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Consumer Packaging - Capability Statements

Blister pack 135 degree peel tester

Blister package for gels 135 degree peel test

The foil lid of blister packaging must allow separation in normal use by means of peeling the flexible layer from the formed container without tearing. The adhesive strength of the bond should facilitate this ease of opening and also guarantee the reliable sealing of the product within, which may be a liquid or gel with hygiene or sterility requirements in the pharmaceutical or food industries. Peel testing of these packages to external or internal standards has several challenges in order to replicate the actual manner in which the elements are separated in service and to repeatably focus the test of the adhesive characteristics of the bond itself. Maintaining the peel angle (initiated at 135 degrees) to within the desired specification may require the design of a custom fixture – a jointed chain can effectively replicate the manner in which a consumer will apply the tension to the lid. Grasping of the corner of the foil in a manner akin to human fingers will require suitably sized pinch grips. In order to focus the test on the bonding around the blister perimeter, the surface needs to be kept flat and in a non-deformed condition, to avoid introducing inaccuracies into the process and ensure repeatability. The use of a pneumatically-activated vacuum fixture specifically moulded to the blister profile is the reliable solution.

Mecmesin Systems: Touch screen force test systems, pinch grip

ROPP closure removal. breakaway and bridge torque tester

Roll On Pilfer Proof bottle closure breakaway, bridge and removal torque

The ROPP design of glass bottle cap is a popular solution for drinks manufacturers and brewers, featuring pilfer-proof indication by means of a tamper evident ring. The metal closure has a liner to ensure hermetic sealing to prevent leakage and preserve flavour, freshness and gas content of sparkling varieties. To quality assure the capping process is providing an application force and torque to achieve these objectives, whilst still achieving in-specification removal torque, a portable digital torque test instrument may be used at the point of production. An adjustable saddle plate and fixing pegs will allow a variety of shapes of bottle to be quickly accommodated and tested. For additional convenience, repeatability, and ease-of-use – important considerations in rapid through-put automated manufacturing environments – is an audible pass/fail indicator and the ability to connect the instrument to results analysis software and transfer stored data. The closure torque values typical for this solution mean that the simple application of removal torque by hand is possible, rotating the closure through the breakaway and bridge torque points, providing an efficient and representative test standard.

Mecmesin Systems: Tornado digital torque instrument, large saddle plate, adjustable fixing pegs

Case Study: ROPP bottle cap removal torque test

Champagne cork extractor and torque measurement system

Champagne and sparkling wine cork removal torque

The extraction of the cork closure from a glass bottle of Champagne, or similarly sealed sparkling wine, must be able to be performed easily enough to successfully release the beverage for consumption. As with all drinks containers, the stopper has to provide effective sealing to ensure the product remains in perfect condition, free from leakage (even after horizontal storage) and as freshly fizzy as when originally bottled. Additionally, the natural cork material should remain intact under the closure's removal torque required. A prime objective of a testing system to allow repeatable measurement of the peak release torque, suitable for a governing body responsible for evaluating the consistent quality of all products, is to reduce wastage in testing the full bottles of wine. A reliable quality assurance process needs several functional requirements. The ability to securely hold varying bottle sizes – magnum, standard (75cl) and demi – requires a design of fixture with quickly interchangeable jaws, able to grasp different radii and locate glass samples without slippage. Pneumatic operation of the clamps further enhances the efficiency of the method. The clamping of the cork within the upper fixture, must similarly be secure plus allow the cutting of the muselet wire prior to operating the test. The motorised system is geared to rotate the upper fixture as the bottle is simultaneously lowered at a constant speed. This complete, flexible, automated solution includes a safety enclosure to guard against spillage.

