90 QUESTIONS OF
GARMENTS WASHING
&
DYEING
TÀI LIỆU: 90 CÂU HỎI CẦN LƯU Ý KHI
TÌM HIỂU VỀ NHUỘM VÀ WASH TRONG
NGÀNH MAY MẶC THỜI TRANG
90
QUESTIONS OF GARMENTS WASHING &
DYEING.
1. DEFINITION OF GARMENT WASHING.
The technology which is used to modify the appearance, outlook
comfort ability and fashion of the garments is called garment washing.
Depending on garments construction different types of washing
process can be done.
Twill/Canvas/Knitted/Corduroy - Normal wash, Pigment wash, Caustic
,Si wash
Denim/Jeans/Gabardine - Enzyme wash, Stone wash, Bleach wash ,
Acid wash
Grey fabric- Super white wash
2. WRITE THE PURPOSE OF WASHING.
Garment washing is the best touch of a garment.
Same type of garments can produce several effects for several wash
Like this:
To create wash look appearance, seems the new touch of fashion.
By the washing technique, faded/old, color or tinted affect .
Washing technique creates new fashion such as tagging, grinding,
destroy, blasting, whickering, permanent wrinkle, deep dye, tie dye, p.p
spray, hand crapping, p.p spoonzing etc.
To reduce size materials that imports soft hand feels.
To attraction the customers/buyer by different types of fashionable
washing and market development.
Due to washing, shrinkage occurs in the garments. There is no
possibility of further shrinkage of the wash garments.
Any dirt, spot or germ if added in the garments during manufacturing
is also removed due to washing.
3. WRITE DIFFERENT TYPES OF DRY PROCESSING.
Hand scrapping
3D whiskering
Broken
Tagging
Wrinkle (Permanent & Overall)
Grinding (Hem,Pocket,Coller,Cuff)
Destroy
PP spray & PP sponging.
4. WRITE DIFFERENT TYPES OF WET PROCESSING.
Normal wash/ garment wash/rinse wash
Pigment wash
Caustic wash
Enzyme wash
Stone wash
Stone enzyme wash
Tinting (Tie) & Over Dyeing(Dip Dyeing)
Super white wash
Bleach wash
Acid wash
Silicon wash
5. WRITE THE MACHINE NAMES WHICH ARE USED IN WASHING PLANT.
Sample washing machine ( horizontal/vertical)
Washing machine
Washing machine
Hydro extractor machine
Dryer machine
Dryer machine
Chemical mixture machine
Industrial oven
Boiler
Submersible pump
Grinding machine
Tagging machine
Steam chamber for crinkle
E.T.P
Generator
Sand blasting gun
Sand blasting chamber
Spray gun and dummy
Screw compressor
6. WRITE THE CHEMICAL NAMES WHICH ARE USED IN WASHING PLANT.
Enzyme
Acetic acid [CH3-COOH]
Detergent
Ant staining agent
Bleaching powder [Ca(OCl)CL]
Sodium hyposulfite [Na2S2O2]
Caustic soda [NAOH]
Soda ash [Na2CO3]
Sodium bicarbonate [NaHCO3]
Potassium permanganate [KMnO4]
Cationic/ nonionic flax softener
Micro emulsion silicon
Salt
Buffer
Hydrogen peroxide [H202]
Stabilizer
Fixing agent
Catanizer
Optical brightner
Resin
Sodium metabisulphite [Na2S2O5 ]
Desizing agent.
7. WHAT IS THE PURPOSE OF NORMAL WASH?
To remove dust, dirt, oil spot, impurities from the garments.
To remove starch presents on the garment fabrics.
For soft feeling to wear the garments after purchasing.
To achieve buyer washing standard.
8. WHAT IS THE FUNCTION OF HYDRO EXTRACTOR MACHINE?
The function of hydro extractor machine removes excess water from the
washed garments.
9. DESCRIBE THE 1ST STEP AND 2ND STEP OF NORMAL/GARMENT WASH/RINSE WASH.
First step
Lot size…………………70 kg twill/canvas garment
Add water, L:R= 1:8-10…….560-700 liter
Machine running
Add detergent, 0.5 gm/liter…………..280-350gm
Temperature………….sometime cold and sometime 40∙c to 60∙c
Time………………….5 to 10 minutes
Drop the liquor
Cold wash.
