas injection port facing substantially in the horizontal direction, and is provided so as to be movable up and down between an ascending end position and a descending end position;
It has.
In the liquid filling apparatus, the gas injection nozzle is formed in an annular shape, and includes a gas flow path therein, and the gas injection port opens to an outer side surface of the gas injection nozzle and communicates with the gas flow path. It can be.
Furthermore, in the liquid filling apparatus, the gas injection port may be a plurality of slit-like openings extending in the horizontal direction.
Furthermore, in the liquid filling apparatus, the slit-shaped opening may be opened so as to face both side edges of the bag and a portion excluding a predetermined range on both sides of the edge.
Further, in the above liquid filling apparatus, the gas injection nozzle is formed in a substantially rod-like body extending in the vertical direction, and has a gas flow channel having a closed lower end inside, and a gas injection port communicating with the gas flow channel is provided on a peripheral wall. A plurality of the gas injection nozzles may be formed around the liquid filling nozzle.
Furthermore, in the liquid filling apparatus, the gas injection nozzles are provided on both sides of the liquid filling nozzle in the width direction of the bag, and the gas injection ports are formed on both sides of the peripheral wall in a direction substantially orthogonal to the bag width direction. It can be set as the structure which has.
Furthermore, in the liquid filling apparatus, air can be used as the gas.
Furthermore, in the liquid filling apparatus, the gas injection nozzle can be fixedly attached to the liquid filling nozzle.
Furthermore, in the liquid filling apparatus, the gas injection nozzle can be configured to move up and down independently of the liquid filling nozzle.
Further, in order to solve the above-mentioned problem, the present invention grasps both side edges of a bag in a suspended state with a pair of gripping members, and transfers the bag along a predetermined trajectory with the bag mouth facing upward. In a bagging and packaging machine that performs mouth opening, liquid filling, and bag mouth sealing, the bagging and packaging machine includes the liquid filling device described above in an intermittent rotary rotary bagging and packaging machine.

As described above, in the liquid filling method and apparatus according to the present invention, gas is blown before or at the same time as the filling of the liquid to the part to be sealed of the bag or a slightly lower position thereof, and during the filling of the liquid, Since attachment can be continued, the opening state of a bag mouth can be maintained. As a result, it is possible to prevent the bag mouth from being deformed in the closing direction even when there is an impact on the bag accompanying the filling of the liquid or a shake of the liquid filled in the bag.
In addition, an air curtain that closes the bag mouth can be formed by blowing a gas to a planned sealing portion of the bag or a position slightly below it. As a result, even if the filled liquid scatters upward, it can be repelled to the side or downward, and can be prevented from adhering to the planned sealing portion of the bag, and the occurrence of poor sealing in the subsequent process can be prevented.
Furthermore, since it is only necessary to provide an elevating type gas injection device, the structure can be simplified compared with the countermeasures conventionally taken, and advantages such as downsizing of the device, cost reduction, cleaning, and ease of maintenance can be obtained. It is done.
When the gas is blown onto the inner surface of the bag by spraying it in a radial direction in a plan view, the opening state of the bag mouth can be more reliably maintained, and an air curtain without a gap can be formed.
When the gas blowing is finished almost simultaneously with the completion of the liquid filling and the liquid filling nozzle and the gas injection nozzle are raised together toward the rising end position, the liquid can be filled efficiently and the structure can be further simplified. , Downsizing of the device, cost reduction, cleaning, ease of maintenance, etc. can be achieved.
After the liquid filling is completed, the liquid filling nozzle is raised, and after the liquid filling nozzle comes out of the bag, the gas blowing is finished, and the gas injection nozzle is raised, until the liquid filling nozzle comes out of the bag. It is possible to reliably prevent the liquid from adhering to the planned sealing portion of the bag.

