JP2016047737A - Packaging material for deoxygenating agent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide packaging material for a deoxygenating agent having excellent permeability/concealment/base strength, having low reduction in permeability and low unevenness in oil proof upon an oil resistant agent is applied, and having excellent fixing property of the oil resistant agent.SOLUTION: There is provided a laminated product in which, on both surface of synthetic pulp mixed paper 2 in which multi branch synthetic pulp comprising polyolefine resin as a main component is used, nonwoven fabrics 3,4 containing polyolefine resin are arranged. By using packaging material 1 for a deoxygenating agent produced by melting attachment between layers in laminated product, packaging material 1 for deoxygenating agent may be provided, having excellent permeability/concealment/base strength, having low reduction in permeability and low unevenness in oil proof upon an oil resistant agent is applied, and having excellent fixing property of the oil resistant agent.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an oxygen scavenger packaging material used for an oxygen scavenger used for maintaining freshness or quality of foods, pharmaceuticals, and the like.

  Oxygen scavengers are currently used in a wide range of applications from food to pharmaceuticals, and their main uses are to prevent the oxidation and decay of contents and the control of insects and bacteria by deoxygenation in the package. . As an example of the principle of deoxygenation, a food product in which a deoxidant packaged with a breathable packaging material, which is a reduced iron oxide powder added with an oxidation accelerator such as a metal halide salt, is wrapped with a film or the like. By putting it in the package, the reduced iron oxide powder causes an oxidation reaction to absorb oxygen remaining in the food package. The types of oxygen scavengers are self-reactive type that reacts directly with oxygen, moisture reaction type in which water contained in food triggers oxidation reaction, type that absorbs oxygen and carbon dioxide gas at the same time, oxygen absorption There are various types of oxygen scavengers depending on the intended use, such as a type that absorbs moisture simultaneously.

  Next, the required performance of oxygen scavenger packaging materials used for oxygen scavengers is listed. Having adequate air permeability to pass gas such as oxygen, oxygen scavenger packaging materials are damaged, reduced iron oxide powder, etc. Oxygen absorbers have adequate base strength so that they do not leak into the food, and the oil contained in the food penetrates into the oxygen scavenger packaging material, resulting in reduced breathability, base strength, concealment, etc. For example, it has oil resistance so as not to occur, and has a suitable concealing property so that the contents of the oxygen scavenger are not visible. The required performance of the oxygen scavenger packaging material is selectively determined according to the state, application, and required quality of the package contents.

  As a conventional oxygen scavenger packaging material, a paper-making process using a paper base material excellent in air permeability coated with an oil-resistant agent, or a raw material made of synthetic pulp and synthetic fiber as in Patent Document 1 In addition, a product in which an oil-resistant agent is added, or a product obtained by laminating a porous film made of a thermoplastic resin between a non-woven breathable microporous membrane and a non-woven fabric as in Patent Document 2, and the like are proposed. ing.

Japanese Patent Application Laid-Open No. Sho 62-156397 Japanese Utility Model Publication No. 2-25623

  However, when an oil-resistant agent is applied on a paper base, the density of the paper base is relatively high, so that the oil-resistant agent does not easily penetrate into the paper base, and the oil-resistant layer is formed only on the surface layer portion of the paper base. Since the oil-proofing agent has no adhesiveness at all, the fixing strength between the paper base and the oil-resistant layer is very weak, and the oil-resistant coating film falls off when the packaging material for the oxygen absorber is folded. There has been a problem of a significant drop. In addition, paper base materials originally have poor base strength, such as tear strength, so base materials are easily damaged, and problems such as reduced oil resistance and content leakage due to base material damage are likely to occur. .

  In addition, since the oxygen scavenger packaging material of Patent Document 1 contains the oil resistant agent uniformly throughout the base material made of synthetic pulp mixed paper, it has excellent breathability and oil resistance, and the oil resistant agent coating film is removed by bending or the like. However, in order to have the same oil resistance as compared to the type of oxygen scavenger packaging material with the oil resistant agent applied to the surface layer of the base material, it is necessary to add a large amount of oil resistant agent and the production cost is high. Furthermore, although the base material strength was improved by using synthetic pulp and synthetic fiber as the raw material of the base material compared to the paper base material using only natural pulp, it was not at a sufficiently satisfactory level. .

  Moreover, the packaging material for oxygen scavengers of Patent Document 2 comprises a laminated body in which a porous film made of a thermoplastic resin is sandwiched between a breathable microporous membrane and a non-woven fabric, and bonded by fusion bonding, While the base material strength is sufficiently secured and has excellent performance in air permeability, oil resistance and base material strength, in order to have a certain level of air permeability, the diameter of the hole in the microporous membrane is considerably large As a result, the strength of the substrate and the delamination strength between the microporous membrane and the non-woven fabric are reduced. There arises a problem that air permeability and concealment are lowered. On the production side, it is necessary to prepare microporous membranes and perforated films with different hole sizes according to the required quality of the oxygen scavenger, or to paste the microporous membrane, perforated film and nonwoven fabric together. There is a problem in that the manufacturing process increases because there is a difficulty in processing such that the pore size of the perforated film varies depending on the conditions at the time of combination and the air permeability and oil resistance are not stable.

  The present invention has been made in view of such a situation, and is excellent in air permeability, concealability and substrate strength, has less deterioration in air permeability and variation in oil resistance when an oil resistant agent is applied, and is oil resistant. It is an object of the present invention to provide a packaging material for an oxygen scavenger that has excellent fixability of the agent.

  In order to solve these problems, the present inventor is a laminate in which a nonwoven fabric containing a polyolefin resin is arranged on both sides of a synthetic pulp mixed paper using a multi-branched synthetic pulp mainly composed of a polyolefin resin. In addition, by using a packaging material for oxygen scavengers created by melt bonding the layers of the laminate, it has excellent breathability, concealment, and substrate strength, and decreases breathability when an oil resistant agent is applied. It is possible to provide a packaging material for oxygen scavengers that has little variation in oil resistance and excellent oil resistance.

  Furthermore, the inventor can improve the concealability while maintaining the air permeability by setting the content ratio of the multi-branched synthetic pulp in the synthetic pulp mixed paper to a range of 70 to 100% by mass. did.

  Furthermore, the inventor made the packaging material for oxygen scavengers while maintaining the air permeability of the packaging material for oxygen scavengers by making the content of the polyolefin resin in the nonwoven fabric in the range of 30 to 100% by mass. It was possible to improve the melt adhesiveness of the laminate to be constructed and the base material strength of the oxygen scavenger packaging material.

  Furthermore, the inventor maintains the breathability and concealment of the oxygen-absorbing agent packaging material by using a core-sheath composite fiber as a main raw material, a sheath part made of a polyolefin resin, and a core part made of a polyester resin. However, the melt adhesion of the laminate constituting the oxygen scavenger packaging material and the substrate strength of the oxygen scavenger packaging material can be further improved.

Furthermore, the inventors set the density of the oxygen scavenger packaging material in the range of 0.30 to 0.60 g / cm ³ and the air permeation resistance according to the Gurley tester method of JIS P8117: 2009 in the range of 10 to 1000 seconds. It is possible to have the effect of suppressing the dispersion of oil resistance when applying oil resistance agent while maintaining concealment performance and base material strength while having excellent breathability by designing limited to did.

  Furthermore, the inventor applied a fluorine-based oil resistant agent mainly composed of a perfluoroalkyl compound to one of the surfaces of the oxygen scavenger packaging material of the present invention. TAPPI paper pulp test method no. By setting the kit value at 41: 2000 to 12 or more, it was possible to give the oxygen-absorbing agent packaging material excellent oil resistance. In addition, by using the oxygen scavenger packaging material of the present invention, the oil resistant agent is firmly fixed to the oxygen scavenger packaging material and does not cause problems such as the oil resistant coating film falling off. It is possible to suppress the deterioration of oil resistance and further suppress the dispersion of oil resistance.

