Taking advantage of the Blu-ray disk’s thick substrate structure, Sony and Toppan Printing have developed a “paper” disk that can hold 25 Gbytes of video data. Blu-ray disks have a recording layer just 0.1 mm from the surface. Only the 0.1-mm thick protection layer, or cover layer, must be transparent for a laser beam to reach the recording layer. Researchers at the two companies have been working for the last year on a paper material to support the 1.1-mm substrate. The newly developed material uses paper pulp with plastic soaked into it. Over 51 percent of its weight is a pulp material. Substrate thickness is greater than DVD disks. The thickness and stiffness of newly-developed material yielded a warp-free disk. The two companies suggested the paper disk could also reduce disk costs as well. But the disk technology is still at laboratory stage, and volume production technology has to be developed for practical applications.

Taking advantage of the Blu-ray disk’s thick substrate structure, Sony and Toppan Printing have developed a “paper” disk that can hold 25 Gbytes of video data. Blu-ray disks have a recording layer just 0.1 mm from the surface. Only the 0.1-mm thick protection layer, or cover layer, must be transparent for a laser beam to reach the recording layer. Researchers at the two companies have been working for the last year on a paper material to support the 1.1-mm substrate. The newly developed material uses paper pulp with plastic soaked into it. Over 51 percent of its weight is a pulp material. Substrate thickness is greater than DVD disks. The thickness and stiffness of newly-developed material yielded a warp-free disk. The two companies suggested the paper disk could also reduce disk costs as well. But the disk technology is still at laboratory stage, and volume production technology has to be developed for practical applications.