JPH10230946A - Packaging bag for rice or the like - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging bag for rice or the like in a high productivity, which has excellent deaeration and insect-repellent properties, in a plastic packaging bag for rice or the like provided with a plurality of small holes for deaeration. SOLUTION: In this packaging bag 10 for rice or the like, a film 1 for the body of the packaging bag and an auxiliary film 2 forming an opening part composed of a plurality of deaeration holes 5 are separately produced and the opening part in the film 1 for the body is cut off by specified dimensions and the auxiliary film 2 with deaeration holes is heatsealed to the part and connected to the film 1 and form a bag. A laminate film is used for the auxiliary film 2. The diameter of the opened holes is 100-1000μm. It is preferable to use a laser beam radiator as a forming means for holes as the functions and productivity of the packaging bag can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to packaging rice grains,
More specifically, the packaging bag used for distribution has a plurality of holes formed to prevent excess air remaining inside the packaging bag and prevent the bag from being broken when rice grains are sealed and stacked in the packaging bag. The present invention relates to a technology of a rice cereal packaging bag provided with a hole.

Conventionally, as packaging bags used for packaging and distributing rice grains, packaging bags produced by heat-bonding a plastic multi-layer laminated film or a single-layer film in a bag shape are usually used. Have been. As the film forming the bag, for example, a biaxially stretched nylon film /
A multilayer laminated film such as an aluminum-deposited polyethylene terephthalate film / linear low-density polyethylene layer laminated film, a biaxially stretched nylon film / linear low-density polyethylene layer laminated film, or a linear low-density polyethylene monolayer. Layer films and the like are used.

[0003] When filling and packaging rice grains in a packaging bag formed of such a film, a vertical filling and packaging machine is usually used. When top sealing is performed after filling, as much air as possible is left in the head space. As described above, a method of mechanically pressing a jig such as sponge rubber from both sides to perform deaeration packaging is adopted.

[0004] However, when the contents are rice cereals, they are heavy, and when the packages after encapsulation are accumulated and stacked, a large load is applied to the lower package. Sufficient and still remaining air causes unstable stacking and easy collapse of the load. In addition, there is a problem that the internal pressure increases and the bag is broken. For this reason, the packaging bag is provided with an appropriate number of holes having a hole diameter of 1 to 2 mm and a notch having a length of about 2 mm in order to allow extra remaining air to escape, or a back seal when the bag is a pillow type. Measures have been taken, such as attaching non-woven tape to some of the parts.

[0005]

In the above-mentioned prior art, for example, when a hole having a hole diameter of 1 to 2 mm is provided in a packaging bag, it is large enough to allow excess air in the bag to escape. The number of openings per bag may be small, and the reduction in bag strength due to this is not a problem. However, if the hole diameter is 1
In the case of ２2 mm, there is a problem that pests such as black elephants and black elephants invade through the opening and eat contents such as rice. Also, if a notch with a length of about 2 mm is provided,
It is easy to tear from the cut and the cut becomes large, and similarly to the above, there is a problem of insect damage and, in some cases, a problem of spilling of the contents. And, in the method of sticking a non-woven tape to a part of the back seal part, the deaeration is excellent, but the sealing strength is not enough, and when compared with the former,
There was a disadvantage that the members and their attachment were expensive in terms of cost.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a rice cereal packaging bag provided with a plurality of holes for deaeration. The size and the number of the holes, the distance between the holes and the like are defined in appropriate ranges, respectively, so that the problem of strength reduction of the packaging bag does not occur, and the packaging bags after filling the contents are stacked. In this case, it is an object of the present invention to provide a packaging bag for rice cereals excellent in performance in which excess air can be smoothly degassed and pests can be prevented from entering through holes.

[0007]

Means for Solving the Problems As a result of earnest studies to solve the above problems, in order to prevent invasion of pests such as black elephants and black elephants, the upper limit of the hole diameter of the hole provided in the packaging bag is set to 1000 μm or less, and the lower limit is set to 1000 μm or less. Although not as strict as the upper limit, it is preferably 100 μm or more in order to obtain good deaeration. The number of holes must be such that when the package is stacked after the contents are enclosed, it can be degassed at such a speed that the bag does not break due to the internal pressure of the air remaining inside. It is necessary to open the appropriate number of holes at appropriate intervals.

