JP2013212865A - Method and device for steam displacement/deaeration in bagging/packaging - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device for steam displacement/deaeration which are simply structured, surely and stably perform steam displacement/deaeration and prevent insufficient sealing, negative influences on characteristics of an item packaged, the pollution of a bag or a gripper, a failure of peripheral devices, the pollution of a packaging machine and the deterioration of work environments even if a bag is empty.SOLUTION: A sensor is provided for detecting whether a bag B is filled with an item to be packaged. When it is filled, only a first switching valve 49 is switched for a predetermined length of time to be in a communicating state for blowing steam from a steam supply source 45 into the bag through a nozzle 41 for steam displacement/deaeration. When filling is not detected, only the second switching valve 53 is switched for a predetermined length of time to be in a communicating condition for supplying steam to a steam collection pipe and then only the first switching valve is switched to be in a communicating condition for a time period shorter than the predetermined length of time for discharging from the nozzle residual water drops, etc. left between the first switching valve and the nozzle. The residue is collected by a residue collection mechanism 59.

Description

  The present invention relates to a steam replacement deaeration method and apparatus in bagging and packaging. More specifically, a pair of left and right grippers that can be separated from each other are sandwiched between both side edges of the bag, the bag is held in a suspended state in a vertical posture with the bag mouth facing upward, The present invention relates to a steam replacement deaeration method and apparatus for bagging and packaging in which a predetermined packaging process such as opening of a bag mouth, filling of an object to be packaged, sealing of a bag mouth is sequentially performed while being transferred along a moving track.

  When bagging food or the like, the air in the bag may be replaced with steam after the packaged material is filled, and deaerated. JP 2010-30601 A discloses an example of such a steam replacement deaeration device. In the apparatus, the sensor 26 is used to detect whether or not the packaged item is normally filled in the bag 20. If normal filling is not performed, the steam blowing nozzle 30 is swung in the vertical plane when the bag is transferred to the steam replacement deaeration process position, and the nozzle outlet is set in the bag. After being directed toward the intake cylinder 50 from the position with respect to the mouth, steam injected from the nozzle at a predetermined timing is sucked by the intake cylinder.

  As a result, since steam is not blown into the empty bag, control is performed to stop all the operations such as sealing the bag mouth in the subsequent process, and the empty bag is used again for packaging processing. It can be performed. Thereby, generation | occurrence | production of a defective bag can be prevented and efficient packaging is attained. However, the steam replacement deaerator disclosed in Japanese Patent Application Laid-Open No. 2010-30601 has the following problems.

  That is, even though the steam blown from the steam blowing nozzle is sucked by the intake cylinder, the amount of the steam that is blown is the same as the amount that is blown into the bag in which the package is normally filled. There is a considerable amount. For this reason, it is impossible to inhale all of them, and it is inevitable that steam will scatter to the surrounding area. Therefore, problems such as deterioration of the working environment, contamination of the packaging machine, and failure of peripheral devices arise. Moreover, since the hose 51 and the suction device 52 are required, the manufacturing cost is inevitably increased.

  Therefore, when the bag is empty, it is conceivable to switch the switching valve provided in the steam supply piping section from the communication state to the shut-off state to stop the steam blowing itself, but in that case, another problem arises. That is, with the interruption of steam blowing, the steam that was blown out at the previous blowing and slightly remained in the steam supply piping and the steam blowing nozzle downstream from the switching valve is naturally cooled and one of them. The portion becomes water droplets, which hangs down from the discharge port of the steam blowing nozzle and causes a problem that the bag or gripper is soiled. A dirty bag is a defective bag and cannot be reused. Also, if water droplets adhere to the gripper, the gripping force is adversely affected. In addition, even if it does not sag by accident, it will be blown into the bag together with the steam at the next time the steam is blown, so that the blown water drops will adversely affect the properties of the filled package, or the bag mouth And sticking to the seal portion on the inner surface of the inner surface of the inner surface of the inner surface of the inner surface of the inner surface may cause a sealing failure such as a so-called bite seal. In addition, the water droplets that are blown into the bag together with steam at the time of the next steam blowing, in addition to the water droplets in the steam supply pipe and the steam blowing nozzle downstream from the switching valve, with the interruption of steam blowing, Since water droplets generated by the stagnation of the steam flow on the upstream side of the switching valve are also included, the amount is extremely large.

