Silica gel cooling unit for heated products

Abstract

This is a silica gel cooling element (1) for a heated tobacco product. The silica gel cooling element (1) is a cylindrical cooling element consisting of a linear-hole smoke channel (2) with various cross-sectional shapes and a channel wall surrounding the smoke channel (2). It can be directly integrated with a smoke generating element (3) and other components into a cigarette with a two-component or more-component structure. The silica gel cooling element (1) has high air permeability, high specific heat capacity, and good heat resistance. The smoke temperature is reduced by dual cooling, due to the heat absorption by the evaporation of bound water in the silica gel and the specific heat capacity of the silica gel. Furthermore, since there is no thermal breakdown or melting during smoking, the smoke concentration increases while the smoke temperature decreases. The addition of aromatic substances contributes to a rich tobacco flavor, resulting in a satisfying consumer experience.

Description

[Technical Field]

[0001] This application claims priority from Chinese Patent Application No. 2020112823931, filed on November 16, 2020.

[0002] The present invention relates to the technical field of tobacco processing, and more particularly to a silica gel cooling section for heat-not-burn products. [Background technology]

[0003] It is well known that smoking is harmful to health. With the development of society and the continuous improvement of people's living standards, people are increasingly concerned about their own physical health. Therefore, how to smoke safely is an important direction for the development of tobacco technology. Heated tobacco products are not burned, but are heated by electronic devices at temperatures between 300 and 500°C. Heated tobacco products are environmentally friendly because they do not produce open flames or tobacco ash. They also allow consumers to enjoy the aroma of tobacco while smoking using electronic heating devices, reducing the harmful substances generated by high-temperature pyrolysis during the combustion of traditional cigarettes. They offer an effective method for healthy smoking. This smoking method has become increasingly popular both at home and abroad, and a considerable number of consumer groups have formed.

[0004] When using a heated product, if the smoking set is heated and the tobacco structure is short, heat is generated rapidly during the smoking process, affecting the smoking experience. For example, U.S. Patent Application Publication No. 20140305448 discloses a heated cartridge with a four-element composite structure, which includes a cooling section formed by shrinking, gathering, and polymerizing a polylactic acid film. During the smoking process, the polylactic acid absorbs some of the smoke's heat through its phase change mechanism, lowering the temperature of the inhaled smoke and thereby improving the smoking experience. However, the phase change process involves not only physical changes but also chemical changes. After the polylactic acid is melted at high temperatures, the polylactic acid film shrinks and melts, blocking the smoke flow path and affecting the smoking flavor.

[0005] Therefore, the inventors have conducted numerous tests and analyses on the silica gel cooling section in heated tobacco products in relation to the technical shortcomings of the prior art, and have completed the present invention. Summary of the Invention

[0006] SUMMARY OF THE INVENTION It is an object of the present invention to provide a silica gel cooling section for heated products.

[0007] The present invention is achieved by the following technical solutions.

[0008] The present invention relates to a silica gel cooling section for heated products.

[0009] The silica gel cooling section of the heated product is a cylindrical cooling section consisting of a straight-hole smoke flow path having various cross-sectional shapes such as a circle, a triangle, a pentagon, a quincunx, or other irregular shapes, and a flow path wall surrounding the smoke flow path, and the water content of the silica gel in the silica gel cooling section is 1.0 to 3.0% by weight.

[0010] According to a preferred embodiment of the present invention, the silica gel cooling section is produced by using an existing high-temperature curing molding method to produce a prefabricated silica gel cooling section from silica gel, and the prefabricated silica gel cooling section is maintained at a temperature of 18 to 22°C and a relative humidity of 68 to 72% for more than 24 hours, and the silica gel cooling section is obtained when the water content of the prefabricated silica gel cooling section reaches 1.0 to 3.0% by weight.

[0011] According to another preferred embodiment of the present invention, the high temperature curing molding method is extrusion molding, film press molding, injection molding or adhesive drop molding.

[0012] According to another preferred embodiment of the present invention, the silica gel of the silica gel cooling unit is a food-grade silicone rubber material such as methyl silicone rubber, methyl vinyl silicone rubber, methyl vinyl phenyl silicone rubber, nitrile silicone rubber, or fluorosilicone rubber.

