JPS61115862A - Vessel having deoxidizing function - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to containers, and more specifically, the present invention relates to containers, and more particularly, to containers containing oxygen-sensitive items such as food and drinks, which contain oxygen in the head space of the container, or the content thereof. This invention relates to a container that prevents the contents from deteriorating due to oxygen dissolved in the container.

[Conventional technology]

Conventionally, nitrogen gas, Alternatively, you can blow an inert gas such as carbon dioxide into the headspace to replace it, or, as with carbonated drinks such as beer, shock the contents and make the carbon dioxide in the beer foam. Various methods are used, such as expelling and replacing air, using antioxidants, oxygen absorbers, and vacuum packaging.

[Problem that the invention seeks to solve]

Air in the headspace inside the container or oxygen dissolved in the contents reacts (oxidizes) with the contents, causing them to deteriorate and deteriorate.
to transform. Therefore, in order to prevent this oxidation, it is necessary to reduce the oxygen in the container as much as possible.

However, with conventional methods, it is difficult to reduce oxygen in the headspace or dissolved oxygen in the contents to zero due to diversification of contents or packaging formats, or speeding up of production, and it is not sufficiently effective. It's hard to say that there is.

[Means for solving problems]

The present inventors completed the present invention by focusing on the property that iron rusts instantly in the presence of oxygen and water.

In other words, oxygen remaining in the container (oxygen in the hent space, oxygen dissolved in the contents) is reacted with iron through water to form hydrated iron oxide, thereby eliminating the effect of oxygen on the contents. In containers for storing items that are sensitive to oxygen, such as food and drink, the entire surface of the container where the contents are stored is coated with a permeable coating, and the gap between this coating and the base material of the container is This is a container having an oxygen scavenging function, which is characterized by forming a gap that contains as little oxygen and moisture as possible, and exposing iron within the gap.

When the base material is iron, iron or non-iron particles are placed on the surface of the container, and gaps are formed between the particles and the permeable coating that covers the surface of the container, or there are holes in the surface of the container. Or, a protrusion is provided to form a gap between the container surface and the permeable coating, or a corrugated permeable coating is coated on the container surface, and the base material is a material other than iron. In some cases, gaps are formed between the iron particles placed on the surface and the permeable coating.

Furthermore, a substance that promotes oxidation is sealed between the container surface and the permeable membrane.

If a recess is to be formed in the base material of the container to form a gap, the minute recess is provided by scratching the surface of the base material of the container. or,
When forming protrusions or gaps in the base material of the container, fine protrusions are formed by placing iron or non-iron fine particles on the surface of the container, or microprotrusions are provided in advance on the surface of the base material.

Further, as the substance that promotes oxidation, there may be used a substance that generates carbon dioxide or the like that is involved in rust, or a substance that contains a metal or the like that itself reacts with oxygen.

Generally, moisture is necessary for iron to rust, but if there is a recess (for example, a scratch) on the surface of the iron, or if there is a gap around it due to dust adhering to it, then Even if the relative humidity is not 100%, moisture condenses (capillary condensation, based on Thomson's law) and rusts easily.

Note that at the stage of manufacturing the container, the inner surface of the container is coated with a thin synthetic resin film, but since there is no moisture between the inner surface of the container and the thin synthetic resin film, rust will not occur even if oxygen reaches there. However, for example, when a beverage is enclosed in the container, sufficient moisture is present in the headspace, so that rust begins to rapidly form and absorb oxygen.

Taking advantage of this phenomenon, oxygen and moisture permeate through a thin layer of synthetic resin that covers the entire surface of the recesses and/or protrusions that are made up of at least a portion of iron, causing the iron to rust, causing the inside of the container to rust. It provides a container that reduces oxygen.

