A low-temperature baked electronic cigarette heating element and preparation method thereof

Abstract

The present invention discloses a low-temperature baked electronic cigarette heating element and a preparation method thereof, comprising: a prismatic ceramic substrate, a resistor circuit pattern and a lead-out electrode printed on the surface of the prismatic ceramic substrate, a lead-out wire connected to the lead-out electrode, and a glass protective layer covering the surface of the resistor circuit pattern; wherein the resistor circuit pattern is evenly distributed on each side of the prismatic ceramic substrate. The prismatic heating element provided by the present invention has a resistor circuit pattern evenly printed on its side, which can achieve a uniform heating effect; and the glass protective layer on its surface is not easy to fall off, which can prevent the problem of excessively high local temperature when heating the cigarette cartridge, thereby improving the user experience and service life of the electronic cigarette.

Description

Technical Field

[0001] The invention relates to a low-temperature baked electronic cigarette heating element and a preparation method thereof. Background Art

[0002] With the rapid development of low-temperature baking electronic cigarettes, its heating element, as a core component, determines the overall design and performance quality level of low-temperature baking electronic cigarettes.

[0003] At present, most of the heating elements are formed by directly winding the resistance wire on the sheet or cylindrical shape. When in use, the heating element is directly inserted into the middle of the cigarette cartridge, and the resistance wire is in direct contact with the cigarette cartridge. This method will cause the problem of uneven heating, and the local temperature will be too high, causing the tobacco to produce additional harmful substances.

[0004] Currently, there is a method of printing resistive heating patterns on a sheet ceramic substrate, but the heating distribution is uneven, which can easily cause some tobacco to overheat and produce toxic odors, and cause the surface protective layer to fall off, so that the resistance wire is in direct contact with the tobacco, and the heater cannot be smoothly inserted into the tobacco (tobacco cartridge), reducing the stability and service life of the heater.

[0005] The disclosure of the above background technology content is only used to assist in understanding the inventive concept and technical solution of the present invention. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above content has been disclosed before the filing date of this patent application, the above background technology should not be used to evaluate the novelty and creativity of this application. Summary of the invention

[0006] The main purpose of the present invention is to provide a prismatic low-temperature baked electronic cigarette heating element and a preparation method thereof. By printing a resistor circuit pattern on each surface of the prismatic ceramic substrate and making an insulating protective layer on the surface, the cigarette cartridge can be heated evenly and the local temperature can be prevented from being too high and causing the cigarette cartridge to produce harmful odors.

[0007] A low-temperature baked electronic cigarette heating element comprises: a prismatic ceramic substrate, a resistance circuit pattern and a lead-out electrode printed on the surface of the prismatic ceramic substrate, a lead-out wire connected to the lead-out electrode, and a glass protective layer covering the surface of the resistance circuit pattern; wherein the resistance circuit pattern is evenly distributed on each side of the prismatic ceramic substrate.

[0008] The prismatic heating element provided by the present invention has a resistor circuit pattern evenly printed on its side, which can achieve a uniform heating effect, and the glass protective layer on its surface is not easy to fall off, which can prevent the problem of local overtemperature when heating the cigarette cartridge, thereby improving the user experience and service life of the electronic cigarette.

[0009] A method for preparing a low-temperature baked electronic cigarette heating element comprises the following steps:

[0010] S1. providing a prismatic ceramic substrate;

[0011] S2, printing a resistor circuit pattern sequentially and continuously on each side surface of the prismatic ceramic substrate, and printing lead electrodes at the starting end and the end of the resistor circuit pattern respectively, and sintering;

[0012] S3, printing a glass protective layer slurry on the surface of the resistor circuit pattern and sintering it to form a glass protective layer;

[0013] S4, welding a lead wire at the lead electrode;

[0014] S5. Measure whether the resistance value of the resistance circuit pattern meets the preset requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of a low-temperature baking electronic cigarette heating element provided by a specific embodiment of the present invention;

[0016] Figure 2 Schematic diagram of three sides of a triangular prism heating element with a pointed end in one embodiment of the present invention;

[0017] Figure 3 It is a schematic diagram of the lead-out electrode welding lead-out wire. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods.

