JP2780230B2 - Partition membrane for storing freshness agent - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a freshness-retaining agent-storing partition film used in a closed container for storing a freshness-retaining agent for the purpose of preserving articles such as foods. [Prior art] Conventionally, foods affected by moisture, oxygen, microorganisms, etc.
In order to prevent deterioration of the quality of medicines, preservation items such as foods and medicines and freshness preserving agents such as desiccants, preservatives, insect repellents, and oxygen scavengers are enclosed together in sealed containers. Have been. At that time, if the freshness preserving agent comes into direct contact with food, etc., the freshness preserving agent often becomes contaminated with oil or moisture of the food, etc., and its function is often impaired. There was also a risk of accidental eating. For this reason, it has been practiced to isolate the freshness-keeping agent contained in the container from the food. That is, a separator is provided on a part of the container to maintain the freshness of the food contained in the container, and the food and the freshness-retaining agent are separated by disposing the food and the freshness-retaining agent on both sides of the separator. Attempts have been made to do so. For example, Japanese Utility Model Laid-Open Publication No. 50-130554 discloses an oxygen-absorbing member formed by sealing and holding a chemical agent that absorbs oxygen by a gas-permeable material made of a plastic film such as a low-density polyethylene film and generates carbon gas. A container for preventing deterioration of a container attached to a part of a container component facing the internal space of the closed container is disclosed. However, in order to separate the chemical agent from the contents with a plastic film such as a polyethylene film as in the case of this container, it cannot be fixed without a certain thickness. It has a drawback that it has high resistance and is not particularly suitable for maintaining the freshness of foods that change quickly. In addition, when a through hole is formed in a polyethylene film or the like to impart air permeability, the stored article enters the freshness retaining agent storage through the hole, impairs the appearance, is not preferable in terms of hygiene, and also maintains freshness. The function of the agent was sometimes impaired. [Problems to be Solved by the Invention] In view of the above-described problems of the conventional partition wall material, the present invention is mounted on a closed container in order to isolate stored articles and a freshness preserving agent. In the partition membrane, the shape of the partition membrane, strength, rigidity and good air permeability,
Another object of the present invention is to provide an airtight container that does not deteriorate the function of the freshness maintaining agent. [Means for Solving the Problem] The present inventors have found that when a plurality of projections having a small film thickness are provided on a plastic sheet such as polyethylene or polypropylene, good ventilation can be obtained and strength can be maintained. It was found that a form was obtained, and the present invention was completed. That is, the present invention provides a freshness preserving agent which is mounted inside a closed container for storing a preservation article and a freshness preserving agent and is provided so as to separate the preservation article and the freshness preserving agent and to store the freshness preserving agent. A storage partition film, wherein the partition film is formed of a plastic sheet shaped body, a plurality of projections are provided on the partition film, and the thickness of the projections is a thickness other than the projections of the partition film. The oxygen permeability of the partition membrane is 1,000 to 30,000 cc / m ² · atm · 24 hr (2
(5 ° C., 60% RH). The partition membrane used in the present invention, in order to separate the freshness retaining agent and the article to be stored contained in a closed container,
It is mounted inside the container. In the present invention, an air-permeable shaped body is used as the partition membrane. In general, when the air-permeable shaped body is mounted on the container body, the air-permeable shaped body is mounted so as to have a convex shape toward the article storage section. On the side of the freshness retaining agent storage section, the freshness retaining agent is generally stored in a space formed by the concave shaped body and the wall of the container. In the present invention, as the material of the partition film, a plastic sheet made of polyethylene or polypropylene, preferably polypropylene is used. The thickness of the plastic sheet material is preferably in the range of 100 μm to 2,000 μm in consideration of the strength and rigidity of the partition film, the shaping property when providing the projections for imparting air permeability, and the workability. The range is more preferably from 150μ to 1,500μ. The partition film of the present invention is provided with a plurality of protrusions by shaping in order to impart good air permeability to the plastic sheet, and furthermore, the film thickness of the protrusions of the plastic sheet However, those processed so as to be smaller than the film thickness other than the protrusions are used. The projection provided on the partition membrane may be convex or concave toward the storage article storage section inside the closed container, but may be convex in view of workability at the time of shaping and the freshness retaining agent storage state. Is preferably provided. The shape of the protrusion is not particularly limited, and may be a hemisphere, a column, a trapezoid, a prism, a cone, or the like, and a hemisphere or a column is preferable from the viewpoint of workability. In the partition film of the present invention, good air permeability is provided by providing the protrusions as described above so that the film thickness of the protrusions is small. the permeability 1,000~30,000cc / m ² · atm · 24h
rs is preferred. The thickness of the thinnest portion of the protrusion is preferably 1 to 10 μm, and 2 to 8 μm in order to impart good air permeability to the partition membrane.
