High-loft spunbond non-woven webs and method of forming same
AssigneeNordson Corporation
InventorsMartin A. Allen, Patrick L. Crane, Jon R. Butt SR.
Life of this patent
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Abstract
A non-woven web formed from substantially continuous and uninterrupted multi-component filaments in which the filaments are spun at a spinning speed adequate for molecularly orienting less than all of the various constituent polymers. After collection, the non-woven web is either heated or receives a tensile force that causes each filament region formed from the polymer lacking molecular orientation to shrink in length considerably more than other filament regions formed from molecularly-oriented polymers. The differential length reduction enhances the loft of the non-woven web.
Claims13
A method of making a non-woven web with a high loft, comprising:
- melting a first polymer;
- melting a second polymer;
- combining the first and second polymers to form a plurality of substantially continuous and uninterrupted multi-component filaments, each of the filaments having distinct first and second regions comprising the first polymer and the second polymer respectively;
- attenuating the filaments at a spinning speed effective for causing significant molecular orientation of only the first polymer;
- collecting the plurality of substantially continuous and uninterrupted multi-component filaments to form a non-woven web;
- and
- reducing a second length of the second region of each filament more than a first length of the first region.
A high-loft spunbond non-woven web formed from a plurality of substantially continuous and uninterrupted multi-component filaments produced by the process comprising the steps of:
- melting a first polymer;
- melting a second polymer;
- combining the first and second polymers to form a plurality of substantially continuous and uninterrupted multi-component filaments, each of the filaments having distinct first and second regions comprising the first polymer and the second polymer respectively;
- attenuating the filaments at a spinning speed effective for causing significant molecular orientation of only the first polymer;
- collecting the plurality of substantially continuous and uninterrupted multi-component filaments to form a non-woven web;
- and
- reducing a second length of the second region of each filament more than a first length of the first region.
A hygienic article comprising:
- a liquid-pervious top sheet;
- a liquid-impervious back sheet covering the liquid storage layer, said back sheet having an outwardly-facing surface formed from a loop-type material capable of forming a releasable attachment with a hook-type material;
- a liquid storage layer positioned between said top sheet and said back sheet;
- and
- at least one hook-type fastener attached to said back sheet, said hook-type fastener being formed from said hook-type material.
Dependencies are inferred from the claim text.