KR100828735B1 - Flexible heat generation sheet and method for manufacturing the same - Google Patents

Abstract

A flexible heat generation sheet and a method for manufacturing the same are provided to prevent a heat generation layer from being separated from a conductive adhesive layer by improving an adhesion force between the conductive adhesive and TPE(ThermoPlastic Elastomer) through a PET film. A flexible heat generation sheet includes an upper sheet and a lower sheet. The upper sheet as an outer cover includes an upper insulation layer. In the upper insulation layer, a TPE layer(11a) and a PET nonwoven layer(13) are sequentially stacked. The TPE layer is made of crystal thermoplastic resin of 15 to 50wt% and reforming elastomer of 50 to 85wt%. The lower sheet includes a lower insulation layer and a heat generation layer. In the lower insulation layer, a PET film layer(12) and a PET layer(11b) as an outer cover are stacked in order. In the heat generation layer, a primary conductive adhesive layer(14) on an upper part of the lower insulation layer, an electrode(15), and a secondary conductive adhesive layer(16) are stacked in order. The upper sheet and the lower sheet are combined by adhesive resin of an adhesive layer(17).

Description

Flexible heat generation sheet and method for manufacturing the same

The present invention relates to a flexible heating sheet and a method of manufacturing the same.

Thermoelastic elastomer (TPE) and polyethylene terephthalate (PET) nonwoven fabric of upper limb improve flexibility and surface feel, and polyethylene teletephthalate (PET) film of lower limb improves flexibility and can be easily unfolded. It is a heating sheet that has a non-slip function of the surface which is in contact with the floor by thermoplastic elastomer (TPE), and it is excellent in flexibility and surface feel. The present invention relates to a flexible heating sheet and a method of manufacturing the same, which can be applied to daily household goods.

In general, the heating sheet is manufactured by insulating laminating with a heat resistant polymer film after installing electrodes at both ends on a thin carbon layer heating element, which is called a planar heating element. Such a heating sheet can maximize the thermal efficiency by dissipating even heat over the entire sheet, and even if the film is partially damaged due to the characteristics of the heating sheet, there is no problem in the overall heating characteristics, so the bed can be used semi-permanently. It is widely used as daily necessities such as mats, duvets, cushions, and vests, and has been researched and developed in various ways as its demand increases.

As described above, in the case of a heating sheet used for household goods such as a bed mat, a blanket, a vest, and the like, a polyethylene terephthalate film layer 1a and a nonwoven fabric layer 2a are bonded to each other as shown in FIG. 1. Carbonized material in which the base 100, the upper limb 200 to which the polyethylene terephthalate film layer 1b and the nonwoven fabric layer 2b are bonded, and the braided wire 3 which is twisted and processed copper wire between the upper and lower limbs (4) are laminated ) Is a laminated structure, and when the heating sheet is embedded in a product such as an electric blanket or an electric blanket, the flexibility of the heating sheet is reduced by the braided wires (3) arranged at a predetermined interval inside the heating sheet. There are problems such as inconvenience in handling or storage.

On the other hand, in the case of the heating sheet used for the purpose other than the household goods or medical supplies, as shown in FIG. 2, two copper thin plates 1 having a predetermined thickness and width are coated with a conductive adhesive coating on one side thereof. To maintain an appropriate interval on top of the insulating film (2) and to bond; Applying a silver liquid phase (3) onto the copper foil (1) attached to the upper part of the insulating film (2) and drying for a predetermined time; The carbon liquid phase 7 is coated on the dried silver part 3 and dried to cover the entire surface of the copper foil 1, the silver part 3, and the carbon heating element 7 with the upper surface of the insulating film 9. The heating sheet is known to be treated and waterproofed, but the heating sheet is still less flexible due to the copper wire arranged therein, and still cannot solve the above problems.

Accordingly, the present applicant has filed a flexible heating sheet in Korea Patent Application No. 2006-77759 (filed on August 17, 2006) as a way to solve the above problems, but such a flexible heating sheet is shown in FIG. As described above, the laminated structure from the bottom is composed of a lower insulating layer made of a polyethylene terephthalate nonwoven fabric layer 11, a heat generating layer made of a conductive adhesive layer 13 and a silver paste layer 14, and a linear low density polyethylene film layer 12b. An upper insulating layer, and the lower insulating layer and the heating layer is a flexible heating sheet 10 bonded to the linear low density polyethylene film layer 12a, the upper insulating layer to absorb the induced current generated in the heating sheet The shielding layer 15 is laminated on the upper part of the upper part of the upper and lower insulating layers in order to further increase the insulation of the heating sheet. In order to manufacture the flexible heating sheet 10 by laminating the polyvinyl chloride resin or the polyurethane resin again to form the outer insulating layer 16, the manufacturing process is complicated because the laminated structure is complicated.

