CONDUCTIVE WEBS AND METHOD OF THEIR MANUFACTURING Russian patent published in 2014 - IPC D04H1/42 

FIELD: textiles, paper.

SUBSTANCE: nonwoven fabric comprises: a nonwoven base web consisting of cellulose fibres in an amount of at least about 50 wt %; cellulose fibres comprising softwood fibres having Canadian Standard Freeness, at least about 350 ml; conductive fibres in an amount from about 5 wt % to about 15 wt %. The conductive fibres comprise carbon fibres having the purity of at least about 85%, at that the pulp fibres are mixed with the carbon fibres. The main web has the tensile strength in the longitudinal direction of at least 5900 grams-force (which corresponds to 57.9 N), the base weight is less than about 40 g·m^-2, the voluminosity is less than about 1 cm³/g, the resistance is less than about 100 ohm/square. At that the basic web comprises water-resistant material and is non-embossed. The carbon fibres have the length from about 1 mm to about 6 mm. The method of manufacturing the conductive paper web comprises applying the aqueous suspension of fibres onto the porous forming surface to form a wet web, smoothing the web, drying and cutting the web into a plurality of bands having the width of about 3 mm to about 10 mm. Each band is wound crosswise onto the bobbin.

EFFECT: creation of conductive elements is provided for use in moisture indicators without the use of metal-containing materials.

20 cl, 10 dwg, 2 tbl