JPH0620908B2 - Vacuum packaging bag - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention is capable of very easily and easily discriminating abnormalities such as alteration and decay of the contents with the naked eye, and a defective sealing of the packaging bag or a packaging bag. The present invention relates to a vacuum packaging bag that can be discriminated by a naked eye whether or not it is damaged.

(b) Prior Art Recently, with the remarkable development of the food service industry, a large variety of foods have been sold in a vacuum package in large quantities.

In addition, special medicines and the like containing drugs that are altered or decomposed by oxygen in the air are also vacuum-packed.

Vacuum packaging is intended for the long-term safety of contents, but it is believed that the safety is somewhat high,
As a result, accidents such as food poisoning are likely to occur.

Furthermore, even in the case of vacuum packaging, if the bacteria in the atmosphere invade after the packaging or the bacteria invade due to damage to the packaging film itself, etc., due to insufficient sealing in the packaging process. Etc.

When such a situation occurs, the contents are deteriorated and rotted to generate harmful substances, and when eaten or taken, it causes food poisoning, abdominal pain, etc., and loses its medicinal effects. Also, there is a problem in that even if one does not eat or does not take it, it is useless just to purchase.

In general, vacuum-packed contents are safer than alterations and rots that are normally packed, and are safe, and many people think of them like canned foods.

By the way, depending on the degree and type of alteration, there are cases where there is little discoloration or bad odor, and it may not be possible to distinguish them.

Therefore, you can cook without checking the condition of the contents,
It is more likely to be eaten as it is than ordinary packaging.

In addition, recently, food safety standards etc. have been strictly defined by the Food Sanitation Law, and if food poisoning etc. occurs due to the sold product, the seller is not only responsible for sales, but also loses credibility. , Suffer great disadvantages.

Therefore, recently, as a hermetically sealed bag, a part of the inner surface of a transparent thermoplastic plastic outer layer film having an oxygen gas blocking property is provided with a discolored ink print display surface that reversibly changes color in a low oxygen gas concentration range, and the printed surface is It has been proposed that a laminated sheet is formed by laminating an oxygen gas permeable heat-sealable plastic inner layer film on the entire inner surface of a transparent thermoplastic outer layer film containing the same (Actual Development Sho 58.
No. 27179 publication).

By the way, as an ink that is reversibly discolored in the low oxygen gas concentration range printed on the inner surface of this transparent outer layer film, a thiazine-based ink, an indigoid-based dye, a thioindigoid-based dye, a dye selected from among sulfur dyes and a reducing saccharide, A composition in which an alkaline substance is mixed and dissolved or dispersed in a synthetic resin solution, and further, a composition in which glycerin is added and mixed in the composition is used.

(c) Problems to be Solved by the Invention However, this is for judging oxygen gas, and it is not possible to judge substances such as ammonia and carbon dioxide generated by deterioration, spoilage, etc. of food at all. As a result, accidents such as food poisoning are likely to occur, and the same problem as in the above case occurs.

Also, substances such as ammonia and carbon dioxide are generated due to the deterioration and spoilage of food, but these substances are active,
This substance may chemically bond with the components of the ink to lower the oxygen gas determination sensitivity, or it may not be possible to determine the oxygen gas.

In other words, this product has no consideration given to substances such as ammonia and carbon dioxide that are generated due to the deterioration and spoilage of food.

Further, this is a composition in which the ink is a thiazine-based dye, an indigoid-based dye, a thioindigoid-based dye, a dye selected from sulfur dyes, a reducing saccharide, and an alkaline substance are mixed and dissolved or dispersed in a synthetic resin solution. Is a discoloring ink formed by adding and dissolving glycerin to this composition and reversibly discoloring in a low oxygen gas concentration range.However, organic compounds have poor sensitivity and the packaging bag is poorly sealed. However, even if the reducing sugar is oxidized by oxygen in the air and discolors temporarily, if it is overlooked, the ink will reversibly discolor and the original color will change, indicating that the packaging bag is poorly sealed. Problems such as overlooking may occur.

