JPH1179200A - Rice packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve unsealability of a packaging bag by heat-bonding a plastic film into a bag and sticking a plastic base material having a plurality of fine holes having a specific hole diameter to an opening of the bag. SOLUTION: A plastic film 1 constituting the rice packaging bag comprises a plastic film 1' of the same material as that of the plastic film 1 at an upper end of a heat-sealable face H1 where a plastic base material 3 formed with fine holes 2 having an average hole diameter ranging from 100 to 1000 μm is provided by radiating pulse oscillation type laser to the film 1'. That is, the plastic base material 3 is stuck by overlaying an end of its heat-sealable face H2 on the upper end of the face H1 and heat-sealing 4 the overlapping parts. A plastic film 1a with such a plastic base material 3 having fine holes 2 stuck is prepared into a bag, and after rice or the like is filled, an opening is heat-sealed 8 to complete a product.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging bag for rice grains, and more particularly, to releasing excess air remaining in the packaging bag when rice grains are packed and packed for storage and distribution. The present invention relates to a packaging bag for rice cereals, which prevents breakage of the bag and further has an easy opening property.

[0002]

2. Description of the Related Art Conventionally, various types of packaging bags have been developed and proposed as packaging bags for filling and storing rice grains for storage and distribution. 2. Description of the Related Art A plastic packaging bag manufactured by using a film or a multilayer laminated film and thermally bonding the film to a bag is used. As the plastic film constituting the above-mentioned packaging bag, for example, a single-layer film made of a linear low-density polyethylene film, or a biaxially stretched nylon film / aluminum-deposited polyethylene terephthalate film / linear film A multilayer laminated film composed of a low density polyethylene film or a multilayer laminated film composed of a biaxially stretched nylon film / linear low density polyethylene film is used. As a method of filling and packaging rice grains in a packaging bag formed by using a single-layer film or a multilayer laminated film as described above, a vertical-type filling and packaging machine is usually used to fill rice grains. Later, when the opening is top sealed, a jig such as sponge rubber is mechanically pressed from both sides to remove air existing in the space formed in the head space as much as possible. The air packaging method is adopted.

[0003]

However, in the above-described rice cereal filling and packaging method, when the filled and wrapped products are accumulated and stacked in storage and distribution, the content of rice cereal is weight. Since it is a product, a large load is applied to the lower packaged product, and it is difficult to sufficiently deaerate the air by the above-described deaeration method. As a result, air remains in the packaging bag, and There is a problem that the internal pressure rises due to the remaining air and a phenomenon such as breakage of the packaging bag occurs. For this reason, in order to allow the remaining excess air to escape, the plastic film forming the packaging bag is required to have a hole diameter of 1 mm.
A hole of about 2 mm or a notch of about 2 mm in length is appropriately engraved, or, when the packaging bag is a pillow-type packaging bag, a non-woven fabric is formed on a part of the back seal portion. A gas permeable tape or the like is bonded to achieve deaeration or the like. However, when the plastic film constituting the packaging bag is provided with a hole having a hole diameter of about 1 to 2 mm, the hole is large enough to allow excess air in the packaging bag to escape, and is opened per bag. The number of holes may be small, and the decrease in strength of the packaging bag does not pose a problem.However, in the case of a hole having a hole diameter of about 1 to 2 mm, pests such as black elephants and black elephants enter from the opening, and the contents are not changed. There is a problem that some rice grains are eaten. Further, when the plastic film constituting the packaging bag is provided with a cut having a length of about 2 mm, the packaging bag is torn from the cutout, the cut is enlarged, and pests and the like enter as described above, and the harm is caused. In addition, there is a problem that the packaging bag itself breaks. Furthermore, in the case of a pillow-shaped packaging bag in which a breathable tape such as a nonwoven fabric is stuck to a part of the back seal portion, ordinary degassing performance is sufficiently excellent, and furthermore,
Even if the contents are actually filled and packed, and the packaged products are accumulated and stacked, the degassing performance of the air remaining in the packaging bag does not decrease, but the plastic film forming the packaging bag Since a different kind of member such as a nonwoven fabric is bonded with a breathable tape or the like, the number of members constituting the packaging bag is increased, and the degree of processing such as bonding is also increased, thereby significantly increasing the cost of the packaging bag. There is a problem. Next, as a plastic film constituting a packaging bag for rice cereals, a film of polyethylene resin having poor tearability is generally used as a main base material. There is a problem that it is inferior and cannot be easily and easily opened. Therefore, the present invention provides excellent deaeration performance even when stacking packaged products in storage and distribution, and the like, without lowering the strength thereof, and without phenomena such as bag breakage, and further, without invasion of pests and the like. It is still another object of the present invention to provide a rice cereal packaging bag which is excellent in opening property when taking out the contents.

