261results about How to "Improve smoking quality" patented technology

The invention discloses an extraction method of cactus polysaccharide, which is characterized by comprising the following steps: high temperature enzyme inactivation; drying and crushing; extraction, centrifugal separation and filtration; filtrate concentration, adding into alcohol, precipitation, and crude cactus polysaccharide collection; dissolving of the crude cactus polysaccharide and purification; and obtaining of the cactus polysaccharide after collecting, washing and vacuum drying the precipitation. The cactus polysaccharide is applied to tobacco threads along with feed liquid after being dissolved with water, therefore, the smoke has no peculiar smell when a person smokes, the cactus polysaccharide can improve quality of aroma, mellow degree and sweet taste, improve oral comfort, reduce unpleasant smell and irritation, improve the dry sensation to a certain degree and obviously improve the moisturizing performance. The cactus polysaccharide does not change the original properties and the original processing technology of cigarettes, and does not change or influence the smoking quality of the cigarettes, thus having practical production significance and value.

The invention relates to a preparation method of a tobacco perfuming agent prepared through molecular distillation treatment of extractum obtained through the Maillard reaction from inferior tobacco leaves. The preparation method comprises the following steps: (1) smashing the inferior tobacco leaves, mixing the smashed inferior tobacco leaves with water and stirring the mixture; (2) treating the mixture with compound enzyme for hours, and conducting enzyme deactivation; (3) adding auxiliary materials comprising Chinese jujube powder, smoked plum, powder of seed of wild jujube and licorice, and conducting the Maillard reaction; (4) extracting with ethanol, filtering, and conducting vacuum concentration at 50-60 DEG C on the filtrate to obtain a tobacco extractum; (5) conducting molecular distillation and separation on the extractum to obtain a light component and a heavy component of essential oil of the tobacco perfuming substance. The preparation method disclosed by the invention is to reuse the inferior tobacco leaves to obtain the product with high value-added, bring about new economic benefit for enterprises, and further promote the smoking quality for the cigarette.

The invention discloses a fruit flavor for cigarettes and application of the flavor. The fruit flavor for cigarettes is prepared by naturally fermenting, filtering, centrifuging, and freeze-drying edible fruits and sugar as raw materials. The fruit flavor is rich in active enzyme, reducing sugar, amino acid, vitamin, trace elements and minerals and the like and can be used in tobacco leaf or shredded stem feeding process. The fruit flavor for cigarettes is simple to manufacture, safe and environmentally friendly and has good application prospects; by the fruit flavor, the internal quality of the cigarettes can be significantly improved.

The invention belongs to the technical field of tobacco flavors, and particularly relates to tobacco extract, and an extraction method and application thereof. The tobacco extract is obtained from tobacco stalk bast by extracting. By the method, agricultural tobacco waste is changed into wealth, so that resources are fully utilized. Feasibility and controllability of industrial production are fully considered in the design of preparation technique roadmaps, the obtained extract is purely natural tobacco homologous perfume and has great market potential. The tobacco extract is convenient in application and convenient to obtain by existing cigarette processing technology, and smoking quality of cigarettes can be improved distinctly.

The invention relates to a tea flower extract composition and its use in a cigarette. The tea flower extract composition comprises iron mercy goddess tea flower extract, robe tea flower extract, cassia tea flower extract and narcissus tea flower extract. The tea flower extract composition is added into the cigarette so that the cigarette has a harmonious fragrance. The tea flower extract composition can improve fullness of a cigarette fragrance and volatility of a cigarette fragrance without change of original cigarette performances and original cigarette processing processes. The tea flower extract composition has a sweet taste, promotes secretion of saliva of a smoker, improves miscellaneous gas and irritation and improves integral smoking quality.

