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Jet dyeing
 

Jet dyeing

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    Jet dyeing Jet dyeing Presentation Transcript

    • JET DYEING SUBMITTED TO: PRESENTATION MISS ALKA BHARTI SUBMITTED BY: AMRITA RASTOGI BFAD IVth SEM
    • INTRODUCTION Jet dye machine is the most modern machine used for dyeing of polyester using disperse dye. It is similar to winch dyeing and fabric is processed in continuous loop. The technique is especially useful for delicate polyester fabrics but depending on the machine almost any weight, structure, or fabric type can be used.
    • It was found that in using Winch machines, there were some inherent problems. So the Jet dyeing machines when they came up in the 1970's, were specifically designed to overcome those shortcomings. In this machine the dye tank contains disperse dye, dispersing agent, leveling agent and acetic acid. Fabric may be jet dyed by placing it in a heated tube or column where jets of dye solution are forced through it at pressure up to 300 pounds per jet.
    • DYEING PROCESS In the Jet dyeing machine the reel is completely eliminated. A closed tubular system exists where the fabric is placed. For transporting the fabric through the tube a jet of dye liquor is supplied through a venturi. The Jet creates turbulence. This helps in dye penetration along with preventing the fabric from touching the walls of the tube. As the fabric is often exposed to comparatively higher concentrations of liquor within the transport tube, so little dye bath is needed in the bottom of the vessel. This is just enough for the smooth movement from rear to front. Aqueous jet dyeing machines generally employs a driven winch reel along with a jet nozzle.
    • JET DYEING MACHINE
    • MACHINERY PROCESS • The solution is filled in the dye tank and it reaches the heat exchanger where solution can be heated which then pass onto the centrifugal pump and then to the filter chamber. • The solution will be filtered and reaches the tubular chamber. Here the material to dye will be loaded and the winch is rotated so that the material is also rotated. • Again the dye liquor reaches the heat exchanger and operation is repeated for 20-30 minute at 135°C. • Then dye bath is cooled down, after material is taken out.
    • SPECIAL FEATURES AND APPLICATION • This machine can be operated at high temperature and pressure . • This system operate at low liquor ratio (ratio of mass of dye bath to mass of fabric in dyeing machine) so, this operation consume less water and chemical. • Frequent movement of fabric round the jet through the machine reduces the tendency of crease formations.
    • TYPES OF JET DYEING MACHINE • After incest fating the dyeing results under different conditions such as development of new fiber blends, different construction fabrics, interaction position of jet, quantity of the dye liquor to be present in around the fabric and the type of impact of the dye liquor on the fabric in the jet area. Some Jet dye machines are as follows: • Overflow Dyeing Machine • Soft-flow Dyeing Machine • Airflow Dyeing Machine
    • ADVANTAGES OF JET DYEING MACHINE • Dyeing time is short compare to beam dyeing • Production is high compare to beam dyeing machine. • Low consumption of water. • Short dyeing time. • Can be easily operated at high temperatures and pressure. • Comparatively low liquor ratios, typically ranges between 1:4 and 1:20. • Fabrics are handled carefully and gently.
    • DISADVANTAGES OF JET DYEING MACHINE • Cloth is dyed in rope form so there risk of entanglement and chance crease formation. • Equipment and maintenance costs high, foaming can be a problem, some fabric may be abraded in process. • Chance for crease formation. is a for are and the
    • LIMITATIONS OF JET DYEING MACHINE • High initial investment and maintenance cost. • Limited accessibility during the dyeing process. • Foam forming substance is to be avoided. • Any roughness of the inside surface cause damage to cloth. • In case cloth breakage, re-threading is complicated.
    • THANKYOU