JP2003252380A - Crustacean package and manufacturing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a crustacean package and a manufacturing method therefor, with which preservability of crustaceans is improved and breakage of the package is prevented without glazing or using an antioxidant. <P>SOLUTION: The crustacean package and its manufacturing method comprises a step of packaging the crustaceans with a plastic film whose oxygen gas permeability under dry conditions at 0°C is 20 cm<SP>3</SP>/m<SP>2</SP>/d/atm or less and striking energy in an impact test at -10°C is 2.0 J or higher, and a step of hermetically sealing with a partial pressure of oxygen in a head space in the package of 8 mmHg or less. The package may be further defined by a thickness of the plastic film, a product of secant modulus in tension of 2.5% and a cross-sectional area, a degree of vacuum of the package or the like. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crustacean package and a method for producing the same, and more particularly, it is useful for refrigerating or refrigerating crabs, hermit crabs, shrimps, shrimp and other crustaceans. The present invention relates to a shellfish package and a method for producing the same.

[0002]

BACKGROUND OF THE INVENTION Most crustaceans such as crabs, hermit crabs, shrimp, and shrimp are edible.
As it is or divided into shoulders, legs, tails, etc., unheated or cooked (generally boiled), refrigerated
It is stored and distributed at (-2 to 10 ℃) or frozen (-2 to -60 ℃ or below).

[0003] Conventionally, frozen products have been subjected to a treatment for forming an ice film on the surface of crustaceans (glaze treatment) in order to prevent surface drying and oxidation during storage and distribution, but when frozen, It has problems such as increased drip and obscuration of net weight due to difficulty in adjusting the glaze amount. In particular, for unheated frozen products, in order to prevent blackening of joints and meat, it is necessary to add sodium sulfite, which is an antioxidant, but the standard value (less than 0.03g / kg) In addition to the burden on the producer side such as the necessity of management and labeling, there is also a problem that the use of such food additives does not meet the consumer's recent demand for additive-free foods.

[0004] For such a problem, for example, Japanese Patent Publication No. 7-89851
The publication discloses a method in which a seasoning solution is added to boiled crab-shaped crabs or crab legs, and the packaging material is sealed along the crab-shaped claw shape. However, in this method, if the amount of the seasoning liquid is too large, the crab may move inside the package after packaging, and the crab may be damaged. In addition, since it is packaged together with the seasoning liquid, there is a problem that the taste of the original material of the crab cannot be tasted.

[0005] Further, in Japanese Patent No. 3055830, the crab has a thickness of 1
30μm, gas permeability 10〜50cm ³ / m ²・ 24hr ・ atom @ 23
There is disclosed a technique of packaging a laminated film at 50 ° C. and about 50% RH, keeping oxygen or air in the package in a deaerated state and maintaining a pressure of 20 to 120 mmHg. However, in this case, under the degassing conditions, the contents and the film do not fit properly, and there is a gap (head space) between the contents and the film.
Therefore, when a temperature change occurs during frozen storage, there is a problem that the appearance of the product is deteriorated, such as frost adhering to the contents and ice particles accumulating in the head space portion. Also, in this degassed state, the film does not fit the contents properly, and the film and the contents are easily rubbed during transportation,
There is also a risk that pinholes may be easily induced.

[0006] Japanese Patent Laid-Open No. 3-35753 discloses a method of vacuum-packing shrimp with a plastic film. In this case, the gas permeability and thickness of the packaging material and the oxygen concentration in the package are not specified, and the quality of shrimp is not stable due to the difference in the type and thickness of the packaging material used and the oxygen concentration in the package. There is.

[0007] In addition, according to Hyogo Suisen Kenkyuho (31), 59-62, 1994 "Test for black discoloration prevention of frozen snow crab by low temperature deoxygenation method", unheated frozen snow crab together with an oxygen scavenger (low temperature ageless) Plastic packaging material (Eval film bag)
Although a technique of putting it in a container and sealing it is disclosed, in the same report, when it is put to practical use, the occurrence of pinholes is unavoidable, and the problem that the strength of the packaging material is insufficient is also raised.

[0008]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and uses a packaging material having a high oxygen barrier property and high strength for shellfish to form a head inside a package. By providing hermetically-sealed packaging with the space maintained at a low oxygen partial pressure, we provide a crustacean package that can maintain good crustacean quality without the need for glaze treatment or addition of antioxidants, and a method for producing the same. The purpose is to do.

[0009]

Means for Solving the Problems As a result of intensive studies conducted by the present inventors in order to achieve the above object, the crustaceans were dried at 0 ° C. (drying conditions in the present invention are 0% to 10% relative humidity). Oxygen gas permeability is 20 cm ³ / m ²
・ The oxygen partial pressure of the headspace in the package is adjusted by using a plastic film that has a d / atm or less and an impact energy of 2.0 J or more in an impact test at -10 ° C.
By hermetically wrapping it to 8 mmHg or less,
We have found that the above problems can be solved. That is, according to the present invention, the crustacean has an oxygen gas permeability of 20 cm ³ / m ² · d · atm or less under a dry condition of 0 ° C., and an impact energy in an impact test of −10 ° C. of 2.0 J or more. The present invention relates to a crustacean package in which a certain plastic film is hermetically sealed so that the oxygen partial pressure in the head space in the package is 8 mmHg or less.