[0013] According to another preferred embodiment of the present invention, the silica gel of the silica gel cooling unit has a specific heat capacity of 1.9 to 3.1 kJ / (kg·°C).

[0014] According to another preferred embodiment of the present invention, the thermal decomposition temperature of the silica gel in the silica gel cooling section is 300°C or higher.

[0015] According to another preferred embodiment of the present invention, the ratio of the cross-sectional area of ​​the smoke passage to the cross-sectional area of ​​the non-passage of the silica gel cooling part is 0.3 to 2.0.

[0016] According to another preferred embodiment of the present invention, the silica gel cooling portion has a length of 5 to 50 mm, an outer diameter of 4.0 to 8.0 mm, and a Shore hardness of 20 to 80 degrees.

[0017] According to another preferred embodiment of the present invention, the silica gel of the silica gel cooling section contains floral, mint, fruit or tobacco flavoring.

[0018] According to another preferred embodiment of the present invention, the silica gel cooling section and the smoking section are combined into a two-component cigarette, or the silica gel cooling section and multiple structural units of the heated product are combined into a more than two-component cigarette in a packaging material.

[0019] The present invention will now be described in more detail. DETAILED DESCRIPTION OF THE INVENTION

[0020] The present invention relates to a silica gel cooling section for heated products.

[0021] The silica gel cooling section is a cylindrical cooling section consisting of a straight-hole smoke flow path having various cross-sectional shapes such as a circle, a triangle, a pentagon, a quincunx, or other irregular shapes, and a flow path wall surrounding the smoke flow path.

[0022] In the present invention, the straight-hole smoke flow path of the silica gel cooling unit can have the following three modes: the first mode is that the straight-hole smoke flow path is located in the center of the silica gel cooling unit, the second mode is that the straight-hole smoke flow path is close to the outer wall of the silica gel cooling unit, and the third mode is a combination of the first and second modes (see Figure 1).

[0023] According to a preferred embodiment of the present invention, the silica gel cooling section is produced by using an existing high-temperature curing molding method to produce a prefabricated silica gel cooling section from silica gel, and the prefabricated silica gel cooling section is maintained at a temperature of 18 to 22°C and a relative humidity of 68 to 72% for more than 24 hours, and the silica gel cooling section is obtained when the water content of the prefabricated silica gel cooling section reaches 1.0 to 3.0% by weight.

[0024] The interior of silica gel has a nanoscale microporous structure, and numerous hydroxyl groups exist on the surface of the micropores. Hydroxyl groups have an affinity for water molecules, so they can absorb water to form bound water, which does not easily evaporate at room temperature. The prefabricated silica gel cooling unit easily absorbs water in a high-humidity environment. After multiple tests, the prefabricated silica gel cooling unit can stably reach the water content under the above conditions.

[0025] When prefabricated silica gel cooling parts are made from silica gel using existing high-temperature curing molding methods, the silica gel must be cured at high temperatures for 2 to 6 hours to achieve the desired hardness and shape. After curing, the water content of the silica gel is very low or essentially water-free. Therefore, the high-temperature cured and molded silica gel must be hydrated to reduce the water content of the silica gel to 1.0 to 3.0 wt.%.

[0026] When a heated product is used, the temperature of the smoke emitted is very high. When the smoke comes into contact with the silica gel, it heats it up and evaporates the water in it. The process of water evaporation requires a lot of heat, which causes the temperature of some of the smoke to drop.

[0027] The moisture content of the silica gel in the silica gel cooling unit is 1.0-3.0% by weight. If the moisture content is lower than 1%, it is too low to achieve a significant cooling effect. If the moisture content is higher than 3%, excess moisture will diffuse into the smoke-emitting unit or other structural units, which will easily cause tobacco mold and affect product quality. The moisture content of the silica gel is preferably 2.0-3.0%. The moisture content of the present invention is tested according to the test method specified in GB / T 23357-2009 (Tobacco and tobacco products - Determination of moisture content - Karl Fischer method).