  According to the present invention, an oxygen scavenger that has excellent breathability, concealment, and substrate strength, has less deterioration in breathability and variation in oil resistance when an oil resistant agent is applied, and has excellent fixability of the oil resistant agent. Packaging materials can be provided.

It is typical sectional drawing which shows an example of the packaging material for oxygen absorbers which concerns on embodiment of this invention. It is typical sectional drawing which shows an example of the packaging material for oxygen absorbers which concerns on embodiment of this invention. It is typical sectional drawing which shows an example of the oxygen absorber using the packaging material for oxygen absorbers of this invention.

  As shown in FIG. 1, a packaging material 1 for oxygen scavenger according to the present invention comprises a nonwoven fabric 3 containing an olefinic resin on both sides of a synthetic pulp mixed paper 2 using a multi-branched synthetic pulp mainly composed of an olefinic resin. And the laminated body which has arrange | positioned the nonwoven fabric 4, Comprising: It has the structure formed by melt-bonding the interlayer of a laminated body.

  The method of melt bonding the laminate is not particularly limited, but a method of uniformly melting and bonding the entire surface with a calender roll, a method of partially melting and bonding with a heat roll engraved with a specific uneven pattern, or a heat oven And a method of melt-bonding using an ultrasonic welder, etc., and each processing method may be appropriately selected and used according to the required quality of the oxygen-absorbing agent packaging material.

  Further, when the required quality of oil resistance is required for the oxygen scavenger packaging material 1, an oil resistance agent may be applied to one surface of the oxygen scavenger packaging material 1 shown in FIG. When the oil resistant agent is applied to the oxygen scavenger packaging material 1 of the present invention, the oil resistant agent penetrates into the nonwoven fabric 3 having a relatively low density, as shown in FIG. The oil-resistant layer 5 is formed in such a manner that the permeation of the oil-resistant agent stops near the boundary surface between the synthetic pulp mixed paper 2 and the nonwoven fabric 3.

  FIG. 3 shows an example of the oxygen scavenger 9 using the oxygen scavenger packaging material 1 of the present invention. A sealant layer 6 mainly composed of EVA resin or the like is disposed between the oxygen scavenger packaging material 1 and the vapor-deposited aluminum PET film 7, and constant from the end between the oxygen scavenger packaging material 1 and the sealant layer 6. A deoxygenating agent 9 is completed by preparing a laminate in which a necessary amount of oxygen absorbent 8 is weighed and arranged in a central portion that is far away, and melt bonding the whole or ends thereof.

(Synthetic pulp mixed paper)
As a raw material of the synthetic pulp mixed paper in the present invention, a multi-branched synthetic material mainly comprising a polyolefin resin having a bulky three-dimensional network structure prepared by a polymerization precipitation method, a flash spinning method, a fibrid method, or a cooling precipitation method. It is preferable to use pulp. The polyolefin-based resin is not particularly limited, but may be appropriately selected from polyethylene resin, polypropylene resin, poly α-olefin resin, a copolymer or a modified product thereof, and the like, more preferably. It is desirable to use polyethylene resin. By using a multi-branched synthetic pulp mainly composed of a polyolefin resin, it is possible to produce a paper excellent in air permeability, concealment and substrate strength. Since the multi-branched synthetic pulp has a three-dimensional network structure in which fibers with different fiber diameters are branched into branches, concealment to prevent the reduced iron oxide powder, which is the content of the oxygen scavenger, from being seen through In addition, the supplemental property of fine particles of reduced iron oxide powder is also excellent. Furthermore, it is possible to adjust the degree of crushing of the three-dimensional network structure and the degree of melt adhesion between fibers by adjusting the hot press processing conditions with a calender roll etc. for multi-branched synthetic pulp. There is an excellent feature that the strength of the substrate can be adjusted. Polyolefin resins are excellent in water resistance, chemical resistance, wet dimensional stability, heat weldability, molding processability, and food safety, and are therefore suitable for use as the raw material of the present invention.

  The raw material composition of the multi-branched synthetic pulp preferably contains 50 to 100% by mass of a polyolefin resin by mass ratio, more preferably 70 to 100% by mass, and more preferably 90 to 100% by mass. It is most preferable to contain. If the content of the polyolefin resin in the multi-branched synthetic pulp is within the above range, the adjustment of the melt adhesion between the fibers of the multi-branched synthetic pulp should be satisfactorily adjusted by hot pressing with a calender roll or the like. I can do it. Examples of materials other than polyolefin-based resins include surfactants and hydrophilizing agents such as PVA resins.

  A multi-branched synthetic pulp mainly composed of a polyolefin-based resin is formed of a trunk portion having a large fiber diameter in the whole fiber, such as a trunk of a tree, and ultrafine fibers branched in branches from the trunk portion. In the present invention, the thickness of the fiber of the multi-branched synthetic pulp is not particularly limited, but the average fiber diameter of the fiber trunk is 30 μm or less, preferably 5 μm or less, and the average fiber diameter of the fiber branch is 1.0 μm. Hereinafter, it is preferably 0.5 μm or less. The average fiber length is preferably in the range of 0.1 to 5.0 mm, preferably 0.5 to 3.0 mm. If the average fiber diameter is within the above range, it is possible to produce a synthetic pulp mixed paper having excellent air permeability and concealment, and the oxygen absorbent particles, which are the contents of the oxygen scavenger, are unlikely to leak out. In addition, when the average fiber length is in the above range, the pulp is uniformly dispersed during paper making, and variations in the density and base material strength of the synthetic pulp mixed paper can be suppressed. If the average fiber length is long, the substrate strength of the resulting synthetic pulp mixed paper becomes stronger, but the density variation of the synthetic pulp mixed paper increases. Conversely, if the average fiber length is short, the density variation of the synthetic pulp mixed paper decreases. However, the strength of the synthetic pulp mixed paper tends to be weak. If the density variation of synthetic pulp mixed paper is large, the air permeability and concealment of the oxygen scavenger packaging material and the substrate strength will increase. The variation in sex is also increased.

  As a raw material of the synthetic pulp mixed paper, various known mechanical pulps, chemical pulps, various synthetic pulps, various synthetic fibers and the like may be added in addition to the multi-branched synthetic pulp mainly composed of polyolefin resin.

  The content of the multi-branched synthetic pulp containing a polyolefin resin as a main component in the synthetic pulp mixed paper is 70 to 100% by mass, preferably 90 to 100% by mass. When the content of the multi-branched synthetic pulp is within the above range, the multi-branched synthetic pulp having a polyolefin resin as a main component such as air permeability, concealment, base strength, melt adhesion, and particle supplementation is excellent. It is possible to fully impart the performance to the synthetic pulp mixed paper.

  The melting point (DSC method) of the polyolefin resin used for the multi-branched synthetic pulp is not particularly limited, but is preferably in the range of 100 to 165 ° C, and more preferably in the range of 110 to 140 ° C. preferable. If the melting point of the polyolefin resin is lower than the lower limit of the above range, there is a problem that when the food is heated while the oxygen scavenger is put in the food package, the multi-branched synthetic pulp is melted by the heat of water vapor and adheres to the food. is assumed. If the melting point of the polyolefin resin is higher than the upper limit of the above range, the workability and the melt adhesiveness tend to be inferior.