The invention provides tea flower essence with fresh and sweet characteristics, and application of the essence in cigarettes. The tea flower essence with fresh and sweet characteristics is prepared by the following steps: using a tea flower extract as primary flavor and a certain amount of a coordination agent, a modifier, a fixative and a diluent as auxiliary materials, and performing compatibility research to determine the ratio of each component so as to prepare the tea flower essence applied to the cigarettes. The tea flower essence provided by the invention has prominent fresh and sweet taste and has durable and stable fragrance. After the tea flower essence is added to the cigarettes, the fresh and sweet characteristics are given to the cigarettes, the fresh and sweet taste in the cigarette fragrance is obviously increased, and the smoking quality and the sensory comfort of the cigarettes are obviously improved.

The invention provides a method for extracting polysaccharides from morinda root and the application of the polysaccharides in cigarettes. The method for extracting the polysaccharides comprises the steps as follows: morinda root is dried, and pulverized into powder of 10 to 100 meshes; the morinda root powder is immersed and extracted by adding water at 50 to 100 DEG C; subsequently, the mixture of the morinda root powder and water is filtered and the filtrate is concentrated; the concentrated filtrate is added to ethanol to ensure the ethanol to account for 80 percent in volume; the mixture of the concentrated filtrate and the ethanol are allowed to be settled out and filtered, thus getting the raw polysaccharides; the raw polysaccharides are put in water for redissolution; a sevag reagent 0.1 to 1 time of the raw polysaccharide solution in volume is added, and is shaken and allowed to be separated into layers; the mixture of the thick sevag and protein on the lower layer is removed; the pH value is adjusted to 9 to 10 with ammonia; oxydol 30 percent of the solution in mass is added slowly until the solution is turned into straw yellow; after the solution is decolored, the solution is condensed before ethanol with the concentration from 95 to 100 percent is added, the volume percentage of the ethanol is kept to be 80 percent; the solution is allowed to be settled out for 24 to 48 hours, thus getting the polysaccharides from morinda root through filtration.

The invention belongs to the field of flavors and fragrances and particularly relates to tea flower essence with a fruity flavor characteristic and an application thereof to cigarettes. The tea flower essence comprises body note 1, bottom note, top note, body note 2, a fixative and ethyl alcohol. The tea flower essence mainly prepared by natural tea flower extracts is more excellent in fruity flavor note and more lasting and stable in fragrance. The fruity flavor note in cigarette fragrance is increased obviously and the smoking quality and the sensory comfort degree of the cigarettes are improved remarkably after the tea flower essence is added to the cigarettes.

The invention provides a composition and application of the composition in cigarettes and particularly provides a composition. The composition contains a main flavor enhancer, a coordination agent, a modifier and a fixative, wherein the main flavor enhancer is an extract of a preliminary tea product, the coordination agent is tomato ketone, linalool, geraniol, dihydrogen jasmone, geranyl acetate or any combination thereof, the modifier is caryophyllene oxide, nerolidol, beta-damascenone, megastigmatrienone, beta-ionone, dihydro kiwifruit lactone or any combination thereof, and the fixative is a ladanum extract, a Yunyan tobacco extract or a combination thereof. The composition has an elegant and natural aroma, is fresh and fragrant, has a sweet, fragrant and graceful smell and can be widely used in the fields of tobaccos, foods and daily chemicals and the like.

The invention relates to a camellia extract composition with spicy fragrance and application of the composition serving as a cigarette additive to cigarettes. The camellia extract composition is prepared from camellia extract and spice. After the camellia extract composition with the spicy fragrance is added into the cigarettes, fragrance of the cigarettes is harmonious, unique fragrance of the cigarettes is enhanced, the spicy fragrance is enhanced, cigarette flavor is enabled to be richer and more natural, richness, sense of thickness and mellowness of the cigarette fragrance are improved, smokers smoking the cigarettes can feel nature and relaxed, offensive odor and stimulation are reduced, and overall smoking quality is improved.

