Processing method of heating sheet

Abstract

The invention provides a processing method of a heating sheet, which comprises the following steps of: providing a base material sheet, and pretreating the base material sheet to obtain an intermediate of which the average thickness per unit distance is gradually reduced from the middle part to two sides; wherein the unit distance is greater than or equal to 100 microns; and removing redundant materials in the intermediate to obtain the heating sheet with the target shape. The method comprises the following steps: preprocessing a base material sheet to obtain an intermediate of which the average thickness per unit distance is gradually reduced from the middle part to two sides; according to the required shape of the heating sheet, the material at the corresponding position in the intermediate is removed, so that the heating part of the finally obtained heating sheet also has the characteristic that the average thickness of the unit distance is gradually reduced from the middle part to the two sides, and the heating power of the heating part is gradually increased from the middle part to the edge; the temperature change difference of different areas of the heating part can be reduced, actual heat loss is effectively counteracted, the actual temperature distribution of the surface of the heating part is more uniform, and the effective atomization area proportion is increased.

Description

Technical Field

[0001] The invention belongs to the technical field of heating sheet processing, and in particular relates to a processing method of a heating sheet. Background Art

[0002] The heating plate is an important part of the atomizer. If the temperature of the heating plate is too low, the atomization effect may deteriorate. If the temperature is too high, part of the smoke oil may become burnt, thus affecting the user experience. In the related technology, the thickness of each area of ​​the heating plate is usually fixed. When the current flows through the heating plate, the heat in the middle area of ​​the heating plate can only be dissipated by heat conduction and phase change on the upper and lower surfaces. In addition to the heat from the upper and lower surfaces, the heat in the edge area can also be dissipated from the electrode pins with lower temperatures around. This makes the temperature of the edge area of ​​the heating plate low and the temperature of the middle area high, that is, the temperature distribution of the heating plate is uneven; this will cause the temperature of the middle area to reach the critical value faster during the power increase process, and the smoke will have a burnt smell, and even burn the heating plate, and the atomization effect is not ideal. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a processing method of a heating plate, aiming to solve the problem of uneven temperature distribution of the heating plate in the related art.

[0004] To solve the above technical problems, the present invention is implemented as follows: a processing method for a heating sheet is provided, comprising the following steps: Providing a substrate sheet, and pre-treating the substrate sheet to obtain an intermediate body whose average thickness per unit distance gradually decreases from the middle to both sides; wherein the unit distance is greater than or equal to 100 um; Excess material in the intermediate is removed to obtain a heating sheet of a target shape; wherein the heating sheet includes a heating portion and electrodes respectively connected to opposite sides of the heating portion, the middle portion of the intermediate corresponds to the middle portion of the heating portion, and the direction of the middle portion of the heating portion toward the electrode is the same as the direction in which the average thickness of the intermediate decreases.

[0005] Furthermore, the substrate sheet is a metal sheet, and the pretreatment process includes: The metal sheet is etched to obtain an intermediate body with an undulating concave-convex structure on the surface; wherein the depth of the grooves on the intermediate body gradually increases from the middle to both sides.

[0006] Furthermore, when the etching method is electrolytic etching, the step of etching the metal sheet includes: Covering the area on the surface of the metal sheet that does not need to be etched with a resist to obtain a covering body forming the area to be etched; Etching the area to be etched, and controlling the etching amount per unit distance of the etching area to gradually increase from the middle of the area to be etched to both sides; The remaining resist on the metal sheet is removed to obtain an intermediate.

[0007] Further, the step of etching the area to be etched and controlling the etching amount per unit distance of the etching area to gradually increase from the middle of the area to be etched to both sides includes: Fixing the covering body on the anode of the mobile electrolytic etching device, and making the area to be etched face the cathode of the mobile electrolytic etching device; The etching is powered on so that the depth of the groove formed on the surface to be etched gradually increases from the middle to both sides, thereby obtaining a groove corresponding to the target etching pattern shape.

[0008] Furthermore, the step of etching by power-on also includes: when the power amount is the same, adjusting the moving speed of the cathode to adjust the etching depth of different areas, so as to obtain a groove corresponding to the target etching pattern shape.

