Typical Dry-Spinning SystemsPolymerConcentration(%)FiberSolvent20-30Acetateacetone+2-6%water20-22Triacetatemethylenechloride+5%methanolAcrylic25-32Dimethyiformamide25-30ModacrylicAcetone25-30Dimethyiformamide35PVCcarbondisulfide+acetone(40:60)acetone+benzeneAcetonevinylchloride-vinylacetatecopolymer20-35ElastaneDimethylformamide20-25Dimethylacetamide15-20Poly (m-phenylene isophthalamide)Dimethylformamide+5%LiClPolybenzimidazoleDimethylacetamide
Fiber Solvent Polymer Concentration (%) Acetate acetone + 2-6%water 20-30 Triacetate methylene chloride + 5%methanol 20-22 Acrylic Dimethylformamide 25-32 Modacrylic Acetone 25-30 Dimethylformamide 25-30 PVC carbon disulfide + acetone (40:60) 35 acetone + benzene vinyl chloride-vinyl acetate copolymer Acetone Elastane Dimethylformamide 20-35 Dimethylacetamide 20-25 Poly (m-phenylene isophthalamide) Dimethylformamide + 5% LiCl 15-20 Polybenzimidazole Dimethylacetamide Typical Dry-Spinning Systems
Manufacturing Technologies>Gel spinning>Phase-separation spinning>Reaction-spinning (chemical spinning)> Spinning from emulsion and suspension>Deposition spinningH,+BCIHCIHgHgFiberWBoronFiberWoundartoDrum
Manufacturing Technologies ➢ Gel spinning ➢ Phase-separation spinning ➢ Reaction-spinning (chemical spinning) ➢ Spinning from emulsion and suspension ➢ Deposition spinning
Products andApplications>1.Rayon FiberProcess Description-Mostravonismadebythe viscoseprocess. Rayonfibers are made usingcellulose(dissolvedwoodpulp),sodiumhydroxide, carbon disulfide, and sulfuricacid.The series of chemicalreactions inthe viscoseprocess usedto make rayonconsists of the following stages
Products and Applications ➢1. Rayon Fiber Process Description – Most rayon is made by the viscose process. Rayon fibers are made using cellulose (dissolved wood pulp), sodium hydroxide, carbon disulfide, and sulfuric acid. The series of chemical reactions in the viscose process used to make rayon consists of the following stages:
V1. Wood cellulose and a concentratedsolution of sodium hydroxidereact to formsodacellulose.2. The soda cellulose reacts with carbondisulfide to form sodium cellulose xanthateV3. The sodium cellulose xanthate is dissolvedin a dilute solution of sodium hydroxide togive a viscose solution.V4. The solution is ripened or aged tocompletethe reaction.V5. The viscose solution is extruded throughspinnerettes into dilute sulfuric acid, whichregenerates the cellulose in the form ofcontinuousfilaments
✓1. Wood cellulose and a concentrated solution of sodium hydroxide react to form soda cellulose. ✓2. The soda cellulose reacts with carbon disulfide to form sodium cellulose xanthate. ✓3. The sodium cellulose xanthate is dissolved in a dilute solution of sodium hydroxide to give a viscose solution. ✓4. The solution is ripened or aged to complete the reaction. ✓5. The viscose solution is extruded through spinnerettes into dilute sulfuric acid, which regenerates the cellulose in the form of continuous filaments
HO0-OHCH2HOOHOHcaHOHOHO0-OHCH2HOOHOCH,OHHO0HOHHHHOHHOOHHOHglucose