JPH09240686A - Packaging bag for rice or the like - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide packaging bags for rice or the like with a plurality of small holes for deaeration, with a high productivity, which has an excellent deaeration property and prevents insects from penetrating in the bag and also which does not bring the decrease of strength in the packaging bag. SOLUTION: This packaging bag is a pillow type bag 10 made of plastic laminate film and a plurality of deaeration holes with 100-1000μm dia. are arranged at every specified distance to make a row. This opening row is provided at least at one position in both right and left side zones 7 along the root of the rear seal part 1 of the packaging bag and at least at one position in zones 4a, 4b, 3a, 3b, 5a, 6a (the opposite side face is common in 5a, 6a) along the right and left and the upper and lower ends, to constitute a packaging bag 10 for rice or the like. These small dia. holes can be stably opened in a high productivity by using laser beam and the hole diameter, the hole pitch, and the position of the opening row, etc., can be easily changed and the productivity can be remarkably increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rice grain packaging bag having a deaeration hole, and more specifically, when providing a deaeration hole in a packaging bag, the diameter of the hole and the distance between the holes. , And the technology of a packaging bag for rice grains that does not impair the strength of the packaging bag by defining the position where the hole is provided in an appropriate range and has both excellent deaeration performance and pest intrusion prevention property Regarding

Conventionally, as a packaging bag used for packaging and distributing rice grains, a packaging bag manufactured by heat-bonding a plastic multilayer laminated film or a single-layer film into a bag shape has been used in most cases. It was The film forming the bag is, for example, a laminated film of biaxially stretched nylon film / aluminum-deposited polyethylene terephthalate film / linear low-density polyethylene layer, or biaxially stretched nylon film / linear low-density polyethylene layer. A multi-layer laminated film such as a laminated film or a single layer film of linear low density polyethylene is used.

The form of the packaging bag formed from such a film is such that when a single layer film is used, it is bottom-sealed in a tube formed by inflation molding, and when a multilayer laminated film is used, it is a three-way seal type or Pillow type packaging bags are mainly used. And
When filling and packaging rice grains in these packaging bags, a vertical filling and packaging machine is usually used.When filling and top-sealing after filling, in order to leave as little air as possible in the headspace part, a sponge rubber or the like is used from both sides. A method of mechanically pressing a tool to perform deaeration packaging is adopted. However, when the content is rice grains, it is a heavy weight, and when the packed packages after encapsulation are stacked and piled up, a large load is applied to the lower package, so the above deaeration is not sufficient. However, there is a problem that the internal pressure rises due to the remaining air, which causes bag breakage.
For this reason, the packaging bag is provided with holes with a diameter of 1 to 2 mm and notches with a length of about 2 mm so that excess air that remains may be released, or if the bag is a pillow type, a back seal is used. Measures have been taken such as applying non-woven tape to part of the section.

[0004]

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 holes to be opened per bag may be small, and the decrease in bag strength due to this is not a problem. However, if the hole diameter is 1
In the case of ˜2 mm, there was a problem that harmful insects such as kouzo, kouzo elephant, etc. invaded from the openings to eat the contents such as rice. Also, when making a notch with a length of about 2 mm,
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 pasting the non-woven tape on the spine seal part, the usual deaeration is excellent, but when the contents are actually filled and packed and accumulated and piled up, the tape pasted part is crushed. Therefore, the deaeration property of the air remaining in the bag is reduced. Further, in the case of this form, the number of members is increased, and the degree of processing such as attachment thereof is increased, so that there is also a drawback that the cost is high.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a packaging bag for rice grains provided with deaeration holes, the packaging bag being provided in the packaging bag. By defining the diameter of the holes, the distance between the holes, and the positions where the holes are provided in appropriate ranges, the problem of lowering the strength of the packaging bag does not occur, and the packaging bag after filling To provide a highly productive packaging bag for rice grains with excellent performance that degassing is not hindered even when piled up, smooth degassing is possible, and in addition, pests can be prevented from entering through the openings. is there.

