NAME DANISH KHAN KAIM KHANISTUDENT I.D 1415-2013BATCH BS (TEXTILE)DATE 03-11-2015SCORE

TO DETERMINE STARCH CONTENTS IN THE GREIGH FABRIC

PERFORMANCE ABJECTIVEUpon the successful completion of this experiment student will be able to

(i) Understand porpose of different sizes applied on yarns (ii) Understand the way to evaluate size contents in the fabric(iii) Understand the calculating size content

MACHINES/MATERIAL REQUIREDGreigh fabrics Iodine /tagwa solution Violet scale

CHEMICAL REQUIRED Pottasium iodide(100%)EthanolWater

DISCUSSION Sizes are chemicals applied on the warp yarns prior to weaving so that the yarn can with stand wear annnd tear ans different tensions during weaving process .There are there types of sizes that are conventionally applied on the warp yarns Natural Sizes (eg. Starch)Santhitic sizes (eg.PVC)Natural polymer based sizes (eg.CMC)

The amount of size used is mentioned by the greigh department so as to decide the extent of desizing to be carried out

PROCEDUREPrepration of KI solution

Dissolve 10 grams of KI ( potassium iodide ) in 100 ml demineralized water Sir until it is completely dissolve Make the volume up to 800 ml with water Finally add ethanol to make the volume up to 1000 ml

Precautions for Ki Solution Don’t exposs the sun light Store in the brown bottle and used with in 3 months

ASSSESMENT OF SIZE CONTENTS Pour few drops the Ki solution of the fabric to be tasted Rub the cloth gently Compare colour change with violet scale and no rating

NOTE:1. Fabric must be brought to room temperature before conducting the test 2. Before conduction of test the fabric PH should be netrallized

Evaluation

Coloyur change Quantity of starch No change No of starch is presentPale blue Trace of starchBluish brown Appreciable amount of atrachBrown Modified starch PVA

RESULTVoilet Scale rating _____________________________%age of size content in the fabric _________________