JPS6238201B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a powder/granular material filling device in which a packaging bag with a valve is set, and the powder/granular material is loaded into the packaging bag through a filling pipe of the device inserted into the valve opening. After filling a predetermined amount, the bag holder of the device that supports the bag at its bottom is tilted forward and downward, and when the bag is removed from the filling pipe, its valve port is opened. The present invention relates to an adhesive sealing method and an apparatus therefor.

When a packaging bag with a valve is set in a powder or granule filling device and the filling pipe of the device is inserted into the valve opening and a predetermined amount of powder or granules is filled, the bag is The bag holder of the device supported by the device is tilted forward by the forward downward tilting motion, and then, as it falls due to its own weight, the filled powder and granules move inside the bag and are pushed out to the valve part. Since the valve opening is automatically sealed by pressing the valve opening from the inside, conventionally, it has been customary not to apply sealing such as gluing. However, the sealing effect of such a valve port is not perfect, and movement of the powder near the valve part that presses the valve part from the inside against the outer layer of the packaging bag occurs during bag handling and transportation. and,
There is a gap in the valve opening, which could cause the powder or granules inside the bag to spill out, or conversely, pests could enter the bag. Next, apply an appropriate amount of adhesive to the inner surface of the valve port by spraying it through a pore or slit provided on the outer circumferential surface of the portion near the base of the filling tube, or apply adhesive to the inner surface of the valve port in advance. is applied and dried, and the inner surface of the valve opening portion is brought into contact with a humidifying portion that exudes an active liquid that activates the adhesive properties of the adhesive provided on the outer circumferential surface near the base of the filling tube as described above. Then, when the filled bag is removed from the filling tube by the above-mentioned tilting operation of the bag holder, the powder particles inside are removed. A method is used in which the valve portion is pressed by pressure applied from the body to actively seal the valve opening.

However, when using the former method, when the filled bag is removed from the filling tube, the powder remaining on the outer surface of the filling tube is dragged into the valve part and wetted by the adhesive. There is a risk of clogging the pores or slits in the filling tube.
When filling and bagging work is carried out continuously,
It is unlikely that the powder or granules will stick to the pores or slits due to the adhesive and become clogged, but if the work is interrupted for a long time and then resumed, the powder or slits will be completely removed during that time. There is a drawback in that the clogging caused by the sticking cannot be removed by simply spraying compressed air, and the pores or slits must be manually cleaned each time.

When using the latter method, compressed air is injected through the pores or slits each time the adhesive is injected, or the work is made for a slightly longer time in order to prevent the adhesive injection pores or slits from becoming clogged. This eliminates the trouble of having to manually perform these cleaning operations when the process is interrupted and resumed, but if the filling and bagging work is performed continuously, the filled bags may become unfilled as described above. When the tube is removed, the inner circumferential surface of the valve opening, which has been wetted with the active liquid and whose adhesive properties have been activated, comes into partial contact with the filling tube, so the surface gradually becomes sticky with the adhesive. . As this condition progresses, the surface of the expansion tube section (described later) will also become wet with the adhesive, and a portion of the valve opening that will be in close contact with the expansion tube section to which the adhesive has adhered will adhere during powder filling. If the filled bag is tilted as described above and removed from the filling tube, only the valve opening may be torn off, resulting in a situation where the bag is left stuck in the filling tube.

Although such a fatal situation does not always occur, it is a problem that can occur even when using the former method described above.

The present invention has been made in order to solve the problems in the conventional method of gluing and sealing the valve opening after the powder is filled with the powder filling device described above, and the problems in the device. , Use a packaging bag with a valve whose inner surface of the valve opening has been coated with adhesive in advance and allowed to dry, or use one without adhesive applied to the inner surface of the valve opening, and place powder or granular material into the valve opening. After inserting the filling pipe of the filling device and supporting the bottom part on the bag holder of the device and filling the bag with powder, the filled bag is moved forward and downward from the holder supporting the bottom of the bag. During the process of tilting the filling tube to separate it from the filling tube, the active liquid or adhesive is applied by spraying the inner surface of the valve opening for a short period of time from a spray nozzle installed near the tip of the filling tube. Then, when the bag is removed from the filling pipe by the tilting motion of the pedestal, the valve opening is adhesively sealed by the pressure applied to the valve opening from the internal powder and granules, and the same apparatus. It provides:

Hereinafter, the method according to the present invention will be explained by giving examples and referring to the drawings.

