JP2010076826A - Deoxidant packing film and packing bag for deoxidant - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a deoxidant packing film and a packing bag for deoxidant which, although having oxygen permeability, can intercept circulation of other components. <P>SOLUTION: The deoxidant packing film is formed of a laminate film obtained by laminating a first film layer made of a plastic film, a nonwoven fabric, and a second film layer made of a plastic film. The first film layer comprises a plastic film made of a porous film having a thickness of 5 μm to 3 mm and also having closed holes, wherein the plastic film has the thickness of 10 μm or less at the thinnest part in the closed holes and has 500 to 200,000 pieces/cm<SP>2</SP>in density of the closed holes having average opening widths of 0.5 to 300 μm. The second film layer comprises a perforated polyethylene film and is arranged on the outside of the first film layer. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a laminated film, and more particularly to a film for packaging oxygen absorbers and a packaging bag for oxygen absorbers for packaging oxygen absorbers.

  In order to prevent quality deterioration due to oxidation or the like of stored products when storing foods, pharmaceuticals, precision machine parts, metal powders, etc., a technology for making the inside of the packaging material for storing these products oxygen-free has become widespread. At this time, an oxygen scavenger that removes oxygen in the storage atmosphere is used enclosed in the packaging material.

  An oxygen scavenger removes oxygen in the atmosphere by absorbing oxygen present in the atmosphere, and is in the form of powder, tablets, resin, etc., and is wrapped with a packaging material having oxygen permeability. And use. As this oxygen scavenger, generally used is an iron oxygen scavenger containing a reduced iron powder as a main component and a metal donating compound such as metal halide such as sodium chloride, activated carbon and water.

Japanese Unexamined Patent Publication No. 53-50065

  Here, in addition to oxygen permeability, the oxygen-absorbing agent packaging material is required to have characteristics that can be used in a storage environment unique to stored products. For example, if moisture contained in the oxygen scavenger leaks to the outside of the packaging material, food such as seaweed, foods that dislike moisture, pharmaceuticals such as granules and tablets, precision mechanical parts such as IC, metal powder such as copper powder, etc. This is because the quality of the product may change due to leaked moisture.

  Regarding packaging of such an oxygen scavenger, for example, in the method for adjusting the reaction speed of an oxygen scavenger disclosed in Patent Document 1, an envelope film formed by laminating and bonding two types of perforated films having different oxygen gas permeability A technique for adjusting the oxygen permeation amount without impairing the water resistance, chemical resistance, etc. of the outer film is disclosed. However, in the encapsulating film disclosed in Patent Document 1, since the holes of the plastic film close to the outside penetrate, when the oxygen scavenger raw material retaining moisture is packaged, the moisture contained in the oxygen scavenger penetrates. Leak out of the packaging through the hole. For this reason, in the above-mentioned preserved products such as foods that dislike moisture such as laver, there is a possibility that the quality may change due to leaked moisture. On the other hand, when the oxygen absorber using the encapsulated film disclosed in Patent Document 1 is used for preserving foods with high moisture content, the moisture on the stored product side penetrates into the inside through the through holes, and the oxygen absorber The inside will be excessively watery and will lose its ability to deoxygenate. Furthermore, a slight iron rust odor of the oxygen scavenger leaks from the through-hole, and there is a possibility that the iron rust odor is adsorbed on foods such as Japanese tea and foods that dislike odors or foods that easily adsorb odors.

  From the above, it is desired that a packaging material for packaging an oxygen scavenger is not only excellent in oxygen permeability but also excellent in moisture and oxygen barrier component blocking properties. Accordingly, an object of the present invention is to provide an oxygen scavenger packaging film and an oxygen scavenger packaging bag that can block the flow of other components while having oxygen permeability.

  As a result of the study, the present inventors have found that the above problem can be solved by using the laminated film shown below, and have reached the present invention.

