Quartz slab producing flow

Quartz-slab Production Flow (step-by-step, in English)

1. Raw-material preparation  

   • High-purity quartz grit / powder (SiO₂ ≥ 94 %)  

   • Unsaturated polyester resin (6–8 %), pigments, coupling agent, initiator 

2. Weighing & batching  

   • Automatic silos and weigh-belts dose each ingredient to the gram; recipe is locked to guarantee color repeatability 

3. Intensive mixing  

   • Planetary or high-speed paddle mixer blends resin, quartz and colorants for 3–5 min until the mix is homogeneous and free of lumps 

4. Even distribution (spreading)  

   • The wet mixture is conveyed into a moving hopper that scatters it uniformly across a steel mold or carrier frame 

5. Vacuum–vibro-compression  

   • Mold enters a vacuum chamber at –0.1 MPa; simultaneous 100–200 Hz vibration and 50–100 t pressure removes air voids and densifies the slab 

6. Thermal curing  

   • Green slab travels through a 90–110 °C tunnel oven for 40–60 min; resin cross-links and the board becomes rigid 

7. Cooling & rough trimming  

   • After 24 h cooling, the slab is flipped, edge-trimmed and inspected for warpage 

8. Calibrating (thicknessing)  

   • Multi-head diamond calibrators grind both faces to the exact thickness (±0.3 mm) 

9. Polishing  

   • 12–36 progressively finer diamond heads create the final gloss (40–70 GU) or matte/honed finish 

10. Quality check & defect repair  

    • UV lamps detect micro-cracks; tiny voids are filled with color-matched resin 

11. Cutting to size  

    • Bridge saws or water-jet tables cut the 3.2 m × 1.6 m master slab into customer dimensions 

12. Packaging & warehousing  

    • Slabs are film-wrapped, edge-protected with foam, palletized and stored vertically on A-frames ready for shipment 

The entire line—mixing through final cut—is PLC-controlled, giving a cycle time of ~30 minutes per slab on modern continuous presses.