JP2001180620A - Apparatus and method for sealing mouth of packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To completely seal a mouth of a packaging bag without any powder and granular material adhered to and remained in the mouth of the packaging bag, and to reliably seal the mouth of the packaging bag in a short time on a high-speed conveyor line to carry the packaging bag. SOLUTION: A mouth sealing apparatus of the packaging bag comprises a pusher plate which is provided on a first conveyor to incline the attitude of the mouth of the packaging bag so as to be the foremost position, a stopper plate to stop the carriage of the packaging bag on the first conveyor when the packaging bag in the inclined packaging bag is abutted thereon, a second conveyor which is disposed orthogonal to the first conveyor to carry out the packaging bag stopped at the stopper plate, an air blow apparatus disposed on a side surface of the second conveyor at the position facing the mouth of the packaging bag, a heating plate to melt and bond an adhesive at the mouth of the packaging bag on the downstream side of the air blow apparatus, and a forcible pressing apparatus which rotates the packaging bag at the abutting position of the mouth of the packaging bag on the heating plate, and presses the bag thereagainst.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for sealing a packaging bag in which a granular material such as flour is filled into a packaging bag and a valve opening of the packaging bag is sealed. ,
In particular, filling the packaging bag with powder and granular material such as flour,
The present invention relates to a packaging bag mouth-sealing device for sealing a valve opening of a packaging bag while a packaging bag filled with a granular material such as flour is conveyed on a conveyor line, and a mouth-sealing method thereof.

[0002]

2. Description of the Related Art An inner valve-type packaging bag in which powder or granules such as flour is injected from an inner valve opening of a packaging bag and the inner valve opening is closed by the pressure of the powder or particles filled in the packaging bag is widely used. Used. The inner valve-type packaging bag must completely seal the valve opening, which is an injection port, after the injection of the granular material so that the granular material in the packaging bag does not leak during transportation or storage.

[0003] As a method for sealing a packaging bag filled with a powder or a granular material such as flour, it has been widely practiced to seal a valve port of the packaging bag during transportation on a conveyor line. Various types of packaging bag mouth-sealing devices and mouth-sealing methods are known. For example, Japanese Patent Application Laid-Open Nos.
As shown in Japanese Patent Publication No. 21411, a number of patents and utility models have been filed.

[0004] However, in these prior arts, it is unavoidable that a small amount of the powdery particles adhere and remain at the valve opening of the packaging bag, though at a low frequency. However, it was not possible to completely seal, and there was a problem that the granular material leaked during transportation and storage.

[0005] As the performance of a filling machine for injecting and filling powders and granules into a packaging bag improves, the speed of a conveyor line for transporting the packaging bags filled with the powders and granules is also increased, and the speed of the conveyor line The sealing device that seals the valve opening of the packaging bag also seals the valve opening of the packaging bag in a short time on the conveyor line that transports the packaging bag at high speed, and powder and particles leak during transportation and storage. In order to prevent this from happening, it has been required to securely seal.

[0006] As shown in FIG. 4, an overhead valve type valve having a valve opening 2 in a top portion 1a is provided in a packaging bag which is filled with milled flour or the like for storage and transportation. Packaging bag 1
Alternatively, as shown in FIG. 5, there is a side-valve type packaging bag 3 having a gusset 5 and having a valve port 4 at an upper front corner. Here, FIG. 4 (a) shows an overhead valve type packaging bag 1 in which the top portion 1a and the bottom portion are both glued, and a valve opening 2 is provided at the left corner of the top portion 1a. b) is a view showing a state in which the overhead bag-type packaging bag 1 is filled with a predetermined amount of powder or granular material such as flour. FIG. 5 (a) shows a side-valve type packaging bag 3 in which both the top and bottom are glued, and a valve port 4 is provided at the left corner of the top. FIG. 5 (b) FIG. 3 is a view showing a state in which a predetermined amount of powder or granules such as flour is filled in the side-valve type packaging bag 1. And, mainly, the valve opening 2 is attached to the top 1a.
A sealing device and a sealing method for a packaging bag suitably used for the overhead valve type packaging bag 1 having the following will be described.

