Temperature-variable stable heating film and production device thereof

Abstract

This utility model discloses a temperature-stable heating film and its production device. The heating film includes: a conductive heating film; a copper foil disposed on top of the conductive heating film; a conductive adhesive layer disposed on the bottom surface of the copper foil, wherein the conductive adhesive layer has metal particles embedded in the copper foil and the conductive heating film; and a protective film disposed on the top surface of the conductive heating film and the copper foil, wherein an adhesive layer is disposed on the bottom surface of the protective film. In the heating film, the metal particles embedded in the copper foil and the conductive heating film ensure a strong connection between the copper foil and the conductive heating film, preventing separation. Therefore, even when the polymer conductive adhesive softens and creeps after heating, the copper foil is not easily separated from the conductive heating film, ensuring the stability of the heating film product and its stable and reliable quality.

Description

Technical Field

[0001] This utility model relates to the technical field of heating films and their production equipment. Background Technology

[0002] Some mattresses, sofas, and car seats are equipped with electrically heated heating films. These films generate heat by inputting electrical energy, thus improving user comfort. In existing technology, the heating film typically consists of a conductive heating film, copper foil, silver paste, and a protective film. The silver paste is applied to the surface of the copper foil. During manufacturing, adhesive is applied to the conductive heating film, then the conductive copper foil is installed, and finally the protective film is bonded. When powered on, the current is conducted through the copper foil and then transferred to the conductive heating film via the silver paste between the copper foil and the conductive heating film.

[0003] In actual use, the heating film is heated up, and the silver paste softens and molecules become free. In addition, some behaviors (such as shaking of car seats or movement when the user is sitting or lying down) will cause friction on the surface of the heating film, causing the heating film to creep and stretch. Under these effects, the copper foil is prone to separate from the conductive heating film, forming a large resistance between the two, which leads to quality problems.

[0004] Therefore, improvements are needed to address the issue of copper foil easily separating from the conductive heating film. Utility Model Content

[0005] The purpose of this invention is to provide a temperature-stable heating film that can solve the problem of copper foil easily separating from the conductive heating film.

[0006] This utility model also provides a production apparatus for the above-mentioned temperature-stable heating film.

[0007] According to a first aspect of the present invention, a temperature-stable heating film is provided, comprising: a conductive heating film; a copper foil disposed above the conductive heating film; a conductive adhesive layer disposed on the bottom surface of the copper foil, wherein the conductive adhesive layer has metal particles embedded in the copper foil and the conductive heating film; and a protective film disposed on the top surface of the conductive heating film and the copper foil, wherein an adhesive layer is disposed on the bottom surface of the protective film.

[0008] According to the temperature-stable heating film, the metal particles have multiple spikes.

[0009] According to the temperature-stable heating film, the metal particles are in the shape of a triangular prism or a triangular pyramid.

[0010] According to the temperature-stable heating film, the top surface of the copper foil is covered with an adhesive film.

[0011] According to the temperature-stable heating film, the film is made of PET material.

[0012] According to the temperature-stable heating film, the copper foil is configured as multiple strips arranged in parallel.

[0013] According to the temperature-stable heating film, the conductive heating film is a carbon nanotube heating film.

[0014] According to a second aspect of the present invention, a production apparatus for a temperature-stable heating film is provided, comprising: a frame; a first roller rotatably disposed on the frame for holding a roll of conductive heating film; a second roller rotatably disposed on the frame for holding a roll of copper foil; a third roller rotatably disposed on the frame for holding a roll of protective film; a hot-pressing roller assembly disposed on the frame; a fourth roller rotatably disposed on the frame; and a guide roller assembly rotatably disposed on the frame and located between the second roller and the hot-pressing roller assembly; wherein the first roller and the third roller are arranged vertically parallel, and the second roller is located between the first roller and the third roller.

