Study of Flow Font Advancement during Filling Stage of a Spiral Mold

2013 ◽  
Vol 371 ◽  
pp. 534-538 ◽  
Author(s):  
Ionut Laurentiu Sandu ◽  
Felicia Stan ◽  
Catalin Fetecau
Keyword(s):  
Numerical Simulations ◽  
Process Parameters ◽  
High Density Polyethylene ◽  
Injection Pressure ◽  
Mold Temperature ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Flow Front ◽  
Melt Temperature

The objective of this paper consists in the determination of the flow front length using o circular spiral mold. The paper also studies the influence of the process parameters on the flow front length using the method of statistical analysis. For this purpose, a number of numerical simulations are carried out by utilizing the combination of four process parameters (i.e., the melt temperature, the spiral thickness, the injection pressure and the mold temperature) at three levels. In order to reduce the number of numerical simulations, a simplistic Taguchi L27orthogonal array was chosen. The material chosen for this study was a low density polyethylene and a high density polyethylene. The flow front length was measured through a marked pattern of the circular spiral using the AutoCAD.

scholarly journals Optimization of Process Parameters for Vertical-Faced Polypropylene Bottle Injection Molding

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Youmin Wang ◽  
Zhichao Yan ◽  
Xuejun Shan
Keyword(s):  
Injection Molding ◽  
Process Parameters ◽  
Dwell Time ◽  
Optimization Problem ◽  
Injection Pressure ◽  
Mold Temperature ◽  
Orthogonal Test ◽  
Injection Molding Process ◽  
Injection Time ◽  
Melt Temperature

In order to obtain the optimal combination of process parameters for vertical-faced polypropylene bottle injection molding, with UG, the model of the bottle was drawn, and then, one module and sixteen-cavity injection molding system was established and analyzed using Moldflow. For filling and maintaining pressure during the process of infusion bottle injection molding, the orthogonal test table L25 (56) using CAE was designed for injection molding of the bottle, with six parameters such as melt temperature, mold temperature, injection pressure, injection time, dwell pressure, and dwell time as orthogonal test factors. By finding the best combination of process parameters, the orthogonal experiment was completed, the results were analyzed by range analysis, and the order of influence of each process parameter on each direction of optimization was obtained. The prediction dates of the infusion bottle were gained under various parameters, a comprehensive quality evaluation index of the bottle was formulated, and the multiobjective optimization problem of injection molding process was transformed into a single-objective optimization problem by the integrated weighted score method. The bottle parameters were optimized by analyzing the range date of the weighted scoring method, and the best parameter combination such as melt temperature 200°C, mold temperature 80°C, injection pressure 40 MPa, injection time 2.1 S, dwell pressure 40 MPa, and dwell time 40 S was gained.

Influence of Injection Molding Parameters on Mechanical Properties of Low Density Polyethylene Filled With Multiwalled Carbon Nanotubes

2011 ◽  
Author(s):  
Catalin Fetecau ◽  
Felicia Stan ◽  
Daniel Dobrea ◽  
Dan Catalin Birsan
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Injection Molding ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Flow Direction ◽  
Mold Temperature ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Melt Temperature

In this paper, we investigated the effect of injection molding parameters such as melt temperature, mold temperature, injection speed and holding pressure on the mechanical properties of low density polyethylene reinforced with 2.5 wt% multi-walled carbon nanotubes. The Taguchi methodology with four factors and two levels was used for the design of the injection molding experiments. The mechanical properties were evaluated by tensile tests in the flow direction at room temperature (23 °C) at crosshead speeds of 1 and 5 mm/min. It was found that the mechanical properties can be modified by manipulating the injection molding parameters. The Young’s modulus of the LDPE-MWNTs composite decreased as the melt temperature increased, while mold temperature, injection molding speed and holding pressure have a moderate influence on the Young’s modulus.

Effect of Process Parameters on Mechanical Properties of Carbon Fiber Reinforced ABS Composites

2019 ◽  
Vol 815 ◽  
pp. 145-150
Author(s):  
Yu Xin Dong ◽  
Quan Wang ◽  
Chong Ying Yang ◽  
Wen Zhe Xu ◽  
Shuo Zhou ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Fiber ◽  
Tensile Stress ◽  
Process Parameters ◽  
Injection Pressure ◽  
Mold Temperature ◽  
Carbon Fiber Composites ◽  
Melt Temperature ◽  
Twin Screw ◽  
Power Content

In this paper, the carbon fiber and ABS composites were prepared in different carbon fiber power mass percent by the twin screw extruder. The mechanical properties of the ABS/CF composites were studied in different process parameters by injection molding. The influence of mold temperature, melt temperature, packing pressure and injection pressure on the mechanical properties was analyzed in different carbon fiber composites. The results show that with the content of carbon fiber increase, the tensile stress of the composite materials also increase. The effect of different carbon fiber power content on tensile stress is greater compared with process parameters.

