Monday, February 24, 2020

ROVING FRAME OR SPEED FRAME OR SIMPLEX MACHINE AND OBJECTS OF ROVING FRAME ( SIMPLEX)


ROVING FRAME OR SPEED FRAME OR SIMPLEX MACHINE:

The roving frame/speed frame or simplex is a machine which comes between draw frame and ring frame or between comber and ring frame machine. The drawn sliver is used as a feeding material in simplex machine. After completion of this process, the resulted material is called roving. We can say that "the simplex is  a machine which converts the drawn sliver into thin strand of fibres having some amount of twist". The sliver is drafted many times from its original length during roving frame process and little amount of twist is inserted to it to improve the strength of roving. This roving is wound on to the large conical packages. These packages are used as input material during ring frame process. The weight per metre of sliver is reduced up to great extent and it is made suitable for ring frame.

OBJECTS OF SIMPLEX OR ROVING FRAME:

The roving or simplex frame machine is used to achieve mainly following objectives:

To convert drawn sliver into roving and to make it suitable for ring frame process.

To reduce the linear density of sliver (weight per unit length).

To insert a little amount of twist in the roving to improving strength of it.

To make large conical package of roving suitable for ring frame.

To ensure easy and safe transportation of material by making large packages.


PASSAGE OF SIMPLEX OR ROVING FRAME MACHINE:



° The sliver obtained from draw frame or after combing is used as feed material in simplex or roving machine.

° This sliver is put into large can.

° This sliver first of all passes through separators.

° From this point, sliver goes over the guide roller and then tensioning rollers.

° Now the slivers enter into drafting zone, where it passes between drafting rollers. Generally, a draft of 6–15 draft is employed to the fed sliver. The drafting system attenuates the sliver many times of its original length and reduces the weight per unit length of sliver.

°  The output  material(roving) after drafting has very poor strength due to low linear density, therefore it needs a little amount of twist to hold the fibres together. The drafted strand of fibres passes through flyer to provide this twist, Usually 30-65 turns per meters are inserted into the roving.

° There are spindles in the flyers on which the twisted roving gets wound.

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