Flexible heating pad and preparation method

Abstract

The present invention relates to the technical field of heating pads, in particular to a flexible heating pad and a preparation method thereof, comprising a heating pad body and a connector, wherein the heating pad body comprises a flexible glass substrate, a heating circuit, a temperature sensing element, a PU film, an aluminum foil layer, a flame-retardant non-woven fabric and an outer layer, wherein the heating circuit is arranged on the flexible glass substrate, and the PU film comprises a first PU layer and a second PU layer, wherein the first PU layer and the second PU layer are respectively attached to the two sides of the flexible glass substrate, and the heating circuit and the temperature sensing element are encapsulated in the flexible glass substrate, and the temperature sensing element is a temperature sensing circuit arranged on the flexible glass substrate. The present invention adopts a flexible glass substrate as a carrier of the heating circuit, and combines the PU film for protection, so as to have a good protection effect, a long service life and good heating uniformity.

Description

Technical Field

[0001] The present invention relates to the technical field of heating pads, and in particular to a flexible heating pad and a preparation method thereof. Background Art

[0002] A heating pad is a mat with heating function, usually used to provide warmth and comfort. They usually use electric heating technology, contain heating elements inside, and can be powered by plug-in or battery. Heating pads are often used for winter warmth, muscle pain relief, joint stiffness and other purposes. Some heating pads also have adjustable temperature and automatic shut-off functions to ensure safety and comfort.

[0003] Most of the heating substrates of existing heating pads are made of paper or flexible circuit substrates, but uneven heating is prone to occur in actual use, and external protection and safety are also poor, resulting in a poor experience in actual use and also affecting the service life. Summary of the invention

[0004] To solve the above problems, the present invention solves the problems of insufficient heating uniformity and insufficient safety of existing heating pads. A flexible glass substrate is used as a carrier of the heating circuit, which has high safety and is protected by a PU film. It has good protection effect, good durability, long service life, and a flexible heating pad and preparation method with good heating uniformity.

[0005] A flexible heating pad comprises a heating pad body and a connector, the heating pad body comprising a flexible glass substrate, a heating circuit, a temperature sensing element, a PU film, an aluminum foil layer, a flame-retardant non-woven fabric and an outer covering layer, the heating circuit is arranged on the flexible glass substrate, the PU film comprises a first PU layer and a second PU layer, the first PU layer and the second PU layer are respectively adhered to the two sides of the flexible glass substrate, and the heating circuit and the temperature sensing element are encapsulated in the flexible glass substrate, and the temperature sensing element is a temperature sensing circuit arranged on the flexible glass substrate; the aluminum foil layer is provided with two layers, and the two aluminum foil layers are respectively arranged on the outer sides of the first PU layer and the second PU layer, the flame-retardant non-woven fabric is provided with at least one layer, and the outer surfaces of the two aluminum foil layers are coated by winding, and the outer covering layer is coated on the outside of the flame-retardant non-woven fabric.

[0006] A further improvement to the above scheme is that a conductive contact point is provided on one side of the flexible glass substrate, and two conductive contact points are provided. The two conductive contact points are respectively connected to the two ends of the heating circuit. The connector includes an upper cover and a lower cover, and the upper cover and the lower cover are buckled together on one side of the heating pad body, and pass through the outer covering layer, the flame-retardant non-woven fabric, the aluminum foil layer, the PU film and the flexible glass substrate in sequence. A first terminal and a second terminal are provided in the connector, and the first terminal is conductively connected to the conductive contact point. The temperature sensing element is provided with a temperature sensing contact point, and the second terminal is conductively connected to the temperature sensing contact point. Metal particles are attached to the outer surface of the flexible glass substrate by spraying, and the metal particles absorb heat and follow the heat when the heating circuit is heated.

[0007] A further improvement to the above scheme is that an edge band is provided on the outside of the outer covering layer, and the edge band is used to seal the periphery of the flexible glass substrate, the heating circuit, the temperature sensing element, the PU film, the aluminum foil layer, the flame-retardant non-woven fabric and the outer covering layer.

[0008] A further improvement to the above solution is that the flexible glass substrate is provided with two layers, and the heating circuit and the temperature sensing element are both provided between the flexible glass substrates on both sides; the thickness of the flexible glass substrate is 0.75-1.25 mm.

[0009] A further improvement to the above solution is that a permeable groove and a temperature sensing groove are provided on one surface of the flexible glass substrate, the heating circuit is formed on the permeable groove by printing, and the temperature sensing element is formed on the temperature sensing groove by printing.

[0010] A further improvement to the above scheme is that the flexible glass substrate is provided with a layer, the thickness of the flexible glass substrate is 0.75 to 1.25 mm, both sides of the flexible glass substrate are provided with penetration grooves and temperature sensing grooves, one side of the flexible glass substrate is provided with penetration grooves and temperature sensing grooves, the heating circuit is formed on the penetration groove by printing, and the temperature sensing element is formed on the temperature sensing groove by printing.

[0011] A further improvement to the above scheme is that the flexible glass substrate is evenly distributed with through holes, the outer layer is provided with connecting buckles, and the outer layer passes through the flame-retardant non-woven fabric, the aluminum foil layer, the PU film and the through holes in sequence through the connecting buckles; the connecting buckles are formed by welding the flexible glass substrate, the flame-retardant non-woven fabric, the aluminum foil layer and the PU film by ultrasonic welding.

