How do we make stone wool?

Stone wool, also referred to as rock wool, is created by spinning molten rock and minerals with steel slag to create a cotton-candy-like wool product. 

Composition: The basalt, slag and briquette (recycled stone wool) are stored in silos. These raw materials are then automatically weighed and mixed with coke.
 
2. Fusion: This mixture is fused through coke combustion in a cupola heated to over 1,500 °C.
 
3. Fibre drawing / Binder: The fibre is drawn by projecting glass on high-speed rotors. A binder is automatically atomized on the fibers and the fibre core is placed in a pressurized chamber to form a homogeneous primary sheet. This blanket is then transported to the batting installation.
 
4. Batting creeping: The arm stacks the stone wool zigzagging perpendicularly on a mat underneath. Batting increases the number of layers to achieve a wider range of basis weights. Using a roller system, the multi-layer wool blanket can be directed and compressed. Crimping straightens the fibres to improve their mechanical characteristics.
 
5. Polymerization: The binder-impregnated products are transported to an oven heated to over 200°C. The hot air that passes through the stone wool blanket polymerizes the resin, which gives the blanket its final thickness and consistency. 
 
6. Packaging / Palletization: Once out of the oven, the blanket is cut to the required width. Any edge waste is recycled during the manufacturing process. The stone wool blanket can be covered with a paper or aluminium covering, or a glass or asphalt mat.