Heat Seal Processing by Using Various Seal Bar Shape

In this study, oriented polypropylene/cast polypropylene (OPP/CPP) laminated films were heat sealed by various stainless mesh sheets in order to evaluating the effect of heat sealing bar shape on heat sealed properties. The heat sealed conditions were set at heat sealed time of 1.0 s with a pressure of 0.3 MPa at various heat sealed temperatures of 100 to 120 degrees C. The difference of higher order structure of these films was discussed on the basis of results of micro-Raman spectroscopy, DSC and peel test. From the result, it was found that peel strength was affected by the heat sealing bar surface shape. It can be note that the relationship between the internal structure change and properties of the heat sealed films could be clarified by analyzed at very small area of the heat sealed films on the basis of the results by using micro-Raman spectroscopy imaging.