That is, for example, by forming recesses such as scratches on the surface of the base material of the container packaging material on which the contents of the container are stored, or by depositing fine particles, minute recesses and/or minute protrusions are formed. This entire surface is coated with a film that is permeable to oxygen and water vapor so that gaps are created on the surface of the base material, but at that time, it is desirable that each gap is free of oxygen components, so it is necessary to use inert gas. For example, coating is performed under a nitrogen gas atmosphere.

The coating must be made of a material that sufficiently permeates oxygen and moisture, and for this purpose, preferred coating materials include acrylic vinyl acetate, ethylene vinyl acetate, and vinyl acetate.

Furthermore, polyester, epoxy resin, etc. can also be used as the material for the coating.

These materials or thin films thereof may be used alone or in combination of two or more to cover the entire surface on which the minute recesses and/or minute protrusions are formed.

Note that an iron piece whose surface is formed with minute recesses and/or minute protrusions and whose entire surface is covered with a permeable film may be placed in the container.

Furthermore, it is preferable to place the rust in a place where it is hard to see so that the consumer does not feel uncomfortable when looking at the rusted area. For example, in a can container, a micro recess or a convex portion may be provided on the back side of the lid, particularly in the area where the spout is removed, to cause capillary condensation.

Furthermore, even if rust occurs, it is best to cover it with a color that makes the rust less noticeable, for example, brown, to shield the rust.

Containers for storing items that are easily affected by oxygen, such as food and drinks according to the present invention, include containers made of iron as a base material, such as tin cans, tin-free steel cans, tin lids, and crowns. Containers made of substances include aluminum cans, composite cans, aluminum lids, cap backings, plastic composite containers, and the like.

[Effect]

Generally, moisture is necessary for iron to rust, but if there are depressions (for example, scratches) on the iron surface, or if there are gaps around them due to the adhesion of fine particles, the Even if the relative humidity is not 100%, moisture condenses (capillary condensation, based on Thomson's law) and rusts.

Utilizing this phenomenon, the area around the concave and/or convex parts made of at least a portion of iron is rusted by the oxygen and moisture that have passed through the thin synthetic resin coating, thereby reducing the oxygen inside the container. I'm letting you do it.

〔Example〕

Embodiments of the present invention will be specifically described below with reference to Examples. Note that the described embodiments do not limit the present invention.

Example 1 FIG. 1 shows an example of a can container according to the present invention.

FIG. 2 shows an enlarged partial sectional view of a can wall according to the present invention.

1 is a can body, 2 is a side wall, 3 is a coating, and 4 is a recess.

Three cuts were made on the inside wall of a 700 ml tin-free steel can made of iron as a base material, sprayed with ethylene vinyl acetate resin, and filled with beer for 10 days. was measured.

The amount of dissolved oxygen was close to zero.

Example 2 FIG. 3 shows another embodiment of the can container according to the present invention.

FIG. 4 shows an enlarged partial sectional view of the can bottom according to the present invention.
5 is a can body, 6 is a bottom, 7 is a coating, and 8 is a minute object.

In an aluminum can, iron powder particles that passed through 8 meshes and remained in 10.5 meshes for a 350 ml content were attached to the bottom of the can so that the surface area was 105 cd, sprayed with ethylene vinyl acetate resin, and filled with beer. After 10 days, dissolved oxygen in the beer was measured.

The amount of dissolved oxygen was close to zero.

〔Effect of the invention〕

The surface of the container according to the present invention, in which the contents are stored, is coated with a permeable film by forming minute recesses and/or minute protrusions on the surface where the contents are stored, and this coating and the periphery of the recesses and/or protrusions are coated with a permeable film. This process forms voids that do not contain oxygen or moisture, and the iron exposed in the voids reacts with the oxygen in the container to form hydrated iron oxide, reducing the oxygen in the container. The oxygen function prevents the contents from deteriorating and deteriorating due to the influence of oxygen, maintaining the quality of the contents and extending the shelf life.

For those that perform gas replacement to reduce the amount of oxygen in the container, by implementing this invention, the process can be improved, and when used in combination with gas replacement technology, an even greater oxidation prevention effect can be achieved. can be done.