[0009] Furthermore, the electrode for etching the metal sheet includes an anode and a cathode, the side of the anode close to the cathode is a plane, and the distance between the cathode and the anode gradually decreases from the middle to both sides; the step of etching the area to be etched and controlling the etching amount per unit distance of the etching area to gradually increase from the middle to both sides of the area to be etched includes: Fixing the exposed and developed metal sheet between the anode and the cathode, and making the area to be etched face the middle of the cathode side close to the anode; The electrodes are energized to perform etching to obtain grooves corresponding to the target etching pattern shape.

[0010] Furthermore, the electrode for etching the metal sheet includes an anode and at least three cathodes arranged in parallel above the anode; the step of etching the area to be etched and controlling the etching amount per unit distance of the etching area to gradually increase from the middle of the area to be etched to both sides includes: Fixing the exposed and developed metal sheet between the anode and the cathode; Each cathode is controlled to etch at the corresponding position of the area to be etched according to the preset duty cycle of the electrode to obtain a groove corresponding to the target etching pattern shape; the duty cycle is the ratio between the power-on time of the target cathode and the sum of the power-on time of all cathodes.

[0011] Furthermore, the duty ratios corresponding to the cathodes arranged in sequence are changed in a gradient manner; the trend of the gradient change is to decrease first and then increase.

[0012] Furthermore, the step of exposing and developing the metal sheet coated with the resist comprises: The surface to be etched of the metal sheet coated with the resist is subjected to patterned exposure so that the unexposed area on the surface to be etched is displayed as a target etching pattern; wherein the target etching pattern is at least one of a circle, an ellipse, a polygon, a strip, a curve, and a broken line, and the target etching pattern is arranged at intervals or distributed in a mesh shape; The resist in the unexposed area is washed away using a preset chemical reagent to obtain a covering body.

[0013] Furthermore, the process of etching the metal sheet includes: single-sided etching of the metal sheet, or double-sided etching of the metal sheet.

[0014] Compared with the prior art, the processing method of the heating sheet in the present invention has the following beneficial effects: by pre-treating the substrate sheet, an intermediate body is obtained, the average thickness per unit distance of which gradually decreases from the middle to the two sides, and the material at the corresponding position in the intermediate body is removed according to the required shape of the heating sheet, so that the heating part of the heating sheet finally obtained also has the characteristic that the average thickness per unit distance gradually decreases from the middle to the two sides, so that the heating power of the heating part is gradually increased from the middle to the edge, which can reduce the temperature change difference in different areas of the heating part, effectively offset the actual heat loss, make the actual temperature distribution on the surface of the heating part more uniform, and increase the proportion of effective atomization area. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a process flow chart of the heating sheet in the embodiment of the present invention; Figure 2 is a schematic cross-sectional view parallel to the current direction of a heating sheet in an embodiment of the present invention; Figure 3 is a schematic diagram of etching electrodes in the first etching processing method in an embodiment of the present invention and a diagram showing changes in electrode movement speed over time during the etching process; Figure 4 is a schematic diagram of an etching electrode in a second etching processing method in an embodiment of the present invention; Figure 5 is a schematic diagram of an etching electrode in a third etching processing method in an embodiment of the present invention; Figure 6 It is a schematic structural diagram of a metal heating sheet in an embodiment of the present invention.

[0016] Among them, Figure 6 The symbols in the figure indicate: 01, heating part; 02, electrode. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0018] In this embodiment, if Figure 1 As shown, the processing method of the heating sheet includes the following steps: S100, providing a substrate sheet, and pre-treating the substrate sheet to obtain an intermediate body whose average thickness per unit distance gradually decreases from the middle to both sides.

[0019] Specifically, the unit distance is greater than or equal to 100um. The heating sheet includes a heating portion and electrodes connected to opposite sides of the heating portion, respectively. The middle of the intermediate body corresponds to the middle of the heating portion, and the direction of the middle of the heating portion toward the electrode is the same as the direction in which the average thickness of the intermediate body decreases. In this embodiment, an intermediate body is prepared whose average thickness per unit distance gradually decreases from the middle to both sides.

[0020] S200, removing excess material in the intermediate to obtain a heating sheet of a target shape. Specifically, the required heating sheet can be obtained by removing the material at the corresponding position in the intermediate body according to the required shape of the heating sheet, and the heating portion of the heating sheet also has the characteristic that the average thickness per unit distance gradually decreases from the middle to the two sides, so that when the current flows through, the heating power of the heating portion gradually increases from the middle to the two sides. Since the heat dissipation capacity of each area in the heating portion has a trend of gradually increasing from the middle to the edge, it can be achieved that the area with strong heat dissipation capacity of the heating portion has a larger heating power, and the area with weak heat dissipation capacity has a smaller heating power, thereby reducing the temperature distribution difference in different areas of the heating portion, and can effectively offset the actual heat loss, so that the actual temperature distribution on the surface of the heating portion is more uniform, and the effective atomization area ratio of the heating sheet is increased. Among them, step S200 includes: using a stamping template to stamp the intermediate body to obtain the required heating sheet sample.

