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TT327 > Test 2 > Flashcards

Test 2 Flashcards

1
Q

Draft increase, Cv

A

increases

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2
Q

Tex in increases, CV

A

decreases

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3
Q

doubling increases, CV

A

decreases

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4
Q

Parallelism increases, CV

A

decreases

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5
Q

As fiber length increases, CV

A

increases

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6
Q

Doubling CV equation

A

cv in / sqrt(number of doublings)

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7
Q

Actual draft: direct

A

sum of n in/ n out

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8
Q

Actual draft: indirect

A

Count out/ count in

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9
Q

Mechanical draft

A

Vout/Vin

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10
Q

Roll Velocity

A

UpiD

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11
Q

CV2 out=

A

cv2in+cv2added

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12
Q

Draft zones

A

D(n-i + 1) + (i-1) / D(n-i)+ i

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13
Q

Productivity

A

P=Nvn

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14
Q

Actual vs mechancial

A

AD=MD(1-%fiber loss)

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15
Q

drafting

A

reduce material size

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16
Q

drawing

A

the process that preforms the drafting operation

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17
Q

doubling

A

feeding of several input materiala

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18
Q

what is the purpose of doubling?

A

to improve blending and minimize irregularities

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19
Q

4 objectives of drawing

A

reduce input linear density, improve fiber alignment, improve regularity, blending

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20
Q

how many slivers are inputed befoer drafting?

A

6 or 8

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21
Q

which roll is the fastest

A

front roll

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22
Q

what is the ratch

A

distance between nips of rollers

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23
Q

4 perimeters for perfect drafting?

A
  1. fibers are same length and this equals ratch
  2. ratch is constant
  3. roller speeds are constant
  4. fiber speed equals roller speed
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24
Q

4 possible sources of drafting irregularities

A
  1. drafting waves
  2. roller nip movement
  3. roller speed variation
  4. roller slip
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25
Q

cv is ?

A

amount of irregularity

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26
Q

3 drafting wave controls

A
  1. pressure bar
  2. more rollers
  3. Apron drafting
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27
Q

how to avoid roller nip movement?2

A

take weights off when not using and use round rolls

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28
Q

what is roller speed variation associated with 2

A

eccentric bottom roller and gears

roller vibration

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29
Q

fiber slips in rollers depend on what

A

weight on top of rollers, too light fibers wont have contact and too much fibers wont move

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30
Q

what is the problem with bigger roller sizes?

A

have limitation on minimum ratch setting

31
Q

what is the problem with smaller roller sizes?2

A

easy to form laps

wear out easier from having to go faster

32
Q

why is it better to not link draw frames?

A

better to mix outputs from different draw frames to give more consistent quality and minimize variations

33
Q

what is used in long staple drawing?

A

gill-box or pin drafter

34
Q

what hooks do u want for semi worsted?

A

trailing hooks

35
Q

how many drawing processes for semi worsted

A

3

36
Q

when does drawing take place for worsted

A

prior and after combing

37
Q

Worsted drawing are based on what kind of drafting

A

single zone

38
Q

what does a gillbox (pin drafter) use

A

faller bars

39
Q

what speed do faller bars move at

A

back roller speed

40
Q

what is an intersector gill box

A

two row of faller bars

41
Q

what is a gill box

A

single row of faller bars

42
Q

what is a circular chain driven pin drafter

A

it changed the regular rectangular motion route of gill box to circular route and driven by chain

43
Q

what is the purpose of circular chain driven pin drafter 2

A

to enhance the process speed and less machine noise

44
Q

purpose of combing fibers (4)

A

want to remove short fibers
orient the fibers
straight
want to remove neps/ trash

45
Q

what are the 3 parts of combing

A

preparation
combing
finishing

46
Q

what kind of hooks are needed for cotton combing?

A

leading hooks

47
Q

cotton combing needs even or odd number of processes to get a leading hook?

A

even

48
Q

what are the two routes for cotton combing preparation?

A

route 1: sliver lap and ribbon lap

Route 2: drawframe and lap former

49
Q

which of the cotton prep routes are slower?

A

route 1

50
Q

which route of cotton prep is used for lower grades of cotton

A

route 2

51
Q

what is spin limit

A

finest yarn you can make with that particular fiber

52
Q

what is the detachment setting?

A

distance between the nipper and the detaching roll

53
Q

what is a top comb setting?

A

distance between the top comb and the detaching roll

54
Q

increase top setting, amount of waste is

A

decreased

55
Q

increase detachment setting, amount of waste is

A

increased

56
Q

what is the beard

A

the portion of sliver being combed

57
Q

2 big problems in combing

A

short fibers in combed sliver and long fibers in waste

58
Q

how do we get short fibers in our combed sliver?

A

from leading hooks being broken by the comb cylinder when not captured by the top comb

59
Q

how do we end up with long fibers in waste?

A

from trailing hooked fibers in the lap and they aren’t efficiently straightened by the comb and it appears as a short fiber or slippage at the nipper

60
Q

what is the big difference between cotton comb prep and worsted comb prep

A

uses 3 drafting operations between the card and comb.

61
Q

3 differences between cotton comb prep and worsted comb prep

A

fed w slivers rather than a lap
detaching section moves rather than feed section
only one combing station per machine

62
Q

how many processes are needed before a worsted comb to fix the hooks?

A

odd number

63
Q

what kind of hooks are best for a worsted comb?

A

trailing hooks

64
Q

when is top finishing used

A

if combed sliver is the final product

65
Q

what is top finishing?

A

twice drawing

66
Q

what does top finishing due 2

A

improves uniformity, and produces a format that is easily transportable

67
Q

draft should always be

A

greater than 1

68
Q

bigger draft means

A

finer fiber

69
Q

spectrogram shows

A

machine error

70
Q

what is apron drawing

A

it is put in between the front and middle rolls and goes at back speed to help control fiber speed

71
Q

what is a noil

A

short fiber brushed out in combing

72
Q

what units should productivity be in?

A

lbs/hr

73
Q

what units shiuld v be in

A

inch/min

TT327 (13 decks)

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