METHOD FOR PRODUCING A NONWOVEN ITEM, NONWOVEN ITEM AND HYGIENE ARTICLE
A method for producing a nonwoven element particularly for hygiene products, has at least the following steps: forming a fibrous web sheet with a width direction extending transverse to the production direction and a thickness direction perpendicular thereto by supplying staple fibers from at least a first group which are formed from a thermoplastic material, consolidating the fibrous web sheet to form a nonwoven web by heating exclusively a first side of the fibrous web sheet through contact with a heated surface such that the staple fibers of the first group are partially melted, and cooling the nonwoven web.
1 . A method for producing a nonwoven element for hygiene products, comprising at least the following steps:
forming a fibrous web sheet with a width direction extending transverse to a production direction and a thickness direction perpendicular to the width direction by supplying staple fibers from at least a first group which are formed from a thermoplastic material,
consolidating the fibrous web sheet to form a nonwoven web by heating exclusively a first side of the fibrous web sheet through contact with a heated surface such that the staple fibers of the first group are partially melted, and
cooling the nonwoven web.
2 . The method according to claim 1 , wherein the heated surface is part of a heating roll over which the fibrous web sheet is guided.
3 . The method according to claim 2 , wherein a contact time between a portion of the fibrous web sheet and the heated surface amounts to between 0.05 s and 0.4 s.
4 . The method according to claim 1 , wherein the heated surface has a heating temperature of between 120 and 250° C.
5 . The method according to claim 1 , wherein the staple fibers of the first group are formed at least partially from polyolefin.
6 . The method according to claim 1 , wherein the staple fibers of the first group are formed at least partially from biodegradable thermoplastic polymers.
7 . The method according to claim 1 , wherein a second side of the fibrous web sheet is partially cooled.
8 . The method according to claim 1 , wherein at least staple fibers from a second group formed from a non-fusible material are supplied to form the fibrous web sheet.
9 . The method according to claim 8 , wherein the staple fibers of the second group are natural fibers selected from the group consisting of cotton, wool, silk, linen, hemp and fibers of regenerated cellulose.
10 . The method according to claim 1 , wherein the staple fibers are carded to form the fibrous web sheet.
11 . The method according to claim 1 , wherein through-air bonding or a thermal calendering is used to consolidate the fibrous web sheet.
12 . The method according to claim 11 , wherein the heating roll is formed as a calender roll of a calendering device.
13 . The method according to claim 1 , wherein at least a further layer is supplied, the further layer being selected from the group consisting of staple fibers, carded web and film.
14 . The method according to claim 1 , further comprising the step of severing individual nonwoven elements from the nonwoven web, after said step of cooling.
15 . A nonwoven element for hygiene products, obtained according to the method of claim 1 , wherein the element comprises a layer of staple fibers which extends in a longitudinal direction, a width direction running transverse to the longitudinal direction and a thickness direction running perpendicular to the width direction, and wherein the staple fibers are partially fused together proceeding from a first side.
16 . The nonwoven element according to claim 15 , wherein a density decreases along the thickness proceeding from the first side.
17 . The nonwoven element according to claim 15 , wherein the element has a mass per unit area between 10 and 60 g/m 2 .
18 . A hygiene element which is at least partially formed from a nonwoven element according to claim 15 .
19 . The hygiene element according to claim 18 , which is selected from the group consisting of diapers, hygiene wet wipes and incontinence articles.