MY PROFILE

Name : Abdullah Al Mahfuj.Department : Textile. Program : B Sc in Textile Engineering ID : 142014007Green University of Bangladesh .

Name of My Presentation

Slasher/warp sheet Dyeing machine

INTRODUCTION

Slasher dyeing dyes the yarns in the warp beam form. It is a continuous process which combines dyeing & sizing in a single operation.

In Slasher dyeing warp yarns are repeatedly passed in warp beam form through several baths of indigo (Indigo is a blue Vet dye ,) before being sized and wound for weaving.

Process Sequence in Indigo Slasher / Sheet Dyeing:

Wrapper Beam Let-off (8/16 warp beam and 400 Ends)↓ Yarn Accumulator↓ Pre-Treatment↓ Washing ↓ pre-Drying ↓ Dyeing↓ Washing ↓ pre-Drying↓ Sizing ↓

↓ yarn Splitting↓ Yarn Accumulator ↓Take-off weavers Beam

Warper’s Beam Let-off

a typical slasher machine usually has a creel capacity with 8-16 Wrapper's beam.

practically 12-14 beams are used with 350-400 ends

There is always a standby creel to ready to replace the creel.

There are two creels' can be moved left and right by using creel track.

Yarn accumulatorHere extra warp sheet are stored when the

empty wrapper's beam are replaced with the new set beams

Pretreatment

• Pre-treatment process in sheet dyeing consists of treatment of the cotton yarn sheet with caustic and wetting agent

• the yarns are treated with strong caustic soda solution followed by hot wash and cold wash treatment prior to dyeing. The pH of the bath is 11.8-12

Washing Scoured warp sheet is washed in two

consecutive washing bath

Cold washing is carried out at room temperature.

Pre-Dyeing The washed warp sheet is squeezed and

partially dried before entering into dye bath to absorb more dye liquor.

Dyeing The m/c manufacture supply 4-10 bath up having 400-800

Ltr bath capacity

After emerging from dye bath the warp sheet pass through a set of roller having is passage of 20-35m to get c

for quick oxidation hot air (40-50 degree Celsius) are used

all the dye bath are interconnected by the pipe line .

Washing The dyed yarn sheet is subsequently in order

to remove the unfix dye from the yarn surface. However the number of washing tank may vary. Typical wash type is cold wash at room temperature and hot wash at temperature of 70ºC.

Sizing there a size application box heaving capacityOf 300-500 liters The size box connected to a size reservoir Tank placed on the at last 10 feet high plat or

roof The size liquor is transferred to the size

reservoir tank via pump

Dryers The sized yarns are dried passing the warp

sheet to a series of teflon coated roller heated .

ADVANTAGES OF SLASHER DYEINGTHE TECNOLOGY IS LESS CAPITAL INTENSIVE.

THE TECCNOLOGY IS PROVEN ON.

THE COST OF PRODUCTION IS LOWER.

THE PROCESS TIME IS LOWER.

THE SHEET DYEING MACHINES ARE VERY EASY TO OPERATE.