Step 4 - Finishing (Calendering & QC Testing)
 Calendering
Filter cloth is stabilized in preheating machinery. Final surface finishing and permeability is achieved with high speed calenders - heated, polished, steel rolls - which press the fabric making the surface smooth and compact and further "set" the cloth.

QC Testing
Accurate permeability readings are taken "on the fly" during the finishing process as the fabric feeds through the calender stack. The jumbo rolls finally processed in inspection and re rolled into 100 yard packages. A laboratory analysis is made of each roll, including weight, thread count and permeability and the roll is ticketed with an individual serial number and released to our warehouse.

Singering and PTFE membrance treatment

Heat setting