JPH09156650A - Particulate-matter-packaging bag made of thermoplastic synthetic resin thin material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove air in a bag main body speedily after the filling of a particulate matter, and make it difficult for a foreign matter such as an insect to enter. SOLUTION: One end of a bag main body 1 comprising a thermoplastic synthetic resin tube is sealed by the application of heat, below the sealed part 2 a front wall 1a and rear wall 1b are fused together by the application of heat along the downward trapezoidal outline continuing to the sealed part 2, and a space between the heat-fused part 3 and the sealed part 2 is a non- storage part 5. The heat-fused part 3 is discontinuous with a plurality of heat- unfused parts left, and the heat-unfused parts are used as air-removal communication parts 4a and 4b, each communicating with the non-storage part 5. The non-storage part 5 is formed wide, a cut 6 for forming a handle is made in it, and the cut is used as an air removal part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging bag made of a thin thermoplastic synthetic resin for granular materials such as rice.

[0002]

2. Description of the Related Art Conventionally, in order to deaerate the air mixed with rice, after packing the granular material such as rice in a packaging bag made of synthetic resin thin material, a seal is provided as shown in FIG. Division (9
A packaging bag (B) provided with a plurality of internal and external communication portions (93) for venting air at a plurality of locations with intermittent 2) is known (Japanese Utility Model Publication No. 62-19551, Japanese Utility Model Publication No. 62-12572).
No. 7, etc.).

[0003] However, in such a conventional packaging bag (B), inner and outer communicating portions (93) (93) ... for air release are provided at an edge along the width direction or the length direction of the bag body (91). 7A, there is a slight gap when no pressing force is applied, or there is a slight gap as shown in FIG. 7A so that the air inside the bag body can be passed without resistance. Part (93) (93) ... upper and lower wall surfaces (93
a) (93b) ... If a pressing force is applied to the wall surface (91a) of the bag body from above to deaerate after filling the granular material, they strongly adhere to each other as shown in FIG. 7 (b). In other words, the air in the bag body acts as a pressure for inflating the end of the bag body (1), so that the front and rear walls (91a)
(91b) is tensioned in the direction of the arrow, and the upper and lower wall surfaces (93a) and (93b) of the air vent communication portions (93) (93) around the air vent internal / external communication portions (93) (93). Are stretched to the left and right, so that the inside and outside communication portions (93) (93) for air release are substantially closed. As a result, the inside / outside communication part (93) (93) ...
The air that is about to escape through the bag through the inner and outer communicating portions (93), (93) for the air vents (93), (93b).
, It becomes difficult to get out of the inside / outside communicating portions (93), (93) ... for air bleeding.

Of course, if the pressing force for deaeration is applied slowly but not abruptly, the tension is reduced, and the upper and lower wall surfaces (93a) of the internal / external communication parts (93) (93) ...
(93b): The degree of adhesion between the members is weakened, the air flow is improved, and the air in the bag is easily released, but it takes a little time to deaerate. Also, if the size of the air vent communication parts (93) (93) ... is set large in advance, degassing can be performed quickly, but foreign matter such as small insects easily enter during storage and transportation after degassing. There is a risk of becoming.

The present invention solves these problems,
An object of the present invention is to provide a packaging bag made of a thin thermoplastic synthetic resin material for a granular material, which can quickly deaerate the inside of the bag body after the filling of the granular material and hardly allow foreign substances such as insects to enter therein.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a sealing portion at the upper end portion or the lower end portion of a bag body formed from a thermoplastic synthetic resin thin material along the width direction of the bag body. The front and rear walls are heat-sealed to each other below or above, a non-accommodating portion is formed between the heat-sealing portion and the seal portion, and the heat-sealing is at least partially with respect to the seal portion. It is performed in a non-parallel manner and is intermittently performed in the parallel portion, leaving one or a plurality of unfused portions, thereby forming an air vent communicating portion that communicates with the non-accommodating portion from the inside of the bag body. On the other hand, a structure in which an air vent is provided in the non-accommodating part is adopted.

It is preferable that the non-accommodating portion is formed in a wide width portion such as a mountain shape or a trapezoidal shape in which the wall surface projects upward or downward at the widthwise central portion of the bag body. This is because the granular material can be filled efficiently. Further, it is preferable that the non-accommodating portion is provided at the upper end portion of the bag body, and the finger insertion hole is cut and raised or formed in the wide width portion. This is because the non-storage section can be used as a handle.

