A presentation On Silk Scouring

1. WELCOME TO OUR
PRESENTATION

2. SUBMITTED TO:
FATEMA TUJ JAHURA
LECTURER,
DEPARTMENT OF WET PROCESSING SUBMITTED BY :
NAME ID
DIPAK CHANDRA BARMAN 16061039
SUDARSAN BASAK 16061040
PROTTASHA PAUL 16061041
ABU RASEL 16061042
MD.MEHEDI HASAN APU 16061043
MD.JUBAYER IBN HARIS 16061044
MD.MUSTAFIZUR RAHMAN
16061046

3. WHAT DO YOU MEAN BY SILK FIBER?
• SILK IS A NATURAL PROTEIN FIBER,
SOME FORMS OF WHICH CAN BE
WOVEN INTO TEXTILES. THE PROTEIN
FIBER OF SILK IS COMPOSED MAINLY OF
FIBROIN AND IS PRODUCED BY CERTAIN
INSECT LARVAE TO FORM COCOONS
• THE SHIMMERING APPEARANCE OF SILK
IS DUE TO THE TRIANGULAR PRISM-LIKE
STRUCTURE OF THE SILK FIBRE, WHICH
ALLOWS SILK CLOTH TO REFRACT
INCOMING LIGHT AT DIFFERENT
ANGLES, THUS PRODUCING DIFFERENT
COLORS.

4. CONSTITUENT OF SILK FIBER
Fibrion 68-70%
Sericin 30%
Mineral
1-1.5%
Coloring Matter
Trace of wax,fats
0
20
40
60
80
Fibrion

5. COMPARISON BETWEEN SERICIN AND
FIBROIN
Amino acid
Componen
ts
Sericin Fibrion
Glycine 13.49 43.7
Alanine 5.97 28.8
Serine 33.43 11.9
Tyrosin 2.61 5.11

6. WHAT IS SILK SCOURING
• THE PROCESS OF REMOVING SERICIN AND OTHER IMPURITIES FROM THE
FIBRE
• MUST BE DONE SO THAT FIBRE CAN BE SPUN INTO YARN
• SERICIN IS A STICKY OR GUMMY SUBSTANCE, PRODUCED BY THE SILKWORM
• SERICIN HOLDS THE CONSTITUENTS OF SILK TOGETHER , SO BY REMOVING IT
OTHER IMPURITIES BECOME WEAK IN BOND

7. • THEN WE CAN EASILY AQUOUS WASH THEM
• THIS WHOLE PROCESS IS SILK SCOURING
• A VERY IMPORTANT PROCESS FOR SILK FIBRE PROCESSING

8. SILK SCOURING METHODS
• TRADITIONAL METHOD WITH SOAP
• DEGUMMING WITH DETERGENT
• ENZYMATIC DEGUMMING
• ACID DEGUMMING

9. TRADITIONAL METHOD WITH SOAP
THE TRADITIONAL METHOD WITH SOAP IS STILL
THE ONE MOSTLY USED, ESPECIALLY IN CHINA
AND INDIA. HOWEVER, SLOWLY THE PROCESSES
USING SYNTHETIC DETERGENTS OR ENZYMES
ARE BECOMING POPULAR. THE ADVANTAGE OF
SOAP DEGUMMING IS THAT AN ESPECIALLY SOFT
HANDLE IS PRODUCED. HOWEVER THE
TREATMENT TIME IS VERY LONG(2-6 HOURS) AND
PROLONGED TREATMENT MAY DAMAGE THE
MATERIAL CONTINUOUS. PROCESSING OF PIECE
GOODS IS HARDLY PRACTICABLE.

10. DEGUMMING
THE MAIN OBJECTIVES OF SILK
DEGUMMING IS TO IMPART SOFT
HANDLE AND LUSTER TO SILK BY
REMOVING SERICIN
THE PROCESS MAINLY CONSISTS OF
CLEAVAGE OF PEPTIDE BONDS OF
SERICIN BY HYDROLYTIC OR OTHER
METHODS AND SUBSEQUENT REMOVAL
FROM FIBRION BY SOLUBILIZATION IN
WATER

11. RECIPE OF DEGUMMING
•
WETTING AGENT……………………=0.5-1.0 G/L
SEQUESTERING AGENT……..……….=1.0-2.0 G/L
ANTIFOAMING AGENT……………...=0.5-1.0 G/L
SOAP…………………………..…….=15.0-30.0 G/L
TSP/SODA ASH………….…………..=1.0-3.0 G/L
DETERGENT…………………………..=1.0-3.0 G/L (NOT MANDATORY IF USE SODA)
TEMPERATURE…………….………….=90-95°C
TIME……………………….…………=90-120 MIN
PH……………………………………=9.5-10.5
M:L…………………………..………..=1:10

12. WORKING PROCEDURE
• SET THE BATH WITH SUBSTRATE AT ROOM TEMPERATURE AND ADD SOAP AND
OTHER NECESSARY AUXILIARIES.
• IF NECESSARY ADD TRISODIUM PHOSPHATE (TSP) OR SODA ASH TO MAINTAIN
DESIRED PH 9-10.
• RAISE THE TEMPERATURE TO 95° AND RUN FOR 2 HOURS FOR OPTIMUM
REMOVAL OF SERICIN GUM.
• COOL DOWN TO 70°C AND THEN DROP THE BATH.
• WASH IT WITH WARM AND COLD WATER SUCCESSIVELY

13. CONCLUSION