KR20130089387A - Polyethylene film laminated by aluminium for packaging the display products - Google Patents

Abstract

PURPOSE: A polyethylene film product laminated with aluminum is provided to co-extrude materials of an outer layer, a middle layer, and an inner layer, thereby simplifying manufacturing process and reducing cost of production. CONSTITUTION: A polyethylene film product laminated with aluminum comprises a polyethylene layer composed of an outer layer, a middle layer, and an inner layer; an aluminum layer laminated onto the outer layer; and a nylon layer. The outer layer is composed of outer layer forming composition which includes low-density polyethylene and linear low-density polyethylene. The middle layer is composed of middle layer forming composition which includes two or more kinds of material selected among low-density polyethylene, linear low-density polyethylene, and high-density polyethylene. The inner layer is composed of inner layer forming composition which includes one or more kinds of material selected among middle-density polyethylene, low-density polyethylene, and linear low-density polyethylene.

Description

Polyethylene film laminated by aluminum for packaging the display products}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to aluminum laminated films for packaging display products, and more particularly, to packaging polyethylene films for packaging electronic display products such as liquid crystal display (LCD) TVs, monitors, notebooks, and the like.

In general, electronic display products such as liquid crystal display (LCD) TVs, monitors, notebooks, etc., are concerned about screen scratches during transportation, storage, and processing, and the screens are often contaminated by dust or foreign substances in the air. In order to prevent such a problem, a protective film is attached to the screen of the electronic display product, and the electronic display is stored in a packaging bag for screen protection.

Currently, the film for screen protection of the electronic display being used is manufactured by coating a permanent antistatic agent (AS) on a polyethylene terephthalate (PET) film.

However, these screen protection films have high stiffness, which is easy to cause scratches on the display surface, and stain and poll-dirty phenomenon are likely to occur due to the implementation of a coated permanent antistatic agent. In addition, the production cost is high and the productivity is low because the secondary process is required for the antistatic agent coating.

The packaging bag for an electronic display product is semi-deposited aluminum on a polyethylene terephthalate film, and then coated with an antistatic agent to produce a film, and the two films are overlapped and heat-sealed to produce an envelope.

Since the packaging bag is laminated with a polyethylene terephthalate (PET) film and a linear low density polyethylene film coated with aluminum and a permanent antistatic agent, there is a problem in that different materials are mixed and recycling is difficult. In addition, since aluminum is deposited on the polyethylene terephthalate film, and then an antistatic agent must be coated, three processes are included in the polyethylene terephthalate film manufacturing process, which makes the manufacturing process complicated. In addition, the use of high rigidity PET film (Stiffness), the scratch on the display screen (scratch) is severe, due to the implementation of the coating-type permanent antistatic agent is severe stains and poll-dirty (Pol-dirty).

When packaging a product using a conventional bag, there is a problem in that a double operation of covering the packaging bag is required after attaching a PE film or a PET protective film to the screen to protect the screen. have.

In the present invention, in order to solve the above problems, PET protective film is not required when packaging display products, while satisfying the required properties similar to those of conventional PET film, the production cost is low, and the wear resistance and slip An object of the present invention is to provide a polyethylene film used for a packaging bag having excellent moisture permeability, without causing scratches on the display screen, without having a pol-dirty phenomenon, and having excellent moisture permeability.

The object of the present invention as described above,

It consists of a polyethylene film layer consisting of three layers of an outer layer, a middle layer and an inner layer, and an aluminum layer and a nylon layer laminated to the outer layer,

The outer layer consists of an outer layer forming composition containing low density polyethylene and linear low density polyethylene,

The middle layer is made of a middle layer forming composition containing at least two selected from the group consisting of low density polyethylene, linear low density polyethylene, and high density polyethylene, and

The inner layer is achieved by a polyethylene film for display product packaging, comprising an inner layer forming composition containing at least one selected from the group consisting of medium density polyethylene, low density polyethylene and linear low density polyethylene.

Preferably, the outer layer forming composition is 25 to 75 parts by weight of low density polyethylene and 25 to 75 parts by weight of linear low density polyethylene, the middle layer composition is 25 to 75 parts by weight of low density polyethylene and 25 to 75 parts by weight of linear low density polyethylene Or 25 to 50 parts by weight of low density polyethylene, 25 to 50 parts by weight of linear low density polyethylene and 25 to 50 parts by weight of high density polyethylene, and the inner layer forming composition is composed of 100 parts by weight of medium polyethylene or medium density polyethylene. 25 to 75 parts by weight and 25 to 75 parts by weight of low density polyethylene.

