Solutions to improve productivity and reduce waste for thread tractors

The solution for synchronous control of the tractor system speed by using INVT GD200A multi-function inverter. The solution not only increases productivity, product quality, protects equipment engines, but also reduces machine downtime, helping to increase efficiency for enterprises.

Pulling machine is just a device that performs the first step in the PP bag production process. Plastic granules are extruded through the extrusion roller to the mouth of the mold, then passed through the cold water tank to form a thin film, cut into fibers to increase heat and stretch, increase the heat to recover, shape, and be flattened as required and according to winding into skeins of yarn for PP knife weaving machines.

The old-style operating method, the pulley, pull-out, 8-spool and roll-collector motors use VS or DC motors and are directly started by the grid.


  • The system is asynchronous, prone to thread breakage, creating a lot of waste, increasing machine downtime.
  • Direct-start motor causes factory voltage drop, affecting equipment life
  • Difficult to operate, difficult to change orders
  • Often stuck, time consuming for maintenance
  • The machine vibrates when operating, causing only unstable elasticity and easy breakage.


The INVT inverter adjusts the speed to create a synchronous connection for component motors such as extruders, film clamps, 8-tube batches, coils and reels, etc. The operator only needs to adjust the synchronous speed once for each product, then adjust the speed of the machine through the total rheostat.


  • Synchronized system, easy to operate
  • Increase productivity and product quality
  • Reduce maintenance and service time
  • Engine and mechanical protection
  • Energy saving due to proper operation of the motor
  • Complete solution, quick and easy installation. 27/4 service
Are you still hesitant, worried about efficiency?
Take a look at DAT's specialized solution design process.

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Products for solutions

GD20 - versatile, compact, easy-to-use open-loop inverter series with outstanding responsiveness for almost all applications.
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GD200A - inverter is designed for both heavy loads (constant torque – G load) and variable loads (fan pump – P load).
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GD350 - INVT's most advanced multi-function inverter series with world leading vector control technology, meeting diverse control requirements with high efficiency.
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GD35 - advanced closed-loop vector control with 7 control modes: speed, position, torque, speed/torque, position/speed, position/torque and speed control full closed loop control.
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