Gas-filled packaging machine

Abstract

To provide a chamber type gas filling packaging machine that can package items that tend to fly up such as flower bonito without sacrificing work efficiency.SOLUTION: In a state where a gas injection nozzle 43 is inserted through a bag mouth of a bag P, the bag mouth side is held between a bag receiver and a bag holder 33 to close the bag temporarily while leaving an opening K to be temporarily closed. The opening K is opposed to a nozzle mouth 43a. When vacuuming in this state, the outside of the bag P is preferentially suctioned, and the inside of the bag P is suctioned after a delay. The final degree of vacuum is almost the same on the inside and outside of the bag P, though this delay causes the bag P to expand, and the vacuuming is terminated. Next, when blowing an inert gas into the inside of the bag P, even if it is carried out at a certain blowing speed, the bag P is expanded and its capacity is increased, so the inert gas can easily go around to every corner of the bag P, and the flying-up of flower bonito F is suppressed. The gas injection nozzle 43 is retreated and after it is taken out of the bag mouth, the bag P is sealed.SELECTED DRAWING: Figure 9

Description

Technical Field

[0001] The present invention relates to gas-filled packaging that enables long-term preservation by holding foods, etc. in an inert gas to block oxygen.

Background Art

[0002] As described in Patent Document 1, there is a chamber type in the gas filling method. In this chamber type, a bag is set inside the chamber, the entire inside of the chamber is evacuated, and then a filling gas is sent in as it is, and then the bag mouth is sealed. Since the entire inside of the chamber is evacuated and sealed in a filling gas atmosphere, the gas replacement rate is very high.

[0003] Recently, there has been a demand to perform gas-filled packaging using this chamber type for light and easily floating items such as flower bonito and matcha in order to preserve them for a long time.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, when filling with gas, the filling gas is blown into the bag from the nozzle opening with a certain amount of force. As a result, items such as flower bonito tend to fly up and scatter, and it is easy to cause seal defects, etc. On the other hand, although it is technically possible to reduce the blowing speed, the filling time will be significantly extended, which will significantly deteriorate the working efficiency. Therefore, such a countermeasure was not realistic.

[0006] This invention was made in view of the above-mentioned conventional problems, and aims to provide a novel and useful chamber-type gas filling and packaging apparatus that can be applied to chamber-type filling and packaging of dried bonito flakes and the like without sacrificing work efficiency. [Means for solving the problem]

[0007] The present invention has been made to solve the above problems, and the invention of claim 1 is a chamber-type gas-filled packaging apparatus for setting a bag containing an object to be packaged in a chamber and filling it with gas, comprising: an opening narrowing means for temporarily narrowing the opening near the mouth of the bag; a gas-filling nozzle whose nozzle opening is inserted from the mouth of the bag; and a nozzle moving mechanism in which the nozzle opening is movable between a position facing the opening narrowed by the opening narrowing means and a position retracted from the mouth of the bag. The aforementioned narrowed opening is located closer to the center in the left-right direction. The gas filling nozzle is inserted through the opening of the bag, and the nozzle opening is in the narrowed opening. Close proximity In opposing positions, The narrowed opening is pushed open in the vertical direction, As the chamber is evacuated, the inside of the bag is also evacuated with a delay, causing the bag to expand, and filling gas is blown into the expanded bag from the opposing nozzle opening of the gas filling nozzle. Inside the bag, an airflow is formed that splits and swirls in the left and right directions. As the blowing progresses, the packaged item cannot pass through the narrowed opening, but the filling gas gradually leaks out little by little. This is a gas-filled packaging device characterized by the following:

[0009] Claim 2 The invention is claimed 1 The chamber-type gas filling and packaging apparatus described above is characterized in that a flat nozzle opening is located in close proximity to and opposite a flat opening.

[0010] Claim 3 The invention is as described in claim 1 or 2 In the chamber-type gas-filled packaging apparatus described above, the opening narrowing means is characterized by narrowing the opening by overlapping the bag surfaces and elastically pressing and closing a portion of them.

[0011] Claim 4 The invention is claimed 3In the chamber-type gas filling and packaging device described in [reference], the opening narrowing means is a gas filling and packaging device characterized in that it closes by pressing through the bag mouth so that the elastic surface straddles the groove with respect to the grooved anti-slip surface.

[0012] Claim 5 The invention according to [reference] is a gas filling and packaging device characterized in that, in the chamber-type gas filling and packaging device described in any one of Claims 1 to 4 [reference], the opening narrowing means also serves as bag setting means.

