| 摘要 |
[PROBLEMS] To provide a breathable buffer sheet that not only attains improvement with respect to film/nonwoven fabric delamination and wrinkling at working but also even in wetting due to rainfall, etc., allows resumption of working only by wiping the surface thereof. [MEANS FOR SOLVING PROBLEMS] The breathable buffer sheet for film waterproofing is characterized in that it is a laminate of at least three layers structure including, unified together, a 12 to 80 µm thick film layer (A) of polyester resin, polyamide resin, copolymer of these, ethylene vinyl alcohol resin, vinyl acetate polymer, polyvinyl alcohol resin, vinyl chloride resin or a mixture thereof, a 30 to 100 µm thick film layer (B) of synthetic resin and a layer (C) of nonwoven fabric of 150 to 400 g/m2 basis weight interlaced by needle punching or a fluid entanglement technique, and that the sheet satisfies the formula: 0.5<[B]/[A]=3 (1) wherein [A] is the thickness of the film layer (A) (unit: µm) and [B] the thickness of the film layer (B) (unit: µm). |
