Complex type dryer for high viscous materials

A complex type dryer comprising:

• a rotational cylinder;
• a drying material provider disposed over the rotational cylinder and coating a drying material on a surface of the rotational cylinder;
• a hot air provider connected to both sides of the rotational cylinder, and comprising first and second hot air tubes, the first and second hot air tubes alternately providing a hot air into the rotational cylinder or alternately exhausting the hot air passing through the rotational cylinder;
• a hot air chamber disposed along an outer surface of the rotational cylinder outside of the rotational cylinder, the hot air which is re-provided after passing through the rotational cylinder passing through the hot air chamber;
• a scraping unit disposed at a side of the rotational cylinder, and removing the drying material from the surface of the rotational cylinder after dried by the rotational cylinder and the hot air chamber;
• and
• a connecting part receiving the hot air passing through the rotational cylinder and re-providing the heat to the hot air chamber,
• wherein the hot air is sequentially provided to the first hot air tube, the rotational cylinder, the second hot air tube, the connecting part and the hot air chamber, which is a first path, or the hot air is sequentially provided to the second hot air tube, the rotational cylinder, the first hot air tube, the connecting part and the hot air chamber, which is a second path.