It is a figure which shows the structure of the intermittent rotation type bagging and packaging machine using the liquid filling apparatus of this invention. The standby state of the liquid filling apparatus which concerns on 1st Embodiment of this invention is shown, (A) is a partial cross section front view, (B) is the AA sectional view taken on the line (A). FIG. 2 shows a filling state of the liquid filling apparatus of FIG. 2, (A) is a front view, and (B) is a cross-sectional view taken along line BB of (A). The standby state of the liquid filling apparatus which concerns on 2nd Embodiment of this invention is shown, (A) is a front view, (B) is CC sectional view taken on the line of (A). FIG. 5 shows a filling state of the liquid filling apparatus in FIG. 4, (A) is a front view, and (B) is a sectional view taken along line DD of (A). It is a perspective view which shows the liquid filling apparatus which concerns on 3rd Embodiment.

  The liquid filling method and apparatus of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a configuration of a bag filling and packaging machine provided with a liquid filling apparatus of the present invention. In the following description, an intermittent rotation type bagging and packaging machine in which a gripper for gripping a bag is attached to a table that rotates intermittently will be described as an example. However, the application of the present invention is not limited thereto, and the track of the gripper is only circular. Instead, a linear or racetrack type may be used, and the movement may be not only an intermittent rotation type but also a continuous movement type.

In the figure, reference numeral 1 is an intermittently rotating bagging and packaging machine (hereinafter simply referred to as “packing machine”), and a rotary table 2 (hereinafter simply referred to as “table 2”) that rotates intermittently in the direction of the arrow in the figure. I have. A pair of left and right grippers G, G are provided on the table 2 at a predetermined interval along the circumferential direction of the set. The grippers G, G hold both side edges of the bag H so that the bag H faces the bag mouth upward. The table 2 is held in a suspended state and is transferred along a circular orbit along with the rotation of the table 2. Various kinds of devices are provided by various devices appropriately provided at stations set at predetermined positions around the table 2. Bagging work is performed.

At station I, a bag supply process is performed. The bag H is a so-called flat bag in this example, but is not limited thereto, and may be a so-called self-standing bag, for example. Reference numeral 3 denotes a conveyor magazine, and the bags H are sequentially delivered from the conveyor magazine 3 to the grippers G and G by a bag feeding device provided with a pair of suction cups 4. In the station II, a printing process is performed, and the date of manufacture is printed using the printer 5. At the station III, a bag mouth opening process is performed. An opening device provided with suction cups 6 for opening the bag mouth is disposed at this station. A pair of suction cups 6 and 6 are positioned with the bag H in between, and after adsorbing to the sheets on both sides of the bag H, the bag mouth Ha of the bag H is opened by moving away from each other. Even when the suction cups 6 and 6 are separated from the bag H after the suction cups 6 and 6 have stopped adsorbing to the bag H and approach each other by a predetermined distance, the bag mouth Ha is kept open. In the station IV, the liquid filling process is performed by using the liquid filling apparatus 21 according to the present invention, which will be described later. Station V is empty and no special processing is performed, but here, the pair of left and right grippers G, G are separated from each other and tension the bag mouth Ha. In station VI, a primary seal of the bag mouth Ha is performed using a pair of hot plates 7 and 7, a secondary seal is performed using a pair of hot plates 8 and 8 in station VII, and a cooling discharge process is performed in station VIII. After the bag mouth Ha is cooled using the pair of cooling plates 9 and 9, the bag H as a product is discharged to the chute 10. Among the above, since a known apparatus can be used except for the liquid filling process in the station IV, further detailed description is omitted.

  Next, a liquid filling apparatus (hereinafter referred to as “filling apparatus”) according to the present invention will be described in detail with reference to FIG. FIG. 2 is an explanatory view of the filling device 21 according to the first embodiment of the present invention. FIG. 2A is a partial sectional front view in a standby state (ascending end position), and FIG. FIG. 3 is an explanatory view showing a liquid-filled state (falling end position), FIG. 3A is a front view, and FIG. 3B is a sectional view taken along the line BB of FIG. It is.

