JP2005073529A - Package material for loquat, package bag for loquat and loquat package body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide package material for a loquat and a packaging bag for a loquat each excellent in freshness-keeping effect for maintaining both of external freshness having no wither, rot, discoloration or the like, and deliciousness. <P>SOLUTION: The package material satisfies the following: the steam penetration ratio of the package material is 50-850 g/m<SP>2</SP>×24h×atm (at 40°C×90%RH); an oxygen concentration in the loquat package body where the loquat is packaged using the package material is 15.5-19.6 wt.%; and the CO<SB>2</SB>concentration of the package material is 0.5-7 wt.%; and the oxygen transmission rate of the package material based on 100 g of the loquat is 2,000-7,000cc/24h ×atm. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a packaging material, a packaging bag, and a loquat package used for loquat packaging.

Loquat deteriorates rapidly after harvesting. Factors that reduce loquat quality include wilting, rot, mold, and poor taste. Since loquat cannot be ripened, it is often shipped at near ripeness and transported at room temperature, and is usually distributed and sold in a form in which a film is placed on a food pack or tray (open system). In such a package, loquat tends to wither, and the taste is remarkably lowered. It is extremely difficult for consumers to obtain loquat in a delicious and fresh state immediately after harvesting. Moreover, because the main production areas are far from large consumption areas such as Nagasaki, Kagoshima, and Saga, it is expected to extend the shelf life.
In recent years, freshness-keeping materials for fruits and vegetables having an MA (Modified Atmosphere) effect have been developed and are mainly used for distribution. Fruits and vegetables continue to breathe even after harvest, and in an environment where the oxygen concentration is lower than the atmosphere (approximately 21% oxygen, approximately 0.04% carbon dioxide) and the carbon dioxide concentration is high, respiration is suppressed and freshness is maintained. In the MA packaging, fruits and vegetables are sealed and packaged, and the packaging body is brought into a low oxygen and high carbon dioxide state by the balance between the respiration rate of the fruits and vegetables and the gas permeation rate of the packaging.
However, when wrapping loquat with a polypropylene film or polyethylene film that is generally used as a packaging material for fruits and vegetables, there is a problem in that dew formation tends to cause mold and rot.

In Patent Document 1, loquat is hermetically sealed with a nylon single layer film having a water vapor transmission rate of 30 to 200 g / m ² · 24 h · atm (at 40 ° C. and 90% RH), and the oxygen concentration in the package is 6 to 15 % And a weight loss of 0.3 to 1.0% per day, it is described that the dew condensation in the package can be prevented and the freshness of loquat can be maintained. Although the appearance of loquat, such as prevention of wilting under conditions, is maintained well, there has been a problem that when the food is stored for 3 days or 4 days, a strange taste is felt when eaten.
JP 2001-004831 A

  The present invention was made in order to maintain both the appearance freshness and deliciousness such as wilting, decay, discoloration, etc., which could not be compatible with conventional packaging, and a loquat packaging material excellent in freshness retention effect, To provide a packaging bag.

The water vapor transmission rate of the packaging material is 50 to 850 g / m ² · 24 h · atm (at 40 ° C. and 90% RH), and the oxygen concentration in the package of the loquat packaged using the packaging material is 15.5 to 19. A loquat packaging material having 6% carbon dioxide concentration of 0.5 to 7%. As a more preferable form, the packaging material is nylon film, polystyrene film, moisture-proof cellophane film, nylon-vinyl acetate copolymer multilayer film containing 5 to 25% by weight of nylon and vinyl acetate, nylon and ethylene vinyl alcohol copolymer. Any one selected from a polymer multilayer film, a polystyrene / vinyl acetate copolymer multilayer film having a polystyrene and vinyl acetate content of 5 to 25% by weight, or a polystyrene / ethylene vinyl alcohol copolymer multilayer film. Yes, the oxygen permeation rate per 100 g of beer of the packaging material is 2000 to 7000 cc / 24 hr · atm, the ratio of carbon dioxide permeation rate / oxygen permeation acceleration is 0.7 to 2, and one opening is provided in the packaging material. The opening area of 7.9 × 10 ^{−5 to} 5 × 10 ⁻² mm ² Or it is a packaging material for loquats which has 1 to 500 at least one kind of unpenetrated scratches or cracks per 100 g of loquat.
Moreover, it is a wrapping bag for loquats that is made into a bag using the packaging material described above. As a more preferable form, the packaging bag material includes the packaging material described above and a film in which polyethylene or ethylene-vinyl acetate copolymer is laminated on paper or polyethylene terephthalate, and the packaging material described above is the entire packaging material. The packaging bag occupies an area of 30% or more of the surface area, and the packaging bag has a zipper-type opening / closing member.
Moreover, it is the loquat package which packaged loquat using the loin packaging bag described above. As a more preferred form, the package in which the loquat is packaged is stored in a temperature range of 0 to 20 ° C, and the temperature range of 20 to 35 ° C is a loquat package in which the temperature range is less than 24 hours.