Further, the present invention, the crustacean, oxygen gas permeability in a dry condition of 0 ℃ is 20 cm ³ / m ² · d · atm or less, and the impact energy in the impact test at -10 ℃. The present invention relates to a method for producing a crustacean package, in which a plastic film of 2.0 J or more is used and hermetically sealed so that the oxygen partial pressure in the headspace in the package is 8 mmHg or less.

According to the present invention, a crustacean has an oxygen gas permeability of 20 cm ³ / m ² · d · atm or less under a drying condition of 0 ° C and an impact energy in an impact test at -10 ° C. By using a plastic film that is 2.0 J or more to hermetically seal the headspace inside the package so that the oxygen partial pressure is 8 mmHg or less, the package has a tight sealing property and low oxygen partial pressure during the process of transportation and storage. Can be maintained, and without glaze treatment or addition of antioxidant,
It is possible to effectively suppress quality deterioration such as oxidation and drying of the contents.

[0012] Here, in the present invention, the degree of vacuum inside the crustacean packaging body is less than 20 mmHg, and the thickness of the packaging material is 40 μm or more and 300 μm or less, and 2
The product of 2.5% tensile secant elastic modulus and cross-sectional area at 3 ° C, 50% RH
It is preferably 1500 N or less. In the present invention,
The packaging material preferably has a layer made of stretched polyamide.

In the present invention, it is preferable that the packaging material has a polyester layer, a stretched polyamide layer, a gas barrier layer, and a polyolefin layer.

[0014] In the present invention, it is preferable that a water absorbing sheet is contained in the package. In the present invention, it is preferable that a tray made of either plastic or wood pulp is inserted in the package. The package of crustaceans of the present invention is suitably used for crustaceans selected from any of crabs, hermit crabs, shrimp and shrimp.

The shellfish package of the present invention is preferably used when the shellfish is unheated or cooked.
The shellfish package of the present invention is preferably used when the shellfish is a frozen product.

[0016] Further, the present invention comprises at least a crustacean and a packaging material for hermetically packaging the crustacean, which is a plastic film, and has an oxygen gas permeability of 20 cm ³ / m 2 under a drying condition of 0 ° C. ²・ d ・ atm or less and −10
Crustacean packaging characterized by packaging shellfish with a packaging material that has an impact energy of 2.0 J or more in an impact test at ℃, and seals it so that the oxygen partial pressure of the headspace in the package is 8 mmHg or less. A method of manufacturing a body. Further, in the production method of the present invention, it is preferable to include a water absorbing sheet in the package, and it is preferable to insert a tray made of either plastic or wood pulp.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described below in detail with reference to the drawings.
The crustacean package of the present invention is a crustacean package comprising a crustacean and a packaging material for hermetically packaging the crustacean, wherein the crustacean is sealed with the packaging material, wherein the packaging material is It is a plastic film and has an oxygen gas permeability of 20 cm ³ / m ² · d · atm or less under dry conditions at 0 ° C.
And the impact energy in the impact test at -10 ℃
The oxygen partial pressure of the head space in the package is 8 mmHg or less, as well as 2.0 J or more.

[0018] Here, the oxygen partial pressure of the head space in the package is set to 8 mmHg or less, more preferably 4 mmHg or less, and further preferably 2 mmHg or less. If the oxygen partial pressure in the headspace inside the package exceeds 8 mmHg, it is not preferable because blackening occurs near the joints when the crustacean is unheated and a strange odor occurs in the case of cooked products. . As a method of maintaining the oxygen partial pressure of the head space in the package at 8 mmHg or less, a method of inserting a deoxidizing material, a method of enclosing or replacing nitrogen or carbon dioxide gas alone or mixed, and a vacuum as described later. There is a method of vacuum packaging using a packaging machine or the like, and these methods can be appropriately used alone or in combination. When the method of enclosing carbon dioxide gas alone or in combination with nitrogen is used among the above, an effect of suppressing the growth of spoilage bacteria (bacteriostatic effect) can be expected. The oxygen partial pressure of the head space in the package here can be obtained by the following calculation formula. Vacuum degree inside the package (mmH
g) x oxygen concentration in headspace (%) = oxygen partial pressure in the headspace inside the package (mmHg)

[0019] The degree of vacuum inside the package is placed in a vacuum chamber (with a glass window) connected to a vacuum gauge such as a Pirani gauge, and the pressure in the chamber is gradually reduced from atmospheric pressure (760 mmHg). It can be known by reading the degree of vacuum at the time when a change such as swelling of the package is expressed. By the way, if the package is hermetically sealed without degassing, swelling of the packaging material will be observed immediately after the start of depressurization.
In this case, 760 mmHg. The oxygen gas concentration in the head space can be measured by collecting the gas in the head space with an airtight syringe and injecting it into a zirconia oxygen concentration meter. Depending on the degree of vacuum inside the package, it may not be possible to collect the gas in the head space. In that case, the oxygen gas concentration was considered to be 21% and the oxygen partial pressure inside the package was calculated.