In FIG. 2, reference numeral 21 denotes a filling device arranged at the station IV shown in FIG. 1. Both side edges are sandwiched between grippers G and G, and the bag mouth Ha is opened at the station III in front of the station IV. It shows a state where the bag H that has been moved has moved down and stopped. Reference numeral 22 denotes a liquid filling nozzle, which is connected to a drive source (not shown) and can be moved up and down between a rising end position in FIG. 2 and a falling end position in FIG. The nozzle body 23 of the liquid filling nozzle 22 is connected to a liquid supply source (not shown) including a conventionally known valve, pump, tank, and the like via a line L1 (liquid pipe) connected to the inlet 25. . In the nozzle body 23, a piston 29 that moves up and down in the nozzle body 23 is arranged. In the standby state of FIG. 2, the piston 29 descends to close the inlet 25, and the discharge port 27 at the lower end of the nozzle body 23. Is also closed.

Reference numeral 31 denotes an annular gas injection nozzle that is fitted and fixed to the outer periphery of the nozzle body 23 of the liquid filling nozzle 22 in a central hole 33 at a position slightly above its lower end. 22 is moved up and down between the rising end and the falling end together. In the gas injection nozzle 31, there is a gas flow path 37 formed by hollowing out with a predetermined thickness, leaving two remaining portions 35, 35 facing each other in the width direction of the bag H at the approximate center in the thickness direction. Is provided. This cutout leads to the central hole 33, and the inner wall of the gas flow path 37 is constituted by the outer periphery of the liquid filling nozzle 22. However, the gas flow path 37 may be completely formed in the gas injection nozzle 31 while leaving a wall around the hole 33. The gas flow path 37 includes branch lines L21 and L22 connected to gas intake ports 39 and 39 extending upward inside the remaining portions 35 and 35, and a line L2 (L21, L2) where they are joined together. L22 and L2 are both connected to a gas pipe). The line L2 is connected to a gas supply source (not shown) via a switching valve (not shown). Between the above-mentioned two remaining portions 35, 35, the outer peripheral side of the gas injection nozzle 31 is opened in a slit shape to form gas injection ports 41, 41. From here, as will be described later, the pressurized gas is injected radially. In the present embodiment, pressurized air is used as the pressurized gas. However, for example, nitrogen gas can also be used for the purpose of gas replacement. In the present embodiment, the air is pressurized air, but it is not necessarily pressurized. The same applies when other gases are used. Although the gas injection nozzle 31 has been described as an annular shape, the gas injection nozzle 31 is not necessarily a complete annular shape, and includes a case where a part of the gas injection nozzle 31 is formed in a C shape. However, in that case, both ends are closed.

FIG. 3 shows a state where the liquid is filled as described above. That is, the liquid filling nozzle 22 and the gas injection nozzle 31 are lowered together from the state of FIG. 2 and are positioned at the respective lower end positions, and the discharge port 27 of the liquid filling nozzle 22 and the gas injection port 41 of the gas injection nozzle 31. Is in the bag H. The discharge port 27 is located below the gas injection port 41. In the present embodiment, the gas injection port 41 is located near the bag mouth Ha of the bag H in the height direction, that is, at a position corresponding to the planned seal portion Hb to be sealed in a subsequent process in the height direction. Further, it may be located slightly below the planned sealing portion Hb.

When the liquid filling nozzle 2 2 and the gas injection nozzle 31 reach the lower end position, the piston 29 rises to the position shown in the nozzle body 23, and opens the discharge port 27 and then the inlet 25. Thereby, the liquid is discharged from the discharge port 27 and filled into the bag H. At that time, the filling of the liquid by the liquid filling nozzle 22 is started, or slightly before that, the injection of the pressurized gas by the gas injection nozzle 31 is started. When a predetermined amount of liquid is filled, the piston 29 descends and closes the inlet 25 and the outlet 27 of the liquid filling nozzle 22. At that time, the injection of the pressurized gas from the gas injection nozzle 31 is stopped simultaneously with or slightly after the stop of the filling by the liquid filling nozzle 22. Thereafter, the liquid filling nozzle 22 and the gas injection nozzle 31 are extracted from the bag H and moved to the rising end.