[0019] One specific embodiment of the present invention provides a low-temperature baking electronic cigarette heating element, referring to Figures 1 to 3 , Figure 1 The three-dimensional structure of the heating element is shown, and the heating element includes: a prismatic ceramic substrate 10, a resistance circuit pattern 11 and a lead electrode 12 printed on the surface of the prismatic ceramic substrate 10, a lead wire 13 connected to the lead electrode 12, and a glass protective layer covering the surface of the resistance circuit pattern 11; wherein the resistance circuit pattern 11 is evenly distributed on each side of the prismatic ceramic substrate 10.

[0020] The ceramic matrix of the heating element may be in the shape of a triangular prism or a quadrangular prism. In order to facilitate insertion into a cigarette cartridge for heating, one end of the triangular prism or quadrangular prism-shaped ceramic matrix is ​​a pointed tip, and the tip is preferably a triangular pyramid or a quadrangular pyramid that matches the triangular prism or the quadrangular prism. Of course, other forms of tips are also possible, as long as their function is to facilitate insertion into the cigarette cartridge, and the present invention does not limit the specific shape of the tip. In addition, the ceramic matrix of the heating element may also be a pentagonal prism, a hexagonal prism, etc., but is not limited thereto. Preferably, it is a triangular prism or a quadrangular prism, which is convenient for making and printing surface resistance circuit patterns and lead electrodes. Figure 2 As shown, (a), (b) and (c) respectively illustrate the three side surfaces of a triangular prism-shaped heating element with a triangular pyramid tip, and the resistance circuit patterns on the three side surfaces are of a series structure. Figure 3 (a') and (c') respectively show two lead-out electrodes of the printed resistor circuit welded to the lead-out wires 13 .

[0021] In order to ensure uniform heating, in addition to uniform distribution of the resistance circuit patterns, the resistance values ​​of the resistance circuit patterns on each side of the ceramic substrate can also be the same. The resistance value is designed according to the specific product requirements; the connection relationship between the resistance circuit patterns on each side can also be series, parallel, or series-parallel mixed, which is also determined according to the specific product requirements. For example, if the resistance is large and the resistivity is small, they can be connected in series, otherwise they can be connected in parallel.

[0022] Another specific embodiment of the present invention provides a method for preparing the aforementioned low-temperature baked electronic cigarette heating element, comprising the following steps:

[0023] S1. Provide a prismatic ceramic substrate. The present invention preferably uses a triangular or quadrangular prism-shaped ceramic substrate, and can further use a triangular prism or quadrangular prism ceramic substrate with a pointed end. The material of the ceramic substrate can be one or a mixture of two or more of the traditional ceramic materials such as aluminum oxide, zirconium oxide, aluminum nitride, silicon carbide, silicon nitride, etc.

[0024] S2. Print the resistor circuit pattern on each side of the prismatic ceramic substrate in sequence and continuously, and print the lead-out electrodes at the starting end and the end of the resistor circuit pattern respectively, and sinter. The printing method can be screen printing, and the conductive paste used for printing the resistor circuit pattern and the lead-out electrode can be one of Au, Pt, Ag-Pd, Pd, Pt-Au, Pt-Mo, Ni-Cr, Ag, W, Ni, Cu, and stainless steel, or a mixed paste of two or more. The thickness of the printed circuit is 1 to 50 μm, and the width of the circuit is 30 to 1000 μm. After printing is completed, high-temperature sintering is carried out. The sintering atmosphere can be air, reducing atmosphere or protective atmosphere, and the sintering temperature is 650 to 1600°C.

[0025] S3. Print glass protective layer slurry on the surface of the resistor circuit pattern and sinter to form a glass protective layer. The material of the glass protective layer can be one or a mixture of two or more of silicon dioxide, aluminum oxide, boron oxide, calcium oxide, zinc oxide, magnesium oxide, etc. The protective layer slurry is covered on the surface of the resistor circuit pattern and the lead-out electrode (the part to be welded to the lead-out wire is reserved) by screen printing, steel screen printing or coating, and then sintered at 400-1100°C in air, reducing atmosphere or protective atmosphere. The thickness of the protective layer is 5-30μm.

[0026] S4, soldering the lead wires at the lead electrodes. The solder can be made of tin, silver, copper, nickel, zinc, etc. and their alloys, but is not limited thereto. The resistance between the two lead wires is 0.1 to 5.0Ω.

[0027] S5, measuring whether the resistance value of the resistance circuit pattern meets the preset requirements. Resistance is a very important indicator of the heating element, so the resistance value should be tested in the last step of the preparation method to see whether it meets the preset requirements.

[0028] The technical solution of the present invention is further described below through a specific embodiment.

