Abstract: A method for producing high-tenacity polypropylene fibers with a tenacity greater than 6 cN/dtex and an elongation of less than 40%. To produce as much as possible fibers of a very fine denier, the fiber strands are spun in a first step at a low melting point of less than 250° C., and are withdrawn at a relatively low withdrawal speed of less than 100 m/min., while being simultaneously cooled by a gaseous cooling medium. Subsequently, the fiber strands undergo drawing in at least three draw zones with a total draw ratio greater than 4:1. In this process, the fiber strands are partially drawn in the first draw zone to at least 70% of the total draw. After having been drawn, the fiber strands are cut to a predetermined fiber length.

Abstract: A method and an apparatus for producing staple fibers, wherein in a first step a tow is formed from melt spun filaments and deposited into a can, and wherein in a second process step the tows of a plurality of cans in a can creel are withdrawn, treated, and cut to staple fibers. To obtain as much as possible short times of interruption between the first and second process steps, the invention provides for depositing the tow in the first process step directly into the can accommodated in the can creel, with the cans of the can creel being filled one after the other.

Abstract: A method and an apparatus for melt-spinning and cooling a plurality of filaments which are processed to form a non-woven fabric or web. The filaments are guided after extrusion in the form of a filament curtain through a cooling zone and are cooled by a cooling air stream blown transversely to the filament curtain. In order to prevent the flow effects created by air swirls in the side edge zones of the filament curtain, an additional quenching air stream acts inside the cooling zone on each side edge of the filament curtain. For this purpose, the inventive apparatus comprises a quenching member positioned below each longitudinal end of the spinneret.

Abstract: A method and an apparatus for melt spinning and cooling a plurality of synthetic filaments, wherein the filaments are extruded in a first step in an annular arrangement by means of a spinneret (1). The filaments subsequently advance along an outflow quench diffuser (12) and undergo cooling by an airflow that radially emerges from the jacket of the outflow quench diffuser. The filaments undergo for purposes of being solidified and before being cooled by the diffuser jacket airflow, a precooling by an additional precooling airflow (7), which is generated by a cooling means (6) arranged between the spinneret (1) and the outflow quench diffuser (12).

Abstract: A method for producing high-tenacity polypropylene fibers with a tenacity greater than 6 cN/dtex and an elongation of less than 40%. To produce as much as possible fibers of a very fine denier, the fiber strands are spun in a first step at a low melting point of less than 250° C., and are withdrawn at a relatively low withdrawal speed of less than 100 m/min., while being simultaneously cooled by a gaseous cooling medium. Subsequently, the fiber strands undergo drawing in at least three draw zones with a total draw ratio greater than 4:1. In this process, the fiber strands are partially drawn in the first draw zone to at least 70% of the total draw. After having been drawn, the fiber strands are cut to a predetermined fiber length.

Abstract: An apparatus for melt spinning and cooling a group of filaments comprising a spinning device with an annular spinneret and a cooling device arranged below the spinning device. The cooling device comprises a holder that is connected to a coolant dispersing head. The coolant dispersing head is centered relative to the spinneret with contact between the spinning device and the holder in an operating position. The coolant dispersing head can be guided into a standby position at a distance from the spinneret. A guide tube encloses the coolant dispersing head in the manner of a jacket with a clearance and which is open at its end facing toward the spinning device. The guide tube and coolant dispersing head are displaceable relative to one another in axial direction to produce an air stream at the blowing end of the guide tube during transition from the standby position to the operating position.

Abstract: A device and a method for the melt spinning and depositing of a plurality of tows (5.1, 5.2, . . . , 5.n) utilizes several spinning devices (1.1, 1.2, . . . , 1.n) by means of which one of the tows 5.1, 5.2, . . . , 5.n is produced from a filament bundle (4.1, 4.2, . . . , 4.n). Each spinning device (1.1, 2.2, . . . , 1.n) is associated with a respective drawing-off device and a respective can depositing device (3.1, 3.2, . . . , 3.n) so that each of the tows (5.1, 5.2, . . . , 5.n) can be deposited individually in a respective can (19.1, 19.2, . . . , 19.n).

Abstract: An apparatus for melt spinning and cooling a group of filaments comprising a spinning device with an annular spinneret and a cooling device arranged below the spinning device. The cooling device comprises a holder that is connected to a coolant dispersing head. The coolant dispersing head is centered relative to the spinneret with contact between the spinning device and the holder in an operating position. The coolant dispersing head can be guided into a standby position at a distance from the spinneret. A guide tube encloses the coolant dispersing head in the manner of a jacket with a clearance and which is open at its end facing toward the spinning device. The guide tube and coolant dispersing head are displaceable relative to one another in axial direction to produce an air stream at the blowing end of the guide tube during transition from the standby position to the operating position.

Abstract: A device and a method for the melt spinning and depositing of a plurality of tows (5.1, 5.2, . . . , 5.n) utilizes several spinning devices (1.1, 1.2, . . . , 1.n) by means of which one of the tows 5.1, 5.2, . . . , 5.n is produced from a filament bundle (4.1, 4.2, . . . , 4.n). Each spinning device (1.1, 2.2, . . . , 1.n) is associated with a respective drawing-off device and a respective can depositing device (3.1, 3.2, . . . , 3.n) so that each of the tows (5.1, 5.2, . . . 5.n) can be deposited individually in a respective can (19.1, 19.2, . . . , 19.n).