JP2011088664A - Paper box for maintaining freshness - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper box for maintaining freshness which can be manufactured simply, easily and abundantly at a low cost and which can maintain freshness of a contained perishable food certainly. <P>SOLUTION: A freshness maintaining film 5, which is a plastic film for maintaining freshness of the perishable food, is laminated on the inner surface of the paper box for maintaining freshness. Since the freshness maintaining film, which is manufactured by processing in a film shape, is laminated on the inner surface of a paper plate of the paper box without coating on the paper plate, the film has a uniform thickness and is manufactured abundantly in a state with freshness maintaining function and an ideal freshness maintaining function can be materialized. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a freshness-keeping paper box capable of holding fresh food in a box and maintaining the freshness.

Boxes that maintain the freshness of the fresh food they store have been developed. (See Patent Documents 1 to 4)
Patent Document 1 describes a cardboard box that can maintain the freshness of fruits and vegetables. This cardboard box has a unique configuration of liners that form the inner and outer surfaces. The liner has a coating layer formed of a moisture-proof paint containing a granular pigment having an aspect ratio of 3 or less and an average particle diameter of 5 to 15 μm, a flat pigment having an aspect ratio of 5 or more, and a synthetic resin emulsion on the liner base paper. Has a moisture-proof liner. Further, the moisture-proof liner has a moisture permeability (JIS Z 0208) of 300 g / m ² · 24 h or less and a Cobb water absorption (JIS P 8140) of 5 g / m ² · 2 minutes or less.

  Patent Document 2 also describes a cardboard box having a freshness maintaining function. This corrugated cardboard box has a moisture barrier layer whose moisture permeability changes according to the amount of water that evaporates from the goods stored in the box on the inner liner surface. This cardboard box has a moisture-proof agent layer formed on the inner liner surface by a moisture-proof agent containing a synthetic resin emulsion emulsified by emulsion polymerization of a radical polymerizable monomer with a polymer emulsifier and an aqueous wax emulsion. .

  Patent Document 3 describes a paperboard paper box. In this paper box, a waterproof coating that prevents water from penetrating into the blank is applied to both sides of the blank, and the waterproof coating contains a freshness-preserving agent that maintains the freshness of the organism. Titanium oxide that decomposes ethylene gas is used as a photocatalyst for the freshness-keeping agent.

Japanese Patent Laid-Open No. 2005-67629 Japanese Patent Laid-Open No. 2001-180662 JP-A-11-255232

  In the paper box described in the above publication, a coating layer is provided by applying a material having a freshness maintaining function to the surface of a cardboard box or paperboard. Since this paper box is provided with a special coating layer on the surface of the cardboard box or the like, not only does it take time and effort to increase the manufacturing cost, but it is also difficult to provide a coating layer with a uniform film thickness on the surface.

  The present invention has been developed for the purpose of solving this drawback. An important object of the present invention is to provide a freshness-keeping paper box that can reliably keep freshness of fresh food that is produced and stored in large quantities at a low cost, simply and easily.

Means for Solving the Problems and Effects of the Invention

  The freshness-holding paper box of the present invention has a freshness-holding film 5 that is a plastic film that holds the freshness of fresh foods laminated on the inner surface.

  The above-described freshness-keeping paper box has a feature that it can easily and easily keep freshness of fresh foods that are produced and stored in large quantities at a low cost. This is because a coating layer having a freshness maintaining function is not applied to the surface of the paper box, but a freshness maintaining film manufactured separately from the paper box can be laminated on the inner surface of the paper plate of the paper box. A freshness-keeping film produced by processing into a film without being applied to a paper plate can be mass-produced in a state having a uniform film thickness and a freshness-holding function. Since the freshness-keeping film manufactured in this state is laminated on the inner surface of the paper box, the above-described freshness-keeping paper box has a feature that it can be mass-produced at low cost while realizing an ideal freshness-holding function.

In the freshness-holding paper box of the present invention, the freshness-holding film 5 can be laminated so that moisture can permeate from the inside of the paper box 1 toward the paper plate 4 of the paper box 1.
In the above freshness-keeping paper box, a freshness-holding film is laminated on the inner surface of the paper plate of the paper box so that moisture can permeate. Moreover, dew condensation can be prevented by allowing moisture to permeate.