Is more preferred. Also, the area of the thin part of the film is
In consideration of the permeability, strength, and rigidity of the partition membrane, the ratio of the area occupied by the portion having a film thickness of 1 to 10 μm to the surface area of the freshness retaining agent partition membrane is preferably in the range of 1 to 50%. , 2 to 40%. In the partition film of the present invention, as a result of the provision of the projections, good air permeability as a freshness retaining agent partition film is imparted. Examples of the shaping method for providing the above-described projections on the plastic sheet material include a vacuum forming method, a blow molding method, an auxiliary plug forming method, and a compression molding method. Among these shaping methods, a vacuum forming method or a compression forming method is preferable. By this shaping step, the sheet material can be used as a breathable shaped body, that is, a partition film for accommodating a freshness retaining agent according to the present invention. In the present invention, in order to shape the sheet material so that a plurality of protrusions are provided, for example, there is a method in which the sheet material is heat-formed so that the protrusions are partially provided. And while providing the projections in the shaping or molding operation added to such a sheet material, if necessary, to give a sheet material to be shaped to have an appropriate shape and thickness so as to be able to store a freshness preserving agent, The resulting shaped body can also have strength and rigidity. When a compression molding method is used as a method for shaping the sheet material, a temperature of 60 to 200 ° C., preferably 70 to 150 ° C., is used.
1-5 kg / cm ^2, preferably at a pressure of 0.3~3kg / cm ^2, 0.1~1
The reaction is performed for 20 seconds, preferably for 0.2 to 90 seconds. When using the vacuum forming method, 60 to 200 ° C., preferably 7 to 200 ° C.
At a temperature of 0 to 150 ° C, 100 to 730 mmHg, preferably 200 to 700
The reaction is performed under a reduced pressure of mmHg for 0.1 to 90 seconds, preferably 1 to 120 seconds. The container used in the present invention has a structure that can be hermetically sealed, and the closed container used in the present invention may be any one having a structure that can shut off the inside of the container from outside air, such as metal and glass. , Plastic, a laminate of paper and plastic, ceramics, and the like. The shape of the container is, for example, cylindrical, prismatic, tray-shaped, or the like. In the present invention, examples of the freshness retaining agent stored in the freshness retaining agent storage section include a desiccant, a preservative, an insect repellent, a deodorant, an ethylene absorbent, and an oxygen scavenger. The oxygen scavenger is not particularly limited as long as it has an action of absorbing oxygen.Sulfite, bisulfite, dithionite, ferrous salt, hydroquinone, catechol, resorcinol, pyrogallol, gallic acid Contains oxygen powder containing Rongalit, ascorbic acid and / or its salt, isoascorbic acid and / or its salt, sorbose, glucose, lignin, dibutylhydroxytoluene or butylhydroxyanisole, or metal powder such as iron powder An oxygen scavenger containing ascorbic acid and / or its salt, isoascorbic acid and / or its salt, or iron powder is preferably used. Of these, oxygen absorbers containing iron powder are particularly preferably used. Further, a carbon dioxide-generating type oxygen absorber or a carbon dioxide absorbing type oxygen absorber can be used. The form of the oxygen absorber to be stored in the shaped body is not particularly limited, but preferably, a mixture of the above-described oxygen absorber compositions as a powder mixture, and the oxygen absorber composition is formed into a tablet or the like. And a sheet formed by various methods, and a package obtained by filling and packaging a composition of an oxygen scavenger in a small bag made of a breathable packaging material. [Operation] The interior of the closed container is divided into a freshness-retaining agent storage section and an article storage section by