[0004]

Means for Solving the Problems The present inventor has made various studies to improve the above-mentioned problems, and as a result, manufactured a packaging bag for rice cereals by heat-bonding a plastic film to form a bag. In doing so, a plastic film of the same material as the plastic film constituting the above-mentioned rice cereal packaging bag is separately used for a part of the plastic film constituting the packaging bag, and this is irradiated with a pulse oscillation type laser. Then, a fine opening having an average pore diameter of 100 μm to 1000 μm is formed, and the plastic substrate having the fine opening is bonded, and the plastic substrate is bonded to the plastic substrate. Using a film to make a bag to produce a packaging bag, filling the rice bag in the packaging bag to produce a packaging product, even if the packaging product is stacked in storage, distribution, etc., Excellent deaeration performance, and no decrease in the strength of the packaging bag is observed, and there is no phenomenon such as breakage of the packaging bag, furthermore, there is no invasion of pests and the like from the fine opening, furthermore, When taking out the contents, they found that the above-mentioned fine opening functions as an opening property of the packaging bag, and can manufacture a packaging bag for rice cereals that can be easily and easily opened. Thus, the present invention has been completed.

[0005] That is, the present invention relates to a packaging bag formed by forming a plastic film into a bag by heat bonding.
A part of the plastic film constituting the packaging bag is opened, and a plastic substrate having a plurality of fine openings having a deaeration function having a hole diameter of 100 to 1000 μm is adhered to the opening. The present invention relates to a rice cereal packaging bag.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail below. The configuration of the rice cereal packaging bag according to the present invention will be described with reference to the drawings by exemplifying 12 examples. FIG. 1 shows that the plastic substrate constituting the rice cereal packaging bag according to the present invention is adhered. FIG. 2 is a schematic plan view showing the configuration of the plastic film, and FIG. 2 is a schematic YY ′ of the plastic film to which the plastic substrate constituting the packaging bag for rice cereals according to the present invention shown in FIG. FIG. 3 is a cross-sectional view, and FIG. 3 is a packaging bag for rice cereal according to the present invention manufactured by using a plastic film to which a plastic substrate constituting the packaging bag for rice cereal according to the present invention shown in FIG. FIG. 4 is a schematic plan view showing the configuration of a packaged product in which rice cereals are filled and packed in the rice cereal packaging bag shown in FIG. 3, and FIG.
FIG. 2 is a schematic perspective view showing a configuration of a rice cereal packaging bag according to another embodiment of the rice cereal packaging bag according to the present invention.

An example of the rice cereal packaging bag according to the present invention will be exemplified. First, in the present invention, a plastic film constituting the rice cereal packaging bag according to the present invention will be described with reference to FIGS. 1 and 2. As described above, the plastic film 1 constituting the packaging bag for rice cereal is provided with a cover.
City - the upper end portion Le of the surface H _1, using a different plastic film 1 'of the same material as the plastic film 1, to which pulsed les - by irradiating The average pore size of 1
Fine opening 2 in the range of 00 μm to 1000 μm
Tosi - - heat of forming a plastic substrate 3 to form the fine aperture 2 (1 ') superposed end Le of the plane H _2, thereafter the polymerization unit arsenide - city - To form a seal portion 4, and the plastic film 1 and the plastic substrate 3 (1 ′) having fine openings 2 are bonded together to form a packaging bag for rice grains according to the present invention. A plastic film 1a to which a plastic base material 3 having a fine opening 2 to be constituted is adhered is manufactured.

