Spinning internship report
Table of Contents
1.1 History
1.2 Business Dealing
Chapter 2 Overview of the Spinning department in the company
2.2 Sequence of Rotor Spinning Machine
2.3.1. Blendomat
2.3.2. CLP Precleaner
2.3.3. MXU multimixer
2.3.4. ClC3 opener
2.3.5. Vetal scan
2.3.6. Dustex
2.4 Carding machine.
2.4.1. Passage of carding machine
2.4.2. Different Actions At (TC08) & (TC10) Card
2.5 Draw frame Machine
2.5.1. Breaker Draw frame machine
2.5.2. Finisher Draw frame machine
2.5.3. Draw Frame machine major parts
2.6 Rotor Spinning Machine
2.6.1. Rotor Spinning Principle
2.6.2. Passage and working parts of Rotor Spinning Machine
Chapter 3 Introduction to Internship
3.1 Objective of Mill Training
4.2. Premier IQ2 (Evenness tester)
4.3. Wrap Reel
4.4. C.S.P. Yarn Strength machine
CHAPTER :-1 COMPANY OVERVIEW
The Vinod Denim Ltd. Was incorporated in 1983. With the far-reaching vision and foresight of the founder late Shri Mangalchand ji Mittal, (M. P. Dall mills, Hisser) the textile businesses of the Mittal family have been carried forward by the four sons of the Late Shri Mittal.
BUSINESS DEALING IN:-
- dark blue denim fabric of the manufacturer
- blue denim fabric of the supplier
- 100% Cotton fabric of exporter
- Denim upholstery fabric of importer
Vinod denim limited is an eminent manufacturer of high-grade fabrics. It is all due to our real-time experience and striving zeal, we have been able to produce quality fabric such as denim fabric, Knitted Denim fabric, warp indigo cotton, weft polyester Rigid/ Lycra/ SLUB/ Dobby & Printed denim. All these aforesaid products like Denim fabric, Knitted Denim fabric, etc are made according to the prevailing market trends, following each specification of international standards. Moreover, our fabrics have created a niche in the textile industry, by crafting immaculate fabrics, which fit the orders of every generation. Most importantly, we hold the prestigious membership of Ahmedabad Textile processors, providing our authenticity in the market.
CHAPTER:-2 OVERVIEW OF THE SPINNING DEPARTMENT IN THE COMPANY
2. 1. COTTON STORAGE GODOWN
Godowns are a kind of location where bale stock is safely stored. As per godowns, the bale stocks report is easily prepared on computer. In Vinod spinners Pvt ltd company in cotton, godown is big. In cotton godown, the maximum bales are spare up to 5000 to 8000 bales.
2.2 Process flow chart of rotor spinning
2.3 Blowroom machine
Basic Operations in the Blow room:-
Introduction:-
The blow room is the first step of yarn production in spinning mills. A section in which compressed bales are opened, cleaned and blended or mixed to form uniforms lap of a specific length is called the Blow room section. The cleaning efficiency of the blow room is 40 to 70%. This is the first section of the spinning line for the spinning of cotton yarn.
Functions of blow room:-
2. Detecting the metal objects and fire in fibre
3. Cleaning the fibre by removing the dust, dirt, broken seeds etc. and other foreign materials from the fibres.
4. Mixing and blending of different classes or grades of fibres 5. Removing foreign fibres and plastic contaminations
6. Uniform feeding to the next stage.
Principle of Opening and Cleaning:-
Opening:
The opening is the first operation in the blow room carried out to the stage of Flocks. ln the-blow room and to the stage of individual fibres in the cards.
In the stages of the opening, machines with an opening function have the task of separating clumps of fibre into smaller ones. The sizes of the clumps, and of the teeth that deal with them, are progressively reduced. In general, terms, grasping clumps of fibres with sets of teeth and dragging the clumps across another set of teeth or grids perform the opening function.
Cleaning:
With cotton, there are often seed coat fragments attached to them. It is difficult to remove some of the extraneous matter without vigorous mechanical action and without adequate opening. Every time a clump of fibres is divided, a new surface is exposed from which it is relatively easy to remove the loose unwanted matter (trash).
