Double convection and conduction furnace for flower sticks

Abstract

A heating furnace for use with a non-combustion portable heating device for the delivery of vaporized natural consumables and a method for operating the furnace are disclosed. The furnace heats flower sticks filled with natural consumables to vaporize volatile substances for inhalation and enjoyment by the user. The furnace operates by both conduction and convection through a woven wire filter with high surface area and thermal mass to enable rapid heat transfer and temperature stabilization. The furnace operates according to one or more temperature profiles during the heating session.

Description

Technical Field

[0001] [[ID=5〗 Cross - reference to related applications This application claims the benefit of the previously filed U.S. Patent Application Publication No. 63 / 059,894, filed on July 31, 2020, under the title “​​Dual Convection and Conduction Oven for Flower Stick,” the entire content of which is incorporated herein by reference.

Background Art

[0002] Background of the Invention The present invention relates generally to heating devices for heating single - use flower sticks or flower cartridges that facilitate the smokeless delivery of active ingredients and volatile compounds released from a certain amount of natural consumables pre - filled in the stick. The heating device is used to evaporate the natural consumables in the cartridge by convective heating of the surrounding air and conductive heating of the stick through contact with the surface area, thereby releasing volatile compounds at a specific temperature profile.

[0003] A flower stick (also known as a flower cartridge) dispenses a certain amount of natural consumables including ground flowers and plants. Such a stick can dispense an accurate dose of natural consumables for predictable and planned enjoyment by the user. A stick containing natural consumables in the form of ground flowers or plants can enable the extraction and delivery of active ingredients and volatile compounds.

[0004] Conventionally, smokers have relied on the combustion of natural consumables in the form of cigarettes or other auxiliary devices to inhale active ingredients. The present invention relies on heat - non - combustion technology, and instead of combustion, only heating is performed to raise the temperature of the natural consumable above the evaporation temperature of the active ingredient but below the combustion temperature. The stick pre - filled with natural consumables eliminates the need for the user to individually load the natural consumable into the heating or combustion device and also eliminates the need to rely on a source of ignition.

[0005] The materials used to manufacture the sticks are non-combustible, both within the normal operating range of the heating device and at the evaporation temperature of the active ingredients, so that the sticks and natural consumables can be heated to various temperatures for the extraction of desired chemicals by convection of heated air and conduction with the furnace walls, rather than by combustion. The "smokeless" characteristic of the sticks helps mitigate the harmful health effects associated with smoking.

[0006] Patent disclosures relating to the construction and filling of sticks / cartridges can be found in U.S. Patent Application Publication No. 16 / 509,469, entitled "Flower Cartridge Crimping and Filling for Herb Delivery," filed on 11 July 2019, and in International Publication No. PCT / US2019 / 41499, entitled "Flower Cartridge for Herb Delivery," also filed on 11 July 2019, the entire contents of which are incorporated herein by reference. [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] Accordingly, in this field, there is a need for an improved furnace as an integrated element of a novel portable heating device for the delivery of evaporated natural consumables, which operates by both convection of heated air and conduction through contact between the stick and the furnace wall. [Means for solving the problem]

[0008] Brief summary of the invention This invention utilizes a dual convection-convection furnace. For illustrative purposes, a vaporizer using only conduction draws cold air into the furnace when the user inhales, cooling the contents and resulting in reduced output and a disappointingly "cold" experience during heavy inhalations. On the other hand, a vaporizer using only convection requires a considerable increase in temperature with each inhalation, such that a portion of the stick may reach or exceed the carbonization temperature before the natural consumables furthest from the heat source are activated. Using both convection and conduction allows the vaporizer to maintain the contents at an optimal temperature during the user's inhalation while preserving flexibility when the air is actively circulated.

[0009] Furthermore, features such as controlling the heating of the flower stick and using a woven wire filter with a high surface area, high thermal mass, high thermal conductivity, and specific surface characteristics of the woven wire filter itself can be achieved.

[0010] According to an aspect of the present invention, a heating furnace is located within a portable heating device that, when combined with a flower stick containing natural consumables, can deliver evaporated material in the required dose at a preset temperature profile.

[0011] The heating furnace is operable by an electrical signal and turns on when current is applied to the heater coil located near the bottom of the furnace. The electrical signal is generated via the activation of one or more stick switches located near the top of the furnace. When the user inserts a stick to begin a heating session, the stick is mechanically guided through a stick guide as it is inserted into the furnace. Two stick switches, each embedded in its own switch holder and thus embedded in the guide, are activated when the stick presses them, which starts the heating cycle and turns on the heater coil.

