dryjet

Dryjet (also written dry-jet) is a term used in several industries to describe a process that delivers material through a jet while maintaining a relatively dry condition, often with an air gap between the extrusion point and downstream processing.

In polymer fiber manufacture, dry-jet spinning (sometimes called dry-jet wet spinning) refers to extruding a polymer dope through a spinneret into an air gap before entering a coagulation bath. The air gap allows partial solvent evaporation and increased molecular orientation, which can influence fiber strength and texture.

In civil engineering, dry-jet grouting (DJG) is a ground-improvement technique in which cementitious material is injected under high pressure through a jet. The process often uses predominantly dry cement powder with limited water at the nozzle, so little slurry forms until mixing occurs at depth, producing grout columns or piles.

The exact meaning of dryjet depends on context, and the term is not universally standardized across industries. Readers should consult discipline-specific literature or supplier specifications for precise procedures and performance characteristics.