| 摘要 |
A packaging structure of planographic printing plates and an internal packaging material for the plates, which reliably protect the planographic printing plates from an external force, and which block the plates from light and keep the plates free from moisture; wherein the internal packaging material and an external packaging material are easily recycled. A stack of the planographic printing plates is internally packaged in the internal packaging material, whose light transmittance is a predetermined value or lower, and the stack is further packaged in the external packaging material. Light coming from the exterior of the closed external packaging material to the interior thereof becomes faint, and moreover, the planographic printing plates are prevented from accidental exposure due to a light-blocking property of the internal packaging material. In order to more reliably protect the planographic printing plates, the external packaging material has a predetermined strength, and further has a buffering property against changes in temperature and humidity.
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