Spinning Quality and Spinning Parameters

Type of yarn Count... Yarn FibreEvenness U% / CV% Thin places Thick places Neps/1000 m yarn Classimat faults/100 km yarn Breaking tenacity Fmax/tex Breaking elongation % Hairiness H..

Spinning Quality & Spinning Parameters

Name : MAZADUL HASAN SHESHIR

ID: 2010000400008

Batch: 13th Batch (Session 2009-2013)

Department: Wet Processing Technology

The following terms & definitions are used to describe and explain cotton fiber maturity.

Circularity :

The degree of thickening which is calculated by the cross sectional area of the fiber wall divided by the area of a circle of the same perimeter

Theta :

Average circularity of the matured fibers also described as the degree of thickening

Fineness (mtex) : Average fiber fineness (weight per unit length) in millitex 1000 meters of fibers with a mass of 1 milligram equals 1 millitex

Type of yarn Count

Relation between count and staple length

PC (65%Polyester & 35% cotton) 24S, 26S, 28S, 30S

CVC(60% Polyester & 40% Cotton) 24S, 26S, 28S, 30S

Yarn Fibre

Evenness ( U% / CV% )

Thin places Thick places Neps/1000 m yarn Classimat faults/100 km yarn

Breaking tenacity (Fmax/tex)

Breaking elongation (% ) Hairiness (H)

Relationship between yarn & fibre quality characteristics ( Rotor spun yarn ).

Yarn Fibre

Evenness ( U% / CV% )

Thin places Thick places Neps/1000 m yarn Classimat faults/100 km yarn

Breaking tenacity (Fmax/tex)

Breaking elongation (% ) Hairiness (H)

Raw material / cotton fibre selection :

 Fibre length & its uniformity

 Neps content in card sliver

 Sliver linear density & variation control

 Waste control

Key Control Parameters Of spinning Floor :

Lap forming & Combing :

 Control of lap weight

 Comber speed

 Noil (Comber waste) extraction

 Neps in combed sliver

Drawing :

 Drawing speed

 Sliver uniformity/Regularity control

Simplex Fly Frame/Roving Frame :

 Frequency of process change

Key Control Parameters Of spinning Floor :

5. Parallelization & straightening

6. Nap & dead fiber remove

7. Wt/unit length Sliver

Wastage

8. L-in wastage

9. Flat strip

10. Sliver wastage

11. A/C Dust : Back, Ring & Winding

Function & Wastage of different section

c) Drawing

Function

1. Drafting & Doubling

2. Uniform sliver (wt/unit length)

3. More parallelization & straightening (by reduce hook)

5. Drafting & twisting

6. Roving Build up in bobbin

Wastage:

7. Roving wastage

g) Ring Frame

Function

1. Yarn formation

2. Drafting & twisting

3. Yarn Build up in bobbin

.Yarn strength decrease

.Overall yarn quality deteorates

# Bag handling & storage

.Cone damage

.Count & lot mixing

.Overall yarn quality deteorates

# Control of SECDS

.Missing & wrong stickers

.Missing & wrong lot no

.Paper cone condition

.Oil & hand strain

.Top & bottom stitches

TOPIC : SELECTION OF RAW COTTON WITH RESPECT TO COUNT AND PROCESSING MACHINERY.

Pre-Ginning : Cotton Fibre quality depend on the following points to a large extent

Ginning system & type of ginning:

6 Basic working principle of saw & roller ginning

7 Merits & Demerits of roller ginning

8. Merits & Demerits of saw ginning

Relation between processing machine & trash in the cotton:

Normal range:

For ring yarn processing:

 Selection of no of beating point

 Percentage of seat coat fragment in sliver & cotton

 Draft roller distance

 A/C plant performance

For OE yarn processing:

 Selection of no of beating point

 Trash & dust remaining in sliver

 Draft roller distance

 A/C plant performance

A.Classification of cotton base on 2.5% spun length value.

Count vs raw cotton selection:

COTTON PARCHASE SYSTEM

QULITY MANAGEMENT

Quality Characteristics Of Cotton yarn

CV % (Co Efficient of Variation)

CV % (Co Efficient of Variation)

Degree of Contamination

Imperfection (Thick & Thin places)

FAULTS