PET Stress Crack Simulator – automating stress crack failure test in PET bottles

…key points:

Introduces automation to a manual & time consuming test.
Standardize Stress Crack Testing across your orginization.
User safety, constructed to CE standard.
Complies with the ISBT test method.
Operator only needs to fill and cap the container.
System automatically pressurises the container and exposes the article to the test solution.
System tracks and times the degradation of the container to failure.

…configuration

Automatic
6, 12, 18 or 24 Test Heads

…about Stress Cracking:

Typically PET environmental stress cracking originates around the base of the bottle. There are many factors which can cause this, as follows ;

The intrinsic viscosity of the preform used to blow the bottle.
Control of process and cooling parameters during the moulding process.
Contact with line conveyer lubricants during manufacturing.
Contact with solvents and other chemical based cleaning agents while on the shelf.

…about the test:

Performance of samples can be evaluated when the base of the bottle is immersed in a NaOH (Sodium Hydroxide) solution which simulates failure associated with Stress Crack. Prior to immersion the bottles are filled (to fill level) with water and pressurized. Failure results in a pressure loss or burst of the bottle.

The special purpose neck seal is placed on each pre-filled bottle, which is then placed in the Stress Crack Tester. A pre-programmed test profile is selected using the touchscreen HMI. Test profiles are set up by each customer specific to their testing requirements (Test Profile: Test Pressure, Rate of Pressure Increase, Test Time etc). After each bottle has been placed in the device, the interlocked safety door is closed and START is selected. Initially a test is conducted to ensure no leakage at the neck seal. Next, the pressure is ramped up, at the customer specified rate, to the required test pressure. The NaOH solution is released automatically at a prescribed time to immerse the base. Each bottle is then automatically monitored for the specified time. When failure occurs the time and head no. is recorded.

Downloads

PET Stress Crack Simulator datasheet

… we don't just build machines, we build relationships.

PET CONTAINER TESTING

GLASS CONTAINER TESTING

CO₂ SAMPLE PREPARATION & TEST

PET CONTAINER TESTING

GLASS CONTAINER TESTING

CO₂ SAMPLE PREPARATION & TEST