[0028] In the present invention, the high-temperature curing molding method is extrusion molding, film press molding, injection molding, or adhesive drop molding. Among them, extrusion molding is a continuous molding process in which silica gel is extruded and molded using an existing commercially available extruder. See Chinese Patent No. 102642291, entitled "Method for Manufacturing Large-Diameter Silicone Tube." Film press molding involves placing silica gel raw materials and corresponding auxiliary materials into a high-temperature mold, then applying pressure through a flat vulcanizer table to form the product through high-temperature vulcanization. See Chinese Patent No. 101973128, entitled "Method for Manufacturing Roll-Type Silicone Rubber Film." Injection molding is performed by using a silica gel ejector to press the silica gel component into the loading barrel of an output machine, and then using a nozzle to force the silica gel component into the high-temperature mold cavity to form the product. For details, see Chinese Patent Application Publication No. 107639787, entitled "Process for Forming a Silica Gel Layer on the Surface of a Glass Bottle by Injection Molding." Adhesive drip molding is a method in which liquid silica gel material is loaded into a needle cylinder and dripped onto a mold using air pressure, then heated and vulcanized for molding. For details, see Zhang, et al. "Liquid Silica Gel Molding Technology and Its Application", China Rubber / Plastics Technology and Equipment, 2012, 38 (18): 35-38.

[0029] The silica gel used in the present invention is food-grade silicone rubber, such as methyl silicone rubber sold by Shenzhen Muwei Technology Co., Ltd. under the trade name dimethyl silicone rubber, methyl vinyl silicone rubber sold by Shenzhen Muwei Technology Co., Ltd. under the trade name vinyl silicone rubber, methyl vinyl phenyl silicone rubber sold by Anhui Aiyueta Silicon Oil Co., Ltd. under the trade name low phenyl silicone rubber, nitrile silicone rubber sold by Hubei Xinhai Nano Silicon Industry Co., Ltd. under the trade name butyronitrile silicone rubber, and fluorosilicone rubber sold by Dongguan Huadai Organic Silicon Co., Ltd. under the trade name γ-trifluoropropylmethylpolysiloxane, which are currently sold on the market.

[0030] In the present invention, the thermal decomposition temperature of the silica gel in the cooling section exceeds 300°C. When the smoking set heats the smoking section, it can increase the local temperature. During the smoking process of a heated tobacco product, the temperature of the smoke is above 200°C. The temperature rises due to the long-term accumulation of smoke, so the cooling material must have a certain heat resistance. The temperature was determined in accordance with GB / T 19466.4-2016 (Plastics - Differential Scanning Calorimetry (DSC) - Part 3: Determination of Melting and Crystallization Temperature and Enthalpy). If the thermal decomposition temperature of the silica gel in the cooling section is lower than 300°C, the silica gel will undergo thermal breakdown or melt during smoking, which will affect the smoothness of smoking and, more seriously, will result in a loss of cooling effect and an adverse impact on the smoking experience.

[0031] According to the present invention, the silica gel has a specific heat capacity of 1.9 to 3.1 kJ / (kg·°C). Specific heat capacity is a physical quantity commonly used in thermodynamics and should be understood as the amount of heat absorbed or released when a unit mass of a substance increases or decreases its temperature by a unit amount. The specific heat capacity of the silica gel of the present invention is 1.9 to 3.1 kJ / (kg·°C). The specific heat capacity is determined in accordance with GB / T 19466.4-2016 (Plastics - Differential Scanning Calorimetry (DSC) - Part 4: Determination of Specific Heat Capacity).

[0032] If the specific heat capacity of silica gel is lower than 1.9 kJ / (kg·°C), the cooling part per unit weight will absorb less heat, and the temperature of the smoke will not drop significantly, resulting in a higher smoke temperature. If the specific heat capacity of silica gel is higher than 3.1 kJ / (kg·°C), the cooling part per unit weight will absorb more heat, resulting in a more obvious condensation of water in the smoke, which will significantly reduce the moisture content of the smoke and dry the smoke. Therefore, silica gel should have a specific heat capacity of 1.9 to 3.1 kJ / (kg·°C), preferably 2.2 to 2.8 kJ / (kg·°C).

