Capsules containing embedded waveform heaters, heated-by-heat (HNB) aerosol generating devices, and methods for generating aerosols

Abstract

A capsule for an aerosol generating device includes an inner frame defining an opening, a corrugated heater supported by the inner frame and extending across at least a portion of the opening defined by the inner frame, and an aerosol generating material disposed at least partially within the opening and on each side of the corrugated heater.

Description

[Technical Field]

[0001] The present disclosure relates to capsules, heated-button (HNB) aerosol generating devices, and methods for generating aerosols without substantial thermal decomposition of the aerosol-forming material. [Background technology]

[0002] Some electronic devices are configured to heat plant material to a temperature sufficient to release its components while avoiding substantial thermal decomposition of the plant material by maintaining the temperature below the plant material's combustion point. Such devices may be referred to as aerosol-generating devices (e.g., heated aerosol-generating devices), and the heated plant material may be tobacco. In some examples, the plant material may be directly introduced into the heating chamber of the aerosol-generating device. In other examples, the plant material may be pre-packaged in individual containers to facilitate insertion into or removal from the aerosol-generating device. Summary of the Invention [Means for solving the problem]

[0003] At least one exemplary embodiment relates to a capsule for an aerosol generating device.

[0004] In at least one exemplary embodiment, a capsule for an aerosol generating device includes an inner frame defining an opening, and a waveform heater supported by the inner frame and extending across at least a portion of the opening.

[0005] In at least one exemplary embodiment, the capsule further includes an aerosol-generating material at least partially within the opening. The aerosol-generating material is on each side of the waveform heater. The aerosol-generating material includes plant material. The plant material includes tobacco.

[0006] In at least one exemplary embodiment, the inner frame includes a first surface, a second surface, a first end, a second end, a first side, and a second side. The first end defines at least one hole. The corrugated heater includes a first heater end and a second heater end. The first heater end and the second heater end extend through at least one hole in the first end of the inner frame. Each of the first heater end and the second heater end of the corrugated heater includes a tab portion.

[0007] In at least one exemplary embodiment, the waveform heater includes a first corrugation row and a second corrugation row, the first corrugation row being connected to the second corrugation row via a first connector, the first connector being U-shaped. The waveform heater further includes a third corrugation row connected to the second corrugation row via a second connector, the second connector being U-shaped.

[0008] In at least one exemplary embodiment, the inner frame has a thickness ranging from 1.0 mm to 6.0 mm. The thickness ranges from 2.0 mm to 4.0 mm. The corrugated heater includes at least one corrugation having peaks and valleys. The vertical distance between the peak of the peak and the bottom of the valley ranges from 0.5 mm to 3.0 mm.

[0009] In at least one exemplary embodiment, the capsule further includes an outer frame that surrounds at least a portion of the inner frame.

[0010] In at least one exemplary embodiment, the waveform heater has a triangular wave configuration.

[0011] At least one exemplary embodiment relates to an aerosol generating device.

[0012] In at least one exemplary embodiment, an aerosol generating device includes a device body configured to receive a capsule. The capsule includes an inner frame defining an opening, and a waveform heater supported by the inner frame and extending across at least a portion of the opening. The device further includes a plurality of electrodes within the device body configured to electrically contact the waveform heater of the capsule, and a power source configured to supply current to the waveform heater of the capsule via the plurality of electrodes.

[0013] In at least one exemplary embodiment, the device further includes an aerosol-generating material at least partially within the opening in the inner frame of the capsule and on each side of the corrugated heater. The aerosol-generating material includes plant material. The plant material includes tobacco.

[0014] In at least one exemplary embodiment, the inner frame includes a first surface, a second surface, a first end, a second end, a first side, and a second side. The first end defines at least one hole. The corrugated heater includes a first heater end and a second heater end. The first heater end and the second heater end extend through the at least one hole in the first end, and each of the first heater end and the second heater end of the corrugated heater includes a tab portion. The plurality of electrodes are configured to contact the tab portion of each of the first heater end and the second heater end of the corrugated heater.

[0015] In at least one exemplary embodiment, the waveform heater includes a first waveform row and a second waveform row. The first waveform row is connected to the second waveform row via a first connector. The first connector is U-shaped. In at least one exemplary embodiment, the waveform heater further includes a third waveform row connected to the second waveform row via a second connector. The second connector is U-shaped.

[0016] At least one exemplary embodiment relates to a method for generating an aerosol.

[0017] In at least one exemplary embodiment, a method of generating an aerosol includes electrically contacting a plurality of electrodes to a capsule including an inner frame and a waveform heater, the inner frame defining an opening and the waveform heater supported by the inner frame and extending across at least a portion of the opening, and supplying an electric current to the waveform heater of the capsule via the plurality of electrodes.

[0018] Various features and advantages of non-limiting embodiments of the present disclosure may become more apparent from a reading of the detailed description in conjunction with the accompanying drawings. The accompanying drawings are for illustrative purposes only and should not be understood to limit the scope of the claims. The accompanying drawings should not be considered to be drawn to scale unless explicitly stated. Various dimensions of the drawings may be exaggerated for clarity. [Brief explanation of the drawings]

[0019] [Figure 1A] FIG. 1A is a perspective view of a first side of a capsule for an aerosol generating device according to an exemplary embodiment.

[0020] [Figure 1B] FIG. 1B is a perspective view of a second side of a capsule for an aerosol generating device according to an exemplary embodiment.

[0021] [Figure 2A] FIG. 2A is an exploded view of the capsule of FIGS. 1A and 1B, according to at least one exemplary embodiment.

[0022] [Figure 2B] FIG. 2B is an exploded view of the capsule of FIGS. 1A and 1B, according to at least one exemplary embodiment.

[0023] [Figure 3] FIG. 3 is a perspective view of the capsule of FIGS. 1A and 1B with the first and second transmissive structures removed to reveal the heater, according to at least one example embodiment.

[0024] [Figure 4] FIG. 4 is a side cross-sectional view of the capsule of FIG. 3 according to at least one exemplary embodiment.

[0025] [Figure 5] FIG. 5 is a perspective view of a portion of a capsule for an aerosol generating device according to a second exemplary embodiment.

[0026] [Figure 6] FIG. 6 is a side cross-sectional view of a portion of the capsule of FIG. 5 taken along line VI-VI.