[0015] According to the production apparatus for the temperature-stable heating film, the hot press roller assembly includes: a heating roller with an installation cylinder at its end, the installation cylinder being fitted with a bearing, the bearing being mounted on a frame; an installation plate being disposed on the frame; and an installation seat being disposed on the side wall of the installation plate and located inside the installation cylinder, the installation seat being provided with an electric heating element, the electric heating element being located inside the heating roller; wherein, two heating rollers are provided and arranged in parallel.

[0016] According to the production device for the temperature-stable heating film, the guide roller group includes a first pressure roller and a second pressure roller arranged in parallel. The second pressure roller is fitted with a plurality of limiting sleeves. The limiting sleeves are provided with grooves, and the bottom surface of the grooves is provided with threaded holes.

[0017] Beneficial effects: In the heating film, metal particles are embedded in copper foil and conductive heating film to ensure a strong connection between the copper foil and conductive heating film and prevent separation. Therefore, when the polymer conductive adhesive softens and creeps after heating, the copper foil is not easy to separate from the conductive heating film, ensuring the stability of the heating film product and its stable and reliable quality.

[0018] In the production equipment, conductive heating film, copper foil, and protective film can be installed on the equipment. The copper foil and protective film are pressed by a hot press roller group and bonded to the conductive heating film in one step, and then rolled up. The heating film product is pressed into shape in one step, resulting in better adhesion, more stable structure, simplified production process, high efficiency, and large output.

[0019] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0021] Figure 1 This is a cross-sectional view of an embodiment of a temperature-stable heating film;

[0022] Figure 2 This is a schematic diagram of the arrangement of copper foil on the conductive heating film in an embodiment of a temperature-stable heating film.

[0023] Figure 3 This is a simplified structural diagram of the production apparatus embodiment;

[0024] Figure 4 This is a structural diagram of the second pressure roller in the production device embodiment;

[0025] Figure 5 This is a cross-sectional view of the hot press roller assembly in an embodiment of the production apparatus. Detailed Implementation

[0026] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0027] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] In the description of this utility model, terms such as greater than, less than, and exceeding are understood to exclude the stated number, while terms such as above, below, and within are understood to include the stated number. The use of terms like "first" and "second" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the quantity or sequence of the indicated technical features.

[0029] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0030] Reference Figure 1-2This utility model provides a temperature-stable heating film, which includes a conductive heating film 11, a copper foil 12, a conductive adhesive layer 13, and a protective film 14. The copper foil 12 is disposed above the conductive heating film 11, the conductive adhesive layer 13 is disposed on the bottom surface of the copper foil 12, and the conductive adhesive layer 13 has metal particles embedded in the copper foil 12 and the conductive heating film 11. The protective film 14 is disposed on the top surface of the conductive heating film 11 and the copper foil 12, and the bottom surface of the protective film 14 is provided with an adhesive layer.

[0031] During preparation, metal particles are added to the conductive adhesive raw material and mixed evenly. The conductive adhesive containing the metal particles is then coated onto the surface of the copper foil 12 to form a conductive adhesive layer 13. During the production and assembly of the heating film, pressure is applied to the copper foil 12 and the conductive heating film 11 to embed the metal particles into them, ensuring a strong connection between the copper foil 12 and the conductive heating film 11 and preventing separation. Therefore, even when the polymer conductive adhesive softens and creeps after heating, the copper foil 12 is not easily separated from the conductive heating film 11, ensuring the stability of the heating film product. This results in stable and reliable quality, enabling reliable application in products such as chairs, sofas, and mattresses.

[0032] In this embodiment, the metal particles have multiple spikes to ensure reliable embedding into the copper foil 12 and the conductive heating film 11. The metal particles can have a triangular prism or triangular pyramidal structure, etc.

[0033] In this embodiment, the top surface of the copper foil 12 is covered with an adhesive film 15, which may be made of PET material. The adhesive film 15 can increase the tensile strength of the copper foil 12, making it less prone to breakage; and the adhesive film 15 has insulating properties, so when the protective film 14 is scratched or worn, the adhesive film 15 can also play a certain insulating role, improving safety.

