Fiber assembly for an atomizing heating core and method for producing the same

Abstract

The present application discloses a kind of fiber assembly for atomizing heating core and its preparation method, the fiber of the fiber assembly is cellulose fiber, and the microfibrillation grade of cellulose fiber is 1-4 grade, the grammage of the fiber assembly is 40-400 g / m 2 2.5 mm, and the oil content of the fiber assembly is 0.00-0.05%.The fiber assembly for atomizing heating core has excellent liquid absorption and locking performance, is not easy to leak, the fiber assembly pores are uniform, the atomization effect is delicate, the temperature resistance and thermodynamic performance of the material are good, the material is stable after heating, does not deform, has no peculiar smell, has good taste, has long service life, and is suitable for electronic cigarette, atomizer and other fields.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of fiber assembly for atomizing heating core and its preparation method, applied to atomizer and electronic cigarette and other atomizing core field. BACKGROUND

[0002] Electronic cigarette products, because of having rich taste selection, nicotine and other cigarette effective component controllable, also have the advantages such as smoking cessation effect, are widely loved by consumers this year.

[0003] In electronic cigarette product, the most critical component is electronic cigarette atomizing core, which directly determines the atomization effect of tobacco tar and the taste stimulating effect. In the atomizing core, there are two major components, heating metal components and liquid guiding components for oil absorption and storage. The liquid guiding component as the atomizing tobacco tar carrier is the most critical, and its quality directly affects the tobacco tar stimulating effect, the fineness of atomization and the taste restoration degree. Currently, there are two types of tobacco tar guiding components for atomizing core on the market, namely ceramic and fiber assembly. However, these two types of materials have certain problems. For example, ceramic material has a long service life, but the atomization effect is general, the atomized smoke volume is small, and the taste restoration degree is poor. The fiber assembly material has good atomization effect and taste restoration degree, but is prone to oil leakage and has a short service life, which limits its use to some extent. Therefore, developing electronic cigarette atomizing core oil guiding materials with better performance is crucial for the promotion of electronic cigarette products.

[0004] As disclosed in Chinese patent CN114223946A, an atomizing device and its atomizing core are disclosed, which improves the atomization effect by changing the material form and adding protrusions. However, this method cannot fundamentally solve the defects of the original fiber assembly material, and the improvement of atomization effect is limited. SUMMARY

[0005] The present application aims to provide a fiber assembly for atomizing core with good liquid absorption and locking performance, uniform porosity, fine atomization effect, resistance to repeated high temperature, good taste and long service life.

[0006] The technical solution of the present application is as follows:

[0007] A fiber assembly for atomizing heating core, characterized in that the fibers constituting the fiber assembly are cellulose fibers, and the microfibrillation grade of the cellulose fibers is 1-4, the grammage of the fiber assembly is 40-400 g / m 2 , the thickness is 0.3-2.5 mm, and the oil content of the fiber assembly is 0.00-0.50%.

[0008] The decomposition point of the cellulose fibers of the present application is 140-250℃.

[0009] The specific heat capacity of the cellulose fiber of the present application is 1.0-2.0 J / (g·℃).

[0010] The length of the cellulose fiber of the present application is 3-51 mm.

[0011] The mass specific resistance of the cellulose fiber of the present application is 10 6 9 Ω·g / cm 2 .

[0012] The dielectric constant of the cellulose fiber of the present application is 2-15 F / m.

[0013] The limiting oxygen index of the fiber assembly for an atomizing core of the present application is 19-45%.

[0014] The fiber assembly for an atomizing core of the present application comprises the following processing steps: (1) opening, removing impurities and mixing cotton of one or more types of cellulose fibers; (2) after processing by carding, laying or wet laying; (3) processing by multiple passes of ultra-high pressure water needle puncture to cause entanglement and reinforcement of the fibers, and at the same time, microfibrillation of the cellulose fibers; (4) finally drying, winding, slitting and cutting the fiber assembly to produce a fiber assembly for an atomizing heating core.

[0015] The method for preparing the fiber assembly for an atomizing heating core of the present application, the pressure of the ultra-high pressure water needle puncture processing is 100-400 bar.

[0016] The fiber assembly for an atomizing heating core of the present application has a grammage of 200-300 g / m 2 .

[0017] The present application has the following advantages:

[0018] The fiber assembly for an atomizing heating core has excellent liquid absorption and locking performance, good atomization excitation effect, good sealing performance as a liquid guide component of an electronic cigarette, uniform fiber assembly pores, delicate atomization effect, good temperature resistance and thermodynamic performance of the material, stable deformation after heating, good taste and long service life, and is very suitable for the field of atomizing core products such as electronic cigarettes and atomizers. DETAILED DESCRIPTION

[0019] A fiber assembly for an atomizing heating core, characterized in that the fiber constituting the fiber assembly is a cellulose fiber, and the microfibrillation grade of the cellulose fiber is 1-4, the grammage of the fiber assembly is 40-400 g / m 2 , the thickness is 0.3-2.5 mm, and the oil content of the fiber assembly is 0.00-0.50%.

[0020] ​The material of the atomizing core is directly contacted with the tobacco tar, and the atomized tobacco tar is inhaled by human body, so the safety of the material is very important. The fiber material can be classified into cellulose fiber and synthetic polymer fiber according to the chemical composition. The synthetic polymer fiber is a synthetic polymer material, and the material is heated during atomization. The synthetic polymer fiber material is extremely easy to emit harmful substances during heating, which is harmful to human health. Therefore, the material of the present application is selected from the cellulose fiber.

