KR20240052389A - High-performance anti-fog film - Google Patents

Abstract

The present invention relates to a highly functional anti-fog film. The anti-fog film according to an embodiment of the present invention includes an anti-fog layer and a basic base film layer formed on the anti-fog layer, and the anti-fog layer includes an anti-fog agent. It includes a first layer, a second layer formed on the first layer, and a third layer formed on the second layer, wherein the first layer, the second layer, and the third layer are each , low-density polyethylene and linear low-density polyethylene.

Description

High-performance anti-fog film {HIGH-PERFORMANCE ANTI-FOG FILM}

The present invention relates to a highly functional anti-fog film.

As the demand for packaged food increases due to urbanization and busy lifestyles and the tendency to prefer products with good appearance, taste, freshness, and safety increases, the demand for food packaging materials to minimize deterioration in food quality increases. It is becoming. In particular, in dry and wet product packaging, the moisture contained in the food ingredients evaporates into the air and water droplets form on the packaging film, which not only makes it difficult to see the contents of the packaging container properly, but also activates the growth of bacteria, causing spoilage of the food ingredients. You may.

When an anti-fog agent for food packaging is added during film production, it forms a thin anti-fog film on the film surface to prevent water droplets from condensing and forms a thin water film to maintain the freshness of the contents and make the contents visible. In most cases, the film surface is hydrophobic, so when it comes into contact with water droplets, it does not get wet and the contact angle increases, allowing the water droplet shape to remain for a long time. When an anti-fogging agent is added, the affinity between water and the film increases and the contact angle between the water droplets and the film decreases, so water droplets do not form on the surface of the film, but become wet and spread out, making it transparent.

When using such anti-fogging agents, only raw materials specified for addition to food packaging materials should be used, and anti-fogging agents should be selected taking into account characteristics such as anti-fogging effect, initialization, persistence, low temperature, high temperature resistance, and physical properties such as slip properties of the film. When adding an anti-fog agent, the effect may depend on the type of plastic. In general, CPP film is easy to maintain the anti-fog function, but in the case of PE film, it is difficult to maintain the anti-fog function when laminated. In addition, since improving anti-fog performance can cause adsorption, it is important to maintain anti-fog function while maintaining the physical properties of the film.

The above-mentioned background technology is possessed or acquired by the inventor in the process of deriving the disclosure of the present application, and cannot necessarily be said to be known technology disclosed to the general public before the present application.

The present invention seeks to provide a highly functional anti-fog film to solve the above-mentioned problems.

Specifically, according to the present invention, it is intended to provide an anti-fog film with good slip properties that maintains the freshness of the contents and prevents water vapor and water droplets from forming in the contents due to temperature changes.

However, the problem to be solved by the present invention is not limited to the problems mentioned above, and other problems not mentioned can be clearly understood by those skilled in the art from the description below.

An anti-fog film according to an embodiment of the present invention includes an anti-fog layer; and a basic base film layer formed on the anti-fog layer, wherein the anti-fog layer includes a first layer containing an anti-fog agent; a second layer formed on the first layer; and a third layer formed on the second layer, wherein the first layer, the second layer, and the third layer may include low-density polyethylene and linear low-density polyethylene, respectively.

According to one embodiment, the basic base film layer includes a first PE layer including PE; A deposition layer formed on the first PE layer and transparently depositing PET; a second PE layer formed on the deposition layer and including PE; and a PET layer formed on the second PE layer and including PET.

According to one embodiment, the linear low-density polyethylene of the first layer may include low-slip linear low-density polyethylene.

According to one embodiment, the antifogging agent is polyglycerin fatty acid ester, glycerin fatty acid ester, sorbitan ester, glycerol ester, ethoxylated sorbitan ester, ethanol amine, diethanol amine, triethanol amine, N-methyl ethanol amine, N- It may include at least one selected from the group consisting of butylmonoethanolamine, N-butyldiethanolamine, acrylate, and methyl methacrylate.

According to one embodiment, the content of the anti-fog agent may be 14% to 16% by weight of the first layer.

According to one embodiment, the first layer may include a slip agent.

