JP6939116B2 - Heavy packaging bag - Google Patents

Description

The present invention relates to a heavy-duty packaging bag for storing powders and granules, and for example, a heavy-duty packaging bag made of kraft paper for storing grains such as rice.

In this type of packaging bag, both ends of kraft paper forming a long strip in the width direction are overlapped and glued, and the long tube formed by this is cut at regular intervals, and one cut end is sealed. It is processed and the other opening is used as an entrance / exit. In particular, a heavy packaging bag for storing grains such as rice and wheat and powders such as cement of several kilograms to 30 kilograms is generally manufactured as having a laminated structure of two or more layers. be. Here, the heavy-duty packaging bag used for rice and wheat is generally a heavy-duty packaging bag having a three-layer structure in terms of strength and rigidity. As the thickness increases, the storage volume required when not in use also increases. Therefore, in consideration of manufacturing cost and storability, a two-layer structure is preferable, but the strength required for a heavy-duty packaging bag must also be satisfied.

The strength required for heavy-duty packaging bags is the strength against impact, considering the load applied during distribution. The present inventor has heavy packaging bags each plurality bags prepared having a two-layer structure of kraft paper having a basis weight of ^{75g / m 2, 75g / m} 2 and 84 g / m ² filled with 30kg of unpolished rice, 1 as horizontal. When a drop bag breaking test conforming to JIS Z 0217, in which the bag was dropped 10 times from a height of 2 m, was carried out, it was confirmed that no tear occurred in any of the heavy packaging bags.

On the other hand, in the heavy packaging bag, as described in Patent Document 1, a mouth strap is attached along the filling port of the paper bag with both ends extending from both sides of the paper bag, and the filling port portion (mouth portion) is attached. It is common to fold the bag several times with a small width and tie both ends of the cord to wrap it. Therefore, it is strongly required that the heavy-duty packaging bag has a strength that does not cause tearing of the mouth portion including the attachment portion of the mouth cord, particularly during the work associated with the filling of the powder or granular material. The work that accompanies filling is the work of grasping the mouth of the heavy packaging bag with both hands, lifting it, and shaking it up and down in order to smooth out the bias of the filled powder and granules. This is because the load is applied. That is, in order to attach the mouth cord to a general heavy-duty packaging bag, the outermost one layer near the mouth of the bag is folded back and attached so as to cover the mouth cord. Then, in the conventional heavy-duty packaging bag with a mouth cord, a portion where the amount of paper constituting the mouth portion of the bag is reduced by one layer is formed, and the strength of that portion is lowered. For this reason, there arises a problem that the strength of the portion gripped by both hands is insufficient during the work of leveling the bias of the filling material, and the mouth portion is likely to be torn. In particular, as described above, the heavy-duty packaging bag having a two-layer structure of kraft paper is preferable in terms of manufacturing cost and storability, and although it has sufficient strength in the drop bag breaking test, the strength of the mouth is high. The decline was a big problem.

JP-A-2007-30907

Makiko Kawachi, 2012: National Institute of Advanced Industrial Science and Technology (AIST) Dimensional data of Japanese hands. https://www.dh.aist.go.jp/database/hand/index.html

Therefore, an object of the present invention is to provide a structure in which the strength of the mouth portion including the attachment portion of the mouth cord is maintained in a heavy packaging bag having a mouth cord, which is excellent in manufacturing cost and storability.

Therefore, the present invention has at least two inner and outer layers of tubes, has a first surface portion and a second surface portion on which they overlap, a sealing portion is formed on one end side, and a filling port is provided on the other end side. A formed heavy packaging bag, which is arranged along the filling port on the first surface portion and is attached so that both ends extend from both side edges of the heavy packaging bag connecting the sealing portion and the filling port. It is provided with a string and a folded portion provided at the filling port portion, the first surface portion is folded back at least at the outer layer portion to cover and hold the mouth cord, and the folded portion is parallel to the filling port. It is characterized by having a length equal to or less than the length of the filling port in the direction.

According to the present invention, when gripping the vicinity of both side edges of the filling port during the work performed accompanying the filling of the powder or granular material, the operator can grip both end portions of the folded-back portion together with the mouth string. The attachment part of the is less likely to be torn.

