JP6128678B2 - Gas replacement device - Google Patents

Description

The present invention relates to a gas displacement device for hermetically wrapping a light and thin package such as a shaving node together with an inert gas such as nitrogen gas / carbon dioxide gas or a mixed gas thereof in a packaging bag.

As shown in FIG. 8, the gas displacement device disclosed in Patent Document 1 includes an inert gas ejection nozzle 15 having a gas ejection port at the lower end, and a piston-like object 13 through which the inert gas ejection nozzle 15 passes. , And a hopper 11 having a cylindrical portion in which the piston-like object 13 is fitted.
In the gas replacement device, the lower end of the hopper 11 is inserted into the bag mouth of the packaging bag 14, the lower end of the inert gas ejection nozzle 15 is inserted into the bottom of the packaging bag 14, and the inert gas ejection nozzle 15 While injecting an inert gas from the gas outlet, the piston-like object 13 descends, and a light article 12 such as a shaving node staying in the hopper 11 is dropped into the packaging bag 14, and the packaging bag The air in the band of the article 12 to be packaged 14 is exhausted to the outside of the packaging bag 14 with the inert gas to perform gas replacement.
Subsequently, the hopper 11, the piston-like object 13, and the inert gas ejection nozzle 15 are retracted out of the packaging bag 14, and the bag mouth of the packaging bag 14 is sealed to produce a packaged product.

JP-A-54-58589

In the case of a light article to be packaged such as the shaving node, the article to be packaged rises due to the force of the inert gas ejected, and the article to be packaged jumps out from the bag mouth of the packaging bag, becomes insufficient in weight, There is a problem of sticking to the seal surface and causing a seal failure.
In addition, if the momentum of the inert gas is lowered in order to suppress the rising of the packaged item, there is a problem that the gas replacement rate is deteriorated because the air in the packaged item is difficult to be exhausted outside the packaging bag.

In view of such problems, an object of the present invention is to provide a gas replacement device in which a packaged product does not rise and a packaged product with a good gas replacement rate is manufactured.

The gas displacement device of the present invention is provided on the outer periphery of the first nozzle composed of a pipe for ejecting gas into the packaging bag from the gas ejection hole, and fits to the inner surface of the opened packaging bag and ejects it. A filtration unit that captures an object to be packaged that rises due to the momentum of gas, and a vertical movement mechanism that inserts the first nozzle and the filtration unit into a packaging bag are provided.

With the above-described configuration, the present invention can suppress the rising of the article to be packaged, and a packaged product with a good gas replacement rate is manufactured.

Front view of gas replacement device Top view of rotary automatic packaging machine with gas displacement device Top view of a rotary automatic packaging machine equipped with a clamping device Side view of the clamping device Illustration of gas replacement action Partial plan view of the clamping device Another embodiment of the filter member Front view of conventional gas replacement device

As shown in FIG. 2, a mode in which the gas displacement device 21 of the present invention is mounted on a known rotary automatic packaging machine 22 will be described.
The rotary automatic packaging machine 22 includes a clamp 24 on the outer peripheral edge of a rotating filling table 23, and the packaging bag 14 is delivered to the clamp 24 from a packaging bag supply device (not shown). It is transferred downstream. The packaging bag 12 suspended from the clamp 24 is filled with the article 12 by the filling device 25 (A).
Subsequently, an inert gas is ejected from the first gas replacement device 26A (B) into the packaging bag 14 filled with the article 12 to be packaged, and further an inert gas is ejected from the second gas replacement device 26B. (C).
The packaging bag 14 from which the inert gas has been ejected is sealed at the bag mouth by a sealing device 27 (D), and is carried out of the rotary automatic packaging machine 22 to produce a packaging product in which gas replacement packaging is carried out.
2 are common to the alphabets in the other drawings and represent the same steps.

