چکیده:
In this research, an apparatus was designed and constructed in order to simulate
the storage behavior of hand-woven carpet under different environmental conditions.
Silk hand-woven carpet (“Gom”) with 115×75 cm dimensions and 102×97
knot per 10 cm was selected and then inserted into the packing simulator with
two different laying configurations including flat and folded. The environmental
conditions was adjusted at 3 different conditions including 25 ± 5% r.h and 30 ±
2°c (July-Tehran-Dry), 65 ± 5% r.h and 6 ± 2°c (February-Tehran-humid), 40 ±
5% r.h and 19 ± 2°c (October -Tehran-mild). The carpet sample was compressed
under constant loads of 135 and 150 kg. The variation of carpet thickness with
time in different parts of carpet was continuously measured using data acquisition
system. The result of experiment shows that the carpet thickness is suddenly
decreased at a short period of time and then reached to a stable condition. The
variation trend of carpet thickness with time is accordance with a logarithm
equation(y=a×Ln(t)-b) which is highly in agreement with Eyring model proposed
in creep theory . But at the dry conditions, the variation of carpet thickness at the
folded point follow a non-linear power equation (y=a×(t)^b) with a low correlation
coefficient. However, the variation of carpet thickness at the non-folded
point and flat configuration is very low.
Generally, at the humidity condition, maximum carpet thickness variation
occurred at folded point with folded configuration. On the other hand, carpet
thickness variations at dry condition are less those of at humidity and mild conditions.
In addition, carpet thickness at dry condition more quickly reached to stable
condition than those of at humidity and mild conditions.