[0021] In addition, the cellulose fiber material can be classified into artificial cellulose fiber and natural cellulose fiber. The natural cellulose fiber is naturally grown, so the specifications, length, fineness and crystallinity of the fiber have large deviations, and the stability of product processing is poor. Especially for the atomizing core material, the slight deviation of the material is very sensitive. The quality specifications of the artificial cellulose fiber can be strictly controlled, and the temperature resistance of the artificial cellulose fiber is better than that of ordinary synthetic fiber and natural fiber. Therefore, the artificial cellulose material or the processed combed cotton fiber is more preferably used to prepare the fiber assembly material of the present application.

[0022] The microfibrillation grade of the cellulose fiber in the fiber assembly of the present application is 1-4. According to the microfibrillation degree of the surface of the cellulose fiber, the microfibrillation grade of the cellulose fiber can be divided into the following grades:

[0023] 0 grade; no microfibril on the fiber

[0024] 1 grade; only a small amount of fine microfibril on the fiber

[0025] 2 grade; more microfibrils on the fiber

[0026] 3 grade; more long microfibrils on the fiber

[0027] 4 grade; a large number of long microfibrils on the fiber, and curling occurs

[0028] 5 grade; a large number of long microfibrils on the fiber, and interwoven

[0029] 6 grade; the main body of the fiber is split, a large number of long microfibrils, and interwoven

[0030] The higher the microfibrillation level is, the more microfibrils on the fiber, and because the microfibril fineness is extremely fine, the specific surface area and surface tension are larger, so the microfibril liquid absorption and retention performance is very good, and the more microfibrils on the fiber, the better the liquid absorption and retention performance of the cellulose fiber and the fiber assembly material made of the cellulose fiber will be; on the other hand, if the microfibrillation degree of the fiber is too high, the main body of the fiber will be damaged, and the strength and service life of the fiber will be greatly reduced, at the same time, the microfibril has a large surface area and is extremely fine, and its temperature resistance is much worse than that of the coarse fiber, so the higher the microfibrillation degree is, the worse the temperature resistance of the material will be, so the microfibrillation level of the cellulose fiber in the fiber assembly of the present application is preferably 2-3 levels, more preferably 2 levels.

[0031] The grammage of the fiber assembly of the present application is 40-400 g / m 2 The higher the grammage of the fiber assembly is, the better the absorption and retention performance of the tobacco tar will be, and the atomizing heating core is heated by heating the metal wire to heat the fiber assembly wrapped thereon, thereby atomizing the tobacco tar, when the grammage of the fiber assembly is too high, the absorbed tobacco tar is too much, which is extremely easy to cause the atomization temperature to be insufficient, and the tobacco tar cannot be fully atomized, at this time, the flavor and sweetness of the atomized tobacco tar will be insufficient, and the waste of the tobacco tar and other related problems will also be caused. At the same time, in the actual application process, in order to make the atomization process of the atomizing heating core more uniform and stable, multiple layers of fiber assemblies are generally used to wrap the heating wire, and the number of layers of the fiber assembly cannot be too much or too little, and generally 2-6 layers are the best, and the number of layers is too small, the liquid carrying capacity of the fiber is not enough, and the uniformity of wrapping is poor, especially at the lap joint, the effect will be obviously different, and the number of layers is too much, which will increase the processing difficulty, and the consistency and stability of the atomizing core product will be poor, and the number of layers is too much, which will affect the consistency of the liquid guiding speed. In addition, if multiple layers of fiber assemblies are used, the lamination between the layers is limited by the thickness deviation of the fiber assembly itself, and there will be gaps in the lamination, so the number of layers should not be too much, otherwise the size stability, uniformity of pores, and liquid guiding speed of the non-woven fabric after lamination will be poor. Therefore, the grammage of the fiber assembly of the present application is preferably 70-350 g / m 2 , more preferably 120-320 g / m 2 .

[0032] The thickness of the fiber assembly of the present application is 0.3-2.5 mm. The thicker the thickness of the fiber assembly, the more oil is absorbed. Too much oil absorption may cause insufficient atomization. In addition, too much oil absorption and too thick thickness may cause the air exchange performance of the atomization core to decrease, and air cannot be pressed into the electronic cigarette through the internal and external air pressure difference, causing problems such as insufficient oil supply and dry burning. On the other hand, if the thickness of the fiber assembly is too thin, the oil absorption of the fiber assembly is insufficient, which may also cause insufficient atomization. In addition, the sealing effect of the thin fiber assembly is poor, and the oil in the electronic cigarette may also leak from the atomization core. Therefore, the thickness of the fiber assembly of the present application is preferably 0.6-1.2 mm, and more preferably 1.0-2.0 mm.

[0033] The oil content of the fiber assembly of the present application is 0.00-0.50%. In the process of using and processing the fiber, a certain amount of chemical oil agent is added to the fiber to prevent static electricity and friction. The chemical oil agent is mostly a surfactant, which not only has a foul odor, but also has certain harm to the human body. The oil content on the surface of the general fiber is 0.80-2.50%. If the oil agent is not removed, it will not only greatly affect the taste of the atomized smoke, but also have safety hazards to the human body. Therefore, the processing technology of the fiber assembly of the present application is preferably a processing technology with good oil removal effect, such as wet-laid and water needle puncture processing technology. Considering the taste of the fiber assembly, the oil content of the fiber assembly is more preferably 0.00-0.25%.

[0034] The fiber assembly for the atomization heating core of the present application, wherein the fiber strength of the cellulose fiber is above 0.06 cN / dtex. If the fiber strength is too low, the fiber assembly is also easily damaged, causing the service performance to decrease and the service life to decrease. In addition, the lower fiber strength indicates that the crystallinity of the fiber is also lower, and the lower crystallinity indicates that the heat resistance and durability of the material will also be poorer.

