JPS6346339Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a closure device for a side-valve type packaging bag having a valve opening at the upper front corner of the bag body.

[Conventional technology]

The packaging bag with a valve includes a so-called overhead valve type packaging bag 1' having a valve opening 3' at the top as shown in FIGS. 6A and B, and a valve at the upper front corner as shown in FIGS. 5A and B. Side valve type packaging bag 1 having a mouth portion 3 and a gusset 4
There is a sealing device for filling the former overhead valve type packaging bag with powder and granules.
As shown in the publication, during the process of conveying the filled packaging bags on the conveyor, the conveyance is stopped, the filled packaging bags are pressed from the top and sides to shape them, and at the same time, the conveyor Although a device in which a hot plate is brought into contact with the valve opening is known, when the latter type of side valve type packaging bag is filled with powder, it is not possible to seal the opening with this device. Therefore, in order to seal the latter side-valve packaging bag, a rewetting adhesive, such as a rewetting adhesive, is applied to the inner surface of the valve opening, and the side-valve packaging bag, which has been dried, is set in a powder filling device. After that, an active liquid is applied to the inner surface of the valve opening to activate the adhesive properties of the adhesive, and when the filled bag is removed from the filling tube and external pressure is applied, the powder inside is removed. Conventionally, a powder filling device has been used in which a valve opening is compressed by the pressing action of the internal pressure of the granules, and the activated adhesive seals the valve opening.

[Problem that the invention attempts to solve]

However, in a powder filling device incorporating such a sealing mechanism, it is necessary to pause the filling for a while when performing the sealing operation, so that the filling capacity of the device cannot be used to its full capacity. Therefore, there has been a demand for some kind of measure to improve the productivity in filling bags with powder and granules. Furthermore, since the valve opening is sealed by the internal pressure of the filling bag, reliable pressure cannot be applied to the valve opening, resulting in an unstable seal in many cases.

This invention was made in response to the above-mentioned request, and it completely separates the sealing work in the conventional device from the filling work, and the valve opening part is completely separated from the filling work in the conventional device. The above-mentioned method is applied to a side-valve packaging bag using a hot-melt adhesive that has been applied and dried in advance, and then heated by pressing a hot plate closely against the outer surface of the valve opening for a short time. It is an object of the present invention to provide a closure device for a side valve type packaging bag, which activates the adhesive and seals the valve opening with adhesive.

[Means for solving problems]

In order to achieve the above-mentioned object, this invention configures a closure device for a side valve type packaging bag as follows. That is, a valve opening is formed at the upper front corner of the bag, and a hot-melt adhesive is applied to the inner surface of the valve opening and dried to adhere, and the powder is filled into a side-valve packaging bag. A lower belt conveyor conveys filled packaging bags with the valve opening facing forward and upward in the conveying direction; A vertically movable upper belt conveyor that moves in the same direction and at the same speed as the belt conveyor and presses the top surface of the filled packaging bag with a constant pressure so that the side edge does not touch the valve opening, and the upper and lower belt conveyors. A sealing device for a side valve type packaging bag, comprising: a hot plate that is driven to contact the outer surface of the filled packaging bag in a pressed state at the valve opening forming position of the filled packaging bag and then to be driven to separate; The gist is:

[Effect]

In the side-valve type packaging bag closure device configured as described above, the valve opening is brought into a bulging state by being conveyed in a press-shaped state by the upper belt conveyor and the lower belt conveyor that do not cover the valve opening. Since the hot plate is brought into contact with the outer surface of the bulged valve opening while applying a pressing force, the hot-melt adhesive applied to the valve opening and dried is activated and the seal is completely sealed. will be done.

〔Example〕

Hereinafter, one embodiment of the device according to this invention will be described in detail with reference to the drawings.

FIG. 1 is an external side view showing the main parts of the apparatus of this embodiment. However, the front side panels are shown removed. This device includes a lower belt conveyor 10 that conveys a packaging bag 1 filled with powder and granules, and that temporarily stops when the valve opening of the bag 1 is sealed and also serves as a holding stand. an upper belt conveyor 20 which is arranged in parallel and facing each other and which runs at the same speed as the lower belt conveyor 10 while pressing the conveyed packaging bag 1 with an appropriate pressing force, and which runs and stops at the same time; Contacting the outer surface of the valve opening of the bag 1, both belt conveyors 1
The main part is constituted by a hot plate 40 that heats the valve port part during a short stop of 0.0 and 2.0 °C.

