QUALITY CONTROL FOR TECHNICAL TEXTILESFILIZ AVSAR

LAWSON-HEMPHILL (USA)LAWSON - HEMPHILLLAWSON - HEMPHILL

Smart Quality ControlSmart Quality Control

Aramid. Reg.

MEDICAL TEXTILES

Yarn Crimp Measurement for Vascular Grafts

Friction & Diameter Measurements for Sutures

Comfort Factor & Draw Force Measurement

Medical Textiles cover a broad group of technical textiles.

Test methods for medical textiles include:

4. Shrinkage % and Shrinkage Force Measurements

1. Crimp Measurements for Vascular Grafts2. Friction & Diameter Measurements for Sutures3. Comfort Factor Measurement for Elastic yarns

TRANSPORTATION TEXTILES INDUSTRIAL AND GEOTEXTILES

Shrinkage Force and Shrinkage % Measurement

Yarn Evenness & Entanglement Measurement

Dyeshade Variation and Streak Checks

Evenness Measurement for Yarns in Composites

Draw Force Testing Synthetic Yarns

Contact information

LAWSON-HEMPHILL1658 GAR Highway, Unit 6Swansea, MA 02720-USA

Tel: + 1 508 679 5364Fax:+ 1 508 679 5396 www.testingmachines.com

Lawson-Hemphill is a TMI Group Company.

www.lawsonhemphill.com

This group is used in composites, reinforcement in printedcircuit boards as well as filters, building materials, soilcontainment, embankment supports, etc.

Glassfibers and Carbon-Glass hybrids are used in makingcircuit boards and car parts such as gears. Evenness andbroken filaments are issues with these types of yarns.

Mechanical response of a geotextile depends on theorientation and regularity of the fibers.

Vegetable Fibers such as flax and sisal have this propertynaturally. Synthetic yarns need to drawn and heatset.

Higher draw force values > more crystalline regionsLower draw force values > more amorphous regions

POY PES Draw Force Results

PROTECTIVE TEXTILES

Measurement of Wave Propagation

Protective Textiles, especially the ones used in ballisticprevention need to stop the incoming projectile flight atthe shortest distance possible. This requires extractingthe maximum kinetic energy from the projectile.

Absorption of this energy is related to wave propagationand frictional energy dissipation.

Velocity of the wave propagation, c is related to materialdensity and Young’s Modulus.

Velocity of the propagation for Aramids is ~8km/secVelocity of the propagation for Nylon is ~2km/sec

Up to 4 times the volume of the Aramid fiber can beinvolved in the wave propagation and energy dissipation.

Textured Yarn Tester

Artificial heart valve

0.22Suture 8

0.17Suture 7

0.19Suture 6

0.15Suture 4

0.18Suture 4

0.20Suture 3

0.19Suture 2

0.18Suture 1

CTT COF

0.22Suture 8

0.17Suture 7

0.19Suture 6

0.15Suture 4

0.18Suture 4

0.20Suture 3

0.19Suture 2

0.18Suture 1

CTT COF

CTT

Dynamic Modulus Tester

Air textured yarns Entangled yarn

Steel Wire (c=5.06km/sec) Paraaramid (c=7.23km/sec)

UHMPE (c=7.59km/sec) Nylon Tirecord (c=3.63km/sec)

Transportation industry is the largest user of the technicaltextiles. Car seats, tires, seatbelts, helicopter rotorblades, parts of a spacecraft are some examples.

Many different fibers are used in this field. For example,carbon-glass hybrid yarn is used for making light weightgears and air textured yarns will be used for car interiors.

Entangled yarns and Air Textured yarns are commonlyused in car interiors.

AirTextured Yarn and measure Entanglement/meter.

Lawson-Hemphill CCD Camerasystem can detect the diameter uniformity of the

High Modulus and Low Shrinkage PES yarns are used inthe tirecords. Aramids offer high strength and hightemperature resistance and they are used in airplane tiresand performance cars.

Car Interiors are the biggestuser of the technical textilesand the yarns that are used forthem need to be checked fordyeshade variation & streaks.

Lawson-Hemphill knittingmachine FAK-S is the only labknitting machine with fullyautomatic stitch control, whicheliminates tension variationduring knitting.

Force & Shrinkage % Tester

Hot Draw Force TesterCTT-E