Recent development in pigment printing and dyeing:
List of members: Md. Ashraful Alam (033-038-041) Abdur Rahman (041-016-041) Md. Zahirul Islam (041-035-
041) Ariful Haque Zoarder (041-040-041) BM. Shafiul Islam (041-060-041) Md. Amir Hamzah (042-031-041)
Contents: Pigment printing method Advantages of electron beam irradiation
method over the conventional thermal printing method
Comparison between Conventional and developed printing recipes
Effect of Defoaming Agent Dyeing of Cotton Fabric with Pigment Emulsion
Pigment printing can be defined as: ”Insoluble pigments, which have no affinity for the fibre, are fixed onto the textile substrate with a binding agent in the pattern required”.
RECENT DEVELOPMENTS IN PIGMENT PRINTING
Pigment printing method:
Electron beam irradiation method (Recently developed)
Conventional thermal printing method
Electron beam irradiation method A process of accelerating electrons with
a voltage applied thereto in a vacuum, guiding the accelerated electrons into a normal-pressure atmosphere, and irradiating the electron beam (EB) onto an object. The electron beam irradiation process uses a vacuum tube-type electron beam irradiation apparatus, and with the acceleration voltage for generating an electron beam set at a value smaller than 100 kV, the electron beam is irradiated onto the object.
Advantages of electron beam irradiation method over the conventional thermal
It shows higher color strength than those fabrics printed by the conventional process.
The color strength on cotton fabrics printed with the Imperon violet, blue and yellow pigment colors was 85.2, 75.4 and 91.3 in the case of printing with electron beam and 63.5, 46.0 and 50.2 in the case of thermal printing respectively.
Comparison between conventional and modern printing recipe:
DEFOAMING AGENTS NON SILICONE TYPE: Antifoam NS Non-silicone defoamer.
Prevents or reduces foam in all dyeing, printing and finishing processes. Cold water dispersible.
Antifoam PJ New High quality non-silicone defoamer. Prevents or reduces foaming all dyeing, printing and finishing processes. Suitable for high turbolence systems. (Jet...).
SILICONE TYPE: Antifoam R100 A silicone emulsion for
use in antifoaming and defoaming in a wide range of textile applications. It is effective in preventing foam buildup in an open beck.
Antifoam R200 A more concentrated form of ANTIFOAM R 100.
The dyeing of cotton fabric with pigment or fluorescent pigment emulsions (usually applied for printing) is an easy operation, employing their respective binders. A recipe for dyeing cotton fabric with acramin pigment emulsions is mentioned below:
The material is padded with the padding liquor (prepared as above) and then dried and cured at 145-150°c temperature. The padding may be carried out on a three bowl, double nip pneumatic padding mangle. Padded material is dried on a hot flue or float drier machine intandem with the padding mangle. After drying material is cure don a curing machine. The sequence of operations is shown in figure: