Sriseubsai, Wipoo

Preferred name

Sriseubsai, Wipoo

Alternative Name

Sriseubsai, W.

Main Affiliation

School of Engineering

wipoo.sr@kmitl.ac.th

Now showing 1 - 10 of 11

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Optimized plastic injection molding pr ocess and minimized the warpage and volume shrinkage by response surface methodology with genetic algorithm and firefly algorithm techniques
(2017-06-01)
Sudsawat, Supattarachai
;
Sriseubsai, Wipoo
This goal of this paper is an optimization approach to generate suitable process setting of multi responses of the minimization of warpage and volume shrinkage in the plastic injection molding (PIM). Central composite design (CCD) was employed to handle the orthogonal array for experimental test runs and using the response surface methodology (RSM) to construct response surface equation model. Then the optimization methods of firefly algorithm (FA) that have never been applied to minimize warpage and volume shrinkage in the plastic injection molding (PIM) and genetic algorithm (GA) were employed to optimal parameter conditions with fitness function generated from RSM. Simulation software Moldex 3D and plastic injection machine were used as the experimental tests to show the comparison of the optimal performance of both metaheuristic algorithms. The results showed that the firefly algorithm created the suitable process parameters to meet the minimization of warpage and volume shrinkage better than the popular genetic algorithm for this study. It can be concluded that FA is very proper to approach the good performance in PIM.
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The simulation of volume shrinkage for double-injection molding with PC and ABS
(2018-08-14)
Leklong, Pichai
;
Sriseubsai, Wipoo
The objective of this paper was to study and analyze the plastic injection molding parameters to reduce the volume shrinkage of double injection molded part. The specimen was molded with Acrylonitrile-butadiene-styrene (ABS) after Polycarbonate was molded as a half part. The weld line occurred at the haft of the molded part. The simulation with Moldex 3D R13 and the design of experiment with Taguchi method was used to perform the experiments and analyze the data to get the optimum of volume shrinkage. The results showed that melt temperature and packing pressure was significant to the volume shrinkage. When using low melt temperature and high packing pressure, the shrinkage was low and related to the thermal expansion of the material. It would be one of the parameters to the design of double injection molding.
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Preparation and characterization of the Na2Ti3O7: ABS/Na2Ti3O7 composites
(2017-01-01)
Sangkatip, Rittichai
;
Sriseubsai, Wipoo
;
Kiatkittipong, Kunlanan
Titanate Ribbon (Na<inf>2</inf>Ti<inf>3</inf>O<inf>7</inf>) used in ABS plastic was synthesized to study the mechanical properties and to conduct test on the E-coli bacteria inhibition performance. The polymer blends of ABS/Na<inf>2</inf>Ti<inf>3</inf>O<inf>7</inf> by Na<inf>2</inf>Ti<inf>3</inf>O<inf>7</inf>, was synthesized through alkaline hydrothermal reaction with 0.5 grams of titanium dioxide as a precursor with 20 ml. of sodium hydroxide (NaOH) at the concentration of 10 molar under the alkalinity at 200°c for 24 hours. The study on the microstructure by scanning electron microscope revealed that the Layered structure was shaped as a complete ribbon. The mechanical testing activities on the E-coli bacteria inhibition polymer mixed ABS/Na<inf>2</inf>Ti<inf>3</inf>O<inf>7</inf>; it was found that the mechanical properties for ABS/Na<inf>2</inf>Ti<inf>3</inf>O<inf>7</inf>, The results showed that tensile modulus and tensile strength of blending Na<inf>2</inf>Ti<inf>3</inf>O<inf>7</inf> at 0.5 %wt was the highest. The result showed that E.coli could reduce up to 66.01%.
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Warpage reduction through optimized process parameters and annealed process of injection-molded plastic parts
(2018-10-01)
Sudsawat, Supattarachai
;
Sriseubsai, Wipoo
The objective of this paper is to achieve the minimization of warpage for an injection molded part. The techniques that were implemented to minimize the warpage are the design of experiment (DOE), response surface methodology (RSM), firefly algorithm (FA), and annealing treatment. The packing time, cooling time, and melt temperature were shown to be significant parameters and FA was employed to seek these suitable values by experimental tests based on simulation software Moldex3D and injection machine. Analysis of variance (ANOVA) was used to validate experiments. Annealing treatment process was then applied to reduce more warpage phenomenon; the results showed that warpage phenomenon decreased dramatically compared with popular optimized parameter methodology. Moreover, the residual stress which was obtained by using photoelasticity showed that it has a direct relationship with warpage reduction. Therefore, the best solution of warpage mitigation can be solved by popular optimum process parameters and also annealing treatment.
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An application of the design of experiment for purging of injection molding machine and hot runner mold
(2013-01-01)
Sriseubsai, Wipoo
This research was proposed on the experimental study on purging of an injection molding machine's barrel and hot runner mold. The Taguchi method was used to design the experiment with two level of shot size, melt temperature, injection speed, screw speed, injection pressure, back pressure and suck back position and two level of temperature at hot runner mold. Those factors were controllable factors while mixing with recycle material and moisture content of material were uncontrollable factors. The ABS resin was used to perform the experiment. It was mixed with 5% (by weight) of mica particles and acted as particle tracer and used for the first shot. Then, the barrel and hot runner mold were purged with virgin ABS. The results showed that shot size, melt temperature, screw speed and injection speed were main factors which significant for purging and the mixing recycle material effect to purging more than the moisture content in material. However the suck back position should be used during purging. The temperature of hot runner mold should be set at normal injection condition.
