Microwave dryer role in tobacco drying
    Microwave is a form of energy , in the dielectric can be converted to heat. Will be able to absorb the microwave energy into high-frequency alternating electric field of materials , the material of the particles will occur repeatedly changed to the movement , resulting in the collision intensified , resulting in consumption of heat ( or Joule heat ) , energy conversion occurs . Therefore, the microwave drying is a dielectric drying , in the dielectric drying process, the material generated internally
Heat and mass transfer driving force is mainly generated within the material quickly vapor pressure gradient . And with hot air , steam heated drying compared to normal , the main advantages of microwave drying , the energy utilization efficiency is high, without damaging the material ( at a lower ambient temperature drying , does not require high surface temperature ) , other volatile substances and the role of the loss is less uniform ( can shape
Into a more uniform distribution of humidity field and humidity ) , rapid drying ( drying time can be reduced by 50 % or more ) , will help improve the quality of silk ( such as avoiding tobacco surface hardening etc. ) . I plant since the installation of the first microwave drying machine, ie, its practical application have been followed , and the results show that the use of microwave drying on tobacco expansion has some effect.
    Application Effect
    A microwave drying machine with a combination of silk machine
    After a process of argumentation and the adoption of microwave equipment manufacturer recommendations , based on our factory optional microwave machine Drying machine with a combination of forms: Cutter - HT - Microwave machine - Drying machine . Reason for using such a combination , because after HT heated humidification silk leaves after microwave drying can provide appropriate incoming swell . In addition, the microwave drying machine with wire feeder connection, can take advantage of the rapid heating function of microwave drying wire feed unit provides heat through a drying machine Drying function allows tobacco to achieve the best drying results .
    2 microwave drying tobacco filler value changes
    Select a different frequency, the same brand of tobacco , by opening the microwave apparatus Drying machines closed after sampling and microwave devices in tobacco drying machine after sampling , the obtained samples were measured, comparing the results . Can be seen in the application of microwave drying system thread , can improve tobacco filler average value 0. 23cm3 / g, an average increase rate of 5.4% , and the tobacco texture made ​​of soft, flexible, tobacco also improved color .
    3 microwave drying after expansion changes in chemical composition of tobacco and smoke
    The comparison of the production line to obtain samples of total sugar , total nitrogen, nicotine and smoke tar, nicotine and other ingredients to the determination . As can be seen , the total sugar tobacco , total nitrogen, nicotine and tar content in the flue gas and nicotine content were decreased . In addition, by comparing the smoking organization to prove after microwave dried tobacco cigarette aroma and smoke flavor without adverse effects.