[0021] like Figure 2 The figure shows a cross-sectional schematic diagram of a heating sheet formed by step S100 and step S200 in the present embodiment, wherein the heating sheet includes a plurality of heating areas of unit distance, and the surface of each heating area of ​​unit distance includes a plurality of grooves formed by etching, and the groove depth of the heating area of ​​the middle unit distance gradually increases toward the groove depth of the unit distance on both sides, and the heating areas of unit distance at both ends are symmetrical about the heating area of ​​the middle unit distance. Specifically, the resistance from the positive electrode connection end of the electrode to the heating area of ​​the negative electrode connection end is set to R1, R2, R3, R2, R1 in sequence, and each heating area forms a series circuit. The actual current path passing through R1, R2, and R3 is the unetched part of each heating area, which is the basic heating area of ​​the heating area of ​​unit distance, and the heat generated by the etched part is small (the circled part in the figure, that is, the unetched metal on the side of the etching area is short-circuited, so it only conducts heat but does not generate heat).

[0022] In a specific embodiment, at room temperature (20 degrees Celsius), the resistivity of the heating sheet is 0.74Ω / mm2*m (20℃). When the heating power of each area of ​​the heating part is characterized by the series equivalent resistance, the heating of the metal heating sheet conforms to the Joule heating effect of the conductor. According to the resistivity formula and the Joule heat formula It can be seen that the heat generated per unit length of the heating part is equal to: Among them, q is the heat generated by the heating part per unit length; ρ is the resistivity, which is related to the material and temperature; W is the actual width of the heating area, δ is the actual heating thickness of the heating sheet per unit length, and I is the current passing through each heating area.

[0023] The calculation formula for the equivalent R resistance is: Combination Figure 2 In a specific implementation of this embodiment, ρ is 0.74Ω / mm 2 *m (20℃), take the etching spacing l as 100um, the width of the heating section w in the heating part as 1mm, the overall thickness of the heating part as 0.08mm, the etching depth corresponding to R3 is 10um, δ3 is 0.07mm; the etching depth corresponding to R1 is 20um, δ1 is 0.06mm; the calculation results are: The corresponding area has the largest average thickness and the smallest equivalent resistance. The average thickness of the corresponding area is the smallest and the equivalent resistance is the largest. That is, the larger the thickness, the smaller the equivalent resistance. When the same current flows through the equivalent series circuit, the larger the thickness, the smaller the heat generated. It can be calculated that the resistance variation range from the middle of the heating part to both sides is 16.7%.

[0024] Since the heating element is connected in series from the edge to the center, combined with the unit length resistance heat formula: , we can calculate and The heat value ratio: That is, the heat per unit length of the central area of ​​the heating part is 85.72% of the heat per unit length of the outer area. Therefore, the heat generation in the middle area of ​​the heating part is small and the heat dissipation capacity is low, while the heat generation in the edge area is large and the heat dissipation capacity is good, which can effectively solve the problem of uneven temperature distribution caused by the difference in heat dissipation capacity of different areas, thereby improving the uniformity of temperature distribution in various areas of the heating part. In this embodiment, the above parameters are only exemplary and cannot be understood as limitations of the present invention.

[0025] In this embodiment, Figure 1 101 in the figure represents a metal sheet, 102 represents a groove pattern formed on the surface of the intermediate, 103 represents a heating portion, 104 represents an electrode, and 105 is a pin. When the heating sheet is working, current flows between the two electrodes. The substrate sheet is a metal sheet, and the metal sheet can be a metal such as iron, chromium, aluminum, or a related alloy sheet. The top surface and the bottom surface of the metal sheet are parallel, and the resistance change of the heating sheet that is too thin or too thick is not obvious. Therefore, the distance between the top surface and the bottom surface can be 0.05-0.15mm, preferably 0.07mm. In this embodiment, a groove can be provided on the surface of the metal sheet.

