International Journal of Engineering Inventions

Critical Factors Affecting Roving Strength

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Analysis on the Defects in Yarn Manufacturing Process

5.5.5 Defects and causes in roving
5.5.6.2 Preventive action for improper handling of material
5.5.6.3 Preventive action for improper piecing in roving

5.5.4 Critical Factors Affecting Roving Strength
Critical factors affecting roving strength are given below:

The amount of twist and compactness of the roving.

Linear density and uniformity of the twist.

CV% of roving.
Fig. 18 Diagram of Roving Section
5.5.5 Defects and causes in roving
Following are the defects and causes in roving:

Roving tension

Improper handling of material

Improper piecing in roving

Roving breakage
5.5.6
Preventive action
5.5.6.1 Preventive action for roving tension
Roving tension is directly related to machine. The roving tension depends upon delivery rate and the difference
between flyer speed and bobbin. For preventive action we should keep the delivery length and the speed
difference constant then the tension in this case will be ideal.
5.5.6.2 Preventive action for improper handling of material
Roving material is very sensitive regarding to quality point of view. It is necessary to take care of material. The
material should be handled in such a way that fine dust must not affect the material. It must be avoided touching

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

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Page | 61
because of its sensitivity. Fresh material should be used for next process. This material should not be keep for
long time. If it will be kept for long time then it will create variation. C.V% increases if material is not used.

Supervisor must treat its worker in a proper way so that handling of material should be according to
policy of mill.
5.5.6.3 Preventive action for improper piecing in roving
Supervisor should train his workers in a proper way. If end breakage is disturbed then its treatment should be
proper. If piecing will not be proper then it will affect the next process.

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