In the present invention, as shown in FIG. 3, a plastic film 1a to which a plastic substrate 3 (1 ') having the fine opening 2 is bonded is used. It is rolled, one end and the other end are overlapped, and then the overlapped portion is heat-sealed to form a vertical seal portion 5, and the bottom overlapped portion is further sealed.
A part of the upper portion of the plastic film 1a constituting the bag is opened by sealing and forming the bottom seal portion 6 to form a bag, and the opening has a hole diameter of 100 to 1000 μm.
The plastic bag 3 for rice cereal according to the present invention, in which a plastic substrate 3 (1 ') having a plurality of fine openings 2 having deaeration and easy-opening properties in the range of m is adhered to the upper part of the bag. Can be manufactured. In FIG. 3 above, 1, 1 ',
Reference numerals 1a, 2, 3 (1 '), 4 and the like have the same meanings as shown in FIGS.

Next, in the present invention, the packaging bag A for rice cereal according to the present invention as described above, as shown in FIG.
A predetermined amount of rice grains (contents) 7 is filled from the opening,
Then, the opening is heat-sealed to form an upper seal portion 8 to produce a packaged product B filled and packed with rice grains (contents) 7 and distributed in the form of the packaged product B. It is provided for storage and the like. In FIG. 4, 1, 1 ', 1
Reference numerals a, 2, 3 (1 '), 4, 5, 6, etc. have the same meanings as those shown in FIGS. 1, 2 and 3 described above. In the packaged product B as described above, the fine openings 2 of the plastic base material 3 (1 ') having the fine openings 2 play a deaeration function to prevent bag breakage and the like. At the time of opening, when the packaging bag is torn by holding the portion of the plastic base material 3 (1 ') having the fine opening 2 in hand, the fine opening 2 has an effect of easy opening. By playing, the packaging bag can be easily torn, and the rice grains (contents) 7 can be easily taken out and used for the purpose.

Next, as another example of the packaging bag for rice according to the present invention, as shown in FIG.
Similar to the above exemplified, firstly, heat of the plastic film 1 constituting the rice cereal packaging bag - city - the lateral end portion Le of the surface H _1, another plastic film 1 of the same material as the plastic film 1 ′ Is irradiated with a pulse oscillation type laser to form a fine opening 2 having an average hole diameter in the range of 100 μm to 1000 μm, and a plastic in which another fine opening 2 is formed. Heat of base material 3 (1 ')
Toshi - superimposing the ends of the Le of surface H _2, thereafter the polymerization unit arsenide - city - Le to sheet - form the pole tip 4, having the plastic film 1 and the fine apertures 2 A plastic film 1a to which a plastic substrate 3 having fine openings 2 constituting a packaging bag for rice cereal according to the present invention is attached by bonding both of the plastic substrates 3 (1 '), Next, a plastic film 1a to which a plastic base material 3 (1 ') having the fine apertures 2 is attached is used, and this is rolled, and the end of one plastic base material 3 (1') is cut. And the end of the other plastic film 1 are overlapped, and then the overlapped portion is heat-sealed to form a vertical seal portion 5, and the bottom overlapped portion is heat-sealed. To form a bag with the bottom seal 6 Some of the vertical portion of the plastic film 1a constituting the bag body is opened, the opening, pore size 10
A plastic substrate 3 having a plurality of fine openings 2 having a deaeration property and an easy opening property in the range of 0 to 1000 μm.
Another form of the rice cereal packaging bag C according to the present invention, in which (1 ′) is stuck to the vertical portion, can be manufactured. In FIG. 3, the reference numerals 1, 1 ', 1a, 2, 3 (1'), 4, etc. have the same meanings as those shown in FIGS.

[0011] In the rice cereal packaging bag according to the present invention as described above, usually, when packaging products filled with rice cereal (contents) are stacked in storage and distribution, the vertical seal portion, bottom, In the seal part or upper seal part, etc.
Since it mainly has a deaeration effect, it is desirable that a fine opening is formed in the vicinity of each seal portion. If a fine opening is formed in the vicinity of the portion, not only does this portion have a deaeration effect, but also when the portion is opened by holding it in a hand, This has the effect of opening easily.