[0020] The oxygen permeability of the packaging material under a drying condition of 0 ° C is 20 cm ³ / m ² · d · atm or less, but 15 cm ³ /
More preferably m ² · d · atm or less, 5 cm ³ / m ² · d · a
It is more preferable that it is tm or less. Oxygen gas permeability in the dry conditions of 0 ℃ of the packaging material ^{20 cm 3 / m 2 · d} · atm
When it exceeds, the oxygen partial pressure of the head space in the package becomes 8 mmHg or more during storage of the package, and the above-mentioned quality deterioration occurs, which is not preferable. The oxygen gas permeability of the packaging material here under the drying condition of 0 ° C is 0 ° C according to the isobaric method described in the gas permeability test method of plastic films and sheets (JIS K 7126). The values obtained by measurement under dry conditions are shown.

Further, the impact energy of the packaging material in an impact test at −10 ° C. is 2.0 J or more, more preferably 2.5 J or more, and further preferably 3.0 J or more. If the impact energy in the impact test at −10 ° C is less than 2.0 J, pinholes often occur due to protrusions of the contents when the frozen product is deaerated and packaged or transported, and the hermeticity of the package is impaired. However, the quality of the contents cannot be maintained, which is not preferable. Although it is difficult to specify the upper limit of impact energy, it is preferably 6.0 J or less in order to maintain an appropriate thickness and softness of the packaging material when packaging the shellfish.

The impact energy in the impact test at −10 ° C. here is the impact strength measuring device Drop- manufactured by Rheometrics.
It can be measured using Weight Tester RDT-500. In other words, in the measuring chamber kept at -10 ° C, the tip diameter is
It was calculated by calculating the value of maximum load (N) × displacement amount (m) when a weight of 1.27 cm and a weight of 4 kg was dropped at a speed of 200 cm / sec.

As the plastic film having both oxygen gas permeability and impact energy as described above, one made of a single material or a plurality of materials can be used.
Usually, a film in which two or more types of materials are laminated is used, and the material is not particularly limited, but polyester (polyethylene terephthalate, polybutylene terephthalate, etc.), polyamide (nylon 6, nylon 66,
Nylon 12, nylon 6 and nylon 66 copolymers, nylon 6 and nylon 12 copolymers, etc.), polyolefins (low density polyethylene, linear low density polyethylene, ultra low density polyethylene, etc. polyethylene; polypropylene; ethylene and A known thermoplastic resin such as a vinyl acetate copolymer; an ionomer) or polyvinyl chloride can be used, and polyvinylidene chloride, a copolymer of ethylene and vinyl alcohol, MXD nylon can be used as a gas barrier material. Resin such as is used. Note that 2
In the case of a film obtained by laminating more than one kind of material, it is manufactured by a coextrusion method or a laminating method.

[0024] Here, the degree of vacuum inside the crustacean packaging body of the present invention is less than 20 mmHg, and the thickness of the packaging material is
It is preferably 40 μm or more and 300 μm or less, and the product of 2.5% tensile secant elastic modulus and cross-sectional area at 23 ° C. and 50% RH is 1500 N or less. The degree of vacuum inside the crustacean packaging is 20
It is preferably less than mmHg, and more preferably 10 mmHg or less. Most preferably, it is 5 mmHg or less. By keeping the degree of vacuum below 20 mmHg, the packaging material tends to fit the contents relatively well and a good appearance as a product tends to be obtained. Also, for example, during transportation and storage of round crabs, even if the legs get damaged, the shape-retaining effect of the package keeps the legs apparently joined to the body. it can. further,
Even if the temperature changes during freezing storage and distribution, the gap (head space) between the contents and the packaging material becomes smaller, which tends to reduce the formation of frost and ice particles. The degree of vacuum inside the package can be determined by the method described above.

[0025] Further, the thickness of the packaging material is 40 μm or more, 300
The thickness is preferably μm or less, more preferably 40 μm or more and 200 μm or less, and further preferably 50 μm or more and 150 μm or less. By setting the thickness to 40 μm or more, the handling property when hermetically sealing crustaceans is improved. Also, by controlling the thickness to 300 μm or less, the fit of the contents in the hermetically sealed package is improved, and the environmental load can be mitigated by reducing the volume of the packaging material that becomes waste after use.

[0026] Furthermore, the packaging material at 23 ° C and 50% RH
The product of 2.5% tensile secant elastic modulus (N / mm ² ) and cross-sectional area (mm ² ) is 1500 N
It is preferably not more than 1400N, more preferably not more than 1400N and not less than 200N, and even more preferably not more than 1300N and not less than 200N. In the present invention, this product is an index representing the hardness (N) of the packaging material, and by having this value of 1500 N or less, a higher fitting property with respect to the contents can be obtained, and the packaging material is made of shellfish. There is a tendency that cracks and the like in the portion in contact with the protruding portion do not easily occur. Specifically, the product described above, which is an index of hardness (N), is the cross-sectional area of the plastic film [mm ² ;
(20 mm) and thickness (mm)] and 2.5% tensile secant modulus (Mpa or N / mm ² ). Here, the 2.5% tensile secant modulus is the tensile test method for plastic films and sheets.
Based on (JIS K7127), a test piece with a width of 20 mm and a length of 100 mm is subjected to a tensile test at a speed of 10 mm / min under conditions of 23 ° C and 50% RH, and an elongation of 2.5% (2.5 mm) occurs. Load (N)
Is the cross-sectional area of the test piece [mm ² ; test piece width (20 mm) × thickness (mm)] and then multiplied by 40 (= 100% / 2.5%). The larger the value of this tensile secant elastic modulus, the larger the force required to give a strain of 2.5%, indicating that the material is less likely to deform.

