| Summary: | 碩士 === 國立中正大學 === 化學工程研究所 === 93 === The extrusion blown film process is widely used and well developed technology in making thin-film products for industrial and packaging applications. Compared to the flat-die process, thicker, wider HDPE geomembrane products manufactured by the blown film (Round-Die) process a lower investment and flexible production issues.
The HDPE resins used for the geomembrane production in a blown film process should have a higher molecular weight to provide the required melt strength, and bubble stability . A narrow molecular weight distribution (MWD) is needed for providing requirements of uniform properties of geomembrane products, but the sharkskin (melt-fracture) phenomenon often appears on the surface of the products. This poor appearance will lead to the poor tensile strength and elongation.
In this paper some carbon black masterbatches are tested to modify the rheology of HDPE resin. Each carbon black masterbatch is mixed with the HDPE resin, fed into the extruder for testing. The data of melt temperature, melt pressure, torque of the extruder, output, bubble stability, die deposit and surface phenomenon are collected for evaluation. The effects of surface roughness on properties are also studies.
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