(d) Means for solving the problem The present inventor, as a result of earnest research in view of such a technical situation, carbon dioxide or ammonia is generated when decay or spoilage occurs, while a packaging bag is used. If there is a seal failure or damage to the air, the air will flow in and the oxygen in the air will oxidize the contents. Moreover, by detecting this carbon dioxide, ammonia and oxygen with a specific substance, it can be carried out reliably and quickly. The present invention has been completed, paying attention to the fact that the presence or absence of alteration can be easily determined.

The feature is that the gas detector that packages foods and pharmaceuticals in a vacuum state and discolors or precipitates due to the presence of gas generated by the decay or deterioration of the contents such as foods The point is that it is contained in a state of being partitioned.

That is, the structure is such that the gas detector and the contents are enclosed by the gas permeable film so that they are not in direct contact with each other.

In the present invention, being partitioned by a film means that the gas detector is enclosed in a bag made of a gas-permeable film, and this is enclosed in a vacuum packaging bag, or a pocket is provided in the vacuum packaging bag. It suffices if the structure is such that the gas detector is provided and enclosed therein, that is, the gas detector is in direct contact with the gas generated due to the decomposition or deterioration of the contents, and not directly in contact with the contents.

The term "gas permeable film" as used herein means a film having a property of having high gas permeability, and examples thereof include polyethylene film, polypropylene film, acetate film, polyvinyl chloride film, polystyrene film, polycarbonate film, chlorinated rubber film and the like. Alternatively, these films can be listed physically, for example, a film having micropores formed by a method such as electron beam irradiation, and further, a film having micropores formed in the step of forming the film, but the film is not limited to these films. What is important is that the film is permeable to gas but impermeable to water.

In addition, as a method of visual identification, change of color of solution or paper,
It is a concept including that the change can be identified by the occurrence of precipitation, suspension, emulsification and the like.

The gases to be detected in the present invention are carbon dioxide and ammonia. The reason is that the gas generated due to alteration or decay is carbon dioxide and / or ammonia, and normality or abnormality can be discriminated by detecting these gases.

As the gas detector, when the gas to be detected is carbon dioxide, an aqueous calcium chloride solution, an aqueous calcium hydroxide solution, an aqueous barium hydroxide solution, phenolphthalein, or the like can be used. Due to the presence of carbon dioxide, these aqueous solutions become cloudy or change from red or pink to colorless or white.

Further, when the gas to be detected is ammonia, the Nessler reagent is preferable, but the gas is not limited to this, and any substance that changes color due to the presence of ammonia may be used.

These detected substances may be used alone or in combination of two or more. As a method of combining a plurality of these substances, a plurality of detection substances may be mixed and used, or alternatively, they may be separately partitioned and enclosed.

Further, the gas detector is not limited to the aqueous solution or the suspension, and paper impregnated with the gas detector may be used.

In the present invention, a packaging bag for packaging foods and pharmaceuticals in a vacuum state, a gas detector that discolors or precipitates due to the presence of oxygen in the air, is encapsulated in a state separated from the contents by a gas permeable film. It is also useful that the gas detection material of the gas detection body uses manganese hydroxide.

That is, in a vacuum packaging bag, if the seal is insufficient or the bag is damaged during handling, air will flow in, but by utilizing the oxidation reaction by oxygen in the air, manganese hydroxide Since the suspension (white) changes color to dark brown, the abnormality of the packaging bag can be easily discerned with the naked eye.

Moreover, this oxidation reaction immediately occurs due to the presence of oxygen,
Moreover, it does not change after that, so there is no oversight.

(d) Action As described above, according to the present invention, when carbon dioxide or ammonia is generated due to putrefaction or spoilage of food or the like, the gas detector is discolored or precipitated, whereby it can be very easily distinguished from the outside with the naked eye. .