That is, the oxygen scavenger packaging film according to the present invention is a laminated film in which a first film layer made of a plastic film, a nonwoven fabric, and a second film layer made of a plastic film are laminated, and the first film layer Is made of a porous film having a thickness of 5 μm to 3 mm and having non-through holes, and the thickness of the thinnest part of the film in the non-through holes is 10 μm or less, and the average It consists of a plastic film having an opening width of 0.5 μm to 300 μm at a density of 500 / cm ^{2 to} 200,000 / cm ² , the second film layer is composed of a perforated polyethylene film, and the first film layer Is used so as to be arranged on the outside.

  In the oxygen scavenger packaging film according to the present invention, it is more preferable that the first film layer has the non-through holes opened on the nonwoven fabric side.

The oxygen scavenger packaging film according to the present invention, the second film layer has a thickness of 5Myuemu～3mm, 9 pieces of through-holes of diameter 0.1 mm to 3 mm ^/ cm 2 to 100 pieces / cm ² What consists of a plastic film provided with the density of is more preferable.

  In the oxygen scavenger packaging film according to the present invention, more preferably, the nonwoven fabric is any one of paper, water-resistant and oil-resistant paper, and polyolefin nonwoven fabric.

  The oxygen scavenger packaging bag according to the present invention uses the oxygen scavenger packaging film described above.

  The oxygen scavenger packaging film according to the present invention can obtain excellent oxygen permeability without penetrating holes in the thickness direction of the film. Therefore, since moisture does not flow inside and outside the oxygen scavenger packaging material, the oxygen scavenging ability of the oxygen scavenger is not reduced. Moreover, since the oxygen scavenger packaging bag according to the present invention is composed of the oxygen scavenger packaging film having the above-described effects, the oxygen scavenger packaging bag having excellent oxygen permeability and moisture barrier properties is provided. Can be provided.

  Hereinafter, the best mode for carrying out the present invention will be described.

Oxygen absorber packaging film: The oxygen absorber packaging film according to the present invention is a laminated film in which a first film layer made of a plastic film, a nonwoven fabric, and a second film layer made of a plastic film are laminated. And a 1st film layer has a thickness of 5 micrometers-3 mm, consists of a porous film provided with a non-through hole, and the thickness of the thinnest part of the film in a non-through hole is 10 micrometers or less And an average opening width of 0.5 μm to 300 μm is made of a plastic film having a density of 500 pieces / cm ^{2 to} 200,000 pieces / cm ² , and the second film layer is made of a perforated polyethylene film Thus, the first film layer is used so as to be arranged on the outer side.

  The first film layer is preferably a plastic film having the following conditions. First, it consists of a porous film having a thickness of 5 μm to 3 mm and having non-through holes. The term “non-through hole” as used herein refers to an opening formed on one side of the film without penetrating in the thickness direction of the film. And, by forming the non-through hole, the thickness of the film is reduced at the portion of the non-through hole, and the portion of the non-through hole where the film is thinnest is the thinnest part. . The opening shape of the non-through hole is not particularly limited.

In the first film layer, the thickness of the thinnest part of the film in the non-through holes is 10 μm or less, and 500 / cm ^{2 to} 200,000 non-through holes having an average opening width of 0.5 μm to 300 μm. A plastic film with a density of / cm ² is preferred.

  When the thickness of the first film layer is less than 5 μm, it is difficult to form a non-through hole. On the other hand, if the thickness of the first film layer exceeds 3 mm, it is too thick as a laminated film for use in a packaging bag for oxygen scavengers, and a thin oxygen scavenger is desired.

Next, when the thickness of the thinnest part of the film in the non-through hole is greater than 10 μm, the oxygen permeability decreases. The average opening width of the non-through holes is preferably 0.5 μm to 300 μm. This average opening width represents the average value of the measurement results obtained by measuring the widest opening portion of each non-through hole. If the average opening width of the non-through holes is less than 0.5 μm, sufficient oxygen permeability cannot be obtained. On the other hand, when the average opening width of the non-through holes exceeds 300 μm, the number of non-through holes per 1 cm ² decreases, and unevenness in oxygen permeability tends to occur.

