JPH0339398Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to bags for automatic packaging machines.

[Conventional technology]

Bags consisting of an outer bag made of paper and an inner bag made of synthetic resin are used as bags for packaging powder and granular materials.
When packaging with an automatic packaging machine, the inner bag and outer bag are at least The end on the filling side is glued and formed integrally, and the inner bag and outer bag are usually approximately the same size, although the inner bag may have a tag of several centimeters in some cases. It is true.

[Problems to be solved]

When such a bag for an automatic packaging machine is filled with powder or granular material, the following inconveniences occur when the bag is opened or when it is put into another container.

When bags filled with powder and granules are stacked on a pallet, etc., the inside of the bag is compressed and powder and granules are present in every corner of the bag, and when the bag is opened, the powder and granules are Easy to spill.

When moving an opened bag, or when transferring powder to another container such as a storage tank or hopper, especially a container with a narrow opening, it is easy to spill the powder to the outside.

Since the inner bag and outer bag are glued together at the filling end, when storing some of the powder after using it,
Since it is not possible to tie only the inner bag,
Storage of hygroscopic or volatile powders and granules is inconvenient.

It is difficult to completely discharge the powder and granules, and there is some residual material stuck inside the inner bag, so if you stack empty bags after emptying, a small amount of residual material may fall out. Particularly, in the case of harmful powder or granules, it becomes an environmental problem.

(Normally, it is best to fold back the inner bag at the opened part, but since the outer bag and inner bag are glued together, it is not possible to fold back only the inner bag.) [Means for solving the problem] This invention In a bag for automatic packaging machines consisting of an outer bag and an inner bag, the powder and granules are removed when the bag is opened, when the bag is moved after opening, when the powder and granules are discharged, during storage, and when the empty bag is stored after use. This purpose is to provide a bag with a new structure that prevents spillage and allows only the inner bag to be tied. An automatic bag with at least two layers, one end in the axial direction serving as a filling end for filling the bag with contents, and the other end serving as an opening end for discharging the contents inside the bag. A bag for a packaging machine, in which the inside of the outer bag and the outside of the inner bag are glued together at each end on the filling side, and are longer than the outer bag on the opening side. The extended portion of the inner bag is folded back and placed inside the outer bag, and the end of the extended portion is located outward from the folded portion and is sewn integrally with the end of the outer bag. shall be.

Hereinafter, the present invention will be explained in detail with reference to the accompanying drawings. Fig. 1 is a perspective view illustrating an example of the bag of the present invention, and Fig. 2 shows the state when the bottom of the bag shown in Fig. 1 is opened. 1 is a perspective view showing a paper outer bag;
2 is an inner bag made of synthetic resin, 2a is an extension part, 3 is a filling side end, and 4 is an unsealing side end.

The paper outer bag 1 may normally be a single-layer bag, but may be a multi-layer bag of about 2 to 5 layers depending on the case. The paper quality of the outer bag 2 is not particularly limited, but is usually kraft paper. On the other hand, the material of the synthetic resin inner bag 2 is usually made of thermoplastic synthetic resin such as polyethylene, polypropylene, polyvinyl chloride, etc., or may be a laminate of two or more resins. The inner bag 2 preferably has a larger axial dimension than the outer bag, and is large enough to be appropriately inserted inside the outer bag 1.

The above-mentioned outer bag 1 and inner bag 2 are integrated with each other by bonding the inside of the outer bag 1 and the outside of the inner bag 2 at the filling side end 3 for supplying powder and granular material.
In short, as a bag for use in an automatic packaging machine, if the filling side end is not integrated, the bag cannot be automatically opened from the outside of the bag by the suction force of a suction cup or the like. The bonding method at this time is usually a method using an adhesive or a method of fusing the outside of the inner bag 2, and the bonded portion is located along the filling side end 3.

On the other hand, at the opening side end 4 opposite to the filling side end 3, as shown in FIG. It is stored. The length of the extension part 2a is usually about 20 to 50% of the length of the inner bag 2. The ends of the extension portion 2a are usually sealed by fusion. The folding is performed by folding the extension part 2a once toward the filling side end, and then folding the folded extension part 2a halfway again towards the opening side end. is located outward from the folded portion, that is, the bending point of the folded portion, that is, toward the unsealing side end. At the unsealing end, the end of the extension 2a is sewn together with the end of the outer bag 1, either directly or through a band-like cover. Of course, the suturing must be performed further outward than the fused portion forming the bottom of the inner bag 2. In this way, when the end of the outer bag 1 and the end of the folded inner bag 2 are sewn together, the bag can be removed by pulling up the end of the bag along the seam when opening the bag. When the body is opened, as the outer bag 1 is opened, a part of the folded extension part 2a is pulled up to the top, making it easy to use, and the powder and granules in the inner bag 2 can be immediately discharged. It is preferable.

When the bag of the present invention is actually used, an automatic packaging machine opens the filling side part 3 which is the filling port for powder and granules, and after filling a predetermined amount of powder and granules, the end of the opening is opened. The parts are sealed, for example, by heat sealing. However, although the inner bag 2 is sealed by heat sealing or the like, the outer bag 1 cannot be completely sealed, so it is preferable that the outside of the bag 1 be sewn directly or via a band-like cover in accordance with a conventional method. Also,
In some cases, after heat sealing, the outer end of the sealed portion may be cut and then sutured.

