Study on the Influence of Processing Condition on Impact Property of Injection-Molded Polycarbonate

2012 ◽  
Vol 151 ◽  
pp. 135-138
Author(s):  
Ying Hui Shang ◽  
Bo Wang ◽  
Fang Fang Wang ◽  
Zhi Xin Wang ◽  
Chun Tai Liu
Keyword(s):  
Thermal Treatment ◽  
Impact Strength ◽  
Injection Molding ◽  
Processing Condition ◽  
Impact Property ◽  
Impact Tests ◽  
Injection Molded ◽  
Plastic Components ◽  
Injection Molded Plastic ◽  
The Impact

The impact property of injection-molded plastic components is an important factor to judge their quality. The aim of this paper is to study the effects of processing conition on impact property of injection-molded polycarbonate (PC). By changing the processing conitions such as injection molding parameters and thermal treatment, different impact samples were acquired. Then, Izod and Charpy notch impact tests were carried out to research the relation between the impact strength and the prcessing conditions. The results imply that different processing conitions will lead to different changes of impact property.

scholarly journals Post-Processing Time Dependence of Shrinkage and Mechanical Properties of Injection-Molded Polypropylene

Materials ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 22
Author(s):  
Artur Kościuszko ◽  
Dawid Marciniak ◽  
Dariusz Sykutera
Keyword(s):  
Mechanical Properties ◽  
Impact Strength ◽  
Injection Molding ◽  
Accelerated Aging ◽  
Mold Temperature ◽  
Degree Of Crystallinity ◽  
Injection Mold ◽  
Secondary Crystallization ◽  
Scanning Calorimetry ◽  
Injection Molded

Dimensions of the injection-molded semi-crystalline materials (polymeric products) decrease with the time that elapses from their formation. The post-molding shrinkage is an effect of secondary crystallization; the increase in the degree of polymer crystallinity leads to an increase in stiffness and decrease in impact strength of the polymer material. The aim of this study was to assess the changes in the values of post-molding shrinkage of polypropylene produced by injection molding at two different temperatures of the mold (20 °C and 80 °C), and conditioned for 504 h at 23 °C. Subsequently, the samples were annealed for 24 h at 140 °C in order to conduct their accelerated aging. The results of shrinkage tests were related to the changes of mechanical properties that accompany the secondary crystallization. The degree of crystallinity of the conditioned samples was determined by means of density measurements and differential scanning calorimetry. It was found that the changes in the length of the moldings that took place after removal from the injection mold were accompanied by an increase of 20% in the modulus of elasticity, regardless of the conditions under which the samples were made. The differences in the shrinkage and mechanical properties of the samples resulting from mold temperature, as determined by tensile test, were removed by annealing. However, the samples made at two different injection mold temperature values still significantly differed in impact strength, the values of which were clearly higher for the annealed samples compared to the results determined for the samples immediately after the injection molding.

Impact Strength of High Density Solid-State Microcellular Polycarbonate Foams

2000 ◽  
Vol 123 (2) ◽  
pp. 229-233 ◽  
Author(s):  
Chris Barlow ◽  
Vipin Kumar ◽  
Brian Flinn ◽  
Rajendra K. Bordia ◽  
John Weller
Keyword(s):  
Solid State ◽  
Impact Strength ◽  
Cell Size ◽  
High Density ◽  
Gas Content ◽  
Impact Behavior ◽  
Strong Function ◽  
Impact Tests ◽  
Izod Impact ◽  
The Impact

The effect of density (relative densities 0.33 to 0.90) on the impact behavior of microcellular polycarbonate (PC) was investigated. Cell size and foaming gas content were also considered. Flexed-beam Izod impact tests were conducted and the impact strength of these foams appears to be a strong function of both density and cell size. The impact strength was observed to improve over the unprocessed polycarbonate’s impact strength for foams with relative densities of 60 percent and above. In terms of cell size, the impact strength increased with increasing cell size at a given density.

Effect of thermal treatment on the impact strength of polycarbonate

1986 ◽  
Vol 60 (8) ◽  
pp. 2678-2682 ◽  
Author(s):  
Lee E. Hornberger ◽  
Gloria Fan ◽  
K. L. DeVries
Keyword(s):  
Thermal Treatment ◽  
Impact Strength ◽  
The Impact

Performance of Injection-Molded Plastic Helical Gears Finished by Hot Rolling

2011 ◽  
Author(s):  
Morimasa Nakamura ◽  
Atsushi Katayama ◽  
Ichiro Moriwaki
Keyword(s):  
Injection Molding ◽  
Hot Rolling ◽  
Load Capacity ◽  
Transmission Error ◽  
Tooth Profile ◽  
Test Rig ◽  
Helical Gears ◽  
Injection Molded ◽  
Injection Molded Plastic ◽  
Plastic Gears

A hot-roll finishing was proposed as a simple finishing method for plastic gears. In the hot-roll finishing, plastic work gears are finished by meshing with a heated copper die wheel. In the previous study, a hot-roll finishing rig for plastic gears was developed, and it was confirmed that tooth profiles of hobbed plastic gears are improved by the finishing. Thus, the hot-roll finishing could also be effective for injection-molded plastic gears. In the present paper, appropriate hot-roll finishing procedures for injection-molded polyoxymethylene (POM) helical gears were pursued. In the injection molding, an inadequate mold easily allows large slope deviations on a tooth profile and trace. The hot-roll finishing can reduce the slope deviations, but induces form deviations especially on the profile. Tests of injection-molded and hot-roll-finished plastic gears were performed on a self-produced gear roller test rig and a self-produced fatigue rig, and a transmission error and load capacity were estimated. Compared with injection-molded gears, hot-roll-finished plastic gears showed small transmission error, while a load capacity was at the almost same level. As a result, the hot-roll finishing is effective for improving a transmission error of injection-molded plastic gears.

