JPH0761234B2 - Gelatin film - Google Patents

Description

TECHNICAL FIELD The present invention relates to a gelatin film used as a packaging material.

[Conventional technology]

Since gelatin forms a strong film, a plastic film is generally used as a packaging film. When a plastic film is used for packaging various seasonings, seasonings, drugs, etc., it is necessary to remove or tear the film to take out the contents.

The use of soluble or edible films in packaging allows the contents to be used or eaten without removal.

Since a film made of gelatin is soluble in warm water, is edible and strong, it is expected to have a new use as a packaging film.

However, since a film made of gelatin has a high moisture vapor transmission rate (water vapor permeability), moisture easily penetrates into the film, which causes the packaged item to become damp or deteriorate.

On the other hand, addition of sorbitol or glycerin to a film made of gelatin is known to change the water vapor transmission rate of the film (Tadao Ida, Shoji Takahashi et al.
Vol. 28, No. 3, pp. 209-213, 1968).

However, according to the research conducted by the inventors, the gelatin film to which sorbitol or glycerin is added has a large decrease in physical strength, particularly tensile strength, as compared with a film made of gelatin alone.

[Problems to be Solved by the Invention]

An object of the present invention is to provide a gelatin film having very low moisture permeability and excellent tensile strength.

[Means for Solving the Problems]

The present invention provides a gelatin film used as a packaging material, which is a film-like dried product containing gelatin and a moisture permeability improving agent.
The moisture permeability improving agent is at least one selected from the group consisting of glucose, maltose, fructose, a linear oligosaccharide mixture, a branched oligosaccharide mixture, fruit juice, honey and mirin.

[Action]

By using gelatin and at least one moisture permeability improving agent selected from the group consisting of glucose, maltose, fructose, a linear oligosaccharide mixture, a branched oligosaccharide mixture, fruit juice, honey and mirin, It is possible to reduce the decrease in the physical strength and the moisture permeability.

〔Example〕

In the present invention, as the gelatin, both acid-treated gelatin and alkali-treated gelatin can be used, and the type thereof is not particularly limited.

The moisture permeation improver is selected from the group consisting of glucose, maltose, fructose, linear oligosaccharide mixture, branched oligosaccharide mixture, fruit juice, honey and mirin, which may be used alone or in combination of two or more. it can.

For example, monosaccharides such as glucose and fructose tend to have a larger effect of reducing the water vapor permeability than oligosaccharides such as a mixture of oligosaccharides.
On the other hand, the decrease in physical strength tends to be smaller in oligosaccharides than in monosaccharides, for example. Considering these tendencies, it is preferable to appropriately select the type of the moisture permeability improving agent to be added depending on the application of the gelatin film.

The amount of the moisture permeability improving agent added is preferably 5 to 40% by weight based on the gelatin in terms of the amount of sugar contained in the moisture permeability improving agent. If it exceeds this range, the physical strength of the film may be excessively decreased, and if it is below this range, the moisture permeability may be decreased too little.

The gelatin film of the present invention is not limited to the compounds contained in fruit juice such as sugar and organic acids such as citric acid, proteins, lipids, vitamins and minerals, as long as it does not hinder the achievement of the object of the present invention. , Dyes, etc. may be added.

The method for producing the gelatin film of the present invention is not particularly limited. For example, a method in which gelatin and a moisture permeability improving agent are mixed in a solution state, the mixed solution is applied to a mold or roll, cooled and dried to form a film, and the film is peeled to obtain a gelatin film. Is available. The application of the mixed solution can be performed by, for example, a casting method using a doctor knife or an air knife, a gravure coating method, a dip coating method, or the like, but is not limited thereto. The thickness of the gelatin film can be adjusted, for example, by changing the coating thickness of the mixed solution. Alternatively, a gelatin film having a desired thickness can be obtained by repeating once or more the steps of forming a film by forming a film by further applying a mixed solution on the film after forming the film.

The mixed solution preferably has a pH of 2 to 9 from the viewpoint of preventing the deterioration of the physical properties of the gelatin film.
If the pH of the mixed solution is less than 2, the physical properties of gelatin are severely deteriorated and the quality of the film itself may be deteriorated. When the pH of the mixed solution is higher than 9, quality deterioration and browning may occur.

