JPH01277455A - Gelatin film - Google Patents

Abstract

PURPOSE:To provide a gelatin film, having low moisture permeability, high physical strength and suitable as a packaging material for powdery seasoning, powdery bathing agent, etc., by adding a saccharide as a moisture permeability improver to gelatin and forming a film. CONSTITUTION:Gelatin and saccharides are mixed in a solution state. Glucose, fructose, maltose, honey, etc., are used as the saccharides. A gelatin film is produced by a method for applying the resultant mixture to a mold, roll, etc., cooling and drying the applied solution to form a film, peeling the formed film, etc. The obtained gelatin film has lower moisture permeability than that of a film consisting only of gelatin with hardly any deterioration in physical strength even without using a reinforcing material. Since the gelatin is soluble, a package prepared by packaging with the afore-mentioned gelatin film can be used without breaking the film.

Description

[Detailed description of the invention] [Industrial application field] This invention relates to gelatin films.

[Conventional technology]

Since gelatin forms a strong film, using a film made of gelatin as a packaging material has the potential to expand new uses for gelatin. Moreover, gelatin film is soluble in hot water and edible, so when used for packaging various seasonings, condiments, medicines, etc.
It becomes possible to use or eat the product as it is without removing or tearing the film to remove the contents.

On the other hand, it is known that adding sorbitol or glycerin to a gelatin film changes the film's water vapor permeability (moisture permeability) (Tadao Ida, Shoji Takahashi et al., "Pharmacy" Vol. 28) No. 3, pp. 209-213, 1968).

[Problem to be solved by the invention]

Films made only of gelatin have the problem of high moisture permeability, so when packaging highly hygroscopic items,
Depending on storage conditions, the contents may become damp or deteriorate.

On the other hand, based on the knowledge described in the above-mentioned literature, it has been considered to form a film by adding sorbitol or glycerin to gelatin to obtain a gelatin film with low moisture permeability. However, the inventors' research has shown that such films are made by adding sorbitol and glycerin.
It has been found that the physical strength tends to be significantly lower than that of a film made only of gelatin.

In view of the above, an object of the present invention is to provide a gelatin film with reduced physical strength and reduced moisture permeability.

[Means to solve the problem]

In order to solve the above problems, in the gelatin film according to the present invention, sugar is added to gelatin as a moisture permeability improver.

[For production]

By using sugar as a moisture permeability improving agent, it is possible to reduce the decrease in physical strength of the gelatin film and lower the moisture permeability.

〔Example〕

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

Examples of sugars used as moisture permeability improvers include monosaccharides and oligosaccharides, each of which may be used singly or in combination.
A mixture of the above can be used.

For example, the effect of reducing moisture permeability tends to be greater for monosaccharides than for oligosaccharides.

On the other hand, the decrease in physical strength tends to be smaller for oligosaccharides than for monosaccharides, for example. It is preferable to take these trends into consideration and appropriately select the type of sugar to be added depending on the use of the seratin film.

The proportion of the moisture permeability improver added to the gelatin is not particularly limited, but it is preferably 5 to 40% by weight of the moisture permeability improver to the seratin. If this range is exceeded, the physical strength of the film may decrease too much.
If it is below this range, the moisture permeability may decrease too little.

Sugar may be added to gelatin by adding the sugar itself to gelatin, or by adding a substance containing sugar to gelatin. The sugar-containing substance is not particularly limited, but includes, for example, fruit juice, honey, mirin, and the like.

In the gelatin film of the present invention, non-diabetic compounds may be added to the gelatin, as long as they do not impede the achievement of the objects of the present invention. For example, organic acids such as citric acid,
Compounds contained in fruit juice such as proteins, lipids, vitamins, and inorganic substances, fragrances, pigments, and the like may be added.

The method for producing the gelatin film of this invention is not particularly limited. For example, a method can be used in which seratin and sugar are mixed in a solution state, the mixed solution is applied to a mold or roll, cooled and dried to form a film, and this film is peeled off to obtain a gelatin film. . The mixed solution can be applied by, for example, a casting method using a doctor knife or an air knife, a gravure coating method, a dip coating method, etc., but is not limited thereto. The thickness of the gelatin film can be adjusted, for example, by varying the coating thickness of the mixed solution. Alternatively, after forming a film, the mixed solution is further applied on top of the film to form a film, and this process is repeated one or more times to obtain a gelatin film of a desired thickness.