[0006]

[Means for Solving the Problems] As a result of intensive research to solve the above problems, as a result, in order to prevent the invasion of harmful insects such as foxtail and foxtail, the diameter of the holes provided in the packaging bag (if the holes are not circular, the maximum diameter is Diameter) of 1000 μm or less. The number of holes is preferably such that, when stacking the packages containing the contents, it can be degassed at a speed that does not cause bag breakage due to the internal pressure of the air remaining inside, and it is an appropriate number depending on the hole diameter. It is necessary to open the holes in. Also,
In order to minimize the decrease in strength of the packaging bag due to the holes and to obtain good degassing properties, it is sufficient to keep the distance between the holes within a range of about 5 to 10 mm and secure the necessary number of holes. .

Further, in order to prevent the deterioration of deaeration due to the stacking of the packaging bags after filling, it is preferable to provide holes on the outer peripheral side surface such as the left and right sides or the upper and lower sides of the bags. In order to reduce the decrease as much as possible, it is preferable to install it in the center of the packaging bag. From this point, when the packaging bag is a pillow type bag, a back seal portion having a width of about 10 mm is formed in the longitudinal direction of the central portion of the bag, so that the packaging bags containing the contents are stacked. Also, on both sides of the laid back seal part,
A gap is formed due to a difference in film thickness (step), and a gap due to the bending resistance of the film is also formed below the root of the laid back seal portion. Therefore, in the case where a hole for deaeration is provided in the region of the packaging bag facing the void, the void is used as a vent passage for the deaerated air, and the finding that the deaeration property of the packaging bag is not impaired. In this region, at least one opening row in which holes are opened at a predetermined hole diameter and interval is provided in this region, and by that amount, by reducing the opening row provided on the outer peripheral side surface such as the left and right sides or the top and bottom sides of the bag, The present invention has led to the completion of a packaging bag for rice grains that has more stable strength and is excellent in deaeration and invasion prevention of harmful insects.

That is, the invention according to claim 1 is a pillow type packaging bag formed by thermally adhering a plastic laminated film, wherein the packaging bag has a plurality of holes having a hole diameter of 100 to 1000 μm at predetermined intervals. It has a linear array of holes,
The opening row is closed at least at one position on both left and right sides along the root of the back seal portion of the packaging bag, and when the packaging bags containing rice grains are stacked, they are closed by the packaging bag. The packaging bag for rice grains, which is provided at least at one place in the region along the left and right or the upper and lower ends of the packaging bag. The invention according to claim 2 is characterized in that the holes in the row of holes provided in the packaging bag are holes opened by irradiation of laser light. It consists of a packaging bag.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the rice cereal packaging bag of the present invention will be described below. The packaging bag for rice grains of the present invention has a pillow bag packaging form.
A laminated film is usually used for this type of packaging bag. The material constitution of the laminated film is not particularly limited, and any of the plastic multilayer laminated films conventionally used for rice grain packaging bags can be used. Specifically, as described above, in the multilayer laminated film, the biaxially stretched nylon film / adhesive layer / linear low-density polyethylene layer or the biaxially stretched nylon film / adhesive layer / aluminum vapor-deposited biaxially stretched polyethylene terephthalate film. A laminated film such as / adhesive layer / linear low-density polyethylene layer is often used. In addition to this, a biaxially oriented polypropylene film or the like can also be used for the surface layer or the like depending on the strength condition. (Hereinafter, the biaxially stretched nylon film is abbreviated as ON, the biaxially stretched polyethylene terephthalate film is abbreviated as PET, and the linear low-density polyethylene is abbreviated as LLDPE.)

In the above, dry laminating method or extrusion laminating method using an adhesive resin can be used for laminating films such as ON and aluminum vapor-deposited PET, and aluminum vapor-deposited PET or LLDPE layer on the ON surface can be formed. For lamination, film-shaped LLDPE may be laminated by a dry lamination method, or LLDPE resin may be extrusion-coated to laminate. Further, the aluminum vapor deposition layer having the above structure may be removed if unnecessary. When the aluminum vapor-deposited layer is unnecessary as described above, not only the constitution but also all the layers may be formed into a laminated film by a multi-layer coextrusion method.

