JP4912022B2 - Vertical packaging machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a technique for manufacturing a packaging bag (bag-packed product) by forming a long sheet-like film into a bag shape and introducing food or the like into the film. The present invention relates to a packaging machine that can be replaced.

  2. Description of the Related Art Conventionally, as a packaging machine for bagging potato chips, bonito, etc., one having a configuration as shown in FIG.

  9 is roughly composed of a film feeding mechanism 112 and a bag making mechanism 113, and a long sheet-like film 110 pulled out from the film feeding mechanism 112 is formed on the bag making mechanism 113 side. It is formed in a bag shape so that the package 122 is continuously manufactured.

  More specifically, the bag making mechanism 113 includes a bag making guide 114 that folds the film 110 into a cylindrical shape, and a vertical seal device 116 that thermally seals both side edges of the film formed into a cylindrical shape by the bag making guide 114. Have. An endless belt-type film feeding device 118 is disposed near the vertical sealing device 116, so that a tubular film 110 (also referred to as a “tubular film”) is fed downward. ing.

  The horizontal sealing device 120 is disposed further below the film feeding device 118 and the like, and includes a pair of members so that the cylindrical film can be heat-sealed in the horizontal direction (width direction). One of the pair of members is provided with a cutter 130, whereby the package 122 is cut from the tubular film.

  An injection pipe 104 and a gas supply pipe 132 are disposed inside the cylindrical film. A hopper 106 is provided on the top of the charging pipe 104, and the contents are supplied from the hopper 106 into the film. More specifically, as shown in FIG. 10, the gas supply pipe 132 is a relatively thin pipe extending in the vertical direction along the inner peripheral surface of the cylindrical charging pipe 104, and nitrogen gas is supplied from the opening 134 at the lower end thereof. Gas is sent out.

  The operation of the packaging machine configured as described above will be briefly described below. Note that the film 110 is set in a state as shown in FIG. 9 in advance, is formed into a cylindrical shape by the bag making guide 114, and is guided along the outer peripheral surface of the charging pipe 104. At the lower end of the tubular film, the seal portion 110a formed by the previous bag making operation remains, and the tubular film has a bottomed shape.

  In such a state (see FIG. 9), first, nitrogen gas is supplied into the cylindrical film through the gas supply pipe 132. The supplied nitrogen gas is mixed with the air in the cylindrical film, and the mixed air is pushed out from the upper opening of the film, so that the residual oxygen concentration in the inside gradually decreases. In addition, in the state where gas is supplied in this way, the inside of the tubular film is at a positive pressure, and the tubular film is in a stretched state.

  Next, the contents of one bag are supplied from the hopper 106 through the charging pipe 104 into the cylindrical film. Since the supply of nitrogen gas is continued during this period, the air contained in the contents (for example, the air that existed between the individual pieces of potato chips) must also be removed. It becomes.

  Next, the horizontal sealing device 120 is operated to heat seal the cylindrical film to seal the upper side of the package 122, and the package 122 is cut from the film by the cutter 130. In this state, since the cylindrical film seal portion 110a is positioned at the height of the lateral seal device 120, the film feeder 118 is then operated for the next bag making operation, as shown in FIG. Pull the tubular film down to the position. Such a bag making operation for one bag is regarded as one cycle, and the packaging bag 122 is continuously manufactured by repeatedly performing the same steps as described above.

For example, Patent Document 2 discloses a packaging machine that performs gas replacement as described above. In the configuration of this document, as shown in FIG. 11, a gas supply pipe 232 is provided inside a charging pipe 204 provided so as to communicate with the hopper 206.
JP-A-10-53217 JP 2001-55206 A

  However, in the conventional configuration as described above, since the gas supply pipes 132 and 232 are configured as relatively narrow passages so as not to hinder the supply of the contents, a large amount of inert gas should be supplied in a short time. Then, the flow rate of the gas blown out from the supply pipe is inevitably increased. When the gas flow rate is high as described above, there is a possibility that the contents thrown into the cylindrical film may be swung up or the contents may not be thrown into the bottom. One way to prevent such problems from occurring is to supply an inert gas slowly, but this may also reduce productivity. In addition to the above, in the gas replacement, it is also important how to efficiently replace the air in the tubular film with an inert gas.

