Tendring Pacific

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Microprocessor controlled Mullen type Bursting Strength Tester. Complies with ISO 2758 for the testing of papers, film + foils. Pneumatic clamping of test sample. User programmable test methods.

Burst Testers are used as a multi-directional tensile test to identify failure in the direction of least resistance for evaluating physical strength and fiber bond.

Models are available to test a variety of materials. These models can also be fitted with a device to measure the deflection of the sample prior to burst.

The Burst tester is designed to meet international standards for tests on paper, foils, paper boards, corrugated board, textiles etc.

Operation
The Burst Tester is designed for measuring the bursting strength of fabric 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 the multi-directional tensile test, Ball Burst Method for Fabrics, 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.

Applications

• Textiles, Fibers, Non-woven”s, Polyester, Fabrics, Felts etc.
• Strength, stiffness, dye ability, resilience, fatigue elasticity, orientation and crystallinity.

Standards
ISO 2758, ISO 2759, ISO 1328-2:1999, ISO 2960, ASTM D 3786 , ASTM D-774, BS 4768,

Specifications

• Paper and Foil Standards- ISO 2758
• Corrugated- ISO 2759
• Textile Standards- NF G.07112, ASTM D 774

Features

• The clamping pressure is measured with a pressure transducer and displayed in bar/PSI
• Software to transfer data to Excel: Testlink3
• Pneumatic sample clamping
• Date of last calibration stored in memory (clamp pressure, bursting pressure, and height gauge)
• Menus allow programming to meet pre- defined test methods and international standards
• Number of test performed with diaphragm stored in memory

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.

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)

Instrument sizes

• Depth: 565 mm (22.25 in.)
• Height: 495 mm (19.5 in.)
• Width: 517 mm (20.35 in)
• Weight: 65 kg (143.3 lb)

Connections

• Electrical: Specify voltage requirements when ordering
• Air: (instrument quality) 600 kPa (6 bars)

Ordering information

Consumables

• Mullen Burst Tester Standardised Aluminium Foils

For more information
Contact our sales team on 01223 492083 or via sales@tendringpacific.com