KR102266911B1 - Composite cushion tape with adjacent electromagnetic shielding layer and adhesive tape layer and method of preparing the same - Google Patents

Abstract

The present invention relates to a composite cushion tape with an electromagnetic wave shielding layer and an adhesive tape layer adjacently disposed and a manufacturing method thereof. The composite cushion tape has an electromagnetic wave shielding and absorbing function by comprising the electromagnetic wave shielding layer and an absorbing layer, and has a cushioning function by providing with a heat dissipation function and comprising a polyurethane layer.

Description

COMPOSITE CUSHION TAPE WITH ADJACENT ELECTROMAGNETIC SHIELDING LAYER AND ADHESIVE TAPE LAYER AND METHOD OF PREPARING THE SAME

The present invention relates to a composite cushion tape in which an electromagnetic wave shielding layer and an adhesive tape layer are adjacently disposed, and a method for manufacturing the same, wherein the composite cushion tape has an electromagnetic wave shielding and absorbing function by including an electromagnetic wave shielding layer and an absorbing layer, and has a heat dissipation function And, it is characterized in that it has a buffer function by including a polyurethane layer.

The multifunctionality, lightness, and compactness of electronic devices in the IT industry and the automobile industry made it possible to mount parts at high density and raise the operating frequency to a high frequency band. Accordingly, electromagnetic interference between parts, malfunctions due to noise, and signal quality degradation have emerged as important issues.

Meanwhile, the harmfulness of electromagnetic waves to the human body is also emerging as a social problem. With the recent announcement of the World Health Organization (WHO) that cell phones have the potential to cause cancer, regulations on the harmfulness of electromagnetic waves are being gradually strengthened in developed countries.

Therefore, it has become very important to control the amount of unnecessary electromagnetic wave emission of electronic devices below a certain level and to create a comfortable electromagnetic wave compatibility environment that does not cause malfunction even when a strong electromagnetic wave comes from the outside.

Recently, with the high quality and miniaturization of portable terminals such as smart phones or tablet PCs, and digital devices such as LED TVs, the line width of circuit modules has been reduced and high integration has been achieved. In addition, the market is rapidly growing due to the smartization of electronic devices including wearables and the Internet of Things (IoT), and the demand for electromagnetic compatibility is rapidly increasing.

Therefore, the electromagnetic wave shielding function is also used in adhesive tapes and gaskets that can attach electronic components of digital devices and portable terminals and protect them from external impacts.

In general, copper, silver, nickel, etc. are used as a material for shielding electromagnetic waves. In particular, copper is widely used as a shielding material because it is cheaper and safer than other materials. However, silver, nickel, etc. are expensive and have limitations in their application as electromagnetic wave shielding materials because of their oxidation properties. In addition, in the case of an adhesive tape having an electromagnetic wave shielding function using the same, there are many cases in which the function is damaged due to an external impact, and many studies are being conducted to solve the problem.

Therefore, while the present inventors were researching to solve the above problems, when a composite cushion tape is manufactured by combining an adhesive tape layer, an electromagnetic wave shielding layer, an electromagnetic wave absorbing layer and a polyurethane layer, the composite cushion tape is electromagnetic wave shielding and The present invention was completed by discovering that it can have a heat dissipation function and a buffer function as well as an absorption function.

In this regard, Korean Patent Registration No. 10-0567739 discloses an aluminum mylar tape capable of shielding electromagnetic waves and static electricity.

The present invention has been devised to solve the problems of the prior art, and an object of the present invention is to provide a composite cushion tape in which an electromagnetic wave shielding layer is disposed adjacent to an adhesive tape layer.

Another object of the present invention is to provide a method for manufacturing the composite cushion tape.

As a technical means for achieving the above-described technical problem, an aspect of the present invention is

An adhesive tape layer having one side adhered to the surface of the electronic product; an electromagnetic wave shielding layer disposed on the other side of the adhesive tape layer and including a metal foil; an electromagnetic wave absorbing layer disposed on the shielding layer; and a polyurethane foam layer disposed on the absorbent layer.

The thickness of the adhesive tape layer may be 0.01 mm to 0.05 mm.

