Trumpets and Condensers
topic
Trumpets (also called guides or condensers) are funnel-shaped elements placed at the entry of each draft zone to consolidate the fibre strand width before it enters the nip. Trumpet bore diameter is selected relative to sliver/roving linear density: too small causes fibre breakage; too large fails to condense. Back-zone trumpets reduce sliver width from 8–12 mm to 3–6 mm; front-zone condensers (in compact spinning) reduce it to 1–2 mm.
Role
Trumpet and condenser selection is a simple but high-impact quality lever. Correct condensing reduces yarn hairiness (S3 hairiness index by 15–25%), improves yarn tenacity by 3–8%, and reduces fly generation in the spinning room — directly improving worker health conditions and reducing housekeeping costs.