metallic wire for high-speed and high-production...
TRANSCRIPT
滋 賀 大 学 教 育 学 部 紀 要 自然 科 学 ・教 育 科 学
No.40 p.p.61-66, 1990
61
Metallic Wire for High-Speed and High-Production Cotton Card
Part 4:Testing in taker-in part
Jyuzo HOSOKAWA
Abstract
In high-speed and high-production carding, the yield rate of sliver is generally
lowered as the speed of taker-in roller is increased.
To find out the countermeasures against the controversial point mentioned
above, carding tests were carried ou亡by lowering the taker-in speed and by using
the toothed mote knife in place of the conventional one(without tooth).
This report is related to the results of these tests.
Results
(1) The number of neps in the silver in case of standard taker-in speed was
less than that in case of the low taker-in speed.
(2) At the standard speed of taker-in there was no difference in the yield rate
of taker-in wastes between the toothed mote knife and the conventional one. The
yield rate of flat strip was higher with the toothed mote knife than that with the
conventional one regardless of the taker-in speed.
(3) The results of Shirley Analysis of taker-in waste show that the lint con-
tents in the wasts are the lowest at the low speed of taker-in with the toothed
mote knife.
(4) The mean fibre length of sliver is kept unchanged with the toothed mote
knife or the conventional one. Contrarily, the taker-in speed has the significant
influences on the mean fibre length.
1. Introduction
The results of high-speed and high-pro・
duction carding tests have created two problems
on the taker-in part.
One is the fibre breakage on the taker-in part
and the other is the decrease in yield rate of
sliver according to the increase in taker-in
waste.
The increase in taker-in speed and the quick
opening on the taker-in part are considered to
have the adverse effect on those problems.
Many of the card manufacturers keep an eye
recently on the preliminary carding devices
around the taker-in part to improve the carding
and cleaning efficiencies in high-speed and
high-production carding.
This report concerns with the results of card・
一ing tests practiced by lowering the taker-in
speed and by using the toothed mote knife to re・
solve problems mentioned above・
62 』.Hosokawa
The standard speed of taker-in is 1,715 rpm2. Test condition
and the low tip(・ed is l,260 rp匿1夏When the cvlin-
2.1 Toothed mote knife used for this test (lcr spccd is 650 rpm.
1'll〔}to.1 shows the app(.・arang・of to('}thed The effect of t.he t()othed n亘ote knife was(,x-
mote knife. amined in both cases of the standard speed and
Four rows of blades arc buried into)the mote the low speed of taker-i!'1,
knife as shows'l ill Phot〔.).1. 2.3 Main settings
Settings of eath part of the card are shown in
fig.1,
"'「hell a convelltional motu k[iilc is mounts(.1,
the setting bet、vccn the conventionと 亀I mote knife
and thr taker-in is ado)t.e(.I at 12/1,000 inch as
illustrateしl in il、ig. 1.
「Fhe setting bctw・ccn the toothed m〔)tc knife
and the taker-il・1 is ad(.)ptcd at 12/1,000 inch at
the inlet part of the t(:)othed mote knife and at
32/1.,000inch al/h(}outlet part of it.
3. Testing results
The changes in the qua】ity of sliver given
Photo. 1 undcr Uic a[.)ove conditionsと.u-c as follows.
3.1 Number of neps
The changes in the number of neps in the
2.2 Carding conditions slivcr('〕f l gram arc sho～ ～'n in Fig,3.
Carding conditions for this test are shown in The numbers of neps in Fig.3arc the total
t乏11)1〔, 1_ ・ i1し】ml)e1■ ()「 1〕しil)ti 111(!1し1〔ling 1乏11'髄9C, 1'1】C〔liしII'11 三i11(l
The carding test was carried out by tw〔 〕 small.
different taker-in speeds;i.e. the standard and As Fig.2illdicates. the numbers o「1'lops arc
the low speed. re[narkab【v Icss at t.he st三mdar〔I spccd of takcr-
The surface speed ratios of the cylinder in than those at the low speed.
speed to the taker-in speed were set at 2:1for This is prol)able becausc the carding a(lt.ion
the standard speed of taker-in and 2.6 : 1 (or ()n the t.aker-ii〕part is I()wcred as the result of
the low speed・ the reduction〔')t th〔・t.aker-in spe(ld .