JP 2010-30601 A

The present invention has been made in view of the above-described problems of the prior art, and can perform reliable and stable steam replacement and deaeration with a simple configuration, and the above-described conventional problems, that is, the bag is empty. Even in this case, the steam replacement deaeration method can prevent the occurrence of work environment deterioration, packaging machine contamination, peripheral equipment failure, bag and gripper contamination, adverse effects on the properties of the packaged items, sealing failure, etc. It is an object of the present invention to provide an apparatus.

In order to solve the above problems, the present invention provides a steam replacement deaeration method having the following configuration. That is, the method grips both side edges of a bag with a pair of left and right grippers, holds the bag in a vertical posture with the bag mouth facing upward, and transfers the bag along a predetermined movement trajectory in a horizontal plane. A steam replacement deaeration method in bagging and wrapping that packs a packaged item while including a detection step of detecting whether or not the packaged item is filled in the bag by a detection means, and the bag in the detection step When it is detected that the object to be packed is filled, the steam from the steam supply source is blown into the bag for a first predetermined time from the blowing nozzle through the steam supply pipe. , Performing a deaeration step of deaeration by replacing the air in the bag with steam, and if it is not detected in the detection step that the bag is filled with an article to be packaged, Steam from the steam source A steam recovery step of switching the steam flow through the supply pipe at a switching position provided in front of the blowing nozzle and injecting the steam into the steam recovery device for a second predetermined time, and then again the flow of the steam The steam is sprayed from the nozzle through the steam supply pipe for a time shorter than the first and second predetermined times, and the portion of the steam supply pipe downstream from the switching position and the nozzle The residue remaining inside is discharged from the nozzle and is recovered by a residue recovery device. The first and second predetermined times may be the same length.
In one embodiment, a plurality of pairs of the grippers are provided, a plurality of packaging processing stations are provided adjacent to each other along the moving track, and the degassing step and the steam collecting step include a plurality of packaging processes. The residue collecting step is performed after the transfer to the downstream station of the bag that has been stopped at the degassing station is performed while stopped at the degassing station that is one of the stations. And before the next bag from the next upstream station reaches the degassing station.
Moreover, in order to solve the said subject, this invention provides the steam substitution deaeration apparatus provided with the following structures. That is, the steam replacement deaeration apparatus grips both side edges of the bag with a pair of left and right grippers, holds the bag in a vertical posture with the bag mouth facing upward, and follows the predetermined movement trajectory in a horizontal plane. A steam replacement deaeration device in a bagging and wrapping machine that packs a packaged item while transferring the bag, a detection means for detecting whether the packaged item is filled in the bag, and a discharge port at the lower end A nozzle configured to be connected to a steam supply source via a steam supply pipe and configured to be movable up and down; a steam recovery pipe connected to the steam supply pipe near the nozzle; and the steam supply source A switching valve that is switched between a shut-off state that shuts off steam from the supply state, a supply state that leads to the nozzle, and a recovery state that leads to the steam recovery pipe, and a drive source, and is positioned below the nozzle. A residue collection member movable between a collection position to perform and a standby position away from a position below the nozzle, and a control device, the control device based on a signal from the detection means And the movement of the switching valve and the movement of the residue collecting member are controlled.
In one embodiment, the steam replacement deaerator further includes a protective cylinder member that encloses a predetermined portion of the nozzle in a sealed state to form a sealed space, and the sealed space is provided via a second steam supply pipe. Connected to a steam supply source, and the sealed space is further connected to a second steam recovery pipe.

