TEXTILE - KNITS

General

1. What is the purpose of this site

   To share the know how of the textile

2. how can we see the information

   By becomeing an active member now

3. What is knitting

   Pls check the basic concept of knitting in page " KNITTING"

4. How to calculate wet pickup in Continuous process

   Pls check wet in wet calculation in Home page

5. gots certification

   To get GOTS certificate, if u want to establish sytems in ur organisation, pls contact me at my emailid, [email protected]

6. is it possible to increase the washing fastness property of poly based fabric

   yes, it is possible. Though there are no. of factors which effects the poly fastness

   1- Poly yarn

   2- Fabric structure

   3- Fabric dyeing temperature

   4- Dyes

   5- Drying temperature

   6- Soaping method

   7- Soaping chemical

   I have found that onecompany based in Mumbai, The Assosiates chemicals hav developed a combination of two chemicals, which works up to a limit to improve wash fastness

7. What is the tolerance in blend % in any fabric

   In blen % tolerance is 2% of the blend percentage.

8. If there is formaldehyde content in any fabric , how it can be minimised or reduced up to a acceptable limit

   If formaldehyde contant is present , it may be from the Chemical such as fixer, Resin etc. The best way to remove the free formaldehyde is boil the fabric in presence of acitic acid with soap. The pH should be around 5.0

   If possible pls core neutraliser also .

Technical

1. How to check performance of soap used in reactive dyeing as washing off agents

   Pls check the performance of soap by dyeing 0.5% Turquise shade with and without Soap. Lesser the depth of dyed fabric in presence of soap better the performance of soap

2. Why there is weight loss in lycra fabric more than non lycra fabric

   Weight loss hapenns at two places.

   1- In process

   2- On account of moisture loss

    

      In lycra fabric we loose Moisture more than the cotton fabric, hence weight loss is more

3. I have a white garment with Red patch in that , what to do to avoid color bleeding in washing

   This is very common problem of poor soaping of dyed fabric.

   In this case either we have to treat the white fabric with Thioten As of clarient , Or treat Red or any dyed fabric with a detergant which acts as like NRV valve for the colour. If that also does not work, then do the resin finish to the Red colour fabric.

4. Is it advisable to pour the garment itself in the dyefixer

   If the red colour portion is very less then it may work, But if the dyed fabric portion is large in the garment, in that fixer will help to fix the unfix dyes on white ground also, Which will be looking as tint on white ground,this tint will not go easily. Hence as much possible donot dip the garment in fixer bath.

5. Do we need to do centrifugal hydro to the 100% viscose fabric

   No, It is not required, If we do this, the there will be crease marks in the fabric which can't be removedat any stage later on.

6. How can we manufacture crease free viscose fabric

   To manufacture crease free viscose fabric , it is very tough job. And it is dream of any dyehouse incharge. The secret which i could find out inmy crrier is that we should not give any treatment to viscose at less than 50 deg C temp. in dyeing vessel. 

7. How can we check that fabric haveing elastomeric fibre is properly heat set

   The processed fabric should be cut in square , and keep on table without any pressure or pulling. If fabric remain flat from all side it is properly heatset.

8. I have done heatsetting of elastomeric fibre more than 60 sec, even though there is curling in th fabric. why it is so?

   If it happens , it means the type of elastane is beeing used haveing unevenness. I have faced this problem when i was working in arvind. It is vey typical problem, No one can understand this problem without seeing actual fabric. The solution is to change the lycra type only

9. CAN I CALCULATE THE FABRIC WIDTH FOR THE KNITTED FABRIC

   Yes if the fabric is without tuck, then it is very easy to calculate the finish width of knitted fabric. But if u know the WPI of the finish fabric then it is very easy to calculate the finish width by deviding the no. of needle of knitting machine by the wpi. e.g. 32 is wpi for Ne 20/1 s/j fabric, and if we knit on 30" 20 gg machine , where the needles are 1890 needle, then width will be 1890/32 inch.

10. For lycra fabric can i know the finish parameter from the grey parameters

    Yes we can derive the finish width , If we know the grey gsm, grey width, targeted finish gsm. Then finish width is calculated by the below formula

    =grey gsmxgrey width*1.1*0.9*0.86/finish gsm

     

    
    

11. How can we bleach jute fabric

    The bleaching of jute is a typical process of neutralising first iron contant in jute then bleaching jute.

    Most of the time people try to do this by oxalic acid, Hcl.

    But i tried to do this with H2O2 , i did Cold oxidative bleaching with 80 gpl H2O2, 35 gpl Caustic and 16 gpl Peroxide stablizer. 

    Followed by the steaming in cbr.

12. After finishing all processes, a fabric was tested and found to contain some APEO traces and the level of the APEO content present was not within the acceptable limits. Is there any proven method to remove the APEO content?

    There are two simple treatments one can try.

    1. Do hot soaping using a real APEO free surfactant, followed by 2 hot and cold washes.

    2. Treat at 70°C with Formic acid 2gms/liter for 30 minutes, followed by 2 hot and cold washes.

13. How to calculate the GSM of flat knit collar

    Measure the weight of flat knit collar in Gms.

    Measure the length and width of collar in cms.

    then use the formula

    GSM = Weight in gmsx10000/length of collar /width of collar in cms

14. What is APEO

    –Alkyl phenol ethoxylates is the full form of  (APEOs)

    –APEOs are non-ionic surfactants which find wide use inthe textile industry in detergent or chemical mixtures as surfactants,emulsifiers or dispersants.

    - It is in general two types, NPEO, OPEO
    

15. How can we remove the APEO from Textile

    Any Textile item which has APEO , will release the APEO in the subsequent cold washes, And that is the reason, It is banned chemical in the textile. Because this released APEO will kill the sexual ability of aquarious .

    So if there is limited amount of APEO in any textile item, then with multiple washes with Powerfull sequestring agent it can be reduce.

    If you can wash the textile item in 10- 20% solution of acetone , then it can remove completly the APEO from the textile.