According to one embodiment, the slip agent is 3-(2,3-dihydroxypropoxy)-2-hydroxypropyl oleate (3-(2,3-Dihydroxypropoxy)-2-hydroxypropyl oleate), Eruka It may contain at least one selected from the group consisting of amide (Erucamide), oliamide (Oliamide), and stearamide (Stearamide).

According to one embodiment, the content of the slip agent may be 0.5% by weight to 2% by weight of the first layer.

According to one embodiment, the thickness of the first layer may be 12 ㎛ to 13 ㎛, the thickness of the second layer may be 24 ㎛ to 26 ㎛, and the thickness of the third layer may be 12 ㎛ to 13 ㎛. .

According to one embodiment, the thickness of the anti-fog layer may be 50% to 60% of the thickness of the anti-fog film.

According to one embodiment, the anti-fog film may have a peeling strength of 0.3 kgf/mm2 to 0.6 kgf/mm2.

According to one embodiment, the anti-fog film may have a sealing strength of 5.5 kgf/mm2 to 7.5 kgf/mm2.

According to one embodiment, the anti-fog film may be in the form of a pouch and an automatic roll.

According to one embodiment, the anti-fog layer includes a fourth layer formed on the third layer; and a fifth layer formed on the fourth layer, wherein the first layer is 10 ㎛ to 12 ㎛, and the second layer, the fourth layer, and the fifth layer are 7 ㎛ to 8 ㎛. And the third layer may be 15 ㎛ to 17 ㎛.

An anti-fogging film manufacturing method according to an embodiment of the present invention includes a blown film ejection step; T-die type stage; and Castin Type step.

The present invention can provide a highly functional anti-fog film.

Specifically, according to the present invention, it is possible to provide an anti-fog film with good slip properties that maintains the freshness of the contents and prevents water vapor and water droplets from forming due to temperature changes.

1 is a conceptual diagram of an anti-fog film according to an embodiment of the present invention.
Figure 2 is a conceptual diagram of a basic base film layer according to an embodiment of the present invention.
Figure 3 shows anti-fog performance results immediately after an oven test according to an embodiment of the present invention.
Figure 4 shows the anti-fog performance results after 30 minutes of an oven test according to an embodiment of the present invention.

Hereinafter, embodiments will be described in detail with reference to the attached drawings. However, various changes can be made to the embodiments, so the scope of the patent application is not limited or limited by these embodiments. It should be understood that all changes, equivalents, or substitutes for the embodiments are included in the scope of rights.

The terms used in the examples are for descriptive purposes only and should not be construed as limiting. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as “comprise” or “have” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by a person of ordinary skill in the technical field to which the embodiments belong. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and unless explicitly defined in the present application, should not be interpreted in an ideal or excessively formal sense. No.

In addition, when describing with reference to the accompanying drawings, identical components will be assigned the same reference numerals regardless of the reference numerals, and overlapping descriptions thereof will be omitted. In describing the embodiments, if it is determined that detailed descriptions of related known technologies may unnecessarily obscure the gist of the embodiments, the detailed descriptions are omitted. Additionally, in describing the components of the embodiment, terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish the component from other components, and the nature, order, or order of the component is not limited by the term. When a component is described as being “connected,” “coupled,” or “connected” to another component, that component can be connected or connected directly to that other component, but there is no need for another component between each component. It should be understood that may be “connected,” “combined,” or “connected.”

Components included in one embodiment and components including common functions will be described using the same names in other embodiments. Unless stated to the contrary, the description given in one embodiment may be applied to other embodiments, and detailed description will be omitted to the extent of overlap.

An anti-fog film according to an embodiment of the present invention includes an anti-fog layer; and a basic base film layer formed on the anti-fog layer, wherein the anti-fog layer includes a first layer containing an anti-fog agent; a second layer formed on the first layer; and a third layer formed on the second layer, wherein the first layer, the second layer, and the third layer may include low-density polyethylene and linear low-density polyethylene, respectively.

1 is a conceptual diagram of an anti-fog film according to an embodiment of the present invention.

Referring to Figure 1, the anti-fog film 100 according to the present invention is formed on the anti-fog layer 110 and the anti-fog layer including the first layer 111, the second layer 112, and the third layer 113. It includes a basic base film layer 120. The anti-fog layer 110 of the anti-fog film 100 may maintain its anti-fog function even after the process of laminating the films of the basic base film layer 120 and the anti-fog layer 110.

