What is dref?
Disaster Relief Emergency Fund (DREF)
What is compact spinning?
Compact spinning is a novel concept generated through re-engineering of established ring spinning process by attaching a pneumatic zone to existing ring spinning machine. Compact spinning achieves a remarkable improvement in yarn quality and yarn structure through better utilization of fibre properties.
What is a DREF operation?
Minor emergencies, referred to as DREF operations, for which no appeal is launched, are considered to be grants and often fully cover the operation budget. …
What are the advantages of friction spun yarn?
Advantages of friction spinning system It can spin yarn at very high twist insertion rates (ie. 300,000 twist/min). The yarn tension is practically independent of speed and hence very high production rates (up to 300 m/min) can be attainable. The yarns are bulkier than rotor yarns.
What is Siro spinning?
Siro Yarn is made with a process of Siro Spinning or Elitwist spinning. In this, the yarn is made into 2 ply on the ring spinning machine. There are lot of benefits of Siro spinned yarns. Siro Yarns are available in Carded, Combed, Carded Compact and combed Compact.
What is spinning triangle?
The spinning triangle is a critical region in the spinning process of staple yarn. Its geometry influences the distribution of fiber tension at spinning triangle directly and affects the qualities of spun yarns. Spinning triangle division is one of the most effective measures, such as solospun technology.
What is Murata vortex spinning?
Murata vortex spinning (MVS) is based on the already existing air-jet spinning technology by Murata. Vortex spinning is another revolutionary system for the production of fasciated yarns, and is gaining greater momentum in the production of yarns from synthetics and cotton in pure form or blends.
What is friction spun yarn?
Friction spun yarns are the weakest yarns due to the presence of highly disoriented and folded sheath fibres with a low degree of packing. The yarns are spun in a coarse count range (over 40 tex).
What is Dref Spinning?
Friction Spinningor Dref Spinningis a textile technology that suitable for spinning coarse countsof yarnsand technical core-wrapped yarns. Dref yarns are bulky, with low tensile strength making them suitable for blankets and mopyarns, they can be spun from asbestos, carbon fibresand make filters was water systems.
How does the DREF system produce yarns?
Along with the frictional forces in the spinning zone the yarn formation takes place. The DREF system is used to produce yarns with high delivery rate about 300mpm. It produces a highly uniform yarn from diverse stock including short or difficult to handle at high production rates and low labor and energy expenses.
How is yarn formed in friction spinning system?
Yarn formation in friction spinning system. The mechanism of yarn formation consists of three distinct operations: feeding of fibres, fibre integration and twist insertion. The individual fibres are transported by air currents and deposited in the spinning zone.
What is a DREF-3 machine?
The DREF-3 machine is the next version of DREF-2 for improving the yarn quality came to the market in the year 1981. Yarns up to 18s Ne. can be spun through this system. This is a core-sheath type spinning arrangement. The sheath fibers are attached to the core fibers by the false twist generated by the rotating action of drums.