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TT327 > PREVIOUS TEST > Flashcards

PREVIOUS TEST Flashcards

1
Q

why is roving necessary?

A

to reduce size, sliver is too big to come straight our of the drawframe and go immediately to spinning

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2
Q

what are the 5 actions in roving?

A
  1. Drawing: reduces size
  2. twisting: add cohesion/strength
  3. make roving: wind on a package
  4. laying: make sure there is not gaps
  5. building: properly shaped bobbin
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3
Q

what is balloonless spinning

A

we deflate the balloon and put a crown on-top of the spindle, the yarn goes through the crown and the crown forces the yarn to collapse around the bobbin without going too far out

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4
Q

8 influences of twist on yarn properties

A
  1. hand
  2. luster
  3. abrasion resistance
  4. absorbency
  5. special effects
  6. flexural endurance
  7. contraction
  8. strength
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5
Q

in ring spinning, the amount of tension on the yarn is due to what 6 factors

A
  1. yarn size
  2. yarn speed
  3. travelor speed
  4. travelor weight
  5. surface area of balloon
  6. ring spinning
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6
Q

what 3 things characterize twist in short staple yarns?

A
  1. twist angle
  2. twist direction
  3. s or z twist
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7
Q

list the 5 effects of reducing staple length

A
  1. short staple needs more twist
  2. not as strong
  3. more expensive
  4. less luste
  5. harder hand
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8
Q

T or F: In worsted spinning rings and travelers are sometimes lubricated to reduce friction and temp

A

T

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9
Q

T or F: in ring spinning, end breaks are a result of too little tension in the yarn and high yarn variability

A

F

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10
Q

T or F: ribboning in winding is due to the traverse shift being too large

A

F

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11
Q

T or F: in 2 for 1 twisting the second turn of twist is inserted as a result of the package turning

A

F

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12
Q

T or F: woolen ring frame spinning uses card roping

A

T

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13
Q

T or F: rubbing frames run about twice as fast as roving frame

A

T

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14
Q

T or F: in ring spinning the spindle speed lags behind the travelro speed to casue winding to occur

A

F

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15
Q

T or F:In the production of roving for producing woolen yarns single zone drafting and a slip-drafting system are used

A

F

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16
Q

T or F:in winding of roving onto a package, as the bobbin speed increases the flyer speed must also increase

A

F

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17
Q

T or F: the goal in splicing is to have the yarn diameter after splicing be no more than twice the original yarn diameter

A

F

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18
Q

list the 3 tyoes of irregularity in drawn sliver that are related to machine defects or poor maintence

A
  1. roller speed variation
  2. fiber slip
  3. roller nip movement
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19
Q

T or F: in open end spinning the rotor design and size is selected based on fiber type and desired production speed

A

F

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20
Q

T or F: compact spinning is a modification to the rotor spinning machine which allows for better twisting of edge fibers to create a stronger yarn

A

F

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21
Q

T or F: air jet yarns have a parallel core of cotton fibers held together by abdns of polyester wrapper fibers

A

F

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22
Q

T or F: ring spun yarns are stronger than open end spun yarns

A

T

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23
Q

T or F: tow to top changes filament yarns into baled fibers

A

F

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24
Q

T or F: edge crimping as a texturing method was not very successful because of the difficulty in getting large denier filaments to curl

A

T

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25
Q

T or F: fasle twist can be used to create both stretch and bulk yarns

A

T

26
Q

T or F: it is possible to extrude, draw and texture filaments in a one step process

A

F

27
Q

T or F: one reason for wanting new spinning methods was the fact that ring spun bobbins were too large for efficient shipping

A

F

28
Q

T or F: coarser air-jet yarns were determined to be stronger than finer air-jet yarns

A

F

29
Q

T or F: stacked disc fricition twisters used rubber bushings to genereated false twist yarns

A

F

30
Q

T or F: compact spinning allows a reduction in twist level while maintaining the yarn strength

A

T

31
Q

T or F: converting is a term used to describe the process of changing continuous filaments into staple fibers sliver

A

T

32
Q

T or F: in stretch breaking the tow is wrapped around the rolls to enhance fricition and reduce slippage

A

t

33
Q

T or F: stuffer box textured yarns are used in artificial turd becasue it gernerated a buckled crimp

A

F

34
Q

T or F: vortex spun yarns are more hairy than ring spun yarns

A

F

35
Q

T or F: simultaneous and sequential draw0texturing both use POY as the input material

A

T

36
Q

T or F: in compact spinning the twist triangle is enlarged so that more fibers are incorporated

A

F

37
Q

T or F: yarns textured using gear crimping maintained their crimp better than edged crimped yarns

A

T

38
Q

T or F: oepn end spun yarns are more even than ring spun yarns

A

T

39
Q

T or F: twist transference is used in the production of compact yarns to help hold the fibers together

A

F

40
Q

T or F: the guillotine method of cutting filament tow is used by most filmament staple producers becasue it is a simple procedure

A

F

41
Q

T or F: staple textured yarns can be produced from fully drawn yarns, partially oriented yarns and low orientation ayarns

A

F

42
Q

T or F: bulk and hairiness of a yarn can be changed by the type of navel used in open end spinning

A

T

43
Q

T or F: tight spots are untextured areas due to poor tension and teist contol

A

T

44
Q

are open yarns stronger or weaker than ring spun yarns and why?2

A

weaker because of bridge fibers and poor fiber orientation

45
Q

are open end yarns more or less even than ring spun yarns and why?3

A

more even because more doubling in lay in, no roving, and can chose amount of drawing processes

46
Q

do open end yarns have more or less elongation than ring spun and why?1

A

greater because of bridge fibers

47
Q

do open end yarns have a better hand than ring spun and why? 1

A

harsher hand than ring spun bc shorter fiebrs

48
Q

do open end yarns more or less bulky than ring spun yarns and why? 1

A

more bulky bc bridge fibers

49
Q

are open end yarns more or less hairy than ring spun and why? 1

A

more hairy bc bridger fibers

50
Q

6 attributes that were consider inportant for the ideal spinning system?

A
  1. good quality yarns
  2. spin from sliver
  3. fast
  4. cheaper
  5. produce large fault free packaages
  6. flexible in fiber and yarn types
51
Q

6 process phases in open end spinning

A 
feeding 
drafting 
fiber transport
twisting 
yarn removal 
winding
52
Q

7 process steps in texturing

A
  1. input fully drawn yarn
  2. heat above tg
  3. deform the yarn
  4. cool below tg
  5. reverse the deformation
  6. relax the yarn which is optional
  7. wind onto a package
53
Q

methods for feeding fibers in short staple fibers 3

A

incline
feed hooper
horizontal

54
Q

things to control with gridbars 3

A

air flow
distance
mounting/cleaning angles

55
Q

properties of air texturing 4

A

more bulky
higher mositure absorption
heat insulation
more elastic

56
Q

whihc is more bulky and has more elongation false twist or air tecturing

A

false twist

57
Q

intermingling

A

process where filament which may have been tectured are condolidation

58
Q

co-mingling

A

where several yarns are combined and consolidated

59
Q

torque balancing

A

using a torque jet to eliminate any residual torque liveliness from a textured yarn

60
Q

how to eliminate residual toruqe in false teist textured yarn 2

A

combine z and s textured yarn through intermingling

use a detorque jet after 2nd heater

61
Q

5 properties improved by combing

A 
luster
strength
hand 
be more even along the length
improve spin limit

TT327 (13 decks)

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