The present invention realizes both the reduction of thickness of a liquid crystal panel and the acquisition of a sufficient strength of the liquid crystal display panel simultaneously. The liner is pulled through the feeder by a capstan drive having opposed fluted nip rollers driven by a stepper motor. The substrates have a diameter from about 0. The sheet material is folded about a longitudinal fold line to form first and second overlapping fold portions and is introduced under conditions selected to cause the second fold portion to become permanently bonded to resin of the base, while leaving the first fold portion remaining free to be subsequently unfolded from said second fold portion about said fold line.