The above examples are a few examples of the packaging bag for rice cereals according to the present invention, and the present invention is not limited thereto. For example, as a form of the packaging bag, although not shown, it is possible to take various packaging forms such as a pillow-wrapping form, a caset-type packaging form, a self-supporting packaging form, and the like.

Next, in the present invention, the material constituting the rice cereal packaging bag according to the present invention and the method of producing the same will be described. First, as the plastic film constituting the rice cereal packaging bag according to the present invention, When making a bag, the heat is used to make the bag using heat-sealing properties.
It is possible to use a resin film having the property of being fused by heat and capable of being thermally fused to each other. Specific examples of the resin film having the above characteristics include low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear low-density polyethylene, polypropylene, ethylene-propylene copolymer, and ethylene-acetic acid. Vinyl copolymer, ionomer resin, ethylene-ethyl acrylate copolymer, ethylene-acrylic acid or methacrylic acid copolymer, methylpentene polymer, polybutene resin, polyvinyl chloride resin, polyvinyl acetate resin, Polyvinylidene chloride resin, vinyl chloride-vinylidene chloride copolymer, poly (meth) acrylic resin, polyacrylonitrile resin, polystyrene resin, acrylonitrile-styrene copolymer (AS resin), acrylonitrile-butadiene-styrene Copolymer (ABS resin) Polyester resins, polyamide resins, polycarbonate - Bonnet - DOO resins, polyvinyl alcohol - Le resins, ethylene - saponified vinyl acetate copolymer, fluorine resin,
It can be arbitrarily selected from known resin films or sheets such as diene resins, polyacetal resins, polyurethane resins, nitrocellulose and others. In the present invention, the above-mentioned resin film or sheet may be used in an unstretched state or in a uniaxially or biaxially stretched state. The thickness is arbitrary, but several μm to 3 μm.
Range of about 00 μm, preferably 15 μm to 200 μm
It can be used by selecting from the positions.

By the way, in the present invention, among the resin films or sheets as described above, the resin film or sheet itself is used as a heat sink.
When it has thermal adhesiveness such as sealability, it can be used as a single film or sheet, and when it does not itself have thermal adhesiveness such as heat sealability. Is
It can be used by laminating it with a resin film or sheet having heat adhesive properties such as heat sealability. In the present invention, for example, polyester resin, polyamide resin, polyaramid resin, polyethylene resin, polypropylene resin, polycarbonate resin, acrylic resin, polyacetal resin, fluorine resin, Other tough resin films or sheets, for example,
Low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, ethylene-ethyl acrylate copolymer, ethylene -Laminating films or sheets of methacrylic acid copolymer, ethylene-propylene copolymer, methylpentene polymer, polybutene polymer, acid-modified polyolefin resin, and other resins that can be melted and fused to each other by heat. It is preferable to use them. In the above, the thickness of the laminated film is from several μm to 300 μm.
It can be selected from about μm, preferably about 15 μm to 200 μm.

According to the present invention, the plastic film constituting the packaging bag for rice cereals according to the present invention may be, for example, a straight-chain low-molecular-weight film from the viewpoints of bag-making conditions, production cost, and other factors. Single-layer film consisting of high-density polyethylene film, or multilayer laminated film consisting of biaxially stretched nylon film / adhesive layer / linear low-density polyethylene film, linear low-density polyethylene film / adhesive layer / biaxially stretched nylon Film / adhesive layer /
Multi-layer laminated film composed of linear low-density polyethylene film, biaxially oriented polyethylene terephthalate film / adhesive layer / multi-layer laminated film composed of linear low-density polyethylene film, linear low-density polyethylene film / adhesive layer / Biaxially oriented polyethylene terephthalate film / adhesive layer / multilayer laminated film consisting of linear low-density polyethylene film, biaxially oriented nylon film / adhesive layer / aluminum-deposited biaxially oriented polyethylene terephthalate film / adhesive A multilayer laminated film composed of a layer / linear low-density polyethylene film is used. In the above, as a method for producing a multilayer laminated film, for example, a dry laminating method of laminating using an adhesive or the like, an extruding laminating method of extruding and laminating an adhesive resin, or an adhesive method Examples thereof include an extrusion coating method for extruding and coating a resin, a multilayer extrusion lamination method for extruding and laminating all layers in multiple layers, a single-layer or multilayer inflation method, and other methods.

