KR101466224B1 - healthy food bowl using aluminum vapor attached film - Google Patents

Abstract

In today's cups, disposable food containers such as cups and noodles use synthetic resin endothelium, but synthetic resin endothelium softens or melts at about 80 ° C or higher. When hot food is put into these containers, a large amount of toxic chemicals are eluted into foods .
Until now, many people around the world have been studying to create health-safe cup-bead containers, but nothing truly industrialized.
The present invention relates to a disposable food container for preventing dissolution of harmful substances by attaching an aluminum foil to the inside of the container.
It is possible to form a container in which an aluminum foil is disposed on the inner surface of a disposable food container by forming an inner film for one side having an aluminum foil on one side and a synthetic resin or synthetic resin for paper or papers.
It is most preferable that the aluminum thin film is formed by vacuum-depositing aluminum on a HIPS film so that the aluminum thin film and the endothelial film adhere well to each other and are not damaged even when stretched when the container is molded.

Description

[0001] The present invention relates to an aluminum foil container,

The present invention relates to a disposable or reusable food container such as a cup-like container such as a cup noodle, a cup container, a soup container, and a lunch box container, in which a thin layer of aluminum is directly in contact with food, And to prevent the harmful substances in the plastic container from being released into the food

As the convenience of life has become more and more diverse, types of ready-to-eat foods have been increasing. However, these ready-to-eat foods have been eluted with various toxic chemicals into synthetic foods that are in contact with foods. In particular, hot liquid foods containing oil components elute large quantities of harmful chemicals in the synthetic resin, and these chemicals are very harmful to the human body.

Looking at the existing products, cups and containers are made of synthetic resin, and the inner part of the paper container is also made of synthetic resin. These synthetic resins are mainly polystyrene, polyethylene, polypropylene and the like.

The inventors of the present invention filed a Korean Utility Model Application No. 20-1998-0015053 filed on August 11, 1998 (a harmless structure of a one-time container using an aluminum foil or a foil) There is a bar. On July 27, 2006, the present inventors registered Korean Patent No. 10-0607404 (disposable food container using aluminum foil). This is a method of forming an aluminum inner container by molding a multi-layer plate having one side of an aluminum thin plate as in the present invention. However, the present invention is not limited to the production of aluminum vapor-deposited films as in the present invention, and HIPS is not selected as the film material.

In addition, Korean Patent Application No. 1998-72028 (Oct. 26, 1998) filed an application for making a container by preparing an aluminum container in a container form and then inserting it into the outer container of a disposable food container material, but industrialization is difficult.

Aluminum vacuum deposition films currently used in foods are used only to prevent air circulation. A synthetic resin film is coated on both sides of an aluminum thin film, and harmful substances are eluted from the film. As in the present invention, the vacuum deposition of aluminum on only one side of the film has not been used in containers or packaging of foods to date due to the peeling or packing of the aluminum layer.

Currently, PET (polyester, or polyethylene terephthalate) is commonly used as the material of aluminum vapor deposition film used for food packaging, and PP (polypropylene) is sometimes used. As in the present invention, aluminum was deposited on one surface of a HIPS film and used for food.

Conventional cup-shaped containers and disposable rice, soup, and porridge containers are made of synthetic resin components that are weak to heat such as polyethylene, polypropylene, or polystyrene. Since the heat resistance temperature of the synthetic resin is usually about 70 to 100 degrees Celsius In an environment of about 90 ° C to 100 ° C, which is the cooking temperature of food, a considerable amount of toxic chemicals are dissolved, and many chemicals are dissolved in foods and not consumed by people. The increased incidence of cancer in people today can be a significant contributor to the increased intake of these chemicals.

In the meantime, styrene, which is released from polystyrene containers, has been known as an environmental hormone, but was designated as a carcinogen in the United States in 2011.

In the MERCK INDEX (Merck Index) 14th Edition (2006 edition), the melting point of polyethylene is listed in the range of 85 to 110 degrees Celsius, and the lubricant and gasoline are used in the description of the properties of polyethylene and polystyrene, Infringed. It is also stated that polystyrene begins to soften from 85 degrees centigrade.

These data show that conventional disposable food containers containing oily liquids in a 90 ° C to 100 ° C cooking environment will have many harmful chemicals dissolved in food.