The gelatin film of the present invention is used, for example, as a film or after being formed into a bag or a container to wrap various things. The use form is not particularly limited. The contents are not particularly limited, for example,
There are powder seasonings, powder bath agents, oily seasonings, oily medicines and the like. Since the gelatin film of this invention can be heat-sealed, it is not necessary to use an adhesive if it is heat-sealed when used for packaging. An adhesive may be used when heat sealing is not performed. In addition, since the gelatin film of the present invention can be printed on the surface thereof, the contents can be displayed or a design can be drawn by printing.

The gelatin film of the present invention has a lower water vapor transmission rate than a soluble film consisting only of gelatin, and there is almost no decrease in physical strength without using a reinforcing material. Therefore, when the gelatin film of the present invention is used for packaging, it is not necessary to cover the outside with a plastic film or the like, and the strength as a packaging material can be secured. Further, since the gelatin film of the present invention is soluble, the one wrapped with this film can be used without tearing or peeling the film.

Hereinafter, specific examples will be shown together with comparative examples, but the present invention is not limited to the following examples.

-Examples 1-3-Alkali-treated beef bone gelatin (viscosity 33 mP, jelly strength 310
Bloom, pH 5.5) was dissolved in warm water to give a 25% by weight gelatin solution A.

Glucose as a moisture permeability improving agent was added to this gelatin solution A at a ratio shown in Table 1 with respect to gelatin, dissolved and mixed.

After thoroughly degassing this mixed solution, use a TLC electric applicator (H-3035 / Mutual Rikagaku Glass Mfg. Co., Ltd.)
It was applied on an acrylic plate of mm × 200 mm × thickness 6 mm so as to have a thickness of 200 μm, and cooled at 10 ° C. for 20 minutes to form a film. Then, it was dried under ventilation at 25 ° C. and 60% RH for 2 hours and peeled from the acrylic plate to obtain a gelatin film.

The glucose used here had the sweetness degree shown in Table 2.

-Examples 4 to 6-Examples 1 to 6 except that fructose was used in place of glucose in the proportions shown in Table 1 as the moisture permeability improving agent.
A gelatin film was obtained in the same manner as in 3.

The fructose used here had the sweetness degree shown in Table 2.

-Examples 7 to 9-Examples 1 to 3 except that maltose was used in place of glucose as the moisture permeability improving agent in the ratio shown in Table 1.
A gelatin film was obtained in the same manner as in.

The maltose used here had the sweetness degree shown in Table 2.

-Examples 10 to 12-A gelatin film was obtained in the same manner as in Examples 1 to 3 except that a linear oligosaccharide mixture was used in place of glucose as the moisture permeability improving agent in the ratio shown in Table 1. .

The linear oligosaccharide mixture used here was a product name “Oligotose” manufactured by Niken Chemical Co., Ltd., and had the composition and sweetness shown in Table 2.

-Examples 13 to 15-A gelatin film was obtained in the same manner as in Examples 1 to 3 except that a branched oligosaccharide mixture was used in place of glucose as the moisture permeability improver in the ratio shown in Table 1.

The branched oligosaccharide mixture used here was a product name “ISO” (branched oligosaccharide mixture) manufactured by Nippon Sanyo Kogyo Co., Ltd., and had a composition shown in Table 3.

—Example 16— Similar to Examples 1 to 3 except that concentrated apple juice (Alps Foods Co., Ltd.) was added to the gelatin solution A at a ratio of sugars shown in Table 1 instead of adding glucose. A gelatin film was obtained.

The concentrated apple juice used here contained sugar at a ratio of 50.7 g per 100 g.

—Example 17— Examples 1 to 3 except that concentrated grape juice (manufactured by Alps Foods Co., Ltd.) was added to the gelatin solution A in place of glucose so that the sugar ratio was as shown in Table 1.
A gelatin film was obtained in the same manner as in.

The concentrated grape juice used here contained sugar at a ratio of 52.8 g per 100 g.

-Example 18-Except that glucose was added to the gelatin solution A described above, concentrated Unshu mandarin orange juice (manufactured by Hiroshima Corp.) was added so that the ratio of sugars was as shown in Table 1. Three
A gelatin film was obtained in the same manner as in.

The concentrated Unshu mandarin orange juice used here is 47.1 g per 100 g.
It contained sugar in the ratio of.

-Example 19-A gelatin film was obtained in the same manner as in Examples 1 to 3 except that honey was added to the above-mentioned gelatin solution A at a ratio of sugar shown in Table 1 instead of adding glucose.

The honey used here contained sugar at a rate of 80 g per 100 g. The composition of this sugar was 50% fructose, 40% glucose, several% sucrose, and a small amount of maltose.