[0007] Bags of various materials, for example, paper bags, laminate bags, PV bags, and the like, are used as packaging bags to be filled with milled flour or the like for transportation and storage. . Here, a paper bag made of laminated kraft paper will be described as a representative example of these. However, these descriptions are not limited to paper bags, but are applicable to various bags such as paper bags, laminate bags, and PV bags.

[0008]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above circumstances, and solves the problems in the prior art, whereby powder particles adhere to a valve port of a packaging bag and remain. It is an object of the present invention to provide a mouth-sealing device and a mouth-sealing method capable of completely sealing a valve mouth portion of a packaging bag without performing. Another object of the present invention is to seal a valve opening of a packaging bag in a short time on a high-speed conveyor line for transporting the packaging bag, and to prevent powder and granules from leaking during transportation and storage. An object of the present invention is to provide a mouth-sealing device and a mouth-sealing method for surely sealing the same.

[0009]

In order to achieve the above object, a packing bag opening device according to the present invention comprises a conveyor line formed by arranging a first conveyor and a second conveyor in an L-shape. And a pusher plate provided on the first conveyor, which inclines the posture so that the valve port of the packaging bag is conveyed in an inclined posture with the frontmost position, and the packaging bag in this inclined position abuts, A hitting plate for stopping the conveyance on the first conveyor, and the second conveyor which is arranged orthogonally to the first conveyor and unloads the packaging bag in the inclined posture stopped at the hitting plate; On the side surface of the second conveyor, an air blow device arranged at a position facing the valve port of the packaging bag, and on the downstream side of the air blow device,
A hot plate that is arranged at a position in contact with the valve port of the packaging bag and that melts and seals the adhesive at the valve port of the packaging bag, and a position facing the hot plate across the second conveyor; And a forcible pressing device that rotates the packaging bag at a position where the valve port of the packaging bag abuts on the hot plate and presses the packaging bag against the hot plate.

Here, in the packing bag opening device, the contact plate is formed in an S-shape, and the valve opening of the packing bag is removed and brought into contact with the packing plate. It is desirable to stop the transport of the bag, and it is desirable that a guide plate for guiding the packaging bag is disposed between the hit plate and the hot plate. Further, the number of the air blow devices is two, one is disposed at a front end (upstream side) of the hit plate, and the other is disposed at a rear end (downstream side) of the guide plate. Preferably, the air blow device has a plurality of air nozzles, and at least one of the plurality of air nozzles is an air nozzle arranged obliquely downward. Further, a cooling device that is disposed downstream of the hot plate at a position facing the valve opening of the packaging bag and cools the valve opening of the packaging bag sealed with the hot plate to solidify the adhesive. Desirably, the plates are arranged.

In order to achieve the above object, a method for sealing a packaging bag according to the present invention is directed to a packaging bag sealing device for heating and sealing a valve opening of a packaging bag on a conveyor line. A posture changing step of inclining the packaging bag on the conveyor line by a predetermined angle and changing the packaging bag to an inclined posture for projecting a valve opening of the packaging bag to a predetermined position, and the packaging bag in the inclined posture A cleaning step of blowing air from the valve port to remove the powder in the valve port, and a sealing step of sealing the packaging bag from which the powder in the valve port has been removed. And

In this method, the packaging bag is sealed at a position where the valve opening of the packaging bag is removed after changing the posture of the packaging bag. It is preferable that the cleaning step includes a plurality of air blowing devices, and the plurality of air blowing devices each include a plurality of air nozzles. At least one of the plurality of air nozzles is an air nozzle arranged obliquely downward, and includes a corner cleaning step of removing powder staying in a lower corner of the valve port of the packaging bag. Is desirable.

Further, in the sealing step, it is preferable that the hot melt adhesive applied in advance to the valve opening of the packaging bag is heated and melted with a hot plate to seal the valve opening of the packaging bag. Preferably, the sealing step includes a cooling step of cooling a valve opening of the packaging bag sealed with the hot plate to solidify the adhesive.