Preferably, the aluminum layer, nylon layer, outer layer, middle layer And the thicknesses of the inner layer are 5 to 30%, 5 to 30%, 10 to 50%, 25 to 70% and 10 to 50% relative to the total thickness of the entire polyethylene film, respectively.

Preferably, the high density polyethylene has a melt index of 0.1 to 10 g / 10 min. And a density of 0.940 to 0.965 g / cm ^3. ego,

The medium density polyethylene has a melt index of 0.1 to 10 g / 10 min. And a density of 0.926 to 0.945 g / cm ^3. ego,

The linear low density polyethylene has a melt index of 0.1 to 10 g / 10 min. And a density of 0.910 to 0.925 g / cm ^3. ego,

The low density polyethylene has a melt index of 0.3 to 10 g / 10 min. And a density of 0.918 to 0.925 g / cm ³ .

Preferably, the inner layer forming composition further comprises carbon nanotubes (CNT), and 0.1 to 10 parts by weight of carbon nanotubes, 30 to 60 parts by weight of low density polyethylene, and 30 to 60 parts by weight of linear low density polyethylene.

The polyethylene film for packaging display products of the present invention has the advantage that the production process of the film is low because the process is simple by including one step of co-extrusion of each composition constituting the outer layer, the middle layer and the inner layer at the time of its manufacture.

In addition, the present invention is a polyethylene film for packaging display products, there is no film stiffness and migration to the film surface to facilitate the operation of the display screen packaging process, the stain and pol-dirty phenomenon It has no merit and has the advantage of excellent tensile strength and scratch resistance of the film.

In particular, since a separate protective film is not required, the product packaging process is simple, the production cost is low, and the moisture permeability and the wear resistance are excellent, so that the product is easily transported or stored.

Hereinafter, the present invention will be described in detail with respect to the polyethylene film laminated with nylon and aluminum used for packaging display products.

The polyethylene film of this invention consists of a polyethylene layer which consists of three layers of an outer layer, a middle layer, and an inner layer, and the nylon and aluminum layer laminated | stacked on the outer layer of the said polyethylene layer.

The nylon layer uses a biaxially stretched film having a thickness of 10 to 30 μm, and the nylon layer functions to enhance the rigidity of the aluminum layer.

Since the aluminum layer uses a thin film having a thickness of 5 to 20 μm and is used to maintain moisture permeability during product packaging, it is preferable to use a product having excellent pin-hole characteristics.

In the present invention, a nylon layer and an aluminum layer are laminated on the outer layer of the polyethylene layer to impart moisture permeability to the packaging film. When the nylon layer and the aluminum layer are laminated, the moisture permeability of the packaging film is preferably 1 g / m ² / day or less. If the moisture permeability of the packaging film exceeds 1g / m ² / day, moisture may penetrate into the packaging bag and cause damage to IT parts such as LCD.

The outer layer consists of an outer layer forming composition containing low density polyethylene and linear low density polyethylene, preferably 25 to 75 parts by weight of low density polyethylene and 25 to 75 parts by weight of linear low density polyethylene. The outer layer is a layer laminated with the aluminum layer in the packaging polyethylene film of the present invention, and surface modification treatment (Corona Treatment) is required so that the aluminum layer does not peel off when laminated.

It is preferable that the polyethylene composition of the outer layer of this invention consists of a combination of low density polyethylene and linear low density polyethylene. This can increase the appropriate stiffness of the film to enhance adhesion and adhesion strength when laminating with the aluminum layer. Low density polyethylene has a low density and has good bubble stability during film forming, thereby maintaining excellent film smoothness and improving initial adhesion. In addition, the linear low density polyethylene is somewhat inferior in bubble stability when forming a film, but the strength of the film may be excellent, thereby increasing the adhesive strength.

The middle layer is composed of a middle layer forming composition containing at least two selected from the group consisting of low density polyethylene, linear low density polyethylene, and high density polyethylene. Preferably it is 25 to 75 parts by weight of low density polyethylene and 25 to 75 parts by weight of linear low density polyethylene, or 25 to 50 parts by weight of low density polyethylene, 25 to 50 parts by weight of linear low density polyethylene and 25 to 50 parts by weight of high density polyethylene. . The middle layer is a layer that provides a harder texture and strength to facilitate handling when the polyethylene film of the present invention is attached to a display screen.