[0026] In the above step S100, the pretreatment process includes: etching the metal sheet to obtain an intermediate having an undulating concave-convex structure on the surface; wherein the depth of the grooves on the intermediate gradually increases from the middle to both sides. Specifically, the process of etching the metal sheet includes: single-sided etching of the metal sheet, or double-sided etching of the metal sheet. Preferably, single-sided etching is performed. The etching method can be one of chemical etching, electrolytic etching, laser etching, and ultrasonic etching. In this embodiment, electrolytic etching is preferably used for pretreatment, which is simple to operate and low in cost.

[0027] Specifically, step S100 includes: S101. Cover the area on the metal sheet surface that does not need to be etched with a resist to obtain a covering body with the area to be etched; wherein, the area to be etched is the area on the metal sheet surface that is not covered by the resist. S102. Etch the area to be etched, and control the etching amount per unit distance of the etching area to gradually increase from the middle of the area to be etched to both sides; remove the remaining resist on the metal sheet to obtain an intermediate. More specifically, the above step S102 includes: etching the area to be etched using one of ferric chloride etching solution, ammonium persulfate etching solution, sulfuric acid / chromic acid etching solution, and sulfuric acid / hydrogen peroxide etching solution. In this embodiment, it is preferred to use FeCl3+HCl solution to etch the area to be etched.

[0028] Further, in this embodiment, the above step S101 includes: S1011, coating a resist on the metal sheet and drying it; wherein the resist is one of UV photoresist, screen printing ink, and laser ink; S1012, exposing and developing the metal sheet coated with the resist to obtain a covering body. Specifically, before coating the resist, the metal sheet needs to be cleaned to remove dirt, dust, etc. on the surface of the material. Then, further exposure and development operations are performed according to actual needs.

[0029] Furthermore, in this embodiment, step S1012 includes: performing patterned exposure on the to-be-etched surface of the metal sheet coated with the resist, so that the unexposed area on the to-be-etched surface is displayed as a target etching pattern; wherein the target etching pattern is at least one of a circle, an ellipse, a polygon, a strip, a curve, and a broken line, and the target etching pattern is arranged at intervals or in a mesh shape; using a preset chemical reagent to wash away the resist in the unexposed area to obtain a covering body. Preferably, UV glue is used as the resist of this embodiment, and the target etching pattern can be set as a strip pattern arranged at intervals.

[0030] In this embodiment, the following three specific etching processes are provided: In the first implementation of this embodiment, the above-mentioned step S102 includes: S1021a, fixing the covering body on the anode of the mobile electrolytic etching device, and making the area to be etched face the cathode of the mobile electrolytic etching device; S1022a, turning on the etching so that the depth of the groove formed on the surface to be etched gradually increases from the middle to both sides, and obtaining a groove corresponding to the target etching pattern shape.

[0031] In this embodiment, step S1022a further includes: when the amount of current is the same, adjusting the moving speed of the cathode to adjust the etching depth of different areas, so as to obtain a groove corresponding to the target etching pattern shape.

[0032] Specifically, Figure 3As shown, the movable cathode electrode can move on a plane parallel to the anode. During the etching cycle, the negative electrode is controlled to move at a non-uniform speed on a plane parallel to the positive electrode plate; the etching amount is also the amount of material removed from the metal sheet. Where the negative electrode moves at a lower speed, the relative etching time of the position will increase, and the etching amount will also increase accordingly, so that the depth of the grooves at different positions in the area to be etched can be controlled. In this embodiment, the moving speed of the cathode electrode in the area to be etched is controlled to gradually decrease from the middle position to both sides. After a complete etching cycle, the grooves formed on the surface of the metal sheet show a trend of gradually increasing depth from both sides to the middle. Considering that when preparing the heating sheet, some pins will be set on its outside, and the pins also have thermal conductivity, therefore, during the etching process, the moving speed of the cathode electrode can be controlled to gradually decrease from the middle to the surroundings, so that the grooves formed in the area to be etched have a trend of gradually increasing depth from the middle to the surroundings.

[0033] In a second implementation of the present embodiment, the electrode used to etch the metal sheet includes an anode and a cathode, the side of the anode close to the cathode is a plane, and the distance between the cathodes gradually decreases from the middle to the sides; the above-mentioned step S102 includes: fixing the exposed and developed metal sheet between the anode and the cathode, and making the area to be etched face the middle of the side of the cathode close to the anode; electrifying the electrode for etching to obtain a groove corresponding to the shape of the target etching pattern.