[0013] Claim 6 The invention according to [reference] is a gas filling and packaging device characterized in that, in the chamber-type gas filling and packaging device described in any one of Claims 1 to 5 [reference], the object to be packaged is an aggregate having a property that it is easily lifted by the flow of gas.

Effect of the Invention

[0014] According to the chamber-type gas filling and packaging device of the present invention, even items such as flowered dried bonito and matcha, which are light and easy to lift, can be the objects of packaging.

Brief Description of the Drawings

[0015] [Figure 1] It is a perspective view of a chamber-type gas filling and packaging device according to an embodiment of the present invention. [Figure 2] It is a perspective view of the gas filling and packaging device of FIG. 1 viewed from another direction. [Figure 3] It is a partially enlarged view of FIG. 1. [Figure 4] It is a partially omitted enlarged view in which the bag presser and related members are omitted from FIG. 3. [Figure 5] It is a partially sectional side view showing the bag setting state in the gas filling and packaging device of FIG. 1. - [Figure 6] It is an enlarged view showing the bag pressing state in FIG. 5. [Figure 7] It is a partially sectional explanatory view showing the state of closing the door, following FIG. 5. [Figure 8] It is an explanatory diagram of the gas filling and packaging operation using the gas filling and packaging device of FIG. 1. [Figure 9] It is an image diagram during gas filling of FIG. 8. [Figure 10] It shows the actual object of an article in which flowered bonito is stored in a bag and filled with nitrogen gas and sealed using the gas filling and packaging device of FIG. 1. [Figure 11] It shows the actual object of an article in which matcha is stored in a bag and filled with nitrogen gas and sealed using the gas filling and packaging device of FIG. 1.

Mode for Carrying Out the Invention

[0016] The chamber-type gas filling and packaging device 1 according to an embodiment of the present invention will be described according to the drawings. As shown in FIGS. 1 and 2, a vacuum chamber 5 is provided above the machine base 3. This vacuum chamber 5 consists of a rectangular container-shaped main body 7 and a door 13, and an O-ring 11 (omitted in FIG. 1, shown in FIGS. 5 and 7) is attached to a groove 9 on the upper edge of the main body 7. When the flat door 13 covers the main body 7, it is closed via the O-ring 11 and the inside is sealed. The door 13 is provided with a glass window (not shown) for observing the inside of the vacuum chamber 5. The main body 7 is inclined so that the front side is lower, and when the bag P is set as described later, it will be in a semi-suspended state due to its own weight. While also using the illustrated states of FIGS. 3 to 7, the structure will be described in detail below.

[0017] Reference numeral 15 indicates an arm, and an intermediate portion of this arm 15 is rotatably supported on the outer surface side of the back surface portion 7a of the main body 7. The main body 17a of an air cylinder 17 is attached to the bottom surface of the main body 7, and a piston rod 17b extends and contracts from 17a. The tip of this piston rod 17b is fixed to one end side of the arm 15. Also, the other end side of the arm 15 is fixed to the top surface of the door 13. As configured above, the door opening and closing mechanism 19 is formed, and by the extension and contraction of the piston rod 17b, the arm 15 rotates and the door 13 opens and closes.

[0018] In addition to this door opening and closing mechanism 19, a handle 20 is also attached to the top surface of the door 13, and when the piston rod 17b is set to free movement, the door can be opened and closed using the handle 20. The internal structure of the main body 7 will be described in detail below, but for the sake of convenience, when describing directions, the inclination of the main body 7 will be ignored and it will simply be described as the front, back, left, and right directions.

[0019] As clearly shown in the enlarged views of Figures 3 and 4, a rectangular, thin mounting plate 21 is attached to the bottom surface inside the main body 7, similarly within the rectangular edges of the bottom surface. There is a gap between the rear edge of the mounting plate 21 and the side surface of the main body 7, and a mounting portion 23 is fixed to the bottom surface of the main body 7 along the rear edge of the mounting plate 21. This mounting portion 23 extends elongatedly in the left-right direction from the main body 7, and its cross-section perpendicular to the left-right direction is concave.

