Method of producing a nonwoven material and nonwoven material produced according to the method
AssigneeSCA Hygiene Paper AB
InventorLennart Reiner
Life of this patent
Estimating the term…
Abstract
Method of producing a nonwoven material by hydroentangling of a fiber web, whereby dry fibers, natural and/or synthetic, are metered into a dispersion vessel, possibly after pre-wetting. The fibers are dispersed in a foamable liquid including water and a tenside for forming a foamed fiber dispersion, which is applied to a wire and drained. The formed fiber web is subjected to hydroentangling directly after forming and the foamable liquid, after having passed through the wire, is recirculated to the dispersion vessel in a simple closed circuit.
Claims12
Method of producing a nonwoven material for use in hydroentangling of a fibre web, said method comprising the steps of:
- metering dry fibres, natural and/or synthetic, into a dispersion vessel, the fibres being dispersed in a foamable liquid comprising water and a tenside for forming a foamed fibre dispersion,
- applying the foamed fibre dispersion to a wire in a closed and, during forming, foam-filled forming unit, and
- recirculating the foamable liquid, after passing through the wire, to the dispersion vessel in a simple closed circuit via a closed foam tank in which the foamable liquid is separated into a liquid phase and a lighter foam phase,
- wherein liquid from the bottom of the foam tank is led to the dispersion vessel via a first pipeline and the foam pass to the dispersion vessel via a second pipeline in the top of the foam tank,
- wherein fibres are added to the dispersion vessel and dispersed in he foamable liquid, and
- wherein the pressure in the foam tank is kept substantially constant.
Dependencies are inferred from the claim text.