In cotton spinning, the draw frame slivers from the draw frame are not thin enough to be used on the ring spinning machine. Since it is not possible to draw at high rates in the ring spinning machine, intermediate thinning was required. The roving frame has been designed to meet this need.
Two types of roving frames are used in textile technology.
Finisher roving machine: It is a roving machine used in wool spinning and false twisting is provided by rubbing hoses.
Flayer roving machine: It is a roving machine used in cotton spinning and false twist is provided by butterfly.
The roving process can be defined as the pre-spinning process in which the semi-finished product is thinned and sufficient strength is provided with a very little twist in order to prepare for ring spinning after the draw frame process. Roving process is the last process of yarn spinning preparation.
Duties
1-It is to bring the draw frame to a fineness that can be used in the ring spinning machine by drawing.
2-By giving a small amount of twist, which is also called false twist, it prevents the fibers from dispersing and gains strength.
3- It is to wrap the draw frame band that comes with the buckets on the bobbins in the form that can be used in the ring spinning machine.
The Flayer Roving Frame is studied in four parts:
Feeding Section
It is the rear part of the machine. It consists of band buckets and the creel section where the bands are delivered to the machine. From the buckets at the back of the machine, the tapes are fed to the machine and conveyed to the drafting zone. Before the tapes enter the drafting zone, they pass through the tape guides (clips). Belt runners move left and right, preventing the tape from entering the drafting area from the same point.
Shooting Part
In the roving frame, the drafting part consists of a three-cylinder drafting device. The rollers are in three pairs, one at the bottom and one at the top.
The lower rollers consist of draft rollers made of corrugated metal, and the upper one consists of pressure rollers covered with elastic material. The draft rollers are moved by gears with the movement from the motor. The pressure rollers take action as a result of friction with the drafting rollers. Each drafting roller rotates faster than the previous one. Due to the speed difference, the rollers give traction to the drawbar band, making it thinner and making the fibers more parallel. After that, it enters between the middle drafting roller and the metal roller on it. However, the belt does not come into direct contact with the middle roller and the metal roller itself. They have aprons on them. Aprons are made of synthetic rubber and help the fiber thinned by drawing to enter the pre-drawing cylinder without being damaged and dispersed. The draft that occurs between the rear drafting roller and the middle drafting roller is a preparation. The main draft occurs between the middle and front draft roller. The formation of gravity occurs with the increase of the peripheral velocities from the back to the front.
Twist Part
It is the part where the twist, also called false twist, is given in order to give strength to the thinned fiber strip and to prevent the fibers from dispersing. The twisting process takes place with the rotation of the butterfly at the distance between the last pair of rollers of the drafting device and the throat of the butterfly. After the roving comes out of the drafting cylinders, it gets twisted. As the spindle rotates at a constant and constant speed, the twist on all sides of the roving is the same. The amount of twist in the roving is sufficient to provide the necessary strength in winding the roving into balls and during the discharge of the roving balls from the ring machines. Excessive twist prevents yarn production of desired quality. The tension of the wick in the twisting region is called tension. If the tension is not adjusted well, breaks occur in the roving.
Winding Part
Basically, it takes place between the spindle, butterfly and carriage trio and is the part where winding is performed on the bobbin to be used in the ring spinning machine. The twist wick enters the hollow butterfly wing through the butterfly throat and exits at the lower end.
It is wrapped around the presser finger several times and passed through an eye and given to the roving bobbin. During the operation of the machine, the butterfly speed is constant, the bobbin speed is variable and faster than the butterfly. In order for the winding to take place, the coil revolution must be in a decreasing value ranging from the smallest diameter to the largest diameter, and the peripheral speed must be higher than the peripheral speed of the butterfly. This variable speed of the coil is realized by conical pulleys. The wick, coming from the butterfly and passing through the presser finger, is wound on the bobbin in layers. Together with the spindles and bobbin mounted on the trolley assembly, it moves up and down to realize the conical winding.
Roving in cotton spinning is also called flayer.
The Purpose of Making a Flayer
Since it is not possible to feed the yarn machine as a band from the draw frame (except for the OE spinning system), the bands need to be thinned a little more. The flayer machine is used for the machines that pull the bands into a form that can be processed on the spinning machine. roving tape It called.
What are impacted teeth?
When one or more teeth fails to grow in the correct position and is therefore held below the normal gum line, it is called an impaction. This can be complete, such as completely unerrupted (buried) third molars (wisdom teeth) or partial when just part of the tooth is visible in the mouth.
Why are impactions important?
For best function and appearance the teeth should grow in a healthy alignment. When one or more teeth is impacted, this can affect the function of that tooth but also the function and appearance of other teeth.
Whether all impactions should be treated is still controversial and your dentist and oral and maxillofacial team can explain the advantages and disadvantages or treatment for you, which is usually surgical.
TASKS OF FINISHOR ROVING MACHINE AND FLAYER ROVING MACHINE
1-It is to bring the draw frame to a fineness that can be used in the ring spinning machine by drawing.
2-By giving a small amount of twist, which is also called false twist, it prevents the fibers from dispersing and gains strength.
3- It is to wrap the draw frame band that comes with the buckets on the bobbins in the form that can be used in the ring spinning machine.
Working Principle
In the roving frame, there is a feeding part to be able to feed, a drafting device to make thinning, a twisting device to be able to twist, a winding device to make it into a bobbin and give a conical shape. The draw frames from the draw frames are placed in the feed part of the roving frame. The strips taken from the buckets are passed through the guides and given to the drafting part of the machine. Here, the strips are thinned by pulling at the specified rate. brought to the desired fineness. strength by butterfly bending to the roving strip it pays off. Twisting takes place with the rotation of the spindle at the distance between the last pair of rollers of the drafting device and the spindle (butterfly). The roving obtained as a result of these processes is wound on the roving pen in a conical manner with the car assembly.
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