Therefore, the present invention is to solve the problems as described above, by improving the flexibility and surface feel by the thermoplastic elastomer (TPE) and polyethylene terephthalate (PET) non-woven fabric of the upper limbs, and the polyethylene terephthalate of the base material It is a heating sheet that has a non-slip function of the surface contacted with the floor by thermoplastic elastomer (TPE) while complementing the flexibility by (PET) film. To provide a flexible heating sheet and a method for manufacturing the same, which is characterized in that it can be applied to daily household goods such as bed mats, duvets, cushions and vests because of excellent surface feel.

In the present invention, a corona discharge treatment is applied to upper and lower portions of a polyethylene terephthalate (PET) film, and an ozone treatment is performed on a thermoplastic elastomer (TPE) to oxidize the surface to increase surface roughness (surface roughness), and By increasing the tension, the polyethylene terephthalate (PET) film is characterized in that the flexibility between the upper conductive adhesive and the lower thermoplastic elastomer (TPE) to increase the adhesion between the conductive adhesive layer, which is a heat generating layer, so as not to occur Another object is to provide a heat generating sheet and a method of manufacturing the same.

In the case of the conventional heating sheet, since the polyethylene terephthalate (PET) film is directly bonded to a layer made of another compound, the polyethylene terephthalate (PET) has low adhesiveness with other compounds, and thus the heating sheet is laminated for a long time. There was a problem that the sieves are separated from each other.

In addition, the present invention is the resin forming the outermost layer of the heat generating sheet, by complementing the disadvantages of the polyethylene terephthalate (PET) film or linear low-density polyethylene film that has been mainly used according to the conventional olefin-based thermoplastic elastomer, the surface of the outermost layer This softness improves the characteristics of flexibility while improving the functionality such as heat resistance and printability. Another object is to provide a heat generating sheet and a method of manufacturing the same.

Polyethylene terephthalate (PET) films used in the past are excellent in heat resistance and scratch resistance, but have disadvantages in terms of heat sealability and are not suitable for planar heating elements that use electricity due to their poor moisture permeability compared to olefinic plastics. In addition, the linear low-density polyethylene film has advantages in terms of electrical insulation, heat sealability, waterproofness, etc., but lacks scratchability and printability for use as the outermost layer, thereby reducing the product value as a product.

According to a feature of the present invention for achieving the above object, the present invention is a flexible heating sheet made of a laminate,

An upper layer composed of an upper insulating layer laminated in the order of an outer layer of thermoplastic elastomer (TPE) and a polyethylene terephthalate (PET) nonwoven layer thereunder;

A lower insulating layer laminated in the order of a polyethylene terephthalate (PET) film layer and a thermoplastic elastomer (TPE) layer under the shell, a primary conductive adhesive layer on the upper part of the lower insulating layer, and an electrode arranged on the upper part of the lower insulating layer; A base made of a heat generating layer laminated in the order of the primary conductive adhesive layer,

The upper and lower limbs are laminated by the adhesive resin of the adhesive layer, and the flexible heating sheet and its manufacturing method are the problem solving means.

The present invention having the above structure improves flexibility and surface feel by the thermoplastic elastomer (TPE) and the polyethylene terephthalate (PET) nonwoven fabric of the upper limb, and the flexibility of the polyethylene terephthalate (PET) film of the lower substrate. It is a heating sheet that has a non-slip function of the surface in contact with the floor by a thermoplastic elastomer (TPE) and at the same time, it can be easily unfolded, and the upper and lower parts of the polyethylene terephthalate (PET) film Corona discharge treatment on each surface, and ozone treatment on the thermoplastic elastomer (TPE) to oxidize the surface to increase the surface roughness (surface roughness) and to improve the surface tension, the polyethylene telephthalate (PET) film The adhesion between the upper conductive adhesive and the lower thermoplastic elastomer (TPE) is increased to separate the conductive adhesive layer, which is a heating layer. As a resin to form the outermost layer of the heating sheet, and to compensate for the disadvantages of the polyethylene terephthalate (PET) film or the linear low density polyethylene film, which has been mainly used according to the conventional olefinic thermoplastic elastomer, The outermost layer has a soft surface, which improves the flexibility and the functionality of heat resistance, printability, and the like, so that it can be applied to daily living items such as bed mats, duvets, cushions, and vests.

