Passive mold temperature control by a hybrid filming-microcellular injection molding processing

Chen, Shia‐Chung; Li, Haimei; Hwang, Shyh‐Shin; Wang, Ho-Hsiang

doi:10.1016/j.icheatmasstransfer.2008.03.013

Cited by 42 publications

(25 citation statements)

References 17 publications

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“…For direct heating of the mold surface, a coating on the cavity surface consisting of TiN and Teflon has been shown to reduce the heat transfer from the melt to the mold material, increasing the temperature on the cavity surface by 25°C [10,11]. Similarly, an electromagnetic induction coil has been used to heat the cavity surface to reduce the weld line, shrinkage, and other defects of the part surface [12,13].…”

Section: Introductionmentioning

confidence: 99%

Gas-assisted mold temperature control for improving the quality of injection molded parts with fiber additives

Chen

Minh

Chang

2011

International Communications in Heat and Mass Transfer

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Section: Introductionmentioning

confidence: 99%

Gas-assisted mold temperature control for improving the quality of injection molded parts with fiber additives

Chen

Minh

Chang

2011

International Communications in Heat and Mass Transfer

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“…Sometime even far away from the gate, there's a compelling flow under a low temperature and still high shear rate condition on skin layer, swirl surface is still formed. [8] Fig.3 Swirl Streak for Interface Roughness [8] Methods to Improve Surface Quality Different methods are used to improve surface quality of microcellular foam injection molded parts. There are two main approaches.…”

Section: Swirl Mechanismmentioning

confidence: 99%

Microcellular Foam Injection Molding Surface Improvement Methods

Lu¹,

2016

Proceedings of the 2nd Annual International Conference on Advanced Material Engineering (AME 2016)

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“…The appearance of silver (or swirl) marks on the surfaces of FIM parts is common, deteriorating their cosmetic properties . The formation of these blemishes is attributed to gas cells trapped between the mold surface and the melt/gas mixture.…”

Section: Introductionmentioning

confidence: 99%

Identification of cell‐nucleation mechanism in foam injection molding with gas‐counter pressure via mold visualization

et al. 2016

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The mechanisms of cell nucleation and growth are investigated in foam injection molding (FIM) using gas-counter pressure (GCP). An in-situ mold visualization technique is employed. The application of GCP suppresses cell nucleation, and prevents the blowing agent from escaping during mold-filling. The inherent structural heterogeneity in the regular FIM can be improved because of the uniform cavity pressure when employing GCP. The cavity pressure profiles show much faster pressure-drop rates using GCP, because the single-phase polymer/gas mixture has a lower compressibility than the two-phase polymer/bubble mixture. Therefore, both the cell nucleation and growth rates are significantly increased through a higher pressure-drop rate on the removal of the GCP. The effect of GCP magnitude on the cell morphology is explored. When the GCP is lower than the solubility pressure, bimodal foaming occurs. As the GCP increases above the solubility pressure, the cell density increases because of the higher pressure-drop rate. Figure 14. Formation of a bimodal structure as a result of an insufficient GCP of 2.30 MPa (injection speed: 35 cm 3 s 21 ; CO 2 : 1%; T melt 5 230 C).

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Passive mold temperature control by a hybrid filming-microcellular injection molding processing

Cited by 42 publications

References 17 publications

Gas-assisted mold temperature control for improving the quality of injection molded parts with fiber additives

Gas-assisted mold temperature control for improving the quality of injection molded parts with fiber additives

Microcellular Foam Injection Molding Surface Improvement Methods

Identification of cell‐nucleation mechanism in foam injection molding with gas‐counter pressure via mold visualization

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