the freshness-retaining agent storage partition film in the present invention. The freshness preserving agent storage section can store the freshness preserving agent, and is separated from the object to be preserved by the partition film. The air permeability of the shaped body of the present invention is such that a projection is provided on the partition film, and since there is a portion where the thickness of the partition film is thin at the projection portion, good air permeability is imparted to the partition film. I have. Since the freshness retaining agent storage partition film of the present invention is a specially processed plastic sheet as described above,
When this is used as a partition film between the freshness-retaining agent storage section and the article storage section of the closed container and the freshness-retaining agent is stored in the freshness-retention agent storage section, the partition membrane has good air permeability, and the effect of the freshness-retaining agent is exerted. Is effectively exerted, and the articles to be preserved stored in the container are suitably preserved. [Exemplary Description by Drawing] Next, the partition film of the present invention will be described with reference to the drawings. FIG. 9 shows a conventional freshness-preserving agent partition film, which is formed of a plastic sheet. However, since the conventional partition film does not have a thin portion, the air permeability is very high. It is bad. On the other hand, FIG. 1 is a front view and a plan view of one embodiment of the partition membrane of the present invention. In FIG. 1, the partition film is provided with a hemispherical projection. The thickness of the hemispherical projection is smaller than the thickness of the portion other than the projection. The partition film is provided with irregularities as appropriate in addition to the protrusions to impart strength and rigidity to the partition film. No. 1-
FIG. A is an enlarged view of the protrusion in FIG. [Application Examples] Next, examples in which the partition film for freshness retaining agent of the present invention is applied to various closed containers will be described with reference to the drawings. FIG. 2 shows an example in which the present invention is applied to a powdery, granular, or strip-like container used for coffee, milk, matcha, pharmaceuticals, and the like. In FIG. 2, reference numeral 1 denotes a partition film for accommodating a freshness retaining agent according to the present invention, that is, a shaped body having air permeability,
2 is a freshness preserving agent, 3 is a storage product, and 4 is a container body.
The container 4 is made of a material such as metal, paper, or plastic. The freshness preserving agent 2 is disposed in a space formed by the air-permeable shaped body 1 and the bottom lid 41 of the container. The peripheral edge of the air-permeable shaped body and the peripheral edge of the bottom cover 41 of the container are overlapped and integrally wound around the bottom edge of the container body 4 to form a sealed portion 411 and hermetically sealed. FIG. 3 shows an example of a container for accommodating a powdery, granular, strip-like or scale-like material, particularly applied to a jar. The container 4 is made of a material such as glass or plastic. The lid 44 of this container is a screw lid type. The freshness preserving agent 2 is disposed in a space formed by the air-permeable shaped body 1 and the container lid 44. The peripheral portion of the air-permeable shaped body is located between the lid 44 of the container and the upper end of the opening of the container body 4. At the periphery of the shaped body, a packing may be provided between the lid 44 and the periphery of the shaped body or between the periphery of the shaped body and the upper end of the opening of the container body. FIG. 4 also shows an example applied to a wide-mouth bottle. The container 4 is made of a material such as glass or plastic. The lid 44 of this container is a screw lid type. The freshness preserving agent 2 is composed of a shaped body 1 having air permeability and a container lid.