The packaging bag for rice grains of the present invention is formed by thermally adhering the above plastic laminated film in a bag shape to form a packaging bag. At this time, the packaging bag is a pillow type bag. And, at the predetermined position of the packaging bag, for the purpose of degassing, it is characterized by being provided with an opening row in which holes of a predetermined size (hole diameter) are arranged at predetermined intervals, as appropriate. , These will be explained.

First, a deaeration hole provided in the packaging bag, that is,
The position of the row of apertures is usually such that after packing the contents in a packaging bag and then stacking the bags by stacking and stacking them, the holes provided in this state are blocked by the adjacent packaging bodies vertically and horizontally. To prevent it from coming off, for example, the side surface (curved surface) of the outer peripheral edge of the bag
It is preferable to provide the above. However, in the case where the packaging bag is a pillow type bag, as described above, even when the back seal portion is laid down, even in the central portion of the bag, a region having a width of about 5 to 6 mm along both sides thereof is formed. A gap is created due to the difference in film thickness (step), and in the lower side near the base of the laid back seal part, a region of about 5 to 6 mm width from the base is due to the bending resistance of the film of the back seal part. Since voids are formed, these can be used as a ventilation path for deaerated air.

Therefore, within the above range, even if the packing bag is provided with the deaeration hole array, the stacking of the packing bags after filling does not impair the degassing property. It has been found that the provision in this region has less effect on the drop strength of the packaging bag after filling the contents, etc., than the provision in the region on the side surface of the outer peripheral edge of the packaging bag. And
In the rice grain packaging bag of the present invention, since there are two or more rows of apertures, usually about two or more rows are provided due to the relationship between the diameter of the holes and the distance between the holes. It is preferable that at least one open hole row is provided in each of the region and the region on the side surface of the outer peripheral edge of the bag.

Incidentally, the area of the end side surface of the outer periphery of the bag is specifically designated by a numerical value because the size of the end side surface of the bag also varies depending on the size of the bag and the filling amount of the contents. It is difficult, but as a standard example, the outer size is 340 mm.
10k in a pillow type bag of (width) x 570mm (length)
In the case of encapsulating g of rice, the area on the left and right sides is 5 mm to 40 mm from both ends, and the area on the upper and lower sides is 5 mm to 40 mm from both ends excluding the sealing margin. It is preferable to provide a row of apertures in the area. Similarly, dimension 280 mm (width) ×
When 5 kg of rice is enclosed in a 470 mm (length) bag,
In addition, when 2 kg of rice is enclosed in a bag having dimensions of 220 mm (width) x 350 mm (length), the area from 5 mm to 30 mm from the ends on both the left and right sides and both ends excluding the seal margins on the upper and lower sides Further, it is preferable to provide the row of apertures in a region in the range of 5 mm to 30 mm.

Next, the size of the holes provided in the packaging bag is preferably large so that the air in the bag can be quickly degassed. However, if it is too large, problems such as invasion of pests, spillage of contents, and decrease in bag strength will occur, and in particular from the viewpoint of preventing invasion of pests, the upper limit of the pore diameter (the diameter of the largest part if the hole is not circular) is It is preferably 1000 μm or less. Then, the lower limit of the pore size is not as strict as the upper limit, but since the degassing rate decreases when it is too small, it is necessary to increase the number of holes, and accordingly, unless the number of aperture rows is increased, The distance between the holes also becomes smaller. As a result, the bag strength is reduced and the workability of the opening is also reduced. Therefore, the lower limit of the pore diameter is preferably set to about 100 μm. For the above reasons, the holes provided in the packaging bag preferably have a hole diameter of 100 to 1000 μm, and 150 to 30 μm.
The range of 0 μm is more preferable.

