KR102464041B1 - food storage vessel and manufacturing method thereof - Google Patents

Abstract

Disclosed are a food storage container capable of being directly heated but not leaching harmful substances to ensure safety, and a method for manufacturing the same. According to an embodiment of the present invention, a food storage container comprises: a metal layer; and a protective film attached to inner and outer surfaces of the metal layer, respectively. The protective film includes: a barrier layer; and an adhesion layer bonded to the barrier layer and attached to the metal layer.

Description

Food storage vessel and manufacturing method thereof

The present invention relates to a food storage container and a method for manufacturing the same, and more particularly, to a food storage container and a method for manufacturing the same, which can be directly heated and can ensure safety because substances harmful to the human body are not eluted.

Due to changes in lifestyle, the increase in single-person households, and the spread of the coronavirus (COVID-19), the demand for delivery food, instant food, and stored food is increasing explosively.

Delivery food, instant food, stored food, etc. have an inner space in which the food is contained and are placed in an open container, and the upper part of the open container is sealed with a cover part for storage and distribution.

In general, food containers are manufactured by molding plastic, or by molding metal plates such as steel plate, tin-plated steel plate, chrome-plated steel plate, and aluminum steel plate. In addition, food containers manufactured by molding a metal plate are coated with an organic solvent-type paint or synthetic resin film on the inner surface of the food container to ensure safety so that they do not come into direct contact with the food contained therein.

When ingesting food, the cover part is removed and the food contained in the food container is directly ingested, or the food contained in the food container is heated or cooked to ingest.

In this case, the food contained in the food container is frequently heated using a direct fire or a microwave oven. Conventional food containers made of plastic materials cannot be directly heated, and even in the process of heating using a microwave oven, it is harmful to the human body. There was a problem in that substances such as harmful bisphenol A were eluted.

In addition, in food containers manufactured by molding metal plates, substances such as bisphenol A, which are harmful to the human body, are frequently eluted in the process of heating them using a direct fire or microwave oven, etc. Alternatively, the process of coating the synthetic resin film is complicated, and there is a problem in that economic efficiency is lowered.

Republic of Korea Patent Publication No. 10-2011-0111221 (published on October 10, 2011)

The present invention has been devised in view of the above-described points, and an object of the present invention is to provide a food storage container that can be directly heated while ensuring safety because harmful substances are not eluted, and a method for manufacturing the same.

Another object of the present invention is to provide a method capable of manufacturing a food container in a simple and economical way compared to the prior art and a food container manufactured therefrom.

Objects of the present invention are not limited to those described above, and other objects not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, the present invention provides a food storage container and a method for manufacturing the same, wherein the food storage container according to an aspect of the present invention has an internal space for accommodating food and is a food storage container having an open top. As such, the food storage container consists of a metal layer and a protective film attached to the inner and outer surfaces of the metal layer, respectively, and the protective film includes a blocking layer and an adhesive layer coupled to the blocking layer and attached to the metal layer. .

The metal layer may be selected from the group consisting of iron, aluminum, chrome-plated steel, and tin-plated steel.

The barrier layer is silicon dioxide (SiO ₂ ), titanium dioxide (TiO ₂ ), calcium carbonate (based on 100 parts by weight of PET resin modified using 1,4-cyclohexane dimethanol) CaCO ₃ ) and 1 to 20 weight % of inorganic particles selected from the group consisting of 1 to 5 parts by weight of a blended PET resin and 2 to 10 parts by weight of a PET resin modified using isophthalic acid. is done by

The adhesion layer uses 1,4-cyclohexane dimethanol (1,4-Cyclohexane Dimethanol), 1,3-propanediol (1,3-propanediol) and 1,4-butanediol (1,4-Butanediol) at the same time Based on 100 parts by weight of the modified PET (Polyethylene terephthalate) resin, 10 to 50 parts by weight of the PET resin modified with isophthalic acid is included.