Second step
Add water, L:R= 1:6…….…….420 liter
Washing machine running
Add Fax softener, 0.6 gm/liter…………..252 gm
Add acetic acid, 0.5gm/liter……………..210 gm
Time………………….5 to 10 minutes
Drop the liquor
Unload the garments on trolley.
10. WHAT IS THE PURPOSE OF SILICON WASH?
To give durable softness and elastic handle properties.
To increase anti pilling affects, dimensional stability and tear
resistance.
To improve wear and easy care properties.
11. WRITE DIFFERENT BETWEEN NORMAL WASH AND SILICON WASH.
Normal wash
To remove dust, dirt, oil spot, impurities from
the garments.
Silicon wash
To give durable softness and elastic handle
properties.
To remove starch presents on the garment
fabrics.
For soft feeling to wear the garments after
purchasing.
To achieve buyer washing standard.
To increase anti pilling affects and dimensional
stability.
To increase tear resistance property.
To improve wear and easy care properties
12. DESCRIBE THE DESIZING PROCESS OF SILICON WASH.
Lot weight (Approx 125 pes) ............ 60 kg.
Add water @ L: R = 1: 10.............. 600 Liter
Machine Running.
Add Desizing agent @ 0.6 gm / litre ............ 360 gm.
Add Detergent @ 0.5 gm / litre.................... 300 gm.
Temperature.......................... 50°c.
Time...............................10-20 mts.
Drop the liquor.
Rinse one time 3 minutes.
13. DESCRIBE THE SOFTENING PROCESS OF SILICON WASH.
The softening=DESIZING
Lot weight (Approx 125 pes) ............ 60 kg.
Add water @ L: R = 1: 10.............. 600 Liter
Machine Running.
Add Desizing agent @ 0.6 gm / litre ............ 360 gm.
Add Detergent @ 0.5 gm / litre.................... 300 gm.
Temperature.......................... 50°c.
Time...............................10-20 mts.
Drop the liquor.
Rinse one time 3 minutes.
14. WRITE THE CHEMICALS NAME WHICH ARE USED FOR PIGMENT/CAUSTIC WASH PROCESS.
1.Caustic soda
2.Soda ash
3.Detergent
4. Acetic acid
5. Flax softener
6. Silicon
15. WRITE THE CHEMICALS NAME WHICH ARE USED FOR ENZYME WASH.
Desizing agent
Detergent
Anti back staining agent
Acetic acid
Cationic softener
Chlorine bleach
Soda ash
Sodium hypo sulphite
Sodium bi carbonate
Silicon.
16. WRITE THE DESIZING/ FIRST STEP OF CAUSTIC WASH PROCESS.
Lot size: - ...................... 80 kg.
Add water @ L : R = 1 : 8.............. 640 Liter
Machine Running.
Add Caustic soda (NAOH)..... @ 1.60 gm / litre........ 1024 gm.
Add Detergent ........................ @ 0.8 gm / litre ............ 512 gm.
Temperature........... 50°c to 60°c.
Time (Depend upon the shade) ....... 20 to 60 mts.
Drop the liquor.
Wash cold water for 3 mts.
17. WHAT IS THE STANDARD R.P.M OF WASHING MACHINE?
(28-35) RPM
18. WRITE THE CHEMICALS NAME WHICH ARE USED FOR SOFTNESS OF GARMENTS.
Cationic softener
Silicon
Enzyme
19. WRITE THE CHEMICALS NAME WHICH ARE USED FOR GOOD QUALITY HAND FEEL.
Cationic softener
Silicon
Enzyme
20. WHAT CHEMICAL USE IS FOR PROTECT STAINING/BLEEDING ON GARMENTS.
Anti-back staining agent
21. WHAT PROCESS IS DOING FOR REMOVE STARCH/SIZING MATERIALS FROM THE
GARMENTS?
Desizing process
22. WHY ACETIC ACID IS USED IN ENZYME BATH?
Acetic acid is used in enzyme bath to neutralize the garments
from alkaline condition and to control the ph value of the bath.
