Rometa Block Making Machines: 600 to 3,000 Blocks per Hour

Sand, gravel (aggregates), water and cement, with common gradings of 0-2 mm, 2-4 mm and 6-8 mm (maximum size around 8 mm) to achieve a balanced mix. Washed sand 0-3 mm, sand with fines 0-3 mm and fine gravel 3-8 mm can also be combined depending on the application. Correct dosing is key to the strength, durability and final finish of the piece.

The usual maximum height is 300 mm, reduced to 250 mm for very slender pieces with thin walls. Rometa's technical team can design machines for taller pieces, up to 500 mm, depending on the project.

Four main factors: face fineness (depending on the aggregate size used), density or weight (depending on vibration, aggregate quality and cement amount), dimensional accuracy (depending on machine quality) and thermal insulation (depending on aggregate, density and mould design). With the right parameters, a 40x20 block can reach strengths of up to 80 tonnes.

Between 24 and 48 hours in the dryer, where the heat given off by the piece itself maintains proportional curing without drying it out or cracking it, with no need for extra water. Steam can also be added to speed up the process, though it complicates the plant and pallet maintenance.

Rometa supplies the moulds, though locally made moulds can also be used with the dimensions Rometa provides (for pavers, hollow-core blocks, blocks, kerbs, walls and other pieces). Pieces are produced on wooden pallets ranging from 1200x600 to 1200x1200 mm, which the plant cleans, greases and turns automatically. The number of pallets needed depends on daily output: the dryer must cover at least 1.5 days of production. Rometa works with moulds from different countries of origin (Spain, France, Italy and Germany), depending on the type of piece and the client's needs.

Aggregates and cement are stored and mixed in set quantities (three aggregate gradings, cement and water) until a homogeneous mix is obtained, which the vibro-compactor doses into the mould on a wooden pallet. The machine vibrates the mould during filling and applies stronger vibration during compression to remove air from the mix. The pallet with the wet piece then goes to natural drying (24-48 hours, avoiding sun and wind) and, once dry, the piece is palletised onto a pallet while the wooden pallet is cleaned, turned and greased to go back to the machine.

Blocks, hollow-core blocks, kerbs, pavers, channels, partition blocks and other shapes, depending on the mould fitted. The same machine accepts different moulds. The limit is set by the tray's usable area, which ranges from 1100×600 mm (Rometa 1010) to 1400×1200 mm (Rometa 4050) depending on the model.

It can be metal, concrete or mixed construction, fixed or mobile depending on the available building. Dryers must be enclosed or under cover to avoid sun and wind; Rometa provides the construction drawings as part of its technical support. Drying is natural (no added heat or humidity), and the recommended minimum capacity equals 1.5 days of production.

All movements are driven by a high-performance hydraulic unit, and mould vibration (key to concrete compaction) is produced by four counterweighted shafts, moving vertically, unidirectionally and fully synchronised. This system achieves homogeneous compaction that improves the piece's final quality.

Typically 3 daily shifts of 7 hours, plus 1 hour per shift for cleaning, greasing and mould changes, reaching up to 20 hours a day of effective production while keeping optimal operating conditions. In real-world conditions, output typically falls between 80% and 85% of the machine's maximum theoretical capacity, with a variation of around ±15%.

Yes. Rometa's modular design lets you start with an initial setup (mixing, production machine and transport cart) and expand it progressively as production needs grow, reusing up to 90% of the initial investment without replacing the whole system.

Up to 600 units/hour, with 60 kW of installed power. It's the entry-level plant in the Rometa range, designed for producing blocks, hollow-core blocks and pavers with simple assembly and fully automatic operation.

Up to 900 units/hour, with 80 kW of installed power. It's an automatic machine with medium-high capacity and built-in automatic palletising.

Up to 3,000 units/hour, with 170 kW of installed power. It's the highest-output model in the range, with 4 servomotors and automatic palletising.

Up to 1,500 units/hour, with 100 kW of installed power, for medium-high production of blocks, hollow-core blocks and pavers, fully automatically.

Up to 1,800 units/hour, with 125 kW of installed power. It is compatible with double layer (Face Mix) and has fully automatic operation for high-capacity production.