JP3024480B2 - Packaging materials for fresh food - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging material which is excellent in freshness preserving performance when storing and preserving fresh food such as fresh fish and shellfish, meat and the like, and is suitable as a sheet for packaging such fresh food.

[0002]

2. Description of the Related Art
For fresh food, a storage bag made of a synthetic polymer film is used, and the fresh food is put in this storage bag and stored frozen. However, this preservation method is not suitable for long-term storage because dripping from fresh food accumulates on the film surface and the freshness of fresh food deteriorates due to this drip. It appears and causes deterioration of freshness, which is not preferable.

Therefore, recently, sheets have been developed which can absorb the drip to prevent deterioration of freshness and have an excellent freshness maintaining effect.
-122914, 57-167734, 58-
No. 107133 discloses a combination of a water-permeable film such as a heat-sealable nonwoven fabric or a perforated film and a moisture absorbent. Also, Japanese Patent Publication No. 58-58124 proposes a combination of a translucent film and a hyperosmotic substance mixed with an absorbent.

[0004] However, although these water absorbents can absorb drip from fresh foods, they have not yet significantly reduced freshness deterioration of fresh foods. That is,
For the determination of freshness, recently, adenosine triphosphate (A
TP) The metabolites adenosine diphosphate (ADP), adenosine monophosphate (AMP), inosine acid (IMP), inosine (HxR), and hypoxanthine (Hx) were measured, and HxR relative to the total amount of ATP metabolites was measured. The K value expressed by the ratio of the amount of Hx is often used. As an index of this K value, those with a K value of less than 20% can be eaten with sashimi,
More than 20% is used for boiled and grilled fish dishes,
It is said that those with 50% or more are unsuitable as foodstuffs. When the freshness retention performance is evaluated using this K value as an index of freshness, the above absorbent sheet cannot clearly suppress the increase in the K value of fresh food, and its freshness maintaining effect is hardly sufficient. Was.

[0005] Therefore, it is desired to develop a packaging material which can maintain freshness of fresh food satisfactorily.

The present invention has been made in view of the above circumstances,
It is an object of the present invention to provide a packaging material that can absorb the drip of fresh food satisfactorily when storing and preserving fresh food, can suppress an increase in the K value, and is excellent in freshness retention performance.

[0007]

The inventor of the present invention has made intensive studies to achieve the above object, and as a result, 10 ml /
By incorporating the inorganic chlorides in the absorbent sheet having m ² or more water absorption, fresh seafood, frozen fresh food meat, etc. or refrigerated to storage, when saving, drip arising from the fresh food Packaging material suitable as a packaging sheet for fresh foods, which can favorably absorb fresh food, suppress the increase in the K value of fresh food, have sufficient freshness, and have excellent freshness retention performance. Knowing that you can get
The present invention has been made.

Accordingly, the present invention is a packaging material for fresh food which absorbs fresh seafood or meat drip and suppresses an increase in the K value, and which has a water absorption of 10 ml / m ² or more. Provided is a packaging material for fresh food, characterized in that the inorganic sheet contains 0.05 to 10% by weight of an inorganic chloride in 99.95 to 90% by weight.

Hereinafter, the present invention will be described in more detail. In the packaging material of the present invention, the absorbent sheet has a water absorption of 10 ml / m ² or more, preferably 100 to 100 ml / m ^2.
Should be in the range of 1000 ml / m ^2, the water absorption is less than 10 ml / m ² poor drip absorbent, an object of the present invention is not achieved.

Examples of the material of the absorbent sheet include paper, fiber aggregates such as natural pulp fibers and synthetic resin fibers, and synthetic polymer water-absorbent films. Paper and natural pulp fiber aggregates are particularly preferable. . Materials other than those described above can be used as long as the water absorption is 10 ml / m ² or more.

On the other hand, examples of inorganic chlorides include potassium chloride, sodium chloride, magnesium chloride, ammonium chloride, calcium chloride and the like.

[0012] The packaging material of the present invention comprises 9 packaging materials.
9.95 to 90% (% by weight, hereinafter the same), particularly 99.8
９５95% is the absorbent sheet, and the content of the inorganic chloride is 0.05 to 10%, preferably 0.2 to 10% of the whole article.
5%. When the content of the inorganic chloride is less than 0.05%, prevention of deterioration of freshness is not remarkable. When the content exceeds 10%, the inorganic chloride is exposed on the surface or the strength is deteriorated.

[0013] As a method for incorporating the inorganic chloride into the absorbent sheet, for example, a method of adding the same at the time of papermaking,
A method of adding to a binder for binding to an aggregate of natural pulp fibers can be employed. Further, it is also possible to adopt a method of kneading in a synthetic polymer fiber or applying to various absorbent sheets.

In the packaging material of the present invention, it is desirable to laminate a water-impermeable film or sheet on the surface of the absorbent sheet containing an inorganic chloride opposite to the surface in contact with the packaged object such as food. This makes it possible to obtain a packaging material which is more excellent in the effect of preventing freshness, and which has freshness while maintaining freshness.