Table l Carding conditions
Speed (rpm)
Surface speed (n・1/s>
T〔〕P
speed
(mm/min)
ProducLi('川
rate
(lbs/hr)Cylinder Doffer taker-in
Standard
low speed
Sliver
Weight
(grains
/6v(1) 馳
300
(20.3)
18
(0.66)
792
q〔.),2)
584
(7.5)104 590 6(.)
450
(30.4)
27
(0.98)
1,187
(15.2)
88(')
(11.3)156 590 90
650
(43,9)
39
(1.42)
1,715
〔22.0)
1260 ,
〔16.2)226 590 130
Metallic Wire for High-Speed and High-Production Cotton Card 63
●
15
●15
● 38
● 15
26
謝
38
●
謙ぐン:◎㊥㊥ μ8・ ㊥
Fig.1 Main Setting
12/1000俘
Toothed
mote knife
Taker-1R
32/1000潮
Fig.2 Settings between the toothed mote knife and
the taker・in rol且er
In both cases of the standard speed and low
speed of taker-in, no difference in the number
of neps between the toothed mote knife and the
conventional one was recognized in this test.
It can be, therefore, regared that the ap-
pliance of toothed mote knife does not affect the
number of neps in the sliver.
3。2 Yield rate of carding products
Fig.4shows the changes in the yield rate of
carding products.
十:Standard, with toothed mote knife
一一〇 一一:Standard, with conventional mote knife
一 ▲ 一:Low speed, with toothed mote knife
一一△ 一一:Low speed, with conventional m。to knife
(Sliver weight:590 grains/6yd)
(・。＼の。α)
巴
。ε
o」①ρ目目
角
↑
600
500
400
300
200
0
、 、 、 、
、 、
、
一 一 一 一
、、
、r辱 、、 、
、、
㌔」、 、、
Cylinder(rpm)
(m/s)
Doffer(rpm)
Production rate(lbs/hr)
300 450 650
20 30 44
18 27 39
60 90
Fig.3 The number of neps in sliver
130
As shown in Fig.4, the yield rate of taker-in
waste was evidently less with the toothed mote
knife than that with the conventional mote knife
at the standard speed of the taker-in. ,
64 」,Hosokawa
一 ● 一:Standard, with toothed mote knife
一一〇 一一:Standard, with conventional mote knife
一 ▲ 一:Low speed, with toothed mote knife
一一△ 一一:Low speed, with conventional mote knife
(Sliver weight:590 grains/6yd)
(承)
の」①εO
(承
)
」①≧
一の
でOり5唱O」山
(承
)
①拐
。6≧
口唱1」①起邸』ギ
5
0
100
95
90
5
藷 …邑邑≡
脳
o軸 軸 一一
十:Standard, with toothed mote knife
一一〇 一一:Standard, with conventional mote knife I
一 ▲ 一:Low speed, with toothed mote knife
一一△ 一一:Low speed, with conventional mote knife
(Sliver weight:590 grains/6yd)
ち8}
1難100一 一 一 主驚 量 一ρψρ
一一 一
鴨鴨 馳馳亀
0
一一 一一.
一 一■一一〇ロー一
60
( 50
.言δ 40日 30
20
農5 の O
Cylinder(rpm)
(m/s)
Doffer(rpm)
Production rate(lbs/hr)
一 〇一 一 一 一一一一
(承
)
でΦ噛①ρ
〇一α邸一
}O
Φ日コ【O>
O`一
〇一の一口①一口OO4の邸」一
も
の①b。S
5
。」Φ店
300 450 650
(承
)
名
。5」↑
20 30 44
18 27 39
130
10
0
0
0
0
0
0
0
0
0
7
戸0
にり
4
3
2
1
,ρ'
,'"
一go一
個 驕鴨一〇
一 一'
心 '
4 ノ
●c幽△…邑…琶 ●つ」△
、 陶鴨も た 、
、 、 、、 、、
、o__ 隔 馳
隔、
'一 一〇
Cylinder(rpm)
(m/s)
Doffer (rpm)
Production rate(1bs/hr)
300 450 650
60 9020 30 44
Fig.4 Yield rate of carding products18 27 39
At the low speed of take卜in, there is no dif-
ference in the yield rate of taker-in waste be-
tween the toothed mote knife and the conven-
tional one.
It is supposed that the use of toothed mote
knife on the taker-in part causes the facts of
making the fibre tufts finer and of preventing
the large fibre tufts from dropping so that the
yield rate of taker-in waste could be reduced.
In view of the taker-in speed, the yield rate
of taker-in waste was reduced at the low speed.