Then acid enzyme is given in enzyme wash.
23. WRITE DIFFERENT BETWEEN STEAM DRYER & GAS DRYER.
Steam dryer
Gas dryer
High production rate.
Low production rate.
Generally light garments, white Generally heavy garments
are
used for dry.
coloured garments are dried
May be form yellowish effect
No risk of yellowish formation.
on the garments.
24. DESCRIBE THE DESIZING PROCESS OF DENIM LONG PANT.
Lot weight (80 pes) ............ 60 kg denim long pant.
Add water @ L : R = 1 : 9 .............. 540 Liter
Machine Running.
Temperature.......................... 60°c.
Add Desizing agent @ 0.6 gm / litre ............ 324 gm.
Add Detergent @ 0.8 gm / litre.................... 432 gm.
Time...............................10-- 20 mts.
Drop the liquor.
Wash 1 time by cold water.
25. DESCRIBE THE ENZYME BATH PROCESS OF DENIM LONG PANT BY ACID ENZYME.
Add water @ L : R = 1 : 8 .............. 450 Liter
Temperature.......................... 45°c.
Add Acetic Acid @ 0.6 gm / litre ................... 270 gm.
Add Anti back staining @ 0.6 gm / litre........ 270 gm.
Add Acid Enzyme @ 2.00 gm / litre ................ 900 gm.
Time.............. (Depend upon the shade )...40--60 mts.
Increase temperature to 90°c and run 1 minute (enzyme
killing).
Drain the bath. Rinse Twice, each 3 minutes.
26. DESCRIBE THE ENZYME BATH PROCESS OF DENIM LONG PANT BY NEUTRAL ENZYME.
Add water at, L: R = 1: 8.............. 480Liter
Temperature................................ 45°c.,
Add Acetic Acid at 0.3 gm / liter..... 135CC
Add Anti Back staining at 0.6 gm / liter ... 270 gm.
Add Neutral Enzyme at 2.00 gm / liter ... 900 gm.
Time... (Depend upon the shade)….40- 80 min.
Increase temperature to 90°c and run 1 minute (enzyme killing).
Drain the bath.
Rinse Twice, each 3 minutes.
27. HOW CAN DO THE KILLING OF ENZYME IN ENZYME BATH?
For killing of enzyme in enzyme bath the temperature is increased to 900c
and run for 1 minute.
Or,
By using ENZYME KILLER.
28. WHY CHLORINE BLEACH IS USE IN DENIM WET PROCESSING?
Chlorine bleach is use in denim wet processing for the better bleach
action on garments. Because we know that chlorine has strong bleaching
power. So that it can easily create bleaching effect on garments.
29. WHAT CHEMICALS IS USE FOR NEUTRALIZATION OF CHLORINE BLEACH?
Sodium hypo sulphite (Na2S2O2)
30. WRITE THE MAIN 5 FUNCTIONS OF ENZYME WASH.
Develop ‘’Bio-polishing’’ affect on denim in echo-friendly way
Enzyme improves the ‘’Anti-pilling’’ properties.
It attacks more the surface of the fabrics and gives a very smooth
surface.
It increases the color fastness and rubbing fastness properties.
Achieve high-low abrasion to produce fading effect in sewing area.
31. WHAT IS THE ACTION OF ENZYME ON GARMENTS?
It just hydrolysis the cellulose, first it attacks the projecting fiber then
the yarn portion inside fabric and faded affect is produced.
It reduces GSM of the garment.
It produces buyer loving soft feel in use.
32. WHAT IS THE STANDARD TIME FOR BLEACHING IN BLEACHING BATH OF DENIM
GARMENTS?
(15-25) mts
33. WHAT TYPES OF ENZYME USED IN BANGLADESH?
Acid and neutral Enzymes Acid and neutral Enzymes
34. WRITE DIFFERENT BETWEEN ACID ENZYME & NEUTRAL ENZYME.
Acid enzyme
1) Acid enzyme colour is
slightly brown.
2) ph =( 4.5 to 5.5)
3) Temperature: (40-55)0 C
4) Time: 25-50 min
5) More staining
Neutral enzyme
1) Neutral enzyme is slightly white
powder form.
