... Acrylic,ps,plastic *make light box ,LED letter vacuum forming machine for acrylic 1.Do not have upper and lower die alignment, ... mold constraints, drawing a small amount of thinning, choose thin plates, material is more economical;D. Die on simple, accurate, and ... high efficiency.6. 2 indivicual heating boxes, single work and double work are available according to different acrylic sheet size.7 ...