JP3518797B2 - Film and container for keeping freshness - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin composition for maintaining freshness, which can maintain the freshness of vegetables, fruits and the like for a long period of time.

[0002]

2. Description of the Related Art Agricultural crops such as vegetables and fruits are sold after being harvested, and metabolites such as water and carbon dioxide are accumulated by respiration in the course of time until consumption. This self-generated carbon dioxide reduces the vitality of agricultural products and reduces their value as food. As a solution to these problems, a lot of packaging materials for keeping freshness have been proposed which can keep freshness of packaged vegetables and fruits for a longer period of time.

Conventionally, as a packaging material for keeping the freshness of agricultural products,
For example, a freshness-maintaining packaging material having a porous structure that suppresses respiration of fruits and vegetables by adding fine pores to a resin sheet or film, vinylidene chloride, ethylene vinyl alcohol copolymer, a resin having a high gas barrier property such as polyacrylonitrile. A multi-layered sheet to control the permeation of oxygen and carbon dioxide, and a freshness-preserving packaging material with a multi-layer structure that suppresses the oxidation of the contents, hinokitiol, and antibacterial agents such as wasabi are added to maintain the freshness of fruits and vegetables. An antibacterial agent-containing freshness-maintaining resin composition and the like can be mentioned.

[0004]

However, although the conventional packaging material for keeping freshness can be evaluated in terms of being able to keep the freshness of vegetables, fruits, etc. for a long period of time, the cost and workability thereof are high. And stability is still insufficient. That is, in the packaging material for maintaining freshness having a porous structure, the resin is melt-stretched using a special roll, and then heat-treated and re-stretched. In addition, the equipment is complicated, such as punching with an ultra-fine needle, which is a multi-step process. Also, the freshness-keeping packaging material having a multi-layer structure requires the use of special equipment such as a multi-layer extrusion device. For this reason, the manufacturing equipment for manufacturing these packaging materials for keeping freshness cannot be used for other molded products, which increases the cost. Furthermore, the antimicrobial agent-containing freshness-maintaining resin composition containing hinokitiol or horseradish is
Antibacterial agents are expensive, heat resistance is not sufficient,
In addition, there is a problem that an irritating odor is generated during processing.

Therefore, an object of the present invention is to maintain the freshness of vegetables, fruits and the like, which does not require a special processing machine, is inexpensive, has excellent stability during processing, and can retain the freshness of vegetables and fruits for a long period of time. It is to provide a resin composition.

[0006]

Under such circumstances, as a result of intensive investigations by the present inventors, a resin containing trehalose, which is widely contained in plants and microorganisms and has been eaten by humans as food for many years, has been incorporated. The composition can be manufactured safely and inexpensively, and it is possible to retain the freshness of vegetables, fruits, etc. for a long period of time by using it as a sheet or container for keeping freshness, and to complete the present invention. I arrived.

That is, the present invention relates to polyvinyl chloride,
Tylene-acetic acid copolymer, polyethylene, polypropylene
Resin, polystyrene, ABS resin, polyamide, polyacetate
Tar, polyethylene terephthalate and polycarbonate
Resin and trehalose selected from the group consisting of
To prepare a resin composition and mold the resin composition
A freshness-maintaining film obtained, comprising:
To poly (meth) acrylic acid or poly (meth) acrylic
Does not contain a partially neutralized product of the acid, the trehalose in the resin composition contains 0.1 to 50 wt%, a thickness of 3 to 20
The present invention provides a freshness-keeping film having a thickness of 00 μm . The present invention also relates to polyvinyl chloride.
Polymer, ethylene-acetic acid copolymer, polyethylene, polypropylene
Pyrene, polystyrene, ABS resin, polyamide, poly
Acetal, polyethylene terephthalate and polycarbonate
Resin selected from the group consisting of Bonates and trehalose
To prepare a resin composition and mold the resin composition.
A container for keeping freshness obtained by
To poly (meth) acrylic acid or poly (meth) acrylic
The trehalose containing no partially neutralized acid is used in the resin set.
The product contains 0.1 to 50% by weight and has a thickness of 3 to 20.
Providing a container for keeping freshness, which is characterized by being 00 μm
To do.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The trehalose used in the present invention is a non-reducing saccharide in which two glucose molecules are bound by α, α-1, 1 and is used as a mushroom, baker's yeast, seaweed,
It is contained in plants such as shrimp and microorganisms and is widely present in nature. The trehalose is not particularly limited, but high-purity hydrous crystalline trehalose is preferable. High-purity hydrous crystalline trehalose is produced by two functions: an enzyme that converts the reducing end of starch to non-reducing and an enzyme that further releases the trehalose portion.

The content of trehalose in the resin composition is 0.1 to 50% by weight, preferably 1.0 to 20% by weight. If the blending amount is less than 0.1% by weight, the effect of keeping the freshness of agricultural products and the like for a long period of time becomes weak. Also,
Even if the amount is more than 50% by weight, the freshness-retaining effect is saturated, which is not preferable in terms of cost.

In the present invention, the resin to which trehalose is mixed is polyvinyl chloride, ethylene-acetic acid copolymer, polyethylene (low density polyethylene, high density polyethylene), polypropylene, polystyrene, ABS resin, polyamide, acrylic resin, Examples thereof include polyacetal, polyethylene terephthalate, and polycarbonate.