  The paper making method of the synthetic pulp mixed paper is not particularly limited, but may be made by a known method using a general paper machine using a multi-branched synthetic pulp mainly composed of a polyolefin resin. If the paper is ordinary paper, it is impregnated or coated with a sizing agent or filler, but the oxygen scavenger packaging material in the present invention is supposed to be added to food packaging etc. Since it is not preferred that the filler oozes or falls off the packaging material for oxygen scavengers, it is not recommended to add sizing agents or fillers to synthetic pulp mixed paper. However, even if it is necessary, the minimum addition amount that does not hinder various performances and quality is to be kept.

  Synthetic pulp mixed paper is finished by passing it through a calender roll or the like after the paper making process. At this time, the pressure and temperature of the calender roll are adjusted to adjust the density and air permeability of the synthetic pulp mixed paper that are finally required. In this case, the temperature of the calender roll is preferably set to be lower than the melting point of the polyolefin resin which is the main raw material of the multi-branched synthetic pulp. If the temperature of the calender roll is set higher than the melting point of the polyolefin resin, the polyolefin resin is completely melted and the three-dimensional network structure is lost, and the synthetic pulp mixed paper becomes a film. The performance such as sex will drop sharply.

The density of the synthetic pulp mixed paper is not particularly limited, but it is preferably 0.30 to 0.60 g / cm ³ as a packaging material for the oxygen scavenger before being melt-bonded to the nonwoven fabric, and more preferably 0. It is more preferable that it is 35-0.60 g / cm < ³ >. When the density range of the synthetic pulp mixed paper is within the above range, it is possible to obtain an oxygen scavenger packaging material excellent in air permeability, base material strength and concealment. Synthetic pulp mixed paper controls the breathability, substrate strength, concealment, etc. of the oxygen absorber packaging material, and at the same time, the oil resistant agent penetrates into the oxygen absorber packaging material more than necessary when it is applied. It has a role to stabilize the performance such as oil resistance. Therefore, the synthetic pulp mixed paper needs to have a certain density or more while suppressing the density variation as much as possible.

But not limited basis weight of synthetic pulp mixed paper, in particular, it is preferably from 30 to 60 g / ^{m 2,} more and more preferably 35~60g / ^{m 2.} When the basis weight of the synthetic pulp mixed paper is within the above range, it is possible to obtain a packaging material for oxygen scavengers that is excellent in air permeability, concealability, and processability.

(Nonwoven fabric)
Since the nonwoven fabric used in the oxygen scavenger packaging material of the present invention needs to be fused and integrated with each other after being laminated with synthetic pulp mixed paper, it is preferable to use a thermoplastic resin, In particular, it is preferable to use the same type of polyolefin resin as that used for synthetic pulp mixed paper. As the polyolefin resin, a polyethylene resin, a polypropylene resin, a poly α-olefin resin, and a copolymer or modified product thereof may be appropriately selected according to the required quality. The content of the polyolefin-based resin is 30 to 100% by mass, preferably 50 to 100% by mass, in mass ratio. If content of polyolefin resin is the said range, it will be excellent in melt adhesiveness and the melt adhesiveness between synthetic pulp mixed paper and a nonwoven fabric will fully be satisfied.

  The melting point (DSC method) of the polyolefin resin used for the nonwoven fabric is not particularly limited, but is preferably in the range of 100 to 165 ° C, more preferably in the range of 110 ° C to 140 ° C. The melting point of the polyolefin resin used in the nonwoven fabric may be selected from a resin having a melting point close to the melting point of the polyolefin resin used in the synthetic pulp mixed paper considering the melt adhesion with the synthetic pulp mixed paper. preferable. If the melting point of the polyolefin resin is below the lower limit of the range, there is a risk that the polyolefin resin melts and adheres to food, and conversely the melting point of the polyolefin resin exceeds the upper limit of the range. There is a tendency to be inferior in melt adhesion.

  The polyolefin resin can be added to the nonwoven fabric as a synthetic fiber made of polyolefin resin, or a part of the raw material of polyolefin resin from the viewpoint of stabilization of air permeability and melt adhesion and ease of processing. It is preferable to add it as a core-sheath composite fiber used as.

  Non-woven fabric is laminated with synthetic pulp mixed paper and integrated by melt bonding to provide various properties such as heat resistance, mechanical strength, and extensibility to packaging materials for oxygen absorbers. You may contain resin other than resin. The resin is not particularly limited, but a certain amount of thermoplastic resin such as polyester resin, acrylic resin, or polyamide resin may be added to the nonwoven fabric. Although the content rate in the nonwoven fabric of the said thermoplastic resin is not specifically limited, 10-70 mass% may be contained by mass ratio, and it is more preferable to contain 20-50 mass%. If the content of the thermoplastic resin in the nonwoven fabric is within the above range, an oxygen scavenger packaging material excellent in breathability, melt adhesion, and base material strength, in addition to being provided with various performances by the added resin. It is possible to get.

  Among the thermoplastic resins added to the nonwoven fabric other than the polyolefin resin, it is particularly preferable to use a polyester resin from the viewpoint of processability and mechanical strength. As a method for adding a polyester resin, the method for producing a packaging material for an oxygen scavenger is particularly simple, and it can exhibit excellent performance such as excellent base material strength and delamination strength while maintaining air permeability. Therefore, a method of using a core-sheath composite fiber in which a polyester resin is used for the core part and a polyolefin resin is used for the sheath part as the raw material of the nonwoven fabric is particularly preferable.

  Moreover, the nonwoven fabric in this invention also has the role for ensuring the intensity | strength at the time of water immersion in the packaging material for oxygen absorbers. Synthetic pulp mixed paper used in the present invention is mainly made by dispersing synthetic pulp having a relatively short fiber length in water and making paper by wet paper making, and no sizing agent is added. It becomes brittle and easily breaks when rubbed with a finger. However, since both sides of the synthetic pulp mixed paper are sandwiched between non-woven fabrics and bonded together by melt bonding, the synthetic pulp used in the synthetic pulp mixed paper and the synthetic fibers used in the non-woven fabric are melt-bonded and fixed to each other. The oxygen scavenger packaging material does not decompose at all even if the fibers are loosened after being applied for a long time.

The density of the non-woven fabric used in the present invention is not particularly limited, but is 0.40 g / cm ³ or less before melt-adhesion processing at a density before being melt-bonded with synthetic pulp mixed paper as a packaging material for oxygen absorber. It is more preferable that it is 0.30 g / cm ³ or less. If it is in the said range, when an oil-resistant agent is applied to the prepared oxygen scavenger packaging material, it is difficult for the oil-resistant agent to penetrate into the nonwoven fabric layer.

Is not a basis weight particularly limited nonwoven used in the present invention, it is preferably in the range of 10 to 30 g / ^{m 2,} it is more preferable still is in the range of 15-25 g / ^{m 2.} If the basis weight of the nonwoven fabric is within the above range, it is possible to obtain a packaging material for oxygen scavengers that is excellent in substrate strength and workability. If the lower limit of the range is not reached, the substrate strength of the final oxygen scavenger packaging material tends to be insufficient, and if the upper limit of the range is exceeded, the final oxygen scavenger packaging material becomes too thick. Therefore, it is inferior in workability, such as a melt-bonding process and a cutting process.

  Although the fiber length of the synthetic fiber used for the nonwoven fabric used for this invention is not specifically limited, It is preferable that it is the range of 5.0-100.0 mm, Furthermore, it is the range of 10.0-80.0 mm. More preferred. If the fiber length is within the above range, the processability of the nonwoven fabric is excellent, and the material strength of the oxygen scavenger packaging material can be sufficiently satisfied.

  Although the fineness of the synthetic fiber used for the nonwoven fabric used for this invention is not specifically limited, It is preferable that it is 0.1-20.0 dtex, and it is further more preferable that it is 0.1-10.0 dtex. If the fineness is within the above range, the processability of the nonwoven fabric is excellent, and furthermore, the substrate strength of the oxygen scavenger packaging material can be sufficiently satisfied.

