JPH0515305A - Method for retaining freshness of unripe ume and gusset bag for retaining freshness - Google Patents

Abstract

PURPOSE:To remarkably prolong the period of retaining freshness of unripe UME (plumb) by sealing the unripe UME and an ethylene remover in a specific pouch, hermetically sealing the pouch and preserving the unripe UME in the pouch at ordinary temperature. CONSTITUTION:For example, a folded part 1 of gusset bag composed of the folded part 1 and a drum part 2 is constructed from a sheet prepared by laminating polymethylpentene on a nonwoven fabric heat-sealable at a low temperature to provide a gusset bag having 10000-100000co/24hr.atm oxygen permeability per pouch at 23 deg.C. Unripe UME in an amount of 10kg and an ethylene remover are sealed in the pouch, hermetically sealed and preserved at ordinary temperature to retain the objective freshness.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for maintaining freshness of blue plum and a gusset bag for maintaining freshness.

[0002]

2. Description of the Related Art Aoume has a rapid deterioration in its freshness after harvesting, and at a temperature of 20 to 25 ° C. around June when it is shipped, it rapidly becomes yellow in 3 to 4 days after harvesting and its commercial value is reduced. . For this reason, especially in the case of transportation to a remote place, it is necessary to devise a method of suppressing yellowing in order to maintain the commercial property.

It is known that conventional techniques for maintaining the freshness of green plum include the use of low temperature and the removal of generated ethylene gas, whereby the yellowing is suppressed. Alternatively, it is also known that the freshness-keeping period is extended by so-called MA storage, which keeps the inside of the package at a low oxygen concentration and a high carbon dioxide concentration by utilizing the breathing action of the film-sealed package and blue plum.

However, the method currently used is
Most of the normal circulation is in a cardboard box containing 10 kg of blue plum, and some of them are only used for MA storage with polyethylene, ethylene / vinyl acetate copolymer, polybutadiene film, or the like. Further, these films are often used as inner bags in corrugated cardboard boxes at the distribution stage from the production area to the market, and are used in a sealed or folded form to obtain the MA effect. In recent years, in consideration of shelf-holding in retail stores such as supermarkets, it is often sold in small quantities at the place of production and packaged in small quantities before being sold to consumers. In this case, appropriate oxygen permeation is required to obtain the MA effect. It has been put to practical use in Chinese chive packaging, etc., after it has been sealed in a small amount with a certain film.

[0005]

Of the above-mentioned conventional techniques,
The use of low temperature is most effective for keeping the freshness of green plum, but it has a drawback that the cost for low temperature distribution is too high. Further, there is a problem that the effect of removing the generated ethylene gas may or may not be effective depending on the composition of the environmental gas, that is, the oxygen concentration and carbon dioxide concentration of the atmosphere. Furthermore, in the case of MA storage using a film, it is very difficult to control the gas concentration in the packaging bag because the oxygen concentration and carbon dioxide concentration in the system depend on the respiratory action of agricultural products and the gas permeability of the film. There is a problem, and in the case of Aume, the oxygen concentration in the packaging bag is 0.1.
When it is less than 0.2%, it causes respiratory disorder and brown disorder.

At present, the most retail form at the consumption stage is about 1 kg, and according to experiments by the present inventors, in this case, 2 kg is used.
Oxygen permeability per pouch at 3 ℃ is 1,800-2,5
By sealing and packing with a pouch of about 00cc / 24hr.atm and using an ethylene remover together, it is possible to maintain freshness for about 7 days at room temperature. Examples of the film forming such a pouch include a polyethylene film, an ethylene / vinyl acetate copolymer film, a polybutadiene film and the like. By controlling the thickness of these films, the oxygen permeability per pouch at 23 ° C. is 1,800. ~
2,500cc / 24hr.atm was obtained, and it was possible to obtain the optimum oxygen and carbon dioxide concentration conditions for blue plum.

