The upper aprons are short and made either of leather or more commonly of synthetic rubbers. They have a thickness of about 1 mm and are held by tensioning device.
The lower aprons are longer and usually made of leather. They run over the guid+ bar, usually known as nose bar, to position close to the delivery roller.
Function:
The aprons co-operated with each other t guide and transports the fibers during drafting and they exert a very significant influence on the drafting operations.
The top roller must be pressed with relatively high force against the lower rollers to ensure the guidance of fiber.
Pressure are in the range of 100 to 250 N per roller which may vary as per raw material and its volume.
Pressure is applied by spring pressure, pneumatic weighting, magnetic weighting.Condenser:
Feature:
•Condensers are mounted on a reciprocating bar behind the drafting arrangement.
•The second condenser is provided in break draft field.
•And the 3rd one is located in main draft field.
Function:
•Spreading sliver masses are condensed to improve evenness and lead to drafting zone.
Advantage:
•Reduce the high fly level and hairiness of roving.
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