Chemical Characterization of Food Packaging Varnish Raw Material Changes
Chemical characterization of varnish raw material changes demands spectroscopic conversion tracking and chromatographic migration screening to prevent food contact failures.
Robinson Sensory Test
Taint Evaluation
Organoleptic detection of off-flavors compared to a control sample ensures that packaging materials do not contaminate the taste of food. The robinson sensory test is a standardized method where food is stored in close proximity to the packaging under controlled conditions. It relies on a panel of trained testers to identify any changes in the sensory profile of the product.
Panel Testing
The test often uses milk chocolate or butter as the test medium because these foods are highly sensitive to absorbing odors. Samples of the food are placed in a sealed jar with the packaging material but are kept physically separate to ensure only gas phase transfer occurs. After a specific period the food is tasted and compared to a control sample that has not been exposed to the packaging.
Testers use a numerical scale to rate the intensity of any perceived taint. This process is essential for verifying the safety and quality of new ink or varnish formulations. Consistent results require a neutral environment and a panel of participants with a high sensitivity to flavors.
Result Interpretation
A high score on the scale indicates a significant transfer of odor and may lead to the rejection of the material. The method identifies the threshold where chemical migration becomes a sensory issue. This test defines the organoleptic quality of the packaging before it reaches the consumer.
It ensures that the brand identity and the product flavor remain intact.