The freshness-keeping paper box of the present invention includes a freshness-keeping film 5, a plastic film that emits far-infrared rays, a plastic film that removes ethylene gas, a plastic film that has a permeation amount of oxygen gas within a specific range, and moisture transmission The amount can be any plastic film with a specific range.
The freshness-keeping paper box, which is laminated with a freshness-holding film that emits far-infrared rays, has the feature that it can keep freshness by activating the water of fresh food by the emitted far-infrared rays. In addition, the freshness-keeping paper box, which is laminated with a freshness-keeping film that absorbs ethylene gas, absorbs or decomposes the ethylene gas generated when fruits and vegetables ripen, and lowers the concentration of ethylene gas in the box to maintain freshness. Can be held. When the concentration of ethylene gas in the paper box increases, the ripening of fruits and vegetables progresses and the freshness decreases. However, this freshness-holding film absorbs ethylene gas and prevents a decrease in freshness. Furthermore, the freshness-keeping paper box, which is laminated with a freshness-keeping film with a specific range of oxygen gas permeation, has oxygen gas permeation that keeps breathing of fruits and vegetables to a minimum without permeating bacteria and bacteria. By doing so, the freshness is maintained. Furthermore, a freshness-keeping film having a moisture permeation amount in a specific range achieves freshness preservation by permeating moisture generated by respiration of fruits and vegetables and releasing it to the outside.

In the freshness-keeping paper box of the present invention, the freshness-holding film 5 has translucency, and characters and figures 6 can be printed between the paper plate 4 and the freshness-holding film 5 of the paper box 1.
The above paper box prints characters and figures between the paper plate of the paper box and the freshness-preserving film, so the printing ink does not come into contact with the stored fresh food, and the characters and figures are displayed clearly and clearly. it can.

In the freshness-keeping paper box of the present invention, the freshness-keeping film 5 can be laminated with an adhesive so as to allow moisture to permeate, or can be laminated by heat welding to allow moisture to permeate.
In the freshness-keeping paper box in which the freshness-keeping film is laminated with an adhesive, the freshness-keeping film can be easily laminated on the inner surface of the paper box. Further, in the freshness-keeping paper box in which the freshness-keeping film is heat-welded and laminated, the adhesive layer does not inhibit moisture permeation, so that the freshness-keeping film can be laminated on the inner surface of the paper box while smoothing the moisture permeation.

In the freshness-keeping paper box of the present invention, the freshness-holding film 5 can be laminated in a state that allows moisture to permeate both the inner surface and the outer surface of the paper box 1.
Since the freshness-keeping paper box has a freshness-keeping film laminated on both sides, both the inner surface and the outer peripheral surface of the paper box can be finished with a beautiful display.

  In the freshness-keeping paper box of the present invention, the fresh food to be stored can be any of fruits and vegetables, fresh fish, meat, and salmon.

  In the freshness-keeping paper box of the present invention, the paper plate 4 forming the paper box 1 can be either paperboard or cardboard.

It is a perspective view of the freshness preservation paper box concerning one example of the present invention. It is a disassembled perspective view of the freshness-keeping paper box shown in FIG. It is a partially expanded sectional view of the freshness-keeping paper box shown in FIG. It is a perspective view of the freshness preservation paper box concerning other examples of the present invention. It is a disassembled perspective view of the freshness maintenance paper box shown in FIG. It is a partially expanded sectional view of the freshness-keeping paper box shown in FIG.

  Embodiments of the present invention will be described below with reference to the drawings. However, the example shown below illustrates the freshness-keeping paper box for embodying the technical idea of the present invention, and the present invention does not specify the freshness-holding paper box as follows.

  Further, in this specification, in order to facilitate understanding of the scope of claims, numbers corresponding to the members shown in the examples are indicated in the “claims” and “means for solving problems” sections. It is added to the members. However, the members shown in the claims are not limited to the members in the embodiments.