Further, in order to minimize the reduction in the strength of the packaging bag due to the perforation and to obtain good deaeration, the distance between the holes (the distance between the ends of adjacent holes) must be two.
mm or more, and it is sufficient to provide a required number of holes,
Based on this knowledge, based on this, repeated experiments in which a predetermined amount of contents was actually enclosed in a packaging bag of predetermined dimensions with openings under various conditions and stacked on a pallet, and examined. As a result, the present invention has been completed.

That is, a first aspect of the present invention is a packaging bag formed by thermally bonding a plastic single-layer or laminated film in a bag shape, wherein a cutout portion is provided in a part of the packaging bag. In addition, the cutout portion is sealed with a film having an opening portion formed by a plurality of holes and sealed by heat bonding. By adopting such a configuration, it is possible to provide an opening at an appropriate position according to the form of the packaging bag, such as a pillow type, a three-side seal type, a four-side seal type, and at the same time, a film different from the packaging bag body. Since the opening portion can be machined, holes having a desired hole diameter can be machined accurately at predetermined intervals. Therefore, it is possible to produce a packaging bag for rice cereals excellent in performance such as the strength, degassing property, and prevention property of insect pests of the packaging bag with high productivity.

[0010] According to a second aspect of the present invention, the plurality of holes forming the opening have a maximum diameter of 100.
2. The packaging bag for rice cereals according to claim 1, wherein the thickness is from 1000 to 1000 [mu] m. By adopting such a configuration, it is possible to obtain more reliable prevention of pests from entering, and at the same time, it is possible to maintain good deaeration and bag strength.

According to a third aspect of the present invention, the plurality of holes forming the opening are holes opened by irradiation of a laser beam. Consisting of packaging bags for rice cereals. By adopting such a configuration, a highly accurate hole having a predetermined size and interval can be obtained even for a small hole whose maximum portion has a hole diameter in the range of 100 to 1000 μm. In the present invention, the hole diameter means the diameter of the hole when the shape of the hole is a circle, and the diameter of the largest portion when the shape of the hole is other than a circle, for example, an elliptical shape or a square shape. is there.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the rice cereal packaging bag of the present invention will be described below. The rice cereal packaging bag of the present invention is characterized by the manner in which the opening portion for deaeration is provided, and the form of the bag itself is not particularly limited. Any type of packaging bag such as a four-sided seal type and a pillow type may be used. In addition, the packaging bag for rice cereal of the present invention has a film used for the main body portion of the packaging bag, and a belt-like shape provided with an opening for deaeration and used to seal a notch provided in the packaging bag. It is formed of two types of films, such as an auxiliary film such as a tape.

In the case of a three-side seal type or four-side seal type packaging bag, the auxiliary film provided with the opening is attached to the packaging bag at the top, bottom, left and right edge portions of the film on the front and back surfaces. Alternatively, the pillow-type packaging bag may be attached to any of the top and bottom, left and right edges, or the center of the packaging bag. However, in the case of the pillow format,
By using a narrow film with the back seal part cut to a predetermined width on the film of the main body part, an auxiliary film can be attached so as to bridge this notch, it can be processed at the same time as bag making, productivity It is preferable because it is excellent.

Next, the film used for the main part of the packaging bag is not particularly limited, and any of plastic single-layer or multilayer laminated films conventionally used for rice cereal packaging bags can be used. it can. For example, in a multilayer laminated film, biaxially stretched nylon film / adhesive layer / linear low density polyethylene layer biaxially stretched polyethylene terephthalate film / adhesive layer / linear low density polyethylene layer biaxially stretched polyethylene terephthalate film / adhesive layer / Use biaxially oriented nylon film / adhesive layer / linear low density polyethylene layer Biaxially oriented nylon film / adhesive layer / aluminum deposited biaxially oriented polyethylene terephthalate film / adhesive layer / linear low density polyethylene layer can do. Also, 2
An axially-stretched polypropylene film or the like can also be used as a surface layer of the above-mentioned laminated film depending on the strength condition (filling amount of contents and the like).

In the above structure, the sealant layer is indicated as a linear low-density polyethylene layer, but it is formed by using a linear low-density polyethylene film and applying an adhesive layer by a dry lamination method. It may be laminated by laminating with the substrate film on the front side through
Also, using pellets of linear low-density polyethylene,
Extrusion coating may be performed on the surface of the substrate film on the front surface side via an adhesive layer such as an anchor coat and then laminated.