The configuration of the flexible heating sheet of the present invention for solving the above problems will be described in detail with reference to FIG.

The present invention in the flexible heating sheet 10 made of a laminate,

An upper layer composed of an upper insulating layer laminated in the order of the thermoplastic elastomer layer 11a, which is an outer skin, and the polyethylene terephthalate nonwoven layer 13 below;

The lower insulating layer laminated in the order of the polyethylene terephthalate film layer 12 and the outer layer of the thermoplastic elastomer layer 11b, and the primary conductive adhesive layer 14 and the upper conductive layer arranged on the upper portion of the lower insulating layer A base consisting of a heat generating layer laminated in the order of the electrode 15 and the secondary conductive adhesive layer 16,

And the upper and lower limbs are laminated by the adhesive resin of the adhesive layer 17.

In the present invention, the upper surface of the heat generating sheet 10 includes an upper insulating layer having a structure in which a thermoplastic elastomer layer 11a is laminated on the polyethylene terephthalate nonwoven layer 13 as shown in FIG. 5A.

The nonwoven fabric of the polyethylene terephthalate nonwoven fabric layer 13 of the upper limb improves flexibility with insulation effect and serves to improve physical strength by serving as a support for the heating sheet laminate.

In addition, the thermoplastic elastomer (TPE) of the present invention is preferably made of 15 to 50% by weight of the crystalline thermoplastic resin and 50 to 85% by weight of the modified elastomer. If the mixing amount of the crystalline thermoplastic resin in the thermoplastic elastomer is less than 15% by weight or the mixing amount of the modified elastomer is more than 85% by weight, the flowability may decrease, and the mixing amount of the crystalline thermoplastic resin is 50% by weight. When it exceeds% or when the mixing amount of the modified elastomer becomes less than 50% by weight, there is a possibility that the printability and the adhesive force may be lowered.

The crystalline olefin resin used in the present invention is preferably a crystalline thermoplastic resin such as isotactic polypropylene or syndiotactic polypropylene, and the modified elastomer is an α-olefin resin or EPDM (EPDM, Ethylene Propylene) having elasticity. It is preferable to use an elastomer such as (ter) Diene Monorer) or SBS (Styrene Ethylene Butadiene Styrene).

In the present invention, the bottom of the heating sheet 10 is a lower insulating layer having a structure of laminating a thermoplastic elastomer layer 11b on the lower portion of the polyethylene terephthalate film layer 12 as shown in FIG. 5B and the lower insulating layer. As shown in FIG. 5C, a heat generating layer stacked on the lower insulating layer in the order of the first conductive adhesive layer 14, the electrode 15 arranged on the upper portion thereof, and the second conductive adhesive layer 16. Is done.

The film of the polyethylene terephthalate film layer 12 of the base is subjected to corona discharge treatment, and is subjected to ozone treatment on the surface of the thermoplastic elastomer to oxidize the surface to increase surface roughness (surface roughness) and to increase surface tension. By improving, the adhesive force with another layer is raised.

In the present invention, the corona discharge treatment is a conventional method of corona discharge treatment of the surface of the film. The corona discharge is generated in the polyethylene terephthalate film layer 12 by an electrode and a strong voltage, so that the electrode and the polyethylene terephthalate film layer 12 are separated. When current is generated due to electrons and ions, fine irregularities are formed on the surface of the polyethylene terephthalate film layer by electrons, radicals or protons, and at the same time, some polar groups are introduced by oxygen in the air, thereby increasing the surface roughness and polarizing groups on the surface. It is a technique of improving adhesiveness by introducing.

Ozone treatment in the present invention is a conventional ozone treatment method, by spraying ozone at an angle of 70 ~ 90 ㅀ by spacing of 3 ~ 6cm to the resin of the molten thermoplastic elastomer from the T-Die of the melt extrusion molding machine. This is to improve the adhesive force with the corona-treated polyethylene terephthalate film which is a base by introducing a polar group into the thermoplastic elastomer.

