**Correct Invoice Weight:**

The weight obtained after adding standard moisture regain of the material with the oven-dry weight is called correct invoice weight or conditioned weight. It is expressed **C.I.W.** In this article, we will know about the calculation of the correct invoice Weight of textile material.

That is,

CIW = Oven dry weight + Standard moisture regain

Let,

C = The oven dry weight of the consignment

S = The Original weight of the sample

d = The oven dry weight of the consignment

W = The weight of the consignment at the time of sampling.

Now,

………d

C = …… X W

………S

For samples dried out without cleaning,

………………………………………….100 + R1

Correct Invoice Weight = C [………………..]

………………………………………………100

Where R1 is the official allowance for moisture regain.

For samples dried out after cleaning,

………………………………………..100 + R + A + B

Correct Invoice Weight = C [………………….……]

………………………………………………….100

Where, (R + A + B) is the total allowance for M.R

……………………………………………100 + X

CIW for blended material = C[………..….]

……………………………………………….100

**Calculation of Correct Invoice Weight of Textile Material**

**Problem-1:**

Calculate the Moisture Regain and Moisture Content of Cotton / Viscose Blend which is having 60% cotton and 40% Viscose in proportion. (Assume necessary details)

**Answer:**

Assumptions

Moisture Regain for Cotton – 8.5%

Moisture Regain for Viscose – 13%

Moisture regain % of Mixture

= (8.5 * 60 + 13 * 40) / (60 + 40)

= 10.3%

Moisture content % = MR / (1+MR/100)

= 10.3 / (1+0.103)

= 9.34%

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**Problem-2:**

20 tons of 40s Ne 80/20 P/C yarn @ 4% moisture content is shipped. What will be the correct invoice weight? [The official moisture regains of polyester and cotton is 0.4% and 8.5% respectively].

**Answer:**

20,000 Kg = W + D

Rb = 8.2 * 0.2 + 0.4 * 0.8

= 2.02%

Moisture Content = 4 = [W/ (W+D)]*100

4 = [W / 20,000]*100

So, W = 4 * 200 = 800 kg

Dry Mass of Yarn = 20,000 – 800 = 19200 kg

Total water allowed WI ,

2.02 = (WI / 19200) * 100

WI = 387.84

Total Invoice Weight = 19200 + 387.84

= 19587.84 kg

Author of this Article:Mayedul IslamMerchandiser at Fashion Xpress Buying House. Badda, Dhaka, Bangladesh. Email: [email protected]