Structure and working of simplex frame ( Roving frame ) l Building motion l False draft

Creel:
Creel is a very important system of a simplex machine. The slivers are fed to the machine through a positive mechanism called creel. A creel of simplex consists of many rollers driven positively. These rollers carry forward the sliver into the drafting system.
Sliver support system:
When drafting force acts on the sliver, the chances of variation in the material increase. Therefore the sliver necessitates extra support during drafting action in the simplex machine. This extra support helps to maintain the uniformity of material and improves the evenness of roving to be produced. Since in the drafting region, the number of fibres is less and they are passed through the drafting system so that any floating fibre content occurs fabric defects and it has to be avoided. These two aprons are used to provide support to the material during drafting action.
type of drafting arrangements:
In 4 over 4 drafting arrangements, the maximum total draft can be employed up to 13. The thickness and hairiness of roving resulted in this drafting arrangement is less. Since the fully drafted fibres are just condensed in a front zone in this system so the lapping tendency on the second top or bottom roller is increased highly if the stickiness of material in case of cotton and static charges in case of synthetic materials are processed. But in the case of the front roller, since the twist is penetrating up to the nip, lapping on the front bottom or top roller is less.
In 3 over 3 drafting arrangements, the maximum total draft can be employed up to 11. The thickness and hairiness of roving resulted in this drafting arrangement being more than 4 over 4 drafting systems.
Drafting roller pressure system:
When the material (sliver) passes between the nip of drafting rollers, it is attenuated by drafting rollers. Fibre slippage occurs between rollers during drafting. A certain amount of pressure is required to achieve better nip gripping of drafting rollers.
Roving condensing system:
When the sliver is drafted between the drafting rollers, the fibres try to spread out and cause unevenness in the roving. When widely spread fibres strand leaves the drafting region, it leads to an increased high fly level and hairiness in the roving to be produced. Thus a device is used to prevent the spreading of fibres in the roving after drafting. This device is called a condenser.
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[@pndehurycnml5981]

Bahut badhiya sir..❤️🙏

[@Sky_Gaming253]

Thank you so much sir

[@SapnaArt]

Thanku sir 🙏🙏

[@alarabi892]

Sir Can we use "Ring frame machine" after draw frame without using roving frame machine?

[@naturelove4307]

No, Because draft will be required to convert directly sliver to yarn is about to 400 to 500 ,that is not possible.
And yarn will be break.