Source: Link Testing Instruments co.,ltd
Casing, sausage casing, or sausage skin is the material that encloses the filling of a sausage. Usually, there are two kinds of casing - natural casing (Hog Casings, Sheep Casings, and Beef Casings) and artificial casing. PVDC (Polyvinylidene chloride) film is one common material used as artificial sausage casing.
Tear strength is one of key properties that may influence the manufacturing process and user’s experience. To be specific, the lower of tear strength of PVDC film, the higher risk that the casing is broken during sausage producing and transportation. In contrast, if the tear strength of PVDC film is too high, it will be cased consumers very difficult to open it, even caused the contents Spill or scattered.
The main test methods for tear strength of flexible packaging materials and paper includes right angle type method, trouser-type method and Elmendorf type method, etc.
Right-Angle Tear Test - The force to tear the right angle cut
Trouser Tear and Elmendorf Tear – the force to tear along the cut
图表 1 Elmendorf Tear
图表 2 Trouser Tear
LTLD-1000 Elmendorf Tearing Tester, which is developed and manufactured by Link Testing
Figure 1 LTLD-1000 Elmendorf Tearing Tester
test specimens PVDC sausage casings are all manufactured by a local manufacturer.
The pendulum is lifted up to a certain height to give it an initial potential energy. The pendulum tears the specimen while swinging down. Computer calculates the decreased energy caused by tearing to obtain the required force for tearing.
Pendulum capacity includes 200gf, 400gf, 800gf, 1600gf, 3200gf and 6400gf, which can be selected according the specimens. Computer assisted horizontal adjustment system could maintain the instrument optimum status. Support Lystem lab Data Sharing System for Uniform data management.
|Specimen #||Tear Strength (gf)|
The average tear force along the machine direction is 30.857gf
We used Elmendorf test method to measure the sausage casings tear strength of machine directions. The test procedure is simple and the equipment LTLD-1000 tear tester is also easy-to–used. Pneumatic specimen clamping and automatic release of pendulum avoid the system error effectively and improve the test accuracy.
Link Testing is a professional high-tech company with core businesses including the R&D of laboratory testing instruments, packaging testing and test data processing services. We are dedicated to providing integrated professional quality control solutions for packaging manufacturers, food and beverage producers, medical and pharmaceutical companies, and daily chemical and printing industries.www.linktesting.org