According to the method of the present invention, when the loquat is packaged and stored, the freshness of appearance such as wilting, decay, and discoloration of the loquat can be maintained for a long time, and the deliciousness of the loquat after storage can be maintained for a long time.
The present invention also enables long-term storage for more than one month.

  In the present invention, the loquat is packaged with a packaging material, the oxygen concentration in the package is 15.5 to 19.6%, and the carbon dioxide concentration is 0.5 to 7%. It has been found that discoloration of can also be prevented. If the oxygen concentration is less than 15.5% or the carbon dioxide concentration exceeds 7%, the discoloration of loquat can be prevented, but a nasty taste occurs, and under extreme low oxygen and high carbon dioxide conditions, breathing disorder (anaerobic) (Breathing) occurs, and there is a problem that nasty smell, decay, etc. are promoted more than usual. On the other hand, when the oxygen concentration exceeds 19.6% or the carbon dioxide concentration is less than 0.5%, the sourness of loquat is lost, the taste becomes lighter, and it is liable to become worse and the discoloration preventing effect is weakened.

Further, in the present invention, the water vapor permeability in the packaging material is 50 to 850 g / m ² · 24 h · atm (at 40 ° C. · 90% RH). It has been found that no condensation occurs on the inner surface of the package and the surface of the wrinkles. By preventing dew condensation, it is possible to prevent decay and mold generated in loquat, making it easy to see the contents, and maintaining a good appearance of the package containing loquat. If the water vapor transmission rate is less than 50g / m ² · 24h · atm (at 40 ° C · 90% RH), moisture will accumulate in the package and condensation will form on the inner surface of the bag and the surface of the loquat, causing rotting of the loquat and growth of mold. On the contrary, if it exceeds 850 g / m ² · 24 h · atm (at 40 ° C. · 90% RH), loquat wrinkles become remarkable and it may be difficult to maintain the quality. As a more preferable range, the water vapor transmission rate is 50 to 200 g / m ² · 24 h · atm (at 40 ° C. · 90% RH). When the storage period is as long as 1 week or more, the water vapor transmission rate is preferably 50 to 200 g / m ² · 24 h · atm (at 40 ° C. · 90% RH).

  The material of the packaging material is not particularly limited. For example, nylon film, polystyrene film, moisture-proof cellophane film, nylon-vinyl acetate copolymer multilayer film having a vinyl acetate content of 5 to 25% by weight, nylon, Either a multilayer film of an ethylene vinyl alcohol copolymer, a multilayer film of an ethylene-vinyl acetate copolymer having a polystyrene and vinyl acetate content of 5 to 25% by weight, or a multilayer film of a polystyrene and ethylene vinyl alcohol copolymer It is.

These may be used independently, but they may be combined with each other, and it is preferable that 30% or more of the total surface area of a packaging bag made by making a packaging material is the packaging material. If the packaging material is 30% or more, it may be combined with a portion other than the packaging material with a polypropylene film, a polyethylene film, polyethylene terephthalate, a multilayer film of nylon and polyethylene, or the like. If the packaging material other than the packaging material occupies 70% or more of the total surface area of the packaging bag, condensation may easily occur in the package when the loquat is packaged.
Also, by using paper or polyethylene terephthalate film laminated with polyethylene or ethylene-vinyl acetate copolymer on one side or part of the packaging material, the appearance of the packaging can be improved and the efficiency of the packaging work can be improved. is there.

