Lab-Scale Pad Steam Dyeing Machine
Pad Steam Dyeing Machine -Plato rage 60% to 100%
FabrSTheed Variable Speed Control
Dwelltime in steamer Dwell time Min. 20 Sec or lower – Max. 90 seconds or higher Pad Pneumatically-Controlled, Maximum pressure 1-6kg/cm or above, NBR rubber with 70o Shore Steami amber Insulated, Max. Temperature Max 100°C or higher., Pressure 0.5mPa or above
Display Digital display temperature indicator
Steam Generation External Steam Generator Included
Display Digital display of parameters
Width Min 500 mm or above
Washing compartments Min. 4, with direct steam heating and temperature regulator
Fabric take up/ batching system included
Parts to be included: IR pre dryer, Steaming chamber, Steam generator
Localized Holes-
Definition Pad Steam Dyeing Machine:
The chemical reaction between the knitting oils ( see section 2 I ), left on the fabric and the Hydrogen Peroxide which is used in the preparation stage of dyeing, at higher PH levels of 7 to 13, results in the weakening of the fibers in the oil stained areas. Read about Woven Fabric Jigger Machine
This weakening of the fibers will eventually, during the course of the dyeing process, cause localized and sporadic holes to appear.
Preventive Suggestions:
The use of water soluble knitting oils is strongly recommended.
Yarn lubricants, especially with open-end yarns, need to be checked to make sure the non-silicone types are used.
Corrective Measures:
For this problem no corrective measures are available.
Spandex Decomposition-
Definition and Causes:
The use of strong alkali in the preparation stage of the dyeing process and in Reactive dyeing systems where PH values of up to 13 are required is the main cause of the weakening, loss of elasticity and eventual breakage of Spandex yarns.
Preventive Suggestions:
When dealing with Spandex yarns, specifically the bare (uncovered) types and at finer counts, the use of strong alkali solutions must, to the extent possible, be avoided.
Corrective Measures:
For this problem no corrective measures are available.
Caustic Burns-
Definition and Causes:
This is caused by the sudden exposure of areas of the fabric to undiluted Sodium Hydroxide (caustic soda) during the dye process.
Here, due to the process of the partial “caustisization” that takes place, these areas, after dyeing, appear on the fabric as color intensified blotches.
Preventive Suggestions:
using a “dosing” system of delivery. Using this system, regulated and small pre-determined amounts of chemicals, at pre-determined rates, can be delivered to the dye machine.
This will prevent any possibility of fabric damage.
Corrective Measures:
For this problem no corrective measures are available.
Crease and Rope Marks-
Definition and Causes:
With medium and heavy weight fabrics, dyed in Jiggers or continuous dyeing range, the incomplete flattening and smoothing-out of greige goods’ wrinkles are the main causes of these problems.
With knit and light weight woven fabrics, dyed in the Jet dyeing systems, the main causes are as follows:
fabric tangle,
machine stoppage, especially at high temperatures,
over-loading the dye machine,
lack of correct lubricants (Fiber to Fiber and Fiber to Metal types need to be used)
incorrect fabric rotation speed
There are other causes but these are the most common ones.
Preventive Suggestions:
The use of correct dyeing process, considering all the technical aspects is essential.
Corrective Measures:
Generally, re-dyeing the fabric at higher temperatures and additional use of lubricants can remove the crease and rope lines.
For severe cases no corrective measures are available.
Metamerism-
Definition and Causes:
Metamerism is basically where the intensity and cast of a color appear to vary under different light sources.
This is, usually, due to the use of incompatible dyestuffs in creating a dye formula.
It could also be due to the presence of small particles of optical brighteners in the fibers.
Preventive Suggestions:
Correct dye selection is a critical factor in reducing this effect.
Corrective Measures – Pad Steam Dyeing Machine:
For this problem no corrective measures are available.
