JPS6012934B2 - bag folding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bag folding and packaging machine, and in particular to a folding device used for folding bags made of fragile materials such as plastics.

The use of bags made of plastic materials has gained wide acceptance and a large commercial market has developed.

The physical differences between fragile bags, such as plastic bags, and paper or textile bags necessitated the development of new machinery and equipment to economically manufacture plastic bags. . Generally, plastic bags can be made of film-forming polymers such as polyethylene, polypropylene, polyvinyl chloride, and the like, and can be multilayered. Compared to their paper or cellulose counterparts, plastic bags have very low body stiffness, are relatively thin, and have significantly lower surface friction properties. Generally, the production of plastic bags starts with plastic film formed into separate bags, and then these bags are folded and packed into boxes.
ultimately purchased by the consumer. In typical production equipment, the plastic bag is formed and then delivered to a receiving area from which the final folding operation proceeds. Each bag is fed flat into the receiving area and slides into the area until sliding of the bag is prevented by a barrier, commonly referred to as a fence. When the bag comes to rest it must be approximately aligned with the fence. This plastic bag will inhibit further movement if it is poorly aligned within the receiving area;
It has been found that this reduces production efficiency.

Poor alignment tends to occur with plastic bags in prior art devices. This is because the leading green part of the bag stopped by the fence has poor body rigidity, so that the leading twill part may become distorted. Another cause of misalignment is that the bag is delivered to the receiving device in a direction such that its leading green is not perpendicular to the direction of delivery. The corrugations formed strengthen the leading green of the bag, thereby ensuring a right-angled orientation when the bag hits the fence. Generally, this misalignment problem can occur when the bag is delivered in a corrugated region when the bag size in the feeding direction is relatively large.

It has been found that even large plastic bags, once folded before being delivered with a corrugated area, can become misaligned due to poor retention of the corrugated area while the bag moves into the receiving area. It is an object of the present invention to overcome this problem and thereby improve production efficiency and economy for bags of fragile materials such as plastics.

It should be understood that the invention is not limited to bags only, but can also be used for sheets of frangible material and the like.

One of the main objects of the invention is to provide a device for use when folding bags made of frangible materials, which device is suitable for discharging successive bags in the direction of feed. a feeding device operable in the feeding direction and having a plurality of corrugated regions having a super-shape in the transverse direction, operable to receive bags from the forward feeding device, and at least a receiving device operable to maintain at least one thousand of the corrugated regions in each of the bags until stopping its movement along the feeding direction; We have a fence installed near the receiving device to prevent this. Another object of the invention is to obtain a device for use in folding bags, the feeding device having a plurality of corrugated areas in each bag and for moving each bag in the feeding direction. It has a set of axles and a plurality of spaced tires mounted on these axles and cooperating with each other.

Another object of the invention is to obtain a device for use in folding bags, the receiving device having “a plurality of upper rods and a plurality of lower rods; cooperate with each other to maintain at least a portion of the corrugated area within each of the bags until at least each of the bags ceases its movement along the feeding direction.

Other objects and advantages of the invention will be set forth in part in the following specification, and in part will be obvious without specific reference to the same.

The same may be realized and accomplished as indicated in the claims. Therefore, ``the present invention has features of a structure, a combination of elements, and an arrangement of parts, which are exemplified by the structure described below, and the gist of their application is specified in the claims. There is.

To better understand the nature and purpose of this invention,
Please refer to the following detailed description of the accompanying drawings.

In carrying out the invention, one embodiment has been selected to be illustrated in the accompanying drawings and to be described in the specification, to which reference is made to FIGS. 1-7.

FIG. 1 shows a complete device for producing folded wrapped bags from rolls of plastic film.

For the embodiment shown, the plastic film 10 in the form of a roll 11 is moved around a roll 12 into a bag making machine 13. The plastic film 10 on the roll is pre-folded in the length direction. This plastic film 10 is produced using an extruder (e.g.
) and then be pre-folded before entering the bag making machine 13. The plastic film 10 may also be fed in other well-known manners, such as from a roll without folded film and pre-folding the film before it enters the bag-making machine 13. Typically, the bag making machine 13 is an Aku Folder folding machine (Model 1) manufactured by FMC Corporation.
Accu-FolderFoldingMachine
) combined with G. T. G.T.Sch
The machine can be a 208 type polyethylene bag making machine manufactured by JEL DOH I Company.

Machine 13 makes bags 14.

The bag 14 is folded in the length direction, and the folded side is
Become a leading green. Folds, however, are usually not clear due to the characteristics of the film. The bag 14 moves through a feeding device, such as a corrugating roller 5, and into a receiving device 16. This receiving device 16 is for carrying out the final folding and wrapping operations of the bag 14. The bag 14 rests in the receiving device 16 in a substantially flat state and is then folded and removed from below like the bag 17 by the nip roller 18 in combination with the belt 19.
Equipment 20' is used for additional processing and packaging steps. Second
As can be seen from the figure and FIG. 3, the bag is moved by the moving device 22 to the corrugating roller 15, and one upper rod 23 and two lower rods 24 arranged in a staggered manner form a set. , a plurality of sets can be inserted into a plurality of upper rods 23 and a plurality of lower rods 24 arranged at intervals. The adjusting device 21 is capable of vertically moving the lots to obtain a predetermined spacing at a predetermined height. Each rod position within each group is adjustable. Each of the corrugating rollers 15 has a drive shaft 25 and tires 26. Generally, each tire 26 is a ring of resilient material, with each tire 26
is frictionally engaged with the shaft 25.