[0012] A further improvement to the above scheme is that both the first PU layer and the second PU layer are PU films, and are connected to the two sides of the flexible glass substrate by bonding; the side of the aluminum foil layer facing the flexible glass substrate is a smooth surface or a mirror surface to reflect the heat generated by the heating circuit back to the flexible glass substrate; the aluminum foil layer is evenly distributed with a plurality of perforations, and the perforations are used to discharge heat to the flame-retardant non-woven fabric and the outer layer.

[0013] A further improvement to the above solution is that the flame retardant non-woven fabric is a PP non-woven fabric, and a polyurethane flame retardant layer is sprayed on one side of the flame retardant non-woven fabric.

[0014] A further improvement to the above solution is that the conductive contact point and the heating circuit are integrally arranged, an electrical connection hole is arranged on the conductive contact point, and one end of the first terminal is inserted into the first electrical connection hole.

[0015] A further improvement to the above solution is that the temperature sensing contact point is provided with a temperature sensing circuit connected to the temperature sensing element, and one end of the second terminal is in conductive contact with the temperature sensing contact point.

[0016] A further improvement to the above scheme is that the edge band is sewn to connect the flame retardant non-woven fabric and the outer periphery of the outer covering layer by sewing to form an electric heating chamber inside the flame retardant non-woven fabric, and the electric heating chamber seals the flexible glass substrate, heating circuit, temperature sensing element, PU film and aluminum foil layer; the outer covering layer is a fluff pad.

[0017] A further improvement to the above scheme is that a BOPE film is provided on the inner side of the flame retardant non-woven fabric, and the BOPE film is hot-melted at a high temperature to bond the flexible glass substrate, the PU film, the aluminum foil layer and the flame retardant non-woven fabric.

[0018] A method for preparing a flexible heating pad comprises the following steps:

[0019] Step S1, preparing a flexible glass substrate: unwinding a flexible glass material through an unwinding mechanism, and cutting the flexible glass material to form a flexible glass substrate, rolling a through hole on the flexible glass substrate by rolling, and then conveying the flexible glass substrate to a laser etching mechanism, and etching a rough surface on the flexible glass substrate by laser etching, wherein the rough surface includes a heating trough body, a temperature sensing trough body, and an outer edge groove; then continuing to convey to a printing mechanism, the heating circuit is printed in the heating trough body by the printing mechanism, and in this process, a temperature sensing circuit is printed on the temperature sensing trough body to form a temperature sensing element, and when printing the heating circuit and the temperature sensing circuit, the conductive contact point and the temperature sensing contact point are simultaneously connected;

[0020] Step S2, PU film lamination: after the printing of the heating circuit and the temperature sensing circuit is completed, the PU film is unrolled and laminated on the two surfaces of the flexible glass substrate to cover the heating circuit and the temperature sensing circuit;

[0021] Step S3, aluminum foil lamination: after the PU film is attached, adhesive is sprayed on the outer surface of the PU film, and then the aluminum foil layer is unrolled and pressed onto the surface of the PU film through a mold. During the lamination process, a hot pressing method is used to bond the aluminum foil layer to the PU film.

[0022] Step S4, non-woven fabric coating: after the aluminum foil layer is laminated, a non-woven fabric is wound around the outer periphery of the aluminum foil layer, and the non-woven fabric is wound around the outside of the aluminum foil layer by winding. During the winding process, a BOPE film is placed on the side edge;

[0023] Step S5, flame retardant spraying: after the winding of the non-woven fabric is completed, a polyurethane coating is sprayed on the outside of the non-woven fabric layer by a spraying mechanism to form a flame retardant non-woven fabric layer;

[0024] Step S6, hot-melt edge sealing: The flame-retardant sprayed structure is hot-pressed on the outside of the non-woven fabric by a hot-pressing device. During the hot-pressing process, the BOPE film is hot-melted to form a liquid under high temperature, and then the aluminum foil layer, the PU film layer and the outer groove are hot-melt connected;

[0025] Step S7, outer packaging: the outer layer is prepared into a bag shape by edge banding, and an assembly port is reserved at one end, and then the non-woven bag with hot melt connection is placed into the outer layer, and then the edge is sealed by edge banding, and the assembly structure of the connector is reserved on the outer layer;

[0026] Step S8, connector riveting: insert the first terminal into the conductive contact point, insert the second terminal into the temperature-sensitive contact point, and then align the upper cover and the lower cover with the first terminal and the second terminal and rivet them together through a riveting device to form a connector.

[0027] The beneficial effects of the present invention are:

[0028] Compared with the existing heating pad, the present invention adopts a flexible glass substrate as the substrate of the heating circuit, and prints the heating circuit on the flexible glass substrate, and prints the temperature sensing circuit to form a temperature sensing element at the same time, which plays a key role in heating control and temperature sensing. The PU film is used to protect the flexible glass substrate, and an aluminum foil layer is further provided to reflect heat, so that the heat is fully diffused, and the heating uniformity and effect are improved. The flame-retardant non-woven fabric plays a flame-retardant protective role on the interior, and improves the structural stability and safety. The outer layer adopts a bag-like structure, the internal structure is installed, and the connector is installed and the conductive transmission and connection are carried out through the conductive contact point and the terminal. So that the heating circuit and the temperature sensing element are conductive and the data is transmitted and controlled. The problem of insufficient heating uniformity and insufficient safety of the existing heating pad is solved. The flexible glass substrate is used as the carrier of the heating circuit, which has high safety and is combined with the PU film for protection, with good protection effect, good durability, long service life and good heating uniformity.

