Influence of insert component position and geometry on shrinkage in thermoplastic insert molding

Zeppenfeld, M.; Müller, Bettina; Heyl, Sophia

doi:10.1063/1.5121658

Cited by 3 publications

(2 citation statements)

References 10 publications

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“…Final shrinkage is usually measured at a given time after manufacturing. The interval is given by the customer or an appropriate standard [ 6 , 7 , 8 ]. In order to describe the effects occurring during the contracting phase, pVT diagrams are used, including pressure (p), volume (V), and temperature (T) [ 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Injection-Molded Isotactic Polypropylene Colored with Green Transparent and Opaque Pigments

Janostik

Senkerik

Maňas

et al. 2023

IJMS

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Polypropylene (PP) belongs among the most important commodity plastics due to its widespread application. The color of the PP products can be achieved by the addition of pigments, which can dramatically affect its material characteristics. To maintain product consistency (dimensional, mechanical, and optical), knowledge of these implications is of great importance. This study investigates the effect of transparent/opaque green masterbatches (MBs) and their concentration on the physico-mechanical and optical properties of PP produced by injection molding. The results showed that selected pigments had different nucleating abilities, affecting the dimensional stability and crystallinity of the product. The rheological properties of pigmented PP melts were affected as well. Mechanical testing showed that the presence of both pigments increased the tensile strength and Young’s modulus, while the elongation at break was significantly increased only for the opaque MB. The impact toughness of colored PP with both MBs remained similar to that of neat PP. The optical properties were well controlled by the dosing of MBs, and were further related to the RAL color standards, as demonstrated by CIE color space analysis. Finally, the selection of appropriate pigments for PP should be considered, especially in areas where dimensional and color stability, as well as product safety, are highly important.

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Section: Introductionmentioning

confidence: 99%

Injection-Molded Isotactic Polypropylene Colored with Green Transparent and Opaque Pigments

Janostik

Senkerik

Maňas

et al. 2023

IJMS

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“…Some strategies that have been investigated for improving the T-RTM process focused on the highly reactive nature of the resins and their sensibility to moisture and oxygen content, which can affect the polymerization and quality of the materials produced. Wendel et al [ 15 , 16 , 17 ] studied the influence of moisture on APA6 properties. By adding water to the reactive system, the authors observed that moisture hinders the polymerization reaction, causing a decrease in the monomer conversion degree, maximum tensile strength and Young’s modulus of the produced parts.…”

Section: Introductionmentioning

confidence: 99%

Reproducibility Study of the Thermoplastic Resin Transfer Molding Process for Glass Fiber Reinforced Polyamide 6 Composites

et al. 2023

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Polyamide 6 (PA6) thermoplastic composites have higher recyclability potential when compared to conventional thermoset composites. A disruptive liquid molding manufacturing technology named Thermoplastic Resin Transfer Molding (T-RTM) can be used for processing composites due to the low viscosity of the monomers and additives. In this process, polymerization, crystallization and shrinkage occur almost at the same time. If these phenomena are not controlled, they can compromise the reproducibility and homogeneity of the parts. This work studied the influence of packing pressure, as a process variable, throughout the filling and polymerization stages. To assess the process reproducibility and parts’ homogeneity, physical, thermal and mechanical properties were analyzed in different areas of neat PA6 and composite parts. This study showed that a two-stage packing pressure can be successfully used to increase parts’ homogeneity and process reproducibility. The use of 3.5 bar packing pressure during the polymerization stage resulted in mechanical properties with lower standard deviations, indicating a higher degree of homogeneity of the manufactured parts and higher process reproducibility. These results will be used for establishing the actual state of the technology and will be a base for future process optimization.

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Manufacturing and impact behaviour of aeronautic overmolded grid-stiffened thermoplastic carbon plates

Neveu

Cornu

Olivier

et al. 2022

Composite Structures

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Influence of insert component position and geometry on shrinkage in thermoplastic insert molding

Cited by 3 publications

References 10 publications

Injection-Molded Isotactic Polypropylene Colored with Green Transparent and Opaque Pigments

Injection-Molded Isotactic Polypropylene Colored with Green Transparent and Opaque Pigments

Reproducibility Study of the Thermoplastic Resin Transfer Molding Process for Glass Fiber Reinforced Polyamide 6 Composites

Manufacturing and impact behaviour of aeronautic overmolded grid-stiffened thermoplastic carbon plates

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