JP7308590B2 - Packaging film manufacturing method, packaging bag manufacturing method, packaging container manufacturing method, lid material manufacturing method, package manufacturing method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for manufacturing a packaging film, a method for manufacturing a packaging bag, a method for manufacturing a packaging container, a method for manufacturing a lid material, and a method for manufacturing a package.

Fruits and vegetables continue to breathe even after harvesting, and the more vigorously they breathe, the more likely they are to deteriorate. The respiration of fruits and vegetables is suppressed in moderately low-oxygen and high-carbon-dioxide environments compared to the atmosphere. When the fruits and vegetables are stored under such conditions, deterioration and ripening of the fruits and vegetables are suppressed.
In recent years, various reports have been made on techniques for preserving the freshness of harvested fruits and vegetables by using a technique called MA (Modified Atmosphere) packaging. Specifically, the technique called MA packaging adjusts the balance between the respiration rate of the fruits and vegetables wrapped in the packaging material and the gas transmission rate of the packaging material, resulting in a moderately low temperature suitable for preserving the fruits and vegetables compared to the atmosphere. It realizes oxygen and high carbon dioxide conditions (Patent Documents 1 to 3).

However, in the above-mentioned MA packaging, when fruits and vegetables are wrapped in a film made of a material such as polypropylene or polyethylene, which is usually used for packaging fruits and vegetables, oxygen in the package is insufficient due to insufficient gas transmission rate of the film. Fruits and vegetables perform abnormal respiration, and as a result, the problem of accelerated deterioration and wilting of the fruits and vegetables may occur. As a method for solving such problems, a method of packaging fruits and vegetables using a perforated film having a plurality of fine through-holes provided on the film surface has been proposed (Patent Documents 1 and 2).

JP-A-2-85181 JP-A-9-252718 JP 2007-186248 A

However, the inventor of the present invention has found that the method for maintaining the freshness of foods such as fruits and vegetables using the conventional perforated film packaging bag described in Patent Documents 4 and 5 has the following problems. rice field.
Specifically, the present inventors have found that when a packaging bag made of a conventional perforated film is used to maintain the freshness of fruits and vegetables, the degree of deterioration of the preserved fruits and vegetables may vary. Therefore, the present inventors have made intensive studies on factors that cause variation in the degree of deterioration of fruits and vegetables when using packaging bags made of conventional perforated films. We found that the shape may have changed compared to before storage.

Therefore, the present invention is capable of stably maintaining the freshness of foods such as fruits and vegetables for a long period of time by molding them into packaging bags, packaging containers, and lid materials, and has excellent durability and stability during use. Technology for making packaging films is provided.

According to the present invention, a step of preparing a resin film;
A step of drilling through holes in the resin film by irradiating the resin film with a laser irradiation device;
including
In the step of forming the through-holes, the laser irradiation device is rotated in the width direction of the resin film perpendicular to the feeding direction of the resin film so that the incident angle of the laser light with respect to the surface of the resin film varies. A method for manufacturing a packaging film is provided, in which the through holes are punched while being swung and rotated.

Further, according to the present invention, there is provided a method for manufacturing a packaging bag using the packaging film obtained by the method for manufacturing the packaging film,
A method for manufacturing a packaging bag is provided, which includes a step of heat-sealing the packaging film having two or more through-holes in the feeding direction so as to leave one side of the packaging film as an opening.

Furthermore, according to the present invention, there is provided a method for manufacturing a packaging container using the packaging film obtained by the method for manufacturing the packaging film,
A method for manufacturing a packaging container is provided, which includes the step of forming the packaging film provided with two or more through-holes.

Also, a method for producing a lid material using the packaging film obtained by the method for producing the packaging film,
including a step of forming the packaging film provided with two or more of the through-holes;
A method for manufacturing a lid material is provided, wherein the lid material is used to seal a packaging container.

Furthermore, according to the present invention, there is provided a method for manufacturing a package, which includes a step of housing food in a packaging bag obtained by the method for manufacturing a packaging bag or a packaging container obtained by the method for manufacturing a packaging container. is provided.

According to the present invention, it is possible to stably maintain the freshness of foods such as fruits and vegetables for a long period of time by molding them into packaging bags, packaging containers, and lid materials, and has excellent durability and stability during use. Techniques for making packaging films are provided.

It is sectional drawing of the manufacturing apparatus for demonstrating the manufacturing method of the packaging film which concerns on this embodiment. FIG. 2 is an enlarged cross-sectional view of a main part of a manufacturing apparatus for explaining the method of manufacturing the packaging film according to the present embodiment; It is a figure for demonstrating the manufacturing method of the packaging film which concerns on this embodiment.

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In addition, in all the drawings, the same constituent elements are denoted by the same reference numerals, and the description thereof will be omitted as appropriate.

<Method for manufacturing packaging film>
The method for producing a packaging film according to the present embodiment (hereinafter also referred to as the present production method) includes a step of preparing a resin film and a step of drilling through holes in the resin film by irradiating the resin film with a laser using a laser irradiation device. and including. In particular, in the step of drilling the through-holes, the present manufacturing method is such that the laser beam is irradiated in the width direction of the resin film perpendicular to the feeding direction of the resin film so that the incident angle of the laser beam with respect to the surface of the resin film is varied. It is characterized by drilling through holes while rotating the device. By molding this packaging film, it is possible to stably maintain the freshness of foods such as fruits and vegetables, perishables, and processed foods for a long period of time. , the lid can be made.

Here, no technique has been reported so far that focuses on controlling the incident angle of the laser that irradiates the resin film when producing a packaging bag that can be used for MA packaging. In particular, as a method of punching through holes in a resin film used to produce a packaging bag that can be used for MA packaging, the methods that have been reported so far include a method using a needle and a method of punching holes. As for the method using a laser irradiation device, there was only a method of perforating by irradiating a laser only from a direction perpendicular to the surface of the resin film. Therefore, the shape of the through-holes provided in the conventional perforated film is almost always an elliptical shape having a major axis in a direction parallel to the feeding direction (longitudinal direction) of the resin film, or a substantially circular shape. . In addition, some conventional perforated films have a long diameter in the width direction (lateral direction) of the resin film perpendicular to the feeding direction of the resin film. A good and stable production method has not been reported.

The present manufacturing method will be described in detail below.

In this production method, first, a resin film necessary for producing the packaging film is prepared. The resin material constituting the resin film is not particularly limited as long as it can be used for packaging foods such as fruits and vegetables, and known materials can be used according to the foods to be packaged. Specific examples of synthetic resins contained in the resin material include various polyethylenes and ethylene copolymers, polypropylene, polyvinyl chloride, polystyrene, acrylic resins, polyester resins such as polyethylene terephthalate and polylactic acid, and polyamide resins such as 6 nylon. etc. These may be homopolymers, copolymers of two or more types, or blends containing two or more of these homopolymers or copolymers.
Specific examples of the above-mentioned various polyethylenes and ethylene copolymers include ethylene-vinyl alcohol copolymers, high-density polyethylene, medium-density polyethylene, low-density polyethylene, linear low-density polyethylene, metallocene-linear low-density Copolymers such as polyethylene, ethylene-vinyl acetate copolymers, ethylene-acrylic acid copolymers, ethylene-propylene copolymers, ethylene-α-olefin copolymers, and ionomers, and blends of these or two or more of these with other resins. may be

In addition, the resin material that constitutes the resin film according to the present embodiment is used to improve the dew condensation prevention properties of the packaging bag, the packaging container, and the lid material, and the fruits and vegetables that are housed inside the packaging bag, the packaging container, and the lid material. From the viewpoint of suppressing the growth of mold on the food, it may contain an anti-fogging agent. As the antifogging agent, known antifogging agents such as fatty acid esters of polyhydric alcohols and ethylene oxide adducts of higher aliphatic amines can be used. Specific examples thereof include glycerin monostearate, diglycerin laurate, decaglycerin laurate and sorbitan stearate.

Moreover, in the present embodiment, the resin film may be a single-layer film formed of the material described above, or may be a multilayer film in which a plurality of layers are laminated in the thickness direction. Here, when the resin film according to the present embodiment is the multi-layer film, such a film causes dew condensation on the inner surface of the package due to a small amount of water vapor released from food such as fruits and vegetables in the package. From the viewpoint of suppressing the above, it is preferable to have the resin layer containing an antifogging agent.

Here, as the resin film prepared in this production method, heat-sealable anti-fogging oriented polypropylene film, low-density polyethylene film, linear low-density polyethylene film, and metallocene-catalyzed polyethylene are preferably used from the viewpoint of price and physical properties. preferred from From the viewpoint of improving the durability against the weight of the contents, these resin films include a resin layer made of polyethylene on the surface of a resin film such as non-stretched polypropylene, stretched polypropylene, non-stretched nylon, stretched nylon, or stretched polyester. A multilayer film laminated by a dry lamination method, an extrusion lamination method, a co-extrusion method, or the like may also be used.

In addition, from the viewpoint of improving dew condensation prevention properties on the inner surface of the packaging bag, packaging container, and lid material obtained by this production method, one surface of the resin film is a resin material containing an ethylene-vinyl alcohol copolymer. and the other surface is formed of a resin material containing a polyamide resin, or a single-layer film formed of a resin material containing a polyamide resin is preferably used.

The method of molding the film is not particularly limited, but methods such as extrusion, inflation, and calendering are used. Here, the film may be wound into a roll, that is, in a wound shape. In the winding shape described above, the bottom surface of the roll shape (on the cylinder) is formed by a set of sides in the feeding direction (longitudinal direction) of the film. In addition, the said bottom surface represents a substantially circular surface.
When molding the film, if necessary, additives such as an antifog agent may be kneaded, or two or more resins may be blended. Further, the film may be subjected to stretching treatment, annealing treatment, or the like. A sealant layer may be provided on the surface of these films, or a film coated to impart some function may be used. Further, these films may be transparent or opaque, and may have product information printed on them.

