JPH0563369B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention provides two flat bags made of synthetic resin film.
This relates to a packaging method in which a predetermined number of sheets are folded into an elongated shape from three to eight times, folded into two at once, and inserted into a packaging bag (see FIG. 5).

[Conventional technology]

Traditionally, this type of packaging bag has often been seen on the market as it is used for garbage bags, food packaging bags, etc. Among them, large garbage bags weigh considerably when they are full, so thick film is used. Even when this film is folded, it is difficult to create creases, and this tendency is particularly noticeable in low-density polyethylene (LDEP) films.

Therefore, even if you try to neatly stack a large number of synthetic resin film bags that have been folded in two or four, the folds become especially bulky, making it impossible to stack them up accurately. There was a risk that the top and bottom positions of the stacked bags would shift during folding or when folding them in half at once, making it impossible to wrap them.

Currently, there is a method on the market that uses larger packaging bags to improve this drawback, but not only does it require extra fabric for the packaging bag, but the bag that has been wrapped for a long time is still inside the packaging bag. It has the disadvantage of being disturbed by movement.

It is also conceivable to slow down the transport speed between the stacking station and the packaging station so that the stacked folding bags are not disturbed.
The current situation is that working capacity is declining and working costs are rising significantly.

Therefore, this type of bagging work is still often done manually by workers.

[Problem to be solved]

This invention corrects the bulk when folding the synthetic resin film bags in two to eight times and stacking them in the middle of the above-mentioned packaging method, so that they can be stacked in an orderly manner. can be easily transported and packaged,
To provide a packaging method which minimizes the size of a packaging bag and provides a packaging body in which a group of folded bags stacked after packaging does not move loosely inside the packaging bag.

[Means to solve the problem]

In this invention, synthetic resin film bags that are folded in two to eight folds along folds perpendicular to the feeding direction are sequentially fed out, stacked one after another in an orderly manner up to a predetermined number at a stacking station, and then a group of these stacked bags is stacked. The stacked bags are conveyed to a packaging station, and a second fold, which is perpendicular to the previous folds of the individual bags, is provided in the center of the stacked bags, and the bags are separated from this second fold. A folding bag packaging method in which the folding bags are inserted into a bulk packaging bag, characterized in that the folding bags sequentially sent out to the stacking station are sequentially pressed at the stacking station from above immediately after each folding bag is sent out. do.

〔Example〕

Before explaining the method of this invention, an example of an apparatus used in this method invention will be described.

Reference numeral 10 denotes a bag made of synthetic resin film, which is folded in two to eight times, preferably in four, with a fold 11 perpendicular to the delivery direction. The folded bags 10 are sequentially delivered one bag at a time to a stacking station A by a delivery conveyor 12.

The stacking station A is provided with an endless chain conveyor type bag receiving device 13 that can convey the bags in the same direction as the delivery conveyor 12. Several stoppers 16, which stand up from the conveying surface 15 of the endless chain conveyor 14, are provided at equal intervals at a pitch where exactly one bag 10 can be placed horizontally, and the folded bags 10 sent out by the sending out conveyor 12 are provided. are sequentially stacked along the stopper 16, and each time this number reaches a set number, the endless chain conveyor 14 moves intermittently by one stopper pitch in the conveying direction. It is sufficient that the length of the bag receiving device 13 in the conveyance direction is approximately equal to the pitch.

The operation of the endless chain conveyor 14 is such that, for example, after the motor 17 that drives it starts driving, a sensor detects the next stopper 16 or a corresponding part of the endless chain conveyor 14, and the motor 17 is stopped. There is.

Reference numeral 18 denotes a pressing device provided directly above the bag receiving device 13, which includes a pressing member 20 having a horizontal pressing surface 19, and a pressing member 20 that moves this pressing member 20 from the upper standby position to the conveying surface 15 position of the bag receiving device 13. It consists of a vertical drive device 21 that moves up and down until it comes into pressure contact with the
The vertical drive device 21 uses an air cylinder device in the illustrated example, and the pressing member 20 is driven vertically every time the folded bag 10 is delivered onto the bag receiving device 13 by the delivery conveyor 12. Regardless of the number of folding bags 10, they are lowered by the device 21 and pressed against the bag receiving device 13, and returned to the standby position again.