  The freshness-keeping paper box shown in FIGS. 1 to 6 has a freshness-holding film 5 laminated on the inner surface of the paper box 1. In the paper box 1 in these figures, the paper plate 4 is processed into a box shape. The paper box 1 shown in the figure includes a box body 2 that opens upward and a lid 3 that closes the opening of the box body 2. The box body 2 of the paper box 1 shown in FIGS. 1 to 3 has a bottom plate 2A as a disc shape, and a cylindrical peripheral wall 2B is fixed around the bottom plate 2A. The peripheral wall 2B is tapered so that the inner diameter increases toward the opening. The lid 3 has a cylindrical outer peripheral wall 3B fixed around a disc-shaped top plate 3A. The outer peripheral wall 3B has an inner diameter slightly larger than the maximum outer diameter of the peripheral wall 2B so that the peripheral wall 2B of the box body 2 can be inserted inside. The box body 2 of the paper box 1 shown in FIGS. 4 to 6 includes a peripheral wall 2B around a square bottom plate 2A. The lid 3 is provided with an outer peripheral wall 3B that guides the peripheral wall 2B inwardly around a rectangular top plate 3A.

  The above paper box 1 uses paperboard for the paper plate 4. The paper box 1 can have a sturdy structure by thinning the paper plate 4. In the paper box 1, a freshness-keeping film 5 is laminated on the inner surface of a paperboard that is a paper plate 4. The paper box 1 can keep the fresh food to be stored fresh by laminating the freshness-keeping film 5 on the inner surface thereof. The paper box 1 shown in FIG. 3 has a freshness-keeping film 5 laminated on both the inner surface and the outer surface. In this way, the paper box 1 in which the freshness-keeping film 5 is laminated on the outer surface can be made a smooth surface with the freshness-keeping film 5 on the outer surface. However, as shown in FIG. 6, the paper box 1 can be laminated with the freshness-keeping film 5 only on the inner surface. The above paper box 1 uses paperboard for the paper plate 4, but corrugated paper can also be used for the paper plate 4.

  The freshness-keeping film 5 is a plastic film that has already been developed or will be developed as a plastic film that can be packaged with fresh food to keep freshness. The freshness-keeping film 5 is a freshness-keeping anti-fogging OPP film sold by Tosero Co., Ltd. under the trade name “Spash (registered trademark)”. This freshness-keeping film 5 is a plastic film containing fine inorganic powder that emits 4 to 16 μm far-infrared rays, and activates the water of fresh food by the emitted far-infrared rays to keep the freshness. Moreover, dew condensation is prevented by allowing moisture to permeate, and freshness of fresh food is maintained by absorbing ethylene gas and reducing the concentration of ethylene gas.

  However, the freshness-keeping paper box of the present invention does not specify the freshness-keeping film as “Spash (registered trademark)”, and any plastic film that can package fresh food and keep freshness, for example, emits far infrared rays to Plastic film that activates, plastic film that removes ethylene gas, plastic film that limits oxygen gas permeation to a specific range, plastic film that limits moisture permeation to a specific range, Plastic films that have functions can also be used.

  The freshness-keeping film 5 is laminated on the surface of the paper plate 4 in the previous step of processing into the paper box 1, or after being processed into the paper box 1, it is laminated on the inner surface and the outer surface. The method of laminating the freshness-keeping film 5 on the paper plate 4 in the previous process of processing into the paper box 1 enables the freshness-keeping film 5 to be stably and efficiently laminated on the paper plate 4. Moreover, the method of processing the paper box 1 and laminating it on the inner surface or the outer surface can laminate the freshness maintaining film 5 without any gap.

  The freshness-keeping film 5 is laminated in a state that allows moisture to permeate the surface of the paper plate 4 through an adhesive. In this method, for example, an adhesive is sprayed on the surface of the paper plate 4, and the freshness-keeping film 5 is adhered and dried in an uncured state of the adhesive. In this method, the amount of adhesive sprayed is controlled to adjust moisture permeation from the freshness-keeping film 5 to the paper plate 4. If the spray amount of the adhesive is too large, an adhesive layer that does not allow water to permeate between the freshness-keeping film and the paper plate is formed. If the spray amount of the adhesive is reduced, the adhesive layer becomes thin, and an infinite number of pinholes are formed, which becomes a layer that allows moisture to permeate. In addition, in a freshness-keeping paper box that uses a plastic film that controls the permeation amount of oxygen gas for the freshness-keeping film, an adhesive layer that allows oxygen gas to permeate is provided. A freshness-holding paper box that laminates a freshness-holding film that has a specific amount of moisture and oxygen gas permeation is used to increase the amount of moisture and oxygen gas that permeate through the adhesive layer. The amount of transmission is controlled with a freshness-keeping film. Since the amount of moisture and oxygen gas permeated through the adhesive layer varies depending on the amount of adhesive sprayed, this freshness-keeping paper box can reduce the amount of adhesive sprayed, and the adhesive layer can absorb moisture and oxygen gas more than the freshness-holding film. Adjust to allow a large amount of permeation.