[0027] Further, in the present invention, it is preferable that the packaging material has a layer made of stretched polyamide. Polyamide is nylon (nylon 6, nylon 66, nylon 12, copolymer of nylon 6 and nylon 66, nylon 6
And a nylon 12 copolymer), the resin has excellent strength in a low temperature range and low oxygen gas permeability, and thus can be suitably used for the shellfish package of the present invention. . In addition, since the polymer chains are oriented by performing a stretching treatment during the film production, a relatively high strength is exhibited even with a thin thickness, which is also preferable in terms of pinhole resistance. Further, it is preferable to use a film having a heat-shrinkability due to the stretched orientation because the film tends to have a better fit to the contents when it is degassed and sealed and then immersed in hot water to shrink the film.

[0028] Here, as the plastic film that can be preferably used in the present invention, polyamide / polyolefin, polyolefin / polyamide / polyolefin, polyamide
/ Gas barrier material / polyolefin, polyester / polyamide / polyolefin, polyester / polyamide / gas barrier material / polyolefin and other laminated materials,
More specifically, the following is exemplified. Among these, a laminated material having a layer made of stretched polyamide is particularly suitable. (In order from the outer layer to the inner layer from the left, // indicates that there is an adhesive layer between the layers,
(The value on the right shoulder of each resin name indicates the thickness (μm)) (1) LLDPE ¹⁴ // Ny ²² // EVA ⁴⁸ (2) PET ² // Ny6-66 ¹⁴ / EVOH ⁴ // LLDPE ³⁶ (3) PET ² // Ny6-66 ²⁵ / EVOH ³ // VLDPE ⁵⁹ (4) PET ² // Ny6-66 ³⁴ / EVOH ⁵ // VLDPE ⁸¹ (PET: polyethylene terephthalate, Ny6-66: nylon 6
And nylon 66 copolymer, EVOH: ethylene and vinyl alcohol copolymer, LLDPE: linear low density polyethylene,
VLDPE: Ultra-low density polyethylene, EVA: Copolymer of ethylene and vinyl acetate, Ny: Nylon) In the above examples (2), (3) and (4), a polyethylene terephthalate layer is included as the outermost layer. Therefore, there is an advantage that the gloss and printability of the film are improved.

[0029] Further, in the present invention, it is preferable to include a water absorbing sheet in the package. By inserting the water absorbent sheet into the package, the drip that occurs when the crustaceans are stored for a long time or when the frozen product is thawed is absorbed by the water absorbent sheet, and when the shells are opened and the crustaceans are used as food,
It is possible to handle the fingers without soiling them. Also,
By inserting the water absorbing sheet so as to contact the protrusions existing on the skin of the crustacean, the pinholes in the plastic film can be more effectively prevented. The water-absorbent sheet to be used is not particularly limited, but starch-based, cellulose-based, polyacrylate-based, polyvinyl alcohol-based, polyacrylamide-based, polyoxyethylene-based, or other synthetic resin-based ones may be used alone or in combination. Can be used.

[0030] Further, in the present invention, it is preferable that a tray made of either plastic or wood pulp is inserted into the package. By placing the contents on the tray, the shape-retaining property can be improved and the workability at the time of producing the package can be improved. As long as the tray is made of either plastic or wood pulp, the material and shape of the tray are not particularly limited, but as the plastic, polypropylene, expanded polypropylene, polystyrene, expanded polystyrene, polyethylene terephthalate, etc. ,
Paperboard and the like can be used as an example of the raw material. On the other hand, the shape may be a shape formed by roughly matching the shape of the shellfish as the content, a general tray shape, or a simple sheet shape.

[0031] The crustacean package of the present invention may be any shellfish selected from crabs, hermit crabs, shrimps, and shrimp, and in particular, snow crab, red snow crab, king crab, Hanasaki crab, hair crab, crab,
It is preferably used when using spiny lobster, prawn, shrimp, and shrimp. Each shape is not particularly limited, but in the case of a crab, a round figure, shoulders or sections (joint of the foot and the base of the foot), foot body
(Shelled or unshelled) and shrimp have a headed shape or tail (removed head, legs and torso).

[0032] In addition, the crustacean package of the present invention,
It is preferably used when unheated or cooked. Examples of the cooking method include boiling (boil), seasoning, steaming, roasting, and the like, which can be suitably used for crustaceans that have been subjected to any or a plurality of treatments. In addition, the crustacean packaging of the present invention, shellfish,
It is preferably used when it is a frozen product. For example, in the case of frozen boiled snow crab and boiled king crab, the conventional product is boiled while the freshness after catching is high, and then quickly frozen and glaze to become a product. The package is hermetically packaged without performing glaze treatment, and can be frozen and stored while maintaining high quality.