  The thickness of the packaging material does not need to be specified in particular, but for example, the thickness is preferably 65 μm or less, more preferably 45 μm or less in consideration of cost. Moreover, in order to maintain the strength of the package so as to be able to withstand loquat packaging (loading during packaging operation or transportation), the thickness of the packaging material is preferably 15 μm or more, for example.

  Although the water vapor transmission rate per 100 g of loquat is not particularly limited, for example, it is preferably within a range of 0.7 to 25 g / 100 g · 24 hr · atm (at 40 ° C. · 90% RH). By setting it within this range, weight loss and wilting can be prevented as compared with an unwrapped product stored under the same conditions, and no condensation occurs in the package. If the water vapor transmission rate per 100g of loquat is less than 0.7g / 100g · 24hr · atm, the water released from loquat will accumulate in the package and microorganisms will easily propagate. There is a possibility. On the other hand, if it exceeds 25 g / 100 g · 24 hr · atm, loquat may be easily deflated.

  Although the weight reduction during the storage period of the loquat put in the packaging bag is not particularly limited, for example, it is preferably less than 6%, and more preferably less than 5%. If the weight reduction is suppressed too much and the amount is less than 0.05% per day, dew condensation occurs in the package. Conversely, if the weight reduction is too large, loquat tends to wrinkle and it is difficult to maintain freshness. Humidity at the time of storage greatly affects, but the upper limit of weight reduction is preferably as small as possible within the range where condensation does not occur, and it is 1% or less per day at 20 to 35 ° C and 0.5% or less at 0 to 20 ° C. It is preferable in terms of maintaining freshness.

Further, the film may be stretched or unstretched, and may be printed or antifogged. The antifogging agent to be used is preferably a good antifogging property at a low temperature. Specifically, it is preferable that the fatty acid contains a fatty acid which is a saturated fatty acid having 8 to 12 carbon atoms or an unsaturated fatty acid having 16 to 20 carbon atoms and a polyhydric alcohol ester surfactant. For example, sorbitan monolaurate, diglycerin oleate and the like can be mentioned.
When the antifogging agent is kneaded, the film surface may be corona-treated to promptly exhibit the antifogging effect. When the antifogging agent is applied, a slip agent (for example, a product) is used to prevent the film from blocking. Name: Nikkarico) may be applied to the surface.

  Although the oxygen permeation rate per 100 g of loquat of the packaging material is not particularly limited, for example, 2000 to 7000 cc / 24 hr · atm is preferable, and the ratio of carbon dioxide permeation rate / oxygen permeation rate is preferably 0.7 to 2. When the oxygen transmission rate per 100 g of loquat is less than 2000 cc / 24 hr · atm, or when the ratio of carbon dioxide transmission rate / oxygen transmission rate is less than 0.7, the sourness and sweetness of loquat are lost and the taste becomes light, or There is a possibility that a nasty taste will occur and it will be worse. On the contrary, when the oxygen permeation acceleration per 100 g of loquat exceeds 7000 cc / 24 hr · atm, or when the ratio of carbon dioxide permeation rate / oxygen permeation rate exceeds 2, the loquat skin of the loquat may be easily discolored.

When the oxygen permeation amount and carbon dioxide permeation amount of the packaging material are insufficient, an opening or the like may be provided in the packaging material. Although it is not particularly limited, for example, at least one kind of fine hole, penetrating or non-penetrating scratch or crack having an opening area of 7.9 × 10 ^{−5 to} 5 × 10 ⁻² mm ² is 1 per 100 g of loquat. It is preferable to provide ~ 500. The opening area of the micropores is 7.9 × 10 ^{−5 to} 5 × 10 ⁻² mm ^{2, and if} it is less than 7.9 × 10 ⁻⁵ mm ² , processing is difficult and mass production is difficult. In order to avoid intrusion as much as possible, it is desirable to be 5 × 10 ⁻² mm ² or less. Moreover, when there are too many fine holes, scratches or cracks, the workability is deteriorated and the transparency of the package is lowered, which is not preferable.

