Effects of cavity surface temperature on reinforced plastic part surface appearance in rapid heat cycle moulding

Wang, Guilong; Zhao, Guoqun; Wang, Xiaoxin

doi:10.1016/j.matdes.2012.08.039

Cited by 39 publications

(17 citation statements)

References 37 publications

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“…An increase in the mold temperature enhanced the overall surface gloss. This result agrees with the previous research [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 ]. At a high mold temperature ( T cool of 70 °C), the surface shows the highest surface gloss value in Figure 12 .…”

Section: Resultssupporting

confidence: 94%

“…Molding conditions enhancing the mold surface replication have been recommended to eliminate surface defects and increase surface gloss. High mold temperature has been suggested as the main parameter influencing the surface gloss because the formation of a frozen layer is affected by the temperature condition [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 ]. High cavity or packing pressure [ 1 , 2 , 4 , 8 , 10 , 11 ] and injection speed [ 1 , 2 , 10 , 11 ] increase the surface gloss but have a less significant effect compared to the mold temperature [ 2 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

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Causes of the Gloss Transition Defect on High-Gloss Injection-Molded Surfaces

et al. 2020

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The gloss transition defect of injection-molded surfaces should be mitigated because it creates a poor impression of product quality. Conventional approaches for the suppression of the gloss transition defect employ a trial-and-error approach and additional equipment. The causes of the generation of a low-gloss polymer surface and the surface change during the molding process have not been systematically analyzed. This article proposes the causes of the generation of a low-gloss polymer surface and the occurrence of gloss transition according to the molding condition. The changes in the polymer surface and gloss were analyzed using gloss and topography measurements. The shrinkage of the polymer surface generates a rough topography and low glossiness. Replication to the smooth mold surface compensates for the effect of surface shrinkage and increases the surface gloss. The surface stiffness and melt pressure influence the degree of mold surface replication. The flow front speed and mold temperature are the main factors influencing the surface gloss because they affect the development rate of the melt pressure and the recovery rate of the surface stiffness. Therefore, the mold design and process condition should be optimized to enhance the uniformity of the flow front speed and mold temperature.

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Section: Resultssupporting

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Causes of the Gloss Transition Defect on High-Gloss Injection-Molded Surfaces

et al. 2020

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“…Furthermore, they presented the effect of fiber orientation in the confluent region on the impact strength of resultant parts. Wang et al [26] used two reinforced plastics including ABS/PMMA/nano-CaCO 3 and 20% fiber-reinforced polypropylene to investigate the influence of cavity surface temperature immediately before filling on the surface appearance and texture of the molded reinforced plastic parts using the RHCM. e roughness, gloss, and morphology of the surface are characterized with white light interferometer, gloss meter, and optical microscope, respectively.…”

Section: Introductionmentioning

confidence: 99%

Microstructure, Tensile Property, and Surface Quality of Glass Fiber-Reinforced Polypropylene Parts Molded by Rapid Heat Cycle Molding

Liu

et al. 2020

Advances in Polymer Technology

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The microstructure of a molded product considerably influences its macroscopic properties. In this study, the influence of molding process on microstructure, tensile property, and surface quality was explored on the glass fiber-reinforced polypropylene (GFRPP) parts molded by rapid heat cycle molding (RHCM) and conversion injection molding (CIM). Tensile strength and surface gloss were chosen to measure macroscopic properties of the molded parts. The microstructure including multilayer, fiber orientation, crystallinity, and fiber-matrix bonding strength were analyzed by simulations, scanning electron microscopy, wide-angle X-ray diffraction, and dynamic mechanical analysis. The relationship between the macroscopic properties and microstructure of the RHCM samples was also discussed. The results indicate that as the mold cavity surface temperature increases, the tensile strength increases firstly and decreases thereafter. The tensile strength of RHCM parts reached the maximum at the mold heating temperature of 60°C. It is also observed that the surface gloss of the sample increases as the mold cavity surface temperature rises, and the increase of surface gloss decreases distinctly with the mold heating temperature higher than 90°C.

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“…Such reduction tendency can be interpreted from the point of view of the distribution of the reinforced particles of nano-C a CO 3 . With T cs increase, the reinforced particles in the surface layer will reduce gradually and tend to gather to the central region of the specimen [13]. As shown in Fig.…”

Section: Impact Strengthmentioning

confidence: 92%

“…The molding systems were also optimized for improving thermal cycling efficiency in RHCM [11,12]. The effects of RHCM process on part surface quality were investigated [13,14]. It was revealed that a high cavity surface temperature close to glass transition temperature of the polymer can significantly reduce surface roughness, greatly increase surface gloss and also eliminating weld line.…”

Section: Introductionmentioning

confidence: 99%