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FRICTION

Constant Tension Transport with Electronic Servo Drive (CTT-E) is a dynamic test instrument that is available as a mini laboratory for yarns. With its interchangeable test modules, the CTT-E can run more than 10 tests on the same instrument for all natural and synthetic yarns as well as technical yarns such as aramids, carbon, glassfiber and spandex. With this versatility along with its dynamic test principle that will test every section of the yarn, the CTT-E offers the ability to eliminate high cost of running trials on actual production machines before the yarn is sent to the next textile process.

CTT-E ALL-IN-ONE DYNAMIC YARN TESTER

LH-450 CTT-E

  • Electronic Servo Drive and Tension Arm System that maintain 2g-1000g constant input tension at test speeds between 20-1000m/min

  • Offers dynamic test conditions that tests every section of yarn to predict yarn behavior and avoid high cost of running trials on production machines

  • Easy to install test modules that allow measurement from coefficient of friction, entanglement count to yarn appearance on the same instrument

  • Four Tension Arms with different max tension and sensitivity ranges

  • Available with Standard (1000g) and Spandex Range (100g) tension measurement heads

  • Applicable for all types of natural and synthetic yarns, including cotton, polyester, nylon, wool, silk, acrylic, flax, viscose, carpet yarns

  • Functional tests for technical yarns such as aramids, carbon, spandex, glassfiber and monofilament

CTT-E SPANDEX DYNAMIC YARN TESTER FOR SPANDEX

LH-450S CTT-E SPANDEX
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FRICTION

Elastomeric yarn has high stretch and recovery properties, which are affected by tension on the yarn during fabric production and yarn covering.

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Lawson Hemphill Constant Tension Transport for Elastomeric Yarns, CTT-E is a dynamic quality control test instrument, specifically designed for the elastomeric yarn market in mind.

 

Conventional static tensile testers can only measure small test lengths at slower test speeds. This does not reflect the process conditions that the elastomeric yarns will be facing. The CTT-E provides a dynamic test platform to measure the yarn properties and performance factors such as Draw Ratio, Elongation %, Unwinding Tension, Hot Air Shrinkage as the yarn is moving at test speeds from 10m/min up to 500m/min.

 

This speed range along with the sensitive tension heads provides true information regarding yarn behavior during fabric formation, air or mechanical covering and comfort level of the end product.

 

The CTT-E can be equipped with optional Elastomeric Yarn Feeder to measure the Unwinding tension under conditions that are very close to zero draft.

  • Input Tension Control

  • Output Tension Measurement & Optical Yarn Break Detector

  • Electronic Drives (10-500 m/min)

  • Positive Yarn Feeder (EYF LH 455) Optional

DFM

DFM - DIGITAL YARN FRICTION METER

LH-604 DFM
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FRICTION

The LH-604 Lawson Hemphill’s Digital Friction Meter is a reliable and economical method for computing yarn coefficient of friction (μ). Windows software has been added which allows the DFM readout to be connected directly to your personal computer or lap top with a complete statistical package. Readout data includes coefficient of friction (μ), COF averages with standard deviation statistics, limits for high and low and one-button transfer of results to Excel or CSV file. Also graph and histogram are provided.

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Variations in stitch length relate directly to changes in the coefficients of friction of the yarns being run. High coefficients are now recognized as causing yarn breakage, excessive consumption of yarn and inferior quality. Management can save many dollars and maintain quality standards by reducing stitch length variations by controlling draw tensions.

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The LH Digital Friction Meter adds another dimension of versatility to the measurement of yarn friction. In addition to being able to be stand-mounted for quality control functions and laboratory use. It is direct reading, easy to use, accurate and reasonably priced. It has been engineered to be as rugged and versatile as possiblw without sacrificing precision and sensitivity. With proper care, this instrument should remain accurate for many years.

  • Ability to delete undesirable tests.

  • Ability to arrange only rejected packages results.

  • Graph and histogram adjustable scale or automatic mode.

  • Ability to pre-select length of yarn to run before the test starts,in order to get equilibrium to the new package.

  • One-step zero calibration.

  • Printout of test results.

  • Ability to give alphanumeric identification number to each package tested.

  • Work with laptop or desktop.

  • USB connection to computer.

YFM

YARN FRICTION METER

LH-603 YFM
LH-603 YFM-Yarn Friction Meter.png

FRICTION

Lawson Hemphill Yarn Friction Meter, YFM is a small, handheld, portable instrument that measures the coefficient of friction very quickly and accurately. It provides very quick feedback on the effects of wax, paraffin, sizing material on the overall yarn friction values.

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The Yarn Friction Meter adds another dimension of versatility to the measurement of yarn friction. In addition to being able to be stand-mounted for quality control functions and laboratory use, it can be hand held to measure yarn under actual operating conditions. It is direct reading, easy to use, accurate and reasonably priced. It has been engineered to be as rugged and versatile as possible without sacrificing precision and sensitivity. With proper care, this instrument should remain accurate for many years.

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