The electromagnetic wave shielding layer may have a thickness of 0.01 mm to 0.05 mm.

The metal foil included in the electromagnetic wave shielding layer may be an aluminum (Al) or copper (Cu) foil.

The metal foil may exhibit a shielding effect of 80 dB or more in a frequency band of 0 GHz to 6 GHz.

The electromagnetic wave absorbing layer may include a magnetic powder and a synthetic resin.

The content of the synthetic resin may be 5 to 10 parts by weight based on 100 parts by weight of the magnetic powder.

The electromagnetic wave absorbing layer may further include a material selected from the group consisting of modifiers, calcium carbonate, antioxidants, lubricants, and combinations thereof.

The electromagnetic wave absorbing layer may have a thickness of 0.07 mm to 3.0 mm.

The thickness of the polyurethane foam layer may be 0.07 mm to 1.5 mm.

The composite cushion tape may further include an adhesive layer for bonding them between the electromagnetic wave shielding layer and the electromagnetic wave absorbing layer.

In addition, another aspect of the present invention,

Preparing an electromagnetic wave absorbing layer by mixing and molding a raw material including a magnetic powder and a synthetic resin; attaching an adhesive layer to one surface of the electromagnetic wave absorbing layer; attaching one surface of the electromagnetic wave shielding layer including a metal foil to the adhesive layer with the adhesive layer interposed therebetween; attaching an adhesive tape layer to the other surface of the electromagnetic wave shielding layer; and attaching a polyurethane foam layer to the other surface of the electromagnetic wave absorbing layer.

The molding of the raw material including the magnetic powder and the synthetic resin may be performed by hot pressing at a temperature of 150°C to 230°C.

The composite cushion tape according to the present invention as described above may have an electromagnetic wave shielding and absorbing function by including an electromagnetic wave shielding layer and an electromagnetic wave absorbing layer, as well as a heat dissipation function by the metal foil included in the electromagnetic wave shielding layer.

In addition, since the composite cushion tape includes a polyurethane foam layer as the outermost layer, it may also be capable of providing a buffer function that can safely protect an applied device or component (skin attachment) such as an electronic product from external impact.

1 is a schematic view showing a composite cushion tape according to an embodiment of the present invention.
2 is a schematic view showing a composite cushion tape according to another embodiment of the present invention.
3a and 3b are graphs showing the shielding effect of the aluminum foil according to an embodiment of the present invention, respectively.
4A and 4B are graphs showing reflection loss for each thickness of an electromagnetic wave absorbing layer at a magnetic permeability of 30 according to an embodiment of the present invention, respectively.
5A and 5B are graphs showing reflection loss for each thickness of the electromagnetic wave absorbing layer at magnetic permeability 50 and 100, respectively, according to an embodiment of the present invention.
6 is a graph showing the magnetic permeability and the permeability loss coefficient according to the frequency increase according to the thickness of the electromagnetic wave absorbing layer according to an embodiment of the present invention.

Hereinafter, the present invention will be described in more detail. However, the present invention may be embodied in various different forms, and the present invention is not limited by the embodiments described herein, and the present invention is only defined by the claims to be described later.

In addition, the terminology used in the present invention is only used to describe specific embodiments, and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the entire specification of the present invention, 'including' any component means that other components may be further included, rather than excluding other components, unless otherwise stated.

The first aspect of the present application is

an adhesive tape layer 100 having one side adhered to the surface of the electronic product; an electromagnetic wave shielding layer 200 disposed on the other side of the adhesive tape layer 100 and including a metal foil; an electromagnetic wave absorbing layer 300 disposed on the shielding layer 200; and a polyurethane foam layer 400 disposed on the absorbent layer 300; provides a composite cushion tape comprising.

Hereinafter, the composite cushion tape according to the first aspect of the present application will be described in detail with reference to FIGS. 1 and 2 .

In one embodiment of the present application, the composite cushion tape may include an adhesive tape layer 100 having one side adhered to the surface of the electronic product. In this case, it should be understood that the electronic product includes any electronic device that emits electromagnetic waves. On the other hand, the thickness of the adhesive tape layer 100 may be 0.01 mm to 0.05 mm, and the material is not limited as long as it exhibits adhesive properties, but a general acrylic material including PET backing may be preferably used.

