Heating apparatus for heating an advancing synthetic filament yarn

An apparatus for concurrently heating a pair of advancing yarns comprising

• an elongate rail which extends in a longitudinal direction, said rail including a pair of longitudinally extending and parallel grooves formed therein so as to define a partition wall positioned between said grooves and two outer side walls, and with said grooves each including a generally flat yarn contact surface along at least a part of the longitudinal length thereof, and
• a plurality of yarn guide members mounted in a longitudinally spaced apart and interdigitally disposed arrangement along the length of each of said grooves for engaging opposite sides of an advancing yarn and guiding the advancing yarn along and in contact with the yarn contact surface in a laterally zigzagged path of travel.

An apparatus for heating an advancing yarn, comprising

• an elongate rail which extends in a longitudinal direction and which comprises a first longitudinal segment which includes a generally flat yarn contact surface and a second longitudinal segment which is characterized by the absence of a yarn contact surface, and
• yarn guide means comprising a plurality of guide members mounted in a longitudinally spaced apart and interdigitally disposed arrangement along the length of said rail for engaging opposite sides of an advancing yarn and guiding the advancing yarn along and in contact with the yarn contact surface in a laterally zigzagged path of travel during passage through said first longitudinal segment, and for engaging opposite sides of the advancing yarn and guiding the advancing yarn in a laterally zigzagged path of travel which is adjacent but spaced from the surface of the rail during passage through said second longitudinal segment.

A yarn false twist crimping machine for processing synthetic yarn and comprising

• yarn heating means, yarn cooling means, yarn false twisting means, means for advancing a yarn serially through said yarn heating means, said yarn cooling means, and said yarn false twisting means, and means for winding the processed yarn into a package,
• said yarn heating means comprising an elongate rail which extends in a longitudinal direction and which includes a generally flat yarn contact surface, and yarn guide means comprising a plurality of guide members mounted in a longitudinally spaced apart and interdigitally disposed arrangement along the length of said rail for engaging opposite sides of an advancing yarn and guiding the advancing yarn along and in contact with the yarn contact surface in a laterally zigzagged path of travel.