Hoch nass-festes, geblasenes Polyolefin-Mikrofaser-Vlies sowie Verfahren und Apparat zu seiner Herstellung

• Main Authors: INSLEY, THOMAS I, MEYER, DANIEL E
• Format: Patent
• Language: German
• Published: 11.05.1995
• Edition: 6
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBONFILAMENTS; BRAIDING; CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS,THREADS, FIBRES, BRISTLES OR RIBBONS; COFFEE MILLS; COTTON-WOOL; DOMESTIC ARTICLES OR APPLIANCES; DOMESTIC WASHING OR CLEANING; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS,NON-WOVEN FABRICS; FURNITURE; HUMAN NECESSITIES; KNITTING; LACE-MAKING; MAKING GRANULES OR PREFORMS; MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARYMATERIAL; MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OFARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES ORRIBBONS; NATURAL OR ARTIFICIAL THREADS OR FIBRES; NON-WOVEN FABRICS; PERFORMING OPERATIONS; PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; SPICE MILLS; SPINNING; SUCTION CLEANERS IN GENERAL; TEXTILES; TRANSPORTING; TRIMMINGS; WADDING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

A polyolefin BMF web made from a mixture of polypropylene and surfactant can have high wet strength when a) the surfactant is nonionic and b) the surfactant is mixed with the polypropylene at a static mixer (18) that interconnects the extruder (10) and the BMF die (26). By so postponing the addition of the surfactant, it is protected from both the exceedingly high temperatures of the extruder (10) and from the high shearing forces within the extruder (10). The surfactant also is heated to high temperatures for a much shorter time than if it were premixed with the polypropylene.