In one embodiment of the present application, the composite cushion tape may be disposed on the other side of the adhesive tape layer 100 and include an electromagnetic wave shielding layer 200 including a metal foil. In this case, the thickness of the electromagnetic wave shielding layer 200 may be 0.01 mm to 0.05 mm. Meanwhile, the electromagnetic wave shielding layer 200 may further include a metal alloy powder, metal-coated graphite, metal fiber, etc. in addition to the metal foil, and the metal foil is preferably an aluminum (Al) or copper (Cu) foil. may be In addition, the thickness of the metal foil may be about 0.01 mm to 0.05 mm, and may further include a PET or PU (polyurethane) layer to prevent tearing thereof when an aluminum foil is used.

In one embodiment of the present application, the aluminum foil may exhibit a horizontal thermal conductivity of about 80 W/mK to 100 W/mK, and the copper foil may exhibit a horizontal thermal conductivity of about 200 W/mK or more. In addition, the metal foil may exhibit an electromagnetic wave shielding effect of about 80 dB or more in a frequency band of 0 to 6 GHz.

In one embodiment of the present application, the composite cushion tape may include an electromagnetic wave absorbing layer 300 disposed on the shielding layer 200 . In this case, the thickness of the electromagnetic wave absorbing layer 300 may be 0.07 mm to 3.0 mm. Meanwhile, the electromagnetic wave absorbing layer 300 may include, in addition to the synthetic resin, metal powder, metal alloy powder, magnetic alloy, magnetic powder, carbonyl-iron powder, ferrite or iron-silicide, etc., preferably It may include a magnetic powder. At this time, the magnetic powder may be preferably sandust (Fe85%-Si9%-Al6%), and the synthetic resin may be a thermoplastic polyurethane (TPU) resin. In addition, the content of the synthetic resin may be 5 to 10 parts by weight based on 100 parts by weight of the magnetic powder, preferably 6 to 8 parts by weight, more preferably 7 to 8 parts by weight. have. When the content of the synthetic resin is less than 5 parts by weight relative to 100 parts by weight of the magnetic powder, the content of the synthetic resin is relatively small, so the dispersion stability of the magnetic powder may be lowered, and when it exceeds 10 parts by weight, the content of the magnetic powder is relatively small The electromagnetic wave absorption effect may be reduced. In that the material included in the electromagnetic wave absorbing layer 300 can absorb electromagnetic waves and transform them into other energy forms such as heat, the electromagnetic wave shielding layer 200 having the characteristic of flowing the electromagnetic waves to the other side. It may be distinguished from the material included in the .

Meanwhile, the electromagnetic wave absorbing layer 300 may further include a material selected from the group consisting of a coupling agent, a modifier, calcium carbonate, an antioxidant, a lubricant, and combinations thereof, in addition to the material. In this case, the content of the coupling agent may be 0.2 parts by weight to 0.3 parts by weight based on 100 parts by weight of the magnetic powder, and the modifier may be stearic acid, and the content thereof is 2 parts by weight to 3 parts by weight compared to 100 parts by weight of the magnetic powder. It may be parts by weight. In addition, the content of the calcium carbonate may be 0.3 parts by weight to 0.4 parts by weight based on 100 parts by weight of the magnetic powder. In addition, the antioxidant may be tetrakis[methylene-3-(3,5-tert-butyl-4-hydroxyphenyl)propionate]methane, which is a phenolic antioxidant, and the content is 100 weight of the magnetic powder It may be 0.1 parts by weight to 0.2 parts by weight based on parts. In addition, the lubricant may be an ester-based material, and the content may be 0.1 to 0.2 parts by weight based on 100 parts by weight of the magnetic powder.

In one embodiment of the present application, the electromagnetic wave absorbing layer 300 may have a complex magnetic permeability of about 30 to 100 depending on the type or content of the magnetic powder, and the absorption performance frequency range is 1 MHz to 3 GHz, and the electromagnetic wave absorbing layer It may exhibit absorption performance (electromagnetic wave return loss) of about 1 dB to 10 dB depending on the thickness of the .

