Necessity of roving frame 1. The first reason is related to the required draft. Sliver is a thick, untwisted strand that tends to be hairy and to create.

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Presentation transcript:

Necessity of roving frame 1. The first reason is related to the required draft. Sliver is a thick, untwisted strand that tends to be hairy and to create fly. The draft needed to convert this to a yarn is in the region of The drafting arrangements of ring spinning machines, in their current forms, are not capable of processing this strand in a single drafting operation to create a yarn of short-staple fibers that meets all the normal demands on such yarns. The fine, twisted roving is significantly better suited to this purpose.

Necessity of roving frame 2.The second reason is that draw frame cans represent the worst conceivable mode of transport and presentation of feed material to the ring spinning frame.

View of roving frame

Md. Reajul Islam, Lecturer, DIU

View of roving frame Md. Reajul Islam, Lecturer, DIU

View of roving frame Md. Reajul Islam, Lecturer, DIU

Objects/ Functions of speed frame 1.Attenuation of drawn sliver to form roving of required count by drafting. 2.Insert small amount of twist to give required strength of roving. 3.Wind the twisted roving on to the bobbin. 4.Build the roving in bobbin such a form which will facilitate handling, withdrawing & transfer to the next process. Md. Reajul Islam, Lecturer, DIU

Operations involved in simplex machine 1.Creeling 2.Drafting 3.Twisting 4.Winding 5.Building 6.Doffing Md. Reajul Islam, Lecturer, DIU

Creeling To feed the sliver by the help of several rows of driver rollers to the machine Drafting To reduce the wt/unit length of sliver to make it suitable for ring spinning system Md. Reajul Islam, Lecturer, DIU

Twisting To insert small amount of twist to give required strength of roving. Winding To wind the twisted roving on to bobbin. Md. Reajul Islam, Lecturer, DIU

Building To build the roving in bobbin such a form which will facilitate handling, withdrawing & transfer to the next process. Doffing To replace an empty bobbin at the place of full roving bobbin. Md. Reajul Islam, Lecturer, DIU

Manufacturer of speed frame 1. Rieter (Switzerland) Used in recent spinning mill 2. Toyoda (Japan)(FL-16, FL- 100) Used most in our country 3. LMW(India)/Laskmi Md. Reajul Islam, Lecturer, DIU