[0029] The present invention uses a flexible glass substrate as a carrier, and the heating circuit and the temperature sensing element are encapsulated inside the PU film, and the PU film is covered by an aluminum foil layer and a flame-retardant non-woven fabric, and the outer layer covers the outside. This design can achieve uniform heating and heating while ensuring heating efficiency.

[0030] The double-layer design of the flame-retardant non-woven fabric and the aluminum foil layer provides good flame-retardant properties, making the heating pad safer and more reliable during operation and reducing the risk of fire.

[0031] A conductive contact point is provided on one side of the flexible glass substrate, and the connector passes through each layer of material through the upper cover and the lower cover and is connected to the heating pad body. A first terminal and a second terminal are provided in the connector, which are conductively connected to the conductive contact point and the temperature sensing contact point respectively. This design ensures the reliable power supply and temperature monitoring function of the heating pad.

[0032] By spraying metal particles on the outer surface of the flexible glass substrate, when the heating circuit heats up, the metal particles can absorb the heat and heat up with it, further improving the heating effect. It also ensures the heating uniformity and heat preservation effect.

[0033] An edge band is arranged on the outside of the outer covering layer to seal the periphery of each layer of material. This design effectively prevents the external environment from corroding and damaging the internal structure of the heating pad.

[0034] The present invention realizes efficient and uniform heating, safety protection, reliable power supply and temperature monitoring functions, and innovates in material selection and processing technology, so that the heating pad has high technical content and market competitiveness. This heating pad is suitable for various occasions requiring flexible heating, such as car seat heating, medical care, outdoor clothing and other fields, and has broad application prospects.

[0035] A method for preparing a flexible heating pad adopts automated equipment such as an unwinding mechanism, a laser etching mechanism, and a printing mechanism to realize the rapid preparation and processing of a flexible glass substrate, greatly improving production efficiency and reducing production costs. A rough surface is etched on the flexible glass substrate by laser etching technology, including a heating trough body, a temperature sensing trough body, and an outer groove. At the same time, when printing the heating circuit and the temperature sensing circuit, the conductive contact point and the temperature sensing contact point can be accurately set at the appropriate position, ensuring the stable performance and reliability of the heating pad. Through the lamination of the PU film, the pressing of the aluminum foil layer, and the coating of the non-woven fabric, the distribution of each layer of the heating pad is clear and tightly combined, ensuring the heating effect and safety. A polyurethane coating is sprayed on the non-woven fabric to form a flame-retardant non-woven fabric layer, and the flame retardant performance of the heating pad is further improved by hot-melt edge sealing treatment, reducing the risk of fire. Through the connector riveting process, the first terminal and the second terminal can be firmly connected to the conductive contact point and the temperature sensing contact point, ensuring the reliable power supply and temperature monitoring function of the heating pad. The edge band is used to prepare the bag, and an assembly port is reserved at one end. Then the non-woven bag with hot melt connection is placed in the outer layer to form an outer package, which improves the durability and aesthetics of the heating pad. The flexible heating pad preparation method achieves efficient production, precise processing, improved flame retardant performance and reliable connector preparation by optimizing the processing technology and material selection, providing more stable and reliable technical support for the manufacture of flexible heating pads. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a three-dimensional schematic diagram of the automation equipment of the present invention;

[0037] Figure 2 for Figure 1 A three-dimensional schematic diagram of another perspective of the automation equipment;

[0038] Figure 3 for Figure 1 A three-dimensional schematic diagram of another perspective of the automation equipment;

[0039] Figure 4 for Figure 1 Side view of the automation equipment;

[0040] Figure 5 for Figure 4 A is an enlarged schematic diagram;

[0041] Figure 6 This is a schematic structural diagram of an embodiment of a flexible glass substrate of the present invention;

[0042] Figure 7 FIG. 4 is a schematic structural diagram of another embodiment of a flexible glass substrate of the present invention.

[0043] Explanation of the accompanying drawings: heating pad body 10, connector 20, flexible glass substrate 1, conductive contact point 11, power connection hole 111, through hole 12, heating circuit 2, temperature sensing element 3, temperature sensing contact point 31, PU film 4, first PU layer 41, second PU layer 42, aluminum foil layer 5, flame retardant non-woven fabric 6, BOPE film 61, outer layer 7, edge banding 71, connecting buckle 72, upper cover 8, first terminal 81, second terminal 82, lower cover 9. DETAILED DESCRIPTION

[0044] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0045] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0047] like Figure 1 to Figure 7 As shown, in one embodiment of the present invention, a flexible heating pad is involved, including a heating pad body 10 and a connector 20, the heating pad body 10 includes a flexible glass substrate 1, a heating circuit 2, a temperature sensing element 3, a PU film 4, an aluminum foil layer 5, a flame retardant non-woven fabric 6 and an outer layer 7, the heating circuit 2 is arranged on the flexible glass substrate 1, the PU film 4 includes a first PU layer 41 and a second PU layer 42, the first PU layer 41 and the second PU layer 42 are respectively attached to the two sides of the flexible glass substrate 1, and the heating circuit 2 and the temperature sensing element 3 are encapsulated in the flexible glass substrate 1, and the temperature sensing element 3 is a temperature sensing circuit arranged on the flexible glass substrate 1; the aluminum foil layer 5 is provided with two layers, and the two aluminum foil layers 5 are respectively arranged on the outer sides of the first PU layer 41 and the second PU layer 42, the flame retardant non-woven fabric 6 is provided with at least one layer, and the outer surfaces of the two aluminum foil layers 5 are coated by winding, and the outer layer 7 is coated on the outside of the flame retardant non-woven fabric 6.