Further, the first film layer preferably has non-through holes at a density of 500 / cm ^{2 to} 200,000 / cm ² . When the number of non-through holes per 1 cm ² is less than 500, the number of non-through holes is reduced, and unevenness in oxygen permeability tends to occur. On the other hand, if the number of non-through holes per 1 cm ² exceeds 200,000, the number of non-through holes is too large and it is difficult to adjust oxygen permeability.

  This first film layer is arranged and used on the outside when packaging the oxygen scavenger. Since the 1st film layer is provided with a non-through hole, it does not permeate other ingredients, such as moisture, while ensuring oxygen permeability. Therefore, when it is set as the packaging bag for oxygen absorbers, the outermost layer can block | circulate the distribution | circulation of the substance which comprises an oxygen absorber by arrange | positioning the said 1st film layer on the outer side.

  The material of the first film layer is a resin film made of polyolefin, polyester, polyvinyl chloride, polyamide, polycarbonate, polyimide, fluororesin, polyether ether ketone, polyether ketone, elastomer, polyurethane, or the like. A laminated film in which two or more layers are laminated can be used. When a laminated film is used as the first film layer, for example, a laminate of a polyethylene terephthalate film and a polypropylene film, a laminate of a polyethylene terephthalate and a polyethylene film, and the like can be given.

  The oxygen scavenger packaging film according to the present invention includes the first film layer in which non-through holes are formed. Therefore, when the oxygen scavenger packaging bag is used, oxygen permeation can be performed inside and outside the oxygen scavenger packaging bag. Distribution of moisture and the like can be prevented while obtaining properties. For this reason, the moisture contained in the oxygen scavenger raw material and the moisture contained in the stored product side do not permeate the oxygen scavenger packaging film. As a result, the performance of the oxygen scavenger is not deteriorated, and a preserved product stored using the oxygen scavenger can be prevented from being affected by moisture.

Next, the second film layer will be described. The second film layer is preferably a perforated polyethylene film. The second film layer has a thickness in the range of 5 μm to 3 mm, and has a substantially circular through hole with a diameter of 0.1 mm to 3 mm at a density of 9 / cm ^{2 to} 100 / cm ^2. preferable. When the thickness of the second film layer is less than 5 μm, it is too thin as a perforated polyethylene film and lacks handleability when the films are laminated. On the other hand, even if the thickness of the second film layer exceeds 3 mm, the material permeability is not improved, but rather the overall thickness of the laminated film is increased, and a thin oxygen scavenger is desired. Not suitable for. Next, when the through-hole of the second film layer has a diameter of less than 0.1 mm, sufficient oxygen permeability cannot be obtained. On the other hand, when the number of through holes in the second film layer exceeds 3 mm in diameter, the number of non-through holes per 1 cm ² decreases, and oxygen permeability decreases. Further, the more preferable ones include a density of 9 ^/ cm 2 to 100 pieces / cm ² through-holes, the number of through-holes is less than 9 / cm ^2, unevenness is generated in the oxygen permeability. On the other hand, when the number of through-holes exceeds 100 / cm ² , the oxygen permeation amount becomes excessive, and a suitable reaction rate cannot be obtained, and the shape stability of the second film layer is not excellent.

  And the oxygen absorbent packaging film according to the present invention provides a layer made of a nonwoven fabric between the first film layer and the second film layer. By providing the nonwoven fabric, the shape stability of the entire laminated film can be obtained, and oxygen and moisture can be retained by the nonwoven fabric. More preferably, the nonwoven fabric is one of paper, water-resistant and oil-resistant paper, and polyolefin nonwoven fabric. Examples thereof include paper such as kraft paper, water- and oil-resistant paper obtained by mixing polyethylene, polypropylene, and the like with the paper, polyolefin nonwoven fabric made of polyethylene, polypropylene, and the like.

  As a bonding method between the first film layer / nonwoven fabric / second film layer in the oxygen scavenger packaging film, dry lamination, heat lamination, or the like can be used.

