One subject of interest is “grey” flue - cured tobacco. Despitemany studies from different countries,there is no conclusive,unifiedanswer. Among the factors suspected to be associated with “grey” tobacco,are: soil pH,organic matter,maturity at harvesting,...[继续阅读]

    The evolution of cigarette filters can be traced through severalstages. The first step was probably the use of special tipping papers tokeep the cigarette from adhering to a moist lip. These papers were usually printed to simulate a wooden or cork appeara...[继续阅读]

    Numerous studies involving tobacco as a “biofactory” have been initiated where this solanaceous plant has been used as the recipient of genesthat encode protein products of commercial value.In work reported by Hiatt et al. ,the γ-and κ-chain cDNAs wereclo...[继续阅读]

    A schematic flow diagram for a typical U. S. blended cigarettemanufacturing process is shown in Figure 7. Whole Oriental leaf requiresonly cleaning of dirt,sand,and fines to be ready for blending. Burleyand Maryland tobaccos are combined,dip-cased,dried,a...[继续阅读]

    Certain chemical index,for example,petroleum ether extract(PEE),is often used as an indicator of leaf desirability,although theexact components of this fraction are not completely defined,nor are itscombustion products. A few studies are listed herein ill...[继续阅读]

    Tobacco quality represents a balance of essential properties in aproduct which meets the preference of a special group of consumers at agiven time and location. Quality therefore may be considered as desirability or usability. Many essential chemical and ...[继续阅读]

    Only 60%～65% of the weight of tobacco bought at auction finds itsway into shred in the final cigarette product. By far the largest by-product is the stem or mid-rib that held the leaf to the plant stalk. The stemmakes up 20%～25% of the leaf weight (Table ...[继续阅读]

    Description and purpose of componentsThe typical blended cigarette in the United States is a filter cigaretteof 85mm or 100mm total length with a diameter of about 8 mm. On an85mm cigarette,the cellulose acetate tow filter usually constitutes 20～25mm of t...[继续阅读]

    One extensive study of the effect of filter ventilation on smoke component deliveries has been published. The tips used ranged in level ofventilation from 20% to 70%. It was shown that the level of ventilationremained essentially constant through the smok...[继续阅读]

    The origin of N. tabacum has been a challenging problem for manyplant scientists. Although it is now the most commonly grown commercialtobacco species,N. tabacum does not occur naturally in the wild state.One hypothesis is that N. tabacum arose from an in...[继续阅读]