The invention relates to a preparation method of asparagus rough polysaccharide, including the following steps: a, asparagus is subject to prophase treatment and then is baked and smashed; b, water is added and extraction is carried out; c, separation, filtration and concentration are carried out; d, ethanol is added into concentrated solution, standing and filtering are carried out, and flocculent precipitate is dried, so as to obtain the asparagus rough polysaccharide. The asparagus rough polysaccharide is dissolved and then sprayed onto cigarette shred, cigarette smoke has no objectional odour, offensive taste and thrill are reduced, back to the sweet feeling and oral cavity comfort are improved, and entire smoking quality is improved. The invention does not change the original performance of cigarette, dose not change the original cigarette processing technology, overcomes the quality defects that cigarette moisturizing performance is poor, flue gas is dry and comfort is poor in national cigarette products and improves cigarette smoking quality, thus having significance and value of actual production.

The invention discloses an extraction method of tremella polysaccharide and an application of the tremella polysaccharide in tobaccos. The method comprises the following steps of: a. after pre-processing tremella, drying the tremella at 30-80 DEG C and then grinding the tremella to 40-100 meshes; b. soaking the tremella powder in 80-100% ethanol for 1-24 hours; c. extracting the tremella powder with water for 1-4 hours at 50-100 DEG C; d. concentrating the filtrate obtained after filtration; and e. adding the concentrate to absolute ethyl alcohol to a scale, carrying out static precipitation for more than 24 hours and obtaining the tremella polysaccharide after filtration. The extraction method has the following beneficial effects that the tremella polysaccharide is added to cut tobaccos as feed liquid for tobaccos, so when the cigarettes burn, the smoking quality of the cigarettes can be obviously improved, the aroma quantity is increased, the irritation and the dry sensation are reduced and the taste is improved; the tremella polysaccharide also has a certain moisture preserving function and can reduce the contents of such harmful components in the main stream smoke of the cigarettes as free radicals; and the tremella polysaccharide does not change the original performances of the cigarettes or the existing processing techniques of the cigarettes, so the tremella polysaccharide further has practical production significance and value.

The invention discloses an extracting method of aloe polysaccharides, and the application thereof in cigarettes, wherein, the extracting method comprises the following steps: (1) fresh aloe leaves are crushed, centrifuged and filtered to obtain pure aloe raw juice; (2) after going through the steps of microwave extraction, centrifugal separation and concentration, water is added into alcohol, mixed, rested and filtered and crude aloe polysaccharides is obtained by settlement collection; (3) the filtrate goes through a nanofiltration membrane and an ultrafiltration membrane respectivcely for nanofiltration and ultrafiltration and then is frozen and dried; and (4) after being dissolved by water, the aloe polysaccharides is applied to tobacco shreds during a feeding process in a spraying manner so as to improve the moisturizing effect of the cigarettes; when being smoked, the dry sensation of the cigarettes is reduced, no undesirable odor exists in the smoke and the saliva of smokers is enriched. The extracting method has the obvious advantages that: the smoking quality of the cigarettes is improved; the content of harmful substances in the smoke is reduced; the sweetness and comfort are improved; the effects of enriching saliva and moisturizing are significant; and the application of the technology does not change the processing techniques of the existing cigarettes and has significance and value in the actual production.

The present invention provides a method for regenerating tobacco leaves by loaded tobacco fragments manufactured by a dry papermaking technology, and belongs to the field of a tobacco product machining method. The method comprises the following two steps: step 1, sorting the tobacco fragments and adding the tobacco fragments in a substrate forming process, conveying fibers into a first forming device (1) after plant fibers are deliberated into single fiber shapes, and forming a fiber layer (7) by using an airflow net forming method; and step 2, spraying paste prepared from the tobacco fragments, tobacco powder and an adhesive on the formed substrate, i.e. spraying the paste made of the tobacco fragments, the tobacco powder and the adhesive on one surface of the substrate, drying, then spraying the paste made of the tobacco fragments, the tobacco powder and the adhesive on the other surface of the substrate and drying to obtain the tobacco leaves regenerated by the loaded tobacco fragments manufactured by the dry papermaking technology. By virtue of the method, not only can procedures be reduced, but also powder-falling and dust-raising phenomena caused by excessive tobacco powder are reduced, the use amount of the adhesive is also reduced and the smoking quality is improved.