The middle layer polyethylene composition of the present invention is composed of a combination of low density polyethylene and linear low density polyethylene, or a combination of low density polyethylene, linear low density polyethylene and high density polyethylene, thereby increasing the moderate stiffness of the film, so that the degree of splitting and abrasion resistance is increased. It is possible to increase, and the effect of preventing the phenomenon of water stains on the display screen when the storage at high temperature and high humidity can be obtained. Low-density polyethylene can maintain excellent film smoothness because it has good bubble stability during film molding, while linear low-density polyethylene has slightly inferior bubble stability when film forming, but high-density polyethylene has high density and high stiffness. Can be increased.

In the film of the present invention, the inner layer is composed of an inner layer forming composition containing at least one selected from the group consisting of medium density polyethylene, low density polyethylene and linear low density polyethylene. Preferably it consists of 100 parts by weight of medium polyethylene, or 25 to 75 parts by weight of medium polyethylene and 25 to 75 parts by weight of low density polyethylene is composed of the inner layer forming composition.

In addition, to impart antistatic properties to the polyethylene film, it may further include carbon nanotubes in the inner layer. In this case, the inner layer forming composition is preferably composed of 0.1 to 10 parts by weight of carbon nanotubes, 30 to 60 parts by weight of low density polyethylene and 30 to 60 parts by weight of linear low density polyethylene. At this time, when the content ratio of carbon nanotubes to polyethylene is larger than that shown above, it is difficult to increase dispersibility, there is a problem of cost increase, and when it is lower, surface resistance is high, and antistatic property is lowered. There is this.

The carbon nanotubes are selected from the group consisting of single-walled carbon nanotubes, double-walled carbon nanotubes, multi-walled carbon nanotubes, bundled carbon nanotubes, and mixtures thereof.

The inner layer is a part which adheres or contacts the screen of the display product, which is an adhesive when the polyethylene film of the present invention is used for packaging the display product, and is a layer which prevents the screen of the display from being contaminated or adhered to foreign substances. In the present invention, by using a mixture of medium-density polyethylene, or medium-density polyethylene and other low-density polyethylene or low-density polyethylene or linear low-density polyethylene in the inner layer to improve the slip properties and excellent wear resistance properties. Low-density polyethylene can maintain excellent film smoothness because of its good bubble stability during film molding, and can also increase thermal adhesive strength due to its low density. Linear low density polyethylene is somewhat inferior in bubble stability, but can maintain excellent film strength and maintain excellent heat bond strength. Medium density polyethylene has high density and excellent stiffness, resulting in high slip resistance and excellent wear resistance. Can be implemented.

As such, the polyethylene in the inner layer of the present invention is made of medium density polyethylene, or a combination of medium density polyethylene and linear low density polyethylene, whereby the moderate stiffness of the film can be increased to increase the tearing and wear resistance. In addition, it is possible to obtain the effect of increasing the low-temperature heat sealability and heat sealing strength during 3-way sealing.

The high density polyethylene has a melt index of 0.1 to 10 g / 10 min. And a density of 0.940 to 0.965 g / cm ³ .

The medium density polyethylene has a melt index of 0.1 to 10 g / 10 min. And a density of 0.926 to 0.945 g / cm ³ .

The linear low density polyethylene has a melt index of 0.1 to 10 g / 10 min. And a density of 0.910 to 0.925 g / cm ³ .

The low density polyethylene has a melt index of 0.3 to 10 g / 10 min. And a density of 0.918 to 0.925 g / cm ³ .

 The thickness of the nylon layer, aluminum layer, outer layer, middle layer and inner layer constituting the display product packaging film of the present invention is 5 to 30%, 5 to 30%, 10 to 50%, 25 to 70% and It is preferably 10 to 50%, more preferably 5 to 20%, 5 to 20, 15 to 30%, 35 to 60% and 15 to 30%, respectively.

When the thickness of each layer is out of the above range, it is difficult to maintain proper wear resistance, and also difficult to maintain adequately high stiffness, stiffness, and film properties, lamination properties, heat sealability, and the like.

It is preferable that the polyethylene film for product packaging of this invention is 30-100 micrometers in thickness.

