Screen changer adapter types

Screen changer adapter types include bolt-on adapter, clamp type adaptation, and thread-on ring & bolt-on adapter. They are representative of the most typical ways in which screen changers can be retro-fitted into existing lines.

Screen changer adapter types:
Bolt-on adapter:
This illustrates screen changer retro-fitted to an extruder with a bolt-on type connection:
The screen changer is marked with Balloon. The upstream adapter is bolted to the screen changer and to the barrel flange.
Above the horizontal centerline the adapter is shown with a reduced flow channel through the adapter and into the screen changer body, which transitions to the breaker plate diameter.
Alternatively, below the horizontal centerline, we show the same installation with a screw that extends into the screen changer body. The screw can be smooth or with flights.

Clamp type adaptation:
This illustrates the manner in which screen changer can be retro-fitted to an extruder with a clamp type connection:
The screen changer is marked with Balloon. It is connected to the extruder barrel with the upstream adapter by means of a clamp.
The drawing shows both options with regard to the extruder screw:
a) Above the centerline: in instances where no screw tip extension is added, the upstream adapter is designed with a reduced flow channel to keep polymer inventory to a minimum. The adapter transitions up to the breaker plate diameter in the screen changer body.
b) Below the centerline: we illustrate the preferred method where the existing screw is extended close to the breaker plate. The extension can be smooth or with flights.

Thread-on ring & bolt-on adapter:
In this illustration, the screen changer is marked with balloon. An upstream adapter is bolted to the screen changer’s upstream face. The threaded end of the extruder barrel is fitted with a ring to which the upstream adapter is secured by means of studs and nuts.
The drawing shows both options with regard to the extruder screw:
a) Above the centerline: where no screw tip extension is added, the upstream adapter is designed with a reduced flow passage to keep minimize polymer inventory. The adapter transitions up to the breaker plate diameter in the screen changer body.
b) Below the centerline: the extruder screen is shown in the preferred method where the existing into the screen changer body. The extension can be smooth or with flights.