The steam replacement degassing method of the present invention has the following effects by having the above-described configuration. That is, the method supplies steam to the steam recovery piping side even when the package is not filled in the bag, so that the portion of the steam supply piping from the steam supply source to the switching valve is provided at predetermined time intervals. Steam flows and is kept warm, and liquefaction of steam in this portion is prevented. And, when the bag is not filled with packaged items, a small amount of cold steam and water droplets that may be generated from the switching position to the nozzle are instantaneously injected with a small amount of steam. In this case, the steam is discharged from the nozzle and collected by the residue collecting member, so that the cooled steam or water droplets are not blown into the bag. In addition, since the steam injection is instantaneous and insignificant, even if it is scattered, the amount is very small compared to the conventional example, and the working environment is deteriorated, the packaging machine is contaminated, and peripheral equipment is broken. Such problems are prevented. Also, the water droplets that drip from the nozzle outlet will not contaminate the bag or gripper, and the water droplets will be blown into the bag the next time steam is blown, which will not adversely affect the properties of the package and will not cause a seal failure. .
After the residue collection process is started, the transfer of the bag that has been stopped at the degassing station to the downstream station is started, and the next bag from the adjacent upstream station reaches the degassing station. If it is done before, the residue is removed at the timing when there is no bag underneath, so the water drops that fall from the nozzle outlet will contaminate the bag and gripper. Is blown into the bag, and problems such as deterioration of the properties of the packaged items and poor sealing are reliably prevented.
As described above, the steam replacement deaerator of the present invention is provided with a steam recovery pipe that is branched and connected to the steam supply pipe near the nozzle, and from the detection means that detects whether or not the package is filled in the bag. Based on the signal, the control device controls the switching valve to switch between a state where the steam from the steam supply source is shut off, a state where the switching valve is supplied to the nozzle, and a state where the switching valve is supplied to the steam recovery pipe. When the package is filled with steam, steam is supplied to the nozzle only for a predetermined time to degas the bag. When the bag is not filled with the package, only the steam recovery pipe is used. The steam is supplied to the nozzle only for a predetermined time, and then the steam is instantaneously supplied only to the nozzle to discharge the residue such as water droplets in the portion of the steam supply pipe downstream of the switching means and the nozzle. Can be recovered in the residue recovery device, deterioration of the working environment, the packaging machine of pollution problems such as the peripheral equipment failure is prevented. Also, the water droplets that drip from the nozzle outlet will not contaminate the bag or gripper, and the water droplets will be blown into the bag the next time steam is blown, which will not adversely affect the properties of the package and will not cause a seal failure. .
The steam replacement deaerator further includes a protective cylinder member that encloses a predetermined portion of the nozzle in a sealed state to form a sealed space, and the sealed space is connected to a steam supply source via a second steam supply pipe When the sealed space is further connected to the second steam recovery pipe, the nozzle is always kept warm by the steam in the sealed space, and therefore exists in the steam supply pipe portion and the nozzle downstream from the switching valve. The prevention of steam droplets can be promoted, and the harmful effects of droplets can be reduced.

It is a schematic block diagram of the bagging and packaging machine provided with the steam substitution deaeration device of the present invention. It is a figure which shows schematic structure of the steam substitution deaeration apparatus of this invention, and has shown the state immediately after the bag judged that the to-be-packaged item was filled arrived at the steam substitution deaeration station. It is a figure which shows the state which the raising / lowering axis | shaft moved to the descent | fall end, and the discharge port of the nozzle was inserted in the bag. It is a figure which shows the state which is blowing steam in the bag. It is a figure which shows the state immediately before moving a raising / lowering axis | shaft to a raise end, extracting a nozzle from a bag, and moving a bag to the next station. It is a figure which shows the state of the steam substitution deaeration station in which the bag is not yet transferred when it is not detected that the to-be packaged object was filled. It is a figure which shows the state which act | operated the air cylinder and raised the nozzle to the retracted position. It is a figure which shows the state which the residue collection member moved to the collection position, and the bag reached | attained the steam replacement deaeration station. It is a figure which shows the state which is collect | recovering the steam from a steam supply source via a steam collection | recovery piping, while a raising / lowering shaft moves to a descending end. It is a figure which shows the state just before a raising / lowering axis raises and a bag is moved to the next station. It is a figure which shows the state which sprays a steam instantaneously and collects the residue with a residue collection member.