On the other hand, aluminum has a high melting point of 660 ° C, is not soluble in water or oil, is inexpensive, and is easy to process.

However, in order to achieve the present invention, the following problems must be solved.

1. Aluminum foil should be stretched without tearing during container molding.

2. The vacuum evaporated aluminum should not stick to the film and peel off.

3. Aluminum-coated endothelium film should be adhered well to existing skin materials such as PS or PP.

4. The film with the aluminum layer should also be stretched without tearing.

5. The film with the aluminum layer should be stretched uniformly.

In order to solve the above-mentioned problems and to achieve the present invention, aluminum vapor deposition is attached to one side of a synthetic resin film without using a general aluminum thin plate, and aluminum deposition with aluminum film on one side and synthetic resin film on one side The film is made into an endothelium.

The film for depositing aluminum is preferably PS, particularly HIPS.

An endothelial film uses one or more layers of a single material or a composite material.

In producing the container, the synthetic resin film having the aluminum thin film attached thereto may be formed as a multilayer plate so as to overlap with the sheathing material of the synthetic resin, and the aluminum thin film is placed on the surface of one surface, A food container located on the surface of the endothelium is prepared.

Roller and conveyor belts are used for conveying or joining the film or the sheath material on which the aluminum thin film is deposited.

The bonding of the inner portion and the outer portion can be carried out using both heat bonding and adhesive bonding.

Bonding points may be pre-bonded in a separate process or bonded together in a production line of the container.

It is also possible to heat the synthetic resin and flow it in a liquid phase between the inner skin and the outer skin to use it as an adhesive.

An adhesive film layer may be provided between the inner and outer covers.

EVA (ethylene vinyl acetate) is most preferable for the adhesive film or the synthetic resin for bonding.

The thickness of the aluminum thin film used in the present invention is 0.001 mu m to 3 mu m.

It is preferable that the thickness is 0.01 mu m to 0.1 mu m.

The thickness of the most preferable aluminum thin film is 0.03 mu m to 0.08 mu m.

According to the present invention, it is possible to economically and easily produce a disposable food container having an aluminum foil inside, thereby preventing leakage of toxic chemicals from the cup surface and protecting people's health.

In addition, the circulation of air in the cup surface and the like is more effectively blocked by the effect of the aluminum thin film, thereby preventing the oil component in the cup surface.

As an economical effect, sales of related products such as cup noodles and porridge will increase significantly as the safety of disposable food containers is ensured, and cups are expected to increase by more than 80%.

Of course, human health is the most precious value, so the effects of disease prevention such as cancer are infinite in terms of mental, physical, and economic aspects.

The product to which the present invention is applied is also suitable for the ethical mission of the enterprise to provide safe food in the food industry.

The present invention is an indispensable invention for making a healthy world in today's era of flood of harmful substances.

1 is a view showing a state in which aluminum (1) is vapor-deposited on a synthetic resin film
2 is a state in which the inner skin and the outer skin are overlapped.
3 is a schematic cross-sectional view of the container of the present invention
4 is a schematic process drawing of the container manufacturing process of the present invention.

The present invention is an invention in which an aluminum material is placed on the inner surface of a container in the manufacture of a disposable food container such as a cup surface container such as a cup noodle cup noodle, a lunch box container, a porridge container, a soup container or a disposable cup.

For this purpose, the aluminum film is attached by vacuum deposition on one side of one or more layers of single or composite synthetic resin film. It is made into an endo material and attached to an existing shell material (polystyrene, polypropylene, etc.) to form a multi-layered plate and then molding to form a food container with an aluminum foil layer on the inner surface.

The inner skin and the outer skin can be attached at the time of molding without attaching them in advance, but it is convenient to attach them in advance.

The present invention can be used almost as it is without changing the conventional manufacturing facilities such as a cup surface container and the like, so that only the endothelial bonding process can be simply added. The container mold can be used as it is in existing facilities, which is very economical.

In order to achieve the present invention, the following problems have to be solved.

1. Container molding Aluminum foil (thin film) tears when the casing of the container is stretched during molding in the mold. : Since aluminum is a metal, elongation is much smaller than synthetic resin.