As the single-layer film, a film such as a linear low-density polyethylene can be used. In this case, a single-layer film of a linear low-density polyethylene may be literally used, but for example, a film having a laminated structure in which the same linear low-density polyethylene films are bonded to each other via an adhesive layer by a dry lamination method or the like. Is also good. Less than,
Biaxially stretched nylon film is ON, biaxially stretched polyethylene terephthalate film is PET, aluminum deposited biaxially stretched polyethylene terephthalate film is VM-PE
T, linear low density polyethylene, is abbreviated as LLDPE.

Next, the configuration of the auxiliary film such as a belt-shaped (tape-shaped) film having an opening differs depending on which part of the packaging bag is used and how. That is,
When the auxiliary film is used at the edge of the film forming the packaging bag, for example, the back seal portion is cut at a predetermined width with a pillow-type packaging bag, and the left and right films are bridged from the inner surface side. When heat-sealing, or using a three-sided or four-sided sealing type packaging bag, cut either the upper, lower, left, or right edge at a predetermined width, and replenish the part from the inner side. When using with heat sealing, the surface to be joined to the packaging bag by heat sealing and the surface to be heat sealed when forming the bag by heat sealing around the packaging bag are different. It is necessary to use an auxiliary film provided with.

Then, of the two films on the front and back sides of the packaging bag, for example, one of the films is cut into a window shape with a predetermined size, and the portion is covered from the inside with an auxiliary film, and the periphery is heated. When using with sealing,
A film provided with a sealant layer only on one side can be used.

As such an auxiliary film, basically, a film having the same structure as the film used for the main body of the packaging bag or a structure similar thereto can be used. Therefore, when the sealant layer only needs to be on one side, the film used for the main body can be used by cutting it to the required size as it is, and when the sealant layer is required on both sides, for example, When the film to be used has a configuration in which a sealant layer is provided on one side of the base film, the same sealant layer is laminated on the other side of the base film, and is used as a configuration in which a sealant layer is provided on both sides. be able to.

The auxiliary film is provided with an opening for deaeration consisting of a plurality of holes having a predetermined hole diameter. If a decrease in the strength of the film due to the opening is expected, the base film layer is used. The thickness can be increased, or the number of layers can be increased, for example, by adding an intermediate layer. By adopting such a method, the strength of the packaging bag can be prevented from being reduced only by changing the configuration of the auxiliary film, and there is no need to change the film of the main body, which is economically advantageous.

Specific examples of the structure of the auxiliary film include the following structures. (When the sealant layer is on only one side) ON / adhesive layer / LLDPE layer PET / adhesive layer / LLDPE layer PET / adhesive layer / ON / adhesive layer / LLDPE layer ON / adhesive layer / VM-PET / adhesive layer / LLDPE layer (When sealant layer is on both sides) LLDPE layer / adhesive layer / ON / adhesive layer / LLDPE layer LLDPE layer / adhesive layer / PET / adhesive layer / LLDPE
Layer LLDPE layer / adhesive layer / PET / adhesive layer / ON / adhesive layer / LLDPE layer LLDPE layer / adhesive layer / ON / adhesive layer / VM-PET
/ Adhesive layer / LLDPE layer In addition to the above, the film of the main body portion of the packaging bag is, for example, L
In the case of a film made of LDPE alone, a film made of LLDPE alone can be used as an auxiliary film in addition to the above-mentioned structure.

The auxiliary film as described above is provided with openings formed by opening holes having a predetermined diameter at predetermined intervals in a row or the like. The hole will be described. First, as for the size of the hole for deaeration, it is preferable that the diameter of the hole be large in order to quickly deaerate excess air in the bag. However, if the pore size is too large, invasion of pests and spillage of the contents, and furthermore, problems such as a decrease in bag strength occur. In particular, from the viewpoint of preventing the invasion of pests, the pore size is 1000 μm or less as an upper limit. Is preferable. And although the lower limit of the pore size is not as strict as the upper limit,
If it is too small, the degassing rate will decrease, so it will be necessary to increase the number of holes. With this, for example, unless measures are taken to increase the number of holes, the distance between holes is also reduced. Need arises. However, if the hole spacing is too small,
In addition to reducing the strength of the bag, the workability of opening holes also decreases.
Therefore, the lower limit of the pore diameter is preferably set to about 100 μm. For the above reasons, the holes provided in the auxiliary film (finally, the packaging bag) preferably have a hole diameter of 100 to 1000 μm, more preferably 150 to 500 μm.