2.3.1 Working Principle Blendomet:-
In this zone, the basic function is to open the fibre from the bale where fibres are in a very compressed and disoriented state. The opening device has to penetrate into the bale and pick up the tuft of fibre during release from different bales simultaneously. The size of the fibre package is converted from 200 kg to 10 gm/tuft in this zone. The machine moves to cover the maximum number of bales. Generally, a roller with a toothed disc is used for opening the device. No beating action but picking is performed here.
As shown in the figure, rotating opening rollers fitted with toothed discs are made to traverse a line of preassembled cotton bales, the toothed discs plucking tufts from each bale as they move from bale to bale. The toothed discs give a gentle opening to prevent or minimize fibre breakage while producing smaller tuft sizes at higher production rates than the mixing bale opener.
Technical data:
- Traverse speed: 10~18 m/min
- Speed of take-off roller: 1400~1800 rpm
- Nominal take–off depth: 2.5~3.5 mm
- Several B/R lines:- Two B/R lines but one blended.
2.3.2. Working Principle of CL-P/Pre-Cleaner :-
In this zone, the basic function is to open the fibre tuft to a smaller size and to clean the tuft removing big sizes of trash but
The system comprises two rotating beaters with rods or flexible pins projecting from its surface and a series of grid bars positioned below the beater. The system is used as a first cleaning stage for cotton tufts with high trash content and therefore receives tufts from the automatic bale opener.
The large tufts which cannot get lost through the grid system, follow a spiral path around the beater to the outlet and make contact with the projections (pins) on the rotating beater surface several times. The tufts are then struck against the grid bars to eject coarse trash particles.
Technical data:-
- Diameter of beater: 700~800 mm
- Speed of beater: 400~800 rpm
- Grid bar setting: 2.5~3.5mm
- Number Of CLP: 2 CLP machine
2.3.3.Working Principle of MX-U/Multimixer:-
In this zone, the main function is to blend the raw material of different qualities to equalize and even the mean quality of the delivered material. Because natural fibre generally remains variation in quality.
The system employed in this zone as shown in fig. comprises six vertical chambers in sequence. The technology of the outlet is implemented in such a way that material is taken up by rotating rollers evenly from every chamber and delivered after mixing. Therefore, mixing takes place homogeneously at the inflow and outflow positions.
Technical data:-
- Storage capacity per chamber: 40~80 kg
- Speed of opening roller: 1000~1200 rpm
- Number of Machines: 1 MXU and 1MPM machine.
2.3.4. Working Principle of CL-C3:-
In this zone, the basic function is to open the fibre tuft to
smallest size and to clean the tuft to a greater extent removing even the smallest size of trash and dust which are trapped between fibres.
The system comprises 3 rotating beaters with carding saw tooth wire projecting from its surface
with different gradual point densities and a series of grid bars positioned below the beater. The system is used as a last opening and cleaning stage for cotton tufts in the blow room and therefore receives tufts from the coarse cleaner and opener.
Importantly, the beater speed should progressively increase from beater 1 to 3 (for example 900, 1100, and 1400 rpm). Hence, the mean tuft size is decreased from 1 mg by the first beater to 0.7 mg, and 0.5 mg by the second and third beaters. Cleaner CL-C3.
2.3.5. VETAL SCAN POLYSENSOR (48’S-SERIES) :-
COTTON CONTAMINATION CLEANING MACHINE WITH POLYSENSOR
The most effective way of removing colour as well as white/Transparent/Synthetic contaminants including polypropylene from cotton in the Blow room of spinning Mills.