The present invention has been made in view of the above problems, and an object of the present invention is related to a packaging bag manufacturing apparatus that performs gas replacement before sealing a packaging bag. And it is providing the packaging machine which can perform gas substitution efficiently.

In order to solve the above-mentioned problems, the vertical packaging machine of the present invention is configured to remove the contents to be packaged from the upper opening of the cylindrical film through the cylindrical charging pipe into the bottomed cylindrical film. Content supply means to supply;
Gas supply means for supplying an inert gas for gas replacement into the cylindrical film through the gas supply passage;
In the vertical wrapping machine, the horizontal sealing means for sealing the upper opening of the tubular film after the contents are supplied into the tubular film,
The gas supply means includes a cylindrical member disposed outside the input pipe, and the gas supply passage is formed between an outer peripheral surface of the input pipe and an inner peripheral surface of the cylindrical member. And
The inside of the input pipe is a content supply path for transferring the content into the cylindrical film,
The content supply means includes
A shutter mechanism capable of closing the content supply path;
One end side communicates with the inside of the content supply path closed by the shutter mechanism, and the other end side communicates with the outside of the content supply path;
And a valve member for controlling opening and closing of the atmosphere opening passage.

  According to the present invention, since the gas is supplied into the cylindrical film through the gas supply passage formed between the input pipe and the cylindrical member, the following advantages can be obtained. That is, the gas supply passage in the present invention has an increased passage cross-sectional area as compared with the conventional configuration (configuration in which gas is supplied through a relatively thin tube) as shown in FIG. As a result, the delivery speed decreases, and the contents are less likely to rise. In addition, since a gas supply passage is provided outside the input pipe, the degree of freedom in layout of the passage is improved. Further, when an inert gas is supplied from the annular gas supply passage, there is an advantage that the gas can be well distributed into the cylindrical film.

  According to the present invention, the gas replacement is performed by supplying the inert gas from the annular gas supply passage. Therefore, as described above, the contents do not rise easily during the gas supply, and the gas replacement is efficiently performed. Can be performed.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view schematically showing the overall configuration of a vertical packaging machine according to the present invention, and FIG. 2 is a side view of the vertical packaging machine of FIG. 1 (the casing of the packaging machine is not shown). ).

  The packaging machine 1 basically has a bag-making guide 14 for folding a film 10 ′ drawn from the raw roll R into a cylindrical shape, and a film formed into a cylindrical shape by the bag-making guide 14, as in the conventional configuration. And a vertical seal device 26 for heat sealing (vertical seal) between both side edges. In the present specification, the film 10 ′ that has been vertically sealed by the vertical sealing device 26 is referred to as a “tubular film (10)”.

  Near the vertical sealing device 26 (see FIG. 2), a pair of endless belts 28A and 28B are arranged as the film feeding device 28, and by driving this, the film is conveyed downward. Yes. Each of the endless belts 28A and 28B is configured to be capable of moving forward and backward with respect to the tubular film 10, and is configured to be able to carry the film while adsorbing the film to the belt surface by suction force. .

  The lateral sealing device 20 is disposed further below the film feeding device 28, and includes a pair of members so that the upper opening of the tubular film can be heat sealed. As shown in FIG. 1, one of the pair of members is a heater bar 21 incorporating heating means (not shown), and the other is a receiving member 22 arranged to face the heater bar 21. Although not shown in detail, the receiving member 22 is provided with a cutter, and the packaging bag 115 manufactured by the cutter is cut from the tubular film 10.

