© 2010 linear density Ō the thickness or diameter of a yarn is one of its most fundamental...

Linear Density

Ō The thickness or diameter of a yarn is

one of its most fundamental properties

Ō However, it is not possible to measure

the diameter of a yarn in any meaningful

way


Linear Density

Ō This is because the diameter of a yarn

changes quite markedly as it is compressed

Ō Because of these problems a system of

denoting the fineness of a yarn by

weighing a known length of it has evolved


Linear Density

ŌThis quantity is known as the linear

density and it can be measured with a high

degree of accuracy if a sufficient length of

yarn is used


Count Determination

Ō Irrespective of the system of yarn

numbering employed, two basic

requirements for the determination of yarn

number are..


Count Determination

ő An accurate value for the sample

length

ő An accurate value

for its weight


Count Determination

Ō The methods determination of yarn

count depend to a large extent on the form

in which the yarn is available for testing


Count Determination

Ō For example

ő when yarn is in form of ring bobbin a

long sample length is possible

ő when yarn is in form of fabric, only a

number of short lengths are available


Weight Measurement

Ō Balances

ő The analytical balances and any other

balances used in determination of count

must be accurate and calibrated time to

time in order to get the exact readings


Weight Measurement

Ō Moisture

ő Moisture contain can affect the results

largely so it is very important to do 24

hrs conditioning of the sample in

standard atmospheric condition


Beesley Balance

Ō A number of special yarn balances are

available which are designed to furnish the

a quick estimate of the count, especially

when only small samples are at hand

Ō One of such balance is BEESLEY Balance


Beesley Balance


Beesley Balance

Ō The Beesley Balance consists of a

lightweight beam pivoted on jewel

bearings with a hook at one end and a

pointer at the other


Beesley Balance

Ō The beam is initially levelled to bring the

pointer against a datum line

Ō A standard weight is suspended in a

notch on the beam arm on the pointer

side.


Beesley Balance

Ō A template is used to cut short lengths of

yarn, the length depending upon the count

system required

Ō These lengths are placed on the hook until

the pointer comes against the datum line


Beesley Balance

Ō The number of short lengths required to

balance the beam gives the count of the

yarn


Beesley Balance

Ō A template is provided to give lengths of

yarn in Metric, Cotton, Linen, Wool Skein, and

worsted counts

Ō The balance is housed in a sheet metal case

having sliding transparent antistatic glass

doors


© 2010 linear density Ō the thickness or diameter of a yarn is one of its most fundamental...

Documents

com13 slide

com14 slide

com10 slide

com4 slide

com19 slide

com3 slide

com9 slide

com16 slide