[0034] Specifically, Figure 4 As shown, a negative electrode of a specific shape is customized, and the distance between different areas on the cathode and the anode is changed by changing the shape of the electrode. The current density in different areas is changed by adjusting the distance between the corresponding areas of the two electrodes, so that the groove formed in the area to be etched has a tendency to gradually increase in depth from the middle to the sides. The cathode electrode used is thin in the middle and thick on both sides, so that the distance from the cathode to the anode shows a tendency to gradually decrease from the middle to the sides. Of course, in some other embodiments, the cathode electrode can also be designed to be thin in the middle and thick at the edges, so that the distance from the cathode to the anode gradually decreases from the middle to the outside, and the groove formed in the area to be etched finally has a tendency to gradually increase in depth from the middle to the surroundings.

[0035] In a third implementation of the present embodiment, the electrode for etching the metal sheet includes an anode and at least three cathodes arranged in parallel above the anode. The above step S102 includes: fixing the exposed and developed metal sheet between the anode and the cathode; controlling each cathode to etch at the corresponding position of the area to be etched according to the preset duty cycle of the electrode, so as to obtain a groove corresponding to the shape of the target etching pattern; the duty cycle is the ratio between the power-on time of the target cathode and the sum of the power-on time of all cathodes. Among them, the duty cycles corresponding to the cathodes arranged in sequence are gradient-changed; the gradient change trend is shown as first decreasing and then increasing.

[0036] Specifically, Figure 5 As shown, the etching electrode includes a plurality of cathodes arranged at intervals above the anode, and each electrode plate can control the power-on time individually. In actual application, an etching electrode group with 11 cathodes can be used to etch the covering body, and the duty ratios of the cathodes arranged in sequence can be set to 90%, 70%, 60%, 60%, 50%, 50%, 50%, 60%, 60%, 70%, and 90%, respectively; the etching process is adjusted by adjusting the duty ratio corresponding to each cathode, and finally a groove corresponding to the target etching pattern shape is etched.

[0037] In this embodiment, the substrate sheet can be a metal substrate whose distance between the top surface and the bottom surface gradually decreases from the middle to the two sides; the pretreatment operation is at least one of chemical etching, sandblasting, and grinding. The intermediate with a rough surface is obtained through the above pretreatment operation. The heating sheet formed by processing the intermediate with a rough surface also has a large surface area. It can also ensure the uniform temperature distribution of the heating part while improving the oil adsorption efficiency of the heating wire to a certain extent, and the atomization effect is also improved to a certain extent.

[0038] By using the above method in this embodiment, a heating sheet having the following properties can be obtained: The heating sheet includes: a heating part 01 and electrodes 02 respectively connected to opposite sides of the heating part 01; the average thickness per unit distance of the heating part 01 gradually decreases from the middle toward the electrode 02, and the unit distance is greater than or equal to 100um.

[0039] Specifically, the unit distance can be 100 um, 110 um, 120 um, etc., preferably 100 um. In this embodiment, the heating of the heating sheet conforms to the Joule heating effect, and the heating portion 01 has the characteristic that the average thickness per unit distance gradually decreases from the middle to both sides, that is, the average thickness per unit distance in the B region is less than the average thickness per unit distance in the A region. The resistance per unit distance of the heating portion 01 has a trend of gradually increasing from the middle to both sides, so that the heating power of the heating portion 01 also shows a characteristic of gradually increasing from the middle to both sides, which can reduce the problem of uneven temperature distribution caused by the difference in heat dissipation capacity of different regions of the heating portion 01, effectively offset the actual heat loss, and make the actual temperature distribution on the surface of the heating portion 01 more uniform, thereby increasing the proportion of effective atomization area.

[0040] In the present embodiment, the heating part 01 is a heating wire, and the shape of the heating wire can be at least one of a polygon, an S-shape, a flat fold line, a butterfly-wing shape, a flat wave shape, a flat sawtooth shape, a flat spiral shape, and a circle. The cross-sectional width of the heating wire is 0.01-1mm. Preferably, the cross-sectional width of the heating wire is set to 0.08mm, and the width refers to the cross-sectional thickness in the horizontal direction. The heating wire includes at least two heating segments connected between the two electrodes 02 and spaced apart and a supporting segment connected between two adjacent heating segments. The heating sheet also includes a pin connected to the outermost heating segment and extending outward, and the pin can play a role of fixing and heat conduction.