  Next, the content supply mechanism 30 and the gas supply mechanism 50 which are the characteristic parts of the packaging machine 1 according to the present invention will be described. The main function of the contents supply mechanism 30 is to supply contents (for example, potato chips, bonito) to the inside of the cylindrical film. The main function of the gas supply mechanism 50 is to supply an inert gas such as nitrogen gas or argon gas into the cylindrical film.

  The content supply mechanism 30 includes a hopper 31 that temporarily stores a predetermined amount of content, and a charging pipe 52 provided below the hopper 31, and the content supplied to the hopper 31 is It is introduced into the cylindrical film through the content supply path 36 in the introduction pipe 52. The shape of the input pipe 52 may be an elliptical shape or a polygonal shape in cross section, but in this embodiment, it is cylindrical as shown in FIG.

  As shown in FIG. 2, a shutter mechanism 37 is provided below the hopper 31, and the lower end opening of the hopper 31 is opened and closed by the shutter mechanism 37. Specifically, as shown in FIG. 4 (top view), the shutter mechanism 37 has two shutter plates 39A and 39B arranged to face each other. Air cylinders 38A and 38B are used as drive sources for the shutter plates 39A and 39B, respectively. FIG. 4 shows a state in which the arms of the air cylinders are pushed out and the front ends of the shutter plates are in contact with each other (or the front end portions may partially overlap each other). In addition, since a pressure release pipe 45 is disposed in the content supply path 36, an escape portion 35 is formed in the shutter plate so as not to interfere with the pipe 45.

  The shutter mechanism 37 configured as described above can receive the contents of one bag supplied into the hopper 31 by the upper surfaces of the shutter plates 39A and 39B, thereby temporarily holding the contents. It is configured. By moving each shutter plate 39A, 39B to the retracted position, the held contents fall into the contents supply path 36.

  Referring to FIG. 1 again, the above-described pressure release pipe 45 is prepared as a pipe having a relatively small diameter, and one end side thereof (reference numeral 45a side) communicates with the inside of the content supply path. The end side (reference numeral 45b side) is open to the atmosphere outside the content supply path. In other words, each pipe 45 is provided so as to penetrate the shutter plate. Although not particularly limited, in the packaging machine 1, two pipes 45 are used, and these two pipes drawn to the outside are gathered together on the way to one, A valve member 48 is disposed on the passage.

  For example, an electromagnetic valve can be used as the valve member 48. By closing the valve member 48 with the shutter plates 39A and 39B closed as shown in FIG. 4, the inside of the content supply path 36 (that is, the cylindrical film 10) is almost sealed. By opening the valve member 48 with the shutter plates 39 </ b> A and 39 </ b> B closed, the inside of the tubular film 10 is released to the atmosphere through the pipe 45.

  The number of pipes 45 is not particularly limited, and may be one or three or more. As shown in FIG. 3A, it is preferable that the pipe 45 is disposed symmetrically with respect to a center line L passing through the center of the content supply path 36. Thereby, the pressure in the path 36 can be opened uniformly. In addition, when the number of the pipes 45 is one, the one pipe may be arrange | positioned so that it may be located in the center of the content supply path | route 36 (coaxially).

  Next, the gas supply mechanism 50 will be described. In the packaging machine 1, as shown in FIGS. 1 and 3, another cylindrical member 34 is arranged outside the input pipe 52, and the inner peripheral surface of the cylindrical member 34 and the outer peripheral surface of the input pipe 52 are A gas supply passage 56 is formed between the two. As shown in FIG. 3A, the cylindrical member 34 has a circular cross section and is disposed coaxially with the input pipe 52. Thereby, the cross-sectional shape of the gas supply path 56 is also annular. The lower end of the gas supply path 56 is a blowout port 56a, from which an inert gas is delivered.

