JPH0420660B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an oxygen absorber package used for maintaining the quality of foods, etc. Paper 1 and a sheet 2 made of polyethylene or a non-woven plastic fabric with a softening point lower than polyethylene are stacked together without pasting, the sheet 2 is folded inward and the peripheral edges on three sides are sealed, and an oxygen scavenger is contained inside. The present invention relates to an oxygen absorber package, characterized in that the package contains: [Prior art and its problems] Recently, oxygen absorbers have been increasingly used for preserving food and other products, and especially when the application is in the food field, oxygen absorbers Unlike conventional desiccant packages, where there is no problem even if there is variation as long as the air permeability is maintained above a certain level, it is an extremely important requirement that the air permeability be adjusted with high precision. I'm getting old. In other words, if the target food has a high moisture content and is susceptible to quality deterioration due to oxygen, it is necessary to keep the oxygen absorption rate within a certain range by adjusting the air permeability of the oxygen absorber package to a large degree and with high precision. Yes, if foods with large variations in air permeability and low oxygen absorption rates are mixed, the quality of the food will deteriorate before oxygen is absorbed, making it impossible to achieve the original purpose of maintaining quality. In addition, when the target is dry food, quality deterioration is slow and there is no need for a high oxygen absorption rate, but if the oxygen absorber contains moisture in advance to absorb oxygen, if the air permeability is too high, the oxygen absorber packaging Water from the body may transfer to dried food, resulting in quality deterioration. In particular, the moisture content locally increases at the contact area between the oxygen absorber package and the dry food, often resulting in quality deterioration. On the other hand, if the air permeability of the oxygen absorber package is too high due to the oxygen absorption capacity of the oxygen absorber,
Moisture necessary for oxygen absorption evaporates, and the oxygen absorption capacity decreases, causing oxygen to remain in the food packaging, which may lead to deterioration of the quality of dried foods due to oxidation, etc. In other words, when targeting dry foods, the air permeability of the oxygen absorber package can be adjusted to a small and precise level, thereby optimizing the moisture transfer rate.
It is necessary to enable the oxygen scavenger to fully demonstrate its oxygen absorption ability under dry conditions. As mentioned above, the air permeability of the oxygen absorber package is important in determining its oxygen absorption rate, exchange of moisture with food, and oxygen absorption capacity, and varies from low to high air permeability depending on the characteristics of the target food. It has been desired to precisely adjust the airflow rate. In addition to the above-mentioned air permeability, water resistance, breakage resistance, safety and hygiene, food flavor retention, appearance retention, and the like have become important requirements in response to the characteristics of a wide variety of foods. In particular, unlike conventional desiccant packages, etc.
In the case of oxygen scavengers, the contents tend to pass through the package and cause rust and stains, which impairs the appearance and is not desirable from a health and safety standpoint, so appearance retention was an important requirement. Conventionally, the packaging material for oxygen absorbers has generally been a thermal laminate of paper and perforated polyethylene film, and the breathability in this case is controlled by the porosity (pore diameter, number of holes) of the polyethylene film. It had been. However, in adjusting air permeability, there were drawbacks such as deformation of air holes during thermal bonding during manufacturing of packaging materials, making air permeability unstable and causing variations in oxygen absorption rate. In particular, there was a problem of large variations in air permeability at low air permeability, and variations in oxygen absorption capacity and moisture transfer rate under dry conditions. Furthermore, increasing the porosity of the polyethylene film in order to adjust it to high air permeability has the disadvantage of increasing the occurrence of rust and stains. Furthermore, when this oxygen absorber is applied to foods with a high moisture content, the packaging material has poor water resistance, so the packaging bag for the oxygen absorber may become damp and break, or the contents may pass through the holes in the perforated polyethylene film. There were drawbacks such as the fact that water may seep out, which is unfavorable in terms of food safety and hygiene. As a packaging material that improves the above drawbacks, JP-A-53
Japanese Patent Application No. 51096 discloses a packaging material in which two plastic films having different melting points are made with holes and are either stacked on top of each other or laminated and bonded with paper sandwiched between them. In this case, since the film is thermally bonded after opening, the holes may be deformed or closed during bonding, making it difficult to stably obtain a packaging material with uniform air permeability within the desired range. The drawback was that it was difficult. Further, there is a drawback that the air permeability changes depending on the pressure bonding state of each film or paper during adhesion. Further, Japanese Patent Application Laid-Open No. 56-124441 discloses a packaging material using a plastic film having holes in its surface. However, even in these cases, there were drawbacks such as the holes being deformed due to the use of an adhesive, and the air permeability changing depending on the influence of the adhesive and the pressure bonding condition during lamination. In addition, in packaging materials using plastic film with holes on the surface, there is a paper layer between the perforated parts on the front and back, and the positions of the perforated parts on the front and back are shifted, so oxygen is absorbed into the packaging material. When passing through the paper layer, it passes through the cross section of the paper layer in the horizontal direction and vents through the holes on the front and back.