Silent Features:-
- Independent setting for sensitivity
- Separate setting for delay timing
- Micro controlled based individual hardware for individual cameras ensures continuous monitoring
- Touch screen showing month-wise graphic reports
- Connectivity to the external world
- Interlocking facility between blow room machines against any fault like low air pressure
- Audio siren and visual indication to call the attention in case of any fault
- Any number of profile settings for different cotton can be stored Capacity: 1000kgs/hr
- Touch screen software and machine microcontrollers work as a MASTER-SLAVE combination
- A unique collection system eliminates turbulence to pick up and transfer all ejected contaminates continuously to the bag
- LNA Linearised Nozzle Array for better ejection
2.3.6. DUSTEX:-
This is of particular advantage to downstream processing: Thoroughly dedusted slivers ensure optimised running behaviour during yarn formation, e.g. in rotor spinning machines, but also significantly higher efficiency rates (fewer yarn breaks) in the winding, knitting, warping and weaving.
Dust Separator DUSTEX SP-DX:-
(1) This fan sucks the material off the Cleaner(2) The distribution flaps distribute the tufts over the working width of 1600mm.
(3) Major dust removal takes place by the tufts hitting the sieve surface.
(4) The material drops into the suction system and is transported to the cards by the infinitely variable fan.
(5) The separated dust is permanently sucked off.
INTRODUCTION
Carding is one of the most important processes of the short-staple spinning system. Carding is an operation where the tuft condition of the fibres is converted into an individual fibre form. The separation of fibres in individual form is one fundamental operation of carding while the other fundamental operation is the formation of the card sliver. Carding is a very important process because unless the fibres are separated into individuals, they cannot be spun into smooth and uniform yarns nor can they be blended properly with other fibres. In Vinod Spinners Pvt Ltd. there are 8 carding machines TC 08 and 8 machines TC 10 made by Trutzschler (Germany).
Object of Carding
- To individualize the fibres.
- To remove impurities.
- To clean cotton thoroughly off the lighter dirt & trash as well as to remove a certain proportion of neps & short fibres from the opened material.
- To convert the Blow room lap/chute feed sheet into the loose, roughly parallel, untwisted strand fibres called ‘Sliver’.
MAIN PARTS OF CARDING MACHINE
2. Opening roller
3. Feed plate
4. Feed roller
6. Segments of taker-in
7. 2 Mote knives with suction hoods
8. 6 Back stationery flats and suction hoods
9. Lower profile plate and upper profile plates
10. Cylinder covering segment with suction hoods 11. Revolving Flats
12. Cylinder
13. 4 Front stationery flats and suction hoods
14. Doffer
15. Doffing roller (Stripping roller)
16. Cleaner roll
17. Squeezing rolls
18. Deflector blade
19. Trumpet
20. Calendar rollers
21. Coiler KH
22. Can Changer KHC
TC 08 & TC 10 CARDING MACHINE:-
TC 08 & TC 10 is a high-production carding machine made by Trutzschler. It helps a lot in improving the quality of yarn by controlling the majority of the faults at this stage.
2.4.2. DIFFERENT ACTIONS AT (TC 08) & (TC 10)
CARD:- FEED ROLLER AND LICKER-IN:-
Point-to-point action is taken place between them. Fibres are passed through the feed roller to the Taker-in and at this point, the opening is taken place. There is a mote knife, which diverts the fibres to the main grids that are placed beneath the Taker-in. in this way heavy trashes are removed and the main cleaning is taken place in this region.
LICKER-IN AND CYLINDER:-
Point-to-back action is taken place between the cylinder and licker-in. Fibres are transferred from the licker-in onto the cylinder. Wires are mounted on the surface of the cylinder and licker-in so that the small tufts opened up into the individual fibre. Cylinder and licker-in are moved in opposite directions. The diameter of the cylinder is much greater than the licker-in.
CYLINDER AND FLATS:-
The main carding action is taken place between the cylinder and the flat. The speed of the flat is about 4 to 6 inches per minute. Due to the speed of the flat being about 60 times lesser than the swift and due to the point-to-point action following actions/functions are taking place:
• Fibers become in an individual form
• Extensive opening and cleaning is also taken place
• Removal of short fibre, embedded into the empty places between flats
• Neps are removed
The cylinder moves clockwise and the flat moves in an anticlockwise direction. The distance between the cylinder and the flat is about 3/1000 inches.