[0048] This embodiment uses a flexible glass substrate 1 as the substrate of the heating circuit 2, and the heating circuit 2 is printed on the flexible glass substrate 1, and the temperature sensing circuit is printed at the same time to form a temperature sensing element 3, which plays a key role in heating control and temperature sensing. The PU film 4 is used to protect the flexible glass substrate 1, and the aluminum foil layer 5 is further provided to reflect heat, so that the heat is fully diffused, and the heating uniformity and effect are improved. The flame-retardant non-woven fabric 6 plays a flame-retardant protective role on the interior, and improves the structural stability and safety. The outer layer 7 adopts a bag-like structure, the internal structure is installed, and the connector 20 is installed and the conductive transmission and connection are carried out through the conductive contact point and the terminal. So that the heating circuit 2 and the temperature sensing element 3 are conductive and the data is transmitted and controlled. The problem of insufficient heating uniformity and insufficient safety of the existing heating pad is solved. The flexible glass substrate 1 is used as the carrier of the heating circuit 2, which has high safety and is combined with the PU film 4 for protection, with good protection effect, good durability, long service life and good heating uniformity.

[0049] In the above embodiment, a flexible glass substrate 1 is used as a carrier, a heating circuit 2 and a temperature sensing element 3 are encapsulated inside a PU film 4, and the PU film 4 is covered by an aluminum foil layer 5 and a flame-retardant non-woven fabric 6, and an outer layer 7 is covered on the outside. This design can achieve uniform heating and heating while ensuring heating efficiency.

[0050] In the above embodiment, the provision of the flame-retardant non-woven fabric 6 and the double-layer design of the aluminum foil layer 5 provide good flame-retardant properties, making the heating pad safer and more reliable during operation and reducing the risk of fire.

[0051] A conductive contact point 11 is provided on one side of the flexible glass substrate 1, and two conductive contact points 11 are provided. The two conductive contact points 11 are connected to the two ends of the heating circuit 2 respectively. The connector 20 includes an upper cover 8 and a lower cover 9. The upper cover 8 and the lower cover 9 are mutually buckled on one side of the heating pad body 10, and pass through the outer covering layer 7, the flame-retardant non-woven fabric 6, the aluminum foil layer 5, the PU film 4 and the flexible glass substrate 1 in sequence. A first terminal 81 and a second terminal 82 are provided in the connector 20. The first terminal 81 is conductively connected to the conductive contact point 11. The temperature sensing element 3 is provided with a temperature sensing contact point 31, the second terminal 82 is conductively connected to the temperature sensing contact point 31; the outer surface of the flexible glass substrate 1 is attached with metal particles by spraying, and the metal particles absorb heat and follow the heating circuit 2 when it is heated; in the above embodiment, a conductive contact point 11 is provided on one side of the flexible glass substrate 1, and the connector 20 passes through each layer of material through the upper cover 8 and the lower cover 9 and is connected to the heating pad body 10. The first terminal 81 and the second terminal 82 are provided in the connector 20, which are conductively connected to the conductive contact point 11 and the temperature sensing contact point 31 respectively. This design ensures the reliable power supply and temperature monitoring function of the heating pad. In this embodiment, the temperature sensing element can be a patch temperature sensing chip, which can also be set on the flexible glass substrate 1 for use.

[0052] In the above embodiment, the outer surface of the flexible glass substrate 1 is sprayed with metal particles, and when the heating circuit 2 generates heat, the metal particles can absorb the heat and generate heat accordingly, thereby further improving the heating effect and ensuring the heating uniformity and heat preservation effect.

[0053] The outer side of the outer covering layer 7 is provided with an edge band 71, and the edge band 71 is used to seal the outer periphery of the flexible glass substrate 1, the heating circuit 2, the temperature sensing element 3, the PU film 4, the aluminum foil layer 5, the flame-retardant non-woven fabric 6 and the outer covering layer 7. In the above embodiment, the edge band 71 is provided on the outer side of the outer covering layer 7 to seal the outer periphery of each layer of material. This design effectively prevents the external environment from eroding and damaging the internal structure of the heating pad.

[0054] This embodiment realizes efficient heating and uniform heating, safety protection, reliable power supply and temperature monitoring functions, and innovates in material selection and processing technology, so that the heating pad has high technical content and market competitiveness. This heating pad is suitable for various occasions requiring flexible heating, such as car seat heating, medical care, outdoor clothing and other fields, and has broad application prospects.