[0027] [Figure 7] FIG. 7 is a cross-sectional view of an aerosol generating device according to an exemplary embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0028] Several detailed exemplary embodiments are disclosed herein. However, the specific structural and functional details disclosed herein are provided merely to describe the exemplary embodiments. However, the exemplary embodiments may be embodied in many different forms and should not be construed as being limited to only the exemplary embodiments set forth herein.

[0029] Accordingly, the exemplary embodiments are susceptible to various modifications and variations, examples of which are shown in the drawings and described in detail herein. However, there is no intention to limit the exemplary embodiments to the particular forms disclosed, but rather the exemplary embodiments are intended to cover all modifications, equivalents, and alternatives. Like reference numerals refer to like elements throughout the description of the drawings.

[0030] When an element or layer is described as "on," "connected to," "coupled to," "attached to," "adjacent to," or "overlying" another element or layer, the element or layer may be directly on, connected to, coupled to, attached to, adjacent to, or overlying the other element or layer, or there may be intervening elements or layers. Conversely, when an element is described as "directly on," "directly connected to," or "directly coupled to" another element or layer, there are no intervening elements or layers. Like reference numerals refer to like elements throughout the specification. As used herein, the word "and / or" includes any and all combinations or subcombinations of one or more of the items listed with this word.

[0031] Although terms such as "first," "second," and "third" are used herein to describe various components, regions, layers, and / or portions, it should be understood that these components, regions, layers, and / or portions are not limited to these terms. These terms are used merely to distinguish one component, region, layer, or portion from another. Thus, a first component, region, layer, or portion described below may also be referred to as a second component, region, layer, or portion without departing from the teachings of the exemplary embodiments.

[0032] Spatial relative terms (e.g., "below," "below," "lower," "above," "above," etc.) are used herein for convenience to describe the illustrated relationship of one member or members or feature to another member or feature or features. It should be understood that spatial relative terms are intended to encompass various orientations of the device in use or operation in addition to the orientation shown in the figures. For example, if a device in the figures were turned over, a member described as being "below" or "below" another member or feature would now be "above" that other member or feature. Thus, the term "below" can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations), and the spatial relative terms used herein should be interpreted accordingly.

[0033] The terminology used herein is for the purpose of describing various exemplary embodiments only and is not intended to limit the exemplary embodiments. As used herein, the singular forms "a," "an," and "the" are intended to include the plural unless expressly specified otherwise. Furthermore, it should be understood that the words "comprise," "including," "comprises," and / or "comprising" specify the presence of stated features, integers, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, components, and / or groups thereof.

[0034] As used herein, when the terms "about" and "substantially" are used in connection with numerical values, the numerical values ​​to which these terms are used are intended to include a tolerance of ±10% of the stated numerical value, unless expressly specified otherwise. Furthermore, when the terms "generally" or "substantially" are used in connection with geometric shapes, precision of the geometric shape is not required, and shapes including tolerances are intended to be within the scope of the present disclosure. Furthermore, whether a numerical value or shape is modified by the terms "about," "generally," or "substantially," it should be understood that these numerical values ​​and shapes should be interpreted as including manufacturing or operational tolerances (e.g., ±10%) for the stated numerical value or shape.

[0035] Unless otherwise specified, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which the exemplary embodiments belong. Furthermore, these terms, including words defined in commonly used dictionaries, should be interpreted to have a meaning consistent with their meaning in the corresponding art, and should not be interpreted in an idealized or overly formal sense unless expressly specified otherwise herein.

[0036] The processing circuitry (control circuitry) may be hardware including logic circuitry, a hardware / software combination such as a processor executing software, or a combination thereof. More specifically, the processing circuitry may include, but is not limited to, a central processing unit (CPU), an arithmetic logic unit (ALU), a digital signal processor, a microcomputer, a field programmable gate array (FPGA), a system on a chip (SoC), a programmable logic unit, a microprocessor, an application specific integrated circuit (ASIC), etc.

[0037] 1A and 1B are perspective views of a first side and a second side of a capsule for an aerosol generating device according to an exemplary embodiment;

[0038] As shown in FIGS. 1A and 1B , in at least one exemplary embodiment, capsule 100 can be configured to be received within an aerosol generating device (e.g., a heated aerosol generating device). In the figures, capsule 100 has a layered structure and is generally planar in configuration. The proximal end of capsule 100 can have a curved proximal edge, and the opposite distal end can have a straight distal edge. Furthermore, a pair of straight side edges can connect the curved proximal end edge and the straight distal edge. The pair of straight side edges can be parallel to each other. Furthermore, the intersection of the straight side edge and the straight distal edge can be in the form of a rounded corner.

[0039] While the figures depict capsule 100 as resembling a rectangle with semicircular (e.g., elongated semicircular, semi-elliptical) ends, it should be understood that other configurations may be employed. For example, the shape may be circular, in which case capsule 100 has a disk-like appearance. In another example, capsule 100 may be oval or racetrack-like in shape. In another example, capsule 100 may be polygonal (regular or otherwise), including triangular, rectangular (including square), pentagonal, hexagonal, heptagonal, or octagonal. Capsule 100's layered structure and generally planar configuration may facilitate stacking, allowing multiple capsules to be stored within an aerosol generating device or other container that dispenses new or receives used capsules. In one exemplary embodiment, capsule 100 has a thickness of 1-4 mm (e.g., 1-2 mm).

[0040] Capsule 100 may include a housing 105 and a heater 170 within housing 105. Housing 105 of capsule 100 has an inner surface defining a chamber configured to hold aerosol-generating substance 160 (e.g., FIGS. 2A and 2B). Additionally, housing 105 of capsule 100 has an outer surface that defines a second surface opposite the first surface of capsule 100 and a side surface. The first and second surfaces of capsule 100 may be permeable to the aerosol. The side surface of capsule 100 is between the first and second surfaces. The side surface may be considered the periphery of capsule 100.

[0041] The housing of the capsule 100 includes a first frame 130 and a second frame 140. The first frame 130 and the second frame 140 may have the same shape and size (e.g., in a plan view) and may be aligned so that their outer sidewalls are substantially flush with each other, although exemplary embodiments are not limited thereto. The first frame 130 and the second frame 140 may be formed of a suitable polymer, such as polyetheretherketone (PEEK), liquid crystal polymer (LCP), and / or ultra-high molecular weight polyethylene (UHMWPE). The first frame 130 and the second frame 140 may be connected by a welded arrangement.