The shaped body 1 which is arranged in the space formed by the cover 44 and has air permeability is attached to the back surface of the lid 44. FIG. 5 shows an example in which the present invention is applied to a bottle using a screw cap used for liquid or semi-liquid articles. Container 4
For example, a material made of glass, ceramic, plastic, or the like is used. The freshness preserving agent 2 is disposed in a space formed by the air-permeable shaped body 1 and the screw cap 45, and has the air-permeable shaped body 1.
The peripheral portion is positioned between the back surface of the screw cap 45 and the upper end of the opening of the container body. The application of packing is the same as in the case of FIG. FIG. 6 shows an example in which the present invention is applied to a container for accommodating a powdery, granular, or strip-like material used for coffee, milk, medicine, and the like. In FIG. 6, the container 4 is made of a material such as metal, paper, a laminate of paper and plastic, or plastic. The freshness preserving agent 2 is provided in the space formed by the air-permeable shaped body 1 and the upper lid 46 having the container tightened portion 461.
It is arranged in a form to be placed on. The air-permeable shaped body 1 is fixed by a projection on the inner peripheral wall of the container body 4. FIG. 7 also shows an example in which the present invention is applied to a container for accommodating powdery, granular, or strip-like materials used for coffee, milk, medicines and the like. FIG. 7 shows an example in which the bottom cover 47 has a winding portion 471. EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples. Example 1 A 250 μm thick polypropylene sheet was uniformly heated at 125 ° C. for 13 seconds, and brought into close contact with a mold previously heated to 80 ° C.
Vacuum forming was performed at 0 mmHg for 10 seconds, followed by cooling and blowing with compressed air, and then the sheet was separated from the mold to obtain a partition film shown in FIG. In the above molding operation, this partition film has a diameter of 3 mm and a depth of 1.25 m depending on the shape of the mold.
Eight m projections were provided. The thickness of the projection was 3 to 5 μm. Example 2 The partition membrane obtained in Example 1 was put in a metal can (capacity: 80 ml) having a diameter of 55 mm and a height of 40 mm with a deoxidizer (Ageless Z-20, manufactured by Mitsubishi Gas Chemical Co., Ltd.) as shown in FIG. The container was put in, wrapped and sealed, and the oxygen concentration in the can was measured over time. The results are shown in Table 1. Comparative Example 1 In the molding operation of Example 1, except that a mold having a shape in which a sheet was not provided with a protrusion was used in the same manner as in Example 1 and did not have the protrusion shown in FIG. A partition membrane was obtained. Instead of using the partition membrane produced according to Example 1,
Example 2 except that the partition film having no protrusion was used.
The oxygen concentration in the can was measured in the same manner as described above. The results are shown in Table 1 together with Example 2. Example 3 The partition membrane obtained in Example 1 and an oxygen absorber "Ageless Z-20" (trade name, manufactured by Mitsubishi Gas Chemical Co., Ltd., size) were prepared, and 120 g of soybean powder (yellow powder) was stored. 55mm in diameter, depth
In a cylindrical metal can of 40 mm, housed so that the oxygen scavenger is loaded in the space formed by the metal lid of the metal can and the shaped body having air permeability, and the peripheral edge of the flange of the partition membrane. The outer periphery of the metal lid was sealed by overlapping and winding.
(Refer to Fig. 8) Store the above sealed cans at 25 ° C and adjust the oxygen concentration in the system to 0.1%.
(Hereinafter, the time when the oxygen concentration in the system reaches 0.1% is referred to as deoxidation time), the change over time in the peroxide value of the oil and fat contained in the soybean flour, and the flavor were measured. The results are shown in Table 2. Comparative Example 2 Example 3 was repeated except that no oxygen scavenger was used.