[0033] In the present invention, the smoke temperature is reduced by the dual effects of the evaporation and endothermic heat of silica gel-bound water and the specific heat capacity of silica gel.

[0034] According to the present invention, the ratio of the cross-sectional area of ​​the smoke flow passage to the cross-sectional area of ​​the non-smoke flow passages of the silica gel cooling unit is 0.3 to 2.0. In the present invention, the cross-sectional area of ​​the smoke flow passage should be understood as the sum of the cross-sectional areas of all smoke flow passages at any cross-section of the entire silica gel cooling unit, and the cross-sectional area of ​​the non-smoke flow passage should be understood as the sum of the cross-sectional areas of all non-smoke flow passages at any cross-section of the entire silica gel cooling unit. If the ratio of the cross-sectional area of ​​the smoke flow passage to the cross-sectional area of ​​the non-smoke flow passages is less than 0.3, the smoke flow passage will be small, resulting in high resistance to drawing during the smoking process and insufficient smoke concentration. If the ratio of the cross-sectional area of ​​the smoke flow passage to the cross-sectional area of ​​the non-smoke flow passages is greater than 2.0, the smoke flow passage will be too large and the heat capacity of the silica gel cooling unit will be insufficient, resulting in high smoke temperatures and the temperature of the mouth end of the tobacco cartridge, which will affect the smoking experience.

[0035] According to the present invention, the silica gel cooling part has a length of 5 to 50 mm, an outer diameter of 4.0 to 8.0 mm, and a Shore hardness of 20 to 80 degrees. If the length of the silica gel cooling part is longer than 50 mm, the smoke path will be too long, reducing the amount of smoke per puff. If the length of the silica gel cooling part is shorter than 5 mm, the smoke path will be too short, resulting in insufficient cooling of the smoke and an excessively high temperature, which will affect the smoking experience.

[0036] The outer diameter of the silica gel cooling part is 4.0 to 8.0 mm, which is the outer diameter commonly used in existing commercially available cigarettes.

[0037] Shore hardness is a standard that represents the hardness of rubber and is measured in accordance with GB / T 2411-2008 (Plastics and Ebonite - Determination of Indentation Hardness by Durometer (Shore Hardness)). The silica gel cooling part has a Shore hardness of 20 to 80 degrees. If the Shore hardness of the silica gel cooling part is less than 20 degrees, it will have insufficient moldability, resulting in a poor appearance that is not conducive to cigarette molding. If the Shore hardness of the silica gel cooling part is greater than 80 degrees, it will not be easy to separate during the cigarette molding process, resulting in an unclean cut edge. Preferably, the silica gel cooling part has a Shore hardness of 30 to 70 degrees, more preferably 38 to 62 degrees.

[0038] According to the present invention, the silica gel in the silica gel cooling section contains a floral, mint, fruit, or tobacco flavor. These flavors are added to the silica gel when rubber is mixed, in an amount of 0.1 to 50.0% by weight of the silica gel. When smoke passes through the silica gel cooling section, aromatic substances contained in the silica gel are eluted by the heat of the smoke, thereby enhancing the aroma of the smoke, such as the aroma of flowers such as rose, gardenia, or osmanthus, the flavor of mint such as menthol, peppermint, or Asiatic mint, and the aroma of fruits such as pawpaw, passion fruit, or kiwi.

[0039] The floral aroma essence, mint essence, fruit aroma essence, and tobacco essence used in the present invention are products currently available on the market, such as the rose aroma essence sold by Yunnan Bagu Biotechnology Co. Ltd. under the trade name Ku-shui rose, the Asian mint essence sold by Yunnan Bagu Biotechnology Co. Ltd. under the trade name Touxinliang, the passion fruit aroma essence sold by Yunnan Bagu Biotechnology Co. Ltd. under the trade name Passion Fruit, and the burley tobacco essence sold by Yunnan Henggang Technology Co. Ltd. under the trade name Mixed Tobacco Flavor.