The anti-fog film 100 according to the present invention has an anti-fog effect while containing an anti-fog agent, and can maintain the physical properties of the film and the freshness and transparency of the contents in the pouch-shaped film.

Low-density polyethylene has a low density and is not hard, but has excellent elasticity, making it easy to process and has excellent waterproofing properties. Linear low-density polyethylene has excellent physical properties due to its thin thickness, excellent strength, transparency and heat resistance, and is used as a packaging film. It may be suitable. However, manufacturing a film using only low-density polyethylene may cause economic problems such as higher unit costs, and using only linear low-density polyethylene may cause the film to stretch. This problem can be solved by using a mixture of low-density polyethylene and linear low-density polyethylene.

According to one embodiment, the weight ratio of low-density polyethylene and linear low-density polyethylene may preferably be 3:7 to 4:6. If the weight ratio is less than this range, problems with tearing resistance may occur, and if it exceeds the range, heat sealing may be reduced. Problems may arise.

According to one embodiment, the basic base film layer includes a first PE layer including PE; A deposition layer formed on the first PE layer and transparently depositing PET; a second PE layer formed on the deposition layer and including PE; and a PET layer formed on the second PE layer and including PET.

Figure 2 is a conceptual diagram of a basic base film layer according to an embodiment of the present invention. However, Figure 2 is an exemplary drawing and does not limit the thickness of each layer, and the actual thickness of each layer may be different.

According to one embodiment, the basic base film layer is a lamination of PE and PET films and may have enough strength not to be damaged or deformed even by external shocks that may be applied to the product during distribution. Texts and pictures can be printed on the joint surface of the second PE layer and PET layer, and a film made of a material that maintains transparency and clarity can be used to clearly express the printing state. The deposition layer is deposited on the surface of PET by heating and evaporating Al ₂ O _x , and can provide a film without metallic luster through transparent deposition.

According to one embodiment, the linear low-density polyethylene of the first layer may include low-slip linear low-density polyethylene.

Commercially available linear low-density polyethylene generally contains slip agents, which may reduce its anti-fogging effect. By using low-slip linear low-density polyethylene, it is possible to improve the decrease in anti-fog effect caused by the existing slip agent and create an anti-fog film that exhibits excellent anti-fog effect.

According to one embodiment, the low-slip linear low-density polyethylene may be a two-component polyethylene. Unlike the one-component type, the two-component type has a curing coating applied during the polyethylene process, which is advantageous in terms of heat generation during the process, so the two-component polyethylene may have a higher anti-fogging effect than the one-component polyethylene.

According to one embodiment, the antifogging agent is polyglycerin fatty acid ester, glycerin fatty acid ester, sorbitan ester, glycerol ester, ethoxylated sorbitan ester, ethanol amine, diethanol amine, triethanol amine, N-methyl ethanol amine, N- It may include at least one selected from the group consisting of butylmonoethanolamine, N-butyldiethanolamine, acrylate, and methyl methacrylate.

When the hydrophobic film surface encounters water droplets, it does not get wet and the contact angle increases, allowing the water droplet shape to remain for a long time. Anti-fog agents increase the affinity between water and film and reduce the contact angle between water droplets and film, allowing water droplets to wet and spread instead of condensing.

According to one embodiment, the anti-fog agent may include a surfactant, but is not limited to the anti-fog agent.

According to one embodiment, the content of the anti-fog agent may be 14% to 16% by weight of the first layer.

According to one embodiment, if the content of the anti-fog agent is less than 14% by weight, the anti-fog function may not be implemented, and if it exceeds 16% by weight, there may be a problem of reduced adhesion between constituent layers. When the content of the anti-fog agent is within the above range, the anti-fog effect can be excellent.

According to one embodiment, the first layer may include a slip agent.

Slip agents lower the friction coefficient of the resin and can prevent the blocking phenomenon where film surfaces adhere to each other.