[0014]

Embodiments of the present invention will be described below in detail with reference to preferred embodiments shown in the accompanying drawings.
FIG. 1 is a plan view showing the overall configuration of a packaging bag mouth-sealing device according to an embodiment of the present invention. A predetermined amount of powder and granules is filled by the filling machine in the previous process, and the packaging bag placed sideways on the conveyor line is pressed and shaped by the packaging bag shaping device while being conveyed by the conveyor line. After that, it is conveyed from the upstream by a conveyer in a preceding process (not shown), and is supplied to the packaging bag opening device according to the present embodiment in a posture in which the sealing portion is positioned on the front right side as indicated by an arrow A. Is done.

The apparatus and method for sealing a packaging bag according to this embodiment completely seals the valve opening of the packaging bag filled with the granular material. As shown in FIG. 1, a first conveyor 11 and a second conveyor 12 are arranged in an L-shape as a conveyor line for conveying in a sealing device.

The first conveyor 11 is provided with a pusher plate 13 at an angle of 20 to 30 degrees with respect to the transport direction of the first conveyor 11, and as described above, the valve port 2 The packaging bag 1 (see FIG. 4) supplied in a posture positioned on the front right side is changed in posture to be inclined leftward by the pusher plate 13 (posture changing step), and becomes the inclined posture in this posture changing step. The packaging bag 1 is conveyed by the first conveyor 11 while being inclined such that the valve port 2 of the packaging bag 1 located on the front right side is located at the frontmost position.

Since the hitting plate 14 is provided at the end of the first conveyor 11, the packaging bag 1 conveyed by the first conveyor 11 comes into contact with the hitting plate 14 and temporarily stops. As shown in FIG. 1, the contact plate 14 is formed in an S-shape, and the sealing portion 2 of the packaging bag 1 located at the forefront position on the front right side is in a state of being separated from the contact plate 14. As a result, the central portion of the packaging bag 1 comes into strong contact with the hitting plate 14, and the transport of the packaging bag 1 by the first conveyor 11 is stopped (packaging bag locking step). At this time, since the central portion of the packaging bag 1 strongly contacts the hitting plate 14, the packaging bag 1 is depressed and deformed due to the inertia of the internal powder and granular material, and the powder and granular material inside the packaging bag 1 At the central part which abuts on 14, the powder is strongly compacted, and due to the inertia of the powder, the density of the powder also increases inside the valve port 2.

Next, the packaging bag 1 stopped in contact with the contact plate 14 is pushed out toward the second conveyor 12 by a cylinder (not shown) with a pusher plate 13, and the first bag is pushed out of the first bag.
It is carried out of the first conveyor 11 by the second conveyor 12 arranged orthogonal to the conveyor 11. Also, at this time, the packaging bag 1 is discharged from the first conveyor 11 with the valve port 2 positioned at the forefront position on the front right side. The valve port 2 is conveyed in a posture protruding rearward and rightward.

At this time, since the valve port 2 of the packaging bag 1 that has come off and stopped from the hitting plate 14 moves while being pressed along the hitting plate 14, it moves while being deformed by the hitting plate 14. The powder and granules inside the valve port 2 are pressed into the inside of the packaging bag 1, and inside the valve port 2 of the packaging bag 1, the packaging bag 1 is crushed and the powder and granules are further pressed hard. Can be hardened.

The first conveyor 1 is controlled by the second conveyor 12.
The packaging bag 1 carried out of the packaging bag 1 is provided close to the end of the hitting plate 14, and is opened by the first air blow device 15 disposed at a position facing the valve opening 2 of the packaging bag 1. Is air blown (cleaning step). At this time, the valve port portion 2 of the packaging bag 1 is in a state where the granular material is pressed and crushed and the internal pressure of the granular material from the inside is not applied, so that the packaging bag 1 is easily blown by air blow. The valve opening 2 is opened, and the powder or the like remaining in the valve opening 2 can be scattered and removed.

