| 摘要 |
Rolls of permanently elastic plastic material impregnated with granulated insulation such as Styropor or similar plastic foam balls. The plastic roll is free of solvent, cold reaction, is damp-proof, proof against high temperatures and cold weather and possesses a high diffusion-resistance factor. The side edges of the roll is folded with a water check, and one face of the material is rippled so that the consequent voids serve as vent channels. |