However, at present, the form of shipping from the production area is usually carried at room temperature in a 10 kg cardboard box, and when the above-mentioned film is used for the same sealed packaging, the respiration rate of blue plums is large. As a result, the oxygen concentration in the packaging bag is reduced to 0.2% or less, causing respiratory disorders and causing brown disorders. According to the experiments conducted by the present inventors, when the 10 kg film of blue plum is sealed at room temperature, the oxygen permeability per pouch at 23 ° C. of the pouch used is 10,000 to 10
0,000cc / 24hr ・ atm is required. It is possible to improve the oxygen permeability per pouch by decreasing the film thickness or increasing the area by increasing the pouch size, but obtain a film strength that can withstand a blue plum weight of 10 kg. In order to achieve this, a film thickness of at least 20 .mu.m is required, and it is impossible to obtain oxygen permeability per pouch at 23.degree. C. of 10,000 to 100,000 cc / 24 hr.atm with the conventional film. In addition, when the pouch size is increased, an extra space other than blue plum becomes large, which is inconvenient to handle and disadvantageous in the cost of the pouch. For this reason, M is provided by sealing the film during shipping and distribution.
A storage has become very difficult.

Further, most of the conventional bags are flat pouches, and there is a drawback in that the workability of mounting the pouch is very poor particularly when the pouch is used as an inner bag of corrugated cardboard in a production area. The present invention solves the above-mentioned problems of the prior art,
It is an object of the present invention to provide a most effective method for maintaining freshness of blue plum and a gusset bag for maintaining freshness used for the method.

[0009]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventors have found that the oxygen permeability per pouch at 23 ° C. is 10,000 to 100,000 cc / 24 hr · atm.
By packing blue pomegranate in a pouch that is sealed with an ethylene removing agent and storing it, MA storage and ethylene removing effects can be achieved at room temperature at the same time, and the freshness preservation period of blue peas can be significantly extended compared to the conventional method. It was found that the present invention has been completed.

That is, according to the present invention, (1) blue pomegranate is packaged in a pouch whose oxygen permeability at 23 ° C. is 10,000 to 100,000 cc / 24 hr · atm per pouch, and an ethylene removing agent is enclosed and sealed at room temperature. A method of maintaining freshness of blue prunus characterized by storing, (2) the whole or part of the pouch,
The method for maintaining freshness of blue ume according to (1), which is formed of a sheet in which a thermoplastic resin is laminated on a nonwoven fabric that can be heat-sealed at a low temperature, (3) the thermoplastic resin is polymethylpentene (1). Alternatively, the method for maintaining the freshness of blue plum according to (2),
(4) The ethylene removing agent is a carbonaceous molecular sieve having 4 to 6Å micropores adsorbing bromine (1), (2) or
(3) A method for keeping freshness of blue plums, (5) A method for keeping freshness of blue plums described in (1), (2), (3) or (4) above, wherein the packed blue plums are 10 kg. Use as a summary. (6) In a gusset bag composed of a folding part (1) and a body part (2), the folding part (1) is made of a low-salt, heat-sealable non-woven fabric laminated with polymethylpentene.
Oxygen permeability per pouch at ℃ 10,000 ~ 100,000
The essence is a gusset bag for keeping freshness of blue plums, which is characterized by cc / 24hr · atm.

[0011]

The structure and operation of the present invention will be described. The pouch used in the present invention may be a pouch having an oxygen permeability per 23 at 23 ° C. of 10,000 to 100,000 cc / 24 hr · atm, and as such a pouch, the whole or a part of the pouch has a low temperature. A pouch that is a film obtained by laminating polymethylpentene on a non-woven fabric that can be heat-sealed can be used.

Polymethylpentene is a kind of stereoregular polyolefin and is a polymer having 4-methylpentene-1 as a monomer. Oxygen permeability is the highest among olefinic thermoplastic resins, and by controlling the thickness of lamination, it is possible to obtain the oxygen permeability at 23 ° C. of 15,000 cc / m ² · 24 hr · atm or more required for the present invention. It is possible. However, the polymethylpentene film alone has no heat-sealing property and is difficult to use in a pouch form, but it can be used in a pouch form by laminating it with a nonwoven fabric that can be heat-sealed at a low temperature. in this case,
Since the inner surface of the pouch can be heat-sealed at low temperature and the outer surface is polymethylpentene, it can be bonded with normal heat sealing without using impulse sealing,
Continuous production using a gusset bag making machine is possible.