2) ph= ( 6 to 7)
3) Temperature: (40-60)0C
4) Time: 40-70 min
5) Less staining.
35. HOW CAN CONTROL THE PH VALUE IN GARMENTS?
If garments in alkali media then we apply acid to control ph.
if any garments in acetic media then we apply alkali to control ph.
By using Buffer solution.
36. WHAT TYPES OF ENZYME SUITABLE FOR DARK SHADE ENZYME WASH OF DENIM LONG
PANT & WHY?
Neutral enzyme is used for Dark shade enzyme wash because it comes
fading effect slowly.
37. WHAT TYPE OF ENZYME SUITABLE FOR MEDIUM/LIGHT SHADE ENZYME WASH OF DENIM
SKIRT?
Acid enzyme is used for medium /light shade Enzyme wash of denim skirt
because it comes enzyme effect quickly than neutral enzyme.
38. WRITE DESIZING PROCESS OF TWILL LONG PANT FOR ENZYME WASH.
Lot weight (80 pieces) ............ 60 kg denim long pant.
Add water at L : R = 1 : 9
Machine Running.
Add Desizing agent at 0.6 gm / litre
Add Detergent at 0.8 gm / litre
600C & (15-20) min then drop the liquor.
39. WRITE ENZYME BATH PROCESS OF TWILL LONG PANT ENZYME WASH.
Add water at L : R = 1 : 8 .............. 450 Litre
Temperature.......................... 45°c.
Add Acetic Acid at 0.6 gm / litre ................... 270 gm.
Add Anti back staining at 0.6 gm / litre........ 270 gm.
Add Acid Enzyme at 2.00 gm / litre ................ 900 gm.
Time.............. (Depend upon the shade)...40--60 mts.
Increase temperature to 90°c and run 1 minute (enzyme killing).
Drain the bath.
Rinse Twice, each 3 minutes.
40. WRITE DIFFERENT TYPES OF WASHING FAULTS.
Color shade variation.
Crease Marks.
After wash hole.
Very dark & very light.
Bleach Spot.
Bottom hem & course edge destroy.
Running shading.
Over blasting / low Blasting.
Over grinding / low grinding.
Bad smell due to poor neutralization.
Poor hand feel.
To high hairiness.
Poor brightness.
High or low affect / abrasion on garments.
Spot on garments.
Out of range / level of ph value of garments.
41. WHAT IS THE PERFECT TEMPERATURE FOR ACID ENZYME AND NEUTRAL ENZYME?
(40-60) 0C
42. WRITE MAIN PROCESS OF STONE ENZYME WASH FOR DENIM LONG PANT.
1.DESIZING:
WATER=700 L 8 MARK
ID ECHO=500 g
SODA ASH=1 kg
60CX20 min
2.WASH 2 TIMES WATER 700 L
00CX2 min
3.ENZYME
WATER=700 L 8 MARK
ACETIC ACID= 200g
ID ECHO=500 g
ACID ENZYME=200g
POWDER ENZYME=700 g
STONE=15 kg
45CX35min
4.WASH 1 TIMES
WATER=700 L 8 MARK
00CX2 min
5.ID ECHO
WATER=700 L 8 MARK
ID ECHO =300g
45CX5 min
6.WASH 1 TIME
WATER=700 L 8 MARK
00CX2 min
7. SEND
TO PP
SIGNATURE (CHECK & to PP):
8. PP NEUTRAL
WATER=600 L 9
MARK
DENIM
CALL PACE=1kg
00CX5 min
9.WASH 2 TIMES
WATER=700L , 00CX
min
10.BLEACH
WATER=700
L , K.C.I.=6 kg
50CXCHECK AS
TIME
11.WASH 1 TIME
WATER=700L, 00CX2
min
12.BLEACH
NEUTRAL:
WATER=700L
HYPO=2 kg, 00CX5
min
13.WASH 1 TIME
WATER=700 L, 00CX2
min
14. CAUSTIC
WATER=700 L
ID ECHO=100g
CAUSTIC = 200g
SOF PEC(SILICON)=50
g
WASH 1 TIME
15(last step).ph
CONTROL+SOFTNER
WATER=400L 11
MARK
ACETIC ACID=300 g
NORMAL
SOFTNER=2kg
00CX3 min
SIGNAURE (Check and
Delivery):
43. WRITE THE FUNCTION OF ANTISTAIN, DETERGENT, AND POTASSIUM PER MANGANATE,
MICRO EMULSION SOFTENER, HYDROGEN PEROXIDE, OPTICAL BRIGHTENER, AND DESIZING
AGENT.
