Method of treating synthetic yarns

US3972176A · kind A · utility

Assignee

• National Spinning Co., Inc. · US

Inventors

• John Lawson · Ortonville, US
• Chester A. Williams · Lake Waccamaw, US

Key dates

• Filing date: Oct 3, 1974
• Grant date: Aug 3, 1976
• Expiry date: Oct 3, 1994

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D06B17/005
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A novel and improved carpet yarn for cut-pile carpets is produced by twisting a strand of yarn having pre-existing latent filament crimp characteristics to a predetermined twist level in a given direction and then plying it with a similar strand or strands having the same amount of twist inserted therein in the same direction. The yarns are plied together, receiving a ply twist essentially equal in amount to the twist in the single strands, but in the opposite direction. The plied yarn is then wound on a rotating mandrel which is also adapted to advance the yarn along the length of the mandrel and through a treatment zone wherein predetermined conditions of heat and moisture are applied to fully develop the latent crimp characteristics of the yarn filaments. The plied yarn is then removed from the opposite end of the mandrel under a minimum tension which is maintained only long enough to remove the yarn from the mandrel and which is immediately relieved by depositing the yarn under no tension in a suitable container for further treatment. The yarn is deposited in such containers in a substantially uniform low density mass wherein linear segments of the yarn are arranged in an irreg…