Mecmesin Systems: CombiCork-d, Advanced Force and Torque Indicator

COF testing of comsumer packaging

Packaging materials static and kinetic coefficient of friction (COF)

Mass production of goods often involves the transfer of items through the machines and transport mechanisms of the manufacturing process. Efficiency can be lost if the items misfeed or otherwise fail to move smoothly between operations. Consumer packaging used in the packing and shipping of products is affected by the frictional properties between the packaging material itself and the surfaces upon which it needs to slide. A specialist test solution to accurately measure the forces required to overcome the static and kinetic friction between the two surfaces enables the production organisation to evaluate different materials. Furthermore, this information then affords optimisation of machinery settings. A computer-controlled solution would involve a flat table upon which to locate the material sample, across which a block (‘sled’) of known mass is pulled by the test program. The force needed to initiate the movement is a function of the static friction (‘stiction’), the calculation of the average force to then maintain movement indicates the kinetic friction. The graphical output can also give an indication of the material’s propensity to cause judder or other undesirable characteristics.

Mecmesin Systems: Computer-controlled force test system, test hook

Case Study: Coefficient of Friction Test

Plastic film tension testing

Food containers and plastic film tensile strength

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. The challenge to securely hold the sample without slipping or damage the thin material is achieved with spring-loaded roller grips. A motorised force test stand with a digital force gauge and software is 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: M500E motorised test stand with gauge and software, spring-loaded roller grip

Case Study: Plastic Film Tension Test

Closure cap breakaway torque testing

Tamper-proof bottle cap bridge and removal torque testing

The seals on tamper-proof (or tamper-evident) closures are designed resist an unscrewing torque up to a specific value. The tamper-evident band on the cap should remain intact for safety reasons, until it is positively breached and the bottle opened for intended purpose. Testing of this bridge torque for a range of products is needed to optimise the balance between ease of opening and security. Testing the cap designs in isolation from the bottles themselves in a product design environment can be achieved through the use of bespoke mandrels in the standard manufactured sizes produced by the supplier. These fixtures ensure a repeatable grasp of the cap and a precise hold of the tamper-evident ring for confident back-to-back testing of design variants. A digital torque indicator gauge, with on-board memory - for storage of the peak torque - and data transfer capability allows the collection of results for analysis.

Mecmesin Systems: Advanced Force and Torque Indicator, torque mandrels

Case Study: Torque Tester for Dedicated Caps

Tamper band bridge tensile test

Bottle cap tamper-evident band bridge tensile strength and pull-off resistance

The tamper-evident caps on bottles are designed to resist breaching through unscrewing torque and/or pull-off force until opened for intended purpose. Correct opening requires unscrewing, with the option of resealing again for consumer convenience. The integrity of the tamper ring may also be tested against other removal forces experienced in transit or mishandling that would compromise the intended functionality. A peak force test to pull the cap (without rotation) until the tamper-proof band breaks away may be used to evaluate the design with respect to in-house standards. A console-operated system is convenient for production environments, with simple touch-screen operation to run a programmed test procedure. To augment throughput efficiency a custom-built fixture which allows one sample to be tested whilst another is loaded may be implemented. The cap is pushed over the fixture collar, manufactured to replicate the exact profile of the bottle neck. A concentrically-mounted compression probe is driven down through the sleeve, engaging inside the cap and compression-loading it until one or more of the tamper ring’s bridges fail. The recorded peak force reflects the overall tensile strength of the bridges and may be used to compare designs or supplier batches.

Mecmesin Systems: MultiTest console-controlled force test systemEmperor™ (Force)

Bottle stopper extraction pull-out testing

Bottle stopper extraction force

The bung used to stopper a beverage bottle must provide a leak-free seal to protect and preserve the liquid contents, whilst still allowing an ease-of-opening to access the contents. The removal process may involve a combination of pulling force and some rotational torque in practice, however to implement a repeatable quality assurance test, a standard method must employed. The axial force of extraction gives a consistent indication across different samples and provides greater simplicity of test procedure than mixing the pull-off/pull-out force and torque elements. An adjustable clamp to grip the glass bottle and a quick change fixture enable the versatility to test different categories of container from standard to magnum, as necessary. A chain link assembly connected to a suitable cork screw is used to locate into the plug material and apply the tensile load via the crosshead. Software control of the test stand and the ability to clearly indicate a pass or fail condition complete this system for reliable and accurate closure testing.