[0041] In some embodiments, the heating section can be two sections, or three sections or more. The heating portion 01 has two heating sections, both of which are plane fold lines and parallel to each other, and the turning points of the heating sections protruding toward the outside of the heating portion 01 are connected to the pins respectively. The heating wire can be prepared by stamping a metal sheet using a preset template. When the heating sheet is working, the heat generated by the outside of the heating portion 01 can be derived from the surface of the heating portion 01, the electrode 02 and the pin, and the pin and the electrode 02 are both connected to the outside of the heating portion 01, and the area near the electrode 02 and the area near the pin in the heating portion 01 have strong heat dissipation capacity. Of course, in some other embodiments, the heating wire can also be obtained by combining multiple shapes, for example: a combination of a plane wavy shape and a circular shape. The width of different parts of the heating wire can be the same or different, for example: the width of the heating wire in the middle area of ​​the heating portion 01 is larger, and the width of the edge area is smaller, thereby, it can also achieve the effect of improving the uniformity of the temperature distribution of the heating portion 01 to a certain extent.

[0042] In this embodiment, at least one surface of the heating part 01 is formed with an undulating concave-convex structure, so that the heating part 01 has a larger heat-conducting contact area, the surface temperature is enhanced, and when it is attached to the oil-conducting body, the smoke oil adsorption efficiency is improved, and the atomization effect can also be improved. The top and bottom surfaces of the heating part 01 are parallel, which is convenient for installation. The resistance change of a heating sheet that is too thin or too thick is not obvious. Therefore, in this embodiment, the distance between the top and bottom surfaces can be 0.05-0.15mm, preferably 0.07mm.

[0043] Furthermore, if Figure 1 The structure corresponding to the middle a part, in this embodiment, can be provided with grooves on the surface of the heating part 01, and a concave-convex surface is formed by the groove structure to increase the surface area of ​​the heating part 01. Specifically, a groove is provided on at least one surface of the heating part 01. The arrangement density of the grooves on the surface of the heating part 01 gradually increases from the middle of the surface of the heating part 01 to the direction close to the electrode 02. The depth of the groove gradually increases from the middle of the surface of the heating part 01 to the direction close to the electrode 02. The depth range of the groove on the heating part 01 is 5-40um. A plurality of long strip grooves are arranged at intervals on one surface of the heating part 01. The spacing between adjacent grooves is 60-300um, and the spacing between adjacent grooves is less than the unit distance. It should be noted that in this embodiment, the shape setting of the heating wire does not conflict with the shape, arrangement position and other settings of the grooves. The grooves are distributed on the surface of the heating wire, and the shape of the heating wire can be multiple choices.

[0044] In some embodiments, a groove is provided on one of the surfaces of the heating part 01 to form the required concave-convex structure and increase the thermal contact area. Of course, grooves can also be provided on both surfaces of the heating part 01. The depth and arrangement of the grooves are set according to actual needs and are not limited here. The grooves can be prepared by etching. Of course, in some other embodiments, a rough surface can also be obtained by sandblasting, chemical etching, etc., so as to increase the thermal contact area.

[0045] In some embodiments, the groove depths of each region of the heating portion 01 are the same, and the arrangement density of the grooves on the surface of the heating portion 01 is controlled to gradually increase from the middle of the surface of the heating portion 01 toward the direction close to the electrode 02. The arrangement of the grooves in the middle region of the heating portion 01 is made more sparse, and the arrangement of the grooves in the edge region is made more dense, so that the average thickness per unit distance of the heating portion 01 has the characteristic of gradually decreasing from the middle to the direction close to the electrode 02, and the heating power of the heating portion 01 also shows the characteristic of gradually increasing from the middle of the heating portion 01 toward the direction close to the electrode 02.

[0046] In some embodiments, the grooves on the surface of the heating part 01 can also be arranged in a form in which the depth gradually increases from the middle of the surface of the heating part 01 toward the direction close to the electrode 02, so that the average thickness per unit distance of the heating part 01 gradually decreases from the middle to the direction close to the electrode 02, so that the heating power of the heating part 01 also shows the characteristic of gradually increasing from the middle of the heating part 01 toward the direction close to the electrode 02. The depth of the grooves in the entire heating part 01 varies from 10 um to 20 um from the middle to both sides.