[0029] First, the alumina ceramic is made into a triangular prism with a top conical structure by injection molding, the length of the triangular prism ceramic base is 18 mm, the width is 2 mm, and the length of the top conical structure is 3 mm. The ceramic used for the triangular prism ceramic base is 95 ceramic or 96 ceramic.

[0030] Then, the ceramic substrate is placed in a corresponding printing jig, which has small holes for vacuum adsorption, and can firmly adsorb the triangular prism ceramic substrate in the jig groove, and position it with the printing screen through the positioning holes to prevent printing deviation.

[0031] Next, a resistor circuit pattern is printed on one of the sides of the triangular prism ceramic substrate. After printing one side, the ceramic substrate is rotated, and then the adjacent side is printed, so that a series resistor circuit pattern loop is printed on its three sides. The resistor paste is silver paste, the line thickness is about 15μm, and the line width is designed in three sections: the first and last sections are located at the bottom of the ceramic substrate, with a width of about 250μm and a length of about 1.5mm. As the lead-out electrode, the thickness of the lead-out electrode is thicker than other lines; the 1mm long section near the top of the ceramic substrate has a width of 130μm; in addition, the line about 12.5mm long in the middle of the ceramic substrate has a width of about 200μm. Formation Figure 1 The heating element shown, such as Figure 2As shown, the circuit patterns on the three sides of the heating element are connected by the grooves on the edges of the prism to form a complete series circuit. The lead wire 13 welded to the lead electrode has a diameter of about 0.35 mm, and the main body is a nickel wire, and a layer of silver is plated on the surface of the nickel wire as an anti-oxidation layer.

[0032] The heater adopts a three-sided printed resistance heating circuit, and the three sides heat together, which makes the heating more uniform. The resistance circuit is designed so that the width of the circuit becomes narrower from the bottom to the top. The resistance at the top is greater and the heat is stronger, so that the heat is better transferred to the tip of the substrate, and the resistance at the tail is smaller, so that the temperature will not be too high, which will have an adverse effect on the wire and other structures of the electronic cigarette. The design of circuits with different widths makes the resistance circuit heat more uniformly and the tobacco is baked more completely. The outer glass layer is not easy to fall off, which protects the circuit and improves the heating stability and the life of the heater.

[0033] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art of the present invention, several equivalent substitutions or obvious variations can be made without departing from the concept of the present invention, and the performance or use is the same, which should be regarded as belonging to the protection scope of the present invention.

Claims

1. A low-temperature baking electronic cigarette heating element, characterized in that: include: A prismatic ceramic substrate (10), a resistor circuit pattern (11) and a lead electrode (12) printed on the surface of the prismatic ceramic substrate (10), a lead wire connected to the lead electrode (12), and a glass protective layer covering the surface of the resistor circuit pattern (11); the prismatic ceramic substrate (10) is a triangular prism or a quadrangular prism, and one end of the prismatic ceramic substrate (10) is a triangular pyramid or a quadrangular pyramid tip adapted to the triangular prism or the quadrangular prism; The resistance circuit pattern (11) is evenly distributed on each side of the prismatic ceramic substrate (10); the line width of the resistance circuit pattern gradually narrows from the bottom to the top of the ceramic substrate; and the resistance value of the resistance circuit pattern on each side of the prismatic ceramic substrate (10) is the same.

2. A method for preparing a low-temperature baked electronic cigarette heating element, characterized in that: The following steps are involved: S1. Provide a prismatic ceramic substrate, wherein the prismatic ceramic substrate is a triangular prism or a quadrangular prism, and one end of the prismatic ceramic substrate is a triangular pyramid or a quadrangular pyramid tip adapted to the triangular prism or the quadrangular prism; S2, printing the resistor circuit pattern successively and continuously on each side of the prismatic ceramic substrate, and printing the lead-out electrodes at the starting end and the end of the resistor circuit pattern respectively, and sintering; the resistor circuit pattern is evenly distributed on each side of the prismatic ceramic substrate; the line width of the resistor circuit pattern gradually narrows from the bottom to the top of the ceramic substrate; S3, printing a glass protective layer slurry on the surface of the resistor circuit pattern and sintering it to form a glass protective layer; S4, welding a lead wire at the lead electrode; S5. Measure whether the resistance value of the resistance circuit pattern meets the preset requirements.

3. The preparation method according to claim 2, characterized in that: In step S2, the prismatic ceramic substrate is placed in a printing jig, and a resistor circuit pattern is printed on each side of the prismatic ceramic substrate.

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