The outer layer forming composition may further contain 10 to 40 parts by weight of the permanent antistatic agent. The outer layer forming composition may further include a permanent antistatic agent to impart antistatic properties to the outer surface of the film to attach to the display screen, or to prevent dust and foreign matter from sticking to the outside in the packaged state, thereby preventing contamination of the film and Has the advantage of maintaining luxury. Such permanent antistatic agents are not particularly limited as long as they are used in the art, and non-limiting examples include Igastate-P (Irgastat-P, BASF), Pevax, Arkma, IPE, Ionphase, Entira (Dentira, Dupont) and the like, such a permanent antistatic agent does not have a transition phenomenon, has the advantage of maintaining the antistatic properties for a long time.

In addition, the outer layer forming composition, the middle layer forming composition and the inner layer forming composition has an anti-oxidant (Anti-oxidant) to prevent decomposition of the polyethylene resin (Polyethylene Resin) by high heat during film molding 0.01 to 100 parts by weight of each composition It may further be added in an amount of 0.5 parts by weight. In addition to the lubricant and neutralizing agent may be further added in an amount of 0.01 to 0.1 parts by weight relative to 100 parts by weight of each composition.

Moreover, the manufacturing method of the polyethylene film for display product packaging of this invention,

And coextruding the outer layer forming composition containing 100 parts by weight of polyethylene, the middle layer forming composition containing 100 parts by weight of polyethylene, and the inner layer forming composition containing 100 parts by weight of polyethylene.

The co-extrusion is preferably using a three-layer extruder.

This requires a lot of equipment investment compared to a mono layer extruder, and film molding is somewhat difficult, but in the case of a functional film like the display screen protection film of the present invention, it is more preferable to use a triple and multiple extruders to impart functionality to each layer. Because.

The display product packaging film of the present invention optionally further contains carbon nanotubes (CNT) in the inner layer to impart a permanent antistatic property even in a small amount to prevent the incorporation of foreign objects and dust, and also prevent migration from occurring. This gives a function that does not cause poll-dirty.

In addition, in the case of the inner layer of the packaging film for display products, in order to enhance the stiffness and heat-sealing properties of the film itself, considering the density characteristics of the polyethylene, only medium density polyethylene and low density polyethylene are used as 1: It is preferable to compose it so that it may contain in the weight ratio of 3-3: 1, or to contain medium density polyethylene and linear low density polyethylene in the weight ratio of 1: 3-3: 1.

In addition, in the case of the middle layer of the display screen protection film of the present invention, in order to improve the stiffness and heat-sealing properties of the film itself, low density polyethylene and linear low density polyethylene are used in consideration of the density characteristics of polyethylene 1: 3 to 3 :: Or to contain low density polyethylene, linear low density polyethylene, and high density polyethylene in a weight ratio of 2: 2: 1 or 3: 4: 4,

In addition, in the case of the outer layer of the packaging film for display products of the present invention, in order to improve the stiffness and heat-sealing properties of the film itself, low density polyethylene and linear low density polyethylene are selected in consideration of the density characteristics of polyethylene. It was made to contain in the weight ratio of 1.

The three-layer composition is coextruded to produce a three-layer polyethylene film, and then the nylon film and the aluminum thin film are laminated. In general, a dry lamination method is widely used as the lamination method. An acrylic or urethane adhesive dissolved in an organic solvent is first applied to a nylon film to be laminated with an aluminum film. . An adhesive is again applied to the aluminum part in the above-mentioned film in which nylon and aluminum are laminated (called paper 1), and laminated with the outer layer part of the polyethylene film (called paper 2) of the present invention.

Through consideration of each layer, the thermal characteristic gradient between layers was adjusted, which enhances low temperature heat sealability and heat seal strength in three-way heat sealing required for the production of packaging bags, and prevents heat deformation of the outer layer to prevent commercialization of the film. To promote it.

In addition, when the density, melt index, processing temperature (160 to 240 ° C.), and layer ratio of the polyethylene resin for each layer cannot be properly maintained, the appearance of the film, the deterioration of the film properties, and the curling phenomenon (Curling) , A phenomenon in which the film dries) occurs, which results in inferior commerciality as a packaging film.

In addition, a packaging bag may be manufactured using the polyethylene film for display packaging of the present invention, which may be obtained by manufacturing a conventional bag manufacturing process using the polyethylene film of the present invention described above.

Hereinafter, the present invention will be described in more detail with reference to Examples and Experimental Examples, but these Examples and the like are for illustrative purposes only and should not be construed as limiting the protection scope of the present invention.