The invention relates to separation of critical phenols and weak acidic trace aromatic components in cigarette mainstream smoke, especially separation method of trace aromatic components from large amount of harmful components. The invention takes unblended cigarette of high-quality tobacco leaf as material. Collected smoke particulate phase condensate is subjected to steps of extraction, acid washing, alkali washing, vacuum concentrating, normal phase liquid phase chromatographic separation, etc., to give six elution fractions F1-F6, which are subjected to gas chromatography-mass spectrometry (GC-MS) analysis in combination with sensory evaluation, to select elution fraction F4 with obvious sensory effect. Through further preparative liquid phase chromatography separation method and combination of chemical analysis and sensory evaluation, separation and purification are further performed to enrich aromatic fraction, finally weak acidic aromatic component SF14 is screened. The inventive separation method removes large amount of components without contribution to cigarette aroma, enriches trace beneficial aromatic components, uses them in flavoring field of tobacco shred or filter tip, and is necessary for improving smoking quality of cigarette.

The invention discloses extraction for active ingredients of cordyceps sinensis and application thereof in a cigarette filter, and relates to a method for extracting the active ingredients of the cordyceps sinensis from the active ingredients and adding the active ingredients into the cigarette filter. The method comprises the following steps of: after pre-treating and crushing the cordyceps sinensis, heating and refluxing the crushed cordyceps sinensis with water or ethanol; and concentrating, filtering and separating by column chromatography to obtain the active ingredients. The active ingredients of the cordyceps sinensis are added into materials for making the cigarette filter in proportion; and the cigarette filter is made by using the materials. After adopting the technology, the smoking quality of cigarettes can be improved, the release amount of certain harmful components in the mainstream smoke of the cigarettes can be reduced, the active ingredients of the cordyceps sinensis can be transferred into the mainstream smoke, and the effects of promoting the production of body fluid, wetting whistle, eliminating phlegm, reducing stimulus and the like are achieved without any side effect.

The invention relates to a tobacco sheet containing tea flower extractive and a preparation method thereof. The tobacco sheet is made of tobacco raw materials by a papermaking method. the preparation method is characterized in that tea flowers are added in tobacco sheets during the preparation method, the tea flowers are best to be dried tea flowers, tea flower extractives or residue after tea flowers are extracted, and the tobacco raw materials are cigarette ashes, tobacco debris, tobacco stem, low-level tobacco and the combination. The tobacco sheets smell like tea flowers, has effective combination of tea flower smell and tobacco smell, has good smoking quality and sense comfort level and has sweet feeling in mouth during smoking, raw materials are natural, additive process is simple, the existing process procedures do not needed to change and auxiliary equipment is not needed to add.

The invention discloses a preparation method of undaria pinnatifida rough polysaccharide, mainly comprising the following steps: a. drying and smashing pretreated undaria pinnatifida; b. taking a certain quantity of the undaria pinnatifida dry powder, and adding water fro extracting so as to obtain an undaria pinnatifida water extract; c. centrifuging, filtering and concentrating the extract; and d. adding ethanol into the concentrated solution, standing, filtering, and drying flocculent precipitate to obtain the undaria pinnatifida rough polysaccharide. The rough polysaccharide of the invention is dissolved with water to prepare feed liquid with different concentrations and is evenly sprayed on tobacco shreds according to 0.001-0.05 wt% of the tobacco shreds; sensing evaluation results show that after charged, cigarette smoke has no peculiar smell; the offensive taste and the pungency of the cigarette smoke are slightly lowered, after-sweet taste increases, quality of aroma is improved, aroma density is increased, and the smoking quality of the cigarette is improved, thus the invention has more practical production meanings and value and the application of the technology does not change the existing processing technic of the cigarette.

