What causes Neps?
Almost any mechanical process can cause the formation of neps, but the most likely ones include harvesting, ginning, and opening/cleaning in the textile mill. Neps are generally removed from the cotton fibres at only two places in the textile mill: the carding machine and the combing machine.
How do you reduce neps in yarn?
When flat speed increases, it reduces the neps content and short fiber content of sliver and increases the fiber parallelization, thus decreasing the unevenness. Irrespective of the flat speed, the yarn unevenness increases as the yarn becomes finer as expected.
What are fuzz Neps?
Fuzz Neps: A fault of short fuzz fibers. Count of Neps. Nep count is the no. of neps per 100 square inches of card web forming ( a standerd hank of sliver of 12 NE on a 40 inch wide card).
How can I reduce my Neps carding?
The number of neps above critical nep size shall be eliminated in carding by optimizing setting, grinding frequency, wire condition/replacement, suction, process parameters, etc. It is to be noted that neps below critical nep size will not influence yarn quality/fabric appearance significantly.
What is Neps removal efficiency?
Nep removal efficiency in carding is determined using the following formula [100 × (neps in the chute-feed – Neps in the carded sliver)/neps in the chute feed]. The higher the nep-removal efficiency the lower the neps in the carded sliver.
What is NEP count?
Nep count is the number of neps per 100 square inch of card web forming a standard hank of the sliver of 0.12 Ne on a 40-inch wide card.
What is NRE in carding?
The paper focused on the impact of carding performance particularly Neps Removal Efficiency (NRE) on the yarn quality. … The Neps are an undesirable factor which reduces the quality of the yarn and ultimately reduces the cost of the final products.
What are the problems that may be occurred due to short fibers during yarn production?
As per the above case study, short fibre influences yarn strength, neps, evenness and imperfections, processing waste, winding cuts, spinning end breaks as well as spinning productivity.
Which is the woven fabric fault?
Defect in a woven fabric where warp and weft threads do not interlace as desired. Broken end getting entangled with the adjacent warp ends. The breaks between reed and healds are more prone to form floats, especially when the warp loses its elasticity due to over stretching or over-backing during sizing.
How does the setting of plate Influence flat strip waste?
Wider front plate setting causes more flat strips waste and good cotton is lost as flat waste. … The object of the bottom plate setting is to transfer cotton from the cylinder to the doffer evenly. Wider settings will cause uneven web due to uncontrolled air currents.
How does a carding machine work?
In the carding process, the fibres are separated and then brought together into a loose strand (sliver or tow). The process involves use of machine that splits up the locks and tangled clumps of fibre and then lines up each fibre so that all the fibres are almost parallel with each other.