This document provides details about Abdullah Al Mahfuj's slasher dyeing machine presentation. It introduces slasher dyeing as a continuous process that dyes and sizes warp yarns in one operation by repeatedly passing the yarns through indigo dye baths before winding. It then outlines the key steps in slasher dyeing: warp beam let-off, yarn accumulation, pre-treatment, washing, pre-drying, dyeing, washing again, sizing, drying, and winding onto a take-up beam. Advantages are that slasher dyeing is less capital intensive, proven technology, lower production costs, shorter process time, and easy to operate machines.

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

3. Name of My Presentation
Slasher/warp sheet
Dyeing machine

4. 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.

5. 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

6. 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.

7. Yarn accumulator
Here extra warp sheet are stored when
the empty wrapper's beam are replaced
with the new set beams

8. 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

9. Washing
 Scoured warp sheet is washed in two
consecutive washing bath
 Cold washing is carried out at room
temperature.

10. Pre-Dyeing
 The washed warp sheet is squeezed and
partially dried before entering into dye bath to
absorb more dye liquor.

11. 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 .

12. 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.

13. Sizing
 there a size application box heaving capacity
Of 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

14. Dryers
 The sized yarns are dried passing the warp
sheet to a series of teflon coated roller
heated .

15. ADVANTAGES OF SLASHER DYEING
THE 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.