The Influence of the Processing Conditions on Changes in Physical and Structural Properties of Injection Moulded Parts Made of Polypropylene

• Autorzy: Palutkiewicz Paweł , Kalwik Aleksandra , Jaruga Tomasz

Identyfikatory

DOI

10.24425/amm.2023.146217

• Języki publikacji: EN

Abstrakty

EN

The injection moulding conditions may change the degree of crystallinity of the plastic to some extent, which affects the mechanical properties such as tensile strength and hardness. Moreover, the cooling conditions of the moulded parts may contribute to changes in their shrinkage. The paper presents the results of determination of the melting enthalpy of a polypropylene. The melting enthalpy ∆H_m was determined by differential scanning calorimetry. It was found, that the value of the melting enthalpy depends on the physical conditions prevailing during the sample production process, such as the temperature of the liquid material, the cooling rate of the plastic (related to the mould temperature T_m) and the flow rate of the plastic in the mould. The degree of crystallinity of the obtained samples was also determined, which, depending on the measured enthalpy of fusion, influences the degree of structural order of the polymer. Standardized test samples were also analysed in terms of transversal shrinkage and longitudinal shrinkage. The shrinkage of the injection moulded parts results from the change of physical state of plastic during its solidification in the mould.

Słowa kluczowe

EN

injection moulding; polypropylene; shrinkage; degree of crystallinity

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2023
• Tom: Vol. 68, iss. 4
• Strony: 1513--1518
• Opis fizyczny: Bibliogr. 30 poz., fot., rys., tab.

Twórcy

autor

Palutkiewicz Paweł

• Czestochowa University of Technology, Faculty of Mechanical Engineering and Computer Science, Department of Technology and Automation, 19C Armii Krajowej Av., 42- 201 Czestochowa, Poland

• https://orcid.org/0000-0002-7179-6881

autor

Kalwik Aleksandra

• Czestochowa University of Technology, Faculty of Mechanical Engineering and Computer Science, Department of Technology and Automation, 19C Armii Krajowej Av., 42- 201 Czestochowa, Poland

• https://orcid.org/0000-0003-1636-5111

autor

Jaruga Tomasz

• Czestochowa University of Technology, Faculty of Mechanical Engineering and Computer Science, Department of Technology and Automation, 19C Armii Krajowej Av., 42- 201 Czestochowa, Poland

• https://orcid.org/0000-0001-9958-1826

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa nr POPUL/SP/0154/2024/02 w ramach programu "Społeczna odpowiedzialność nauki II" - moduł: Popularyzacja nauki (2025)