The invention discloses a natural apple essence and a preparation method thereof. The natural apple essence is prepared by carrying out blending modification on apple concentrate. The preparation method of the natural apple essence comprises the following steps of: (1) carrying out inspection, washing and crushing on raw material apples, then juicing, filtering juice to obtain supernatant, and concentrating the supernatant to the relative density of 1.050 to 1.250 by a vacuum concentration device to obtain the apple concentrate; and (2) carrying out blending modification on the apple concentrate. Not only does the preparation method of the natural apple essence, which is disclosed by the invention, overcome the defect of large using amount of a compound in a cigarette essence in the prior art, but also the natural apple essence prepared by the method has stronger natural taste, is purer, has excellent effect, can be coordinated with the fragrant of cigarettes, improves the smoking quality of the cigarettes and has an obvious effect of improving the smoking quality of the cigarettes.

The invention relates to a vanilla and chocolate essence and an application of the vanilla and chocolate essence to cigarettes. The vanilla and chocolate essence is prepared from, by weight, 10-22 parts of vanilla essence, 5-12 parts of bean-fragrance essence, 5-8.5 parts of milk-fragrance essence and 3-6 parts of chocolate essence. After the vanilla and chocolate essence is applied to the cigarettes, the effects of enriching cigarette fragrance, improving the smoke state, reducing mouth cavity residues and reducing irritation can be achieved, then the cigarette fragrance is fine, smooth and flexible, the plumpness and the massiness of the cigarette fragrance are improved, and the smoking quality and the sense comfort of the cigarettes are effectively improved.

The invention discloses a preparation method of a subcritical raisin extract and an application of the subcritical raisin extract in cigarettes. The subcritical raisin extract is characterized by being prepared by the following method: pretreating raw materials and extracting at an extraction pressure of 0.5MPa to 3MPa at the temperature of 0-50 DEG C by taking butane, propane or dimethyl ether as a subcritical extracting solvent, wherein an entrainer used is 55% to 95% ethanol. After being added with the subcritical raisin extract, cigarette shreds are free of peculiar smells in smoke and harmonious in fragrance; due to the subcritical raisin extract, the fragrance quality and the smoke fineness and tenderness of the cigarettes are both improved; the fragrance amount of the cigarettes is increased; impurity gas and irritation of the smoke are reduced; the overall smoking quality of the cigarette is improved. The most prominent characteristics of the subcritical raisin extract prepared by the method disclosed by the invention are that the subcritical raisin extract prepared by the method can be used as a cigarette additive, the application of the additive does not change the original performances and processing technique of the cigarettes, the fragrance quality of the cigarettes is improved and the sensory comfort degree of the cigarettes is increased, so the subcritical raisin extract has better significance and value for actual production.

The invention discloses a preparation method of tobacco leaves of cigars and relates to the technical field of preparation of the tobacco leaves of the cigars by applying the biotechnology. The method comprises the following steps: (1) dissolving 0.01-1L of bacillus cereus microbial liquid with the microbe content of 1.0*10<9>CFU / ml, 0.005-0.020kg of NaCl and 0.001-0.010kg of Tween-80 with purified water till the total volume is 100L; and stirring fully and uniformly to obtain prepared solution; (2) taking 20-50L of the prepared solution and uniformly spraying onto the surfaces of 100Kg of the tobacco leaves of the cigars; and (3) after completing the spraying, placing the tobacco leaves of the cigars into a fermentation room for piling fermentation. During the fermentation process, the temperature is controlled at 30-60 DEG C, the relative humidity is 60-90% and the fermentation time is 30-60 days. Tests prove that, after the treatment, the nicotine irritation and the impact of the cigars are improved and the sensuous quality is obviously improved; compared with the tobacco leaves fermented by the original process, the tobacco leaves fermented by the method provided by the invention has lower nicotine content reduced by 20-30% and lower total nitrogen content reduced by 5-20%.