In the present invention, when filling powder or granular material, since there is a double fold of the extension part 2a at the bottom of the inner bag 2,
The powder is filled only up to the first folded position of the inner bag 2. During subsequent transportation, storage, etc., a small amount of powder or granules may cross the first folded part and extend to the extension part 2a.
Even if it moves, it does not go beyond the second folded part, so the part beyond the second folded part of the extension part 2a does not come into contact with the powder or granular material at all.

On the other hand, when discharging the powder filled in the bag of the present invention, it is necessary to open the bag from the opening side end 4 in the direction opposite to the filling port; When the inner bag 2 is cut, the inner bag 2 appears, but this inner bag 2 has an extended portion 2a that is not in contact with the powder or granules.
Then, the end of the elongated portion 2a is cut and the powder inside is discharged.

In this way, in the bag of the present invention, the powder filling port (filling side end 3) and the discharge port (unsealing tip 4) are in opposite directions, so that the powder or granular material can be placed on the outer surface of the outer bag 1, for example. When printing product names, trademark names, company names, etc., it is preferable to print in advance so that the opening tip 4 faces upward.

FIG. 3 is a longitudinal sectional end view illustrating the bag of the present invention shown in FIG. 1. In the figure, 1 is a paper outer bag;
2 is a synthetic resin inner bag, 5 is an adhesive between the inner bag and outer bag at the end on the filling side, 6 is a heat-sealed part of the inner bag at the end on the unsealing side, 7 is a band-shaped cover (crepe paper), and 8 is a Sewing thread is shown for final closure of the unsealed end.

After filling the powder from above in Figure 3, pull the outer bag together, cover it with a belt-like cover if necessary, and then thread the sewing thread through the adhesive part of the inner bag and outer bag. This completes filling and bagging.

FIGS. 4(1) to 4(4) are longitudinal cross-sectional end views illustratively showing the state when the bag of the present invention filled with powder 9 is opened.

(1) shows a state filled with powder or granules.

This is done by filling the bag shown in Figure 3 with powder from above, covering the filling side end with a band-shaped cover, and then opening the inner bag.
The sewing thread is passed through the adhesive part of the outer bag as the center, and the bag is turned upside down. (In the figure, the clearance between the inner bag and outer bag, the clearance between the outer bag and the strip cover, the adhesive, the heat seal part, the sewing thread, etc. are greatly enlarged to make it easier to understand conceptually.) (2 ) indicates the state in which the opening side end is opened and the outer bag is expanded.

(3) shows the state in which the folded and extended portion of the inner bag is pulled up from the opened outer bag.

(4) shows a state in which the heat-sealed portion of the inner bag is cut and removed, and the powder filled in the inner bag is released.

[Effect of idea]

According to the present invention, when the extension part 2a of the inner bag is folded back and the opening side end 4 (in the opposite direction to the powder filling side end) stored in the outer bag 1 is opened, the extension part 2a of the inner bag is folded back. Since the part is not in contact with the powder or granule at all, it is possible to prevent the powder from spilling when opening the package, and
If the extension part 2a is pulled out, the powder will not spill out when carrying the bag. Furthermore, when transferring the powder or granular material to another container, pull out the extension part 2.
A serves as a chute, which not only allows powder to be smoothly introduced even into a narrow socket, but also allows easy adjustment of the input speed and discharge amount. Moreover, since only the inner bag 2 of the bag after the powder has been discharged can be tied or folded in, there is no possibility of the powder remaining inside the bag falling out.

[Brief explanation of drawings]

Fig. 1 is a perspective view illustrating an example of the bag of the present invention, Fig. 2 is a perspective view showing the state when the bottom of the bag shown in Fig. 1 is opened, and 1 in the figure is a paper outer bag. ,2
2 shows an inner bag made of synthetic resin, 2a shows an extension part, 3 shows an end on the filling side, and 4 shows an end on the unsealing side. FIG. 3 is a longitudinal sectional end view illustrating the bag of the present invention shown in FIG. 1. FIG. 4 is a longitudinal sectional end view illustrating a state in which the bag of the present invention filled with powder is opened.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) Consisting of at least two layers: an outer bag made of paper and an inner bag made of synthetic resin, which has a larger axial dimension than the outer bag, and one end in the axial direction is located within the bag. A bag for automatic packaging machines, in which the filling end is used to fill the bag, and the other end is the unsealing end from which the contents of the bag are discharged. The inner bag and the outer bag are attached at each end to form a single body, and at the opening end, the extended part of the inner bag, which is longer than the outer bag, is folded back and placed inside the outer bag. A bag for an automatic packaging machine, characterized in that the end of the extension part is located outward from the folded part and is sewn integrally with the end of the outer bag. (2) Claim 1 of the utility model registration claim characterized in that, at the opening side end, the end of the outer bag and the end of the folded inner bag are sewn together via a band-like cover. Bags for automatic packaging machines.