In addition, from the viewpoint of preventing deterioration of the physical properties of the gelatin film, it is preferable that the above mixed solution has a pH of 2 to 9. If the pH of the mixed solution is less than 2, the physical properties of gelatin will be severely degraded, and the quality of the film itself may also be degraded. If the pH of the mixed solution is greater than 9, quality deterioration and browning may occur.

The ceratin film of the present invention can be used to wrap various things, for example, as a film or by being formed into a bag or container.

Its usage form is not particularly limited. The contents are not particularly limited, but examples thereof include powdered seasonings, powdered bath preparations, oily seasonings, and oily drugs. Since the gelatin film of this invention can be heat-sealed, there is no need to use an adhesive if it is heat-sealed when used for packaging.

When not heat-sealing, an adhesive may be used.

Furthermore, since the gelatin film of the present invention can be printed on its surface, contents can be displayed or designs can be drawn by printing.

The gelatin film of the present invention has lower moisture permeability than a soluble film made only of gelatin, and there is almost no decrease in physical strength even without the use of reinforcing materials. Therefore, when the gelatin of the present invention is used for packaging, it becomes unnecessary to cover the outside with a plastic film or the like, and moreover, the strength as a packaging material can be ensured. Furthermore, since the seratin of this invention is soluble, products packaged with this film can be used without tearing or peeling off the film.

Although specific examples are shown below along with comparative examples, the present invention is not limited to the following examples.

Examples 1 to 3 - Alkali-treated raw bone gelatin (viscosity 33 mP, celery strength 310 bloom, pH 5.5) was dissolved in warm water and
A wt % Seratin solution A was obtained.

To this gelatin solution A, glucose was added as a moisture permeability improver in the ratio shown in Table 1 to gelatin, and the mixture was dissolved and mixed.

After sufficiently defoaming this mixed solution, use a TLC electric applicator (H-3035/Sogo Rikagaku Glass Manufacturing Co., Ltd.).
was applied to a 200 μm thick acrylic plate measuring 200 mm x 200 dragon x 6 fins, and cooled at 10° C. for 20 minutes to form a film.

Thereafter, it was dried with ventilation for 2 hours at 25° C. and 160% RH and peeled off from the acrylic plate to obtain a gelatin film.

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

Examples 4 to 6 - Examples 1 to 6 except that fructose was used in place of glucose in the proportion shown in Table 1 as the moisture permeability improver.
A gelatin film was prepared in the same manner as in Step 3.

Note that the fructose used here had the sweetness shown in Table 2.

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

The maltose used here had a sweetness level shown in Table 2.

Examples 10 to 12 - Gelatin films were obtained in the same manner as Examples 1 to 3, except that a linear oligosaccharide mixture was used in place of glucose in the proportions shown in Table 1 as the moisture permeability improver. .

The linear oligosaccharide mixture used here was manufactured by Nikken Chemical Co., Ltd. under the trade name "Oligo 1--su" and had the composition and sweetness shown in Table 2.

Examples 13 to 15 - Gelatin films were obtained in the same manner as in Examples 1 to 3, except that a branched oligosaccharide mixture was used in place of glucose in the proportions shown in Table 1 as the moisture permeability improver.

The branched oligosaccharide mixture used here was a trade name rlsOJ (branched oligosaccharide mixture) manufactured by Nippon Shiso Kogyo ■ and had the composition shown in Table 3.

Example 16 - Same as Examples 1 to 3 except that instead of adding glucose to the gelatin solution, concentrated apple juice (manufactured by Alps Foods ■) was added to the sugar ratio shown in Table 1. A gelatin film was obtained.

The concentrated apple juice used here was 50% per 100g.
It contained sugar in the proportion of 7 g.

Example 17 - Same as Examples 1 to 3 except that instead of adding glucose to the gelatin solution A, concentrated grape juice (manufactured by Alps Foods ■) was added to the sugar ratio shown in Table 1. A gelatin film was obtained.

The concentrated grape juice used here was 52% per 100g.
．． Contains sugar at a rate of 8 g.