FIG. 1B shows the first gas replacement device 26 </ b> A that ejects an inert gas into the packaging bag 14.
The first gas replacement device 26A includes a first nozzle 31A in which gas ejection holes 31C are formed at four locations on the outer periphery of the lower end of the pipe.
If the flange 32A at the upper end of the first nozzle 31A and the flange 32B at the lower end of the first gas intake portion 33A are detachably fixed by a band 32, the first nozzle 31A can be replaced by releasing the fixation of the band 32. Can be easily performed. The internal passages of the first nozzle 31A and the first gas intake part 33A communicate with each other, and the first gas intake part 33A includes a port that communicates with a gas source (not shown).
The tip of the rod of the first cylinder 34A is connected to the upper end portion of the first gas intake portion 33A, and the first nozzle 31A passes through the first gas intake portion 33A by the expansion and contraction of the rod of the first cylinder 34A. Move up and down.
The first cylinder 34A is supported by one end of a fixture 35, and the other end of the fixture 35 is fixed to a vertical movement shaft 36 provided in the machine base.
The fixing device 35 is composed of two plates connected by screws, and the first fixing portion 35 is adjusted by adjusting the fixing angle of the fixing device 35 with respect to the vertical movement shaft 36 and adjusting the total length of the two plates. The gas replacement device 26A can be adjusted in the horizontal direction.
The vertical movement of the vertical movement shaft 36 moves the entire first gas replacement device 26A up and down. The first nozzle 31A moves up and down greatly by a vertical movement mechanism of the vertical movement of the vertical movement shaft 36 and the expansion and contraction movement of the rod of the first cylinder 34A.
Although the vertical movement mechanism has been described with two of the vertical movement shaft 36 and the first cylinder 34A, it goes without saying that the vertical movement amount of one may be increased and the other may be omitted, and the vertical movement may be performed by one.

The pipe of the first nozzle 31 </ b> A includes a filtering unit 40 that prevents the packaged material that soars due to the force of the inert gas ejected from the first nozzle 31 </ b> A from jumping out from the bag mouth of the packaging bag.
The filtering member 38 of the filtering unit 40 captures the article 12 to be packaged, but is formed in a hemispherical shape with a metal mesh through which gas passes, and the first nozzle 31A passes through and is fixed at the center.
A fitting material 39 having substantially the same shape as the opening of the opened packaging bag 14 is provided on the periphery of the filtering member 38 to fit the filtering member 38 and the packaging bag 14 together. The outer periphery of the fit material 39 is provided with a plurality of cuts 39A (see FIG. 2) at equal intervals toward the center, and the fit material 39 and the packaging bag are deformed by the deformation of the fit material 39 by the cut processing 39A. 14 to improve the fit with the inside.
The filtering part 40 is fixed by sandwiching the upper and lower parts of the central part of the filtering member 38 by two fixing members 37 made of donut-shaped silicon rubber fitted into the pipe of the first nozzle 31A.
The filtration unit 40 needs to be replaced according to the size of the packaging bag 14, and the attachment height position of the filtration unit 40 needs to be adjusted according to the amount of the article 12 to be packaged. Since the filtering part 40 is only sandwiched between the fixing members 37, replacement work and fixing position adjustment work are easy.

FIG. 1C shows the second gas replacement device 26 </ b> B that ejects an inert gas into the packaging bag 14.
The second gas replacement device 26B includes a second nozzle 31B having a gas ejection hole formed at the lower end of the flat pipe.
The flange 32A at the upper end of the second nozzle 31B and the flange 32B at the lower end of the second gas intake portion 33B are detachably fixed by a band 32. If the fixing of the band 32 is released, the second nozzle 31B is replaced. Can be easily performed. The internal passages of the second nozzle 31B and the second gas intake part 33B communicate with each other, and the second gas intake part 33B includes a port communicating with a gas source (not shown).
The tip of the rod of the second cylinder 34B is connected to the upper end portion of the second gas intake portion 33B, and the second nozzle 31B passes through the second gas intake portion 33B by the expansion and contraction of the rod of the second cylinder 34B. Move up and down.
The second cylinder 34B is supported by one end of a fixture 35, and the other end of the fixture 35 is fixed to the vertical movement shaft 36 provided in the machine base.
The fixture 35 is composed of two plates connected by screws, and the second angle is adjusted by adjusting the fixing angle of the fixture 35 with respect to the vertical movement shaft 36 and adjusting the total length of the two plates. The gas replacement device 26B can be adjusted in the horizontal direction.
The vertical movement of the vertical movement shaft 36 moves the entire second gas replacement device 26B up and down. The second nozzle 31B largely moves up and down by a vertical movement mechanism of the vertical movement of the vertical movement shaft 36 and the expansion and contraction movement of the rod of the second cylinder 34B.
Although the vertical movement mechanism has been described with two of the vertical movement shaft 36 and the second cylinder 34B, it goes without saying that the vertical movement amount of one may be increased and the other may be omitted, and the vertical movement may be performed by one.