2. The aluminum layer should be well adhered to the film and not peeled off (because aluminum is exposed)

3. The film for the endothelium and the outer skin material should be attached well.

4. The film for endothelium should be stretched without tearing.

5. The film for endothelium should be uniformly stretched when stretched. : It should not be partially stretched or directional.

In the test of the present invention, molding tests were conducted on a general aluminum foil having a thickness of 15 to 50 mu m. At this time, there has been a problem of the above-mentioned problem 1, and a problem that the aluminum foil plate is popped up has emerged.

We have studied the solution of this problem and have pointed out that the ductility of the metal will be better as the thickness of the metal is thinner. As a result, it was found that the aluminum thin film did not burst when it was formed. The present invention has been accomplished by continuing experiments and researches so as to satisfy other conditions as described above.

The present invention generally uses an extremely thin aluminum film having a thickness of 0.001 mu m to 3 mu m without using an ordinary aluminum foil having a thickness of 6 mu m to 50 mu m.

Such a thin film having a small thickness has a weak strength and tears very well. It can not be produced and handled alone. Aluminum is boiled in a nearly vacuum state on a synthetic resin film, and the generated vapor is attached to obtain a very thin metal thin film. This is used as the inner skin of disposable food containers.

The fabric for depositing the aluminum thin film is more preferably a synthetic resin film than paper, and the film of the synthetic resin is made of at least one layer of a single material or a composite material.

In the multilayered film, other synthetic resin film layers may be attached to the outside of the synthetic resin film layer after depositing aluminum on one layer of the synthetic resin film, but it is more preferable to deposit aluminum after the multilayer film is manufactured first.

The bonding between the inner and outer sheathing or the multilayered film can be achieved by heat bonding or adhesive bonding. The fabric film is transferred through a roller or a conveyor belt, and is bonded with heat or an adhesive.

The thickness of one layer of the synthetic resin film is about 30 탆.

However, when only one layer of the aluminum-deposited endothelial film is used, it is preferable to set the thickness to 50 탆 or more considering the handling strength. Preferably 50 to 80 占 퐉.

The aluminum deposition thickness is generally in the range of 0.01 탆 to 0.1 탆, and the initial deposition thickness is a limit of about 0.1 탆. The thickness of the above is difficult to deposit because the synthetic resin film of the fabric melts in the heat. In order to obtain a deposition thickness of 0.1 탆 or more, the deposition operation must be repeated, but the manufacturing cost is increased and the thicker the aluminum layer, the worse the workability of the deposited film becomes.

Repeated deposition operations several times can achieve a deposition thickness on the order of 1 탆, but this thickness actually increases the deposition cost, but does not provide the benefits of container shaping. Rather, the risk of damage increases.

Generally, a container having a shallow depth in the manufacture of a synthetic resin container which is molded with one metal mold can use an aluminum thin film having a thickness greater than that of a deeply deepened container, but it is preferable that the aluminum thin film has a maximum thickness of 1 μm or less.

As a result of the present invention, it is preferable that the thickness of the aluminum thin film which can be most commonly used in disposable food containers such as cup noodles currently available is a thickness within a range of one time of aluminum deposition, and a deposition thickness of 0.01 to 0.1 m, More preferably 0.03 to 0.09 탆.

When the deposition thickness exceeds 0.1 탆, it is impossible to deposit one cycle at a time, which is uneconomical. Further, as the aluminum layer is thicker at the time of molding, the workability of the aluminum thin film is deteriorated. Therefore, in the present invention, it is preferable to use a film in which aluminum is deposited to a thickness of 0.1 탆 or less, which is the aluminum deposition thickness once.

Generally, in the aluminum evaporated film for blocking air circulation in a confectionery bag or the like, the aluminum layer is not in the inner film but is in the middle layer between the synthetic resin film layers, and the thickness of the aluminum layer is about 0.03 mu m.

This thickness is used because it is known to be suitable for blocking air.

In the present invention, a multilayer plate is formed in a flat state on the inner skin and the outer skin, which are aluminum evaporated films, through a roller or a conveyor, and supplied to the mold, which is molded in a mold to form a container. In the case of a synthetic resin sheath, when the container material is drawn and processed in a mold, the material of the container is increased by 1 to 3 times and thinned.