Mecmesin Systems: Force test systemsEmperor™ (Force)

Videos: Combi Cork Extraction Tester

box-crush-tests

Box crush test (BCT) and transit packaging compression testing

Boxes for the consumer and transit packaging industries must be as light as possible whilst still retaining a robustness to contain and protect their contents and also have the strength to stand up to shipping, handling and stacking requirements in service. The use of corrugation adds rigidity to paper and card packaging materials, which are tested in compression with several crush testing / top-load standards, namely the box crush test (BCT) and the related edge crush test (ECT) and stacking crush tests. Suppliers may also require modified tests to suit specific customer’s needs, as transit packaging particularly can undergo a variety of loading during its journey. The international industry quality assurance procedures for the box compression test may require self-levelling compression plate(s) in order to follow the pattern of failure, or some standards stipulate only the upper must be spherically pivoted to meet this requirement. Other standards indicate rigid compression plates when loading opposite sides (or corners) of the box. The BCT test loads the box at a constant rate to a nominal compressive load, or until the container collapses. In-house testing may use custom fixtures to load the box for unique crush situations such as edge to opposite edge.

Mecmesin Systems: Force test systems

Standards: ISO 12048, BS EN 22872:1993, ISO 2872:1985

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

 

Plastic film friction testing testing

Coefficient of friction testing methods for plastic film and sheeting

The static and kinetic dry friction properties of contacting surfaces is extremely significant in the labelling, packaging, print and warehousing/shipping/moving industries. Surfaces which move over each other easily are preferred in the production of packaging materials—influential for machine settings to control rollers, feeders and grabbers. Higher forces to initiate relative movement are desired in shipping processes, where the minimising of slipping is fundamental for safety reasons. Testing must be performed to evaluate the surface roughness and the effects of surface coatings and inks, as the COF of such a system cannot be calculated—it must be measured experimentally. The key standards require a horizontal test plane and a sponge-covered sled of a specified weight to apply a known normal force between the surfaces. The accurate determination of static friction, which is calculated from the measurement of the first peak force value as the surfaces begin sliding, may require an elastic linkage between the crosshead and the sled to control the inertial impact. Once movement is underway, if dynamic friction is to be calculated, the critical threat to accuracy becomes stick-slip and fish-tailing. In this situation the option of an interchangeable, rigid link is necessary. The results of five valid tests are used in the calculation and extreme care must be taken not to contaminate the samples, which may also need to undergo conditioning at a standard temperature and humidity level.

Mecmesin Systems: FPT-H1 Horizontal Tester, Grips, fixtures and accessories

Standards: ASTM D1894, BS EN ISO 8295

COF testing of paper and board

Coefficient of friction testing methods for paper and board

Sheet materials are produced in volume and supplied in bulk, in formats suitable for machine handling. Surface characteristics change through coating, inking, abrasion, folding, creasing and perforation. Coefficient of friction is significant to throughput and different at each change of use. Pulp and paper manufacture may utilise large rolls for web offset presses, large flat sheet-fed formats, down to digital presses, copiers and office printers. When considering supply of paper and board, customers specify COF requirements, in relation to machine and cross directions, and other attributes such as rub and blocking, if relevant. Testing based on standard ISO 15359 requires dedicated hardware to measure the forces and hence accurately calculate the static and kinetic friction. A horizontal plane method is used, with a sled dimensioned so as to exert a specified normal pressure on the contact surface. Importantly, there must be the capability to the set-down, dwell time and lift of the sled so as to protect the test pieces from surface damage and ensure that the sliding is also expressly controlled. This test covers the measurement of the static and kinetic coefficients of friction, the dynamic value being measured after three slides, and the calculation requires six valid results to average. Similar test standards do not stipulate an elevating mechanism, thus the ability also test without this feature adds versatility.

 

Mecmesin Systems: FPT-H1 Horizontal Friction Tester, ASTM 15359 Friction testing accessories

Standard: ISO 15359, Tappi T549

Packaging tin label peel test

Cosmetics tin label peel

Adhesion quality in post-production packaging labels is a more accurate test than on basic materials, due to deposits on surfaces and from operating environments. Post-production packaging, such as small metal containers, can, however, be awkward to hold during test.

Our client needed to perform a 90 degree peel test on labels applied to small tin lids. Mecmesin designed a dedicated custom grip to hold the tin without distortion, on a moving table peel jig. This ensured correct alignment every time for repeatable testing.