  A known method can be used as a method for producing a packaging bag using the packaging material of the present invention. The shape of the packaging bag is not particularly limited, but a three-dimensional shape such as a bag having a gusset, a tetrapack, or a self-supporting bag may be used as well as a flat bag. A known method can be used as a method of putting loquat in a packaging bag to obtain a loquat package. In addition, loquat may be placed on a plastic tray or the like and wrapped with the packaging material of the present invention, or the container may be filled with loquat and the container with the packaging material of the present invention.

  In addition, the package of the present invention needs to seal the mouth of the packaging bag containing loquat, but as this method, it may be sealed by heat sealing, and in addition, a zipper, caulking, rubber band, glue There is no problem with any method such as attaching and back sealing. By making it a form that can be resealed such as a zipper, it is possible to keep freshness by reinserting what remains when it cannot be consumed at once at home. Moreover, the same effect can be acquired also in the form which puts a top seal on a container, and the form which puts a tray for every bag and seals.

  The storage temperature of the package is not particularly limited as long as it is shipped in a short-term storage, but a low temperature is preferable. For long-term storage for 8 days or more and then shipping, the storage conditions may be, for example, a temperature range of 20 to 35 ° C. for less than 24 hours, and otherwise a temperature range of 0 to 20 ° C. desirable. This is because when stored at a high temperature such as 20 to 35 ° C. for a long period of time, the wrinkles such as rot and mold are likely to be damaged, and it should be maintained at a low temperature such as 0 to 20 ° C., more preferably 0 to 15 ° C. or less. Therefore, the effect of maintaining the freshness of the package of the present invention is drastically exhibited and long-term storage over several months is possible.

  Examples of the varieties of loquat include, but are not limited to, Mogi, Tanaka, Amakusa early, Nagase early, Nagasaki early, Obo, Satomi, Yukawa, Shirahige, Bokko, and Morimoto.