CYLINDER AND DOFFER:-
In this region, the web is formed. The Doffer having a diameter of about 27 inches rotates in an anticlockwise direction just picking the fibre from the cylinder and web formation is occurred on the surface of the offer. The surface speed of the doffer is about 25 times lesser than the cylinder for the web formation.
TRASH AT CARD:-
The trash that is present on the card consists of Neps, dust & foreign impurities. These wastes are collected in a separate waste collector after they pass through grid bars through air suction.
REMOVAL OF NEPS AT CARD:-
Actually, Neps are generated due to the seed and also due to the continuous beating at the blow room. These Neps form thick and thin places in the yarn.
Therefore for removing these Neps, wiry surfaces of different velocities are used at carding. Neps are removed at carding region (between flats and cylinder).
FORMATION OF THE SLIVER:-
There is a stripping roller that removes the web from the surface of the offer. After passing through the calendar roller (that grips the web) a funnel-type device is used (called a trumpet guide), which condenses the web into a sliver.
COILER MECHANISM:-
This mechanism consists of two disks (coils) i.e. inside and outside disks. Sliver from the trumpet guide is dropped into the silver can through the inside disk in the form of a coil.
SLIVER CAN:-
It is a drum that collects the sliver from the card. The cans used at card TC 8 & TC 10 in Vinod Spinners Pvt Ltd. have a height of 42 inches and a Diameter of 1000mm. And Sliver is stored in one Can within 8000 meters.
FUNCTION OF DIFFERENT PARTS:-
The detail of the basic function of different parts at the TC08 & TC10 card is given below:
Tuft feeder:-
The Tuft feeder has the function to feed the fibres into the card. The fibres are taken from the chute and then thrown on the feed plate.
Feed Rollers:-
Feed rollers take the fibres lab and feed them to the taker-in. Feed rollers are about 5/2 inches in diameter and the width of the card (is 39-40 inches). Between the feed roller and the taker, point-to-point action takes place and the trash is removed.
Licker-In:-
Licker-in has the main function of cleaning the fibres. It takes the fibres from the feed rollers and opens them. In TC 08 & TC 10 three licker-in rollers (web feed rollers) are used each roller is about 10 inches in diameter. The 1st licker- is covered with spikes while the 2nd and 3rd licker-in is covered with saw teeth wire. Below and above these rollers the suction is provided. As the fibres are opened the remaining trash from the fibres falls down and is collected into the trash collector. This trash is known as DROPPING. This trash cannot be reused and is sold into the market. It is the last point where the trash can be removed. Between the licker-in and the cylinder, the point-to-back action is taking place. The fibres are transported to the cylinder from the licker in the roller.
Cylinder:-
It is a large hollow cylinder mounted in the middle of the card. The main carding of the fibres takes place between the cylinder and the flat set. The cylinder has a diameter of 50 inches. The surface of the cylinder is also covered with the wire with the sharp head. The thickness, hardness and height of the wire are less than that of the offer and the taker-in roller but the no of heads per inch is higher than that of the taker-in and the offer. Between the main cylinder and the flats, the point-to-point action is taking place and the carding action is taking place. In Vinod Spinners Pvt Ltd. the speed of the cylinder is kept at 550rpm.
Revolving Flat Set:-
The flat set is mounted on the top of the cylinder and helps in the doffing effect of the cylinder. In TC 08 & TC 10 cards there are a total of 84 flats usually made of aluminium, in one flat set out of which 27 are in working condition. Each flat set has sharp wires on it. The top set or flat set has a length of about 39-40 inches but the thickness, and width; no of wires per inch vary with the flat set. Usually, the flat set has a width of about 1.5-1.75 inches and 450 wires per square inch. There are two brushes on the top of the flats which are used to clean the flats. In Vinod Spinner Pvt Ltd. usually, the speed of the flat set is kept between 380-400 mm/min.
Pre and Post-Carding Segments:-
The function of the pre and post-carding segments is to provide extra carding elements to the fibres. The more the carding elements are in the carding zone better carding (opening and individualization) happens. These segments are provided between the Licker-in and the flats (pre-carding segments) and between the flats and the doffer (post-carding segment). Point-to-point action is there between the pre/post carding segments and the main cylinder. In TC 08 & TC 10 cards there are 3 sets of stationary flats as the pre-carding segments and 6 sets of stationary flats as post-carding segments.