Meanwhile, in the heat generating sheet 10 of the present invention, the heat generating layer is formed by forming a first conductive adhesive layer 14 on the lower insulating layer, and then arranging a pair of electrodes before drying the second conductive adhesive layer 16. ) Is applied to form a structure wrapped around the electrode.

In the present invention, the conductive adhesive layer 14 is applied by gravure printing on top of the corona discharge treated polyethylene terephthalate film 12 using a conventional conductive adhesive composition. The conductive adhesive composition used in the present invention is typically a composition used for a heat generating sheet is given a conductivity of the conductive fabric to play a role in producing a heat effect, and is not a feature of the present invention.

The conductive adhesive composition used in the present invention is a conventional conductive adhesive composition, 20 to 37% epoxy modified urethane resin or epoxy resin, 3 to 8% by weight conductive carbon black, 2 to 3% by weight epoxy silane, 3 to 5 weight by aerosol It is preferable to use what is% and the solvent 55-72 weight%. In the above solvent, methyl ethyl ketone (MEK) and ethylene acetate (EA) are used in a ratio of 1 to 1, respectively.

When the content of the resin in the conductive adhesive composition is less than the range defined above, there is a fear that the adhesive performance is lowered, and when the content of the resin exceeds the range defined above, there are relatively few other compounds. When added, there is a risk that the performance of the conductive adhesive composition is lowered, and when the content of the conductive carbon black is less than the range defined above, the conductive performance may be lowered and the heat generating layer may not be properly generated. If the content exceeds the above-defined range, relatively little other compound may be added to reduce the adhesive performance. If the content of various additives and solvents is less than the above-described range, There is a risk of deterioration in performance, and the content of various additives and solvents If it exceeds the range defined in the group there is added a relatively less other compounds there is a fear that the performance of the conductive adhesive composition deteriorate.

In the electrode used in the present invention, it is preferable to select and use one of the fibers coated with copper, silver, aluminum, or nickel by electroless plating on polyethylene terephthalate fibers or copper foil commonly used.

When the conductive fabric is used as the electrode in the electrode, the existing planar heating element is mainly limited to floor use or other parts that need to be flexible in addition to the part that can be plate-shaped, which can greatly contribute to market expansion. It is thought to be.

The metal used as the electroless solution may be selected from one of silver, copper, gold, and aluminum having excellent conductivity. However, the metal used as the electroless plating solution is not necessarily limited to the above metal, and a metal having better conductivity than carbon may be used as electroless plating. Can be.

The metal is generally used alone, but may be coated with a metal such as nickel to protect the surface of the plating layer in order to control conductivity and improve durability. The control range of the conductivity may be adjusted to 10 ⁻⁴ to 10 ⁻¹ Ω. It is preferable.

In addition, since the elastic body of the thermoplastic elastic layer 11b has already been described above, it will be omitted here.

In the present invention, the adhesive resin for laminating the upper and lower limbs is a resin having a polar group introduced therein, and the polar groups used herein include maleic anhydried and glycidyl methacrylate having an epoxy group. Can be mentioned. The content of the polar group to be introduced is suitable about 0.5wt% ~ 2% by weight, these resins can be used domestically and internationally available products. Examples include DuPont's Fusabond, Polychrome's Polybond, Atopina's Lotarder, and the like. In addition, since these resins generally adopt a back born of polyethylene, polypropylene, or ethylene vinyl acetate, there are no problems in terms of compatibility with the olefin-based and styrene-based thermoplastic elastomers of the present invention. When used as a compatibilizer can also be applied when mixing with a more polar urethane-based thermoplastic elastomer.

And the heat generating sheet 10 of the present invention is preferably adjusted to 30 ~ 300㎛ thickness of each laminate layer in order not to be too thick in consideration of the flexibility in handling and construction.

As described above, the flexible heating sheet 10 of the present invention is characterized in that the upper and lower layers of the upper insulating layer and the lower insulating layer and the heating layer are formed of a laminated structure.

Hereinafter, the method of manufacturing a flexible heating sheet according to the present invention will be described in detail with reference to FIGS. 4, 5A to 5D, and FIG. 6.