With respect to the distance between the holes, for example, when the number of rows of holes is constant, if the number of holes is increased in order to improve the degassing property, it is necessary to reduce the distance.
If the interval is too small, the strength of the packaging bag will decrease. Also, if the spacing is increased, there is no problem in terms of strength, but the number of holes will decrease, and in order to obtain the necessary degassing property,
If it becomes necessary to increase the diameter of the pores, and if the pore diameter is too large (greater than 1000 μm), there is a problem of invasion of harmful insects as described above. Therefore, it is preferable to adjust the distance between the holes to a certain range, specifically, 5 mm to 10 m.
It is preferably in the range of m. If the distance between the holes is less than 5 mm, there is no problem in terms of strength up to a weight of 5 kg, but if the weight is 10 kg, the strength will be insufficient and the holes will be torn due to a drop impact, etc. Become.
Further, when the distance between the holes is more than 10 mm, the number of holes per one bag becomes small, and holes having a hole diameter of 1000 μm or more are required, which is not preferable because it allows pests to enter. Note that the relationship between the hole spacing and the hole diameter may be within the range that satisfies the above conditions, and is not particularly limited.

The method of providing the above-mentioned holes in the packaging bag is as follows.
When the hole diameter is as large as 1 to 2 mm as in the conventional product, it can be opened by a method by ordinary punching, but when the hole diameter is as small as 100 to 1000 μm as in the present invention, a method using a heating needle or the like, or A method using laser light irradiation can be preferably applied.

The laser irradiation of the pulse oscillation type is used for perforating the laminated film with the above laser beam, but if the laser is capable of on / off control on the order of microseconds, it will be intermittent in the form of spots, notches, etc. Drilling is possible. A carbon dioxide gas laser, a YAG laser, a semiconductor laser, an argon ion laser, or the like can be used as the type of laser, and there is no particular limitation, but in order to make a hole in the film, the film absorbs the laser oscillation wavelength and generates heat. However, it is necessary to form a mist, and from this point, a carbon dioxide gas laser can be particularly preferably used.

The wavelength of carbon dioxide laser light 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.
A low-density polyethylene film cannot be perforated because it is hardly absorbed and penetrates. However, when low-density polyethylene is laminated with a film that absorbs carbon dioxide gas laser light as described above and is used as a laminated film, the carbon dioxide laser light should be output adjusted and irradiated on the laminated film. As a result, the layer that absorbs this heat is generated, and the heat can simultaneously open the low density polyethylene layer. Also in the packaging bag for rice grains of the present invention, the laminated film is used, the sealant layer is low-density polyethylene, nylon is used for the surface layer and the intermediate layer,
Since a material that absorbs carbon dioxide laser light, such as polyethylene terephthalate, is used, the holes can be opened without problems. By using such a laser beam as a means for making holes, even small holes having a diameter of several tens of μm to 1,000 μm can be stably opened with high productivity, and the hole diameter and the hole spacing can be improved. Can be easily changed.

[0020]

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 examples. FIG. 1 is a diagram illustrating a perforable region for deaeration in the rice grain packaging bag of the present invention. FIG. 2 shows, in the packaging bag for rice grains of the present invention,
It is a schematic cross section explaining the detail of the width direction of the perforation possible region near the back seal part. (It shows a state in which the packaging bag is filled with the contents and then stacked in two layers.) First, the packaging bag 10 for rice grains shown in FIG. 1 is a pillow type packaging bag used for filling, packaging, and distributing rice and the like. In general, a roll-shaped laminated film is drawn out, and a plurality of holes for degassing are formed in the perforable regions 3a, 3b, 4a, 4b by drawing a heating needle or laser light.
A hole diameter of 100 to 1000 μm is provided in at least one position in 5a and 6a (however, 5a and 6a are also common to the opposite surface of the bag) and at least one position in the perforable region 7.
After the holes are provided in a row of holes in the flow direction or width direction of the laminated film under the condition that the distance between the holes is 5 to 10 mm, the bag has a predetermined width on both the left and right sides with the sealant layer of the laminated film as the inside. So that the back seal portion 1 is formed into a tubular body by heat-bonding the both ends at a substantially central portion in a palm-and-stick manner, and further, the back seal portion 1 is laid down to be in a flat state. The bottom seal portion 2 is heat-bonded and formed at a predetermined pitch, and the portion immediately behind the bottom seal portion 2 is cut to form individual packaging bags. The details of the width of the perforable area 7 are shown in FIG.