In addition, the method for manufacturing a food storage container according to an aspect of the present invention comprises the steps of: preparing a protective film having a metal plate, a blocking layer, and an adhesive layer coupled to the blocking layer and attached to the metal plate; positioning the protective film on one surface and the other surface of the metal plate, respectively; attaching the adhesive layers of the protective film to both surfaces of the metal plate by applying heat and pressure; and forming a container having an internal space in which the food is accommodated and having an open top.

The metal plate may be selected from the group consisting of a steel plate, an aluminum plate, a chrome-plated steel plate, and a tin-plated steel plate.

The barrier layer is silicon dioxide (SiO ₂ ), titanium dioxide (TiO ₂ ), calcium carbonate (based on 100 parts by weight of PET resin modified using 1,4-cyclohexane dimethanol) CaCO ₃ ) and 1 to 20 weight % of inorganic particles selected from the group consisting of 1 to 5 parts by weight of a blended PET resin and 2 to 10 parts by weight of a PET resin modified using isophthalic acid. is done by

The adhesion layer uses 1,4-cyclohexane dimethanol (1,4-Cyclohexane Dimethanol), 1,3-propanediol (1,3-propanediol) and 1,4-butanediol (1,4-Butanediol) at the same time Based on 100 parts by weight of the modified PET (Polyethylene terephthalate) resin, 10 to 50 parts by weight of the PET resin modified with isophthalic acid is included.

According to the present invention as described above, it is possible to obtain a food storage container that can be directly heated and can secure safety because harmful substances are not eluted.

In addition, according to the present invention, there is an advantage that a food storage container can be manufactured simply and economically compared to the prior art.

Objects of the present invention are not limited to those described above, and other objects not mentioned will be clearly understood by those skilled in the art from the following description.

1 is a view for explaining the structure of a food storage container according to an embodiment of the present invention.
2 is a photograph showing a state in which a food storage container manufactured according to an embodiment of the present invention is directly heated.
3 is a photograph showing the bottom surface bonded directly to the fire after directly heating the food storage container manufactured according to the embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those of ordinary skill in the art to which the present invention pertains can easily implement them. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

In describing the present invention, the size or shape of the components shown in the drawings may be exaggerated or simplified for clarity and convenience of explanation.

In addition, terms specifically defined in consideration of the configuration and operation of the present invention may vary depending on the intention or custom of the user or operator. These terms should be interpreted as meanings and concepts consistent with the technical spirit of the present invention based on the contents throughout this specification.

In order to clearly explain the present invention, the description of parts not related to the technical idea of the present invention is omitted, and the same reference numerals are given to the same or similar elements throughout the specification.

Throughout the specification, when a part "includes" a certain component, it may mean that other components are further included, rather than excluding other components, unless otherwise stated.

The inventors of the present invention blended PET (Polyethylene terephthalate) resin modified with various substances in the process of researching on a food storage container that can be directly heated and safe because substances harmful to the human body are not eluted, and A protective film is manufactured with a two-layer structure by coextrusion of these, and the protective film manufactured by applying heat and pressure is attached to the metal and then the food storage container is molded, and the manufactured food storage container can be directly heated The present invention was completed by confirming that substances harmful to the human body are not eluted.

Hereinafter, the present invention will be described in detail.

As shown in FIG. 1 , the food storage container 100 according to an embodiment of the present invention has an internal space 130 for accommodating food and has an open top, a metal layer 110 and the metal layer 110 . ) consists of a protective film 120 coupled to the inner and outer surfaces, respectively.

The protective film 120 is composed of a blocking layer 121 and an adhesive layer 122 coupled to the blocking layer 121 and attached to the metal layer 110 , and is manufactured by a coextrusion method.

The metal layer 110 may be selected from the group consisting of iron, aluminum, chrome-plated steel, and tin-plated steel. However, the metal layer 110 may be made of a material other than those exemplified above, and the type of the metal layer 110 is not limited to the present invention.

