• The opening roller is arranged co-axially with rotor.•

• Proves  better for long staple Fibres spinning.•

• Proves better for short  staple Fibres spinning.

• There is air frictional losses only on one side of rotor & opening roller.•

• •There is air frictional losses on both sides of rotor & opening roller.•

• 35% less energy consumption.

• 35% more energy consumption.•.

• •Comparatively less  draw - off tension.•

• High draw off tension which limits performance.

• Fibres are always under control while passage from opening roller to rotor .•

• •Passage of fibres in long conduction channel from opening roller to rotor.•

• Fibres are fed in the form of web

• Individual fibres are fed

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