JPS6112381Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a powder container with a double bag structure consisting of an inner bag made of synthetic resin film and an outer bag made of woven fabric such as synthetic resin cloth, which particularly requires moisture resistance. The present invention relates to a container suitable for use with powder and granular materials.

In recent years, woven fabrics such as synthetic resin cloth, especially woven fabrics coated or laminated with resin, have been used as containers for transporting various powders and granules, instead of conventional fiber drums, iron drums, or flexible containers made of rubber or polyvinyl chloride. A product made by
Since this woven fabric container is constructed by machine sewing, even if it has a resin laminate layer, it does not have sufficient moisture resistance, and moisture resistance is particularly required for foods such as powdered milk, cement, medicines, etc. It is not practical as a container for powder or granular materials.

In view of the above, the present invention was devised in order to provide a container for powder and granular materials with excellent moisture resistance, which has a double bag structure consisting of an inner bag made of synthetic resin film and an outer bag made of woven fabric. , in which both the inner and outer bags are folded into a gusset shape and formed into a square bottom, the inner bag is constructed by heat-sealing the required closing portions of the top and bottom parts, thereby completely sealing the bag. By inserting this inner bag into an outer bag and sewing the outer bag, a predetermined portion of the heat-sealed closed portion is sewn together with the outer bag, and the inner bag is sewn together with the outer bag. This improves the integrity of the inner bag and outer bag without affecting the moisture resistance of the bag, and facilitates manufacturing.

Next, embodiments of the present invention will be described based on the drawings.
The container according to the present invention includes an inner bag 10 made of a single layer or a multilayer of a synthetic resin film such as polyethylene resin, and a woven cloth such as a so-called synthetic resin cloth woven from monofilament or other synthetic resin fibers such as polypropylene resin. Outer bag 20 and 2
The inner bag 10 and the outer bag 20 have a double bag structure, and both opposing side surfaces 11, 11 and 21, 21 are folded into a gusset shape, and bottom portions 12 and 22 are formed into a square bottom shape. has been done.

The above-mentioned inner bag 10 is provided with an expandable flat cylindrical filling port 13 at the center of its upper end, and the upper end is provided with a gusset inside the cylindrical filling port 13 and on both side surfaces 11, 11, respectively. The folded portions 11a and 11b are heat-sealed and closed, with the exception of the folded portions 11a and 11b.
The top and bottom are closed with a relatively wide width by heat-sealing the strips. Reference numeral 14 indicates the closing portion, and reference numeral 15 indicates the heat sealing portion. In some cases, the entire surface of the closing portion 14 is heat-sealed. Further, as the cylindrical filling port 13, an inner bag 1 is used as shown in the figure.
A flat cylindrical body made of the same synthetic resin film as the main body of No. 0 is inserted so that one end is open to the outside of the bag and the other end is opened to the inside of the bag, and the upper end of the inner bag is removed except for between the front and back. In addition to the structure in which the inner bag 10 is attached at the same time as the heat seal, it is also possible to construct a simple cylindrical body extending upwardly from the upper end of the inner bag 10 and closing it by tying it with a string or the like.

Further, the square bottom portion 12 of the inner bag 10 is formed by heat-sealing the lower end of an extension from one of the front and back sides to the lower edge of the other side, and below both side portions 11 and 11, which are folded into a gusset shape. It is closed by heat-sealing the edges, and the closing portions 16, 16 on both sides of the edges extend slightly laterally. At the center of the bottom portion 12, a discharge port 17 is provided, for example, in the shape of a rectangular tube as shown in the figure. When the discharge port 17 is cylindrical, it is closed by tying it with a string or the like when in use. Of course, other structures of the outlet can also be provided.

Then, when sewing the outer bag 20, the inner bag 10 is formed by heat sealing each closing part as described above.
For example, as shown in FIG. 6, a half-sewn outer bag 20 whose square bottom part 22 is sewn but whose upper end is not sewn is inserted through the opening at the upper end, and in this charged state. The bag is finished by sewing the upper end of the outer bag 20 on both sides 24, 24 excluding the central part corresponding to the cylindrical filling port 13 of the inner bag 10. By sewing with this inner bag loaded,
The heat-sealed closing portions 14 on both sides of the cylindrical filling port 13 at the upper end of the inner bag 10 are sewn together with the upper end portions 24, 24 on both sides of the outer bag 20,
25 indicates the seam. Said both side portions 24, 24
The suturing is performed at the closed part 14 of the inner bag 10 as shown in the figure.
In terms of strength, it is desirable to suture in a zigzag pattern or in multiple threads within this range. Therefore, it is preferable to increase the vertical width of the closing portion 14 of the inner bag 10.