Moreover, when the packaging film is used as a packaging bag, the thickness of the resin film according to the present embodiment may be, for example, 20 μm or more and 40 μm or less. If the film is too thin, there is a concern that the strength will be insufficient. On the other hand, if the film is too thick, the production cost will be high, and the practicality of the packaging bag may be reduced.
Moreover, when the packaging film is used as a packaging container, the thickness of the resin film according to the present embodiment may be, for example, 100 μm or more and 2000 μm or less. As a result, the packaging film can be irreversibly molded to form the packaging container without damaging the through holes of the packaging film.

Next, in this production method, through holes are formed by irradiating the prepared resin film with a laser using a laser irradiation device. At this time, in the present manufacturing method, in the width direction (lateral direction) of the resin film perpendicular to the feeding direction (longitudinal direction) of the resin film, so that the incident angle of the laser beam with respect to the surface of the resin film varies. The through-hole is bored while rotating the laser irradiation device. As a result, according to this manufacturing method, an elliptical through-hole having a major axis in the width direction (lateral direction) of the resin film perpendicular to the feeding direction of the resin film can be stably punched with good reproducibility. can. Further, according to this manufacturing method, the laser beam is irradiated while the laser irradiation device is swung and rotated. As a result, the resin film is partially melted by the heat of laser irradiation that is locally applied to the resin film, and by solidifying the melted portion, the shape of the resin nodule formed at the outer edge of the through-hole is controlled. can do. Then, according to the present production method, when packaging bags, packaging containers, and lid materials are affected by the above-described resin nodules, packaging bags, packaging containers, and lids that are superior in durability and stability during use compared to conventional ones. It is presumed that a lid material can be produced.

Further, in the present embodiment, the shape of the above-described resin nodules is determined by, for example, the composition of the resin material constituting the resin film, the energy of the laser to be irradiated, the irradiation distance of the laser, the direction of laser irradiation, the feeding speed of the film, and the like. A high degree of control can be achieved by appropriately combining various conditional factors relating to the drilling of through holes.

The configuration of the manufacturing apparatus used in this manufacturing method will be described below with reference to FIGS. 1 to 3. FIG. In addition, FIG. 1 is a cross-sectional view of a manufacturing apparatus for explaining the manufacturing method of the packaging film according to the present embodiment. FIG. 2 is an enlarged cross-sectional view of a main part of the laser irradiation device 3 in the manufacturing apparatus shown in FIG. FIG. 3 is a diagram for explaining the method of manufacturing the packaging film according to this embodiment.

According to the manufacturing apparatus of FIG. 1, when the resin film 2 unwound from the unwinding roll 1 passes between the laser irradiation device 3 and the rotating support roll 4, the laser irradiation device 3 emits a pulse laser beam to the resin film. 2 can be irradiated. By doing so, the resin film 2 can be provided with holes having the shape of the irradiated beam. The resin film 2 provided with holes by the above method is wound up by the winding roll 5 . Two guide rolls 6 are provided in front and behind the rotation support roll 4 . Also, the upper end of the rotation support roll 4 is located above the line connecting the upper ends of the two guide rolls 6 . Therefore, the resin film 2 can be pressed against the rotating support roll 4 so as to be in close contact with the laser irradiation position, and the occurrence of vertical wrinkles can be prevented. In addition, the manufacturing apparatus of FIG. 1 is provided with an unwinding roll 1 and a winding roll 5 via a rotation support roll 4 . In this manufacturing apparatus, the guide rolls 6 are provided between the rotating support roll 4 and the unwinding roll 1 and between the rotating support roll 4 and the take-up roll 5, respectively. Floating rolls 7 are provided between the unwinding roll 1 and the guide roll 6 and between the guide roll 6 and the take-up roll 5, respectively. By doing so, it is possible to apply appropriate tension to the resin film 2 by the floating roll 7 . In addition, the laser irradiation device 3 is provided with a compressed gas introduction path 8, and the compressed gas is blown along the laser beam from a nozzle tip 9 (see FIG. 2) against the resin film 2 during laser irradiation. be able to.

According to this manufacturing method, as shown in FIG.

Further, the pulse laser 10 passes through the light guide path 11 and is converged by the output optical section (lens) 12 , so that the resin film 2 can be irradiated with the conical beam 13 from the nozzle tip 9 . At this time, the inner diameter of the nozzle tip 9 is made larger than the beam diameter of the passing pulse laser 10 . Further, the focal position of the pulse laser 10 converged by the output optical section (lens) 12 should be slightly out of the film from the surface of the resin film 2 opposite to the laser incident surface.

As described above, the hole 14 is formed by irradiating the conical beam 13 and melting, decomposing, and volatilizing the beam-irradiated portion of the resin film 2 .

Also, the pitch of the holes 14 punched in the resin film 2 can be adjusted by synchronizing the traveling speed of the resin film 2 and the pulse frequency of the pulse laser 10 . Since 20 to 1,000 holes 14 can be drilled per second by one laser irradiation device, the running speed of the resin film 2 can be increased to achieve high productivity.

The shape of the hole 14 drilled in the resin film 2 is almost the same as the shape of the conical beam 13 passing through the resin film 2, so that a hole with a constant shape can always be drilled. The truncated conical hole can be made closer to a cylindrical shape by lengthening the focal length of the output optical section (lens) 12 .

Further, in the vicinity of the nozzle tip 9 of the light guide path 11 in the laser irradiation device 3, the compressed gas introduction path 8 is provided as described above. By doing so, the compressed gas can be blown along the laser beam against the resin film 2 during laser irradiation.

As for the flow rate of the compressed gas, the air velocity at the tip of the nozzle 9 should be set to 2 to 10 m/s so that the decomposition products generated by the drilling do not enter from the tip of the nozzle 9 and contaminate the output optical part (lens) 12. is preferred, and setting to 3 to 6 m/s is more preferred.

Also, the compressed gas is not particularly limited, but for example, in addition to compressed air, inert gases such as nitrogen gas and carbon dioxide gas can be used. Compressed air poses no danger in handling and is advantageous in terms of cost. The inert gas can suppress the oxidation of decomposition products of the plastic film and reduce soot, scorch, black oxide, and the like.

In the manufacturing method of the packaging film according to the present embodiment, the surface opposite to the laser incident surface is brought into contact with the rotating support roll 4 and the resin film 2 is supported by the rotating support roll 4 .
Further, it is preferable that the rotary support roll 4 is provided with, for example, a groove corresponding to the laser irradiation position so that the decomposition product of the resin film 2 can be volatilized from the side opposite to the laser incident surface. By doing so, it is possible to prevent the resin material forming the resin film 2 melted under the influence of the laser irradiation heat from adhering to the laser irradiation device. Therefore, as a result, it is possible to suppress the deterioration of the shape stability of the through holes formed in the resin film 2 . As a result, it is possible to stably maintain the freshness of foods such as fruits and vegetables for a long period of time, and when used as packaging bags, packaging containers, and lid materials, packaging bags and packaging containers that are excellent in durability and stability when used. , it becomes possible to produce a lid material.
When a plurality of through-holes are to be formed in the resin film 2, the rotating support roll 4 having grooves corresponding to the laser irradiation positions is used to avoid the influence of the radiant heat of the laser. It is possible to effectively suppress the occurrence of deviations in the size and shape of individual through-holes. Therefore, when the rotating support roll 4 provided with the above-described grooves is used in this manufacturing method, the through holes satisfy the same conditions in terms of the strength of the peripheral portion in addition to the individual size and shape. can be provided with a good yield.

In this manufacturing method, as described above, the width direction of the resin film 2 ( It is characterized by punching through holes while rotating the laser irradiation device 3 in the short direction). Specifically, as shown in FIG. 3, the width direction (lateral direction) of the resin film 2 perpendicular to the feeding direction (longitudinal direction) of the resin film 2 to be perforated is moved at a feeding speed of v1. A desired through-hole is formed by irradiating laser while rotating the laser irradiation device 3 at a speed of v2. At this time, the laser irradiation device 3 is preferably swung and rotated so that the incident angle θ of the laser beam with respect to the surface of the resin film 2 varies in the range of 30° or more and 90° or less, and in the range of 45° or more and 90° or less. More preferably, the laser irradiation device 3 is swung and rotated so that the angle varies in the range of 55° or more and 90° or less. By doing so, the shape of the through-holes can be highly controlled, and as a result, the packaging bag, packaging container, and lid material produced using the packaging film obtained by this manufacturing method are durable during use. Stability can be improved. That is, in this manufacturing method, the minimum value of the incident angle θ of the laser beam with respect to the surface of the resin film 2 is preferably 30° or more and less than 90°, more preferably 45° or more and less than 90°, and 55° or more. More preferably less than 90°.

Further, the value of v2/v1 calculated from the feeding speed v1 of the resin film 2 and the oscillation speed v2 of the laser irradiation device 3 when the through-holes are formed in the present manufacturing method is preferably 1.5. 20 or less, more preferably 1.5 or more and 15 or less, and still more preferably 1.5 or more and 13 or less. By doing so, it is possible to improve the strength of the through-holes provided in the resin film 2, and as a result, when the packaging film obtained by this manufacturing method is used to form a packaging bag, a packaging container, or a lid material, these Durability and stability during use can be improved. In addition, by controlling the perforation conditions of the through holes so that the value of v2/v1 is within the above numerical range, the gas permeability performance of the packaging bag, packaging container, and lid material obtained by this manufacturing method can be stably maintained for a long period of time. can be held at Therefore, by forming packaging bags, packaging containers, and lid materials using the packaging film obtained by this production method, it is possible to stably maintain the freshness of foods such as fruits and vegetables for a long period of time compared to conventional ones. Possible packaging bags, packaging containers, and lid materials can be obtained. In the following description, the manufacturing method will be described with reference numerals omitted.

Next, the type of laser irradiation apparatus used in this manufacturing method will be described.
The laser irradiation device used in this production method is not particularly limited as long as it can be used for punching through holes in the resin film 2 used for packaging foods such as fruits and vegetables, and a known device is used. can do. Therefore, the laser irradiation apparatus used in this production method may be a carbon dioxide laser irradiation type, a ruby laser irradiation type, a nitrogen laser irradiation type, or an argon gas irradiation type. , a neodymium YAG irradiation type, or a neodymium glass laser irradiation type. Among them, a carbon dioxide laser irradiation type laser irradiation device is preferable from the viewpoint of being able to drill a through-hole of a desired shape with good reproducibility because it has high energy efficiency and high output, and laser irradiation heat hardly stays in the irradiation target. .

