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Tension test methods

Animation of the tension method

Tension methods pull or stretch the test sample, to measure the elasticity and the ultimate strength of the product. This is a less common, but valuable procedure for testing food itself, but has relevance in the simulation of production processes and the handling of the final product. As such, the texture analysis system set up for a tension method is often used in determining packaging recommendations.

See FTC's tension test method capabilities.

Test procedures

The texture analyzer may pull the sample apart by moving the crosshead upwards, or the fixtures may enable tension in the product, even when using the system in compression, by punching through in a slow, controlled manner.

Products such a stick chewing gum, restructured deli meats and cheeses, can be successfully tested for their elasticity with tensile testing by pulling apart. The burst strength of thin products (e.g. tortillas) are tested for by extensibility - slowly stretching the structure with a round probe (until tear and penetration). Product stickiness, adhesion, can measured by the tensile adhesive force exerted as a probe moves back upwards after initially compressing the sample. Dough stickiness is tested with a bakery-specific fixture, and is useful for texture analysis relating to influencers of the kneading process (by hand or machine).

In most cases it is quite difficult, if not impossible, to consistently grip a food sample during a tension test without causing a false failure point. This may be overcome by forming the samples into a “dog bone” shape so that the cross sectional area in the center of the sample, is smaller than that in the region being gripped. This ensures that the deformation and failure are consistent from sample to sample and accurately representative of the material - not influenced by the test system.

FTC offers several tensile grip designs to accommodate test samples in elasticity, strength and extensibility applications.

Tension testing fixtures

Tension test methodsTension test results measuring strength of a torillaTension applications in food industries

Trusted by customers across the world

As a seasonal vegetable processor, understanding crop maturity and the accuracy of this measurement is key to staying ahead of crop and knowing when to make the move from value to premium product as harvest time constraints permit.

The TU units provided by FTC give us the accuracy to work to much tighter tolerances, replacing older less accurate analogue equipment which in turn can affect final product grading and profitability.

The units are well designed, very low maintenance and are backed up with a strong support service which will allow them to provide many years of accurate, reliable service.

Colven Wilson
Technical Manager
http://www.eyefreeze.co.uk/

Our experience with FTC has been more than satisfactory, not only for the quality of the equipment you’ve got but for the post selling service that has proved to be excellent.

Any problem that we had, it took nothing more than a simple mail or phone call to have your immediate answer. We want to thank you very much for the quality of service provided.

 

 

Gonzalo Moraes, Arrozur S.A. Montevideo – Uruguay

My first contact with FTC was through buying texture analyzer equipment as my area of interest is Rheology. We faced a problem operating the appliance. The company tried hard to help us through the internet, but the University thought it was better to send me to the company branch located in England. I received a highly advanced training course for 10 days free of charge. They provided me with programs that operate the equipment along with the information needed.

It was a great effort and outstanding support. I would like to thank Shirl Lakeway and FTC for providing me with this opportunity and for his continuous help. Finally, I encourage researchers who are interested in the physical properties of foods and dairy to choose FTC as it is a respectable and dependable company and offers the best deals concerning prices and training with different languages, such as Arabic for the Middle East.

Professor Hoda El-Zeini, Dairy Science and Agriculture University - Cairo, Egypt
Professor
https://cu.edu.eg