Example  And Experimental Example

Example  One

Medium Density Polyethylene (melt index 1.0 g / 10min, Density 0.940 g / cm ³ , RF 5000R, denoted as “MDPE” in the table below) 25 wt% and Low Density Polyethylene (melt index 2.0 g / 10min, Density 0.923 g / cm ³ , LG BF 415, represented by "LDPE" in the following table) 75% by weight of the mixture is prepared and dispersed to prepare an inner layer forming composition,

50 weight percent low density polyethylene (LDPE, melt index 2.0 g / 10 min, density 0.923 g / cm ³ , LG BF 415) and 50 weight linear low density polyethylene (melt index 1.0 g / 10 min, density 0.920 g / cm ³ , LG SP310) Mixing and dispersing the% to prepare a stratified composition,

50 weight percent low density polyethylene (LDPE, melt index 2.0 g / 10 min, density 0.923 g / cm ³ , LG BF 415) and 50 weight linear low density polyethylene (melt index 1.0 g / 10 min, density 0.920 g / cm ³ , LG SP310) After mixing and dispersing the% to prepare the outer layer forming composition,

A polyethylene film was prepared by coextrusion using a triple extruder using the three compositions. The thickness of the produced film was 50 μm, and the thickness ratio of the inner layer, the middle layer, and the outer layer was 1: 2: 1. Nylon (12-15 μm) and aluminum film (6-12 μm) were laminated on the outer layer of the prepared film by dry lamination to prepare a polyethylene film in which aluminum was laminated.

Example  2 to 5

Except for preparing the inner layer forming composition, the middle layer forming composition and the outer layer forming composition according to the composition according to Table 1 below to produce a polyethylene film laminated with aluminum in the same manner as in Example 1. The figures in parentheses in the tables are in weight percent.

Comparative example  One

Low density polyethylene (melting index 1.0 g / 10 min., Density 0.923 g / cm ³ , LG BF 315) and linear low density polystyrene (melting index 1.0 g / 10 min., Density 0.920 g / cm ³ , Hunan UL314) and high density polyethylene (Melting index 0.8 g / 10 min., Density 0.950 g / cm ³ , LG PM360) The product was mixed in a weight ratio of 1: 3: 1 to prepare a packaging film of Comparative Example 1 in a single screw extruder.

Experimental Example  One

For Examples 1 to 5 and Comparative Example 1, the coefficient of friction was determined as the average value after five repeated measurements according to ASTM D 150 standards.

Pole-Dirty exposed the film for 72 hours at 80 ° C. and 90% humidity conditions, then attached it to the display screen and artificially applied a constant load on the film to determine contamination on the surface condition of the screen.

The scratch resistance is determined by scratching the surface of the screen by attaching the film to the display screen and then rotating the weight with a constant load. At this time, the weight of the weight is gradually increased, and the weight of the weight Weight.

Tensile strength and elongation were measured according to the ASTM D 882 standard.

Stiffness is made of a film of 25mm in width, 100mm in length, and then bending the specimen in an oval shape and expressing the weight with constant enduring force.

Heat sealing strength was 120 ~ 150 ℃, after the heat-bonding under a time of about 1 second, the degree of peeling was visually confirmed.

Fish-eye randomly cut the film into 1 m horizontally and vertically to determine the number of fish-eyes. The results are summarized in Table 2 below.

Referring to the above results, in terms of elongation and heat-sealing strength, it can be seen that Examples 1 to 5 of the present invention have almost the same results as Comparative Example 1, but the coefficient of friction is low and excellent slip performance In addition, it was confirmed that the foldability and scratch resistance were excellently improved. In addition, in terms of tensile strength, it can be seen that Examples 1 to 5 of the present invention show a similar or even better effect than Comparative Example 1.

