| abstract |
(57) [Summary] [PROBLEMS] To independently maintain the same flexibility, rigidity, light-shielding properties, etc. as paper, and to perform the same performance as those laminated on both sides of paper without laminating other members on both sides. The present invention provides a food packaging material having a core material made of a new material instead of paper, which is lightweight, has no fear of leakage between layers and has no sealing property, and can be easily manufactured. SOLUTION: The porosity is 5 to 50% and the pore size is 0.5 to 50%. The core material is a thermoplastic resin foam sheet having fine independent holes of 100 μm. |