As shown in FIG. 1 and FIG. 3 (C), a known clamping device 41 described in Patent Document 1 is disposed below the second gas replacement device 26B and is provided on the vertical movement shaft 36. ing.
While the second gas replacement device 26B is injecting inert gas into the packaging bag 14, the clamping device 41 holds the bag mouth of the packaging bag 14 and seals the bag mouth of the packaging bag 14. A gap (see FIG. 6) that allows a slight amount of gas to pass around the second nozzle 31B is vacant. Air in the packaging bag 14 is exhausted by the inert gas from the gap.

As shown in FIG. 4, the clamping device 41 includes a pair of clamping members 42 that clamp the bag mouth of the packaging bag 14. The pair of clamping members 42 are fixed to a pair of meshed gears 44 via a joint plate 43. One gear 44 is pivotally supported at the tip of the rod of the sandwiching cylinder 45. The sandwiching cylinder 45 and the pair of gears 44 are respectively supported by a horizontally long base plate 46. The base plate 46 is fixed to the vertical movement shaft 36 via two connected support plates 47 (see FIG. 3).

The entire clamping device 41 moves up and down with the vertical movement of the vertical movement shaft 36.
The expansion and contraction movement of the rod of the sandwiching cylinder 45 rotates one of the gears 44 and reversely rotates the other gear 44 that meshes with the one gear 44, as indicated by a virtual line, The pair of clamping members 42 are opened and closed.
The gap for exhausting the air in the packaging bag 14 is formed in the pair of clamping members 42. The gaps are cut out in a U-shape (see FIG. 6) near the center in the width direction of the sandwiching member 42 so that the second nozzle 31B is not sandwiched when the pair of sandwiching members 42 are sandwiched. ing.

Next, the operation of the gas replacement device 21 having the above configuration will be described.
The packaging bag 14 is transferred from the packaging bag supply device (not shown) to the clamp 24, and the bag mouth of the packaging bag 14 is opened by the opening device (not shown) while being transferred by the rotation of the filling table 23. As shown in FIG. 5 (1), the packaging bag 14 whose bag mouth is opened is filled with the article 12 to be packaged by the filling device 25 in the section (A), and is transferred by the rotation of the filling table 23. The

As shown in FIG. 5 (2), in the section (B), the first gas displacement device 26A is lowered as the vertical movement shaft 36 is lowered, and the first nozzle 34 is extended by the extension of the rod of the first cylinder 34A. 31 </ b> A descends and the first nozzle 31 </ b> A and the filtering part 40 are inserted into the packaging bag 14.
The lower end of the first nozzle 31 </ b> A is positioned at the bottom of the packaging bag 14, and the filtering unit 40 is positioned near the center of the packaging bag 14. The outer periphery of the fitting material 39 of the filtration unit 40 is fitted to the inner surface of the packaging bag 14.

As shown in FIG. 5 (3), an inert gas is ejected from the gas ejection hole 31C of the first nozzle 31A, and the package 12 is swollen by the momentum of the inert gas ejected, and the filtration unit 40 Captured by the filter member 38. The to-be-packaged objects 12 captured one after another are densely tightened by the momentum of the inert gas flow flowing from the bag bottom toward the bag mouth.
Since the filtering member 38 captures the article 12 to be packaged, the article 12 to be packaged does not jump out of the bag mouth of the packaging bag 14 or adhere to the sealing surface, so that the momentum of the inert gas can be increased. The air in the band 12 is exhausted to the outside of the packaging bag 14 and the replacement rate is improved.