Example 18 - Examples 1 to 3 except that instead of adding glucose to the gelatin solution A, concentrated Unshu mandarin juice (manufactured by Hiroshima Co-op) was added to the sugar ratio shown in Table 1. A gelatin film was obtained in the same manner.

The concentrated Unshu mandarin juice used here was 4
It contained sugar at a rate of 7.1 g.

Example 19 - A gelatin film was obtained in the same manner as in Examples 1 to 3, except that instead of adding glucose to the gelatin/8 solution A, honey was added to the sugar ratio shown in Table 1. Ta.

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

Comparative Example 1 Gelatin solution A was placed on the same acrylic plate as used in Example 1.
was applied to a thickness of 200 μm, and this was applied as Example 1
It was cooled and dried under the same conditions as above to obtain a film consisting only of gelatin.

- Comparative Examples 2 to 4 - Instead of adding glucose to the gelatin/8 solution A,
Gelatin films were prepared in the same manner as in Examples 1 to 3, except that reagent grade 1 sorbitol manufactured by Wako Pure Chemical Industries, Ltd. was added in the proportions shown in Table 1.

- Comparative Examples 5 to 7 - Examples 1 to 3 except that instead of adding glucose to the above Seratin/8/&A, glycerin grade 1 reagent manufactured by Wako Pure Chemical Industries, Ltd. was added in the proportion shown in Table 1. A gelatin film was obtained in the same manner.

The thickness of each gelatin film in the above examples and comparative examples,
Check the moisture permeability and tensile strength, and use those results as the first
Shown in the table.

Moisture permeability was investigated in accordance with JIS Z0208 (1976) as follows. Approximately 5 g of calcium chloride (trihydrate) was placed in a plastic Petri dish with an inner diameter of 53++ m, and each film whose thickness was measured was adhered to the upper edge of the Petri dish with an adhesive to form a lid. Cut off the excess portion of each film, measure the weight of the petri dish, and place it in a constant temperature and humidity chamber (40°C).
160% RH) for 24 hours. After storage, the petri dish was weighed to determine the increase in weight. The opening area of the petri dish was converted into a weight increase per 1 m', and this is shown in Table 1 as moisture permeability [g - tl, o/% 24 hrs,].

The tensile strength was examined as follows. JI each film
It was cut into a Danher shape as specified in S Z1702 (1986) and used as a test piece. Each test piece was heated at 20°C and 60% R.
The humidity was controlled for 24 hours in a constant temperature and humidity chamber. After taking out each humidity-controlled test piece from the constant temperature and humidity chamber and quickly measuring the thickness and width at the point where the cross-sectional area (thickness x width) is the minimum value, the tensile load was applied using a rheometer (Fudou Kogyo @ NRM-2002D). was added to determine the maximum load until the test piece broke, and the tensile strength was calculated using the following formula, which is shown in Table 1. When determining the maximum load, use a tensile strength adapter, set the distance between the upper and lower grips of the test piece to 60 ± 5 fins, attach the test piece so that the center of the test piece is located in the center, and set the test speed to 6.
A tensile load was applied at a rate of 0.01 cm/min.

Table 2 *Sweetness level is the value when sugar is set as 100.

Table 3 As shown in Table 1, each gelatin film of the example had the following properties:
It can be seen that the overall moisture permeability is lower than that of the film made only of gelatin of Comparative Example 1, and the tensile strength is stronger than that of the film of Comparative Example 1, depending on the amount of sugar added. It can be seen that the films of Examples have higher tensile strength when compared with the films of Comparative Examples 2 to 7 using non-diabetic moisture permeability improvers at the same level of moisture permeability. In addition, as the overall addition ratio of moisture permeability improver increases, moisture permeability decreases and
Physical strength is reduced.

Note that 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.

〔Effect of the invention〕

Since the gelatin film of this invention uses sugar as a moisture permeability improving agent, it has lower moisture permeability than a film made only of gelatin, and has greater physical strength than conventional moisture permeability improving gelatin films. There is.

Agent: Patent Attorney Takehiko Matsumoto

Claims (1)

[Claims] 1 A gelatin film made by adding sugar to gelatin as a moisture permeability improver.