JPH0651163U - Packaging materials for vegetables - Google Patents

Abstract

(57) [Summary] [Purpose] It suppresses the drying and yellowing of fruits and vegetables, and also suppresses the generation of "dullness" and "skulls" due to the dew condensation water that forms in the package, and has a high commercial value for a long time. Provide a packaging material that maintains [Composition] A packaging material in which a thermoplastic resin layer is integrally laminated and adhered to the surface of a paper sheet, and the other surface of the paper sheet is coated with a paint containing a persimmon fruit juice deodorant. To use.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a packaging material suitable for packaging vegetables, fruits, fruits and the like, particularly vegetables.

[0002]

[Prior art]

 The aging phenomenon of vegetables progresses after harvesting, and changes such as "wiring", yellowing, "kusare", and "sluke" occur rapidly due to water evaporation. For example, broccoli and green asparagus are green vegetables whose production has increased in recent years, but they rapidly age during transportation or storage, causing the above-mentioned changes and significantly reducing their commercial value. .

[0003] It is generally possible to suppress the yellowing, "dullness", "slipping" and other quality deterioration phenomena by lowering the temperature in the package, increasing the carbon dioxide concentration in the atmosphere, and decreasing the oxygen concentration. Are known.

Further, in order to prevent a decrease in water content due to evaporation of water, which is a cause of “wiring” of fruits and vegetables, a container made of a material having a low water vapor permeability is used.

In this case, water droplets of the dew condensation water are attached to the wall surface in the box and the water is accumulated, and the spoilage bacteria are propagated by the water to cause “dampening” and “slipping”, resulting in fruits and vegetables. It is also well known to cause damage.

On the other hand, in a vegetable container with improved gas permeability, the carbon dioxide concentration rises, and odorous volatile components such as aldehydes and alcohols are generated in apnea fruits and vegetables, which may cause damage. It will occur, and eventually the commercial value will be reduced.

[0007]

[Problems to be Solved by the Invention] The present invention prevents the phenomenon of extreme decrease and increase of oxygen and carbon dioxide gas in order to suppress the aging phenomenon such as drying and yellowing of vegetables and fruits described above. , The barrier property other than water is reduced, moisture evaporation is moderately prevented without extremely suppressing the breathing action of fruits and vegetables, and the dew condensation water generated in the package is reattached to the fruits and vegetables and is “scraped” or “slipped”. It is intended to provide packaging materials that suppress the occurrence of "ke" etc. and maintain high commercial value for a long time.

[0008]

[Means for Solving the Problems]

 According to the present invention, a thermoplastic resin layer is integrally laminated and adhered to one side of a paper sheet or the middle of two paper sheets, and one side of the paper liner sheet is not fractionated as a deodorant. Persimmon fruit squeezed juice itself, or sugar-free juice squeezed juice obtained by removing sugar from the juice, or a coating containing a dehydrated concentrate thereof (hereinafter, abbreviated as deodorant / antibacterial / antifungal agent) package It uses materials.

The paper sheet used in the present invention preferably has a weight of 20 to 320 g / m ² , and in some cases, the laminated sheet of the present invention may be used as a corrugated liner.

As the thermoplastic resin layer, it is not always necessary to use one having a high gas barrier property, and a stretched or unstretched film or coating layer of polyolefin such as polyethylene or polypropylene, polystyrene, polybutadiene, polyamide, polyester or the like. Etc. are used, and those having a thickness of 5 to 20 μ are preferable.

The paper sheet may be coated with a fine metal powder together with the deodorant / antibacterial / antifungal agent to block radiant heat. The fine metal powder-containing paint to be applied is a water-based paint or an oil-based paint containing a fine metal powder having a total emissivity of 0.005 to 0.5 at room temperature in the wavelength region of 0.7 μ to 100 μ and a resin for adhesion. Either is fine.

[0012] Examples of the fine metal powder showing the above-mentioned total emissivity include aluminum, copper, zinc, silver, gold, and the like, and as an adhesive resin for applying these to a paper sheet, polyvinyl acetate, polyvinyl acetate, etc. A wide range of water-based or solvent-based paint binders such as alcohols, polyacrylates, and rubber resins can be used. The coating amount should be such that the surface of the paper sheet exhibits a metallic luster.