Next, in the present invention, a pore size of 100 to
As the plastic base material having a plurality of fine openings having a deaeration property and an easy-opening property in the range of 1000 μm, the above-mentioned plastic film constituting the rice cereal packaging bag according to the present invention may be similarly used. Can be. Thus, in the present invention, the plastic film constituting a plastic substrate having a plurality of fine openings having a deaeration property and an easy-opening property having a pore diameter in the range of 100 to 1000 μm according to the above-mentioned invention is described. When pasting with the plastic film that constitutes the rice cereal packaging bag,
Alternatively, a resin film having a property of being melted by heat and being mutually heat-sealed is used since the heat-sealing or the like is used for heat-sealing or the like to make the bag-bonding or bag-making. Further, since a fine aperture is provided by irradiation with a pulse oscillation type laser, a resin film having a property of absorbing a laser oscillation wavelength is desirable. In particular, in the present invention, a pore size of 100 to 10
As a plastic film constituting a plastic substrate having a plurality of fine openings having a deaeration property and an easy-opening property in the range of 00 μm, both sides are melted by heat when they are bonded or made into a bag. It is desirable to be formed of a resin film having a property capable of being thermally fused to the resin. Further, in the present invention, the plastic film constituting the plastic base material having fine openings and the plastic film constituting the packaging bag for rice cereals according to the present invention are formed by heat sealing or the like. From the viewpoint of heat bonding or bag making, it is desirable to use the same material for both. Of course, in the present invention, a combination of different materials can be used.

Incidentally, the above-mentioned pore diameter of 100 to 1000 μm
In a plastic substrate having a plurality of fine openings having deaeration and easy-opening properties in the range of m, an effect of deaeration, easy-opening, and the like is obtained.
It is preferable to have a fine opening having a range of μm to 1000 μm. In the above description, the fine pores are preferably as small as possible, and the pore size is more preferably 1 μm.
About 50 μm to 400 μm is desirable. In the above description, the interval between the holes in the fine opening varies depending on the specification of the plastic film, the weight of rice grains (contents) to be filled, and the like. .
It is desirable that fine openings are formed at intervals of about 5 mm to 7 mm, preferably about 2 to 5 mm. Thus, in the present invention, the diameter of the fine opening, the distance between the holes, and the like prevent the invasion of pests such as black elephants and black elephants into the packaging bag, and fill and pack rice grains (contents). When stacking packaged products, it can be quickly degassed to the extent that the bag does not break due to the internal pressure of the air remaining in the packaging bag,
Further, by forming the fine opening, the condition such as the strength of the plastic film constituting the packaging bag does not decrease and the condition that the easy opening property can be imparted at the time of opening the packaging bag. It is desirable that the decision be made in consideration of satisfaction.

In the present invention, the fine opening has a hole diameter of 1
If it is less than 00 μm, the amount of deaeration per hole is small and a large number of holes are required per packaging bag. In such a case, in order to deaerate, it is necessary to reduce the distance between the holes. There is, and if it does so, it will cause the fall of the intensity | strength of a packaging bag, and it is unpreferable. Further, in the present invention, if the pore size of the fine opening is 1000 μm or more, it is a size capable of invading pests such as black elephants and black elephants into the packaging bag, which causes food damage and the like. It is undesirable.