[0040] In the present invention, the silica gel cooling section and the smoking section are packaged together in a packaging material to form a cigarette with a dual structure, or the silica gel cooling section and multiple structural units of the heated product are packaged together in a cigarette with a more-than-dual structure. For example, a dual-structure cigarette is a cigarette consisting of a smoking section and a silica gel cooling section, and a more-than-dual-structure cigarette is a cigarette consisting of a smoking section, a filtering section, a supporting section, and a silica gel cooling section. The smoking section is, for example, a sheet-type smoking section. The filtering section is, for example, an acetate fiber filter rod, and the supporting section is, for example, a hollow paper tube. For specific structural details, see Figure 2.

[0041] The methods for measuring the smoke density and the smoke temperature and the sensory evaluation method will be described later.

[0042] In accordance with GB / T 19609-2004 (Tobacco - Determination of Total and Nicotine-Free Dry Weight Substances Using a Repeated Analysis Smoking Machine) and GB / T 16447-2004 (Tobacco and Tobacco Products - Conditioned and Testing Atmospheres), a MYUZ smoking set manufactured by Dongguan Juwei Electronics Co., Ltd. was used, smoke density was detected using a smoke density detector manufactured by Dongguan Feihong Instrument Equipment Co., Ltd., and the smoke temperature of the cartridge was determined using a K-type thermocouple temperature detector. Sensory evaluation of the tobacco aroma was performed in accordance with GB 5606.4-2005 (Tobacco - Part 4: Technical Requirements for Sensory Evaluation). At the same time, a heated HEETs original flavor cartridge manufactured by Philip Morris International was also detected and evaluated as control 1.

[0043] The silica gel cooling unit for heated products of the present invention has the following features: 1. The silica gel cooling element of the present invention has a relatively high specific heat capacity. During the smoking process, the silica gel cooling element exchanges heat with the high-temperature smoke. By absorbing the heat from the smoke, the temperature of the smoke is reduced, resulting in a slight change in the temperature of the entire silica gel element, ensuring a reduction in the temperature of the mainstream smoke and the mouth end, making smoking more comfortable. 2. When the moisture in the silica gel cooling unit of the present invention comes into contact with smoke that is higher than 150°C during the smoking process, it will evaporate and absorb heat, thereby reducing the temperature of a portion of the smoke. 3. The silica gel cooling part of the present invention has good heat resistance and will not collapse during the smoking process, thus ensuring the smooth flow of smoke. 4. An aroma loading step is added in the processing process to enrich the aroma during smoking and improve smoking comfort.

[0044] The beneficial effects of the present invention are as follows: The silica gel cooling element of the present invention has the physical properties of high air permeability, high specific heat capacity, and good heat resistance. The temperature of the smoke is reduced by double cooling, i.e., the endothermic heat generated by the evaporation of bound water in the silica gel and the specific heat capacity of the silica gel. Furthermore, since there is no thermal breakdown or melting during smoking, the smoke concentration increases while the smoke temperature decreases. The addition of flavoring substances enriches the tobacco flavor and provides a satisfying consumer experience. [Brief explanation of the drawings]

[0045] [Figure 1] 1 is a cross-sectional view of a silica gel portion for a heated product of the present invention. [Figure 2] 1 is a schematic diagram of the location of the silica gel portion for the heated product of the present invention in the cartridge.

[0046] The present invention will be better understood from the following examples. [Example]

[0047] Example 1: Silica gel cooling element for a heated product of the present invention The implementation of this embodiment is as follows.

[0048] The silica gel cooling section is a cylindrical cooling section consisting of a straight-hole smoke flow passage with a circular cross section and a flow passage wall surrounding the smoke flow passage, the straight-hole smoke flow passage is located at the center of the silica gel cooling section, and the ratio of the cross-sectional area of ​​the smoke flow passage to the cross-sectional area of ​​the non-flow passage is 0.8.