In one embodiment of the present application, the composite cushion tape may include a polyurethane foam layer 400 disposed on the absorbent layer 300 . That is, the composite cushion tape has a buffering effect by including the polyurethane foam layer 400 formed in the outermost direction in the opposite direction to the adhesive tape layer 100 that is adhered to the electronic product, so that it is caused by an external physical impact, such as electronic It may be to prevent problems such as damage to the applied device or parts (attached to the skin). Specifically, the polyurethane is a polymer material known as an elastomer, and since it forms a linear structure rather than cross-linking, it may be very flexible. In addition, it has elasticity even at a low molecular weight, does not require a separate additive, and may have excellent rebound elasticity or abrasion resistance. Accordingly, the polyurethane foam including the polyurethane having the above characteristics may maximize the buffering effect from external physical impact. On the other hand, the thickness of the polyurethane foam layer 400 may be 0.07 mm to 1.5 mm.

In one embodiment of the present application, the composite cushion tape may further include an adhesive layer 250 between the electromagnetic wave shielding layer 200 and the electromagnetic wave absorbing layer 300 to adhere them. A schematic diagram for this is shown in FIG. 2 . That is, by further including an adhesive layer 250 between the electromagnetic wave shielding layer 200 and the electromagnetic wave absorbing layer 300 , the two layers may be more tightly stacked. In this case, the adhesive layer 250 is not particularly limited as long as it is a material exhibiting adhesive properties like the adhesive tape layer 100 , but a general acrylic material including PET backing may be preferably used.

In one embodiment of the present application, the composite cushion tape may include an electromagnetic wave shielding layer and an electromagnetic wave absorbing layer to have an electromagnetic wave shielding and absorbing function as well as a heat dissipation function by a metal foil included in the electromagnetic wave shielding layer. In addition, since the composite cushion tape includes a polyurethane foam layer as the outermost layer, it may also be capable of providing a buffer function that can safely protect an applied device or component (skin attachment) such as an electronic product from external impact.

The second aspect of the present application is

Mixing a raw material containing a magnetic powder and a synthetic resin, molding the step of manufacturing the electromagnetic wave absorption layer (300); attaching an adhesive layer 250 to one surface of the electromagnetic wave absorbing layer 300; attaching one surface of the electromagnetic wave shielding layer 200 including a metal foil to the adhesive layer 250 with the adhesive layer 250 interposed therebetween; attaching the adhesive tape layer 100 to the other surface of the electromagnetic wave shielding layer 200; and attaching a polyurethane foam layer 400 to the other surface of the electromagnetic wave absorbing layer 300; provides a method of manufacturing a composite cushion tape comprising a.

Although detailed descriptions of parts overlapping with the first aspect of the present application have been omitted, the contents described with respect to the first aspect of the present application may be equally applied even if the description thereof is omitted from the second aspect.

Hereinafter, the manufacturing method of the composite cushion tape according to the second aspect of the present application will be described in detail step by step.

First, in one embodiment of the present application, the manufacturing method of the composite cushion tape may include; mixing a raw material including a magnetic powder and a synthetic resin, and molding the mixture to prepare the electromagnetic wave absorbing layer 300 .

In one embodiment of the present application, the mixing ratio of the magnetic powder and the synthetic resin may be to mix 5 to 10 parts by weight of the synthetic resin relative to 100 parts by weight of the magnetic powder, preferably 6 to 8 parts by weight. The amount may be mixed, and more preferably, it may be mixed by 7 to 8 parts by weight. When the mixing content of the synthetic resin is less than 5 parts by weight compared to 100 parts by weight of the magnetic powder, the content of the synthetic resin is relatively small, so the dispersion stability of the magnetic powder may be lowered, and when it exceeds 10 parts by weight, the content of the magnetic powder is relatively It may be that the electromagnetic wave absorption effect is reduced.