As shown in FIG. 5 (a), the lower end height of the input pipe 52 and the lower end height of the cylindrical member 34 may be aligned, or the input pipe 52 may be formed as shown in FIG. 5 (b). It may be formed relatively short and the height of the lower end may be relatively high. Or as shown in FIG.5 (c), the cylindrical member 34 may be formed relatively short, and the height of a lower end may be relatively high. The width L ₅₆ of the gas supply path 56 is set to about 3 mm to 10 mm.

  Refer to FIG. 3 again. On the upper side of the gas supply passage 56 (more precisely, above the bag making guide 14 as shown in FIG. 1), a gas introduction port 51 for sending gas into the passage is provided. Although not particularly limited, as shown in FIG. 3A, in this embodiment, four introduction ports 51 are formed, and each introduction port 51 is arranged around the cylindrical member 34 at an equal pitch. ing. A gas supply hose (not shown) is connected to each inlet 51, and an inert gas is supplied through the hose.

  The operation of the packaging machine 1 of the present embodiment configured as described above will be described below with reference to FIGS. In addition, although it is not an essential difference, in FIG. 6, FIG. 7, the pipe 45 is shown as one.

  The state of FIG. 6A shows a state (initial state) at the time when the previous bag making operation is completed. A seal portion 10a is formed at the lower end of the tubular film 10, and the height of the seal portion 10a is increased. This is the height h1 of the horizontal sealing device 20. The shutter mechanism 37 is in a closed state, and the contents of one bag are supplied to the hopper 31.

  By closing the shutter mechanism 37 in this manner, the content supply path 36 is closed, and the inside of the tubular film 10 is sealed. However, the inside of the tubular film 10 is not completely sealed. For example, a slight gap is generated between the outer peripheral surface of the tubular member 34 and the inner peripheral surface of the film.

  In the state of FIG. 6A, an inert gas (nitrogen gas) is continuously supplied through the gas supply passage 56. Due to this gas supply, the inside of the tubular film is at a positive pressure, and the tubular film 10 is in a state having elasticity. As described above, the inside of the cylindrical film is not completely sealed, and the air (or inert gas) in the cylindrical film is discharged to the outside through the gap on the outer peripheral surface of the charging nozzle, for example. It has become.

  By performing the operation of FIG. 6A for a predetermined time, the air in the tubular film 10 is replaced with an inert gas, and the residual oxygen concentration inside decreases. Such a gas replacement operation is called “gas replacement”. After performing the gas replacement for a predetermined time, as shown in FIG. 6B, the shutter mechanism 37 is opened while the gas supply is continued, and the contents are put into the cylindrical film 10.

  Specifically, before the shutter mechanism 37 is opened, the valve member 48 is opened to release the pressure in the cylindrical film. This will be described with reference to FIG. As shown in FIG. 8, the valve member 48 is first opened while the shutter mechanism 37 is closed. As described above, since the inside of the cylindrical film is at a positive pressure by the supply of gas, simultaneously with the opening of the valve member 48, the gas (air) in the film is released to the outside through the pipe 45. As a result, the cylindrical film The pressure in the film drops momentarily.

  After releasing the pressure in this way, for example, 0.25 seconds after opening the valve member, the shutter mechanism 37 is opened, and the contents are put into the cylindrical film. In this way, the operation of first releasing the pressure and then opening the shutter mechanism 37 is effective when a relatively lightweight content such as a bonito is packed in a bag. That is, when the shutter mechanism 37 is opened while the inside of the tubular film is at a positive pressure, the gas (air) in the tubular film is sent to the outside at the same time as the shutter is opened. This is because there is a possibility of soaring. On the other hand, if the pressure is released prior to the charging of the contents as in the above method, such a problem does not occur. The time for opening the valve member 48 is not particularly limited, but may be 0.5 to 1.0 seconds as an example.

  When the charging of the contents is completed, the shutter mechanism 37 is then closed again as shown in FIG. The time during which the shutter mechanism 37 is opened may be set as appropriate depending on the amount of content to be input in one operation, the type of content, and the like. If it is. In FIG. 8, the valve member 48 is closed before the shutter mechanism 37 is closed. However, the present invention is not limited to this timing, and both mechanisms may be closed at the same time, or the valve member 48 may be relatively moved. It may be configured to be closed after a delay.