In the embodiments shown in FIGS. 1 to 7, the above-mentioned both side portions 2
4 and 24 are sewn together, and in particular, from the upper ends of both side surfaces 21 and 21 that are folded into a gusset shape as the attachment cloth pieces 27. It is constructed by bending an extension piece into a ring shape. The embodiment shown in FIG. 8 shows a case in which a hanging belt 28 is attached to the outer bag 20 instead of the hanging string in order to be suitable for a large container.
A locking hole 29 is provided within the suturing range of No. 4. The central part between the two side parts 24, 24 is configured to be freely openable and closable by attaching an engaging member 23a such as a sliding fastener to the opening edge, and is formed as an opening part 23 from which the cylindrical filling opening 13 of the inner bag 10 can be pulled out. are doing.

In addition, according to the present invention, the inner bag 10 can be inserted and sewn into the outer bag 20 in which neither the upper end nor the bottom 22 is sewn. In particular, by sewing with this inner bag inserted, the upper end Both side parts 24, 24
In addition to this, the closing portions 16, 16 on both sides of the bottom 12 of the inner bag 10 can also be sewn together with both side edges of the bottom 22 of the outer bag 20. In this case, the inner bag 10 The integrity between the outer bag 20 and the outer bag 20 becomes even better. 30 indicates a seam on the bottom periphery. The bottom 22 of the outer bag 20 is provided with an opening 33 in the center corresponding to the outlet 17 of the inner bag 10, which can be opened and closed by a wing cover 32 through which a tightening string 31 is inserted. At the same time, the discharge port 17 can be pulled out.

As described above, the container of the present invention has a double bag structure consisting of an inner bag 10 and an outer bag 20, and both side surfaces 11, 11 of both the inner and outer bags 10, 20,
21, 21 are folded into a gusset shape and formed into a square bottom.
As shown in the diagram, it swells into a roughly square shape and can of course be used as a square container with good storage and loading efficiency.
In particular, since the inner bag 10 is made of synthetic resin film and is formed by heat-sealing its top and bottom closing parts, it may be exposed to rainwater during transportation or in humid regions or seasons. Even if moisture is present, the inner bag 10 can reliably prevent the intrusion of moisture and moisture, exhibit excellent waterproof and moisture-proof effects, and can protect powders and the like that particularly require moisture-proof properties. Moreover, since the inner bag 10 is sewn integrally with the outer bag 20 at the closing part 14 by heat sealing at least the upper end at the same time as the outer bag 20 is sewn, the inner bag 10 has good integrity with the outer bag 20 and is always attached to the outer bag 20. It is possible to maintain the form suitable for the material without excessive tensile force acting on the material film, and together with the protective effect of the outer bag 20 made of strong woven fabric such as synthetic resin cloth, it can be used without fear of breakage or tearing. .
Furthermore, since the inner bag 10 is sewn to the outer bag 20 at the heat-sealed closed portion as described above,
There is no risk that the moisture-proofing effect of the inner bag 10 will be impaired. Furthermore, in the case of the present invention, the inner bag 10 and the outer bag 20 are sewn together by inserting the completed inner bag 10 into the unsewn outer bag 20 and sewing the inner bag 10 and the outer bag 20. Although the container is folded into a gusset shape and has a square bottom, the container of the present invention having a double bag structure can be manufactured very easily and provided at low cost. Of course, since the container of the present invention is folded into a gusset shape, it can be folded flat and low in volume when not in use, making it easy to handle.

In this way, the present invention is a container for powder and granular materials that has a double structure, consisting of an inner bag made of synthetic resin film and an outer bag made of woven fabric such as synthetic resin cloth. It has excellent practical effects, such as being extremely suitable for use in powder and granular materials that require moisture resistance.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, in which Figure 1 is a partially cutaway front view, Figure 2 is a front view of the inner bag, and Figure 3 is a front view of the inner bag.
The figure is a front view of the outer bag, FIGS. 4 and 5 are enlarged cross-sectional views taken along lines - and - - in FIG. 1, and FIG. 6 is a perspective view showing the state in which the inner bag is inserted into the outer bag.
FIG. 7 is a perspective view showing the state of use filled with powder, etc., and FIG. 8 is a partially cutaway front view showing another embodiment. 10... Inner bag, 11, 11... Both side parts, 12
... Bottom, 13 ... Cylindrical filling port, 14 ... Closing part, 20 ... Outer bag, 21, 21 ... Both side parts, 2
2... Bottom, 24, 24... Both sides, 25, 3
0...stitch.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A container with a double structure consisting of an inner bag made of a synthetic resin film and an outer bag made of a woven fabric such as synthetic resin cloth, in which both the inner and outer bags have gusseted opposite side surfaces. The inner bag has a cylindrical filling opening at the center of its upper end, and the upper end, bottom, and other closing parts are heat-sealed to form a square-bottomed bag. When the inner bag is inserted into the outer bag, the upper end of the outer bag is sewn on both sides, so that the heat-sealed closing portions on both sides of the cylindrical filling opening at the upper end of the inner bag are connected to the outer bag. A container for powder and granular materials characterized by being sewn together. 2. A powder container according to claim 1, wherein the heat-sealed closing portions on both sides of the bottom of the inner bag are sewn together with the outer bag by sewing the bottom of the outer bag.