Modeling and Analysis of Process Parameters for Plastic Injection Molding of Base-Cover

2012 ◽  
Vol 602-604 ◽  
pp. 1930-1933 ◽  
Author(s):  
Yan Fang Yin
Keyword(s):  
Process Parameters ◽  
Injection Pressure ◽  
Acrylonitrile Butadiene Styrene ◽  
Analysis Data ◽  
Mold Temperature ◽  
Melt Temperature ◽  
Modeling And Analysis ◽  
Filling Time ◽  
And Performance ◽  
The Cost

The quality of the plastic part depends on the material characteristics, the mold design, and the process parameters, one of which is more important. It involves many sub-design tasks that determine the cost and performance in the early conceptual mold layout design phase. Base-Cover was injection molded with acrylonitrile–butadiene–styrene (ABS)/polycarbonate (PC) [ABS/PC] alloy resin and its process parameters was analyzed by commercial Moldflow software. The optimum gate location and melt filling time were determined, and the optimum injection temperature was obtained by analyzing the shrinkage of the product after molding. An effective regression model was developed to determine the mathematical relationship between the process parameters (mold temperature, melt temperature, injection pressure, injection time, and cooling time) and the volumetric shrinkage by utilizing the analysis data.

scholarly journals POTENSI BAKTERI Pseudomonas sp. DAN Ochrobactrum sp. YANG DI ISOLASI DARI BERBAGAI SAMPEL TANAH DALAM MENDEGRADASI LIMBAH POLIMER PLASTIK BERBAHAN DASAR HIGH DENSITY POLYETHYLENE (HDPE) DAN LOW DENSITY POLYETHYLENE (LDPE)

2017 ◽  
Vol 5 (2) ◽  
pp. 58 ◽  
Author(s):  
Muhammad Inas Riandi ◽  
Retno Kawuri ◽  
Sang Ketut Sudirga
Keyword(s):  
High Density Polyethylene ◽  
Large Scale ◽  
Bacterial Species ◽  
High Density ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Determinative Bacteriology ◽  
Vitek 2 ◽  
Degradation Ability

plastics on a large scale has an effect on the increase to the amount of world waste, such as High Density Polyethylene (HDPE)and Low Density Polyethylene (LDPE) plastics. This study, tried to isolate Pseudomonas and Ochrobactrum bacteria from varioussoil in dumped soil area and mangrove forest in Bali to find out the degradation ability of the bacteria against HDPE and LDPEplastics. The methods used in this study were pour plate method, Biochemical and morphology identification by using Bergey’sManual of Determinative Bacteriology 9th Edition book as a reference, screening test and the determination of bacterial species byusing Vitek 2 Compact System. Evaluation of degradation result was done by measuring the weight loss of plastics residues. Thisstudy has isolated 27 bacteria that estimated from genus Pseudomonas and Ochrobactrum with characteristics as basil shape, Gramnegative, positive catalase and classified as non-fermenter bacteria. Isolate 2 bacteria which isolated from Suwung dumped soil hasidentified as Ochrobactrum anthropi with the ability of HDPE degradation by 20% and Isolate 24 which isolated from Karangasemdumped soil has identified as Pseudomonas aeruginosa with the ability of HDPE degradation by 18,75%.Keywords : Plastics waste, Biodegradation, High Density Polyethylene and Low Density Polyetene

OPTIMIZATION OF INJECTION PROCESS PARAMETERS OF PLASTIC REINFORCED COMPOSITES USING RESPONSE SURFACE METHODOLOGY AND CENTRAL COMPOSITE DESIGN

2021 ◽  
Author(s):  
ADEFEMI O. ADEODU ◽  
MUKONDELELI G. KANAKANA-KATUMBA ◽  
RENDANI W. MALADZHI ◽  
ILESANMI A. DANIYAN
Keyword(s):  
Tensile Strength ◽  
Process Parameters ◽  
Injection Pressure ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Reinforced Composites ◽  
Microstructural Properties ◽  
Cavity Pressure ◽  
Injection Parameters ◽  
Central Composite

The injection molding process is among the most efficient processes for mass production of polymer products with complex geometry at optimal cost. This study investigates the effect of the injection parameters on the cavity pressure, tensile and microstructural properties of plastic-reinforced composites and optimized the process to determine the optimum injection parameters using the Response Surface Methodology and central composite design. The two polymer composite materials used for this work are low-density polyethylene reinforced with aluminium powder (LDPE/Al) and low-density polyethylene reinforced with carbon black (LDPE/CB) at 250 and 200oC injection temperature respectively. The analysis of the results obtained from both the numerical and physical experimentations were used to obtain two predictive models which correlate cavity pressure and tensile strength as a function of the independent process parameters namely, injection pressure and time. An injection pressure of 70 MPa and time of 1.00 sec was found to be optimum producing a cavity pressure of 37.658 MPa while an injection pressure of 70 MPa and time of 1.75 sec was found to be optimum producing a material with tensile strength of 7.41 MPa. The results indicate that the cavity pressure increases with an increase in the injection pressure but decreases with an increase in the injection time for the two analyzed polymer composites. The study shows that process parameters have significant effects on the cavity pressure, mechanical and microstructural properties of LDPE/Al and LDPE/CB.

scholarly journals Utilization of Terahertz Spectroscopy for Optical Behavior Determination of Recycled Modified HDPE

2014 ◽  
Vol 1025-1026 ◽  
pp. 547-550
Author(s):  
Jan Navratil ◽  
Miroslav Manas ◽  
Michal Stanek ◽  
David Manas ◽  
Martin Bednarik ◽  
...  
Keyword(s):  
Particle Size ◽  
Refractive Index ◽  
High Density Polyethylene ◽  
Terahertz Spectroscopy ◽  
Measured Data ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Wide Range ◽  
Optical Behavior

Little research was done to investigate possible utilization of irradiated materials after the end of their lifetime. This research paper deals with the possible utilization of irradiated high-density polyethylene (HDPEx) after its service life. Irradiated HDPE was used as filler into the virgin low-density polyethylene (LDPE). Three material combinations were investigated (powder/powder, granules/powder and granules/grit) and influence of the filler on optical behavior was measured. Terahertz spectroscopy at wide range of frequencies was used for refractive index determination. According to measured data there is significant influence by the amount of the filler. Moreover influence of particle size was also observed. All three combinations have similar curve courses; however the most consistent results were achieved at the powder/powder combination. Behavior of virgin LDPE and virgin HDPE is in correlation with previous findings.

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