In addition, from the viewpoint of improving the shape stability of the through holes, the energy of the laser irradiated in this manufacturing method is preferably 50 W or more and 200 W or less, more preferably 60 W or more and 150 W or less.

Further, in the present manufacturing method, from the viewpoint of improving the distance between the laser irradiation device and the resin film 2 to be perforated, that is, the shape stability of the through-holes, the laser irradiation distance is preferably 4 mm or more and 25 mm or less, More preferably, it is 4 mm or more and 20 mm or less, and still more preferably 7 mm or more and 15 mm or less.

Next, the conditions relating to the through-holes provided in the resin film by this manufacturing method, that is, the conditions relating to the through-holes provided in the packaging film obtained by this manufacturing method will be described.

In the present embodiment, the hole diameter (length) of the through-hole is preferably 20 μm or more and 1000 μm or less, more preferably 30 μm or more and 900 μm or less, and still more preferably 50 μm or more and 800 μm or less. By controlling the hole diameter (major diameter) of the through-holes to be within the above numerical range, the gas permeability performance of packaging bags, packaging containers, and lid materials produced using the packaging film obtained by this production method can be improved. can be controlled. Therefore, when food such as fruits and vegetables is stored using these packaging bags, packaging containers, and lid materials, it is possible to suppress variation in the degree of deterioration of the food.

Moreover, the shape of the through-holes provided in the resin film by this manufacturing method is elliptical as described above. The equivalent perfect circle diameter of such an elliptical through-hole is preferably 150 μm or more and 470 μm or less, more preferably 170 μm or more and 450 μm or less. By doing so, it is possible to control the gas permeation performance of the film material constituting the packaging bag, packaging container, and lid itself according to the present embodiment, so that the stored food such as fruits and vegetables can be more highly processed. It is possible to maintain the freshness of In addition, the perfect circle equivalent diameter according to the present embodiment refers to the diameter of a perfect circle having the same area as the opening area of the through hole measured. Further, in the present embodiment, when the number of through-holes provided in the resin film is two or more, the value of the equivalent circle diameter described above is the average of the equivalent circle diameter values calculated for all the through-holes. Point to value.

Further, in the present production method, the average opening area of the through-holes provided in the resin film is determined from the viewpoint of highly controlling the gas permeability performance (oxygen permeability, water vapor permeability, etc.) of the package described later. It is preferably 3.1×10 ⁻⁴ mm ² or more and 7.9×10 ⁻¹ mm ² or less, and 1.2×10 ⁻³ mm ² or more and 1.3×10 ⁻¹ mm ² or less per piece. is more preferable.

In this production method, the number of fine through-holes perforated in the resin film is preferably set to 1 m of the film from the viewpoint of highly controlling the gas permeability performance (oxygen permeability, water vapor permeability, etc.) of the package to be described later. 2 or more and 1000 or less per ² , more preferably 2 or more and 300 or less per 1 m ² of film.

In addition, the lower limit of the water vapor transmission rate at a temperature of 40 ° C. and 90% RH of the resin film constituting the packaging bag, packaging container, and lid material obtained by this manufacturing method is From the viewpoint of producing packaging bags, ^packaging containers ^, and lid materials that can stably maintain the freshness of foods such as That's it. On the other hand, the upper limit of the water vapor transmission rate of the resin film at 40° C. and 90% RH is preferably 400 g/m ² · from the viewpoint of suppressing deterioration of the appearance of foods such as fruits and vegetables in terms of wilting. day or less, more preferably 350 g/m ² ·day or less. The value of the water vapor transmission rate at 40° C. and 90% RH is determined, for example, using a water vapor transmission rate measuring device (PERMATRAN (registered trademark) PERMATRAN-W 3/61) manufactured by MOCON Co., Ltd., according to JIS. It can be measured by a method based on K7129B. The water vapor transmission rate of the resin film can also be measured by a method conforming to JIS Z0208 (cup method).

In addition, the lower limit of the oxygen permeation amount at a temperature of 23 ° C. and 50% RH of the resin film constituting the packaging bag, packaging container, and lid material obtained by this manufacturing method is From the viewpoint of producing a packaging bag that can stably maintain the freshness of food such as food for a long period of time, it is preferably 500 cc/m ² ·day · atm or more, more preferably 1000 cc / m ² ·day · atm or more be. On the other hand, the upper limit of the oxygen permeation amount of the resin film at 23 ° C. and 50% RH is preferably 200000 cc/m ² ·day from the viewpoint of suppressing deterioration of the appearance of foods such as fruits and vegetables in terms of wilting. · atm or less, more preferably 150000 cc/m ² ·day·atm or less. Regardless of the measurement conditions, the value of the oxygen permeability of the resin film can be measured, for example, using an oxygen permeability measuring device (Oxytran (registered trademark) OX-TRAN 1/50) manufactured by MOCON. It can be measured by a method based on Annex B of JIS K7126-2. Further, the value of the oxygen permeability of the resin film is, for example, the packaging bag and packaging container immediately after being filled with nitrogen, and the packaging bag and packaging container after being left for a certain period of time after being filled with nitrogen. It can also be calculated from the oxygen concentration gradient obtained by measuring the oxygen concentration in the bag or packaging container.

<Method for manufacturing packaging bag>
Next, a method for manufacturing a packaging bag using the packaging film will be described.
In the method for manufacturing a packaging bag, first, a perforated resin film obtained by punching through holes in the resin film 2 obtained by the method for manufacturing a packaging film described above, that is, a packaging film, is cut into a desired size. out. At this time, it is preferable that two or more through-holes are provided in one cut-out perforated resin film.
After that, the resulting packaging film is made into a bag. Specifically, the obtained perforated resin film is heat-sealed to form a bag having an opening for containing food such as fruits and vegetables. In this manner, a packaging bag is produced in this manufacturing method.
In the case of bag making, one side of the resin film 2 in the feeding direction is not heat-sealed in the manufacturing method of the packaging film. Thereby, a packaging bag having one side in the feeding direction as an opening can be obtained.

Moreover, in the manufacturing method of the packaging bag of the present embodiment, it is preferable that the packaging film is made so that two or more through-holes do not overlap each other when the packaging film is heat-sealed. By doing so, it becomes possible to control the gas permeability of the obtained packaging bag to a higher degree.

<Method for manufacturing packaging container>
Also, a method for manufacturing a packaging container using the packaging film will be described.
As a method for producing a packaging container, for example, a perforated resin film obtained by punching through holes in the resin film 2 obtained by the above-described method for producing a packaging film, that is, a packaging film is formed, and a packaging container is formed. including a molding step to obtain.
In the forming step, the method for forming the packaging film is not limited, and a conventionally known method can be used to form the container shape as long as the shape of the through holes is not deformed. Here, the shape of the container is not limited as long as it matches the shape of the food to be described later. Specific examples of the container shape include a tray shape, a columnar shape, a prismatic shape, a hemispherical shape, a spherical shape, a tube shape having a mouth, and a bottle shape having a mouth. Moreover, as for the shape of the container, for example, a projection may be provided on the portion where the food is stored. This is convenient in that it is possible to prevent the food contained in the packaging container from moving inside the packaging container in the process of manufacturing, transporting, and selling the package, which will be described later. Further, the shape of the container may be, for example, one having a flange with which the lid member is heat-sealed.
A method for forming a packaging film into a packaging container is not limited as long as it is a method for irreversibly forming a packaging film having an appropriate thickness. Specific examples of the method for forming the packaging film into the packaging container include vacuum forming, pressure forming, pressure vacuum forming, plug forming, plug assist pressure forming, blow forming, and the like.

It is preferable that the packaging container according to the present embodiment is provided with, for example, two or more through holes. That is, the method for manufacturing a packaging container according to this embodiment includes, for example, a step of forming a packaging film having two or more through holes.

Next, how to use the packaging bag and the packaging container according to the present embodiment will be described.

The packaging bag according to the present embodiment (hereinafter also referred to as the present packaging bag) and the packaging container according to the present embodiment (hereinafter also referred to as the present packaging container) can be used for fruits and vegetables, perishables, processed foods, etc. used to preserve the freshness of food.
A food-containing package can be obtained by housing food in the present packaging bag or the present packaging container. That is, the method for manufacturing a package according to the present embodiment includes a step of housing food in a packaging bag obtained by the method for manufacturing a packaging bag described above or a packaging container obtained by the method for manufacturing a packaging container described above. include.

Fruits and vegetables, for example, are preferable as foodstuffs contained in the packaging bag or the packaging container according to the present embodiment. Fruits and vegetables continue to breathe even after being stored, and dew condensation on the inner walls of packaging bags and packaging containers contributes to the freshness of foods. The packaging bag and packaging container according to the present embodiment can stably maintain the freshness of foods such as fruits and vegetables for a long period of time, and are excellent in durability and stability during use. That is, the packaging bag according to the present embodiment is preferably a freshness-preserving packaging bag for fruits and vegetables. Moreover, the packaging container according to the present embodiment is preferably a freshness-preserving packaging container for fruits and vegetables.

When the packaging bag and the packaging container according to the present embodiment are used to contain fruits and vegetables, the packaging bag and the packaging container are specifically designed to contain the fruits and vegetables that have been washed with water in the process from after harvest to packaging. use.

The packaging bag according to the present embodiment is preferably used by sealing the opening of the bag, for example, after storing fruits and vegetables inside. That is, according to the packaging bag of the present embodiment, it is possible to produce a fruit and vegetable-containing package in which fruit and vegetables are sealed. In other words, the fruit and vegetable-containing package according to the present embodiment is formed by, for example, sealing the fruit and vegetable in the main packaging bag described above.
Note that the packaging bag has a substantially rectangular shape when viewed from above before the fruits and vegetables are put therein. Here, the top view means observing from the thickness direction of the packaging bag.
In this embodiment, in order to seal the present packaging bag when producing the fruit and vegetable-containing package described above, the opening may be heat-sealed, or a back sealing tape, a binding band, a rubber band, or a crimp may be used. You may use members, such as. Above all, from the viewpoint of appropriately controlling the respiration rate of the fruits and vegetables accommodated in the packaging bag, it is preferable to apply a heat-sealing treatment to the opening in order to seal the packaging bag.