  The manufacturing method of the nonwoven fabric used for this invention is not specifically limited, What is necessary is just to produce by various well-known methods. For example, the fleece preparation method includes a wet method, a dry method, a spun bond method, a melt blow method, an airlaid method, and the fiber bonding methods include a chemical bond method, a thermal bond method, a needle punch method, and a hydroentanglement method. The method for producing the nonwoven fabric may be appropriately selected and used depending on the properties of the fiber raw material and the required quality. Further, the nonwoven fabric before being bonded to the synthetic pulp mixed paper may be not only a nonwoven fabric in a finished state in which fibers are bonded, but also a fleece material before the fibers are bonded. Even if the nonwoven fabric is fleece, there is no strength problem because the thermoplastic resin is melted by the heat of the calender roll and the fibers are bonded at the same time in the bonding process with the synthetic pulp mixed paper. .

  The nonwoven fabric is placed on both sides of the synthetic pulp mixed paper, and then heat and pressure are applied by a device such as a calender roll, so that the interlayer between the nonwoven fabric and the synthetic pulp mixed paper is melt bonded and packaging for oxygen scavenger. It becomes a material. At that time, it is desirable that the raw material composition, basis weight, etc. of the respective nonwoven fabrics arranged on both surfaces of the synthetic pulp mixed paper is the same raw material and the same basis weight unless otherwise specified. If the raw material composition or basis weight is different, it may cause curling of the oxygen scavenger packaging material.

(Packaging material for oxygen absorber)
The oxygen scavenger packaging material is a laminate in which a nonwoven fabric containing a polyolefin resin is arranged on both sides of a synthetic pulp mixed paper using a multi-branched synthetic pulp mainly composed of the polyolefin resin described above. It is characterized in that the layers are melt bonded.

  The method of melt bonding the synthetic pulp mixed paper and nonwoven fabric constituting the oxygen absorber packaging material is not particularly limited, but a method of uniformly melting and bonding the entire surface with a calender roll or a heat on which a specific uneven pattern is engraved. Examples thereof include a method of partially melt-bonding using a roll or the like, a method of melt-bonding using an ultrasonic welder, and the like, and may be appropriately selected and used according to the required quality. In the present invention, without using a sealant material composed of a sheet-like thermoplastic resin generally used for interlayer adhesion of laminates, polyolefin-based resins contained in synthetic pulp mixed paper or non-woven fabric fibers are bonded together. Direct melt bonding makes it possible to obtain strong melt adhesion and substrate strength without reducing air permeability. In addition, the multi-branched synthetic pulp used for synthetic pulp mixed paper has a fine three-dimensional network structure, and heat treatment for making synthetic pulp mixed paper and heat bonding for laminating laminates. By changing the conditions, it is possible to adjust the air permeability, concealability, melt adhesion and substrate strength.

  The thickness of the oxygen scavenger packaging material is not particularly limited, but is preferably in the range of 0.15 to 0.25 mm. When the thickness of the oxygen scavenger packaging material is below the lower limit of the above range, the concealability and the base material strength are poor, and when the upper limit of the above range is exceeded, the air permeability decreases or the thickness increases and thermoforming or cutting. There is a tendency for workability such as processing to decrease.

The basis weight of the packaging material for oxygen scavenger that is preferably in the range particularly but not limited to the 70~110g / ^{m 2,} it is more preferable still is in the range of 80-100 g / ^{m 2.} If the basis weight of the oxygen scavenger packaging material is below the lower limit of the above range, the concealability and substrate strength are poor, and if it exceeds the upper limit of the above range, the air permeability and workability tend to decrease.

The density of packing material for oxygen scavenger that is preferably 0.30~0.60g / cm ^3, it is more preferable still is 0.35~0.55g / cm ^3. If the density of the oxygen scavenger packaging material is within the above range, it has excellent breathability, concealment, and substrate strength, has little oil resistance variation when applied with oil resistance, and has excellent oil resistance fixability. It is possible to obtain packaging materials for oxygen scavengers. When the density of the oxygen scavenger packaging material exceeds the upper limit of the above range, the air permeability tends to decrease, and when the oil-resistant agent is applied, the oil-resistant layer is formed only on the surface layer portion, so that the oil-resistant agent has a fixability. There is a tendency to get worse. Conversely, if the lower limit of the above range is not reached, the concealability and the base material strength tend to decrease, and when the oil resistant agent is applied, the oil resistant agent easily penetrates into the oxygen-absorbing agent packaging material, resulting in an oil resistant layer. As a result of the variation in the formation of, the oil resistance of the oxygen scavenger packaging material tends to vary.

  The air permeability of the oxygen scavenger packaging material is evaluated by using the air resistance according to the Gurley tester method of JIS P8117: 2009 as a representative value, and the value is preferably in the range of 10 to 1000 seconds, more preferably 10 More preferably, it is in the range of ˜500 seconds. If the air resistance of the oxygen scavenger packaging material is within the above range, it is possible to obtain the excellent air permeability required for the present invention. Also, if the air permeability resistance exceeds the upper limit of the range, the air permeability tends to deteriorate, and conversely, if the air resistance falls below the lower limit of the range, the oil resistant agent easily penetrates rapidly, and the oil resistance varies. Tends to occur. The air resistance can be adjusted by the thickness, basis weight, and density of the oxygen scavenger packaging material, as well as the synthetic pulp and fiber diameter of the raw material, and the laminate made of nonwoven fabric and synthetic pulp mixed paper. It is also possible to adjust according to the processing conditions at the time of bonding.

  The opacity of the oxygen scavenger packaging material is evaluated by using opacity in JIS P8149: 2000 as a representative value, and the value is preferably 75% or more, and more preferably 80% or more. When the opacity is below the above range, the reduced iron oxide powder, which is the content of the oxygen scavenger, can be seen through, and when the oxygen scavenger is added to food, etc. The problem of recognizing and causing discomfort occurs. Because the packaging material for oxygen scavengers of the present invention requires that additives such as fillers and sizing agents are basically not used, the opacity of the oxygen scavenger is basically used for the base material. It is adjusted by the properties of the raw fiber and the density and thickness of the synthetic pulp mixed paper.

  The base material strength of the oxygen scavenger packaging material was evaluated using the tear strength in JIS P8116: 2000 as a representative value. The tear strength of the oxygen scavenger is preferably 2000 mN or more, more preferably 2500 mN or more, the weakest tear strength measured in the longitudinal and transverse directions, respectively. When the tear strength is less than the above range, the oxygen absorbent packaging material is easily broken due to insufficient base strength of the oxygen absorbent packaging material, and the risk of leakage of the oxygen absorbent as the contents increases. Regarding the tear strength of packaging materials for oxygen scavengers, the density and thickness of nonwoven fabrics and synthetic pulp mixed papers, the types and fineness and fiber lengths of synthetic pulp and synthetic fibers as raw materials, and laminates composed of nonwoven fabrics and synthetic pulp mixed papers It can be adjusted according to the processing conditions when melt bonding.

  As a standard for evaluating the melt adhesiveness between the layers of the laminate constituting the oxygen scavenger packaging material, J. Org. TAPPI paper pulp test method no. The delamination strength of the laminate measured according to 19-1: 2000 was evaluated as a representative value. The delamination strength of the oxygen scavenger packaging material is preferably 80 N / m or more, and more preferably 100 N / m or more. If the delamination strength is less than the above-mentioned strength, the nonwoven fabric of oxygen scavenger packaging material and synthetic pulp mixed paper easily cause delamination, and the oxygen scavenger packaging material is easily broken or the strength of the base material is reduced. Cause.