*Each set contains two stationary flats.
Doffer Roller:-
Doffer roller has wire on its surface. It has the main function of transferring the fibres from the cylinder to the take of the roller. It takes individual fibres from the cylinder and converts them into a web. It rotates with a surface speed of about 30-35 rpm. Between the main cylinder and the doffer the point-to-point, action is taking place and the neps are being created there in the fibres.
Stripping Roller:-
When the fibres from the doffer roller come out the stripping roller stripes them. It has a surface diameter of 7 inches.
Calendar Rollers:-
Calendar rollers have the sole function of calendaring i.e. to press the fibre stand (silver). When the fibres (in the form of a fibre sheet) come out, they are passed through the trumpet and then to the calendar rollers. In TC08 & TC 10 cards there are two types of calendars. One is at the front of the card called the front calendar rollers (105 mm) and the second is on the coiler called the coiler end calendar rollers (50 mm). Both have a smooth surface and press the sliver so that the sliver gets some strength and can easily be wound and unwound.
Coiler or Can Changer:-
Coiler has the function of winding the sliver into the can. Coiler has a calendar roller, which presses the sliver before the winding. The sliver is wound in form of the circular sheets in the can. The coiler and the can rotate in such a way that the coiler rotates in high speed than that of the can, forming the sliver sheets in the can.
OPERATIONAL PROCESS OF THE CARD TC08 & TC10
The Tuft feeder feeds fibres into the card back (licker-in). The licker-in (three rollers with the spikes and the sow teeth covering) removes the trash particles from the fibres. Then the fibres are fed onto the cylinder. The cylinder further spreads out the fibres with the help of the top set or flat set. The cylinder and the flat set rotate in opposite directions. The gauge between the cylinder and the top set is set in such a way that the fibres should be completely parallelized in the axis of motion. Then the cylinder delivers the fibres in the form of a fibre sheet to the offer. The offer simply takes the fibres from the cylinder and delivers them to the take-off roller or the doffing roller. From the doffing roller, the fibre sheet is converted into the form of a sliver (fibre stand) with the help of a trumpet. Then it is passed through the front calendar rollers and then wound into the can with the help of the coiler. The coiler also has a metallic trumpet and calendar rollers. The coiler speed is more than that of the can. This difference in the speeds favours the winding of the sliver into the can.
WASTES AT CARDING MACHINE:-
Following are the types of waste at carding machine;
• Licker-in waste
• Fly
• Trash
PRODUCTION FORMULAS of CARDING MACHINE
It can be calculated as follows;
Production Rate (kg/hr) = Delivery Speed MPM X 60 X 1.0936 / 840 X 2.2046 X Hank of sliver
DRAFT:-
The degree of reduction in the linear density of the fibre material is called the draft. The draft can be expressed in two forms:
(1) Actual or Technical Draft Actual Draft = Linear Density of Input / Linear Density of output
(2) Mechanical Draft Mechanical Draft = Linear Speed of Output / Linear Speed of Input
MOISTURE AND HUMIDITY:-
The relative humidity at the carding section should be 50%-55%. The moisture in the material should be 4.40%.
CONTROL MECHANISMS IN THE CARD TC08 & TC10:-
Various control mechanisms are installed in the card all the TC08 & TC10 are controlled by the main card commander.
The main functions are given below;
• To control the speed of different rollers as required
• To control the pressure at different rollers.
Technical Data:-
Number of machines: - 16
Feed Material: - Chute Feed System
Hank of Sliver: - 0.090
Auto levelling: - equipment
Number of flats: - 84
Number of Licker-in:-3
Delivery speed: - 50-300 pts/min.
