Calculation of Chemicals for Padding

by Engr. Kh. Mashiur Rahman | Aug 14, 2016 | Washing

Wet on dry application

For stenter padder tray, it needs minimum 80 liter liquor to dipping the fabric. For wet on dry application consider 90% pick up. So total liquor will be, 90% of fabric weight plus minimum padder tray liquor. Then calculate dosing of chemical.

For example

100 kg fabric needs 90 LTR liquor plus minimum padder tray liquor= 80 LTR,

So total liquor required= (90+80) LTR= 170 LTR

If the chemical dosage is 25 g/l, then total chemical will be 170*25/1000= 4.25 kg.

CHEMICAL EQUATION OF CONFIDENT
ELECTRO-COAGULATION WASTE WATER TREATMENT SYSTEM

By inducing DC pulses in the Electrodes, the following reactions happen in the Electro-Coagulation system.
There is no addition of any chemicals for the Coagulation.

AT ANODE

Fe Fe 2+ + 2e-
(IRON) (FERROUS) + 2ELECTRONS

AT CATHODE

2H2O + 2e- H2 + 2OH-
(WATER) + 2 ELECTRON (HYDROGEN) + 2 (HYDROXIDE)
Fe2+ + 2OH- Fe(OH)2
FERROUS + 2 HYDROXIDE FERROUS HYDROXIDE

Fe(OH)2 acts as the Coagulant and separate the dyestuff and other contaminants.

DYESTUFFS IN THE WASTE WATER CHEMICAL FORMULA IS 2R-SO3-Na

R—SO3—Na
2R-SO3-Na + Fe(OH)2 = Fe + 2NaOH
R—SO3—Na (Dissolved in water)
DYESTUFF + FERROUS HYDROXIDE = SLUDGE + 2 SODIUM HYDROXIDE.

THE ADVANTAGES OF THIS SYSTEM ARE AS FOLLOWS.
1. NO CHEMICAL COAGULANTS USED.
2. OPERATING COST IS VERY LESS.
3. EASY TO OPERATE AND MAINTAIN.
4. BOD AND COD REDUCED BY 60 – 70%
5. TDS AND HARDNESS NOT INCREASED.
6. COMBINED WITH PARTIAL BIOLOGICAL SYSTEM, COMPLIANCE OF ALL THE POLLUTION CONTROL NORMS ARE ACHIEVED.

Standard Chemical Name

Necessary standard requirement of dyes chemical for buyer garment Dye and wash orders. 

Dear Sir’s,

 Hope you are aware of that your company is supplying different laundry chemicals to us for quite sometime.

 And now it is for your kind information that one of our most important buyer Has got some chemical restrictions which are not at all allowed and untolerable at any time In their washing purpose.

 So, if any of your supplied chemical may identified as restricted for use by chemical Analysis department, then buer will charge a huge claim on both of us and they will Cancel our job nomination. Which will be subject of very big business loss for both us. And now sorry to say that we will definitely claim such loss on you by the court of law.

 So, please take all necessary action required to avoid and to prevent such situation.

 Best regards,

Mr. Rahaman

Managing Director

China Textile Ltd.

Acceptance Letter

To,

Oviesse Spa

Via Terraglio, 16

30174 blure, Venezia

Italy

STATEMENT OF ACCEPTANCE OF RESTRICTIONS

ON THE USE OF CHEMICALS

For textile, plastic, leather and metal products.

We would like to hereby confirm that our products named as L/C NUMBER 090FDFD4474C0 Invoice No. EFDDFERR68/11, in all their elements have been produced in compliance with the restrictions of our “ECO REQUIREMENTS”.

We also confirm that you will be entitled to check our products, by any method, at every stage of the production cycle.

You will be entitled to cancel your order or to send back the already delivered goods in case there was some evidence that the goods contain the chemical substances over the allowed limit foreseen by our “ECO REQUIREMENTS”.

You will be entitled to obtain from us Test Reports issued by the official appointed Institutes.

We will be responsible for any problem caused by the use of products in case they contain dangerous substances over the defined limits.

10/05/2011

_________________

DATE

____________________                                ___________________________

SIGNATURE                                                              COMPANY STAMP