It is a three-dimensional projection drawing which shows the appearance in the use state of one Embodiment which applied the heavy packaging bag by this invention to a rice (brown rice) bag. It is a three-dimensional projection drawing which looked at the appearance of the rice bag in a state where the folded-back part was not formed according to this invention, and was seen from the filling mouth side. (A) and (b) are plan views showing the vicinity of the filling port of the rice bag in which the folded-back portion according to the first and second embodiments of the present invention is formed in an enlarged manner, respectively. 3 is a schematic perspective view showing a cross section taken along the line IV-IV of FIGS. 3A and 3B. It is a top view which enlarges and shows the vicinity of the filling port of the rice bag which formed the folded-back part which concerns on another Embodiment of this invention. It is a schematic perspective view which shows the cross section along the VI-VI line of FIG. It is explanatory drawing explaining the work performed after filling of the powder or granular material.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the embodiments described in detail below, and can be appropriately modified or modified without departing from the gist of the present invention described in the claims. Further, in the following embodiment, brown rice is used as a filling material, and a rice bag suitable for filling 30 kg thereof is illustrated, but the present invention can be widely applied to the storage of powder or granular material. In addition, the dimensions of the heavy packaging bag can be appropriately determined according to the weight of the powder or granular material to be filled.

(Structure of heavy packaging bag)
With reference to FIG. 1, an embodiment applied to a rice bag filled with 30 kg of rice (brown rice) is shown. The rice bag 10 according to the present embodiment adopts a pleated, single-bottomed tube structure having a sealing portion 11 on one end side and a filling port 12 on the other end side. Therefore, by adopting the one-bottom beam structure, when rice is filled in the rice bag 10, stable independence can be ensured as shown in FIG.

FIG. 2 shows the state of the rice bag 10 before the folded portion is formed (FIG. 2 shows the rice bag 10 with the filling port 12 slightly open, which makes the two-layer structure easy to understand. Because). As shown in FIG. 2, the rice bag 10 has a two-layer structure composed of an outer tube 13 and an inner tube 14, and is abbreviated jointly with both side edges 10S of the rice bag 10 connecting the sealing portion 11 and the filling port 12 as a boundary. A pair of (first and second) surface portions 10A and 10B having a rectangular shape are superimposed. That is, the first and second surface portions 10A and 10B include an outer layer formed by the outer tube 13 and an inner layer formed by the inner tube 14. Therefore, the manufacturing cost can be reduced as compared with the conventional heavy-duty packaging bag having a three-layer structure, and the bulkiness can be reduced to improve the storability when not in use or when not in use. The basic structure of the rice bag 10 having a two-layer structure is manufactured in a well-known form, and by performing interlayer adhesion at appropriate sites, a stable two-layer structure without mutual deviation can be obtained.

Here, among the outer layers formed by the outer tube 13, the portions belonging to the surface portions 10A and 10B are referred to by reference numerals 13A and 13B, respectively. Further, among the inner layers formed by the inner tube 14, the portions belonging to the surface portions 10A and 10B are referred to by reference numerals 14A and 14B, respectively. On the surface of the outer layer portion 13A, that is, the surface 10F of the rice bag 10, a mouth cord 16 extending beyond the side edges 10S is attached by adhesion in the vicinity of and in parallel with the filling mouth 12. The front surface 10F of the rice bag on which the cord 16 is arranged may be simply referred to as the front surface 10F, and the surface of the outer layer portion 13B on the opposite side thereof may be referred to as the back surface. The back surface may be, for example, the surface on which the inspection certificate for rice is printed.

As for the method of forming the boat-shaped bottom of the sealing portion 11, any conventionally well-known method can be appropriately adopted. On the other hand, the folded-back portion is formed so as to cover the mouth cord 16 in the vicinity of the filling port 12. Then, by gluing the region where the folded portion overlaps with the surface 10F, the mouth cord 16 is firmly adhered and held by the surface 10F.

