Impact of a Saw-type Lint Cleaner’s operation on Fiber Quality Sanh Le, Ph. D. Cotton Ginning Laboratory Stoneville, MS

Objective Study fiber quality produced by saw-type lint cleaners subjected to various machine operation conditions, moisture levels and cotton varieties.

Test method Lint cleaner operation: – Saw speed: 877 and 1215 rpm – Feed rate: 447 and 745 kg/m/hr –Combing ratio: 25 and 50 Cotton variety: – STV4892 (hairy leaf) – DPL555 and DPL105 (smooth leaf) Moisture content: 4 and 6%

Ginning sequence

Analytical method Proc Mixed of SAS Significance level p = 5% Least Significant Difference (LSD)

Results Moisture content: –Desired 4 and 6%: Achieved: –L level: 4.1% % –H level: 5.3% %

Source of variance Year and treatment level Saw speed, rpm L = 877 H = 1215 Feed rate, kg/m/hr L = 447 H = 745 Combing ratio L = 25 H =50 Variety L = Hairy leaf H = Smooth leaf Moisture content, % L = 4 H = 6 Property Length, cm 2003 L a2.69 b 2003 H b2.73 a 2004 L b H a2.78 Uniformity, % 2003 L a80.6 b 2003 H b81.2 a 2004 L a H b81.7 Rd 2003 L b79.6 a 2003 H a78.9 b 2004 L b78.9 a 2004 H a78.6 b HVI

Source of variance Year and treatment level Saw speed, rpm L = 877 H = 1215 Feed rate, kg/m/hr L = 447 H = 745 Combing ratio L = 25 H =50 Variety L = Hairy leaf H = Smooth leaf Moisture content, % L = 4 H = 6 Property Yellowness 2003 L a b8.0 a 2003 H b a7.9 b 2004 L b H a7.9 Area, % 2003 L a b a b 2003 H b a b a 2004 L a b a a b 2004 H b a b b a Leaf 2003 L3.4 a3.1 b a2.9 b 2003 H2.9 b3.3 a b3.4 a 2004 L a 2.9 b 2004 H b 3.0 a

AFIS Source of variance Year and treatment level Saw speed, rpm L = 877 H = 1250 Feed rate, kg/m/ hr L = 447 H = 745 Combing ratio L = 25 H =50 Variety L = Hairy leaf H = Smooth leaf Moisture content, % L = 4 H = 6 Property Length by weight, cm 2003 L a a2.33 b 2003 H b b2.39 a 2004 L a a2.40 b 2004 H b b2.44 a Upper quartile length, cm 2003 L H L a b2.90 b 2004 H b a2.93 a Short fiber content by weight, % 2003 L b b10.07 a 2003 H a a8.85 b 2004 L b 6.41 b8.70 a 2004 H a a8.04 b

AFIS Source of variance Year and treatment level Saw speed, rpm L = 877 H = 1250 Feed rate, kg/m/hr L = 447 H = 745 Combing ratio L = 25 H =50 Variety L = Hairy leaf H = Smooth leaf Moisture content, % L = 4 H = 6 Property Nep/g 2003 L a248.8 a 2003 H b211.9 b 2004 L225.8 a b180.5 b245.4 a 2004 H244.4 b a289.7 a224.8 b Seed coat, nep/g 2003 L a8.3 b 2003 H b9.4 a 2004 L10.0 a a9.0 b 2004 H8.9 b b10.0 a Dust/g 2003 L253.9 a205.1 b a187.7 b 2003 H199.2 b248.1 a b265.5 a 2004 L348.4 a303.3 b328.5 a355.6 a280.3 b 2004 H280.7 b325.8 a300.6 b273.5 b348.8 a Visible foreign matter, % 2003 L1.1 a1.0 b a0.8 b 2003 H0.9 b1.1 a b1.2 a 2004 L1.4 a a1.1 b 2004 H1.1 b b1.4 a

Turnout and efficiency Source of variance Year and treatment level Saw speed, rpm L = 877 H = 1215 Feed rate, kg/m/hr L = 447 H = 745 Combing ratio L = 25 H =50 Variety L = Hairy leaf H = Smooth leaf Moisture content, % L = 4 H = 6 Property Turnout, % 2003 L b39.8 b 2003 H a40.5 a 2004 L38.3 a b37.8 b 2004 H37.8 b a Lint cleaner waste, % 2003 L0.82 b b 2003 H1.26 a a 2004 L0.55 b b 2004 H0.83 a a Lint cleaner efficiency, % 2003 L52.5 b a 2003 H60.2 a b 2004 L45.5 b b49.8 a H53.6 a a49.2 b49.3

Fiber Quality Prediction Level Speed, rpm L = 877 H =1215 Combing ratio L = 25 H = 50 Variety L = hairy leaf H = smooth leaf Moisture content, % L = 4 H = 6 Turnout, %, L +x-- H -x++ Cleaning efficiency, % L --++ H ++-- Length by weight, cm L xx+- H xx-+ Short fiber content, % L x --+ H x++- Neps L ---+ H +++- Reflectance L xx-+ H xx+-

Conclusion Results from the two-year tests were consistent Lint cleaner operations affected mainly turnout and cleaning efficiency Fiber quality was mainly affected by variety and moisture content