  Next, as shown in FIG. 7A, the tubular film 10 is conveyed downward by a predetermined distance until the sealing portion 10a of the tubular film reaches the height h2, while continuing to supply the gas. Specifically, this conveyance is performed by a pair of endless belts 28A and 28B. Since this step is performed with the shutter mechanism 37 and the valve member 48 closed, gas replacement is performed even during this transfer. In this step, the contents of one bag are supplied into the hopper 31 by a distribution mechanism (not shown).

  Next, as shown in FIG. 7B, the horizontal sealing device 20 is driven in a state where the gas supply is continued. Thereby, the seal | sticker part 10b is formed in the upper opening part of a cylindrical film. Here, since the sealing step is performed while the gas supply is continued, the packaging bag 15 has a firmness. When the packaging bag has elasticity as described above, for example, when the packaging bag is distributed, it is difficult to cause a problem that the contents are damaged due to an external impact. Similar to the conventional configuration, the packaging bag 15 is cut from the tubular film 10 by driving the cutter of the lateral sealing device 20.

  Although it is not an essential part, it is naturally possible to produce a wrapping-free packaging bag. In this case, for example, a pair of members sandwiching a tubular film is disposed below the lateral seal mechanism, and this The shape may be adjusted by sandwiching the tubular film between the members, and the final size of the packaging bag may be adjusted.

  One packaging bag 15 packed with contents is manufactured by the above-described series of steps, and continuous manufacturing of the packaging bag 15 is realized by repeating this step.

  According to the manufacturing method of the packaging bag which concerns on this invention demonstrated above, since an inert gas is supplied from the gas supply path 56 formed cyclically | annularly, the following advantages are acquired. That is, in the case of the annular gas supply passage 56, compared with a gas supply passage formed only in a part of the input pipe as shown in FIG. The speed is reduced. Therefore, since the inert gas is supplied relatively slowly, there is an advantage that the contents do not easily rise. When the contents soar, problems of biting of the contents into the seal portion are likely to occur. However, according to the present invention, such problems are also suppressed.

  In addition, the configuration in which the gas is supplied from the annular passage has an advantage that the gas can be spread into the cylindrical film better than the gas supply from one place as shown in FIG. Therefore, efficient gas replacement is performed, and the final residual oxygen concentration of the packaging bag 15 can be further reduced. Further, the fact that the gas supply passage is formed outside the input pipe is advantageous in that the degree of freedom in designing the passage 56 is improved.

  In addition to the above-described effects, in the manufacturing method according to the present invention, gas is supplied with the shutter mechanism 37 closed as shown in FIG. Yes. That is, when the shutter mechanism 37 is not closed, the inside of the cylindrical film is largely opened to the atmosphere through the content supply passage 36. Even if the gas is supplied in such a state, there is a problem that gas replacement is not performed efficiently because the outside air enters the cylindrical film through the content supply passage 36. On the other hand, in the manufacturing method according to the present invention, gas is supplied in a state where the content supply passage 36 is closed by the shutter mechanism 37, so that introduction of outside air into the tubular film is suppressed, and as a result, The gas replacement efficiency will be further increased.

  As described above, when the gas is supplied in a state where the content supply path 36 is closed, the inside of the cylindrical film becomes a positive pressure as described above. In this state, if the shutter mechanism 37 is opened (see FIG. 6B) to drop the contents, the contents may rise. However, in the manufacturing method according to the present invention, as described above, since the inside of the cylindrical film is first opened to the atmosphere and then the shutter mechanism 37 is opened, occurrence of such a problem is prevented.

