Flow front advancement of molten thermoplastic materials during filling stage of a mold cavity

Özdemir, Ahmet; Uluer, Onuralp; Güldaş, Abdulmecit

doi:10.1016/j.polymertesting.2004.04.011

Cited by 37 publications

(18 citation statements)

References 5 publications

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“…For example, the process parameters are corrected by monitoring the cavity pressure in order to reduce shrinkage and warpage resulting from residual stress inside the plastic parts [1][2][3]. There are many methods of monitoring the physical quantities inside a cavity during the process, including measuring the melt flow front [4][5][6][7][8][9], mold heat flux [10,11], mold temperature [11][12][13][14][15], cavity pressure/ temperature [1,2,[14][15][16][17][18][19][20][21][22][23], and dimensions and properties of the molded part [3,[24][25][26][27]. The sensor types include the frequently used contact type, noncontact type [28][29][30][31], and even a wireless type of sensor [32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Correlation between runner pressure and cavity pressure within injection mold

Tsai

Lan

2015

Int J Adv Manuf Technol

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Cavity pressure in the injection molding process is closely related to the quality of the molded products and is used for process monitoring and control to upgrade the quality of molded products. However, the sensor installed inside the cavity makes the molded product of the cavity defective, reducing productivity. In view of this, this study investigates the correlation between melt pressure and cavity pressure in different runner positions and determines the appropriate runner position, where the runner pressure can represent the cavity pressure, in order to increase productivity. First, the Taguchi method is used to obtain the optimal parameter combination of injection molding, and then, the experiment is conducted based on this condition in order to discuss the difference between runner and cavity pressure history profiles. According to the experimental results, the quality of molded products can be monitored and controlled by installing sensors at different runner positions, and the maximum value of the cavity pressure profile varies with the runner position. When the distance between the top of the pressure sensor mounted in the secondary runner and the outside diameter of the runner is greater than the maximum thickness of the molded product, the obtained pressure history profile approximates to that inside the cavity. In other words, the runner pressure can represent the cavity pressure. Mold temperature significantly influences the runner pressure history profile and form accuracy (contour precision) of the lens during the injection molding process, which can be used as a process monitoring and control parameter. In addition, the cavity pressure profile at the cooling stage is closely related to the form accuracy of the lens and is the key to determining process monitoring and control parameter.

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Section: Introductionmentioning

confidence: 99%

Correlation between runner pressure and cavity pressure within injection mold

Tsai

Lan

2015

Int J Adv Manuf Technol

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“…There is a chance to observe the behavior of the moulded piece in a different set conditions in the early phase of design, which finally allow to reduce the entire cycle of manufacturing moulded parts to a minimum. There are system called CAD/CAM/CAE (Computer Aided Design / Computer Aided Manufacturing / Computer Aided Engineering), that in the molding process became an indispensable part of it [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. The objective of research was to analyze the process of numerical heat transfer between the moulded piece and injection mold cavity in an injection molding process.…”

Section: Introductionmentioning

confidence: 99%

Numeric modelling of the temperature distribution of moulded piece in the simulation of injection molding process

Gnatowski¹,

Golas²,

Gnatowska³

2015

AIP Conference Proceedings

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“…Las aplicaciones parecen ilimitadas para los termoplásticos, pudiendo hacerse desde piezas simples a muy complejas con una grande tolerancia dimensional (Ozdemir et al, 2004). Numerosos artículos de uso cotidiano tienen una pieza moldeada por el proceso de inyección, entonces las empresas vinculadas a este proceso sufren exigencias para constante innovación de los productos mejorando sus técnicas y aumentando la calidad (Bareta et al, 2008;Fuh et al, 2004).…”

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Reducción del Tiempo de Ciclo de Inyección de Termoplásticos con el uso de Moldes con Tratamiento Superficial por Nitruración

2012

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ResumenSe presenta un estudio sobre la transferencia de calor en un molde, comparando los ensayos de inyección utilizando moldes con y sin tratamiento superficial de nitruración. Simulaciones del proceso se realizaron con el uso de Asistencia Computacional a Ingeniería (CAE) para determinar los parámetros iniciales que se aplicaron en los ensayos reales en moldes instrumentados de acero P20 (con y sin tratamientos), inyectados con el polímero poliestireno cristal. Los resultados indicaron una reducción del tiempo de enfriamiento y del tiempo de proceso en el molde con el tratamiento, debido a una mejora en la conductividad térmica. Palabras clave: inyección, molde, tiempo de ciclo, enfriamiento, tratamiento superficial Cycle Time Reduction of Thermoplastic Injection using Nitriding Treatment Surface Molds AbstractA study on the heat transfer in a mold, comparing experimental injection tests using a mold with and without surface treatment (nitriding) is presented. Process simulations were carried out using Computer Aided Engineering tools (CAE) for the estimation of the initial parameters to be applied in the tests in instrumented P20 steel injection molds with the polymer crystal polystyrene. Results indicated a reduction of cooling time and of the time of the process in the mold with treatment, due to an increase of the thermal conductivity.

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Flow front advancement of molten thermoplastic materials during filling stage of a mold cavity

Cited by 37 publications

References 5 publications

Correlation between runner pressure and cavity pressure within injection mold

Correlation between runner pressure and cavity pressure within injection mold

Numeric modelling of the temperature distribution of moulded piece in the simulation of injection molding process

Reducción del Tiempo de Ciclo de Inyección de Termoplásticos con el uso de Moldes con Tratamiento Superficial por Nitruración

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