A smoking article (10) comprises a tobacco rod (12) wrapped with a paper wrapper (14), and a patch (16) of material between the tobacco rod and the paper wrapper that extends along the tobacco rod from or near the mouth end (B) to an intermediate point along the rod. The patch has a structure such that it provides a path for smoke from tobacco upstream of the patch to the mouth end that has less resistance to smoke flow than a path through the tobacco under the patch, thus delivering smoke from the upstream part of the tobacco rod to the smoker more efficiently. The patch may also increase the static burn rate of the latter part of the smoking article.

The invention relates to a preparation method for iron Buddha tea polysaccharide extract and application thereof in tobacco sheets. The method for preparing the iron Buddha tea polysaccharide extract comprises the following steps of: crushing iron Buddha tea leaves, soaking, performing ultrasonic extraction, performing ultrafiltration, performing enzymolysis, precipitating in alcohol, performing centrifugal separation, and preparing the iron Buddha tea polysaccharide extract. The application of the iron Buddha tea polysaccharide extract in a production process for the tobacco sheets can improve the suction quality and the comfort degree of sense organs of the tobacco sheets. The preparation method has the advantages that: the purity of iron Buddha tea polysaccharide is improved by using the ultrafiltration technology, and the problem that protein is difficult to remove in the extraction of common plant polysaccharide is solved safely and effectively by using the enzymolysis technology; and the method is optimized in process, less in loss, high in yield, safe and reliable. When the iron Buddha tea polysaccharide extract is applied in the production of the tobacco sheets, the suction quality and the comfort degree of the sense organs of the tobacco sheets are improved; and the iron Buddha tea polysaccharide extract has the actual production significance and value.

The invention belongs to the technical field of tobacco preparation, in particular to application of a bacillus subtilis xp bacterial strain to degradation of cellulose in tobacco products. The bacillus subtilis xp bacterial strain is currently preserved in the China Center For Type Culture Collection, and a preservation number is CCTCC NO:M 2011452. The bacillus subtilis xp bacterial strain is used for reducing the cellulose content of the tobacco products. In application, the bacillus subtilis xp bacterial strain is made into a bacterial agent, the bacterial agent is uniformly sprayed to surfaces of the tobacco products according to a tobacco product mass ratio of 1.2%, and then storage for mellowing is performed for 40-50d under conditions that the temperature is 30-35DEG C, and humidity is 55-65%. By selection of the specific bacillus subtilis bacterial strain, effectiveness in reduction of the cellulose content of the tobacco products can be proved, tobacco grade is raised, and a tobacco mellowing process is accelerated while mellowing effects are guaranteed.

The invention discloses a compound Chinese medicinal extract capable of improving the influence of cigarette to comfort of larynx. The extract is prepared by mixing the following Chinese medicinal raw materials in parts by weight: unibract fritillary bulb, loquat leaf, ladybell root, poria, pummelo peel, platycodon grandiflorum, prepared pinellia tuber, Chinese magnoliavine fruit, semen trichosanthis, common coltsfoot flower, thinleaf milkwort root-bark, bitter apricot seed, ginger, liquorice, bitter almond water and menthol. The preparation method of the compound Chinese medicinal extract comprises the following steps: screening the Chinese medicinal raw materials; weighing and mixing according to a certain weight proportion; extracting and separating the compound Chinese medicinal mixture with an ethanol solution; and evaluating the effect of the Chinese medicinal extract. The fritillary and loquat compound Chinese medicinal extract in the invention has excellent effect, can be assorted with the original flavor the tobacco, improves the quality of cigarette smoking, and has remarkable effects of reducing stimulation and improving larynx comfort and improving the smoking quality of cigarette and the obvious effect of the cigarette to the comfort of the larynx.