Lamination of polymethylpentene on a non-woven fabric can be achieved by extruding polymethylpentene onto the non-woven fabric using the T-die method which is a conventionally known method, and the adhesive force is a physical property with the non-woven fabric. It occurs only by entanglement, and sufficient adhesive strength can be obtained by this alone, but corona treatment and ozone treatment can be used in combination if necessary.

Further, since the pouch used in the present invention exerts its effect in a sealed state, a non-woven fabric having a heat-sealing property at a low temperature is required on the inner surface. As such a non-woven fabric, polyethylene fiber or A non-woven fabric made of polypropylene fiber, a polyester / polyethylene fiber having a core-sheath structure, a nylon / polyethylene fiber, a polypropylene / polyethylene fiber, a polyester / polypropylene fiber, a nylon / polypropylene fiber, or the like is preferable, and for example, an olefin of Unitika Ltd. Elves (registered trademark), which is a spunbonded non-woven fabric, or Syntex (registered trademark), which is an olefinic spunbonded non-woven fabric manufactured by Mitsui Petrochemical Co., can be used.

In the present invention, in order for the effect of MA storage to be exhibited, the oxygen concentration in the pouch is 0.3% or more and 5% or more.
The oxygen permeability at 23 ° C per pouch required for this is 10,000 to 100,000cc.
/ 24hr ・ atm, more preferably 20,000-50,000cc
It is desirable that it is within the range of / 24hr ・ atm. If the oxygen permeability per pouch at 23 ° C. is less than 10,000 cc / 24 hr · atm, the oxygen concentration in the pouch will be 0.2% or less, and brown odor and offensive odor will occur in blue pomegranate. Also, 100,000cc / 24h
At oxygen permeabilities of r · atm or higher, the effect of MA storage is not observed, and the progress of yellowing cannot be suppressed. The oxygen permeability per pouch can be controlled by changing the thickness of the polymethylpentene to be laminated, but it can also be controlled by changing the area of the packaging material part in which the polymethylpentene is laminated on the nonwoven fabric. For example, by using a packaging material in which a thermoplastic resin such as polyethylene / polypropylene is laminated on one side and polymethylpentene is laminated on a non-woven fabric on one side, the oxygen permeability per pouch can be freely changed. It is possible to obtain an oxygen permeability of 10,000 to 100,000cc / 24hr · atm. Further, by adopting such a form, there is a double effect that the disadvantage that the contents cannot be seen is eliminated.

A particularly preferred freshness-keeping gusset bag is a gusset bag composed of a folded portion and a body portion 2 as shown in FIG. The folding part 1 is made of a sheet in which polymethylpentene is laminated on a non-woven fabric that can be heat-sealed at a low temperature.
The thickness of polymethylpentene to be laminated can be controlled. In the gusset bag of the present invention, the oxygen permeability of the pouch is dramatically larger than that of the body, so the oxygen permeability of the entire pouch is determined by the area of the folded part and the thickness of the polymethylpentene laminated on the folded part. It

Any ordinary thermoplastic resin can be used for the body portion 2, but in consideration of the fact that it can be continuously produced on a gusset bag making machine, it is desirable to use a film capable of continuous ordinary heat sealing, Examples of such a film include nylon / polyethylene, polyester / unstretched polypropylene, stretched polypropylene / unstretched polypropylene and the like, and a multilayer film composed of a substrate / sealant is preferable.

As a result, normal heat sealing can be performed on the gusset bag making machine, continuous production is possible, and the productivity is improved. In addition, since the oxygen permeability of the body 2 is much smaller than that of the folded portion 1, the composition / thickness of the base material / sealant of the body 2 has almost no effect on the oxygen permeability of the entire pouch, and the material of the body 2 is small. Is not limited in terms of oxygen permeability. The gusset bag of the present invention also has the following effects. That is, when trying to achieve the same oxygen permeability as the present invention with a normal flat pouch,
One side of the pouch is a normal thermoplastic resin and is transparent, but the other side is opaque with a packaging material in which a non-woven fabric is laminated with polymethylpentene, which has a drawback that the contents as a whole are difficult to see. However, in the present invention, the opaque portion is limited to only the portion of the folded portion 1, so that the effect that the contents are easy to see can be obtained.