FIG. 2A shows the first air blow device 15.
It is a figure which shows the detail of. This first air blow device 15
Is applied to a so-called overhead valve type packaging bag 1 having a valve opening 2 in a top portion 1a shown in FIG. 4, and is supplied from a compressed air source (not shown) as shown in the drawing. Air nozzles 1 in which compressed air is vertically arranged
6 and 17, the air is blown against the valve port 2 of the packaging bag 1, and the air flow opens the valve port 2 of the packaging bag 1, and the air is blown through the opening to remain inside the valve port 2. The flour and the like that have been used are scattered and eliminated.

Here, when the packaging bag 1 is a side-valve type packaging bag 3 having the gusset 5 shown in FIG. 5 and having the valve opening 4 at the upper front corner, the inside of the valve opening 4 is crushed. And a plurality of air nozzles of the first air blow device 15 are formed so that the shape of the hitting plate 14 that contacts and presses the valve port portion 4 is inclined so that a portion substantially free of powder particles is formed. By forming the inclines 16 and 17 so as to be substantially parallel to the valve opening 4 of the packaging bag 3, it is possible to carry out exactly the same manner.

On the downstream side of the first air blow device 15,
A guide plate 18 is arranged to abut and guide the valve port 2 of the packaging bag 1 conveyed by the second conveyor 12.
The guide plate 18 prevents the granular material compacted inside the valve port 2 of the packaging bag 1 from being collapsed due to the vibration caused by the conveyance. Therefore, this guide plate 1
In many cases, there is no particular problem even if 8 is omitted. Then, the packaging bag 1 conveyed by passing through the guide plate 18 by the second conveyor 12 is provided close to the end of the guide plate 18, and is arranged at a position facing the valve port 2 of the packaging bag 1. The air is blown by the second air blow device 19.

FIG. 2B shows the second air blow device 19.
It is a figure which shows the detail of. This second air blow device 19
Is an overhead valve type packaging bag 1 having a valve opening 2 in the top portion 1a of the packaging bag shown in FIG.
As shown in the drawing, compressed air supplied from a compressed air source (not shown) is blown out from a plurality of air nozzles 20, 21, 22 arranged in a vertical direction to open a valve of the packaging bag 1. The air flow blows the opening 2 to open the valve opening 2 of the packaging bag 1, and at the same time, the inside of the opening is air blown to remove the powder particles such as flour remaining inside the valve opening 2. It scatters and eliminates the body.
Here, in the lower part of the inside of the valve opening 2, the powdery particles easily accumulate and are hard to be removed.
Are disposed obliquely downward, and the air blow by the air nozzle 22 surely scatters and removes the powdery particles remaining in the lower corner inside the valve port 2 (corner cleaning step).

Further downstream of the second air blow device 19, an adhesive (not shown) of the valve port 2 is heated and melted at a position where the adhesive comes into contact with the valve port 2 of the packaging bag 1. A hot plate 23 for sealing the valve port 2 of the packaging bag 1 is provided. The hot plate 23 seals the valve port 2 by heating and melting a hot melt adhesive applied and dried on the inner surface of the valve port 2, and is heated by a known heat source.
3 is pressed from the outside of the valve port 2, and the hot melt adhesive in the port 2 is heated to about 180 ° C to 220 ° C and melted (sealing step). At this time, since the granular material is compacted inside the valve port 2 of the packaging bag 1, the hot plate 23 can be stably pressed against the valve port 2 of the packaging bag 1.
Also, the walls of the compacted granular material have a higher density on the lower side and are often formed as a whole as a whole. It is desirable that the hot plate 23 be inclined inward in accordance with the inclination of the wall of the granular material inside the packaging bag 1.

In order to reliably press the hot plate 23 against the valve opening 2 of the packaging bag 1, a known press for transporting the packaging bag 1 above the second conveyor 12 in synchronization with the second conveyor 12. The conveyor 24 is arranged. FIG. 3 is a side view showing the known press conveyor 24. As shown in FIG. As shown in the figure, the press conveyor 24 forcibly conveys the packaging bag 1 placed on the upper surface of the second conveyor 12 by pressing the packaging bag 1 from above, and also removes the powder and granules inside the packaging bag 1 from a valve. It is for filling the inside of the mouth portion 2, and can be entirely moved up and down so as to be able to cope with a variation in the thickness of the packaging bag 1.
It is biased downward by a spring device (not shown).