FIG. 2 is a packaging bag for rice grains shown in FIG.
This is shown for explaining the widthwise details of the perforable area 7 near the spine seal portion 10 and the state in which the packaging bag of FIG. 1 is filled with contents such as rice and stacked in two stages. It is a schematic cross-sectional view showing. In FIG. 2, voids 8a and 8b are formed on both sides of the back seal portion 1a of the stacked packaging bags due to the difference (step) in the thickness of the laminated films, and also under the lying back seal portion 1a. A void 8c is formed by the bending resistance of the laminated film with a constant width in the direction in which the back seal portion 1a is laid down. Then, the voids 8a, 8
b) When the deaeration holes are provided in each area of the packaging bag facing the 8c, the deaeration of the packaging bag is hindered because each void serves as an air passage for the deaerated air. Never. Therefore, areas having widths of about 5 to 6 mm from both ends of the back seal portion 1a can be used as the perforable areas 7a and 7b, respectively, and the back seal portion 1a can be used.
An area having a width of about 5 to 6 mm in the direction in which the back seal portion 1a is laid down from the root thereof can be used as the perforable area 7c.

The present invention will be specifically described below with reference to examples. (Example 1) Pillow-type packaging bag for filling and packaging 10 kg of rice (width 340 mm, length 570 mm, back seal width 10)
mm) with a laminated film, a biaxially stretched nylon film (ON) having a thickness of 15 μm is used for the outer layer of the laminated film, and a thickness of 60 is used for the inner layer (sealant layer).
Using a linear low-density polyethylene (LLDPE) film having a thickness of μm, a two-component reactive urethane-based adhesive was used to bond the two by a known dry lamination method.
A wound laminated film having a width of 00 mm was prepared. Next, in order to provide a plurality of holes (opening row) for deaeration in this laminated film, a carbon dioxide gas laser was used to make a position corresponding to 25 mm from each of the left and right ends of the surface of the packaging bag on the side without the back seal. In the vertical direction, with a pore size of 300 μm × 150 μm
(Vertical elliptical) holes are arranged with a hole interval of 7.5 mm to form a total of 2 rows of holes on the left and right sides, and further, from both ends of the laid back seal part to both sides of the bag. 2m
At the position corresponding to m, the hole diameter 30
Holes having a size of 0 μm × 150 μm (vertical ellipse) were formed with a hole interval of 7.
After forming one row of holes each having a hole of 5 mm (two rows in total), this laminated film was folded at a diameter (bag width) of 340 mm,
Back seal width 10 mm, bottom seal width 10 mm, total bag length 5
The packaging bag for rice grains of Example 1 was prepared by bag-making to 70 mm. (The distance between the two rows of left and right rows of the back seal portion is approximately 14 mm.)

(Example 2) In the construction of the packaging bag for rice grains of Example 1, the row of holes provided on both sides of the lying back seal portion was separated from both ends of the back seal portion by 3.5 mm outside. All were processed in the same manner as in Example 1 except that the bag was changed to the position and the packaging bag for rice grains of Example 2 was prepared. (The space between the left and right rows of the back seal is approximately 17
mm. )

(Embodiment 3) In the construction of the packaging bag for rice grains of Embodiment 1, the row of holes provided on both sides of the laid back seal portion is located at a position 5 mm outside from both ends of the back seal portion. Example 1 except that it was modified so that
A rice bag packaging bag of Example 3 was prepared by processing in the same manner as in. (The space between the left and right rows of the back seal is about 20m.
m. )

(Comparative Example 1) In the structure of the packaging bag for rice grains of Example 1, the openings of the row of holes provided on both the left and right sides of the back seal portion were stopped, and the row of holes was provided on both sides of the packaging bag, respectively. A packaging bag for rice grains of Comparative Example 1 was prepared in the same manner as in Example 1, except that each row was arranged at a position 10 mm from the left and right ends (4 rows in total).

