The hardening time for Up is at least 3 hours at room temperature to ensure that hardening process is complete, to decrease the shrinkage ratio
and to increase the cross linking among the molecules of the substance.
Rehydration ratio, shrinkage ratio and total colour change were determined in these differently dried samples.
The shrinkage ratio of the dried tomato was evaluated by a volumetric displacement method using n-heptane as the working liquid .
The shrinkage ratio was then calculated by the ratio of the initial length divided by the shrunk length.
3, the convention-extruded PPR pipes exhibit high shrinkage ratio along the axial direction, which is an obvious evidence for axial molecular orientation.
The shrinkage ratio is the ratio of the volume of dry membrane to that of wet membrane.
The shrinkage ratio plays a vital role in the porosity of the membrane.
The wet shrinkage ratio
increased with an increase in the PEG content.
However, during the research on CM foams, it was found that the foaming sample presented some problems such as low hardness, high shrinkage ratio
, and bad compression resistance.
Figure 2 shows the dependence of the shrinkage ratio
of the membranes treated for 2 min at various temperatures.
These include high stiffness, heat resistance, low moulding shrinkage ratios
, low emissions and weight reduction when compared to glass fibre reinforced ABS.
Equation 1 reveals that the self-crimp is caused by the difference in shrinkage ratios
between the two sides of the fiber.