[0049] A prefabricated silica gel cooling section was prepared using the extrusion high-temperature curing molding method described herein with food-grade methylsilicone rubber silica gel, which has a thermal decomposition temperature exceeding 300°C and is sold by Shenzhen Muwei Technology Co., Ltd. under the trade name Dimethylsilicone Rubber. The silica gel cooling section was then maintained at a temperature of 22°C and a relative humidity of 68% for 24.5 hours. Using the detection method described herein, the moisture content of the prefabricated silica gel cooling section was detected to reach 1.5% by weight, resulting in a silica gel cooling section. The silica gel cooling section was 50 mm long and had an outer diameter of 5.6 mm. Using the method described herein, its Shore hardness was determined to be 20°C and its specific heat capacity was determined to be 2.1 kJ / (kg·°C). It contained rose fragrance essence sold by Yunnan Bagu Biotechnology Co., Ltd. under the trade name Ku-shui rose.

[0050] The silica gel cooling section and sheet-type smoke generating section are packaged in a dual-structure cigarette using existing molded paper packaging material.

[0051] According to the methods described in the specification of this application, the smoke temperature, smoke density and sensory evaluation were detected, and the detection results and smoking evaluation results are shown in Table 1.

[0052] At the same time, as control 1, a heated HEETs original flavor cartridge manufactured by Philip Morris International was also detected and evaluated in the same manner, and the detection results and smoking evaluation results are also shown in Table 1.

[0053] Example 2: Silica gel cooling element for a heated product of the present invention The silica gel cooling section is a cylindrical cooling section consisting of a straight-hole smoke passage with a pentagonal cross section and a passage wall surrounding the smoke passage. The straight-hole smoke passage is located in the center of the silica gel cooling section. The ratio of the cross-sectional area of ​​the smoke passage to the cross-sectional area of ​​the non-passage is 1.2.

[0054] A prefabricated silica gel cooling section was fabricated using a food-grade methyl vinyl silicone rubber silica gel with a thermal decomposition temperature exceeding 300°C, sold by Shenzhen Muwei Technology Co., Ltd. under the trade name Vinyl Silicone Rubber, by using the film press high-temperature curing molding method described herein, followed by maintaining the temperature at 18°C ​​and 70% relative humidity for 24.8 hours. Using the detection method described herein, the moisture content of the prefabricated silica gel cooling section was detected to reach 1.8 wt.%, resulting in a silica gel cooling section. The silica gel cooling section was 30 mm long and had an outer diameter of 6.5 mm. According to the method described herein, its Shore hardness was determined to be 60°C and its specific heat capacity was determined to be 2.8 kJ / (kg·°C). It contained Asian mint essence, sold by Yunnan Bagu Biotechnology Co., Ltd. under the trade name Touxinliang.

[0055] The silica gel cooling section and sheet-type smoke generating section are packaged in a dual-structure cigarette using existing molded paper packaging material.

[0056] Example 3: Silica gel cooling element for a heated product of the present invention The silica gel cooling section is a cylindrical cooling section consisting of a straight-hole smoke passage with a quincunx cross section and a passage wall surrounding the smoke passage. The straight-hole smoke passage is adjacent to the outer wall of the silica gel cooling section. The ratio of the cross-sectional area of ​​the smoke passage to the cross-sectional area of ​​the non-passage is 1.6.

[0057] A prefabricated silica gel cooling section was fabricated using the injection high-temperature curing molding method described herein with a food-grade methyl vinyl phenyl silicone rubber with a thermal decomposition temperature exceeding 300°C, sold by Anhui Aiyueta Silicon Oil Co., Ltd. under the trade name Low Phenyl Silicone Rubber, followed by 25.2 hours at a temperature of 20°C and a relative humidity of 72%. Using the detection method described herein, the moisture content of the prefabricated silica gel cooling section was detected to reach 2.5% by weight, resulting in a silica gel cooling section. The silica gel cooling section was 18 mm long and had an outer diameter of 7.0 mm. Using the method described herein, its Shore hardness was determined to be 50°C and its specific heat capacity was determined to be 2.5 kJ / (kg·°C). It contained passion fruit aromatic essence, sold by Yunnan Bagu Biotechnology Co., Ltd. under the trade name Passion Fruit.

[0058] The silica gel cooling section and sheet-type smoke generating section are packaged in a dual-structure cigarette using existing molded paper packaging material.

