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Important Calculation of Carding

Important Calculation of Carding
Abdullah Nur Uddin Rony
Textile Engineering College, Noakhali
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Carding:
Carding is a mechanical process that breaks up, cleans and intermixes fibers to produce a continuous web or sliver suitable for subsequent processing. Carding is one of the most important operations in the spinning process. It is called heart of spinning. In this article I have given various problems and solutions of carding. Before reading this article you should follow the formulas of carding operation.
Carding section
Carding section
Important Calculation of Carding:

Problem-1:
Calculate the cleaning efficiency of carding from following data:

Trash in lap = 6.5 lbs
Trash in sliver = 1.5 lbs

Solution:

                                                     Trash in lap - Trash in sliver
Cleaning efficiency of carding = ………………………………. X 100
                                                              Trash in lap

   6.5 -1.5
= ………. X 100
      6.5

= 76.9%  = 77% (Ans).

Problem-2:
In a carding m/c D.C.P is 20 & draft constant is 2220. Find the draft of the m/c.

Solution:

We know,

                 Draft constant
Draft = …………..…………
             Draft change pinion

    2220
= ………
     20

= 111. (Ans.)

Problem-3:
Find the required D.C.P from the following information-

Present D.C.P = 21T
Present Hank = 14 Reqd Hank = 18.

Solution:

We know,

                                                          Present hank
Required D.C.P = Present D.C.P x …………………
                                                        Required Hank

          0.18
= 58 x ……….
          0.16

= 65 T (ANS)

Problem-4:
Calculate the production/hr in kg of 10 carding m/cs from the following informations –

  • Doffer r.p.m = 45,
  • Doffer dia = 27 inch,
  • Hank of sliver = 0.15s Ne,
  • Waste extraction = 4% &
  • Efficiency = 90%.
Solution:

                          π x 45 x 27 x 60 x 90 x (100 - 4)
Production / hr = …………………………......................….. lb
                             840 x 36 x100 x100 x 0.15

= 43.60 lbs.
= 19.78 kg. [1 kg = 2.204 lbs]

Production/hr of 10 carding m/c = 19.78 x10 = 197.8 kg. (Ans.)

Problem-5:
Feed roller dia = 2.25 inch, Feed roller r.p.m = 4, Doffer dia = 27 inch, Doffer r.p.m = 30, Lap wt = 14 os/yd, Carding eff. = 90%. Find the prodn/hr in lbs.

Solution:

                        1yd x1lb
Lap hank = ..............................
                   840yds x (14/16)

= 1.36 x 10-3

             Surface speed of delivery roller
Draft = ..............................................................
              Surface speed of feed roller

    π x 27 x 30
= …………………
    π x 2.25 x 4

= 90

We know,

             delivery hank
Draft = ………………
               feed hank

Delivery hank = 90 x1.36 x10-3 = 0.1224.

We know,

                                π x D x N x 60 x 90
Production / hr = ………………………......... lb
                              840 x 36 x 0.1224 x100

    3.14 x 27 x 30 x 60 x 90
= ……………………………….. lb
    840 x 36 x 0.1224 x100

= 37.11 lbs.(Ans.)

Problem-6:
The surface speed of the coiler wender rollers calculated & found to be 39.1 m/min. If the linear density of the sliver is 4 kilo Tex (4kg/km). What is the production per hr at 80% efficiency.

Solution:

Production = πDN x Efficiency

              80
= 39.1 x ……… m/min
             100

              80            4
= 39.1 x ……… x ……… x 60 kg/hr
            100         1000

= 7.50kg / hr (Ans.)

Problem-7:
Here, doffer r.p.m = 1, Dia = 27 inch, sliver wt = 1grain/yds. Tension draft = 1. Find the production constant at 85% eff.

Solution:

                                      πDN x 60 x eff .x sliver wt./grain x tension draft
Production constant = ……………………………............................……….
                                                           36 x 100 x 7000

= 0.017 (ANS)

Problem-8:
Calculate the production in card from the following details – Doffer r.p.m = 9.95, sliver wt 50 grains/yd, prodn const. 0.017, tension draft 1.03, efficiency 85%

Solution:

Production = Production constant x doffer r.p.m x T.D x sliver wt. gr/yd

= 0.017 x 9.95 x1.03 x 50
= 8.71 lbs. (Ans.)

Problem-9:
Feed mtl wt. (lap wt) = 14 oz/yd, total draft of m/c = 105, doffer speed = 30, dia = 27 inch, eff. 85%. Calculate prodn in lb/hr.

Solution:

                         1x1
Lap hank = .........................
                   840 x 14/16

Feed hank = 1.36 x10-3

Draft hank = draft x feed hank
= 105 x 1.36 x10-3
= 0.1428

                             3.14 x 30 x 27 x 60 x 85
Production/hr = ………………………..…......
                             840 x 36 x 0.1428 x100

= 30.04 lbs (Ans.)

Problem-10:
Find the total prodn of a carding m/c for 1 hr with following details: doffer r.p.m = 10, dia = 27 inch, sliver hank = 0.15, eff. =90%.

Solution:

                            π x D x N x eff .x 60
Production/hr = ………………..………
                           lbs 36 x 840 x count

   3.14 x 27 x10 x 60 x 90 x 1
= …………………………………
       36 x 840 x100 x 0.15

= 10.098 lbs (Ans.)

Problem-11:
Find the prodn of a carding m/c for 8hrs with the help of following data: c. roller r.p.m = 80, dia = 4 inch, sliver hank =.14, eff. = 85%, tension draft =1.05

Solution:

                      3.14 x 80 x 4 x 0.85 x 60 x 8
Production = ………………………………….
                                        36

= 11393.536 yds/8hrs

Production of Coiler Calender roller = 11393.536 x1.05 yds/8hrs.

= 11963.213 yds/8hrs.

                                                                                  1
Production of carding machine = 11963.213 x ………......…. lb/8hrs
                                                                             3.14 x 840

= 101.72799 lbs/8hrs. (Ans.)

Problem-12:
In a carding m/c it produce sliver wt. of 60 gr/yds when its DCP is 17. To produce sliver wt. of 70 gr/yds then how many teeth of D.C.P should be used?

Solution:

                               Present D.C.P. x Required wt of sliver
Required D.C.P. = ……………………………............……..
                                         Present wt. of sliver

           90
= 17 x ……
           60

= 25.5

= 26 (ANS)

Problem-13:
The present produced sliver hank of a carding m/c is 0.16. Present D.C.P 18T. If reqd DCP is 22T, then calculate the sliver hank (required).

Solution:

                                                                          Present D.C.P.
Required sliver hank = Present sliver hank x ………………….
                                                                         Required D.C.P

             18
= 0.16 x …...
             22

= 0.130 (Ans.) 
 
 

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