Filling-Balance-Oriented Parameters for Multi-Cavity Molds in Polyvinyl Chloride Injection Molding

Tsai, Hsi-Hsun; Wu, Shi Liang; Liu, Jiawei; Chen, Sin-He; Lin, Jui-Jung

doi:10.3390/polym14173483

Cited by 9 publications

(4 citation statements)

References 26 publications

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“…The identification of parameters affecting the formation of warpage of PVC moldings was also addressed by Ahmed et al A mathematical model was developed to regulate warpage before production and minimize losses [80]. Subsequently, Tsai et al, using Moldex3D and the Taguchi method, determined the possibility of eliminating imbalanced filling of multicavity molds for PVC injection molding [81].…”

Section: Polyvinyl Chloridementioning

confidence: 99%

Advanced Injection Molding Methods: Review

Czepiel,

Bańkosz,

Sobczak-Kupiec

2023

Materials

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Injection molding is a method commonly used to manufacture plastic products. This technology makes it possible to obtain products of specially designed shape and size. In addition, the developed mold allows for repeated and repeatable production of selected plastic parts. Over the years, this technology grew in importance, and nowadays, products produced by injection molding are used in almost every field of industry. This paper is a review and provides information on recent research reports in the field of modern injection molding techniques. Selected plastics most commonly processed by this technique are discussed. Next, the chosen types of this technique are presented, along with a discussion of the parameters that affect performance and process flow. Depending on the proposed method, the influence of various factors on the quality and yield of the obtained products was analyzed. Nowadays, the link between these two properties is extremely important. The work presented in the article refers to research aimed at modifying injection molding methods enabling high product quality with high productivity at the same time. An important role is also played by lowering production costs and reducing the negative impact on the environment. The review discusses modern injection molding technologies, the development of which is constantly progressing. Finally, the impact of the technology on the ecological environment is discussed and the perspectives of the process were presented.

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Section: Polyvinyl Chloridementioning

confidence: 99%

Advanced Injection Molding Methods: Review

Czepiel,

Bańkosz,

Sobczak-Kupiec

2023

Materials

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“…where p and τ rz are the pressure and the shear stress, respectively. To get the flow velocity of the fluid v z (r) in a cylindrical channel, the calculation procedures starting from Equations ( 2)-( 4) can be found in references [7,14], and will not be reiterated here for compendiousness. Finally, the v z (r) can be expressed by:…”

Section: Rheological Behavior Of Molten Plasticmentioning

confidence: 99%

“…A suitable objective function needs to be defined in advance; otherwise, the result will be unacceptable. The design of the experiment also provides an optimal arrangement solution to a balanced flow type [12][13][14]. For the past decades, most of the runner system designs of an injection mold were implemented by the empirical rule or trial and error approach.…”

Section: Introductionmentioning

confidence: 99%

A Semi-Analytical Method for Designing a Runner System of a Multi-Cavity Mold for Injection Molding

Lin

Chen

et al. 2022

Polymers

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Multi-cavity mold design is an efficient approach to achieving mass production and is frequently used in plastic injection applications. The runner system of a multi-cavity mold delivers molten plastic to each cavity evenly and makes the molded product from each individual cavity possess an equivalent quality. Not only the dimensions, but also the invisible quality, e.g., the internal stress of the product is of great concern in regard to molding quality. Using commercial software to find an optimal solution for the runner system may be time-consuming in respect to iterations if the engineers lack empirical rules. The H-type runner system is often used due to an inherently balanced filling in multi-cavities. However, the shear heat inducing an imbalanced flow behavior requires the H-type runner system to be improved as the number of the cavities is increased. This work develops a methodology based on the rheological concept to determine the runner system of a multi-cavity mold semi-analytically. As the relation of the viscosity with respect to shear rate is known, the runner system can be constructed step-by-step via this method. The use of the proposed method helps to focus attention on the connection between the physical situation and its related mathematical model. The influences of the melt temperature and resin type can be easily investigated. Three design examples, a 16-cavity mold with a fishbone runner system, an 8-cavity mold with an arbitrary runner layout, and the influences of melt temperature and resin type on the runner design are demonstrated and validated by the commercial software. The proposed method shows its great benefit when a new runner design project is launched in the initial design stage and then cooperates with the commercial software for further modifications.

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“…Mahajan and Ulhe [11] reported mould closing speed as the most dominant parameter for obtaining optimal weight using the Taguchi technique of CPVC elbow parts manufactured using injection moulding. Tsai et al [12] used Moldex3D and the Taguchi method for optimising the mould filling rate for injection moulding of PVC and reported that the temperature of the part increased due to the injection rate. Ardestan et al [13] tried to optimise the blush defect in PVC bushings made using injection moulding by using ANN, PSO, and GA.…”

Section: Introductionmentioning

confidence: 99%

Weight Optimization of Plastic Injection Moulded Electrical Wire Casing Thermoplastic using Hybrid RSM-Tunicate Swarm Algorithm

Barua,

Jeet,

Mishra

et al. 2023

E3S Web Conf.

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The need for fire-retardant material for electrical wire covers and cases is increasing as the global population continues to expand at an alarming rate. In addition to having good fire and chemical resistance, CPVC (chlorinated polyvinyl chloride) is widely accessible in a assortment of forms and sizes, comprising rods, sheets, and tubes. Plastic injection moulding (PIM) provides a method that allows for the production of CPVC items at a rapid pace and at a low cost. When these mouldings are lightweight, they may reduce the amount of non-biodegradable materials that are used in their construction. The present research gives an insight into the CPVC material moulding for electrical wire casing elbows using an injection moulding machine, which was previously unexplored. Four plastic injection moulding parameters were considered in order to reduce the weight of the elbow, including injection pressure, mould closing speed, mould pressure, and backpressure. The 27 tests were piloted in line with Response Surface Methodbased Box-Behnken Design, and the factors were optimised using Tunicate Swarm Algorithm, which was recently developed. In the case of the plastic injection-moulded item, the analysis of variance revealed that the most significant parameter in the weight reduction was the material used. It has been determined that mould pressure is the most critical factor impacting the weight of the item when it is manufactured. As a result, the optimum manufacture of injection-moulded CPVC components will be facilitated, resulting in optimised weight while also minimising production time and raw material waste for electrical wire casing.

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Filling-Balance-Oriented Parameters for Multi-Cavity Molds in Polyvinyl Chloride Injection Molding

Cited by 9 publications

References 26 publications

Advanced Injection Molding Methods: Review

Advanced Injection Molding Methods: Review

A Semi-Analytical Method for Designing a Runner System of a Multi-Cavity Mold for Injection Molding

Weight Optimization of Plastic Injection Moulded Electrical Wire Casing Thermoplastic using Hybrid RSM-Tunicate Swarm Algorithm

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