[0033] The drawings show an example of a crustacean packaging body according to the present invention, and Figs. 1 and 2 show a packaging example using large crab shoulders such as snow crab and king crab as the crustaceans. Figure 1 uses a pouch (2) molded in the shape of a bag as a plastic film. After inserting the crustacean (1), the oxygen partial pressure in the internal headspace is 8 mmHg.
It is below, and the degree of vacuum is controlled to be less than 20 mmHg, and the vicinity of the mouth is sealed with a heat seal (3). In Fig. 2, the shellfish (1) is placed on a plastic film or sheet (2) that has been heat-molded in the shape of a tray, and in a vacuum condition of less than 20 mmHg, another plastic film (3) is covered from the top and sealed. A so-called deep-drawing package is exemplified. In addition, (4) is a heat seal part.

[0034] Fig. 3 and Fig. 4 exemplify a crustacean package using a tray. FIG. 3 shows an example of vacuum packaging using a tray (2) having a shape that roughly follows the shape of the content (1). The contents are placed in a tray, which is inserted into a pouch (3) formed from a plastic film into a bag shape and vacuum-packaged. In addition, (4) is a seal part. In addition to improving the appearance of the product, the tray prevents the projections of the crustacean skin from directly contacting the plastic film, so it can be expected to prevent pinholes.

[0035] Fig. 4 shows an example in which a crab leg (1) is placed in a plastic tray (2) such as polypropylene, and is wrapped with a plastic film (4) together with an oxygen scavenger (3) to be pillow-wrapped. In addition, (5) shows a seal part. If a packaging material having heat shrinkability is used, after pillow packaging, by passing through a shrink tunnel in which hot air circulates,
You can make beautiful packaging with a tight film.

[0036] A method for manufacturing a crustacean package according to the present invention will be described below with reference to a flowchart based on an example of a crab. The manufacturing method of the present invention is not limited to the following examples.

[0037] First, a crab that has been caught and landed is used as a raw material. Crabs can be left in their raw state, or they can be heat-treated (boiled, seasoned, steamed, roasted) as in step 1, and then processed into a round state, shoulders, or legs. (Step 1). In step 2, the tip of the crab's foot and the projections on the shell surface may be trimmed and molded to facilitate packaging and distribution. Trimmed crabs are packaged as they are without freeze treatment.
It is sent to (Step 4) or is rapidly frozen by means such as air-cooling type, brine type or liquid nitrogen method for the purpose of maintaining quality for a long time (Step 3), and packaging process
It is sent to (Step 4). In addition, the above steps are not necessarily 1 to 4
It is not necessary to carry out in the order of, for example, the packaging process (process 4)
After that, a freezing treatment (step 3) can be performed and other appropriate adjustments can be made. The packaged crab is usually stored and chilled (-2 to 10 ° C) or frozen (-2 ° C to -60 ° C).

[0038] As the packaging method, a conventional method can be used as long as the oxygen partial pressure of the head space in the package is 8 mmHg or less, such as vacuum packaging, oxygen scavenger-encapsulated packaging,
A combination of vacuum and oxygen scavenger encapsulation, gas-filled packaging, etc. are preferably used. In addition, as the form of the package, a pillow package, a pouch package (the pouch shape includes a bottom seal pouch, a three-way seal pouch, etc.), a deep-draw package, and the like can be considered. The means for obtaining the above-mentioned package is not particularly limited, but as a means for obtaining the pouch package by vacuum packaging, there is a method using a chamber-type vacuum packaging machine or a nozzle-type vacuum packaging machine. By packaging together with it, it is possible to use the vacuum together with the oxygen-containing oxygen-containing package. The pillow wrapping body is obtained by using a pillow wrapping machine, and the deep-drawing wrapping body is obtained by using a deep-drawing vacuum wrapping machine or a deep-drawing gas filling wrapping machine.

[0039] In the packaging step (step 4), a water absorbing sheet may be inserted together with the contents. In this case, the water-absorbent sheet to be used is not particularly limited, but a starch-based, cellulose-based, polyacrylate-based, polyvinyl alcohol-based, polyacrylamide-based, polyoxyethylene-based, or other synthetic resin-based one may be used alone or You may use in combination. Similarly, in the packaging step, the contents may be placed on a tray made of either plastic or wood pulp and inserted into the package for packaging. In this case, the material and shape of the tray is not particularly limited, but as the plastic, polypropylene, expanded polypropylene, polystyrene, expanded polystyrene, polyethylene terephthalate, etc., and as the wood pulp, paperboard etc. can be exemplified as a raw material, while, The shape may be a general tray shape or a simple sheet shape. In some cases, after sealing in the packaging process, heat treatment with hot air, hot water, steam, etc. is performed for a short time to cause the plastic film to shrink, and the fit of the packaging material to the contents or the “tightness” of the package. Can be further improved. Thus, at least the crustaceans and the packaging material for hermetically packaging the crustaceans, the packaging material is a plastic film, the oxygen gas permeability in a dry condition of 0 ℃ 20 c
m ³ / m ² · d · atm or less, and the impact energy in impact test at −10 ° C is 2.0 J or more, and the oxygen partial pressure of the headspace in the package is 8 mmHg or less. To produce a crustacean package.