[0034] In this embodiment, the copper foil 12 is configured as multiple strips arranged in parallel. This structure allows for adjusting the spacing between the copper foils 12 according to the input voltage requirements to achieve a low-voltage input of 5-48V.

[0035] In this embodiment, the conductive heating film 11 can be configured as a carbon nanotube heating film. The protective film 14 can be determined according to the user's needs (such as insulation, heat insulation, shielding, etc.) and its thickness parameters.

[0036] Reference Figure 3-5The production apparatus for temperature-stable heating film according to this utility model includes a frame 21, a first roller 22, a second roller 23, a third roller 24, a hot pressing roller group 25, a fourth roller 26, and a guide roller group 27. The first roller 22, the second roller 23, the third roller 24, the fourth roller 26, and the guide roller group 27 are all rotatably mounted on the frame 21. The hot pressing roller group 25 is mounted on the frame 21. The guide roller group 27 is located between the second roller 23 and the hot pressing roller group 25. The first roller 22 and the third roller 24 are arranged in parallel vertically. The second roller 23 is located between the first roller 22 and the third roller 24.

[0037] Specifically, the frame 21 has two vertically parallel wall panels, and the first roller 22, the second roller 23, the third roller 24, the hot press roller group 25, the fourth roller 26, and the guide roller group 27 are all disposed between the two wall panels. The first roller 22 is used to place the rolled conductive heating film 11, the second roller 23 is used to place the rolled copper foil 12 (one side of the copper foil 12 is covered with adhesive film 15, and the other side is covered with conductive adhesive), the third roller 24 is used to place the rolled protective film 14 (the protective film 14 is coated with adhesive), and the fourth roller 26 is used to place the assembled heating film product.

[0038] During production, the rolled conductive heating film 11, copper foil 12 and protective film 14 are respectively placed on the first roller 22, the second roller 23 and the third roller 24. The conductive heating film 11 and the protective film 14 are pulled to the hot press roller group 25. The copper foil 12 is pulled to the hot press roller group 25 after passing through the guide roller group 27. The metal particles can be embedded into the copper foil 12 and the conductive heating film 11 by the heating and pressure of the hot press roller group 25. The conductive heating film 11, copper foil 12 and protective film 14 are bonded together to form a heating film. The heating film is moved to be wound on the first roller 22.

[0039] In the above scheme, the conductive heating film 11, copper foil 12 and protective film 14 can be installed on the production device. The copper foil 12 and protective film 14 are pressed together with the conductive heating film 11 by the hot press roller group 25 and then rolled up. The heating film product is pressed together in one step, resulting in better adhesion, more stable structure, simplified production process, high efficiency and large output.

[0040] In this embodiment, the hot press roller assembly 25 includes a heating roller 251, a mounting plate 252, and a mounting base 253. The heating roller 251 has a mounting cylinder 2511 at its end. The mounting cylinder 2511 is fitted with a bearing 2512, which is mounted on the frame 21. The mounting plate 252 is bolted to the frame 21. The mounting base 253 is located on the side wall of the mounting plate 252 and is located inside the mounting cylinder 2511. The mounting base 253 is equipped with an electric heating element 254, which is located inside the heating roller 251.

[0041] Two heating rollers 251 are arranged in parallel. The conductive heating film 11, copper foil 12, and protective film 14 are drawn between the two heating rollers 251. The heating element 254 heats the inside of the heating rollers 251 and conducts the heat to the surface of the heating rollers 251 to hot press the conductive heating film 11, copper foil 12, and protective film 14.

[0042] In some embodiments, an electric heating film or electric heating wire may be provided on the inner surface of the heating roller 251, and a conductive slip ring may be provided on the frame 21. The conductive slip ring is arranged coaxially with the mounting cylinder 2511 so as to supply power to the electric heating film and electric heating wire.

