Wrinkle or Cotton Fabric Crease Resistance and Recovery Tester Testing [বাংলায়]

Contents of This Video Tutorial: What is Crease, Wrinkle, Crease Recovery, Crease Resistance, Crease mark. Causes of Fabric Crease Crease Recovery Test of Fabric Factors that affecting crease recovery and Fabric Crease Crease Properties of some common fibres like cotton, jute, wool, silk, nylon, flax, rayon, polyester, acrylic, acetate, viscose rayon etc. How can we reduce or minimize crease. #Creases: Creases are a fold in a fabric introduced unintentionally. #Wrinkle: Short and Irregular creases Three Dimensional creases They form when fabric undergo double curvature. Somebody says, same as crease. #Crease_mark: Crease mark are marks left in a fabric once caused by mechanical damage. #Crease_Resistance: It is the ability of a material to resist, or recover from creasing. #Crease_recovery: It is a fabric property which indicates the ability of fabric to go back to its original position after creasing. Causes of Crease: Applied Pressure Temperature Change Relative Humidity Change Poor Construction Poor Fitting garments Testing of Crease Recovery of Fabric: Sampling: Sampling can be done by not choosing same warp and weft from specific sample. Avoiding creased, bend or deformed section of fabrics. Selecting 2" inside the selvage. Ten sample has to be selected. Specimen size is 2" by 1". Since the moisture present in the fabric influences the results the tests are carried out after conditioning in the standard atmosphere. Objective: To measure the crease recovery of the given fabric. Main Parts are: Circular Dial(Graduated in degrees along its periphery with an accuracy of 0.5 degree), Knife Edge (A knife edge and an index line for measuring the recovery angle. directly under the centre of the dial. Clamp (Specimen clamp to hold one limb of the specimen in such a way that the fold lies in a horizontal line on the axis of the circular scale. and Leveling Screw (Means for level-ling the apparatus. Procedure: The instrument is levelled with the help of the levelling screws and spirit level. The specimen is folded gently end to end with its edges in one line, with the help of the tweezers. The edges should not be gripped more than 5 mm in the tweezers. The folded specimen is placed on the lower plate of the loading device and the load is applied gently, The load is then removed after 5 minutes. Crease recovery angle is tested. Elastic modulus and bending modulus is important here. Hydrogen Bond and Tg and Relative Humidity is important. Factors affecting: Fibre property Coefficient of Frinction Bending Modulus Bending Recovery Fabric Construction Yarn construction Types of weave/knit Ways to minimize or Reduce Crease: By Using Thick fibre Minimizing Rapid Changes in temperature and Relative Humidity Using Flat seam during stitching Treated Chemically during finishing.