Quantifying Wet Spinning Limits for Low Cohesion Bast Fiber Slivers
Low cohesion flax slivers collapse under high draft ratios, requiring reduced trough temperatures, higher roving twist, and tight ratch settings to hold count.
Flyer Spinning Frame
Mechanical Design
Industrial spinning equipment designed for processing long-staple fibres utilizes a spindle-mounted guide arm to concurrently twist and wind the yarn package. This specialized machine, known as a flyer spinning frame, is widely used for producing high-strength flax yarns and roves. The frame incorporates drafting rollers, spindles, and U-shaped flyers that rotate at high speeds to insert twist into the drafted flax strand.
It is particularly suited for wet spinning where robust mechanical control of the damp yarn is necessary.
Twisting Operation
Insertion of twist occurs as the drafted flax strand passes from the delivery rollers through the hollow top of the spindle and down the flyer arm. In the flyer spinning frame, the rotation of the flyer inserts a defined number of turns per meter into the yarn before it is wound. This dual action of twisting and winding requires precise synchronization between the spindle speed and the flyer speed.
Twist distribution remains highly uniform. Slip of the drive belts or variations in spindle speed can introduce defects that weaken the final linen thread.
Bobbin Accumulation
Winding the twisted yarn onto the bobbin is controlled by a friction brake that adjusts the speed of the bobbin relative to the flyer. Because the flyer spinning frame must maintain a constant winding tension as the package grows, the bobbin lift must move continuously to lay the yarn in uniform layers. This process ceases when the bobbin is full.