ptfe3720 test 1 - PLEASE CIRCLE THE CORRECT ANSWER l A unit...

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Unformatted text preview: PLEASE CIRCLE THE CORRECT ANSWER l. A unit used to express a measure of linear density is the ,ar‘ the length in grams of 9000 meters b.” the unit that was developed by the Dutch to represent fib (Q the weight in grams of 9000 meters d. used instead of weight 6. None of the Above 2. Which has a larger mass to length ratio? a 1 denier fiber a. 1 denier fiber Cb; 1 tex fiber ‘ 2:. they are the same (1. cannot be determined 3. What is the definition of a staple yarn? a. continuous fibers that are melt spun 2b. :Fibersl that are from 4 inches to 8 inches long ((3 Fibers of short length d. Yarns that are stiff like a staple that is used t( 4. What is the purpose of the opening/cleaning/blendin a. To move the fibers through the plant efficien processing b. T o compact the fibers in the bale (0;) To open the bale, remove trash and individua d. To remove the short fibers and twist the fiber 5. When making continuous filament yarns, what meth» fibers together? («’17, twisting Cb) Melt spinning c. air-jet entanglement 6. What is the input into the cardng process for staple j ~~~a.~—~ sliver“ 0's» W17”? b. roving 0. Continuous fibers that are melt spun and text (82) Fibers that have been through the opening/cl: Q0 *5/ LIDQmer PTFE 3720 Quiz 1b September 17, 2009 ———__. . I . l. I r 3/ 7—f- r“ Name I l" 010:. 1'! \Jtijr‘rit’k _ Y) I if“; -\\jr<‘}Ifl-‘J‘ : I-II'I ' By signing below, you indicate that you will not discuss this quiz with anyone until after TUESDAY, September 22, 2079. . .- / 7 ‘ a ‘ 454 g = 1 pound 1 meter =_ 1.09 yards 1. 4 pts What' IS the denier for a nylon monofil'ament yarn that has a diameter of 0 25 mm? Assume, that the density for nylon Is 1.19 g/cm3 (show all work). 000?) l WOO?“ Imm‘o LO 001g)? : Ll’ Deni-CK :1 I Ogo W31: Dani/2r" 3- mrmwom I I OS8r> | - DDLDI‘H , .. "I"—T”‘"~.”"—""-i" F .5 :32 -‘~:-‘ DIII'I‘IIV ‘ I ' - - - .. - usage“ 2. 4 pts What Is the cotton count for a cotton yarn that has a diametergig 5 mm (Assume that the density of the yarn is 0 91 glam.3 )? Show all of your work. «3000?; J’l'w I . HIM? :L\Dmh€(‘ <l48sz3IIr TTI. 413300“; . y ‘18 fl— . II I ' ' I _l '14; a- .. __ - :.:II ‘00 lg 000m 9104 0&5 bl 3w IIs’II <3 -~ ~97 %. 3—?“ I obton Low/73$ 3. 4 pts What length of 1400 denier fiber can be made from 100 pounds of polyester? Assume that. the density of polyester Is 1. 38 g/ crha (show all work). ~ 3,5: ‘l __'.III-_ I?) I .. i h I "-"I"-'I) I ’lhqj : Br.) (I...- ' .. ' “" "‘ ‘-*-'1'-'*-r-"~-~L-—-'--i<‘- ‘3 I. a," ’.- . .I ' 'l' r __ ‘l -. ' _ ‘. " ' I ' E.I :3; f/ ‘3 _ . -..IU.1) IE .I‘k . 1". _;Z I ' I r \ .'\ ‘.‘ l ,1 ' If; - - -. l I! ‘ ~ :’: ‘ I" '. Ila”. ' . - .3 'g 130135.}; f I" f 'X“ "' Nanak/I 10. Specific Stress is defined as a. F/A b. F/Ao c. A/F F/n 11. Nylon is made from which ofthe following processes? a. Dry Spinning b. Air-Gap Spinning @ Melt Spinning d. Gel Spinning 12. Typical Coke and water bottles are made of which one of the following polymers? a. nylon b. acrylic @ Polyethylene Teraphthalate d. polyurethane 13. The flexibility (how easy it is to bend a fiber) is related to? -.__: -; 3a. the fadlhs'linearly b. the color of the fiber (3) the radius to the 4th power ' . the type of fabric that it is in 14. The rings around the coke bottles that we looked at in class showed ”necking" when we pulled on them. What is‘the term used to describe this behavior (when the same amount of force causes the sample to keep growing in length)? a. bottling b. stretch ,V/cfi creep d. forcing 15. Which of the following fiber processing methods requires a volatile solvent? a. Melt Spinning b. Wet Spinning C9 DrySpinning d Air-gap Spinning 16. When a di-acid is reacted with a di—amine to form a polyamide, what molecule is released? a. nothing fb water \‘c. sulfur dioxide d. carbon dioxide e. a double bond , 25. The dye goes into the part of the polymer? a. crystalline b. white @ amorphous d. unpolymerized 26. Tex is the weight in grams of what length of fiber? a. 1000 yards b. 1mile c. 9000m 1000 m 27. If a fiber has a high initial modulus, it means the fiber will a. require a lot of energy to break be relatively stiff c. be able to strain long distances d. absorb water ”’26 What process is used in fiber spinning to orient the molecules? @ Drawingor d ra'fting‘f . b. Rolling c. Spin-casting (9?, Cross linking 29. What is resiliency with resped to polymer fibers? ~ Ability of afiber to spring back after distortion '., Ability of a fiber to adsorb water. ' c. Ability of a fiber to absorb water d. Ability of a fiber to withstand a great force when pulled 3K. Whattwa things are combined to form Nylon 6—6? a") Any di-acid and di-amine Rig?) Adipic acid and heximethylene diamine c. Nylon6 and caprolactam