[0040]

[Example] Example 1 PET ² // Ny6-66 ²⁵ / EVOH ^{3 with} unheated red snow crab shoulders
// VLDPE ⁵⁹ total thickness 90 μm, width 200 mm × length 35
It was placed in a 0 mm plastic pouch and packaged so that the oxygen partial pressure in the headspace was 7 mmHg, to obtain a package of red bean crab shoulder meat. The film of the plastic pouch has an oxygen gas permeability of 3 c in a dry condition of 0 ° C.
Impact energy in impact test at m ³ / m ² · d · atm, -10 ℃ is 3.10 J, 2.5% at 23 ℃, 50% RH
The product of the tensile secant elastic modulus and the cross-sectional area was 783 N was used. Examples 2 to 19 Shrimp shoulder crab meat and the like were packaged according to the method of Example 1 under the conditions shown in Table 1 below.

【table 1】

[Continued from Table 1] Next, the present invention will be specifically described with reference to examples, but the present invention should not be construed as being limited to the examples.
Further, the effects of the present invention will be described with reference to experimental examples. 1. Experiment 1 The relationship between the oxygen partial pressure in the head space inside the package and the color tone of the contents was shown. Unheated red snow crab shoulders as contents and PET ² // Ny6-66 ²⁵ / E as packaging material
VOH ³ // VLDPE ⁵⁹ total thickness 90μm, width 200mm × length 35
Using a 0 mm plastic pouch, Comparative Example 1 (aerated packaging), Comparative Example 2 (deaerated packaging), Example 1 (nitrogen gas filled packaging), Example 2 (deoxidant filled packaging), Example 3 ( Vacuum packaging) and Example 4 (vacuum + oxygen scavenger enclosed packaging) were packaged under the conditions shown in [Table 2] to produce a package of red-necked crab shoulders. Then, these packages were subjected to an experiment.

[0041] Comparative Example 1 (aerated packaging) is one in which the contents are put in the above packaging material and the mouth is heat-sealed and hermetically sealed. In Comparative Example 2 (deaeration packaging), the contents are put in the above packaging material,
By the chamber type degassing method, the package is degassed and hermetically sealed under the condition that the inside of the package has a vacuum degree of 72 mmHg. In Example 1 (packaging filled with nitrogen gas), the contents were put in the above packaging material, the inside of the package was replaced with nitrogen gas, and the package was sealed. In Example 2 (packaging containing oxygen scavenger), the contents were put in the above packaging material and the oxygen scavenger (Ageless SS100 manufactured by Mitsubishi Gas Chemical Co., Inc.)
Is enclosed and packaged. In Example 3 (vacuum packaging), the contents are put in the above packaging material,
It is vacuum-packaged by the chamber degassing method under the condition that the inside of the package has a vacuum degree of 5 mmHg. In Example 4 (vacuum + oxygen absorber enclosed package), the contents and oxygen absorber (Ageless SS100 manufactured by Mitsubishi Gas Chemical Co., Inc.) were added to the above packaging material.
Then, it is vacuum-packaged by the chamber type degassing method under the condition that the inside of the package has a vacuum degree of 5 mmHg.

[0042] As an evaluation method, after each sample was prepared, it was frozen in a freezer at -50 ° C overnight, and then stored in a freezer at -25 ° C for one month. Then, it was left unopened in a refrigerator at 5 ° C overnight, and the color tone of the contents after thawing was evaluated by three panels. The results are shown in Table 2. As a result, as in Examples 1 to 4, when the oxygen partial pressure in the headspace was 8 mmHg or less, no blackening of the contents was observed, and it became clear that good quality could be maintained.

[0043]

[Table 2] 2. Experiment 2 The oxygen gas permeability of the packaging material and the color tone of the contents
Showed a relationship. Unheated red snow crab shoulders
And cloves are packed under the conditions described in [Table 3].
A shoulder pack was produced. That is, compared to packaging materials
Example 3 (Ny^Five// LLDPE ⁶⁰, O₂TR (acid under dry condition at 0 ℃
Elementary transparency; same below): 55 cm³/ m²・ D ・ atm) (total thickness 6
5 μm), Comparative Example 4 (Ny^Ten// LLDPE⁶⁰, O₂TR: 25 cm³/ m²・ D
・ Atm) (total thickness 70 μm), Example 5 (LLDPE¹⁴// Ny^{twenty two}//
EVA⁴⁸, O₂TR: 10 cm³/ m²・ D ・ atm) (total thickness 85μm),
Example 6 (PET²// Ny6-66¹⁴/ EVOH^Four// LLDPE³⁶, O₂TR: 3 c
m³/ m²・ D ・ atm) (total thickness 60 μm) was used. Obtained parcel
Each package was subjected to evaluation.