The packaging container according to the present embodiment is preferably used by sealing the packaging container after the fruits and vegetables are accommodated therein.
In the packaging container according to the present embodiment, for example, the food may be contained only in the packaging container, or the food may be contained in the packaging container with the lid member heat-sealed. When food is contained only in packaging containers, for example, two or more packaging containers can be fitted together for sealing.
As the lid material, for example, a known lid material may be selected according to the food to be accommodated, or a lid material using the packaging film according to the present embodiment, which will be described later, may be used.

Foods contained in packaging bags and packaging containers will be described in detail below.

Fruits and vegetables generally contain a large amount of water, and when the moisture evaporates, condensation often occurs in the packaging. Therefore, it is preferable to store the fruits and vegetables using the present packaging bag and the present packaging container. Specific examples of fruits and vegetables include plantain, spinach, Japanese mustard spinach, mizuna, mibuna, asparagus, Chinese cabbage, lettuce, thyme, sage, parsley, Italian parsley, rosemary, oregano, lemon balm, chives, lavender, salad burnet, lamb's ear, and rocket. , Dandelion, Nasturtium, Basil, Arugula, Watercress, Moroheiya, Celery, Kale, Green onion, Cabbage, Chinese cabbage, Shungiku, Saladana, Lettuce, Japanese butterbur, Nabana, Bok choy, Japanese mitsuba, Japanese parsley, Brussels sprouts, Broccoli, Cauliflower, Japanese ginger, Onion, Ginger, radish, carrot, burdock, radish, turnip, sweet potato, potato, Chinese yam, yam, taro, ginenjo, yamatoimo, bell pepper, paprika, shishito, cucumber, eggplant, tomato, cherry tomato, pumpkin, goya, okra, sweet corn, Edamame, snow peas, green beans, fava beans, shiitake mushrooms, king oyster mushrooms, shimeji mushrooms, and the like. Fruits such as citrus fruits, apples, pears, grapes, blueberries, persimmons, strawberries, melons, mangoes, Japanese apricots and green plums, and cut flowers such as chrysanthemums, carnations, cymbidiums, tulips and sakaki are also effective. These are effective even in cut state, so-called cut vegetables and cut fruits. Among them, fruits and vegetables contained in this packaging bag include fruits such as apples, lemons, Japanese plums and green plums; fruit vegetables such as eggplants, tomatoes, cucumbers and edamame; It preferably contains one or more species classified into any of the group consisting of fungi such as shimeji mushrooms, eryngii mushrooms, shiitake mushrooms, maitake mushrooms and hatake shimeji mushrooms, and flowering plants such as broccoli and asparagus.

The packaging bag and the packaging container of the present embodiment can pack fruits and vegetables that have been washed with water, or fruits and vegetables that have been wet with rain or dew without draining them, and thus workability is improved. It is also possible to evaporate all or part of the moisture of fruits and vegetables quickly, for reasons such as keeping the fruits and vegetables at a low temperature to preserve their freshness, or reducing the moisture content to remove the effects of moisture on the fruits and vegetables as quickly as possible. can. In such a case, the fruits and vegetables may be placed in the present packaging bag, sealed, and vacuum precooled.

In addition, from the viewpoint of improving the balance between consumer demand and manufacturing costs, the amount of contents (fruits and vegetables) contained in this packaging bag and this packaging container should be (inner dimension)), for example, the lower limit of the content may be 10 g or more per packaging bag, 50 g or more per packaging bag, or 100 g or more per packaging bag. Moreover, the upper limit of the content may be 1500 g or less per packaging bag, 1250 g or less, or 1000 g or less.

The packaging bag and packaging container according to the present embodiment are suitably used not only for fruits and vegetables but also for storing perishables.
Specific examples of perishables according to the present embodiment include meats such as beef, pork, chicken, wild boar, mutton, venison, horse meat, bear meat, crocodile meat, whale meat, fish meat; chicken eggs, quail eggs, Examples include eggs such as duck eggs, ostrich eggs, and pigeon eggs.
The packaging bag and packaging container according to the present embodiment can prevent temperature and humidity from significantly changing compared to the environment outside the bag and container. This is advantageous in that it is possible to prevent the interstitial fluid and blood of the meat from flowing out of the meat and reducing the freshness of the meat. In addition, it is convenient in that dew condensation derived from meat tissue fluid and blood does not occur. Furthermore, it is convenient in that it can suppress the deterioration of the freshness of perishable products due to the denaturation of proteins inside meat and eggs.

Moreover, the packaging bag and the packaging container according to the present embodiment are also suitably used when storing processed foods.
Processed foods according to the present embodiment include noodles, bread, pickles, foods boiled down in soy sauce, dried foods, pastes, sweets, and the like. Although some of these processed foods do not contain moisture directly, the packaging of processed foods takes in water vapor in the air. By using the packaging bag and the packaging container according to the present embodiment, it is convenient in that the freshness of processed foods can be maintained by suppressing dew condensation caused by water vapor in the atmosphere and preventing the occurrence of mold and the like.

Here, the inner surface area of the package according to the present embodiment (bag size (inner dimension) of the packaging bag, inner dimension of the packaging container) is set according to the shape, size, volume, density, etc. of the food to be packaged. can do. For example, when the food is fruits and vegetables, the inner surface area of the package per 100 g of fruits and vegetables may be, for example, 100 cm ² or more and 1000 cm ² or less, or 300 cm ² or more and 700 cm ² or less.

In addition, from the viewpoint of highly controlling the gas permeability performance (oxygen permeability, water vapor permeability, etc.) of the package itself, the package according to the present embodiment has, for example, the lower limit of the number of through holes per package. One or more values may be used, or two or more values may be used. On the other hand, the upper limit of the number of through-holes may be, for example, 100 or less, 50 or less, or 30 or less per package.

<Lid material>
The packaging film according to this embodiment may be used, for example, as a lid material for a packaging container. Here, the packaging container may be the packaging container according to the present embodiment described above, or a conventional packaging container without through-holes.
The lid material according to the present embodiment has heat-sealing properties, for example, by selecting the material of the resin film 2 described above. As a result, the packaging film according to this embodiment can be used as a lid material for sealing a packaging container by heat sealing.

Next, a method for manufacturing a lid material using the packaging film will be described.
In the method for producing the lid material, first, a perforated resin film obtained by punching through holes in the resin film 2 obtained by the above-described method for producing the packaging film, that is, the packaging film, is cut into a desired size. Including the process of putting out. At this time, it is preferable that two or more through-holes are provided in one cut-out perforated resin film.

Although the embodiments of the present invention have been described above, these are examples of the present invention, and various configurations other than those described above can also be adopted.
Examples of reference forms are added below.
1. preparing a resin film;
A step of drilling through holes in the resin film by irradiating the resin film with a laser irradiation device;
including
In the step of forming the through-holes, the laser irradiation device is rotated in the width direction of the resin film perpendicular to the feeding direction of the resin film so that the incident angle of the laser light with respect to the surface of the resin film varies. A method for producing a freshness-preserving packaging bag for fruits and vegetables, which comprises punching the through holes while swinging and rotating.
2. 1. The minimum value of the incident angle of the laser beam in the step of drilling the through holes is 30° or more and less than 90° with respect to the surface of the resin film; 3. The method for manufacturing the fruit and vegetable freshness-keeping packaging bag according to .
3. The value of v2/v1 is 1.5 or more, where v1 is the feeding speed of the resin film in the step of punching the through-holes, and v2 is the oscillation speed of the laser irradiation device in the step of punching the through-holes. 20 or less;1. or 2. 3. The method for manufacturing the fruit and vegetable freshness-keeping packaging bag according to .
4. 1. In the step of drilling the through-hole, the through-hole is drilled so that the equivalent circle diameter of the through-hole is 150 μm or more and 470 μm. to 3. The method for manufacturing the freshness-keeping packaging bag for fruits and vegetables according to any one of 1.
5. 1. The laser irradiation device is a carbon dioxide laser irradiation type laser irradiation device. to 4. The method for manufacturing the freshness-keeping packaging bag for fruits and vegetables according to any one of 1.
6. The laser irradiation device includes a rotating support roll that supports the resin film on the opposite side of the resin film,
In the step of forming the through-holes, the laser beam is irradiated to the surface of the resin film opposite to the side on which the laser beam is incident, at a position where the rotating support roll and the resin film are not in contact. 1. to drill the through holes; to 5. The method for manufacturing the freshness-keeping packaging bag for fruits and vegetables according to any one of 1.
7. 1. After the step of punching the through-holes, the step of bag-making the resin film provided with two or more of the through-holes; to 6. The method for manufacturing the freshness-keeping packaging bag for fruits and vegetables according to any one of 1.
8. 7. In the bag-making step, the resin film is made so that two or more of the through-holes do not overlap with each other; 3. The method for manufacturing the fruit and vegetable freshness-keeping packaging bag according to .
9. 1. to 8. A method for producing a package containing fruits and vegetables, comprising a step of housing fruits and vegetables in a freshness-keeping packaging bag for fruits and vegetables obtained by the method for producing a freshness-keeping packaging bag for fruits and vegetables according to any one of .

EXAMPLES The present invention will be described below with reference to Examples and Comparative Examples, but the present invention is not limited to these.

