Conventional Flights

Astec, Inc. was awarded patent number 8,863,404 for its V-Pack™ Stack Temperature Control System in October 2014.

Astec’s V-Pack Stack Temperature Control System extends the range of mixes that can be produced without requiring that the flights be adjusted. The system’s “V-flights,” unique drum flights with a deep V-shape, and its use of variable frequency drives (VFDs), which provide control of the drum rotational speed, are keys to the control system managing an asphalt plant’s exhaust gas temperature and increasing overall efficiency.

Astec’s V-Pack Stack Temperature Control System uses the V-flights to produce a uniform veil of virgin aggregate across the entire drum, regardless of how full the drum is, the plant’s production rate, or the RAP percentage used. This is what enables drum speed changes to be effective as a means of controlling stack temperature. Since the V-flights shower uniformly without regard to how much material is in them, they never leave a hole in the veil.