Simulation and verification of the secondary gas penetration in a gas-assisted-injection molded spiral tube

Chen, S.C.; Cheng, Nien-Tien; Hsu, K. S.

doi:10.1016/0735-1933(95)00023-r

Cited by 31 publications

(10 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…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

View full text Add to dashboard Cite

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.

show abstract

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

View full text Add to dashboard Cite

show abstract

“…The large rim thickness variation of glass fiber filled PBT may be attributed to the non-uniform cell structure. For the shrinkage rate [12], the average thickness of solid glass filled, foamed glass fiber filled, and foamed Wollastonite filled PBT is 6.004, 6.243, and 6.256 mm respectively. The thickness on the mold is 6.40 mm.…”

Section: The Effect Of Process Conditions On Rim Thickness Of the Texmentioning

confidence: 99%

Shrinkage study of textile roller molded by conventional/microcellular injection-molding process

Hwang

Hsu

Chiang

2008

International Communications in Heat and Mass Transfer

View full text Add to dashboard Cite

“…The advantages of the GAIM process include reduction in cycle time, part weight, shrinkage, warpage, injection pressure and clamping force, apart from improvement of the surface finish and elimination of sink marks [4][5][6] . Up to now, many studies focusing on the mathematic simulation [7][8][9][10][11][12][13][14] and experimental verification [15][16][17][18][19][20][21][22] of the process have been done during the past decade, while few publications concerning the relationship between the processing conditions and the mechanical properties of GAIM part can be found.…”

Section: Introductionmentioning

confidence: 99%

Gas-assisted Injection Molded Polypropylene/Glass Fiber Composite: Foaming Structure and Tensile Strength

Zheng

Shen

et al. 2009

Polymer-Plastics Technology and Engineering

View full text Add to dashboard Cite

Tensile strength of isotactic polypropylene (iPP)/glass fiber (GF) composites and neat iPP molded respectively by gas-assisted injection molding (GAIM) was examined. For comparison, tensile strength of the counterparts, which were molded by conventional injection molding (CIM) under the same processing conditions but without gas penetration, was also examined. Tensile strength of the CIM parts steadily increases with the increase of the GF content. For neat iPP molded by GAIM, as the gas pressure increases the tensile strength increases. However, for the iPP/GF composites, the tensile strength generally decreases when the gas pressure increases. And, at a given content of GF, tensile strength of the parts molded by GAIM is unexpectedly lower than that of the counterparts molded by CIM. At a given gas pressure, the higher the fiber content, the lower the tensile strength. In addition, scanning electron microscope (SEM) results show that foaming structure should be responsible for the poor tensile strength of the composites molded by GAIM. The poor adhesion between the glass fibers and the matrix and the unique properties of the gas used in GAIM process are the substantial factors in the formation of foaming structure.

show abstract

Simulation and verification of the secondary gas penetration in a gas-assisted-injection molded spiral tube

Cited by 31 publications

References 2 publications

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

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

Shrinkage study of textile roller molded by conventional/microcellular injection-molding process

Gas-assisted Injection Molded Polypropylene/Glass Fiber Composite: Foaming Structure and Tensile Strength

Contact Info

Product

Resources

About