[0035] The fiber assembly for the atomization heating core of the present application, wherein the decomposition point of the cellulose fiber is 140-250℃. The principle of the atomization heating core is to heat the fiber assembly after absorbing the tobacco tar with a metal wire, so as to atomize the tobacco tar. In this process, the fiber assembly is in a state of being repeatedly heated, so the temperature resistance of the fiber is very important. If the temperature resistance of the fiber is insufficient, the material will decompose, not only the taste of the atomized smoke will be poor, but also there will be the risk of harmful substances volatilizing. The main components of the tobacco tar are glycerol and propylene glycol, and the temperature during general atomization after blending is 150-220℃. However, the volatilization of the tobacco tar will quickly take away a certain amount of heat, so the temperature resistance of the cellulose fiber needs to be 140-200℃. Therefore, the decomposition point of the cellulose fiber of the fiber assembly for the atomization heating core of the present application is preferably 150-220℃, and more preferably 160-200℃.

[0036] The specific heat capacity of the cellulose fiber of the fiber assembly for the atomizing heating core of the present application is 1.0-2.0 J / (g·℃). The specific heat capacity is measured at a temperature of 20 degrees. When the heating wire heats the fiber assembly, the cellulose fiber will inevitably absorb heat. If the specific heat capacity of the fiber is low, the temperature rises quickly, which can easily cause damage to the fiber, and can also cause problems such as excessive instantaneous excitation and uneven atomization. If the specific heat capacity of the fiber is too large, the fiber has a stronger ability to absorb heat, and too much heat can be absorbed by the fiber during heating, which can greatly reduce the atomization effect of the tobacco tar. The specific heat capacity of the fiber is generally changed by adjusting the crystallinity of the fiber and the processing technology. The specific heat capacity of the cellulose fiber of the present application is more preferably 1.2-1.8 J / (g·℃).

[0037] The length of the cellulose fiber of the fiber assembly for the atomizing heating core of the present application is 3-51 mm. The fiber assembly material of the present application can be a wet process or a dry process. If the fiber length is too long or too short, it cannot be formed into a web. In addition, if the fiber length is too short, the fibers in the fiber assembly are prone to shedding, and if the fiber length is too long, the fibers are prone to uneven distribution, which can affect the atomization effect. Therefore, the length of the cellulose fiber of the fiber assembly of the present application is more preferably 6-38 mm.

[0038] The mass specific resistance of the cellulose fiber of the fiber assembly for the atomizing heating core of the present application is 10 6 9 Ω·g / cm 2 . The heating principle of the atomizing heating core is electric heating. According to Joule's law, if the resistance of the fiber material is too small, the fiber itself will generate a large amount of heat, which can cause the fiber to easily accumulate heat and concentrate, resulting in poor heat resistance, reduced service life, and other problems. If the resistance of the fiber material is too large, the material is in a completely insulating state, and its heat conduction and electrical conduction effects are poor, the energy transfer efficiency is low, and the atomization efficiency is reduced. Therefore, the mass specific resistance of the cellulose fiber in the atomizing heating core of the present application is more preferably 10 7 8 Ω·g / cm 2 .

[0039] ​​The dielectric constant of the cellulose fiber of the fiber assembly for the atomization heating core of the present application is 2-15 F / m. The dielectric constant is usually used to represent the dielectric loss of the material, that is, under the action of an electric field, the polar groups of the fiber material and the water molecules inside the fiber will be polarized, and part of the polarized molecules will be arranged in the direction of the electric field and move in the direction of the electric field, and in this process, the molecules will collide, rub, generate heat, and consume energy. If the dielectric constant of the material is too large, the energy loss will increase, and the atomization efficiency will decrease; if the dielectric constant of the material is too small, although the energy loss will be small, the material will tend to be insulating and heat-insulating at this time, so the efficiency of energy conduction will be reduced, which will also lead to a decrease in the atomization efficiency. Therefore, the dielectric constant of the cellulose fiber material of the present application is more preferably 5-10 F / m.

[0040] The limiting oxygen index of the fiber assembly for the atomization heating core of the present application is 19-45%, which represents the temperature resistance and flame retardant performance of the reaction material. If the limiting oxygen index is too low, the temperature resistance is poor and the service life will be poor, and if the limiting oxygen index is too high, the temperature resistance and flame resistance of the material will be good, but in order to achieve this effect, it is necessary to introduce flame-retardant groups or flame-retardant agents, which will have a great negative impact on the taste of the atomized smoke, so the limiting oxygen index of the atomization heating core of the present application is preferably 22-40%, more preferably 27-35%.

[0041] Common artificial cellulose fiber materials include acetate fiber, viscose fiber, lyocell fiber and cuprammonium fiber, etc. In order to ensure that the material has good strength, decomposition point, specific heat capacity, mass specific resistance and limiting oxygen index, the artificial cellulose fiber of the present application is preferably cellulose acetate fiber, seaweed cellulose fiber, lyocell fiber or modified cellulose acetate fiber and lyocell fiber, seaweed cellulose fiber. The fiber in the fiber assembly for the atomization heating core of the present application can be one of the above fibers, or a combination of the above cellulose fibers.

[0042] The fiber assembly for the atomization heating core of the present application, the preparation method thereof, comprises the following processing steps: (1) opening, removing impurities and mixing cotton of one or more types of cellulose fiber; (2) after carding, laying or wet laying processing, (3) further reinforcing treatment by multi-pass ultra-high pressure water needle puncture processing, and at the same time, the cellulose fiber is microfibrillated, (4) finally, the fiber assembly is dried, wound, slitted and cut to form the fiber assembly for the atomization heating core. After laying, in order to facilitate water needle puncture processing, the fiber web can be first formed by pre-needling reinforcement, and the pre-needling density is 10-50 punctures / cm 2, the needle density is too much, which will cause the needle hole to be too large, and the fiber will be damaged, and too little may not be able to play the effect of pre-compacting the fiber web; the drying temperature after water needle puncture is 90-150 DEG C, which is too low to reduce the production efficiency, and too high to cause the fiber assembly to be hardened and even aged, reduce the liquid absorption and liquid guiding performance, and reduce the service life.

