FIELD: production of mineral wool webs.
SUBSTANCE: apparatus has vertical shaft, grinding device, device for transportation of mineral wool web, device for dividing of material web in longitudinal direction into first and second web cuts, and device for directing first web cut so that it overlaps second web cut for producing of secondary cloth. First cut transportation path is not equal to second cut transportation path. Vertical shaft has double width. Apparatus is further equipped with device for longitudinal dividing of mineral wool web into first and second web cuts. Transportation device for overturning of first web cut has rotary roller mounted for directing of first web cut around it. First web cut is overturned so that its lower side is facing upward. Each of grinding devices creates mineral wool web forming two layers in secondary web. Methods for manufacture of web and panel involve grinding raw material in at least one grinding device; laying fiber onto sectional belt conveyor of vertical shaft for producing of secondary web; dividing primary web in longitudinal direction so as to produce first web cut or panel and second web cut or panel; transporting first web cut or panel and second web cut or panel so as to provide difference in length of first and second transportation paths in zone between vertical shaft and thermal hardening cabinet; overturning first web cut or panel so that lower side of said web cut or panel is facing upward; placing first web cut or panel onto second web cut or panel for producing of secondary web. Web or panel from stitched mineral wool fiber has non-uniform thickness density, wherein upper zone and lower zone of web or panel have higher density than intermediate zone lying between upper and lower zones. Both layers have identical properties as to fiber quality and/or binder content, and said layers have identical density gradients. According to other version, web or panel is manufactured by same method and differs only in average density, which is 4-11 kg/m3, preferably 4-9 kg/m3, in most preferable version 4-6 kg/m3.
EFFECT: reduced power consumption and improved quality of mineral wool.
24 cl, 7 dwg