Figure 1 shows a double-end sewing bag with a check valve made of laminated kraft paper, with the upper and lower ear parts closed at the perforations, gussets 1 on both sides, and a valve part 2 in the upper right corner. 3 is shown. Figure 3, Figure 4, Figure 5
6 and 6 are explanatory diagrams showing the main parts of the apparatus for implementing the method of the present invention, FIG. 3 is a side sectional view of the filling tube and support part, and FIG. 4 is a perspective view thereof. , FIG. 5 is an external side view thereof, and FIG. 6 is a front view thereof.

The valve part 2 has a filling pipe 4 of a powder filling device.
When the bag is inserted into the bag, an adhesive is applied in advance to a portion corresponding to a tube portion adjacent to an expansion tube portion 5 (to be described later) at the time of bag making, and the bag is sufficiently dried.

When the above-mentioned adhesives are wetted with water, ethanol or other solvents, that is, activated liquids, they immediately dissolve and activate strong adhesive properties. Select the appropriate one from among natural polymers or synthetic polymers such as polyvinyl alcohol and polyvinyl ether (all of which are easily re-wetted with water). It has been done. However, for bags made of canvas, the valve part should be impregnated with polystyrene during bag manufacturing, and the valve part should be moistened using a solvent such as toluene or xylene as an active liquid during rewetting. good.

If it is difficult to pre-apply the adhesive on the inner surface of the valve opening due to the bag making process, apply the adhesive on one side of the kraft paper cut into strips, let it dry, and then apply a regular adhesive on the other side. Apply the product, fold it in half so that this part is exposed to the outside, and place the overlapped ears in bag 3.
The bag may be sewn in at the same time as the ears of the bag to form an adhesive valve opening 6 and fixed at the position where the adhesive is applied to the valve part 2, and the bag shown in FIG. There is.

A filling pipe 4 into which the valved packaging bag 3 configured as described above is inserted through its valve opening when filling powder or granular material.
is fixed to the measuring frame 7 of the filling device in a cantilevered manner via a flange portion 8, its front end is bent into a beak shape, and the lower half forms an injection port 9 for powder and granular material,
Although not shown, a powder delivery pipe is connected to the rear end via a flexible pipe joint, and the powder is transported from the powder hopper of the filling device by a screw conveyor (not shown). The supplied powder and granular material is extruded into the filling pipe 4 together with compressed air.

The expansion tube part 5 adjacent to the injection port 9 is a part covered with a rubber tube fixed at both ends, and is expanded into a lemon shape by the compressed air sent from the thin tube A, and the valve part 2 of the bag 3 is expanded. It holds the bag 3 together with the bag holder 10 provided at the bottom of the weighing frame 7, and at the same time, the powder and granules pushed out by compressed air from the inlet 9 of the filling tube 4 are exposed to the outside. It also serves as a seal to prevent it from scattering. One end of the thin tube B opens to the injection port 9, and the other end is connected to a conduit (not shown) that is opened to the outside air via a filter. This is to exhaust air that cannot be released from the kraft paper itself. The tubule L is
It extends along the inner surface of the filling tube 4 to its tip, and projects slightly outward from the upper end of the injection port 9, and an injection nozzle 11 is screwed into the end. Although not shown, the thin tube L is electromagnetically connected to a water or ethanol storage tank that is constantly pressurized with compressed air regulated to a predetermined pressure (for example, 2 kg/cm ² G). connected via an on-off valve (not shown),
Pressurized water or pressurized ethanol is supplied to the injection nozzle 11 by opening this electromagnetic on-off valve for a short time by operating a micro switch and a timer, which will be described later. The injection nozzle 11 has 4 to 6 pores equally distributed on its outer circumferential surface, and when the pressurized water or pressurized ethanol described above is supplied from the thin tube L, it is atomized into the pores. It is injected radially outward from the source. Needless to say, water or ethanol in this case is the activating liquid for the adhesive.

As shown in FIGS. 5 and 6, a pair of dogleg-shaped levers 12 are rotatably attached to the weighing frame 7, and the longer arm is connected to a rod 13 at its upper end. The shorter arm is connected to a micro switch 14, which is disposed oppositely on one side of the rear part of the weighing frame 7, upper and lower.
The 15 contacts are pressed and activated by rotating the lever 12 counterclockwise or clockwise. Lever 12
is, when no external force acts on it, from its own weight and center of gravity to its rotation axis.
As shown in the figure, a clockwise moment is always applied.