[0012] The heater coil functions by transferring heat through convection into the airflow passing through it, and also by conduction, heating the main furnace tube, the second furnace tube, the first braided wire filter, and the second braided wire filter. An insulating blanket is positioned concentrically outside the furnace tube to help retain heat. A temperature sensor is positioned between the two braided wire filters and is also attached to the main furnace tube.

[0013] The inserted stick is mechanically guided downwards through the main furnace tube until it contacts the second braided wire filter and is properly positioned for the duration of the heating session. Heat from the main furnace tube preheats the stick and the natural consumables inside through conduction. The furnace top gasket creates an interference fit with the stick above the main furnace tube, and the main furnace tube forms an interference fit with the inserted stick.

[0014] The stick functions as a mouthpiece, through which the user inhales the evaporated consumables. When the user inhales through the stick, negative pressure is created, causing ambient air to enter the furnace in the space between the stick and the stick guide, and to flow out of the guide through pre-formed channels leading to one or more air tubes located longitudinally close to the insulating blanket.

[0015] Air travels downwards through the tube towards the bottom of the furnace until it enters the base assembly, where it enters the cavity just below the heater coil. The negative pressure pulls the air upwards into the coil, where convective heat transfer occurs. Additional heat transfer occurs as the air flows upwards into the first and second braided wire filters. These filters are made of thin wires compressed into a cylindrical shape, and when placed in the air path, their high surface area is adapted to regulate the air to the appropriate temperature as it enters the stick just above the second braided wire filter.

[0016] In an exemplary embodiment, the heating furnace is adapted to raise and lower the temperature of the stick and contents according to an ideal temperature profile. Such a profile requires the furnace to raise and maintain the stick temperature to about 195°C, which is above the evaporation temperature of most of the active ingredients but below the temperature that causes carbonization or combustion. Towards the end of the session, the profile raises the stick temperature to about 220°C, releasing a second set of volatile compounds.

[0017] An ideal temperature profile cannot always be maintained, as it depends on environmental and user conditions. In another embodiment, a desirable temperature profile requires the heating element to raise the furnace temperature profile to 200-300°C, and then gradually reduce the input power to cause changes in natural consumables as the session progresses. Towards the end, the temperature profile requires the furnace temperature to rise above 200°C to facilitate the release of a second set of volatile compounds.

[0018] The power applied to the furnace only roughly corresponds to the furnace temperature profile in actual use. Many factors can affect the actual furnace temperature, and therefore the actual stick temperature. For example, heating must be significantly increased when the user draws air from the device and circulates a large amount of ambient air in the furnace in a short period of time. The furnace temperature sensor can detect these fluctuations and change the amount of power supplied to the device according to the conditions. In another embodiment, the furnace temperature rises with each draw as it warms up to a certain value, which minimizes the time the stick temperature exceeds 200°C.

[0019] Brief explanation of the drawing The various embodiments disclosed herein, and their and other features and advantages, will be better understood with respect to the following description and drawings, where similar numbers refer to similar parts. [Brief explanation of the drawing]

[0020] [Figure 1A] It is a perspective view of a portable heating device. [Figure 1B] It is a perspective view of a flower stick. [Figure 1C] It is a cross-sectional view of a flower stick. [Figure 2A] It is a perspective view of a heating furnace and a flower stick. [Figure 2B] It is a perspective view of a heating furnace rotated 90 degrees. [Figure 2C] It is a cross-sectional view of a heating furnace. [Figure 2D] It is a cross-sectional view of a heating furnace with a flower stick inserted. [Figure 2E] It is an elevation view of a heating furnace where the air pipe can be seen. [Figure 2F] It is a cross-sectional view of the air pipe inside the heating furnace. [Figure 2G] It is an exploded view of the main heating furnace components. [Figure 2H] It is a detailed view of the second braided wire filter. [Figure 2J] It is a detailed view of the first braided wire filter. [Figure 3A] It is a graph showing the ideal temperature profile of a flower stick. [Figure 3B] It is a graph showing the temperature profiles of the furnace and the stick. [Figure 3C] It is a graph showing an additional embodiment of the temperature profile.

Mode for Carrying Out the Invention

[0021] Detailed Description The figures referred to in this specification are intended to illustrate the preferred embodiments of the present invention and are not intended to limit it.