Note that the present invention is the same even if the vertical drive device 21 is configured purely mechanically instead of using an air cylinder device.

Packaging station B is stacking station A
Stacking station A
An intermediate conveying device 25 is provided between these stations A and B for feeding the stacked bags 10a sent out from the packaging station B to the packaging station B.

This intermediate conveyance device 25 includes a substantially horizontal table 26 that receives the stacked bag group 10a, a presser claw 27 provided on the table 26 that presses the downstream edge of the stacked bag group 10a against the surface of the batch table 26, and a presser claw 27 that opens and closes this claw. It consists of a movable body 29 equipped with a reciprocating drive device 28 to bring the bags together, and a horizontal reciprocating drive device 30 that reciprocates the movable body 29 from the receiving position of the stacked bags 10a sent out from the stacking station A to the packaging station B position. Upstream edge 31 of the table 26 of this intermediate conveyance device 25
is provided with a relief notch 32 through which the stopper 16 of the bag receiving device 13 can pass, and has a comb-like shape.

Further, a slit 33 that is long in the conveying direction is provided in the center of the table 26.
The width of No. 3 is such that the stacked bag group 10a can be passed through when folded in half at once.

The opening/closing reciprocating drive means 28 and the horizontal reciprocating drive device 30 also use air cylinder devices in the illustrated embodiment.

34 is a folding and inserting device provided at the packaging station B, and the folding and inserting device 34 is arranged directly above the slit 33 when the table 26 of the intermediate conveying device 25 is at the packaging station B position. This folding insertion device 34 penetrates the slit 33 of the table 26 from a position higher than the surface of the table 26, and is inserted into the packaging bag 36 which is opened and waiting under the slit 33 by the bag support device 35. The insertion plate 37 rises again.
and a second vertical drive device 38 that moves this insertion plate 37 up and down. This folding and inserting device 34 can be of any known type, except for the structure in which the table is also used as the table 26 of the intermediate conveyance device 25. The above-mentioned second vertical drive device 38 also shows an embodiment using an air cylinder device.

An example of the method of the present invention using the above-mentioned apparatus will be specifically described.

First, the endless chain conveyor 1 of the bag receiving device 13
4 is stopped, the pressing member 20 is in the standby position, the table 26 of the intermediate conveyance device 25 is in the position closest to the bag receiving device 13, the claw 27 is in the open state, and the insertion plate 37 is in the upper standby position. position as the starting position (see solid line in Figure 1).

Then, the folding bag 10 is sent out to the conveyor 1.
2, the folded bags 10 are sequentially fed onto the endless chain conveyor 14 with the fold line 11 as the downstream edge, and stacked along the stopper 16.
Immediately after the first vertical drive device 21 is sent out, the first vertical drive device 21
The folding bag 10 is operated by the pressing member 20.
is pressed to push out and eliminate the space between these bags to the outside, thereby compressing the bulk of the bag groups 10a stacked one after another.

When the set number of folding bags 10 are stacked on the bag receiving device 13, the cycle counter that counts the bags emits an output signal and the motor 17
drives the endless chain conveyor 14 in the conveyance direction, and transfers the stacked bag group 10a on the endless chain conveyor 14 to the table 2 of the intermediate conveyance device 25.
6, the endless chain conveyor 14 stops again after traveling one pitch of the stopper 16, and receives the next folded bag 10 in sequence.

The reciprocating drive device 28 is actuated by a signal indicating that the stacked bag group 10a is sent onto the table 26, and the claw 27 presses the stacked bag group 10a against the surface of the table 26.

Next, by the horizontal reciprocating drive means 30, the movable body 2
9 to the packaging station B position, and transport the table 26 integrated therewith and the stacked bag group 10a thereon to the packaging station B position,
The pawl 27 is opened by the return drive of the reciprocating drive means 28, and at the same time, the folding insertion plate 37 is lowered by the second vertical drive device 38, and the central part of the stacked bag group 10a is inserted into the stacked bag group 10a at the position of the slit 33. The folding insertion plate 37 is returned to the standby position, and is again driven by the horizontal reciprocating drive device 30. Moving body 29 and table 2
6. The claw 27 returns to its original position.