In addition, the use of antioxidants, oxygen absorbers, etc. depends on the contents.
Although there may be some limitations, the present invention does not require the use of antioxidants, oxygen absorbers, etc., and is not limited by the contents, and can be widely used at low cost and safely.

[Brief explanation of drawings]

Fig. 1 Can container according to the present invention Fig. 2 Enlarged partial sectional view of the can wall Fig. 3 Other embodiments of can containers Fig. 4 Enlarged partial sectional view of the can bottom 1.5 Can body 2 Side wall 3.7 Coating 4 Recess 6 Bottom 8 Small object Figure 1 Figure 3 Procedural amendment (voluntary) l. February 6, 1985 1. Display of the case 1988 Patent Application No. 233779 2. Name of the invention Container with oxygen scavenging function 3. Person making the amendment Relationship to the case Patent applicant 1. Suntory Ltd. Patent Office 5. Subject of amendment Full text of the specification
(6. Contents of the amendment As shown in the appendix, the name in the appendix of the description is: Container with oxygen scavenging function. Scope of Claims 1) In a container for storing food and other items that are easily affected by oxygen, the contents of this container. H has an oxygen scavenging function characterized by coating the surface where objects are collected with a permeable coating, forming a gap between the coating and the base material of the product, and exposing an iron layer within the gap. container. 2) The container according to claim 1, wherein the base material is iron. 3) The container according to claim 1, wherein the base material is a substance other than iron, and a gap is formed between the iron particles coated on the surface of the base material and the permeable coating. 4) Two containers according to claim 2, in which iron or particles other than iron are peeled on the inner surface of the container, and a gap is formed between the inner surface of the container and the permeable coating that covers the inner surface of the container. . 5) The container according to claim 2, wherein a recess or protrusion is provided on the inner surface of the container, and a gap is formed between the recess or the protrusion and the permeable coating covering the inner surface of the container. (6) The container according to claim 2, wherein the inner surface of the container is coated with a corrugated transparent coating. (7) The container according to claim 1, characterized in that a substance that promotes oxidation is sealed between the inner surface of the container and the permeable membrane. 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a container, and more specifically, the present invention relates to a container, and more specifically, to a container containing an article susceptible to the influence of oxygen, such as food or drink. This invention relates to a container that prevents the contents from deteriorating due to oxygen dissolved in the container. [Prior Art] Conventionally, methods have been used to prevent the contents of food, drinks, and other articles in sealed packaging containers from deteriorating due to the influence of air in the headspace within the container or oxygen dissolved in the contents. Therefore, the headspace may be replaced by blowing nitrogen gas or an inert gas such as carbon dioxide gas into the headspace, or, as with carbonated drinks such as beer, the content may be shocked to cause the carbon dioxide gas in the beer to foam. Therefore, various methods have been adopted, such as expelling and replacing the air in the head space, using antioxidants, using oxygen absorbers, and vacuum packaging. [Problem to be solved by the invention] The air in the head space of the container or the oxygen dissolved in the contents reacts (oxidizes) with the contents, causing deterioration and deterioration of the contents.
to transform. Therefore, in order to prevent this oxidation, it is necessary to reduce the oxygen in the container as much as possible. However, with conventional methods, it is difficult to reduce oxygen in the headspace or dissolved oxygen in the contents to zero due to diversification of contents or packaging formats, or speeding up of production, and it is not sufficiently effective. It's hard to say that there is. [Means for Solving the Problems] The present inventors completed the present invention by focusing on the property that iron rusts instantly in the presence of oxygen and water. That is, in the present invention, the oxygen remaining in the container (oxygen in the head space, oxygen dissolved in the contents) is reacted with iron through water to form hydrated iron oxide, thereby reducing the effect of oxygen on the contents. Containers for storing items that are easily affected by oxygen, such as food and drinks, are coated with a permeable coating over the entire surface of the container where the contents are stored, and this coating and the base material of the container are This is a container