 
Bottle cap pull-of testing

Metal bottle cap on glass pull-off test

Gripping the base of a shaped glass bottle for a tensile test can present greater difficulties than for torque tests. Our client needed to pull a foil screw cap and tamper-evident sleeve from bottles of various sizes, without slipping at forces exceeding 1 kN. Barracuda grips are available for the cap, but the bottle required custom design.

Mecmesin designed adjustable V-jaws with rubber-edged finger grips that could interleave for smaller bottles yet be wide enough for larger ones. This provided the required grip under tension and axial alignment for the cap pull-off. Gripping samples securely becomes reliable and quick for improved throughput.

 
Pump dispenser actuator compression force test

Pump dispenser bottle operation

Propellants are avoided for many reasons in liquid and spray dispensers, with manual spring-loaded pumps used in their place. These are shaped for finger operation, and filled containers give a more reliable operational test. So how do you repeatedly test an awkward and messy pump dispenser?

Mecmesin met a client's needs with a custom designed bottle holder, and collection bin in stainless steel. This efficient solution ensured correct alignment, secure gripping under compression, and cleanliness.

Pharmaceutical bottle holders and cap mandrels for torque testing

Multi-way bottle closure grips and mandrels

A pharmaceuticals company wanted to test the closure torque of a series of  square-profile PET bottles. To minimise operator adjustment, they wanted to test all bottles at a constant height, using their Vortex-i torque tester.

Mecmesin responded by designing a set of nesting bottle holders along with a custom-moulded mandrel set. In this way each bottle could be axially aligned and presented at the right height under the torque head, for maximum test throughput.

 
Custom vacuum fixture to completely secure a thin plastic container

Peel testing vacuum-formed containers

Semi-rigid vacuum-formed packaging, sealed by film or foil, is tested by the 135 degree peel method, to represent hand-pulling. The difficulty for testing is always in mechanical holding of the container. Our client was testing food packaging of a particular design and required a custom solution.

Mecmesin designed and provided a fixture to hold the flexible container in a matched recess by vacuum, at 45 degrees to the test stand column, and to peel from a corner. The film lid was gripped and linked to the crosshead by a chain link to achieve a secure and repeatable test. Vacuum fixtures also allow for rapid throughput of samples for quick and efficient testing.

 
Custom fixture to secure a box for edge crush testing

Carton diagonal edge crush strength

In addition to top-load carton crush testing, the compressive strength across opposite edges can be an important measurement. This represents a typical shelf and stacking situation where damage can occur from falling. Holding a carton for this test without slippage requires custom fixtures to achieve the correct length and angle of applied compression.

Mecmesin has met these requirement for a number of clients, with custom-designed V-profile compression bars. These ensure the same angle of testing, along the length of the carton to be compressed, for perfectly repeatable testing.

 
Sachet burst strength testing fixture

Pharmaceutical sachet burst strength

Plastic sachets with welded seams are frequently used for measured applications of liquids, creams and gels. A quick quality test for their integrity involves compression either to burst, or to resist a defined compressive force. This may require containment for spillage, but also for alignment. Our client was testing pharmaceutical sachets.

Mecmesin designed a sliding container, engaging under the test compression plate with ball catches for exact axial placement. This enabled quick exchange of test samples for maximum throughput and repeatability.

 
Card crease force testing

Card and paper crease line testing

A packaging production company needed to test the maximum crease force in 90 degree folds in various materials. This required continuous accurate measurement by cantilever bend, through the folding movement.

Mecmesin designed a customised fixture to manually rotate the gripped card against a compression bar attached to one of our 100 N advanced digital force gauges. Clickstops at 45 and 90 degrees allowed the folding force to be recorded consistently at each angle for any material. Mounted on a manual test stand, this was a very cost-effective solution to their requirements.

Custom fixture to peel test a medical packet

Semi-rigid clinical packaging opening peel

Our client needed to test the peel quality of film lids on semi-rigid pre-filled syringe packs. Inconsistent peeling can result in accidental content spillage, so the force required at a standardised 135 degrees must be measured for a complete opening action. Holding semi-rigid packaging so that it does not deform, requires a custom application for each pack design.