According to one embodiment, an adsorption phenomenon may occur during the anti-fog film process after adding an anti-fog agent to improve anti-fog performance. Slip agents provide a smooth surface through a lubricating action that reduces friction between films or between films and machine contact surfaces, and can reduce the blocking phenomenon of anti-fog films after processing.

According to one embodiment, the slip agent is 3-(2,3-dihydroxypropoxy)-2-hydroxypropyl oleate (3-(2,3-Dihydroxypropoxy)-2-hydroxypropyl oleate), Eruka It may contain at least one selected from the group consisting of amide (Erucamide), oliamide (Oliamide), and stearamide (Stearamide).

According to one embodiment, the slip agent may not inhibit the anti-fogging effect. Some slip agents can reduce the anti-fog effect, but the slip agent can reduce the blocking phenomenon without inhibiting the anti-fog effect of the anti-fog film caused by the anti-fog agent.

According to one embodiment, the content of the slip agent may be 0.5% by weight to 2% by weight of the first layer.

According to one embodiment, if the slip agent content is less than 0.5% by weight, there may be a problem of a decrease in friction coefficient, and if it exceeds 2% by weight, there may be a problem of decreased adhesion due to migration to the outer surface. If the slip agent content is outside the above range, the anti-fog effect may be reduced.

According to one embodiment, the first layer may have a thickness of 12 ㎛ to 13 ㎛, the second layer may have a thickness of 24 ㎛ to 26 ㎛, and the third layer may have a thickness of 12 ㎛ to 13 ㎛. .

If the thickness of the first layer is thinner than 12 ㎛, there may be a problem of thickness reduction, and if it is thicker than 13 ㎛, there may be a problem of reduced anti-fog function.

If the thickness of the second layer is thinner than 24 ㎛, there may be a problem of thickness reduction, and if it is thicker than 26 ㎛, there may be a problem of reduced tearability.

If the thickness of the third layer is thinner than 12 ㎛, there may be a problem of thickness reduction, and if it is thicker than 13 ㎛, there may be a problem of reduced tearing resistance.

According to one embodiment, the thickness of the anti-fog layer may be 50% to 60% of the thickness of the anti-fog film.

According to one embodiment, the thickness of the anti-fog layer may preferably be 55% to 60% of the thickness of the anti-fog film.

According to one embodiment, if the thickness of the anti-fog layer is less than 50% of the anti-fog film thickness, there may be a problem of thickness reduction, and if it exceeds 60%, there may be a problem of reduction of anti-fog function.

According to one embodiment, the anti-fog film may have a peeling strength of 0.3 kgf/mm2 to 0.6 kgf/mm2.

According to one embodiment, the peel strength may preferably be 0.4 kgf/mm2 to 0.5 kgf/mm2.

Peel strength is a measure of resistance to peeling and can be used as an indicator to check the adhesive strength of the film. If the peel strength is within the above range, the anti-fog film can be used as a packaging material.

According to one embodiment, the anti-fog film may have a sealing strength of 5.5 kgf/mm2 to 7.5 kgf/mm2.

According to one embodiment, the sealing strength may preferably be 6.0 kgf/mm2 to 7.0 kgf/mm2.

Sealing strength has the same meaning as sealing strength and refers to the adhesive strength of the sealing part. In other words, the maximum load just before the sealing part is separated by pulling in the opposite direction to the sealing until the sealing part is destroyed is called the sealing strength. In order to manage the problem of separation of the heat-sealed area for film adhesion, the sealing strength is evaluated. If the sealing strength is within the above range, the internal contents are prevented from leaking to the outside, and external oxygen and moisture enter the inside. This helps prevent it from reacting with the contents.

According to one embodiment, the anti-fog film may be in the form of a pouch and an automatic roll.

The anti-fog film may be used to store products such as fresh food and processed food in the form of a pouch or automatic roll.

According to one embodiment, the anti-fog film may be formed in the form of a Thompson pouch, stick pouch, two-way pouch, three-way pouch, standing pouch, box pouch, spout pouch, flat bottom pouch, M-shaped pouch, or T-shaped pouch.

According to one embodiment, the anti-fog layer includes a fourth layer formed on the third layer; and a fifth layer formed on the fourth layer, wherein the first layer is 10 ㎛ to 12 ㎛, and the second layer, the fourth layer, and the fifth layer are 7 ㎛ to 8 ㎛. And the third layer may be 15 ㎛ to 17 ㎛.