[0020] The vertical surface portion 25a of a bracket 25, which is made of angle material bent into an L-shape in cross-section, is superimposed and fixed to the front surface of the mounting portion 23. The horizontal surface portion 25b of this bracket 25 protrudes forward from the upper end of the vertical surface portion 25a and is located above the mounting plate 21. In addition, a very short vertical surface portion 25c hangs down from the front end of the horizontal surface portion 25b, parallel to the vertical surface portion 25a. The upper surface of the horizontal surface portion 25b is at approximately the same height as the upper end of the mounting portion 23. A rubber sheet 27 is attached to the upper surface of the side surface 25b for anti-slip purposes. The rubber sheet 27 is in the shape of a long, narrow strip, and two rubber sheets 27, 27 are attached, one along the front edge of the side surface 25b and the other along the rear edge. There is a gap between the two rubber sheets 27, 27, and this gap forms a groove 29. The bag receiver 31 is formed by rubber sheets 27, 27 and grooves 29.

[0021] A bag retainer 33 is positioned above the bag holder 31. Reference numeral 35 indicates a shaft, and elastic cylinders 37, 37, ... made of silicone resin are fitted onto and fixed to this shaft 35. Through holes 37a, 37a are formed on the upper and front sides of the cylinders 37, respectively. Three cylinders 37, 37, 37 form a set, and within the same set, the end faces of adjacent cylinders 37, 37 are in close contact. This set constitutes the bag retainer 33. A predetermined gap 39 is left between adjacent bag retainers 33, 33.

[0022] Guide portions 40, 40 are provided on the left and right inner surfaces of the main body 7, facing each other. When the shaft 35 is lowered while guiding both axial ends of the shaft 35 with these guide portions 40, 40, the shaft 35 is mounted in the predetermined position, and as described above, the bag retainer 33 is positioned above the bag receiver 31, and the cylinder 37 comes into contact with the rubber sheet 27. At this time, the axial direction of the shaft 35 is approximately aligned vertically with the widthwise centerline of the groove 29 between the two rubber sheets 27, 27, and the elastic outer surface of the cylinder 37 straddles the groove 29.

[0023] Press sections 41, 41, ... protrude from the lower surface of the door 13, and the lower surface of the press section 41 is an annular, rigid pressing surface 41a. Multiple press sections 41 are arranged at predetermined intervals, and when the door 13 is closed, the press sections 41, 41, ... correspond individually to the bag holders 33, 33, ..., and the pressing surface 41a of the press section 41 presses down on the middle cylinder 37 of the bag holder 33 from above. This pressing causes the cylinder 37 to be elastically pressed against the rubber sheet 27. The bag setting mechanism consists of a bag receiver 31, a bag holder 33, and a press section 41.

[0024] Reference numeral 43 indicates a gas injection nozzle. The cylindrical cross-section of this gas injection nozzle 43 is perfectly circular at the base end, but gradually deforms into a flattened shape towards the nozzle opening 43a, and near the nozzle opening 43a, the outer surface in the vertical direction becomes a flattened plane 43b, 43b. Therefore, the nozzle opening 43a is a horizontally elongated oval. A long, slender, angular nozzle base 45 is positioned inside the main body 7, extending in the left-right direction. The base end of a gas injection nozzle 43 is connected to the front of this nozzle base 45, and the axial direction of the gas injection nozzle 43 is in the front-back direction. Multiple gas injection nozzles 43, 43, ... are connected to each other in parallel at predetermined intervals.

[0025] The inside of the nozzle base 45 is hollow and serves as a gas chamber, to which a cylinder of nitrogen gas used as the filling gas is connected. Nitrogen gas is then injected through the gas chamber from each nozzle opening 43a, 43a, ...

[0026] The main body 47a of the air cylinder 47 is attached to the outer surface of the rear portion 7a of the main body 7. The piston rod 47b extends and retracts from the main body 47a, passing through a through hole 7b in the rear portion 7a while maintaining airtightness. The tip of this piston rod 47b is fixed to the back of the nozzle base 45. Two air cylinders 47 are provided in parallel and are fixed to the back of the nozzle base 45 with a gap between them in the left-right direction.

[0027] As described above, the nozzle movement mechanism 49 is configured such that the gas injection nozzles 43, 43, ... can move back and forth in the front-to-back direction in conjunction with the nozzle base 45. When the air cylinder 47 is unlocked, it becomes free, and the gas injection nozzles 43 can be moved manually together with the nozzle base 45. As the gas injection nozzle 43 moves forward, it approaches the bag setting mechanism. The trajectory of the gas injection nozzle 43 is located in the gap 39 between adjacent bag holders 33, 33, and at its maximum advancement, it approaches the bag receiver 31.

