JP6848709B2 - Heavy packaging bag - Google Patents

Description

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

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. is there. 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 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-duty packaging bags.

On the other hand, in the heavy packaging bag, as described in Patent Document 1, a mouth cord 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 paper bag several times with a small width and tie both ends of the mouth 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-duty 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

Therefore, an object of the present invention is to provide a structure in which the strength of the mouth portion of 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 is a heavy-duty packaging bag composed of a tube having a first surface portion and a second surface portion to be overlapped with each other, and having a sealing portion on one end side and a filling port on the other end side. In the vicinity of the mouth, a mouth cord placed on the first surface along the filling port and attached so that both ends extend from both side edges of the heavy packaging bag connecting the sealing part and the filling port, and the filling port. The folded portion is provided on the portion and includes a folded portion that covers the mouth cord and holds the adhesive, and the folded portion includes a valley fold area of the first surface portion that covers the mouth cord, a valley fold line of the valley fold area, and both side edges. A first mountain fold area extending from each intersection of the above to the edge on the filling port side of the first surface portion, and a second mountain fold area extending from the intersection to the edge on the filling port side of the second surface portion. And, characterized by having.

The folded-back portion of the present invention is formed in a trapezoidal shape, and the trapezoidal folded-back portion holds the mouth cord at a position deviated inward from both side edges of the heavy-duty packaging bag. Therefore, during the work accompanying the filling of the powder or granular material, the operator can grasp the vicinity of both edges of the filling mouth together with the mouth cord in the vicinity of the mouth portion, so that the attachment portion of the mouth cord is less likely to be torn. .. Further, since the range of adhesion of the folded portion is limited to the hypotenuse of the trapezoid away from both side edges, a sufficient opening area is secured in the mouth portion during work.

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 shown in FIG. 1 from the filling mouth side. It is sectional drawing along the line III-III in FIG. (A) and (b) are plan views showing the front side and the back side of the heavy-duty packaging bag, respectively, in order to explain the formation of the folded-back portion of the filling port portion of the paper bag of FIG. FIG. 3 is a plan view showing a filling port portion in which the folding process described with reference to FIGS. 4A and 4B has been completed. It is explanatory drawing explaining the work performed after filling of the powder or granular material. It is explanatory drawing of the filling mouth part which performed the folding back different from FIG.

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. Further, the dimensions and the like 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 FIGS. 1 and 2, an embodiment applied to a rice bag filled with 30 kg of rice (brown rice) is shown. As shown in these figures, the rice bag 10 according to the present embodiment adopts a foldless single-bottomed tube structure having a sealing portion 11 on one end side and a filling port 12 on the other end side. Therefore, before filling the rice (when not in use or when not in use), a pair of (first and second) surface portions 10A and 10B having a congruent substantially rectangular shape are superimposed. Further, 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.

As shown in FIG. 2 and FIG. 3 which is a cross-sectional view taken along the line III-III thereof, the rice bag 10 has a two-layer structure including an outer tube 13 and an inner tube 14. 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. 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.

On the surface 10F of the first surface portion 10A of the rice bag 10, a cord 16 extending beyond both side edges of the rice bag 10 connecting the sealing portion 11 and the filling port 12 is located near and parallel to the filling port 12. Is attached by adhesive. The surface 10F of the rice bag on which the cord 16 is arranged is hereinafter referred to as a front surface, and the surface on the opposite side thereof may be referred to as a back surface. The back surface may be, for example, the surface on which the inspection certificate for rice is printed.

In the present embodiment, both the outer tube 13 and the inner tube 14 are folded back in a trapezoidal shape 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 17 overlaps the surface 10F, the mouth cord 16 is firmly adhered and held by the surface 10F. The basic structure of the rice bag 10 having a two-layer structure composed of the outer tube 13 and the inner tube 14 is manufactured in a well-known form, and by performing interlayer adhesion at appropriate sites, a stable two-layer structure without mutual deviation is obtained. be able to. Further, although interlayer adhesion between the outer tube 13 and the inner tube 14 located at the folded-back portion 17 can be appropriately performed, it is preferable to adhere the entire surface in order to securely hold the mouth cord 16. ..

(Formation of folded part)
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 17, which is a feature of the present embodiment, can be formed by the following steps.

4 (a) and 4 (b) are plan views showing the front side and the back side of the filling port portion in order to explain the folding step of the filling port portion of the rice bag of FIG. 1, respectively. Further, FIG. 5 is a plan view showing a filling port portion in which the folding process has been completed.