Next, in the present invention, when the interval between the holes of the fine opening portion is less than 0.5 mm, regardless of the type of the plastic film constituting the packaging bag, it is easily opened. Although the property is good, it is not preferable because the strength of the processed portion of the plastic film constituting the packaging bag is insufficient and the bag may be easily broken. For example, a multilayer laminated film composed of the above-mentioned biaxially stretched nylon film / adhesive layer / aluminum-deposited polyethylene terephthalate film / adhesive layer / linear low-density polyethylene film, or biaxially stretched nylon film / adhesive layer When the stretchability is low, such as a multilayer laminated film made of a linear low-density polyethylene film, if the distance between the holes is larger than 1 mm, the easy-opening property is impaired. Like a multilayer film consisting of a polyethylene film / adhesive layer / linear low-density polyethylene film, if the film is highly extensible, if the distance between the holes is in the range of 0.5 mm to 5 mm, Degassing, easy opening, without impairing the drop strength of the packaging bag, etc. Therefore, if the distance between the holes is larger than 5 mm,
The easy opening property may be impaired.
Further, when the content is rice, the packaging weight of rice is sold in various filling amounts such as several hundred grams to 10 kilograms. In such a case, the above-mentioned biaxially stretched nylon film / adhesive layer / aluminum vapor deposition Such as a multilayer laminated film composed of polyethylene terephthalate film / adhesive layer / linear low density polyethylene film, or a multilayer laminated film composed of biaxially stretched nylon film / adhesive layer / linear low density polyethylene film On the other hand, when the extensibility is low, when weighing 5 kg to 10 kg is caused by a fine opening at the time of falling,
Since there is a risk of breaking the bag, such as a simple film composed of a linear low-density polyethylene film, or a multilayer laminated film composed of a linear low-density polyethylene film / adhesive layer / linear low-density polyethylene film, It is desirable to use a material having high extensibility. Further, in the present invention, when the distance between the holes of the fine opening portion is 7 mm or more, it is possible to have the strength and the like of the packaging bag. It is not desirable because it becomes difficult to exhibit the effects such as the above.

In the present invention, as a method of forming the above-mentioned fine holes in the plastic film, for example, there is a method of forming the fine holes by using a heating needle or the like. However, it is not a preferable method because it is difficult to form micropores by stabilizing the dimensions because the pore diameter is small. In the present invention, a method of irradiating a plastic film with a pulse oscillation type laser to form micropores is preferable. According to this method, on / off control can be performed in a microsecond order, and a perforated shape can be obtained. Intermittently, a diameter of 100 μm or more and a diameter of 1000
It is possible to open fine openings up to μm with stable dimensions and high productivity. For this reason, in the present invention,
It is preferable to form a fine opening by irradiating a pulse oscillation type laser to open the fine holes. In the above, the types of lasers include a carbonate laser and a yttrium aluminum garnet (Yttrium).
Aluminum Garnet YAG) lasers, semiconductor lasers, argon ion lasers, and the like can be used, and are not particularly limited. But,
In the present invention, in order to form micropores, it is desirable that the plastic film constituting the packaging bag for rice cereal according to the present invention has absorption of laser oscillation. It is preferable that the plastic film in that case is, in particular, polyethylene terephthalate.
Film, nylon film, polypropylene film, polyethylene film and the like are preferred. In the present invention, the plastic film constituting the packaging bag for rice grains according to the present invention as described above, micropores are formed, the pore diameter, the gap between the holes, etc., the deaeration of the packaging bag,
It adjusts the ease of opening, the strength of the packaging bag, and the like. In the present invention, in order to form a fine aperture, for example, a laser is irradiated to a plastic film composed of a single-layer film or a multilayer laminated film to form the fine aperture. Then, it is desirable to stick this to a plastic film constituting a packaging bag for rice cereals to make a bag. Of course, in the present invention, the laser is irradiated in any state, such as the state of the packaging bag after bag making, and further, the state of the packaged product filled with the contents, thereby forming a fine opening. May be. Further, in the present invention, the shape of the fine opening may be a circular hole, an elliptical hole, or the like, and the form thereof may be regular or irregular, or a perforated shape or the like. It may be formed in any form.

Next, in the present invention, a method of making a bag using a plastic film to which a plastic substrate having fine openings is bonded will be described. As such a method, there are various methods. According to the present invention, the plastic film as described above is used, the heat-sealing surfaces thereof are opposed to each other, and the peripheral end is heat-sealed to provide a seal portion. Can be manufactured. In the above, as the form of heat sealing the peripheral end, for example, side seal type, two-way seal type, three-way seal type, four-way seal type, envelope-attached seal type , Gassho pasted seal type (pyro-seale type),
Heat seal forms such as pleated seal type, flat bottom seal type, square bottom seal type, boat bottom seal type, etc. can be given. Packaging bags can be manufactured. In addition, for example, a self-supporting packaging bag (standing pouch) or the like can be manufactured. In the above, as a method of heat sealing, for example,
Roll, rotary roll seal, belt seal, impulse seal
It can be performed by a known method such as a seal, a high-frequency seal, an ultrasonic seal, or the like.

