Abstract: A method of conveying and treating a web, wherein the web is first conveyed over a transport surface and then over a rotating transfer roller at the end of the transport surface. The web is transferred from the transfer roller to a treatment roller at a spacing from the transfer roller. The conveying of the web is performed with the proviso and particularly a spacing a between the transfer roller and the treatment roller is set such that the web wraps around the treatment roller over a wrap angle ? from 15° to 90°.

Abstract: A method of conveying and treating a web, wherein the web is first conveyed over a transport surface and then over a rotating transfer roller at the end of the transport surface. The web is transferred from the transfer roller to a treatment roller at a spacing from the transfer roller. The conveying of the web is performed with the proviso and particularly a spacing a between the transfer roller and the treatment roller is set such that the web wraps around the treatment roller over a wrap angle ? from 15° to 90°.

Abstract: This invention relates to polypropylene fibers and fabrics containing polypropylene fibers, the fibers comprising propylene polymers comprising at least 50 mol % propylene, said polymers having: a) a melt flow rate (MFR, ASTM 1238, 230° C., 2.16 kg) of about 10 dg/min to about 25 dg/min; b) a dimensionless Stress Ratio/Loss Tangent Index R2 [defined by Eq. (8)] at 190° C. from about 1.5 to about 30; c) an onset temperature of crystallization under flow, Tc,rheol, (as determined by SAOS rheology, 190° C., 1° C./min, where said polymer has 0 wt % nucleating agent present), of at least about 123° C.; d) an average meso run length determined by 13C NMR of at least about 55 or higher; and e) optionally, a loss tangent, tan ?, [defined by Eq. (2)] at an angular frequency of 0.1 rad/s at 190° C. from about 14 to about 70.

Abstract: An apparatus for making a spunbond web has a deposition surface, a spinneret above the surface for producing filaments that move downward along a path toward the surface, and a cooling chamber below the spinneret. Cool process air is supplied to the chamber to cool the filaments as they pass downward through the chamber. A laterally closed stretching unit downstream of the cooling chamber has laterally closed side walls that have portions that diverges downward. A connecting region between the stretching unit and the cooling chamber substantially excludes access of air from outside to the filaments as they pass from the cooling chamber to the stretching unit so that the filaments drop from the stretching unit onto the deposition surface.

Abstract: A spunbond fleece is made by passing cellulosic filaments from a spinneret in a travel direction through a cooling chamber having upstream and downstream compartments spaced apart in the travel direction. In each of the compartments a respective stream of cooling air is directed against the filaments. The cooling air of each stream has parameters of temperature, humidity, and flow rate. At least one of the parameters of one of the streams is varied such that it is different from corresponding parameter of the other stream.

Abstract: An apparatus for making a spunbond web has a deposition surface, a spinneret above the surface for producing filaments that move downward along a path toward the surface, and a cooling chamber below the spinneret. Cool process air is supplied to the chamber to cool the filaments as they pass downward through the chamber. A laterally closed stretching unit downstream of the cooling chamber has laterally closed side walls that have portions that diverges downward. A connecting region between the stretching unit and the cooling chamber substantially excludes access of air from outside to the filaments as they pass from the cooling chamber to the stretching unit so that the filaments drop from the stretching unit onto the deposition surface.

Abstract: A web or fleece of synthetic resin strand collected on a sieve belt is discharged from the sieve belt into further processing equipment over a rerouting roller at the discharge end of the sieve belt. The rerouting roller is perforated and air or another fluid medium is passed through the belt at the rerouting roller to reduce adhesion forces between the belt and the web and lift the web from the belt without damage to the belt.

Abstract: A nozzle for producing filaments or fibers of thermoplastic synthetic resin has at the nozzle end one or more bores, preferably opening at a flat surface and receiving respective inserts or shaped bodies which are formfitting in the bores and have along their peripheries respective nozzle channels opening at orifices through which the synthetic resin is discharged. Air streams may be directed at the strand at an acute angle when fibers are to be produced.