[0043] The preparation method of the fiber assembly of the atomizing heating core of the application, the pressure of the ultra-high pressure water needle puncture processing is 100bar-400bar. In order to make the fiber produce microfibrillation effect, the water needle puncture pressure of the application is higher than that of ordinary water needle puncture product processing. If the water needle puncture pressure is too low, the fiber surface cannot produce microfibril, and the oil removal effect will also be poor, which will seriously affect the taste; on the other hand, if the water needle puncture pressure is too large, the fiber will be seriously damaged, and the service life will also be greatly reduced. Therefore, the water needle puncture pressure of the fiber assembly preparation method of the application is preferably 150-350bar, and more preferably 200-300bar. Especially when the water needle pressure reaches 100bar, the oil removal agent effect is obviously improved, which greatly helps to improve the taste of the atomizing core.

[0044] The high-pressure pump and the water needle plate are the most core components for processing the water needle puncture fiber assembly product, wherein the stability of the medium vibration of the high-pressure pump, the oil tightness of the shaft head, the connecting rod and the plunger, and the durability of the valve group spring directly determine the stability and the maximum pressure limit of the water needle puncture pressure. At the same time, the water needle puncture fiber assembly of the application adopts the ultra-high pressure water needle puncture processing technology, which is more demanding on the selection of the high-pressure pump. After comparing the performance of high-pressure pumps from different manufacturers at home and abroad, the high-pressure pump of URACA is more suitable for the processing of the fiber assembly product of the application.

[0045] In addition, the selection of the water needle plate also has an important influence on the performance of the fiber assembly product. When the fiber assembly of the application is processed by water needle puncture, the aperture of the water needle plate is preferably 0.05-0.15mm, and the hole spacing is preferably 0.4-0.8mm. If the aperture of the water needle plate is too large and the spacing is too small, the water flow cross-sectional area is too large, the water needle puncture pressure is very large to reach the set value, and the water needle pressure stability will also be poor. On the other hand, if the aperture of the water needle plate is too small and the spacing is too large, the water flow cross-sectional area is too small, the pressure on the water needle plate will be too large, which will easily cause the water needle plate to be damaged, and the water needle puncture assembly will be poor in sealing performance.

[0046] The grammage of the fiber assembly of the application is 200g-300g / m 2If the grammage of the fiber assembly is small, less than 200g, in order to increase the liquid carrying capacity of the fiber, multiple layers must be used, and if multiple layers are used, there will be gaps between the layers, which will cause uneven heating and poor atomization effect. If the grammage of the fiber assembly is greater than 300g, the fiber assembly needs to be punctured by a high-pressure water needle, and if the grammage is too large, the water needle cannot penetrate, which will cause the material to easily delaminate and other problems, resulting in poor atomization effect. On the other hand, the present application uses cellulose fiber, which has strong water absorption capacity and will swell after absorbing water, making it difficult for the water needle to penetrate, making the delamination problem worse. In addition, if multiple layers of fiber assemblies are used, the adhesion between the layers is limited by the thickness deviation of the fiber assembly itself. In some places, the thickness error can be offset, but in some places, such as thin and thin places, the density will be low, causing gaps between the layers, which will cause oil leakage, or in some places, such as thick and thick places, the density will be too high, which will cause the liquid guiding speed to be slow. Therefore, multiple layers of fiber assemblies will cause the consistency and stability of the atomization core product to deteriorate. In addition, the conduction direction of the tobacco tar on the heating core is perpendicular to the multiple layers of fiber assemblies, so the liquid guiding speed in this direction is very important. The vertical liquid guiding speed of the multiple layers of fiber assemblies is slower than that of the single layer of fiber assemblies, because the multiple layers of fiber assemblies do not have fibers connected to each other, so the tobacco tar will preferentially infiltrate the fibers horizontally, and when the local fiber oil carrying capacity is sufficient, it will be transmitted to the next layer in the vertical direction. This will result in a much slower vertical liquid guiding speed of the multiple layers of fiber assemblies compared to the single layer of fiber assemblies with the same density and thickness. In summary, compared to the single layer of fiber assemblies, the single layer of fiber assemblies has obvious advantages in terms of liquid guiding speed and product consistency. Therefore, the present application preferably uses a single layer of fiber assembly, and the grammage is more preferably 230-280g / m 2 .

[0047] The fiber assembly of the atomization heating core of the present application is mainly applied in the field of electronic cigarettes. Whether it is an oil storage cotton type electronic cigarette, a cartridge type electronic cigarette, or a cartridge replacement type electronic cigarette, it can be applied. In addition, it can also be applied in the field of medical atomization, heater, etc. BRIEF DESCRIPTION OF DRAWINGS

[0048] Figure 1 The morphological structure of the fiber in the fiber assembly of the atomization heating core of the present application

[0049] The present application is further illustrated by the following examples, but the scope of protection of the present application is not limited to the examples. The various physical property parameters in the examples are measured by the following methods.