Mecmesin designed and manufactured a vacuum holder for an exact fit to the pack, positioned at the required angle under an extended tensile test arm. The lid was then peeled back with a grip on a flexible chain link. An added advantage of vacuum fixturing is the speed and accuracy of sample changing for maximum throughput and efficiency.

 
Custom fixture to clamp a biopsy injector of spring compression testing

Pneumatic top-load control for CRC cap torque testing

Torque testing of child-resistant bottle caps requires application of a simultaneous top load. Raising and lowering this repeatedly in a testing sequence is much easier, quicker and more secure when automated. Our client wanted to eliminate this manual effort by test operators.

Mecmesin supplied a pneumatic lift mechanism for the client's Vortex torque test stand, to lift the top-load weights and lower the torque head into place for each cap test. This makes batch testing quicker, more reliable, and less tiring for the operator to perform.

 
Flip cap pull-off testing

Cosmetics tube flip-cap attachment strength

Many flip-caps on flat-sealed cosmetics tubes are not designed for consumer removal, and should not come off under normal use. Pulling them off to test the required force, without distortion through over-gripping, led our client to request a custom fixture.

Mecmesin provided a means of pulling the cap from the inside, a simple but effective solution for reliable and repeatable testing.

Testing the adhesion of a foil lid

Powdered drink container

An international supplier of a powdered hot chocolate drink wanted to test several aspects of their plastic-capped, foil-sealed cardboard tube container. This included topload (column crush) of the cardboard, flip-off for the plastic cap and 90 degree peel testing of the metal rim and foil closure element, both removed and in situ.

To enable correct and secure gripping to an assisted peel table, Mecmesin designed a custom jig to hold either the tub base or the top rim closure. The client was then able to use their Mecmesin universal tester for all four tests, with quick and easy exchange of fixtures, and rapid throughput of samples for testing.y.

Custom fixture to secure a teabag for strength od string tab tests

Tea bag integrity

Some of the simplest applications may not seem so obvious when you face them. A string and tab on a tea bag? Commonly stapled in place, the test should be on the clipping of the string, not the tear strength of the bag itself.

For our client, Mecmesin devised the simple 'tea bag hook' to do just this. A small part, a simple test, but now done efficiently and consistently for daily quality assurance and brand protection.

 
Packaging fold-out tensile testing

Cardboard beverage bottle carrier unfolding

A manufacturer of flat-supplied cardboard beverage bottle carriers, wanted to quality test the fold-out force for a variety of designs. Ideally the faces needed to be pulled evenly apart.

Mecmesin designed a base plate with locating flanges for each design to be tested. The underside of the flattened pack was held in place by vacuum pumped suction, and the upper pulled up by a cluster of suction cups. Test samples could then be laid quickly and the vacuum engaged, then the pulling fixture similarly lowered and suction engaged on the upper surface. Accurate measurement of the pulling force to open each box out could then be made.

 
Custom are required mandrels for container closure tests

Custom bottle cap mandrels

Plastic bottle caps and T-corks have individual profiles for finger gripping, and the best way to torque-test their performance is by providing an exact machine grip at as many points as possible. Many well-known brands and manufacturers come to us for custom-profiled mandrels to use on their torque testers.

A custom mandrel is much quicker to place and release than a screw-fit clamp, and by precise positioning offers true repeatability in testing of bridge torque, removal torque and running torque.

Cosmetics jar lid torque testing equipment

Split mandrels for closure torque testing

Smooth twist caps on bottles and jars require an adequate and symmetrical grip without distortion. For any particular product line and size, a customised grip will always perform best and produce the most reliable results.

At Mecmesin we regularly design and manufacture mandrels for specific closures, and one approach is the convenient split mandrel with a simple screw clamp, for quick application and release. Items such as cosmetics containers can especially have designs that are easy for the hand, but difficult for machine holding, so a modified or custom grip may also be needed for the container. Again, our custom engineering service can provide a suitable fixture design for you.