Abstract: Device for producing filaments from thermoplastic synthetic, with a meltblown die head, which as a guiding core with at least one row of orifices for the discharge of molten synthetic, one or more feed devices for primary blown air on both sides of the synthetic guiding core with which the filaments in the region of the apertures of the orifices can be subjected to primary blown air on both sides, and at least one feed device for secondary blown air with which the filaments can be subjected to secondary blown air sideways beneath the meltblown die head.

Abstract: An apparatus for producing a melt blown web in which the collecting screen upon which the filaments are deposited passes over a plurality of suction regions or areas which have respective suction blowers and controls for the suction force and air throughput.

Abstract: Device for the continuous production of a nonwoven web from filaments made from a thermoplastic synthetic, with a spinning nozzle, a cooling chamber, a stretching unit and a depositing device for depositing the filaments to the nonwoven web. Two or more different polymer fusions can be fed to the spinning nozzle, and a device for merging the different polymer fusions is provided such that bi-component filaments and multi-component filaments can exit from the spinning nozzle openings of the spinning nozzle. The cooling chamber is divided into at least two cooling chamber sections in which the bi-component filaments and multi-component filaments can be respectively acted upon by process air with different convective heat conduction means.

Abstract: An apparatus for producing spun-bond webs has, beneath the receiving belt, a suction unit having at least two suction zones including a primary suction zone and at least one other suction zone, the primary suction zone receiving most of the filaments from an aerodynamic stretching unit below a spinneret. The suction speeds in the two zones can be adjusted independently of one another. Preferably three such zones are provided in succession in the direction of displacement of the perforated belt.

Abstract: A spun-bond web-making apparatus has the cooling passage below the spinneret provided with a plurality of air chamber sections which are supplied with air at different temperatures, the cooling passage being connected to the drawing unit for aerodynamic stretching of the filaments without a gap through which external air can be supplied.

Abstract: In the production of a spunbond web by aerodynamically stretching thermoplastic filaments from a spinneret, the stretching nozzle is formed by two nozzle-forming units each of which has a temperature control device, especially a heater, to minimize deformation at the stretching nozzle defining wall. The result is a reduction in the tolerance of the basis weight of the spunbond web.

Abstract: A nozzle for producing filaments or fibers of thermoplastic synthetic resin has at the nozzle end one or more bores, preferably opening at a flat surface and receiving respective inserts or shaped bodies which are formfitting in the bores and have along their peripheries respective nozzle channels opening at orifices through which the synthetic resin is discharged. Air streams may be directed at the strand at an acute angle when fibers are to be produced.

Abstract: A web or fleece of synthetic resin strand collected on a sieve belt is discharged from the sieve belt into further processing equipment over a rerouting roller at the discharge end of the sieve belt. The rerouting roller is perforated and air or another fluid medium is passed through the belt at the rerouting roller to reduce adhesion forces between the belt and the web and lift the web from the belt without damage to the belt.

Abstract: An apparatus for producing a melt blown web in which the collecting screen upon which the filaments are deposited passes over a plurality of suction regions or areas which have respective suction blowers and controls for the suction force and air throughput.

Abstract: A spun-bond web-making apparatus has the cooling passage below the spinneret provided with a plurality of air chamber sections which are supplied with air at different temperatures, the cooling passage being connected to the drawing unit for aerodynamic stretching of the filaments without a gap through which external air can be supplied.

Abstract: An apparatus for producing spun-bond webs has, beneath the receiving belt, a suction unit having at least two suction zones including a primary suction zone and at least one other suction zone, the primary suction zone receiving most of the filaments from an aerodynamic stretching unit below a spinneret. The suction speeds in the two zones can be adjusted independently of one another. Preferably three such zones are provided in succession in the direction of displacement of the perforated belt.

Abstract: In the production of a spunbond web by aerodynamically stretching thermoplastic filaments from a spinneret, the stretching nozzle is formed by two nozzle-forming units each of which has a temperature control device, especially a heater, to minimize deformation at the stretching nozzle defining wall. The result is a reduction in the tolerance of the basis weight of the spunbond web.