Merits & limitations of cotton fibre length measuring instruments

Merits & limitations of cotton fibre length measuring instruments

Considerable divergence is found between the opinions about the level of agreement between the results of different length measuring instruments including Baer sorter, HVI fibrograph and AFIS,

Considerable divergence is found between the opinions about the level of agreement between the results of different length measuring instruments including Baer sorter, HVI fibrograph and AFIS, discloses N Balasubramanian.

Fibre length is one of the most important quality of cotton contributing to higher yarn strength spinnability and reduced end breakages in spinning. Short fibre content has pronounced effect on waste, yarn irregularity, appearance and end breakages Conventional and HVI instruments used for testing fibre length parameters of cottons are briefly reviewed here. Merits and limitations of these instruments, precautions to be taken and the agreement between the results of these instruments are discussed based on research conducted over the years.

  • Oil plate method: Fibre straightened by liquid paraffin on a glass plate is measured for length by a scale. Merits – Accurate measurement Limitation – Laborious and time consuming.
  • Balls sorter: Determines frequency length distribution of fibres from which mean, CVs are estimated. Fibres are laid as per their length on a plush table by a moving carriage and fibres falling in different length groups are weighed to give weight length distribution (f(l)). Time consuming and is not commonly used.
  • Baer sorter: The fibres are fractionated into different length groups by a set of parallel combs and top comb and uniform array of fibres is prepared in descending order of length to get cumulative fibre length distribution . Effective length, mean length, upper quarter length and % short fibres are determined. Suter web sorter is a similar American instrument where tufts are weighed instead of being laid on a plush board to prepare a diagram. ASTM Standard D 1447-07, details the Standard Test Method for length and length distribution of cotton fibers (Array Method). Cumulative frequency by Baer sorter is q(l) and is related to frequency f(l) of fibres by (balls sorter)

Merits: 1.Effective length is close to Graders staple length 2. Provides accurate estimate of short fibre content

Limitations. 1. Time consuming (about 2 hrs per sample) 2. Requires considerable operator skill.

  • Shirley Photo Electric Stapler: Light is made to fall on a moving tuft of fibres aligned at one end and the reflected light is made to fall on two photo cells. Distance between two maximum gradient points in the current generated in the two photo cells, as the tuft moved on a traversing tape gives staple length.
  • Peyer Almeter: Fibroliner prepares a beard of aligned fibres held in the needle field of a transfer equipment. The clamped beard is passed between two capacitance plates and the change in capacitance is measured. Both cumulative and histogram of length frequency curve are shown in a printer. Time taken for measurement of length is about 15- 20 min. ASTM D5332- 92 stipulates test method of measuring length by Almeter. Limitation – Finite gauge of Fibroliner does not allow full gripping of short fibres. Fibroliner allows short fibres to move to the centre of beard instead of staying at the aligned end.
  • Fibrograph: Beard of fibres is prepared by picking the fibres randomly from the sample by a comb and loose fibres brushed aside. The beard is optically scanned from the base to tip from which a fibrogram is drawn. The comb has 28 needles/inch. Since long fibres have a proportionally higher probability to be caught by comb this results in a length biased sample. The instrument based on this principle was developed by Hertel. Upper half mean length, mean length and Uniformity index are determined from the fibrogram by drawing tangents to the curve.

ASTM D1447 – 07(2012)e1 gives the Standard Test Method for Length and Length Uniformity of Cotton Fibers by instruments like Fibrograph. Mechanisation of measurement of length in the instrument resulted in servo fibrogr

CATEGORIES
TAGS
Share This

COMMENTS

Wordpress (62)
  • comment-avatar

    best nighttime medicine for allergies exact allergy pills non drowsy allergy medication canada

  • comment-avatar
  • comment-avatar
  • comment-avatar

    what are some nausea medications buy glimepiride 4mg generic

  • comment-avatar

    acne pills prescribed by dermatologist oral deltasone prescription oral medication for acne

  • comment-avatar

    allergy pills non drowsy buy ketotifen 1mg does allegra require a prescription

  • comment-avatar

    order generic isotretinoin 10mg accutane ca order accutane 10mg pill

  • comment-avatar

    order amoxicillin 1000mg for sale buy amoxicillin generic cheap amoxil online

  • comment-avatar
  • comment-avatar

    buy azithromycin 250mg online order azithromycin sale buy generic azithromycin online