d. Two molecules that have a cystine linkage 31. If a fiber shows wicking behavior, it is demonstrating its ability to Water? a. repel ' b. absorb k? adsorb ‘ 7. evaporate 32. Which fiber would typically have the highest crystallinity? a. polyester b. Nylon 6,6 c. Nylon 6 id”) Kevlar 41. A knitted fabric is . a. made by interlacing yarns b. made by weaving the fibers together c. not made from yarns @ made by inter-looping yarns 42. A woven fabric is a. Typically more flexible than a knitted fabric Typically more stable than a knitted fabric c. Not made from synthetic fibers d. Typically absorbs more moisture than a knitted fabric % As the linear density of a polyester polymer fiber (measured in denier) goes up, , Q? The cOtton count also goes up b. The tex decreases linearly . (29 The diameter‘of the‘fiber goes up d.- The density of the fiber goes up; 44. Name an example ofa long staple fiber ‘ T- ? Wook 45. A screw extruder is a piece of processing equipment used in what type of fiber spinning. a. Dry spinning Melt spinning c. , Wet spinning d. Ring spinning 33. Name one fiber that is made by wet spinning. l/LOUJ (Wk 34. As you increase the amount of twist in a yarn, you also typically a. Decrease the diameter of the yarn b. Increase the strength of the ya m c. Increase the cost of the yarn {D All of the above e. None of the above 35. Name two reasons that you may want to texture a yarn or fiber. 1% MAP tx “\on Biz-our Ldam %mr%e( b. TL) t l , (LU 1J2. L {O U k g l ,1" < l": livl EWLQ, (41": 4 :1 (1‘; 1‘15: . L 1.; 1‘) y/ '77. (1)] 1t f ! . i J \j , e \\ '93 (’1: b {-67 TD git“ (49:4;47 m -’,.“L..‘/lv0 ll”) I1 ”j 5 (J ‘2 ‘ _" \l 'j W < :' “If.-. / 4 J 36. What is the purpose of the ”card" in staple yarn manufacturing? L3,) To remove trash and align fibers ' To take out the long fibers ' c. To form a roving d. To package the fibers for transporting them 37. What is the first step in converting a bale of fibers into a yarn? Opening b. Carding c. Roving d. Spinning e. sorting 38. Wh ould you want to blend different bales of fibers together? as! To make a consistent product over time b. To decrease the price of producing yarns c. To avoid an extra processing step later d. To increase the price of your product 39. What is a thermoset polymer? a. A polymer that is only used in high temperature applications. b. A polymer that must be heated up before it will polymerize c. A polymer that has reached a temperature of 1000 degrees C and does not burn A polymer that is set and cannot be melted and reprocessed because it has been cross finked .2 40. A vinyl polymer is made from monomers that have? {faQ‘A carbon-carbon double bond ii. A cystine linkage c. An amine d. A very high functionality 17. Denier is the weight in grams of of fiber? a. 9000 cm b. 9000 ft @ 9000 m d. 9000 km g Which of the following is a unit of strain? a. g/denier 8/"? c. m2 @ it has no units 19. What is the name of the following functional group: COOH? a. olefin b. amide Cc;\ acid d. propylene 20. Which of theifollowin'g is a linkagepresent in Nylon? a- ester — C9 amide . alcohol d. aldehyde 21. To form a cross linked polymer, you must have some monomers with a functionality of a. One b. Two @ Greater than two d. It does not matter 22. Which of the following Is a fiber texturing method? a. Gear Crimping b. Stuffer box crimping ‘ c. False Twist All of the above 23. If you want a fiber that requires a large amount of energy to break, what material property should you look at? a. yield stress b. break elongation toughness d. Young’s modulus 24. What type of bond connects monomers to make polymers? a covalent ' . hydrogen c. Van der Waals d. ionic x? 4. 4 pts Draw a typical cross section fOr the following fibers? 3. Cotton 6 b. A dry spun fiber such as acetate c. A melt spun fiber used in carpet <4 5. 4 pts In a tensile test, the stress-strain curve is used to show the results of the test. Draw a 4 ‘Lwfiwlfi' typical stess-strain curve and identify the following features: ‘. ,-[ AI - i; ‘2 DUO "id-39¢- LN 0(LL' o ,a.’ initial modulus '-. _I' l.‘ IQ. . I l .bz’: Tensile strength .I:.-. :11 , - E longafll. 'f“ (if I" Tenacity i" :‘In I we? i mm.) 35- /’]/,‘( : Failure scam I“. .u-‘I..- -.I -_I m I: ,e: Elongation at break j)" Work of rupture -' 'I.; '-_ I- ‘I:".."1t'.'J-"r Ig. Toughness 5.4.5? ' __ . ,. _ Wm} {A ’1" 4" Questions 6-45 are worth 2 points each. ' _6_. A composite is made ofa and a a. Polymer and metal b. Solid and a gas c. Matrix material and reinforcement material At least four different materials and a polymer 7. Define IStrain (show formula). Strum _ . 9i 8. Whichis not a method of spinning fibers? . Melt Spinning Crys‘tallization spinning c. Air-Gap Spinning .. d. Dry Spinning 9. Engineering Stress' Is defined as a. F/A Fon .c.. 'A/F‘ d. F/n ...
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