Rock wool production

Rock wool is an amorphous silicate obtained from rock and is a very versatile material used above all in construction industry and for insulation in the nautical industry.

The rock wool production process starts with the crushing of mainly basaltic rocks, which are further crumbled and mixed with limestone and other elements and, finally, smelted. The smelted rock is transformed into fibres and sprayed with resin and oil. After the rock wool fibre production stage, the compound is heaped in overlapping layers on conveyor belts that transport it into a furnace for polymerization: the rock wool layer is reduced in thickness and dried to allow the binder to harden. The rock wool mats leaving the furnace are uniform and are then cut and packaged.

Costacurta supplies both drilled plates, used mainly in the production part of rock wool fibre, and conveyor belts, for the formation of the mat.

Polymerization ovens

Costacurta conveyor belts are used in polymerization ovens to guarantee a reduction in the thickness of the rock wool mat and its chemical/physical uniformity when it leaves the machine.

Belts for polymerization ovens consist of a set of solid drilled sheets (shutters) that are hinged to each other in order to guarantee belt continuity; they are assembled on the edges of the chains for transport. The design of the holes and linearity of the panels (and belt) surfaces allow efficient heat exchange at the same time ensuring the uniformity of the insulating mat exiting the oven.
The type of slat conveyor belts used depends on the type of mat to be obtained. Carbon steel slat conveyor belts with a solid structure are preferable for very thick mats (10-15 cm approx.), while stainless steel slat conveyor belts with a less solid structure are preferable for thinner mats (1-2 cm approx.).

Other straight conveyor belts made by Costacurta are also used in the production of the rock wool covering used for pipe insulation.

Distinctive characteristics of the Costacurta belts for polymerization ovens are:

  • Precision of the design and the drilling and levelness of the perforated elements
  • Precision in the construction of the hinges for joining the perforated elements that form the conveyor belt
  • Precision of the mesh geometry and quality of the materials used

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