By providing the above resin layer, the water vapor or water permeability of the paper sheet can be blocked, and the inclusion of the metal fine powder can block the heat insulating property, especially the radiant heat, and the aging reaction. Can be suppressed.

The above-mentioned paint absorbs and adsorbs odorous substances generated during the aging reaction of vegetables such as ammonia, trimethylamine, hydrogen sulfide, mercaptans, alcohols, aldehydes, etc. Add agent.

As for the deodorant / antibacterial / antifungal agent, the inventor of the present invention has proposed that a persimmon fruit juice-containing substance, that is, a persimmon fruit juice itself not subjected to fractionation treatment, or a sugar-free juice extract obtained by removing sugar from the juice. It has also been found that it is extremely effective to include dehydrated concentrates thereof. By adding this deodorant / antibacterial / antifungal agent, the malodor generated by the aging effect of vegetables can be almost completely eliminated.

Further, by adding the deodorant / antibacterial / antifungal agent, sterilization / antibacterial action against harmful substances such as dew condensation water generated on the inner wall of the package and harmful fungi in the condensed water accumulated on the bottom of the package, It has an antifungal effect and suppresses the "dullness" and "slipping" phenomena of fruits and vegetables. This deodorant / antibacterial / antifungal agent is also excellent in that it is non-toxic. The addition amount is preferably 0.1 to 10% by weight with respect to the coating material.

The paper sheet and the thermoplastic resin layer may be laminated and adhered by an ordinary method using an adhesive, or by melt extrusion of the thermoplastic resin.

The packaging material of the present invention wraps vegetables and the like in a bag shape or a box shape. In the case of packaging, it is preferable to use the deodorant / antibacterial / antifungal agent-containing layer on the inside for close proximity to fruits and vegetables.

[0019]

[Action]

 The packaging material of the present invention can be used not only as a bag or box shape with a paper liner sheet itself, but also as a cardboard sheet by using the paper liner sheet as a constituent component, and as a cardboard box or as a bag, Fruits and vegetables can be packed as an inner bag.

During packaging, by using the deodorant / antibacterial / mold / mildew containing layer on the inside, the action of the persimmon juice deodorant / antibacterial / mold / mildew agent described above causes aging. It is possible to almost completely eliminate the foul odor that is generated and enhance the commercial value.

Further, the deodorant / antibacterial / antifungal agent on the surface of the box inner wall liner is not only effective for deodorizing but also deodorizing in the water in the dew condensation water accumulated on the inner wall of the box and the bottom. It is possible to sterilize spoilage fungi and "molds" to prevent spoilage, "dullness" and "wiring" of fruits and vegetables.

If a metal-containing layer is further provided, radiant heat can be blocked and the temperature rising rate in the container can be increased to suppress respiratory metabolism.

[0023]

【Example】

 The invention will now be further described with reference to the drawings.

FIG. 1 is a cross-sectional view showing an example of the packaging material of the present invention, in which a thermoplastic resin layer 2 is integrally laminated and adhered on one surface of a paper sheet 1 and persimmons on the other surface. A squeezing liquid type deodorant / antibacterial / antifungal agent-containing paint layer 3 is integrally provided.

FIG. 2 is a cross-sectional view showing another example of the packaging material of the present invention, in which one side of the paper sheet 1 is a thermoplastic resin layer 2 and the other side is a persimmon juice deodorant / antibacterial / antibacterial agent. A paper sheet 4 is further integrally laminated on the surface of the thermoplastic resin layer 2 of the laminated sheet of FIG. 1 on which the antifungal agent-containing paint layer 3 is integrally laminated, and further on the other surface of the paper sheet 4. A coating layer 5 containing a persimmon juice-based deodorant, antibacterial and antifungal agent is integrally provided.

Further, FIG. 3 is a cross-sectional view showing an example of a corrugated cardboard sheet as the packaging material of the present invention, which is a coating layer 3 containing metal fine powder and persimmon juice deodorant / antibacterial / antifungal agent. A paper liner sheet 4, a corrugated sheet 6 and a paper liner sheet 7 are further laminated and adhered to the other surface of the thermoplastic resin layer 2 of the laminate of the present invention comprising a paper sheet 1 and a thermoplastic resin layer 2. It shows a corrugated cardboard sheet. Placing the paper liner sheet 4 facilitates the bonding of the corrugated sheet 6.