  Here, since the film for oxygen scavenger packaging according to the present invention has a configuration in which the first film layer does not have a through-hole in order to limit substance permeability other than oxygen, the outermost layer is a perforated film. Compared to the case, the transmission efficiency of oxygen transmitted from the outer surface is lowered. Therefore, the first film layer secures oxygen permeability by forming a non-through hole on one side and adjusting the thickness of the thinnest part. The non-through hole forming surface of the first film layer may be disposed toward the outer side or the nonwoven fabric side. However, in the oxygen scavenger packaging bag, it is important to efficiently distribute oxygen that has permeated from the outside into the oxygen scavenger packaging bag. Therefore, when laminating the first film layer and the nonwoven fabric, it is more preferable to laminate the surface of the first film layer where the non-through holes are formed and the nonwoven fabric. That is, the surface of the first film layer on which the non-through holes are formed has a larger surface area, and the non-through hole forming surface of the first film layer is disposed on the nonwoven fabric side, so that the oxygen non-woven fabric side transmitted from the outside It is easy to diffuse into the oxygen absorber, and can be diffused efficiently into the oxygen scavenger packaging bag.

  The oxygen scavenger packaging film according to the present invention is a plastic film that has sufficient oxygen permeability by laminating a perforated polyethylene film and a non-woven fabric, and has a non-through hole in the first film layer as the outermost layer. Since a hole does not penetrate in the thickness direction of the laminated film, the permeation of moisture and other substances other than oxygen can be prevented while maintaining oxygen permeability.

The oxygen scavenger packaging bag according to the present invention: The oxygen scavenger packaging bag according to the present invention uses the oxygen scavenger packaging film described above. The shape and size of the oxygen scavenger packaging bag are not particularly limited, and may be designed as appropriate according to the application, as long as the oxygen scavenger can be sealed by sealing the end. For example, two oxygen scavenger packaging films cut into a desired shape are opposed to each other on the second film layer side, and a part of them is pasted together, or one oxygen scavenger packaging film There is an example in which a bag is formed by bending a central portion and sealing a portion of the remaining end portion.

  Hereinafter, the present invention will be described more specifically with reference to examples. Note that the present invention is not limited to the following examples.

FIG. 1 is a schematic view showing a configuration of an oxygen scavenger packaging film 1 in Examples. The constituent material of each layer of the film 1 for oxygen scavenger packaging of an Example is shown. As the first film layer 4, a biaxially stretched polypropylene (OPP) film having a film thickness of 20 μm and non-through holes 7 formed at a density of 10,000 holes / cm ² was used. The non-through hole 7 has an opening width 7a of 10 μm. The thickness of the thinnest portion 8 of the film in the non-through hole 7 was 5 μm.

  The nonwoven fabric 5 was a stretched low density polyethylene (LLDPE) spunbond nonwoven fabric.

As the second film layer 6, a stretched low density polyethylene (LLDPE) film having a thickness of 20 μm in which fine through holes 9 having a diameter of 0.5 mm were formed at a density of 50 / cm ² was used.

  The constituent materials of the respective layers were laminated. First, the biaxially stretched polypropylene film 4 as the first film layer and the stretched low density polyethylene (LLDPE) spunbond nonwoven fabric 5 were pattern dry laminated to obtain a composite film. Then, the said composite film and the extending | stretching low density polyethylene film 6 which is a 2nd film layer were laminated | stacked, and it was made to adhere | attach with an adhesive agent, and it was set as the film 1 for oxygen absorber packaging.

  The oxygen scavenger packaging film 1 is cut to a width of 4 cm and a length of 10 cm, and the second film layer 6 side is folded as an inner layer so that the size becomes 4 cm × 5 cm. One side of the side was opened, and this was designated as oxygen scavenger packaging bag 2.

  The oxygen scavenger packaging bag 2 was charged with 3.0 g of an iron-based oxygen scavenging raw material 10 mainly composed of iron powder, activated carbon and salt, and the opening was sealed by heat sealing to obtain oxygen scavenger A. .