ANTISTAIN: To protect the garment from staining , bleeding.
DETERGENT: To remove dust, dirt and other impurities from the garments.
POTASSIUM PER MANGANATE: after desizing it is sprayed in garments
area.
It helps for color out from garment during Enzyme wash.
MICRO EMULSION SOFTENER: To soft the garment and get better hand
feel.
HYDROGEN PEROXIDE: Enhances bleach to produce light shade.
OPTICAL BRIGHTENER: For more whitening grey fabrics.
DESIZING AGENT: Removes the sizing material from the garment
44. DESCRIBE ONLY BLEACHING PROCESS OF BLEACH WASH OF DENIM LONG PANT.
Add water @ L: R = 1: 8.............. 480 litres.
Machine running.
Add bleaching powder (k.c.i) @ 10 gm/litre. 4800 gm.
Add soda ash @ 5 gm/litre ............................... 2400 gm.
Temperature............................................................ 60°c.
Time (Depend upon the shade).................... 12 to 15 mts.
Drop the liquor.
Rinse twice, each 3 minutes.
45. WHAT DO YOU KNOW ABOUT PUMIC STONE?
When the impurities amount will be 10% of a pumic stone its
density increases to 1 gm/cm3. Then the stone will not float.
Alternative of pumic stone: SYNTHETIC STONE
Stone wt. /fabric wt. = 0.5 to 3 /1
Dia.of stone-1-7 cm
Moisture content-less than 5%
Surface properties-less than 5% fines
Apparent Density-0.5-0.75gm/cm3
Abrasion loss-35%
Large, hard stones last longer and may be suited for heavy weight
fabrics only.
Smaller, softer stones would be used for light weight fabrics and more
delicate items.
46. WRITE THE APP. ENZYME & SILICON WASH CHARGE FOR TWILL MEN’S & BOY’S TROUSER
SEPARATELY.
Twill men’s for Enzyme u$ 2.5-3.00 / Doz. For boys trouser
U$ (2.00-2.50)/Doz.
For silicon wash twill men’s u$2.00-2.50/Doz and For boys trouser
U$(1.50-2.00)/Doz.
47. WHY WE RUN THE DRYER WITH GARMENT AFTER DRY 10 TO 15 MTS. IN COLD POSITION?
We run the dryer with garment after dry 15-20 mts to back the garments to
normal temperature
Evaporation of water vapor from inner drum.
48. WHICH DRYER IS SUITABLE TO DRY WHITE READYMADE GARMENTS AND WHY?
STEAM DRYER.
because there is no possibility to occur any stain, yellowish
effect.
49. DESCRIBE THE RISK/PROBLEM OF GAS DRYER.
The temp of gas dryer can be increased suddenly and it also makes flame.
So there have high risk to get damage of garments.
If the temp of gas dryer is higher, then garments will also be destroyed or
loss of strength.
Sometime occurs yellowish effect on fabrics so avoided during white
coloured garments drying
50. DESCRIBE THE FAULT/PROBLEM OF GARMENTS IF EXCESS LOAD IN THE WASHING
MACHINE.
Washing chemicals will not work properly so
desizing/fading/bleaching/softening will not achieve as required level.
51. WHAT ARE THE REASONS OF AFTER WASH HOLE?
For improper application of chemical
Defect of washing machine.
FOR STONE with less L:R amount during washing
52. WHAT IS THE STANDARD R.P.M (INNER DRUM) OF INDUSTRIAL DRYER?
RPM= 24 for any volume of garments
53. IF INNER DRUM R.P.M OF WASHING M/C AND DRYER M/C IS TOO HIGH, WHAT TYPES OF
EFFECT ON GARMENTS?