Next, the present invention will be further described with reference to examples.

Example 1 A low-density polyethylene (15μ) resin layer was sandwiched between a light wrapping paper (70 g / m ² ) and a cardboard paper liner sheet (180 g / m ² ), and three members were laminated and fused. . Composition of 100 parts by weight of aluminum powder, 60 parts by weight of PVA adhesive resin, 0.3% by weight of persimmon fruit juice not fractionated, and 600 parts by weight of water on the surface of this laminated sheet on the side of light wrapping paper Was applied with a high-speed mixer to apply a sufficiently mixed paint.

Further, a corrugated sheet and a paper liner sheet were laminated and adhered in this order on the surface of the cardboard sheet sheet by a corrugating machine to prepare a cardboard sheet (A).

For comparison, a corrugated sheet of the same material was sandwiched between the two liner sheets used for the corrugated cardboard sheet and laminated integrally (the fine metal powder containing layer and the polyethylene film layer are not provided). ) Prepare a normal corrugated cardboard sheet (B) and foamed polystyrene board (50 times foamed, 15 mm thick) (C), and from three parties, direct the layer containing the fine metal powder toward the inner surface of the box to form a packaging box with a lid of the same structure. Created.

Broccoli of the same degree of freshness was pre-cooled to 3 ° C. and packed in these three types of packaging boxes, and allowed to stand in an atmosphere of 28 ° C. and 60% RH for 48 hours, and then the state of change was observed.

As a result, the reduction rate of water content in broccoli was (A) 4.52%, (B) 9.6 1%, (C) 4.02%, and there was a large difference between (A) and (C). However, (B) has a significantly large evaporation of water.

No color change of broccoli was observed at all in (A) and (C), but in (B), yellowing was remarkable.

Next, when the odor occurrence situation was compared, (A) smells like broccoli itself, but does not give off any bad odor, and the rot phenomenon such as "dull" or "skull" of broccoli is recognized. I couldn't do it. On the other hand, in (B) and (C), the box was filled with a bad odor, and the phenomenon of "slipping" was observed, and in (B), the phenomenon of "weaning" was particularly serious.

Further, comparing the condensed water, (A) is not absorbed and accumulated in each layer of the corrugated cardboard sheet.

In (A), dew condensation water was accumulated in the box, but due to the action of the persimmon squeezing liquid deodorant, the dew condensation water was kept in an extremely clean state, and the broccoli also retained a very good freshness. .

On the other hand, in (C), dew condensation water was accumulated in the box, and refluxed and adhered to broccoli to generate a bad odor and "dullness".

Separately, the “mold” resistance test of the cardboard sheet (A) coated with the persimmon juice-based deodorant / antibacterial / antifungal agent of the present invention was carried out as a result of a “mold” resistance test. Was found to be extremely excellent in "mold" resistance.

[0039]

【effect】

 As can be seen from the above examples, the packaging material of the present invention is cheaper than expanded polystyrene, which is traditionally the most excellent in preventing yellowing of vegetables such as broccoli, but the condensation water It does not cause spoilage of fruits and vegetables, prevents apnea, does not give off a bad odor, and does not show the decay and aging phenomenon of fruits and vegetables such as broccoli, which causes deterioration of eating quality. There wasn't.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example of a packaging material of the present invention.

FIG. 2 is a cross-sectional view showing another example of the packaging material of the present invention.

FIG. 3 is a sectional view showing an example in which the packaging material of the present invention is formed into a corrugated cardboard sheet.

[Explanation of symbols]

 1 Paper Sheet 2 Thermoplastic Resin Layer 3,5 Paint Layer Containing Metallic Fine Powder 4 Paper Liner Sheet 6 Corrugated Sheet 7 Paper Liner Sheet

Claims (1)

[Scope of utility model registration request] 1. A thermoplastic resin layer is integrally laminated and bonded on one side of a paper sheet or in the middle of two paper sheets, and fractionated as a deodorant on the other surface of the paper liner sheet. A packaging material for vegetables or the like, which is coated with untreated persimmon fruit juice itself, or sugar-free juice obtained by removing sugar from the juice, or a coating containing a dehydrated concentrate thereof.