Considering that aluminum is stretched during molding,

It is preferable to use an evaporated film having an aluminum layer with a thickness of about 0.05 mu m to 0.1 mu m in order to maintain a thickness of 0.03 mu m or more suitable for airblocking even after drawing and forming.

Chemical substances eluted from the synthetic resin container shell of the disposable food container are mostly larger than air molecules, so that they can be mostly blocked even if the thickness is less than 0.03 탆 and 0.01 탆 to 0.02 탆.

However, since food safety is a very important part, it is necessary to use an evaporated film having an aluminum thin film having a thickness of about 0.05 to 0.1 mu m which is about 2 to 3 times thicker than a general 0.03 mu m in order to secure a thin film having a thickness of about 0.03 mu m And 0.1 m is the limit of one time deposition, so 0.08 m is suitable for the safest deposition.

It is recommended that the deposition thickness of 0.08 μm is the optimum thickness for keeping the deposition stability and the thickness of the part where the aluminum is increased 2-3 times when forming the container to 0.3 μm. Of course, depending on the shape of the container, a container which does not significantly expand during molding is sufficient to have an aluminum thickness of about 0.03 占 퐉 to 0.05 占 퐉.

The present invention can produce an aluminum inner container at a lower cost than any other method economically.

Considering the lower limit of the thickness of the aluminum thin film, the covalent radius of the aluminum atom is 1.18 Å (0.118 nm). If the aluminum laminate is uniform, the chemistry of synthetic resin envelope containers with molecular weights greater than aluminum between the covalently bonded aluminum atoms can not theoretically pass.

Therefore, considering that the deposited aluminum atom layer is uniform, the distance between the atoms forming the covalent bond becomes 0.236 nm. Considering that the portion subjected to tensile force during molding is increased by 1 to 3 times and the thickness is thinned, (About 1 nm) or more, the lower limit of the thickness of the aluminum foil should be 1 nm (0.001 m) or more.

Therefore, the thickness of the aluminum thin film used in the present invention is in the range of 0.001 mu m to 1 mu m.

For forming the container, the outer material such as the endive material deposited on one side of the aluminum and the synthetic resin, which is a conventional disposable container material, is transferred using a roller and a conveyor to form a multi-layered plate and molded in a heated state. This results in a disposable food container with an aluminum foil attached to the endothelium. Of course, other processes or other companies can pre-adhere the endothelium and envelope in advance and roll them to use. It is convenient in the process to attach the inner and outer shells to each other.

The material of the inner layer and the material of the outer layer may be bonded by adhesive bonding or hot-pressing before the molding, or they may be adhered to each other at the time of molding in the mold.

As a result of the test of the present invention, EVA (ethylene vinyl acetate) has excellent adhesion. It can be positioned between the endothelium and the sheath in film form and can be heat bonded or adhesively bonded, such as MEK. EVA may have a melting point as low as 100 占 폚 to 110 占 폚 and may be adhered by flowing in a liquid state between the endothelium and the sheath.

Of course, it is not necessary to use EVA if the material of the inner film and the material of the outer skin adhere well.

The heating temperature for the molding of the mold in the mold or the previous stage is 250 ° C ± 150 ° C based on the most commonly used polystyrene.

In order to improve the workability, the temperature of the metal mold or the roller in contact with aluminum can be made higher than other portions.

For heat bonding other than adhesive bonding, it is necessary to use the same material for the synthetic resin layer, which is the one side of the endothelial layer, and the synthetic resin layer, which is attached to the outer skin layer.

In the case of different synthetic resins, it is often difficult to bond them even if they are heated to a temperature higher than the softening point or the melting point.

When the synthetic resin film of the inner layer with the aluminum foil is two or more layers, a material which adheres to each other at the time of heat bonding is selected.

The shell material of the present invention may be composed of two or more layers in synthetic resin or paper, but it is convenient to have one layer of synthetic resin.

The synthetic resin material of the present invention mainly uses a conventional disposable food container material, and mainly uses polystyrene, polyethylene, polypropylene, and starch materials. Of course, these composite materials can also be used.

