JPS63110186A - Freshness holding film for vegetable and fruit - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a freshness-keeping film for fruits and vegetables.

[Conventional technology]

One way to suppress the decline in freshness of fruits and vegetables is to remove ethylene generated from fruits and vegetables.
It is known that activated carbon with oxidizing ability is effective as an ethylene decomposition adsorbent (Tokukosho!7-39/ll
'? , Special Public Show 1t-2huts). The method of use is to package activated carbon, which has oxidizing ability, in small bags with air-permeable packaging material, and enclose it as a freshness-preserving agent when packaging fruits and vegetables.

[Problem that the invention seeks to solve]

In the above-mentioned conventional usage method, when packaging fruits and vegetables, two containers are used together, which causes problems such as poor workability, time-consuming work, and the problem of forgetting to put in the container.

Furthermore, if the breathable packaging material is torn, there is a risk that the fruits and vegetables will come into direct contact with the activated carbon, which has oxidizing ability, and damage the fruits or vegetables, or that they will be eaten together with the fruits and vegetables.

Therefore, the problem to be solved by the present invention is to solve the above-mentioned drawbacks by converting the conventional freshness-preserving agent into a film, and to provide a freshness-preserving agent with a mouth structure that will not damage fruits and vegetables even if it comes into direct contact with the agent. It is in.

[Means for solving problems]

The present invention solves the above-mentioned problems, and its gist is "a freshness film for fruits and vegetables containing activated carbon dispersed in a thermoplastic synthetic resin having the ability to decompose and adsorb ethylene."

In the present invention, powdered activated carbon (to which chlorine, bromine, iodine, etc. have been added) can be used as the activated carbon that has the ability to decompose and adsorb ethylene; The most suitable one is

In addition, activation methods include: - Contacting activated carbon with a carrier gas containing bromine gas, - Immersing activated carbon in bromine water, - Spraying liquid bromine directly onto the activated carbon, and - Combining activated carbon with bromate. A method of reaction treatment with sulfuric acid water, etc. can be used.

As the thermoplastic synthetic resin, any thermoplastic synthetic resin can be used as long as it can be used for packaging fruits and vegetables, such as polyethylene, polypropylene, and polyvinyl chloride.

In a thermoplastic synthetic resin such as activated carbon that has the ability to decompose and adsorb ethylene (bidispersion, inclusion, and film formation are conventional methods of mixing with synthetic resin in a melted state by heating using a Pampari type mixer or roller type mixer. The law kneading method can be used, and T is also used as a film production method.
Conventional methods such as the die method, inflation method, and calendar method can be used.

In addition, in order to impart strength and other functions to the film, it can be multi-layered by dual co-extrusion or lamination with other films.

The freshness preservation film of the present invention can be used as it is to form a packaging bag,
Alternatively, the freshness-preserving film of the present invention is pasted with a cardboard liner by a conventional method, and then a corrugator (a double-twisted cardboard is made, and then it is formed into a box shape). To obtain a cardboard box with a freshness-preserving function, which can be used for freshness-preserving packaging by putting fruits and vegetables inside the box.

〔Example〕

Example Activated carbon (0.1M aqueous sulfuric acid solution containing 2/0% potassium bromate) was added, mixed, and reacted for a few hours.

Thereafter, the mixture was dried by overheating to obtain activated carbon having oxidizing ability.

Activated carbon with this oxidizing ability is added to low-density polyethylene.
A film with a density of (W) aOμ was obtained.

Comparative Example: Activated carbon was kneaded into low density polyethylene (inflated resin method 1 by two conventional methods; lIO at a concentration of 3% (v/w)
A film of μ was obtained.

The following experiments were conducted using the films of the above Examples and Comparative Examples.

(Experiment 1) 2 itj each of the above film and a 4tθμ low density polyethylene film! :/ Kojd Bayerbin (Two people, sealed with a rubber stopper and an aluminum cap.

A fixed amount of ethylene was injected using a gastight syringe, and after two hours, the ethylene concentration was measured using gas chromatography.

Table-7 Decomposition/adsorption rate (experimental) ■Vertical than the above film! A patch of r00m x 3oo horizontally was created.

■A cardboard box with outer dimensions 32□cm x width Yuku Om x height/, 3-0 A-/type (all flaps are the same length, outer flaps are butt-cut type) and the film of the example is pasted on the inside. (K liner, 2.20g/g, A flute) was created.

■Activated carbon with oxidizing ability! A freshness preserving agent was prepared by packing I into a paper bag.

These patches demonstrate the freshness preservation effect of cardboard boxes.
This was confirmed by packaging and storing kp at room temperature for a week.

Storage test results〉 1 Example Batch Retains green color for more than 7 days Comparative example batch Turns yellow in 3 days C Made of low-density polyethylene film Batch turns yellow in 3 days D Made of low-density polyethylene film Edge color remains for more than 7 days Preservation patch + freshness preservation agent/Example cardboard box Retains edge color for more than 7 days f
A two-color cardboard box without a film inside. Yellow after 3 days; a two-color cardboard box without a film inside. Retains edge color for more than 7 days. Cardboard box + freshness preservation agent [Effects of the invention] As detailed above, this book According to the invention, since the conventional freshness preserving agent is made into a film, it is possible to eliminate the poor workability of fruits and vegetables and forgetting to add the freshness preserving agent, and the activated carbon is dispersed in thermoplastic synthetic resin and Therefore, it has the advantage that it does not directly contact the fruits and vegetables and damage them.

Claims (2)

[Claims] (1) A freshness-preserving film for fruits and vegetables containing activated carbon that has the ability to decompose and adsorb ethylene dispersed in a thermoplastic synthetic resin. (2) The freshness-keeping film for fruits and vegetables according to claim 1, wherein the activated carbon having the ability to decompose and adsorb ethylene is brominated activated carbon.