An anti-fogging film manufacturing method according to an embodiment of the present invention includes a blown film ejection step; T-die type stage; and Castin Type step.

Hereinafter, the present invention will be described in more detail through examples and comparative examples.

However, the following examples are only for illustrating the present invention, and the content of the present invention is not limited to the following examples.

Example

As a first film layer, a 12-13 ㎛ thick first layer containing 15% by weight of anti-fogging additive and 1% by weight of slip agent on low-slip linear low-density polyethylene was prepared, and then low-density polyethylene and linear low-density polyethylene were mixed in a ratio of 3:7. An anti-fog layer was formed by adhering a second layer prepared to a thickness of 24 to 26 ㎛ and a third layer to be 12 to 13 ㎛ thick by mixing in a weight ratio, and bonded to the basic base film layer to prepare a highly functional anti-fog film. . At this time, the film was manufactured through co-extrusion using a T-die extruder, and the film thickness was 40 to 50 ㎛.

Comparative Example 1

As a first film layer, a 12-13 ㎛ thick first layer containing 20% by weight of anti-fogging additive and 1% by weight of slip agent in one-component linear low-density polyethylene was prepared, and then low-density polyethylene and linear low-density polyethylene were mixed in a ratio of 3:7. An anti-fog layer is formed by adhering a second layer prepared to a thickness of 24 to 26 ㎛ by mixing in a weight ratio and a third layer to a thickness of 12 to 13 ㎛, and bonded to a basic base film layer composed of a high-performance anti-fog film to form an anti-fog layer. A film was prepared. At this time, the film was manufactured through co-extrusion using a T-die extruder, and the film thickness was 40 to 50 ㎛.

Comparative Example 2

As a first film layer, a 12-13 ㎛ thick first layer containing 20% by weight of anti-fogging additive and 1% by weight of slip agent in two-component linear low-density polyethylene was prepared, and then low-density polyethylene and linear low-density polyethylene were mixed in a ratio of 3:7. An anti-fog layer is formed by adhering a second layer prepared to a thickness of 24 to 26 ㎛ by mixing in a weight ratio and a third layer to a thickness of 12 to 13 ㎛, and bonded to a basic base film layer composed of a high-performance anti-fog film to form an anti-fog layer. A film was prepared. At this time, the film was manufactured through co-extrusion using a T-die extruder, and the film thickness was 40 to 50 ㎛.

Experimental Example 1: Measurement of anti-fogging effect

A pouch with a size of 160 mm × 200 mm was manufactured using the anti-fog film according to the above examples and comparative examples, and the anti-fog effect of the anti-fog film pouch was confirmed through an oven test.

In the experiment, beef jerky was placed in a pouch, sealed, placed in an oven, stored at 60°C for 30 minutes, and compared by checking the degree of water droplets forming and the degree to which the contents were visible to the naked eye.

Figure 3 shows the results of anti-fog performance immediately after an oven test according to an embodiment of the present invention, Figure 3(a) shows the results of Comparative Example 1, Figure 3(b) shows the Example, and Figure 3(c) shows the results of Comparative Example 2. .

Referring to Figure 3, in the case of the example, it can be confirmed with the naked eye that water droplets do not form on the film and the contents are clearly visible, whereas in the case of Comparative Examples 1 and 2, it can be seen that water droplets form on the film due to moisture and the contents are partially obscured. You can.

Figure 4 shows the anti-fog performance results after 30 minutes of an oven test according to an embodiment of the present invention, Figure 4(a) is Comparative Example 1, Figure 4(b) is the Example, and Figure 4(c) is Comparative Example 2. It is a result.

Referring to Figure 4, it can be seen that moisture has disappeared 30 minutes after the oven test compared to immediately after the oven test, but it can be seen that moisture still remains in Comparative Examples 1 and 2. It can be seen that the anti-fogging effect of the example is superior to that of Comparative Examples 1 and 2 even over time.

Experimental Example 2: Peel strength and sealing strength test

It was manufactured in the form of a pouch using the anti-fog film according to the above example, and the peel strength and sealing strength were measured after being stored in an oven at 50° C. for 144 hours.

