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Capability Statements

Plastic extruded medical tubing is an essential health care product for the delivery of blood, nutrients and gases to the patient, and for the execution of minimally invasive surgical procedures. The tubes, for example catheters, may also be connected to other medical apparatus such as Luer devices, butterfly valves and pipe junctions. A manufacturer of these products must meet strict regulatory compliance in conjunction with optimising the functional design - for efficiency plus patient comfort and safety - while also meeting production costs. An in-house quality testing regime should consider the in-service forces exerted on the individual components and the complete system of which the tubing will be a part. The tubing itself can be tested for tensile strength and elongation behaviour with a force test stand and a selection of appropriate grips and fixtures pertinent to the product’s performance requirements in situ. A computer-controlled system is perfect for an OEM’s research and development lab, allowing the collection of results and bespoke test programs applicable to a range of products. The challenges to reduce the wall thickness to minimise trauma and maximise the lumen bore to maintain flow capacity can be met with structured, repeatable quality testing processes.

Mecmesin Systems: MultiTest computer-controlled force test system, 5 kN wedge grips, bollard grips
White Paper: Force Testing Medical Tubing

The effective sealing of food items with plastic film relies on a degree of flexibility and strain within the film in order to enclose and achieve air-tight packaging. A two-layer construction, with the outer layer bearing the printed product information, may be quality verified for integrity by a tensile strength test. The packaging material should exhibit a degree of elasticity, but still meet expected levels of tensile strength before breakage. Spring-loaded roller grips hold the sample securely without slipping or damaging the thin material. A motorised force test stand with a digital force gauge and software provides a repeatable solution for measuring the peak force to break apart the plastic layers under constant speed loading. This compact system is ideal for the quality control or research laboratory.

Mecmesin Systems: MultiTest 2.5-dV motorised test stand with gauge and software, spring-loaded roller grip
Case Study: Plastic Film Tension Test

In the biomedical engineering industry, the reliable performance of surgical sutures is vital to wound healing and hence the wellbeing and recovery of the patient. Differences in gauge and material constructs (e.g. hybrid metal wire/polymer yarn, or other specialist textiles) are required for different purposes, with functional requirements such as being absorbable/non-absorbable or antimicrobial also affecting the physical qualities of the thread. The measurement of the strand’s elongation at break and the force required to snap the thread provides an objective and comparable method of evaluating these advances in medical technology. To successfully test the ultimate tensile strength of the fibre, it must be ensured that the grips securely hold the sample, whilst being light enough to allow the use of a loadcell with the optimum accuracy for the force range. Any slippage will compromise the precise measurement of the elongation, which may be a critical parameter in the back-to-back comparison of alternative constructs. The use of a computer-controlled force test stand with specific fixtures allows healthcare product OEMs to optimise the design of medical textiles for effective healing and minimal cosmetic impact.

Mecmesin Systems: MultiTest computer-controlled test system,

The functional attachments of transit packaging products: handles, locks, latches, hasps and clips, etc. are essential to the operation of the container. In the case of a military implementation – such as an ammunition case – it is imperative that these components perform as intended. The non-destructive testing of every production item for such a critical article, would also require a system that can hold the container securely yet allow swift change-over time between tests. In order to test both the handle and hasp of the locking mechanism for resistance to pull-off forces or material failure under tensile load, large and robust custom fixtures are required to grip the unusually-shaped features of the case. A console-operated test stand is suitable for a production environment, with the test programs able be run from a touch-screen icon to then apply the required load value for each element.

Mecmesin Systems: MultiTest touch-screen test system,

Product safety in the construction industry is critical and test standards are in place to ensure that the protection of workers is maintained. Safety nets, specifically, are used for arresting falls from scaffold systems and also for protection from falling debris. A supplier of these products must adhere to strict quality processes as the nets are returned, repaired and tested for tensile strength, against the manufacturer’s criteria for withdrawal, and industry standards. Age, wear and tear, and UV degradation all contribute to the reduction in the strength of nets over time. The use of bollard grips, designed for the retention of samples of the nature of rope, cord, string, fibre, yarn, thread or tape, provides secure clamping of the individual net cell whilst minimising the risk of “jaw break”. Performing these tests at an in-house facility means that nets are set aside for assessment for the least time, those nearing minimal compliance can be monitored, and all those meeting standards have an immediate certification. Additionally, test control software provides consistent speed, force and displacement, acquires detailed data for analysis, and shows an instant pass/fail indication.

