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LT-03 Leak Tester Precision Leak Detection for Packaging Integrity
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- 2. 目 录 1 2 3 4 5 Testing Principle SystemDescription Features Test Process Possible Applications
- 3. 1 Testing Principle Leaktester is often referred to as vacuum/negative pressure method, or bubble emission method ， which is used as gross leak checking for flexible packages(with headspace gas) by eye observation. Reference standards A test sample is placed into a vacuum chamber with water and the air above water level is evacuated by a vacuum ejector. A pressure difference is created inside and outside the sample and leakage can be observed and identified when the sample is inflated. ASTM E515 ASTM D3078
- 4. 2 System Description Theleak tester is composed of a mainframe, vacuum chamber with water, and external compressed air, or an air compressor.
- 5. 2 System Description Mainframefunction 1) To allow compressed air, with a safe pressure to enter 2) To control the flow of compressed air to realize different vacuum 3) To have a touch screen for parameter setting and operation 4) To have a pressure sensor and programmable logic controller 5) To serve as a “chair" for vacuum chamber
- 6. 2 System Description VacuumChamber 1) It is a cast type water tank made of fine PMMA, with a strong top cover and a plate to keep sample in water. 2) Outer diameter 300mm, wall thickness 15mm, inner testing space 270mmΦ*210mm H. Cast type is good for alcohol, organic elements, esp. for food or pharm testing.
- 7. 2 System Description VacuumChamber Other Available Sizes and Shapes 1) If vacuum is not required very high, we could build cubic shape with different size and thickness 2) Other cylinder size. Outer diameter 400mm, 500mm, 600mm, thickness 18mm.Height could be as required
- 8. 2 System Description HowVacuum is Made? Thanks to Venturi effect, we can use a vacuum generator to produce stable, controllable and cost-effective vacuum. Compressor is cheap and vacuum caused by Venturi tube is not strong as that of a vacuum pump. Once the air flow is controlled, the vacuum is controlled. Ref: https://www.britannica.com/technology/venturi-tube The compressed air enters and goes through the Venturi tube and discharges, but generates vacuum which is connected with the chamber and pressure sensor. When the vacuum is reached for sample testing, the valve closes compressed air and opens it again if leak causes vacuum inside chamber to drop.
- 9. 3 Features Industrial Level Stability Cast Type PMMA Professiona lProgram Pressure Sensor Non- Standard Chamber Customer Logo 1) PLC control unit, and HMI touch screen, stable and good for harsh test environment 2) Cast type PMMA, strong and not turn yellow easily. 3) Soft keyboard input and parameter saving function. Sample Pass or Failure counting. 4) Pressure sensor used. 5) Support non-standard chamber fabrication. 6) Customer logo insert in screen.
- 10. 3 Features Display andcontrol screen Main Menu Data Record Parameter Setting
- 11. 4 Test Process 1 •To have water filled in chamber, with level depending on sample size. 2 • Submerge one or more sample in water. 3 • Close chamber and set test time and vacuum. 4 • Observe the sample status while vacuum rises and maintains. 5 • Record if sample fails at the set vacuum.
- 12. 5 Possible Applications 1)Use No Water In Chamber Put the liquid pack inside to see if liquid goes out. Or put inside chamber a small holder with water and pack with solid. This solves cleaning problem 2) Methylene Blue Test For Blister 1)put the blister into the chamber with solution(Methylene Blue) 2)venting the chamber and hold the vacuum for a while 3) stop the vacuum and hold blister in normal pressure. The dye can will enter the blister if there is leak.
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