The bag holder 10 has a support shaft 1 fixed thereto.
The support shaft 16 is tiltably attached to the weighing frame 7 via a support shaft 6, and the support shaft 16 is connected to an operating rod of an air cylinder through a link (not shown) fixed thereto. The cradle 10 is arranged to maintain a horizontal position when the actuating rod is pushed out, and to maintain an inclined position when it is retracted.

As shown in FIG. 13 is pressed by the gusset 1 of the bag 3, the lever 12 is rotated counterclockwise, its short arm presses down the contact of the micro switch 14, and the switch 14 is closed. By operating this switch 14, compressed air maintained at a predetermined pressure is supplied from the thin tube A to the expansion tube section 5.
At the same time, it is also fed into the air cylinder mentioned above, and its operating rod is pushed out.
Therefore, as described above, the expansion pipe section 5 comes into close contact with the inner circumferential surface of the valve section 2, and holds the bag 3 together with the bag holder 10 which has returned to the horizontal position. (See Figure 7) Compressed air is then supplied to the pipe line connected via the above-mentioned flexible pipe joint, thereby causing the powder to flow into the filling pipe 4.
The air is pushed out from the inlet 9 together with compressed air into the bag 3, and is gradually filled.The excess air brought into the bag 3 passes from the thin tube B through the pipe line as described above, and is contained by the filter. The powder and granules are removed and discharged to the outside air.

The powder and granular material filled into the bag 3 in this manner is automatically weighed via the weighing frame 7. When the measured value reaches the set value, the discharge of the powder and granules is stopped, and the pressurized air in the expansion tube section 5 is discharged to the outside air from the thin tube A through the conduit connected thereto. is contracted.

Then, the pressurized air supply circuit to the air cylinder is switched, its actuating rod is retracted, the pedestal 10 holding the bottom of the bag 3 is tilted downward, and the bag 3 filled with powder and granules is released. Due to its own weight, it falls tilting as shown in Figure 9.

In this case, the lever 12, which is in contact with the gusset 1 of the bag 3 by the rod 13, is always subjected to a clockwise moment with respect to its rotation axis, so that the lever 12 is in contact with the gusset 1 of the bag 3. Follows the tilting movement. During the tilting of the bag 3, the injection nozzle 11 provided near the tip of the filling tube 4 is inserted into the valve opening 6.
Once inside, the short arm of lever 12 presses the contact of microswitch 15, activating this switch. By the operation of this switch 15, the electromagnetic on-off valve attached to the conduit connected to the thin tube L and the timer connected thereto are activated, and the pressurized water or pressurized ethanol is supplied for a short period of time (for example, 0.1 to 0.3 seconds). ) while the injection nozzle 11 is inside the valve port 6,
The supplied active liquid is atomized from the nozzle 11 and sprayed onto the inner surface of the valve port 6. The adhesive-applied surface of the adhesive valve port 6 that has been sprayed with this active liquid is wetted with this active liquid, and strong adhesiveness is immediately activated.

The injection start timing of the nozzle 11 is when the nozzle 11 is positioned at the valve opening 6 due to the tilting of the bag 3, and the injection end timing, that is, the injection duration time is when the nozzle 11 is positioned at the valve opening 6. It is to be taken within the elapsed time from when it is released. For the former timing, a test is conducted in advance so that the tilt position of the bag 3 at that point can be detected by the lever 12, and the position of the stopper 17 is adjusted as shown in FIG. When the arm of the microswitch 17 contacts the stopper 17, the contact of the microswitch 15 may be simultaneously pressed by this arm. Further, the injection duration may be appropriately determined in advance through a test, and the above-described timer may be set.

As shown in FIG. 9, the filled bag 3 is tilted on the bag holder 10, falls under its own weight as described above, and is received, for example, on a belt conveyor. Since the body presses the valve part 2, as mentioned above,
The adhesive-applied surfaces of the adhesive valve port portion 6, which have already activated strong adhesive properties, are firmly adhered to each other, and the valve port is sealed.

Incidentally, the injection nozzle 11 is naturally exposed to the powder discharged from the inlet 9 during filling of the powder, but for example, when the powder is flour,
If ethanol is used as the active liquid, clogging of the nozzle 11 caused by flour can be avoided since ethanol and wheat flour are not compatible.

The valve opening 6 is adjusted according to the powder and granular material to be filled in this way.
It is desirable to appropriately select the adhesive to be applied in advance and its active liquid.