<Example 1>
First, an antifogging biaxially stretched polypropylene film (hereinafter also referred to as "antifogging OPP") (manufactured by Gunze, trade name: Silphan MV2, thickness 40 µm) was prepared as a resin film. A desired perforated resin film, that is, a packaging film was obtained by perforating 50 through holes per 1 m ² in this resin film by the method described later. Next, after cutting the perforated resin film into a predetermined size, the two films are overlapped so that two or more through holes do not overlap each other, and an impulse sealer (FI-400Y-10PK, manufactured by Fuji Impulse Co., Ltd.) is applied. A packaging bag of Example 1 was produced by heat-sealing three sides of the bag to form a heat-sealed portion with a width of 10 mm. The heat sealing conditions were set to 5.5 for the setting scale of the seal, and 2 seconds for the pressurization/heating time. Here, by not heat-sealing one side of the film in the feed direction, a packaging bag having one side in the feed direction as an opening was obtained.
The bag size (inner dimensions) of the resulting packaging bag was 200 x 200 mm, and the inner surface of the packaging bag (excluding the heat-sealed portion) was provided with four through-holes per one packaging bag. It was confirmed that In addition, when the surface of the packaging bag is viewed from above, the shape of the through-hole provided in the obtained packaging bag is the side having the opening shape of the opening constituting the through-hole and the shape of the through-hole. It was confirmed to be an oval shape having a major axis extending in a direction in which the angle formed with the major axis direction is 45 degrees or more and 90 degrees or less. In addition, the equivalent perfect circle diameter (average value of four holes) of the through-holes provided in the obtained packaging bag was as shown in Table 1 below.
In this specification, the oval shape refers to a shape that has at least one or more symmetrical axes, does not intersect, is convex outward, and is closed and composed of curved lines on a plane. show.

Perforation in Example 1 was performed by the following method. The conditions shown in Table 1 below were adopted as perforation conditions such as the film feeding speed, the incident angle of the laser beam with respect to the film, and the oscillation speed of the laser irradiation device.
First, a roll having a diameter of 318 mm and a width of 850 mm was provided with a rotary support roll having five grooves of 30 mm width and 5 mm depth at intervals of 100 mm from positions 150 mm from both ends. On the other hand, a carbon dioxide gas laser with an output of 150 watts was prepared as a laser irradiation device. Each of these five laser irradiation devices was installed so that the laser irradiation position corresponded to the position of the groove of the rotating support roll. In addition, the laser irradiation device was installed so that the distance from the film was 12 mm.

Next, using the apparatus shown in FIG. 1-3, the film was run on the rotating support roll by rotating the rotating support roll at a peripheral speed of 100 m/min. Next, the running film was irradiated with a pulse laser 10 times per second while each laser irradiation device was rotated under the conditions shown in Table 1. At this time, a nitrogen gas pressure of 1.0 kg/cm ² (gauge pressure) was applied to the compressed gas introduction path, and the nitrogen gas was blown along the laser beam from the tip of the nozzle during laser irradiation.

<Example 2>
First, an antifogging biaxially stretched polypropylene film (hereinafter also referred to as "antifogging OPP") (manufactured by Gunze, trade name: Silphan MV2, thickness 25 µm) was prepared as a resin film. This resin film was perforated with 17 through holes per m ² by the method described later to obtain a desired perforated resin film, that is, a packaging film. Next, after cutting the perforated resin film into a predetermined size, the two films are overlapped so that two or more through holes do not overlap each other, and an impulse sealer (FI-400Y-10PK, manufactured by Fuji Impulse Co., Ltd.) is applied. A packaging bag of Example 2 was produced by heat-sealing on three sides to form a heat-sealed portion with a width of 10 mm. The heat sealing conditions were set to 5.5 for the setting scale of the seal, and 2 seconds for the pressurization/heating time. Here, by not heat-sealing one side of the film in the feed direction, a packaging bag having one side in the feed direction as an opening was obtained.
The bag size (inner dimensions) of the obtained packaging bag was 180×160 mm, and the inner surface of the packaging bag (excluding the heat-sealed portion) was provided with one through-hole per one packaging bag. It was confirmed that In addition, when the surface of the packaging bag is viewed from above, the shape of the through-hole provided in the obtained packaging bag is such that when the surface of the packaging bag is viewed from above, the side having the opening shape of the opening constituting the through-hole and the long axis direction of the through-hole It was confirmed that the oval shape has a major axis extending in a direction in which the angle formed by the two is 45 degrees or more and 90 degrees or less. The diameters of the through-holes formed in the resulting packaging bags were as shown in Table 1 below.

Perforation in Example 2 was performed by the following method. The conditions shown in Table 1 below were adopted as perforation conditions such as the film feeding speed, the incident angle of the laser beam with respect to the film, and the oscillation speed of the laser irradiation device.
First, a roll having a diameter of 318 mm and a width of 850 mm was provided with a rotary support roll having five grooves of 30 mm width and 5 mm depth at intervals of 100 mm from positions 150 mm from both ends. On the other hand, a carbon dioxide gas laser with an output of 150 watts was prepared as a laser irradiation device. Each of these five laser irradiation devices was installed so that the laser irradiation position corresponded to the position of the groove of the rotating support roll. In addition, the laser irradiation device was installed so that the distance from the film was 12 mm.

Next, using the apparatus shown in FIG. 1-3, the film was run on the rotating support roll by rotating the rotating support roll at a peripheral speed of 50 m/min. Next, the running film was irradiated with a pulse laser 10 times per second while each laser irradiation device was rotated under the conditions shown in Table 1. At this time, a nitrogen gas pressure of 1.0 kg/cm ² (gauge pressure) was applied to the compressed gas introduction path, and the nitrogen gas was blown along the laser beam from the tip of the nozzle during laser irradiation.

<Example 3>
First, an antifogging biaxially stretched polypropylene film (hereinafter also referred to as "antifogging OPP") (manufactured by Gunze, trade name: Silphan MV2, thickness 30 µm) was prepared as a resin film. This resin film was perforated with 71 through holes per m ² by the method described later to obtain a desired perforated resin film, that is, a packaging film. Next, after cutting the perforated resin film into a predetermined size, the two films are overlapped so that two or more through holes do not overlap each other, and an impulse sealer (FI-400Y-10PK, manufactured by Fuji Impulse Co., Ltd.) is applied. A packaging bag of Example 3 was produced by heat-sealing on three sides to form a heat-sealed portion with a width of 10 mm. The heat sealing conditions were set to 5.5 for the setting scale of the seal, and 2 seconds for the pressurization/heating time. Here, by not heat-sealing one side of the film in the feed direction, a packaging bag having one side in the feed direction as an opening was obtained.
The bag size (inner dimensions) of the resulting packaging bag was 200×350 mm, and 10 through-holes per packaging bag were provided on the inner surface of the packaging bag (excluding the heat-sealed portion). It was confirmed that In addition, when the surface of the packaging bag is viewed from above, the shape of the through-hole provided in the obtained packaging bag is the side having the opening shape of the opening constituting the through-hole and the shape of the through-hole. It was confirmed to be an oval shape having a major axis extending in a direction in which the angle formed with the major axis direction is 45 degrees or more and 90 degrees or less. In addition, the equivalent perfect circle diameter (average value of 10 holes) of the through-holes provided in the obtained packaging bag was as shown in Table 1 below.

Perforation in Example 3 was performed by the following method. The conditions shown in Table 1 below were adopted as perforation conditions such as the film feeding speed, the incident angle of the laser beam with respect to the film, and the oscillation speed of the laser irradiation device.
First, a roll having a diameter of 318 mm and a width of 850 mm was provided with a rotary support roll having five grooves of 30 mm width and 5 mm depth at intervals of 100 mm from positions 150 mm from both ends. On the other hand, a carbon dioxide gas laser with an output of 150 watts was prepared as a laser irradiation device. Each of these five laser irradiation devices was installed so that the laser irradiation position corresponded to the position of the groove of the rotating support roll. In addition, the laser irradiation device was installed so that the distance from the film was 12 mm.

Next, using the apparatus shown in FIG. 1-3, the film was run on the rotating support roll by rotating the rotating support roll at a peripheral speed of 50 m/min. Next, the running film was irradiated with a pulse laser 10 times per second while each laser irradiation device was rotated under the conditions shown in Table 1. At this time, a nitrogen gas pressure of 1.0 kg/cm ² (gauge pressure) was applied to the compressed gas introduction path, and the nitrogen gas was blown along the laser beam from the tip of the nozzle during laser irradiation.

<Example 4>
First, an antifogging biaxially stretched polypropylene film (hereinafter also referred to as "antifogging OPP") (manufactured by Gunze, trade name: Silphan MV2, thickness 25 µm) was prepared as a resin film. This resin film was perforated with 300 through-holes per m ² by a method described later to obtain a desired perforated resin film, that is, a packaging film. Next, after cutting the perforated resin film into a predetermined size, the two films are overlapped so that two or more through holes do not overlap each other, and an impulse sealer (FI-400Y-10PK, manufactured by Fuji Impulse Co., Ltd.) is applied. A packaging bag of Example 4 was produced by heat-sealing on three sides to form a heat-sealed portion with a width of 10 mm. The heat sealing conditions were set to 5.5 for the setting scale of the seal, and 2 seconds for the pressurization/heating time. Here, by not heat-sealing one side of the film in the feed direction, a packaging bag having one side in the feed direction as an opening was obtained.
The bag size (inner dimensions) of the obtained packaging bag was 160×210 mm, and 20 through-holes per packaging bag were provided on the inner surface of the packaging bag (excluding the heat-sealed portion). It was confirmed that In addition, when the surface of the packaging bag is viewed from above, the shape of the through-hole provided in the obtained packaging bag is the side having the opening shape of the opening constituting the through-hole and the shape of the through-hole. It was confirmed to be an oval shape having a major axis extending in a direction in which the angle formed with the major axis direction is 45 degrees or more and 90 degrees or less. In addition, the equivalent perfect circle diameter (average value of 20 holes) of the through-holes provided in the obtained packaging bag was as shown in Table 1 below.

Perforation in Example 4 was performed by the following method. The conditions shown in Table 1 below were adopted as perforation conditions such as the film feeding speed, the incident angle of the laser beam with respect to the film, and the oscillation speed of the laser irradiation device.
First, a roll having a diameter of 318 mm and a width of 850 mm was provided with a rotary support roll having five grooves of 30 mm width and 5 mm depth at intervals of 100 mm from positions 150 mm from both ends. On the other hand, a carbon dioxide gas laser with an output of 150 watts was prepared as a laser irradiation device. Each of these five laser irradiation devices was installed so that the laser irradiation position corresponded to the position of the groove of the rotating support roll. In addition, the laser irradiation device was installed so that the distance from the film was 12 mm.