[0022] Figure 1A shows an embodiment of a portable heating device adapted for use with a flower stick 250 by insertion through a hole near the top of the device, as shown in Figure 1B. Figure 1C is a cross-sectional view of the flower stick with the insertion end facing downwards. The mouthpiece end is empty, while the insertion end is filled with a natural consumable 251. The stick is disclosed in detail in U.S. Patent Application Publication No. 16 / 509,469, entitled "Flower Cartridge Crimping and Filling for Herb Delivery".

[0023] Figure 2A shows an embodiment of a heating furnace 200 equipped with flower sticks 250. Stick guides 203 physically align the sticks for proper positioning within the furnace, and PCB strips 223 help create an airtight seal while ensuring proper electrical connections. An insulating blanket 214 forms an outer shell to help retain heat and is visible in this figure as the outer "wall" of the furnace.

[0024] Figure 2B is a rotated view of the furnace to show additional elements, particularly the top gasket 217, the air pipe 218, and the base assembly 219.

[0025] Figure 2C is a cross-sectional view of a heating furnace without a stick, showing the positioning of the stick guide 203 and the spine 221 positioned within the internal cavity of the guide. When the stick is present, the spine creates a space between the stick and the stick guide, allowing air to circulate. Also shown are the furnace top gasket 217 and the base assembly 219. Furthermore, one or more stick switches 202 are embedded in their respective switch holders 204. The switches are shown in their "off" position, with the mechanical switches protruding into the cavity without the stick.

[0026] Figure 2D is a cross-sectional view of the heating furnace with the flower stick 250 inserted. Natural consumables 251 are present inside the stick, and their approximate filling level is coplanar with the furnace top gasket. The stick reaches its proper position when it comes into contact with the second braided wire filter 213. The filling level is configured such that the portion of the stick that forms an interference fit with the main furnace tube 210 is also filled with natural consumables, achieving optimal heating of the consumables by conduction. The furnace top gasket 217 may be made of silicone and creates an interference fit with the stick above the main furnace tube, while also preventing air from passing through the gasket when the stick is inserted.

[0027] The heating furnace is operable by an electrical signal and begins heating when current is applied to the heater coil 201. The electrical signal is generated via the activation of one or more stick switches 202. When a user inserts a stick to start a heating session, as shown in Figure 2D, the stick is mechanically guided through a stick guide 203 as it is inserted into the furnace. The stick switches, each embedded in its respective switch holder 204, are activated when the stick presses them, exciting a signal for the heater coil. The switches are shown in their retracted position, or "on" position. The signal is transmitted to control the electrical circuitry via PCB strips that are wrapped around the stick guide and soldered to the stick switches. The PCB strips also serve to reduce air leakage around the stick guide.

[0028] The heater coil functions by transferring heat through convection into the airflow passing through it, and also by conduction, heating the main furnace tube 210, the second furnace tube 211, the first braided wire filter 212, and the second braided wire filter 213. The main furnace tube includes two segments: one with a larger diameter adapted to fit the flower sticks arranged concentrically in close proximity to the coil, and another with a smaller diameter configured to be slightly larger than the diameter of the heater coil. The main furnace tube is therefore adapted to absorb a substantial portion of the thermal energy from the coil and direct it to the rest of the furnace tube and the braided wire filters, thereby heating the flower sticks and natural consumables.

[0029] Heat can also be transferred through convection of warm air between any of these components to help distribute thermal energy. Insulator blankets 214 are positioned concentrically outside the furnace tube to help retain heat. A first temperature sensor 215 is placed in a pre-formed notch of a first braided wire filter and detects the temperature near the heating element. A second temperature sensor 216 is attached to the main furnace tube and detects the temperature near the flower stick. The temperature sensors should be rated at least 300°C.

[0030] In other embodiments, the furnace can operate without a second temperature sensor, and the heater coil can be replaced with any suitable heating element.

[0031] Figures 2E and 2F show a heating furnace equipped with an air tube, with the air tube facing the viewer, and the cross-sectional view shows the path of ambient air as it passes through the device. The stick is a mouthpiece, from which the user inhales evaporated consumables. When the user inhales through the stick, a negative pressure is created, and ambient air enters the furnace in the space between the stick and the stick guide 203. The air flows downward into a pre-formed channel 222 in the furnace top gasket 217 leading from the stick guide to the air tube 218, where the air moves downward along the tube toward the bottom of the furnace until it enters a cavity 220 in the base assembly 219 just below the heater coil.