(Comparative Example 2) In the configuration of the packaging bag for rice grains of Example 1, the openings of the row of holes provided on both the left and right sides of the back seal portion were stopped, and the row of holes was provided on both sides of the packaging bag, respectively. The rice grain packaging bag of Comparative Example 2 was prepared in the same manner as in Example 1, except that each row was provided at a position 15 mm from the left and right ends (4 rows in total).

(Comparative Example 3) In the structure of the packaging bag for rice grains of Example 1, the openings of the row of openings provided on the left and right sides of the back seal portion were stopped, and the row of openings was provided on both sides of the packaging bag, respectively. A rice grain packaging bag of Comparative Example 3 was prepared in the same manner as in Example 1 except that one row (four rows in total) was provided 30 mm from the ends on both the left and right sides.

(Reference Example) A commercially available conventional type rice bag for 10 kg, that is, a packaging bag is made of a laminated film having the same structure as in Example 1, and the bag has an outer dimension of 360 mm in width.
× It is a three-sided seal type packaging bag with a length of 570 mm and a sealing width of 10 mm, and the degassing holes are 40 mm inward from both ends of the bag excluding the seal margins.
A circular bag having a hole diameter of 2 mmφ was opened at a position of mm by a punching method at a hole diameter of 2 mmφ in a punching method to obtain a packaging bag for rice grains of Reference Example. This packaging bag has a row of apertures, one on each side of the film on both the left and right sides of the bag, and a total of four rows of apertures on the entire bag.
The number of holes per row is two, and the total number of bags is eight.

As described above, the diameter of the holes for deaeration provided in each of the packaging bags of Examples 1 to 3, Comparative Examples 1 to 3 and Reference Example, the distance between the holes, and the formed row of holes. Table 1 shows the number of rows, the positions of the rows, and the total number of holes per bag. (Below margin)

[0030]

[Table 1]

[Evaluation and Results] Each of the packaging bags of Examples 1 to 3, Comparative Examples 1 to 3 and Reference Example prepared as described above was used as a sample, and its deaeration and bag strength (after the contents were enclosed) The drop test of the packaging bag and the stacking test) and the insect invasion preventive property were evaluated, and the results are summarized in Table 2.

(1) Deaeration test Each packaging bag was filled with 12 L of air, and the time required for completely degassing with a load of 5 kg per unit (seconds)
Was measured. In addition, in addition, relative evaluation was performed using the reference example as a reference, and the following ranking was performed. (Evaluated by the average value of 10 samples each) (Symbol) (Evaluation criteria) ◎: Degassing faster than the packaging bag (58 seconds) of the reference example. ◯: Same as the packaging bag of the reference example (58 seconds) to +10 seconds (68 seconds in total). Δ: Packaging bag of Reference Example from +11 seconds (69 seconds in total) to +30 seconds (88 seconds in total). (Even at this level of packaging bag, there is no problem in practical use due to the fact that the bag does not break in the drop test and stacking test under normal conditions.) ×: Degassing was performed for 31 seconds or more from the packaging bag (58 seconds) of the reference example Slow (total of 89 seconds or more).

(2) Strength test of the packaging bag (b) Drop test 10 kg of rice was sequentially enclosed in each of 30 packaging bags of each sample, and from the height of 1.5 m, 5 times in the vertical direction and 5 times in the horizontal direction. The bag was dropped 5 times and 5 times in the side direction in order, and the number of bag breakages was examined. The results are shown in Table 2 as the number of bag breaks / 30. In addition, in order to make a difference between the example, the comparative example, and the reference example, this test intentionally applied a severe drop condition, and normally, in order to judge the practicality, a height of 1 was used.
The test was conducted under the conditions of m 3 times in the vertical direction, 3 times in the horizontal direction, and 3 times in the side direction. The packaging bags of the present example, the comparative example, and the reference example did not break in the drop test under these conditions, and there was no problem in terms of practicality.