[0059] Example 4: Silica gel cooling element for a heated product of the present invention The silica gel cooling section is a cylindrical cooling section consisting of a straight-hole smoke channel with a pentagonal cross section and a channel wall surrounding the smoke channel. There are a total of 20 straight smoke channels, 10 located in the center of the silica gel cooling section and 10 adjacent to the outer wall of the silica gel cooling section. The ratio of the cross-sectional area of ​​the smoke channel to the cross-sectional area of ​​the non-channel is 1.9.

[0060] A prefabricated silica gel cooling section was fabricated using the adhesive drop high-temperature curing molding method described herein with a food-grade nitrile silicone rubber silica gel with a thermal decomposition temperature exceeding 300°C, sold by Hubei Xinhai Nano Silicon Industry Co., Ltd. under the trade name Butyronitrile Silicone Rubber, followed by 24.8 hours at a temperature of 18°C ​​and a relative humidity of 70%. Using the detection method described herein, the moisture content of the prefabricated silica gel cooling section was detected to reach 3.0% by weight, resulting in a silica gel cooling section. The silica gel cooling section was 25 mm long and had an outer diameter of 8.0 mm. According to the method described herein, its Shore hardness was determined to be 30°C and its specific heat capacity was determined to be 2.3 kJ / (kg·°C). It contained burley tobacco essence, sold by Yunnan Henggang Technology Co., Ltd. under the trade name Mixed Tobacco Flavor.

[0061] The silica gel cooling unit, the existing sheet-type smoke generating unit and the acetate fiber filtering unit are packaged in a molded paper packaging material to form a three-component cigarette.

[0062] Example 5: Silica gel cooling element for a heated product of the present invention The silica gel cooling section is a cylindrical cooling section consisting of a straight-hole smoke channel with an irregular cross section (see the lower right diagram in Figure 1) and a channel wall surrounding the smoke channel. The straight smoke channel is located in the center of the silica gel cooling section. The ratio of the cross-sectional area of ​​the smoke channel to the cross-sectional area of ​​the non-channel is 1.8.

[0063] A prefabricated silica gel cooling section was fabricated using the injection high-temperature curing molding method described herein with a food-grade fluorosilicone rubber silica gel with a thermal decomposition temperature exceeding 300°C, sold by Dongguan Huadai Organic Silicon Co., Ltd. under the trade name γ-trifluoropropylmethylpolysiloxane, followed by 24.2 hours at a temperature of 20°C and a relative humidity of 68%. Using the detection method described herein, the moisture content of the prefabricated silica gel cooling section was detected to have reached 2.2% by weight, resulting in a silica gel cooling section. The silica gel cooling section was 40 mm long and had an outer diameter of 5.0 mm. When detected using the method described herein, the silica gel cooling section had a Shore hardness of 80°C and a specific heat capacity of 3.1 kJ / (kg·°C). It contained pawpaw fruit essence sold by Yunnan Bagu Biotechnology Co., Ltd. under the trade name Papaya.

[0064] The silica gel cooling section and sheet-type smoke generating section are packaged in a dual-structure cigarette using existing molded paper packaging material.

[0065] Example 6: Silica gel cooling element for a heated product of the present invention The silica gel cooling section is a cylindrical cooling section consisting of a straight-hole smoke channel with a circular cross section and a channel wall surrounding the smoke channel. There are a total of 40 straight-hole smoke channels, 14 of which are located in the center of the silica gel cooling section and 26 of which are adjacent to the outer wall of the silica gel cooling section. The ratio of the cross-sectional area of ​​the smoke channel to the cross-sectional area of ​​the non-channel section is 2.0.

[0066] A prefabricated silica gel cooling section was prepared using the extrusion high-temperature curing molding method described herein with a food-grade methylsilicone rubber silica gel with a thermal decomposition temperature exceeding 300°C, sold by Shenzhen Muwei Technology Co., Ltd. under the trade name Dimethylsilicone Rubber, followed by 25.8 hours at a temperature of 22°C and a relative humidity of 72%. Using the detection method described herein, the moisture content of the prefabricated silica gel cooling section was detected to reach 1.0% by weight, resulting in a silica gel cooling section. The silica gel cooling section had a length of 5 mm and an outer diameter of 4.0 mm. When detected using the method described herein, its Shore hardness was 70°C and its specific heat capacity was 1.9 kJ / (kg·°C). It contained burley tobacco essence, sold by Yunnan Henggang Technology Co., Ltd. under the trade name Mixed Tobacco Flavor.

