Testing for Water Vapor Transmission and Gas Transmission of Edible Oil Bottles

1. Instruments
W3/330 Water Vapor Transmission Rate Tester
OX2/230 Oxygen Transmission Rate Tester             
2. Specimen

Fig 1 Edible Oil Bottle

During the long term storage, oil may become deterioration caused by the chemical changes related to atmosphere, sun light and moisture. Thus, the packages for oil should have good sealing and barrier properties, especially the barrier capability against water vapor and atmosphere. Thus, the edible oil bottle, as the packaging agent for oil, should be evaluated for the water vapor and gas transmission performances, so as to determine the barrier properties and provide guidance for manufacturers.
3. Introduction to Testing
The test needs customized package mouth sealing device and longer PU pipe, for specimen sealing and gas cycling inside the specimen.

Fig. 2. Customized Package Mouth Sealing Device & Longer PU Pipe

4. Testing Procedure
4.1 Testing for Water Vapor Transmission Performance
4.1.1 Testing Environment
Place: Labthink Permeability Laboratory
Temperature: 23℃
Relative Humidity: 90%RH
4.1.2 Testing Procedure
Cover the copper pipe of the package mouth sealing device with the PU pipe. Then, seal the specimen with instant transparent solid glue (Fig. 3). After sealing, clamp onto the instrument (Fig. 4), wrap the parts above the plate with sealing bag (Fig. 5), set the testing parameters and start testing. The test will end automatically, and the results will be displayed on the software interface. 

4.1.3 Testing Results
Edible oil bottle         WVTR      0.1068 g/(pkg·d)
4.2 Gas Transmission Testing
4.2.1 Testing Environment
Place: Labthink Permeability Laboratory
Temperature:   23℃
Testing Gas: Air
4.2.2 Testing Procedure
Cover the copper pipe of the package mouth sealing device with PU pipe. Then, seal the specimen with instant transparent solid glue (Fig. 6). After sealing, clamp on to the instrument (Fig 7). Set the testing parameters and start testing. The test will end automatically, and the results will be displayed automatically onto the interface of software.

4.2.3 Testing Results
Edible Oil Bottle        OTR           0.4693ml/(pkg·d)