Investigation Of Multilayer Films For Packaging
Karki, Reeta (2016)
Julkaisun pysyvä osoite on
Three different methods were used in the investigation of multilayer films by using UV-Vis spectroscopy, artificial sunlight lamp and testometric tensile testing machine. Eleven kinds of multilayer films with different thicknesses and layers were tested by UV-Vis spectroscopy and radiation test was done by artificial sunlight lamp. Again the same samples were examined by UV-Vis spectroscopy. At last all the samples were tested by tensile test machine. After the experiment all the samples were found to be UV protected. Generally, the samples were divided into two parts i.e. transparent and opaque multilayer films. All the samples were observed unchanged visibly after radiation test but when the same samples were again tested by UV-Vis spectroscopy then all the transparent films were found affected in UV region (190-380) nm by the radiation of artificial sunlight lamp whereas opaque films (B, C and D) indicated insignificant changes. Likewise opaque and printed films (E and F) were also affected by radiation slightly. The reasons for these changes were not highlighted in this thesis because the composition of the samples was mysterious. Another work could continue to find out the details of these changes by the future researcher. Furthermore the tensile test results showed that the transparent films were more flexible and had less tensile strength in compared to opaque films. The possible sources of errors may involve in the method of sample preparation and the random errors during the repeatable procedure. Similarly it was a tough task to make a sample with specific length and width where fine and smooth edge was must. As there was not any particular tool to make the sample, scissor and scalpel was used. At last it was realized that the design of the testometric material testing machine was not suitable for this kind of experiment.