[0044] The evaluation method is 5 mmHg after putting the contents in each packaging material.
It was vacuum-packed under conditions such that the degree of vacuum was 1, frozen at −50 ° C. overnight, and stored at −18 ° C. for 1 month. Then, the oxygen partial pressure of the head space in the package was determined by the above method, and the discolored state of the contents was evaluated. The results are shown in Table 3. From Table 3, as in Examples 5 and 6, the oxygen gas permeability in a drying condition of 0 ° C. is 20 cm ³ / m ² · d · atm.
It was found that by using the following packaging materials, the oxygen partial pressure in the headspace inside the package was kept below 8 mmHg, no blackening of the contents was observed, and good quality was retained.

[0045]

[Table 3]

[0046] 3. Experiment 3 Impact energy of the packaging material at -10 ° C
Of bag breakage during vacuum packaging and frozen transportation
Showed a relationship. Frozen boiled snow crab shoulders for contents
Frozen boiled snow crab shoulders packed under the conditions described in [Table 4]
A body wrap was manufactured. That is, a comparative example for packaging materials
5 (PET^1.5// Ny6-66⁸/ EVOH^Five// LLDPE^{twenty one}) (Total thickness 39μ
m), Comparative Example 6 (VLDPE³/ EVA^{twenty two}/ / PVDC⁷// EVA¹⁵/ Ionomer
^Ten) (Total thickness 60 μm), Comparative Example 7 (Ny¹⁵// LLDPE⁶⁰) (Total
Thickness 75 μm), Comparative Example 8 (Ny^{twenty five}// LLDPE⁶⁰) (Total thickness 85μ
m), Example 7 (LLDPE¹⁴// Ny^{twenty two}// EVA⁴⁸) (Total thickness 85μ
m), Example 8 (PET ²// Ny6-66¹⁴/ EVOH^Four// LLDPE³⁶) (Total thickness
60 μm), Example 9 (PET²// Ny6-66^{twenty five}/ EVOH³// VLDPE⁵⁹)
(Total thickness 90 μm), Example 10 (PET²// Ny6-66³⁴/ EVOH^Five/ /
VLDPE⁸¹) (Total thickness 125 μm) was used. The obtained package
Each was subjected to evaluation. The evaluation method is the contents of each packaging material.
In a vacuum package under conditions such that the vacuum degree is 5 mmHg or less.
And immediately after returning the chamber to atmospheric pressure.
Packing rate of the body and packing those packaging in a cardboard box
Round-trip overland between Ishioka City, Ibaraki Prefecture and Yaizu City, Shizuoka Prefecture at -18 ° C
The bag breakage rate after frozen transportation was evaluated. -10 for each packaging material
The relationship between impact energy at ℃ and each bag breakage rate [Table 4]
It was shown to. As in Examples 7-10, the impact energy value
Vacuum packaging is possible by using packaging materials of 2.0 J or more.
The bag breakage rate immediately after was 0%, and the bag breakage rate after frozen transportation was 10%.
I was able to suppress it to the following.

[0047]

[Table 4]

4. Experiment 4 The relationship between the hardness of the packaging material and the appearance and characteristics of the vacuum packaged package was shown. A frozen boiled snow crab shoulder body was manufactured under the conditions shown in [Table 5] using frozen boiled snow crab shoulder body as the contents. That is,
As packaging materials, Comparative Example 9 (amorphous PET ³⁰⁰ ) (total thickness 300 μm), Comparative Example 10 (Ny6 ¹²⁵ ) (total thickness 125 μm), Comparative Example 11 (EVA ¹⁶ // LLDPE ⁴¹ ) (total thickness 60 μm), implemented Example 11
(Ny6 ³¹ / Ny6-66 ¹⁵ // LLDPE ²⁰⁰ ) (total thickness 250 μm), Example 12 (PET ² // Ny6-66 ³⁴ / EVOH ⁵ // VLDPE ⁸¹ ) (total thickness 125 μ
m), Example 13 (PET ² // Ny6-66 ²⁵ / EVOH ³ // VLDPE ⁵⁹ )
(Total thickness 90 μm), Example 14 (PET ² // Ny6-66 ¹⁴ / EVOH ⁴ // L
LDPE ³⁶ ) (total thickness 60 μm), Example 15 (LLDPE ¹⁴ // Ny ²² //
EVA ⁴⁸ ) (total thickness 85 μm) was used. The obtained package is
Each was subjected to evaluation. For the evaluation method, the contents were put in each packaging material, vacuum-packed under the condition that the vacuum degree was 5 mmHg or less, and the appearance of the finished package was evaluated by three panelists. The results are shown in Table 5, and as in Examples 11 to 15,
By using a packaging material having a hardness of 1500 N or less, it was possible to obtain a packaging body having a relatively good fit to the contents and a good appearance.

[0049]

[Table 5] When the hardness was less than 200 N, there was a problem that pinholes were generated due to sharp protrusions of snow crab.