[0055] See also Figure 6As shown, in one embodiment, the flexible glass substrate 1 is provided with two layers, and the heating circuit 2 and the temperature sensing element 3 are both provided between the flexible glass substrates 1 on both sides; the thickness of the flexible glass substrate 1 is 0.75-1.25 mm; a permeation groove and a temperature sensing groove are provided on one side of the flexible glass substrate 1, and the heating circuit 2 is formed on the permeation groove by printing, and the temperature sensing element 3 is formed on the temperature sensing groove by printing; in this embodiment, since the heating circuit 2 and the temperature sensing element 3 are both provided between the flexible glass substrates 1 on both sides, the heating pad can achieve uniform heating from both sides inward, thereby improving the heating effect and the accuracy of temperature control. The thickness of the flexible glass substrate 1 is 0.75-1.25 mm, which is thinner than the substrate of the traditional heating pad, and can better adapt to various curved surfaces, thereby improving the flexibility and applicability of the heating pad. A permeation groove and a temperature sensing groove are provided on one side of the flexible glass substrate 1, and the heating circuit 2 is formed on the permeation groove by printing, and the temperature sensing element 3 is formed on the temperature sensing groove by printing. This design enables the heating circuit 2 and the temperature sensing element 3 to fit closely on the substrate surface, ensuring the heating effect and the stability of temperature monitoring. The heating circuit 2 and the temperature sensing element 3 are arranged between the flexible glass substrate 1, making the overall structure more compact, reducing the thickness and weight of the heating pad, and improving the heating efficiency and response speed.

[0056] See also Figure 7 As shown, in one embodiment, a flexible glass substrate 1 is provided with a layer, the thickness of the flexible glass substrate 1 is 0.75-1.25 mm, and both sides of the flexible glass substrate 1 are provided with a permeation groove and a temperature sensing groove, and one side of the flexible glass substrate 1 is provided with a permeation groove and a temperature sensing groove, and the heating circuit 2 is formed on the permeation groove by printing, and the temperature sensing element 3 is formed on the temperature sensing groove by printing. In this embodiment, the thickness of the flexible glass substrate 1 is 0.75-1.25 mm, which is thinner than the substrate of the traditional heating pad. This design makes the heating pad more flexible and can better adapt to various curved surfaces, thereby improving the flexibility and applicability of the heating pad. By providing permeation grooves and temperature sensing grooves on both sides of the flexible glass substrate 1, and printing the heating circuit 2 on the permeation groove and the temperature sensing element 3 on the temperature sensing groove, the uniformity of heating and temperature control is achieved. This design enables the heating pad to achieve uniform heating from both sides inward, thereby improving the heating effect and the accuracy of temperature control. Since the heating circuit 2 and the temperature sensing element 3 are both arranged on a layer of flexible glass substrate 1, and penetration grooves and temperature sensing grooves are arranged on both sides, the overall structure is more compact, the thickness and weight of the heating pad are reduced, and the heating efficiency and response speed are improved.

[0057] The flexible glass substrate 1 is evenly distributed with through holes 12, and the outer cladding 7 is provided with a connecting buckle 72, and the outer cladding 7 passes through the flame-retardant non-woven fabric 6, the aluminum foil layer 5, the PU film 4 and the through hole 12 in sequence through the connecting buckle 72; the connecting buckle 72 is formed by ultrasonic welding the flexible glass substrate 1, the flame-retardant non-woven fabric 6, the aluminum foil layer 5 and the PU film 4. In this embodiment, the multi-layer structure is connected together by ultrasonic welding to ensure the stability and integrity of the structural connection, and further ensure the diffusion of heating uniformity and heating efficiency in actual use.

[0058] The first PU layer 41 and the second PU layer 42 are both PU films 4, and are connected to the two sides of the flexible glass substrate 1 by adhesion; the side of the aluminum foil layer 5 facing the flexible glass substrate 1 is a smooth surface or a mirror surface, so as to reflect the heat emitted by the heating circuit 2 back to the flexible glass substrate 1; the aluminum foil layer 5 is evenly distributed with a plurality of perforations, and the perforations are used to discharge heat to the flame-retardant non-woven fabric 6 and the outer layer 7. In this embodiment, the side of the aluminum foil layer 5 facing the flexible glass substrate 1 is a smooth surface or a mirror surface, which can effectively reflect the heat emitted by the heating circuit 2 back to the flexible glass substrate 1, thereby improving the heating efficiency and reducing energy loss. The aluminum foil layer 5 is evenly distributed with a plurality of perforations, which are used to discharge heat to the flame-retardant non-woven fabric 6 and the outer layer 7, avoiding heat retention inside the heating pad, improving the heat dissipation effect of the heating pad, and reducing the accumulation of internal temperature, thereby ensuring the safety performance of the heating pad. The first PU layer 41 and the second PU layer 42 are both PU films 4, and are connected to the two sides of the flexible glass substrate 1 by bonding. This design ensures the close connection between the PU film 4 and the flexible glass substrate 1, and improves the durability and stability of the heating pad.

[0059] The flame retardant non-woven fabric 6 is a PP non-woven fabric, and one side of the flame retardant non-woven fabric 6 is sprayed with a polyurethane flame retardant layer. The design of spraying the polyurethane flame retardant layer improves the flame retardant properties of the flame retardant non-woven fabric 6, making the heating pad safer and more reliable during operation and reducing the risk of fire. The PP non-woven fabric itself has good wear resistance and tensile strength. Combined with the spraying of the polyurethane flame retardant layer, the durability and stability of the flame retardant non-woven fabric 6 can be enhanced, and the service life of the heating pad can be extended. The flame retardant non-woven fabric 6 serves as the outer covering layer 7 of the heating pad, which not only has a flame retardant function, but also can play a certain role in thermal insulation, reduce heat loss to the outside, and improve heating efficiency.