In the present invention, the MA in a film hermetic packaging is used.
In addition to the effect of storage, addition of an ethylene gas removing agent can further enhance the freshness-maintaining effect of blue plum. As a result, ethylene gas, which is a aging-promoting hormone for fruits, is sequentially removed and does not accumulate in the pouch. As a result, it is possible to greatly reduce the brown damage of blue plum and the damage occurring after opening.

As the ethylene gas removing agent, activated carbon, zeolite, a mixture of potassium permanganate with a porous material such as zeolite, sodium bromate or potassium bromate is dissolved, and acidic water is added to the activated carbon to react. After drying, a small bag type ethylene remover such as a bromine-adsorbed carbon molecular sieve with 4 to 6Å micropores can be used, but bromine is adsorbed due to the ethylene removal rate and safety in use. It is desirable to use a pouched carbon branched sieve having 4 to 6Å micropores. Further, the amount of the ethylene remover used can be arbitrarily adjusted according to the amount of blue plum to be stored and is not particularly limited.

[0021]

EXAMPLES Next, the present invention will be described more specifically with reference to Examples and Comparative Examples.

[0022]

Example 1 (1) Polymethylpentene (MX-021 manufactured by Mitsui Petrochemical Co., Ltd.) was applied onto a non-woven fabric (Unitika Elves (registered trademark) S0303WDO 30 g / m ² ) at a thickness of 40 μm using a conventionally known T-die method. Extrusion gave a laminated film of the present invention. (2) A linear low-density polyethylene (Moretec 0238N manufactured by Idemitsu Petrochemical Co., Ltd.) was formed by an inflation method to obtain a film having a thickness of 30 μm. (3) A gusset pouch of 400 × 700 mm was prepared using the film of (1) on one side and the film of (2) on one side to obtain a pouch of the present invention ((1) partial area 0.77 m ² , (2 ) Partial area
0.28m ² , total pouch area 1.05m ² ). (4) 10kg of blue ume and a pouch-type ethylene remover (20g of bromine-adsorbed activated carbon manufactured by Takeda Pharmaceutical Co., Ltd.) in this pouch
Enclose them together and seal the opening with a rubber band stopper.
Stored for days. Comparative Example 1 10 kg of blue plum was enclosed in the same pouch as in Example 1, the opening was sealed with a rubber band stopper, and stored at 23 ° C. for 5 days.

Comparative Example 2 (1) A linear low-density polyethylene (more-tech 0238N manufactured by Idemitsu Petrochemical) was formed by an inflation method to obtain a film having a thickness of 30 μm. (2) A gusset pouch of 400 × 700 mm was prepared from the film on both sides (1). (3) 10kg of blue pomegranate and a pouch-type ethylene remover (20g of bromine-adsorbed activated carbon manufactured by Takeda Pharmaceutical Co., Ltd.) in this pouch.
Enclose them together and seal the opening with a rubber band stopper.
Stored for days. Comparative Example 3 10 kg of blue plum was placed in a cardboard box and kept at 23 ° C without packaging.
Stored for 5 days.

Test Example 1 Table 1 shows the results of measuring the oxygen permeability per pouch of the pouches of Example 1 and Comparative Example 2. As is clear from this result, the pouch of Example 1 has a higher oxygen permeability than that of Comparative Example 2.

[0025]

[Table 1]

Test Example 2 For Example 1 and Comparative Example, Table 2 shows the results of measuring the internal gas composition for 3 days and 5 days, and Table 3 shows the results of the appearance inspection on the 5th day. As is clear from Tables 2 and 3, in Example 1, the oxygen concentration in the pouch can be kept in the optimum range of 0.3 to 5%, and at the same time, the ethylene gas concentration in the pouch was suppressed to a low level. It is effective in keeping the green color of plums and preventing odor. In addition, there is no softening or damage after opening.

[0027]

[Table 2]

[0028]

[Table 3]

[0029]

[Example 2] Polymethylpentene (MX-02 manufactured by Mitsui Petrochemical Industry Co., Ltd.) was used by a conventionally known T-die method.
1) Nonwoven fabric (Unitika Elves S0303WDO
It was extruded with a thickness of 40 μm onto 30 g / m ² ) to obtain a laminated film used for the folding part of the present invention. Next, a conventionally known T-die method was used to obtain a laminated film having the following specifications for use in the body of the present invention.