A storage test of soybean flour was performed in the same manner as described above. The results are shown in Table 2 together with Example 3. [Effect of the Invention] The partitioning membrane for storing freshness retaining agent of the present invention is used to separate the article storing section and the freshness retaining agent storing section of the closed container, but has a breathability and excellent water resistance, so that it can be stored. The freshness of the article can be suitably maintained. The conventional partition film made of a plastic sheet material has a drawback in that the gas permeability of oxygen and the like is small, but the partition film for storing a freshness-retaining agent of the present invention has a plurality of projections and has an extremely thin portion, so that the gas has a disadvantage. High permeability. Also,
The strength and rigidity required for use are maintained, and the storing property of the freshness retaining agent is also good. When the freshness-retaining agent-containing partition film of the present invention is used, the freshness-retaining agent does not come into contact with various articles such as food, and has gas permeability, so that the freshness-retaining effect for foods is effectively exhibited. You. Furthermore, conventionally, in the case of powdered foods or liquid foods, if the foods and the freshness preserving agent come into direct contact, the appearance of the freshness preserving agent is impaired, or the food is transferred to the freshness preserving agent side and is transferred and stained. In some cases, problems such as migration of the freshness-maintaining agent component to the food side may occur.However, the use of the partitioning membrane for storing a freshness-maintaining agent of the present invention solves all of the above problems. Can be. The partitioning membrane for storing a freshness retaining agent of the present invention is a high moisture food,
Various freshness for preserving various forms of food such as fine powder, powder, powder, granules, granules, flakes, scales, liquid and semi-liquid foods, as well as various forms of pharmaceuticals, and other items to be preserved It can be suitably used in combination with a holding agent.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view and a plan view showing one embodiment of a partition film of the present invention. FIG. 1-A is an enlarged view of a projection in the partition film of the present invention shown in FIG. FIGS. 2, 6 and 7 are cross-sectional views showing examples in which the partition film for accommodating a freshness preserving agent according to the present invention is applied to a container made of metal, plastic or the like. FIG. 3 and FIG. 4 are cross-sectional views showing an example in which the partition film for accommodating a freshness preserving agent according to the present invention is applied to a wide-mouth bottle container made of glass, plastic or the like. FIG. 5 is a cross-sectional view showing an example in which the partitioning film for accommodating a freshness retaining agent according to the present invention is applied to a bottle container made of glass, plastic, ceramics or the like of a screw cap type. FIG. 8 is a cross-sectional view showing an example in which the partition film for storing a freshness retaining agent according to the present invention is applied to a metal can. FIG. 8 is a cross-sectional view showing an embodiment of the use of the freshness-retaining agent storing partition film according to the present invention exemplified in the third embodiment. FIG. 9 is a sectional view showing a conventional freshness retaining agent partition film. In the drawing, 1 ... a partition film for storing a freshness-retaining agent (a shaped body having air permeability) 11 ... a seal portion of a partition film for storing a freshness-retaining agent 12 ... a seal portion 2 of a partition film for storing a freshness-retaining agent ... Freshness retainer 3 Preserved article 4 Container 41 Container bottom lid 411 Winding part 44 Lid 45 Screw cap 46 Top lid 461 Winding part 47 Bottom lid 471 ... Indicates the tightening part.

Claims (1)

(57) [Claims] A partitioning film for storing freshness-retaining agent, which is provided so as to isolate the storage product and the freshness-retaining agent mounted inside the closed container for storing the preservation item and the freshness-retaining agent and to store the freshness-retaining agent. The partition film is formed of a plastic sheet shaped body, the partition film is provided with a plurality of projections, and the thickness of the projections is smaller than the thickness of the partition film other than the projections. The thickness of the thinnest portion of the projection is in the range of 1 to 10 μm, and the ratio of the area occupied by the portion having the thickness of 1 to 10 μm is in the range of 1 to 50% with respect to the surface area of the partition film. , The oxygen permeability of the partition membrane is 1,
A partition film for storing a freshness-retaining agent, characterized in that it has a range of 000 to 30,000 cc / m ² · atm · 24 hr (25 ° C., 60% RH).