The resin composition for maintaining freshness of the present invention can be obtained by mixing and preparing trehalose and a resin. As a method of mixing trehalose and resin,
The mixing is not particularly limited, and mixing may be performed using a known general-purpose mixing machine such as an extruder, a kneader, a Henschel mixer, etc., and a special processing machine as in the past is not required.

The resin composition for keeping freshness according to the present invention,
In addition to the trehalose, if necessary, pigments, colorants such as dyes, dispersants, ultraviolet absorbers, antioxidants, plasticizers, tackiness modifiers, tackiness improvers, antistatic agents, antibacterial agents, sterilizers. Agents, inorganic fillers, etc. can be added. The blending amount of these is not particularly limited, but is preferably 0.05 to 10% by weight in the resin composition.

The form of the resin composition for maintaining freshness of the present invention is not particularly limited, and it may be injection molded products, pipe molded products, blow molded products, foam molded products, pellet molded products, lump or granular molded products, or fibrous products. Molded products, blown film,
Examples include film molded products such as T-die films. In addition, these molded products may be melted again at a construction site or the like to be a packaging material or a container having an arbitrary shape such as a film shape, a sheet shape, a box shape, and a bottomed cylinder shape.

The method of molding the film or sheet is not particularly limited, but known methods such as inflation molding and extrusion molding may be applied.
For example, biaxial stretching can be performed simultaneously with molding or sequentially. Further, a film or sheet suitable for printing or laminating can be obtained by subjecting the film to corona treatment or flame treatment. The thickness of the film or sheet is usually preferably about 3 to 2000 μm, and if it is too thin, it may be damaged during packaging of agricultural products and cut flowers. Further, if it is too thick, the handling property is deteriorated, and packaging of agricultural products and cut flowers becomes difficult. Further, the film or sheet may be subjected to a porous treatment.

The freshness-retaining resin composition of the present invention is used in the form described above, and agricultural products and the like are stored and stored by being wrapped in a sheet or stored in a container. The agricultural products and the like are not particularly limited as long as they are required to maintain freshness, and vegetables, fruits, seafood, meats, processed foods, confectionery,
For example, cut flowers.

[0016]

EXAMPLES Next, the present invention will be described in more detail with reference to examples, but these are merely examples and do not limit the present invention.

Example 1 High-purity hydrous crystalline trehalose (5 parts by weight), magnesium stearate (1 part by weight) and low-density polyethylene (LDP)
E) (Suntech F2270; manufactured by Asahi Kasei Corp.) 94 parts by weight of the mixture was pelletized with a 45 mm twin-screw extruder and molded with an inflation extruder to produce a cylindrical film having a thickness of 60 μm. One apple, which was divided into four, was put into this cylindrical film, and both ends were heat-sealed. This was stored in a refrigerator at 5 ° C., and the time required for it to turn brown was examined. As a result, it took 50 hours for the apple to turn brown.

Comparative Example 1 Low-density polyethylene (LDPE) without high-purity hydrous crystalline trehalose and magnesium stearate
Example 1 was repeated except that only (Suntech F2270; manufactured by Asahi Kasei Co., Ltd.) was used. As a result, the apple in the cylindrical film turned brown in 2 hours.

Example 2 A rose having a cut end wrapped with a water-containing paper was wrapped with the cylindrical film obtained in Example 1. It was stored at room temperature of 22 ° C. and the time until wilting was examined. As a result, it took six days for the rose to wither.

Comparative Example 2 The procedure of Example 2 was repeated, except that the cylindrical film obtained in Comparative Example 1 was used. As a result, the rose wilted in two days.

Example 3 Burdock with peeled skin was put in the cylindrical film obtained in Example 1, and both ends were heat-sealed. In the refrigerator,
It was stored at 5 ° C. and the time to turn brown was examined. As a result, it took 30 hours for the burdock to turn brown.

Comparative Example 3 The procedure of Example 3 was repeated except that the cylindrical film obtained in Comparative Example 1 was used. As a result, the burdock in the cylindrical film turned brown in 3 hours.

[0023]

The resin composition for maintaining freshness of the present invention does not require a special processing machine and can be manufactured at low cost. In addition, there is no fear of irritating odor during processing and it has excellent stability.
The freshness of crops such as vegetables and fruits and cut flowers can be maintained for a long period of time.

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Claims (2)

(57) [Claims] 1. Polyvinyl chloride and ethylene-acetic acid copolymerization
Body, polyethylene, polypropylene, polystyrene, A
BS resin, polyamide, polyacetal, polyethylene
Selected from the group consisting of terephthalate and polycarbonate
Mix the resin and the trehalose to form a resin composition.
A freshness-retaining flap prepared by molding the resin composition.
And a poly (meta) actuate in the resin composition.
Contains partially neutralized poly (meth) acrylic acid
Without the said resin composition in said trehalose, 0.1 to 50
A freshness-retaining film , characterized in that it contains 3% by weight and has a thickness of 3 to 2000 μm . 2. Polyvinyl chloride and ethylene-acetic acid copolymerization
Body, polyethylene, polypropylene, polystyrene, A
BS resin, polyamide, polyacetal, polyethylene
Selected from the group consisting of terephthalate and polycarbonate
Mix the resin and the trehalose to form a resin composition.
A freshness-retaining volume obtained by molding and molding the resin composition.
And a poly (meth) acrylic in the resin composition.
Acid or partially neutralized poly (meth) acrylic acid
The trehalose in the resin composition in an amount of 0.1 to 50
% Content and the thickness is 3 to 2000 μm.
Container for keeping freshness.