Abstract: A method is provided for improving the uniformity of the surface weight of a mineral wool mat. The mat is produced from a mineral melt which is converted into fibers, these fibers being introduced into a gas-formed stream providing a transport medium for these fibers. The transport medium and the mineral fibers carried thereby are transported to a moveable collector band on one side of which the mineral wool is deposited so as to form the mineral wool mat, the transport medium being caused to pass through the collector band by means of a fan or the like. The method comprises measuring at least one variable which is characteristic of the transport medium and which varies in relationship to the amount of mineral wool deposited.

Abstract: A method for the manufacture of a sheet containing mineral fibers and binder. An aqueous suspension containing fibers and binder is formed into a layer. The layer is de-watered to form a wet sheet. Additional binder is applied evenly to the entire surface of the de-watered sheet. The sheet is then dried. The sheet may be compressed to an extent of 20% during drying.

Abstract: A method for producing shaped bodies of fibrous materials using mineral fibers, cellulosic fibers, and zero fibers. The zero fibers are extremely thin and short cellulosic fibers produced either synthetically or from natural by-products from the cellulose industry. These bodies can be used as substitutes for asbestos fiber products, and display physical properties, such as resistance and rigidity, comparable to the asbestos products. The fibrous materials are produced using an aqueous dispersion of the mineral fibers, cellulose fibers, and zero fibers, whereafter the dispersion is de-watered, shaped and dried.

Abstract: A method of producing alkali-resistant mineral wool. The starting material is melted and formed into fibers and the fibers are cooled and collected. The raw material has the following composition:______________________________________ SiO.sub.2 40-60 wt. % Al.sub.2 O.sub.3 1-15 wt. % CaO 1-6 wt. % MgO 30-45 wt. % Iron oxides 1-8 wt. % Alkali oxides maximum 2 wt. % Other oxides maximum 2 wt. %. ______________________________________The raw material preferably includes olivine.

Abstract: Apparatus for manufacturing mineral fibers from a mineral melt. Two groups of spinner wheels are arranged symmetrically with respect to each other. Each group includes a primary spinner wheel which receives molten mineral and a secondary spinner wheel to which material is transferred from the primary spinner wheel. The wheels in each group are rotated on horizontal axes in opposite directions and the secondary spinner wheels are rotated in a direction such that at the place where they are closest to one another, the peripheral motion of each is upward. An air stream is directed horizontally and generally axially of the spinner wheels such that it sweeps over the peripheral surfaces of the spinner wheels for transferring fibers to a fiber collection surface.