Hereinafter, a steam replacement degassing method and apparatus according to an embodiment of the present invention will be described with reference to the drawings. First, with reference to FIG. 1, the structure of the bagging and packaging machine 1 which uses the steam substitution deaeration apparatus of this invention is demonstrated.

  A bag filling and packaging machine (hereinafter simply referred to as a “packing machine”) 1 includes a known rotary table 3 that rotates intermittently, and the rotary table 3 holds bags B at equal intervals along the circumferential direction. A plurality of pairs of right and left grippers 5 and 5 for mounting are attached and moved intermittently along a predetermined track. In the present invention, the movement track of the grippers 5 and 5 is not limited to the circular track shown in the figure, and may be a straight line, a race track shape, or the like.

At the station I, a bag feeding process is carried out, in which a conveyor magazine 7 is installed, the bags B are taken out one by one by a pair of take-out suction cups 8 and their postures are converted into a vertical state to be grippers 5, 5 Delivered to As shown in the figure, the grippers 5 and 5 hold both side edges of the bag B, and hold the bag mouth (opening) in a suspended state in a vertical posture with the top facing upward. In the station II, a printing process is performed, and a printer 9 is provided to print the date of manufacture on the bag B. In the station III, an opening process is performed, and a pair of suction cups 11 for opening the bag mouth are provided here, and the bag mouth of the bag B is opened by contacting and separating from each other. In the station IV, a filling process is performed, and the package B is filled into the bag B through the guide hopper 13. Reference numeral 15 is a sensor for detecting an object to be packaged in the bag B, and is installed between the station IV and the station V. The sensor 15 determines that there is no packaged object not only whether the package B exists in the bag B but also when the bag B itself does not exist. In addition, as a sensor which detects a to-be-packaged object, it is not limited to the thing to detect the to-be-filled object in the bag B like this example, or the presence of a bag directly. For example, a configuration in which a sensor is installed in the station IV to detect whether or not an article to be packaged has passed through the guide hopper 13 can be employed. In the specification and claims of the present application, The concept of detecting the presence of a packaged item in the bag, including detecting the presence of a packaged item, detecting the absence of a bag, and detecting the filling of the packaged item in the bag. Include in The sensor 15 constitutes a part of a deaeration device 31 described later.

  In the station V, a deaeration process is performed, and a deaeration device 31 including a nozzle 41 for steam blowing, a residue recovery mechanism 59 for recovering residues such as water droplets in the nozzle 41 and the like is disposed. This will be described later. In the station VI, a pair of hot plates 17 and 17 are used for primary sealing of the bag mouth, and in the station VII, a pair of hot plates 19 and 19 are also used for secondary sealing of the bag mouth. In the last station VIII, the bag mouth is cooled using the pair of cooling plates 21 and 21, and then the bag as a finished product is discharged to the chute 22. Reference numeral 23 is a control device that controls the operation of the packaging machine 1 including a deaeration device 31 described later.