As described above, while the liquid is filled into the bag H by the liquid filling nozzle 22, the pressurized gas is ejected radially laterally from the gas ejection port 41 of the gas ejection nozzle 31 in a substantially horizontal direction. Sprayed toward the inside. In the present embodiment, since the remaining portion 35 is provided, the gas injection port 41 is not open facing both side edges of the bag H and the predetermined range on both sides of the bag H. Although the gas is not directly blown toward those portions, the gas blown from the gas injection port 41 to the portion facing the gas injection port 41 on the inner surface of the bag H flows up and down along the inner surface of the bag H. At the same time, since it also flows to the edge sides on both sides of the bag H, an air curtain that closes the bag mouth Ha is formed at a portion to be sealed of the bag H or a position slightly below it. Therefore, even if the liquid filled in the bag H splashes upward, it is prevented from splashing sideward or downward by the air curtain and adhering to the scheduled seal portion Hb of the bag H. Further, when the bag mouth Ha of the bag H is opened, the grippers G and G sandwiching the side edges act so as to approach each other and maintain the opening state of the bag mouth Ha, as described in the description of the background art. As described above, the bag mouth Ha may be deformed in the closing direction, but in this embodiment, the pressurized gas is blown onto the inner surface of the bag H as described above in the liquid filling process, The open state is reliably maintained. The spraying of the pressurized gas is finished almost simultaneously with the end of the liquid filling, and the liquid filling nozzle 22 and the gas injection nozzle 31 are raised together to the rising end position.

4 and 5 show a liquid filling apparatus 51 according to the second embodiment of the present invention, which corresponds to FIGS. 2 and 3, respectively. It is a CC line sectional view and a DD line sectional view. Since the second embodiment is different from the first embodiment in the configuration of the gas injection nozzle 53, the same members as those in the second embodiment are denoted by the same reference numerals and detailed description thereof will be given. Is omitted.

  The liquid filling nozzle 22 used in this embodiment is the same as that in the first embodiment, and includes a nozzle body 23 and a piston 29. On the other hand, the gas injection nozzle 53 used in this embodiment is not in the form of a ring but in the form of a hollow bar extending up and down. And it is arrange | positioned in the symmetrical state near the both sides of the liquid filling nozzle 22 seeing in the width direction of the bag H. That is, these two gas injection nozzles 53, 53 are inserted and fixed in attachment holes 65, 65 provided on both sides of the center hole 63 of the attachment block 61 attached to the liquid filling nozzle 223 in the center hole 63. Yes. The lower ends of the gas injection nozzles 53, 53 are closed, and the gas injection nozzles 53, 53 have gas injection ports 55 opened to the peripheral wall on both sides in the direction orthogonal to the width direction of the bag H, as shown in the drawing. , 55 are formed two apart from each other in the vertical direction. Since the other configuration of the liquid filling device 51 is the same as that of the liquid filling device 21 of the first embodiment, the description thereof is omitted. The operation of the liquid filling apparatus 51 of this embodiment is the same as that of the liquid filling apparatus 21 of the first embodiment described above, and therefore the description thereof is omitted.

FIG. 6 is a perspective view showing a liquid filling apparatus 71 according to the third embodiment of the present invention. The liquid filling nozzle 22 used in this embodiment is the same as the liquid filling nozzle 22 used in the first and second embodiments. Further, the gas injection nozzles 73 and 73 used in this embodiment are substantially the same as the gas injection nozzles 53 and 53 used in the second embodiment, but the gas injection port 75 of the bag H is the same. It differs in that it is also provided toward both side edges.

The third embodiment differs greatly from the first and second embodiments in that the liquid filling nozzle 22 and the gas injection nozzles 73 and 73 are configured to move up and down separately. That is, a stand 77 is provided upright on a machine base (not shown), and a hollow shaft 79 that is connected to a drive source (not shown) and moves up and down is supported by the stand 77. Then, mounting blocks 83 and 83 to which gas injection nozzles 73 and 73 are respectively fixed are attached to a gas injection nozzle mounting plate 81 fixed to the hollow shaft 79 and formed in an L-shape with two plates. Positioned on both sides of the liquid filling nozzle 22 in the width direction of H, the hollow shaft 79 is raised and lowered, so that the gas injection nozzles 73 and 73 are raised and lowered between the rising end position and the falling end position. A lifting shaft 85 is inserted into and supported by the hollow shaft 79, and a lower portion thereof is connected to a driving source (not shown) so as to move up and down. A liquid filling nozzle mounting plate 87 that supports the liquid filling nozzle 22 is fixed to the lifting shaft 85. Thereby, the liquid filling nozzle 22 moves up and down.

