GFT-02 Flex Durability Tester

Background
1. One key property of flexible barrier material is the resistance against
repetitive strain, which is called flex durability, or Gelboflex.
Good flex crack resistance will reduce the propensity of the package developing
holes during the distribution cycle thereby destroying the package integrity.
2. A critical property of flexible barrier materials is their ability to
withstand repetitive strain, known as flex durability or Gelboflex resistance.
Strong flex crack resistance is essential as it lowers the risk of package
perforation during distribution, safeguarding package integrity.

Application
1. 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.
2. The flex durability tester, also known as Gelboflex, assesses the ability of
materials like films, composites, and coating films to withstand repetitive
strain. It quantifies flex failure by detecting pinholes that may develop in
the sample structure. Excellent flex crack resistance is vital as it minimizes
the risk of packaging developing holes during distribution, ensuring the
package remains intact throughout its journey. This is crucial for preserving
the integrity of the contents within.
3. The flex durability tester, often referred to as Gelboflex, is employed to
assess the ability of materials such as films, composites, and coating films to
withstand repeated strain. It gauges flex failure by detecting the formation of
pinholes within the sample's structure. Strong flex crack resistance plays a
crucial role in preventing the development of holes in packaging during
distribution, preserving the package's integrity throughout its journey.
Standard
ASTM F392, "Flex durability of flexible barrier materials".

Sampling and motion
1. 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.
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.

2. In the flex tester, a sample measuring 200 by 280 mm is affixed to the
mandrels. The flexing process involves a combination of twisting and horizontal
compression, repeatedly subjecting the film to both actions. Specifically, the
setup initiates a twisting motion spanning 440 degrees within the first 90 mm
of the stroke, followed by a linear horizontal motion of 65 mm. The entire
cycle occurs at a speed of 45 cycles per minute.
Users have the option to select from five pre-programmed test conditions.
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.

3. The test procedure involves attaching a sample measuring 200 by 280 mm to
the flex tester's mandrels. This flexing action combines twisting and
horizontal compression, repetitively twisting and crushing the film. The setup
initiates a 440-degree twisting motion within the first 90 mm of the stroke,
followed by a straight horizontal motion of 65 mm. The entire cycle operates at
a speed of 45 cycles per minute. Users can select from five pre-programmed test
conditions.


Technical Features
The system features PLC control with an intuitive HMI touch screen interface.
It offers five standard test modes and includes four test stations. Users can
quickly switch between long and short stroke modes. Test conditions A, B, C, D,
and E are selectable.


Main Parameters
Flex Frequency 45 /minute
Flex Angle 440° (90 mm) or 400° (80 mm)
Capacity 3.5 N.m
Horizontal Stroke 155 mm or 80 mm
Stations 3
Sample Size 280 mm x 200 mm
Power 110~220V

Minimum Order: 1 sets

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