The blocking layer 121 is provided to block contact between the food contained in the inner space 130 and the external environment and the metal layer 110 .

The blocking layer 121 is silicon dioxide (SiO ₂ ), titanium dioxide (TiO ₂ ), based on 100 parts by weight of PET resin modified using 1,4-cyclohexane dimethanol (1,4-Cyclohexane Dimethanol), 1 to 5 parts by weight of a PET resin blended with 1 to 20% by weight of inorganic particles selected from the group consisting of calcium carbonate (CaCO ₃ ) and mixtures thereof and 2 to 10 of PET resin modified with isophthalic acid including parts by weight.

The components and their ratios of the blocking layer 121 as described above are optimal values obtained after countless repeated experiments in the process of completing the present invention. ) can block the contact of the metal layer 110 with the food contained in the food and the external environment, and can be firmly coupled to the adhesion layer 122 .

The adhesion layer 122 is provided to firmly and easily attach the protective film 120 to the metal layer 110 by heat and pressure.

The adhesion layer 122 is 1,4-cyclohexane dimethanol (1,4-Cyclohexane Dimethanol), 1,3-propanediol (1,3-propanediol), and 1,4-butanediol (1,4-Butanediol) 10 to 50 parts by weight of the PET resin modified by using isophthalic acid with respect to 100 parts by weight of the polyethylene terephthalate (PET) resin modified by using at the same time.

The components and component ratios of the adhesive layer 122 as described above are optimal values obtained after countless repeated experiments in the process of completing the present invention. ) is firmly coupled to the blocking layer 121, and when heat and pressure are applied, it can be firmly and easily attached to the metal layer.

In this case, a thickness ratio of the blocking layer 121 and the adhesion layer 122 may be 50:50 to 80:20. However, the blocking layer 121 and the adhesion layer 122 may have various thickness ratios other than the above-described thickness ratio, and the above-described thickness ratio does not limit the present invention.

In addition, each of the resin constituting the barrier layer 121 and the adhesive layer 122 constituting the protective film 120 according to the present invention may further contain various additives used in the manufacture of a conventional PET film, which are those of ordinary skill in the art. Since it is self-evident, detailed description will be omitted.

The food storage container 100 according to an embodiment of the present invention as described above has an internal space 130 in which food is accommodated and has an open top.

Food is accommodated in the inner space 130 of the food storage container 100, and after the food is placed in the inner space 130, a cover film, EOE (easy open end), SOT EOE (stay on tab easy open end), etc. It is sealed by the same cover part. Sealing the food storage container containing food with the cover part is obvious to those skilled in the art, and thus a detailed description thereof will be omitted.

Hereinafter, a method for manufacturing the food storage container 100 according to an embodiment of the present invention will be described.

A method for manufacturing a food storage container according to an embodiment of the present invention includes a metal plate, a protective film 120 having a blocking layer 121 and an adhesive layer 122 coupled to the blocking layer 121 and attached to the metal plate. to prepare; positioning the protective film 120 on one surface and the other surface of the metal plate, respectively; attaching the adhesive layers 122 of the protective film 120 to both sides of the metal plate by applying heat and pressure; and forming a container having an internal space in which the food is accommodated and having an open top.

In this embodiment, the metal plate is an element corresponding to the metal layer described above. That is, in the method of manufacturing a food storage container according to this embodiment, the protective film 120 is attached to both sides of a metal plate by heat and pressure, and then, it is molded into a desired container shape, so that it is very simple and easy to store food compared to the prior art. Containers can be manufactured.

The manufacturing of the food storage container according to the present embodiment may be performed in a continuous process or may be performed in a batch type.

In the step of attaching the protective film to both sides of the metal plate by applying heat and pressure, the application of heat may be performed by a heating means, and the attachment of the foam film to both sides of the metal plate by applying pressure may be performed by a pair of pressure rollers. have.

