Apparatus for the production of mineral fibres from siliceous raw materials such as basalt, especially by the fibre-blowing process

摘要

In the production of bonded mineral fibre wool, binder is injected in the chute (16) onto the fibres, as a result of which there is a tendency for the fibres to adhere to the walls of the chute (16) and to form encrustations due to binder becoming cured in the course of time. To avoid such encrustations, which can cause production shortfalls, the circumferential walls (18, 20) of the chute are constructed as jacketed walls and are cooled by passing cooling liquid in the hollow space (30) between the inner and outer surface portions (28, 29). It has been found, surprisingly, that as a result no solid encrustations can form even over prolonged periods, since temporarily adhering fibres cannot in fact become adhesively bonded due to insufficient curing of the binder at the low temperatures, but are continuously removed from the wall again. In contrast to the permanent cleaning of the chute walls, for example in the form of rotary walls, not only is the considerable expenditure in terms of investment and maintenance and/or unforeseeable plant shutdowns avoided, but also there is obtained dimensionally accurate sealing of the circumferential walls (18, 20) of the chute (16), so that there is no occurrence of fibre losses or attraction of unwanted air.