[0042] The first transmissive structure 110 is secured and exposed by a first frame 130. Similarly, the second transmissive structure 120 is secured and exposed by a second frame 140. As described in more detail herein, a third frame (or inner frame) 150 is disposed between the first transmissive structure 110 and the second transmissive structure 120 (and between the first frame 130 and the second frame 140). The capsule 100 is configured to hold an aerosol-generating substance 160 (shown in and described with reference to FIGS. 2A and 2B). The aerosol-generating substance 160 may be within the third frame 150 and between the first transmissive structure 110 and the second transmissive structure 120. The first recess 133 (e.g., a first depression) in the first frame 130 and the second recess 143 (e.g., a second depression) in the second frame 140 may be formed by an injection molding process. In this regard, the size, location, and / or shape of the first recess 133 and the second recess 143 may vary (or may not exist at all) depending on the manufacturing technique.

[0043] The first and second transmission structures 110 and 120 may be in the form of a mesh sheet, a perforated sheet, or a combination thereof. For example, both the first and second transmission structures 110 and 120 may be in the form of a mesh sheet. In another example, both the first and second transmission structures 110 and 120 may be in the form of a perforated sheet (e.g., 80, 100, or 250 mesh equivalent). The perforated sheet may be mechanically perforated or chemically perforated (e.g., photochemical machining / etching). In yet another example, one of the first and second transmission structures 110 and 120 may be in the form of a mesh sheet, and the other of the first and second transmission structures 110 and 120 may be in the form of a perforated sheet. The first transmission structure 110 and the second transmission structure 120 (and also the first frame 130 and the second frame 140) may have substantially the same size in plan view (e.g., ±10% of a given dimension).

[0044] As shown in FIG. 1A , the combination of the exposed surface of the first transmission structure 110 and the adjacent (e.g., substantially coplanar / parallel) surface of the first frame 130 may be considered a first surface of the capsule 100. Similarly, as shown in FIG. 1B , the combination of the exposed surface of the second transmission structure 120 and the adjacent (e.g., substantially coplanar / parallel) surface of the second frame 140 may be considered a second surface of the capsule 100. In at least one exemplary embodiment, the first surface, the second surface, or both may comprise a perforated sheet. In at least one exemplary embodiment, the first surface, the second surface, or both may comprise a mesh sheet. In yet another exemplary embodiment, either the first surface or the second surface may comprise a perforated sheet, and the other of the first surface or the second surface may comprise a mesh sheet.

[0045] As described above and in more detail herein, a heater 170 (e.g., FIGS. 2A and 2B ) may be disposed within capsule 100 to heat aerosol-generating material 160. Heater 170 may include, among other components, a first end 172 and a second end 176, which are configured to receive electrical current from a power source when heater 170 is activated. When heater 170 is activated, the temperature of aerosol-generating material 160 may increase, generating an aerosol that may be emitted through first transparent structure 110 and / or second transparent structure 120 of capsule 100.

[0046] 1A and 1B, the combination of the exposed surface of third frame 150 and the adjacent sidewalls of first frame 130 and second frame 140 may be considered a side of capsule 100. Additionally, first end 172 and second end 176 may be outer segments of heater 170, which also form part of the side of capsule 100. The outwardly facing surfaces of first end 172 and second end 176 of heater 170 may be coplanar, although example embodiments are not limited thereto.

[0047] As used herein, an aerosol-generating material is a material, or combination of materials, capable of producing an aerosol. An aerosol is a substance generated or produced by the devices disclosed and claimed herein and their equivalents. Such materials may include compounds (e.g., nicotine, cannabinoids) that, when heated, produce an aerosol containing the compounds. Heating may be below combustion temperatures, thereby producing the aerosol without substantial thermal decomposition of the aerosol-generating material or substantial generation of combustion by-products, if any. Thus, in certain exemplary embodiments, no thermal decomposition occurs during heating and the resulting production of the aerosol. In other instances, some thermal decomposition and combustion by-products may occur, but the extent may be relatively minor and / or may be considered merely incidental.

[0048] The aerosol-generating material can be a fibrous material. The fibrous material can be, for example, a plant material. The fibrous material is configured to release a compound when heated. The compound can be a natural component of the fibrous material. The fibrous material can be, for example, a plant material, such as tobacco, and the released compound can be nicotine. The term "tobacco" includes any tobacco plant material, including tobacco leaf, tobacco plugs, reconstituted tobacco, compressed tobacco, shaped tobacco, or powdered tobacco obtained from one or more species of tobacco plant, such as Nicotiana rustica and Nicotiana tabacum, and combinations thereof.

[0049] In some exemplary embodiments, the tobacco material may include material obtained from any member of the Nicotiana genus. Furthermore, the tobacco material may include a blend of two or more different tobacco species. Examples of suitable types of tobacco material that may be used include, but are not limited to, flue-cured tobacco, burley tobacco, dark tobacco, Maryland tobacco, Oriental tobacco, rare tobacco, specialty tobacco, blends thereof, and the like. The tobacco material may be provided in any suitable form, including, but not limited to, tobacco layers, processed tobacco materials (e.g., expanded or expanded tobacco), processed tobacco stems (e.g., cut rolled or cut expanded stems), reconstituted tobacco materials, blends thereof, and the like. In some exemplary embodiments, the tobacco material is in the form of a substantially dry tobacco mass. Furthermore, in some exemplary embodiments, the tobacco material may be mixed and / or combined with at least one of propylene glycol, glycerin, subcombinations thereof, or combinations thereof.

[0050] The compound may also be a natural component of a medicinal plant that has a medically acceptable therapeutic effect. For example, the medicinal plant may be the cannabis plant, and the compound may be a cannabinoid. Cannabinoids interact with receptors in the body to produce a wide range of effects. As a result, cannabinoids have been used for a variety of medical purposes (e.g., treating pain, nausea, epilepsy, and psychiatric disorders). The fibrous material may include leaf and / or flower material from one or more species of the cannabis plant (e.g., Cannabis sativa, Cannabis indica, and Cannabis ruderalis). In some examples, the fibrous material is a mixture containing 60-80% (e.g., 70%) Cannabis sativa and 20-40% (e.g., 30%) Cannabis indica.