having an oxygen scavenging function, which is characterized by forming a gap that contains as little oxygen and moisture as possible between the two and exposing iron within the gap. When the base material is iron, iron or particles other than iron are placed on the inner surface of the container, and a gap is formed between the particles and the permeable coating that coats the inner surface of the container, or particles other than iron are placed on the inner surface of the container. A recess or protrusion is provided to form a gap between the inner surface of the container and the permeable coating, or a corrugated permeable coating is coated on the inner surface of the container. When the material is a substance other than iron, gaps are formed between the iron particles placed on the surface of the base material and the permeable coating. Furthermore, a substance that promotes oxidation is sealed between the inner surface of the container and the permeable membrane. If a recess is to be formed in the base material of the container to form a gap, the minute recess is provided by scratching the surface of the base material of the container. or,
When forming protrusions or gaps on the base material of the container, place fine particles of iron or non-iron on the surface of the base material of the container to form minute protrusions, or create minute protrusions on the surface of the base material in advance. . Further, as the substance that promotes oxidation, there may be used a substance that generates carbon dioxide or the like associated with mackerel, or a substance that itself contains a metal or the like that reacts with oxygen. Generally, moisture is required for iron to rust.
- However, if there are depressions (e.g. scratches) on the iron surface,
Or, if dirt adheres and there is a gap around it, moisture will condense in that area (capillary condensation, based on Thompson's law) even if the relative humidity is not 100%, making it susceptible to rust. . Note that at the stage of manufacturing the container, the inner surface of the container is coated with a thin synthetic resin film, but since there is no moisture between the inner surface of the container and the thin synthetic resin film, rust will not occur even if oxygen reaches there. However, for example, when a beverage is enclosed in the container, sufficient moisture is present in the headspace, so that rust begins to rapidly form and absorb oxygen. The present invention takes advantage of this phenomenon, and the oxygen and moisture that permeate through a thin layer of synthetic resin covering the entire surface of the concave and/or convex portions made of iron at least partially rust the iron. The present invention provides a container that reduces oxygen within the container. That is, for example, by forming recesses such as scratches on the surface of the base material of the container packaging material on which the contents of the container are stored, or by depositing fine particles, minute recesses and/or minute protrusions are formed. This entire surface is coated with a film that is permeable to oxygen and water vapor so that gaps are created on the surface of the base material, but at that time, it is desirable that each gap is free of oxygen components, so it is necessary to use inert gas. For example, coating is performed under a nitrogen gas atmosphere. The coating must be made of a material that sufficiently permeates oxygen and moisture, and for this purpose, preferred coating materials include acrylic vinyl acetate, ethylene vinyl acetate, vinyl acetate, and silicone resin. Furthermore, polyester, epoxy resin, etc. can also be used as the material for the coating. These materials or thin films thereof may be used alone or in combination of two or more to cover the entire surface of the base material in which minute recesses and/or minute protrusions are formed. Note that an iron piece whose surface is formed with minute recesses and/or minute protrusions and whose entire surface is covered with a permeable film may be placed in the container. Furthermore, it is preferable to place the rust in a place where it is hard to see so that the consumer does not feel uncomfortable when looking at the rusted area. For example, in a can container, a micro recess or a convex portion may be provided on the back side of the lid, particularly in the area where the spout is removed, to cause capillary condensation. Furthermore, even if rust occurs, it is best to cover it with a color that makes the rust less noticeable, for example, brown, to shield the rust. Containers for storing items that are easily affected by oxygen, such as food and drinks according to the present invention, include containers made of iron as a base material, such as tin cans, tin-free steel cans, tin lids, and crowns. Containers made of substances include aluminum cans, composite cans, aluminum lids, cap backings, plastic composite containers, and the like. [Effect] Generally, moisture is necessary for iron to rust, but if there are depressions (for example, scratches) on the iron surface, or if there are gaps around them due to adhesion of fine particles, Even if the relative humidity is not 100% in that area, moisture condenses (