[0022]

The present invention will be described more specifically with reference to the following examples. Example Two sides of a biaxially stretched nylon film having a thickness of 15 μm
A liquid-curable polyurethane-based adhesive is coated, and then a linear low-density polyethylene film having a thickness of 30 μm is dry-laminated on both coating surfaces to form a multilayer laminate having the following layer structure. A film was produced. Thickness 3
0 μm linear low-density polyethylene film / adhesive layer / biaxially oriented nylon film with a thickness of 15 μm / adhesive layer / linear low-density polyethylene film with a thickness of 30 μm A tape-shaped plastic substrate is manufactured by cutting to a width of 25 mm, and then a pulse oscillation type carbon dioxide laser is applied to the plastic substrate.
The seal was irradiated to remove 15 mm from both ends as the seal width.
A tape-shaped plastic base material having perforated fine openings formed along the flow direction with a width of mm was manufactured. On the other hand. In the same manner as described above, a linear low-density polyethylene film having a thickness of 30 μm and a linear low-density polyethylene film having a thickness of 60 μm are dry-laminated using a two-component curing type polyurethane adhesive. A multilayer laminated film having the following layer constitution was produced. 30 μm thick linear low density polyethylene film / adhesive layer / thickness 60
μm linear low-density polyethylene film Next, at the end of the upper end of the multilayer laminated film produced above, the end of the tape-shaped plastic base material having the fine apertures produced above Were overlapped with a width of 5 mm with their linear low-density polyethylene films facing each other, and the polymerized portion was heat-sealed to produce a plastic film constituting a packaging bag for rice cereals. Next, using the plastic film produced above, it is rolled, one end and the other end are overlapped, and the polymerized portion is heat-sealed to form a vertical seal portion. Further, a heat seal was applied to the polymerized portion of the bottom portion to form a bottom seal portion, thereby producing a packaging bag having a width of 340 mm (width) × 570 mm. Next, using the packaging bag manufactured as described above, the packaging bag is filled with 10 kg of rice as a content, and then the opening is heat-sealed to form an upper end sealing portion. Each packaged product in the form shown in Table 1 below was manufactured.

[0023]

[Table 1]

Comparative Example Instead of the tape-shaped plastic base material before forming the fine apertures manufactured in the above-described embodiment, the end of the upper end of the multilayer laminated film manufactured in the above-described embodiment was used. A non-woven fabric is used, and the ends of the non-woven fabric are overlapped with a width of 5 mm with the linear low-density polyethylene film facing each other. A film was produced. Next, using the plastic film produced above, it is rolled, one end and the other end are overlapped, and the polymerized portion is heated.
A vertical seal portion is formed by sealing, and a bottom seal portion is formed by heat-sealing the overlapping portion of the bottom portion.
A packaging bag of 40 mm (width) x 570 mm was manufactured. Next, using the packaging bag manufactured as described above, the packaging bag is filled with 10 kg of rice as a content, and then the opening is heat-sealed to form an upper end sealing portion. A packaged product having the form shown in Table 2 below was produced.

[0025]

[Table 2]

EXPERIMENTAL EXAMPLES Next, the packaged products produced in the above Examples 1 to 4 and Comparative Example 1 were measured for deaeration, bag strength, and insect invasion prevention. In the above, the degassing property was evaluated by enclosing 12 L of air in each packaging bag, applying a load of 5 kg per piece, and measuring the time (seconds) for complete degassing.
The evaluation was made relative to that of Comparative Example 1. ：: Degassed earlier than that of Comparative Example 1 (41 seconds) ：: Equivalent to that of Comparative Example 1 (41 seconds) to 5 seconds (46)
): Degas by 6 seconds (47 seconds) to 15 seconds (56 seconds) from that of Comparative Example 1 (41 seconds) X: 16 seconds (41 seconds) than that of Comparative Example 1 (41 seconds) It takes more than 57 seconds) to indicate deaeration.