The metal plate may be selected from the group consisting of a steel plate, an aluminum plate, a chrome-plated steel plate, and a tin-plated steel plate. However, as the metal plate, a metal plate of a material other than that illustrated above may be used, and the type of the metal plate is not limited to the present invention.

The barrier layer is silicon dioxide (SiO ₂ ), titanium dioxide (TiO ₂ ), calcium carbonate (based on 100 parts by weight of PET resin modified using 1,4-cyclohexane dimethanol) CaCO ₃ ) and 1 to 20 weight % of inorganic particles selected from the group consisting of 1 to 5 parts by weight of a blended PET resin and 2 to 10 parts by weight of a PET resin modified using isophthalic acid. is done by

The adhesion layer uses 1,4-cyclohexane dimethanol (1,4-Cyclohexane Dimethanol), 1,3-propanediol (1,3-propanediol) and 1,4-butanediol (1,4-Butanediol) at the same time Based on 100 parts by weight of the modified PET (Polyethylene terephthalate) resin, 10 to 50 parts by weight of the PET resin modified with isophthalic acid is included.

The metal plate to which the protective film 120 is attached on both sides has an inner space 130 for accommodating food thereafter and is formed in an open top form. Since the molding of the container in the above shape may be performed by a known method such as press working, a detailed description thereof will be omitted.

The food storage container 100 manufactured according to an embodiment of the present invention as described above has an internal space 130 in which food is accommodated, and has an open top.

After the step of putting food in the inner space 130 of the food storage container 100, and the food storage container 100 containing the food in the inner space 130, a cover film, EOE (easy open end), SOT EOE (stay) on tab easy open end), and the like, may further include sealing by a cover part.

Hereinafter, the present invention will be described in more detail by way of Examples and Test Examples.

Example : Manufacturing of food storage containers

First, a stretched coextruded PET film having a two-layer structure of a barrier layer and an adhesive layer was prepared for use as a protective film.

As the resin of the barrier layer, PET resin modified using 1,4-cyclohexane dimethanol and silicon dioxide (SiO ₂ ) 10% by weight are blended and isophthalic acid (Isophthalic acid) ), the modified PET resin was used in a ratio of 100:3:5.

As the resin of the adhesion layer, 1,4-cyclohexane dimethanol (1,4-Cyclohexane Dimethanol), 1,3-propanediol (1,3-propanediol) and 1,4-butanediol (1,4-Butanediol) were used. Polyethylene terephthalate (PET) resin modified by simultaneous use and PET resin modified using isophthalic acid were used in a ratio of 100:30.

Each of the barrier layer resin and adhesion layer resin was melted through a twin screw extruder. Controlled at -255-255°C. The molten resin passed through each extruder was co-extruded with a T-die at 265°C, and then rapidly cooled to room temperature through a cooling roller. Next, the coextruded resin was preheated to 80° C. and then stretched 3 times in the machine direction and 4 times in the width direction to prepare a biaxially stretched PET film for a protective film.

The thickness of each layer of the protective film was 12 μm for the blocking layer and 8 μm for the adhesive layer, so that the total thickness was 20 μm.

Next, the adhesive layers of the protective film prepared on both sides of the aluminum plate having a thickness of 0.24 mm are positioned to face each other, and the protective film is applied to the aluminum plate under the conditions of a temperature of 230° C., a roller pressure of 3 MPa, and a speed of 20 m/min. attached on both sides.

Next, a food storage container having an internal space in which food is accommodated and an open top was manufactured through press molding.

test example : direct fire exam

The prepared food storage container was filled with water and heated on a burner to conduct a direct fire test.

2 is a photograph showing the boiling state of water contained in a food storage container by heating, and FIG. 3 is a photograph showing the bottom surface of the food storage container in direct contact with the fire after heating for 5 more minutes from the time the water starts to boil. .