[0060] The conductive contact point 11 is integrally provided with the heating circuit 2, and an electric connection hole 111 is provided on the conductive contact point 11, and one end of the first terminal 81 is inserted into the first electric connection hole 111; the temperature sensing contact point 31 is provided with a temperature sensing circuit connected to the temperature sensing element 3, and one end of the second terminal 82 is in conductive contact with the temperature sensing contact point 31. In this embodiment, the conductive contact point 11 is integrally provided with the heating circuit 2, which simplifies the structure of the heating pad, reduces the number of parts, and improves manufacturing efficiency and reliability. The first terminal 81 is inserted into the electric connection hole 111 of the conductive contact point 11, ensuring the stability and reliability of the electrical connection, and effectively preventing poor contact or short circuit. The temperature sensing contact point 31 is provided with a temperature sensing circuit connected to the temperature sensing element 3, and the second terminal 82 is connected to the temperature sensing contact point 31 through conductive contact, thereby realizing the detection and control of the surface temperature of the heating pad, and improving the safety and stability of the heating pad.

[0061] The edge band 71 sews the flame retardant non-woven fabric 6 and the outer layer 7 together to form an electric heating chamber in the flame retardant non-woven fabric 6, and the electric heating chamber seals the flexible glass substrate 1, the heating circuit 2, the temperature sensing element 3, the PU film 4 and the aluminum foil layer 5; the outer layer 7 is a fluff pad. In this embodiment, by sewing the edge band 71, the flame retardant non-woven fabric 6 and the outer layer 7 are connected together to form an electric heating chamber, which can effectively seal the flexible glass substrate 1, the heating circuit 2, the temperature sensing element 3, the PU film 4 and the aluminum foil layer 5 together, providing good protection and isolation effects, and reducing the impact of the external environment on the heating element. The outer layer 7 uses a fluff pad, which may provide a more comfortable touch and warming effect, increase the comfort of the heating pad and the comfort of human contact. The overall sewing connection design enhances the structural stability and durability of the heating pad, and can better resist the pulling and wear in daily use.

[0062] A BOPE film 61 is provided on the inner side of the flame retardant non-woven fabric 6, and the BOPE film 61 is bonded to the flexible glass substrate 1, the PU film 4, the aluminum foil layer 5 and the flame retardant non-woven fabric 6 after being hot-melted at high temperature. In this embodiment, the BOPE film 61 can bond the flexible glass substrate 1, the PU film 4, the aluminum foil layer 5 and the flame retardant non-woven fabric 6 together after being hot-melted at high temperature. This bonding method provides good bonding strength and sealing, ensures that the heating element is isolated from the external environment, and can resist pulling and wear. As an inner material, the BOPE film 61 may provide additional protection and isolation, which can prevent external moisture, dust and other substances from eroding the heating element, and extend the service life of the heating pad.

[0063] In the above embodiments, BOPE can be PET, PA or PP.

[0064] Polyester film (PET) has good mechanical properties and thermal stability and can be used as an alternative material to achieve similar hot melt bonding effects.

[0065] Polyamide film (PA) has excellent heat and chemical resistance and can also be used as an alternative material to achieve hot melt bonding and protect heating elements and other internal structures.

[0066] Polypropylene film (PP) has good heat-sealing properties and mechanical strength, and can also be used as a substitute for BOPE film 61 for hot-melt bonding.

[0067] A method for preparing a flexible heating pad comprises the following steps:

[0068] Step S1, preparing a flexible glass plate: unwinding the flexible glass material through an unwinding mechanism, and cutting the flexible glass material to form a flexible glass plate, rolling a through hole 12 on the flexible glass plate by rolling, and then conveying the flexible glass plate to a laser etching mechanism, etching a rough surface on the flexible glass plate by laser etching, the rough surface includes a heating tank body, a temperature sensing tank body and an outer groove; then continuing to convey to a printing mechanism, the heating circuit 2 is printed in the heating tank body by the printing mechanism, and in this process, a temperature sensing circuit is printed on the temperature sensing tank body to form a temperature sensing element 3, and when printing the heating circuit 2 and the temperature sensing circuit, the conductive contact point 11 and the temperature sensing contact point 31 are simultaneously formed;

[0069] Step S2, PU film 4 lamination: after the printing of the heating circuit 2 and the temperature sensing circuit is completed, the PU film 4 is unrolled and laminated on the two surfaces of the flexible glass plate to cover the heating circuit 2 and the temperature sensing circuit;

[0070] Step S3, laminating the aluminum foil layer 5: after the PU film 4 is attached, the outer surface of the PU film 4 is sprayed with adhesive, and then the aluminum foil layer 5 is unrolled, and the aluminum foil layer 5 is pressed onto the surface of the PU film 4 through a mold. During the laminating process, a hot pressing method is used to bond the aluminum foil layer 5 to the PU film 4;