Next, using the apparatus shown in FIG. 1-3, the film was run on the rotating support roll by rotating the rotating support roll at a peripheral speed of 100 m/min. Next, the running film was irradiated with a pulse laser 10 times per second while each laser irradiation device was rotated under the conditions shown in Table 1. At this time, a nitrogen gas pressure of 1.0 kg/cm ² (gauge pressure) was applied to the compressed gas introduction path, and the nitrogen gas was blown along the laser beam from the tip of the nozzle during laser irradiation.

<Example 5>
First, an antifogging biaxially stretched polypropylene film (hereinafter also referred to as "antifogging OPP") (manufactured by Gunze, trade name: Silphan MV2, thickness 25 µm) was prepared as a resin film. A desired perforated resin film, that is, a packaging film was obtained by perforating 52 through holes per 1 m ² in this resin film by the method described later. Next, after cutting the perforated resin film into a predetermined size, the two films are overlapped so that two or more through holes do not overlap each other, and an impulse sealer (FI-400Y-10PK, manufactured by Fuji Impulse Co., Ltd.) is applied. A packaging bag of Example 5 was produced by heat-sealing on three sides to form a heat-sealed portion with a width of 10 mm. The heat sealing conditions were set to 5.5 for the setting scale of the seal, and 2 seconds for the pressurization/heating time. Here, by not heat-sealing one side of the film in the feed direction, a packaging bag having one side in the feed direction as an opening was obtained.
The bag size (inner dimensions) of the obtained packaging bag was 180×160 mm, and the inner surface of the packaging bag (excluding the heat-sealed portion) was provided with three through-holes per one packaging bag. It was confirmed that In addition, when the surface of the packaging bag is viewed from above, the shape of the through-hole provided in the obtained packaging bag is the side having the opening shape of the opening constituting the through-hole and the shape of the through-hole. It was confirmed to be an oval shape having a major axis extending in a direction in which the angle formed with the major axis direction is 45 degrees or more and 90 degrees or less. The equivalent perfect circle diameter (average value of three holes) of the through-holes provided in the obtained packaging bag was as shown in Table 1 below.

Perforation in Example 5 was performed by the following method. The conditions shown in Table 1 below were adopted as perforation conditions such as the film feeding speed, the incident angle of the laser beam with respect to the film, and the oscillation speed of the laser irradiation device.
First, a roll having a diameter of 318 mm and a width of 850 mm was provided with a rotary support roll having five grooves of 30 mm width and 5 mm depth at intervals of 100 mm from positions 150 mm from both ends. On the other hand, a carbon dioxide gas laser with an output of 150 watts was prepared as a laser irradiation device. Each of these five laser irradiation devices was installed so that the laser irradiation position corresponded to the position of the groove of the rotating support roll. In addition, the laser irradiation device was installed so that the distance from the film was 12 mm.

Next, using the apparatus shown in FIG. 1-3, the film was run on the rotating support roll by rotating the rotating support roll at a peripheral speed of 100 m/min. Next, the running film was irradiated with a pulse laser 10 times per second while each laser irradiation device was rotated under the conditions shown in Table 1. At this time, a nitrogen gas pressure of 1.0 kg/cm ² (gauge pressure) was applied to the compressed gas introduction path, and the nitrogen gas was blown along the laser beam from the tip of the nozzle during laser irradiation.

<Example 6>
First, an antifogging biaxially stretched polypropylene film (hereinafter also referred to as "antifogging OPP") (manufactured by Gunze, trade name: Silphan MV2, thickness 25 µm) was prepared as a resin film. This resin film was perforated with 108 through-holes per m ² by a method described later to obtain a desired perforated resin film, that is, a packaging film. Next, after cutting the perforated resin film into a predetermined size, the two films are overlapped so that two or more through holes do not overlap each other, and an impulse sealer (FI-400Y-10PK, manufactured by Fuji Impulse Co., Ltd.) is applied. A packaging bag of Example 6 was produced by heat-sealing on three sides to form a heat-sealed portion with a width of 10 mm. The heat sealing conditions were set to 5.5 for the setting scale of the seal, and 2 seconds for the pressurization/heating time. Here, by not heat-sealing one side of the film in the feed direction, a packaging bag having one side in the feed direction as an opening was obtained.
The bag size (inner dimensions) of the resulting packaging bag was 240×290 mm, and 15 through-holes per packaging bag were provided on the inner surface of the packaging bag (excluding the heat-sealed portion). It was confirmed that In addition, when the surface of the packaging bag is viewed from above, the shape of the through-hole provided in the obtained packaging bag is the side having the opening shape of the opening constituting the through-hole and the shape of the through-hole. It was confirmed to be an oval shape having a major axis extending in a direction in which the angle formed with the major axis direction is 45 degrees or more and 90 degrees or less. In addition, the equivalent perfect circle diameter (average value of 15 holes) of the through-holes provided in the obtained packaging bag was as shown in Table 1 below.

Perforation in Example 6 was performed by the following method. The conditions shown in Table 1 below were adopted as perforation conditions such as the film feeding speed, the incident angle of the laser beam with respect to the film, and the oscillation speed of the laser irradiation device.
First, a roll having a diameter of 318 mm and a width of 850 mm was provided with a rotary support roll having five grooves of 30 mm width and 5 mm depth at intervals of 100 mm from positions 150 mm from both ends. On the other hand, a carbon dioxide gas laser with an output of 150 watts was prepared as a laser irradiation device. Each of these five laser irradiation devices was installed so that the laser irradiation position corresponded to the position of the groove of the rotating support roll. In addition, the laser irradiation device was installed so that the distance from the film was 12 mm.

Next, using the apparatus shown in FIG. 1-3, the film was run on the rotating support roll by rotating the rotating support roll at a peripheral speed of 100 m/min. Next, the running film was irradiated with a pulse laser 10 times per second while each laser irradiation device was rotated under the conditions shown in Table 1. At this time, a nitrogen gas pressure of 1.0 kg/cm ² (gauge pressure) was applied to the compressed gas introduction path, and the nitrogen gas was blown along the laser beam from the tip of the nozzle during laser irradiation.

<Comparative Example 1>
First, an antifogging biaxially stretched polypropylene film (hereinafter also referred to as "antifogging OPP") (manufactured by Gunze, trade name: Silphan MV2, thickness 40 µm) was prepared as a resin film. A desired perforated resin film, that is, a packaging film was obtained by perforating 50 through holes per 1 m ² in this resin film by the method described later. Next, after cutting the perforated resin film into a predetermined size, the two films are overlapped so that two or more through holes do not overlap each other, and an impulse sealer (FI-400Y-10PK, manufactured by Fuji Impulse Co., Ltd.) is applied. A packaging bag of Comparative Example 1 was produced by heat-sealing on three sides to form a heat-sealed portion with a width of 10 mm. The heat sealing conditions were set to 5.5 for the setting scale of the seal, and 2 seconds for the pressurization/heating time. Here, by not heat-sealing one side of the film in the feed direction, a packaging bag having one side in the feed direction as an opening was obtained.
The bag size (inner dimensions) of the resulting packaging bag was 200 x 200 mm, and the inner surface of the packaging bag (excluding the heat-sealed portion) was provided with four through-holes per one packaging bag. It was confirmed that In addition, the shape of the through-hole provided in the obtained packaging bag is such that when the surface of the packaging bag is viewed from above, the shape of the opening constituting the through-hole is the same as that of the opening constituting the through-hole. It was confirmed that the side having the opening shape of the part and the major diameter direction of the through hole formed an oval shape with a major diameter extending in a direction in which the angle formed was 0 degrees or more and 45 degrees or less. In addition, the equivalent perfect circle diameter (average value of four holes) of the through-holes provided in the obtained packaging bag was as shown in Table 1 below.

In this comparative example, perforation was performed by the following method. The conditions shown in Table 1 below were adopted as perforation conditions such as the film feeding speed, the incident angle of the laser beam with respect to the film, and the oscillation speed of the laser irradiation device.
First, a roll having a diameter of 318 mm and a width of 850 mm was provided with a rotary support roll having five grooves of 30 mm width and 5 mm depth at intervals of 100 mm from positions 150 mm from both ends. On the other hand, a carbon dioxide gas laser with an output of 150 watts was prepared as a laser irradiation device. Each of these five laser irradiation devices was installed so that the laser irradiation position corresponded to the position of the groove of the rotating support roll. In addition, the laser irradiation device was installed so that the distance from the film was 12 mm.

Next, using the apparatus shown in FIGS. 1 and 2, the film was run on the rotating support roll by rotating the rotating support roll at a peripheral speed of 100 m/min. Next, without rotating each laser irradiation device, a pulse laser was irradiated 10 times per second from a direction perpendicular to the running film. At this time, a nitrogen gas pressure of 1.0 kg/cm ² (gauge pressure) was applied to the compressed gas introduction path, and the nitrogen gas was blown along the laser beam from the tip of the nozzle during laser irradiation.

<Comparative Example 2>
First, an antifogging biaxially stretched polypropylene film (hereinafter also referred to as "antifogging OPP") (manufactured by Gunze, trade name: Silphan MV2, thickness 25 µm) was prepared as a resin film. This resin film was perforated with 17 through holes per m ² by the method described later to obtain a desired perforated resin film, that is, a packaging film. Next, after cutting the perforated resin film into a predetermined size, the two films are overlapped so that two or more through holes do not overlap each other, and an impulse sealer (FI-400Y-10PK, manufactured by Fuji Impulse Co., Ltd.) is applied. A packaging bag of Comparative Example 2 was produced by heat-sealing on three sides to form a heat-sealed portion with a width of 10 mm. The heat sealing conditions were set to 5.5 for the setting scale of the seal, and 2 seconds for the pressurization/heating time. Here, by not heat-sealing one side of the film in the feed direction, a packaging bag having one side in the feed direction as an opening was obtained.
The bag size (inner dimensions) of the obtained packaging bag was 180×160 mm, and the inner surface of the packaging bag (excluding the heat-sealed portion) was provided with one through-hole per one packaging bag. It was confirmed that In addition, when the surface of the packaging bag is viewed from above, the shape of the through-hole provided in the obtained packaging bag is such that when the surface of the packaging bag is viewed from above, the side having the opening shape of the opening constituting the through-hole and the long axis direction of the through-hole It was confirmed that the oval shape has a major axis extending in a direction in which the angle formed by the two is 0 degree or more and 45 degrees or less. The diameters of the through-holes formed in the resulting packaging bags were as shown in Table 1 below.

