Wrap Reel lea count tester
INTRODUCTION
Its is used to prepare samples of sliver, roving and coarser yarns of a predetermined length to determine the linear density (count).
This instrument is an ergonomically designed table top model with rugged steel body construction for better stability and quality performance. Carefully finished drum surface with self loading top roller design ensures slip – free feeding. A resetable digital counter activated by drive shaft records the length of the sliver passed through the drum. The drum circumference is 1 yard with 14 “width, which facilitates accommodation of roving up to 18” lift.
Check upon Delivery
The instrument has been strictly and well packed. In consideration of various factors during the transportation should be paid to the following points before the installation. If there is anything abnormal please notify the Agent or relevant people of our company.
→ Check if the instrument has got any demage or deformation during the transportation.
→ Check if there is something wrong on the inner parts wiring and circuit board.
2. SAFETY
While designing the instrument, great care has been taken to minimize the risk of operator injury.
Safety Symbols
ATTENTION
MAINS (Power Supply)
FUSE
ROTATING PARTS HAZARD
HOT
Safety Precautions
Observe the regulations stated in this guide with a view to achieve maximum safe operating of the instrument. If the operator finds any difficulty, contact the person who can guide by going through this manual
1. Always keep the instrument secured against unauthorized handling and use.
2. Do not cross the path of the moving carriage during operations. 3. Never remove any cover when the instrument is connected to the main supply.
4. Always keep the instrument free from dust
3. TECHNICAL SPECIFICATION
Drum circumference:
1 Yard (914,4 ± 2 mm) as standard supply for Imperial measurement
1 Meter (1000 + 2 mm) as specific supply for Metric measurements
Drum width :14 inch (354 mm)
Bobbin Accommodation : 12 to 22 inch; 12 “to 18” is normal and 18 “to 22” with additional Wider attachment pack which is included in standard supply 60 mm,
Top roller:coated with natural rubber and carefully controlled mass
Counter :8 digit digital battery powered LCD counter (at least count: 1 )
Applicable standards: IS 4952
Physical Dimensions :Size(WDH): 670 x 263 x 482 mm Weight: 45.5 kg (Accessories included).
Procedure
1. Place the instrument on a flat surface.
2.Display in indicator shows “O and or eise Press the reset switch before turning the wheel.
3 .Place the sliver or roving bobbins in its place and lift the pattern up to Har on the wheel by hand and lift the feeder roller.
4.Rotate the wrap wheel using the handle to the required specimen length and stop rotation when is completed.
5. Cut and remove the specimen from the starting point.
6.When done, press “Zero Button” for a few seconds (7 to 10 seconds) LCD display is off. Before testing, press “Zero Button” LCD display starts showing 0 and follow regular test.
APPENDIX
Routine Check
1. Only a Qualified person should carry out routine maintenance.
2. Remove any dust or debris from the instrument as it accumulates.
3. Cleaning should only be carried out with a soft cloth. No aggressive cleaning agents must be used (such as solvents, paint thinners, acetone, etc.).
4. Keep the instrument in dust – free atmosphere.
5. Keep the instrument free from vibration.
Twist measuring in Yarn :
The most obvious thanks to live the quantity of twists per unit length of yarn is solely to straighten out a familiar length of the yarn and check visually to check whether or not the twist has been utterly removed.
General specification needed for twist measuring
Twist testing strategies depends on the specification, accuracy, demanded, from of the sample etc. normally the subsequent points is also followed for obtaining reliable result. They are-
sometimes twist isn’t distributed uniformly on a yarn. Speaking technically, the number of twist in an exceedingly materials is reciprocally proportional to its thickness. This from is ‘twist x weight=constant’’. And for to avoiding having bias in twist measuring, twist ought to be determined at mounted intervals on the yarn that’s one yard of distance that is appropriate.