In one embodiment of the present application, the raw material may include, in addition to the magnetic powder, metal powder, metal alloy powder, magnetic alloy, magnetic powder, carbonyl-iron powder, ferrite or iron-silicide, etc., The magnetic powder may preferably be sandust (Fe85%-Si9%-Al6%). In addition, the synthetic resin may be a thermoplastic polyurethane (TPU) resin. In addition, the raw material may further include a material selected from the group consisting of a coupling agent, modifier, calcium carbonate, antioxidant, lubricant, and combinations thereof in addition to the magnetic powder and synthetic resin.

In one embodiment of the present application, the mixing of the raw materials may be preferably mixed using a Kneeder machine, and the molding may be performed at a temperature of 150° C. to 230° C. using a roll calendar (heat press). Meanwhile, the thickness of the electromagnetic wave absorbing layer 300 manufactured as described above may be 0.07 mm to 3.0 mm.

Next, in one embodiment of the present application, the manufacturing method of the composite cushion tape may include the step of attaching the adhesive layer 250 to one surface of the electromagnetic wave absorbing layer 300 .

In one embodiment of the present application, the adhesive layer 250 may be used to more firmly attach the electromagnetic wave shielding layer 200 to be described later with the electromagnetic wave absorbing layer 300 . In this case, the material of the adhesive layer 250 is not particularly limited as long as it exhibits adhesive properties, but a general acrylic material including PET backing may be preferably used.

Next, in one embodiment of the present application, in the method of manufacturing the composite cushion tape, one surface of the electromagnetic wave shielding layer 200 including a metal foil with the adhesive layer 250 interposed between the adhesive layer ( 250) and attaching to it.

In one embodiment of the present application, the attachment of the electromagnetic wave shielding layer 200 may be performed by laminating, and the material may further include metal alloy powder, metal-coated graphite, metal fiber, etc. in addition to the metal foil. and the metal foil may be preferably an aluminum (Al) or copper (Cu) foil. In addition, the thickness of the metal foil may be about 0.01 mm to 0.05 mm, and may further include a PET or PU (polyurethane) layer to prevent tearing thereof when an aluminum foil is used. Meanwhile, the thickness of the electromagnetic wave shielding layer 200 may be 0.01 mm to 0.05 mm.

Next, in one embodiment of the present application, the manufacturing method of the composite cushion tape may include a step of attaching the adhesive tape layer 100 to the other surface of the electromagnetic wave shielding layer 200 .

In one embodiment of the present application, the attachment of the adhesive tape layer 100 may be performed by directly coating the electromagnetic wave shielding layer 200, and the material is not limited as long as it exhibits adhesive properties, but preferably PET Backing It may be to use a general acrylic material containing. In addition, the thickness of the adhesive tape layer 100 attached as described above may be 0.01 mm to 0.05 mm.

Next, in one embodiment of the present application, the manufacturing method of the composite cushion tape may include; attaching the polyurethane foam layer 400 to the other surface of the electromagnetic wave absorbing layer 300 .

In one embodiment of the present application, the attachment of the polyurethane foam layer 400 is specifically, the product to which the electromagnetic wave absorbing layer 300 is attached is a carrier of the foam line so that the other surface of the electromagnetic wave absorbing layer 300 faces upward. It may be put into a furnace, coated with polyurethane foam on the other side thereof, dried by IR, and coated by irradiating UV. On the other hand, the thickness of the polyurethane foam layer 400 may be 0.07 mm to 1.5 mm.

Hereinafter, embodiments of the present invention will be described in detail so that those of ordinary skill in the art can easily carry out the present invention. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein.

Example . Manufacture of composite cushion tape

1. Preparation of electromagnetic wave absorbing layer

For the preparation of the electromagnetic wave absorbing layer, the raw materials shown in Table 1 below were first mixed using a Kneeder machine, and then molded at a temperature of 150° C. to 230° C. using a roll calendar (heat press) to prepare an electromagnetic wave absorbing layer. At this time, the thickness of the prepared electromagnetic wave absorbing layer was about 0.07 mm to 3.0 mm.

