Friction spinning apparatus.

摘要

Friction spinning apparatus comprises a fibre feed duct (2) having a secondary suction port (13) which is linked to a source of suction by way of a second perforated region (10) of the perforated roller (1). The secondary air passage (13) is communicated to a source of the suction by way of the second perforated region (10) having a suction opening (11) formed in a masking sleeve therewithin. Yet a further masking sleeve radially inwardly of the first has two differently sized holes (7) and (8) for changing the volume of air flowing through the hole (11) and hence changing the airflow rate through the secondary air passage (13). The secondary air passage (13) can be relatively large in cross-section and the flow constriction of the secondary air path can be by way of the second perforated region (10) of the roller (1) which is self-cleaning and hence avoids blockage of the secondary air path.