  The oxygen scavenger packaging material of the present invention can be improved in oil resistance by applying various oil-proofing agents to the surface layer. When an oxygen scavenger using a packaging material for oxygen scavengers that is not coated with the oil-resistant agent of the present invention is encapsulated in a food package that contains a large amount of oil, the oil contained in the food gradually becomes a packaging material for the oxygen scavenger. As a result, the performance such as air permeability and concealment is greatly deteriorated, and as a result, a part of the oxygen absorbent component inside dissolves in the oil and adheres to the food. For this purpose, it is common to apply an oil-resistant agent or the like to a packaging material for an oxygen scavenger added to foods with a high oil content.

  It does not specifically limit as an oil-proof agent used for this invention, Various well-known oil-proof agents can be used. For example, silicone oil proofing agent, fluorine oil proofing agent, polyolefin oil proofing agent, acrylic oil proofing agent, polyester oil proofing agent, modified polyvinyl alcohol oil proofing agent can be used, but silicon oil proofing agent or fluorine oil proofing agent is used. From the viewpoint of oil resistance, it is most preferable to use a fluorine-based oil resistant agent mainly composed of a perfluoroalkyl compound. Silicon oil and fluorine oils improve the oil resistance by lowering the interfacial tension, making the base surface difficult to apply with oil, whereas other polyolefin oils such as polyolefin oils are used as the base material. Since this is a system in which a firm coating film is formed on the surface to prevent oil from entering, the air permeability is inferior compared to silicon-based oil-proofing agents and fluorine-based oil-proofing agents. In recent years, there has been a demand for improvement in oil resistance. TAPPI paper pulp test method no. It is desirable that the kit value at 41: 2000 is 12 or more. For this purpose, it is preferable to use a fluorine-based oilproofing agent mainly composed of a perfluoroalkyl compound in the oxygen scavenger packaging material of the present invention.

The method of applying the oil resistant agent to the oxygen scavenger packaging material is not particularly limited, and the oil resistant agent may be applied to the surface of the oxygen scavenger packaging material by various known coating methods. The amount of the oil proofing agent applied to the oxygen scavenger packaging material of the present invention is not particularly limited, and may be appropriately adjusted according to the final required quality, but the weight after drying is 0 considering the balance between cost and performance. it is preferably in the range of .3~3.0g / ^{m 2,} it is more preferable still is in the range of 0.5 to 2.0 g / ^{m 2.} When a fluorine-based oil resistant agent mainly composed of a perfluoroalkyl compound is applied to the oxygen scavenger packaging material of the present invention in the above-mentioned application amount range, J. TAPPI paper pulp test method no. It is desirable that the kit value at 41: 2000 be 12 or more.

  The perfluoroalkyl compounds used in the present invention are PFOA (perfluorooctanoic acid) and PFOS (perfluorosulfonic acid) and long-chain PFCAs (carbons of perfluoroalkyl groups) because of concerns about environmental persistence, bioaccumulation and carcinogenicity. It is desirable to use a perfluoroalkyl compound containing 6 or less carbon atoms in the perfluoroalkyl group so that the related substances are not generated even if decomposed.

  The oxygen scavenger packaging material of the present invention has a laminated structure in which synthetic pulp mixed paper is sandwiched between nonwoven fabrics, and the surface layer portion of the oxygen scavenger packaging material is composed of a relatively low density nonwoven fabric sandwiched between the nonwoven fabrics. The inside is made of synthetic pulp mixed paper with higher density than non-woven fabric. The non-woven fabric part of the surface layer has a low density, and since it has a fiber structure mainly composed of cut fibers of synthetic fibers created by a general manufacturing method, the gap between the fibers is relatively wide. When an agent or the like is applied, the oil-resistant agent easily penetrates, and since most of the oil-resistant agent forms an oil-resistant layer only on the surface of the nonwoven fabric, there is almost no decrease in air permeability. On the other hand, the synthetic pulp mixed paper part inside is denser than the non-woven fabric and has a dense fiber structure mainly composed of hyperbranched synthetic pulp, which is an ultrafine fiber. At this time, most of the remaining oil-proofing agent that has passed through the nonwoven fabric layer in the surface layer portion is prevented from permeating near the boundary surface between the synthetic pulp mixed paper and the non-woven fabric, and forms an oil-resistant layer there. However, since synthetic pulp mixed paper uses multi-branched synthetic pulp, there are innumerable extremely fine pores with a three-dimensional network structure on the surface. Therefore, it is possible to suppress a rapid decrease in air permeability due to the application of an oil resistant agent. Thus, by forming two types of oil-resistant layers on both the nonwoven fabric layer, the nonwoven fabric, and the synthetic pulp mixed paper, it has excellent breathability and oil resistance, and has a small variation in oil resistance. It becomes possible to obtain a packaging material, and furthermore, since the oil-resistant layer exists at the boundary between the nonwoven fabric fiber surface and the nonwoven fabric-synthetic pulp mixed paper, the oil-resistant agent does not easily fall off due to bending of the base material. Is excellent.

  As described above, the oxygen-absorbing agent packaging material of the present invention has a laminate structure with different density and fiber structure inside and outside the surface layer portion, and the layers of the laminate are polyolefin resin contained in the fiber raw material of each layer. It is characterized by being bonded by melt bonding, which makes it possible to obtain a packaging material for oxygen scavengers that is excellent in air permeability, concealment and substrate strength. Furthermore, by applying an oil resistant agent to the oxygen scavenger packaging material, it is possible to obtain an oxygen scavenger packaging material with excellent breathability and oil resistance, less oil resistance variation, and excellent oil resistance fixability. Is possible.

Furthermore, the inventor has a density of 0.30 to 0.60 g / cm of the oxygen scavenger packaging material when the oil resistant agent is not applied in order to suppress the variation in oil resistance while having such excellent air permeability. ^It was found that the air permeability resistance according to the Gurley tester method of JIS P8117: 2009 is in the range of 10 to 1000 seconds.

  Next, the present invention will be specifically described with reference to examples of packaging materials for oxygen scavengers.

(About synthetic pulp mixed paper)
Details of the synthetic pulp mixed paper used in Examples and Comparative Examples are shown below.

Synthetic pulp mixed paper 1)
Raw material composition:
・ Multi-branched synthetic pulp (polyethylene resin 100 mass% (melting point 135 ° C.), average fiber length 1.2 mm) ... 100 mass%
Wet papermaking was performed with the above raw material blends to produce the following synthetic pulp mixed paper.
Basis weight of synthetic pulp mixed paper: 40.0 g / m ²
Synthetic pulp mixed paper thickness: 0.10mm
Density of synthetic pulp mixed paper: 0.40 g / cm ³

Synthetic pulp mixed paper 2)
Raw material composition:
・ Multi-branched synthetic pulp (polyethylene resin 100 mass% (melting point 135 ° C.), average fiber length 1.2 mm) ... 100 mass%
Wet papermaking was performed with the above raw material blends to produce the following synthetic pulp mixed paper.
Basis weight of synthetic pulp mixed paper: 30.0 g / m ²
Synthetic pulp mixed paper thickness: 0.10 mm
Density of synthetic pulp mixed paper: 0.30 g / cm ³

Synthetic pulp mixed paper 3)
Raw material composition:
・ Multi-branched synthetic pulp (polyethylene resin 100 mass% (melting point 135 ° C.), average fiber length 1.2 mm) ... 100 mass%
Wet papermaking was performed with the above raw material blends to produce the following synthetic pulp mixed paper.
Basis weight of synthetic pulp mixed paper: 60.0 g / m ²
Synthetic pulp mixed paper thickness: 0.10 mm
Density of synthetic pulp mixed paper: 0.60 g / cm ³