[Table 1]

2. adhesive layer laminating

Thereafter, an adhesive layer was laminated on one side of the electromagnetic wave absorbing layer prepared in 1., and the thickness of the adhesive layer laminated on one side was about 0.005 mm to 0.015 mm, and the material used was a general acrylic material including PET backing. did.

3. Electromagnetic wave shielding layer laminating

Then, one side of the electromagnetic wave shielding layer was laminated to the adhesive layer laminated on one side of the electromagnetic wave absorbing layer in 2., and the thickness of the laminated electromagnetic wave shielding layer was about 0.01 mm to 0.05 mm. On the other hand, aluminum (Al) or copper (Cu) foil with a thickness of about 0.01 mm to 0.05 mm was used as the material of the electromagnetic wave shielding layer, and a PET or PU (polyurethane) layer was added to prevent tearing when using aluminum foil. mixed with

4. adhesive tape layer coating

Thereafter, an adhesive tape layer was coated on the other surface of the electromagnetic wave shielding layer, and this was performed by directly coating the other surface of the electromagnetic wave shielding layer with a general acrylic material including PET backing.

5. Polyurethane layer coating

In order to coat the polyurethane layer on the other surface of the electromagnetic wave absorbing layer prepared in 1. above, a polyurethane foam raw material was first prepared, and this was applied to the other surface of the electromagnetic wave absorbing layer. Specifically, after putting the product prepared in 4. above into the carrier of the foam line, the polyurethane foam raw material was directly applied to the other surface of the electromagnetic wave absorbing layer of the product. After that, after drying it by IR, a composite cushion tape was prepared by coating it through UV irradiation.

Experimental example 1. Measurement of shielding effect of electromagnetic wave shielding layer

The shielding effect of the aluminum electromagnetic wave shielding layer prepared in the above example was measured, and the results are shown in FIGS. 3A and 3B. As shown in Figures 3a and 3b, it was confirmed that the aluminum electromagnetic shielding layer prepared in the embodiment of the present invention exhibited a shielding effect of about 80 dB or more in the frequency range of 0 to 6,000 MHz.

On the other hand, it was confirmed that the aluminum foil used for the electromagnetic wave shielding layer exhibited a horizontal thermal conductivity of about 80 W/mK to 100 W/mK, and the copper foil exhibited a horizontal thermal conductivity of about 200 W/mK or more. Therefore, it was confirmed that the composite cushion tape including the same can have a heat dissipation function because it exhibits high horizontal thermal conductivity as described above.

Experimental example 2. Measurement of reflection loss of the electromagnetic wave absorbing layer

The reflection loss according to the magnetic permeability and thickness of the electromagnetic wave absorbing layer prepared in the above example was measured, and the results are shown in FIGS. 4 and 5 .

4a and 4b show the reflection loss according to the thickness of the electromagnetic wave absorbing layer at the magnetic permeability of 30. First, FIG. 4a shows the reflection loss of the electromagnetic wave absorbing layer according to the thickness of 0.1 mm to 0.5 mm, and FIG. 4b is the thickness of 0.8 mm to 3.0 mm. The reflection loss of the electromagnetic wave absorbing layer is shown respectively.

First, in the range of 0.1 mm to 0.5 mm in thickness, it was confirmed that the reflection loss increases as the thickness of the electromagnetic wave absorbing layer increases as shown in FIG. 4a, and it can be confirmed that the reflection loss increases as the frequency increases in all thickness ranges. there was.

In addition, in the range of 0.8 mm to 3.0 mm in thickness, as shown in FIG. 4b , it was found that at a certain frequency (about 1 GHz or less), the return loss greatly increased as the thickness increased, and the resonance frequency of each thickness It was confirmed that the return loss (absorption performance) gradually decreased in the frequency band exceeding .

On the other hand, FIGS. 5A and 5B show the reflection loss for each thickness of the electromagnetic wave absorbing layer at the magnetic permeability of 50 and 100, respectively, and in both cases, the reflection loss increases as the thickness increases within each resonant frequency, and each resonant frequency is It was confirmed that the return loss decreased in the frequency band exceeding the frequency band.

