Blending may be defined as a condition in which every fibre characteristic is found in the same proportion as in the original blending within every unit cross section of the yarn .Fibre blending has been practiced since the beginning of the cotton textile industry due to the variation in the physical properties of cotton fibres like scrapple length, fineness, strength & cleanliness.
Blending in Spinning Mill
Objects of blending
To achieve uniform quality of product for a longer duration.
To improve processing performance, increase yarn strength.
To reduce & control cost of production.
To facilitate the cotton for regaining its moisture content lost during baling.
Stages in Blending operation, Blending is carried our three stages:
Metering determination & precise establishment of quantities of the individual components.
Mixing that is bringing together of the metered quantities.
Intermingling distributing the components evenly in the body of fibres.
Types of blending operation
Before the blow room
Within the blow room
By using scatters
At the ribbon-lap m/c or the blending
At the D/F,the sliver-lap m/c the comber
At the card or the OE- spinning m/c
At the Ring Spinning m/c
To achieve homogeneous blend the following techniques were adopted.
Here detailing about some common technique of blending
The blending technique is still used successfully to permit the blending of cotton of contrasting fiber properties to produce a variety of end users. A doubling scutcher is requires, this has a conveyor lattice in feed on which from four to six laps could be laid. The lap sheets from these laps passed doubled through a beater position followed by pair of cages &lap winding device.
Advantage of Lap blending
Procedure very good transverse blends & also a good longitudinal blend.
It is very easy process.
Disadvantages of Lap blending
Blend proportions are limited.
Need for control of lap wt.
Blending by doubling with laps at the card is sometimes used in high production cards. The procedure involves use of a double lap roll attachment whose feed rolls are positively driven by a link chain by the regular lap roll gear.
Advantages of Card Blending
Most intimate blend is obtained.
This method is used to randomly mix two laps differing in color.
Disadvantages of Card Blending
It can’t be obtained from wide range.
Controlled metered blending can’t be carried out.
Only make a previously proceeded blend more intimate.
With D/F blending the card slivers are doubled at the drawing process in a predetermined fashion. The percentage of the blending depends on the number of slivers processed. In processing of cotton this method is not used for blending purposes, but it is the most popular method for blending man-made fiber fiber with cotton.
Advantage of D/F Blending
Suitable for blending two different cotton qualities.
Provide best blend in the longitudinal direction.
Working procedure is not complex.
Disadvantage of D/F Blending
Require additional blending passage.
Stripiness may be produce in the finished product.
Poor transverse blending in the product.
Fiber heterogeneity produced.
Engineer Sheikh Nurja
B.Sc engineer of textile
Merchandiser at buying house
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To answer the question what is ginning? I would say, the process by which the fibers are separated from the seeds is called ginning. It is one of the most important steps of the spinning process. After collecting seed cotton from the field, cotton moves to nearby gins for separation of lint, seed and any other foreign particles. The production of a typical gin is about 12 bale per hour (here 1 bale = 500 pounds). Earlier the ginning process is to be done by manually but right now for higher production, manufacturers use an automated machine with higher productivity. The machine is well known as a cotton ginning machine.
Simply to define ginning we can say that the process is used to get the cleaned cotton by separating or removing the seeds, dust or any other foreign particles. So that better cotton can be offered for the cotton spinning mills.
Objects of Ginning
To make the fiber free from seeds without gin-cut fiber.
To ensure the best quality of cotton and get the fair price of cotton in the market.
To be confident that fiber does not contain excess and unexpected seeds or any other particles.
To make the spinning process easier and effective
Ginning of cotton
Ginning Process of Cotton
At first, the cotton is made to go through dryers to reduce moisture content.
Then the cotton is made to go through cleaning equipment to remove foreign particles or materials.
The cotton is then sent to the air conveyed to gin stands where revolving circular saws pull the lint from the saw teeth by air blasts or by rotating brushes.
The cotton is compressed into 500 pounds weigh contained bales.
Then the bales of cotton are shipped to the textile spinning mill for further processes.
To ensure better quality the overall process is monitored by a quality control team.
Types of Ginning
There are two basic types of Ginning you may find. These are: