NONWOVEN NEEDLE STITCHED FILTERING MATERIAL WITH INCREASED INITIAL DEFORMATION RESISTANCE AND METHOD FOR MANUFACTURING THE SAME Russian patent published in 2005 - IPC

FIELD: textile industry, in particular, production of nonwoven needle stitched filtering materials.

SUBSTANCE: method involves providing mechanical or aerodynamic forming of fibrous cloth from two-component filament mixture; providing needle stitching and thermal rolling of resultant cloth on calendar. Polyester filament is added to two-component filament mixture. Thermal treatment of material is effectuated in mode providing for compaction of surface layer. Needle stitching density is 20-800 punctures per 1 cm². Rolling procedure is carried out at roll temperature of 130-220⁰C and rolling rate of 1-15 m/min. Nonwoven needle-stitched filtering material has surface density not in the excess of 400 g/m² and filtering fullness coefficient of at least 40%, when suspension subjected to filtering has solid particles with mean size not in the excess of 2 microns and when loading of at least 15 kg is applied to 5 cm width sample for achieving of 10% elongation.

EFFECT: increased resistance to the development of initial deformation of material.

8 cl, 2 tbl, 2 ex