Cylinder speed: - 530 RPM
Flat Speed: - 400mm/min
Doffer Speed:- 35 RPM
2.5 Drawframe machine
INTRODUCTION:-
Despite of many advantages of the carding process, it has a big drawback of producing variation and misalignment of the fibres within the card sliver. The alignment and the slight parallelization achieved at the carding region between the main cylinder and flat largely disappear again because of the doffing action at the offer. During the transfer of the fibres from the cylinder to the doffer hooked surfaces in the fibres arise. About 50% of the fibres in the card sliver have trailing hooks, 15% of fibres have leading hooks and 15% of the fibres have double hooks and only a small portion (20%) of the fibres remain straight. To produce a strong and uniform yarn it is necessary to straighten and align the fibres and to improve the evenness of the sliver. All of these objectives are achieved by the drawing process carried out by a machine called the draw frame. At the draw frame, several card slivers are drawn or stretched between several pairs of rollers. As the fibres are attenuated or drafted, the fibres are straightened and aligned to the axis of the sliver in the direction in which they are drawn. Drawing is the final process of quality improvement in the spinning mill.
OBJECTIVES:-
2. Improving Fiber Orientation along the sliver axis.
3. Fiber Blending
4. Some dust removal
Draw Frame Theory:-
Draw frame machine for combining and drawing slivers of textile fibre (as of hemp for rope manufacture or cotton spinning.) drawing is the operation by which slivers are blended, doubled and levelled. In short, staple spinning the term is only applied to the process at it is the process of yarn manufacturing in which the sliver is elongated when passes through pairs of rollers, each pair moving faster than the previous one. This permits combinations of several slivers. These slivers are drawn and elongated to straighten and create greater uniformity.
IMPORTANCE OF DRAW FRAME:-
To paralyzation of fibres and blend the carded sliver, a draw frame is needed. In carded slivers, fibres are present in hooks form i.e., trailing hooks and leading hooks. To parallel, these hooks are in the draw frame used. The majority of fibre hooks in a carded sliver are trailing hooks while leading hooks are comparatively fewer. Trailing hooks are also known as major hooks while leading hooks are known as minor hooks.
TYPES OF DRAW-FRAME MACHINES:-
(1) (2.5.1)Breaker Draw-Frame Machine:-
Feed material is card sliver. During this process, 6 carded slivers are fed to this machine to produce parallelized breaker slivers. Breaker Draw-Frame is without Auto leveller.
Technical Data:-
Type of Machine:- 4
machine TD 07 & 4 machine TD 9T
Number of Doubling:- 6
Hank of Sliver: - 0.100
(2) (2.5.2.)Finisher Draw-Frame Machine:-
Feed material is breaker draw frame drawn sliver. During this process, 6 breaker slivers are fed to this machine to produce more parallelized & uniformed finisher slivers. Finisher Draw-frame is With an Auto leveller type machine.
Technical Data:-
Type of Machine: - TD 08
Number of Doubling: - 6
Hank of Sliver: - 0.100
WORKING PRINCIPLE OF DRAW-FRAME:-
A Four to eight-card or draw frame sliver is fed to the drafting arrangement. A feed roller pair above each can feeds the material without a false draft. The slivers run into the drafting arrangement subjected to a draft of 6 to 8 and leave it as a web and condensed into a sliver immediately.
This sliver is then guided through the tube via a passage of the tube gear into a can, in which it must be laid in clean coils with optimal utilization of the space in the can by the sliver compressing with passing it through calendaring rollers.
2.5.3. DRAW FRAME MACHINE:-
MAJOR ZONES
Trutzschler TD08 draw frame can be divided into the following zones
2. Guide Roller
3. Auto-leveler (TD-DL)
4. Drafting zone
5. Coiler Section
6. Suction Section
1. CREEL ZONE
sliver and stop the machine when the sliver breaks. In Vinod Spinners Pvt Ltd. 6 cans are placed under the creel and one end of the sliver is taken and fed into the drawing machine.
2. GUIDE ROLLER:
It guides the passage of feed slivers and acts as a stop motion when the feeding sliver breaks.
3. AUTO-LEVELLER:
The main task of auto levelling is to deviations in mass per unit length to eliminate.
