A back twister machine, also known as a back twisting machine, is a piece of equipment used in the textile industry to twist yarns or threads in the opposite direction to remove the twist or create a desired effect. This machine is commonly used in the production of fabrics, ropes, and other textile products.

Here are some key features and specifications of a back twister machine based on the search results:

Usage: Back twister machines are dedicated to CAT cables (such as CAT 5, CAT 5e, CAT 6, CAT 6a) pair twist+back twist [1].

Pair Twisting Machine: The pair twisting part of the machine has the following specifications:

Inlet wire diameter: 0.4-1.5mm
Step-less speed regulation by electrical setting
Pitch range: 4.96-39.64mm, pitch change by changing plastic gears (or digital setup optional)
Twisting direction: Available for left or right (S-Z)
Take-up bobbin size: φ50056300mm
Take-up capacity: <250kg
Traverse way: By polished rod
Center height: 775mm
Bearings: KOYO or NSK from Japan
Main motor: 5HP frequency Siemens motor, controlled by Inovance inverter
Rotation: Max 2500 RPM
Drums lifting by pneumatic device and locking by mechanical manual [1].
Back Twisting Machine: The back twisting part of the machine has the following specifications:

Rotary bow by 4HP Siemens motor, controlled by Inovance inverter
Pay-off driven motor by 0.55kw Siemens motor, controlled by vectorial Inovance inverter
Suitable reel size: φ50056300mm
Rotation of twisting bow: Max 1050 RPM
Bobbin locking by mechanical manual way for safety and reliability
Transmission by timer belt in high accuracy with lower noise
Loading capacity: Max 200kg/reel
Pay-off tension: 3-10N
Back-twist ratio: 0-50%
With wire reserve device for stable tension
Function of wire broken alarming/stop and over tension [1].
Basic Information:

Operation direction: From right to left (or customized)
Occupied areas: 6.82.12.5m (LWH)
Power supply: 380V, 3P, 50Hz
Appearance color: Sky-blue or customized