<Example 1> A packaging bag having an inner dimension of 200 × 250 mm made of a biaxially stretched nylon film having a water vapor permeability of 180 g / m ² · 24 h · atm (at 40 ° C./90% RH) and a thickness of 15 μm and anti-fogging processed. Created. In the bag, 33 holes having an opening area of 3.8 × 10 ⁻³ mm ² were formed so that the oxygen permeation rate per 100 g of loquat was 2900 cc / 100 g · 24 h · atm. About 340 g of loquat (Mogi) was put in this, sealed, and stored at 15 ° C. for 30 days.
<Example 2> A packaging bag having a water vapor transmission rate of 180 g / m ² · 24 h · atm (at 40 ° C · 90% RH) and an anti-fogging processing of 15 µm in thickness and an inner dimension of 200 x 250 mm made of a biaxially stretched nylon film. Created. In the bag, 33 holes having an opening area of 3.8 × 10 ⁻³ mm ² were formed so that the oxygen permeation rate per 100 g of loquat was 2900 cc / 100 g · 24 h · atm. About 340 g of loquat (Tanaka) was put in this, sealed, and stored at 15 ° C. for 30 days.
<Example 3> A bag having an inner size of 200 × 250 mm is formed from a biaxially stretched nylon film having a water vapor permeability of 180 g / m ² · 24 h · atm (at 40 ° C./90% RH) and a thickness of 15 μm and anti-fogging processed. did. In the bag, 33 holes having an opening area of 3.8 × 10 ⁻³ mm ² were formed so that the oxygen permeation rate per 100 g of loquat was 2900 cc / 100 g · 24 h · atm. About 340 g of loquat (Mogi) was put in this, sealed, and stored at 25 ° C. for 5 days.
<Example 4> A bag having an inner dimension of 200 × 250 mm is formed from a biaxially stretched nylon film having a water vapor transmission rate of 180 g / m ² · 24 h · atm (at 40 ° C./90% RH) and a thickness of 15 μm and anti-fogging processed. did. 75 holes with an opening area of 3.8 × 10 ⁻³ mm ² were formed in the bag so that the oxygen permeation rate per 100 g of loquat was 6600 cc / 100 g · 24 h · atm. About 340 g of loquat (Mogi) was put in this, sealed, and stored at 25 ° C. for 5 days.
Example 5 A bag having an inner size of 200 × 250 mm was formed of a moisture-proof cellophane film having a water vapor transmission rate of 710 g / m ² · 24 h · atm (at 40 ° C. · 90% RH) and a thickness of 23 μm. Twenty-seven holes having an opening area of 7.2 × 10 ⁻³ mm ² were formed in the bag so that the oxygen transmission rate per 100 g of loquat was 2900 cc / 100 g · 24 h · atm. About 340 g of loquat (Mogi) was put in this, sealed, and stored at 15 ° C. for 30 days.
Example 6 A bag having an inner size of 200 × 250 mm was formed with a moisture-proof cellophane film having a water vapor transmission rate of 710 g / m ² · 24 h · atm (at 40 ° C. · 90% RH) and a thickness of 23 μm. Twenty-seven holes having an opening area of 7.2 × 10 ⁻³ mm ² were formed in the bag so that the oxygen transmission rate per 100 g of loquat was 2900 cc / 100 g · 24 h · atm. About 340 g of loquat (Tanaka) was put in this, sealed, and stored at 15 ° C. for 30 days.
Example 7 A bag having an inner size of 200 × 250 mm was formed with a moisture-proof cellophane film having a water vapor transmission rate of 710 g / m ² · 24 h · atm (at 40 ° C. · 90% RH) and a thickness of 23 μm. Twenty-seven holes having an opening area of 7.2 × 10 ⁻³ mm ² were formed in the bag so that the oxygen transmission rate per 100 g of loquat was 2900 cc / 100 g · 24 h · atm. About 340 g of loquat (Mogi) was put in this, sealed, and stored at 25 ° C. for 5 days.
<Example 8> A bag having an inner size of 200 x 250 mm was made of a moisture-proof cellophane film having a water vapor transmission rate of 710 g / m ² · 24 h · atm (at 40 ° C · 90% RH) and a thickness of 23 µm. In the bag, 58 holes with an opening area of 7.2 × 10 ⁻³ mm ² were opened so that the oxygen transmission rate per 100 g of loquat was 6300 cc / 100 g · 24 h · atm. About 340 g of loquat (Mogi) was put in this, sealed, and stored at 25 ° C. for 5 days.