This oxygen scavenger A was mounted and tested. That is, the oxygen scavenger A was sealed in a plastic film bag with an oxygen permeation amount of 5 ml / m ² · day together with 10 pieces of grilled laver (plate nori). After storing at 25 ° C. for 1 month, the plastic film bag was opened and the baked laver was sampled. As a result, the taste did not deteriorate due to oxygen, and the crispness was not lost, and the quality was not deteriorated.

Comparative example

  FIG. 2 is a schematic view showing the structure of the oxygen scavenger in the comparative example. The comparative example used a film having the following layer structure.

As the first film layer 101, biaxially oriented polypropylene (OPP) having a thickness of 20 μm in which fine through holes 104 having a diameter of 0.2 mm are formed at a density of 50 / cm ² is used. 102 was laminated and bonded to form a composite film. As the second film layer 103, a stretched low density polyethylene (LLDPE) film having a thickness of 20 μm in which fine through holes 105 having a diameter of 0.5 mm were formed at a density of 50 / cm ² was prepared. The composite film and the second film layer 103 were laminated and bonded to obtain a laminated film 100.

  The laminated film 100 is cut into a width of 4 cm and a length of 10 cm, and is bent with the second film layer 103 side inward so that it becomes 4 cm × 5 cm. A packaging bag B was obtained.

  This oxygen scavenger packaging bag B was filled with 3.0 g of the same iron-based oxygen scavenging raw material 10 as in the example, and the opening was sealed by heat sealing to obtain oxygen scavenger B.

This oxygen scavenger B was tested in the same manner as in Example 1. That is, the oxygen scavenger B was sealed in a plastic film bag with an oxygen permeation amount of 5 ml / m ² · day together with 10 pieces of grilled seaweed (plate nori). After storing at 25 ° C for 1 month, opening the plastic film bag and tasting the grilled laver, there was no loss of taste due to oxygen, but the crispness was lost, there was a moist feeling, the quality deteriorated I felt it.

  Since the film for packaging oxygen absorber according to the present invention has oxygen permeability without having a hole penetrating in the thickness direction of the film, it can transmit oxygen and prevent transmission of moisture and the like. This oxygen scavenger packaging film uses oxygen scavenger packaging foods such as dried seaweed seaweed and other foods, foods that do not like seaweed seaweed, pharmaceuticals such as granules and tablets, precision ICs, etc. It is preferably used when storing machine parts, metal powders such as copper powder, etc. in an oxygen-free state.

It is the schematic which shows the structure of the oxygen scavenger in an Example. It is the schematic which shows the structure of the oxygen absorber in a comparative example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Oxygen absorber packaging film 2 Oxygen absorber packaging bag 4 1st film layer 5 Nonwoven fabric 6 2nd film layer 7 Non-through hole 8 Thinnest part 9 Through hole

Claims (5)

A laminated film in which a first film layer made of a plastic film, a nonwoven fabric, and a second film layer made of a plastic film are laminated,
The first film layer has a thickness of 5 μm to 3 mm and is made of a porous film having non-through holes, and the non-through holes have a thickness of the thinnest part of the film in the non-through holes of 10 μm or less. And comprising a plastic film having an average opening width of 0.5 μm to 300 μm at a density of 500 pieces / cm ^{2 to} 200,000 pieces / cm ² ,
The second film layer is made of a perforated polyethylene film,
A film for oxygen scavenger packaging, characterized in that the first film layer is disposed on the outside. The oxygen-absorbing agent packaging film according to claim 1, wherein the first film layer has the non-through holes opened to the nonwoven fabric side. The second film layer has a thickness of 5 μm to 3 mm,
The oxygen-absorbing agent packaging film according to claim 1 or 2, comprising a plastic film having through holes having a diameter of 0.1 mm to 3 mm at a density of 9 / cm ^{2 to} 100 / cm ² . The oxygen-absorbing agent packaging film according to any one of claims 1 to 3, wherein the nonwoven fabric is any one of paper, water-resistant and oil-resistant paper, and polyolefin nonwoven fabric. An oxygen scavenger packaging bag using the oxygen scavenger packaging film according to claim 1.

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