(Various embodiments of the folded portion)
In the present invention, basically, by folding back a folded portion having a length of the filling port (width between both side edges 10S) w0 or less in a direction parallel to the filling port 12, at least the outer layer portion on the front side is folded back. It is characterized by forming. In each of the embodiments described below, the rice bag 10 has a symmetrical shape centered on the longitudinal axis C orthogonal to the filling port 10 at the center between the side edges 10S, and has a symbol P1 to P4 in FIG. Indicates the formation position of the slit for forming the folded portion. Here, the position P1 is a position corresponding to both side edges 10S, the position P2 is a position near both side edges, and the positions P3 and P4 are positions separated from both side edges 10S by a predetermined distance.

3 (a) and 3 (b) are enlarged plan views showing the vicinity of the filling port of the rice bag in which the folded-back portion according to the first and second embodiments is formed, respectively, and FIG. 4 is an IV in those views. It is a schematic perspective view which shows the cross section along the −IV line.

In the first embodiment, the outer tube 13 and the inner tube 14 are incised to form a slit from the position P1 to the position closest to the mouth cord 16 in accordance with both side edges, and both layer portions 13A and 14A are formed on both sides. The folded portion 17 is formed by integrally folding the two. Further, in the second embodiment, both the outer layer portion 13A and the inner layer portion 14A are incised parallel to both side edges from the position P2 to the position closest to the mouth cord 16 to form a slit, and both layer portions 13A, The folded-back portion 17 is formed by integrally folding the 14A in a valley. Then, by gluing the region where the folded portion overlaps the surface 10F, the mouth cord 16 is adhered and held by the folded portion having a two-layer structure. In these embodiments, interlayer adhesion between the outer layer portion 13A and the inner layer portion 14A in the folded-back portion 17 can be appropriately performed, but it is ensured that the mouth cord 16 is adhered to the entire surface. It is preferable to hold it.

In the first and second embodiments, the mouth cord 16 is adhered and held by the folded-back portion in which the inner and outer two-layer tubes are overlapped with each other. Therefore, the strength does not decrease due to the decrease in the number of tube layers in the portion that grips the bag during the filling operation.

In the first embodiment, the slits are provided so as to coincide with the both side edges of the inner and outer layer portions, but the side edges are creases due to the folding of the tube, and the strength against the progress of the cut is likely to decrease. It is a part. Therefore, it can be said that the second embodiment in which the slit is formed at a position deviated inward from both side edges is a more preferable form from the viewpoint of more reliably preventing the bag from tearing.

FIG. 5 is an enlarged plan view showing the vicinity of the filling port of the rice bag in which the folded portion is formed according to another embodiment, and FIG. 6 is a schematic perspective view showing a cross section along the IV-IV line in those views. be.

In this embodiment, a slit is formed only in the outer layer portion 13A at a position (position P3 or P4 in FIG. 2) separated from both side edges by a predetermined distance d1 from the filling port 12 side to the position closest to the mouth cord 16. Then, the folded-back portion 17 is formed by valley-folding the outer layer portion 13A. In this embodiment, the mouth cord 16 is adhered and held by the folded-back portion 17 having a one-layer structure having only the outer layer portion 13A. Is not done.

In this embodiment, if the slit is formed at the position P3 in FIG. 2, the folded-back portion is formed at a position relatively close to the both side edges 10S, and if the slit is formed at the position P4, the folded portion is formed at a position relatively far from the both side edges 10S. A folded portion is formed. Therefore, the above d1 value should be appropriately selected, and the value of the preferable predetermined distance d1 will be described below.

As will be described later with reference to FIG. 7, during the work performed after filling the rice bag, the operator inserts the first finger (thumb) into the inner inner edge portion of the filling port 12 and slightly faces the surface 10F side from both outer edges of the bag. Grip the rice bag with the 2nd to 5th fingers at the position closer to. Therefore, the folded-back portion must be formed so that tearing is unlikely to occur during such work, and the holding strength of the mouth cord 16 is less likely to be lowered and the attachment portion is less likely to be torn.

Here, according to Non-Patent Document 1, the size of the hand width of Japanese is about 80 mm for men and about 70 mm for women. On the other hand, although it depends on the size of the target rice bag, for example, if the value of the predetermined distance d1 is large, that is, if the size w1 of the folded portion in the direction along the filling port 12 is too small, the mouth string 16 is adhered and held. There is concern about lack of strength. Further, in the present embodiment in which the mouth cord 16 is fixed only in one layer of the outer layer portion 13A, the situation is that the value of the predetermined distance d1 is too small, that is, the slits are formed in the immediate vicinity of both side edges. Depending on the case, there is a concern that the folded-back side end may be torn. That is, there is a case where a force for pulling the mouth cord portion extending from the folded-back portion side end portion in the direction intersecting the surface 10F acts. Therefore, there are an upper limit value and a lower limit value at the predetermined distance d1.