The invention relates to a preparation method of a jujube subcritical extract and an application of the jujube subcritical extract in a cigarette. The method comprises the following steps: a, drying the preprocessed jujube at the temperature of 50 to 80 DEG C, and then pulverizing the dried jujube until the granularity is 10-100 meshes; b, subcritically extracting the jujube powder obtained in the step a for 0.1-2 hours by utilizing the subcritical extracting agent under the condition that the temperature is 0-50 DEG C and the extracting pressure is 0.5-3Mpa, and separating the extract liquid by use of the decompression evaporation principle to obtain the jujube subcritical extract, wherein an ethanol solution is used as a carrier agent, the concentration is 50 to 95 percent, and the consumption of the ethanol solution is 1 to 5 times that of the jujube powder. The jujube subcritical extract is used as cigarette liquid so as to be added into a cigarette tobacco shred, the exclusive chemical component can be generated when the cigarette is burned, so that the quality of the cigarette can be obviously improved. Under the situation that the original performance of the cigarette is not changed, the smoking quality of the cigarette is improved, and the real production significance and value are better.

The invention discloses a method for improving quality of tobacco leaves, which comprises the following steps: (1) pulverizing dregs of tea-oil tree fruit until the particle size is less than or equal to 2mm; (2) ensuring the soil moisture content when ridges are formed, covering a film after rainfall, and digging holes with the depth of 25-35cm at a controlled interval; (3) putting the particles of the dregs of tea-oil tree fruit into the tobacco holes, covering a little soil and mixing evenly to avoid burning the seedling, wherein the dosage of the dregs of tea-oil tree fruit is 15-35kg / mu; and (4) ensuring the soil moisture content when transplanting, and planting the tobacco seedlings into the tobacco holes to complete the process of transplanting flue cured tobacco. When transplanting, if the soil is droughty, sufficient root fixing water is watered to avoid burning the seedling. The invention has good effect, simple operation, environmental protection and low cost.

An oil transporting vaporizer for a smoke generating apparatus to generate smoke to be supplied to a closed system to be tested for leaks. In a preferred embodiment, the vaporizer includes a hollow tube that is manufactured from a high temperature, fire resistant, porous material (e.g., ceramic). The vaporizer stands in a reservoir of oil such that some of the porous tube is filled with oil from the reservoir. A heater wire surrounds the outside of the porous tube above the oil within the tube. A gas (e.g., air) is blown into the porous tube and towards the oil to cause a mixture of air and gas to move through the tube. Because of its porosity, the air / oil mixture permeates the tube in the vicinity of the heater wire so as to be vaporized into smoke when the heater wire is energized.

The invention discloses an economical, portable and efficient grading method for maturity of fresh tobacco leaves of flue-cured tobaccos. The grading method comprises the following steps: evaluating to-be-tested tobacco leaves, wherein the evaluation content comprises visual inspection on botanical characters of the tobacco leaves, and detection on the content of chlorophyll a and carotenoid of the tobacco leaves, if the evaluation result reaches the corresponding index, judging into corresponding maturity grade; and picking up the tobacco leaves of which the maturity grade accords with the requirements according to the individual requirements. According to the method, by combination of the content detection on the chlorophyll a and carotenoid in the tobacco leaves and the visual inspection of the appearance characteristics of the tobacco leaves, a characteristic grading index is provided for the flue-cured tobacco varieties with faint scent tobacco leaf in three southwest tobacco-growing areas of K326, honghua dajinyuan (Chinese character) and Yunnan tobacco 87; grading of the maturity of fresh tobacco leaves is carried out by adopting the method; supply of reasonable choice for scientifically harvesting the ripen tobacco leaves with different varieties and full play of genetic potential of variety and quality are facilitated; the aromatic style of the fainted scent tobacco leaves is strengthened; the smoking quality of the tobacco leaves is improved; and the grading method is especially suitable for popularization and application in the fainted scent tobacco leaf planting areas in the southwest tobacco-growing areas.