Display panels made at least partially of stretch fabric are disclosed. The optical mouse also includes circuitry or a processor to detect bar codes and demodulate data encoded therein. The second drum device is arranged between core clamping devices and is structured and arranged to join the carcass tube and the belt package during expansion of the second drum device. The ink from the ink pool chamber flows in a regular manner and no stagnation is generated, and bubbles are smoothly eliminated. Also disclosed is a process for purifying paraxylene in a filtration zone.