In consideration of the above, the present inventor prepared a rice bag for 30 kg having a width between both side edges of 490 mm in which a folded portion was formed with d1 values of 50 mm and 80 mm. In these rice bags, the operator can grasp the mouth cord 16 together with the mouth cord 16, and the attachment portion of the mouth cord 16 is less likely to be torn. No decrease in the strength of adhesively holding the mouth cord 16 was observed, and no tear was observed at the side end of the folded-back portion even when a force for displacementing the extending mouth cord portion was applied. In this case, the d1 value is not limited to 50 mm or 80 mm, and the rice bag for 30 kg can be set in the range of 50 mm or more and 80 mm or less.

(Work associated with filling)
For the rice bag 10 having the folded portion as in each of the above-described embodiments, the rice is filled by inserting a nozzle such as a fixed quantity supply device into the filling port 12. After filling, work is usually done to smooth out the bias of the rice. In the work, the worker W is in a state where the back surface 10R is directed to his / her own side as shown in FIG. Then, the first finger (thumb) is inserted into the inner inner edge portion of the filling port 12, and the second to fifth fingers are attached at a position slightly closer to the surface 10F side from both outer edges of the bag, and the filling port 12 Grasp the vicinity of both sides of the. At this time, since the worker can grasp both end portions of the folded-back portion 17 together with the mouth cord 16, even if the rice bag 10 is lifted and shaken up and down to smooth the bias of the rice R, etc. The attachment part is less likely to be torn. After the work, the filling mouth portion including the folded-back portion 17 is folded several times toward the surface 10F side with a small width, and both ends of the mouth cord 16 are tied together to obtain the state shown in FIG.

(Verification of the effect of the embodiment)
The present inventor has performed the following verification on the rice bag 10 produced according to the above embodiment.

First, the basis weight of ^{75g / m 2, 78g / m} 2 and 84 g / m ² has a two-layer structure of the kraft paper, a rice bag manufactured according to the above embodiments each of a plurality of bags prepared, either in 30kg also Filled with brown rice. Then, the work of lifting the rice bag 10 and rocking it up and down as described with reference to FIG. 7 was repeated, but in each case, the mouth portion including the attachment portion of the mouth cord was not torn.

From the above, the present inventor can determine the strength of the mouth portion by appropriately determining the formation portion of the folded portion that covers and adheres to the mouth cord as in each of the above-described embodiments even in the case of the rice bag having a two-layer structure. It was found that a two-layered rice bag can be sufficiently put into practical use if it is preserved rice that can be maintained and at least does not require much consideration for distribution.

It should be noted that the higher the basis weight, the stronger the "stiffness" of the kraft base paper, so that the feeling of use is enhanced, but it is predicted that the impact of dropping will put a burden on the mouth where the mouth strap 16 is arranged. The present inventor conducted a drop test of the above-mentioned various rice bags more than 10 times according to JIS Z 0217, ^{and found that the bags having a basis weight of 75 g / m 2} and a basis weight of 78 g / m ² were less likely to be torn. It was confirmed. Thus, a two-layer structure using the inexpensive kraft paper having a basis weight of 75g / m ² ~78g / m ² of unit prices, it is, cost reduction and storage of the manufacturing cost of configuring the rice bag by applying the above-described embodiment It was found that it is preferable to ensure sufficient strength in the mouth portion including the attachment portion of the mouth cord, while improving the above.

(others)
In the above, the heavy packaging body having a two-layer laminated structure of the outer tube and the inner tube has been basically described, but the present invention has a structure of a folded portion that holds the mouth cord and enhances the strength of the mouth part. It has characteristics and does not exclude its application to heavy-duty packaging bags having a three-layer structure or more. Further, a laminated structure of papers having different basis weights may be adopted. Further, the paper constituting the tube is not limited to the kraft paper as described above, and Kurupak paper or the like may be adopted. The point is that an appropriate layer structure may be adopted in consideration of the shape, dimensions, weight, manufacturing process, etc. of the powder or granular material to be stored.