Custom mandrel to secure closure sample for torque testing

Child Resistant Closures (CRC) mandrel

Child Resistant Closures (CRC) require axial force and simultaneous torque, for testing removal torque, or reverse-ratchet torque. Mecmesin torque testers, such as the Vortex and Helixa, will do this to international industry standards and regulation, but the most reliable results will be obtained by using a custom-profiled mandrel for the cap.

We regularly design and provide custom mandrels, especially to the pharmaceuticals packaging sector. Contact us with your requirements for a quick response towards improved testing.

 
CD002 90 Degree Weld Seal Vacuum Fixture 220

Retort pouch 90 degree peel seal strength test

Consumer packaging products where a flexible thin material (such as plastic or aluminium foil) forms a peelable lid, should undergo peel testing. The adhesive bond is formed around a mating surface at the perimeter as seen in the seams and seals of retort pouches or pots for the food industry and medical device packages. The test program must maintain the 90 degree pull angle, with the container remaining horizontal whilst travelling laterally via moving table jig, achieved by mechanically driving the table from the vertical motion of the test stand crosshead. Consideration should be given to securing the container and a bespoke moulded vacuum fixture is recommended, particularly if the quality standards stipulate that deformation should be minimised. Suitable flat-jawed grips are needed to securely grasp the lid throughout its vertical movement.

Mecmesin Systems: MultiTest motorised test system

Case Study: Retort Pouch

CD014 carboard beverage tension test system 220Glued cardboard packaging tensile strength

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

CD015 top-load PET bottle 220Top-load testing PET bottles and containers

A consumer packaging manufacturer supplying the leading brands in diverse markets must ensure that their product testing meets the demands of all organisations in the supply chain. For a producer of PET (Polyethylene terephthalate) plastic bottles, part of the total quality control must ensure the axial strength of bottles is continuously monitored (see this article: why test top-load?). The industry demands a responsible approach to minimising raw materials for both cost and environmental reasons, so strength remains critical for the containers, from filling and capping to transport and storage. Top-load (column) crush test systems can be employed at the production line (with a console-controlled touch screen for quick access to relevant test programs) to allow bottles to be sampled at regular intervals. Typically a top loading at 250 mm/min is applied to measure maximum load before buckling. These systems are also used for cap lid pull-off tests and the ease-of-use afforded by a favourites screen permits rapid, repeatable testing at the touch of a button.

Mecmesin Systems: Top-load crush testers, touch screen test systems

Case Studies: Top-load testing PET bottles, top-load automated crush testing PET bottles

Torque testing requires concentricity for accurate measurement

Closure torque measurement with large or irregularly shaped containers

Closure torque testing involves a range of tests for events designed into screw caps, lids and unthreaded stoppers. It can include a measure of the turning force required to initiate twisting, possibly to overcome safety features (e.g. CRC Types I and II) and tamper resistance features, and also to secure the closure. Other rotational systems, for example bearings, also benefit from the evaluation of the required torque to turn—both breakaway and running torque. Accurate measurement of the torque characteristics of these systems requires alignment of the rotational components with the grips and fixtures of the testing equipment. In the case of large or irregularly shaped products, custom designed fixtures may be needed to assure concentricity of the closure with the crosshead, and permit adequate clearance throughout the complete angle of rotation performed in the test.

Mecmesin Systems: Vortex torque testing systems with customised testing fixture design

 

Compressive burst test on a flexible welded seal

Flexible packaging weld seal compressive burst strength

The flexible consumer packaging solution, comprising a squeezable plastic tube with welded seals is a common and versatile option in household, cosmetics, healthcare and food industries. The manufacturer must ensure the long-term integrity of the packaging to contain a variety of products further down the supply chain. Poor quality in the seals will result in product leakage, either during production handling, transport or in use by the end consumer. Compressive burst testing at the manufacturing source may be implemented as part of a series of in-process verifications. An effective process requires a multipurpose probe design to cater for different sizes of package and still exert the stipulated pressure on the welds – this example utilises a cylinder-shaped compression fixture. A touch-screen console test stand facilitates rapid and consistent testing at the production site, by a simple button press to select pre-programmed routines. The results analysis software can indicate pass/fail conditions and highlight the onset of out-of-specification conditions.

Mecmesin Systems: Touch screen force test systems

Case Study: Flexible Packaging Seal Strength