Types
Generally, ECON's underwater pelletizers are offered in combination with the water treatment and drying system (EWT).
Function
The vibration drying system consists of two or three sequentially arranged
vibrating screens. The first stage serves for dewatering the pellets. In a
dehydrator, the pellets are separated from the process water before they enter
the screen. The process water is cleaned by an automatic band filter and
recirculated to the process.
In the second stage, the pellets undergo further drying. Electrical damping
registers are installed under the vibrating screen to generate a warm stream of
air through the screens.
An additional stage can be installed to treat highly hydroscopic materials with
even more stringent requirements for residual humidity.
Types
The ECON vibration drying system is suitable for throughputs up to 3,000 kg/hr.
Function
The air pelletizing system consits of a pelletizing unit, a conveyor fan with
noise reduction cover, piping and a cyclone and an electrical control system.
The melt is directed to the pelletizing head with the die plate installed, and
the emerging melt strands are pelletized.. The pellets are moved by an air
stream that is produced by the conveyor fan. By the air stream the pellets are
dried and are discharged through the cyclone.
Function
The granules/water mixture is supplied to the drying chamber through the inlet
case, which is incorporated as a sieve in the bottom. The granules are collected
in the drying chamber by a rotor equipped with blades and are spirally conveyed
upward through the sieve basket. The water is collected by bouncing and rolling
the granules frequently on the sieve basket. The dried product leaves the dryer
in the airflow through the tangentially arranged nozzle on the dryer top cover.
The water outflow takes place through an outlet in the bottom of the housing or
in the housing side.
Function
To change the screens the machine has to be stopped. The piston carrying the
screen is moved out hydraulically and the screen can be exchanged.
Types
The discontinuous screen changers are appropriate for throughputs from only a
few kg/hr up to 2,500 kg/hr.
Function
The piston in the backflush unit redirects the melt flow, so only one piston
with screens is currently being used in the production process. The other screen
pack is flushed backwards, so any contaminants with only minimal melt are
removed from the screens through the backflush unit. Afterwards the process is
repeated with the other screen pack.