Further, in the present invention, since manganese hydroxide is used as the oxygen gas detection product, in the vacuum packaging bag, if the seal is insufficient or the bag is damaged during handling, the Due to the oxidation reaction by oxygen, the suspension of manganese hydroxide (white) changes its color to dark brown, which allows the abnormality of the packaging bag to be discerned very easily with the naked eye.

(f) Example FIG. 1 shows a vacuum packaging bag (1) which is an example of the present invention.
FIG. 2 is a perspective view showing a sausage (2) vacuum-packed by utilizing, and FIG. 2 is a sectional view thereof.

In one corner containing the sausage (2), a gas detector (4) made of polypropylene film (having fine pores) is provided, and the gas detector of this gas detector (4) is calcium chloride. An aqueous solution is used.

Although this propylene film is impermeable to water, it has a large gas permeability due to its fine pores.

According to this example, when the contents are decomposed by microorganisms and carbon dioxide is generated as a result, it does not go out through the outer wall (5) of the packaging, but the propylene film (3) of the gas detector (4). Passes through to reach the calcium chloride aqueous solution in the gas detector (4) and reacts with this calcium chloride to produce insoluble calcium hydroxide, causing the solution to become cloudy.

As a result, it is possible to easily confirm the presence of carbon dioxide from the outside with the naked eye, that is, it is possible to determine that it is rotting.

Although carbon dioxide was described in the above embodiment, ammonia can be applied instead of carbon dioxide, and in this case, the presence or absence of abnormality can be very easily determined by the color change of the Nessler reagent.

Further, instead of the above example, a white emulsion of manganese hydroxide [Mn (OH) ₂ ] is used as a gas detection product of the gas detection body (4), and the presence of oxygen can be confirmed by this, so that a vacuum is obtained. The abnormality of the packaging bag (1) can be identified very easily (color changes to brown due to the presence of oxygen).

This can greatly reduce the risk of accidentally eating a rotten food.

(g) Effect of the Invention As described above, according to the present invention, the presence or absence of alteration of the contents of the vacuum packaging can be discriminated very easily from the outside with the naked eye, and thus the altered food can be used by general consumers. You can avoid the risk of eating and poisoning, while
This is very useful for food and other vendors, because it can avoid the situation where their own products cause poisoning and damage their credibility.

Further, in the present invention, since manganese hydroxide is used as the oxygen gas detection product, in the vacuum packaging bag, if the seal is insufficient or the bag is damaged during handling, the Due to the oxidation reaction by oxygen, the suspension of manganese hydroxide (white) changes color to dark brown, which makes it extremely easy to identify abnormalities in the packaging bag with the naked eye, which is extremely beneficial.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of the present invention, and FIG. 2 is a sectional view of the embodiment shown in FIG. 1 ... vacuum packaging bag 2 ... sausage 3 ... gas permeable film 4 ... gas detector 5 ... packaging outer wall

Claims (8)

[Claims] 1. A gas detector, which packages a food or drug in a vacuum state and discolors or precipitates due to the presence of a gas generated by the decay or deterioration of the content such as the food, is separated from the content by a gas permeable film. A vacuum packaging bag characterized in that it is contained in a sealed state. 2. The vacuum packaging bag according to claim 1, wherein the gas detector is an aqueous solution of a gas detector. 3. The vacuum packaging bag according to claim 1, wherein the gas detector is a test paper impregnated with a gas detector. 4. The vacuum packaging bag according to claim 1 or 2, wherein the gas is carbon dioxide. 5. The vacuum packaging bag according to claim 4, wherein the gas detection product is calcium chloride. 6. The vacuum packaging bag according to any one of claims 1 to 3, wherein the gas is ammonia. 7. The reagent packaging bag according to claim 6, wherein the gas detection substance is a Nessler reagent. 8. A packaging bag for packaging foods and pharmaceuticals in a vacuum state, in which a gas detector that is discolored or precipitated due to the presence of oxygen in the air is enclosed in a state of being separated from the contents by a gas permeable film. And a gas detection product of the gas detection body is manganese hydroxide.