LIGHTER SPUNBONDED WEB WITH SPECIAL MECHANICAL PROPERTIES Russian patent published in 2011 - IPC D04H3/16 A61F13/15 

FIELD: textile, paper.

SUBSTANCE: spunbonded web from polyolefin threads with thread titre from 1 to 1.3 dtex, besidesm polyolefin threads are produced from metallocene polypropylene (t-PP). The spunbonded web is exposed to thermal strengthening, has surface density from 4 to 12 g/m² and volume density in the range from 0.06 to 0.073 g/cm³, and also the maximum stretching force from 9.5 to 62 n in direction of the machine and from 4.5 to 35 n across machine direction, air permeability from 3900 to 8350 l/(m²xs) and a water column from 7 to 11 cm. Also a laminated is proposed, formed at least from two layers of nonwoven materials, besides, at least one layer comprises a lighter above-specified spunboded web. The spunbonded web and laminate are used to produce personal hygiene items, napkins, filters, wound dressings, covers in field crop cultivation and vegetable growing.

EFFECT: improved mechanical and barrier properties.

8 cl, 7 dwg, 2 tbl, 3 ex