Characterization of processing parameters for injection molding of thermoplastics and thermosetting plastics using thermal analysis

Kunze, Wolfgang; Möhler, H.

doi:10.1016/0040-6031(85)85792-0

Cited by 3 publications

(2 citation statements)

References 1 publication

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“…In terms of microstructure the previous is a normal behavior, since the crystallization inside the injection mold is conducted mainly by dynamics conditions of temperature, where both mold and melt temperature strongly influence the crystallization process, modifying the degree of crystallinity in the final injected part. Kunze et al observed that by increasing the mold temperature, the enthalpy of fusion increases and this behavior is reasonable since the crystals can form better. As known, during injection molding, semicrystalline polymers solidify with different structures along the thickness of the molded part. ,,, Near the center of the piece where the shear stresses are relatively low, the polymer crystallizes with a spherical morphology called spherulite.…”

Section: Resultsmentioning

confidence: 98%

Effect of Molding Parameters on Young’s Modulus of an Injection Molded Low-Density Polyethylene (LDPE)

Leyva‐Porras

Esneider-Alcalá

Toxqui-Terán

et al. 2013

Ind. Eng. Chem. Res.

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Injection molding is a process employed worldwide to manufacture polymer parts. The final properties of the molded part largely depend on the processing conditions used during the manufacturing process. Therefore, it is necessary to develop empirical approaches that help to understand the relationship between the processing conditions and the final properties of the polymer. In this paper we study the effect of the processing conditions of the injection molding process on the Young’s modulus of a low-density polyethylene (LDPE). The effect of both the barrel temperature and the mold temperature was investigated using analysis of variance (ANOVA) and the effect of the levels of each parameter was examined using the surface response methodology (SRM). The ANOVA results showed that the mold temperature is the parameter that most significantly impacts the Young’s modulus, followed by the barrel temperature, while the combined interaction of both is negligible. SRM showed that the Young’s modulus increases with the mold temperature and decreases with the barrel temperature. Based on the SRM, an empirical equation is proposed which can be used to predict the modulus employing only the barrel and mold temperatures. The changes in the microstructure of the injection molded part are discussed in terms of the crystallinity degree. All this was corroborated with X-ray diffraction (XRD) and differential scanning calorimetry (DSC).

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Section: Resultsmentioning

confidence: 98%

Effect of Molding Parameters on Young’s Modulus of an Injection Molded Low-Density Polyethylene (LDPE)

Leyva‐Porras

Esneider-Alcalá

Toxqui-Terán

et al. 2013

Ind. Eng. Chem. Res.

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“…It is expected that the amount of nucleating sites is increasing as the mold temperature increases. Kunz and Möhler found that the enthalpy of fusion increases with increasing mold temperature. It is thus suggested that larger crystals are formed preferentially.…”

Section: Resultsmentioning

confidence: 99%

Impact of compression molding conditions on the thermal and mechanical properties of polyethylene

Shamloo

Fathi

Elkoun

et al. 2017

J of Applied Polymer Sci

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Compression molding is a current technique in polymer processing. Despite numerous studies, effect of molding pressure on physical properties has surprisingly not been fully investigated. In this study, the thermal and mechanical behavior of the compression-molded polyethylene were thus explored to better grasp the relationship between processing parameters and ensuing properties. The effect of the molding temperature, pressure, cooling rate, and temperature profile on the tensile and flexural moduli as well as melting point of polyethylene was studied. We conclude that higher tensile and flexural moduli are obtained by increasing pressure and molding temperature, as well as decreasing the cooling rate. Our results were corroborated by X-ray diffraction and differential scanning calorimetry measurements. Moreover, the use of a temperature gradient with different temperatures for the upper and bottom plates of the mold leads to asymmetric samples whose tensile and flexural moduli are improved. V C 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46176.

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Manufacturing defects of woven natural fibre thermoset composites

Abdan

Lee

Humaira

2022

Physical Sciences Reviews

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Thermoset polymer are components with high strength, chemical inert and thermally stable, due to its high degree of cross-linking. Natural fibre composite is providing a winning solution for extraordinary performances yet biodegradable. Woven form fibre even found better in specific energy absorption and stronger in strength. Fabricating woven thermoset composites may be done in a variety of ways. However, processing errors or manufacturing defects often occur by many factors, especially thermoset composites with natural fibre reinforcement. It is nearly impossible to achieves in detect-free when in lab scale production. Hence, it is important to study and understand the factors that causing the defects. Processing parameters, compatibility of matrix/fibre combination, yarn production and woven waiving skills may be the reasons of composite’s defects. In this chapter, several fabrication methods for woven thermoset composite were introduced. Some major defects on manufacturing the thermoset composites were highlighted. Some future perception of the woven natural fibre thermoset composite also have been discussed. This chapter set as a guidance to avoid or minimizes manufacturing defects upon thermoset composite processing.

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Characterization of processing parameters for injection molding of thermoplastics and thermosetting plastics using thermal analysis

Cited by 3 publications

References 1 publication

Effect of Molding Parameters on Young’s Modulus of an Injection Molded Low-Density Polyethylene (LDPE)

Effect of Molding Parameters on Young’s Modulus of an Injection Molded Low-Density Polyethylene (LDPE)

Impact of compression molding conditions on the thermal and mechanical properties of polyethylene

Manufacturing defects of woven natural fibre thermoset composites

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