[0050]

Microfibril grade

[0051] The fiber morphology of the sample was observed by SEM electron microscope, the magnification was 1000 times, the state of the fiber surface microfibril was randomly observed, and the microfibrillation grade of the fiber was evaluated. The evaluation rating standard is as follows:

[0052] 0 grade; no microfibril on the fiber

[0053] 1 grade; only a small amount of fine microfibril on the fiber

[0054] 2 grade; there are more microfibrils on the fiber

[0055] 3 grade; there are more long microfibrils on the fiber

[0056] 4 grade; there are a large number of long microfibrils on the fiber, and curling occurs

[0057] 5 grade; there are a large number of long microfibrils on the fiber, and they are intertwined with each other

[0058] 6 grade; the main body of the fiber is split, there are a large number of long microfibrils, and they are intertwined with each other

[0059]

Fiber assembly grammage

[0060] After the fiber assembly sample was conditioned at 20±2℃×65±4% in the laboratory for 24h, the mass of the sample was measured by an electronic balance, and then the grammage value was converted according to the sample size.

[0061]

Fiber assembly thickness

[0062] After the fiber assembly sample was conditioned at 20±2℃×65±4% in the laboratory for 24h, the thickness of the material was measured by a TECLOCK SM-114 thickness meter, and the test result was two decimal places.

[0063]

Oil content

[0064] According to the test method recorded in the national standard GB / T6504-2017, the oil content of the fiber assembly was tested, wherein the extraction solvent was diethyl ether, and the drying temperature was 105℃.

[0065]

Decomposition point

[0066] The TG thermogravimetric curve of the sample was determined by a thermal gravimetric analyzer, and the extrapolated starting point of the TG curve was the decomposition point of the material.

[0067] TG curve extrapolated starting point: the intersection point of the tangent line at the TG step and the tangent line at the inflection point of the curve.

[0068]

Specific heat capacity of fiber

[0069] The heat absorbed or released by unit mass of fiber when its temperature changes 1℃ is measured by a micro-calorimeter, which is the specific heat capacity of the fiber (the measurement temperature is 20℃).

[0070]

Fiber length

[0071] The length of the fiber in the fiber assembly is measured by a ruler.

[0072] If the fiber in the fiber assembly is raw cotton, the length of the fiber can be measured according to the test method described in GB / T14336-2008.

[0073]

Fiber mass specific resistance

[0074] The measurement method of mass specific resistance is the ratio of voltage per unit length to current flowing through unit linear density fiber. The mass specific resistance of the raw cotton fiber for preparing the fiber assembly is tested according to the method described in GB / T14342-2015.

[0075]

Fiber dielectric constant

[0076] The dielectric constant of the fiber assembly or the raw cotton fiber for preparing the fiber assembly is measured according to the method described in GB / T1409-2006.

[0077]

Fiber limiting oxygen index

[0078] The limiting oxygen index of the fiber assembly or the raw cotton fiber for preparing the fiber assembly is measured according to the method described in GB / T2406.2-2009.

[0079]

Taste

[0080] The fiber assembly is prepared into an atomization core and loaded into an electronic cigarette filled with tobacco tar. Ten test personnel are selected to conduct blind test on the electronic cigarette product. The taste, taste restoration degree, and wetness degree are comprehensively evaluated to evaluate the taste of the product. The evaluation grades are: excellent, good, medium, general, and poor.

[0081]

Life

[0082] The fiber assembly is prepared into an atomization core and loaded into an electronic cigarette cartridge filled with 5ml of tobacco tar. The electronic cigarette cartridge is loaded into an electronic cigarette rod. The electronic cigarette is smoked by an automatic smoking machine. After one puff by the evaluator, the automatic smoking machine puffs 99 times, and so on. When the evaluator finds that the product is damaged, leaks, or the taste is seriously deteriorated, the experiment is stopped. The number of puffs at this time is used to represent the service life of the material. If 5ml of tobacco tar is completely smoked or the taste is still good after 500 puffs, it is recorded as excellent.

[0083] Example 1

[0084] Lyocell cellulose fibers with a decomposition point of 160°C and a fiber length of 38 mm are opened, decontaminated, then carded, laid, and then reinforced and fibrillated by multiple passes of water needle puncture to produce a water needle punctured fiber assembly. The fiber assembly produced is then dried, wound, slitted, and punched to produce a fiber assembly material for an atomizing heating core. In the multiple water needle puncture process, the maximum water needle puncture pressure is 200 bar, the microfibrillation level of the fibers in the fiber assembly reaches level 2, the fiber assembly has a grammage of 200 g / m 2 , a thickness of 0.8 mm, an oil content of 0.01%, and the remaining physical property parameters are shown in Table 1.

[0085] Example 2

[0086] Lyocell cellulose fibers with a decomposition point of 160°C and a fiber length of 38 mm are opened, decontaminated, then carded, laid, and then reinforced and fibrillated by multiple passes of water needle puncture to produce a water needle punctured fiber assembly. The fiber assembly produced is then dried, wound, slitted, and punched to produce a fiber assembly material for an atomizing heating core. In the multiple water needle puncture process, the maximum water needle puncture pressure is 120 bar, the microfibrillation level of the fibers in the fiber assembly reaches level 1, the fiber assembly has a grammage of 200 g / m 2 , a thickness of 0.8 mm, an oil content of 0.01%, and the remaining physical property parameters are shown in Table 1.

[0087] Example 3

[0088] Lyocell cellulose fibers with a decomposition point of 160°C and a fiber length of 38 mm are opened, decontaminated, then carded, laid, and then reinforced and fibrillated by multiple passes of water needle puncture to produce a water needle punctured fiber assembly. The fiber assembly produced is then dried, wound, slitted, and punched to produce a fiber assembly material for an atomizing heating core. In the multiple water needle puncture process, the maximum water needle puncture pressure is 400 bar, the microfibrillation level of the fibers in the fiber assembly reaches level 4, the fiber assembly has a grammage of 200 g / m 2 , a thickness of 0.8 mm, an oil content of 0.01%, and the remaining physical property parameters are shown in Table 1.