[0028] As described above, a bag receiver 31 is attached to the front side of the mounting portion 23, and a rectangular parallelepiped seal bar 51 is housed in the concave surface. The upper surface of this seal bar 51 protrudes slightly upward from the mounting portion 23 and is almost flush with the upper surface of the rubber sheet 27. Therefore, when the gas injection nozzle 43 moves, the lower flat surface 43b passes above the upper surface of the seal bar 51, but does not come into contact with it.

[0029] The main body 53a of the air cylinder 53 is mounted on the upper surface of the door 13. A through hole 13a (Figure 5) is formed in the door 13, and the piston rod 53b extends and retracts from the main body 53a by passing through this through hole 13a while maintaining airtightness. A mounting part 54 is fixed to the tip of this piston rod 53b. The mounting part 54 has the same configuration as the mounting part 23, and a seal bar 55 that will be on the press side is attached to it. Three air cylinders 53 are provided at predetermined intervals and are fixed to the upper surface of the mounting part 54 at predetermined intervals in the left-right direction. The press advance / retract mechanism 57 is configured as described above.

[0030] The seal bar 55 is shaped to match the seal bar 51, and even when the door 13 is closed, the lower surface of the seal bar 55 faces the upper surface of the seal bar 51, but there is a gap between them, allowing the gas injection nozzle 43 to move forward and backward. Although the nozzle base 45 moves forward and backward along with the gas injection nozzle 43, even at its maximum extension, the front surface of the nozzle base 45 is located behind the mounting portion 23, so there is no obstruction to the movement of the gas injection nozzle 43.

[0031] Each of the sealing bars 55 and 51 is equipped with a heater (not shown) that generates heat when an electric current is applied. When the pressing retraction mechanism 57 moves the sealing bar 55 closest to the sealing bar 51 and clamps a bag between them, the sealing bar 51 works in cooperation with the sealing bar 55 to seal the opening of the clamped bag.

[0032] As described above, the rear part 7a of the main body 7 has two through holes 7b that are spaced apart in the left-right direction and connected to the gas injection nozzle 43, but another through hole 7c is formed in the center. This through hole 7c is connected to the vacuum pump via a through valve (open to the atmosphere).

[0033] The chamber-type gas-filled packaging apparatus 1 is configured as described above, and the operation of each part will be explained in relation to the gas-filled packaging operation in which nitrogen gas is filled into a heat-sealable vinyl bag P containing bonito flakes F as the packaged product, with reference to Figure 8.

[0034] (Bag set) With the door 13 open and the bag retainer 33 removed, the gas injection nozzle 43 is manually extended to its maximum extent and pushed forward. In that state, as shown in Figure 5, insert the nozzle opening 43a side of the gas injection nozzle 43 into the bag opening P1 of the bag P, while placing the bag opening P1 side on the upper surface of the bag holder 31 and the seal bar 51. Bring the bag opening P1 to a position where it slightly protrudes beyond the trailing edge of the seal bar 51. Also, adjust the gas injection nozzle 43 so that it is approximately in the middle of the left-right direction of the bag P.

[0035] Bag P is a rectangular flat bag, and is placed on the mounting plate 21 in a lying position so that one of the pair of opposing bag surfaces is in contact with the bag receiver 31 and the upper surface of the seal bar 51. Because the mounting plate 21 is inclined, bag P is in a semi-suspended state below the corners of the side surface 25b and the vertical surface 25c of the bracket 25, and the bonito flakes F contained in bag P accumulate at intervals from the opening K due to their own weight.

[0036] Next, the shafts 35 on the bag retainers 33, 33, ... sides are attached to the inside of the main body 7. Since the bag opening P1 side of the bag P is already placed on the bag receiver 31, this attachment causes the pair of bag surfaces on the bag opening P1 side to overlap and be lightly sandwiched together by the weight of the bag retainers 33, temporarily closing them. At this time, the bag opening P1 from both ends to the middle is sandwiched between the bag retainers 33 and the bag receiver 31 by the adjacent bag retainers 33, 33, but the middle is located in the gap 39 and remains open without being temporarily closed. In this way, the bag setting means also serves as an opening narrowing means that temporarily closes and narrows a part of the original opening of the bag opening P1.

[0037] Since the opening K is close to the nozzle opening 43a of the gas filling nozzle 43 inserted from the bag opening P1 side, the opening K is pushed open in the vertical direction. As shown in Figure 6, the nozzle opening 43a side is flattened 43b, 43b, so the opening K is also small and flattened. The inside of the bag P communicates with the inside of the vacuum chamber 5 through this opening K.