  The operation of the liquid filling apparatus 71 of the third embodiment will be described. When the bag H is transferred to the station IV and stopped, the liquid filling nozzle 22 and the gas injection nozzles 73 and 73 are simultaneously moved from the rising end position to the falling end position, as in the first and second embodiments. In this embodiment, the gas injection nozzles 73 and 73 are first lowered to start injection of the pressurized gas. Then, after the spraying on the inner surface of the bag is started, the liquid filling nozzle 22 may be lowered to start filling the liquid. In this case, since the discharge port 27 of the liquid filling nozzle is located below the gas injection port 75 of the gas injection nozzle 73, the discharged liquid is not blown away by the pressurized gas to be injected.

When the filling of the liquid is completed, the injection of the pressurized gas is stopped at the same time or slightly behind the same as in the first and second embodiments, and the liquid filling nozzle 22 and the gas injection nozzles 73 and 73 are simultaneously operated. The liquid filling nozzle 22 may be moved toward the rising end position after the completion of the liquid filling, and then pressurized at an appropriate timing after the liquid filling nozzle 22 is extracted from the bag mouth Ha. You may make it complete | finish the blowing of gas and move the pressurized gas injection nozzles 73 and 73 to a raise end position.

  In addition to the above, various types of liquid filling nozzles and gas injection nozzles can be used. For example, in the first embodiment, the gas injection port 41 of the gas injection nozzle 31 is formed in an elongated slit shape, but the remaining portion 35 is left over the entire circumference, and small holes are provided there over the entire circumference. They may be formed side by side at intervals. In the latter case, since the pressurized gas is blown over the inner surface of the bag over 360 degrees, the air curtain is reliably formed over the entire bag mouth. However, in this case, the pressurized gas blown to and near the edge of the bag acts to pull the central portion of the bag in the width direction toward the edge, and the pressurized gas blown to the central portion. There is a possibility that the action of trying to keep the pressurized gas bag mouth open is somewhat obstructed. In the case of the first embodiment, since the pressurized gas is not directly sprayed on the edge portion of the bag and the predetermined range on both sides thereof, this is not the case. Even in this case, as described above, the pressurized gas blown toward the center flows along the inner surface of the bag toward the edge of the bag, so that a complete air curtain is formed. Also in the case of the second embodiment, the gas injection ports 55 may be provided toward the vicinity of both side edges of the bag H. That is, even if the filled liquid scatters, a sufficient air curtain is formed to prevent it from adhering to the planned sealing portion of the bag, and it is sufficient that the two nozzles that enter and exit the bag are not in contact with each other. It is only necessary to maintain an open state. Various timings are also possible for the start and end of liquid filling, the start and end of pressurized gas injection, and the timing of lowering and rising of each nozzle. What is necessary is just to be able to prevent the adhesion of the liquid, which is an object to be packaged, to the sealing target portion, which is the object of the present invention, and maintain the opening state of the bag mouth.

  In addition, although the case where the bag is intermittently transferred has been described above, in the case of continuous transfer, the above-described processing is performed while the liquid filling nozzle and the gas injection nozzle follow the bag over a predetermined liquid filling process section. After applying, it may be configured to return to the initial position.