  The soaring of the contents when the shutter mechanism is opened can be realized by, for example, temporarily stopping the gas supply. However, in this method of stopping the gas supply for each cycle, there is a concern that the cycle time for manufacturing the packaging bag may be delayed. ) Is more preferable. Thereby, shortening of cycle time is also realized.

  As mentioned above, although the manufacturing method of the packaging bag which concerns on this invention, and the packaging machine 1 for implement | achieving it were demonstrated, this invention can be variously changed besides the above. For example, a configuration in which a sensor capable of measuring the oxygen concentration is arranged at a position inside the tubular film 10 and the operation timing of each structural part of the packaging machine is generated based on the detection result of the sensor. It is good. An example of the sensor arrangement position may be the end of the pipe 45. According to such a configuration, for example, the shutter mechanism 37 is opened (see FIG. 6A) when the oxygen concentration in the cylindrical film becomes equal to or lower than a predetermined set value. Similarly, the driving timing of the horizontal sealing device 20 may be generated based on the detection result of the sensor.

  Or the detection result of the said sensor does not necessarily reflect in operation | movement of each structure part. When the detection result of the sensor becomes a predetermined set value (for example, the oxygen concentration is 10%) or more, an alarm may be displayed or the operation of the apparatus may be stopped. According to such a configuration, for example, when the supply of the inert gas is not normally performed for some reason, an alarm is displayed or the operation of the apparatus is stopped, so that the gas replacement is performed normally. There is no need to make a useless packaging bag 15.

  Next, as an embodiment of the present invention, an example in which bonito (shaving clause) bags are packed will be described. Here, the inner diameter of the charging pipe 52 was 211 mm, and the outer shape of the cylindrical member 34 was 200 mm. The packaging bag was a so-called pillow-shaped packaging bag, and its size was 340 mm × 360 mm (length × width).

Nitrogen (N ₂ ) is used as the inert gas, and the gas is continuously supplied without being stopped as described with reference to FIGS. The supply amount at this time is 350 L / min. In the process shown in FIG. 6B, the timing of driving the valve member 48 and the shutter mechanism 37 is as shown in FIG. 8. The valve member is opened, and the shutter mechanism 37 is opened 0.25 seconds later. Added the contents.

  Specifically, two types of contents were used: “Saba-Iwashi mixed” bonito and “Soda chopping”. The “saba-sardine mixed” bonito contains powdered contents, and among the two types, the bonito is relatively easily raised. The “Manda Sword-cut” is a material that has been thick-cut and is relatively difficult to soar.

  The supply of the contents to the hopper 31 was not performed using a distribution mechanism, but the worker supplied the contents into the hopper 31 each time. The amount of contents for one bag was 1000 g. Basically, 20 packaging bags are manufactured continuously in a single bag-making operation, and the first 10 bag contents are “Saba-Iwashi mixed” bonito, followed by the 10 bag contents. The thing was called “Soda shave”.

  The residual oxygen concentration was measured for each of the thus produced packaging bags. A zirconia oxygen meter (OXYGAN ANALYER “LC-700F”) manufactured by Toray Industries, Inc. was used for this measurement. Specifically, 30 cc of the gas in the packaging bag was sampled with a syringe, and this was supplied to the device for measurement.

  The measurement results are shown in Tables 1 to 5. Tables 1 to 5 show the results of repeating the same test, and basically there is no difference in the packaging machine and the inert gas used. As is clear from Tables 4 and 5, in the fourth and fifth rounds, only 10 packaging bags containing the bonito of “mackerel and sardine mixed” were produced.

  However, for the results of Table 4 performed for the fourth time, the pressure on the primary side of the packaging machine 1 (reading value in the pressure gauge provided in the vicinity of the gas inlet 51) was 3.7 to 4.5 MPa. In the first to third times (see Tables 1 to 3) and the fifth time (see Table 5), this value was about 5 Mpa, so it can be said that only the fourth test was slightly low pressure. Moreover, about the 1st time-the 4th time, bag making operation | movement was performed at the speed | rate of 12 bags / min. In contrast, the fifth time, the bag making operation was performed at a speed of 10 bags / min.

