What are the assumptions of an Ideal Yarn Properties?

The following yarn properties should have a textile yarn if it is said as a ideal yarn-
1. The yarn in circular in cross-section and is uniform along its length.
2. Yarn is composed of concentric layers of different radial.
3. Each fibre follows a uniform helical path around one of the concentric cylinder so that its distance from yarn axis remains constant.
4. A fibre at the centre will follow a straight line of the axis.
5. The axis of circular cylinders coir sides with yarn axis.
6. The number of filaments or fibres crossing the unit area is constant; that is the density of packing. Fibres in the yarn are constant throughout the model.
7. Every filament in the yarn will have the same amount of twist per unit length.
8. The yarn consists of very large number of filaments.

If the above mentioned yarn properties is absent on any yarn than the yarn should not be allowed on weaving to make fabric. Because it will not be able to give you a perfect weaving combination where the warp and weft yarn’s parameter is mandatory to be maintained.

Logic of Twist Contraction & Retraction factor of Textile Yarn

Twist contraction and retraction is very necessary to know for the best service on yarn spinning section. By contraction and retraction factor you will know when the textile yarn is followed a longer path for migration during twisting or how to maintain the draft setting properly.

Twist Contraction or Textile Yarn:

Normally before twisting, yarn  contains textile fibre individually in extended state. By twisting yarn is contracted and mass per unit length increases because when yarns are twisted, the fibres in the yarn have to follow a longer path for migration. For staple fibre yarn, this phenomenon is called contraction. For filament yarn this is called retraction.

Contraction Factor:

Contraction factor indicates the factor by which the draft must be adjusted to prevent the twist contraction from decreasing the size or count of staple spun yarn.
Contraction factor may be expressed as,
CY = Length of Zero Twist Yarn / Length of twisted yarn.

The contraction factor, which ranges from 1 for no contraction to infinity for contraction to zero length.

Retraction Factor of Yarn:

In represents the fractional decrease in length or increase in the linear density or twisting continuous filament yarns.
Retraction factor is expressed as,
RY = Length of zero twisted yarn length/ Length of zero twit yarn.

What is Yarn Count |How to Find Out Direct, Indirect, Tex, Denier Count

Here is the process terms on how to find out a yarn count and the basic things of count:

Yarn Count:

Count is the numerical expression of coarseness or fineness of the yarn.

Types of Yarn Count:

Count is basically two types- 1. Direct Count 2. Indirect Count.

Direct Count:

In direct system length unit is fixed but weight unit is variable. In this system the weight of fixed length of yarn is calculated and expressed by different weiht unit especially gram. In this system yarn will be coarser if the number is increased. Direct system is classified normally into two- 1. Denier 2. Tex.

Denier Yarn Count System:

In this system, the length of yarn is 9000 m. if weight of 9000 m length of yarn is 40 gram the count of that yarn will be 40 denier.

Tex:

In tex system weight of 1000 m length of yarn is considered and expressed by gram. Such as, if weight of 1000m length of yarn is 20 gram, the count of that yarn will be 20 tex.

Lbs/ Spindle:

Weight of 14,400 yds jute yarn is calculated and expressed by lbs. That means, if 14,400 yds jute yarn weight is 8 lbs, the count of that jute yarn will be 8 lbs/ spindle.

Indirect Count:

In indirect system the count is classified into two groups. One is English cotton count system and another is Metric system.

English Cotton Count System:

Here weight unit is fixed but length unit is variable. In this system the number of hank of 840 yds yarn in one lbs is the number of English cotton count. Higher the number of count, finer the yarn. the lower the number of count, the coarser the yarn. It is expressed by (Ne).

Metric System:

In this count system number of hank of 560 yds yarn in one kg is the number of metric count. It is expressed by (Nm).

Blowroom | Blow-room & Blending Importance in Textile Spinning

In this post I will tell you about the very first section of making a Textile Yarn named “Blowroom”. The blowroom is “must needed” type section of a spinning factory where different type of works are done like fibre opening, cleaning and some other further acts which is needed to boost up the yarn quality.

What is Spinning Blowroom:

Definition of Blowroom: Blowroom consists a number of machines used on succession to open and clean the cotton fibre. About 40% to 70% trash is removed in blow-room section.

Objects of Blow-room:

1. Opening:
a) To open the compressed bales of fibres.
b) To make the cotton tuft as small as far as possible.
2. Cleaning:
To remove dirt, dust, broken seeds, broken leaves, and other foreign materials from the fibre.
3. Mixing & Blending:
To make good value of yarn and to decrease production cost mixing and blending is done.
4. Lap or flocks formation:
To transfer opened and cleaned fibre into sheet form of definite width and length which is called lap or in modern system directly feed to the carding machine into flocks form.

Importance of Blowroom in Yarn Spinning:

1. Blowroom is installed to achieve uniform quality.
2. to improve processing performance.
3. to reduce and control production cost.
4. to meet end use requirement
5. to facilitate the cotton for regaining its moisture content lost during boiling.

Besides the factors mentioned above, you may find more features of textile spinning’s blowroom. Wish you good textile spinning journey.

Process Flow Chart of Combed Yarn Manufacturing

Process Flowchart of Combed Yarn Manufacturing:

Combed yarn is more precise than card yarn. Here is the process flowchart of Combed Yarn.

I said it before that the Carded Yarn needs less steps to follow to make a yarn than the Combed yarn. The main purpose of Combed yarn manufacturing is to create a yarn which is highly finer and highly qualified.

Here i will give you a chart from where you will be able to know about How A Yarn is made by the combed yarn manufacturing process”.

Input ———Processing Machineries ———-Output

Raw Cotton>>>>>>>>Blow Room>>>>>>Lap

Lap>>>>>>>>>>>Carding>>>>>>>>>>>>Carded Sliver

Carded Sliver>>>>Pre-Comb Drawing>>>>>Pre-comb drawn sliver

Pre-comb Drawn Sliver>>>>Super Lap Former>>Mini Lap

Mini Lap>>>>>>Comber>>>>>>Combed Sliver

Combed Sliver>>>>>>Post Comb Drawing>>>>>>Post Comb Drawn Sliver

Post Comb Drawn Sliver>>>>>Speed Frame/ Simplex>>>>>Roving

Roving>>>>>>>>>>>Ring Frame>>>>>>>>>Yarn

Yarn>>>>>>>>>>>>>Winding>>>>>>>>>Yarn in large package

The Combed manufacturing process flowchart has been mentioned above is followed by the textile mills.