The lower belt conveyor 10 carries the filled packaging bags 1 between a driving pulley 11 and a driven pulley 12, which are rotatably supported on a pair of opposing side plates 2.
For example, 60% of the width dimension as shown in Figure 3.
An endless belt 13 having a width B of about 100 mm is stretched around the belt, and on the conveying side of the endless belt 13, in order to support the endless belt 13, a large number of free-rotating receiving rollers 14, which are similarly pivotally supported by the side plate 2, are arranged at equal intervals. , a tension roller 15 is provided on the return side. Note that the width of the endless belt 13 may be the same as or wider than the width of the packaging bag.

Further, 16 is a conveyor belt conveyor provided on the upstream side of this device, and 17 is a conveyor belt conveyor 16.
This is a freely rotating roller for transferring the packaging bag 1 provided between the lower belt conveyor 10 and the lower belt conveyor 10.

In the upper belt conveyor 20, a pair of links 23 and 24 are fixed to support shafts 21 and 22 that are rotatably supported on the side plate 2, respectively, and are rotatably attached to the lower ends of these links 23 and 24, respectively. A pair of auxiliary frames (not shown) are fixed to the supporting shafts 25 and 26, respectively, and a driving pulley 27, a driven pulley 28, a plurality of freely rotating receiving rollers 29, and a tensioner are each pivotally supported by the auxiliary frames. The rollers 30 are connected to the lower conveyor 10.
An endless belt 31 having the same width as the belt width B of the lower belt conveyor 10 is provided between the pulleys 27 and 28.
is being passed over. Operating links 32 and 33 are fixed to the support shafts 21 and 22, and these operating links 32 and 33 are connected to a connecting rod 34.
are connected to each other through. The operating link 32 is connected at its upper end to an operating rod 36 of an air cylinder 35, and is also connected to an end of a support shaft 37 horizontally held on the side plate 2.

Therefore, when compressed air at an appropriate pressure is introduced into the air cylinder 35 and the actuating rod 36 is retracted, the actuating link 32 connected thereto
The operating link 33, which is connected to the support shaft 21 and the operating link 32 via the connecting rod 34, rotates the support shaft 22 by the same angle clockwise, and is fixed to the support shafts 21 and 22, respectively. Since the links 23 and 24 shown in FIG. In this case, since the links 23 and 24 have the same length, they operate as a parallel link mechanism, and the auxiliary frames fixed to the support shafts 25 and 26, respectively, descend while maintaining a horizontal state. It is becoming. For this reason, in the upper belt conveyor 20, if pressurized air is supplied to the air cylinder 35 to draw the actuating rod 36, the belt can be lowered while keeping the lower conveyor belt surface horizontal. On the other hand, when an upward force is applied to the surface of the conveyor belt, it is lifted upward according to the force, and the actuating rod 36 of the air cylinder 35 is pushed out in response to the force.
This means that the pressurized air becomes pressurized by the piston.

As seen in the enlarged external side view of FIG. 4, the hot plate 40 extends from the frame 41 fixed to the inside of the side plate 2 toward the upper part of the bag through which the valve mouth passes. A horizontal shaft 4 rotatably supported in a cantilevered manner extending orthogonally to the direction of travel.
2, and an actuation rod 45 of the air cylinder 44 is connected to the air cylinder 44 via a link 43 fixed to this horizontal shaft 42.
is connected to the pin. and air cylinder 44
A clevis type sensor with a sensor switch 46 is used, and the sensor switch 46 is connected to the frame 41 with a pin at the clevis portion.

Therefore, when supplying pressurized air to the air cylinder 44 and pushing out the actuating rod 45, the link 4
3 is rotated clockwise together with the horizontal shaft 42, so that the actuating rod 45 can rotate, for example, P, Q,
R moves to each position, and accordingly the hot plate 40 moves to P',
It can be rotated to each position of Q' and R'. Although the hot plate 40 occupies the P' position in the standby state, the hot plate 40 is shown in the R' position in FIGS. 1 and 3 for convenience of illustration.

