Moisture Regain & Moisture Content by using rapid dryer

In this experiment we will measure Moisture Regain & Moisture Content of a material by using rapid dryer. It is very important to know about the MR & MC of a material because it directly affect the end product characteristics.
  
Moisture Regain: Moisture regain is defined as the weight of water
in a material expressed as a percentage to oven dry weight.

Let, oven dry weight of the material, D
Weight of water in the material, W
Moisture regain, R = W/DX 100%
  
Moisture Content: Moisture content is the weight of water in a material
expressed as a percentage to the total weight.

Moisture content, M = = W/(D+W)X 100%
  
Rapid Dryer: It is a electrical device with motor , thermometer & container  to pass hot air & measure the temperature of the textile material in the container.
  
Objectives:

    To determine the Moisture Regain ability of a textile material.
    To know the Moisture Content ability of a textile material.
    To get a perfect testing result.

Instruments:

    Rapid dryer.
    Sample.
    Electric balance.

Rapid dryer

Working Procedure:

At first 5gm cotton fiber is taken with the help of electric balance.
Now taking the sample in the container, weight is again measured.
Placing it in the oven dryer and heated for 1 min to dy off the moisture.
Weight is again taken.
3 & 4 repeated until the last two weights are same.

Data measurement table:

Sample wt. (gm)	Sample container wt. W1 (gm)	Sample container wt. after drying W2 (gm)	Average wt. W2 (gm)	Weight of water (gm) W=W1-W2	Oven dry wt. D= 5-W (gm)
5	63.07+5 = 68.07	67.70	67.68	0.455	4.545
		67.65

Result:

Moisture Regain R = 0.455/4.545X 100%
               = 10%

Moisture Content M  = 0.455/(4.545+0.455)X 100%
                    = 9.1%


After this experiment we have a clear idea about how to measureMoisture regain & moisture content. It will help us in future.