In this case, as the film or sheet-like material having no water permeability, a heat-fused polymer film such as a polyethylene film is exemplified, and it is preferable to laminate this on the above-mentioned absorbent sheet. . Furthermore, the packaging material of the present invention may be processed into a bag shape after laminating the hot-melt polymer film.

In the present invention, any other material than a water-impermeable film or sheet may be used on the opposite surface of the absorbent sheet. For example, paper, aluminum or the like may be used on one surface of the absorbent sheet. Lamination may be performed to improve the shape retention.

The packaging material of the present invention can be formed and used in various forms such as a sheet and a bag according to the purpose of use.

[0018]

The packaging material of the present invention can be used for storing or storing fresh foods such as fresh seafood and meats by freezing or refrigeration.
In addition to being able to favorably absorb the drip generated from fresh food, it is also possible to suppress an increase in the K value of the fresh food, sufficiently retain the taste, and have excellent freshness retention performance, and a sheet for packaging fresh food. It is suitable as.

[0019]

EXAMPLES The present invention will be described in detail below with reference to examples and comparative examples, but the present invention is not limited to the following examples.

Examples 1 to 4 and Comparative Examples 1 to 5 The effects of using actual foodstuffs were evaluated by the following methods. As shown in Table 1, a packing material in which various inorganic chlorides were impregnated with 0.3% of various inorganic chlorides into an absorbent sheet having various water absorption amounts was 20 cm × 3.
It was cut to 0 cm. After wrapping the tuna block as a food material into a cut of about 10 cm in length, 15 cm in width and about 1.5 cm in thickness, put it in a polyethylene packaging bag and store it in a refrigerator for 5 days or in a freezer for 14 days,
The measurement of the water absorption of the absorbent sheet and the evaluation of the freshness and taste of the fish and shellfish were performed by the following methods. Table 1 shows the results. Method for measuring water absorption of absorbent sheet: Using a contact water absorption tester, the water absorption of a 9 cm ² surface was measured and converted to per 1 m ² to obtain the water absorption. Evaluation method of freshness of foodstuff: K value of foodstuff was measured using K value measurement kit (manufactured by Daiichi Pharmaceutical Co., Ltd.). Deliciousness of food: Sensory evaluation was performed according to the criteria shown below. 5 points: very delicious, suitable for sashimi. 4 points: Delicious and suitable as sashimi. 3 points: Delicious, but acceptable for sashimi. 2 points: Not delicious, unsuitable as sashimi. 1 point: Not very delicious.

[0021]

[Table 1]

From the results shown in Table 1, the water absorption is 10 ml / m ^2.
Absorbent sheets (Comparative Examples 1 to 4) cause deterioration in freshness and taste, and a heat-fusible polymer film (polyethylene film, Comparative Example 5) having a water absorption of less than 10 ml / m ² is The deterioration of freshness was very large, and the taste was also reduced. On the other hand, the water absorption is 10 ml / m
^Two or more absorbent sheets impregnated with an inorganic chloride (Examples 1 to 4) have a significantly smaller freshness degradation, can maintain good taste, and can be packaged for a long time in frozen or refrigerated storage. It turned out to be.

[Examples 5 to 10 and Comparative Example 6] As shown in Table 2, a packaging material was prepared by changing the impregnation amount of sodium chloride into a fiber assembly sheet made of natural pulp fiber by using a polyacrylic binder. In the same manner as in Example 1, K
The value and the taste were evaluated.

From the results in Table 2, it can be seen that the salt containing 0.05% of salt (Example 5) has a smaller K value deterioration and is more delicious than the salt-free salt (Comparative Example 6). And 0.2% to 5% (Examples 6 to 8)
Showed further less deterioration in freshness and could maintain a satisfactory taste. In addition, those in which polyethylene (25 μm) was laminated on the outside (Examples 9 and 10) showed further less deterioration in freshness and an extremely high effect of maintaining deliciousness.

[0025]

[Table 2]

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Riki Takano 1460-1 Gendoji-cho, Fujinomiya City, Shizuoka Prefecture (56) References JP-A-5-124676 (JP, A) JP-A-58-98251 (JP, A) JP-A-1-299624 (JP, A) JP-A-61-148236 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B65D 65/00-65/46 B32B 27/00 -27/18 B01D 53/28 C08J 3/20

Claims (3)

(57) [Claims] 1. An absorbent sheet having a moisture absorption of 10 ml / m ² or more, which is a packaging material for fresh food which absorbs fresh fish and shellfish or meat drip and suppresses an increase in K value. A packaging material for fresh food, comprising 95 to 90% by weight of an inorganic chloride in an amount of 0.05 to 10% by weight. 2. The packaging material according to claim 1, wherein the absorbent sheet is selected from paper, natural pulp fiber aggregate, synthetic resin fiber aggregate, and synthetic polymer absorbent film. 3. The packaging material according to claim 1, wherein a film or a sheet having no water permeability is laminated on the surface of the absorbent sheet opposite to the surface in contact with the object to be packaged.