Method for removing adherent or immigrated olfactory substances from thermoplastic particles and treatment device therefor

A method for removing adherent or immigrated olfactory substances from thermoplastic particles that are present as bulk material and that are acted on by dry, warm air in a treatment chamber of a warm air container during a time period t2, the method comprising:

• warming, before the treatment in the warm air container, the plastic particles in at least one infrared rotary tube, the infrared rotary tube having at least one infrared emitter that is arranged in a central region of the interior space thereof and directed toward an inner wall of the drum thereof;
• rotating continuously the drum, during a time period t1, while the plastic particles are warmed, and subsequently transferring the plastic particles in the warm state, with a maximum temperature loss of 20 K, into the treatment chamber of the warm air container, where the plastic particles continue to be acted on by warm air during the time period t2;
• and
• aftertreating over a third time period t3, after the treatment in the warm air container, the bulk material in a conveying device that extends from the bottom upwards;
• and
• discharging the bulk material.