Further, a forced pressing device 25 is disposed at a position facing the hot plate 23 across the second conveyor 12. The forcible pressing device 25 includes a stopper plate 26 that protrudes above the second conveyor 12 and locks the packaging bag 1, and an air cylinder 27 that projects and retracts the stopper plate 26. At the position where 2 contacts the hot plate 23, the movement of the packaging bag 1 is locked by the stopper plate 26,
The packaging bag 1 is rotated in a state where the valve port 2 of the packaging bag 1 is in contact with the hot plate 23 by the conveying force between the second conveyor 12 and the press conveyor 24, and the valve port 2 is pressed strongly against the hot plate 23. By rotating, the hot melt adhesive is reliably heated and melted for sealing.

When the packaging bag 1 is rotated by a predetermined angle, the air cylinder 27 is retracted and the stopper plate 26
Is released, and the packaging bag 1 is transported by the second conveyor 12 and the press conveyor 24. Valve port 2 of packaging bag 1 taken out of hot plate 23
Is a valve opening of the packaging bag 1 which is heated and melted by the hot plate 23 and sealed by the cooling plate 28 arranged on the downstream side of the hot plate 23 at a position facing the valve opening 2 of the packaging bag 1. 2 is cooled to solidify the hot melt adhesive, and as shown by the arrow B, is discharged from the mouth sealing device. However, since the valve port portion 2 of the packaging bag 1 sealed by being heated and melted by the hot plate 23 can be cooled without using the cooling plate 28, the cooling plate 28 is not used. It is also possible. When the hot plate 23 is arranged to be inclined inward in accordance with the inclination of the wall of the granular material inside the packaging bag 1, it is desirable that the cooling plate 28 is also arranged to be inclined at the same angle.

The apparatus and method for sealing a packaging bag according to this embodiment described in detail above are merely examples of the present invention, and the present invention is not limited to these. It goes without saying that various improvements and changes may be made without departing from the spirit of the present invention.

[0030]

As described above in detail, according to the apparatus and method for sealing a packaging bag of the present invention, a small amount of powder particles adhere and remain inside the valve opening of the packaging bag. Thus, it is possible to realize a mouth-sealing device and a mouth-sealing method that can completely seal the valve mouth portion of the packaging bag without performing. Further, according to the present invention, on the high-speed conveyor line for transporting the packaging bag, the valve opening of the packaging bag can be sealed in a short time, and in fact, the speed of the conveyor is increased. And a sealing device which can improve the conveyor speed to about 1.4 times the conventional conveyor speed, securely seals the valve opening, and prevents the powder and granules from leaking during transportation and storage, and a sealing method. Was realized.

[Brief description of the drawings]

FIG. 1 is a plan view showing the entire configuration of a packaging bag mouth-sealing device according to an embodiment of the present invention.

FIG. 2 is a view showing details of an air blow device,
(A) shows details of the first air blow device, and (b) shows details of the second air blow device.

FIG. 3 is a side view showing a known press conveyor 24.

4A and 4B show an overhead valve type packaging bag, wherein FIG. 4A is a plan view of the packaging bag, and FIG. 4B is an explanatory view showing a state in which a predetermined amount of granular material is filled.

