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.
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.
8.
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.
11.
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.
14.
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.
16.
17.
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.
19.
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.