[0038] After returning the nozzle movement mechanism 49 of the gas injection nozzle 43 to an operational state, the door 13 is manually closed, and thereafter the control unit operates each part. First, the door 13 is completely closed by the door opening / closing mechanism 19, and the vacuum chamber 5 is closed. The atmosphere inside the closed vacuum chamber 5 is at atmospheric pressure. Furthermore, the bag setting is completed. As shown in Figure 7, the pressing surface 41a of the press section 41 presses the bag holder 33 against the bag receiver 31, and the cylinder 37 elastically presses against the rubber sheet 27 while sandwiching the bag P, thus stabilizing the temporarily closed state. The vacuum chamber 5 is equipped with multiple bag holders 33, 33, ..., allowing multiple bags P to be set simultaneously.

[0039] (Vacuuming) The through valve is opened and the vacuum pump is activated to draw air from inside the vacuum chamber 5. Since the inside of bag P is also connected through the opening K, air is also drawn in from inside bag P. However, because the air escape route inside bag P is narrowed by opening K, the outside of bag P is preferentially sucked in, followed later by the inside of bag P. The final vacuum level is almost the same inside and outside of bag P, but due to this delay, the outside of bag P becomes lower pressure before the inside, causing bag P to expand. In this expanded state, it reaches the predetermined vacuum level and the vacuuming process is completed.

[0040] During vacuuming, the bag holder 33 is firmly restrained by the press section 41, preventing it from lifting up. Additionally, a groove 29 exists between the rubber sheets 27, 27, preventing the bag P from detaching due to expansion. Furthermore, during the vacuuming process, a certain suction speed is used to ensure work efficiency. While this speed would normally break the bonito flakes (K), the resulting suction inside bag P is gentle, allowing the flakes to maintain their shape without being damaged.

[0041] (Gas filling) After stopping the vacuum pump and closing the through valve to end the vacuuming process, the valve on the nitrogen cylinder side is opened, and nitrogen gas is blown into the bag P from the nozzle opening 43a of the gas filling nozzle 43. Since the nozzle opening 43a enters the bag P through the bag opening P1, and the opening K is close to the front of the blowing, the nitrogen gas preferentially enters the bag P. While the blowing speed is kept relatively low to optimize work efficiency, the bag P expands and its volume increases, allowing the nitrogen gas to circulate to every corner of the bag P while suppressing the scattering of the bonito flakes F.

[0042] As shown in Figure 9, inside bag P, the injected nitrogen gas forms an airflow that swirls left and right, as indicated by the thick arrows. As the injection continues, the nitrogen gas gradually leaks out through opening K, as indicated by the dashed arrows, but this airflow is strong, and even if a small amount of bonito flakes F are stirred up, they cannot pass through opening K. Even after the nitrogen gas injection is complete, the pressure inside bag P remains higher than the pressure outside, so bag P continues to expand.

[0043] (Seal the bag opening) After closing the valve and ending the injection of nitrogen gas, the gas injection nozzle 43 is retracted, and the seal bar 55 is lowered instead, sandwiching the bag opening P1 side between the seal bar 51 and the nozzle, and sealing it by heat welding. As a result, the bag P is sealed by the seal portion S with nitrogen gas filled inside.

[0044] (Removing the bag) Next, the seal bar 55 is raised, and the through valve is closed to release to the atmosphere, returning the pressure inside the vacuum chamber 5 to atmospheric pressure. This allows the door 13 to open, and after it has opened to a certain extent by the door opening / closing mechanism 19, it becomes manually operable. The door is then opened fully by hand, the bag retainer 33 is removed, and the bag P is taken out. This completes the series of gas-filling and packaging operations.

[0045] As described above, the distinctive configuration of the chamber-type gas-filled packaging device 1 allows for the closing of a portion of the bag opening P1 to create a narrower opening K than the bag opening P1, enabling the bag P to expand during vacuuming before proceeding to the subsequent gas-filling operation. During the subsequent gas-filling, the gas is blown into the expanded bag P, effectively preventing the bonito flakes F from scattering even when using a realistic gas blowing speed. Therefore, even when packaging bonito flakes F, the advantages of a high degree of gas displacement in a chamber-type device can be fully enjoyed.

[0046] The area of ​​the opening K is optimally set considering the size of the bag P, the amount of bonito flakes F to be contained, the suction speed of the vacuum, etc. Therefore, when filling with other materials, the settings will need to be adjusted each time, but because the gas injection nozzle 43 is flattened, it is easy to close the bag opening P1 and easy to adjust the opening area of ​​the opening K.

