• Share
  • Email
  • Embed
  • Like
  • Save
  • Private Content
Pre treatment test
 

Pre treatment test

on

  • 1,410 views

 

Statistics

Views

Total Views
1,410
Views on SlideShare
1,399
Embed Views
11

Actions

Likes
3
Downloads
137
Comments
1

2 Embeds 11

http://responsiblesourcing.wikispaces.com 10
http://www.linkedin.com 1

Accessibility

Categories

Upload Details

Uploaded via as Adobe PDF

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel

11 of 1 previous next

  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment

    Pre treatment test Pre treatment test Presentation Transcript

    • PRE-TREATMENTIN THE DYEING AND FINISHING PROCESS Responsible Sourcing Initiative Natural Resources Defense Council
    • 2. THE DYEING AND FINISHING PROCESSA. PRE-TREATMENTFirst, we will go through: Woven Fabric Fiber Yarn Knitted Fabric Pre-treatment Dyeing Bleaching Printing Finishing
    • 2. THE DYEING AND FINISHING PROCESSA. PRE-TREATMENTWHAT IS PRE-TREATMENT?• by damaging the fabric as little as possible, removeall the impurities from the fabric• make a semi-finished product that is clean, smooth,soft, and water absorbent (hydrophilic)• the preparation work in a dyeing and finishingfactory work, it can also be known as bleaching andscouring
    • 2. THE DYEING AND FINISHING PROCESSA. PRE-TREATMENTTHE BASIC COMPONENTS OF PRE-TREATMENT:SINGEING DE-SIZING SCOURING BLEACHING MERCERIZING PRE-TREATMENT NOTE: THIS IS JUST AN EXAMPLE OF THE PRE- TREATMENT PROCESS FOR COTTON. PRE-TREATMENT PROCESSES CAN VARY FOR EACH TYPE OF SUBSTRATE.
    • 2. THE DYEING AND FINISHING PROCESSA. PRE-TREATMENT Let’s talk about singeing…SINGEING DE-SIZING SCOURING BLEACHING MERCERIZING PRE-TREATMENT
    • 2. THE DYEING AND FINISHING PROCESSA. PRE-TREATMENTSINGEING REFERS TO THE BURNING OFF OF:- LOOSE FIBERS NOT FIRMLY BOUND INTO THE YARN OR FABRIC- LOOSE YARNS NOT BOUND INTO FABRIC- PROTRUDING FIBER ENDS STICKING OUT OF THE YARN OR FABRIC Information: http://ara-texworld.com
    • 2. THE DYEING AND FINISHING PROCESSA. PRE-TREATMENT BEFORE AFTER SINGEING SINGEING Photo: Osthoff Senge from http://ara-texworld.com/
    • 2. THE DYEING AND FINISHING PROCESSA. PRE-TREATMENT This is fabric going through a singeing machine
    • 2. THE DYEING AND FINISHING PROCESSA. PRE-TREATMENT Onto de-sizing…SINGEING DE-SIZING SCOURING BLEACHING MERCERIZING PRE-TREATMENT
    • 2. THE DYEING AND FINISHING PROCESSA. PRE-TREATMENTThe reason for de-sizing because during the spinningand weaving process, the fabric goes through sizing.SIZING is whenSIZE is applied tothe fabric to protectit from the abrasiveaction of the loom.
    • 2. THE DYEING AND FINISHING PROCESSA. PRE-TREATMENTWHAT IS SIZE?Natural sizing agentsare mostly based onstarch and starch-derivatives. Thereare also syntheticsizing agents such asmodified polyesters. close-up of starch under electron microscope
    • 2. THE DYEING AND FINISHING PROCESSA. PRE-TREATMENTDe-sizing is the removal of sizingagents from the fabric usingenzymes, acid, oxidative agents,etc. Enzymatic de-sizing is themost common.
    • 2. THE DYEING AND FINISHING PROCESSA. PRE-TREATMENTIrrespective of what kind of de-sizing, theprocess includes: Impregnation of fabric with 1 de-sizing agent Allowing the de-sizing agent to 2 solubilize or degrade the size Washing out the degradation 3 products
    • 2. THE DYEING AND FINISHING PROCESSA. PRE-TREATMENT WASH OUTEXAMPLE OF A DE-SIZING PROCESS: ENZYMESF AB RIC + ENZYMES FOR EXAMPLE, CELLULASE, AN ENZYME, BREAKS DOWN STARCH Thanks to Prof. Michal Vik for all the information on de-sizing (from: http://www.ft.tul.cz/depart/ktc/dokumenty/pte/2PTE%20Desizing.pdf)