-Comparative Example 1-Gelatin solution A was applied to the same acrylic plate used in the examples.
Was applied to have a thickness of 200 μm, which was cooled under the same conditions as in Example 1 and dried to obtain a film consisting of gelatin only.

-Comparative Examples 2 to 4-Examples 1 to 3 except that instead of adding glucose to the gelatin solution A, Wako Pure Chemical Industries, Ltd. reagent first-grade sorbitol was added at the ratio shown in Table 1. A gelatin film was obtained in the same manner.

Comparative Examples 5 to 7 Examples 1 to 3 except that instead of adding glucose to the gelatin solution A, Wako Pure Chemical Industries, Ltd. reagent grade 1 glycerin was added at the ratio shown in Table 1. A gelatin film was obtained in the same manner.

The thickness of each gelatin film of the above Examples and Comparative Examples,
The moisture permeability and the tensile strength are investigated, and those results are
Shown in the table.

The water vapor transmission rate was examined as follows according to JIS Z0208 (1976). Approximately 5 g of calcium chloride (dihydrate) was put into a plastic petri dish having an inner diameter of 53 mm, and each film whose thickness was measured was adhered to the upper edge of the petri dish with an adhesive to form a lid. The excess portion of each film was cut off, the petri dish was weighed and stored in a thermo-hygrostat (40 ° C., 60% RH) for 24 hours. After storage, the petri dish was weighed to determine the increase in weight. The amount of increase in weight per 1 m ² was converted from the opening area of the petri dish, and this is shown in Table 1 as moisture permeability [gH ₂ O / m ² · 24 hrs.].

The tensile strength was examined as follows. JIS for each film
It was cut into a dumbbell shape specified in Z1702 (1986) to obtain a test piece. Place each test piece in a thermo-hygrostat at 20 ℃ and 60% RH.
Humidified for 24 hours. Remove each humidity-controlled test piece from the thermo-hygrostat and quickly measure the thickness and width of the point where the cross-sectional area (thickness x width) becomes the minimum value, then use a rheometer (NRM-2002D, Fudo Kogyo Co., Ltd.). The maximum load until the test piece was broken by applying a tensile load was calculated, and the tensile strength was calculated by the following formula, and shown in Table 1. When finding the maximum load, use the adapter for tensile strength and set the gap between the upper and lower grips of the test piece.
The test piece was set to 60 ± 5 mm, the test piece was attached so that the center of the test piece was located at the center, and a tensile load was applied at a test speed of 60 mm / min.

As shown in Table 1, each gelatin film of the examples is
It can be seen that the water vapor permeability is lower than that of the film of Comparative Example 1 made only of gelatin, and the tensile strength is higher than that of the film of Comparative Example 1 depending on the added amount of sugar. It can be seen that the films of Examples have high tensile strengths when the water vapor transmission rates are the same as those of the films of Comparative Examples 2 to 7 using the water vapor transmission rate improver other than sugar. In addition, when the addition ratio of the moisture permeability improving agent increases as a whole, the moisture permeability decreases,
Physical strength is reduced.

Since the tensile strength is per unit area of the cross section of the gelatin film, it is hardly affected by the thickness of the film.

〔The invention's effect〕

The gelatin film of the present invention is a gelatin film used for a packaging material, which comprises gelatin, glucose,
Since it comprises a film-like dried product containing at least one moisture permeability improving agent selected from the group consisting of maltose, fructose, a mixture of linear oligosaccharides, a mixture of branched oligosaccharides, fruit juice, honey, and mirin, Very low,
Moreover, it has excellent tensile strength and is useful as a packaging material.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takuichi Miyake 2-17-32 Kusuniba Asahi, Hirakata-shi, Osaka (72) Inventor Kiyotaka Yamane 109-181 Wakai, Hiragan-cho, Ikoma-gun, Nara (56) References 56-64997 (JP, A) JP-A 61-19461 (JP, A) Akio Toyama "Handbook of Natural Products for Food Processing (7th Edition)" Food & Science Co., Ltd. (53.8.31) P. 325

Claims (1)

[Claims] 1. A gelatin film used as a packaging material, which is selected from the group consisting of gelatin, glucose, maltose, fructose, a mixture of linear oligosaccharides, a mixture of branched oligosaccharides, fruit juice, honey, and mirin. A gelatin film comprising a film-like dried product containing one type of moisture permeability improving agent.