NONWOVEN FILTERING MATERIAL Russian patent published in 2014 - IPC D04H13/00 

FIELD: textiles, paper.

SUBSTANCE: nonwoven filtering material comprising a nonwoven web of an anion-exchange modified polyamide fibres and a system of fastening loops of stitching thread, additionally comprises a second fibrous layer of hydrophilic modified polyamide fibres, the stitching thread is used as the yarn from a mixture of hydrophilic modified polyamide fibres and the high-shrinkage viscose fibres with the content of the latter in the mixture of 30-40%, the stitching thread when fastening with the tricot laying forms the plush broaching located between the fibrous layers, at that the distance between the layers is 4-7 mm, and the ratio of the layer of the modified anion-exchange polyamide fibres, the stitching thread and the layer of hydrophilic modified polyamide fibres by weight is 1:0.2:0.5.

EFFECT: increased protective properties of the filtering elements of the respirators reduced suction coefficient due to increasing the stiffness of adjacency of the half-mask along the line of obturation.

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