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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.


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



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Texturizing is an important step that adds natural fiber feel to synthetic yarns by introducing bulk and crimp.  Traditionally, these properties were measured using Skein method, which by design, can only measure skeins of yarn at a time.


The introduction of the yarns with different crimp levels into the same fabric will cause light to reflect differently, creating a stripy appearance due to variations in bulk.  When measuring the Crimp and Shrinkage, TYT-E can apply as low as 1mg/denier tension on the yarn to measure the slightest change in crimp and shrinkage.


Lawson Hemphill developed the Textured Yarn Tester with Electronic Servo Drive , TYT-E, to overcome the disadvantages of the Skein Method by reducing test time (1000+ pkgs/8hours with a Package Changer).  TYT-E also has an exclusive ASTM Standard D6774, “Standard Test method for Crimp and Shrinkage Properties for Textured Yarns using a Dynamic Textured Yarn Tester” and it conforms to the Chinese Standard GB/T6508-2001.


TYT-E provides a dynamic platform that allows measuring every section of the yarn to simultaneously determine four yarn properties, including Total Recovery (Total Contraction), Fiber Shrinkage, Fiber Crimp and Entanglement.


In addition to providing direct feedback on yarn quality during production, TYT-E can be placed directly in the yarn packaging area to qualify outgoing packages before final shipment.


Windows based TYT-E software program features user-friendly touchscreen interface and it provides complete statistical report with accept/reject limits and built-in ability to connect to a network to control the production parameters remotely.


LH-131 TYT-E



LH-122 FAK-S

The Lawson Hemphill FAK-Sampler, FAK-S is recognized as the worldwide standard for lab knitting machines. It is a high-speed, precision knitting machine designed to check uniformity and consistency of the yarn quickly and accurately. It is ideal for use in production control and R&D labs as well as dyeing plants.

In any knitting application, the yarn tension and the yarn feed controls are critical to ensure fabric uniformity. Any changes in these variables during knitting will cause irregularities, creating a defective fabric. The FAK-S has a built-in Stitch Control System, which ensures the preparation of the standard samples of knit fabric for yarn quality control purposes. The machine also features a take-up assembly to collect the fabric under controlled tension to further ensure fabric uniformity.

The FAK-S can knit all types of yarns, including synthetic and natural fibers as well as monofilament, filament, elastomeric and spun yarns. Nine different cylinder sizes are available to knit yarns from 10d up to 2000d. All knitting cylinders are interchangeable and can be used with all Lawson Hemphill knitters. (Please consult Lawson Hemphill for knitting higher or lower denier yarns).

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  • Precision lab knitting machine with Stitch Control System to prepare standard samples of knit fabric for quality control purposes

  • Ability to knit all types of yarns, including synthetic and natural fibers as well as monofilament, filament, elastomeric and spun yarns

  • The only sample knitting machine trusted with spectrophotometer for color and dye analysis

  • Maintains constant course length with the Yarn Meterhead to ensure uniform loop size

  • Maintains constant tension on the yarn with the Air Servo/Stitch Cam Regulator to eliminate fabric defects such as barre, which is caused by tension variation during knitting

  • Features fabric take-up assembly to collect the fabric under controlled tension to ensure fabric uniformity

  • Nine different cylinder sizes available to knit yarns from 10d up to 2000d (Please consult us for higher or lower denier ranges.)

  • Interchangeable knitting cylinders that can be used in all Lawson Hemphill knitting machines


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The Dynamic Modulus Tester is a complete system that measures Sonic Velocity through materials. Physical properties derived from sonic velocity include modulus of elasticity, material anisotropy, molecular orientation in fibers and films as well as orientation of fibers in a web.


LH-551, LH-552 DMT
  • Digital display of the transit time through material

  • User friendly software program that calculates the sonic velocity automatically

  • Fiber Scanner option for yarn and Planar Mount option for sheet material testing



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LH-610 FST

FST, Force Shrinkage Tester measures the Shrinkage % and Shrinkage Force on the yarn simultaneously. The system is a closed unit, which maintains a controlled atmosphere as the test is progressing.

The system uses a high temperature heater to measure in Shrinkage % and Shrinkage Force. The heaters can be individually programmed up to 300˚C to run tests independent of each other. (Optional High Temp Heaters up to 450˚C).

The FST is equipped with 2 clamps. Different clamp designs are available to accommodate yarn types from tire cords to elastomeric yarns.

The standard load cell is 200g. Also available are load cells from 10g to 2000 g, depending on the yarn type to be tested.

FST Software automates all calculations for Shrinkage Force and Shrinkage % based on temperature and time parameters. In addition, built in temperature ramp feature allows the user to test the yarn against increasing temperature levels. This feature allows the operator to predict optimum temperature settings for run ability of individual yarns packages.

The test process is automated. A yarn sample is clamped and the test button is activated. Automatically the yarn is inserted into the closed heater chamber for testing. The software plots the shrinkage % or shrinkage force data in real time. Statistical analysis is made at the end of each test.

  • Automated testing system for simultaneous measurement of Shrinkage % and Shrinkage Force of the yarn

  • Complies with ASTM D4974, ASTM D5591, EN 13844

  • Enclosed system that maintains a draft-free environment during test

  • Dual, non-contact heaters individually programmable to run tests under constant or temperature ramp mode with 5 settings from ambient to 300˚C (Optional High Temp Heaters up to 450˚C)

  • 10g, 200g or 2000g load cell available to meet the required force measurement precision

  • Light duty or heavy duty clamp designs available to provide non-slip grip for different yarn types from elastomeric yarns to tire cords

  • Friction free pulley to measure the Shrinkage % with ± 0.1% precision

  • Five programmable temperature settings allow temperature ramp and soak interval

  • Windows based, easy-to-use software features

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