International Journal of Engineering Inventions

Objectives of Roving frame section

tải về 1.28 Mb.

Chế độ xem pdf

trang	20/27
Chuyển đổi dữ liệu	30.09.2023
Kích	1.28 Mb.
	#55222

1 ... 16 17 18 19 20 21 22 23 ... 27

Analysis on the Defects in Yarn Manufacturing Process

5.5.2 Function of Roving Frame Section 5.5.2.1 Drafting
5.5.2.2 Twisting
5.5.3 How Much Important for Quality

5.5.1 Objectives of Roving frame section
The main objectives of roving frame are given below:

Drafting the draw frame sliver into roving.

To insert the twist into the roving.

Winding the twisting roving on bobbin.
5.5.2 Function of Roving Frame Section

5.5.2.1 Drafting
In roving frame two drafting frame are used.

In 4 over 4 drafting system, total draft should be 13 and in 3 over 3 drafting system the total draft
should not be more then 11.

3 over 3 drafting system is better in that case when there is good fiber length.
5.5.2.2 Twisting
It is very important factor which produces strength in the roving and twist is inserted with the help of flyer.
When flyer rotates, the twist is produce in the sliver. Twist level depends upon flyer speed and delivery speed.

5.5.2.3 Winding
For winding purpose we used builder motion. Important task of winding are:

Shift the cone belt corresponding to increase in the bobbin diameter.

Reverse the direction of movement of bobbin rail at the upper and lower ends of the lift stroke.
Fig. 16 Diagram of winding process
5.5.3 How Much Important for Quality?
The following are the main point regarding to quality in Roving machine.

From quality point of view the break draft should be around 1.18 to 1.24. But break draft depends upon
the drafting system and total draft.

Buffing should be on time and fter 20 days there should be buffing. If buffing is not done on time then
it will create problem in the yarn such as thick and thin places.

Analysis on the Defects in Yarn Manufacturing Process & its Prevention in Textile Industry

www.ijeijournal.com
Page | 60

Spacer (distance strip) color also affects the quality of yarn. We should change the color according to
roving count.

Bottom and top apron also effect on quality in the form of thick and thin places produce.

Density of roving bobbin should be same as in this case if variation will be there then count C.V will
increases.
Fig. 17 Diagram of roving process

tải về 1.28 Mb.

Chia sẻ với bạn bè của bạn:

1 ... 16 17 18 19 20 21 22 23 ... 27