In this comparative example, perforation was performed by the following method. The conditions shown in Table 1 below were adopted as perforation conditions such as the film feeding speed, the incident angle of the laser beam with respect to the film, and the oscillation speed of the laser irradiation device.
First, a roll having a diameter of 318 mm and a width of 850 mm was provided with a rotary support roll having five grooves of 30 mm width and 5 mm depth at intervals of 100 mm from positions 150 mm from both ends. On the other hand, a carbon dioxide gas laser with an output of 150 watts was prepared as a laser irradiation device. Each of these five laser irradiation devices was installed so that the laser irradiation position corresponded to the position of the groove of the rotating support roll. In addition, the laser irradiation device was installed so that the distance from the film was 12 mm.

Next, using the apparatus shown in FIGS. 1 and 2, the film was run on the rotating support roll by rotating the rotating support roll at a peripheral speed of 50 m/min. Next, without rotating each laser irradiation device, a pulse laser was irradiated 10 times per second from a direction perpendicular to the running film. At this time, a nitrogen gas pressure of 1.0 kg/cm ² (gauge pressure) was applied to the compressed gas introduction path, and the nitrogen gas was blown along the laser beam from the tip of the nozzle during laser irradiation.

<Comparative Example 3>
First, an antifogging biaxially stretched polypropylene film (hereinafter also referred to as "antifogging OPP") (manufactured by Gunze, trade name: Silphan MV2, thickness 30 µm) was prepared as a resin film. This resin film was perforated with 71 through holes per m ² by the method described later to obtain a desired perforated resin film, that is, a packaging film. Next, after cutting the perforated resin film into a predetermined size, the two films are overlapped so that two or more through holes do not overlap each other, and an impulse sealer (FI-400Y-10PK, manufactured by Fuji Impulse Co., Ltd.) is applied. A packaging bag of Comparative Example 3 was produced by heat-sealing on three sides to form a heat-sealed portion with a width of 10 mm. The heat sealing conditions were set to 5.5 for the setting scale of the seal, and 2 seconds for the pressurization/heating time. Here, by not heat-sealing one side of the film in the feed direction, a packaging bag having one side in the feed direction as an opening was obtained.
The bag size (inner dimensions) of the resulting packaging bag was 200×350 mm, and 10 through-holes per packaging bag were provided on the inner surface of the packaging bag (excluding the heat-sealed portion). It was confirmed that In addition, when the surface of the packaging bag is viewed from above, the shape of the through-hole provided in the obtained packaging bag is the side having the opening shape of the opening constituting the through-hole and the shape of the through-hole. It was confirmed to be an oval shape having a major axis extending in a direction in which the angle formed with the major axis direction is 0 degrees or more and 45 degrees or less. In addition, the equivalent perfect circle diameter (average value of 10 holes) of the through-holes provided in the obtained packaging bag was as shown in Table 1 below.

In this comparative example, perforation was performed by the following method. The conditions shown in Table 1 below were adopted as perforation conditions such as the film feeding speed, the incident angle of the laser beam with respect to the film, and the oscillation speed of the laser irradiation device.
First, a roll having a diameter of 318 mm and a width of 850 mm was provided with a rotary support roll having five grooves of 30 mm width and 5 mm depth at intervals of 100 mm from positions 150 mm from both ends. On the other hand, a carbon dioxide gas laser with an output of 150 watts was prepared as a laser irradiation device. Each of these five laser irradiation devices was installed so that the laser irradiation position corresponded to the position of the groove of the rotating support roll. In addition, the laser irradiation device was installed so that the distance from the film was 12 mm.

Next, using the apparatus shown in FIGS. 1 and 2, the film was run on the rotating support roll by rotating the rotating support roll at a peripheral speed of 50 m/min. Next, without rotating each laser irradiation device, a pulse laser was irradiated 10 times per second from a direction perpendicular to the running film. At this time, a nitrogen gas pressure of 1.0 kg/cm ² (gauge pressure) was applied to the compressed gas introduction path, and the nitrogen gas was blown along the laser beam from the tip of the nozzle during laser irradiation.

<Comparative Example 4>
First, an antifogging biaxially stretched polypropylene film (hereinafter also referred to as "antifogging OPP") (manufactured by Gunze, trade name: Silphan MV2, thickness 25 µm) was prepared as a resin film. This resin film was perforated with 300 through-holes per m ² by a method described later to obtain a desired perforated resin film, that is, a packaging film. Next, after cutting the perforated resin film into a predetermined size, the two films are overlapped so that two or more through holes do not overlap each other, and an impulse sealer (FI-400Y-10PK, manufactured by Fuji Impulse Co., Ltd.) is applied. A packaging bag of Comparative Example 4 was produced by heat-sealing on three sides to form a heat-sealed portion with a width of 10 mm. The heat sealing conditions were set to 5.5 for the setting scale of the seal, and 2 seconds for the pressurization/heating time. Here, by not heat-sealing one side of the film in the feed direction, a packaging bag having one side in the feed direction as an opening was obtained.
The bag size (inner dimensions) of the obtained packaging bag was 160×210 mm, and 20 through-holes per packaging bag were provided on the inner surface of the packaging bag (excluding the heat-sealed portion). It was confirmed that In addition, when the surface of the packaging bag is viewed from above, the shape of the through-hole provided in the obtained packaging bag is the side having the opening shape of the opening constituting the through-hole and the shape of the through-hole. It was confirmed to be an oval shape having a major axis extending in a direction in which the angle formed with the major axis direction is 0 degrees or more and 45 degrees or less. In addition, the equivalent perfect circle diameter (average value of 20 holes) of the through-holes provided in the obtained packaging bag was as shown in Table 1 below.

In this comparative example, perforation was performed by the following method. The conditions shown in Table 1 below were adopted as perforation conditions such as the film feeding speed, the incident angle of the laser beam with respect to the film, and the oscillation speed of the laser irradiation device.
First, a roll having a diameter of 318 mm and a width of 850 mm was provided with a rotary support roll having five grooves of 30 mm width and 5 mm depth at intervals of 100 mm from positions 150 mm from both ends. On the other hand, a carbon dioxide gas laser with an output of 150 watts was prepared as a laser irradiation device. Each of these five laser irradiation devices was installed so that the laser irradiation position corresponded to the position of the groove of the rotating support roll. In addition, the laser irradiation device was installed so that the distance from the film was 12 mm.

Next, using the apparatus shown in FIGS. 1 and 2, the film was run on the rotating support roll by rotating the rotating support roll at a peripheral speed of 100 m/min. Next, without rotating each laser irradiation device, a pulse laser was irradiated 10 times per second from a direction perpendicular to the running film. At this time, a nitrogen gas pressure of 1.0 kg/cm ² (gauge pressure) was applied to the compressed gas introduction path, and the nitrogen gas was blown along the laser beam from the tip of the nozzle during laser irradiation.

<Comparative Example 5>
First, an antifogging biaxially stretched polypropylene film (hereinafter also referred to as "antifogging OPP") (manufactured by Gunze, trade name: Silphan MV2, thickness 25 µm) was prepared as a resin film. A desired perforated resin film, that is, a packaging film was obtained by perforating 52 through holes per 1 m ² in this resin film by the method described later. Next, after cutting the perforated resin film into a predetermined size, the two films are overlapped so that two or more through holes do not overlap each other, and an impulse sealer (FI-400Y-10PK, manufactured by Fuji Impulse Co., Ltd.) is applied. A packaging bag of Comparative Example 5 was produced by heat-sealing on three sides to form a heat-sealed portion with a width of 10 mm. The heat sealing conditions were set to 5.5 for the setting scale of the seal, and 2 seconds for the pressurization/heating time. Here, by not heat-sealing one side of the film in the feed direction, a packaging bag having one side in the feed direction as an opening was obtained.
The bag size (inner dimensions) of the obtained packaging bag was 180×160 mm, and the inner surface of the packaging bag (excluding the heat-sealed portion) was provided with three through-holes per one packaging bag. It was confirmed that In addition, when the surface of the packaging bag is viewed from above, the shape of the through-hole provided in the obtained packaging bag is the side having the opening shape of the opening constituting the through-hole and the shape of the through-hole. It was confirmed to be an oval shape having a major axis extending in a direction in which the angle formed with the major axis direction is 0 degrees or more and 45 degrees or less. The equivalent perfect circle diameter (average value of three holes) of the through-holes provided in the obtained packaging bag was as shown in Table 1 below.

In this comparative example, perforation was performed by the following method. The conditions shown in Table 1 below were adopted as perforation conditions such as the film feeding speed, the incident angle of the laser beam with respect to the film, and the oscillation speed of the laser irradiation device.
First, a roll having a diameter of 318 mm and a width of 850 mm was provided with a rotary support roll having five grooves of 30 mm width and 5 mm depth at intervals of 100 mm from positions 150 mm from both ends. On the other hand, a carbon dioxide gas laser with an output of 150 watts was prepared as a laser irradiation device. Each of these five laser irradiation devices was installed so that the laser irradiation position corresponded to the position of the groove of the rotating support roll. In addition, the laser irradiation device was installed so that the distance from the film was 12 mm.

Next, using the apparatus shown in FIGS. 1 and 2, the film was run on the rotating support roll by rotating the rotating support roll at a peripheral speed of 100 m/min. Next, without rotating each laser irradiation device, a pulse laser was irradiated 10 times per second from a direction perpendicular to the running film. At this time, a nitrogen gas pressure of 1.0 kg/cm ² (gauge pressure) was applied to the compressed gas introduction path, and the nitrogen gas was blown along the laser beam from the tip of the nozzle during laser irradiation.