Withdrawal of yarn over the tip of the package adds twist to a yarn, whereas withdrawal from the facet of the package doesn’t. The yarn ought to be withdrawn from the package within the manner within which it’d be usually employed in subsequent stage of process. The package ought to be mounted vertically on a peg and liberal to rotate regarding the peg because the yarn is withdrawn gently from it.
the particular take a look at specimen ought to be handled manually specified the fingers don’t bit the length over that the twist is truly measured.
within the case of plied and cabled small stuff and continuous filament yarn, a minimum of twenty specimens square measure to be tested if the length is five hundred millimeter in keeping with BIS (British Standards Institution). within the case of single small stuff, BSI recommends fifty specimens of twenty five millimeter every.
the strain is that the take a look at specimen should be constant. BSI recommends a yarn tension level of tex/2±10% grams. For example: A 40s necrotizing enterocolitis count (i.e. regarding fifteen tex) yarn would be maintained at a tension within the vary six.35-8.25 grams.
Techniques of twist Measurements
The most common techniques that are used for activity yam twist square measure listed below.
❶ Straightened fiber technique or the direct count methodology.
❷ Twist contraction technique or the straighten out and re-twist methodology.
❸ Twist to interrupt technique.
❹ Microscopic
❶ The straightened fiber technique
(A) Straightened twist tester
Principle:
Used just for testing single spun yarns, this system involves the untwisting of the take a look at specimen till all of the twist is removed. The completeness of the untwisting is verified by visual examination of the straightening of all of the fibers within the strand – this is often why the name ‘straightened fiber technique’. variety|the amount|the quantity} of turns needed for the untwisting is counted and also the number is split by the length of the take a look at specimen to reach the twist of the take a look at yarn turns per unit length
This technique is additionally called the ‘direct count method‘, because the twist within the yarn is directly counted.
Construction:
The below figure depicts the salient options of one yarn twist tester incorporating the straightened fiber technique. The instrument consists of 2 pillars, A and B, mounted on a rigid base C. On pillar A square measure mounted a fixed jaw D, a guide simple machine E, a tensioning arrangement F, a magnifying lens G and a flat solid H. Pillar B carries a jaw I that may be turned manually either manner by suggests that of handle K and also the variety of revolutions is recorded within the revolution counter J. A length of twenty five millimeter (or one inch), the take a look at length usually used, separates the faces of the jaws D and that i. A take a look at specimen L will be seen mounted between the 2 Jaws.
Straightened twist tester
Test Procedure:
The first step is to line the revolution spystealth counter to zero.
Next clamp the take a look at yam within the mobile jaw. Open the static jaw and lead the yarn through it then over the guide pulley; attach alittle weight to the yarn to present it the specified tension then shut the jaw to clamp the yarn.
Check, by suggests that of lens G if necessary, the twist direction of the take a look at specimen. Then victimization the handle, rotate jaw I in an exceedingly dextral or anti-clockwise direction therefore on straighten out the yarn.
Note the twist within the yarn being removed. once most of the twist has been removed, push a pointy needle through the center of the partly straight strand therefore it nearly touches the static jaw; then, searching through lens G, gently move the needle towards the opposite jaw.
provide the handle a final rotation either manner till the needle is within the nighest doable position to the mobile jaw.
Finally, the quantity of turns of the mobile jaw needed to straighten out the take a look at specimen is browse off the revolution counter and recorded.
Twist contraction technique or the straighten out and retwist methodology
Principle:
Also called the twist-and-retwist methodology, this system works on the principle that the twist during a given length of yarn, beneath beneath tension, is removed by untwisting. This causes the yarn to increase long. the first level of twist is then inserted into the yarn however within the other way. As a result, the yarn reverts to its original length (change from Z-direction to S direction or holding device versa). the quantity of turns needed to straighten out and retwist the yarn is noted and also the TPI is calculated. The contraction long once a strand of parallel fibers is twisted during a given direction can usually be adequate the contraction it suffers once it’s twisted within the other way.
Untwist-Retwist methodology
Twist contraction: The twisting along of 2 strands causes a contraction impact that has got to be famous so as to calculate the count of the plied yarn accurately. The twist contraction principle holds smart even once a strand of parallel fibers (or filaments) is twisted.