In addition, in the above-described embodiments, the case where the package 3 is used is described in which the inner surface of the valve port part is coated with adhesive in advance and dried, but when the package body 3 is used in which the inner surface of the valve port part is not coated with adhesive. In this case, the adhesive may be stored in the above-mentioned sealed tank and sprayed from the nozzle 11 in the same manner as described above to apply it to the inner surface of the valve opening. However, in this case,
Since the adhesive has a higher viscosity than the active liquid, it is necessary to increase the pressure to about 3 to 5 kg/cm ² .

Alternatively, an air-driven variable stroke plunger pump may be used for pressurized supply of the active liquid or adhesive, and the jetting duration time of the nozzle described above may be set by adjusting the plunger stroke. In any case, depending on the type of powder or granule to be filled, the work may be interrupted for a rather long time, and when restarting, the powder or granule in the nozzle 11 may be stuck by the active liquid or adhesive, causing eye damage. Although clogging may occur, the nozzle 11 can be easily replaced and its cleaning is easier than in conventional filling tubes 4 in which the nozzle pores or slits are provided within themselves.

As is clear from the above description of the structure and operation of the apparatus for carrying out the method of this application, the method of filling a powder or granular material into a packaging bag with a valve and the apparatus according to the present invention are as follows. When filling bags with powder or granules is carried out continuously for a long period of time, a part of the filling tube is wetted with adhesive as in conventional equipment, and the valve opening of the bag is wetted with adhesive during filling of the powder or granules. is glued to the filling tube, and when the filled bag is tilted by the forward downward tilting motion of the bag holder supported at the bottom and removed from the filling tube, the valve opening part is torn apart. This eliminates the possibility of a fatal situation where the powder gets stuck in the filling pipe and gets stuck in the filling pipe.If the work is interrupted for a long time and then restarted, the powder or granules may be removed by the active liquid or adhesive from the nozzle. Even if it sticks to the pores and causes clogging, it is easy to clean, and it is also easy to replace just the nozzle, which simplifies the manual work required to clean conventional equipment. It is.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an example of a packaging bag with a valve, Fig. 2 is a partial perspective view showing the valve portion thereof, and Fig. 3 is a filling pipe and its support, which are the main parts of the embodiment device according to the present invention. FIG. 4 is a perspective view of the unit, FIG. 5 is a side view of its external appearance, FIG. 6 is a front view of the unit, and FIGS. 7, 8, and 9 show the operating order of the device. It is an explanatory diagram. 1...gusset, 2...valve part, 3...packaging bag with valve, 4...filling pipe, 6...adhesive valve opening part, 10...
...bag holder, 11...spray nozzle, 12...dog-shaped lever, 14, 15...micro switch.

Claims (1)

[Scope of Claims] 1. Use a packaging bag with a valve whose inner surface of the valve opening has been coated with adhesive and dried, or a packaging bag with no adhesive applied to the inner surface of the valve opening,
Insert the filling pipe of the powder/granular material filling device into the valve opening, and support the bottom of the tube on the bag holder of the device. After filling the bag with powder, the filled bag is supported by the bottom. In the process of tilting the pedestal in a forward and downward direction and separating it from the filling tube, active liquid or adhesive is sprayed onto the inner surface of the valve opening for a short period of time from an injection nozzle installed near the tip of the filling tube. It is applied by spraying, and then when the bag is removed from the filling tube by the tilting action of the cradle, the adhesion of the valve opening is caused by the pressure applied to the valve opening from the powder inside. A method for filling powder into a packaging bag with a valve, which is characterized by forming a seal. 2. After the valved packaging bag is filled with powder or granule through a powder or granule filling pipe inserted through its valve opening, the bag holder supporting the valved packaging bag at its bottom is tilted. An active liquid or adhesive is applied to the inner surface of the valve port and dried to activate the adhesive near the tip of the filling tube that the valve port comes into contact with when the valve is tilted and removed from the filling tube. An injection nozzle for spraying and coating for a short time is provided on the inner surface of the opening, and when the injection nozzle is located inside the valve opening during the tilting of the bag performed by the operation of the holder after filling the powder or granular material, A device for filling powder and granular material into a packaging bag with a valve, comprising means for detecting the inclination position of the bag and regulating the injection timing of the nozzle. 3. When the injection nozzle is located inside the valve opening part during the tilting of the bag by the bag holder of the device, which is performed after the filling pipe of the powder or granular material filling device fills the valved packaging bag with powder or granular material. Detects the tilted position of the bag,
A means for regulating the injection timing of the nozzle,
A packaging bag with a valve according to claim 2, comprising a dogleg-shaped lever whose one end contacts the gusset of the bag and rotates following the inclination of the lever, and a microswitch which is operated at the other end. Powder filling equipment.