JPS6317691B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention provides a method for setting a side-valve type packaging bag, particularly one in which an adhesive is coated and dried on the inner surface of the valve opening, in a powder filling device. After inserting the filling pipe into the valve opening and filling the filled packaging bag with powder, the filled packaging bag is tilted forward and diagonally downward to support the holder of the device at its bottom. When the valve opening is adhesively sealed at a suitable place during the conveying process in which the valve opening is separated from the filling pipe and transported by being dropped onto a conveyor, the valve opening is cleaned beforehand. It is related to the device.

[Conventional technology]

A packaging bag with a valve, in which adhesive, such as a rewetting adhesive, has been applied to the inner surface of the valve opening and dried, is set in the powder filling device, and the powder is filled, and the inner surface of the valve opening is activated. A liquid is applied to activate the adhesive properties of the adhesive, and then when the filled bag is removed from the filling tube, the valve opening is compressed by the pressure applied from the powder inside, creating a seal. This is because the filling operation in the filling device is stopped for the time required to perform the sealing operation, and the device cannot make full use of its filling capacity. , a heat-melting adhesive is used as the adhesive, the sealing operation is separated from the filling operation, and heat is applied to a suitable place during the transportation process of the filled packaging bag, for example, in the transportation process after the packaging bag is shaped by a shaping machine. In recent years, a method has been implemented in which the overall productivity of filling and bagging powder is improved by activating the adhesive by heating and pressing with a plate and sealing the valve opening by gluing the valve opening.

It is true that the method of separating the sealing operation from the filling operation contributes to improving the efficiency of filling and bagging operations, but since filled packaging bags are conveyed on a conveyor without adhesive sealing, Due to the vibrations received by the valve and the pressing action of the shaping machine, the filled powder inside may slightly protrude into the valve opening. Therefore, just before starting the preliminary operation of sealing, in which the adhesive that has been applied and dried on the valve opening is activated by heating with a hot plate, a jet stream is sprayed from an air nozzle onto the valve opening, and the adhesive is activated on the outer surface of the valve opening. At the same time, the powder adhering to the inner surface of the valve opening is removed, and the powder adhering to the vicinity of the inner inlet of the valve opening is suctioned by the negative pressure generated by the airflow flowing along the outer curved surface of the valve opening. It is designed to be discharged.

[Problem that the invention seeks to solve]

However, with this method, the inlet part of the valve port is not opened sufficiently, so it is not possible to completely remove the powder adhering to the inner surface of the valve port. Since the adhesive is activated in a state where the cleaning of the adhesive is insufficient, and then an appropriate pressing force is applied to seal the adhesive, it is impossible to eliminate all imperfections in the adhesive seal. Ta.

This invention uses a packaging bag with a valve in which an adhesive is applied and dried on the inner surface of the valve opening, and the adhesive sealing operation of the valve opening is completely separated from the filling operation using a powder filling device. This method was developed to solve the above-mentioned problems in the conventional equipment, and when spraying compressed air from an air nozzle immediately before sealing the valve port with adhesive,
It is an object of the present invention to provide a sealing device that can completely remove powder adhering to the inner surface of a valve port by opening an inlet portion of the valve port.

[Means for solving problems]

As a technical means for achieving the above-mentioned object, this invention has been developed by applying an adhesive to the inner surface of the valve opening and drying it, and transporting the filled side-valve packaging bag filled with powder onto a conveyor. In the process of transporting the filled packaging bag with the valve port facing forward and upward while supporting the bag in a horizontal state, a hot plate is provided which contacts and heats the outer surface of the valve port of the filled packaging bag. a hot plate contact/separation mechanism that brings the hot plate into contact with the packaging bag, then presses it, and then releases it; In a valve opening sealing device that performs both adhesion by pressing, a movable inclined holding plate, a movable inclined holding plate,
The gist is that a contact/separation mechanism and an injection nozzle are provided. In addition to the heating plate, the movable inclined presser plate includes:
The hot plate is provided at a similar position upstream from the conveyor position where the hot plate is provided, contacts the outer surface of the valve opening of the filled packaging bag being conveyed, and presses the outer surface of the valve opening of the filled packaging bag. . The movable inclined presser plate is inserted into a slit-shaped elongated hole formed in the movable inclined presser plate along the conveyance direction of the packaging bag,
The movable inclined holding plate is tilted relative to the movable inclined holding plate, and the movable inclined holding plate locally presses the outer surface of the valve opening shaped into the inclined plane shape. Forced to leave the club.
The approaching/separating mechanism causes the movable inclined presser plate and the movable inclined presser plate to press and release from the packaging bag in conjunction with each other. Further, the injection nozzle sprays compressed air to the valve port whose communication with the inside of the bag is interrupted by the pressing operation of the movable inclined presser plate and whose valve port is in an open state.