<Example 9> One side has a water vapor transmission rate of 120 g / m ² · 24 h · atm (at 40 ° C./90% RH), 35 μm thick biaxially stretched nylon (15 μm), and 15% vinyl acetate content ethylene-acetic acid A bag having an inner size of 200 × 250 mm was made of a multilayer film of a vinyl copolymer (20 μm) and a multilayer film of polyethylene terephthalate (12 μm) and low-density polyethylene (40 μm) having a thickness of 52 μm on the other side. 170 holes with an opening area of 2.0 × 10 ⁻³ mm ² were opened in the bag so that the oxygen permeation rate per 100 g of loquat was 3300 cc / 100 g · 24 h · atm. About 340 g of loquat (Tanaka) was put in this, sealed, and stored at 10 ° C. for 60 days.
<Example 10> One side has a water vapor transmission rate of 120 g / m ² · 24 h · atm (at 40 ° C., 90% RH), a 35 μm thick biaxially stretched nylon (15 μm), and an ethylene-acetic acid content of 15% vinyl acetate. A bag having an inner size of 200 × 250 mm was made of a multilayer film of a vinyl copolymer (20 μm) and a multilayer film of polyethylene terephthalate (12 μm) and low-density polyethylene (40 μm) having a thickness of 52 μm on the other side. In the bag, 347 holes having an opening area of 2.0 × 10 ⁻³ mm ² were opened on the nylon / EVA side so that the oxygen permeation rate per 100 g of loquat was 6700 cc / 100 g · 24 h · atm. About 340 g of loquat (Tanaka) was put in this, sealed, and stored at 30 ° C. for 4 days.
<Example 11> A bag having an inner size of 200 x 250 mm was made of a polystyrene film having a water vapor permeability of 130 g / m ² · 24 h · atm (at 40 ° C · 90% RH) and a thickness of 30 µm. In the bag, 46 holes having an opening area of 3.8 × 10 ⁻³ mm ² were opened so that the oxygen permeation rate per 100 g of loquat was 2200 cc / 100 g · 24 h · atm. About 340 g of loquat (Mogi) was put in this, sealed, and stored at 25 ° C. for 5 days.
<Example 12> One side has a water vapor transmission rate of 120 g / m ² · 24 h · atm (at 40 ° C., 90% RH), a 35 μm thick biaxially stretched nylon (15 μm), and an ethylene-acetic acid content of 15% vinyl acetate. A bag having an inner size of 200 × 250 mm was made of a multilayer film of a vinyl copolymer (20 μm) and a multilayer film of polyethylene terephthalate (12 μm) and low-density polyethylene (40 μm) having a thickness of 52 μm on the other side. In the bag, 341 holes having an opening area of 2.0 × 10 ⁻³ mm ² were opened on the nylon / EVA side so that the oxygen permeation rate per 100 g of loquat was 6600 cc / 100 g · 24 h · atm. About 340 g of loquat (Tanaka) was put in this, sealed, stored at 25 ° C. for 24 hours, and then stored at 15 ° C. for 29 days.
Example 13 A bag having an inner size of 150 × 150 mm was made of a polystyrene film having a vapor permeability of 130 g / m ² · 24 h · atm (at 40 ° C. · 90% RH) and a thickness of 30 μm. Nine holes with an opening area of 3.8 × 10 ⁻³ mm ² were formed in the bag so that the oxygen transmission rate per 100 g of loquat was 2200 cc / 100 g · 24 h · atm. One loquat (mogi), about 72 g, was put in this, sealed, and stored at 25 ° C. for 5 days.
<Example 14> One side has a water vapor transmission rate of 120 g / m ² · 24 h · atm (at 40 ° C./90% RH), a 35 μm thick biaxially stretched nylon (15 μm), and an ethylene-acetic acid content of 15% vinyl acetate. A bag having an inner size of 200 × 250 mm was made of a multilayer film of a vinyl copolymer (20 μm) and a multilayer film of polyethylene terephthalate (12 μm) and low-density polyethylene (40 μm) having a thickness of 52 μm on the other side. The bag was scratched and cracked on the PET / LDPE side so that the oxygen transmission rate per 100 g of loquat was 3100 cc / 100 g · 24 h · atm. About 340 g of loquat (Tanaka) was put in this, sealed, and stored at 15 ° C. for 30 days.