Example  6

Low Density Polyethylene (melt index 2.0 g / 10min, Density 0.923 g / cm ³ , LG BF 415, indicated below as "LDPE") 48 wt%, Linear Low Density Polyethylene (melt index 1.0 g / 10min, Density 0.920 g / cm ³ , LG SP310, represented by "LLDPE" in the following table) 48% by weight, 4% by weight of carbon nanotubes were mixed and dispersed to prepare an inner layer forming composition,

Low density polyethylene (LDPE, melt index 2.0 g / 10 min, density 0.923 g / cm ³ , LG BF 415) 50% by weight and linear low density polyethylene (melt index 1.0 g / 10 min, density 0.920 g / cm ³ , LG SP 310) 50 Mixing and dispersing the wt% to prepare a layer forming composition,

50 weight percent low density polyethylene (LDPE, melt index 2.0 g / 10 min, density 0.923 g / cm ³ , LG BF 415) and 50 weight linear low density polyethylene (melt index 1.0 g / 10 min, density 0.920 g / cm ³ , LG SP310) After mixing and dispersing the% to prepare the outer layer forming composition,

A polyethylene film was prepared by coextrusion using a triple extruder using the three compositions. The thickness of the produced film was 50 μm, and the thickness ratio of the inner layer, the middle layer, and the outer layer was 1: 2: 1. Nylon (12-15 μm) and aluminum film (6-12 μm) were laminated on the outer layer of the prepared film by dry lamination to prepare a polyethylene film in which aluminum was laminated.

Example  7 to 10

Except for preparing the inner layer forming composition, the middle layer forming composition and the outer layer forming composition according to the composition according to Table 3 below to produce a polyethylene film laminated with aluminum in the same manner as in Example 6. The figures in parentheses in the tables are in weight percent.

Experimental Example  2

For Examples 5 to 10 and Comparative Example 1 described above, the surface resistance (ASTM D257-93) measured the resistivity of the film.

Pole-dirty, scratch resistance, tensile strength, elongation, stiffness, and heat seal strength were measured in the same manner as in Experimental Example 1. The results are summarized in Table 4 below.

Referring to the above results, in terms of stiffness and heat-sealing strength, it can be seen that Examples 6 to 10 of the present invention have almost the same results as in Comparative Example 1, and the pole-dirty, scratch resistance and tensile strength In terms of aspects, it can be seen that Examples 6 to 10 of the present invention exhibit excellent effects compared to Comparative Example 1.

Claims (6)

It consists of a polyethylene layer consisting of three layers of an outer layer, a middle layer and an inner layer, and an aluminum layer and a nylon layer laminated to the outer layer,
The outer layer consists of an outer layer forming composition containing low density polyethylene and linear low density polyethylene,
The middle layer is made of a middle layer forming composition containing at least two selected from the group consisting of low density polyethylene, linear low density polyethylene, and high density polyethylene, and
The inner layer is a polyethylene film for display product packaging, characterized in that made of an inner layer forming composition containing at least one selected from the group consisting of medium density polyethylene, low density polyethylene and linear low density polyethylene. The method of claim 1,
The outer layer forming composition is to contain 25 to 75 parts by weight of low density polyethylene and 25 to 75 parts by weight of linear low density polyethylene,
The intermediate layer composition may contain 25 to 75 parts by weight of low density polyethylene and 25 to 75 parts by weight of linear low density polyethylene, or 25 to 50 parts by weight of low density polyethylene, 25 to 50 parts by weight of linear low density polyethylene and 25 to 50 parts by weight of high density polyethylene. It is to contain,
The inner layer forming composition is composed of 100 parts by weight of medium polyethylene, or 25 to 75 parts by weight of medium polyethylene and 25 to 75 parts by weight of low density polyethylene, characterized in that the polyethylene film for packaging packaging. The thickness of the aluminum layer, nylon layer, outer layer, middle layer and inner layer is 5 to 30%, 5 to 30%, 10 to 50%, 25% to 70% and the total thickness of the entire polyethylene film, respectively. Polyethylene film for display product packaging, characterized in that 10 to 50%. The method of claim 1, wherein the high density polyethylene has a melt index of 0.1 to 10 g / 10 min., Density of 0.940 to 0.965 g / cm ³ ego,
The medium density polyethylene has a melt index of 0.1 to 10 g / 10 min., A density of 0.926 to 0.945 g / cm ³ ,
The linear low density polyethylene has a melt index of 0.1 to 10 g / 10 min. And a density of 0.910 to 0.925 g / cm ^3. And
The low density polyethylene has a melt index of 0.3 to 10 g / 10 min. And a density of 0.918 to 0.925 g / cm ³ . The method of claim 1,
The inner layer forming composition further comprises carbon nanotubes, and contains 0.1 to 10 parts by weight of carbon nanotubes, 30 to 60 parts by weight of low density polyethylene, and 30 to 60 parts by weight of linear low density polyethylene. A display product packaging bag comprising the polyethylene film for display product packaging according to any one of claims 1 to 5.