(Based on capillary condensation, Thomson's law), it becomes easier to rust. Utilizing this phenomenon, the area around the concave and/or convex parts made of at least a portion of iron is rusted by the oxygen and moisture that have passed through the thin synthetic resin coating, thereby reducing the oxygen inside the container. I'm letting you do it. [Example] Embodiments of the present invention will be specifically described below with reference to Examples. Note that the described embodiments do not limit the present invention. Embodiment 1.2 will be explained with reference to the attached FIGS. 1 and 2. Example 1 Three cuts (4) were made on the inner wall (2) of a 700 ml tin-free steel can (1) made of iron as a base material, and ethylene vinyl acetate resin was sprayed on the can to form a coating of the same resin ( 3), and after filling with beer and storing it for 10 days, dissolved oxygen in the beer was measured. The amount of dissolved oxygen was close to O. Example 2 A tin-free steel can (1) with a total content of 732 ml made of iron as a base material has a width of approximately 0.
2 mm, approximately 0.17 n+m deep cuts (4)
After spraying silicone resin to a thickness of 5 microns to form a coating (3) and baking it, fill it with 700 ml of water and leave it at 20°C for one day. Total oxygen was measured. The oxygen content was reduced by 30% of the initial oxygen content. Example 3 This will be explained with reference to the attached FIGS. 3 and 4. In an aluminum can (5), iron powder particles (8) which passed through 200 meshes and remained at 250 meshes for a total content of 374 ml were attached to the bottom of the can (6) so that the surface area was 5QcJ, and then a coating was applied on top of the iron powder particles (8). 5 as the thickness of
Spray silicone resin to a micron size to form a silicone resin film (7), and after baking, add 350 ml of water.
ml was filled and left in the apparatus at 20°C for one day, and then the total oxygen inside the can was measured. The oxygen content was reduced by 25% of the initial oxygen content. [Effects of the Invention] The surface of the container according to the present invention in which the contents are stored is coated with a permeable film by forming micro-recesses and/or micro-projections, and this coating and the recesses and/or projections A gap is formed around the container that contains as little oxygen and water as possible, and the iron exposed in the gap reacts with the oxygen in the container to form hydrated iron oxide in the container. The deoxidizing function that reduces oxygen prevents the contents from deteriorating and deteriorating due to the influence of oxygen, maintaining the quality of the contents and extending the shelf life. For those that perform gas replacement to reduce the amount of oxygen in the container, by implementing this invention, the process can be improved, and when used in combination with gas replacement technology, an even greater oxidation prevention effect can be achieved. can be done. In addition, the use of antioxidants, oxygen absorbers, etc. depends on the contents.
Although there may be some limitations, the present invention eliminates the need for the use of antioxidants, oxygen absorbers, etc., and is not limited by the contents (and is inexpensive, safe, and widely available. 4 , Brief Description of the Drawings FIG. 1 Drawing showing a can container of Example 1.2 of the present invention

Claims (1)

[Scope of Claims] (1) In a container for storing items that are easily affected by oxygen, such as food and drinks, the surface of the container where the contents are stored is coated with a permeable coating, and the coating and the surface of the container are coated with a permeable coating. A container (2) having a deoxidizing function, characterized in that a gap is formed between the base material and the iron is exposed in the gap; 3) The container (4) according to claim 1, wherein the base material is a substance other than iron, and a gap is formed between the iron particles placed on the surface of the base material and the permeable coating. A container (5) according to claim 2, in which particles of iron or particles other than iron are placed on the surface of the container, and a gap is formed between the container and the permeable coating that covers the surface of the container. A patent in which a container (6) according to claim 2 is provided with a part or a protrusion and a gap is formed between the container and the permeable film covering the surface of the container. Container (7) according to Claim 2: The container according to Claim 1, characterized in that a substance that promotes oxidation is sealed between the container surface and the permeable membrane.