US 8,381,375 B2 · Method for controlling the local characteristics of a non-woven textile and related installation

Abstract

A crosslapper receives a card web and folds it into a lap intended to be needle-punched or consolidated by other ways. The web includes zones which are more condensed, having a spectrum of orientation of fibers with a component parallel to the width of the web, alternating with less condensed zones having a longitudinal unidirectional spectrum of orientations. The zones which are less condensed are used to form the edge zones of the lap. The result is that the lap has different respective spectra of orientation which pre-compensate for the unwanted changes produced by the needle-punching or other consolidation which follows. A needle-punched lap is obtained having a uniform MD/CD ratio (relationship between longitudinal and respectively transverse tensile strengths) or having a sought profile of the MD/CD ratio across the width of the lap.

Claims31

Dependent claims

A method for the production of a non-woven textile comprising fibres, with the following steps:

producing a non-woven strip;
and
subjecting said strip to a consolidation step differently affecting a distribution of orientations of the fibres depending on a position of the fibres along the width of the strip;
wherein, by a dynamic control, influence is exerted in a targeted manner on the distribution of orientations of the fibres according to the position of said fibres in the width direction of the strip prior to the consolidation step;
whereby different distributions of orientation are established at different points of the width of the strip before consolidation in such a targeted manner that the non-woven textile obtained after the consolidation step exhibits a substantially uniform MD/CD ratio over the width of the textile, said MD/CD ratio being the ratio of one of mechanical strengths and elongations in the longitudinal direction and in the width direction, respectively.

2 more elements

A method for the production of a non-woven textile comprising:

producing a non-woven strip comprising fibres, the non-woven strip defining a width direction (CD) and a longitudinal direction (MD);
subjecting the non-woven strip to a consolidation step that differently affects a distribution of orientations of the fibres depending on a position of the fibres along the CD of the non-woven strip;
and
exerting influence by a dynamic control in a targeted manner on the distribution of orientations of the fibres according to the position of the fibres in the CD of the non-woven strip prior to the consolidation step;
wherein different distributions of orientation are established at different points of the CD of the non-woven strip before the consolidation step in such a targeted manner that the non-woven textile obtained after the consolidation step exhibits a substantially uniform MD/CD strength ratio over the width of the textile, said MD/CD strength ratio being the ratio of mechanical strengths in the MD and in the CD, respectively.

2 more elements

Dependencies are inferred from the claim text.

Method for controlling the local characteristics of a non-woven textile and related installation

Life of this patent

Method for controlling the local characteristics of a non-woven textile and related installation

Life of this patent

Abstract

Claims31