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Tear - Capability Statements

Fabric trouser tear test

Fabric tensile strength and tear characteristics

Textiles, cloths and fabrics used in both clothing and sporting markets have requirements for flexibility and lightness, but also durability and resistance to breakage – particularly tear damage – when in use. A hot air balloon manufacturer must conform to strict standards, applicable to the aerospace industry despite the textile construction of the product. The variation in coatings for the fabric – due to individual designs – and the fabric itself, requires that the test procedure must be applicable all cases. The strip method tear test for fabrics evaluates tear propagation resistance under constant loading at a constant rate of displacement. For secure retention of the standard size samples, wave-form jawed grips would be suitable, capable of holding the fabric across its full width, up to forces of up to a peak of 350 N, in this case. This tear test may be used as a standard method for measuring the effect, not only of wear-and-tear on the textile, but the impact of sunlight aging the material over time. The same system of a motorised test stand, digital force gauge and results analysis software, plus the versatile grips can also be used to measure the tensile strength of the numerous seams and fastenings of the fabric structure.

Mecmesin Systems: Motorised stand with gauge and software, large vice grip

Case Study: Balloon Cloth Tensile Strength Test

Sachet tear test

Sachet tear testing

Sachets are convenient forms of packaging, as they are easy and quick to open and the ideal size for delivering small quantities or trial sizes of products.  They are used as packaging for products from industries such as cosmetics and pharmaceuticals as well as food products such as condiments.    Manufacturers need to ensure that their sachet packaging is strong enough to protect the contents through all stages of the manufacturing and distribution process, while remaining easy to open for the consumer. Tests carried out to ensure the integrity of the sachets include tear strength and tear resistance.  These tests measure the strength of the material where it is intended to tear, e.g. along a seal or perforation and demonstrates the quality of the sachet to provide a barrier protecting the product from the external environment.  Tear testing methods set standard conditions under which a material sample can be treated in a repeatable way.
Mecmesin Systems:Tear resistance test systems

 

Geotextile strength testing ensures in-service performance quality

Geotextile in-service performance testing

Geotextiles undergo a range of forces in their intended applications and determination of their suitability for in-service conditions involves a number of test types. The variety of materials utilised—both synthetic polymer and natural—and method and construction—woven, knitted or non-woven—means that quality testing requires consideration of the sample gripping, manner of deformation and loading capacity. Mecmesin has a range of force testing systems from mid-capacity single column configurations up to 50 kN twin column UTMs. A geotextile fabric may undergo forces which could stretch, tear, puncture or penetrate the membrane and an appropriate replication of the relevant loading is essential to quantify the performance of the textile in its environment. Typical international standards targeting these test types include: ASTM D4533, trapezoid tearing strength of geotextiles; ASTM D6241, static puncture strength of geotextiles and geotextile-related products; ASTM D4632, grab breaking load and elongation of geotextiles.

 
Medical textiles need to meet strength checks and other hygiene requirements

Medical textiles and fabrics testing

Medical textiles reach their end user in both yarn or fabric forms, necessitating a specific test in order to evaluate the quality of the product for its intended purpose. The materials themselves must meet stringent requirements over and above their physical properties such and strength and flexibility—relating to hygiene and resistance to infection, or the need to be non-reactive in the case of implantable textiles. Individual yarns (for example suture thread) should be tested for ultimate tensile strength, to minimise uncontrolled breakage, but facilitate breakage or cutting when required by the surgeon. Motorised test stands fitted with roller or bollard grips ensure reliable measurement of truly representative sample breakage, away from fixture clamping. Clothing and other protective garments must be evaluated for tear, peel and puncture/penetration resistance as well as ultimate strength and elongation properties. Mecmesin’s universal testers and dedicated peel and tear test systems can accurately measure the performance of medical fabrics to international standards against Delft, tongue, single rip (trouser), trapezoidal and Graves tear procedures. Computer controlled systems enable specific in-house tests to also be performed. Some fabrics may also require a degree of penetration resistance which is easily evaluated by our UTM systems. Patient dressings must be flexible enough to cover any part of the body and also protect and support many types of injury, thus the measurement of elongation and ultimate tensile strength enables the manufacturer to quantify the performance of the textile completely.