This material can be a plastic such as polyurethane or a rubber-like material. The tires 26 are clustered together and the moving device 22 is moved when the corrugating roller is driven.
It acts to grip and remove the bag from the bag. Each group of tires 26 is
A corrugated area is formed on the bag passing between the corrugating rollers 15. As used herein, a waveform region is a physical change as shown in FIG. 6, where the illustration shows four waveform regions.

The corrugated areas give the bag good lateral stiffness so that when its leading green contacts the barrier, the bag resists deformation that would cause misalignment.

These corrugated areas improve not only the stiffness of the leading green but also the overall stiffness of the bag so that misalignment of the bag is corrected when the bag hits the fence. As can be seen from FIGS. 2 and 3, the present invention does not apply to devices that require seeding of bags within a receiving area.

The interaction between the bag 27 and the tire 26 is shown in FIGS.
It can be seen from the diagram.

The relationship of the rods 23, 24 to the tire 26 can be seen from FIG. Typically, the end of the upper rod 23 near the corrugating roller 15 is positioned to extend approximately to the lower end of the tire 26 on the upper rod 25.

Similarly, the end of the lower rod 24 close to the corrugating roller 5 is located close to the upper end of the tire 26 on the lower rod 25. In Figure 6, the plastic bag is attached to the rods 23 and 24.
This shows the state after the vehicle has slipped between the two and stopped at a barrier such as the fence 28.

Fence 28 is a linear array of fixed vertical cylinders as shown in FIGS. 2 and 3. The bag 27 is moved towards the pinch roller 18 by the air knife device 30'.

Typically, an air knife is a linear array of air nozzles that provides a jet of air to move the plastic bag toward the pinch rollers. A representative air knife is described in Coast US Pat. No. 3,918,698. For bag removal devices using overhead air knives and pinch rollers, it is possible to define a corrugation in the bag that corresponds to the space between the pinch rollers and extends generally toward the pinch rollers. preferable.

As shown in FIG. 6, it is preferred to have a rod 31 above the bag 27 which acts to deform the bag 27 towards the rollers 18. FIG. 7 shows the plastic bag 27 being engaged by the nip rollers 18 and being drawn down between the belts 19.

Obvious variations will be readily apparent to those skilled in the art, and the invention is not limited to the details of the construction described above.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the present invention related to a bag manufacturing machine and a folding packaging device, FIG. 2 is a partially removed plan view of the present invention, and FIG. 3 is a partially removed plan view of the present invention. Partial side view, FIG. 4 is a cross-sectional view of the invention taken along section line 4--4 of FIG. 2, and FIG. 5 is a cross-sectional view of the invention taken along section line 5--5 of FIG. FIG. 6 is a cross-sectional view similar to FIG. 4, with the added portion removed and the plastic bag being corrugated for further folding and packaging. FIG. 7 is a cross-sectional view similar to FIG. 6, but showing the plastic bag in a later state as it is being moved. 10...Plastic film, 13...
...Bag manufacturing machine, 14...Bag, 15...Corrugating roller, 16...Bag receiving device, 17...
...Folded bag, 18...Nitsupora, 19
... Belt, 20 ... Folding and packaging device,
21... Guide rod adjustment device, 22... Moving device, 23... Upper rod, 24... Lower rod, 26... Tire, 27... bag, 28
...Fence, 30...air-knife device. F! G. l FIG. 2 FIG. 3 FIG. 4 FIG. 5 FIG. 6 FIG. 7

Claims (1)

Claims: 1. A bag folding device for forming a plurality of aligned bags from frangible material, each folded only once, with a receiving device for the final folding and wrapping operation. a feeding device that feeds a plurality of bags;
A feeding device interlocked with the feeding device, wherein the folded edge of each bag is a leading edge, and each feeding bag has a plurality of grooves formed in the feeding direction and corrugations along the transverse direction. a feeding device for discharging successive bags in free movement that are folded only once with a plurality of corrugated regions; a receiving device operable to maintain a portion of the corrugated region within each of the bags; and a receiving device in the vicinity of the receiving device for stopping movement of each of the bags along the feeding direction. A folding device characterized in that it has a fence provided therein. 2. The device according to claim 1, wherein the feeding device includes a set of corrugating rollers. 3. Each of the corrugating rollers has a drive shaft and a plurality of tires mounted in the axial direction of each of the drive shafts,
3. The apparatus of claim 2, wherein the tires are positioned on the drive shaft to cooperate to interact with each bladder to form a corrugated area. 4. The receiving device has a plurality of upper rods and a plurality of lower rods, the rods extending substantially along the feeding direction;
2. The device of claim 1, wherein the device is positioned to retain said corrugated region at least during movement of each bag relative to at least a portion of the corrugated region. 5. The device of claim 4, wherein the receiving device further includes an adjustment device operable to change the vertical position of the plurality of upper rods and the plurality of lower rods. 6. The apparatus of claim 4, wherein the fence is positioned to provide a barrier to movement of each bag, thereby causing each said bag to remain stationary in a predetermined position. 7. Each bag is stationary above a set of nip rollers and an air knife is operative to direct an air stream in a generally straight imaginary line along the bag to move the bag toward the nip rollers. 6. A device according to claim 5, located below the device.