[0051] Examples of cannabinoids include tetrahydrocannabinolic acid (THCA), tetrahydrocannabinol (THC), cannabidiol acid (CBDA), cannabidiol (CBD), cannabinol (CBN), cannabicyclol (CBL), cannabichromene (CBC), and cannabigerol (CBG). Tetrahydrocannabinolic acid (THCA) is a precursor of tetrahydrocannabinol (THC), and cannabidiol acid (CBDA) is a precursor of cannabidiol (CBD). Tetrahydrocannabinolic acid (THCA) and cannabidiol acid (CBDA) can be converted to tetrahydrocannabinol (THC) and cannabidiol (CBD), respectively, by heating. In certain exemplary embodiments, heat from a heater (e.g., heater 170 shown in Figures 2A and 2B) may cause decarboxylation, thereby converting tetrahydrocannabinolic acid (THCA) in capsule 100 to tetrahydrocannabinol (THC) and / or converting cannabidiolic acid (CBDA) in capsule 100 to cannabidiol (CBD).

[0052] In instances where tetrahydrocannabinolic acid (THCA) and tetrahydrocannabinol (THC) are both present in capsule 100, decarboxylation and the resulting conversion will decrease tetrahydrocannabinolic acid (THCA) and increase tetrahydrocannabinol (THC). During heating of capsule 100, at least 50% (e.g., at least 87%) of the tetrahydrocannabinolic acid (THCA) may be converted to tetrahydrocannabinol (THC). Similarly, in instances where cannabidiolic acid (CBDA) and cannabidiol (CBD) are both present in capsule 100, decarboxylation and the resulting conversion will decrease cannabidiolic acid (CBDA) and increase cannabidiol (CBD). During heating of capsule 100, at least 50% (e.g., at least 87%) of the cannabidiolic acid (CBDA) may be converted to cannabidiol (CBD).

[0053] Furthermore, the compound may be or may further include a non-natural additive, which is then introduced into the fibrous material. In one example, the fibrous material may include a synthetic material. In another example, the fibrous material may include a natural material, such as a cellulosic material (e.g., a non-tobacco material and / or a non-cannabis material). In either example, the introduced compound may include nicotine, a cannabinoid, and / or a flavoring agent. The flavoring agent may be from a natural source, such as a plant extract (e.g., tobacco extract, cannabis extract), and / or may be from an artificial source. In yet another example, when the fibrous material includes tobacco and / or cannabis, the compound may be or may further include one or more flavoring agents (e.g., menthol, mint, vanilla). Thus, the compound in the aerosol-generating material may include a natural component and / or a non-natural additive. In this regard, it should be understood that the level of a natural component present in the aerosol-generating material may be increased by supplementation. For example, the level of nicotine present in a quantity of tobacco may be increased by supplementing with a nicotine-containing extract. Similarly, the level of one or more cannabinoids present in a quantity of cannabis may be increased by supplementing it with a cannabinoid-containing extract.

[0054] FIG. 2A is an exploded view of the capsule of FIGS. 1A and 1B, according to at least one exemplary embodiment.

[0055] FIG. 2B is an exploded view of the capsule of FIGS. 1A and 1B, according to at least one exemplary embodiment.

[0056] 2A and 2B , the first frame 130 has a first inner surface and a first outer surface. The first frame 130 further defines a first opening 131. In an exemplary embodiment, sidewalls of the first opening 131 have opposing straight portions and, optionally, opposing curved portions. One curved portion may be adjacent to a proximal end of the first frame 130, and the other curved portion may be adjacent to the opposite distal end of the first frame 130. The first transmission structure 110 may be fixed to the first inner surface of the first frame 130 and exposed by the first opening 131. From a different perspective, the first transmission structure 110 may also be considered to cover the first opening 131. The first transmission structure 110 may further define a first aperture 112. The first aperture 112 may have a position and size that can accommodate a first protrusion (not shown), which corresponds to the first recess 133 shown in FIG. 2A when the first transmissive structure 110 is fixed to the first frame 130.

[0057] The second frame 140 has a second inner surface and a second outer surface. The second frame 140 further defines a second opening 141. In an exemplary embodiment, side walls of the second opening 141 have opposing straight portions and, optionally, opposing curved portions. One curved portion may be adjacent to a proximal end of the second frame 140, and the other curved portion may be adjacent to the opposite distal end of the second frame 140. The second transmission structure 120 may be fixed to the second inner surface of the second frame 140 and exposed by the second opening 141. From a different perspective, the second transmission structure 120 may also be considered to cover the second opening 141. The size and shape of the second opening 141 may correspond to (or be a mirror image of) the size and shape of the first opening 131. Furthermore, the second transmission structure 120 may define a second aperture 122. The second aperture 122 may have a position and size that can accommodate the second protrusion 145 when the second transmission structure 120 is fixed to the second frame 140.

[0058] The third frame 150 defines a cavity 151 configured to receive the aerosol-generating material 160. The combination of the sidewalls of the cavity 151 and the inner surfaces of the first and second transparent structures 110, 120 (which cover the cavity 151) can be considered to define a chamber. In an exemplary embodiment, the sidewalls of the cavity 151 have opposing straight portions and opposing curved portions. One curved portion is adjacent to the proximal end of the third frame 150, and the other curved portion is adjacent to the opposite distal end of the third frame 150. The third frame 150 can have substantially the same size as the first and second transparent structures 110, 120 in a plan view (e.g., ±10% of a given dimension). The third frame 150 further defines at least one aperture 152 adjacent to an end of the third frame 150. The third frame 150 may be formed from other suitable materials, such as ceramic, synthetic glass, and / or consolidated fiber (e.g., cardboard), in addition to the materials forming the first frame 130 and the second frame 140.

[0059] In at least one exemplary embodiment, heater 170 is configured to extend through third frame 150 into cavity 151. Heater 170 may also be considered to be supported by third frame 150. Heater 170 includes a first end 172, an intermediate portion 174, and a second end 176, which will be further described with reference to FIGS. 3 and 4. First end 172 and second end 176 of heater 170 are also outer segments that form part of the side of capsule 100. Intermediate portion 174 of heater 170 is an inner segment that is disposed within capsule 100 (within the chamber of the housing that contains aerosol-generating material 160). First end 172, intermediate portion 174, and second end 176 of heater 170 are each part of a continuous structure. In an exemplary embodiment, intermediate portion 174 of heater 170 has a planar configuration that includes a plurality of U-shaped corrugations.

