North American Cold Mills

Roll Coolant-Emulsion

Roll coolants filtered by BOLLFILTER

Imperfection issues in cold mills

Quality has been an on-going issue for cold mill operators and production teams. Pockmarks and surface imperfections are notorious causes for product downgrading and/or total rejection. Real values placed on these shortfalls attribute to high costs of product and operational expense.

Filtration as solution for reduction of product rejection

Automatic filters are proven effective solutions for the reduction of product rejection and/or downgrading. Especially, when positioned at the most critical final roll stand, the BOLLFILTER Automatic Type 6.19 has an almost immediate pay-back through return on investment.  Specially developed, roll bonded filter elements have proven to directly retain particles attributed to surface imperfections. Not only are the particles retained and eliminated from delivery to the roll bite area, but these same particles are easily eliminated from the system through backwashing. The highly efficient backwash technology, enhanced with steam assist, through bi-direction crossflow and reverse flushing quickly and easily rid the system of detrimental debris.


Peripheral benefits aside from enhanced quality are:

  • Less frequent roll changes
  • Tramp oil reduction
  • Prolonged emulsion life without need for periodic dumps
  • Scums, soaps and iron fines are controlled
  • Options for backwash recovery – zero discharge
  • Less plugging & extended spray nozzle life

Clients / Users
  • Numerous steel producers
Systems in use
  • BOLLFILTER Automatic Type 6.19