spruttryck

Spruttyck is the pressure used to propel a material through a spray nozzle in spray applications such as shotcrete (sprutbetong) and plastering. It can refer to the hydraulic or pneumatic pressure at the nozzle, supplied by pumps and/or compressors. In wet-mix shotcrete, the material is pumped under pressure to the nozzle, while in dry-mix shotcrete the dry material is conveyed by compressed air and entrained as it exits. Spruttryck is a key parameter because it influences adhesion to the substrate, compaction of the sprayed layer, and the overall quality of the sprayed surface. It also affects the amount of rebound and dust, the penetration into irregularities, and the thickness control.

The appropriate spruttryck depends on many factors: the type and viscosity of the material, the size and type of nozzle, the stand-off distance, the spray angle, whether the operation is wet or dry, and the air-to-material ratio. Operators adjust the pressure together with pump rate and nozzle selection to achieve the desired layer density and bonding, while meeting safety and productivity requirements. Measurements are taken with pressure gauges on the nozzle line or controller, and process controls often use surface tests, rebound coefficients, and coring to verify quality.

Spruttyck is used in civil engineering, mining, tunneling, and repair work where sprayed concrete or mortar provides rapid lining or stabilization. Standards and best practice guidelines exist to ensure consistent performance and safe operation.