[0060] Aerosol-generating material 160 may be disposed within cavity 151 of third frame 150 on one side of intermediate portion 174 of heater 170 (as shown in FIG. 2A ) or on both sides (as shown in FIG. 2B ). In at least one exemplary embodiment, aerosol-generating material 160 may be in a reinforced form (e.g., a sheet, pallet, tablet) configured to maintain its shape, thereby allowing aerosol-generating material 160 to be placed in cavity 151 of third frame 150 in a uniform manner. In such an example, a single mass of aerosol-generating material 160 may be disposed on one side of intermediate portion 174 of heater 170, as shown in FIG. 2A . 2B , one mass of aerosol-generating material 160 may be disposed on one side of intermediate portion 174 of heater 170 and another mass of aerosol-generating material 160 may be disposed on the other side of intermediate portion 174 of heater 170 (e.g., so that aerosol-generating material 160 substantially fills cavity 151 of third frame 150 and sandwiches / embeds intermediate portion 174 of heater 170 between aerosol-generating material 160). Alternatively, aerosol-generating material 160 may be in a loose form (e.g., particles, fibers, powder, flakes, or debris) that does not have a set shape and is configured to take the shape of cavity 151 of third frame 150 when introduced.

[0061] The first and second transparent structures 110 and 120 may be secured to the first and second frames 130 and 140, respectively, by various attachment techniques. Attachment techniques may include, for example, injection molding (e.g., insert molding, overmolding). In another example, attachment techniques may include ultrasonic welding. In another example, attachment techniques may include adhesives (e.g., tape, glue) deemed food-safe or acceptable by regulatory agencies. Alternatively, the first and second transparent structures 110 and 120 may be clamped (or otherwise fastened) to the third frame 150 by the first and second frames 130 and 140, respectively, instead of using separate attachment techniques.

[0062] As shown in FIG. 2A , the first frame 130 includes at least one connector protruding from the first inner surface of the first frame 130. The at least one connector of the first frame 130 may be in the form of a first connector 138. In an exemplary embodiment, the first connector 138 may be in the form of a ridge (e.g., a first ridge) extending along the edge of the first inner surface of the first frame 130. The ridge may define a groove extending its entire length, resembling a raised groove or a recessed / concave ridge. Additionally or alternatively, the ridge may have a tapered edge and may thus be referred to as a tapered ridge. While the first connector 138 is shown as being separated into multiple discrete structures (e.g., four discrete structures), it should be understood that exemplary embodiments are not limited in this respect. Alternatively, for example, the first connector 138 may be a single continuous structure extending along the edge, completely surrounding the first inner surface of the first frame 130.

[0063] Similarly, the second frame 140 includes at least one second connector protruding from the second inner surface of the second frame 140. The at least one connector of the second frame 140 may be in the form of a second connector 148. The second connector 148 of the second frame 140 and the first connector 138 of the first frame 130 are complementary structures configured to mate with each other. In an exemplary embodiment, the second connector 148 may extend along the edge of the second inner surface of the second frame 140 in the form of a ridge (e.g., a second ridge). The ridge may define a groove extending its entire length, resembling a raised groove or a recessed / concave ridge. Additionally or alternatively, the ridge may have a tapered edge and may thus be referred to as a tapered ridge. While the second connector 148 is shown as being separated into multiple discrete structures (e.g., four discrete structures), it should be understood that exemplary embodiments are not limited in this respect. Alternatively, for example, the second connector 148 may be a single continuous structure that extends along the periphery and completely surrounds the second interior surface of the second frame 140 .

[0064] In a non-limiting embodiment of the present disclosure shown in FIG. 2A , the first connector 138 of the first frame 130 is separated into four discrete structures. Two of the structures may be raised grooves and two of the structures may be tapered ridges. Conversely, the second connector 148 of the second frame 140 may be separated into four discrete structures, two of which are tapered ridges and two of which are raised grooves. The mixed set of raised grooves and tapered ridges on the first frame 130 is configured to pair with the mixed set of tapered ridges and raised grooves on the second frame 140 during assembly of the capsule 100. It should be understood that various combinations of raised grooves and tapered ridges on the first frame 130 and the second frame 140 are possible. Further, each of the first transparent structure 110 and the second transparent structure 120 may have tab-like extensions (e.g., four tab-like extensions) that are positioned between the discrete structures of the first connector 138 and the second connector 148, respectively, when the capsule 100 is assembled.

[0065] The tapered ridges of the first connector 138 and / or the second connector 148 may have shoulders and sloped portions rising from the shoulders to form tapered ridges. The tapered ridges may function as energy directors (e.g., to facilitate welding) during assembly. The corresponding raised grooves of the first connector 138 and / or the second connector 148 may have edges and groove bottoms. As shown in FIG. 2A , the groove bottoms of the raised grooves may be flat. Alternatively, the groove bottoms of the raised grooves may be V-shaped. In an exemplary embodiment for connecting the first frame 130 and the second frame 140, the sloped portions of the tapered ridges are configured to contact the groove bottoms of the corresponding raised grooves, and the shoulders of the tapered ridges interact with the edges of the raised grooves. Therefore, the mating surfaces of the first connector 138 and the second connector 148 may be configured inversely or complementary to each other to facilitate mating.

[0066] As shown in FIG. 2A , when a mixed set of raised grooves and tapered ridges for each frame is grouped such that the raised grooves are on one straight side edge and the tapered ridges are on the other straight side edge, the first frame 130 and the second frame 140 can be the same part. In such an example, the first frame 130 and the second frame 140 are paired opposite each other to form complementary structures. As a result, one part can be used interchangeably as the first frame 130 or the second frame 140, thereby simplifying the manufacturing process.

[0067] To assemble the capsule 100, the aerosol-generating material 160 may be disposed in the cavity 151 of the third frame 150 (e.g., so that the aerosol-generating material 160 is present on both sides of the middle portion 174 of the heater 170) and then the first frame 130 may be connected to the second frame 140. In this example, when the first frame 130 is connected to the second frame 140, the third frame 150 is sandwiched between the first and second transparent structures 110 and 120. At least one connector of the first frame 130 is configured to mate with at least one connector of the second frame 140 to form at least one connection (e.g., four connections) during assembly. For example, the raised groove (and / or tapered ridge) of the first connector 138 is configured to mate with a corresponding tapered ridge (and / or raised groove) of the second connector 148. Additionally, the coupling between the first connector 138 of the first frame 130 and the second connector 148 of the second frame 140 may be achieved by a welded structure (e.g., ultrasonic welding). Furthermore, when the capsule 100 is assembled, the outer sidewall of the first frame 130 may be substantially flush with the outer sidewall of the second frame 140, although the exemplary embodiment is not limited thereto. Once assembled, the capsule 100 is difficult or impractical to open without damaging the connector, the frame, and / or other aspects of the capsule 100. As a result, the capsule 100 is tamper-resistant against unauthorized actions by third parties.

