**Carding Section: **

The first condition of spinning is to open the fiber at single-stage and which is possible only by carding. The quality of yarn especially depends on the carding action, so carding is called the heart of spinning. Here calculation plays a vital role. So we need to know about the cotton carding section problems and solutions.

**Cotton Carding Section Problems and Solutions**

**Problems and Solutions of Cotton Carding: **

**1.** Draft constant of a carding m/c is 2194 and if the DCP is 22T, then what will be the draft of the m/c?

**Solution:**

Here,

Draft constant of a carding m/c = 2194

DCP of carding = 22T

Draft of carding m/c =?

We know that,

…………..Draft constant

Draft = ……………………… = 2194/22 = 99.72 (ANS)

………………….DCP

**2.** If the draft of a carding m/c is 110 and DCP is 20T, then what will be the draft constant?

**Solution:**

Here,

Carding m/c draft = 110

Carding m/c DCP = 20T

Draft constant of carding m/c =?

We know that,

Draft constant = Draft X DCP

= 110 X 20

= 2200 (ANS).

**3.** If a carding m/c produces 64 grain/gauge sliver by 19T DCP, then what is the DCP needed to produce 70 grain/gauge wt. sliver?

**Solution:**

Here given,

Present DCP = 19T

Wt. of present sliver = 64 grain/gauge

Wt. of new sliver = 70 grain/gauge

New DCP =?

We know that,

……………………Present DCP X Wt. of new sliver

New DCP = ……………………………………………………

………………………….Wt. of present sliver

= (19 X 70)/ 64

= 20.78

= 21T (ANS)

**4.** Calculate the new sliver hank from the following data –

Present hank = 0.16

Present DCP = 18

New DCP = 24

**Solution:**

Here given,

Present hank = 0.16

Present DCP = 18

New DCP = 24

New sliver hank =?

We know that,

……………………………………………………………Present DCP

New sliver hank = Present sliver hank X ………………………

………………………………………………………………New DCP

= 0.16 X 18/24

= 0.12 (ANS).

**5.** A carding m/c produces 0.17 hank slivers from 13 oz (ounce)/gauge wt. lap by wasting 6%. What will be the mechanical draft of the machine?

Solution:

Here given,

Waste = 6%

Feeded lap wt. = 13 oz /gauge

Carded sliver hank = 0.17

Mechanical draft =?

………………….Lap length (gauge)………1 lb

Lap hank = ………………………….. X ………………….

………………………….840………………..Lap wt. (lb)

……..1…………….1

= ……….. X ……………

…….840………13/16

……….16

= ………………

….840 X 13

= 0.00146

Again,

Actual draft of carding m/c = Carded sliver hank / Lap hank

= 0.17/0.00146

= 116.44

Mechanical draft of carding m/c = Actual draft X (100 –Waste) / 100

= 116.44 X (100 – 6) / 100

= 109.45 (ANS).

**6.** If a carding m/c produces 70 grain/gauge sliver from 14 oz/gauge wt. lap. Then what will be the actual draft of the carding m/c?

Solution:

Here given,

Feed lap wt. = 14 oz/gauge

Wt. of delivered sliver = 70 grain/gauge

Actual draft =?

……………………………Lap wt. in oz

Lap wt. in grain = ……………………. X 7000

…………………………………16

= 14/16 X 7000 *(1 lb = 7000 grain)*

= 6125

Actual draft = Feeded lap wt. / Delivered sliver wt.

= 6125/70

= 87.5 (ANS)

**7.** In a carding m/c, rotation of doffer 15 rpm, doffer circumference is 85 inch, Wt. of produced sliver 65 grain/gauge, and efficiency is 85%. What is the production per day of the carding m/c (in metric ton)?

**Solution:**

Here given,

Rotation of doffer = 15 rpm

Doffer circumference = 85 inch

Wt. of produced sliver = 65 grain/gauge

Eff. Of carding m/c = 85%

Production per day =?

We know,

Production = Doffer circumference X Speed X Eff.%

= 85 X 15 X 85/100 inch/ min

= 85 X 15 X (60 X 24)/36 X 65 X 85/100 grain/ day

*(As, 7000 grain = 1 lb and 2204 lb = 1 metric ton)
*= 85 X 15 X (60 X 24)/36 X 65 X 1/ (7000 X 2204) X 85/100 Metric ton

= 0.183 Metric ton/day (ANS).

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**8.** In a carding m/c rotation speed of calendar roller 80/min, Dia of calender roller is 4”, Produced sliver hank is 0.14, Eff. Of carding m/c is 85%, If the tension draft of the m/c is 1.05 then calculate the production per shift (8 hr) of the carding m/c?

**Solution:**

From the given data,

Rotation speed of calendar roller = 80/min

Dia of calendar roller = 4 inch

Produced sliver hank = 0.14

Eff. Of carding m/c = 85%

Tension draft of carding m/c = 1.05

Production/hr =?

We know that,

Production / shift

= Circumference of calendar roller X (60 X 8) / (36 X 840 X Hank) X Tension draft X Eff.%

= 3.14 X 4 X 80 X (60 X 8)/(36 X 840 X 0.14) X 1.05 X 85/100

= 101.68 lb (ANS).

Author of this Article:Md. Abu SayedFounder of Textile Apex Pabna Textile engineering college, Pabna, Bangladesh Email: [email protected] Cell : +8801745214773