GFT Gelbo Flex-tester
- Standaard: ASTM F392
- Fabrikant: Celinstrumenten
- Toepassingen: Verpakkingsmaterialen, materialen voor medische hulpmiddelen, farmaceutische testen, lijmen, textiel, papieren en kartonnen verpakkingen, en meer.
- Aanpassing: Beschikbaar voor speciale testvereisten en automatiseringstransformaties
Introduction of Gelbo Flex Tester
De Gelbo Flex-tester is a specialized instrument designed to evaluate the flex durability and mechanical integrity of flexible materials such as barrier films, laminates, and coated fabrics. By simulating real-world twisting and compressive deformation, this tester provides critical insights into the resistance of packaging and coated materials to pinhole formation, cracking, En barrier property degradation. Standards such as ASTM F392 En ISO 7854 define the testing methods that ensure accuracy, repeatability, and international comparability.
De Gelbo Flex-tester, sometimes referred to as a rumple flex tester of flex tester, operates by subjecting test specimens to simultaneous twisting and compressing motions. This combined action reproduces the mechanical stress flexible packaging materials experience during filling, sealing, transportation, and storage.
The test method, commonly known as the Gelbo test method, evaluates a material’s ability to maintain integrity under cyclic deformation. Materials that fail this test often develop microscopic pinholes or cracks that compromise the package’s barrier performance against oxygen, moisture, or gas transmission.
Principle of the Gelbo Flex and Related Standards
Two primary international standards govern flex durability evaluation: ASTM F392 En ISO 7854.
ASTM F392, titled Standaardprocedure voor het conditioneren van flexibele barrièrematerialen voor flexibele duurzaamheid, specifies test conditions for assessing the resistance of flexible packaging materials to flex-induced pinholes and barrier failures. In this method, specimens undergo repeated flexing at 45 cycles per minute, involving a 440° twist combined with a 65 mm horizontal motion. The test is conducted under standard conditions of 23 ± 2°C En 50 ± 5% relative humidity. Depending on the desired conditioning level, test cycles may range from 20 to 2700, corresponding to levels A through E.
ISO 7854, Rubber- or plastics-coated fabrics — Determination of resistance to damage by flexing, defines three methods of flex testing. Method C, known as the crumple/flex method, closely resembles the Gelbo principle. Here, a cylindrical specimen is subjected to oscillating twist and axial compression, simulating real-life flex stress for coated fabrics, medical materials, and technical textiles.
Together, these standards establish the Gelbo flex procedure as the global benchmark for flex durability testing.
How the Gelbo Flex Tester Works
De Gelbo Flex-tester (for example, the GFT Flex Durability Tester by Celinstrumenten) operates with high precision to replicate ASTM and ISO flexing motions.
- Monstervoorbereiding: Standard samples are 200 × 280 mm, cut in both machine and transverse directions.
- Mounting: Samples are clamped or adhered to the tester’s mandrels, forming a cylindrical shape for simultaneous twisting and compression.
- Flexing Cycle: The tester executes a 440° twist during the first 90 mm of stroke, followed by a 65 mm linear compression, at a consistent 45 cycles per minute.
- Mode Selection: Users can select from five programmable test modes (A–E) to suit different material types or test objectives.
- Result Evaluation: After conditioning, specimens are inspected for pinholes, cracks, or barrier degradation using OTR (Oxygen Transmission Rate), WVTR (Water Vapor Transmission Rate)of GTR tests.
This controlled process allows laboratories and quality control teams to quantify a material’s flex resistance and predict its performance under real-world mechanical stress.
Key Features and Main Parameter
De GFT Gelbo Flex-tester series from Celinstrumenten offers advanced technology designed for high precision and ease of use:
- PLC Control & Touchscreen Interface – Ensures accurate motion control, user-friendly operation, and data repeatability.
- Multiple Test Stations – Available with three or four stations for parallel testing and comparative analysis.
- Programmable Test Conditions – Supports ASTM F392 modes A–E for versatile testing from quick screening (20 cycles) to endurance evaluation (2700 cycles).
- Durable Mechanical Design – Engineered for long-term stability and compliance with ASTM F392 En ISO 7854 normen.
- Enhanced Data Reliability – Supports post-test evaluation of barrier integrity, pinhole formation, and mechanical strength changes.
| GFT Gelbo Flex Durability Tester | ||
| Parameter | GFT-02 Model | GFT-01 Model |
| Flexibele hoek | 440° (90 mm) of 400° (80 mm) | |
| Capaciteit | 3.5 N.m | 2,5Nm |
| Horizontale slag | 155 mm of 80 mm | |
| Stations | 3 | 4 |
| Steekproefgrootte | 280mm x 200mm | |
| Stroom | 110~220V | |
Applications of Gelbo Flex Testing
Gelbo flex testing is essential in industries where flexible materials must retain barrier integrity and aesthetic quality after repeated handling or mechanical stress. Key application areas include:
- Flexible Packaging for food, pharmaceuticals, and medical devices
- Coated Fabrics and Films for industrial, textile, and outdoor uses
- Adhesive Laminates En composite structures
- Kwaliteitscontrole in R&D laboratories En certification agencies
By identifying weak points early, manufacturers can improve material formulation, coating technology, and lamination processes.
Veelgestelde vragen
A: De Gelbo Flex Tester van Cell Instruments beschikt over een unieke mix van precisietechniek en innovatieve ontwerpfuncties. Van de intuïtieve gebruikersinterface tot de geavanceerde automatiseringsmogelijkheden, elk aspect is zorgvuldig ontworpen om de prestaties en gebruikerservaring te optimaliseren. Bovendien onderscheidt de compatibiliteit met een breed scala aan materialen en industrieën het als een veelzijdige oplossing voor flextestbehoeften.
A: Door materialen aan strenge flextesten te onderwerpen, helpt de flexduurzaamheidstester zwakheden en potentiële faalpunten vroeg in het ontwikkelingsproces te identificeren. Deze proactieve aanpak stelt fabrikanten in staat om problemen aan te pakken voordat ze escaleren, wat resulteert in producten die veerkrachtiger, betrouwbaarder en uiteindelijk van hogere kwaliteit zijn.
A: Absoluut! De Gelbo Flex Tester is ontworpen om een breed scala aan monstergroottes en -vormen te verwerken, en biedt flexibiliteit en veelzijdigheid bij het testen. Of u nu werkt met kleine, delicate films of grotere, omvangrijkere materialen, onze tester kan zich gemakkelijk aanpassen aan uw specifieke testvereisten.
A: Precisie is van het grootste belang bij de flex sustainability tester. Door nauwkeurige kalibratie en robuuste constructie zorgen we ervoor dat elke test consistente, betrouwbare resultaten oplevert. Bovendien is onze tester ontworpen om externe factoren die de testresultaten kunnen beïnvloeden, te minimaliseren, wat de nauwkeurigheid en herhaalbaarheid verder verbetert.
A: Bij Cell Instruments geven we prioriteit aan klanttevredenheid en ondersteuning. Ons toegewijde technische ondersteuningsteam staat klaar om gebruikers te helpen met alle vragen, zorgen of technische uitdagingen die ze tegenkomen. Of u nu hulp nodig hebt bij de installatie, kalibratie of probleemoplossing, onze experts staan klaar om u snelle en effectieve ondersteuning te bieden om ervoor te zorgen dat uw testprocessen soepel verlopen.
Referentie
ASTM F392 Standaardprocedure voor het conditioneren van flexibele barrièrematerialen voor flexibele duurzaamheid
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