  Next, the configuration of the deaeration device 31 will be described with reference to FIG. In the figure, reference numeral 33 denotes an elevating shaft whose lower part is connected to a drive source (not shown) and moves up and down, and an air cylinder mounting plate 35 is fixed on one end side to the upper end side thereof. An air cylinder 37 is attached to the other end of the air cylinder attachment plate 35, and its rod 38 extends upward. A nozzle mounting plate 39 is fixed to the rod 38 on one end side, and a steam blowing nozzle (hereinafter referred to as “nozzle”) 41 is vertically mounted on the other end side with its discharge port 42 facing downward. As can be seen from the above, the nozzle 41 moves up and down as the elevating shaft 33 moves up and down and the rod 38 of the air cylinder 37 expands and contracts. In FIG. 2, the elevating shaft 33 is in the raised end position, and the rod 38 is in a contracted state.

Reference numeral 43 is a cylindrical heat retaining cylinder, which surrounds the periphery of the nozzle 41 except for its upper and lower ends, and forms a sealed space 44 around the nozzle 41. Reference numeral 45 denotes a steam source, which is connected to the nozzle 41 by a steam supply pipe 47. The steam supply pipe 47 is provided with a first switching valve 49 at a position close to the nozzle 41 so as to open and close communication between the steam supply source 45 and the nozzle 41. That is, steam is injected from the nozzle 41 when the first switching valve 49 is opened, and is not injected when the first switching valve 49 is closed.

The steam recovery pipe 51 branches off at a first branch point P1 of the steam supply pipe 47 before the first switching valve 49, and is connected to a steam recovery member (not shown). A second switching valve 53 is provided near the first branch point P1 on the steam recovery pipe 51 side, and opens and closes communication between the steam supply source 45 and the steam recovery pipe 51. Further, the second steam supply pipe 55 branches at the second branch point P2 upstream from the first branch point P1 and is connected to the inlet 43a provided on the upper end side of the heat retaining cylinder 43, so that the steam is always steamed into the sealed space 44. (See arrow in the figure) to keep the nozzle 41 warm. An outlet 43b is provided at the lower end side of the heat insulating cylinder 43, and the steam that has flowed into the sealed space 44 flows into a recovery member (not shown) via the second steam recovery pipe 56 (see arrow in the figure). ). Reference numeral 57 is a flow rate adjusting valve.

Reference numeral 59 denotes a residue collecting mechanism, which includes a horizontally disposed air cylinder 61 and a residue collecting member 63 attached to the tip of a rod 62 protruding in the horizontal direction. As will be described later, the residue collecting member 63 receives and collects water droplets discharged from the nozzle 41, and for example, a box-shaped member having an open top is suitable. However, the amount of water droplets to be discharged is very small, and may be a concave member or a plate-like member as long as it spontaneously evaporates. That is, it is only necessary to prevent slight steam and water droplets that are instantaneously ejected from the nozzles from adhering to the bag or gripper, as will be described later. The first switching valve 49 and the second switching valve 53 described above are connected to the control device 23, and the switching is controlled based on the signal from the sensor 15 described above. In addition, it replaces with the 1st switching valve 49 and the 2nd switching valve 53, uses one three-way valve, interruption | blocking of the flow of the steam from the steam supply source 45, supply to the nozzle 41, and the steam collection piping 51 The supply may be controlled.

Next, the operation of the deaeration device having the above configuration will be described. First, as the bag B that has been subjected to the filling process at the station IV moves to the station V, the presence or absence of an object to be packaged in the bag B is detected by the sensor 15 as described above. FIG. 2 shows a state immediately after the bag B that has been confirmed by the sensor 15 to be filled with an article to be packed reaches the station V and stops. The detection signal of the sensor 15 has already been sent to the control device 23. At this time, the first switching valve 49 and the second switching valve 53 are both shut off, but steam is always supplied to the sealed space 44 via the second steam supply pipe 55. When it is detected that the package B is filled in the bag B, as shown in FIG. 3, the elevating shaft 33 located at the ascending end position moves to the descending end position, and accordingly the nozzle 41 Is lowered, and the discharge port 42 is inserted into the bag B. (Note that the control device 23 and the steam supply source 45 are not shown in FIG. 3 and subsequent figures.) The first switching valve 49 is switched to the communication state before and after the elevating shaft 33 reaches its lower end. Thus, steam begins to be blown into the bag B from the discharge port 42 of the nozzle 41 (FIG. 4). On the other hand, the grippers 5 and 5 move in directions away from each other, and the bag mouth of the bag B is tensioned so as to adhere to the periphery of the nozzle 41. Then, after the steam is injected for a predetermined time, the first switching valve 49 is switched to the shut-off state, and then the lifting shaft 33 is moved to the rising end to remove the nozzle 41 from the bag mouth (FIG. 5). The upward movement of the elevating shaft 33 may be started while the steam blowing is continued. In this case, the steam blowing is stopped immediately before the discharge port 42 of the nozzle 41 comes out of the bag port. Like that. The elevating shaft 33 reaches the rising end to end the deaeration process, and the bag B deaerated before and after that is moved to the station VI.