4. DRAFTING ZONE
It has the sole function of drafting. Drafting means the reduction of mass of a sliver per unit area or the increase in the length per unit mass (two ways of describing the function). The drafting zone consists of a roller arrangement. Top rollers are synthetic while bottom rollers are made up of steel and are fluted. These rollers are driven by a servo motor and belt. On Trutzschler draw frame TD08 the roller arrangement is 4/3.
Drafting performed by back rollers is not so prominent; however, front rollers perform the actual draft. The draft in the back rollers is known as the Break Draft because the back rollers just break the sliver stand and there is no effect on the mass per unit length. The Main Draft occurs in the front rollers. Here the sliver stand is reduced to the required mass per unit length value of the draft. The total draft is the multiple of the break draft and the main draft.
5. COILER SECTION
The drawn sliver coming out of the calendar rollers is passed through a coiler tube fixed on a coiler plate.
The coiler gears fixed on the coiler plate help to rotate the coiler tube so that slivers can be laid in the can in form of special coils.
The diameters of the can are 450mm. The can rests on the rotating plate, with the rotation of the plate it can also rotate. The rate of rotation of the can is kept slower than the rate of rotation of the coiler tube. This helps in the proper deposition of drawn slivers in a spiral arrangement. The sliver deposition rate is kept slightly higher than the sliver delivery so that blockage of the sliver in the tube may be avoided. However, this difference should not be too large to avoid false drafts.
Doffing of cans:
In Single-step changers full cans are replaced by empty ones at full speed, i.e. without stopping the machine. In Multiple-step machine is brought to a stop during the change.
Signal Lamps:
Signal lamps are provided on the machine to indicate the reason for the stoppage of the machine Understand each signal lamp and its purpose in the machine.
Display Panel:
It displays various operating machine parameters production like speed, etc. Understand the details in the display panel accordingly and work.
6. SUCTION SECTION
In Trutzschler draw frame as the fibres move swiftly over the surface of the drafting rollers, dust and lint may be dislodged into the air. The purpose of the suction system on the draw frame is to remove these particles so that they might not get deposited on the surface of the drafting rollers and also maintain a dust and lint-free working environment. The accumulation of the fibrous mass on the surface of the rollers causes unevenness in drafting and sometimes also causes sliver breakages causing the machine to stop. The air suction system used on the TD 08 & TD 07 & TD 9T draw frame is shown below:
STOP MOTIONS
There are four types of stop motion used in the TD 08 & TD 07 & TD 9T draw frame
• Stop motion for overlapping (on the drafting rollers)
• Stop motion on the web gathering
• Stop motion on the cooler
Digital Auto levelling:-
Based on the measured values, the levelling processor calculates a nominal value for the high-dynamic AC servo drive. It is transferred exactly at the moment when the measured piece of sliver arrives at the levelling point within the main drafting zone. A planetary gear superimposes the constant basic speed of the main motor with the variable speed of the servo drive. It then only needs to provide the differential power for the Auto levelling function. Ensured by this concept and supported by the increased dynamics of the servo drive, the correction speed is always sufficient even with delivery speeds up to 1000m/min. thus, piecing and unevenness in combed slivers are also eliminated.
PRODUCTION FORMULAS of draw-frame:-
It can be calculated as follows;
Production Rate (kg/hr) = Delivery Speed MPM X 60 X 1.0936 / 840 X 2.2046 X Hank of sliver
DRAFT:-
Draft= delivery hank /Feed hank X No of doubling
Continue read,
Part 1 Spinning Internship report - Alok (Spinning and Testing)
Part 2 Textile testing internship report
Part 3 Internship report in the garment Industry
Part 4 Knitting industry Internship report
Part 5 Spinning Internship report - Pashupati (Spinning and yarn Testing)
Part 6 Garment Internship report - Komal, Ahmedabad
Part 7 Internship report in Printing and embroidery industry (Mayur-Jetpur)
Part 8 Printing unit Internship report
Part 9 Spinning internship report - Vinod spinners, Ahmedabad
Part 10 Weaving Internship report (Donear mill)