Next, in the above description, the strength of the bag
The packaged product was dropped on a pallet 10 times from a height of 100 cm in the vertical direction, and the presence or absence of breakage of the packaging bag was confirmed, and the drop strength was measured. In the evaluation: ○: No breakage ×: Indicates breakage. In addition, 10 packaged products were stacked on a pallet, transported to a warehouse in that state, and stored for 3 days. After that, the packaged products were taken out, and the presence or absence of breakage of the packaging bag was checked to confirm the strength. In the evaluation: ○: No breakage ×: Indicates breakage.

Furthermore, in the above, as for the insect invasion-preventing property, no insect invasion was observed in all the packaged products.

Table 3 below shows the results of the above experimental examples.
Shown in

[0030]

[Table 3]

As is clear from the above results, Example 1
Nos. 4 to 4 were excellent in deaeration, falling strength and insect invasion-preventing properties, and could be sufficiently used as packaging bags for rice cereals.

[0032]

As is apparent from the above description, the present invention relates to a method for manufacturing a packaging bag for rice cereals by heat-bonding a plastic film to form a bag, and the plastic film constituting the packaging bag. A part of a plastic film of the same material as the plastic film constituting the above-mentioned rice cereal packaging bag is used, and a pulse oscillation type laser is used.
And irradiating the plastic substrate to form a fine opening having an average pore diameter of 100 μm to 1000 μm, and bonding the plastic substrate having the fine opening formed therein, and then bonding the plastic substrate. A bag is manufactured by using the combined plastic film to produce a packaging bag, and rice grains are filled and packaged in the packaging bag to produce a packaging product. Excellent in air performance, no decrease in the strength of the packaging bag is observed, there is no phenomenon such as breakage of the packaging bag, and no pests or the like enter through the fine opening, and the content is further improved. When taking out an article, it is said that the above-mentioned fine opening functions as an opening property of the packaging bag, and it is possible to manufacture a packaging bag for rice cereal that can be easily and easily opened. Things.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing the configuration of a plastic film to which a plastic substrate constituting a packaging bag for rice cereals according to the present invention is adhered.

FIG. 2 is a schematic cross-sectional view taken along the line YY ′ of the plastic film to which the plastic substrate constituting the packaging bag for rice cereal according to the present invention shown in FIG. 1 is attached.

FIG. 3 is a schematic diagram showing the configuration of a rice cereal packaging bag according to the present invention manufactured by using a plastic film to which a plastic substrate constituting the rice cereal packaging bag according to the present invention shown in FIG. 1 is adhered; FIG.

4 is a schematic plan view showing a configuration of a packaged product in which rice grains are filled and packed in the rice bag shown in FIG. 3;

FIG. 5 is a schematic perspective view showing the configuration of a rice cereal packaging bag according to another embodiment of the rice cereal packaging bag according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 The plastic film which comprises the packaging bag for rice grains 1 'The other plastic film of the same material as the plastic film 1 2 Fine opening part 3 (1') The plastic base material in which the fine opening part 2 was formed 4 Sea 1a Plastic film with a plastic substrate 3 having fine openings 2 constituting the packaging bag for rice grains according to the present invention 5 Vertical seal portion 6 Bottom seal portion 7 Rice grains (contents) things) 8 upper sheet - le portion a present invention US cereal packaging bag according to B packaging products C rice cereal packaging bag for H ₁ arsenide another embodiment according to the present invention - city - Le of the surface H ₂ heat - tosylate -Surface

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI B65D 33/00 B65D 33/00 C 81/24 81/24 C 85/50 85/50 A

Claims (4)

[Claims] Claims: 1. A packaging bag made by heat-bonding a plastic film into a bag, wherein a part of the plastic film constituting the packaging bag is opened, and the opening has a hole diameter of 100 to 1000 μm. A packaging bag for rice cereals, wherein a plastic base material having a plurality of fine openings having a deaeration property and an easy opening property is adhered. 2. The method according to claim 1, wherein the plastic substrate has a hole interval of 0.5 to 0.5.
2. The packaging bag for rice cereals according to claim 1, having a fine opening having a range of 7 mm. 3. The packaging bag for rice grain according to claim 1, wherein the fine opening is formed by irradiation with a pulsed laser. 4. A plastic film constituting a packaging bag and a plastic substrate having fine openings are made of the same material.
A packaging bag for rice cereals as described in.