Claims (16)

While holding the side edges of the bag in a suspended state with a pair of gripping members and transporting the bag along a predetermined trajectory with the bag mouth facing upward, the bag mouth opening, liquid filling, In the liquid filling method for bagging and packaging for sealing,
A liquid filling nozzle insertion step of inserting a liquid filling nozzle having a liquid discharge port facing downward into a bag through an opened bag mouth, and positioning the discharge port at a predetermined height in the bag;
A gas injection nozzle having a gas injection port directed substantially horizontally is inserted into the bag through the opened bag port, the gas injection port in the bag, above the discharge port, And a gas injection nozzle insertion step to be positioned at a position below the planned sealing portion of the bag or below,
A liquid filling step of filling a predetermined amount of liquid into the bag from the liquid filling nozzle;
At the latest, the gas injection is started at the same time as the discharge of the liquid from the liquid filling nozzle and the gas is sprayed toward the inner surface of the bag. At the earliest, the liquid is discharged from the liquid filling nozzle. A gas spraying process for stopping gas injection simultaneously with the stop;
A liquid filling method comprising: 2. The liquid filling method according to claim 1, wherein the gas is ejected radially around the gas ejection nozzle in a plan view. 3. The liquid filling method according to claim 2, wherein the gas is ejected radially toward both sides of the bag and a portion excluding a predetermined range on both sides of the edge. . 4. The liquid filling method according to claim 1, wherein the gas is air. 5. 5. The liquid filling method according to claim 1, wherein the gas injection is stopped substantially simultaneously with the liquid filling stop, and the liquid filling nozzle and the gas injection nozzle rise together. A liquid filling method. 5. The liquid filling method according to claim 1, wherein after the liquid filling is finished, the liquid filling nozzle is pulled out from the bag, and then the gas injection from the gas injection nozzle is stopped. The liquid injection method is characterized by raising the gas injection nozzle. While holding the side edges of the bag in a suspended state with a pair of gripping members and transporting the bag along a predetermined trajectory with the bag mouth facing upward, the bag mouth opening, liquid filling, In a liquid filling apparatus for bagging and packaging for sealing,
A liquid filling nozzle connected to a liquid supply source, provided with a liquid discharge port facing downward at the lower end, and provided so as to be movable up and down between an ascending end position and a descending end position;
A gas injection nozzle that is connected to the gas supply source and includes a gas injection port facing substantially in the horizontal direction, and is provided so as to be movable up and down between an ascending end position and a descending end position;
A liquid filling apparatus comprising: The liquid filling apparatus according to claim 7, wherein the gas injection nozzle is formed in an annular shape and includes a gas flow path therein, the gas injection port opens on an outer side surface of the gas injection nozzle, and the pressurized gas flow A liquid filling apparatus, characterized in that it leads to a path. 9. The liquid filling apparatus according to claim 8, wherein the gas injection port is a plurality of slit-like openings extending in a horizontal direction. ,
The liquid filling apparatus according to claim 9, wherein the slit-shaped opening is opened to face both side edges of the bag and a portion excluding a predetermined range on both sides of the edge. Liquid filling device. 8. The liquid filling apparatus according to claim 7, wherein the gas injection nozzle is formed in a substantially rod-like body extending in the up-down direction, and has a gas flow path having a closed lower end inside, and a gas communicated with the gas flow path on a peripheral wall. The liquid filling apparatus according to claim 1, wherein an ejection port is formed, and a plurality of the gas ejection nozzles are provided around the liquid filling nozzle. 12. The liquid filling apparatus according to claim 11, wherein the gas injection nozzle is provided on both sides of the liquid filling nozzle in the width direction of the bag, and the gas injection port is provided on both sides of the peripheral wall in a direction substantially orthogonal to the bag width direction. A liquid filling apparatus, characterized in that the liquid filling apparatus is formed. The liquid filling apparatus according to any one of claims 7 to 12, wherein the gas is air. 14. The liquid filling apparatus according to claim 7, wherein the gas injection nozzle is fixedly attached to the liquid filling nozzle in a state where the discharge port is positioned below the gas injection port. A liquid filling apparatus characterized by the above. 14. The liquid filling apparatus according to claim 7, wherein the gas injection nozzle moves up and down independently of the liquid filling nozzle. While holding the side edges of the bag in a suspended state with a pair of gripping members and transporting the bag along a predetermined trajectory with the bag mouth facing upward, the bag mouth opening, liquid filling, A bag filling and packaging machine for performing sealing, wherein the bag filling and packaging machine is an intermittent rotary type bag filling and packaging machine, and includes the liquid filling device according to any one of claims 7 to 15. Bagging and packaging machine.

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