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Novel foodstuff conveyor belts compound for energy saving: The effect of microwave pre-heating and mixed fillerson mechanical properties
(2017-01-01)
Limhengha, S.
;
Limnararat, S.
;
Jangchud, I.
;
Sriseubsai, W.
This research presents an effect of microwave power being utilized in preheating of a foodstuff conveyor belts compound (FCBc), with or without mixed fillers, and sulfur at different volumes of 1.0, 1.5 and 2.0 phr respectively. Prior to hydraulic molding press at 150 oC, an FCBc is preheated for one minute through an industrial microwave system at a frequency of 2.45 GHz along with microwave power of 340, 850 and 1,700 watts whereas the cure timeis a time 50%. The result shows that the FCBc with mixed fillers and 1.0 phr sulfur with microwave power at 340 watts demonstrates an effective crosslink between the rubber and the fillers which subsequently produces the FCBc that contains better mechanical properties, not only at the lower cost on raw material but also the curing time reduces to 40.20 % per production round.
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Antibacterial and mechanical properties of the TiO2/ABS composites
(2017-01-01)
Sangkatip, Rittichai
;
Sriseubsai, Wipoo
;
Kiatkittipong, Kunlanan
The aim of this present work is to enhance photoantibacterial performance on a surface of Acrylonitrile-Butadiene-Styrene (ABS) by mixing titanium dioxide (TiO<inf>2</inf>). The influences of different ratios for TiO<inf>2</inf> under UV light irradiation were investigated according to JIS Z 2801: 2010 standard. 0.5%, 1% and 2% TiO<inf>2</inf>/ABS were formed by melting process with internal mixer and compression molding process. E.coli were chosen as a model of bacteria. The best photoantibacterial activity was provided by 0.5% TiO<inf>2</inf>/ABS. The result showed that E.coli could reduce up to 46.95%. However, a higher amount of TiO<inf>2</inf> (i.e., 1% and 2% TiO<inf>2</inf>/ABS) obstructed the reaction, and E.coli was reduced to 42.6% and 36.08%, respectively. This was due to its aggregation observed from SEM image. For mechanical properties for TiO<inf>2</inf>/ABS, The results showed that tensile modulus and tensile strength of blending TiO<inf>2</inf> at 0.5 %wt was the highest but the tensile was decreased when increasing TiO<inf>2</inf> in polymer blended.
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The experimental study on purging of injection molding machine
(2011-08-23)
Sriseubsai, Wipoo
This research was to study on purging of injection molding machine. The polypropylene was used in this study. The fractional design was used to design the experiments with five main factors and two levels such as processing temperature, injection pressure, screw speed, injection velocity, and suck-back position. Some interactions were shown with the analysis by Minitab. Those factors were effect in purging. The recommend to purge the PP were using high level of screw speed, injection velocity and suck - back position while the processing temperature and injection pressure should be in the low level.
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Effect of mixed filler on thermal properties of foodstuff conveyor belts compound using an industrial microwave pre-heating
(2016-01-01)
Limhengha, Suphatchakorn
;
Limnararat, Sunpasit
;
Sriseubsai, Wipoo
This study presented the utilization of microwave power for heating of epoxidized natural rubber-50 compounding (ENR50c) with and without mixed filler in which the sulfur contents were 1.0, 1.5 and 2.0 parts per hundred parts of dried rubber by weight basis, respectively. The microwave power used was varied in a range of 340-1,700 W with a constant frequency of 2.45 GHz. The mixed filler significantly affected the relative dielectric constant, relative loss factor and loss tangent coefficient. The microwave power and time strongly influenced the temperature of the specimen. The longer time and higher microwave power resulted in higher temperature of the specimen. On the contrary, the thickness of specimen inversely affected the temperature of the specimen. The lower temperature was obtained from the thicker specimen.
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Optimizing the properties of vulcanized compounds for foodstuff conveyor belts in industrial microwave per-heating
(2018-01-01)
Limhengha, Suphatchakorn
;
Sriseubsai, Wipoo
This research finds a natural rubber-based material with good dielectric properties and low cost for a foodstuff conveyor belt (FCB) that can be heated with microwaves. For this purpose, epoxidized natural rubber-50 (ENR50) and standard Thai rubber 5L (STR5L) were mixed with a filler mixture of silica and magnesium carbonate. The FCB compound with filler (FCBcF) yielding the best vulcanization time, and the best mechanical, dielectric and dynamic properties, was selected for further study. The optimal FCBcF, ENR50:SiO<inf>2</inf>:MgCO<inf>3</inf> (100:40:40) with microwave pre-heating at 2.45 GHz and 340 W for one minute before vulcanization, was well cross-linked and strongly converted the microwaves to heat. FCBcF also showed satisfactory mechanical properties with reduced cost of raw materials and reduced the curing time by 50% per round. The results demonstrate that pre-heating of FCBcF prior to vulcanization reduces the time and cost of fabricating FCBs, providing long-term economic and environmental benefits.

Sriseubsai, Wipoo

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