5. Experiment 5 The relationship between the degree of vacuum during degassing or vacuum packaging and the appearance of the package was shown. Frozen boiled king crab shoulders were used for the contents, and a package of frozen boiled king crab shoulders was manufactured according to the conditions of [Table 6]. That is, PET ² // Ny6-66 ²⁵ / EVOH ³ // VLDPE ⁵⁹
Using the film of the structure of (the same film as used in Examples 1, 2, 3, 4, 9, 13), in a pouch of width 250 mm × length 450 mm
Put the contents, vacuum degree is 50 mmHg (Comparative example 12), 25 mmHg
(Comparative Example 13), 17 mmHg (Example 16), 12 mmHg (Example 1)
7), 8 mmHg (Example 18) and 4 mmHg (Example 19) were subjected to deaeration or vacuum packaging, and the appearance of the finished package was evaluated by three panelists. The results are shown in [Table 6]. As in Examples 16 to 19, by setting the degree of vacuum to less than 20 mmHg, it is possible to obtain a package having a relatively good fit and a good appearance. I was able to.

[0051]

[Table 6]

[0052]

EFFECTS OF THE INVENTION According to the present invention, when the crustaceans are hermetically sealed, a plastic film having an oxygen gas permeability of a specific value or less and an impact energy of a specific value or more is used at a specific oxygen partial pressure or less. Since it is hermetically sealed, blackening that occurs during storage of crustaceans can be prevented, and damage to the package during transportation can be prevented. In the present invention, further the degree of vacuum inside the package,
If specified by the product of the thickness of the packaging material, the 25% tensile secant elastic modulus at 23 ° C. and 50% RH, and the cross-sectional area, its storability and transportability can be further improved.

[Brief description of drawings]

[Figure 1] Shows a front view of a package when a large crab shoulder is packaged in a pouch

[Explanation of symbols]

1: Shoulder of large crab 2: Pouch 3: Heat seal part

FIG. 2 shows a vertical cross-sectional view of a deep-drawing package for the shoulder of a large crab.

[Explanation of symbols]

1: Shoulder of a large crab 2: Plastic film or sheet (bottom material) deep-drawn into a tray shape 3: Plastic film (lid material) 4: Heat seal part

FIG. 3 shows a perspective view of a package in which crabs are placed in a tray and vacuum packaged.

[Explanation of symbols]

1: crab 2: tray 3: Pouch 4: Seal part

[FIG. 4] (a) is a perspective view of a package in which a crab leg is pillow-wrapped with an oxygen absorber as viewed from above. (b) shows a perspective view of the empty package seen from below.

[Explanation of symbols]

1: crab legs 2: tray 3: oxygen absorber 4: plastic film 5: Seal part

Continued front page    (72) Inventor Takahisa Ueyama             18-13 Kamizamari, Taiza Village, Shinji District, Ibaraki Prefecture F-term (reference) 3E067 AA11 AB01 BA10B BA12C                       BB14B BB14C CA06 CA30                       EA06 FA04 FB11 FC01 GA19                       GB09 GD01

Claims (12)

[Claims] 1. A crustacean package comprising a shellfish and a packaging material for hermetically packaging the shellfish, the shellfish being sealed by the packaging material, wherein the packaging material is a plastic film, Oxygen gas permeability under dry condition of 0 ℃ is 20 cm ³ / m ² · d · atm or less, and −10 ℃
The impact energy in the impact test was 2.0 J or more, and the oxygen partial pressure in the headspace inside the package was 8 J
Package of crustaceans characterized by being less than mmHg 2. The degree of vacuum inside the shell of the shellfish is 20 mmHg.
And the thickness of the packaging material is 40 μm or more, 30
The shell of the crustacean according to claim 1, which is 0 μm or less, and has a product of 2.5% tensile secant modulus and cross-sectional area of 1500 N or less at 23 ° C. and 50% RH. 3. The crustacean package according to claim 1, wherein the packaging material has a layer made of stretched polyamide. 4. The crustacean package according to claim 3, wherein the packaging material has a polyester layer, a stretched polyamide layer, a gas barrier layer, and a polyolefin layer. 5. The crustacean package according to claim 1, wherein the package contains a water absorbing sheet. 6. The crustacean packaging body according to claim 1, wherein a tray made of either plastic or wood pulp is inserted into the packaging body. 7. The crustacean packaging according to any one of claims 1 to 6, wherein the crustacean is selected from crabs, hermit crabs, shrimp and shrimp. body. 8. The crustacean package according to any one of claims 1 to 7, wherein the crustacean is unheated or cooked. 9. The crustacean package according to any one of claims 1 to 8, wherein the crustacean is a frozen product. 10. At least a shellfish and a packaging material for hermetically sealing the shellfish, the packaging material is a plastic film, and the oxygen gas permeability in a drying condition of 0 ° C. is 20 cm ³ / m ² · d.・ Pack shellfish with a packaging material that is atm or less and has an impact energy of 2.0 J or more in an impact test at -10 ° C, and seal it so that the oxygen partial pressure of the headspace in the package is 8 mmHg or less. A method for producing a crustacean package, comprising: 11. The method for producing a crustacean package according to claim 10, wherein a water absorbing sheet is contained in the package. 12. The method for producing a crustacean package according to claim 10, wherein a tray made of either plastic or wood pulp is inserted into the package.