Repeat this operation below. The operating diagram is shown in Fig. 4. These sequence operations are generally performed by electrical or electronic sequencers.

〔effect〕

As described above, in this method invention, immediately after each folded bag 10 is delivered to the bag stacking station A, it is pressed from above against the conveying surface 15 of the bag receiving device 13, so that each bag is The air between the films and between the bags is pushed out and eliminated, their bulk is compressed, and the time until the next bag is stacked is extremely short (usually less than 2 seconds). (usually about 1 second), so even if the film that makes up the bag has a strong restoring force, it will not recover very well in this amount of time, and the bag at the bottom of the bag is often pressed and is almost completely deflated. is removed and pressed by the weight of the upper bag and atmospheric pressure, so the bulk is hardly restored within about 15 to 20 seconds.

Therefore, even when a predetermined number of bags are stacked and transferred to the intermediate conveyance device 25, the contact area between the bags is large, and there is no risk of them sliding against each other and collapsing the stacked state, and the packaging station B
It maintains almost the same state during transportation, and when inserted into the packaging bag 36, it is not bulky and can be easily inserted into the packaging bag 36, there is no need to use a large bag, and the packaging bag 36 There is no movement of each bag group 10a after insertion, and the volume of these packages can be reduced.In addition, in this method, both the folding bags 10 and the stacking bags 10a have short dimensions in the feeding direction, and therefore, it is possible to move from the stacking station to the packaging station B.
The transport dimension can also be shortened.

Therefore, the dimensions of the apparatus for carrying out this method in the conveyance direction can be shortened, and high efficiency can be achieved even without increasing the conveyance speed, resulting in good work efficiency.

[Effects of Examples]

In an embodiment of the method, the intermediate transport device 2
5, stack bag group 10 to packaging station B.
While transporting the bag 10, the folded bag 10 remains horizontally placed on the surface of the table 26, especially the folded edge 11 of each folding bag 10
Since the downstream edge of the barrel is pressed by the claw 27, the bulky stacked bag group 10a is completely prevented from restoring its original shape, and there is no risk of each bag being displaced even by impact during transportation. The time from when the last set number of folded bags 10 is pressed by the pressing member 20 at the stacking station A until the stacked bag group 10a is sent out onto the table 26 is such that each folded bag 10 is sent out in sequence by the conveyor 12. Generally, the time interval is set shorter than the time interval between these stacked bags.
During the delivery of 0a, these bulky restoration dimensions are small and do not pose any practical problem.

In the map, 40 is the machine frame, 41, 42, 43 and 44 are control valves, 45 is a compressor, 46 is an air tank, and 47 is these air system pipes.

[Brief explanation of drawings]

The drawings show things related to the present invention, in which Fig. 1 is a mechanical side view showing one embodiment of an apparatus for carrying out the method invention, and Fig. 2 shows a packaging station portion during insertion of a group of stacked bags. front view, 3rd
The drawings are a plan view of FIG. 1, FIG. 4 is an operational diagram showing the operational relationship of each part of the device, and FIG. 5 is a perspective view showing an outline of the method. Main symbols in the diagram: 10...Folding bag, 11...
Fold line, 10a... stacking bag group, 20... pressing member, A... bag receiving station, B... packaging station.

Claims (1)

[Claims] 1. By a fold in a direction perpendicular to the feeding direction, 2.
After the synthetic resin film bags folded in three to eight folds are sequentially sent out and stacked one after another in a stacking station in an orderly manner up to a predetermined number of bags, the group of stacked bags is conveyed to a packaging station, and the folds of the individual bags are A folding bag packaging method in which a second fold in a right angle direction is provided in the center of the stacking bag group, and the bag group is inserted into the bulk packaging bag from this second fold portion, wherein the stacking station includes: A folding bag packaging method characterized in that the folding bags that are sequentially sent out are sequentially pressed at a stacking station from above immediately after each folding bag is sent out.