Water vapor transmission rate per 100 g of loquat of Examples 1 to 14 (g / 100 g · 24 h · atm, at 40 ° C., 90% RH), area ratio (%) occupied by the packaging material of the present invention in the packaging bag, per 100 g of loquat Table 1 shows the oxygen permeation rate (cc / 100g · 24h · atm) and carbon dioxide permeation rate / oxygen permeation rate (CO ₂ P / O ₂ P) values. Table 2 shows the weight loss (%).

Comparative Example 1 A bag having an inner size of 200 × 250 mm was made of a biaxially oriented polypropylene film having a water vapor transmission rate of 5 g / m ² · 24 h · atm (at 40 ° C. · 90% RH) and a thickness of 30 μm. In the bag, 55 holes having an opening area of 3.8 × 10 ⁻³ mm ² were formed so that the oxygen permeation rate per 100 g of loquat was 2900 cc / 100 g · 24 h · atm. About 340 g of loquat (Mogi) was put in this, sealed, and stored at 15 ° C. for 30 days.
<Comparative Example 2> A bag with an inner dimension of 200 x 250 mm is made of a biaxially stretched nylon film with a water vapor transmission rate of 180 g / m ² · 24 h · atm (at 40 ° C · 90% RH) and a thickness of 15 µm and anti-fogging. did. About 340 g of loquat (Mogi) was put in this, sealed, and stored at 15 ° C. for 30 days.
<Comparative Example 3> A bag with an inner dimension of 200 × 250 mm is made of a biaxially stretched nylon film having a water vapor permeability of 180 g / m ² · 24 h · atm (at 40 ° C./90% RH) and a thickness of 15 μm and anti-fogging processed. did. Thirteen holes with an opening area of 3.8 × 10 ⁻³ mm ² were formed in the bag so that the oxygen transmission rate per 100 g of loquat was 1100 cc / 100 g · 24 h · atm. About 340 g of loquat (Mogi) was put in this, sealed, and stored at 15 ° C. for 30 days.
<Comparative Example 4> A bag with an inner dimension of 200 x 250 mm is made of a biaxially stretched nylon film having a water vapor transmission rate of 180 g / m ² · 24 h · atm (at 40 ° C · 90% RH) and a thickness of 15 µm and anti-fogging processed. did. In the bag, 100 holes with an opening area of 3.8 × 10 ⁻³ mm ² were opened so that the oxygen transmission rate per 100 g of loquat was 8800 cc / 100 g · 24 h · atm. About 340 g of loquat (Mogi) was put in this, sealed, and stored at 15 ° C. for 30 days.
<Comparative Example 5> About 340 g of loquat (Mogi) was placed in a tray and stored at 15 ° C. for 30 days.
Table 4 shows the gas concentration around loquat, the quality of loquat, and the weight loss (%) per day.
Comparative Example 6 A bag having an inner size of 200 × 250 mm was made of a biaxially oriented polypropylene film having a water vapor transmission rate of 5 g / m ² · 24 h · atm (at 40 ° C. · 90% RH) and a thickness of 30 μm. In the bag, 55 holes having an opening area of 3.8 × 10 ⁻³ mm ² were formed so that the oxygen permeation rate per 100 g of loquat was 2900 cc / 100 g · 24 h · atm. About 340 g of loquat (Tanaka) was put in this, sealed, and stored at 15 ° C. for 30 days.
<Comparative Example 7> A bag having an inner size of 200 × 250 mm is formed of a biaxially stretched nylon film having a water vapor permeability of 180 g / m ² · 24 h · atm (at 40 ° C./90% RH) and a thickness of 15 μm and anti-fogging processed. did. This was filled with 340 g of loquat (Tanaka), sealed, and stored at 15 ° C. for 30 days.
<Comparative Example 8> A bag with an inner size of 200 × 250 mm is made of a biaxially stretched nylon film having a water vapor transmission rate of 180 g / m ² · 24 h · atm (at 40 ° C./90% RH) and a thickness of 15 μm and anti-fogging processed. did. Thirteen holes with an opening area of 3.8 × 10 ⁻³ mm ² were formed in the bag so that the oxygen transmission rate per 100 g of loquat was 1100 cc / 100 g · 24 h · atm. About 340 g of loquat (Tanaka) was put in this, sealed, and stored at 15 ° C. for 30 days.
<Comparative Example 9> A bag having an inner size of 200 × 250 mm is formed from a biaxially stretched nylon film having a water vapor permeability of 180 g / m ² · 24 h · atm (at 40 ° C./90% RH) and a thickness of 15 μm and anti-fogging processed. did. In the bag, 100 holes with an opening area of 3.8 × 10 ⁻³ mm ² were opened so that the oxygen transmission rate per 100 g of loquat was 8800 cc / 100 g · 24 h · atm. About 340 g of loquat (Tanaka) was put in this, sealed, and stored at 15 ° C. for 30 days.
<Comparative Example 10> About 340 g of loquat (Tanaka) was placed in a tray and stored at 15 ° C. for 30 days. Table 4 shows the gas concentration around loquat, the quality of loquat, and the weight loss (%) per day.
Comparative Example 11 A bag having an inner size of 200 × 250 mm was made of a biaxially oriented polypropylene film having a water vapor transmission rate of 5 g / m ² · 24 h · atm (at 40 ° C. · 90% RH) and a thickness of 30 μm. In the bag, 123 holes having an opening area of 3.8 × 10 ⁻³ mm ² were opened so that the oxygen permeation rate per 100 g of loquat was 6500 cc / 100 g · 24 h · atm. About 340 g of loquat (Mogi) was put in this, sealed, and stored at 25 ° C. for 5 days.
<Comparative Example 12> A bag with an inner dimension of 200 x 250 mm is made of a biaxially stretched nylon film having a water vapor permeability of 180 g / m ² · 24 h · atm (at 40 ° C · 90% RH) and a thickness of 15 µm and anti-fogging processed. did. About 340 g of loquat (Mogi) was put in this, sealed, and stored at 25 ° C. for 5 days.
<Comparative Example 13> A bag having an inner size of 200 × 250 mm is formed of a biaxially stretched nylon film having a water vapor permeability of 180 g / m ² · 24 h · atm (at 40 ° C./90% RH) and a thickness of 15 μm and anti-fogging processed. did. Nineteen holes with an opening area of 3.8 × 10 ⁻³ mm ² were formed in the bag so that the oxygen permeation rate per 100 g of loquat was 1700 cc / 100 g · 24 h · atm. About 340 g of loquat (Mogi) was put in this, sealed, and stored at 25 ° C. for 5 days.
<Comparative Example 14> A bag having an inner size of 200 × 250 mm is formed from a biaxially stretched nylon film having a water vapor permeability of 180 g / m ² · 24 h · atm (at 40 ° C./90% RH) and a thickness of 15 μm and anti-fogging processed. did. In the bag, 200 holes having an opening area of 3.8 × 10 ⁻³ mm ² were formed so that the oxygen permeation rate per 100 g of loquat was 17640 cc / 100 g · 24 h · atm. About 340 g of loquat (Mogi) was put in this, sealed, and stored at 25 ° C. for 5 days.
Comparative Example 15 A bag having an inner size of 200 × 250 mm was formed with a moisture-proof cellophane film having a water vapor transmission rate of 1050 g / m ² · 24 h · atm (at 40 ° C. · 90% RH) and a thickness of 23 μm. Twenty-seven holes having an opening area of 7.2 × 10 ⁻³ mm ² were formed in the bag so that the oxygen transmission rate per 100 g of loquat was 2900 cc / 100 g · 24 h · atm. About 340 g of loquat (Mogi) was put in this, sealed, and stored at 25 ° C. for 5 days.