It was not possible to increase the air permeability beyond a certain level. If the porosity of the front and back pores were increased in order to increase the size, there was a drawback that rust and stains would occur. Furthermore, in the case of conventional packaging materials, it was not possible to increase air permeability while preventing rust and staining (while ensuring safety and hygiene). The packaging material area per unit of oxygen absorption is large (= high air permeability), and the oxygen absorption rate is high.On the other hand, the large size has a small packaging material area per unit oxygen absorption amount (= low permeability), which increases oxygen absorption. The speed has decreased. In other words, even if the content of the oxygen absorber doubles, the size of the oxygen absorber package (packaging material area) cannot be increased proportionally, and the packaging material area per unit amount of oxygen absorbed is smaller in the large size than in the small size. The drawback was that the oxygen absorption rate had to change depending on the size. Particularly, in large sizes, the air permeability cannot be adjusted above a certain level and the oxygen absorption rate cannot be increased. In addition, in the case of conventional packaging materials, since the air permeability varies widely, packaging material air permeability inspections are inevitably required frequently, and the defect rate is also high. In addition, when applying oxygen absorbers and freshness-preserving agents using conventional packaging materials to foods such as cheesecake, yam kelp, peanuts, etc., where it is important to preserve the aroma, problems such as the aroma deteriorating or becoming weaker occur. It had been pointed out. [Problems to be Solved by the Invention] The purpose of the present invention is to solve the above-mentioned problems of conventional packaging materials, and to create a stable packaging material that can be precisely adjusted from low air permeability to high air permeability. An object of the present invention is to provide an oxygen absorber package which has air permeability, causes no safety and hygiene problems even when applied to humid foods, has high strength, and has excellent food flavor retention properties. A further object of the present invention is to provide an oxygen absorber package that makes it possible to make the oxygen absorption rate the same for each oxygen absorption size. [Means for Solving the Problems] The present inventors conducted intensive research in view of the problems of the prior art described above, and as a result, completed the present invention. That is, in the present invention, a plastic film with holes or a transparent paper with holes 1 and a sheet 2 made of polyethylene or a nonwoven fabric of plastic whose softening point is lower than that of polyethylene are overlapped without pasting, and the sheet 2 is To provide an oxygen absorber package, which is folded inward and sealed on three peripheral edges, and stores an oxygen absorber inside. The oxygen absorber package of the present invention is made of a perforated plastic film or a perforated transparent paper.
(hereinafter sometimes referred to as the outer material), a sheet 2 made of polyethylene or a plastic nonwoven fabric having a softening point lower than polyethylene (hereinafter sometimes referred to as the inner material), and an oxygen absorber. Then, the outer material 1 and the sheet 2 are arranged facing each other, and the sheet 2 is folded inward, and the peripheral edges on three sides are sealed so that the oxygen absorber is stored inside the space formed by the sheet 2. There is. In the present invention, the plastic film with holes constituting the outer material 1 includes, for example, films made of polyethylene terephthalate, polyamide, polypropylene, polycarbonate, cellophane or polyvinyl alcohol, various films coated with polyvinylidene chloride, and even aluminum. Single-layer films such as various vapor-deposited films or
Examples include composite films in which these films are laminated with plastic films made of polyethylene, ethylene vinyl acetate copolymer, ionomer resin, polybutadiene, polyvinyl chloride, etc.
A hole with an appropriate size and number of holes is used. In the present invention, when a composite film is used, the plastic film layer made of polyethylene, ethylene vinyl acetate copolymer, ionomer resin, polybutadiene, polyvinyl chloride, etc. is arranged so as to face the inner material. As the transparent paper, for example, transparent paper such as glassine paper or birch paper is used. Note that the transparent paper 1 in the present invention also includes papers in which these papers are laminated with a plastic film made of polyethylene, ethylene vinyl acetate copolymer, ionomer resin, polybutadiene, polyvinyl chloride, or the like. Among these, polyethylene terephthalate film or polyamide film is preferred in consideration of strength, ease of manufacturing, etc. The thickness of the film constituting the outer material is preferably 100μ or less for ease of handling during manufacturing, and 10~
60μ is particularly preferred. The air permeability of the outer film is preferably 1000ml/ ^m224hr atm or less in oxygen permeability.