First, as shown in FIG. 5, the folded portion 17 of the present embodiment includes a valley fold region 17C and a first mountain fold region 17A formed on the side of the first surface portion 10A, and a second surface portion 10B. It has a first mountain fold region 17B formed on the side. These regions are formed by bending along the valley fold lines 21 and the mountain fold lines 23 and 33 shown in FIGS. 4 (a) and 4 (b). It should be noted that these folded lines shown by the alternate long and short dash lines in FIGS. 4A and 4B do not mean that they are displayed by printing or the like, but are merely for explaining the bent portion. However, it is effective to crease the first surface portion 10A and the second surface portion 10B prior to the bending step.

(Conditions for folded part)
As shown in FIG. 4A, the valley fold line 21 is in the immediate vicinity of the mouth cord 16 and extends in parallel with the fold line 21. The first mountain fold line 23 extends from the intersection 25 of the valley fold line 21 and the side edges 10S of the rice bag 10 at a first angle α with respect to the valley fold line 21 and extends from the first surface portion 10A. It is made to reach the position 27 on the edge on the filling port 12 side. Further, as shown in FIG. 4B, the second mountain fold line 33 extends from each of the above intersections 25 with a second angle β with respect to the valley fold line 21 and extends from the second surface portion 10B. It is made to reach the position 37 on the edge on the filling port 12 side. Then, by folding back along the valley fold line 21 and the mountain fold lines 23 and 33, the folded-back portion 17 as shown in FIG. 5 is formed.

Here, considering the storability of an unused rice bag, it is preferable that the folded-back portion 17 is folded back into a flat state without slack. Even if the folded portion is not folded back to a flat state in advance, the filling opening portion is folded in a state where the first surface portion 10A is folded flat and adhered so as to cover the mouth cord. The surface portion 10B of the above can also be folded so as to be located on the same plane as the first surface portion 10A. At that time, the folded-back portion 17 is folded back into a flat state without slack, and becomes a right triangle having the first and second angles α and β as the base angles.

The relationship between the first and second angles α and β when the folded-back portion 17 is formed in this way is as follows. The edge 17E of the folded portion formed by performing the mountain folds at the first and second mountain fold lines 23 and 33 is a portion of the rice bag 10 from the corner 10C to the position 27 and a portion from the corner 10C to the position 37. And are formed by. When the folded portion 17 is folded flat without slack, as shown in FIG. 5, the portions form a straight line, that is, the total length of the portions matches the length of the edge 17E. It becomes a state. In other words, the position at the angle 10C is located on the edge 17E after the formation of the folded-back portion 17, but the line drawn from the intersection 25 to the position 10C'is a perpendicular line of the edge 17E. This means that the first angle α and the second angle β have a right angle relationship (α + β = 90 degrees) (By the way, the first angle α and the second angle β are margins. The two base angles of the right-angled triangular portion shown in FIG. 5 with 17E as the base, that is, equal to the angles formed by the two sides sandwiching the position 27 and the position 37, respectively).

Although it is not an essential configuration as described above, if the first surface portion 10A and the second surface portion 10B are crease-processed as shown in FIGS. 4A and 4B, the folding process is performed. Is performed smoothly, and the folded-back portion 17 is surely folded back into a flat state without slack. However, these are not strict, and some tolerances can be tolerated in consideration of the stiffness and expansion and contraction of the paper. Further, in the two folded portions 17A formed on both sides of the filling port 12 of the rice bag 10, the first angles and the second angles do not necessarily have to be equal.

Here, in the folded-back portion 17, the length of the edge of the first surface portion 10 on the side where the cord 16 is fixed is smaller than the length of the edge on the opposite side (second surface portion 10B). Is preferable, but the reason will be explained.

For the rice bag 10 having the folded-back portion 17 as shown in FIGS. 2 and 5, 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, insert the first finger (thumb) inside the filling port 12, attach the second to fifth fingers at a position slightly closer to the surface 10F side from both side edges of the bag, and attach the second to fifth fingers together with the mouth cord 16 on both sides of the filling port 12. Grasp near the edge. Therefore, even if the rice bag 10 is lifted and shaken up and down to smooth the offset of the rice R, the tearing of the attachment portion of the mouth cord is unlikely to occur. 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.

Here, if the length of the edge of the first surface portion 10 is smaller than the length of the edge of the second surface portion 10B (at this time, the angle has a relationship of α <β), FIG. As shown, the edge 17E has an obtuse angle with respect to the front edge of the first surface portion 10A and an acute angle with respect to the front edge of the second surface portion 10B. That is, the front edge of the first surface portion 10A and the front edge of the second surface portion 10B form the upper base and the lower base of the isosceles trapezoid, respectively. Therefore, when the operator inserts his / her thumb with the back surface 10R facing himself / herself, the thumb is positioned in the vicinity of the side edge 10S, so that the filling port can be easily opened and a large opening can be secured.