[Effect]

In the closure device configured as described above, when a filled side-valve packaging bag filled with powder is conveyed by a conveyor while being supported in a horizontal state with the valve opening facing forward and upward, , at a position upstream from the conveyor position where the hot plate is provided,
The outer surface of the valve opening of the packaging bag contacts the movable inclined presser plate, and the movable inclined presser plate presses the outer surface of the valve opening of the packaging bag to shape it into an inclined plane. Next, the movable inclined presser plate inserted into the slit-shaped elongated hole provided in the movable inclined presser plate locally presses the outer surface of the valve opening shaped into an inclined plane, and the contact/separation mechanism The movable inclined presser plate is rotated, and the movable inclined presser plate is separated from the inclined planar portion of the outer surface of the valve opening portion. At this time, the outer surface of the valve opening, which has been shaped into an inclined plane, is locally pressed by the movable inclined pressing plate, so that the valve opening is disconnected from the inside of the bag, and The valve port is opened. In this state, when compressed air is blown toward the valve port from the injection nozzle, the powder adhering to the inner surface of the valve port is completely removed because the valve port is open. After this, the outer surface of the valve opening of the packaging bag comes into contact with the heating plate by the hot plate contact/separation mechanism, and the outer surface of the valve opening is pressed by the hot plate, and the adhesive applied to the inner surface of the valve opening of the packaging bag is pressed. The agent is heated and activated by a hot plate, and the inner surface of the valve opening is bonded by the pressing force of the hot plate. During this adhesive sealing, since the powder has been completely removed from the inner surface of the valve opening as described above, the adhesive opening of each packaging bag is completely sealed.

〔Example〕

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

FIG. 3 shows one embodiment of the present invention, and is a perspective view showing the main parts of a sealing device incorporated in a shaping machine for a valved packaging bag filled with powder, and FIG. 4 shows its external shape. The plan view and FIG. 5 are its external front views.
This device conveys a packaging bag 1 filled with powder and temporarily stops during the cleaning operation of the inner surface of the valve opening 2, which is performed before the closing operation of the valve opening 2, and uses a belt conveyor that also serves as a holding stand. (In this example, it is a belt conveyor of a shaping machine.) Corresponding position slightly upstream from the installation position of the hot plate of the above-mentioned conventional device No. 10, that is, on the left side with respect to the conveying direction indicated by the arrow in Fig. 3. Filled packaging bags placed close together and transported (Figure 2 shows the appearance)
A movable inclined holding plate 11 that contacts and presses the outer surface of the valve port 2 of No. 1, and a slit-shaped elongated hole 12 formed in the movable inclined holding plate 11 along the conveyance direction.
a movable inclined presser plate 13 that is inserted into the movable inclined presser plate 13 and can be tilted relative to the movable inclined presser plate 11; and a connection that allows the presser plates 11 and 13 to press and release the packaging bag 1 in conjunction with each other. mechanism and
The main part is composed of an injection nozzle 14 that sprays compressed air toward the valve port 2.

The belt conveyor 10 is perpendicular to the foundation, and the packaging bags 1 are conveyed between a driving pulley 16 (see FIG. 7) rotatably supported by a pair of side plates 15 fixed in parallel to each other, and a driven pulley 17. An endless belt 10' having a width slightly larger than the belt width is stretched around it, and on the conveying side there is a receiving roller 18 which is similarly pivotally supported by a side plate 15 and rotates freely in order to support the belt 10' (see Fig. 6). ) are arranged at equal intervals, and on the return side, although not shown, there is a freely rotating tension roller which is similarly supported on the side plate 15 so that the supported position can be adjusted in the vertical direction. It is provided. Note that the roller 1 in contact with the top surface of the filled packaging bag 1 conveyed by the belt conveyor 10 as seen in FIG.
Reference numeral 9 denotes a press roller for shaping, the outer diameter of which is approximately 80% of the outer diameter of the receiving roller 18.
Note that 15' is a guide plate that guides the filled packaging bag 1 being transported in the transport direction.