[0032] Returning to Figure 2D, the negative pressure draws the air pooled in cavity 220 upward into the coil, causing convective heat transfer within the coil. At this point in the session, the braided wire filter is preheated by conduction, and heat is directly passed through the joined components. Additional heat transfer occurs as the warm air flows upward into the first and second braided wire filters, reaching the appropriate temperature as the warm air flows into the stick and heats the natural consumables inside.

[0033] Braided wire filters are shown in Figures 2G and 2H. These are made of metal wire that is compressed into a cylindrical shape and adapted to fit inside the furnace tube. These features allow the filters to have a high surface area, thermal mass, and conductivity. Their excellent conductivity also allows them to function as a heat sink / thermal buffer to help equalize temperature fluctuations caused by the user's inhalation from the stick, which can intermittently move large amounts of air. The choice of materials in constructing the components that are primarily involved in convection heating means that their temperature is maintained at a higher temperature than that of the conductive components.

[0034] In exemplary embodiments, the first braided wire filter 212 may include slots, grooves, or notches suitable for facilitating the positioning of the first temperature sensor 215. This filter is positioned closest to the heater coil and is made of aluminum, which has higher thermal conductivity and lower thermal mass than steel, meaning that the filter readily transfers heat to the circulating air, heating and cooling rapidly and responding more sensitively to heat transfer.

[0035] The second braided wire filter 213, positioned closest to the stick, is made of stainless steel, which has lower thermal conductivity and higher thermal mass than aluminum. This filter serves to retain heat and regulate the airflow and the temperature of the furnace tube above it.

[0036] In another exemplary embodiment, any other metal having suitable thermal properties, low toxicity, and non-corrosiveness, such as brass or copper, may be used. The first braided wire filter has an approximate density of 1.11 g / cm³. 3 The second woven wire filter has an approximate density of 2.5 g / cm³. 3 The exemplary wire thickness can range from 0.05 to 0.1 mm, and the wire thickness determines the effective surface area of ​​the metal available for heat exchange.

[0037] The first braided wire filter can transfer a large amount of heat to efficiently raise the temperature of a large volume of air as it passes through. In contrast, the second braided wire filter requires more energy to change its temperature and helps regulate fluctuations, acting as a temperature shield for the furnace tube, including the stick. These filters are adapted to regulate the air to the appropriate temperature when the stick is placed directly above the second braided wire filter.

[0038] Figure 2J shows an exploded view of the main components of the heating furnace as they are arranged. In particular, the furnace tube 210 with the positions of at least two separate diameter and temperature sensors 215 and 216 is shown more clearly.

[0039] Figure 3A is a graph showing the ideal temperature profile of a flower stick. The ideal stick temperature curve 300 changes depending on the session time. This change allows for the optimal release of different classes of volatile compounds during the session, as different volatile compounds in the natural consumables evaporate at different temperatures.

[0040] The first class compound 310, or "zone 1," may contain a terpene in the form of β-caryophyllene, β-sitosterol, α-pinene, β-mycrene, limonene, cannaflavin, or linalool, and a cannabinoid in the form of CBG, delta-9-THC, CBD, delta-8-THC, or CBN, with an evaporation temperature of 120 to 185°C. The second class compound 320, or "zone 2," may contain a terpene in the form of terpineol-4-ol, α-terpineol, or pulegone, and a cannabinoid in the form of CBC or THCV, with an evaporation temperature of 200 to 220°C.

[0041] However, it is known that heating the stick to a temperature above 200°C results in smoke and carbonization of both the stick and its contents. Heating the stick to a temperature above 300°C causes combustion. Therefore, the furnace is ideally configured to rapidly raise and maintain the temperature of the flower stick from room temperature to 185-200°C. This is achieved with an initial rapid warm-up of the furnace from room temperature to 200-300°C. This allows for the rapid release of Zone 1 compounds and evaporation of water within the natural consumables without the unpleasantness of experiencing the effects of smoke. This ideal heating profile also avoids the problems present in prior-technical heat-non-combustion devices, where the furnace gradually reaches the temperature, resulting in a poor user experience in the form of a warm-up and a cold mouth sensation.

[0042] Towards the end of the session, the furnace rapidly raises the stick temperature to over 220°C. This shorter portion of the session releases Zone 2 compounds and provides a "hot finish" experience, while the relatively shorter period of high temperature results in limited carbonization and smoke. At the end of the session, power to the heater coils is switched off and the furnace cools to room temperature.

[0043] Figure 3B shows the furnace temperature curve 302 in relation to the stick temperature curve 301. Initially, the furnace rapidly reaches a temperature of 200–300°C, achieving a rapid warm-up of the stick. As the stick approaches its target temperature for vaporizing the Zone 1 compound, moisture evaporates, and the furnace temperature decreases to maintain the stick at the target temperature. Towards the end of the session, the furnace heat is increased again to raise the stick to its final temperature.