Experimental example 3. Measurement of permeability by thickness of the electromagnetic wave absorbing layer

The magnetic permeability and permeability loss coefficient according to the thickness of the electromagnetic wave absorbing layer prepared in Example were measured, and the results are shown in FIG. 6 and Table 2 (permeability by frequency and thickness).

[Table 2] Permeability by frequency and thickness

As shown in Table 2 and Figure 6, it was confirmed that the magnetic permeability of the electromagnetic wave absorbing layer prepared according to the present invention did not show a significant difference according to the thickness change due to the inherent physical properties of the material, and the type and mixing ratio of the powder used as a magnetic material It was confirmed that high permeability and low permeability were determined accordingly. In addition, it was confirmed that the magnetic permeability decreased in the frequency band where each permeability loss was increased.

100: adhesive tape layer
200: electromagnetic wave shielding layer
250: adhesive layer
300: electromagnetic wave absorption layer
400: polyurethane foam layer

Claims (13)

An adhesive tape layer having one side adhered to the surface of the electronic product;
an electromagnetic wave shielding layer disposed on the other side of the adhesive tape layer and including a metal foil;
an electromagnetic wave absorbing layer disposed on the shielding layer;
a polyurethane foam layer disposed on the absorbent layer; and
an adhesive layer between the electromagnetic wave shielding layer and the electromagnetic wave absorbing layer for bonding them;
including,
The adhesive tape layer and the adhesive layer are acrylic materials including PET backing,
The thickness of the adhesive tape layer is 0.01 mm to 0.05 mm, the thickness of the adhesive layer is 0.005 mm to 0.015 mm,
The electromagnetic wave absorbing layer is 90 wt% sandust (Fe85%-Si9%-Al6%), 7.00 wt% thermoplastic polyurethane (TPU), 0.20 wt% coupling agent, 0.10 wt% lubricant, 0.10 wt% antioxidant, 0.30 wt% calcium carbonate After mixing wt% and 2.30 wt% of the modifier using a Kneeder machine, it is manufactured by molding at a temperature of 150°C to 230°C using a roll calender,
The thickness of the electromagnetic wave absorbing layer is 0.1 mm to 3.0 mm,
The metal foil included in the electromagnetic wave shielding layer is an aluminum (Al) or copper (Cu) foil,
The metal foil will exhibit a shielding effect of 80 dB or more in the 0 GHz to 6 GHz frequency band,
The thickness of the polyurethane foam layer is a composite cushion tape of 0.07 mm to 1.5 mm.
delete delete delete delete delete delete delete delete delete delete Preparing an electromagnetic wave absorbing layer by mixing and molding a raw material including magnetic powder and synthetic resin;
attaching an adhesive layer to one surface of the electromagnetic wave absorbing layer;
attaching one surface of the electromagnetic wave shielding layer including a metal foil to the adhesive layer with the adhesive layer interposed therebetween;
attaching an adhesive tape layer to the other surface of the electromagnetic wave shielding layer; and
attaching a polyurethane foam layer to the other surface of the electromagnetic wave absorbing layer;
including,
The adhesive tape layer and the adhesive layer are acrylic materials including PET backing,
The thickness of the adhesive tape layer is 0.01 mm to 0.05 mm, the thickness of the adhesive layer is 0.005 mm to 0.015 mm,
The electromagnetic wave absorbing layer is 90 wt% sandust (Fe85%-Si9%-Al6%), 7.00 wt% thermoplastic polyurethane (TPU), 0.20 wt% coupling agent, 0.10 wt% lubricant, 0.10 wt% antioxidant, 0.30 wt% calcium carbonate After mixing wt% and 2.30 wt% of the modifier using a Kneeder machine, it is manufactured by molding at a temperature of 150°C to 230°C using a roll calender,
The thickness of the electromagnetic wave absorbing layer is 0.1 mm to 3.0 mm,
The metal foil included in the electromagnetic wave shielding layer is an aluminum (Al) or copper (Cu) foil,
The metal foil will exhibit a shielding effect of 80 dB or more in the 0 GHz to 6 GHz frequency band,
The thickness of the polyurethane foam layer is a method of manufacturing a composite cushion tape of 0.07 mm to 1.5 mm.
delete

Images