Among the endothelial material of the present invention, the synthetic resin film material can be selected from among all industrialized film materials used in the past. The main materials are polystyrene, polyethylene, nylon, PVC, polypropylene, polyester and so on. The choice of materials is based on the deposition of aluminum, the adhesion to the outer material, the elongation of the film, At the time of film bonding, the film is selected in consideration of bonding property between films.

In particular, in order to achieve the present invention, the film to be deposited with aluminum must satisfy the following conditions.

1. Is aluminum well deposited?

2. Is the deposited aluminum firmly attached to the friction without being easily peeled off?

3. Even if tensile force is applied, can it be increased about 3 times without breaking easily?

4. Does the film stretch uniformly throughout its stretching?

5. Does the film adhere well to existing disposable food container materials, such as PS, directly or when attaching other films?

Aluminum deposited films used as food wrapping paper include PET and PP (OPP, CPP). However, as a result of the inventor's investigation, it has been impossible to produce aluminum-deposited films satisfying all of the above five conditions.

So we had to find a new film.

During the examination and testing of various materials, the PS film was selected as the material to be attached to the PS container, and the other conditions were satisfied except that the elongation was low. This film has a small elongation rate and contains a small amount of rubber.

HIPS (Hi Impact Poly Styrene), which is a mixture of rubber (natural rubber and synthetic rubber) ingredients in PS (poly styrene), was investigated by depositing aluminum on HIPS film. , The above five conditions can be all satisfied, and the present invention has been accomplished.

HIPS is not a new hazardous material because it is a material that is currently used for the purpose of reinforcing impact strength and the like, because PS has very weak strength on the inner skin or outer skin of PS container if it is a cup. It is a certified material in current food containers.

In PS cups, the HIPS currently used in the inner and outer shells of the container contain about 5% of the rubber component.

The endothelium obtained by depositing aluminum on the HIPS film studied in the present invention can be used as it is in the plastic envelope container as well as the paper cup envelope container.

The HIPS film usually used in the present invention has a rubber component of more than 5% to 70%, which is higher than that of the PS container. As the rubber component increases, the elasticity and tensile ratio of the film become better. Commonly used are synthetic rubbers.

However, since the price of synthetic rubber is more than twice the price of PS, it is not necessary to mix too much more than the modulus of elasticity necessary for forming the container.

The blending amount of the rubber component can be adjusted according to the extent to which the shape of the container increases. : When attaching the film of aluminum to HIPS and the PS sheath material, it is the same PS component, so it can be just heat or EVA layer in the middle.

It is preferable to place the EVA layer in the middle when attaching HIPS to other outer material such as PP.

The HIPS film in the present invention can also be used broadly to refer to a PS film in which a rubber component is mixed as a whole.

The bonding between the films can be performed using both heat bonding and adhesive bonding.

Of course, it is most convenient if you can construct the endothelium with one layer of film.

The following are some examples of the present invention.

Example 1. Aluminum sheet 15㎛ + adhesive + PS sheath

          → Aluminum breakage in container molding

Example 2. Aluminum thin plate 25㎛ + PE film + EVA film

          → Aluminum breakage in container molding

Example 3. Aluminum sheet 50 μm + PE film + EVA film

          → Aluminum breakage in container molding

Example 4. Heating bonding by material: Test

         (1) Good adhesion between PS, PE and PP materials

         (2) PE + PP, PE + PS, PET + PS, PP + PS No adhesion between different materials.

         (3) PE + EVA, PS + EVA, PET + PE attached

          *. Attached to the PS are PS, HIPS, EVA.

          *. EVA is attached to almost all materials.

          *. PP and EVA are attached to PP.

Example 5. Aluminum deposition 0.08 μm + PET + PE + EVA + PS sheath

          → The PET film was broken during the molding of the container, and the entire endothelium was damaged.

          *. Aluminum 0.08 ㎛ is not broken even if it is increased three times.

              (Container Inversion and Results of Extension Test Separated from Deposited Film).

EXAMPLES 6. The possibility of depositing aluminum on PS and HIPS and the peel test.

          → Good deposition, aluminum is safe for friction. No peeling.

Example 7. Peeling test in aluminum PET deposition.

          → Aluminum peels off when strong friction

          *. The deposited film on PET can be used somewhat with a small elongation percentage.