Therefore, the reduction of taker-in speed is
effective for reducing the taker-in waste.
The yield rate of flat strips is increased when
the toothed mote knife is mounted in both cases
of the standard speed and the low speed of the
taker-in, but its increasing rate is higher at the
60 90
Fig.5 Shirley Analysis of taker-in waste
130
low speed.
This is probably because the volume of fibre
fed into the section between the cylinder and
the top is increased by reducing the volume of
taker-in waste.
The yield rate of silver was lowest when the
conventional mote knife was used。
3.3 Shirley Analysis of carding wastes
(i) Shirley Analysis of taker-in waste
The result of Shirley Analysis of the taker-in
waste is shown in Fig.5.
As indicated in Fig。5, the percentages of lint
contents in the taker-in waste are reduced re-
markably by using the toothed.mote kn董fe and
Metallic Wire for High-Speed and High-Production Cotton Card 65
also at the low speeed of taker-in .
With using the toothed mote knife, the rate of
reduction is higher at the standard speed than
that at the low speed of taker-in .
The low speed of taker-in or the use of tooth-
ed mote knife is effective for reducing the per・
centages of lint contents in the taker-in waste .'
The percentages of trash contents show the
same tendency as those of lint contents .
(丘i> Shirley Analysis of flat strip
The result of Shirley Analysis of flat strip is
shown in Fig.6.
一 ● 一一:Standard, with toothed mote knife
一一〇 一一:Standard, with conventional mote knife
一 ▲ 一:Low speed, with toothed mote knife
一一△ 一一:Low speed, with conventional mote knife
(Sliver weight:590 grains/6yd)
(承)
寂
①ρ。言
謡
も
①日三〇>oε
ε
沼5
芒8
省=
も
のΦb。鯉毎ヒ&
10
●C魑 罵 ●Q竺 ミ器 ….●O竺
As the resu置is indicate, the percentages,of置{nt
contents in the flat strips are less and the per・
centages of trash contents are more when the
toothed mote kロife is used in both cases of the
standard speed and the low speed of taker-in.
This is probably because the tufts are made
finer by using the toothed mote knife and be-
cause the cleaning efficiency between the cylin・
der and the tops is improved.
4.Mean fibre lengths of the sliver
The changes in mean fibre length of the sliver
are shown in Fig.7.
0
90
08(求)
召
刷目
70
10
0
(承)
§
①ρ9
量
も
①目玉〇〉
①ヨ
9
ヨ
5
省
8
調の邸お
も
のΦb。ε
鵠
9」①q
豊島瓢ロ ロ 一 口
●[一 ●P,9
一 ● 一:Standard, with toothed mote knife
一.○ 一:Standard, with conventional mote knife
一 ▲ 一:Low speed, with toothed mote knife
一△ 一一:Low speed, with conventional mote knife
(Sliver weight:590 grains/6yd)
30
02
01
(承)
務田↑
O
Cylinder(rpm)
(m/s)
Doffer(rpm)
Production rate (正bs/hr)
24.
鳥 露 23
…δ冒 £ 22 ね
爲
竃 21・
O
Cylinder (rpm)
(m/s)
Doffer (rpm)
Production rate.(1bs/hr)
一
喝覧
、 、、 ●
300 450 650
20 30 44
18 27 39
●C曙 ●Q血△o一 一 一●
胃 一 一 〇 ・
一 一〇二D 一 一●■一一 鳴竜鴨 鴨鴨
悩 60 90 130
Fig.7 Mean fibre length of sliver(with Fibrograph)
300 450 650
20 30 44
18 27 39
60 90
Fig.6 Shirley Analysis of flat strip
130
Up to the range of cylinder speed of 450 rpm,
the mean fibre length of sliver was kept un.
changed regardless of the taker-in speed and
the type of mote knife.
At the cylinder speed of 650 rpm, the fibre
length was longer and the fibre breakage was
less at the low speed of taker-in.
Consequently, the use of toothed mote knife
does not affect the fibre length but the taker-in
、speed has a strong influence on the mean fibre
length.
66 」.Hosokawa
5.Conclusion
From the results of the test on taker-in part,
the use of toothed mote knife does not affect the
number of neps and the fibre length but im-
proves the yield rate of sliver.
The reduction of taker-in speed improves the
fibre length of sliver and the yield rate of card・
ing products but lowers carding efficiency.
To solve these problems, therefore, it will be
necessary to皿ount the stationary flat to the
taker-in side.
!