The movable inclined presser plate 11 is held and fixed in a cantilever manner to a rotating drive shaft 19 for tilting the movable inclined presser plate via a tightening fixture 20 fixed to the presser plate 11.
The drive shaft 19 has a bearing portion 2 fixed to the side plate 15.
It is rotatably supported by 1. and,
The drive shaft 19 has an arm 22 attached to the shaft end extending outward from the bearing 21, and a clevis-type air cylinder (not shown) to which the side plate 15 is attached to the end of the arm 22. A fork 24, which is threadedly connected to the actuating rod 23, is connected by a pin. In FIG. 3, the actuating rod 23 is shown retracted into the cylinder, and pressurized air is supplied to the air cylinder via a directional solenoid valve (not shown) to push out the actuating rod 23. At this time, the drive shaft 19 is rotated by a certain angle in the clockwise direction indicated by the arrow by the arm portion 22, and the movable inclined presser plate 11 is accordingly tilted to the right as shown in FIG. It is designed to be maintained at the maximum downward slope (for example, about 40 degrees from the horizontal).

The movable inclined presser plate 13 has the slit-like elongated hole 12 provided in the movable inclined presser plate 11 as described above.
The rotary drive shaft 19 and the movable inclined presser plate 11 are engaged with each other as described below so that the movable inclined presser plate 11 can be tilted relative to the movable inclined presser plate 11. That is, the movable inclined presser plate 13 has the following characteristics with respect to the drive shaft 19:
The end of the extension shaft on the side opposite to the bearing portion 21 is rotatably engaged by being inserted into a hole provided in the upper left corner of the movable inclined presser plate 13. For the movable inclined presser plate 11, first, a slit-shaped elongated hole 12 is sandwiched in the movable inclined presser plate 11, a pair of support brackets 25 are fixed approximately in the center, and a pair of support brackets 25 are fixed to the upper end of the support brackets 25. , Rod side trunnion type air cylinder 2
6 is connected with a pin, and a fork 27 is connected with a screw to the tip of the operating rod of this air cylinder 26.
The movable inclined serration presser plate 13 is engaged with the fork 27 by being connected with a pin at its upper portion. When the operating rod of the air cylinder 26 is pulled into the cylinder,
As shown in FIG. 3 or FIG. 7, the movable inclined presser plate 13 is inserted into the movable inclined presser plate 11 with its lower end inserted into the slit-shaped elongated hole 12.
It is designed to maintain the same horizontal or slanted position. Therefore, the approach/separation mechanism that allows the movable inclined presser plate 11 and the movable inclined presser plate 13 to press against and detach from the filled packaging bag 1 in an interlocking manner is provided when both the presser plates 11 and 13 are engaged with each other. a rotating drive shaft 19 and an arm portion 2 that drives it;
2. A rotary actuator consisting of an air cylinder having a fork 24 and an actuation rod 23;
It is composed of a fork 27 and a linear actuator consisting of an air cylinder 26.

Next, the operation of this device will be explained, but prior to that, some additional comments will be made regarding the valved packaging bag 1 used.

The one shown in Figure 1 is a packaging bag with side valves and double bottoms made of kraft paper, which has both the top and bottom bottoms glued and has a gusset 3, and a side valve part 2 in the upper left corner. It is.

A hot-melt adhesive made of, for example, a copolymer of ethylene and vinyl acetate is heated to about 170° C., melted, and applied to the inner surface of the valve port 2, followed by drying. Then, as shown in the figure, the adhesive is applied and dried on the back side of the one-layer portion that extends from the valve opening in a tongue-like manner. This bag is economically devised, and Fig. 2 shows this side-valve double-bottomed packaging bag 1 with a predetermined amount of powder filled with a powder filling device. This is what is shown.

Now, the above-mentioned packaging bag 1 with a valve is set in the powder filling device, the filling tube is inserted into the valve part 2 from the valve opening, and after filling a predetermined amount of powder, the filled packaging bag is By tilting the cradle of the filling device supporting the bag at its bottom forward and downward, the bag is removed from the filling tube, and dropped onto the conveyor, while being conveyed by the conveyor.
After being press-shaped in a shaping machine, it is fed into this device built into the shaping machine.

This state is shown in the schematic explanatory diagram shown in FIG. A reflective sensor 28 is provided close to this device at an appropriate height position on the belt conveyor 10, so when this sensor 28 detects the filled packaging bag 1 sent in, a signal is output from the sensor 28. The direction switching solenoid valve (not shown) is actuated by this, and pressurized air is supplied to the air cylinder (not shown) to push out the actuating rod 23, causing the rotary drive shaft 19 to move in the clockwise direction indicated by the arrow. Rotate it. Therefore, the movable inclined presser plate 11 and the movable inclined presser plate 13 are integrally moved toward the drive shaft 19 in the direction of the arrow shown by the dashed line, that is, clockwise.
is rotated about the axis of rotation, and held at the maximum inclination position of approximately 40° with respect to the horizontal shown in FIG.