If inner drum r.p.m of washing machine is high then the garments attached
with inner drum and with one another and their rotation be increase. As
a result the garments become more compact and that’s why the chemical
solution for washing machine and temp for dryer machine cannot work
properly towards
the garments.
54. WHAT ARE THE STD L:R FOR DESIZING, ENZYME BATH, SOFTENER BATH.
L: R for desizing 1:9.
L: R for enzyme bath 1:7.
L: R for softener bath 1:6
55. WRITE THE NAME OF STEPS OF STONE ENZYME WASH PROCESS OF DENIM LONG PANT.
Desizing
Hot wash
Enzyme wash
Bleaching
Neutral wash
Soft wash
Hydro extractor Machine
Drying
Delivery.
56. WRITE THE NAME OF STEPS OF ENZYME WASH PROCESS OF DENIM (DARK) ENZYME
WASH PROCESS.
Desizing
Enzyme
Softening
Hydro extractor Machine
Drying
Delivery.
57. WRITE THE FLOW CHART OF (MEDIUM) ENZYME WASH OF DENIM READYMADE GARMENTS.
•DESIZING
2
•ENZYME
3
•BLEACHING
4
•NEUTRALIZING
5
•SOFTENING
6
•HYDRO-EXTRACTOR
7
•GAS DRYER
8
•DELIVERY
58. WRITE THE CHEMICAL NAME OF ACID WASH PROCESS.
Desizing agent
Detergent.
Potassium per manganate.
Phosphoric acid.
Metabisulphite.
Acetic acid.
Softener
59. WHAT IS THE STANDARD STOCK SOLUTION OF P.P. SOLUTION?
Stock solutions for P.P spray is 10gm KMnO4 in 1 litre SOLn + 1%
LUBRICANT
60. HOW DO YOU NEUTRALIZATION OF P.P. TREATMENT GARMENT?
Oxalic acid (COOH-COOH)
61. WRITE THE PRECAUTION OF ACID WASH.
Maintain the stock solution properly constant when comes socking the stone.
No water licks age in to the machine when treated pumic stone & garments
in to the machine.
Not excess load the garments in the Acid wash processing.
Add some new stone after finishing on batch to maintain the volume for 2nd
batch. It is a matter of experience.
62. WHAT TYPE OF DYES USED FOR TINTING OF READY MADE GARMENTS?
Reactive Dye, Direct dye.
63. GENERALLY WHICH COLOR IS USED FOR TINTING?
Orange (bright color), Yellow or Blue. Similar shade given colours.
64. WRITE THE MAIN TINTING PROCESS (DYEING) BY DIRECT DYES.
Step 1: Desizing: Batch size: 60pcs
Water is added
Garments are loaded
Machine started
500 gm Soda ash added
500 gm Caustic soda added
200 gm Bio. D added
Steam temp: 60°C
Process time: 25 minutes
Drop liquor
Step 2: Enzyme wash:
Water added 400 liters
Machine running
200 ml liquid, 400 gm powder type enzyme added
150 ml Acetic acid added
200 gm Anti Back staining agent added
10 kg Pumice stone added
Temp: 50°C
Process time: 60 minutes
Drop liquor
Step 3:Bleaching
Add water at L:R=1:8…..480 litre
Machine running.
Add bleaching powder (k.c.i) at 10 gm/litre.. 4800 Gms.
Add soda ash @ 5 gm/litre ..............2400 gm
50c x15-20 mts
Drop the liquor.
Rinse twice, each 3 minutes.
.
Step 4: Neutral wash
Water is added: 400 liters
Machine running
500 gm Hypo sulphide added
Steam temp: 45°C
Process time: 10 minutes
Drop liquor
Step 5: Tinting
Water is added (400 liters)
Machine running
Add 0.02% Direct Brown GTL and 0.01% Direct Black V-200
4kg salt is added
Steam temp: 70°C
Process time: 20 minutes
Check shade
Drop the liquor
Step 6: Drying
65. WRITE THE MAIN TINTING PROCESS (DYEING) BY REACTIVE DYES.
Step 1: Desizing: Batch size: 60pcs
Water is added
Garments are loaded
Machine started
- Xem thêm -