[0047] It is understandable that in this embodiment, the average thickness per unit distance of the heating part 01 can be controlled by controlling the arrangement density of the grooves in each area of ​​the heating part 01, or the average thickness per unit distance of the heating part 01 can be controlled by only controlling the depth of the grooves in each area, and the groove structure on the surface of the heating part 01 can be set in combination with these two methods. In addition, the grooves on the heating part 01 can also be set in a form in which the arrangement density gradually increases from the middle of the surface of the heating part 01 to the surroundings, and / or the depth gradually increases from the middle of the surface of the heating part 01 to the surroundings.

[0048] In the present embodiment, at least one surface of the heating portion 01 is provided with grooves arranged at intervals or distributed in a mesh. The shape of the groove is at least one of a circle, an ellipse, a polygon, a strip, a curve, and a broken line. Regardless of whether the grooves are arranged at intervals or distributed in a mesh, the shape of the grooves can be one or more combinations of a circle, an ellipse, a polygon, a strip, a curve, and a broken line. It should be noted that when a plurality of grooves arranged at intervals are provided on the surface of the heating portion 01, the spacing between adjacent grooves can be the same or different. Of course, in some other embodiments, the grooves can also be irregular shapes, as long as it is ensured that the arrangement depth (or arrangement density) per unit distance in the heating portion 01 has a regular characteristic of gradually increasing from the center to the direction close to the electrode 02, and no limitation is made here.

[0049] like Figure 6 As shown, in a specific implementation of this embodiment, a plurality of long strip grooves are arranged at intervals on one surface of the heating portion 01, and the grooves are parallel to each other, and the spacing between adjacent grooves is equal. The grooves on the surface of the heating portion 01 are arranged so that the depth gradually increases from the middle of the surface of the heating portion 01 toward the electrode 02; the parts a marked in the A area and the B area in the figure are all etched parts, and the parts b marked in the A area and the B area are all unetched parts. The distance from the bottom of the groove in the A area to the bottom side of the heating portion is d1, and the distance from the bottom of the groove in the B area to the bottom side of the heating portion is d2. , so that the groove depth in area B is greater than the groove depth in area A, and the length extension direction of the groove can be perpendicular to the direction in which the groove depth in the heating part 01 increases (or decreases). The number of grooves is preferably 20, and of course it can also be 18, 25, 30, etc., which can be determined according to parameters such as the width and thickness of the actual heating part 01, and is not limited here. The depth variation law of each groove arranged in sequence can be followed by first decreasing one by one and then increasing one by one; the depth variation law of each groove arranged in sequence can also be followed by first decreasing in a step-by-step manner and then increasing in a step-by-step manner, and each step is in units of two or three grooves. The spacing between adjacent grooves is less than the above-mentioned "unit distance"; the spacing between adjacent grooves can be 100um, 110um, 120um, etc., preferably, 100um.

[0050] In another specific implementation of this embodiment, the groove can be a mesh groove formed by interlacing and connecting a plurality of long strip grooves. The shape of the grooves connected as one can be a diamond mesh or a triangular mesh, etc. The arrangement density of the grids formed by the grooves in various areas of the surface of the heating part 01 is equal, and the depth of the mesh grooves in the middle area increases from the middle to the two sides close to the electrode 02. The depth of the grooves in the entire heating part 01 varies from the middle to the two sides in a range of 10 um to 20um.

[0051] It should be noted that, in this embodiment, the specific parameters such as the ranges and sizes involved in the above-mentioned embodiments are only exemplary, intended to analyze and illustrate the present invention, and cannot be understood as limitations of the present invention. In this embodiment, for the scheme of controlling the average thickness per unit distance by setting grooves, multiple sets of parallel implementation schemes are included, and the setting of the grooves can simultaneously have the above-mentioned shape, quantity, arrangement form, depth adjustment law, arrangement density law and other corresponding technical features, or only have some of the technical features.

