Injectin molding of short fiber reinforced thermoplastics in a center‐gated mold

Larsen, Åge

doi:10.1002/pc.10164

Cited by 18 publications

(13 citation statements)

References 20 publications

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“…7 where most of the fibers were seen lying in the LW plane. The ratio of f T :f L :f W is consistent with the injection molded samples reported in the literature [22,23].…”

Section: Fiber Characterizationsupporting

confidence: 90%

Improved through‐plane electrical conductivity in a carbon‐filled thermoplastic via foaming

Motlagh

Hrymak

Thompson

2008

Polymer Engineering & Sci

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Flow-induced orientation of the conductive fillers in injection molding creates parts with anisotropic electrical conductivity where through-plane conductivity is several orders of magnitude lower than in-plane conductivity. This article provides insight into a novel processing method using a chemical blowing agent to manipulate carbon fiber (CF) orientation within a polymer matrix during injection molding. The study used a fractional factorial experimental design to identify the important processing factors for improving the through-plane electrical conductivity of plates molded from a carbon-filled cyclic olefin copolymer (COC) containing 10 vol% CF and 2 vol% carbon black. The molded COC plates were analyzed for fiber orientation, morphology, and electrical conductivity. With increasing porosity in the molded foam part, it was found that greater out-of-plane fiber orientation and higher electrical conductivity could be achieved. Maximum conductivity and fiber reorientation in the through-plane direction occurred at lower injection flow rate and higher melt temperature. These process conditions correspond with foam flow during filling of the mold cavity, indicating the importance of shear stress on the effectiveness of a fiber being rotated out-of-plane during injection molding.

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“…7 where most of the fibers were seen lying in the LW plane. The ratio of f T :f L :f W is consistent with the injection molded samples reported in the literature [22,23].…”

Section: Fiber Characterizationsupporting

confidence: 90%

Improved through‐plane electrical conductivity in a carbon‐filled thermoplastic via foaming

Motlagh

Hrymak

Thompson

2008

Polymer Engineering & Sci

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“…As shown in Figure 5, it was found that there were two distinct regions with different fiber alignments across the thickness of non-weld-line specimens. This also had been identified by several other studies [10][11][12][13][14] .…”

Section: Resultsmentioning

confidence: 55%

The Effect of Thickness on the Weld-Line Strength of Injection-Molded Thermoplastic Composites

Patcharaphun

Jariyatammanukul

2010

Polymer-Plastics Technology and Engineering

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Weld lines are a major concern to designers since they result in poor mechanical properties. Designers may overdesign parts when considering anticipated failure modes and safety factors by locating weld lines in non-critical areas without taking into account material factors. This study focus on the effect of part thickness on the weldline strength of injection-molded short-fiber-reinforced thermoplastic composites. Comparisons were made with specimens without weld lines. The use of design data which takes into account fiber orientation and part thickness will enable designers to more accurately predict the performance of an injection-molded thermoplastic composites under applied load.

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“…The results of the first set Comparing the micrographs reveals the difference in the state of fiber orientation between Case I and Case II. The unique feature of this set of experiments is that all the process conditions for the two Cases were the same during the flow of melt in the cavity number 2; such that in contrast to many studies [2][3][4]19] the difference in the state of fiber orientation in these two Cases cannot be attributed to any properties of melt in filling state.…”

Section: Resultsmentioning

confidence: 99%

Effect of packing pressure on fiber orientation in injection molding of fiber‐reinforced thermoplastics

Shokri

Bhatnagar

2007

Polymer Composites

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Injection molding of fiber-reinforced polymeric composites is increasing with demands of geometrically complex products possessing superior mechanical properties of high specific strength, high specific stiffness, and high impact resistance. Complex state of fiber orientation exists in injection molding of short fiber reinforced polymers. The orientation of fibers vary significantly across the thickness of injection-molded part and can become a key feature of the finished product. Improving the mechanical properties of molded parts by managing the orientation of fibers during the process of injection molding is the basic motivation of this study. As a first step in this direction, the present results reveal the importance of packing pressure in orienting the fibers. In this study, the effects of pressure distribution and viscosity of a compressible polymeric composite melt on the state of fiber orientation after complete filling of a cavity is considered experimentally and compared with the simulation results of Moldflow analysis. POLYM. COMPOS., 28:214 -223, 2007.

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Injectin molding of short fiber reinforced thermoplastics in a center‐gated mold

Cited by 18 publications

References 20 publications

Improved through‐plane electrical conductivity in a carbon‐filled thermoplastic via foaming

Improved through‐plane electrical conductivity in a carbon‐filled thermoplastic via foaming

The Effect of Thickness on the Weld-Line Strength of Injection-Molded Thermoplastic Composites

Effect of packing pressure on fiber orientation in injection molding of fiber‐reinforced thermoplastics

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