+44 (0)161 777 9500 | sales@alliedfilter.co.uk Home About Us Products Technical News & Events Contact Us Home » Sewn Needlefelt Filter Bags Sewn Needlefelt Filter Bags Needlefelts are a versatile and cost effective media providing a high solid holding capacity for both non-deformable and deformable, gelatinous particles. By means of a depth filtration mechanism, particles penetrate and are captured throughout the depth of the filter media. They are available in the range of 1 – 200 microns with a nominal (60-70%) efficiency. Polypropylene and polyester are the most widely used, and have a calendered or singed external surface finish to eliminate migration into the filtrate. Manufactured from 100% virgin fibres, the constituent materials have been chosen for their purity, consistent high quality and repeatable performance. Where polypropylene or polyester are not able to be used for reasons of chemical compatibility or temperature, we also off a range of Nylon, M-Aramid, and PTFE felts. Sewn Polypropylene and polyester needlefelt filter bags are manufactured with a sewn ring, a welded centre seam and a sewn bottom. Nylon, m-aramid, and PTFE felt filter bags have an all sewn construction. A comprehensive choice of sealing rings are available to suit the needs of the application : 7” or 4” galvanised Steel rings (or stainless steel) which fit universally into all filter housings. Polypropylene rings and stainless steel bands are also available. As standard, these products feature integrated lifting handles. Custom designed positive sealing Santaseal moulded ring, for applications where high temperature or chemical resistance properties are required. All filter bags are manufactured to ISO 9001 quality standards and under food safe and silicone free conditions to minimise any possible contaminations. Download: Sewn Needlefelt Filter Bags Brochure ENQUIRE Chemical Compatability Guide Media / Collar Type Acids Alkali Solvents Oxidants Recommend Maximum Operating Temperature (*C) Polyester Good Good Excellent Poor 140*C Polypropylene Excellent Excellent Good Excellent 93*C Nylon Fair Good Excellent Fair 110*C Nomex* Good Good Excellent Excellent 200*C PTFE Excellent Excellent Excellent Excellent 260*C Santoprene* Excellent Excellent Excellent Excellent 200*C Bag Size Diameter (inches/mm) Length (inches/mm) Surface Area (m2) Volume (l) Maximum Flow Rate (m3/hr)* 1 7″/180mm 17″/430mm 0.25 11.0 20 2 7″/180mm 32″/810mm 0.50 20.0 40 3 (1M) 4″/104mm 9″/230mm 0.07 1.9 6 4 (2M) 4″/104mm 14″/360mm 0.12 3.2 10 *Flow rate depends on factors such as filter media type, micron rating, and fluid being filtered. All dimensions are nominal. Related Products Standard Filter Bags Allied Filter Systems Ltd manufactures high quality liquid filter bags to fit standard size filter vessels, as well as custom designed products where requested. The constituent materials have been chosen for their purity, consistent high quality and repeatable performance. Filter bags are available in traditional stitched form or with a fully welded construction, and are fitted with a comprehensive choice of rings. Read more Sewn Needlefelt Filter Bags Needlefelts are a versatile and cost effective media providing a high solid holding capacity for both non-deformable and deformable, gelatinous particles. By means of a depth filtration mechanism, particles penetrate and are captured throughout the depth of the filter media. Read more Fully Welded Filter Bags All seams are welded rather than sewn, and combined with our positive sealing moulded Welseal (polypropylene or polyester) welded ring, no process liquid can bypass through needleholes caused by the sewing process or around a traditional metal ring. The Welseal ring forms a 360o hermetic seal between the filter bag and housing, ensuring that fully welded filter bags perform to a higher efficiency than a sewn equivalent. Read more Allied Filter Systems Ltd Huntsman Drive, Northbank Industrial Park, Irlam, Manchester, M44 5EG T: +44 (0) 161 777 9500 E: sales@alliedfilter.co.uk FM36648 Useful Links About Us Meet Our Team Environmental Policy Cookies Contact Us Get In Touch You can subscribe to our newsletters here, or Unsubscribe here UK - FR - SE