[0068] The capsule 100 has been described as having, among other components, a first frame 130 that is separate from the second frame 140. Alternatively, in some examples, the first frame 130 and the second frame 140 may be manufactured as a single structure. This single structure is configured to be folded during assembly so that the first connector 138 engages the second connector 148. The first frame 130 and the second frame 140 may resemble, for example, a bivalve shell structure, where a straight distal end of the first frame 130 is connected to a straight distal end of the second frame 140, with the integral thinned portion serving as a fold. In another example, a straight side edge of the first frame 130 may be connected to a straight side edge of the second frame 140, with the integral thinned portion serving as a fold. It should be understood that a bivalve shell structure may omit one or more connections (e.g., along a fold) from the capsule 100.

[0069] Figure 3 is a perspective view of the capsule of Figures 1A and 1B with the first and second transmissive structures removed to reveal the heater, according to at least one exemplary embodiment. Figure 4 is a side cross-sectional view of the capsule of Figure 3, according to at least one exemplary embodiment.

[0070] In at least one exemplary embodiment, as shown in FIGS. 3 and 4 , a heater 170 is provided within a cavity (or opening) 151 defined by a third frame 150. The heater 170 includes a first end 172, a middle portion 174, and a second end 176. The first end 172 and the second end 176 extend through apertures 152 in the ends of the third frame 150 to the exterior of the housing of the capsule 100 (e.g., to facilitate electrical connection to a power source). The first end 172 and the second end 176 include tab portions 178 a and 178 b, respectively, which are connectable to a battery or other power source via electrical leads (not shown). The tab portions 178 a and 178 b may be rounded or otherwise shaped and are of sufficient size to easily connect to a battery or other power source. The first end 172 and the second end 176 of the heater 170 may be coplanar, although example embodiments are not limited thereto. The first end 172 and the second end 176 of the heater 170 may further define an aperture.

[0071] In at least one exemplary embodiment, the intermediate portion 174 of the heater 170 includes at least one corrugation portion that extends across at least a portion of the opening defined by the third frame 150 and is disposed between the first end 172 and the second end 176. As shown in FIG. 4 , the at least one corrugation portion may be in the form of a triangular wave in a side view. In other exemplary embodiments, the at least one corrugation portion may be in the form of a sine wave, a sawtooth wave, a square wave, or any other wave shape having valleys V and adjacent crests P. The at least one corrugation portion may include 1 to 40 (e.g., 2 to 35, 5 to 30, 10 to 25, or 15 to 20) crests P and valleys V. The vertical distance VD between adjacent peaks P and valleys V of the corrugations can be from about 0.25 mm to about 1.5 mm (eg, from about 0.50 mm to about 1.25 mm, or from about 0.75 mm to about 1.00 mm).

[0072] 3 and 4, the middle portion 174 of the heater 170 further includes multiple rows of corrugations, each row being a corrugation. The multiple rows of corrugations may be connected to adjacent rows at their ends by connectors 300. For example, as shown in FIG. 3, a first row of corrugations is connected to a second row of corrugations by a U-shaped connector 300. A third row of corrugations is connected to the second row of corrugations by a second U-shaped connector. In at least one exemplary embodiment, the heater 170 may include between 1 and 20 rows of corrugations, each row connected to one or more adjacent rows by connectors, such as U-shaped connectors.

[0073] In at least one exemplary embodiment, as shown in FIG. 4 , the third frame 150 can have a thickness of about 0.5 mm to about 5 mm (e.g., about 1.0 mm to about 4 mm, about 1.5 mm to about 3.5 mm, or about 1.0 mm to about 3.0 mm). For example, the third frame 150 can have a thickness of about 2 mm, and the vertical distance VD between the peaks P and the valleys V can be about 1 mm. The heater 170 can be located in the center of the thickness of the third frame 150, allowing aerosol-generating material to be provided on both sides of the heater 170. At least a portion of the corrugations extend into the aerosol-generating material, thereby increasing the contact area between the aerosol-generating material and the heater 170.

[0074] When the heater 170 is activated, the temperature of the aerosol-generating material may increase, generating an aerosol that may be emitted through the first transmissive structure 110 and / or the second transmissive structure of the capsule 100 .

[0075] In at least one exemplary embodiment, the heater 170 may be formed from a sheet of material that may be corrugated by cutting, photoetching, or punching, or may be otherwise processed (e.g., electrochemically etched, die cut, laser cut).

[0076] In an exemplary embodiment, the heater 170 is configured to undergo Joule heating (also known as ohmic heating / resistive heating) when an electric current is applied. More specifically, the heater 170 may be formed of one or more conductors and configured to generate heat when an electric current is passed through it. The electric current may be supplied to the first end 172 and the second end 176 of the heater 170 from a power source (e.g., a battery) within the aerosol generating device. Suitable conductors for the heater 170 include iron-based alloys (e.g., steel, iron aluminide), nickel-based alloys (e.g., nichrome), and / or ceramics (e.g., iron-coated ceramic). The middle portion 174 of the heater 170 may have a thickness of approximately 0.1-0.3 mm (e.g., 0.15-0.25 mm) and a resistance of approximately 0.5-2.5 ohms (e.g., 1-2 ohms) before being corrugated.

[0077] Electrical current from a power source within the aerosol generating device can be passed through the electrodes when the capsule 100 is inserted into the aerosol generating device. The electrodes are configured to electrically contact the first end 172 and the second end 176 of the heater 170. In a non-limiting embodiment of the present disclosure, the electrodes within the aerosol generating device can be spring-loaded to facilitate engagement of the capsule 100 with the heater 170. For example, the spring-loaded first electrode within the aerosol generating device can have a rounded or chamfered engagement portion configured to be in electrical contact with the first end 172 of the heater 170 and disposed within an aperture within the first end 172. Similarly, the spring-loaded second electrode within the aerosol generating device can have a rounded or chamfered engagement portion configured to be in electrical contact with the second end 176 of the heater 170 and disposed within an aperture within the second end 176. In such an example, engagement of the first and second electrodes of the aerosol generating device with the first end 172 and second end 176 of the heater 170, respectively, may be confirmed by an audible click. The spring suspension of the electrodes may be perpendicular to the plane of the heater 170. Activation (e.g., engagement and disengagement) of the electrodes may be achieved by mechanical actuation in addition to or instead of spring suspension. Furthermore, the supply of electrical current from the aerosol generating device to the capsule 100 may be manual (e.g., button-activated) or automatic (e.g., puff-activated).

