Gelbo Flex Tester ASTM F392
Importance of Flex Durability Testing
Testing the flex durability of packaging materials under different conditions is crucial for several reasons. Let me explain the importance using easy-to-understand language and clear reasoning.
Firstly, packaging materials go through various stresses during transportation, handling, and storage. They can experience bending, twisting, or compression when subjected to different forces. By testing the flex durability, we are essentially evaluating how well the packaging material can withstand these mechanical stresses.
Secondly, flex durability testing helps in ensuring the protection of the packaged product. Imagine if a product is packaged in a material that easily tears or fails when flexed. During transit or when stored in tight spaces, there is a high likelihood of damage to the product. By testing the flex durability, we can identify potential weaknesses or vulnerabilities in the packaging material and make necessary improvements to prevent product damage.
Furthermore, flex durability testing provides valuable data for quality control and regulatory compliance. Standards set by organizations like ASTM (American Society for Testing and Materials) establish criteria for packaging performance. By conducting tests following these standards, packaging manufacturers can assess whether their materials meet the required specifications. This ensures consistency in packaging quality and helps in complying with regulations.
In conclusion, testing the flex durability of packaging materials under different conditions is crucial to safeguard products, prevent damage, and meet quality standards. Through these tests, we can identify weaknesses in packaging materials, improve their design, and certify their ability to withstand real-life usage scenarios.
Application
The flex durability tester is used to measure the resistance against repetitive strain for films, composites and coating films, etc. Flex failure is determined by measuring the pinholes formed in the sample structure. It is also called Gelboflex.
Good flex crack resistance will reduce the propensity of the package developing holes during the distribution cycle thereby destroying the package integrity.
Sampling and motion
The sample size (200 by 280 mm) is attached to the flex tester mandrels. The flexing action consists of a twisting motion combined with a horizontal motion (compression), thus repeatedly twisting and crushing the film. The test set up gives a twisting motion of 440º in the first 90 mm of the stroke and is followed by a straight horizontal motion of 65 mm. The speed is 45 cycles per minute.
The flexing action consists of a twisting motion combined with a horizontal motion repeatedly twisting and crushing the film. There are 5 pre-programed test conditions to choose from:
- Mode A– Full flex for 1 hour (2,700 cycles),
- Mode B– Full flex for 20 minutes (900 cycles),
- Mode C– Full flex for 6 minutes (270 cycles),
- Mode D– Full flex for 20 cycles,
- Mode E– Partial flex for 20 cycles
Main Parameter
- Flex Frequency 45/minute
- Flex Angle 440°（90mm）or 400°（80mm）
- Capacity 2.5 N.m
- Horizontal Stroke 155mm or 80mm
- Stations 4
- Sample Size 280mm x 200mm
- Power 220V
Standard
Standard Practice for Conditioning Flexible Barrier Materials for Flex Durability
Incorporating flex durability testing, specifically focusing on barrier films, is integral for industries relying on precise material properties.
