Crease
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The document describes a Crease Recovery Tester, which is used to measure the ability of fabrics to recover from creasing. It consists of a circular dial, clamp, and scale to measure the recovery angle. The test procedure involves cutting specimens, applying a creasing load for 5 minutes, then clamping the specimen and measuring the recovery angle 5 minutes later. This is repeated for warp and weft specimens, and the average recovery angle is calculated. The recovery angle indicates the fabric's ability to return to its original shape after creasing.
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Crease
- 1. Department Of Textile Engineering
- 2. Name Id Md Rasheduzzaman 13141107036 Md Zahid Hasan 13141107042 Md Masum Billah 13141107044 Farzana Akter Mitu 12132107014(8th intake) Nowsher Ahmed 12132107019(8th intake) Md Moinul Hoque 12132107038(8th intake)
- 5. Crease is a fold in fabric introduced unintentionally at some stages of processing. Crease of textile material is a complex effect involving tensile, compressive, flexing and torsional stresses
- 6. Crease recovery is a fabric property which indicates the ability of fabric to go back to its original position after creasing.
- 7. Crease Recovery Tester determines the property of textiles to recover from creases by measurement of the recovery angle.
- 9. Made of heavy caste base with all parts of stainless steel Imported Acrylic Sheet used for making the Rotating Dial. To make the movement smooth the Dial moves in a Brass bush. The same base has both the Steel Creasing Load and two Round Steel Plates for pressing the specimen.
- 10. A circular dial, having a circular scale A knife edge and an index line for measuring the recovery angle, directly under the centre of the dial. Specimen clamp is 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. A mechanism for applying crease on fabric.
- 12. Size of the Test Specimen: 40mm x 15mm. Creasing Load: 10N (Stainless Steel) Angle Measurement: On an Engraved Circular Scale. Scale Measurement: 0-180 Degrees
- 13. The instrument consists of a circular dial which carries the clamp for holding the specimen. Directly under the centre of the dial there is a knife edge and an index line for measuring the recovery angle. Crease recovery is determined depending upon this recovery angle. If the angle is 0o then recovery is zero and if the angle is 180o then recovery is full. Crease recovery depends on the construction, twist of yarn, pressure, time etc. Usually crease recovery is more in warp way than in weft way.
- 15. Ten test specimens are cut from the fabric with a template. Using a pair of scissors or blade with their longer side parallel to warp and weft threads respectively the specimens cut in such a way that no two warp way specimens contain the same set of warp yarns and no two weft way specimens contain the same set of weft yarns. The specimens should not be cut from creased, bent or other deformed parts of the sample and also not from within 2 inches from the selvedges.
- 18. Fold the specimen and if the surfaces of the specimen have a tendency to stick together, place a piece of paper or aluminium foil, between the ends of specimen. Place the folded specimen between the two leaves of the loading device and immediately apply the weight. Start timing device, and after 5mins quickly but smoothly remove the weight from the first specimen. Using tweezers transfer the folded specimen to the instrument’s circular specimen holder. Insert one end of the specimen between the clamps on the specimen holder, leaving the other end to hang freely. While the specimen is in the holder, adjust the instrument to keep the free hanging end of the alignment with the vertical mark. Finally, read and record the recovery angle from the circular scale 5 minutes after inserting the specimen into the clamp.
- 20. The above procedure is repeated for all the warp way and weft way specimens and the average recovery angle is calculated. The load, time of creasing and recovery time may be altered to suit different fabrics. The test should be include the following – Load applied. Time of creasing. Time of recovery. Mean crease recovery angle. Warp way specimens. Weft way specimens.