    • 2. THE DYEING AND FINISHING PROCESSA. PRE-TREATMENT Now we will talk about scouring…SINGEING DE-SIZING SCOURING BLEACHING MERCERIZING PRE-TREATMENT
    • 2. THE DYEING AND FINISHING PROCESSA. PRE-TREATMENTSCOURING is the treatment of textile materials inaqueous or other solutions in order to remove: SIZING INORGANIC DEGRADATION PECTINS SUBSTNACES PRODUCTS ALUMINIUM FATS SIZES AND IRON OXIDES AND WAXES
    • 2. THE DYEING AND FINISHING PROCESSA. PRE-TREATMENTSCOURING can be carried out as a separatestep of the process OR in combination withother treatments (usually bleaching or desizing)on all kind of substrates (fiber, woven fibers,knitted fibers). Thanks to Dr. Schönberger and Dr. Schäfer from Best Available Techniques in Textile Industry for information on scouring
    • 2. THE DYEING AND FINISHING PROCESSA. PRE-TREATMENTEXAMPLE OF SCOURING PROCESS: ALKALI, AB RIC + WETTING AGENTS, ETC.F Thanks to Dr. Schönberger and Dr. Schäfer from Best Available Techniques in Textile Industry for information on scouring
    • 2. THE DYEING AND FINISHING PROCESSA. PRE-TREATMENTSINGEING DE-SIZING SCOURING BLEACHING MERCERIZING PRE-TREATMENT
    • 2. THE DYEING AND FINISHING PROCESSA. PRE-TREATMENTBleaching increasing the whiteness of thesubstrates, this is important for un-dyed fabricsas well for fabrics dyed in light shades or witha high brilliance.Bleached products are usually treated withhypochlorite or peroxide. Peroxide is morecommonly used for cotton whereashypochlorite is used for linen.
    • 2. THE DYEING AND FINISHING PROCESSA. PRE-TREATMENTThis is fabriccoming out ofa scouringand bleachingmachine
    • 2. THE DYEING AND FINISHING PROCESSA. PRE-TREATMENTSINGEING DE-SIZING SCOURING BLEACHING MERCERIZING PRE-TREATMENT
    • 2. THE DYEING AND FINISHING PROCESSA. PRE-TREATMENTMercerizing is the treatment of cotton andcotton blends with strong alkali undertension.Let’s see what it looks like…
    • 2. THE DYEING AND FINISHING PROCESSA. PRE-TREATMENT ALKALI TREATING THE FABRIC N T ENSIO NDER FA BRIC U
    • 2. THE DYEING AND FINISHING PROCESSA. PRE-TREATMENTMercerizing is possible before and after a lot of stepsin the dyeing and finishing process.For example:• on greige goods• after desizing• after de-sizing and scouring• after bleaching• after dyeing
    • 2. THE DYEING AND FINISHING PROCESSA. PRE-TREATMENTMERCERIZING CAN: IMPROVE DYESTUFF ABSORPTION INCREASE TENSILE STRENGTH MAKE A RESISTANT LUSTER IMPROVE DIMENSIONAL STABILITY
    • 2. THE DYEING AND FINISHING PROCESSA. PRE-TREATMENTAll the steps of the pre-treatment process cantake place in something like this:This is a continuous dyeing machine. Graphic from: http://www.ineris.fr/ippc/sites/default/interactive/bref_text/breftext/a nglais/bref/BREF_tex_gb55.html
    • 2. THE DYEING AND FINISHING PROCESSA. PRE-TREATMENTNow that we have looked at all the basiccomponents of the pre-treatment process, let’ssee what a pre-treatment process might looklike for various substrates.
    • 2. THE DYEING AND FINISHING PROCESSA. PRE-TREATMENT GREIGE PREPARATION SINGEINGFor cotton and CAN BEcotton-based fabrics, COMPLETEDthe pre-treatment DE-SIZING IN ONE-BATH DYEINGprocess might looklike this… MERCERIZING SCOURING
    • 2. THE DYEING AND FINISHING PROCESSA. PRE-TREATMENT GREIGE PREPARATION CIRCULAR SINGEINGFor knitted cottonfabrics, the pre-treatment process SCOURING CAN BEmight look like COMPLETED IN ONE-BATHthis… BLEACHING DYEING ALKALI MILLING AND MERCERIZING
    • 2. THE DYEING AND FINISHING PROCESSA. PRE-TREATMENT QUALITIES: RELATIVELY CLEAN SYNTHETIC FIBERS FEW IMPURITIES IN PRE-TREATMENT: GENERALLY DO NOT BLEACH WARM TEMPERATURE FOR PRE-TREATMENT (except for very white or bright colored fibers)