Next, the case where it is detected by the sensor 15 that the package B is not filled in the bag B will be described with reference to FIG. FIG. 6 is a diagram showing an initial state at the station V. That is, both the first and second switching valves 49 and 53 are in a shut-off state, the elevating shaft 33 is located at the rising end, and the air cylinder 37 is in a state where the rod 38 is contracted. When it is detected by the sensor 15 that the bag B that is moving to the station V is not filled with an article to be packaged, the control device operates based on the signal, and the rod 38 of the air cylinder 37 is extended. The nozzle 41 is moved to the upper retracted position (FIG. 7). The nozzle 41 does not necessarily have to be moved to the retracted position. The nozzle 41 is not stopped as it is, or the discharge port 42 does not enter the bag mouth of the bag B to which the nozzle 41 moves, and a residue collecting member 63 to be described later. You may make it stop descent | fall in the position which does not prevent a movement. In short, any state that does not hinder the subsequent operation may be used.

Next, while the bag B moves to the station V and stops, the air cylinder 61 of the residue collection mechanism 59 is operated to extend the rod 62 so that the residue collection member 63 is positioned below the nozzle 41 (FIG. 8). Then, the elevating shaft 33 is moved to the lower end position. Further, the second switching valve 53 is switched from the shut-off state to the communication state, and the steam from the steam supply source 45 is sprayed to a drain groove or a water droplet collection box (not shown) through the steam collection pipe 51 (FIG. 9). The length of the spraying time is the same as the steam spraying time into the bag B described above. On the other hand, the first switching valve 49 is maintained in a shut-off state. And after injecting steam for the predetermined time, the 2nd switching valve 53 is switched to the interruption | blocking state (FIG. 10). Next, the lifting shaft 33 moves to the rising end, and the bag B starts moving to the next station VI. The time for supplying steam to the steam collection pipe 51 does not necessarily have to be the same as the time for supplying to the nozzle. As will be described later, until the next time steam is supplied to the nozzle 41 or the steam recovery pipe 51, the heat retaining effect is maintained so that steam liquefaction does not occur in the portions up to the switching valves 49 and 53 of the steam supply pipe. It only has to be done.

Next, the first switching valve 49 is switched to the communication state, and steam is instantaneously injected from the nozzle 41 for a time that is significantly shorter than the above-described blowing time into the bag B, that is, instantaneously (FIG. 11). The first switching valve 49 is returned to the shut-off state. Due to the instantaneous injection of steam, the portion of the steam supply pipe 47 downstream of the first switching valve 49 and the cooled steam and / or water droplets remaining in the nozzle 41 are blown out from the discharge port 42 to collect the residue. Collected by the member 63. That is, when the bag B is not filled with an article to be packaged, since steam is not blown into the bag B as described above, when steam is blown into the bag B last time, The portion of the steam supply pipe 47 downstream from the first switching valve 49 and the steam remaining in the nozzle 41 are compared with the case where steam is blown into the next bag B, and the steam supply pipe 47 and the nozzle 41. There is a possibility that it will naturally cool and liquefy. The cooled steam and the water droplets generated by liquefaction are ejected from the nozzle 41 by the instantaneous spray of steam and collected by the residue collecting member 63. After this recovery, the rod 38 of the air cylinder 37 contracts and the nozzle 41 returns to the standby position, and the rod 62 of the air cylinder 61 contracts and the residue recovery member 63 also returns to the original standby position.