The sensor switch 46 is a reed switch whose mounting position is adjustable along the axis of the cylinder, and the switch is closed when the magnet piece fixed to the piston of the air cylinder 44 comes to the opposing position. It is something. (In this embodiment, the piston position is the position where the actuating rod 45 occupies the Q position.) The sensor 47 is a reflective photo sensor, and is mounted at an appropriate height directly above the center of the delivery roller 17. As shown in FIG. 4, when the light beam from the sensor 47 is reflected by the surface of the transfer roller 17 and the reflected light beam is blocked by the filled packaging bag 1, a signal is emitted from the sensor 47. It is now being output.

Also, the air nozzle 48 shown in FIGS. 1 to 3
When the filled packaging bag 1 conveyed by the lower conveyor 10 and the upper conveyor 20 approaches the holding position of the hot plate 40, powder and granules adhering to the outer surface of the opening and near the entrance thereof are removed. The purpose is to remove this by means of an air jet.

Next, the operation of this device will be explained.

First, when the sensor 47 captures the loaded packaging bag 1, a solenoid valve (not shown) is opened by a signal output from the sensor 47, and the air nozzle 4 is opened.
From 8, pressurized air begins to be injected as a jet flow,
At the same time, another solenoid valve (not shown) is opened,
Pressurized air adjusted to an appropriate pressure is supplied to the air cylinder 44, and the actuating rod 45 is moved from the P position to the R position. Accordingly, the hot plate 40 is rotated from the P' position as described above and stopped at the R' position.

As shown in FIG. 1, the filled packaging bag 1 conveyed by the conveyor belt 16 is conveyed to the right by the lower belt conveyor 10, and is transported between the conveyor surfaces of the lower belt conveyor 10 and the upper belt conveyor 20, respectively. It is pushed into the gap space that is formed. In this case, the conveying surface of the lower belt conveyor 10 is fixed in the vertical direction, but the conveying surface of the upper belt conveyor 20 is controlled by an appropriately adjusted pressure inside the air cylinder 35 in response to the upward force applied thereto. By compressing the pressurized air with a piston, a small amount of air can escape. This means that an appropriate pressing action is applied to the filled packaging bag 1 by the conveying surface of the upper belt conveyor 20. On the other hand, the conveyor belt 1 of both belt conveyors 10 and 20
3 and 31 both have a width of B, and the packaging bag 1
Since it is said to be about 60% of the width of
A hot plate 4 is sandwiched between the conveyors 10 and 20.
The packaging bag 1 being sent to the valve opening 3
When viewed from the side, both sides are slightly bulged due to the movement of the powder inside, as shown in FIG. A jet flow is blown from the air nozzle 48 onto the valve port 3 bulged in this way, and the powder adhering to the outer surface of the valve port 3 is removed.
In addition, due to the negative pressure generated by the air flow flowing along the outer curved surface near the valve port 3, the powder particles adhering to the vicinity of the inlet of the valve port are sucked and discharged, and when heat is transferred by contact with the hot plate 40, This eliminates the problems associated with adhesion of the hot melt adhesive applied to the inner surface of the valve opening. Furthermore, both conveyors 10, 2
0 transports the filled packaging bag 1 to the right,
As shown on the right side of FIG. 4, it contacts the hot plate 40 held at the R' position described above.

Since the hot plate 40 is previously heated to, for example, about 200° C., heat begins to be transferred from the hot plate 40 to the outer surface of the filled packaging bag 1, particularly the valve opening 3, due to the contact. The packaging bag 1 is further pushed to the right by the belt conveyors 10 and 20 that continue to run, so the heating plate 40 held at the R' position is pushed out by the movement of the packaging bag 1. The counterclockwise torque acting on the horizontal shaft 42 due to the force exerted by Then, while pressing the hot plate 40, it is rotated counterclockwise and moved to the Q' position. This hot plate 40
As the air cylinder 44 rotates from the R' position to the Q' position, the actuating rod 45 of the air cylinder 44 is moved from the R position to the Q position, and the actuating rod 45 correspondingly moves from the R position to the Q position.
When the piston 5 is pushed in, the magnet piece attached to it activates the sensor switch 46. The actuation of the sensor switch 46 causes the drive motors (not shown) of the drive pulleys 11 and 27 of the belt conveyors 10 and 20 to be stopped, respectively. Simultaneously with this stop, a timer (not shown) is activated, and when, for example, one second has elapsed, the drive motor is operated again, and both conveyors 10,
20, the filled packaging bag 1 is discharged from this device and sent to a conveyor 18 connected to the next process.