Particularly preferred is 500ml/m ² 24hr atm or less. Furthermore, the number and size of holes when making holes in the outer material can be appropriately selected depending on the desired air permeability. In the present invention, when making holes in plastic film or paper, for example, conical, square pyramidal,
Needles in the shape of a triangular pyramid, a cylinder with a pointed tip, etc. are used. In addition, the size of the hole can be adjusted by adjusting the thickness and length of the needle, the pressure when making the hole, etc.
It is also possible to make uniformly shaped holes by heating the needle. However, if holes are opened while the film is melted with a heated needle, the diameter of the holes will increase and rust, stains, etc. will become noticeable, so it is preferable to open the holes without heating the needle. In addition, as for the direction in which the holes are to be opened, it is preferable that the holes be opened from the outside when the package is created so as not to protrude toward the surface of the package. In the present invention, as the nonwoven fabric used in the inner material sheet 2, any nonwoven fabric can be used, such as wet type, dry type, or spunbond type nonwoven fabric, and polyethylene, polyethylene vinyl acetate copolymer, polypropylene, This includes those manufactured using fibers with a core of polyester or the like and a sheath of polyethylene or polyethylene-vinyl acetate copolymer. In the present invention, water resistance is improved by using a breathable nonwoven fabric that does not allow water to pass through under normal pressure.
By setting the porosity of the outer material to 3% or more, it becomes possible to use it as a moisture-dependent type. As the nonwoven fabric of the present invention, 10g/m ² to 100g/
m ² m ² is preferable, and the thickness is 20 to 250μ
can be used, preferably 30-180μ
These are used taking into consideration packaging suitability, packaging material strength, etc. Furthermore, in order to impart water repellency or oil repellency to the paper or nonwoven fabric, it is possible to use paper or nonwoven fabric treated with a water repellent or oil repellent. Furthermore, in order to increase the adhesive strength between the outer material and the inner material sheet, it is also possible to appropriately choose to apply an anchor coating agent or a heat sealing agent to the nonwoven fabric of the inner material. Furthermore, in the packaging material of the present invention, printing can be applied to the back side of the outer film having holes.
Furthermore, it is possible to perform printing such as character printing on the back side of the non-breathable outer material and then perform solid printing. To manufacture the oxygen absorber package according to the present invention,
Generally, a three-way sealing method is used. Specifically, a vertical or horizontal three-sided seal automatic filling and packaging machine is used. In the three-way sealing method, the outer material sheet 1 and the inner material sheet 2 are guided into an overlapping three-way seal type automatic filling and packaging machine, folded in half with 2 on the inside, and heat-sealed only at the periphery of the bag while removing an appropriate amount. Manufactured by filling with oxygen agent. At this time, holes of a desired number and size are punched in the outer material 1 by a punching device installed in a three-sided seal type automatic filling and packaging machine, and the air permeability of the oxygen absorbing seat package is adjusted with high precision. When manufacturing the oxygen absorber package according to the present invention, by making the dimensions of the outer material 1 larger than the dimensions of the inner material sheet 2 by 1 mm or more, preferably by 2 mm or more,
The inner material sheet 2 does not protrude from the outer material 1 during filling and packaging, which is preferable in terms of appearance. Furthermore, by increasing the dimensions of the outer material 1,
It becomes possible to partially heat-seal the outer materials together, making it possible to increase the strength of the package. In the present invention, in order to adjust the air permeability of the oxygen absorber package over a wide range from low air permeability suitable for dry foods to high air permeability suitable for high moisture foods, it is necessary to compare the air permeability of the outer material 1 with high accuracy. The air permeability of the inner sheet 2 must be 1.2 times or more, preferably 1.5 times or more. If the air permeability of the inner material sheet 2 is less than 1.2 times that of the outer material 1, the variation in the air permeability of the inner material sheet 2 will affect the air permeability of the outer material 1, which should be rate-determining with high accuracy, and The variation in air permeability of the acid material packaging becomes large. In general, the air permeability of the inner sheet 2 is 20g/ ^m2・24Hr・atm (25
℃) or more is required, preferably 50g/ ^m2・
24Hr・atm (below 25℃) or more, 100g/ ^m2・24Hr・
ATM (below 25°C) or higher is more preferable. In addition, in order to maintain the same oxygen absorption rate and performance for each oxygen absorption capacity size, although it is affected by the filling amount and characteristics of the oxygen scavenger in the contents, if the oxygen absorption capacity size is doubled, the This becomes possible by approximately doubling the number of holes. In the present invention, the oxygen scavenger includes sulfite,
Bisulfite, dithionite, hydroquinone,
Catechol, resorcinol, pyrogallol, gallic acid, longalites, ascorbic acid and/or its salts, isoascorbic acid and/or its salts, sorbose, glucose, lignin, dibutylated hydroxytoluene, butylated hydroxyanisole, ferrous salts, or iron Oxygen absorbers containing metal powder such as powder, carbon dioxide gas generating type oxygen absorbers, carbon dioxide gas absorbing type oxygen absorbers, etc. are used. In the present invention, specifically, for example, PET/PE
