Thermosole Dyeing Machine
Thermosole Variable Speed Control
NBR rubber with 70o shore, 0.1 0.5mPa, 2 pressure gauges, Total trough capacity 500m1, vapour-pressure type Min. 500 mm
Maximum Temperature 250°C or above
Infraredjeating system Min. 12 reflect-type IR heaters, Heating distance 800 – 900mm or above,Fabric distance 70-120 mrr (adjustable)
Thermosoling 1500mm or above, 250°C or above, Precision ± 1%.
Dryer Drying distance 1800mm or above, Temperature 100 180°C,
Fabric take up/ batching system included Circulation air speed Min 4 m/s or lower — Max. 15 m/s or higher. Read also Woven Fabric Jigger Machine
Chafe Marks-
Definition and Causes:
This defect appears on the fabric as longitudinal crushed and discolored areas.
It is normally caused by the sudden stoppage of the fabric’s movement and rotation during the dye process.
Preventive Suggestions:
To the extent possible, the stoppage of fabric’s movement and rotation must be kept to the minimum.
Corrective Measures:
For this problem no corrective measures are available.
Salt and Mineral Deposits-
Definition and Causes:
In certain dye procedures, particularly Reactive, a large amount of Sodium sulfate and other types of salts are used to facilitate and assist the dye absorption and exhaustion.
Insufficient washing and rinsing during the final stages of the dyeing process will result in accumulation of white powdery residues on the fabric.
Preventive Suggestions:
A thorough rinsing of the fabric in the last stage of dyeing using a strong sequestering chemical is always recommended, particularly when more than 6 grams/liter salts are used.
Corrective Measures:
With dyed fabrics that exhibit these types of contaminated areas, a sequestering based rewash process will correct the problem.
Excessive Surface Shine (Luster) and Moiré (Water Mark)-
Definition and Causes:
Intensified, visible, and uniform reflection of light from the surface of a fabric is referred to as Luster.
In a non uniform and random pattern this effect is known as Moiré or Water mark.
This problem occurs mainly on fabrics made of synthetic textured filament yarns and is mainly due to a very small displacement of fibers within the loops and stitches.
This principle is sometimes used to create the water mark effect on certain silk fabrics using Calendaring equipments.
Preventive Suggestions:
To the extent possible, synthetic fabrics that are more susceptible to having this problem must be processed at a relaxed and tension free environment.
Corrective Measures:
The excessive shiny surfaces and the Moiré can not be totally removed. However, by reducing and inhibiting the light reflection this effect can be minimized.
To achieve this, a microscopic layer of a dulling chemical, (usually Titanium Dioxide), is padded on to the surface of the fabric in the finishing stage.
This chemical, however, will affect the softness of the fabric and should be used in small quantities.
Color Change Due to Incorrect Drying Temperature-
Definition and Causes:
Uneven or excessive application of heat on to the surface of the fabric during the drying process may cause one or a combination of the following:
One side of the fabric to have a different shade. This is due to the malfunction of the heating chambers circulation mechanism
Complete and overall change of shade and/or cast. This is due to the fact that in making the dye formulation certain “heat-sensitive” dyes are used
Partial removal of color. This is due to the process of sublimation
Yellowing of white color due to scorching and the use of incorrect softeners
Preventive Suggestions:
Prior to the start of the finishing process the following need to be established:
The types of dyed used in the dyeing process with regards to their temperature threshold
The fabric type and selecting the appropriate temperature range
Side-center-side temperature variation using heat-sensitive strips
Corrective Measures:
In most cases re-bleaching or re-dyeing will correct the problem.
Sublimation-
Definition and Causes:
The separation of the surface dyes in a gaseous state off of the fabric and their transfer or relocation on to another surface in a solid form is referred to as dye sublimation.
During the drying process, if a light color is dried in the same machine, after a darker color, the darker dyes (in a gaseous form) that may have remained in the machine can get redeposited on to the lighter color (in solid form) causing blotchiness or discoloration.
Preventive Suggestions Thermosole :
During the drying process care must be taken to ensure that, to the extent possible, fabrics of same or similar shades are dried in succession.