Process for producing a hydrodynamically strengthened nonwoven, nonwoven after this production and carrier fleece after this production

摘要

For the prodn. of nonwovens, continuous filaments are laid directly after spinning into a web of a consistent thickness. The web is needle bonded by a hydrodynamic action to give a high tensile nonwoven, to be used as a carrier layer without a bonding agent. The entire surface is given a functional coating. The bonded nonwoven is heat treated to give three-dimensional stability, before coating with a bitumen material.A glass fiber layer is bonded to the needle-bonded nonwoven before and/or with the bitumen coating action, or the glass fiber layer can be impregnated with bitumen.The hydrodynamic needle bonding is applied with an energy of at least 0.3 kWh/kg fibers. The hydrodynamic needling is applied alternately to both sides of the continuous moving web, and the needling develops a perforated structure in the material. POLYMERS - The continuous filaments are of pure polyethylene (PE), or of polyamide fibers, polyolefin filaments and pref. polyethylene or polypropylene filaments.