  The freshness-keeping film 5 can be laminated on the paper plate 4 by dry lamination. In this method, an adhesive made of a thermoplastic resin that is heated and melted is sprayed on the surface of the paper plate 4 or the surface of the freshness-keeping film 5, and after the adhesive is cured, the freshness-keeping film 5 is laminated. Then, this is heated to melt the adhesive and laminate.

  The paper box 1 has characters and figures 6 printed on the inner surface and surface of the paper plate 4. This paper box 1 can be laminated with a translucent freshness-keeping film 5 on the surface to be printed, and the freshness-keeping film 5 can make the printed surface beautiful and smooth. Further, by laminating with the freshness-preserving film 5, printed characters and figures 6 can be coated with a beautiful glossy wet color. Furthermore, by printing characters and graphics 6 on the inner surface of the paper box 1 and laminating the freshness-keeping film 5 on the surface, it is possible to prevent the printing ink from coming into direct contact with fresh food. The freshness-keeping paper box can also be printed on the inner surface of the freshness-keeping film with characters and figures and laminated on the inner and outer surfaces of the paper box.

  The freshness-keeping paper box of the embodiment of the present invention in which the paperboard is formed in the box shape shown in FIGS. 1 to 3 and “Spash (registered trademark)” is laminated on the inner surface thereof, for example, stores green soybeans at 20 ° C. for 4 days. And packed in a tasty state without changing color. In addition, after 3 days, the concentration of ethylene gas in the freshness-keeping paper box was 300 ppm or less. On the other hand, the green soybeans stored under the same conditions in the paper box of the comparative example without laminating “Spash (registered trademark)” lost water, partially browned, and the flavor was lowered. However, the freshness-keeping paper box of the example used for this test was tested by closing the opening of the box body 2 with the lid 3 so that the air inside the box body 2 was not freely ventilated, as shown in FIG. For comparison, instead of “Spash (registered trademark)” on the inner surface of the paper box, the paper box laminated with an OPP film that does not have a freshness-keeping function exceeds 3000 ppm in the box after 3 days. After a lapse of 4 days, part of the color was browned and the flavor was lowered.

1 ... paper box 2 ... box body 2A ... bottom plate
2B ... Peripheral wall 3 ... Lid 3A ... Top plate
3B ... Outer peripheral wall 4 ... Paper plate 5 ... Freshness keeping film 6 ... Character and figure

Claims (8)

  A freshness-keeping paper box in which a freshness-keeping film (5), which is a plastic film for keeping freshness of fresh food, is laminated on the inner surface.   The freshness-keeping paper box according to claim 1, wherein the freshness-keeping film (5) is laminated so that moisture can permeate from the inside of the paper box (1) toward the paper plate (4) of the paper box (1).   The freshness-preserving film (5) is a plastic film that emits far-infrared rays, a plastic film that removes ethylene gas, a plastic film that has an oxygen gas permeation amount in a specific range, and a moisture permeation amount in a specific range. The freshness-keeping paper box according to claim 1, wherein the paper sheet is a plastic film.   The freshness-keeping film (5) has translucency, and characters and figures (6) are printed between the paper plate (4) of the paper box (1) and the freshness-keeping film (5). A freshness-keeping paper box described in any one of 3 to 3.   The freshness-retaining film according to any one of claims 1 to 4, wherein the freshness-holding film (5) is laminated with an adhesive so as to allow moisture to permeate, or is heat-welded and laminated so as to allow moisture to permeate. Holding paper box.   The freshness-keeping paper box according to any one of claims 1 to 5, wherein the freshness-keeping film (5) is laminated so that moisture can permeate both the inner and outer surfaces of the paper box (1).   The freshness-keeping paper box according to any one of claims 1 to 6, wherein the fresh food to be stored is any one of fruits and vegetables, fresh fish, meat, and salmon.   The freshness-preserving paper box according to any one of claims 1 to 7, wherein the paper plate (4) forming the paper box (1) is either paperboard or cardboard.

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