Synthetic pulp mixed paper 4)
Raw material composition:
・ Multi-branched synthetic pulp (modified polyethylene resin 100 mass% (melting point 120 ° C.), average fiber length 1.2 mm) 100 mass%
Wet papermaking was performed with the above raw material blends to produce the following synthetic pulp mixed paper.
Basis weight of synthetic pulp mixed paper: 40.0 g / m ²
Synthetic pulp mixed paper thickness: 0.10 mm
Density of synthetic pulp mixed paper: 0.40 g / cm ³

Synthetic pulp mixed paper 5)
Raw material composition:
・ Multi-branched synthetic pulp (100% by mass of polypropylene resin (melting point 165 ° C.), average fiber length 1.0 mm) ... 100% by mass
Wet papermaking was performed with the above raw material blends to produce the following synthetic pulp mixed paper.
Basis weight of synthetic pulp mixed paper: 40.0 g / m ²
Synthetic pulp mixed paper thickness: 0.10 mm
Density of synthetic pulp mixed paper: 0.40 g / cm ³

Synthetic pulp mixed paper 6)
Raw material composition:
・ Multi-branched synthetic pulp (100% by mass of polyethylene resin (melting point 135 ° C.), average fiber length 1.2 mm) 70% by mass
Synthetic fiber cut fiber (copolymerized polyester resin 100% by mass (softening point 165 ° C.), fineness 2.2 dtex, average fiber length 3.0 mm) ... 30% by mass
Wet papermaking was performed with the above raw material blends to produce the following synthetic pulp mixed paper.
Basis weight of synthetic pulp mixed paper: 40.0 g / m ²
Synthetic pulp mixed paper thickness: 0.10 mm
Density of synthetic pulp mixed paper: 0.40 g / cm ³

Synthetic pulp mixed paper 7)
Raw material composition:
・ Multi-branched synthetic pulp (polyethylene resin 90 mass% (melting point 135 ° C.), PVA resin 10 mass% (melting point 160 ° C.), average fiber length 1.2 mm) 100 mass%
Wet papermaking was performed with the above raw material blends to produce the following synthetic pulp mixed paper.
Basis weight of synthetic pulp mixed paper: 40.0 g / m ²
Synthetic pulp mixed paper thickness: 0.10 mm
Density of synthetic pulp mixed paper: 0.40 g / cm ³

Synthetic pulp mixed paper 8)
Raw material composition:
・ Multi-branched synthetic pulp (70% by mass of polyethylene resin (melting point 135 ° C.), 30% by mass of PVA resin (melting point 160 ° C.), average fiber length 1.2 mm) ... 100% by mass
Wet papermaking was performed with the above raw material blends to produce the following synthetic pulp mixed paper.
Basis weight of synthetic pulp mixed paper: 40.0 g / m ²
Synthetic pulp mixed paper thickness: 0.10 mm
Density of synthetic pulp mixed paper: 0.40 g / cm ³

Synthetic pulp mixed paper 9)
Raw material composition:
Synthetic fiber cut fiber (polypropylene resin 100% by mass (melting point 160 ° C.), fineness 2.2 dtex, average fiber length 3.0 mm) 100% by mass
Wet papermaking was performed with the above raw material blends to produce the following synthetic pulp mixed paper.
Basis weight of synthetic pulp mixed paper: 40.0 g / m ²
Synthetic pulp mixed paper thickness: 0.10 mm
Density of synthetic pulp mixed paper: 0.40 g / cm ³

Synthetic pulp mixed paper 10)
Raw material composition:
Synthetic fiber cut fiber (copolymerized polyester resin 100% by mass (softening point 165 ° C.), fineness 2.2 dtex, average fiber length 3.0 mm) ... 100% by mass
Wet papermaking was performed with the above raw material blends to produce the following synthetic pulp mixed paper.
Basis weight of synthetic pulp mixed paper: 40.0 g / m ²
Synthetic pulp mixed paper thickness: 0.10 mm
Density of synthetic pulp mixed paper: 0.40 g / cm ³

(About non-woven fabric)
The detail of the nonwoven fabric used by an Example and a comparative example is shown below.

Nonwoven fabric 1)
Raw material composition / polyethylene fiber (melting point: 120 ° C., average fiber length: 50 mm): 100% by mass
A fleece was prepared by the above-described raw material blending by a dry method, and fibers were bonded by a thermal bond method to prepare the following nonwoven fabric.
Non-woven fabric weight: 20.0 g / m ²
Nonwoven thickness: 0.07mm
Density of nonwoven fabric: 0.29 g / cm ³

Nonwoven fabric 2)
Raw material composition / polyethylene fiber (melting point: 120 ° C., average fiber length: 50 mm): 50% by mass
・ Polyester fiber (softening point 165 ° C., average fiber length 50 mm): 50% by mass
A fleece was prepared by the above-described raw material blending by a dry method, and fibers were bonded by a thermal bond method to prepare the following nonwoven fabric.
Non-woven fabric weight: 20.0 g / m ²
Nonwoven thickness: 0.07mm
Density of nonwoven fabric: 0.29 g / cm ³

Nonwoven fabric 3)
Raw material composition / polyethylene fiber (melting point 120 ° C., average fiber length 50 mm) 30% by mass
Polyester fiber (softening point 165 ° C., average fiber length 50 mm) 70% by mass
A fleece was prepared by the above-described raw material blending by a dry method, and fibers were bonded by a thermal bond method to prepare the following nonwoven fabric.
Non-woven fabric weight: 20.0 g / m ²
Nonwoven thickness: 0.07mm
Density of nonwoven fabric: 0.29 g / cm ³

Nonwoven fabric 4)
Raw material composition / polyethylene fiber (melting point: 120 ° C., fineness: 2.5 dtex): 100% by mass
A fleece prepared by the spunbond method with the above raw material blend was prepared, and fibers were bonded by the thermal bond method to prepare the following nonwoven fabric.
Non-woven fabric weight: 20.0 g / m ²
Nonwoven thickness: 0.07mm
Density of nonwoven fabric: 0.29 g / cm ³

Nonwoven fabric 5)
Raw material composition / core-sheath composite fiber (sheath part: polyethylene resin (melting point 120 ° C.) 50% by mass, core part: copolymer polyester resin (softening point 165 ° C.) 50% by mass, average fiber length 50 mm) 100% by mass
A fleece was prepared by the above-described raw material blending by a dry method, and fibers were bonded by a thermal bond method to prepare the following nonwoven fabric.
Non-woven fabric weight: 20.0 g / m ²
Nonwoven thickness: 0.07mm
Density of nonwoven fabric: 0.29 g / cm ³

Nonwoven fabric 6)
Raw material composition / polyester fiber (softening point 165 ° C., average fiber length 50 mm): 100% by mass
A fleece was prepared by the above-described raw material blending by a dry method, and fibers were bonded by a thermal bond method to prepare the following nonwoven fabric.
Non-woven fabric weight: 20.0 g / m ²
Nonwoven thickness: 0.07mm
Density of nonwoven fabric: 0.29 g / cm ³

(About packaging materials for oxygen scavengers)
The details of the oxygen scavenger packaging materials used in the examples and comparative examples are shown below.