[0071] Step S4, non-woven fabric coating: After the aluminum foil layer 5 is attached, a non-woven fabric is wound around the outer periphery of the aluminum foil layer 5, and the non-woven fabric is wound around the outside of the aluminum foil layer 5 by winding. During the winding process, a BOPE film 61 is placed on the side edge;

[0072] Step S5, flame retardant spraying: after the winding of the non-woven fabric is completed, a polyurethane coating is sprayed on the outside of the non-woven fabric layer by a spraying mechanism to form 6 layers of flame retardant non-woven fabric;

[0073] Step S6, hot-melt edge sealing: The flame-retardant sprayed structure is hot-pressed on the outside of the non-woven fabric by a hot-pressing device. During the hot-pressing process, the BOPE film 61 is hot-melted to form a liquid under high temperature, and then the aluminum foil layer 5, the PU film 4 and the outer groove are hot-melt connected;

[0074] Step S7, outer packaging: the outer layer 7 is prepared into a bag shape by the edge band 71, and an assembly port is reserved at one end, and then the non-woven bag with hot melt connection is placed into the outer layer 7, and then the edge is sealed by the edge band 71, and the assembly structure of the connector 20 is reserved on the outer layer 7;

[0075] Step S8, riveting the connector 20: inserting the first terminal 81 into the conductive contact point 11, inserting the second terminal 82 into the temperature sensing contact point 31, and then aligning the upper cover 8 and the lower cover 9 with the first terminal 81 and the second terminal 82 and riveting them together through a riveting device to form the connector 20.

[0076] The preparation method adopts automated equipment such as unwinding mechanism, laser etching mechanism, printing mechanism, etc. to realize the rapid preparation and processing of flexible glass plate, greatly improve production efficiency and reduce production cost. A rough surface is etched on the flexible glass plate by laser etching technology, including a heating tank body, a temperature sensing tank body and an outer groove. At the same time, when printing the heating circuit 2 and the temperature sensing circuit, the conductive contact point 11 and the temperature sensing contact point 31 can be accurately set in the appropriate position, ensuring the stable performance and reliability of the heating pad. Through the bonding of the PU film 4, the pressing of the aluminum foil layer 5 and the coating of the non-woven fabric, the distribution of each layer of the heating pad is clear and tightly combined, ensuring the heating effect and safety. The polyurethane coating is sprayed on the non-woven fabric to form 6 layers of flame-retardant non-woven fabric, and the flame retardant performance of the heating pad is further improved by hot-melt edge sealing treatment, reducing the risk of fire. Through the riveting process of the connector 20, the first terminal 81 and the second terminal 82 can be firmly connected to the conductive contact point 11 and the temperature sensing contact point 31, ensuring the reliable power supply and temperature monitoring function of the heating pad. The edge band 71 is used to prepare the bag shape, and an assembly port is reserved at one end, and then the non-woven bag with hot melt connection is placed in the outer layer 7 to form an outer package, thereby improving the durability and aesthetics of the heating pad. The method for preparing a flexible heating pad achieves efficient production, precise processing, improved flame retardant performance, and reliable connector 20 preparation by optimizing processing technology and material selection, thereby providing more stable and reliable technical support for the manufacture of flexible heating pads.

[0077] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the attached claims.

Claims

1. A flexible heating pad, comprising a heating pad body and a connector, characterized in that: The heating pad body includes a flexible glass substrate, a heating circuit, a temperature sensing element, a PU film, an aluminum foil layer, a flame-retardant non-woven fabric and an outer covering layer, wherein the heating circuit is arranged on the flexible glass substrate, the PU film includes a first PU layer and a second PU layer, the first PU layer and the second PU layer are respectively attached to the two sides of the flexible glass substrate, and the heating circuit and the temperature sensing element are encapsulated in the flexible glass substrate, and the temperature sensing element is a temperature sensing circuit arranged on the flexible glass substrate; the aluminum foil layer is provided with two layers, and the two aluminum foil layers are respectively arranged on the outer sides of the first PU layer and the second PU layer, the flame-retardant non-woven fabric is provided with at least one layer, and the outer surfaces of the two aluminum foil layers are coated by winding, and the outer covering layer is coated on the outside of the flame-retardant non-woven fabric; A conductive contact point is provided on one side of the flexible glass substrate, and two conductive contact points are provided. The two conductive contact points are connected to the two ends of the heating circuit respectively. The connector includes an upper cover and a lower cover, and the upper cover and the lower cover are buckled with each other on one side of the heating pad body, and pass through the outer covering layer, the flame-retardant non-woven fabric, the aluminum foil layer, the PU film and the flexible glass substrate in sequence. A first terminal and a second terminal are provided in the connector, and the first terminal is conductively connected to the conductive contact point. The temperature sensing element is provided with a temperature sensing contact point, and the second terminal is conductively connected to the temperature sensing contact point. Metal particles are attached to the outer surface of the flexible glass substrate by spraying, and the metal particles absorb heat and follow the heat generation when the heating circuit is heated; An edge band is arranged on the outside of the outer covering layer, and the edge band is used to seal the outer periphery of the flexible glass substrate, the heating circuit, the temperature sensing element, the PU film, the aluminum foil layer, the flame-retardant non-woven fabric and the outer covering layer; The flexible glass substrate is evenly provided with through holes, the outer cladding is provided with connecting buckles, and the outer cladding passes through the flame-retardant non-woven fabric, the aluminum foil layer, the PU film and the through holes in sequence through the connecting buckles; the connecting buckles weld the flexible glass substrate, the flame-retardant non-woven fabric, the aluminum foil layer and the PU film by ultrasonic welding; The first PU layer and the second PU layer are both PU films, and are connected to the two sides of the flexible glass substrate by gluing; the side of the aluminum foil layer facing the flexible glass substrate is a smooth surface or a mirror surface, so as to reflect the heat generated by the heating circuit back to the flexible glass substrate; the aluminum foil layer is evenly distributed with a plurality of perforations, and the perforations are used to discharge heat to the flame-retardant non-woven fabric and the outer layer; The flame retardant non-woven fabric is a PP non-woven fabric, and one side of the flame retardant non-woven fabric is sprayed with a polyurethane flame retardant layer; The edge band is sewn to connect the flame retardant non-woven fabric and the outer periphery of the outer covering layer by sewing to form an electric heating chamber in the flame retardant non-woven fabric, and the electric heating chamber seals the flexible glass substrate, the heating circuit, the temperature sensing element, the PU film and the aluminum foil layer; the outer covering layer is a fluff pad; A BOPE film is arranged on the inner side of the flame-retardant non-woven fabric, and the BOPE film is bonded to the flexible glass substrate, the PU film, the aluminum foil layer and the flame-retardant non-woven fabric after being hot-melted at a high temperature.

