Eco viscose spandex pointy de roma

 Eco viscose spandex pointy de Roma 

Today in this blog,  I am going to discuss Liva eco viscose spandex pointy de Roma fabric. 

First of all, we need to know how to calculate yarn feeding%.  

Suppose that,  we will make a Spandex pointy de Roma fabric of 290 gsm.  

Here,  

Required yarn count: 34/1 live eco viscose 100%+75 D polyester + 30D spandex 

Required gsm:290

Required stitch length: 2.75 + 2.45 + 1.18

Here we checked the stitch length of the fabric by calculating 100 needles on one side of the fabric and got above the stitch length.

34/1 live eco viscose will be used in the interlock and 75d polyester +30d spandex will be used in only the dial and only the cylinder part. 

To make sure the yarn Feeding percentage we need to check practically. Here I have given the practical data that will help. 

Yarn feeding%  calculation :

First, need to calculate the ratio of stitch length and yarn.  

For viscose : (2.75/34)=0.081

For polyester: Need to convert 75D polyester to cotton count =5315÷75=70.87

So ratio for polyester=(2.45÷70.87)= 0.035

For 30D spandex: Need to convert 30D to cotton count.  30D is equivalent to 177.17 cotton count. 

So ratio for spandex =(1.18÷177.17)=0.007

The total ratio is 1.22

Now need to calculate  feeding % and got as below : 

34/1 viscose: (0.081x100)÷1.22=66.24%

75D polyester :(0.035x100)÷1.22=28.31%

30D spandex: (0.007x100)÷1.22=5.45%

Now I am going to discuss the knitting to the finishing process in a sequence.

Before knitting we did a grey fabric wash which result is as below: 

Before wash dia: 64 inch 

Before wash grey gsm: 291 

After washing dry  dia: 45 inch

After wash gsm : 388 

Lengthwise %: -17%

Widthwise %:-8%

After that, we started knitting.  

After that,  we need to heat set the fabric due to the above 5% spandex being used. 

Heat set parameter : 

Speed: 15 meter /minute 

Temperature:200°C 

Overfeed: 55%

Setting dia: 58 inch 

Grey dia: 58 inch 

Grey gsm : 356 

After heat set dia: 60 inch 

After heat set gsm : 275

After that, we need to dye the fabric in double parts.  And then we dry the fabric in a starter machine.  The stenter parameter is as below: 

Speed: 30 meter /minute 

Temperature:150°C 

Overfeed: 40%

Setting dia: 58 inch 

Padder pressure:5/2

After stenter set dia: 57 inch 

After stenter gsm : 282

After that we checked shrinkage and got as below: 

Finish dia: 56 inch 

Finish gsm: 285 

Lengthwise %: + 1% 

Widthwise %: -3.3% 

Spirality: 2.1%