<Comparative Example 6>
First, an antifogging biaxially stretched polypropylene film (hereinafter also referred to as "antifogging OPP") (manufactured by Gunze, trade name: Silphan MV2, thickness 25 µm) was prepared as a resin film. This resin film was perforated with 108 through-holes per m ² by a method described later to obtain a desired perforated resin film, that is, a packaging film. Next, after cutting the perforated resin film into a predetermined size, the two films are overlapped so that two or more through holes do not overlap each other, and an impulse sealer (FI-400Y-10PK, manufactured by Fuji Impulse Co., Ltd.) is applied. A packaging bag of Comparative Example 6 was produced by heat-sealing on three sides to form a heat-sealed portion with a width of 10 mm. The heat sealing conditions were set to 5.5 for the setting scale of the seal, and 2 seconds for the pressurization/heating time. Here, by not heat-sealing one side of the film in the feed direction, a packaging bag having one side in the feed direction as an opening was obtained.
The bag size (inner dimensions) of the resulting packaging bag was 240×290 mm, and 15 through-holes per packaging bag were provided on the inner surface of the packaging bag (excluding the heat-sealed portion). It was confirmed that In addition, when the surface of the packaging bag is viewed from above, the shape of the through-hole provided in the obtained packaging bag is the side having the opening shape of the opening constituting the through-hole and the shape of the through-hole. It was confirmed to be an oval shape having a major axis extending in a direction in which the angle formed with the major axis direction is 0 degrees or more and 45 degrees or less. In addition, the equivalent perfect circle diameter (average value of 15 holes) of the through-holes provided in the obtained packaging bag was as shown in Table 1 below.

In this comparative example, perforation was performed by the following method. The conditions shown in Table 1 below were adopted as perforation conditions such as the film feeding speed, the incident angle of the laser beam with respect to the film, and the oscillation speed of the laser irradiation device.
First, a roll having a diameter of 318 mm and a width of 850 mm was provided with a rotary support roll having five grooves of 30 mm width and 5 mm depth at intervals of 100 mm from positions 150 mm from both ends. On the other hand, a carbon dioxide gas laser with an output of 150 watts was prepared as a laser irradiation device. Each of these five laser irradiation devices was installed so that the laser irradiation position corresponded to the position of the groove of the rotating support roll. In addition, the laser irradiation device was installed so that the distance from the film was 12 mm.

Next, using the apparatus shown in FIGS. 1 and 2, the film was run on the rotating support roll by rotating the rotating support roll at a peripheral speed of 100 m/min. Next, without rotating each laser irradiation device, a pulse laser was irradiated 10 times per second from a direction perpendicular to the running film. At this time, a nitrogen gas pressure of 1.0 kg/cm ² (gauge pressure) was applied to the compressed gas introduction path, and the nitrogen gas was blown along the laser beam from the tip of the nozzle during laser irradiation.

Next, using the packaging bags of Examples 1 to 6 and Comparative Examples 1 to 6, green soybeans, shiitake mushrooms, green plums, and broccoli as fruits and vegetables are individually sealed in the packaging bags to produce packages containing fruits and vegetables. bottom. Specifically, the following packages containing fruits and vegetables were produced. Green soybeans are a typical example of fruits and vegetables that show average amounts of respiration and transpiration per unit weight among various fruits and vegetables. Among various fruits and vegetables, shiitake mushrooms are a representative example of fruits and vegetables that have a large amount of transpiration per unit weight. Unripe plums are a typical example of fruits and vegetables that have a high respiration rate per package, among various fruits and vegetables. Among various fruits and vegetables, broccoli is a representative example of fruits and vegetables having a large respiration rate per unit weight.

Green soybean-containing packages according to Examples 1 and 4 and Comparative Examples 1 and 4 were produced by sealingly packaging 250 g of green soybeans in the inner spaces of the packaging bags according to Examples 1 and 4 and Comparative Examples 1 and 4, respectively. .
Packages containing shiitake mushrooms according to Examples 2 and 6 and Comparative Examples 2 and 6 were produced by sealingly packaging 120 g of shiitake mushrooms in the inner spaces of the packaging bags according to Examples 2 and 6 and Comparative Examples 2 and 6, respectively. . Further, by sealingly packaging 280 g of shiitake mushrooms in the inner space of the packaging bag according to Example 1, a shiitake-containing package according to Example 1 was also produced.
Packages containing green plums according to Example 3 and Comparative Example 3 were produced by sealingly packaging 1000 g of green plums in the inner spaces of the packaging bags according to Example 3 and Comparative Example 3, respectively. Further, by sealingly packaging 260 g of green plums in the inner space of the packaging bag according to Example 1, a package containing green plums according to Example 1 was also produced.
Broccoli-containing packages according to Example 6 and Comparative Example 6 were produced by sealingly packaging 400 g of broccoli in the internal spaces of the packaging bags according to Example 6 and Comparative Example 6, respectively. In addition, by sealingly packaging 375 g of broccoli in the inner space of the packaging bag according to Example 1, a broccoli-containing package according to Example 1 was also produced.

The package was stored at 20° C. for 3 days, and the fruits and vegetables housed in the inner space were tracked for quality changes in terms of appearance, odor, wilting, taste, and the like. Evaluation criteria are as follows.
◯: Good quality.
Δ: Practically no problem in quality, but slight deterioration was confirmed.
x: Deterioration was confirmed to some extent causing problems in practice.

In addition, the appearance shape of the through-hole provided in each package used for tracking the quality change of the fruits and vegetables was compared with the appearance shape of the through-hole provided in each package before tracking the quality change of the fruits and vegetables. , the shape stability of the through-hole was evaluated according to the following criteria.
◯: It was confirmed that the appearance shape of the through-hole was the same as before tracking the change in quality of the fruits and vegetables.
Δ: Although there is no practical problem in the appearance of the through-hole, it was confirmed that there was a very slight change compared to before tracking the change in the quality of the fruits and vegetables.

The evaluation results regarding the above evaluation items are shown in Table 1 below.

As shown in Table 1 above, the packaging film produced by the method of each example can stably maintain the freshness of fruits and vegetables for a long period of time by being formed into a packaging bag, and It was confirmed to be excellent in durability stability during use.

1 Unwinding roll 2 Resin film 3 Laser irradiation device 4 Rotating support roll 5 Winding roll 6 Guide roll 7 Floating roll 8 Compressed gas introduction path 9 Nozzle tip 10 Pulse laser 11 Light guide path 12 Output optical part (lens)
13 conical beam 14 hole

Claims (16)

preparing a resin film;
A step of drilling through holes in the resin film by irradiating the resin film with a laser irradiation device;
including
In the step of forming the through-holes, the laser irradiation device is rotated in the width direction of the resin film perpendicular to the feeding direction of the resin film so that the incident angle of the laser light with respect to the surface of the resin film varies. A method for manufacturing a packaging film, wherein the through holes are punched while being swung and rotated. 2. The method for producing a packaging film according to claim 1, wherein the minimum incident angle of the laser beam in the step of forming the through holes is 30[deg.] or more and less than 90[deg.] with respect to the surface of the resin film. The value of v2/v1 is 1.5 or more, where v1 is the feeding speed of the resin film in the step of punching the through-holes, and v2 is the oscillation speed of the laser irradiation device in the step of punching the through-holes. 3. The method for producing a packaging film according to claim 1 or 2, which is 20 or less. The method for manufacturing a packaging film according to any one of claims 1 to 3, wherein in the step of forming the through holes, the through holes are formed such that the through holes have an equivalent perfect circle diameter of 150 µm or more and 470 µm. . The method for producing a packaging film according to any one of claims 1 to 4, wherein the laser irradiation device is a carbon dioxide laser irradiation type laser irradiation device. The laser irradiation device includes a rotating support roll that supports the resin film on the opposite side of the laser incident surface of the resin film on which the laser is incident,
In the step of forming the through-hole, the through-hole is formed by irradiating the laser beam on a surface opposite to the laser incident surface at a position where the rotating support roll and the resin film are not in contact with each other. The manufacturing method of the packaging film according to any one of claims 1 to 5. A method for producing a packaging film, wherein the packaging film obtained by the method for producing a packaging film according to any one of claims 1 to 6 is used as a food freshness-keeping packaging bag or a food freshness-keeping packaging container for containing food. 8. The method for producing a packaging film according to claim 7, wherein the food is fruits and vegetables. A method for manufacturing a packaging bag using the packaging film obtained by the method for manufacturing a packaging film according to any one of claims 1 to 8,
A method for manufacturing a packaging bag, comprising the step of heat-sealing the packaging film provided with two or more through-holes so as to leave one side in the feed direction as an opening to form the bag. 10. The method of manufacturing a packaging bag according to claim 9, wherein in the bag-making step, the resin film is made so that two or more of the through-holes do not overlap each other. 11. A method of manufacturing a packaging bag, wherein the packaging bag manufactured by the method of manufacturing a packaging bag according to claim 9 or 10 is used as a food freshness-preserving packaging bag for containing food. 12. The method of manufacturing a packaging bag according to claim 11, wherein the food is fruits and vegetables. A method for manufacturing a packaging container using the packaging film obtained by the method for manufacturing a packaging film according to any one of claims 1 to 8,
A method for manufacturing a packaging container, comprising the step of forming the packaging film provided with two or more through-holes. A method for producing a lid material using the packaging film obtained by the method for producing a packaging film according to any one of claims 1 to 8,
including a step of forming the packaging film provided with two or more of the through-holes;
A method for manufacturing a lid material, wherein the lid material is used for sealing a packaging container. Food is contained in a packaging bag obtained by the method for manufacturing a packaging bag according to any one of claims 9 to 12, or a packaging container obtained by the method for manufacturing a packaging container according to claim 13. A method for manufacturing a package, comprising steps. A method for manufacturing the package according to claim 15,
A method for producing a package, wherein the food is fruits and vegetables.

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