Monday, 27 April 2015

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The combing methodology is regularly used to deliver smoother, better, stronger and more uniform yarns. Consequently, combing is ordinarily kept into a high review, long staple characteristic strands. As of late, searching has been used for redesigning the nature of medium staple strands. What's more, a yarn made of combed cotton needs less bend than a checked yarn. Be that as it may, these quality enhancements are acquired at the expense of extra consumption on the machines, floor-space, and workforce, together with a loss of crude material.To enhance the yarn quality, the comber must perform the accompanying operations: 

➢ Disposal of definitely foreordained amount of short strands 

➢ Disposal of the remaining contaminations

➢ Disposal of an expansive extent (not all) of the neps in the fiber material

➢ Development of a bit having most extreme conceivable equality

➢ .Creating of all the more straight and parallel filaments. Disposal of short strands creates a change mostly in staple length, additionally influences the fineness of the crude material. The micronaire estimation of combed  bit is somewhat higher than that of feedstock (disposal of dead strands). Likewise the level of parallelization may diminish the between fiber grip in the fragment to such a degree, to the point that strands slide separated while being hauled out of the can – i.e. bit breaks or false drafts may be created. 

Sorts of uses: 
The measure of material combed out fluctuates inside the extent 5 – 25% of the in food stock. Three noteworthy gatherings of turning factories utilizing combing are as per the following: 

Long staple combing mills: Preparing top of the line, extravagant cotton of high quality, containing a low extent of short strands and minimal earth. The item is a fine to fine yarn of top quality. The requests put on ability and aptitude of working workforce is correspondingly high, as they are in the outline and upkeep of the machines. Yarn creation is low while the era of noil is high. 

Medium-staple Combing mills: here medium cotton qualities with a broad of value parameters are spun to medium (to fine) yarns of good quality at monetary creation costs. The methodology is tricky in that it needs to attain to a high strand of value and in the meantime give high generation requiring little to no effort. The greatest requests set on medium staple combing must be satisfied by ideally prepared workforce. 

Short (or medium) staple combing mills: crude material utilized have the same as that for the creation of checked yarns. In correlation with a checked yarn, thecombed yarn ought to mainly display better smoothness and quality. In this mix with low-level noil level (6 – 14%). This methodology is the most broadly utilized as a part of practice.

Objects of Comber: 

To uproot the short fibers beneath a preselected length so that the spinner empower to create better or better quality of yarn that can not be conceivable in checking state.

Disposal of remaining pollutions.
Disposal of extensive extent (not all) of the neps in the fiber.
Development of fragment having most extreme conceivable equality.
To straighten the fibers.

Commitment of Comber to Yarn Quality: 

To enhance the consistency and quality
Enhance the spinning estimation of fiber.
Diminish the neps in the yarn.
Enhance smoothness and brilliance of yarn.
Create much clear yarn.
Enhance the efficiency of the following methodology.
Diminish the bushiness of the yarn.
Enhance better twist conveyance in the yarn.

Significant Manufacturers of Comber: 

Marzoli Spa, Italy
Laxmi Machine Works Limited
Toyoda Textile Machinery, Japan
Rieter Machine Works Limited, Switzerland
Zhejiang Huahai Group, China
Jinwei Textile Machinery, Co. Restricted.

Hook Fiber: 

The undesirable bowing of the fiber closures produces fiber hook. It is the impediments of web development at the card.
According to an examination by Morton & Yen in Manchester, the fibers in the web:
All the more then 50% have trailing hook
Around 15% have driving hook
Around 15% have twofold hook
What's more, under 20% of the fiber have no hook.

Hook fibers successfully change over more fiber to short fibers and these can't be allowed in the yarn. They should accordingly be evacuated before yarn arrangement. This could be possible either by drafting at draw frame or combing at comber.

Obliged no. of Machine Passages: 
The comber for the most part straightens out the main hooks. That is the reason driving hook must be displayed to the comber. Inversion of the hook happens at every preparing stage between the card and drawing I, drawing II and comber. Subsequently, positive number of machine sections is needed in interceding stages. Between the card and comber there must be a significantly number of entries, and an odd number between the card and ring spinning machine. In rotor spinning machine, the demeanor of hooks is of little importance.

Arrangement of Raw Materials for Comber: 
The raw materials conveyed by the checking machine are not suitable for combing both as respects structure and fiber course of action. In the event that card bit were food to the comber, then genuine nipping by the pinching plates (Figure I) could happen just on the high focuses, with the danger that the nippers couldn't hold the less emphatically packed edge zone of the fragments. These could be hauled out as clusters by the barrel combs. That is the reason a sheet with most prominent conceivable level of equality is along these lines needed as in food to the comber.

A decent parallel air of fibers inside the sheet is a further essential. In the event that the fiber lies across the strand (an in fig. II), even long fibers are introduced to barrel combs as of they were short fibers (as demonstrated in b) and they are killed thusly. This speaks to pointless loss of good fibers.

Sorts of Comber: 

There are diverse sorts of combers are accessible. These are given underneath:
Rectilinear Comber (with stationery or swaying nipper)
Circular comber
Rotary comber
Hackling machine (bast fibers)

Fundamental Principle of a Comber (Combing arrangement/ cycle): 
One article has expounded on essential standard of a comber. So here just title of comber standard is given beneath.

Lap nourishing by food roller
Lap nipping by the nipper
Combing by the cylinder
Nipper opening and sending
Detaching roller in reverse development
Combing by the top comb
Detaching roller forward development
Beginning another cycle
Cleaning of cylinder comb

Combing Faults: 
Officially one article has distribute on Problems, Causes and Remedies of Combing Process. So here in no time portrayed about it.

a) Cutting across: Thick and slim places across the width of th web. 
The issue begins in the laps attributable to the utilization of off base setting, unreasonable draft at the lap previous.
Mistaken timing of the detaching roller.
Top comb setting too profoundly.

b) Curling: The term is connected when a gathering of fibers twists as they leave detaching roller.
Flawed detaching roller covering.
Soil in the top detaching rollers.
Unnecessary brush speed.
Twisted needle of cylinder and top comb.

c) Cotton not combing at one head: 
Pawl not gearing legitimately with food ratchet wheel.
Remote matter wedge in the middle of nipper and food plate.
Harmed piece of cylinder and top comb.

d) Detaching roller lapping: 
Inaccurate air condition.
Oil on rollers
Sticky matter or earth on rollers
Exhausted roller covering.
Awful top cleaners.

e) Irregular bit: 
Intemperate strain on logbook roller.
Uncalled for roller setting.
Defective conformity of suction unit.
Whimsy of roller.


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