In the present invention, a method of manufacturing a flexible heating sheet 10 made of a laminate,

A lower insulating layer forming step (S100) of adhering the polyethylene terephthalate film layer 12 to the upper portion of the thermoplastic elastomer 11b formed by a two-layer coextruder to form an insulating layer;

After the primary conductive adhesive layer 14 is coated on the lower insulating layer by a dry laminating method, an electrode 15 is arranged, and a heat generating layer forming process of forming the secondary conductive adhesive layer 16 by coating (S200). )and;

 An upper layer insulating layer forming step (S300) of forming an insulating layer by adhering the polyethylene terephthalate nonwoven layer 13 to the lower portion of the thermoplastic elastomer 11a layer formed by a two-layer coextruder;

And a lamination process (S400) for laminating the upper insulating layer by using an adhesive layer 17 on the heating layer formed on the lower insulating layer.

Hereinafter, the manufacturing method of the flexible heating sheet 10 according to the present invention will be described in detail for each process as follows.

The lower insulating layer forming process (S100) is a thermoplastic elastomer layer (11b) using a two-layer co-extruder Ti-Die (2 Layer T-Die) under the polyethylene telephthalate film layer 12 as shown in Figure 5a To form a lower insulating layer. In this case, an adhesive resin is used to bond the polyethylene terephthalate film layer 12 and the thermoplastic elastomer layer 11b, and the adhesive resin used in the present invention is conventional synthetic resin, typically ozone low density polyethylene (LDPE). It is preferable to bond by introducing a polar group to the nonpolar polymer by oxidizing with As the adhesive resin, conventional low density polyethylene (LDPE) may be used, but in order to obtain stronger adhesive force, a polyolefin resin having a polar group introduced therein may be used.

Corona pretreatment and ozone treatment for the film and thermoplastic elastomer used in the polyethylene terephthalate film layer 12 in the present invention have already been described above and will be omitted here.

In the heating layer forming process (S200), as shown in FIG. 5B, after forming the first conductive adhesive layer 14 by a dry laminating method on the lower insulating layer, the electrodes 15 are arranged, and then the second conductive adhesive layer is formed. As the process of forming (16), it is preferable that the formation method of a conductive adhesive layer consists of a gravure printing method.

Since the detailed description of the electrode has already been described above, the description thereof will be omitted.

An adhesive layer is formed on the insulating layer by using an adhesive resin as shown in FIG. 5C. Since the adhesive resin has already been described, it will be omitted here.

The upper insulating layer forming process (S300) is a thermoplastic elastomer layer 11b using a polyethylene terephthalate nonwoven layer 13 and a two-layer co-extruder TiDy (2 Layer T-Die) thereon as shown in FIG. 5D. ) Is a step of adhering the upper insulating layer by using an adhesive.

Since the adhesive used in the process has already been described in detail in the lower insulating layer forming process (S100), it will be omitted here.

The lamination process (S400) is a final process of laminating the heating layer and the upper insulating layer formed on the upper portion of the lower insulating layer using an adhesive can produce a flexible heating sheet as shown in FIG.

For reference, Figure 7 shows the state of use of the flexible heating sheet as an embodiment according to the present invention, it shows a state in which the flexible heating sheet 10 is embedded in the interior of the electric mat (20).

Hereinafter, the configuration of the present invention will be described in detail with reference to the following Examples, the configuration of the present invention is not limited only by the following examples.

(Example)

1. Test piece production

As shown in FIG. 4, a flexible heating sheet having a structure having a thickness of 50 to 100 μm was manufactured, and the coating amount of the conductive adhesive laminating liquid and the thickness of the conductive fabric and the copper thin plate as shown in Table 1 below. Samples of Examples 1 to 3 and Comparative Examples 1 to 3 were prepared by adjusting the thickness of each layer, and a heating sheet having a structure having a thickness of 50 to 100 μm was prepared.

In the case of the comparative example, instead of the polyethylene terephthalate film used as the inner skin material in Examples 1 to 3, polyethylene films were used in Comparative Examples 1 to 3, and thermoplastic elastomers were used as the outer skin materials in Examples 1 to 3. In the case of Comparative Examples 1-3, polyvinyl chloride resin was used as a raw material of an outer shell.

In the present invention, the conductive adhesive composition used for the conductive adhesive layer was 30% by weight epoxy-modified urethane resin, 8% by weight conductive carbon black, 2% by weight epoxysilane, 3% by weight aerosol and 57% by weight solvent. The solvent used here is a mixture of methyl ethyl ketone (MEK) and ethylene acetate (EA) in a ratio of 1 to 1, respectively.