[0078] Fig. 5 is a perspective view of a capsule for an aerosol generating device according to a second exemplary embodiment, and Fig. 6 is a side cross-sectional view of the capsule of Fig. 5 taken along line VI-VI.

[0079] 5 and 6, capsule 100 is the same as that shown in FIGS. 1A-4, with the following exceptions: frame 150 is shown without an outer housing, third frame 150 is thicker, and heater 170 has fewer corrugations. In at least one exemplary embodiment, heater 170 has fewer peaks and valleys, as shown, and the vertical distance VD between peaks P and valleys V is longer. Heater 170 may include, for example, two to three peaks and two to three valleys, and the vertical distance VD between peaks P and valleys V may be about 2.0 mm to about 3.0 mm or about 2.5 mm. The thickness of third frame 150 may be about 3.5 mm to about 4.0 mm or about 3.5 mm. Because frame 150 is thicker and the corrugations are larger, a greater amount of aerosol-generating material may be contained within the capsule.

[0080] Referring to FIG. 7 , an aerosol generating device 1000 (e.g., a heated aerosol generating device) includes a mouthpiece 1015 having an outlet 1017 and a device body 1025. A power source 1035 and control circuitry 1045 may be disposed within the device body 1025 of the aerosol generating device 1000. The power source 1035 may include one or more batteries (e.g., a rechargeable dual battery configuration), such as a lithium-ion battery. The aerosol generating device 1000 is configured to receive a capsule 700, which may be any of those described in connection with any of the embodiments herein. The aerosol generating device 1000 further includes an engagement assembly 1055 configured to electrically contact the capsule 700. In an exemplary embodiment, the engagement assembly 1055 includes a first electrode 1060 and a second electrode 1062, which are configured to electrically contact the first end 172 and the second end 176 of the heater of the capsule 700, respectively.

[0081] After the capsule 700 is inserted into the aerosol generating device 1000, the control circuit 1045 can instruct the power source 1035 to supply current between the first electrode and the second electrode of the engagement assembly 1055. The supply of current from the power source 1035 can be in response to manual operation (e.g., button activation) or automatic operation (e.g., puff-activated). As a result of the current supply, the capsule 700 can be heated and generate aerosol. Furthermore, changes in the heater resistance can be used to monitor and control the aerosolization temperature. The generated aerosol can be inhaled from the aerosol generating device 1000 through the mouthpiece 1015.

[0082] In at least one exemplary embodiment, activation of the aerosol generating device 1000 may heat the capsule 700 within the device body 1025, generating an aerosol. In at least one exemplary embodiment, activation of the aerosol generating device 1000 may be achieved by detection of airflow by the sensor 1075 and / or generation of a signal in response to pressing the first button 1080 and / or the second button 1085. For airflow detection, ambient air is drawn into the device body 1025 via the air inlet 1065 by applying suction or negative pressure to the aerosol outlet 1017 of the mouthpiece 1015. Once inside the device body 1025, the air flows through the inlet channel 1095 and is detected by the sensor 1075. A portion of the air further enters the capsule 700, as described herein.

[0083] When airflow is detected by the sensor 1075, the control circuit 1045 directs the power supply 1035 to supply current to the capsule 700 via the first end 172 and the second end 176 of the heater (as described above). As a result, the temperature of the middle portion 174 of the heater increases, which in turn increases the temperature of the aerosol-generating substance (e.g., the aerosol-generating substance 160), causing the aerosol-generating substance 160 to release volatiles and generate an aerosol. The generated aerosol is entrained by the air flowing through the capsule 700. In particular, after passing through the capsule 700, the generated aerosol exits the aerosol-generating device 1000 through the aerosol outlet 1017 of the mouthpiece 1015.

[0084] The processing circuitry (control circuitry) may be hardware including logic circuitry, a hardware / software combination such as a processor executing software, or a combination thereof. More specifically, the processing circuitry may include, but is not limited to, a central processing unit (CPU), an arithmetic logic unit (ALU), a digital signal processor, a microcomputer, a field programmable gate array (FPGA), a system on a chip (SoC), a programmable logic unit, a microprocessor, an application specific integrated circuit (ASIC), etc.

[0085] Further details of the capsule 700 and the aerosol generating device 1000, including the mouthpiece 1015, device body 1025, power source 1035, control circuitry 1045, and electrodes, can be found in U.S. patent application Ser. No. 15 / 845,501, filed Dec. 18, 2017, entitled "VAPORIZING DEVICES AND METHODS FOR DELIVERING A COMPOUND USING THE SAME" (Attorney Docket No. 24000DM-000012-US), the disclosure of which is incorporated herein by reference in its entirety. The capsules, aerosol-generating materials, and related aspects described herein are further described in more detail in U.S. patent application Ser. No. 16 / 252,951, filed Jan. 21, 2019, entitled "CASULE, HEAT-NOT-BURN (HNB) AEROSOL-GENERATING DEVICES, AND METHODS OF GENERATING AN AEROSOL" (Attorney Docket No. 24000NV-000521-US), the entire disclosure of which is incorporated herein by reference.

