Characterization of biaxially oriented polypropylene (BOPP) films containing baggy web defect

Choir, Yek Guan (2022) Characterization of biaxially oriented polypropylene (BOPP) films containing baggy web defect. Project Report. Melaka, Malaysia, Universiti Teknikal Malaysia Melaka. (Submitted)

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Abstract

Biaxially-Oriented Polypropylene (BOPP) film is well-known for its excellent mechanical and physical qualities, and it is frequently used as a packaging film. The BOPP films made by San Miguel Yamamura Plastic Film Sdn. Bhd. (SMYPF) are found to have a baggy web flaw. This project focused on the characterization of defective film. Two types of sample were provided by industry which are normal and defective sample. To achieve the first objective on film thickness variation analysis on BOPP films containing baggy web defect, a scanning electron microscope (SEM) was employed to visualize the thickness of cross-sectioned films. Second objective of this work was to investigate the crystallinity of film, where X-ray diffraction (XRD) was used. The SEM results show that the thickness of film containing baggy web defect is higher than normal samples, hence it is proven that the baggy web defect is correlated with the thickness variation on BOPP film. On the other hand, XRD results show that the crystallinity of film is directly proportional to the production temperature. Reducing the production temperature causes formation of beta form crystal in the film, which leads to lower crystallinities. It was found that the defect region normally has 3-5 percent higher crystallinity compared to normal region on the same films. This is because non-uniform heat flow of extruder causes the crystalline growth at different rate throughout the film surface.

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