Film 1 with small holes made and non-woven fabric 2 are overlapped and folded without pasting, and an oxygen absorber is added and sealed on three sides, or glassine paper with small holes 1 and non-woven fabric 2 are pasted. One that is folded with the overlap 2 on the inside without being attached, and sealed on three sides with an oxygen absorber added, or one that has small holes made in parchment paper/EVA 1 and one side of the nonwoven fabric coated with ionomer latex. An example of this is an oxygen absorber package in which 2 are overlapped without pasting, 2 is folded inward, an oxygen absorber is added, and three sides are sealed. [Operations and Effects] The oxygen absorber package of the present invention has an outer material 1 and an inner material sheet 2 made of nonwoven fabric, which are arranged with 2 facing inside,
Since the peripheries on three sides of the fold are sealed, ventilation flows from the openings in the outer material 1, through the spaces between the outer material 1 and the inner sheet 2, and through the inner sheet 2 to the oxygen scavenger in the contents. In this case, by making the air permeability of the inner material sheet 2 at least 1.2 times greater than that of the outer material 1,
While preventing the influence of variations in the air permeability of the inner material sheet 2, the desired air permeability of the deoxidizing material package is determined by controlling the air permeability of the outer material 1, which has holes that are precisely adjusted without going through processes such as thermal bonding and pressure bonding. It becomes possible to adjust the level with high precision. In addition, since there is a space between the outer material 1 and the inner material sheet 2, it is possible to take advantage of the highly accurate air permeability of the outer material 1, which was previously difficult to achieve. It is now possible to precisely adjust the air permeability at ^2.24Hr.at level). Furthermore, in the deoxidizing material package of the present invention, since printing is performed on the back side of the film of the outer material 1, the ink does not come into direct contact with the food, so it is sanitary and safe. In addition, if solid printing is applied on top of character printing, even if the contents ooze out onto the inner sheet 2, there will be solid printing, that is, concealment printing, which will damage the appearance of the package. There isn't. Furthermore, since there is a space between the outer material 1 and the inner material sheet 2, the concealing effect is even greater, and rust and stains are less likely to transfer to the target food, making it sanitary and safe. In addition, the above-mentioned rust and stain hiding effect is large, and the thickness of the needle of the punching device when manufacturing the oxygen absorber package,
By changing the number of oxygen absorbers, it is possible to freely and precisely give the desired air permeability, making it possible to increase the air permeability of the oxygen absorber package, which was previously difficult. It became possible to provide high air permeability to large sizes, and it was possible to make the oxygen absorption rate and capacity the same for each oxygen absorption size without variation. Furthermore, in the case of the oxygen absorber package of the present invention, especially when a plastic film is used on the surface,
Due to the water resistance of plastic film and double bag structure, it has excellent water resistance even when applied to high moisture foods, and has excellent breakage resistance when wet. In addition, the packaging materials used in the oxygen scavenger packaging of the present invention have simpler processing steps than conventional packaging materials whose surface is made of plastic film, and the desired air permeability can be imparted during packaging. Therefore, there are fewer errors in processing the packaging material and it can be manufactured stably. Further, conventional packaging materials are manufactured in wide widths and processed to have a desired air permeability during packaging material processing. At this time, changes in air permeability were observed due to pressure, external force, etc. during winding, storage, and handling of the packaging material, and there were large variations in air permeability due to the structure of the packaging material, so the desired air permeability could not be imparted. This required thorough inspection to ensure that the product was in good condition, and the defective rate was high. On the other hand, according to the present application, by setting the air permeability of the inner sheet 2 as high as long as it does not impede the sealing performance, it is only necessary to confirm that the air permeability is above a certain level, which greatly simplifies the air permeability inspection. This makes it possible to eliminate defects. Furthermore, since the air permeability is imparted to the outer material 1 by opening the holes for the first time during filling and packaging to provide the desired air permeability with high precision, it has become possible to eliminate the need for air permeability testing. In addition, since the desired air permeability can be freely given to each oxygen absorber package at the time of filling and packaging, there is no need to prepare and stock packaging materials with various air permeability, and packaging materials can be stocked for each type of oxygen absorber. can be significantly reduced. Furthermore, according to the oxygen absorber package of the present application, it is possible to adjust the air permeability to a low level and with high precision.