As shown in FIG. 3 , it was found that the state of the food storage container manufactured according to the embodiment of the present invention does not change even when directly heated.

That is, it was found that the food storage container according to the present invention can be directly heated by direct fire, microwave heating, or the like.

test example : Stability test

A stability test was conducted to determine whether substances harmful to the human body are not eluted from the food storage container manufactured according to the embodiment of the present invention.

The safety test was carried out according to the “Standards and Specifications of Instruments, Containers and Packaging” of the Ministry of Food and Drug Safety Notice No. 2021-76 of the Republic of Korea, and the measured results are shown in the table below.

As can be seen from the results of the above table, it was confirmed that the food storage container manufactured according to the embodiment of the present invention had excellent stability because substances harmful to the human body did not remain or eluted.

While the present invention has been shown and described in connection with preferred embodiments for illustrating the principles of the invention, the invention is not limited to the construction and operation as so shown and described, and is not intended to be limited by the appended claims. It will be understood by those skilled in the art that many changes and modifications can be made to the present invention without departing from the spirit and scope of the present invention.

100: food storage container
110: metal layer
120: protective film
121: blocking layer
122: adhesion layer
130: internal space

Claims (8)

A food storage container having an internal space to accommodate food and having an open top,
The food storage container consists of a metal layer and a protective film attached to the inner and outer surfaces of the metal layer, respectively,
The protective film includes a blocking layer, and an adhesive layer coupled to the blocking layer and attached to the metal layer,
The barrier layer is silicon dioxide (SiO ₂ ), titanium dioxide (TiO ₂ ), calcium carbonate (based on 100 parts by weight of PET resin modified using 1,4-cyclohexane dimethanol) CaCO ₃ ) and 1 to 20 weight % of inorganic particles selected from the group consisting of 1 to 5 parts by weight of a blended PET resin and 2 to 10 parts by weight of a PET resin modified using isophthalic acid. is done by
The adhesion layer uses 1,4-cyclohexane dimethanol (1,4-Cyclohexane Dimethanol), 1,3-propanediol (1,3-propanediol) and 1,4-butanediol (1,4-Butanediol) at the same time A food storage container comprising 10 to 50 parts by weight of a PET resin modified with isophthalic acid based on 100 parts by weight of the modified PET (Polyethylene terephthalate) resin.
According to claim 1,
The metal layer is a food storage container, characterized in that selected from the group consisting of iron, aluminum, chrome-plated steel, tin-plated steel.
delete delete preparing a protective film including a metal plate, a blocking layer, and an adhesive layer coupled to the blocking layer and attached to the metal plate;
positioning the protective film on one surface and the other surface of the metal plate, respectively;
attaching the adhesive layers of the protective film to both sides of the metal plate by applying heat and pressure; and
Forming a container having an internal space in which food is accommodated and having an open top;
The barrier layer is silicon dioxide (SiO ₂ ), titanium dioxide (TiO ₂ ), calcium carbonate (based on 100 parts by weight of PET resin modified using 1,4-cyclohexane dimethanol) CaCO ₃ ) and 1 to 20 weight % of inorganic particles selected from the group consisting of 1 to 5 parts by weight of a blended PET resin and 2 to 10 parts by weight of a PET resin modified using isophthalic acid. is done by
The adhesion layer uses 1,4-cyclohexane dimethanol (1,4-Cyclohexane Dimethanol), 1,3-propanediol (1,3-propanediol) and 1,4-butanediol (1,4-Butanediol) at the same time A method of manufacturing a food storage container, characterized in that it comprises 10 to 50 parts by weight of a PET resin modified using isophthalic acid with respect to 100 parts by weight of the modified PET (Polyethylene terephthalate) resin.
6. The method of claim 5,
The metal plate, a method of manufacturing a food storage container, characterized in that selected from the group consisting of a steel plate, an aluminum plate, a chrome-plated steel plate, a tin-plated steel plate
delete delete

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