[0089] Example 4

[0090] Lyocell cellulose fibers with a decomposition point of 160°C and a fiber length of 38 mm are opened, cleaned, then carded, laid, and then reinforced and fibrillated by multi-pass water needle puncturing to produce a water needle punctured fiber assembly. The fiber assembly produced is dried, wound, slitted, and punched to produce a fiber assembly material for an atomizing heating core. In the multi-pass water needle puncturing process, the maximum water needle puncturing pressure is 200 bar, the microfibrillation level of the fibers in the fiber assembly reaches level 2, the fiber assembly has a grammage of 70 g / m 2 , a thickness of 0.3 mm, an oil content of 0.01%, and the remaining physical property parameters are shown in Table 1.

[0091] Example 5

[0092] Lyocell cellulose fibers with a decomposition point of 160°C and a fiber length of 38 mm are opened, cleaned, then carded, laid, and then reinforced and fibrillated by multi-pass water needle puncturing to produce a water needle punctured fiber assembly. The fiber assembly produced is dried, wound, slitted, and punched to produce a fiber assembly material for an atomizing heating core. In the multi-pass water needle puncturing process, the maximum water needle puncturing pressure is 200 bar, the microfibrillation level of the fibers in the fiber assembly reaches level 2, the fiber assembly has a grammage of 400 g / m 2 , a thickness of 2.5 mm, an oil content of 0.01%, and the remaining physical property parameters are shown in Table 1.

[0093] Example 6

[0094] Lyocell cellulose fibers with a decomposition point of 160°C and a fiber length of 38 mm are opened, cleaned, then carded, laid, and then reinforced and fibrillated by multi-pass water needle puncturing to produce a water needle punctured fiber assembly. The fiber assembly produced is dried, wound, slitted, and punched to produce a fiber assembly material for an atomizing heating core. In the multi-pass water needle puncturing process, the maximum water needle puncturing pressure is 200 bar, the microfibrillation level of the fibers in the fiber assembly reaches level 2, the fiber assembly has a grammage of 200 g / m 2 , a thickness of 0.8 mm, an oil content of 0.00%, and the remaining physical property parameters are shown in Table 1.

[0095] Example 7

[0096] Lyocell cellulose fibers with a decomposition point of 160°C and a fiber length of 38 mm are opened, cleaned, then carded, laid, and then reinforced and fibrillated by multi-pass water needle puncture to produce a water needle puncture fiber assembly. The fiber assembly produced is dried, wound, slitted, and punched to produce a fiber assembly material for an atomizing heating core. In the multi-pass water needle puncture process, the maximum water needle puncture pressure is 200 bar, the microfibrillation level of the fibers in the fiber assembly reaches level 2, the fiber assembly has a grammage of 200 g / m 2 , a thickness of 0.8 mm, an oil content of 0.05%, and the remaining physical property parameters are shown in Table 1.

[0097] Example 8

[0098] Lyocell cellulose fibers with a decomposition point of 140°C and a fiber length of 38 mm are opened, cleaned, then carded, laid, and then reinforced and fibrillated by multi-pass water needle puncture to produce a water needle puncture fiber assembly. The fiber assembly produced is dried, wound, slitted, and punched to produce a fiber assembly material for an atomizing heating core. In the multi-pass water needle puncture process, the maximum water needle puncture pressure is 200 bar, the microfibrillation level of the fibers in the fiber assembly reaches level 2, the fiber assembly has a grammage of 200 g / m 2 , a thickness of 0.8 mm, an oil content of 0.01%, and the remaining physical property parameters are shown in Table 1.

[0099] Example 9

[0100] Lyocell cellulose fibers with a decomposition point of 160°C and a fiber length of 38 mm are opened, cleaned, then carded, laid, and then reinforced and fibrillated by multi-pass water needle puncture to produce a water needle puncture fiber assembly. The fiber assembly produced is dried, wound, slitted, and punched to produce a fiber assembly material for an atomizing heating core. In the multi-pass water needle puncture process, the maximum water needle puncture pressure is 200 bar, the microfibrillation level of the fibers in the fiber assembly reaches level 2, the fiber assembly has a grammage of 200 g / m 2 , a thickness of 0.8 mm, an oil content of 0.01%, and the remaining physical property parameters are shown in Table 2.

[0101] Example 10

[0102] The Lyocell cellulose fiber with a decomposition point of 160°C and a fiber length of 38 mm is opened, impurities are removed, then carded, laid, and then reinforced and fibrillated by multi-pass water needle puncture to produce a water needle puncture fiber assembly. The fiber assembly is then dried, wound, slitted, and punched to produce a fiber assembly material for an atomizing heating core. In the multi-pass water needle puncture process, the maximum water needle puncture pressure is 200 bar, the microfibrillation level of the fibers in the fiber assembly reaches level 2, the fiber assembly has a grammage of 200 g / m 2 , a thickness of 0.8 mm, an oil content of 0.01%, and the remaining physical property parameters are shown in Table 2.

[0103] Example 11

[0104] The Lyocell cellulose fiber with a decomposition point of 160°C and a fiber length of 3 mm is wet-laid, and then reinforced and fibrillated by multi-pass water needle puncture to produce a water needle puncture fiber assembly. The fiber assembly is then dried, wound, slitted, and punched to produce a fiber assembly material for an atomizing heating core. In the multi-pass water needle puncture process, the maximum water needle puncture pressure is 200 bar, the microfibrillation level of the fibers in the fiber assembly reaches level 2, the fiber assembly has a grammage of 200 g / m 2 , a thickness of 0.8 mm, an oil content of 0.01%, and the remaining physical property parameters are shown in Table 2.