It has the advantage of being able to make it difficult for the food scent to reach the inside of the oxygen absorber, and has excellent scent retention. In particular, when the surface is made of a plastic film that does not allow fragrance to pass through, the scent retention effect is great. In addition, in the case of conventional oxygen absorber packages, when applied to vacuum packed foods, etc., the pressure inside the packaging system decreases rapidly during vacuum packing, so the air inside the oxygen absorber package has the same pressure as the outside air. As a result, the oxygen absorber package expands rapidly. At that time, a large pressure was applied to the seal portion of the oxygen absorber package, and the oxygen absorber package was sometimes damaged. In particular, laminated packaging materials with paper whose surface is made of plastic film have been problematic because they have poor air permeability when pressure is applied. In addition, in paper/perforated PE packaging materials, if the air permeability is increased, the generation of rust and stains becomes a problem, so it has not been possible to provide air permeability under sufficient pressure. According to the present application, due to the concealment printing on the back surface of the outer material and the concealing effect due to the space between the outer material and the inner material sheet, the air permeability of the inner material sheet is increased, and the ventilation of the outer material is controlled between the outer material 1 and the inner material sheet 2. Since there is a space in between, air passes directly through the openings, so air permeability under pressure is high, and even when vacuum packing, the pressure difference between the oxygen absorber package and the outside air is quickly adjusted.
It is possible to use a highly safe oxygen scavenger as pressure is not easily applied to the sealed part. In addition, conventional oxygen absorbers that have a high oxygen absorption rate inevitably generate heat, so when applied to frozen foods, refrigerated foods, etc., the heat generated causes some of the food that comes into contact with the oxygen absorber to heat up. There were cases where the quality deteriorated. In the present application, since there is a space between the outer material 1 and the inner material sheet 2, the heat of the oxygen absorber during heat generation is difficult to be transmitted to the food, and it is also excellent in preventing the effects of heat generation. [Example] Next, the present invention will be explained in more detail with reference to Examples. Example 1 The following materials were prepared. (1) Laminated film made by laminating polyethylene terephthalate film 12μ and polyethylene film 25μ (2) Polyethylene nonwoven fabric 50g/m ² (3) Iron-based oxygen absorber Each of (1) and (2) is rolled into a roll with a width of 100mm. Prepare the film and sheet, and cut (1) to a diameter of 0.5mm.
Pass it through a needle roll with a needle attached to it and make a hole (2)
Introduced into a three-sided seal automatic filling and packaging machine while stacking the two on the inside, filling 3g of (3) into the inside of (2) and sealing from the outside of (1) with a bar heater.
The connected sealed portion was cut to obtain a pouch with dimensions of 50 x 50 mm. By adjusting the number of holes drilled in (1), we obtained small bags with various numbers of holes, and measured the deoxidation time at 25°C under the presence of 500 ml of air in each bag.
The results shown in Table 1 were obtained. 【table】

[Brief explanation of drawings]

In the drawings, FIGS. 1 and 2 show examples of automatic filling and packaging machines, with FIG. 1 showing an example in which a heat roll is used, and FIG. 2 showing an example in which a bar heater is used. Further, FIG. 3 shows a conceptual diagram of one embodiment of the packaging material configuration of the oxygen absorber package of the present invention, and FIG. 4 shows a cross-sectional perspective view of one embodiment of the oxygen absorber package of the present invention. In the drawing, 1 is an unperforated outer material, 2 is an inner material,
3 is a needle roll, 4-1 is a heat roll, 4-2 is a bar heater, 5 is an oxygen absorber filling chute, 6 is a cutter, 7 is a packaging material sealing part, 8 is an oxygen absorber package,
11 is polyester film or transparent paper with holes, 12 is polyethylene or a plastic film with a softening point lower than polyethylene, 13
18 represents a nonwoven fabric, and 18 represents an oxygen scavenger.

Claims (1)

[Claims] 1 A plastic film with holes or a transparent paper with holes 1 and a sheet 2 made of polyethylene or a non-woven plastic fabric with a softening point lower than polyethylene are overlapped without pasting, and folded on three sides with the sheet 2 inside. An oxygen absorber package characterized in that the peripheral edge of the package is sealed and an oxygen absorber is housed inside.