Intermingled multifilament yarn comprising high modulus monofilaments and production thereof

US5293676A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Josef Geirhos · Bobingen, DE
• Ingolf Jacob · Untermeitingen, DE

Key dates

• Filing date: Apr 26, 1991
• Grant date: Mar 15, 1994
• Expiry date: Apr 26, 2011

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2976
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

There is described an intermingled multifilament yarn comprising high modulus monofilaments made for example of aramid, carbon or glass and a process for producing this yarn. Conventional air intermingling is impracticable for high modulus yarns since they tend to break, because of their brittleness, which leads in particular to an appreciable reduction in the tenacity. The invention proposes carrying out the intermingling at elevated temperature--either by preheating the yarn or by heating the intermingling air. It is found, surprisingly, that, although the entanglement spacings are relatively low, the tenacity remains substantially unaffected and in some instances is even raised. The multifilament yarn produced by this process is noteworthy in particular for the low number of broken monofilament ends. The invention can also be applied to commingled yarns, yarns which are part high modulus filaments and part thermoplastic filaments.