It is preferable that the air vent portion is a cut provided on at least one of the wall surfaces of the non-accommodating portion.
This is because it is difficult for foreign matter such as insects to enter.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. 1 to 4 show an embodiment of a packaging bag made of a thermoplastic synthetic resin thin material for granules according to the present invention, which is manufactured from a thermoplastic synthetic resin tube of polyethylene or the like.

In this packaging bag, the upper and lower edges of the front and rear walls are heat-sealed to form a seal portion (2), and the front and rear walls (1a) and (1b) are sealed below the seal portion (2). (2) is intermittently heat-sealed along the downward trapezoidal contour line, and the granular material is accommodated between the heat-sealed portion (3) and the seal portion (2). A non-container (5) is formed. The heat fusion below the seal portion (2) is intermittently performed with respect to the seal portion (2) in any of the slanted portion and the parallel portion, leaving an unheated fusion portion. An air vent communication part (4a) (4a) whose attached part communicates with the storage part (5) from inside the bag body.
(4b) and (4b).

The wall surfaces (5a), (5b) of the non-accommodating portion are provided with laterally C-shaped cuts (6) for cutting and raising finger insertion holes, and the cuts (6) serve as air vents. I also use it.

As shown in FIG. 2, the packing and packing of the granular material in the packaging bag having the above-described structure is performed by reversing the top and bottom of the bag body (1). 1)
However, after a while, it flows down to the left and right corners of the bottom as shown by the arrow in FIG. 2, so that both the left and right corners can be reliably filled and the piled up state rises in a conical shape in the storage space. However, compared to a flat-bottomed packaging bag, it is considerably delayed, so filling work can be performed efficiently. Then, when the filling of the predetermined amount is completed, the upper end is heat-sealed as in the conventional case to complete the packaging.

After the packaging is completed, when the bag body (1) is pressed for deaeration, the air in the bag body is first in the vicinity of the portion of the heat-sealing portion (3) parallel to the seal portion (2). Of the front and rear walls (1a), (1b) as internal pressure, and also at the portion close to the seal portion (2).
Although it acts as an internal pressure on b), the pressure at that portion is reduced as compared with the vicinity of the parallel portion, so that the opposing surfaces of the air vent communication portions (4a) (4a) in the non-parallel portion may firmly adhere to each other. Absent. Therefore, the air quickly flows out from the air vent communication portions (4a) (4a) in the non-parallel portion to between the non-accommodating wall surfaces (5a) (5b), and then starts to flow to the outside through the air vent portion (6). Then, when a certain amount of air flows out from the air bleeding communication portions (4a) (4a) of the non-parallel portion, the pressure acting in the vicinity of the parallel portion also decreases, so that the air bleeding communication portions (4b) (4) of the parallel portion (4a)
Since air also flows out from b) between the wall surfaces (5a) and (5b) of the non-accommodating part and flows out through the air vent (6) to the outside,
It is possible to deaerate the inside of the bag body in an extremely short time.

In the above embodiment, the front and rear walls (1a), (1b) below the seal portion (2) are heat-sealed along the trapezoidal contour line.
As shown in (a), it may be along a curved contour line at the center and straight lines at both ends thereof. In this case, the non-heat-bonded portion, that is, the air vent communication portion (4a) (4a) (4b)
Similar to the above-described embodiment, (4b) needs to be provided on a line that is not parallel to the seal portion (2) at least at one or a plurality of locations. Further, the air vent portion (6) in the non-storage portion (5) has a non-storage portion wall surface (5
A cut (6) may be provided in a) and this may be used as an air vent.

Further, the heat-sealing portion (3) may be provided in the lower end portion of the bag body and may be corrugated, as shown in FIG. Also in this case, the air vent communication parts (4a) (4
a) ... Are provided on non-parallel lines with respect to the seal portion (2).

Further, the heat fusion portion (3) can adopt various forms other than the illustrated embodiment, for example, it may have a zigzag shape or a combination of a chevron shape and a corrugated shape. good. In short, it suffices that the heat fusion is at least partially non-parallel to the width direction of the seal portion, that is, the bag body, and is intermittently performed to provide the air vent communication portion.

