| 摘要 |
FIELD: utilization and manufacture of building materials. SUBSTANCE: membrane roofing is cut into equal in area sheets. The sheets are combined into packet and the latter is introduced into vessel with grating bottom, the sheets being arranged and fixed in vertical position. Packet is exposed to hot air, high-frequency currents or infra-red irradiation until bitumen has flown down from the sheets. Bitumen-free backing is then removed and passed through rolls. EFFECT: reduced cost and amount of hazardous outbursts into atmosphere. |