[0052] In one implementation of the present embodiment, the distance between the top surface and the bottom surface of the heating part 01 gradually decreases from the middle to the direction close to the electrode 02. Among them, the substrate sheet used to prepare the heating part 01 is a metal sheet that is thick in the middle and thin on both sides, and a concave-convex structure is formed on the top surface and / or the bottom surface of the metal sheet, so that the heating part 01 has at least one rough surface. That is, the metal sheet has a rough surface, and its rough surface can be processed by chemical etching, sandblasting, grinding, etc.; so that after the metal sheet is stamped and formed into a heating sheet, the top surface and / or the bottom surface of the heating part 01 also has a concave-convex structure. The heating part 01 with a concave-convex structure on the surface has a larger heat exchange area than the heating part 01 with a smooth surface, and the surface temperature of the heating part 01 is enhanced, which improves the smoke oil adsorption efficiency of the heating wire to a certain extent, and the atomization effect is also improved to a certain extent.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for processing a heating sheet, characterized in that: The following steps are involved: Providing a substrate sheet, and pre-treating the substrate sheet to obtain an intermediate body whose average thickness per unit distance gradually decreases from the middle to both sides; Remove excess material from the intermediate to obtain a heating sheet of a target shape; wherein the heating sheet includes a heating portion and electrodes respectively connected to opposite sides of the heating portion, the middle portion of the intermediate corresponds to the middle portion of the heating portion, and the direction of the middle portion of the heating portion toward the electrode is the same as the direction in which the average thickness of the intermediate decreases.

2. The method for processing a heating sheet according to claim 1, characterized in that: The substrate sheet is a metal sheet, and the pretreatment process includes: The metal sheet is etched to obtain the intermediate body having an undulating concave-convex structure on the surface; wherein the depth of the grooves on the intermediate body gradually increases from the middle to both sides.

3. The method for processing a heating sheet according to claim 2, characterized in that: The step of etching the metal sheet comprises: Covering the area on the surface of the metal sheet that does not need to be etched with a resist to obtain a covering body with the area to be etched; Etching the area to be etched, and controlling the average etching amount per unit distance of the etched area to gradually increase from the middle of the area to be etched to both sides; The remaining resist on the metal sheet is removed to obtain the intermediate.

4. The method for processing a heating sheet according to claim 3, characterized in that: The step of etching the area to be etched and controlling the etching amount per unit distance of the etching area to gradually increase from the middle of the area to be etched to both sides includes: Fixing the covering body on the anode of the mobile electrolytic etching device, and making the area to be etched face the cathode of the mobile electrolytic etching device; The etching is performed by power-on, so that the depth of the groove formed on the surface to be etched gradually increases from the middle to both sides, thereby obtaining a groove corresponding to the shape of the target etching pattern.

5. The method for processing a heating sheet according to claim 4, characterized in that: The step of energizing etching further includes: when the amount of energization is the same, adjusting the moving speed of the cathode to adjust the etching depth of different areas, so as to obtain a groove corresponding to the shape of the target etching pattern.

6. The method for processing a heating sheet according to claim 3, characterized in that: The electrode used for etching the metal sheet includes an anode and a cathode, the side of the anode close to the cathode is a plane, and the distance between the cathode and the anode gradually decreases from the middle to both sides; the step of etching the area to be etched and controlling the etching amount per unit distance of the etching area to gradually increase from the middle to both sides of the area to be etched includes: Fixing the exposed and developed metal sheet between the anode and the cathode, and making the area to be etched face the middle of the cathode on one side close to the anode; The electrode is energized to be etched to obtain a groove corresponding to the target etching pattern shape.

7. The method for processing a heating sheet according to claim 3, characterized in that: The electrode for etching the metal sheet includes an anode and at least three cathodes arranged in parallel above the anode; the step of etching the area to be etched and controlling the etching amount per unit distance of the etching area to gradually increase from the middle of the area to be etched to both sides includes: Fixing the exposed and developed metal sheet between the anode and the cathode; Each cathode is controlled to etch at the corresponding position of the area to be etched according to the preset duty cycle of the electrode to obtain a groove corresponding to the target etching pattern shape; the duty cycle is the ratio between the power-on time of the target cathode and the sum of the power-on time of all cathodes.

8. The method for processing a heating sheet according to claim 7, characterized in that: The duty ratios corresponding to the cathodes arranged in sequence are changed in a gradient manner; the trend of the gradient change is to decrease first and then increase.

9. The method for processing a heating sheet according to claim 3, characterized in that: The step of exposing and developing the metal sheet coated with the resist comprises: The surface to be etched of the metal sheet coated with the resist is subjected to patterned exposure, so that the unexposed area on the surface to be etched is displayed as a target etching pattern; wherein the target etching pattern is at least one of a circle, an ellipse, a polygon, a strip, a curve, and a broken line, and the target etching pattern is arranged at intervals or distributed in a mesh shape; The resist in the unexposed area is washed away with a preset chemical reagent to obtain the covering body.

10. The method for processing a heating sheet according to claim 2, characterized in that: The process of etching the metal sheet includes: single-sided etching of the metal sheet, or double-sided etching of the metal sheet.

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