After manufacturing the packaging material sample into a specimen with a width of 15 mm, the sealing strength was measured five times using a universal testing machine (UTM) at a test speed of 200 mm/min, and the average value was calculated.

As a result, it can be confirmed that the peel strength of the example is 0.427 kgf/㎟ and the sealing strength is 6.34 kgf/㎟, which is higher than the peel strength and sealing strength of general packaging pouches.

Although the embodiments have been described as above, those skilled in the art can apply various technical modifications and variations based on the above. For example, the described techniques are performed in a different order than the described method, and/or components of the described system, structure, device, circuit, etc. are combined or combined in a different form than the described method, or other components are used. Alternatively, appropriate results may be achieved even if substituted or substituted by an equivalent.

Therefore, other implementations, other embodiments, and equivalents of the claims also fall within the scope of the following claims.

100: Anti-fog film
110: Anti-fog layer
111: first floor
112: second floor
113: Third floor
120: Basic base film layer
121: first PE layer
122: deposition layer
123: second PE layer
124: PET layer

Claims (14)

anti-fog layer; and
It includes a basic base film layer formed on the anti-fog layer,
The anti-fog layer includes a first layer containing an anti-fog agent;
a second layer formed on the first layer; and
It includes a third layer formed on the second layer,
wherein the first layer, the second layer and the third layer comprise low density polyethylene and linear low density polyethylene, respectively.
Anti-fog film.
According to paragraph 1,
The basic base film layer is,
A first PE layer comprising PE;
A deposition layer formed on the first PE layer and transparently depositing PET;
a second PE layer formed on the deposition layer and including PE; and
A PET layer formed on the second PE layer and including PET,
Anti-fog film.
According to paragraph 1,
The linear low-density polyethylene of the first layer comprises low-slip linear low-density polyethylene,
Anti-fog film.
According to paragraph 1,
The antifogging agent includes polyglycerin fatty acid ester, glycerin fatty acid ester, sorbitan ester, glycerol ester, ethoxylated sorbitan ester, ethanol amine, diethanol amine, triethanol amine, N-methyl ethanol amine, N-butyl monoethanolamine, Containing at least one selected from the group consisting of N-butyldiethanolamine, acrylate, and methyl methacrylate,
Anti-fog film.
According to paragraph 1,
The content of the anti-fog agent is 14% to 16% by weight of the first layer,
Anti-fog film.
According to paragraph 1,
The first layer includes a slip agent,
Anti-fog film.
According to clause 6,
The slip agent is 3-(2,3-dihydroxypropoxy)-2-hydroxypropyl oleate (3-(2,3-Dihydroxypropoxy)-2-hydroxypropyl oleate), Erucamide, Containing at least one selected from the group consisting of oliamide and stearamide,
Anti-fog film.
According to clause 6,
The content of the slip agent is 0.5% to 2% by weight of the first layer,
Anti-fog film.
According to paragraph 1,
The thickness of the first layer is 12 ㎛ to 13 ㎛,
The thickness of the second layer is 24 ㎛ to 26 ㎛,
The thickness of the third layer is 12 ㎛ to 13 ㎛,
Anti-fog film.
According to paragraph 1,
The thickness of the anti-fog layer is 50% to 60% of the thickness of the anti-fog film,
Anti-fog film.
According to paragraph 1,
The anti-fog film has a peel strength of 0.3 kgf/mm2 to 0.6 kgf/mm2,
Anti-fog film.
According to paragraph 1,
The anti-fog film has a sealing strength of 5.5 kgf/㎟ to 7.5 kgf/㎟,
Anti-fog film.
According to paragraph 1,
The anti-fog film is in pouch form and automatic roll,
Anti-fog film.
According to paragraph 1,
The anti-fog layer is,
a fourth layer formed on the third layer; and
It includes a fifth layer formed on the fourth layer,
The first layer is 10 ㎛ to 12 ㎛, the second layer, the fourth layer and the 5th layer are 7 ㎛ to 8 ㎛, and the third layer is 15 ㎛ to 17 ㎛,
Anti-fog film.

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