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Fakulteta za strojništvo, Ljubljana (FSLJ)
  • Effect of calendering temperatures on mechanical properties of polypropylene foils [Elektronski vir]
    Aulova, Alexandra ; Bek, Marko ; Slemenik Perše, Lidija
    The majority of plastic products nowadays are produced by extrusion, which combined with the calandering process results in polymer foils. The foils are typically used for production of the end ... product using other manufacturing technique, for example thermoforming for production of the plastic packages for food industry. Considering several steps leading from the raw material to the end product, the process might be treated as complex. Polymer melt travelling through the heated calander rollers cools down to the crystallization temperature and forms its crystalline structure, which determines optical, mechanical and permeability properties of the end product. The crystalline structure is formed in very complex conditions including temperature input from the rollers, ambient cooling from the atmosphere and stresses induced to the polymer melt by calander rollers. Due to significant temperature difference between the melt (230°C) and the air (30°C) cooling rate here plays significant role and is mostly dependent on the calander rollers% temperature [1]. Moreover, cooling rate is different on the different sides of the polymer film formed and results in different crystalline structure that eventually after thermoforming might cause optical and mechanical defects in the final product.
    Vir: Book of abstract [Elektronski vir] : MTDM 2018 (F. 97-98)
    Vrsta gradiva - prispevek na konferenci
    Leto - 2018
    Jezik - angleški
    COBISS.SI-ID - 16267035

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