Example 1)
By passing the laminated body in which the nonwoven fabric 1) is disposed on both surfaces of the synthetic pulp mixed paper 1) through a heat calender roll, the interlayer was melted and bonded to prepare a packaging material for the following oxygen scavenger.
Basis weight: 80.0 g / m ²
Thickness: 0.20mm
Density: 0.40 g / cm ³

Example 2)
By passing the laminated body in which the nonwoven fabric 1) is disposed on both surfaces of the synthetic pulp mixed paper 1) through a heat calender roll, the interlayer was melted and bonded to prepare a packaging material for the following oxygen scavenger.
Basis weight: 80.0 g / m ²
Thickness: 0.22mm
Density: 0.36 g / cm ³

Example 3)
By passing the laminated body in which the nonwoven fabric 1) is disposed on both surfaces of the synthetic pulp mixed paper 2) through a thermal calender roll, the interlayer was melted and bonded to prepare a packaging material for the following oxygen scavenger.
Basis weight: 70.0 g / m ²
Thickness: 0.20mm
Density: 0.35 g / cm ³

Example 4)
By passing the laminated body in which the nonwoven fabric 1) is disposed on both surfaces of the synthetic pulp mixed paper 3) through a heat calender roll, the interlayer was melted and bonded to prepare a packaging material for the following oxygen scavenger.
Basis weight: 100.0 g / m ²
Thickness: 0.17mm
Density: 0.58 g / cm ³

Example 5)
By passing the laminated body in which the nonwoven fabric 1) is disposed on both surfaces of the synthetic pulp mixed paper 4) through a thermal calender roll, the interlayer was melted and bonded to prepare a packaging material for the following oxygen scavenger.
Basis weight: 80.0 g / m ²
Thickness: 0.20mm
Density: 0.40 g / cm ³

Example 6)
By passing the laminated body in which the nonwoven fabric 1) is disposed on both surfaces of the synthetic pulp mixed paper 5) through a heat calender roll, the interlayer is melted and bonded to prepare a packaging material for the following oxygen scavenger.
Basis weight: 80.0 g / m ²
Thickness: 0.20mm
Density: 0.40 g / cm ³

Example 7)
By passing the laminated body in which the nonwoven fabric 1) is disposed on both surfaces of the synthetic pulp mixed paper 6) through a thermal calender roll, the interlayer was melted and bonded, and the following oxygen scavenger packaging material was prepared.
Basis weight: 80.0 g / m ²
Thickness: 0.20mm
Density: 0.40 g / cm ³

Example 8)
By passing the laminated body in which the nonwoven fabric 1) is disposed on both surfaces of the synthetic pulp mixed paper 7) through a thermal calender roll, the interlayer was melted and bonded to prepare a packaging material for the following oxygen scavenger.
Basis weight: 80.0 g / m ²
Thickness: 0.20mm
Density: 0.40 g / cm ³

Example 9)
By passing the laminated body in which the nonwoven fabric 1) is disposed on both surfaces of the synthetic pulp mixed paper 8) through a heat calender roll, the interlayer is melted and bonded to prepare a packaging material for the following oxygen scavenger.
Basis weight: 80.0 g / m ²
Thickness: 0.20mm
Density: 0.40 g / cm ³

Example 10)
By passing the laminated body in which the nonwoven fabric 2) is disposed on both sides of the synthetic pulp mixed paper 1) through a thermal calender roll, the interlayer was melted and bonded, and the following oxygen scavenger packaging material was prepared.
Basis weight: 80.0 g / m ²
Thickness: 0.20mm
Density: 0.40 g / cm ³

Example 11)
By passing the laminated body in which the nonwoven fabric 3) is disposed on both surfaces of the synthetic pulp mixed paper 1) through a thermal calender roll, the interlayer was melted and bonded, and the following oxygen scavenger packaging material was prepared.
Basis weight: 80.0 g / m ²
Thickness: 0.20mm
Density: 0.40 g / cm ³

Example 12)
By passing the laminated body in which the nonwoven fabric 4) is disposed on both surfaces of the synthetic pulp mixed paper 1) through a thermal calender roll, the interlayer is melted and bonded to prepare a packaging material for the following oxygen scavenger.
Basis weight: 80.0 g / m ²
Thickness: 0.20mm
Density: 0.40 g / cm ³

Example 13)
By passing the laminated body in which the nonwoven fabric 5) is disposed on both surfaces of the synthetic pulp mixed paper 1) through a thermal calender roll, the interlayer was melted and bonded to prepare the following oxygen scavenger packaging material.
Basis weight: 80.0 g / m ²
Thickness: 0.20mm
Density: 0.40 g / cm ³

Comparative Example 1)
By passing the laminated body in which the nonwoven fabric 1) is disposed on both surfaces of the synthetic pulp mixed paper 9) through a heat calender roll, the interlayer was melted and bonded to prepare a packaging material for the following oxygen scavenger.
Basis weight: 80.0 g / m ²
Thickness: 0.20mm
Density: 0.40 g / cm ³

Comparative Example 2)
By passing the laminated body in which the nonwoven fabric 1) is arranged on both surfaces of the synthetic pulp mixed paper 10) through a heat calender roll, the interlayer was melted and bonded, and the following oxygen scavenger packaging material was prepared.
Basis weight: 80.0 g / m ²
Thickness: 0.20mm
Density: 0.40 g / cm ³

Comparative Example 3)
By passing the laminated body in which the nonwoven fabric 6) is disposed on both surfaces of the synthetic pulp mixed paper 1) through a thermal calender roll, the interlayer was melted and bonded to prepare a packaging material for the following oxygen scavenger.
Basis weight: 80.0 g / m ²
Thickness: 0.20mm
Density: 0.40 g / cm ³

Comparative Example 4)
A laminated body in which a sheet-like sealant layer (10 g / m ² ) mainly composed of an ethylene-vinyl acetate copolymer resin is provided on both sides of a synthetic pulp mixed paper 1) and a nonwoven fabric 1) is arranged on both sides thereof is a thermal calendar. The sheet was passed through a roll, and the interlayer between the synthetic pulp mixed paper and the nonwoven fabric was adhered by a sealant layer to prepare the following oxygen scavenger packaging material.
Basis weight: 100.0 g / m ²
Thickness: 0.22mm
Density: 0.45 g / cm ³

Comparative Example 5)
As a comparative example, Tyvek (registered trademark) was used as a packaging material for oxygen scavengers. Details of Tyvek are shown below.
Basis weight: 77.0 g / m ²
Thickness: 0.18mm
Density: 0.43 g / cm ³

Comparative Example 6)
As a comparative example, kraft pulp paper (KP paper) was used as a packaging material for oxygen scavengers. Details are shown below.
Basis weight: 78.0 g / m ²
Thickness: 0.10mm
Density: 0.78 g / cm ³

  The following evaluation tests were conducted using the oxygen scavenger packaging materials prepared under the conditions of Examples 1 to 13 and Comparative Examples 1 to 6. Note that the standard conditions of the evaluation test and the pretreatment of the evaluation sample shall conform to JIS P8111: 1998 unless there are individual designated conditions for each evaluation test.