On the other hand, if the length of the edge of the first surface portion 10A is larger than the length of the edge of the second surface portion 10B (at this time, the angle has a relationship of α> β), the figure. As shown in 7, the edge 17E has an acute angle with respect to the front edge of the first surface portion 10A and an obtuse angle with respect to the front edge of the second surface portion 10B. That is, an inverted isosceles trapezoidal folded portion 17 is formed in which the front edge of the first surface portion 10A and the front edge of the second surface portion 10B are the lower base and the upper base, respectively. Then, when the operator inserts his / her thumb with the back surface 10R facing himself / herself, the thumb is positioned at a portion away from the side edge 10S, so that it becomes difficult to secure a large opening. Therefore, in addition to the fact that the attachment portion of the mouth cord is less likely to be torn, at least the length of the edge of the first surface portion 10 is the end edge of the second surface portion 10B, considering the workability at the time of filling. It is preferably not greater than the length (ie, α> β), especially if the length of the edge of the first surface portion 10 is less than the length of the edge of the second surface portion 10B (ie, α). If it is <β), it can contribute to further improvement of workability.

(Verification of the effect of the embodiment)
The present inventor has a two-layer structure of the kraft paper having a basis weight of ^{75g / m 2, 78g / m} 2 and 84 g / m ^2, respectively paper bag manufactured according to the above embodiment a plurality of bags prepared, to both Filled with 30 kg of brown rice. Then, the work of lifting the rice bag 10 and rocking it up and down as described with reference to FIG. 6 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 maintain the strength of the mouth portion by defining the structure of the attachment portion of the mouth cord as in the above-described embodiment even if the rice bag has a two-layer structure, and at least distributes the rice bag. It was found that a rice bag for preserved rice, which does not require much consideration, can withstand practical use.

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 cord 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 secure sufficient strength and an opening area in the mouth portion including the attachment portion of the mouth cord, while improving the above.

(Other)
The present invention is characterized by a structure of a folded portion that holds a mouth cord and enhances the strength of the mouth portion, and does not exclude application to a heavy-duty packaging bag having a single-layer structure or a three-layer structure or more. .. Further, in the case of a structure having two or more layers, a laminated structure having different basis weights may be adopted. Further, the paper constituting the tube is not limited to the kraft paper as described above, and Krupac paper or the like may be adopted. The point is that an appropriate layer structure may be adopted in consideration of the shape, size, 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. is there. 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 14 Inner tube 16 Mouth cord 17 Folded part 17A, 17B Mountain fold area 17C Valley fold area 21 valley fold line 23, 33 mountain fold line

Claims (4)

A heavy-duty packaging bag composed of a tube having a first surface portion and a second surface portion to be overlapped with each other, and having a sealing portion on one end side and a filling port on the other end side.
In the vicinity of the filling port, it is arranged on the first surface portion along the filling port, 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. With a mouth strap,
A folded-back portion provided at the filling port portion that covers and adheres to the mouth string, and a folded-back portion.
With
The folded part is
The valley fold area of the first surface portion that covers the mouth strap, and
A first mountain fold region extending from the intersection of the valley fold line of the valley fold region and the both side edges to the edge of the first surface portion on the filling port side,
A second mountain fold region extending from the intersection to the edge of the second surface portion on the filling port side,
Have a,
The cord is covered with a trapezoidal valley fold region surrounded by the valley fold line, the edge of the first surface portion on the filling port side, and the first mountain fold region on both side edges. heavy-duty packaging bag and said that you have been adhered held. The folded portion is folded flat, and in the folded state, the first mountain fold line formed when the first mountain fold region is folded from the first surface portion , and the second surface portion. the second mountain fold line formed when bending the second mountain folding area from the from each of the intersection points on the two side edges, to the valley fold lines connecting both the intersection point, the first angle and The heavy packaging bag according to claim 1, wherein the heavy packaging bag extends at a second angle, and the first angle and the second angle have a marginal relationship. The heavy-duty packaging bag according to claim 1 or 2, wherein the length of the edge of the first surface portion constituting the folded-back portion is smaller than the length of the edge of the second surface portion. .. The heavy-duty packaging bag according to any one of claims 1 to 3, further comprising a two-layer structure of an outer tube and an inner tube.

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