FIGS. 5A and 5B show a side-valve type packaging bag, wherein FIG. 5A is a plan view of the packaging bag, and FIG. 5B is an explanatory view showing a state in which a predetermined amount of granular material is filled.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Overhead valve-type packaging bag 1a Top part 2 Valve port part 3 Side valve-type packaging bag 4 Valve port part 5 Gazette 11 First conveyor 12 Second conveyor 13 Pusher plate 14 Contact plate 15 First air blow device 16, 17 Air nozzle 18 Guide plate 19 Second air blow device 20, 21, 22 Air nozzle 23 Hot plate 24 Press conveyor 25 Forced pressing device 26 Stopper plate 27 Air cylinder 28 Cooling plate

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Daisuke Ito 3-1 Okawacho, Kawasaki-ku, Kawasaki-shi, Kanagawa Nisshin Flour Milling Co., Ltd. F-term (reference) 3E094 AA12 BA08 CA29 CA30 DA08 EA06 FA05 FA22 GA05 GA11 HA01 HA08

Claims (11)

[Claims] 1. A conveyor line formed by arranging a first conveyor and a second conveyor in an L-shape, and an inclined position provided on the first conveyor, wherein a valve port of a packaging bag is at a forefront position. A pusher plate that inclines the posture so as to convey, a hitting plate that comes into contact with the packaging bag in the inclined posture, and stops conveyance on the first conveyor, and is disposed orthogonal to the first conveyor. And the second conveyor for carrying out the packaging bag in the inclined posture stopped at the hit plate, and an air blow device disposed on a side surface of the second conveyor at a position facing a valve port of the packaging bag. A hot plate disposed downstream of the air blow device at a position in contact with a valve port of the packaging bag to melt and seal an adhesive at a valve port of the packaging bag; and Facing the second conveyor A forcible pressing device for rotating the packaging bag at a position where the valve opening of the packaging bag abuts on the hot plate and pressing the packaging bag against the hot plate. apparatus. 2. The hitting plate is formed in an S-shape,
The packaging bag mouth-sealing device according to claim 1, wherein the valve opening of the packaging bag is removed and brought into contact with the packaging bag to stop the transportation of the packaging bag by the first conveyor. 3. The packaging bag mouth-sealing device according to claim 1, wherein a guide plate for guiding the packaging bag is arranged between the hit plate and the hot plate. 4. The air blow device includes two air blow devices, one of which is disposed at a front end (upstream side) of the hit plate.
The other one is arrange | positioned at the rear end part (downstream side) of the said guide plate, The mouth-sealing apparatus of the packaging bag of any one of Claims 1-3 characterized by the above-mentioned. 5. The air blow device has a plurality of air nozzles, and at least one of the plurality of air nozzles includes:
The air bag nozzle according to any one of claims 1 to 4, wherein the air nozzle is an air nozzle arranged obliquely downward. 6. A valve disposed on the downstream side of the hot plate at a position facing the valve opening of the packaging bag, and cooling the valve opening of the packaging bag sealed with the hot plate to apply an adhesive. The sealing device for a packaging bag according to any one of claims 1 to 5, wherein a cooling plate to be solidified is arranged. 7. A packaging bag closing device for heating and sealing a valve opening of a packaging bag on a conveyor line, wherein the packaging bag on the conveyor line is inclined at a predetermined angle, and A posture changing step of changing the valve opening of the packaging bag into an inclined position to project to a predetermined position; and cleaning by removing the powder in the valve opening by air blowing to the valve opening of the packaging bag in the inclined position. And a sealing step of sealing the packaging bag from which the powder in the valve opening has been removed. 8. The packaging bag for changing the posture of the packaging bag, locking the packaging bag at a position where the valve port is removed, and temporarily stopping the transportation of the packaging bag. The method according to claim 7, further comprising a locking step. 9. The cleaning step includes a plurality of air blow devices, each of the plurality of air blow devices having a plurality of air nozzles, and at least one of the plurality of air nozzles is inclined. An air nozzle arranged downward, comprising a corner cleaning step of removing powder remaining in a lower corner of the valve opening of the packaging bag. Mouth sealing method. 10. In the sealing step, a hot-melt adhesive previously applied to a valve opening of the packaging bag is heated and melted by a hot plate to seal the valve opening of the packaging bag. The method for sealing a packaging bag according to any one of claims 7 to 9. 11. The method according to claim 10, wherein the sealing step includes a cooling step of cooling a valve opening of the packaging bag sealed with the hot plate to solidify the adhesive. How to seal the packaging bag.