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

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

3. 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%

4. Ginning sequence

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

6. Results Moisture content: –Desired 4 and 6%: Achieved: –L level: 4.1% + 0.32% –H level: 5.3% + 0.21 %

9. 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 L2.722.71 2.72 a2.69 b 2003 H2.71 2.70 b2.73 a 2004 L2.792.78 2.76 b2.77 2004 H2.77 2.79 a2.78 Uniformity, % 2003 L81.080.880.982.1 a80.6 b 2003 H80.981.0 79.7 b81.2 a 2004 L81.681.581.682.7 a81.3 2004 H81.4 80.3 b81.7 Rd 2003 L79.079.679.178.3 b79.6 a 2003 H79.478.979.380.1 a78.9 b 2004 L78.778.878.676.4 b78.9 a 2004 H78.8 81.1 a78.6 b HVI

10. 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 L7.98.0 a7.97.8 b8.0 a 2003 H7.97.9 b7.98.0 a7.9 b 2004 L7.9 7.6 b7.9 2004 H7.9 8.1 a7.9 Area, % 2003 L0.0276 a0.0235 b0.02520.0308 a0.0195 b 2003 H0.0223 b0.0264 a0.02470.0190 b0.0303 a 2004 L0.0319 a0.0278 b0.0306 a0.0326 a0.0250 b 2004 H0.0260 b0.0300 a0.0273 b0.0253 b0.0328 a Leaf 2003 L3.4 a3.1 b3.23.6 a2.9 b 2003 H2.9 b3.3 a3.12.7 b3.4 a 2004 L3.0 3.0 a 2.9 b 2004 H3.0 2.9 b 3.0 a

11. 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 L2.362.37 a2.362.41 a2.33 b 2003 H2.362.35 b2.362.31 b2.39 a 2004 L2.432.43 a2.432.45 a2.40 b 2004 H2.422.41 b2.422.39 b2.44 a Upper quartile length, cm 2003 L2.87 2.84 2003 H2.86 2.89 2004 L2.922.93 a2.922.89 b2.90 b 2004 H2.912.91 b2.912.95 a2.93 a Short fiber content by weight, % 2003 L9.449.20 b9.477.75 b10.07 a 2003 H9.489.72 a9.4611.17 a8.85 b 2004 L8.248.20 b 6.41 b8.70 a 2004 H8.508.54 a 10.33 a8.04 b

12. 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 L224.7233.6227.2234.7 a248.8 a 2003 H236.1227.1233.6226.0 b211.9 b 2004 L225.8 a232.0224.7 b180.5 b245.4 a 2004 H244.4 b238.2245.5 a289.7 a224.8 b Seed coat, nep/g 2003 L9.28.89.010.0 a8.3 b 2003 H8.58.98.77.7 b9.4 a 2004 L10.0 a9.69.411.9 a9.0 b 2004 H8.9 b9.39.67.0 b10.0 a Dust/g 2003 L253.9 a205.1 b230.5286.1 a187.7 b 2003 H199.2 b248.1 a222.7167.0 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 b1.01.3 a0.8 b 2003 H0.9 b1.1 a1.00.7 b1.2 a 2004 L1.4 a1.21.31.5 a1.1 b 2004 H1.1 b1.31.21.0 b1.4 a

13. 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 L40.139.839.937.4 b39.8 b 2003 H39.740.039.9042.4 a40.5 a 2004 L38.3 a38.038.137.3 b37.8 b 2004 H37.8 b38.138.038.7 a Lint cleaner waste, % 2003 L0.82 b1.071.021.080.99 b 2003 H1.26 a1.011.061.011.09 a 2004 L0.55 b0.700.680.790.66 b 2004 H0.83 a0.680.700.590.72 a Lint cleaner efficiency, % 2003 L52.5 b57.255.756.658.6 a 2003 H60.2 a55.557.056.154.0 b 2004 L45.5 b49.647.5 b49.8 a49.7 2004 H53.6 a49.451.6 a49.2 b49.3

14. 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+-

15. 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