Water vapor permeability per 100 g of loquat of Comparative Examples 1 to 15 (g / 100 g · 24 h · atm, at 40 ° C., 90% RH), area ratio (%) occupied by the packaging material of the present invention in the packaging bag, per 100 g of loquat Table 3 shows the obtained values of oxygen permeation acceleration (cc / 100 g · 24 h · atm) and carbon dioxide permeation rate / oxygen permeation acceleration (CO ₂ P / O ₂ P). Table 4 shows the quality and weight loss (%) during storage.

  The present invention is a packaging material for maintaining the freshness of harvested loquat, and can be used as a packaging bag for maintaining the freshness of harvested loquat, and the loquat package using this packaging bag can maintain the freshness of loquat over a long period of time. Can keep.

Claims (10)

The water vapor transmission rate of the packaging material is 50 to 850 g / m ² · 24 h · atm (at 40 ° C. and 90% RH), and the oxygen concentration in the package of the loquat packaged using the packaging material is 15.5 to 19. A loquat packaging material characterized by 6% and a carbon dioxide concentration of 0.5 to 7%. The packaging material is nylon film, polystyrene film, moisture-proof cellophane film, nylon-vinyl acetate copolymer multilayer film having a nylon and vinyl acetate content of 5 to 25 wt%, nylon and ethylene vinyl alcohol copolymer multilayer film, The polystyrene and vinyl acetate content is any one selected from a multilayer film of ethylene-vinyl acetate copolymer having a content of 5 to 25% by weight or a multilayer film of polystyrene and ethylene vinyl alcohol copolymer. Loquat packaging material. 2. The loquat packaging material according to claim 1, wherein an oxygen permeation rate per 100 g of loquat of the packaging material is 2000 to 7000 cc / 24 hr · atm, and a ratio of carbon dioxide permeation rate / oxygen permeation acceleration is 0.7 to 2. 3. The opening area of one opening portion in the packaging material is 7.9 × 10 ^{−5 to} 5 × 10 ⁻² mm ² . The loquat wrapping material according to claim 1, comprising 500 pieces. A loquat packaging bag that is made into a bag using the packaging material according to claim 1. The loin packaging bag according to claim 5, wherein the packaging bag material includes the packaging material according to claim 1 and a film in which polyethylene or ethylene-vinyl acetate copolymer is laminated on paper or polyethylene terephthalate. 6. The loquat packaging bag according to claim 5, wherein the packaging material according to claim 1 occupies an area of 30% or more of the surface area of the entire packaging material. The loquat packaging bag according to claim 5, wherein the packaging bag has a zipper-type opening / closing member. A loquat package comprising the loquat packaging bag according to any one of claims 5 to 8, wherein loquat is packaged. The loquat package according to claim 9, wherein the loquat package is stored in a temperature range of 0 to 20 ° C, and the temperature range of 20 to 35 ° C is less than 24 hours.