Industrial Manufacturing News

The textile burst tester is designed to meet international standards for tests on textiles. In textiles, the burst tester measures the fabrics strength along with immediate or eventual effects of dyes, chemicals and processes. It also demonstrates the results of wear, age and environment and evaluates the comparative strength of alternative fibers.

The instrument is designed for measuring the bursting strength of sample materials subjected to an increasing hydrostatic pressure. This pressure is applied to a circular region of the specimen via an elastic diaphragm. The specimen is firmly held round the edge of this circular region by a pneumatic clamping device. When the pressure is applied, the specimen deforms together with the diaphragm. The bursting strength corresponds to the maximum pressure supported by the specimen before failure.

Identical, in the principle to a multi-directional tensile test, this measurement is independent from the cutting direction of the sample (machine or cross) since the failure naturally occurs in the least resistance direction. The rubber diaphragms with specific thickness and shore hardness must have a bulge versus pressure pattern within the tolerance of the standards related to the type of material tested.

Pressure system:
The hydrostatic pressure is transmitted to the diaphragm by a hydraulic jack associated with a frictionless ball-screw driven by a precision DC motor. The rotational speed and the position of the motor are servo-controlled by means of an optical encoder ensuring a perfect control of the fluid flow rate together with the determination of the displaced volume of fluid.

Note: This measurement may be used to determine the profile of the resistance pressure of the rubber diaphragm itself versus the displaced volume of fluid. The corresponding values may then be subtracted from the values actually measured during a test in order to take into account the sample resistance only. (Applications to textiles for instance).

Sample tightening system:
• A large pneumatic jack enables an accurate and reproducible tightening.
• The tightening surfaces have an adequate profile to minimize the slippage even for difficult materials like textiles for high volume bags.
• The tightening pressure is measured with a precision manometer and may be displayed in metric or imperial units.
• The gripping strength is recalculated according to the geometry of the tightening surfaces, and displayed in newtons.

Bursting pressure measurement:
• The pressure is measure by a metallic gages pressure transducer (0 to 100 bars)
• Accuracy: +/-1% of read value +/-1 digit between 5% and 100% of the FSD.
• Resolution: 2 mbars (50,000 points)

Some important features of this tester include:
• Large graphic LCD
• Software available for easy data transfer to Excel and other spreadsheets
• Pneumatic sample clamping
• Menus allow programming to meet pre-defined test methods and international standards.
• Predefined test methods may be stored and recalled

Ideal for the assessment of mechanical resistance to aggressions (shocks, penetration,) the bursting test also called "Mullen test" is widely used in the textile industry. This includes applications in textiles, linens, industrial fabrics, home goods, upholstery, non-woven's and outdoor coverings and materials. Meets ISO/CD 2758, ISO/CD 2759, ISO 2960, ASTM D774 and NF.G 07112.

About Lawson-Hemphill
Lawson-Hemphill is recognized worldwide as an industry leader in supplying innovative solutions to textile quality assurance. To every corner of the world, Lawson-Hemphill is providing testing equipment as well as turnkey quality control systems to new and expanding manufacturing facilities, from global giants to specialty producers.

In October 2005, Lawson Hemphill became a member of the TMI Group of Companies. This exciting event significantly strengthens Lawson-Hemphill's ability to serve our global customer base with our new offices in Canada, The United Kingdom, The Netherlands and France. For more information on Testing Machines Inc please visit our website at www.testingmachines.com

For more information contact:
Worldwide Headquarters:
Lawson-Hemphill
1658 G A R Highway
Swansea, MA 02777 USA
Phone: 508 679-5364
Fax: 508 679-5396