[0044] The temperature measured by the sensor at any given time during a heating session and represented by the furnace temperature curve 302 only roughly corresponds to the desired stick temperature curve 301 for a given time in the heating profile. This stick temperature is measured during a test session, and an algorithm is derived during the test session to correlate the furnace temperature with the stick temperature; however, the actual stick temperature cannot be precisely determined during actual use by users outside the laboratory. Many factors, such as the moisture content of the natural consumables, the volume of active and volatile components, and the packaging density, affect this relationship. For example, a certain amount more energy is required to raise the temperature at the beginning of a heating session when the contents of the stick are drier and most of the volatile substances and active components are still present, compared to the later part of the session when the contents of the stick are drier and more of the active components and volatile compounds have evaporated. Heating must be significantly increased if the user draws in air from the device and circulates a large amount of cold air through the furnace in a short period of time. The furnace temperature sensor can detect these fluctuations and, in bursts of heating, can change the amount of power supplied to the device as needed.

[0045] Figure 3C shows two distinct operating modes and preferred methods for achieving additional temperature variations for the stick and natural consumables. Different types of natural consumables may require more appropriate temperature profiles to provide a satisfactory user experience. The graph shows the stick temperature as a result of the operation of the two modes, with the first mode 303 operating at a lower temperature than the second mode 304.

[0046] In this embodiment, when extracting active ingredients from plants through evaporation, it is desirable to ensure that evaporation of active and volatile ingredients is minimized when the stick is not being inhaled, so that as many ingredients as possible evaporate only when the user inhales air through the stick. This reduces the possibility of loss of active ingredients, premature drying, and carbonization of the plants. Therefore, it is desirable to maintain the contents of the stick at a set temperature below the evaporation temperature of the desired active ingredients, and to rapidly raise the temperature to a second predetermined temperature higher than the evaporation temperature of the desired ingredients during the period when the user is inhaling the device.

[0047] Initially, both modes undergo a warm-up period 305°C during which the stick temperature rapidly rises from room temperature to the initial target temperature via conduction only, as the user has not yet inhaled. Both modes then undergo a brief interruption in heating as the contents reach 100°C to constitute the latent heat of the evaporating water. The warm-up period ends when the first mode reaches a temperature of 167°C and the second mode reaches a static temperature of 170-175°C. The stick is now ready for the user to inhale.

[0048] When the user inhales the tobacco 306, the furnace must rapidly raise its temperature to approximately 190°C for the first mode and 220°C for the second mode in order to release the full range of the desired compounds. This is achieved during inhalation by both convection and conduction. When the user finishes inhaling, the power decreases and the stick temperature is allowed to drop to the target resting temperature. This continues throughout the session as multiple inhalations are made, with each inhalation occurring at varying durations and inhalation rates, as assumed by the curve shape. The furnace attempts to minimize the time spent in the "hot" zone when the user is not inhaling.

[0049] These short periods in which the stick temperature rapidly rises and then falls minimize the portion of the curve that results in the unpleasant experience of "smoking" in the form of combustion and particulate matter emission, where the stick exceeds 200°C. Both modes are also conceivable to gradually increase the target temperature depending on the elapsed time for the "hot finish" shown in Figures 3A and 3B.

[0050] The advantages of a dual convection-conduction furnace are evident in this invention. A vaporizer using only conduction draws cold air into the furnace when the user inhales, cooling the contents, reducing output, and giving an unexpectedly "cold" experience when drawing in large amounts. On the other hand, a vaporizer using only convection needs to raise the temperature by a considerable amount with each inhalation so that a portion of the stick can reach or exceed the carbonization temperature before the natural consumables furthest from the heat source are activated. Using both convection and conduction allows the vaporizer to maintain the contents at an optimal temperature during the user's inhalation, while also preserving flexibility when the air is actively circulated.

[0051] Additional features, such as controlled heating of the flower stick, and the use of a woven wire filter with characteristics of high surface area, high thermal mass, high thermal conductivity, and specific constituent surfaces of the woven wire filter itself, can be achieved.

[0052] The furnace temperature is controlled via signals collected by temperature sensors. Variable power is applied to the heater coil via a frequency-modulated signal ranging from 0 to 44 watts. Pulse-width modulation (PWM) is applied at 10,000 Hz or higher to avoid the buzzing sound caused by the rapid expansion and contraction of the coil. Based on the performance of the control circuit, the temperature deviation from the ideal temperature profile is estimated to be less than 20°C at any given time during a session.