[0105] Example 12

[0106] The Lyocell cellulose fiber with a decomposition point of 160°C and a fiber length of 51 mm is opened, impurities are removed, then carded, laid, and then reinforced and fibrillated by multi-pass water needle puncture to produce a water needle puncture fiber assembly. The fiber assembly is then dried, wound, slitted, and punched to produce a fiber assembly material for an atomizing heating core. In the multi-pass water needle puncture process, the maximum water needle puncture pressure is 200 bar, the microfibrillation level of the fibers in the fiber assembly reaches level 2, the fiber assembly has a grammage of 200 g / m 2 , a thickness of 0.8 mm, an oil content of 0.01%, and the remaining physical property parameters are shown in Table 2.

[0107] Example 13

[0108] The Lyocell cellulose fiber with a decomposition point of 160°C and a fiber length of 38 mm is subjected to opening, impurity removal, then carding, web laying, and then multi-pass water needle puncture reinforcement and fiber opening to prepare a water needle puncture fiber assembly. The prepared fiber assembly is subjected to drying, winding, slitting, cutting and punching processing to prepare a fiber assembly material for an atomizing heating core. In the multi-pass water needle puncture processing procedure, the maximum water needle puncture pressure is 200 bar, the microfibrillation level of the fibers in the fiber assembly reaches level 2, the fiber assembly has a grammage of 200 g / m 2 , a thickness of 0.8 mm, an oil content of 0.01%, and the remaining physical property parameters are shown in Table 2.

[0109] Example 14

[0110] The Lyocell cellulose fiber with a decomposition point of 160°C and a fiber length of 38 mm is subjected to opening, impurity removal, then carding, web laying, and then multi-pass water needle puncture reinforcement and fiber opening to prepare a water needle puncture fiber assembly. The prepared fiber assembly is subjected to drying, winding, slitting, cutting and punching processing to prepare a fiber assembly material for an atomizing heating core. In the multi-pass water needle puncture processing procedure, the maximum water needle puncture pressure is 200 bar, the microfibrillation level of the fibers in the fiber assembly reaches level 2, the fiber assembly has a grammage of 200 g / m 2 , a thickness of 0.8 mm, an oil content of 0.01%, and the remaining physical property parameters are shown in Table 2.

[0111] Example 15

[0112] The Lyocell cellulose fiber with a decomposition point of 160°C and a fiber length of 38 mm is subjected to opening, impurity removal, then carding, web laying, and then multi-pass water needle puncture reinforcement and fiber opening to prepare a water needle puncture fiber assembly. The prepared fiber assembly is subjected to drying, winding, slitting, cutting and punching processing to prepare a fiber assembly material for an atomizing heating core. In the multi-pass water needle puncture processing procedure, the maximum water needle puncture pressure is 200 bar, the microfibrillation level of the fibers in the fiber assembly reaches level 2, the fiber assembly has a grammage of 200 g / m 2 , a thickness of 0.8 mm, an oil content of 0.01%, and the remaining physical property parameters are shown in Table 2.

[0113] Example 16

[0114] The non-woven fabric special cotton cellulose fiber is opened, impurities are removed, then carding, web laying, and then multi-channel pressure water needle puncture reinforcement and fiber opening are carried out to prepare a water needle puncture fiber assembly, and then the prepared fiber assembly is dried, wound, cut, and punched to prepare a fiber assembly material for the atomizing heating core of the present application; in the multi-channel water needle puncture process, the maximum water needle puncture pressure is 200 bar, the micro-fibrillation level of the fiber in the fiber assembly reaches level 2, and the fiber assembly has a grammage of 250 g / m 2 , and a thickness of 1.5 mm.

[0115] Example 17

[0116] The non-woven fabric special cotton cellulose fiber is opened, impurities are removed, then carding, web laying, and then multi-channel pressure water needle puncture reinforcement and fiber opening are carried out to prepare a water needle puncture fiber assembly, and then the prepared fiber assembly is dried, wound, cut, and punched to prepare a fiber assembly material for the atomizing heating core of the present application; in the multi-channel water needle puncture process, the maximum water needle puncture pressure is 200 bar, the micro-fibrillation level of the fiber in the fiber assembly reaches level 2, and the fiber assembly has a grammage of 250 g / m 2 , and a thickness of 1.5 mm.

[0117] Comparative Example 1

[0118] The polyester fiber with a fiber length of 38 mm is opened, impurities are removed, then carding, web laying, and then multi-channel pressure water needle puncture reinforcement and fiber opening are carried out to prepare a water needle puncture fiber assembly, and then the prepared fiber assembly is dried, wound, cut, and punched to prepare a fiber assembly material for the atomizing heating core of the present application; in the multi-channel water needle puncture process, the maximum water needle puncture pressure is 200 bar, but the fiber cannot be micro-fibrillated, the fiber assembly has a grammage of 200 g / m 2 , a thickness of 0.8 mm, an oil content of 0.01%, and the remaining physical property parameters are shown in Table 3.

[0119] Comparative Example 2

[0120] The lyocell cellulose fiber with a decomposition point of 160°C and a fiber length of 38 mm is opened, impurities are removed, then carding, web laying, and then multi-channel pressure water needle puncture reinforcement and fiber opening are carried out to prepare a water needle puncture fiber assembly, and then the prepared fiber assembly is dried, wound, cut, and punched to prepare a fiber assembly material for the atomizing heating core of the present application; in the multi-channel water needle puncture process, the maximum water needle puncture pressure is 500 bar, the micro-fibrillation level of the fiber in the fiber assembly reaches level 5, and the fiber assembly has a grammage of 200 g / m 2 , a thickness of 0.8 mm, an oil content of 0.01%, and the remaining physical property parameters are shown in Table 3.

