A study of rib geometry for gas‐assisted injection molding

Yang, Sen; Huang, Feng-Chi; Liau, Wen-Rong

doi:10.1002/pen.10683

Cited by 25 publications

(15 citation statements)

References 7 publications

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“…The gas injection system consisted of a nitrogen tank, pressure regulators, valves, a solenoid, and a controller for gasinjection delay control. The gas pressure was reg- 15 ulated with a pressure regulator (TKR-100, Japan). When the valve was opened by the solenoid, the gas with regulated pressure was injected through the injection needles in the cavity.…”

Section: Methodsmentioning

confidence: 99%

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Void shape in gas-channel ribs in gas-assisted injection-molded plates

Yang¹

1999

Adv. Polym. Technol.

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Section: Methodsmentioning

confidence: 99%

“…These aforementioned analyses have not systematically covered most rib geometry. Yang et al systematically investigated the effect 15 of rib geometry, including aspect ratio and fillet geometry, on GAIM. They found that increasing the rib width widens the allowable operation range and thus improves the moldability.…”

Section: Introduction Lmentioning

confidence: 99%

Void shape in gas-channel ribs in gas-assisted injection-molded plates

Yang¹

1999

Adv. Polym. Technol.

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“…Based on previous studies on short-shot GAIM 6,13,17,20 and the present study on full-shot GAIM, it may be illuminating to compare these three processes based on the following aspects. FIGURE 11.…”

Section: Discussion Of the Molding Of Rib-strengthened Large Plates Wmentioning

confidence: 94%

“…Many GAIM experiments have used polystyrene. 5,6,12,13 The processibility of polystyrene is excellent. Its transparency simplifies observation of gas penetration.…”

Section: Machine Gas Injection Unit Mold and Materialsmentioning

confidence: 99%

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Secondary gas penetrations in ribs during full‐shot gas‐assisted injection molding

2003

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Although gas-assisted injection molding (GAIM) eliminates sink marks and prevents warpage, many problems are encountered during gas-assisted filling owing to gas-melt flow interactions. Large voids created by gas penetration during gas-assisted filling result in degraded rigidity. To avoid gas-assisted filling, the shot weight is increased to 100%. Gas is injected after the cavity is completely filled. The so-called "full-shot gas-assisted injection molding" process is investigated in this paper. The effects of the processing conditions and rib geometry on the behavior of gas penetration are systematically investigated. High melt temperature and a short gas injection delay time are found to increase the length of gas penetration during full-shot GAIM. Wide ribs and ribs with fillets cause the gas penetration length to decrease. Although the mechanisms of gas penetration for short-shot and full-shot GAIMs are not identical, the resulting penetration patterns of the gas void shape are similar.

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Computer simulation of the filling process in gas‐assisted injection molding based on gas‐penetration modeling

Zhou¹,

Li²

2003

J of Applied Polymer Sci

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Gas-assisted injection molding can effectively produce parts free of sink marks in thick sections and free of warpage in long plates. This article concerns the numerical simulation of melt flow and gas penetration during the filling stage in gas-assisted injection molding. By taking the influence of gas penetration on the melt flow as boundary conditions of the melt-filling region, a hybrid finite-element/finite-difference method similar to conventional-injection molding simulation was used in the gasassisted injection molding-filling simulation. For gas penetration within the gas channel, an analytical formulation of the gas-penetration thickness ratio was deduced based on the matching asymptotic expansion method. Finally, an experiment was employed to verify this proposed simulation scheme and gas-penetration model, by comparing the results of the experiment with the simulation.

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A study of rib geometry for gas‐assisted injection molding

Cited by 25 publications

References 7 publications

Void shape in gas-channel ribs in gas-assisted injection-molded plates

Void shape in gas-channel ribs in gas-assisted injection-molded plates

Secondary gas penetrations in ribs during full‐shot gas‐assisted injection molding

Computer simulation of the filling process in gas‐assisted injection molding based on gas‐penetration modeling

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