Tank for washing a warp thread

1. A tank for washing a warp thread through a washing liquid, comprising a device for intensifying the washing effect of said warp thread, each device being configured to be set in rotation inside said tank and consisting of a body having cylindrical geometry with a circular cross section that comprises:

a plurality of longitudinal bars, arranged along the cylindrical side surface of each device, a longitudinal slit being defined between each pair of adjacent bars;

a pair of end elements extending radially, forming the opposite bases of said body having cylindrical geometry, said end elements being configured to support and enclose said bars;

a pair of opposite rotation pins, obtained on the respective outer surfaces of said end elements, said rotation pins extending along an axial direction and parallel to the direction of extension of said bars; and

a tangential turbodynamic flow generator, arranged inside said body having cylindrical geometry and configured to intensify the interchange between the washing liquid and the warp thread through said longitudinal slits during the rotation of each device,

wherein each bar of each device has a circular shape in cross section, so as not to break down a configuration of the warp thread, avoiding overlapping of respective threads.

2. The tank according to claim 1 , wherein each longitudinal slit has a length substantially equal to the length of said bars.

3. The tank according to claim 1 , wherein said end elements are made in the shape of circular plates.

4. The tank according to claim 3 , wherein said bars are joined to the respective end elements close to the circumferential edges of said end elements.

5. The tank according to claim 1 , wherein the tangential turbodynamic flow generator consists of a rotor provided with one or more blades arranged longitudinally inside said body having cylindrical geometry, said rotor being integral with said end elements.

6. The tank according to claim 5 , wherein each blade has a length in the longitudinal direction substantially equal to the length of each of said bars.

7. The tank according to claim 5 , wherein each blade has a profile in cross section shaped like an arc of circumference, suitable for generating a predetermined thrust on the washing liquid, and has a width in the radial direction that is substantially equal to the radius of the directrix circumference of said body having cylindrical geometry so that, for each complete revolution of each device around the respective rotation pins, said blades are capable of expelling the entire volume of washing liquid contained inside said body having cylindrical geometry.

8. The tank according to claim 1 , further comprising:

a guide roller, configured to convey the warp thread inside said tank so that said warp thread is immersed in the washing liquid for a predetermined length portion thereof;

two or more motorized wringing cylinders, positioned above said tank and through which said warp thread passes;

wherein each device is immersed in the washing liquid and is configured to define a guided path for the warp thread inside said washing liquid when said warp thread, moved by said two or more motorized wringing cylinders, winds at least partially around each device.

9. The tank according to claim 8 , wherein said two or more motorized wringing cylinders are configured to apply an adjustable pressure on said warp thread, so as to eliminate at least part of the washing liquid that impregnates said warp thread exiting from said tank.

10. The tank according to claim 9 , further comprising a spraying group for spraying the warp thread, arranged upstream of said two or more wringing cylinders and hydraulically connected to a feeding pipe for the washing liquid.

11. The tank according to claim 10 , further comprising a flow meter and an overflow duct arranged at the upper edge of said tank, said overflow duct being configured to keep the amount of washing liquid contained in said tank constant and being sized to discharge from said tank an amount of washing liquid greater than the maximum flow rate that can be fed with said flow meter.