The Influence of Friction and Twisting Angle on the Tensile Strength of Polypropylene Baling Twine

Author:

Kostic Sonja1ORCID,Kocovic Vladimir2,Petrovic Savic Suzana2ORCID,Miljanic Dragomir3,Miljojkovic Jasmina2,Djordjevic Milan1,Vukelic Djordje4ORCID

Affiliation:

1. Department in Kragujevac, Academy of Professional Studies Sumadija, Kosovska 8, 34000 Kragujevac, Serbia

2. Faculty of Engineering, University of Kragujevac, Sestre Janjic 6, 34000 Kragujevac, Serbia

3. Faculty of Polytechnics, University of Donja Gorica, Donja Gorica, 81000 Podgorica, Montenegro

4. Faculty of Technical Sciences, University of Novi Sad, Trg Dositeja Obradovica 6, 21000 Novi Sad, Serbia

Abstract

Polypropylene is a widely used linear hydrocarbon polymer with diverse applications due to its exceptional physicochemical characteristics and minimal changes during the recycling process. Numerous studies have focused on factors influencing the mechanical properties of polypropylene and its application in composites. However, despite their significance in the agricultural industry, there is limited research on polypropylene baling twines. This study analyses the behaviour of polypropylene baling twine under tensile loading, exploring the influence of fibre friction and twisting angle on the material’s tensile strength. Experimental investigation indicated that tensile strength increases with twisting angle, but only until the angle reaches a critical value. Further increase in the twist angle led to a decrease in tensile strength. The increase in tensile strength is attributed to the rise in the coefficient of friction between fibres in the twine. An experimental approach was employed to evaluate the mechanical characteristics of the twine, including the effect of prestressing by twisting. Understanding these characteristics is crucial for enhancing the quality of polypropylene baling twines and optimising their application in the agricultural industry.

Publisher

MDPI AG

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