Next, the distance between the holes (the distance between the adjacent holes and the ends of the holes) is determined by, for example, the number of holes in order to improve the deaeration when the number of holes is constant. Is preferably increased, and for this purpose it is necessary to reduce the interval between the holes. However, if the distance between the holes is too small, the strength of the packaging bag is reduced. In addition, if the interval between the holes is increased, there is no problem in terms of strength, but the number of holes is reduced, and the degassing property is reduced. Therefore, it is preferable that the distance between the holes is also adjusted to a certain range, and specifically, it is preferable that the distance between the holes is in the range of 2 to 5 mm.

When holes are provided in a row in the auxiliary film under the conditions of the hole diameter and the hole interval as described above, in order to obtain good deaeration, for example, the auxiliary film is provided over the entire length in the length direction of the packaging bag. In the case of attachment, the number of aperture rows may be two or more, and in the case of attaching an auxiliary film to the entire length in the width direction of the packaging bag, three or more rows may be provided. If the aperture rows are too close, the strength such as the drop strength of the packaging bag is reduced as in the case of the aperture intervals. Therefore, it is necessary to provide a predetermined row interval.

In this case as well, the auxiliary film is provided, for example, over the entire length in the longitudinal direction of the central portion of the packaging bag, or
Since the degree of influence on the strength decrease differs depending on whether the left and right edge portions are provided over the entire length, it is preferable to appropriately change and adjust the row spacing. For example, when the auxiliary film is provided on the entire length of the central portion of the packaging bag in the length direction, the row interval of the aperture row is preferably 4 mm or more. Is preferably 6 mm or more.

In the method of providing the holes as described above in the auxiliary film, when the hole diameter is as large as 1 to 2 mm as in the conventional product, the holes can be formed by the usual punching method. In the case where the diameter is as small as 1000 μm, a method using a heating needle or the like or a method using laser beam irradiation can be preferably applied.

The laser beam is used to form a hole in the auxiliary film using a pulse oscillation type laser irradiation. However, if the laser can be controlled on and off in the order of microseconds, it may be intermittent in spots, cuts, or the like. Drilling can be freely performed. As the type of laser, a carbon dioxide laser, a YAG laser, a semiconductor laser, an argon ion laser, and the like can be used, and there is no particular limitation, but in order to form a hole in the film, the film absorbs a laser oscillation wavelength and generates heat. And
Mist conversion is necessary, and from this point, a carbon dioxide laser can be particularly preferably used.

The wavelength of the carbon dioxide laser beam is 10.6 μm
Many films such as nylon, polyethylene terephthalate, and polypropylene, which are widely used as packaging materials, can absorb this and generate heat, but can be opened.
Since the low-density polyethylene film is hardly absorbed and penetrates, it is difficult to open the hole with the output number of the laser used for opening the ordinary film. However, when low-density polyethylene is laminated with a film that absorbs carbon dioxide laser light as described above, or when low-density polyethylene films are laminated via an adhesive layer that absorbs laser light. In this case, the layered film absorbs the carbon dioxide gas laser light by irradiating the laminated film with the output adjusted and radiated.

By using such a laser beam as a means for drilling, a hole diameter of several tens μm to 1000 μm can be obtained.
Even with a small hole of m, there is an advantage that the hole can be opened with a stable hole diameter and with high productivity, and the hole diameter and the hole interval can be easily changed.

[0030]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described more specifically below with reference to the drawings and embodiments. However, the present invention is not limited to these drawings,
The invention is not limited to the embodiments. FIG. 1 is a schematic plan view illustrating the configuration of an embodiment of the rice cereal packaging bag of the present invention.

In FIG. 1, a packaging bag 10 for rice grains is constituted by applying a pillow-type packaging bag. That is, the packaging bag 10 for rice cereal has a body portion on the left and right sides of the roll-shaped main body film 1 having a predetermined width, and a center portion with a folding diameter A having a predetermined width such that the sealant layer is on the inside. A predetermined width (auxiliary film width B) is provided inside a gap having a predetermined width (a portion corresponding to the effective width C of the auxiliary film) formed between both ends of the folded main body film 1. The auxiliary film 2 is inserted, and both edges are heat-sealed with heat-sealing portions 4a and 4b to form a cylindrical shape. Next, the bottom portion is formed by successively heat-sealing the bottom body heat-seal portion 3 at a predetermined interval so that the cylindrical body portion has a predetermined length. The rear portion is sequentially cut to form individual rice cereal packaging bags 10. In the area of the auxiliary film effective width C of the auxiliary film 2, an opening for deaeration formed by a plurality of holes is provided, and the opening has a hole diameter of 100 to 1000 μm. But the hole interval 2
Holes are formed in a row along the entire length in the vertical direction at 5 mm, and two or more rows of the holes are spaced at a row interval of 4 mm or more (3 in the figure).
Columns).

Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples. Example 1 In the embodiment shown in FIG. 1, a packaging bag for filling and packaging 10 kg of rice and having an outer dimension of 340 mm in width and 570 mm in length is made of a laminated film, and a film used for a main body portion (hereinafter referred to as a main body) Film) has a thickness of 3
A 0-μm linear low-density polyethylene (LLDPE) film and a 60-μm-thick LLDPE film are bonded by a known dry lamination method using a two-component reactive urethane-based adhesive to form a 667 mm-wide roll. Was produced.

The auxiliary film has a thickness of 30 μm on both sides of a biaxially stretched nylon film (ON) having a thickness of 15 μm.
m LLDPE films were used as a sealant layer and bonded together by a dry lamination method in the same manner as described above to produce a rolled-up laminated film having a width of 27 mm.

Next, in order to provide openings for deaeration, that is, a plurality of holes (opening rows), in the wound laminated film for the auxiliary film, a carbon dioxide laser was used to form the center of the laminated film. In the area with a width of 15 mm, a vertically long elliptical hole having a major axis of 300 μm and a minor axis of 150 μm is formed as an aperture row with a hole interval of 2 mm along the flow direction, and the number of rows is 2 and the row interval is 5 mm. To form an auxiliary film having an opening.

Next, the left and right sides of the main body film are folded at a folding diameter of 340 mm by a bag making machine using the main body film and the auxiliary film. The center part has a gap with a width of 15 mm (effective width of the auxiliary film), the auxiliary film is inserted inside the gap, and both edges are heat-sealed along the flow direction with a heat seal width of 5 mm. Sealing to produce a cylindrical film having a folded diameter (bag width) of 340 mm, and further performing a bottom seal with a heat seal width of 10 mm while feeding the cylindrical film at a feed pitch of 570 mm, to form a bottom heat seal portion After the formation, the portion immediately after the bottom heat seal portion is sequentially cut so that the outer dimensions are 570 length.
Example 1 A packaging bag for rice cereal of Example 1 was prepared in which the upper part was opened with a width of 340 mm and the opening was provided by an auxiliary film (effective width 15 mm) in the entire length of the central part of the bag.

Example 2 In the configuration of the rice cereal packaging bag of Example 1, except that only the hole interval of the opening portion provided in the auxiliary film was changed to 3 mm, the same as Example 1 was carried out. To prepare a packaging bag for rice grains of Example 2.

(Example 3) In the configuration of the rice cereal packaging bag of Example 1, the number of aperture rows of the apertures provided in the auxiliary film was increased to three rows, and the row interval was changed to 4 mm. Were all processed in the same manner as in Example 1 to produce a packaging bag for rice cereals in Example 3.

(Example 4) In the configuration of the rice cereal packaging bag of Example 1, the hole interval of the apertures provided in the auxiliary film was changed to 3 mm, and the number of aperture rows was reduced to three. All were processed in the same manner as in Example 1 except that the row spacing was changed to 4 mm to produce a packaging bag for rice cereals of Example 4.

(Comparative Example 1) In the configuration of the rice cereal packaging bag of Example 1, only the size of the hole of the opening provided in the auxiliary film was changed to a vertically long elliptical hole having a major axis of 1500 μm and a minor axis of 800 μm. All were processed in the same manner as in Example 1 except that the packaging bag for rice grains of Comparative Example 1 was prepared.

As described above, the structure of the opening portion for deaeration provided in each rice cereal packaging bag of Examples 1 to 4 and Comparative Example 1
That is, the effective width of the auxiliary film (the width at which the opening is provided), the shape and size of the holes (hole diameter), the interval between the holes, the number of rows opened, the interval between the rows, the total number of holes ( The total number of effective holes excluding the upper and lower heat seal portions) is as shown in Table 1.

[0041]

[Table 1] * 1: The effective width of the auxiliary film is the width of the part exposed on the surface of the packaging bag, excluding the heat-sealed part of the auxiliary film joined to the packaging bag by heat sealing, that is, the width available for the opening. Means * 2: The hole spacing is the distance between adjacent holes and the ends of the holes. * 3: The row spacing is the distance between the lines formed at the ends of the holes in each row of adjacent rows.

