SBR Banbury Mixing
SBR Banbury Mixing
(OP)
I'm mixing a very basic SBR compound on our 270 liter Banbury mixer. The compound has carbon black, the standard small powders, some synthetic resin for tack and no oil. It really is a basic formulation. But I'm having an issue with the compound discharging from the mixer in pieces rather than as one single mass, which is always the ideal scenario for reduced milling time. I tried single stage initially but ended up switching to two-stage to allow higher temperatures. I have tried various fill factors, different mix steps, different order of loading and different rotor speeds on discharge - all to no avail. Has anyone any tips on improving this?





RE: SBR Banbury Mixing
RE: SBR Banbury Mixing
RE: SBR Banbury Mixing
forumtowers.com
RE: SBR Banbury Mixing
RE: SBR Banbury Mixing
1. Water temperature 40°C
2. Rotor speed 50 rpm
3. Add SBR, ram down. Mix for 60secs.
4. Add ½ carbon black, ram down. Mix for 45 secs.
5. Add rest of black, ram down. Mix for 45 secs.
6. Add rest (but NOT accelerators or sulfur), ram down. Mix to indicated 165-170°C.
7. Dump masterbatch.
forumtowers.com
RE: SBR Banbury Mixing
RE: SBR Banbury Mixing
forumtowers.com