A continuous synthetic filament yarn is processed by crimping, entangling, and straightening the yarn. The yarn is straightened by heating under tension, resulting in a yarn that can be used in its straightened form and later bulked by a subsequent process such as dyeing, boiling, heating etc. The length of a yarn plug formed by crimping is controlled by controlling the temperature of the yarn.
In processing thermoplastic yarn a value is monitored to determine whether said value is above or below a predetermined value. The monitored value is related to the denier of the yarn and associated with a yarn plug. The interval for the monitored value associated with said yarn plug to oscillate with respect to said predetermined value is timed and the yarn is processed in response thereto.
A twist-free continuous filament heather yarn of reduced streakiness and chevroning and muter appearance of the colors of the yarn making up the heather yarn when formed into a fabric is prepared by tensioning a plurality of twist-free crimped continuous filament yarns having a different color and/or dye receptivity in order to remove intra-yarn entanglement, passing the tensioned yarns side-by-side into a jet intermingling zone at a slower withdrawal rate from said zone. The heather yarn is characterized by substantially no twist between the yarns making up the heather yarn and by yarn-to-yarn randomly intermingled filaments forming blended areas of random length of filaments along the heather yarn randomly interspersed between unblended areas of random length along the yarn. The heather yarn is incorporated into a pile fabric.
Process and apparatus for crimping a filament yarn, the process employed comprising forcing a hot fluid entrained filament yarn into a stuffing chamber in one direction, forcing a cold fluid from an opposite direction into a staying control chamber located down stream of said stuffing chamber, exhausting said hot fluid from the stuffing chamber and exhausting said cold fluid from the staying control chamber respectively. The apparatus comprises a hot fluid jet nozzle having a hot fluid supply conduit connected thereto, a stuffing chamber having a hot fluid exit, a staying control chamber having a cold fluid exit, and a cold fluid supply device in said order.
The temperature of a heating fluid used in a yarn crimping zone is controlled in response to whether a yarn plug is detected at a predetermined point, and in another embodiment a fluid is heated, passed to a yarn heating zone and a yarn is heated in the zone in response to whether the yarn is being wound in a yarn winding zone.
The temperature of a heating fluid used in a yarn crimping zone is controlled in response to whether a yarn plug is detected at a predetermined point, and in another embodiment a fluid is heated, passed to a yarn heating zone and a yarn is heated in the zone in response to whether the yarn is being wound in a yarn winding zone.