[Evaluation and Results] Using the packaging bags of Examples 1 to 4 and Comparative Example 1 prepared as described above as samples, the degassing property and the strength of the bags (drop test of the packaging bags after enclosing the contents) , And a stacking test), and the prevention of pest invasion was evaluated. The results are shown in Table 2.

(1) Test of degassing time 12 L of air was sealed in each packaging bag, and the time (seconds) until completely degassed by applying a load of 5 kg per bag.
Was measured. In addition, the evaluation of this test is a commercial 10 kg
A relative evaluation was made based on the actual value of 66 seconds for the rice bags (bags provided with holes by punching), and the following rankings were made. (Evaluated by the average value of 10 samples each) (Symbol) (Evaluation criteria) （(Excellent): Degassed faster than a commercially available rice bag (66 seconds). Good (good): Equivalent to a commercially available rice bag (66 seconds) to +20 seconds (86 seconds in total). (Even with this level of degassing, there is no practical problem with no breakage in the drop test and the stacking test.) × (poor): Degassing is slower than commercial rice bags (66 seconds) by 21 seconds or more (total 8). It takes more than 7 seconds).

(2) Strength test of packaging bag (a) Drop test 10 kg of rice is sealed in each of 10 packaging bags of each sample, and dropped 10 times vertically from a height of 1 m.
The presence or absence of bag breakage was examined, and those without bag breakage were evaluated as good, and those with bag breakage were evaluated as poor, and the results are shown in Table 2 by symbols.

(B) Stacking test 10 kg of rice was sealed in the packaging bag of each sample, and 10 samples were stacked on a pallet, transported to a warehouse, stored for 3 days, taken out and checked for broken bags. Table 2 shows the results as symbols, in which the samples without breakage were evaluated as good and the samples with breakage were evaluated as poor.

(3) Prevention of pest invasion After storing the packaging bags (3 bags each) of each sample containing 10 kg of rice in an environment where pests are present outside, the presence or absence of pest invasion is examined. , Those without pest infestation are good,
Those having the pest infestation were evaluated as poor x, and the results are shown in Table 2 by symbols.

[0047]

[Table 2] Evaluation results As is clear from the evaluation results shown in Table 2, Examples 1 to
The packaging bag of No. 4 was good without any problem in each test item. On the other hand, the packaging bag of Comparative Example 1 was not preferable because a part of the bag was broken in the drop test, and the pests were invaded.

[0048]

As described above in detail, according to the present invention, the strength of the bag is not impaired, and the contents such as rice remain in the bag even when the contents such as rice are encapsulated, accumulated and stacked. The present invention has the effect of easily providing a packaging bag for rice cereals excellent in performance that can release excess air to the outside smoothly, does not cause bag breakage due to an increase in internal pressure, and can prevent invasion of pests. In addition, since the opening of the packaging bag is provided on an auxiliary film different from the film of the main body, the lamination structure can be easily changed, and laser light can be used for the opening means. By doing, the pore size is several tens
Even with a small hole having a diameter of m to 1000 μm, holes having a stable hole diameter can be formed at predetermined intervals with high productivity. Furthermore, it is easy to change the hole diameter, hole interval, and line interval, so that it can easily accommodate packaging bags of different sizes, and the mounting position of the auxiliary film with the opening can be freely selected, so that the performance can be improved. It is effective in providing a rice cereal packaging bag with excellent productivity with high productivity.

[Brief description of the drawings]

FIG. 1 is a schematic plan view illustrating the configuration of an embodiment of a rice cereal packaging bag of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Main body film 2 Auxiliary film 3 Bottom heat seal part 4a, 4b Body heat seal part 5 holes A Folding diameter B Auxiliary film width C Effective width of auxiliary film 10 Packaging bag for US grain

Claims (3)

[Claims] 1. A packaging bag formed by thermally bonding a plastic single-layer or laminated film in a bag shape, wherein a notch is provided in a part of the packaging bag, and the notch is
A packaging bag for rice cereals, characterized by being sealed by thermal bonding with a film having an opening formed by a plurality of holes. 2. The packaging bag for rice cereals according to claim 1, wherein the plurality of holes forming the opening have a maximum diameter of 100 to 1000 μm. 3. The packaging bag for rice cereals according to claim 1, wherein the plurality of holes forming the opening portion are holes opened by irradiation with laser light.