초록 ▼

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

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.

대표청구항 ▼

A multifilament yarn comprising high-modulus monofilaments having an initial modulus of more than 50 GPa which have been intermingled, said multifilament yarn having a total linear density of 500-4000 dtex, wherein the average entanglement spacing of the multifilament yarn, measured in the pin count

A multifilament yarn comprising high-modulus monofilaments having an initial modulus of more than 50 GPa which have been intermingled, said multifilament yarn having a total linear density of 500-4000 dtex, wherein the average entanglement spacing of the multifilament yarn, measured in the pin count test, is less than 150 mm, and the number of broken monofilament ends, measured by the light barrier method on one side of the multifilament yarn, is less than 20/m.