Package Density in Yarn Dyeing:
Package density has an important effect on yarn dyeing. When packages is too soft then liquor flowing through it will find the course of least resistance and cause channeling, which leaves some parts of the package relatively undyed or lighter. If the packages are wound too hard, a point can be reached where the flow of liquor is impeded to such an extent that poor dying or none may occur. In this article, we will discuss yarn package density in yarn dyeing.
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The ratio of mass and volume is called density.
Density = ρ
Mass = m
Volume = v
Here,
m = (Bobbin weight with yarn – Bobbin weight without yarn) gm.
v = π (R12 – R22) × h
R1 = Outer radius of the bobbin (with yarn).
R2 = Inner radius of the bobbin..
Say, for example,
Outer Radius, R1=16.3/2 = 8.15 cm.
Inner Radius, R2 = 6.96/2 =3.48 cm.
Height = 16 cm..
We know = πr2h.
So, total volume, V1 = π R12h
=3.1416 X (8.15) 2 X 16
=3339 cm3
Steel bobbin, V2= π R22h
= 3.1416 X (3.48)2 X16.
= 609 cm3
Original volume = (3339-609) = 2730 cm3
Package Density, ρ = m/v
= (1395-235)/2730
= 0.42 gm/cm3.
Package density in soft winding for cotton must be 0.36 to 0.40 gm/ cm3 and for polyester or CVC, it would be higher than 0.40 gm/cm3.
Calculation of Package Density in Yarn Dyeing
We measure the package density of different bobbins in this section which are:
| Count (Ne) | Package density (gm/cm3) |
| 20s | 0. 387 |
| 24s | 0. 375 |
| 26s | 0. 382 |
| 28s | 0. 35 |
| 30s | 0. 345 |
| 34s | 0. 37 |
| 40s | 0. 378 |
For filament (Polyester):
| Count (denier) | Package density (gm/cm3) |
| 30 | 0. 44 |
| 75 | 0. 376 |
| 100 | 0. 46 |
For spun yarn:
| Count (denier) | Package density (gm/cm3) |
| 40/2 | 0. 39 |
| 50/2 | 0. 4197 |
For CVC yarn:
| Count (Ne) | Package density (gm/cm3) |
| 30s | 0. 40 |
| 26s | 0. 39 |
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Author of this Article: Rana Sohel Executive Engineer Sunman Textile Mills Ltd. Chittagong Cell: +8801912-420118 Email: [email protected]