Analysis and experimental study of gas penetration in a gas‐assisted injection‐molded spiral tube

Chen, S. C.; Hsu, K. F.; Hsu, K. S.

doi:10.1002/app.1995.070580412

Cited by 36 publications

(20 citation statements)

References 1 publication

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“…So far, most literatures mainly focused on the mathematic simulation of gas penetration, [4][5][6][7][8][11][12][13][14][15] the effect of the gas channel design on the gas penetration behavior, 3,4,6,16 molding window, 3,10,17 the influence of gas channel shape on the mechanical properties [18][19][20] and so on, while studies on the morphology development in GAIM part and the relationship between microstructure and macroproperties are limited. Chien 21 explored the influence of gas channel shape on the mechanical properties of GAIM moldings as well as the crystallnity of polyamide (PA), and found that maximum tensile load and ultimate tensile stress of PA moldings exhibited significant dependence on part thickness because of higher degree of crystallinity.…”

Section: Introductionmentioning

confidence: 99%

Morphology of gas‐assisted and conventional injection molded polycarbonate/polyethylene blend

Zheng

Yang

Yin

et al. 2006

J of Applied Polymer Sci

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The skin-core structure of the gas-assisted and conventional injection molded polycarbonate (PC)/polyethylene (PE) blend was investigated. The results indicated that both the size and the shape of the dispersed PC phase depended not only on the nature of PC/PE blend and molding parameters, but also on its location in the parts. Although the gas-assisted injection molding (GAIM) parts and conventional injection molding (CIM) part have the similar skin-core structure, the morphology evolution of PC phase in the GAIM moldings and the CIM moldings showed completely different characteristics. In the section perpendicular to the melt flow direction, the morphology of the GAIM moldings included five layers, skin intermediate layer, subskin, core layer, core intermediate layer as well as gas channel intermediate layer, according to the degree of deformation. PC phase changed severely in the core layer of GAIM moldings, as well as in the subskin of CIM moldings. In GAIM parts, PC phase in the core layer of the nongate end changed far more intensely and aligned much orderly than that in the gate end. The morphology of PC phase in the GAIM part molded with higher gas pressure changed more severe than that in the GAIM part molded with lower gas pressure. In a word, PC phase showed more obvious fibrillation in the GAIM moldings than that in the CIM moldings.

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Section: Introductionmentioning

confidence: 99%

Morphology of gas‐assisted and conventional injection molded polycarbonate/polyethylene blend

Zheng

Yang

Yin

et al. 2006

J of Applied Polymer Sci

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“…A high injection velocity will induce a higher shear rate and lead to a higher level of gross. However, the influence in the gas 6 Effect of mould temperature on glossy difference and chromatic aberration of PP GAIM parts with five different gas channel designs 7 Effect of melt temperature on glossy difference and chromatic aberration of PP GAIM parts with five different gas channel designs 8 a X-ray diffraction pattern for gas channel and plate under mould temperature 40uC; b X-ray diffraction pattern for gas channel and plate under mould temperature 60uC channel is less significant because of its large dimensions and the associated shear rate and the degree of crystallinity is lower. Consequently, when the injection velocity is increased, the gloss increase in the gas channel and flat plate is different leading to larger gross differences (Fig.…”

Section: Resultsmentioning

confidence: 98%

Investigations into surface visual quality of gas-assisted injection moulded polypropylene parts

Chien¹,

Chen²

2004

Plastics, Rubber and Composites

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Although gas-assisted injection moulding (GAIM) provides many advantages compared with conventional injection moulding (CIM), its applications are limited to surface visual quality studies. In the present study, polypropylene plate parts designed with gas channels having five different types of cross-section but with same cross-sectional area were gas-assisted injection moulded. In addition, various plate thickness parts designed with semicircular gas channels of different radius were also moulded. The surface visual quality of GAIM parts was investigated via gloss and chromatics measurements. The effects of processing parameters and geometrical factors, introduced by part thickness, shape and associated dimensions of gas channels on glossy difference and chromatic aberration of GAIM parts were investigated. The effect on the surface visual quality of gas channel with fillet design and cavity surface with texturing treatment was also examined. It was found that glossy difference is very sensitive to the degree of crystallinity whereas gas channel residual skin melt thickness plays a dominant factor for chromatic aberration. The processing conditions significantly affect surface visual quality. Gas channel design of semicircular cross-section (shape A) provides a better surface visual quality than the other designs. In addition, in order to obtain best surface visual quality, the ratio of equivalent radius to plate thickness should be approximately equal to 2 . 3. Alternatively, surface visual quality can be improved by texturing treatment on the cavity surface of the core-side. The present study provided part design guidelines for choosing the most effective gas channel design to achieve the best surface visual quality.

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“…Cornell University, in collaboration with the AC Company of the USA, used the C-Mold software to investigate the structural analysis of GAIM products [1]. Chen et al [2] studied the one dimension flow characteristics of the mold to measure the extension of the hollow rate of products depending on the mold and on melt temperatures. Soh and Chung [3] used the pressure gradient with the steady-state flow equation to predict the direction of gas penetration.…”

Section: Introductionmentioning

confidence: 99%

Self-Organizing Fuzzy Controller for Gas-Assisted Injection Molding Combination Systems

Lin

Lian

2010

IEEE Trans. Contr. Syst. Technol.

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This study designed and constructed a gas-assisted injection molding system and incorporated it into a traditional injection molding machine. This combined system was referred to as the "gas-assisted injection molding combination system" (GAIMCS). The GAIMCS has complicated and uncertain dynamics, so it is impractical to design model-based controllers for this kind of system. To address this problem, this work developed a model-free selforganizing fuzzy controller (SOFC) to control the GAIMCS and evaluated its control performance. The SOFC has learning ability, which can regulate fuzzy control rules in real time during the control process. The initial fuzzy control rules for the SOFC can be set to zero before the onset of learning. The SOFC achieved better control performance than the fuzzy logic controller or the proportional-integral-derivative controller for high-pressure gas control in the GAIMCS, as confirmed by the experimental results.Index Terms-Fuzzy logic controller, gas-assisted injection molding, self-organizing fuzzy controller.

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Analysis and experimental study of gas penetration in a gas‐assisted injection‐molded spiral tube

Cited by 36 publications

References 1 publication

Morphology of gas‐assisted and conventional injection molded polycarbonate/polyethylene blend

Morphology of gas‐assisted and conventional injection molded polycarbonate/polyethylene blend

Investigations into surface visual quality of gas-assisted injection moulded polypropylene parts

Self-Organizing Fuzzy Controller for Gas-Assisted Injection Molding Combination Systems

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