[0043] In this embodiment, the guide roller assembly 27 includes a first pressure roller 271 and a second pressure roller 272 arranged in parallel. The second pressure roller 272 is fitted with a plurality of limiting sleeves 2721. The limiting sleeves 2721 have grooves 2722, and the bottom surface of the grooves 2722 has threaded holes 2723. By inserting bolts into the threaded holes 2723 and pressing them against the second pressure roller 272, the limiting sleeves 2721 are fixed, and a channel 2724 for the copper foil 12 to pass through can be formed between adjacent limiting sleeves 2721. The copper foil 12 first passes under the first pressure roller 271, then passes over the second pressure roller 272 (while the copper foil 12 is still located in the channel 2724), and finally reaches between the two heating rollers 251. The first pressure roller 271 presses the copper foil 12 to limit its movement; the limiting sleeve 2721 on the second pressure roller 272 can limit the copper foil 12 to slide along the axial direction of the second pressure roller 272, thereby providing good guidance for the movement of the copper foil 12.

[0044] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A temperature-stable heating film, characterized in that, include: Conductive heating film (11); A copper foil (12) is disposed above the conductive heating film (11); A conductive adhesive layer (13) is disposed on the bottom surface of the copper foil (12), and the conductive adhesive layer (13) has metal particles embedded in the copper foil (12) and the conductive heating film (11); A protective film (14) is disposed on the top surface of the conductive heating film (11) and the copper foil (12), and an adhesive layer is disposed on the bottom surface of the protective film (14).

2. The temperature-stable heating film according to claim 1, characterized in that, The metal particles have multiple spikes.

3. The temperature-stable heating film according to claim 1 or 2, characterized in that, The metal particles are in the shape of a triangular prism or a triangular pyramid.

4. The temperature-stable heating film according to claim 1, characterized in that, The top surface of the copper foil (12) is covered with an adhesive film (15).

5. The temperature-stable heating film according to claim 4, characterized in that, The adhesive film (15) is made of PET material.

6. The temperature-stable heating film according to claim 1, characterized in that, The copper foil (12) is configured as multiple strips arranged in parallel.

7. The temperature-stable heating film according to claim 1, characterized in that, The conductive heating film (11) is a carbon nanotube heating film.

8. A production apparatus for a temperature-stable heating film, characterized in that, include: Rack (21); The first roller (22) is rotatably mounted on the frame (21) for holding the rolled conductive heating film (11); The second roller (23) is rotatably mounted on the frame (21) for holding the rolled copper foil (12); The third roller (24) is rotatably mounted on the frame (21) for holding the rolled protective film (14); A hot press roller assembly (25) is mounted on the frame (21); The fourth roller (26) is rotatably mounted on the frame (21); The guide roller assembly (27) is rotatably mounted on the frame (21) and located between the second roller shaft (23) and the hot press roller assembly (25); The first roller (22) and the third roller (24) are arranged in parallel vertically, and the second roller (23) is located between the first roller (22) and the third roller (24).

9. The production apparatus for the temperature-stable heating film according to claim 8, characterized in that, The hot press roller assembly (25) includes: The heating roller (251) has a mounting cylinder (2511) at its end, and the mounting cylinder (2511) is fitted with a bearing (2512), which is mounted on the frame (21). Mounting plate (252) is disposed on the frame (21); The mounting base (253) is disposed on the side wall of the mounting plate (252) and located inside the mounting cylinder (2511). The mounting base (253) is provided with an electric heating element (254), which is located inside the heating roller (251). The heating rollers (251) are configured as two and arranged in parallel.

10. The production apparatus for the temperature-stable heating film according to claim 8, characterized in that, The guide roller group (27) includes a first pressure roller (271) and a second pressure roller (272) arranged in parallel. The second pressure roller (272) is fitted with a plurality of limiting sleeves (2721). The limiting sleeves (2721) are provided with grooves (2722), and the bottom surface of the grooves (2722) is provided with threaded holes (2723).

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