Example 8. Aluminum deposition 0.03 m + HIPS + PS sheath

          → Successful container molding.

          *. PS film can be used with small elongation rate.

          *. Compared with Example 5, 0.08 μm deposition is also possible.

EXAMPLES 9. Experimental Elongation Rate of Film

For the success of the present invention, the endothelial film must be able to increase three times.

         (1) HIPS, PE, EVA → Good elongation

         (2) PET, PS, PP → extension rate is insufficient.

          *. Films with a short elongation of less than 300% may also have better elongation at high temperature conditions.

EXAMPLES 10. Uniformity and Directionality Tests for Film Growth.

The film should be uniformly stretched when there is tensile force, and should not differ according to the direction of the length and the length.

         (1) HIPS → Good uniformity and directionality

         (2) HDPE → poor uniformity,

Example 11. Density and visual observation of aluminum layer during film growth.

When the PET film and the HIPS film, in which aluminum was vacuum-deposited to a thickness of 0.03 μm, were stretched about 2 to 3 times, the metallic luster was lost upon visual observation, and the metal density appeared to be somewhat lacking in observation.

However, the aluminum deposited PET film with a thickness of 0.08 탆 was found to have a sufficient metallic luster and sufficient thickness even when stretched 2 to 3 times during molding.

As a result of the experiments, vacuum deposition of aluminum on the HIPS film is the best choice for manufacturing the container of the present invention.

EVA is also the best adhesive resin for bonding the inner skin to the outer skin.

The deposition thickness of aluminum can be determined according to the required elongation of the container.

In the present invention, a HIPS film containing a rubber component is defined as an optimal film for an endothelium. However, a composite film containing a HIPS component may be used, and a general PS film may also be used.

Other synthetic resin films may have good physical properties as an endothelial film when they are mixed with a rubber component.

All such applications or variations are within the scope of the present invention.

The contents of the present invention will be described below with reference to the drawings. The drawings illustrate an outline of an embodiment and do not limit the scope of the present invention to the scope of the drawings, and various changes are possible, and such changes are within the scope of the present invention.

Fig. 1 shows an embodiment in which the HIPS synthetic resin film 2 is adhered to the aluminum thin film 1 as an example of the inner film portion of the present invention to which the aluminum thin film 1 is attached.

The synthetic resin film may be composed of several layers.

Fig. 2 shows a state in which the inner skin portion of the present invention shown in Fig. 1 and the synthetic resin 3 portion of the envelope, which are materials of the conventional disposable food container, are overlapped. The envelope portion 3 may also be made of one or more layers of synthetic resin or paper or a multi-layered plate of these composites.

Fig. 3 is a schematic cross-sectional view of a state in which the plate-like material of the container of the present invention shown in Fig. 2 is molded in a mold and molded into a container of the present invention. The aluminum thin film 1 is located on the inner surface.

Fig. 4 is an example of the disposable food container manufacturing process of the present invention, in which the aluminum evaporated film 6 of Fig. 1 and the existing disposable food container material envelope 7 such as synthetic resin are transported in a plate form to the roller 8, 2 as shown in Fig. And transferred to the mold 11 through the conveyor 10 to form a container as shown in FIG. A heating apparatus may be provided in a container forming mold, a conveyor, or a final roller process.

As shown in FIG. 4, since the inventive product can be produced by adding only the roller facility for supplying the aluminum evaporation film to the existing disposable food container production facility, the new facility investment cost is almost zero. In addition, since the cost of the aluminum evaporated film is very low, the present invention is a valuable invention that can greatly contribute to the health improvement of mankind with a great economic effect at a minimum cost.

Claims (1)

A method of manufacturing a disposable food container in which an aluminum foil is placed on an inner surface of a container,
A step of forming an inner skin by vacuum depositing an aluminum thin film on one surface of a HIPS (high impact polystyrene) film containing 5 to 70% of a rubber component,
Forming a multilayer plate by attaching or superimposing an outer skin (synthetic resin) constituting an outer shape of the inner skin and the container to each other in a plate form,
And forming the aluminum evaporated surface of the multi-layered plate so as to be the inner surface of the container, wherein the formed inner skin and the outer skin are stretched together during the molding.

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