Process for melt-spinning of synthetic polymers

US4436688A · kind A · utility

Assignee

• Davy McKee Aktiengesellschaft · DE

Inventors

• Gunter Koschinek · Dietzenbach, DE
• Dietmar Wandel · Hanau, DE
• Bernd Kretschmann · Kronberg, DE
• Rolf Zinsser · Heusenstamm, DE

Key dates

• Filing date: Apr 13, 1981
• Grant date: Mar 13, 1984
• Expiry date: Apr 13, 2001

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D01D5/092
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

An improved process and apparatus for the melt-spinning of synthetic polymers are disclosed. The process and apparatus are preferably adapted to polymers such as polyamide 6, polyamide 66, polyester and their copolymers. The polymers are melt-spun in a spinneret and the resulting filaments are withdrawn at a speed between 600 and 6000 meters/min. The distance between the uppermost blow point of the cooling zone and the spinneret surface is selected so that the distance is within a range, the upper limit of which is defined by the relation B and the lower limit is defined by one of the relations A.sub.1 or A.sub.2 or A.sub.3 as follows: EQU B=48.2 (log v)-109 (mm) EQU A.sub.1 =34.4 (log v)-71 (mm) EQU A.sub.2 =-32 (log v-3.356).sup.2 +34 (mm) EQU A.sub.3 =-44 (log v-3.221).sup.2 +32 (mm), where v is the spinning withdrawal speed in meters/min.