Nylon 15μ A gusset bag was formed using the above two kinds of laminated films to obtain a fresh gusset for keeping freshness of blue plum of the present invention having a fold width of 270 mm, a body width of 400 × flow of 600 mm (fold). Area area 0.32 m ² , body area
0.48m ² , total pouch area 0.80m ² ).

[0031]

[Comparative Example 4] Using polyethylene having a thickness of 30 µ (Mirason 16P manufactured by Mitsui Petrochemical Industry Co., Ltd.), gusset bag making was carried out in the same manner as in Example 2, and a gusset having a fold width of 270 mm and a width of 400 x 600 mm was sized. I got a bag.

[0032]

[Test Example 3] Table 4 shows the results of measuring the oxygen permeability per pouch at 23 ° C for the gusset bags of Example 2 and Comparative Example 4 described above. As is clear from this result,
The gusset bag of the present invention has a higher oxygen permeability than Comparative Example 4.

[0033]

[Table 4]

[0034]

[Test Example 4] Using the gusset bag of Example and Comparative Capture Example, 10 kg of blue plum was hermetically sealed and stored at 22 ° C. for 3 days, and then the internal gas composition and quality change were examined. In addition, as a control, the sample was stored in an unpackaged state at 22 ° C. for 3 days, and the results of Example 2,
The freshness preservation effect was compared with Comparative Example 4. The results are shown in Tables 5 and 6.

As is clear from Tables 5 and 6, it is possible to maintain the optimum internal gas composition in the pouch by using the blue ume freshness-maintaining gusset bag of the present invention. It is effective in preventing offensive odors.

[0036]

[Table 5]

[0037]

[Table 6]

[0038]

EFFECTS OF THE INVENTION Since the present invention is constructed as described above, the oxygen permeability per pouch at 23 ° C. is 1
Aume is hermetically packaged in a pouch that is 0,000 to 100,000cc / 24hr ・ atm, and an ethylene scavenger is enclosed and stored to maintain low oxygen and low carbon dioxide concentrations in the packaging bag, and at the same time it is generated from fruits. The ethylene gas is removed, and the conventional 3 ~
It is possible to significantly extend the freshness retention period of blue plum, which had been yellowed and lost its commerciality in 4 days, which is extremely useful in industry.

[Brief description of drawings]

FIG. 1 shows a perspective view of a freshness-keeping gusset bag of blue plum of the present invention.

[Explanation of symbols]

1 ... folding part, 2 ... body part

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location B65D 81/24 D 7191-3E 81/26 G 7191-3E // B32B 27/12 7258-4F 8921 -3E B65D 85/00 Z 8921-3E 85/50 Z

Claims (6)

[Claims] 1. The oxygen permeability at 23 ° C. is 1 per pouch.
A method for maintaining freshness of blue plums, which comprises pouches of 0,000 to 100,000cc / 24hr · atm and packaging the blue pomegranate, enclosing and sealing the ethylene remover and storing at room temperature. 2. The method for maintaining freshness of blue pomegranate according to claim 1, wherein the whole or a part of the pouch is formed of a sheet obtained by laminating a thermoplastic resin on a nonwoven fabric which can be heat-sealed at a low temperature. 3. The method for maintaining freshness of blue plum according to claim 1, wherein the thermoplastic resin is polymethylpentene. 4. An ethylene scavenger containing 4-to which bromine is adsorbed.
A carbonaceous molecular sieve having 6Å micropores,
The method for maintaining freshness of blue plum according to 2 or 3. 5. The method for maintaining freshness of blue ume according to claim 1, 2, 3 or 4, wherein the packed blue ume is 10 kg. 6. A gusset bag composed of a folding part (1) and a body part (2), wherein the folding part (1) is made of a low-salt, heat-sealable non-woven fabric laminated with polymethylpentene. Oxygen permeability per pouch at 23 ° C is 10,000 to 100,000 cc / 24hr · atm, which is a gut bag for maintaining freshness of blue plum.