Mecmesin Systems: MultiTest motorised test system,large circular bollard grips,Emperor™ (Force)
Case Study: Construction safety netting certification testing

The use of paper and cardboard consumer packaging has many advantages in terms of lightness, cost and recycling possibilities. A supplier of beverage carriers, would need to ensure that the production processes are able to manufacture these containers to a quality level which will maintain their shape and functionality whilst in service. Typically, cardboard beverage carriers are manufactured flat and opened out whilst moving along the production line. During the process, the glue must set, excess glue must not create unwanted adhesions, and the unfolding must not detach or weaken glued seams. Quality assurance of the carrier's integrity to the required point of glue setting, requires tensile testing at forces applied by both production machinery and manual end users. To test the opening of the cardboard carrier it may be required to design a bespoke fixture to handle the lightweight material in the same manner as an end-user application. In this example, the automated test stand employs a vacuum fixture to lift one side of the container to a maximum load while the opposite side is clamped firmly in position.

Mecmesin Systems: MultiTest motorised test system
Case Study: Glued cardboard packaging integrity
Video: Tensile test on beverage carrier packaging

The effort required to open and to close car doors is variable throughout their travel, and is optimised for the anticipated strength of a wide range of users. The tensile force measurement in situ is difficult due to the typical confines of a vehicle interior. With such a wide variety of designs of interior cabins in the automotive sector, a portable and customised system may be needed to measure and store the changing forces during opening and closing, for a range of vehicles. A force gauge and loadcell for allowing storage of detailed and accurate measurements for subsequent analysis would need to be connected through a bespoke system design, connected to the interior arm-rest, which will facilitate the application of a preloading tension.

Mecmesin Systems: Advanced Force and Torque Indicator, S-Beam loadcells
Case Study: Car Door Closing Energy Tester

Surgical needles and lancets may be located in their hub or ferrule by a variety of methods, including bonding, moulding, welding, mechanical interlocking, and sealing. The retention, or pull-off strength of the assembly method must be sufficiently high that the peak frictional force during usage does not cause disassembly or seal failure resulting in the needle remaining in the patient. To test the pull-off/pull-out performance, the test system is normally fitted with a suitable mounting block, to support the hub in such a way as to leave the needle tip exposed vertically. In the case of smaller needles and lancets, a lever-operated pin vice may be used to grasp the tip, and for larger gauge needles, a wedge grip may be required to hold the sample. An axial tensile load is applied at a constant rate, until the needle is completely dislodged from the hub. For safety considerations, the test system should be contained in a protective enclosure to provide protection from the fracture and breakage of sharp objects.

Mecmesin Systems: MultiTest motorised test system, digital force gauges, manual test stands
Case Study: Lancet needle retention test,needle pull-out test
White Paper: An Examination Of Needle And Syringe Force Testing

Automotive safety-critical systems, such as welds in vehicle airbag connectors, require rigorous testing for zero defects. Pull-off and pull-out testing to destruction at a constant and consistent speed and with complete repeatability enables maximum conformity to quality control standards. To enable the testing to be performed by production staff on the factory floor, special customised quick-release fixtures, enabling batches of test samples to be changed very simply for maximum throughput, enhance the suitability of this solution for automotive assembly applications. Data output is easily achieved from digital gauges for transmission to the organisation’s Statistical Process Control (SPC) software.

Mecmesin Systems: MultiTest motorised test system, digital force gauge
Case Study: Safety-critical welds in vehicle airbags

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

Animal identification tags are important for both legal and health & safety reasons where animal by-products are sold into the human food chain. The tags on dairy cattle are used to record data and trace the animals throughout the milk production process. The tags themselves, attached through the livestock’s ear, comprise two flexible plastic leaves and a tamper-proof pin fastener. They must remain on the animal – and complete in themselves – when subjected to all expected in-service forces. Specific standards require testing for both tensile strength (by means of a transverse pull test) and pull-off/pull-out forces along the axis of the pin. The software–contolled test stand is able to hold the tags at a target load and then pull further at contolled speed (typically 500mm/min) until breakage. Once failure occurs, the tags must be unusable as part of the traceability requirements. The transverse pull test can be performed with suitably rated tension wedge grips. The pull-out test on the pin can be achieved with custom grips designed to pull axially and support the leaf surfaces.

Mecmesin Systems: MultiTest console-controlled force test system, 5 kN wedge grips
Case Study: Animal Identification Tags

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A Brand You Can Trust

"The MultiTest 0.5-i is a very good and reliable machine and the Emperor™ Software brings great advantages. It’s a very useful tool for these kinds of tests. It’s fully programmable and offers an in-depth analysis of results. It’s a precious tool for everybody involved, especially those who work with plastics and their mechanical performance"

Nikos Michopoulos, Quality Control, Eurofilm Mantzaris S.A.


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