Even during this operation, the belt conveyor 10 continues to travel in the right direction as shown by the arrow, so the movable inclined presser plate 11 and the movable inclined presser plate 13 move as shown in FIG. Then, it is pushed by the filled packaging bag 1 which is moving forward to the right. Then, due to the force applied from the packaging bag 1, a counterclockwise torque acting on the drive shaft 19 via the movable inclined presser plate 11 is transmitted from the actuating rod 23 to the drive shaft 19 via the arm portion 22. When the movable inclined pressing plate 11 is able to overcome the clockwise torque applied to the packaging bag 1, it is rotated counterclockwise as shown by the arrow while pressing the packaging bag 1, and as shown in FIG. and move to an inclined position at an angle of approximately 25°.

By the way, a sensor switch is attached to the air cylinder that pushes out the actuating rod 23 on the outside along the axis of the cylinder so that the mounting position can be adjusted freely, and a magnet piece fixed to the piston is attached to the sensor switch. A switch is used that moves together with the piston and closes the switch when the piston reaches the mounting position. Therefore, in response to the counterclockwise rotational movement of the movable inclined presser plate 11, the piston is pushed together with the actuating rod 23, and the magnet piece fixed thereto actuates the sensor switch. The operation of this sensor switch causes the drive motor (not shown) of the belt conveyor 10 to stop (A) and the operating rod 23 to stop (A).
Switching (B) of pressurized air supplied from a pipe line in which the pressurized air of the air cylinder that pushes out the air is at a pressure one step higher than the previous supply pressure, to the air cylinder 26 that drives the movable inclined presser plate 13. supply of pressurized air via a directional solenoid valve (not shown)
Four operations are performed: (C) and activation of a timer (not shown) (D). Therefore, as shown in FIG. 8, as shown in FIG. 8, the movable inclined presser plate 11 actively applies a pressing force to the filled packaging bag 1 that has been stopped as a result of the A action. , the outer surface of the valve port 2 is shaped into an inclined plane.

In this case, since the press roller 19 for shaping shown in FIG. 6 continues to be in contact with the top surface of the filled packaging bag 1, the belt conveyor 1
0', there is a static friction force of sufficient magnitude between
The pressing force of the movable inclined presser plate 11 is
It works effectively. Then, as the operating rod is pushed out from the air cylinder 26 by the C operation, the movable inclined serration holding plate 13 is formed into a slit-like shape at the valve opening 2 which is formed into an inclined planar shape by the movable inclined holding plate 11. Pushed down from hole 12,
Apply localized strong pressure.

The pressing force applied from the air cylinder 26 to the outer surface of the valve port 2, that is, the inclined plane portion, is
A reaction force of the same magnitude is applied to the air cylinder 26, and this reaction force acts on the movable inclined holding plate 11 to pull it up via a pair of support brackets 25 connecting the air cylinder 26 with a pin, As a result, a counterclockwise torque is applied to the drive shaft 19 from the movable inclined presser plate 11 .

Since this counterclockwise torque is larger than the clockwise torque acting subsequently on the drive shaft 19 via the arm portion 22,
The actuating rod 23 is completely retracted into the cylinder despite the pushing force exerted on it by the piston, and the movable inclined holding plate 11 is rotated counterclockwise as shown in FIG. and held in a horizontal position.

In this way, the valve opening portion 2 of the filled packaging bag 1 is shaped into an inclined plane shape by applying a pressing force by the movable inclined presser plate 11, and then this inclined plane portion is shaped into an inclined plane shape by the movable inclined presser plate 13. While being locally strongly pressed by the movable inclined presser plate 11
When released from the pressure, the valve port of the valve port portion 2 is kept sufficiently open due to the elastic deformation of the kraft paper constituting it, as shown in FIG.
The communication between the valve port 2 and the inside of the packaging bag 1 is then cut off. When the valve port 2 reaches this state, the time limit operation of the timer activated by the D operation ends, so that the signal from the timer causes the injection nozzle 14 to flow toward the valve port. blowing compressed air for a certain period of time, returning the movable inclined presser plate 11 and the movable inclined presser plate 13 to the state shown in FIG. 3 by switching the electromagnetic valves respectively connected to both air cylinders, and The operation of the drive motor of the belt conveyor 10 is restarted as a sequence operation.

