MULTILAYER NONWOVEN FILTRATION MATERIAL Russian patent published in 2012 - IPC B01D39/16 D04H1/46 

FIELD: process engineering.

SUBSTANCE: invention relates to cleaning of hydrocarbon fuel, particularly, to multilayer nonwoven filtration material. Proposed material comprises layers of synthetic staple fibers bonded together by bundles of fibers of fibrous layers formed by dual-side needle-punching to extend down to definite depth of every layer. Said material is subjected to heat setting and comprises four layers. First and second layers consist of the mix of polyester fibers with linear density of 0.33 tex and 0.17 tex at the ratio of fibers in said mix making 50:50 wt %. Third and fourth layers consist of polyester fibers with linear density of 0.33 tex. Every nest layer is laid on previous one. Said layers are bonded by sequential needle-punching by bundles of fibers, penetration depth of which makes at least 1/3 of previous layer thickness. Penetration zones of bundles are shifted relative to each other and to previous layer and to next layer by amount of feed for punching. Note here that first and second layers are additionally bonded by punching on the first layer side.

EFFECT: longer life, nominal filtration rating of 5 mcm.

1 dwg, 1 tbl