11—THE EFFECT OF BACKDRAFT APPLIED AT THE FIRST GILLING OPERATION AFTER WORSTED CARDING

Abstract

The application of backdraft at the first gilling operation after carding results in significant reduction in percentage noil and an increase in the mean fibre length of the top. These effects depend on the backdraft and direction of feed. Percentage noil is also dependent on backratch but is independent of the faller-bar pinning density. Measurements are also given to show how back-roller force is affected by backdraft, backratch, and the total free space between the pins and the fallers.

KEY WORDS (SPECIFIC TERMS):

• BACKDRAFT
• GILLING
• WOOL
• NOILS
• NOIL PER CENT
• BACKDRAFT
• BACKRATCH
• MEAN FIBRE LENGTH
• FRONT DRAFT
• GILLBOXES
• INTERSECTING GILL-BOXES
• FALLER BARS
• SLIVERS
• TRAILING HOOKS
• HOOKED FIBRES
• SLIVER REVERSALS
• IRREGULARITY
• COEFFICIENT OF VARIATION
• DRAFTING FORCE
• PINNING DENSITY
• PIN DRAFTING

KEY WORDS (BROADER TERMS):

• WORSTED-SYSTEM PROCESSING
• DRAFFING (STAPLE FIBRE)
• DRAFTING MACHINES