[0053] The coil has a resistance of approximately 0.4 ohms, and the battery outputs a nominal voltage of 3.7-4.2V, providing a potential current of 10.5 amps and a maximum power of approximately 44 watts when applied to the furnace. In actual use, the power to the coil is pulse-width modulated (PWM) so that the power output to the coil at any given time during a heating session is proportional to the difference between the actual temperature measured by the sensor and the desired optimal temperature.

[0054] All publications and patent applications cited in this specification are incorporated herein by reference as if each individual publication or patent application were specifically and individually incorporated by reference.

[0055] While the present invention has been described with reference to exemplary embodiments, it will be understood by those skilled in the art that various modifications can be made without departing from the scope of the invention, and that equivalents can be substituted for its elements. Furthermore, many modifications can be made to adapt this teaching to specific situations or materials without departing from the essential scope of the invention. Accordingly, the present invention is not limited to the specific embodiments disclosed as the best mode for carrying out this invention, and the present invention is intended to include all embodiments that fall within the scope of the appended claims.

Claims

1. A dual conduction-convection heating furnace for use with a portable electronic heating device for delivering evaporated consumables in a flower stick, wherein the furnace is A heating coil that generates heat using electric current, A furnace tube adapted to transfer heat generated by the coil to the flower stick by conduction, One or more braided wire filters adapted to absorb the heat generated by the coil, A double conduction-convection heating furnace, including one.

2. The furnace according to claim 1, wherein the furnace tube is configured to exchange heat with the flower stick by conduction.

3. The furnace according to claim 1, wherein the one or more braided wire filters are configured to exchange heat with the air flowing through the filters.

4. The furnace according to claim 1, wherein the first braided wire filter comprises aluminum, brass, or copper wires.

5. The furnace according to claim 4, wherein the second braided wire filter comprises stainless steel wire.

6. The furnace according to claim 1, wherein one or more of the braided wire filters are compressed to form a cylindrical shape.

7. The furnace according to claim 1, wherein the one or more braided wire filters are configured to have notches or grooves adapted to fit one or more sensor and signal wires.

8. The furnace according to claim 1, wherein the one or more braided wire filters are adapted to exchange heat with the air flowing through the filters to a temperature higher than the temperature of the furnace tube in contact with the flower stick.

9. The furnace according to claim 1, further comprising one or more stick switches which are activated by inserting the flower stick into the heating furnace or removing the flower stick from the heating furnace.

10. The furnace according to claim 1, further comprising a furnace top gasket configured to form an airtight seal with the flower stick at a position above the open end of the furnace tube.

11. The furnace according to claim 1, further comprising one or more temperature sensors.

12. The furnace according to claim 11, wherein the first temperature sensor is positioned within a braided wire filter.

13. The furnace according to claim 12, wherein a second temperature sensor is attached to the furnace tube.

14. A dual conduction-convection heating furnace for use with a portable electronic heating device for delivering evaporated consumables in a flower stick, wherein the furnace is A heating coil that generates heat using electric current, A furnace tube adapted to transfer the heat generated by the coil to the flower stick via conduction, One or more braided wire filters adapted to absorb the heat generated by the coil, Stick guide and One or more air tubes, Base assembly and Includes, A dual conduction-convection heating furnace, through a pre-formed channel that passes over the stick guide, one or more air tubes, and base assembly before entering the heating coil.

15. The furnace according to claim 1, wherein the furnace tube further includes a smaller diameter segment adapted to absorb thermal energy from the heating coil, and a larger diameter segment adapted to receive the flower stick inserted into the furnace tube.

16. The furnace according to claim 1, wherein the braided wire filter is adapted to retain heat and regulate the temperature of the air flowing through the filter.

17. The furnace according to claim 14, wherein the one or more braided wire filters are configured to exchange heat with the air flowing through the filters.

18. The furnace according to claim 14, wherein the one or more braided wire filters are adapted to exchange heat with the air flowing through the filters to a temperature higher than the temperature of the furnace tube in contact with the flower stick.

19. The furnace according to claim 14, further comprising a furnace top gasket configured to form an airtight seal with the flower stick at a position above the open end of the furnace tube.

20. The furnace according to claim 14, wherein the furnace tube further comprises a smaller diameter segment adapted to absorb thermal energy from the heating coil and a larger diameter segment adapted to receive the flower stick inserted into the furnace tube.

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