Therefore, in the filled packaging bag 1, before the sealing operation, the valve opening portion 2 is cut off from communication with the inside of the bag, and the valve opening is sufficiently opened and maintained in this open state. Since the compressed air is blown onto the valve port 2, the powder adhering to the inner surface of the valve port 2 is completely removed. In this case, the valve port 2
Needless to say, the outer surface of the body will also be purified.

Next, in the latter stage of the sealing operation, heating of the valve opening by pressing a hot plate against the outer surface of the valve opening, activation of the hot melt adhesive, and adhesive sealing are performed sequentially in a very short period of time, as in the past. The valve opening is completely sealed with adhesive. Moreover, according to this device, since the valve port 2 can be kept open for a certain period of time, if the active liquid is sprayed onto the valve port following the compressed air, methanol or other solvents can be sprayed onto the inner surface of the valve port 2. In other words, it is possible to use a packaging bag 1 that has been previously coated with a so-called rewetting adhesive that immediately dissolves and activates strong adhesive properties when wetted with an active liquid and is dried. can be used for spraying the active liquid. Therefore, it is desirable to apply an adhesive that uses methanol or the like as the active liquid, which easily evaporates. For filled packaging bags, the inner surface of the valve opening is cleaned, the adhesive applied and dried on the inner surface of the valve opening is activated, and the valve is removed using a hot plate (in this case, the temperature of the hot plate is lowered appropriately). By repeating the adhesion by pressing the mouth in this order, 100% complete mouth sealing can be achieved efficiently.

〔Effect of the invention〕

Since the present invention is constructed and operates as described above, the sealing device for a packaging bag with a valve according to the present invention performs the sealing operation so that the filling capacity of the powder filling device can be fully utilized. It is separate from the filling operation, and unlike conventional methods, it is designed to actively purify the inner surface of the valve opening before the sealing operation and completely remove the powder adhering to it. This makes it possible to completely seal a packaging bag with a valve 100% regardless of the type of powder to be filled.

[Brief explanation of the drawing]

1 and 2 are a front view of the external appearance and a perspective view of a packaging bag with a valve used in the sealing device for a packaging bag with a valve according to the present invention, and a perspective view of the bag filled with a predetermined amount of powder, and FIG. , which shows one embodiment of the present invention, is a perspective view showing the main parts of a closure device for a packaging bag with a valve, FIG. 4 is a plan view of its outline, FIG. 5 is a front view of its outline, and FIGS. 8 and 9 are explanatory diagrams showing the operating states of this device, respectively. 1...Packaging bag with valve, 2...Valve opening, 10...
Belt conveyor (transport conveyor), 11...Movable inclined presser plate, 12...Slit-shaped elongated hole, 13...
Movable inclined presser plate, 14...Injection nozzle, 1
9...Rotation drive shaft, 26...Air cylinder.

Claims (1)

[Claims] 1 Adhesive is applied to the inner surface of the valve opening and allowed to dry, and the filled side-valve packaging bag filled with powder is supported horizontally by a conveyor with the valve opening facing forward and upward. In the process of transporting
a hot plate that contacts and heats the outer surface of the valve opening of the filled packaging bag being conveyed; and a hot plate contact/separation mechanism that brings the hot plate into contact with the packaging bag, then presses it, and then separates it. A valve opening sealing device that performs both activation by heating of the adhesive applied to the inner surface of the valve opening of the packaging bag and adhesion by pressing the valve opening,
Separately from the hot plate, a hot plate is provided at a similar position upstream from the conveyor position where the hot plate is provided, and contacts the outer surface of the valve opening of the filled packaging bag being conveyed, and the hot plate contacts the outer surface of the valve opening of the filled packaging bag. a movable inclined presser plate that presses the outer surface of the valve opening portion; and a movable inclined presser plate that is inserted into a slit-like elongated hole formed in the movable inclined presser plate along the conveyance direction of the packaging bag, and is tilted relative to the movable inclined presser plate. and a movable inclined presser plate that locally presses the outer surface of the valve port portion shaped into an inclined plane shape by the movable inclined presser plate and at the same time separates the movable inclined presser plate from the inclined plane portion. a contact/separation mechanism that allows the movable inclined presser plate and the movable inclined separator plate to press and release from the packaging bag in conjunction with each other; 1. A sealing device for a packaging bag with a valve, comprising an injection nozzle that sprays compressed air into a valve port portion in which communication with the valve is interrupted and the valve port is in an open state.