2. The flexible heating pad according to claim 1, characterized in that: The flexible glass substrate is provided with two layers, and the heating circuit and the temperature sensing element are both provided between the flexible glass substrates on both sides; the thickness of the flexible glass substrate is 0.75-1.25 mm; A permeable groove and a temperature sensing groove are arranged on one surface of the flexible glass substrate, the heating circuit is formed on the permeable groove by printing, and the temperature sensing element is formed on the temperature sensing groove by printing.

3. The flexible heating pad according to claim 1, characterized in that: The flexible glass substrate is provided with a layer, the thickness of the flexible glass substrate is 0.75-1.25 mm, both sides of the flexible glass substrate are provided with penetration grooves and temperature sensing grooves, the heating circuit is formed on the penetration grooves by printing, and the temperature sensing element is formed on the temperature sensing grooves by printing.

4. The flexible heating pad according to claim 1, characterized in that: The conductive contact point is integrally provided with the heating circuit, and an electric connection hole is provided on the conductive contact point, and one end of the first terminal is inserted into the first electric connection hole; The temperature sensing contact point is provided with a temperature sensing circuit connected to the temperature sensing element, and one end of the second terminal is in conductive contact with the temperature sensing contact point.

5. A method for preparing a flexible heating pad according to any one of claims 1 to 4, characterized in that: The steps include: Step S1, preparing a flexible glass substrate: unwinding a flexible glass material through an unwinding mechanism, and cutting the flexible glass material to form a flexible glass substrate, rolling a through hole on the flexible glass substrate by rolling, and then conveying the flexible glass substrate to a laser etching mechanism by conveying, and etching a rough surface on the flexible glass substrate by laser etching, wherein the rough surface includes a heating trough body, a temperature sensing trough body, and an outer edge groove; then continuing to convey to a printing mechanism, the heating circuit is printed in the heating trough body by the printing mechanism, and in this process, a temperature sensing circuit is simultaneously printed on the temperature sensing trough body to form a temperature sensing element, and when printing the heating circuit and the temperature sensing circuit, the conductive contact point and the temperature sensing contact point are simultaneously formed; Step S2, PU film lamination: after the printing of the heating circuit and the temperature sensing circuit is completed, the PU film is unrolled and laminated on the two surfaces of the flexible glass substrate to cover the heating circuit and the temperature sensing circuit; Step S3, aluminum foil lamination: after the PU film is attached, adhesive is sprayed on the outer surface of the PU film, and then the aluminum foil layer is unrolled and pressed onto the surface of the PU film through a mold. During the lamination process, a hot pressing method is used to bond the aluminum foil layer to the PU film. Step S4, non-woven fabric coating: After the aluminum foil layer is laminated, the non-woven fabric is wound around the outer periphery of the aluminum foil layer. The non-woven fabric is wound around the outside of the aluminum foil layer by winding. During the winding process, a BOPE film is placed on the side edge. Step S5, flame retardant spraying: after the winding of the non-woven fabric is completed, a polyurethane coating is sprayed on the outside of the non-woven fabric layer by a spraying mechanism to form a flame retardant non-woven fabric layer; Step S6, hot-melt edge sealing: The flame-retardant sprayed structure is hot-pressed on the outside of the non-woven fabric by a hot-pressing device. During the hot-pressing process, the BOPE film is hot-melted to form a liquid under high temperature, and then the aluminum foil layer, the PU film layer and the outer groove are hot-melt connected; Step S7, outer packaging: the outer layer is prepared into a bag shape by edge banding, and an assembly port is reserved at one end, and then the non-woven bag with hot melt connection is placed into the outer layer, and then the edge is sealed by edge banding, and the assembly structure of the connector is reserved on the outer layer; Step S8, connector riveting: insert the first terminal into the conductive contact point, insert the second terminal into the temperature-sensitive contact point, and then align the upper cover and the lower cover with the first terminal and the second terminal and rivet them together through a riveting device to form a connector.

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