  • comment-avatar

    oral omnacortil 40mg cheap prednisolone generic buy generic omnacortil 10mg

  • comment-avatar

    buy amoxicillin 1000mg for sale order amoxicillin generic amoxil price

  • comment-avatar
  • comment-avatar

    generic ventolin 4mg buy albuterol pills oral albuterol 2mg

  • comment-avatar

    buy augmentin 625mg online cheap amoxiclav cost

  • comment-avatar
  • comment-avatar

    buy generic clomiphene buy generic clomiphene over the counter clomid 50mg us

  • comment-avatar

    buy tizanidine sale buy zanaflex generic purchase tizanidine pills

  • comment-avatar

    generic rybelsus 14mg cost semaglutide 14 mg semaglutide usa

  • comment-avatar

    buy deltasone 10mg sale deltasone 5mg for sale buy prednisone 5mg pill

  • comment-avatar

    purchase rybelsus for sale rybelsus 14 mg oral oral semaglutide

  • comment-avatar

    brand albuterol 2mg albuterol 4mg over the counter buy ventolin tablets

  • comment-avatar

    zithromax 250mg uk buy azithromycin without prescription buy azithromycin 500mg for sale

  • comment-avatar

    order amoxiclav without prescription buy amoxiclav online cheap buy augmentin 375mg without prescription

  • comment-avatar

    buy prednisolone no prescription omnacortil medication omnacortil for sale

  • comment-avatar

    buy levothyroxine online buy levothroid pill buy synthroid 75mcg online cheap

  • comment-avatar

    cheap clomid 50mg clomid 100mg price clomid buy online

  • comment-avatar

    viagra tablets buy sildenafil online order viagra 50mg sale

  • comment-avatar

    brand semaglutide semaglutide drug semaglutide online order

  • comment-avatar

    lyrica 150mg ca purchase lyrica online cheap order generic lyrica 150mg

  • comment-avatar

    buy aristocort pills aristocort where to buy aristocort 10mg for sale

  • comment-avatar

    buy desloratadine paypal order desloratadine 5mg pill clarinex 5mg pills

  • comment-avatar

    cenforce 50mg cost cenforce cheap brand cenforce 100mg

  • comment-avatar

    purchase loratadine generic generic loratadine 10mg loratadine 10mg sale

  • comment-avatar

    buy generic chloroquine online chloroquine 250mg tablet buy chloroquine 250mg generic

  • comment-avatar

    orlistat uk xenical us buy diltiazem without a prescription

  • comment-avatar

    buy acyclovir 800mg for sale zovirax 800mg for sale generic zyloprim 100mg

  • comment-avatar

    order norvasc 5mg pill buy amlodipine 5mg without prescription buy norvasc 10mg without prescription

  • comment-avatar

    rosuvastatin 20mg sale cost ezetimibe ezetimibe 10mg us

  • comment-avatar

    order lisinopril 2.5mg sale lisinopril over the counter buy generic lisinopril

  • comment-avatar

    buy generic motilium online tetracycline 500mg sale generic sumycin 500mg

  • comment-avatar

    order metoprolol 50mg generic order lopressor 100mg generic buy metoprolol 100mg online cheap

  • comment-avatar

    ketorolac drug buy toradol cheap colchicine 0.5mg generic

  • comment-avatar

    tenormin pills tenormin cost order atenolol

  • comment-avatar

    methylprednisolone 8 mg without prescription buy depo-medrol without prescription buy generic medrol over the counter

  • comment-avatar

    buy generic propranolol for sale order inderal 20mg online cheap how to get plavix without a prescription

  • comment-avatar

    order methotrexate 10mg order medex pill buy medex for sale

  • comment-avatar

    order reglan generic hyzaar pills order losartan without prescription

  • comment-avatar

    order nexium 40mg for sale buy generic esomeprazole online generic topamax 200mg

  • comment-avatar

    order tamsulosin 0.4mg pills order celebrex 200mg without prescription celecoxib 200mg oral

  • comment-avatar

    order ondansetron 8mg generic cost aldactone buy cheap aldactone

  • comment-avatar

    order avodart ranitidine 150mg uk buy zantac 300mg generic

  • comment-avatar

    finasteride 1mg us proscar online order fluconazole 100mg brand

  • comment-avatar

    buy acillin pills for sale buy penicillin pill how to get amoxil without a prescription

  • comment-avatar

    cipro price – how to buy trimethoprim buy clavulanate generic

  • comment-avatar

    cost valacyclovir 1000mg – buy nemasole medication zovirax 400mg ca

  • comment-avatar

    ivermectina online – amoxiclav online order tetracycline 250mg cheap

  • comment-avatar

    buy ampicillin tablets order buy amoxil online

  • comment-avatar

    buy lasix generic diuretic – candesartan price order captopril 25mg online cheap

  • comment-avatar

    metformin 1000mg tablet – cipro generic buy lincomycin 500 mg generic

  • comment-avatar

    clozaril 100mg sale – order perindopril 4mg online cheap purchase famotidine sale

  • comment-avatar

    order quetiapine 100mg generic – generic effexor 150mg buy eskalith generic

  • Disqus (0 )