[0121] Comparative Example 3

[0122] Lyocell cellulose fibers with a decomposition point of 160°C and a fiber length of 38 mm were opened, cleaned, then carded, laid, and then reinforced and fibrillated by multiple passes of water needle puncture to produce a water needle punctured fiber assembly. The fiber assembly produced was then dried, wound, slitted, and punched to produce a fiber assembly material for an atomizing heating core; in the multiple passes of water needle puncture, the maximum water needle puncture pressure was 200 bar, the microfibrillation level of the fibers in the fiber assembly reached level 2, the fiber assembly had a grammage of 200 g / m 2 , a thickness of 0.8 mm, an oil content of 1.00%, and the remaining physical property parameters are shown in Table 3.

[0123] Table 1

[0124]

[0125] Table 2

[0126]

[0127] Table 3

[0128]

[0129] According to the above table,

[0130] (1) As can be seen from Example 1 and Example 2, under the same conditions, the microfibrillation level of the former is within a more preferred range, and the obtained fiber assembly has a better taste.

[0131] (2) As can be seen from Example 1 and Example 3, under the same conditions, the microfibrillation level of the former is within a more preferred range, and the obtained fiber assembly has a longer service life.

[0132] (3) As can be seen from Example 1 and Example 4, under the same conditions, the thickness of the fiber assembly of the former is within a more preferred range, and the obtained fiber assembly has a better taste and a longer service life.

[0133] (4) As can be seen from Example 1 and Example 5, under the same conditions, the thickness of the fiber assembly of the former is within a more preferred range, and the obtained fiber assembly has a better taste and a longer service life.

[0134] (5) As can be seen from Example 1 and Example 7, under the same conditions, the oil content of the fiber assembly of the former is within a more preferred range, and the obtained fiber assembly has a better taste.

[0135] (6) From Example 1 and Example 8, under the same conditions, the fiber decomposition point of the former is within the preferred range, and the obtained fiber assembly has good taste and long life.

[0136] (7) From Example 1 and Example 9, under the same conditions, the specific heat capacity of the fiber of the former is within the preferred range, and the obtained fiber assembly has better taste.

[0137] (8) From Example 1 and Example 10, under the same conditions, the specific heat capacity of the fiber of the former is within the preferred range, and the obtained fiber assembly has better taste.

[0138] (9) From Example 1 and Example 13, under the same conditions, the specific resistance of the fiber of the former is within the preferred range, and the obtained fiber assembly has good taste.

[0139] (10) From Example 1 and Example 14, under the same conditions, the specific resistance of the fiber of the former is within the preferred range, and the obtained fiber assembly has good taste.

[0140] (11) From Example 1 and Example 15, under the same conditions, the limiting oxygen index of the fiber of the former is within the preferred range, and the obtained fiber assembly has long life.

[0141] (12) From Example 1 and Comparative Example 1, under the same conditions, the former is cellulose fiber, compared with synthetic fiber, the obtained fiber assembly has good taste and long life.

[0142] (13) From Example 1 and Comparative Example 2, under the same conditions, the fiber of the former has better microfibrillation, compared with Comparative Example 2, the obtained fiber assembly has good taste and long life.

[0143] (14) From Example 1 and Comparative Example 3, under the same conditions, the fiber of the former has less oil, compared with Comparative Example 3, the obtained fiber assembly has good taste.

Claims

1. A fiber assembly for an atomizing heating core, characterized in that... The fibers constituting the fiber aggregate are cellulose fibers, and the basis weight of the fiber aggregate is between 200 and 300 g / m³. 2 The thickness ranges from 0.3 to 2.5 mm, the oil content of the fiber aggregate ranges from 0.00 to 0.50%, the length of the cellulose fibers ranges from 38 to 51 mm, and the microfibrillation grade of the cellulose fibers ranges from 1 to 4. Based on the degree of microfibrillation on the surface of the cellulose fibers, the microfibrillation grade of cellulose fibers can be divided into the following grades: Grade 0: No microfibrils on the fiber; Grade 1: The fiber contains only a small amount of fine microfibrils; Grade 2: The fibers contain a large number of microfibrils; Grade 3: The fiber contains a relatively large number of long microfibrils; Grade 4: The fibers contain a large number of long microfibrils and have become crimped; Grade 5: The fibers contain a large number of long microfibrils that are intertwined with each other; Grade 6: The main fiber structure is split, with a large number of long microfibrils that are intertwined.

2. The fiber assembly for atomizing heating core according to claim 1, characterized in that... The decomposition point of the cellulose fibers is between 140 and 250°C.

3. The fiber assembly for atomizing heating core according to claim 1, characterized in that... The specific heat capacity of the cellulose fiber is 1.0 to 2.0 J / (g·℃).

4. The fiber assembly for atomizing heating core according to claim 1, characterized in that... The resistivity of the cellulose fiber is 10. 6 ~10 9 Ωg / cm 2 .

5. The fiber assembly for atomizing heating core according to claim 1, characterized in that... The dielectric constant of the cellulose fiber is between 2 and 15 F / m.

6. The fiber assembly for atomizing heating core according to claim 1, characterized in that... The limiting oxygen index of the fiber aggregates is between 19 and 45%.

7. A method for preparing a fiber assembly for an atomizing heating core as described in any one of claims 1 to 6, characterized in that... The following processing steps are included: (1) opening, removing impurities and mixing cotton with one or more specifications of cellulose fibers; (2) after carding, web laying or wet web forming; (3) performing multiple ultra-high pressure water needle puncture processes with a pressure of 100 bar to 400 bar, so that the fibers become entangled and the cellulose fibers become microfibrillated; (4) finally drying, winding, slitting and cutting the fiber assembly to make a fiber assembly for atomizing heating core.

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