As shown in FIG. 5 (4), the first gas displacement device 26A rises as the vertical movement shaft 36 rises, and the first nozzle 31A rises due to the contraction of the rod of the first cylinder 34A. The first nozzle 31A is removed from the packaging bag 14, and the packaging bag 14 is transferred from the section (B) to the section (C) by the rotation of the filling table 23. The to-be-packaged object 12 is contained in the bag bottom of the packaging bag 14 in a tightened state, and does not carry air again.

As shown in FIG. 5 (5), in the section (C), the second gas displacement device 26B descends as the vertical movement shaft 36 descends, and the second nozzle 34 extends as the rod of the second cylinder 34B extends. 31B descends, and the second nozzle 31B is inserted into the packaging bag 14. The lower end of the second nozzle 31 </ b> B is located near the center in the packaging bag 14.

As shown in FIG. 5 (6), when the packaging bag 14 into which the second nozzle 31 B is inserted is separated from the pair of the clamps 24, the bag mouth of the packaging bag 14 is strained. Subsequently, the pair of gears 44 rotate reversely with each other by contraction of the rod of the clamping cylinder 45 of the clamping device 41, and the clamping member 42 clamps the tensioned bag mouth of the packaging bag 14. In this state, an inert gas is ejected from the gas ejection hole of the second nozzle 31 </ b> B, and air in the space above the article to be packaged 12 in the packaging bag 14 is exhausted from the gap formed in the clamping member 42. Is done.

After the gas replacement, the second gas replacement device 26B rises as the vertical movement shaft 36 rises, and the second nozzle 31B rises due to the contraction of the rod of the second cylinder 34B, and the second nozzle 31B. Is removed from the packaging bag 14, the packaging bag 14 is transferred to the section (D) by the rotation of the filling table 23, the bag mouth is sealed by the sealing device 27, and a packaging product in which gas replacement packaging is performed is manufactured. .
The packaged product packaged as described above has a good gas replacement rate, does not adhere to the sealing surface of the article 12 to be packaged, and is sealed without causing a sealing failure.

In the said Example, although the gas replacement apparatus of this invention is mounted in the rotary type automatic packaging machine, you may mount the gas replacement apparatus of this invention in a linear movement type bagging packaging machine.
Further, in the case of an article to be packaged that can perform sufficient gas replacement with one gas injection, the bag mouth may be sealed with a sealing device after gas replacement with the first nozzle.
Moreover, you may change about the said filtration member 38 of the said filtration part 40 according to a to-be packaged object. That is, in addition to the hemispherical shape described above, a disk shape having a porous shape may be used. In this case, as shown in FIG. 7, the filtration part 40 which united the filtration member and the fitting material may be sufficient.

INDUSTRIAL APPLICABILITY The present invention is useful for a gas displacement device in which a light and thin package such as a shaving node is sealed in a packaging bag together with an inert gas such as nitrogen gas / carbon dioxide gas or a mixed gas thereof.

12. · Package 14 ·· Packing bag 21 ·· Gas replacement device 22 ·· Rotary automatic packing machine 23 ·· Filling table 24 ·· Clamp 26A ·· First gas replacement device 26B ·· Second gas replacement device 31A, 1st nozzle 31B, 2nd nozzle 32, Band 33A, 1st gas intake part 33B, 2nd gas intake part 34A, 1st cylinder 34B, 2nd cylinder 35, Fixture 36 · · Vertical movement shaft 37 · · Fixed member 38 · · Filtration member 39 · · Fit material 40 · · Filtration part

Claims (2)

A first nozzle composed of a pipe for injecting gas into the packaging bag from the gas ejection hole, and an article to be packaged that is provided on the outer periphery of the first nozzle, fits to the inner surface of the opened packaging bag, and soars due to the force of the ejected gas A gas displacement device comprising: a filtration unit that captures a gas; and a vertical movement mechanism that inserts the first nozzle and the filtration unit into a packaging bag. In the gas displacement device provided with the filtration unit including the first nozzle for ejecting the gas from the gas ejection hole into the packaging bag, the filtration unit is provided on the outer periphery of the first nozzle so that the gas passes therethrough but is to be packaged. Fitting condition between the filter member that captures the filter and the inside of the packaging bag that is provided at the periphery of the filter member and is substantially the same shape and has a plurality of slits toward the center on the outer periphery is improved. And a fitting material.

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