[0086] Further details of the materials, capsules, devices, and methods described herein can be found in U.S. patent application Ser. No. 16 / 451,662, filed June 25, 2019, entitled "CASULES, HEAT-NOT-BURN (HNB) AEROSOL-GENERATING DEVICES, AND METHODS OF GENERATING AN AEROSOL" (Attorney Docket No. 24000NV-000522-US), and U.S. patent application Ser. No. 16 / 252,951, filed January 21, 2019, entitled "CASULES, HEAT-NOT-BURN (HNB) AEROSOL-GENERATING DEVICES, AND METHODS OF GENERATING AN AEROSOL" (Attorney Docket No. 24000NV-000522-US). U.S. patent application Ser. No. 15 / 845,501, filed December 18, 2017, entitled "VAPORIZING DEVICES AND METHODS FOR DELIVERING A COMPOUND USING THE SAME" (Attorney Docket No. 24000DM-000012-US); U.S. patent application Ser. No. 15 / 559,308, filed September 18, 2017, entitled "VAPORIZER FOR VAPORIZING AN ACTIVE AEROSOL" (Attorney Docket No. 24000NV-000521-US); U.S. patent application Ser. No. 15 / 845,501, filed December 18, 2017, entitled "VAPORIZING DEVICES AND METHODS FOR DELIVERING A COMPOUND USING THE SAME" (Attorney Docket No. 24000DM-000012-US); and U.S. patent application Ser. No. 15 / 559,308, filed September 18, 2017, entitled "VAPORIZER FOR VAPORIZING AN ACTIVE AEROSOL" (Attorney Docket No. 24000DM-000012-US). The present invention may also be found in U.S. Patent Application No. 16 / 909,131, filed June 23, 2020, entitled "CASULES INCLUDING INTERNAL HEATERS, HEAT-NOT-BURN (HNB) AEROSOL-GENERATING DEVICES, AND METHODS OF GENERATING AN AEROSOL" (Attorney Docket No. 24000NV-000603-US), and U.S. Patent Application No. 16 / 909,131, filed June 23, 2020, entitled "CASULES INCLUDING INTERNAL HEATERS, HEAT-NOT-BURN (HNB) AEROSOL-GENERATING DEVICES, AND METHODS OF GENERATING AN AEROSOL" (Attorney Docket No. 24000NV-000603-US).The entire disclosure of the above application is incorporated herein by reference.

[0087] While a number of exemplary embodiments have been described herein, it should be understood that other variations are possible. Such variations should not be considered a departure from the spirit and scope of the present disclosure, and it is intended that all modifications obvious to those skilled in the art be included within the scope of the following claims.

Claims

1. 1. A capsule for an aerosol generating device, comprising: an inner frame that defines an opening; a wave heater supported by the inner frame and extending across at least a portion of the opening; Including, The inner frame is a first surface; and a second surface; and a first end; a second end; and A first aspect; The second aspect; Including, The wave heater comprises: a first heater surface; a second heater surface; and a first heater end; a second heater end; a first heater side; a second heater side; and Including, the first heater surface and the second heater surface extend parallel to the first surface and the second surface of the inner frame; The wave heater comprises: a first waveform row; the second waveform row and Including, The first corrugated row is connected to the second corrugated row via a first connection, and the first heater surface and the second heater surface of the corrugated heater are not flat.

2. The capsule of claim 1 , further comprising an aerosol-generating material at least partially within the opening and on each side of the waveform heater.

3. The capsule of claim 2 , wherein the aerosol-forming material comprises plant material.

4. 4. The capsule of claim 3, wherein the plant material comprises tobacco.

5. the first end defining at least one aperture; 2. The capsule of claim 1, wherein the waveform heater includes a first heater end and a second heater end, the first heater end and the second heater end extending through the at least one hole in the first end of the inner frame.

6. The capsule of claim 5 , wherein the first heater end and the second heater end of the waveform heater each include a tab portion.

7. The capsule of claim 1 , wherein the first connection is U-shaped.

8. 8. The capsule of claim 7, wherein the waveform heater further includes a third corrugation row connected to the second corrugation row via a second connector, the second connector being U-shaped.

9. 10. The capsule of claim 1, wherein the inner frame has a thickness in the range of 1.0 mm to 6.0 mm.

10. 10. The capsule of claim 9, wherein the thickness is in the range of 2.0 mm to 4.0 mm.

11. 2. The capsule of claim 1, wherein the corrugated heater includes at least one corrugation having a peak and a valley, and the vertical distance between the peak of the peak and the bottom of the valley is in the range of 0.5 mm to 3.0 mm.

12. The capsule of claim 1 , further comprising an outer frame surrounding at least a portion of the inner frame.

13. The capsule of claim 1 , wherein the waveform heater has a triangular wave configuration.

14. 1. An aerosol generating device comprising: A device body configured to receive a capsule, the capsule comprising: an inner frame that defines an opening; a wave heater supported by the inner frame and extending across at least a portion of the opening; a device body including: a plurality of electrodes within the device body configured to electrically contact the waveform heater of the capsule; a power source configured to supply current to the waveform heater of the capsule via the plurality of electrodes; Including, The inner frame is a first surface; and a second surface; and a first end; a second end; and A first aspect; The second aspect; Including, The wave heater comprises: a first heater surface; a second heater surface; and a first heater end; a second heater end; a first heater side; a second heater side; and Including, an aerosol generating device, wherein the first heater surface and the second heater surface extend parallel to the first surface and the second surface of the inner frame, and the first heater surface and the second heater surface of the corrugated heater are not flat.

15. 15. The aerosol generating device of claim 14, further comprising an aerosol generating material at least partially within the opening in the inner frame of the capsule and on each side of the wave heater.

16. 16. The aerosol generating device of claim 15, wherein the aerosol-forming substance comprises plant material.

17. 17. The aerosol generating device of claim 16, wherein the plant material comprises tobacco.

18. the first end defining at least one aperture; the waveform heater includes a first heater end and a second heater end, the first heater end and the second heater end extending through the at least one hole in the first end, and the first heater end and the second heater end of the waveform heater each including a tab portion; 15. The aerosol generating device of claim 14, wherein the plurality of electrodes are configured to contact the tab portion of each of the first heater end and the second heater end of the corrugated heater.

19. 15. The aerosol generating device of claim 14, wherein the waveform heater includes a first waveform row and a second waveform row, the first waveform row being connected to the second waveform row via a first connecting portion, and the first connecting portion being U-shaped.

20. 20. The aerosol generating device of claim 19, wherein the waveform heater further includes a third waveform row connected to the second waveform row via a second connection, the second connection being U-shaped.

21. 1. A method for generating an aerosol, comprising: placing a plurality of electrodes in electrical contact with a capsule including an inner frame and a wave heater, the inner frame defining an opening; supplying current to the waveform heater of the capsule via the plurality of electrodes; Including, the inner frame includes a first surface, a second surface, a first end, a second end, a first side, and a second side; the corrugated heater is supported by the inner frame and extends across at least a portion of the opening; the corrugated heater includes a first heater surface, a second heater surface, a first heater end, a second heater end, a first heater side, and a second heater side; the first heater surface and the second heater surface extend parallel to the first surface and the second surface of the inner frame; and the first heater surface and the second heater surface of the corrugated heater are not flat.

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