<Air permeability resistance (before application of oil resistant agent)>
The air resistance of the packaging materials for oxygen scavengers of Examples and Comparative Examples was measured according to the Gurley tester method of JIS P8117: 2009, classified according to the following criteria, and air permeability was evaluated.
AA: 10 seconds or more and 500 seconds or less A: 501 seconds or more and 1000 seconds or less B: 1001 seconds or more and less than 1300 seconds C: 1301 seconds or more or less than 10 seconds

<Air permeability resistance (after applying oil resistance agent)>
A sample for evaluation was prepared by applying 1 g / m ^{2 by} weight of a fluorine-based oil-resistant agent containing a perfluoroalkyl compound as a main component to the surface of the oxygen scavenger packaging materials of Examples and Comparative Examples, and then preparing a sample for evaluation. According to the 2009 Gurley tester method, the air permeation resistance of the evaluation sample was measured and classified according to the following criteria, and the air permeability after application of the oil resistant agent was evaluated.
AA: 10 seconds or more and 500 seconds or less A: 501 seconds or more and 1000 seconds or less B: 1001 seconds or more and less than 1300 seconds C: 1301 seconds or more or less than 10 seconds

<Opacity>
The opacity of the oxygen scavenger packaging material prepared according to JIS P8149: 2000 was measured and classified according to the following criteria, and the concealability was evaluated.
AA: 80% or more A: 75% or more and less than 80% B: 70% or more and less than 75% C: less than 70%

<Tear strength>
The tear strength of the oxygen scavenger packaging material prepared according to JIS P8116: 2000 was measured and classified according to the following criteria, and the substrate strength was evaluated.
AA: 2500 mN or more A: 2000 mN or more and less than 2500 mN B: 1000 mN or more and less than 2000 mN C: Less than 1000 mN

<Melting adhesiveness>
J. et al. TAPPI paper pulp test method no. In accordance with 19-1: 2000, the delamination strength of the oxygen scavenger packaging material prepared under the above conditions was measured, classified according to the following criteria, and evaluated for melt adhesion.
AA: 100 N / m or more A: 80 N / m or more and less than 100 N / m B: 60 N / m or more and less than 80 N / m C: Less than 60 N / m

<Oil resistance (normal site evaluation)>
A sample for evaluation was prepared by applying 1 g / m ^{2 by} weight of a fluorine-based oil resistant agent mainly composed of a perfluoroalkyl compound to the surface of the packaging material for oxygen scavengers of Examples and Comparative Examples after drying. TAPPI paper pulp test method no. According to 41: 2000, the kit value on the oil-resistant agent-coated surface side of the evaluation sample was measured and classified according to the following criteria to evaluate oil resistance.
AA: Kit value of 12 or more A: Kit value of 10 or more and less than 11 B: Kit value of 9 or more and less than 10 C: Kit value of less than 9

<Oil resistance (folded part evaluation)>
A sample for evaluation was prepared by applying 1 g / m ^{2 by} weight of a fluorine-based oil-proofing agent containing a perfluoroalkyl compound as a main component to the surface of the oxygen scavenger packaging material of the examples and comparative examples. The sample was repeatedly bent 90 degrees 20 times. TAPPI paper pulp test method no. According to 41: 2000, the kit value on the oil-resistant agent-coated surface side of the bent portion of the evaluation sample was measured and classified according to the following criteria to evaluate the oil-resistant agent fixability.
AA: Kit value of 12 or more A: Kit value of 10 or more and less than 11 B: Kit value of 9 or more and less than 10 C: Kit value of less than 9

  Table 1 shows the results of evaluating the oxygen scavenger packaging materials prepared in Examples 1 to 13 and Comparative Examples 1 to 6 based on the evaluation method described above.

  From the results shown in Table 1, the oxygen-absorbing agent packaging materials of Examples 1 to 13 are excellent in air permeability, concealment and base material strength, and have less deterioration in air permeability and variation in oil resistance when an oil resistant agent is applied. It can be seen that the oil-resistant agent has excellent fixability and that excellent oil resistance can be obtained by applying a fluorine-based oil-resistant agent.

  As in Example 13, when a core-sheath composite fiber in which the sheath part is composed of a polyolefin-based resin and the core part is formed of a polyester-based resin as a raw material for the nonwoven fabric, air permeability or The substrate strength can be maximized while maintaining performance such as concealment.

  As in Comparative Example 1, when a polypropylene fiber cut fiber is used as a main raw material without using a multi-branched synthetic pulp mainly composed of a polyolefin resin as a raw material of a synthetic pulp mixed paper, a packaging material for an oxygen scavenger is used. The concealability is reduced, and the gap between fibers is larger than that of multi-branched synthetic pulp. Variation in sex occurred.

  As in Comparative Example 2, when a cut fiber of a copolymerized polyester fiber is used as a main raw material without using a multi-branched synthetic pulp mainly composed of a polyolefin-based resin as a raw material for synthetic pulp mixed paper, Comparative Example 1 and Similarly, the concealability is reduced, and not only oil resistance and oil resistance variations occur, but also the synthetic pulp mixed paper and polyolefin-based resin component because the resin component of the synthetic pulp mixed paper is based on the copolyester resin. The melt adhesion with the nonwoven fabric mainly composed of resin was lowered, and as a result, the base material strength of the oxygen-absorbing agent packaging material was lowered.

  As in Comparative Example 3, when no polyolefin-based resin is contained as a raw material for the nonwoven fabric, the melt adhesiveness with the synthetic pulp mixed paper is lowered, and as a result, the base material strength of the oxygen scavenger packaging material is lowered. did.

  As in Comparative Example 4, a laminate in which a sealant material composed of an ethylene-vinyl acetate copolymer resin is disposed between a synthetic pulp mixed paper and a nonwoven fabric and the synthetic pulp mixed paper and the nonwoven fabric are bonded via the sealant material is deoxygenated. When used as a packaging material for preparations, the sealant material blocked the passage of air, so the ventilation performance was not good in the first place. When an oil-resistant agent was applied, the ventilation performance was further reduced.

  As in Comparative Example 5, when Tyvek (registered trademark), which is a nonwoven fabric made of multi-branched long fibers of high-density polyethylene resin similar to a multi-branched synthetic pulp, is used as a packaging material for an oxygen scavenger, Although it is excellent in base material strength, it is a non-woven fabric made by laminating continuously spun multi-branched fibers as they are, so the density variation of the base material is large compared to the synthetic pulp mixed paper used in the present invention. As a result, the variation in concealability and oil resistance became large and was not stable.

  As in Comparative Example 6, when kraft pulp paper is used as a packaging material for oxygen scavengers, the strength of the base material is originally weak because only the paper base material is used, and the oil-resistant layer is only on the base material surface. Because the fixability between the oil-resistant agent and the base material is weak because it is formed, the base material in the bent part is damaged when the base material is folded, or the oil-proof agent falls off and peels off the base material, It can be seen that the oil resistance of the bent part is greatly reduced.

  The packaging material for oxygen scavengers of the present invention can be used for exterior packaging materials for freshness-preserving agents such as oxygen scavengers, desiccants, alcohol transpiration agents, and individual packaging materials such as medical instruments.

DESCRIPTION OF SYMBOLS 1; Oxygen absorber packaging material 2; Synthetic pulp mixed paper 3; Non-woven fabric 4; Non-woven fabric 5; Oil-resistant agent layer 6; Sealant layer 7;

Claims (6)

  This is a laminate in which non-woven fabric containing polyolefin resin is arranged on both sides of synthetic pulp mixed paper using multi-branched synthetic pulp mainly composed of polyolefin resin, and is created by melt bonding the layers of the laminate. Oxygen absorber packaging material.   The oxygen-absorbing agent packaging material according to claim 1, wherein the content of the multi-branched synthetic pulp in the synthetic pulp mixed paper is in the range of 70 to 100% by mass.   The oxygen-absorbing agent packaging material according to claim 1 or 2, wherein the content of the polyolefin-based resin in the nonwoven fabric is in the range of 30 to 100% by mass.   The oxygen-absorbing agent packaging material according to claim 1, wherein the nonwoven fabric is made of core-sheath composite fiber as a main raw material, the sheath part is a polyolefin resin, and the core part is a polyester resin. The density according to claim 1, wherein the density is in the range of 0.30 to 0.60 g / cm ³ , and the air resistance according to the Gurley tester method of JIS P8117: 2009 is in the range of 10 to 1000 seconds. Packaging material for oxygen agent.   One of the surfaces is coated with a fluorine-based oilproofing agent containing a perfluoroalkyl compound as a main component. TAPPI paper pulp test method no. The packaging material for oxygen scavengers according to claim 1, wherein the kit value at 41: 2000 is 12 or more.

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