An experimental investigation of the effects of hot runner system on injection moulding process in comparison with conventional runner system

Demirer, Ahmet; Soydan, Yavuz; Kaptı, Akın Oğuz

doi:10.1016/j.matdes.2006.03.015

Cited by 23 publications

(8 citation statements)

References 7 publications

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“…In a similar way, Jafairan and Shakeri [6] have investigated the influence of different process conditions for shrinkage of injection-molding parts. In addition, Demirer et al [7] have performed an experimental study that investigates the effects of shrinkage in an injected-molded part using acrylonitrile butadiene styrene (ABS) polymer material. Kurt et al [8] focused on the influence of the process conditions on shrinkage for the overall quality of produced parts with the ABS polymer material.…”

Section: Introductionmentioning

confidence: 99%

Optimum process conditions on shrinkage of an injected-molded part of DVD-ROM cover using Taguchi robust method

Öktem

2011

Int J Adv Manuf Technol

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Plastic injection molding is an important process to produce thin-shell parts. However, the difficulty in adjusting optimum process conditions may cause defects of the injectedmolded parts such as shrinkage. This study investigates on the optimum combinations of process conditions on shrinkage of an injected-molded part of the DVD-ROM cover based on Taguchi method. In doing this, a series of Moldflow analyses have been performed as per L 27 orthogonal array design with each analysis by means of the process conditions of mold temperature, melt temperature, injection pressure, injection time, and cooling time. In the meantime, signal-to-noise (S/N) ratio is utilized to determine the optimum combinations of the process conditions for shrinkage through analysis of variance (ANOVA). ANOVA is further used to find which of the process conditions are statistically significant. Finally, confirmation tests at the optimum combinations of the process conditions were executed to verify the robustness and the effectiveness of Taguchi method within 95% confidence interval. From the findings, it can be stated that Taguchi method is a powerful tool for evaluating the defect of shrinkage in the plastic injection molding.

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Section: Introductionmentioning

confidence: 99%

Optimum process conditions on shrinkage of an injected-molded part of DVD-ROM cover using Taguchi robust method

Öktem

2011

Int J Adv Manuf Technol

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“…These molds lead to the reduction of production costs by saving material of the nonrequired gating system and by shortening the cycle time. Furthermore, lower injection pressure is required, the process temperature is controllable with greater precision, more uniform filling is achievable in multicavity molds, and thus, the final mechanical properties of the moldings are improved [1].…”

Section: Introductionmentioning

confidence: 99%

Impact properties and microhardness of double‐gated glass‐reinforced polypropylene injection moldings

Gamba

Pouzada

Frontini

2009

Polymer Engineering & Sci

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Injection moldings with weld lines were produced in glass reinforced polypropylene grades differing in filler content using a two‐gated hot runner injection mold. The skin‐core microstructure developed during injection molding was qualitatively analyzed by means of optical and scanning electronic microscopy techniques. The load bearing capacity of the moldings was assessed by uniaxial tensile‐impact and biaxial instrumented falling dart impact tests. Microhardness was also used to ascertain the possibility of using it as a simple nondestructive technique for characterizing glass fiber‐reinforced injection moldings. The properties were monitored at various points to evaluate their variation at the bulk and the knit region. The biaxial impact test highlights the 10‐fold reduction of the impact strength caused by the weld line. POLYM. ENG. SCI., 2009. © 2009 Society of Plastics Engineers

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“…These molds lead to the reduction of production costs by saving material of the nonrequired gating system and by shortening the cycle time. Furthermore lower injection pressure is required, the process temperature is controllable with greater precision, more uniform filling is achievable in multi‐impression molds, and thus, the final mechanical properties of the moldings are improved [14]. In the mold used, the two gates that are equidistant from the mold axis generate a weld line in the centre of the molding, allowing studying also the effect of weld lines on part performance.…”

Section: Methodsmentioning

confidence: 99%

Uni‐ and biaxial impact behavior of double‐gated nanoclay‐reinforced polypropylene injection moldings

Pettarín

Viau

Fasce

et al. 2012

Polymer Engineering & Sci

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Polypopylene/nanoclay three-dimensional parts were produced without intermediate steps by direct injection molding to explore the influence of flow features and nanoclay incorporation in their impact performance. The nanocomposite was obtained by direct compounding of commercial PP with nanoclay masterbatch. The as-molded morphology was analyzed by X-ray and TEM analyses in terms of skin-core structure and nanoclay particle dispersion. The nanoclay particles induced the reduction of b-form spherulites, a known toughener. The impact behavior was assessed in tensile and biaxial modes. The PP nanocomposite molding toughness was practically unaffected by the processing melt temperature and flow rate. Conversely the nanoclay presence is influent in the impact performance. Under biaxial stress impact, the regions close to weld lines are tougher than the bulk and the fracture develops with main crack paths along the flow direction and the weld line. Cracking along the weld line results from less macromolecular interpenetration and chain entanglement, and unfavorable nanoparticle orientation. It seems that a failure mechanism which involves nanoclay delamination and multiple matrix crazing explains the toughening of PP in the directions where the nanoparticle orientation with respect to loading is adequate. POLYM. ENG. SCI., 53:724-733, 2013. FIG. 7. Depth sensing indentation results. (a) Typical indentation load-penetration depth curves for PP-6 sample in the skin and core. (b) Er and H profiles through the thickness for PP-6 sample. (c) Average values of Er as a function of MB content in the skin and core. (d) Average values of H as a function of MB content in the skin and core. [Color figure can be viewed in the online issue, which is available at wileyonlinelibrary.com.]

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An experimental investigation of the effects of hot runner system on injection moulding process in comparison with conventional runner system

Cited by 23 publications

References 7 publications

Optimum process conditions on shrinkage of an injected-molded part of DVD-ROM cover using Taguchi robust method

Optimum process conditions on shrinkage of an injected-molded part of DVD-ROM cover using Taguchi robust method

Impact properties and microhardness of double‐gated glass‐reinforced polypropylene injection moldings

Uni‐ and biaxial impact behavior of double‐gated nanoclay‐reinforced polypropylene injection moldings

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