83-20 Textile Tear Tester

INTRODUCTION

Tear testing measures the force required to continue the tearing of initial cut in sheet materials. Models and weights are available to test material with a variety of strengths. This is also useful to evaluate strength of perforated materials such as reply cards.

Also known as the Elmendorf test, the tearing test has been performed in the paper industry for more than half century in order to measure the mean internal resistance of cellulose or papers to the propagation of a deliberately initiated tear. It enables rapid determination of the dynamic resistance of materials designed to be subjected to strong shearing loads(e.g. newspaper) or liable to be damaged by sharp or heavy objects (e.g. paper bags). Subsequently, the test was naturally adopted for all materials in the form of sheet or films, cardboards, cloth, knitted fabrics, plastic films, aluminum foil, non-woven fabrics, complex flexible packaging etc. for which the service requirements are similar to those for paper.

OPERATION

The test is carried out on a specimen composed of one or more sheets of standard dimensions, usually with a distance of 43mm (1.7 in) remaining to be torn after initiating the tear. The energy of a pendulum of suitable weight is used to completely tear the specimen. The difference in the angle from the vertical of the center of gravity of the pendulum between the downswing and upswing is a measure of the energy absorbed in tearing the sample. This angular movement is measured with a digital encoder and is immediately converted to the mean tearing force for a single sheet by the microprocessor incorporated in the apparatus

APPLICATIONS

Textiles, Fabrics, Strength materials etc

ADVANTAGES

Auto specimen notching
Safety Hood
Automatic pendulum reset with lifting device
Tearing force displayed digitally
RS-232 data output
Mechanical-pneumatic clamping avoids sample slippage to ensure repeatable results

SPECIFICATIONS

NF G.07.149
ASTM D 1424: Standard Test Method for Tearing Strength of Fabrics by Falling Pendulum Type (Elmendorf ) Apparatus
M&S P-29: Marks and Spencer P29:2001 Tear Strength
ISO 13937-1: Textiles. Tear properties of fabrics: Determination of tear force using ballistic pendulum method (Elmendorf )

FEATURES

Repeatability: The mechanical-pneumatic specimen gripping system guarantees sufficient clamping pressure to avoid all slipping phenomena, thus ensuring perfect reproducibility of the experimental conditions.
Safety Hood: As soon as the safety hood preventing access of the operator to the swinging pendulum zone is closed, the specimen is pre-notched automatically by a pneumatically driven shear.
User-friendliness: The mean tearing force is indicated on an easy to read alphanumerical liquid crystal display and can also be transferred to a computer, either for additional statistical treatment or for record keeping purposes.
Ergonomics: When the apparatus is equipped with an automatic pendulum raising device, after each test, the pendulum is immediately reset in its starting position.

TECHNICAL CHARACTERISTICS

Specifications	83-20	83-21
Capacities	0-6400 grams	0-10,000 grams
Pendulum Range	400, 800, 1600, 3200, 6400	5000, 10,000
Measureing Range	0-100 N for Textiles	0-100 N for Textiles
Accuracy	1% of pendulum range	1% of pendulum range
Computer assisted calibration software & set of weights and accessories	Option	Option
Weights for routine inspection	Option	Option
Automatic pendulum reset	Standard	Standard
Automatic specimen notching	Standard	Standard
Safety Hood	Standard	Standard
Automatic weights recognition	Standard	Standard
Specimen preparation tools supplied with the apparatus	Shear (papers)or punch (plastic films)	Standard punch for use with a hammer or a press
Computer or printer output	RS 232C
Number of sheet selector	Standard
Pneumatic grips	Standard
Measurement and display of the blank upswing angle (zero)	Standard
Software for PC	Test link 3

INSTRUMENT SIZE

	Depth:		500 mm (19.7 in.)
	Height:		500 mm (19.7 in.)
	Width:		540 mm (21.3 in)
	Weight		52 kg (115 lb.)

CONNECTIONS

Compressed Air: 600 kPa (90 psi) -700 kPa
Electrical: Specify voltage requirements when ordering

ORDERING INFORMATION

The models 83-20 and 83-21 offer a combination of technological integration and user comfort unique to this type of instrument.

Model 83-20-00 is designed for tests on paper, aluminum, plastic films, complex flexible packaging, non-woven fabrics and others low strength materials
Model 83-21-00 is designed for testing cardboard, natural or synthetic fabrics, coated fabrics and other medium strength materials.

Call Us Today

For additional information on TMI Products and Services, or to learn how Testing Machines can help your company profit through testing, please call us at 1-800-678-3221, or e-mail info@testingmachines.com.

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Textile Tear Tester