A review of current advancements in high surface quality injection molding: Measurement, influencing factors, prediction, and control

Gim, Jinsu; Turng, Lih‐Sheng

doi:10.1016/j.polymertesting.2022.107718

Cited by 32 publications

(9 citation statements)

References 128 publications

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“…The ratio of the equivalent amount of isocyanate used relative to the theoretical equivalent amount times 100 is known as the isocyanate index (Kairytė et al 2018). The value of this index affects the properties of the measured material, such as foaming, viscosity, gelation and curing times, and the growth rate of the foam (Gim and Turng 2022). Furthermore, the isocyanate index value is related to the number of hard segments in the PU and therefore also affects mechanical properties such as compressive and tensile strength (Kim et One PU foam production method is molding: molding processes are divided into cold and hot according to molding temperature (Dutta 2018;Heath 2017).…”

Section: Introductionmentioning

confidence: 99%

The effect of molding conditions on product properties in the production of flexible polyurethane foam using a Box–Behnken design

Akbal,

SARA,

Şimşek

2024

Preprint

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Polyurethane (PU) foams have become an increasingly important research field due to their use in many areas, such as advanced polymer applications. Many factors affect PU quality during production, and the interaction of these factors with each other also directly affects product quality. For this reason, the study examined the factor effects on PU quality with a systematic design of the experiment and optimization approach. The isocyanate index had the greatest effect on selected quality criteria, such as indentation force deflection, hysteresis loss, wet and dry constant deflection compression, compression force deflection, flammability, and density, synergistically. The strongest interaction effect was from molding temperature and time, which reduced the PU density. Furthermore, optimal process conditions were specified by the desirability function approach as 96.41 (I/P) for isocyanate index, 43.31°C for molding temperature, and 2.15 min. for molding time. Cost-effective PU production with low density by the desired standard is possible.

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Section: Introductionmentioning

confidence: 99%

The effect of molding conditions on product properties in the production of flexible polyurethane foam using a Box–Behnken design

Akbal,

SARA,

Şimşek

2024

Preprint

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“…A Conformal Cooling Channel (CCC), which is created along the surface of the product has been proposed as a solution to increase cooling efficiency for curved products, as well as the resulting quality of injection-molded parts [ 4 ]. Since CCC is not limited by its shape, it is difficult to manufacture using the traditional machining method.…”

Section: Introductionmentioning

confidence: 99%

A Novel Design Method of an Evolutionary Mold Cooling Channel Using Biomimetic Engineering

2023

Self Cite

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In this study, an evolutionary cooling channel, a new methodology for designing a conformal cooling channel, was proposed. This methodology was devised by imitating the way that a plant’s roots grow towards a nutrient-rich location. Additionally, Murray’s law was applied to increase the cooling efficiency through minimizing the pressure loss of the cooling water inside the cooling channel. The proposed method was applied to the specimen shape to verify the concept, and it was confirmed that efficient cooling was achieved by applying it to the headlamp lens cover part of an actual vehicle. When this methodology was applied, the temperature deviation of the part could be improved by about 46% in just third generations, and the pressure loss could be reduced by about 10 times or more compared to the result of applying the straight-line cooling channel.

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“…The need for injection molding is growing with the increasing demand in various industries, such as automotive, medical, and electronic equipment 1,2 . Fiber‐reinforced composites are expected to replace wooden products such as chairs, tables, and furniture elements.…”

Section: Introductionmentioning

confidence: 99%

“…The need for injection molding is growing with the increasing demand in various industries, such as automotive, medical, and electronic equipment. 1,2 Fiber-reinforced composites are expected to replace wooden products such as chairs, tables, and furniture elements. For instance, Sathishkumar et al 3,4 evaluated a chair made of snake grass fiber-reinforced polymer and Sal wood regarding cost, weight, strength, and water absorption.…”

mentioning

confidence: 99%

Simulation‐based analysis of weld line strength of glass fiber‐reinforced polymer in injection molding

Kameya,

Ogata,

Tanohata

2023

Polymer Engineering & Sci

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The injection molding market is expected to grow with the increasing demand from various industries, such as automotive and furniture. However, weld lines in the injection molded part reduce the structural strength and affects its appearance. This study evaluates the effect of the weld line on the structure by shifting the position of the weld line outside the area where the load is applied by manipulating the opening time of the injection gates. We examined the effect of weld lines on the strength of a chair through coupled resin flow and structural analyses. The analysis revealed that the position of the weld lines is crucial for structural strength if the knockdown factor (KDF) is low. Additionally, controlling the opening time of the gate and shifting the position of the weld line improved the structure's appearance, number of weld line and avoid the lower meeting angle. However, depending on the material, the effect may be weak. For example, when the weld line location did not change much despite changing the gate timing, little change was observed in the number of weld lines. Hence, the improvement strategy of weld line should be considered for material types and strength.Highlights Injection molding growth driven by automotive, packaging, furniture demand. Weld lines impact structural strength and appearance. Shifting weld line position outside load area improves the structural appearance and strength. Effects of shifting weld line position depended on the material types. Weld line position is crucial for low knockdown factor and affects strength.

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A review of current advancements in high surface quality injection molding: Measurement, influencing factors, prediction, and control

Cited by 32 publications

References 128 publications

The effect of molding conditions on product properties in the production of flexible polyurethane foam using a Box–Behnken design

The effect of molding conditions on product properties in the production of flexible polyurethane foam using a Box–Behnken design

A Novel Design Method of an Evolutionary Mold Cooling Channel Using Biomimetic Engineering

Simulation‐based analysis of weld line strength of glass fiber‐reinforced polymer in injection molding

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