[0047] The bags obtained from the actual process are as shown in Figure 10, and the bonito flakes remain undamaged. Furthermore, the sealed bags are inflated, so they also function as cushioning material for the bonito flakes. Figure 11 also shows a product containing matcha powder.

[0048] Although embodiments of the present invention have been described in detail above, the specific configuration is not limited to these embodiments, and any design changes or other modifications that do not depart from the spirit of the invention are also included in the invention. For example, the chamber-type gas-filled packaging device 1 according to the above embodiment is a so-called "manual machine" in which a bag P containing bonito flakes F is set by hand. However, the present invention can also be applied to a so-called "automatic machine" in which the bag is opened inside the machine, the raw material is placed inside while a vacuum is created, and then an inert gas is filled in. Furthermore, the packaged material is not particularly limited as long as it can be gas-filled with the gas-filled packaging device of the present invention. However, if the material is a aggregate that is easily stirred up by the flow of gas, such as bonito flakes or matcha powder, this is the way in which the device's characteristics are best utilized. [Explanation of Symbols]

[0049] 1... Chamber-type gas-filled packaging machine 3... Machine stand 5...Vacuum chamber 7...Main body 7a...Rear section 7b...Through hole 7c...Through hole 9...Groove 11…O-ring 13…Door 13a…Through hole 15...Arm 17...Air cylinder 17a...Main body 17b...Piston rod 19...Door opening / closing mechanism 20...Handle 21…Mounting plate 23…Mounting part 25…Bracket 25a...Vertical section 25b...Horizontal section 25c...Vertical section 27...Rubber sheet 29...Groove 31...Bag holder 33...Bag holder 35...Shaft 37...Cylinder 37a...Through hole 39...Gap 40...Guide section 41...Pressing section 41a...Pressing surface 43...Gas injection nozzle 43a...Nozzle opening 43b...Flat surface 45...Nozzle base 47...Air cylinder 47a...Main body 47b...Piston rod 49...Nozzle movement mechanism 51...Seal bar 53...Air cylinder 53a...Main body 53b...Piston rod 54...Mounting part 55...Seal bar 57...Press advance / retract mechanism K...Opening P...Bag P1...Bag opening F...Dried bonito flakes S...Seal part

Claims

1. In a chamber-type gas-filled packaging apparatus that sets a bag containing the product to be packaged inside a chamber and performs gas-filled packaging, The bag comprises an opening narrowing means for temporarily narrowing the opening near the bag opening, a gas filling nozzle with its nozzle opening inserted from the bag opening, and a nozzle moving mechanism that allows the nozzle opening to move between a position facing the opening narrowed by the opening narrowing means and a position retracted from the bag opening. The aforementioned narrowed opening is located closer to the center in the left-right direction. The gas filling nozzle is inserted through the opening of the bag, and when the nozzle opening is in close proximity to and facing the narrowed opening, the narrowed opening is pushed open in the vertical direction. A gas-filled packaging apparatus characterized in that the chamber is evacuated, and the inside of the bag is also evacuated with a delay, causing the bag to expand, and filling gas is blown into the expanded bag from the opposing nozzle openings of the gas filling nozzles, forming an airflow that is divided into left and right directions and swirls inside the bag, and as the blowing progresses, the packaged item cannot pass through the narrowed opening, but the filling gas leaks out little by little.

2. In the chamber-type gas-filled packaging apparatus described in claim 1, A gas-filling and packaging apparatus characterized by having a flattened opening and a flattened nozzle opening located in close proximity to each other.

3. In the chamber-type gas-filled packaging apparatus described in claim 1 or 2, The opening narrowing means is a gas-filled packaging apparatus characterized by narrowing the opening by overlapping the bag surfaces and elastically pressing and closing a portion of them.

4. In the chamber-type gas-filled packaging apparatus described in claim 3, The opening narrowing means is characterized by closing the opening by pressing an elastic surface against a grooved anti-slip surface via the bag opening so that it straddles the grooves.

5. In a chamber-type gas-filled packaging apparatus according to any one of claims 1 to 4, A gas-filled packaging apparatus characterized in that the opening narrowing means also serves as a bag setting means.

6. In a chamber-type gas-filled packaging apparatus according to any one of claims 1 to 5, A gas-filled packaging apparatus characterized in that the packaged material is an aggregate that is easily stirred up by the flow of gas.

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