[0017]

According to the present invention, as described above, the sealing portion (2) along the width direction of the bag body (1) at the upper end or the lower end of the bag body (1) formed of a thin thermoplastic synthetic resin material. ) Below or above the front and rear walls (1a) (1b)
They are heat-sealed together to form a non-accommodating portion (5) between the heat-sealing portion (3) and the seal portion (2), and the heat-sealing is at least partially non-parallel. The non-container part (5) is carried out from the inside of the bag body while being carried out intermittently in the non-parallel part, leaving one or a plurality of non-heat-bonded parts.
While the air vent communication part (4a) is formed to communicate with the non-container part (5) and the air vent part (6) is provided in the non-accommodating part (5), it is removed after filling and packaging the granular material such as rice. When the air is blown, the pressure of the air in the bag body is changed by the heat fusion part (3).
Since it acts weaker in the vicinity of the non-parallel portion than other portions, from the air vent communication portion in this portion (4a) ...
The air in the bag body flows out to the non-storage part (5), and the air further passes through the air vent part (6) of the non-storage part and is quickly discharged to the outside of the bag. Therefore, the efficiency of deaeration work after filling and packaging is improved.

The deaeration is performed by the air vent communication part (4a).
(4b) ... and the air vent (6) of the non-container (5), and since the inside of the bag body does not directly communicate with the outside of the bag, foreign matters such as insects enter from outside the bag. It is difficult to do, and a good storage state can be maintained after filling and packaging.

According to the second aspect of the present invention, the wall surfaces (5a), (5b) of the non-accommodating portion (5) are formed in a wide width such as a mountain shape or a trapezoid shape protruding upward or downward at the central portion in the width direction of the bag body. Therefore, during the filling and packaging of the granular material,
It is possible to surely fill the bottom right and left corners, and the cone-shaped rising is delayed, so that the granular material can be efficiently filled.

In the third aspect of the present invention, the non-container portion (5) is provided at the upper end of the bag body and is formed wide, and the finger insertion hole (7) is cut and raised or notched in the wide portion. Therefore, the bag for packaging with a handle can be manufactured at a lower cost as compared with a case where a bag member as a separate member is attached to the bag body.

In the invention of claim 4, since the air vent portion (6) is a cut provided on at least one of the wall surfaces (5a), (5b) of the non-container portion, the air vent portion (6) is introduced into the bag body for foreign matter such as insects. It is easy to prevent the invasion of.

[Brief description of the drawings]

FIG. 1 is a plan view showing a packaging bag according to the present invention with a part cut away.

FIG. 2 is a cutaway plan view of the same filling process.

FIG. 3 is a perspective view after the packaging is completed.

FIG. 4 is a sectional view taken along line IV-IV of FIG. 3;

FIG. 5 is a partially cutaway plan view of another embodiment of the packaging bag according to the present invention.

FIG. 6 is a perspective view of a conventional packaging bag in a state in which granules are filled.

FIG. 7A is a partially enlarged cross-sectional view of the same seal portion before filling, and FIG. 7B is a partially enlarged cross-sectional view of the same seal portion when the bag body is pressed for degassing after filling. .

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Bag main body 1a ... Front wall 1b ... Rear wall 2 ... Seal part 3 ... Heat-sealing part 4a, 4b ... Air vent communication part 5 ... Non-storage part 6 ... Air vent part 7 ... Finger insertion hole

Claims (4)

[Claims] 1. The front and rear walls are heat-sealed to each other below or above a seal portion along the width direction of the bag body at an upper end portion or a lower end portion of the bag body formed of a thermoplastic synthetic resin thin material, A non-accommodating portion is formed between the heat-sealing portion and the seal portion, and the heat-sealing is performed at least partially in a non-parallel shape with respect to the seal portion, and at one or more locations in the non-parallel portion. Of the non-heat-sealed portion of the bag body is intermittently performed to form an air vent communication portion that communicates with the non-storage portion from the inside of the bag body, while an air vent portion is provided in the non-storage portion. Packaging bag made of thermoplastic synthetic resin thin material for granular materials, characterized by: 2. The thermoplastic synthetic resin for granular materials according to claim 1, wherein the non-accommodating portion is formed in a wide width such as a mountain shape or a trapezoid shape in which a wall surface projects upward or downward at a central portion in the width direction of the main body. Thin material packaging bag. 3. The thin thermoplastic synthetic resin for particulates according to claim 2, wherein the non-accommodating portion is provided at the upper end of the bag body, and the finger insertion hole is formed by cutting and raising or notching in the wide portion. Material packaging bag. 4. The packaging bag made of a thin thermoplastic synthetic resin material for granules according to claim 1, wherein the air vent is a cut provided on at least one of the wall surfaces of the non-accommodating portion.