[0067] The silica gel cooling section, the existing sheet-type smoke generating section, the acetate fiber filtering section and the hollow paper tube section are combined into a four-component cigarette with a molded paper packaging material.

[0068] The smoke temperature, smoke density and sensory evaluation of Examples 1 to 6 were measured using the methods described in the Summary of the Invention, and the results of the detection and smoking evaluation are shown in Table 1.

[0069] [Table 1]

[0070] The results in Table 1 clearly show that the smoke temperature of the heat-not-burn product containing the silica gel cooling section is reduced by approximately 4-7°C compared to the HEETs control sample, with a difference in smoke density of at least 14.1%. In terms of smoke volume, the dual-component cartridge packaged with the smoke-producing section performs significantly better than the multi-component cartridges. The sensory evaluation results show that the cooling section of the control sample experiences a breakdown not seen in Examples 1-6. Overall, the silica gel cooling sections of Examples 1-6 have lower smoke temperatures and higher smoke density than the control sample. Heat-not-burn products with silica gel cooling sections according to the present invention possess the dual properties of lower smoke temperature and higher smoke density. [Explanation of symbols]

[0071] 1 silica gel part 1-1 Outer groove 1-2 Inner groove 2 Smoke channel 3. Smoking section 4 Filtration section 5 Support part 6 Empty tube part

Claims

1. 1. A silica gel cooling unit for a heated product, the silica gel cooling unit being a cylindrical cooling unit consisting of a smoke flow path with linear holes having a cross section that is circular, triangular, pentagonal, or quincunx-shaped, and a flow path wall that surrounds the smoke flow path, the water content of the silica gel in the silica gel cooling unit being 1.0 to 3.0% by weight, the silica gel in the silica gel cooling unit being a food-grade silicone rubber material selected from methyl silicone rubber, methyl vinyl silicone rubber, methyl vinyl phenyl silicone rubber, nitrile silicone rubber, and fluorosilicone rubber, and the silica gel in the silica gel cooling unit having a specific heat capacity of 1.9 to 3.1 kJ / (kg°C).

2. 2. The silica gel cooling section for a heated product according to claim 1, wherein the silica gel cooling section is produced by preparing a prefabricated silica gel cooling section from silica gel using an existing high-temperature curing molding method, and the prefabricated silica gel cooling section is maintained at a temperature of 18 to 22°C and a relative humidity of 68 to 72% for more than 24 hours, and the silica gel cooling section is obtained when the moisture content of the prefabricated silica gel cooling section reaches 1.0 to 3.0% by weight.

3. The silica gel cooling section for a heated product according to claim 2, wherein the high-temperature curing molding method is extrusion molding, film press molding, injection molding or adhesive drop molding.

4. 2. The silica gel cooling unit for a heated product according to claim 1, wherein the silica gel in the silica gel cooling unit has a thermal decomposition temperature of 300°C or higher.

5. 2. The silica gel cooling section for heated products according to claim 1, wherein the ratio of the cross-sectional area of ​​the smoke flow passage to the cross-sectional area of ​​the non-flow passage of the silica gel cooling section is 0.3 to 2.

0.

6. 2. The silica gel cooling section for heated products according to claim 1, wherein the silica gel cooling section has a length of 5 to 50 mm, an outer diameter of 4.0 to 8.0 mm, and a Shore hardness of 20 to 80 degrees.

7. 2. The silica gel cooling unit for a heated product according to claim 1, wherein the silica gel in the silica gel cooling unit contains a floral, mint, fruit or tobacco flavoring.

8. 2. The silica gel cooling section for a heated product according to claim 1, wherein the silica gel cooling section and the smoking section are combined into a two-component cigarette, or the silica gel cooling section and multiple structural units of the heated product are combined into a more than two-component cigarette using a packaging material.

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