Chapter Notes 4-10 - Process Functions/Objectives Bale...

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Functions/Objectives Main Parts Influencing Factors Additional Information The Opening Room Bale laydown preparation, placement, and replenishment Feeding of bale stock through machines Mixing/homogenizing fibers Blending by weight Cleaning impurities from fiber tufts with minimal damage Top feeder Heavy particle separators Hopper feeder Tuft size Stock production rate Process machinery run time Fans and condensers for stock transport Bales must be conditioned for at least 24 hours Humidity (50-60% for natural, 40-50% for synthetic) Average laydown size is 40 for cotton and 24 for synthetic Blending – the process of preparing homogenous mixtures, usually with specific proportions, of two or more generic fibers or variants of fibers Mixing (folding) – the mechanical stirring of fiber tufts to accomplish the intermingling of tufts from different sources with the objective of producing consistent fiber arrangements over extended time periods The Carding Process Separate fibers individually Arrange fibers in a somewhat longitudinal direction Remove contamination Reassemble the fibers into a continuous strand of uniform weight and quality (sliver) Coil the sliver into a suitable transport container Fine opener – feeds the stock to the card Feed chute – forms a mat or fleece of fibers that when delivered to the feed table have even mass, is well opened, and in a uniform manner Feed roll/feed plate – feeds the compressed fiber mat into the card; roll turns, plate is stationary Lickerin – reduces size of fiber tufts Flats Main cylinder – breaks down and straightens individual fibers Doffer roll – transfers a portion of the fibers on the cylinder; condenses/disorients fibers; reverses fiber ends to give trailing hooks Stripping roll – removes the fiber web from the doffer Trumpet and calender roll – pulls the strand through the trumpet and compresses/compacts the fibers into a tighter strand Crush rolls – used to pulverize bulky contaminants in fibrous material Card mat openness – higher degree of openness makes separation easier at the lickerin Card mat weight Lickerin zone – generally set over aggressive Waste removal uniformity Flat strip weight Cylinder and flat wire Doffer wire loading Tension draft on web and sliver Slub generation Production rate and sliver weight A large percentage of hooks are formed in the fibers at the lickerin teeth and remain as they are formed into the sliver, making it impractical to spin yarn directly from card sliver The removal of non-lint contaminants is accomplished at the lickerin as heavy particles are thrown out by centrifugal force The accumulation of lint tags causes slubs to be introduced into the sliver which ruin efficiency and product quality Processes reach ~120mph Paper and nonwovens are also produced
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This note was uploaded on 09/12/2011 for the course PTFE 3200 taught by Professor Dr. during the Spring '11 term at Georgia Institute of Technology.

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Chapter Notes 4-10 - Process Functions/Objectives Bale...

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