A kind of non-woven fabric with two-component gradient structure for water filtration and its preparation method and application

Abstract

The invention discloses a two-component gradient structure non-woven fabric for water filtering and a preparation method thereof. The non-woven fabric is composed of a first-layer fiber web and a second-layer fiber web which are bonded together, wherein the first-layer fiber web and the second-layer fiber web are each composed of trefoil PET filament fibers and circular COPET filament fibers which have different finenesses. The preparation method comprises the steps that PET slices and COPET slices which are subjected to pre-crystallization are fully dried; fusion overstocking, spinning, cooling, drafting and separation lapping are conducted through two groups of different spinning assemblies, then the obtained two layers of fiber webs are overlapped to form a composite fiber web, and finally the composite fiber web is subjected to hot air bonding and melting to be reinforced into a whole. According to the two-component gradient structure non-woven fabric for water filtering, the advantages of different fineness filtering in a filter material can be fully exerted, the filtering efficiency is guaranteed, the service life is effectively prolonged, and pressure drop is controlled within a reasonable range; accordingly, the non-woven fabric has the advantages of being free of rolling points, high in ventilation property and filtering precision, low in pressure drop and long in service life.

Description

technical field

[0001] The invention relates to the technical field of nonwoven fabrics, in particular to a nonwoven fabric with a two-component gradient structure for water filtration, a preparation method and application thereof. Background technique

[0002] Polyester non-woven fabric is made of polyester filament fiber hot-melt bonding. During the bonding process, it relies on self-melting bonding and entanglement to form a three-dimensional microporous structure randomly arranged in space. It is mainly used as a filter material. The filter material is mainly through the inter-fiber pore size and the interaction between the single fiber and the particles, that is, when the liquid passes through, the larger particles will be blocked by the pore size between the fibers and deposited, and the smaller particles will change the flow direction when the liquid encounters the fibers, and the particles will flow under their own gravity. Under the action of changing the flow direc...

Images