That is, the concept of the present invention should be interpreted based on the scope of claims of the present application, particularly the matters described in claim 1, and any modification or modification included in the concept of the present invention is possible. be. That is, the matters described in the above-described embodiment are not for limiting the present invention, and can be arbitrarily changed according to the use, purpose, and the like.

10 Rice bag 10A 1st surface part 10B 2nd surface part 10F Rice bag front surface 10R Rice bag back surface 11 Sealing part 12 Filling port 13 Outer tube 13A, 13B Outer layer part 14 Inner tube 14A, 14B Inner layer part 16 Mouth strap 17 Folded part P1 to P4 Slit formation position

Claims (4)

A heavy-duty packaging bag that has at least two inner and outer layers of tubes, has a first surface portion and a second surface portion that overlap each other, and has a sealing portion formed on one end side and a filling port formed on the other end side. And
A mouth cord arranged on the first surface portion along the filling port and attached so that both ends extend from both side edges of the heavy packaging bag connecting the sealing portion and the filling port.
A folded-back portion provided at the filling port portion, the first surface portion is folded back at least at the outer layer portion, and the folded-back portion is provided to cover and adhere to the mouth cord.
With
The folded-back portion has a length equal to or less than the length of the filling port in a direction parallel to the filling port, and the inner and outer two layers are incised from the filling port to the position closest to the mouth cord. the slits, Ri Ah in portions folded back inner layer portion of the with the outer layer portion first surface portion,
The interlayer adhesion between the outer layer portion and the inner layer portion in the folded portion is entirely adhered so as to hold the mouth cord.
The slits, heavy-duty packaging bag, characterized in der Rukoto that incision said inner and outer two-layer coincides with the side edges. A heavy-duty packaging bag that has at least two inner and outer layers of tubes, has a first surface portion and a second surface portion that overlap each other, and has a sealing portion formed on one end side and a filling port formed on the other end side. And
A mouth cord arranged on the first surface portion along the filling port and attached so that both ends extend from both side edges of the heavy packaging bag connecting the sealing portion and the filling port.
A folded-back portion provided at the filling port portion, the first surface portion is folded back at least at the outer layer portion, and the folded-back portion is provided to cover and adhere to the mouth cord.
With
The folded-back portion has a length equal to or less than the length of the filling port in a direction parallel to the filling port, and the inner and outer two layers are incised from the filling port to the position closest to the mouth cord. It is a portion in which the inner layer portion of the first surface portion is folded back together with the outer layer portion by the slit.
The interlayer adhesion between the outer layer portion and the inner layer portion in the folded portion is entirely adhered so as to hold the mouth cord.
The slit from the filling opening to the nearest portion of the port string state, and are not dissected the inner layer portion of the outer layer portion and said first surface portion at a position spaced apart from the side edges by a predetermined distance ,
It has the form of a rice bag for containing rice, heavy-duty packaging bag wherein the predetermined distance is you characterized that you have been set in the range of 50mm or 80mm or less. A heavy-duty packaging bag that has at least two inner and outer layers of tubes, has a first surface portion and a second surface portion that overlap each other, and has a sealing portion formed on one end side and a filling port formed on the other end side. And
A mouth cord arranged on the first surface portion along the filling port and attached so that both ends extend from both side edges of the heavy packaging bag connecting the sealing portion and the filling port.
A folded-back portion provided at the filling port portion, the first surface portion is folded back at least at the outer layer portion, and the folded-back portion is provided to cover and adhere to the mouth cord.
With
The folded portion has a length equal to or less than the length of the filling port in a direction parallel to the filling port.
The folded-back portion is a portion in which only the outer layer portion is folded back by a slit in which the outer layer portion is incised at a position separated from both side edges by a predetermined distance from the filling port to the nearest portion of the mouth cord. ,
A heavy-duty packaging bag having the form of a rice bag for storing rice, wherein the predetermined distance is set in a range of 50 mm or more and 80 mm or less. The heavy-duty packaging bag according to claim 3 , wherein the form of the rice bag is a form of a rice bag for storing 30 kg of rice.

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