  In the above example, the configuration in which the bag is intermittently transferred has been described. However, the present invention can also be applied to the case where the bag is continuously transferred. In this case, the nozzle is set to a predetermined section (steam replacement deaeration). It is configured to move so as to follow the transfer of the bag over the process section, and to return to the initial position after the follow-up movement (after the steam replacement degassing process).

Claims (5)

A pair of left and right grippers grips both side edges of the bag, holds the bag in a vertical posture with the bag mouth facing upward, and moves the bag along a predetermined movement trajectory in a horizontal plane. In the steam replacement degassing method in bagging and packaging,
A detection step of detecting whether the package is filled in the bag by detection means;
When it is detected in the detection step that the bag is filled with the article to be packaged, the steam from the steam supply source is discharged from the blowing nozzle through the steam supply pipe for a first predetermined time. Blowing into the bag, performing a degassing step of degassing by replacing the air in the bag with steam,
If it is not detected in the detection step that the bag is filled with an article to be packaged, a steam flow from the steam supply source through the steam supply pipe is provided in front of the blowing nozzle. The steam recovery step of switching at the switching position and injecting the steam into the steam recovery device for a second predetermined time, and then switching the flow of the steam again to be shorter than the first and second predetermined times. Steam is sprayed from the nozzle through the steam supply pipe for a period of time, and a portion downstream of the switching position of the steam supply pipe and the residue remaining in the nozzle are discharged from the nozzle, A steam replacement degassing method comprising: performing a residue recovery step of recovering with a material recovery device.   2. The steam replacement degassing method according to claim 1, wherein the first and second predetermined times are the same length. 3. The steam replacement deaeration method according to claim 1, wherein a plurality of pairs of grippers are provided, a plurality of packaging processing stations are provided adjacent to each other along the moving track, and the deaeration step and the steam recovery step are provided. Is performed while the bag is stopped at a degassing station that is one of the plurality of packaging processing stations, and the residue collecting step is performed to a downstream station of the bag that has been stopped at the degassing station. A steam replacement degassing method, characterized in that it is performed after the transfer towards the start is started and before the next bag from the next upstream station reaches the degassing station. A pair of left and right grippers grips both side edges of the bag, holds the bag in a vertical posture with the bag mouth facing upward, and moves the bag along a predetermined movement trajectory in a horizontal plane. In a steam replacement deaerator in a bagging and packaging machine that performs bagging,
Detecting means for detecting whether or not the package is filled in the bag;
A discharge port provided at the lower end, connected to a steam supply source via a steam supply pipe, and configured to be movable up and down;
A steam recovery pipe connected to the steam supply pipe near the nozzle; and
A switching valve that is switched between a shut-off state that shuts off steam from the steam supply source, a supply state that leads to the nozzle, and a recovery state that leads to the steam recovery pipe;
A residue collection member connected to a drive source and movable between a collection position located below the nozzle and a standby position away from the position below the nozzle;
A control device,
The control device controls the up-and-down movement of the nozzle, the switching operation of the switching valve, and the movement of the residue collection member based on a signal from the detection means;
A steam replacement deaerator. 5. The steam replacement deaeration device according to claim 4, wherein the steam replacement deaeration device further includes a protective cylinder member that surrounds a predetermined portion of the nozzle in a sealed state to form a sealed space, and the sealed space is a second space. The steam replacement deaerator is connected to a steam supply source via a steam supply pipe, and the sealed space is further connected to a second steam recovery pipe.

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