(B) Stacking test 10 kg of rice was packed in each sample packaging bag, 10 pieces were stacked on a pallet, transported to a warehouse, stored for 3 days, taken out, and checked for the presence of broken bags. (Symbol) (Evaluation criteria) ○: No bag breakage. X: Something has a broken bag.

(3) Prevention of insect invasion Regarding the prevention of insect invasion, in the packaging bag provided with circular holes of 2 mmφ of the reference example, the number of holes is as small as 8, but a long-term test of one month or more. Is not preferable because insect invasion is recognized. On the other hand, in the packaging bags of Examples 1 to 3 and Comparative Examples 1 to 3, the number of holes is large, but the hole diameter itself is 100.
Since it was as small as 0 μm or less, invasion of insects was not observed and it was good. (Symbol) (Evaluation criteria) ○: Insects that do not enter. X: Infestation with insects. (Below margin)

[0036]

[Table 2] Evaluation results As is clear from the evaluation results shown in Table 2, Examples 1 to 1
The packaging bag of No. 3 did not break even under severe conditions such as this drop test, and was not inferior to the packaging bag of Reference Example, and when compared with the packaging bags of Comparative Examples 1 to 3, clearly There was a significant difference, and the strength was further improved.

[0037]

As described in detail above, according to the present invention, even if a plurality of holes for deaeration are provided in the packaging bag in a row of holes, the strength of the packaging bag is not impaired, and the packaging bag is excellent. Since deaeration can be maintained, excess air remaining in the bag is smoothly released to the outside even when the contents such as rice are enclosed and accumulated and piled up. No
Furthermore, the effect of easily providing a packaging bag for rice grains, which is excellent in the ability to prevent invasion of harmful insects, is exerted. Further, since the packaging bag is made of a laminated film of plastic, the holes for deaeration can be opened even by irradiation with laser light, and even if the hole diameter is a small hole of several 10 μm to 1000 μm, It is possible to open holes having a stable hole diameter at predetermined intervals with good productivity. Further, when using a laser beam, since it is easy to change the hole diameter and the hole interval, it is possible to easily accommodate packaging bags of different sizes, and it is possible to provide a highly efficient rice grain packaging bag with high productivity. .

[Brief description of drawings]

FIG. 1 is a diagram illustrating a perforable region for deaeration in a rice grain packaging bag of the present invention.

FIG. 2 is a schematic cross-sectional view illustrating details in the width direction of the perforable region near the spine seal portion in the rice grain packaging bag of the present invention. (Shown in a state where the contents are enclosed and then stacked in two stages.)

[Explanation of symbols]

1, 1a Back seal part 2 Bottom seal part 3a, 3b, 4a, 4b, 5a, 6a Punchable area 7, 7a, 7b, 7c Punchable area 8a, 8b, 8c Void area 10 , 20 Rice grain packaging bag

Claims (2)

[Claims] 1. A pillow type packaging bag formed by heat-bonding plastic laminated films, wherein the packaging bag has a hole diameter of 1
There is an opening row in which a plurality of holes of 0 to 1000 μm are opened at a predetermined interval, and the opening row is at least one position in the left and right regions along the root of the back seal portion of the packaging bag. Further, it is provided at least at one position in a region along the left and right or upper and lower ends of the packaging bag which are not blocked by the packaging bag when the packaging bags after enclosing rice grains are stacked. A packaging bag for rice grains characterized by the above. 2. The holes of the opening row provided in the packaging bag,
The packaging bag for rice grains according to claim 1, wherein the packaging bag is a hole opened by irradiation with laser light.