  As shown in Tables 1 to 5, in any packaging bag manufactured by the manufacturing method according to the present invention, the residual oxygen concentration was less than 0.3%. A standard value in the industry is a residual oxygen concentration of 0.5% or less with respect to a bag product of a shaving cut. Therefore, according to the method for manufacturing a packaging bag according to the present invention, it was proved that a highly reliable bag-packed product lower than the reference value can be manufactured. In addition, regarding the comparison of “Saba-Iwashi mixed” bonito and “Soda chopped chopsticks”, the “Soda chopped chopsticks”, which are relatively thick and have a relatively low rise, have a lower residual oxygen concentration.

It is a front view which shows roughly the whole structure of the vertical packaging machine which concerns on this invention. It is a side view of the vertical packaging machine of FIG. 1 (the casing of the packaging machine is not shown). It is a figure which shows the structure of the gas supply path periphery of the vertical packaging machine of FIG. 1, FIG. 3 (a) is a cross-sectional view in the AA cut line of FIG.3 (b), FIG.3 (b) It is a longitudinal cross-sectional view. It is a figure which shows the structure of a shutter mechanism, and is a top view of the packaging machine of FIG. It is a longitudinal cross-sectional view which shows some examples of a structure of the lower end of a gas supply path. It is process drawing for demonstrating the bag making operation | movement by the packaging machine of FIG. It is process drawing for demonstrating the bag making operation | movement by the packaging machine of FIG. It is a figure for demonstrating the timing of operation | movement of a valve member and a shutter mechanism. It is a perspective view which shows the basic composition of the conventional vertical packaging machine. It is a figure which shows the gas supply path in the packaging machine of FIG. It is a figure which shows the other example of the gas supply path in the conventional packaging machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Packaging machine 10 Cylindrical film 10a Sealing part 14 Bag making guide 20 Horizontal sealing apparatus 21 Heater bar 22 Receiving member 26 Vertical sealing apparatus 28A, 28B Endless belt 28 Film feeding apparatus 30 Contents supply mechanism 31 Hopper 34 Cylindrical member 35 Escape part 36 Contents Supply Path 37 Shutter Mechanism 38 Air Cylinder 39A, 39B Shutter Plate 45 Pipe 48 Valve Member 50 Gas Supply Mechanism 51 Gas Inlet 52 Input Pipe 56 Gas Supply Passage 56a Outlet

Claims (4)

Contents supply means for supplying the contents to be packaged from the upper opening of the cylindrical film through the cylindrical charging pipe into the bottomed cylindrical film,
Gas supply means for supplying an inert gas for gas replacement into the cylindrical film through the gas supply passage;
In the vertical wrapping machine, the horizontal sealing means for sealing the upper opening of the tubular film after the contents are supplied into the tubular film,
The gas supply means includes a cylindrical member disposed outside the input pipe, and the gas supply passage is formed between an outer peripheral surface of the input pipe and an inner peripheral surface of the cylindrical member. And
The inside of the input pipe is a content supply path for transferring the content into the cylindrical film,
The content supply means includes
A shutter mechanism capable of closing the content supply path;
One end side communicates with the inside of the content supply path closed by the shutter mechanism, and the other end side communicates with the outside of the content supply path;
And a valve member for controlling opening and closing of the air opening passage. The shutter mechanism includes a shutter plate configured to be movable back and forth with respect to the content supply path, and the atmosphere release passage is provided in a shape extending through the shutter plate. The vertical packaging machine according to claim 1 . The content supply means includes a hopper that temporarily stores the content of one bag, and the shutter plate is arranged at the bottom of the hopper so as to receive the content. The vertical packaging machine according to claim 2 . The vertical packaging machine according to any one of claims 1 to 3 , wherein the charging pipe and the cylindrical member are both cylindrical and are arranged coaxially with each other.

Images