| 摘要 |
Disclosed herein are a biaxially orientated polypropylene film for paper-plastic composite without adhesive and a preparation method thereof. The film includes a surface layer (5), a core layer (3) and a functional layer (1) in turn and the film is obtained by co-extruding. The functional layer (1) can combine directly with paper, preprinted paper or film including the layer. It is arranged a top subsurface layer (4) between the surface layer (5) and the core layer (3). It is arranged a subjacent subsurface layer (2) between the core layer (3) and the functional layer (1). The preparation method of the film comprises the following steps: transferring the chosen raw material into an extruder and plasticizing them to melt; transferring the melt through a passage; filtrating the melt by a filter; distributing the melt to a die head; then manufacturing the film by flat-film extrusion or pipe soaking method respectively; treating the film with corona or flame to mother-roll; aging the mother-roll; and cutting it to film product finally.
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