                                                       (Unit: μm) division Example Comparative example One 2 3 One 2 3 Endothelial PET film Corona Discharge Treatment Corona Discharge Treatment Corona Discharge Treatment - - - Polyethylene film - - - No corona discharge No corona discharge No corona discharge coat Thermoplastic elastomer Ozone treatment Ozone treatment Ozone treatment - - - PET film - - - Ozone not treated Ozone not treated Ozone not treated electrode 50 ¹⁾ 100 ²⁾ 150 ¹⁾ 50 ²⁾ 100 ²⁾ 150 ²⁾

Note 1) A conductive fabric coated with an electroless solution containing 0.1% of silver on polyethylene terephthalate fibers.

   2) copper foil

2. Electrical safety test

The results of testing the withstand voltage and insulation resistance for 1 minute using the withstand voltage tester at a voltage of 2,000V are shown in [Table 2].

division Example Comparative example One 2 3 One 2 3 ¹⁾ withstand voltage pass pass pass pass pass pass Insulation Resistance ²⁾ pass pass pass pass pass pass Spark generation (220V * 12hr) radish radish radish U U U

Note 1) and 2) Withstand 1500V.

3. Flexibility, deformation and adhesion test

In the flexibility test, the samples of the Examples and Comparative Examples were folded, and the result was determined by visual and tactile judgment while repeating the extraction, and the deformation test was carried out by forming the sample into 50m length of 1m in width and winding it in a 3inch branch pipe to 120 ° C. The product was placed in a heating oven for 3 days and then taken out and left to stand for 1 day for cooling at room temperature. The product was cut into 5 m and unfolded on the floor.

The flexibility test and the deformation test were compared with each other based on the scores evaluated from a total of 5 evaluation groups of 2 males, 3 females, and 3 points of goodness, 2 points of normality, and 1 point of poorness. The score obtained by dividing by 5 was evaluated by converting it into an integer.

And the adhesion test, after laminating the lower limbs and the upper limbs, after 18 hours at 70 ℃ by 180 ° peeling test to confirm the adhesion to each of the results are shown in Table 3 below.

division Example Comparative example One 2 3 One 2 3 Flexibility ¹⁾ ○ ○ ○ △ △ △ Deformation ¹⁾ ○ ○ ○ △ △ △ Adhesive (kgf / 2.54cm) Cannot be peeled off Cannot be peeled off Cannot be peeled off 2.1 1.5 1.7

Note 1) Determination of flexibility and deformation

    -○ is good when observing the bending state and heat state of the heating sheet.

    -When △ is normal by observing the bending state and heat state of the heating sheet

    -× indicates defects by observing the bending and stiffness of the heating sheet.

As a result of performing the withstand voltage and insulation resistance test on the sample through the above experiment, the samples of the Examples and Comparative Examples passed the withstand voltage and insulation resistance in the electrical stability test as shown in Table 2 below, but in the spark generation test In Examples 1 to 3, the adhesive force between the lower and upper limbs is strong, and sparks do not occur. In Comparative Examples 1 to 3, the adhesive force between the upper and lower insulating layers and the copper foil is insufficient, resulting in a fine gap between the electrode and the conductor. It turns out that a spark generate | occur | produces by.

In the flexibility and deformation test, as shown in [Table 3], in Examples 1 to 3, a thermoplastic elastomer was used as the material of the outer shell, and thus, a comparative example using the polyethylene terephthalate film which was not surface treated as the outer shell material. Compared with 1 to 3, it can be seen that all showed good results with flexibility and deformation.

      As described above, in the case of Comparative Examples 1 to 3, a stiff polyethylene terephthalate film is used on both the upper and lower limbs in the same way as the planar heating element sold in the market, so that the product is stiff and thus it is difficult to wind the paper tube in the case of a long product. There was a problem that the smoothness falls even if you unfold again.

In the adhesion test, Examples 1 to 3 used a thermoplastic elastomer as the material of the outer shell and corona discharge treatment of the polyethylene terephthalate film, whereas a polyethylene terephthalate film without surface treatment was used as the outer shell. It turns out that all showed the result with favorable adhesiveness compared with Comparative Examples 1-3.