In general, if the length of the strand before twisting is L and upon twisting the narrowed length is L1, the twist contraction C is given by C = L – L1.
Extension on Untwisting: If the on top of yarn of length L1 were straight in order that no twist remains, the ensuing strand would have a length adequate L.
Contraction on Re-twisting: any, if the straight strand on top of were twisted within the other way of its original twist, specified constant level of twist is earned, the length of the ensuing yarn would once more be L1.
Twisting -retwist
A typical tension-type twist tester is shown within the figure. it’s it’s to use the twist contraction principle to single spun yarns. basically, it consists of 2 pillars, mounted on a solid base. A fixed jaw is mounted on a pillar. This jaw is connected to a tension scale that features a slippy weight that may be set at any needed purpose on the size, the lower finish of that may be a pointed tip. the entire scale is in impact alittle apparatus. At the bottom of this pillar may be a may be a mark.
The other pillar carries the mobile jaw I, that is connected to handle and a revolution counter through gears. The gear quantitative relation is like to show the TPI of the take a look at specimen at the tip of the take a look at. The mechanical counter displays four digits. The first 2 digits represent whole numbers whereas succeeding 2 indicate 2 decimal places. A zero setting knob is connected to the counter. The take a look at specimen mounted in between the fixed and mobile jaws. The specimen length during this instrument may be a may be a. In some testers of this type there’s an appointment to alter the specimen length by slippy the fixed jaw pillar on a find time for the bottom.
Tension kind Twist Tester
Test Procedure:-The slippy weight on the stress scale is first set in keeping with the count of the take a look at yarn and also the instrument constant, which can sometimes be provided by the involved instrument manufacturer. for instance, a specific manufacturer recommends that the subsequent formula be wont to gain the stress setting.
Tension scale reading = 156/English count
Yarn from the take a look at package is first gripped within the within the then light-emitting diode through the mobile jaw. it’s force through the latter jaw till the knife-edge tip of the apparatus pointer is precisely in line with the fixed index mark at the bottom. This jaw too is then closed.
At this stage, the take a look at specimen is beneath suggested tension and features a take a look at length or gauge length of 10″.
The mechanical counter is currently set to zero mistreatment the zero-set knob.
The twist direction of the take a look at specimen is discovered, if necessary by suggests that of a magnifying lens and also the handle is turned thus on straighten out the yarn.
because the twist within the ten in. specimen is removed, the yarn extends and also the tension in it falls; as a result, the apparatus pointer moves faraway from the index mark and eventually reaches its position of rest (i.e. the vertical position). At this stage, all the twist has been aloof from the sample.
The jaw is unbroken rotating within the same direction till ample twist has been inserted to bring the pointer step by step back to coincide with the index mark.
Thus, during this methodology, the twist is initial removed by straighten outing then replace by re-twisting the untwist and retwist principle.
The revolution counter reading is noted and recorded. As explicit earlier, this is often the worth of the TPI of the take a look at specimen.
Twist-to-Break Technique of Twist Measurements
The twist-to-break technique isn’t a reliable methodology for everyday tests with yarns and is so not a lot of used lately. Its mention here is just for historical interest.
Principle:
A specific short length of yarn is twisted during a twist tester till it breaks. Another specimen of constant length is then twisted to interrupt by twisting it within the other way. If Ns area unit the quantity of turns needed within the within the and N2 those within the second instance, the TPI of the yarn is given by (NS – N2)/ a pair of.
The microscopic technique
This technique is additional appropriate for analysis work on special model yarns instead of for routine yarn testing. terribly fact|the actual fact} that solely a really tiny portion of the yarn is tested at a time which the technique is so very slow makes it inconvenient for normal testing. However, the textile person is inspired to bear in mind of this system.
Principle:-A magnifier equipped with a graduated rotary sample stage is employed to live the spiral angle of the twist within the yarn. The yarn diameter is additionally measured. From these 2 quantities the twist per unit length is calculated.
RELATED LINK
for more details visit our
website link
Facebook Page link
Instagram page link
Gmail-link