By the way, during the approximately 1 second pause of both the belt conveyors 10 and 20, the packaging bag 1 is attached with the hot plate 40 in close contact with the outer surface of the valve opening 3. The adhesive applied to the inner surface is sufficiently heated to activate its adhesive properties and to complete the seal.

Further, due to the time limit operation of the timer described above, the solenoid valves connected to the air nozzle 48 and the air cylinder 44 are respectively closed, the jet flow is stopped, the actuating rod 45 is returned to the P position, and the hot plate 40 is is held at the standby position P'. Note that the ambient temperature in which this device is installed is, for example, 35℃.
If the temperature is higher than the above, a cooling plate 50 that is held to operate in the same manner as the hot plate 40 and that utilizes the Joule-Thomson effect of compressed air, for example, may be attached to prevent the belt conveyors 10, 20 from running. In the meantime, the valve opening may be cooled while being pressed from the outside.

[Effect of idea]

As is clear from the above description, in the side valve type packaging bag closure device according to the present invention, in the conventional powder filling device, it is difficult to fill a predetermined amount of powder into the side valve type packaging bag. Then, the seal of the valve opening was completely removed, and the adhesive applied to the filled packaging bag, especially the adhesive that had been applied and dried in advance to the valve opening, was removed during the transport process of the filled packaging bag on the conveyor. The adhesive is activated by pressing a hot plate closely against the outer surface of the valve opening of the side-valve packaging bag made for hot melt for a very short period of time (about 1 second), and then heating it. Since the valve opening can be sealed with adhesive by letting the hot plate escape horizontally with respect to the traveling direction of the bag, it is possible to speed up the sealing of the valve opening and improve the performance of the powder filling device. In this method, only powder and granular materials can be filled to the fullest capacity, and this has greatly contributed to improving the productivity in filling and bagging powder and granular materials.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view of a sealing device for a side-valve type packaging bag showing one embodiment of this invention (however, the front side plate is removed), and Fig. 2 shows the discharge of this device. FIG. 3 is a front view mainly showing the shape of the filled packaging bag seen from the side, FIG. 3 is a plan view showing the main parts of this device, FIG. 4 is an enlarged side view showing the operating state of the hot plate, and FIG. This invention shows a side valve type packaging bag, A is a front view, B is a perspective view after filling, and Figure 6 shows an overhead valve type packaging bag, A is a front view and B is a perspective view after filling. It is a diagram. 1... Side valve type packaging bag, 1'... Overhead valve type packaging bag,
3, 3'...Valve port portion, 10...Lower belt conveyor, 16...Transportation belt conveyor, 20...Upper belt conveyor, 23, 24...Parallel link, 3
2, 33... Link, 34... Connecting rod, 35
...Air cylinder, 40...Hot plate, 42...Horizontal axis, 43...Link, 44...Air cylinder, 4
6...Sensor switch, 47...Sensor, 48...
...Air nozzle.

Claims (1)

[Scope of utility model registration request] A valve opening is formed at the upper front corner of the bag, and powder is filled into a side-valve packaging bag in which hot-melt adhesive is applied and dried to adhere to the inner surface of the valve opening. A lower belt conveyor that conveys finished packaging bags with the valve opening facing forward and upward in the conveying direction; A vertically movable upper belt conveyor moves in the same direction and at the same speed and presses the top surface of the filled packaging bag with constant pressure so that the side edge does not touch the valve opening, and the upper and lower belt conveyors The filled packaging bag is brought into contact with the outer surface of the valve opening in a pressed state using a horizontal shaft arranged perpendicular to the direction of travel of the bag as a fulcrum at the passing position of the valve opening of the filled packaging bag. A sealing device for a side valve type packaging bag, comprising a heating plate that can be rotated horizontally and detached according to the following.