Accordingly, the heat generating sheet of the present invention uses a thermoplastic elastomer as the material of the outer shell according to the present invention, uses a polyethylene terephthalate film, and performs the ozone treatment and the corona discharge treatment, respectively, in comparison with Comparative Examples 1 to 3 As the electrical spark does not occur, the stability is excellent, and the flexibility as well as the presence or absence of deformation, as well as good adhesion results.

The flexible heating sheet according to the present invention has been fully confirmed as to excellent performance of the flexibility as described in detail through the above embodiment, the present invention is not necessarily limited only to the above embodiment, the technical of the present invention Various substitutions, modifications, and changes can be made without departing from the spirit thereof.

       1 is a view showing a cross section of a conventional heating sheet.

2 is a view showing a cross section of another conventional heating sheet.

3 is a view showing a cross section of another conventional heating sheet.

Figure 4 is a view showing a cross section of the flexible heating sheet of the embodiment according to the present invention.

Figure 5a relates to a cross-sectional view of the base insulating layer of the flexible heating sheet of the embodiment according to the present invention.

5B is a view showing a cross section in which a heating layer is formed on the base insulating layer.

Figure 5c relates to a cross-sectional view of the upper limb insulating layer of the flexible heating sheet of the embodiment according to the present invention.

FIG. 5D is a view showing a cross section in which an adhesive layer is formed using an adhesive on the heating layer of FIG. 5B.

6 is a view showing a state of use of the flexible heating sheet according to the present invention.

7 is a view schematically showing a lamination method according to the present invention.

Explanation of symbols on the main parts of the drawings

10: heating sheet 11: thermoplastic elastomer layer

12: polyethylene terephthalate film layer

13: polyethylene terephthalate nonwoven fabric layer

14 primary conductive adhesive layer 15 electrode

16: secondary conductive adhesive layer 17: adhesive layer

Claims (8)

In the flexible heating sheet consisting of a laminate, As an outer shell, an upper layer composed of an upper insulating layer laminated in the order of a thermoplastic elastomer layer composed of 15 to 50% by weight of a crystalline thermoplastic resin and 50 to 85% by weight of a modified elastomer, and a polyethylene terephthalate nonwoven layer thereunder; The lower insulating layer laminated in the order of the polyethylene terephthalate film layer and the outer layer of the thermoplastic elastomer, and the primary conductive adhesive layer on the upper portion of the lower insulating layer, the electrode arranged on the upper portion and the secondary conductive adhesive layer A base consisting of a heating layer laminated with a And the upper and lower limbs are laminated by the adhesive resin of the adhesive layer, The polyethylene terephthalate film layer is corona pre-treated on the surface, the thermoplastic elastomer is ozone-treated to increase the adhesion, And the electrode is a flexible heating sheet, characterized in that to use one selected from copper, silver, aluminum or nickel coated fiber or copper foil to polyethylene terephthalate fiber. In the method of manufacturing a flexible heating sheet consisting of a laminate, A base insulating layer forming step (S100) of forming an insulating layer by adhering a polyethylene terephthalate film layer on top of a thermoplastic elastomer formed by a two-layer coextruder; An exothermic layer forming step (S200) of forming an electrode by arranging electrodes and then applying a second conductive adhesive layer after applying the first conductive adhesive layer on the base insulating layer by a dry laminating method;  An upper layer insulating layer forming step (S300) of forming an insulating layer by adhering a polyethylene terephthalate nonwoven layer to a lower portion of the thermoplastic elastomer layer formed by a two-layer coextruder; And a laminating step (S400) of laminating the upper limb insulating layer by using an adhesive layer (17) on top of the heating layer formed on the lower insulating layer (S400). The method of claim 2, The thermoplastic elastomer is a manufacturing method of a flexible heating sheet, characterized in that consisting of 60 to 90% by weight of the crystalline thermoplastic resin and 10 to 40% by weight of the modified elastomer. The method of claim 2, The polyethylene terephthalate film layer is corona pre-treated on the surface, the thermoplastic elastomer is ozone-treated method of producing a flexible heating sheet, characterized in that to increase the adhesion. The method of claim 2, The electrode is a method for producing a flexible heating sheet, characterized in that the polyethylene terephthalate fiber is selected from copper, silver, aluminum or nickel coated fiber or copper foil selected from one type. delete delete delete

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