scholarly journals Selected Issues Concerning Degradation of Material in the Production of Injection Molded Plastic Components

2016 ◽  
Vol 10 (3) ◽  
pp. 173-180
Author(s):  
Marek Jałbrzykowski
Keyword(s):  
Thermal Characteristics ◽  
Test Results ◽  
Base Materials ◽  
Plastic Materials ◽  
Technological Quality ◽  
Injection Molded ◽  
Plastic Components ◽  
Injection Molded Plastic ◽  
Selection Of

Abstract This paper presents the problem of thermal degradation of thermoplastic materials processed using the injection method. Attention was paid to the issue of the optimal selection of a dye for modifying the base materials. For the selected materials and dyes, derivatograph tests were performed in order to assess their thermal characteristics and breakdown kinetics. Additionally, tribological tests and microscope observations of selected samples were performed. The obtained test results suggest a diverse level of thermal processes in the analyzed materials. This is crucial for the appropriate selection of dyes for plastic materials. As it turned out, the tribological properties of materials can also influence the technological quality of the injected alloy.

Study on the effect of processing conditions on the impact strength of PP/SEBS/PC ternary blends using Taguchi experimental analysis

2011 ◽  
Vol 31 (2-3) ◽  
Author(s):  
Omid Moini Jazani ◽  
Ahmad Arefazar ◽  
Seyyed Hassan Jafari ◽  
Mohammad Reza Saeb
Keyword(s):  
Impact Strength ◽  
Processing Condition ◽  
Point Of View ◽  
Interactive Effects ◽  
Processing Conditions ◽  
Ternary Blends ◽  
Screw Speed ◽  
Die Temperature ◽  
Blending Sequence ◽  
The Impact

Abstract In this study, nine ternary blends of polypropylene (PP)/poly [styrene-b-(ethylene-co butylene)-b-styrene] tri-block copolymer (SEBS)/polycarbonate (PC) were produced at different processing conditions through twin screw extruder. Accordingly, die temperature, screw speed, and blending sequences were altered based on L9 Taguchi experimental design as indications of processing variables. Consequently, the impact strength of each produced sample is considered as the responding variable. Analyzing two important aspects, namely main and interactive effects by using Taguchi analysis, was the especial point of view in our contribution; as a result, not only was the PP/SEBS/PC ternary system studied for the first time, but the SEBS-g-MAH compatibilizer also showed sufficient effects on morphology development. It was observed that the impact strength of PP/SEBS/PC ternary blends is not affected by die temperature significantly, whereas screw speed and blending sequence have had effective impacts. Besides, the optimum processing condition, which is proportional to the highest value of impact strength, is recommended through the mentioned ternary blends. These results are also confirmed while applying image analysis on morphology micrographs.

A method to improve dimensional accuracy and mechanical properties of injection molded polypropylene parts

2017 ◽  
Vol 37 (4) ◽  
pp. 323-334 ◽  
Author(s):  
Shuai Li ◽  
Guoqun Zhao ◽  
Jiachang Wang
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Flexural Strength ◽  
Injection Molding ◽  
Weld Line ◽  
Dimensional Accuracy ◽  
Holding Time ◽  
Dimensional Shrinkage ◽  
Injection Molded ◽  
The Impact

Abstract Gas counter pressure (GCP) technology can impose a reverse pressure to melt and thereby effectively increase the pressure acting on the melt at flow front. Theoretically, it has a potential to solve some defects often occurring in conventional injection molding (CIM) process. This paper designed and manufactured a GCP injection mold. GCP injection molding experiments were conducted. Effects of GCP process on melt flow and density, dimensional accuracy, and mechanical properties of molded samples were investigated. The results showed that GCP process can effectively inhibit the “fountain effect” in melt filling process, decrease the dimensional shrinkage of molded samples, increase dimensional accuracy of samples, and effectively improve impact property of samples. For the samples without weld line, tensile strength and flexural strength of GCP injection molded samples are slightly increased in comparison with those of CIM samples, but for the samples with weld line, GCP process can greatly improve the tensile strength and flexural strength of molded samples. When GCP is 9 MPa and GCP holding time is 10 s, the dimensional accuracy of molded samples without weld line, the tensile strength and flexural strength of the molded samples with weld line all increase up to maximum values. In comparison with CIM samples, the dimensional shrinkage of samples without weld line decreases by 17.2%, the tensile strength and flexural strength of samples with weld line increase by 30.51% and 23.69%, respectively. The impact value of the samples molded by process parameter combination of GCP 9 MPa and GCP holding time 20 s is the highest, and the impact value increases by 18.65%.

scholarly journals ОСОБЛИВОСТІ ПЕРЕРОБКИ НАПОВНЕНИХ ПОЛІАМІДНИХ КОМПОЗИЦІЙ МЕТОДОМ ЛИТТЯ ПІД ТИСКОМ

2020 ◽  
Vol 140 (6) ◽  
pp. 71-80
Author(s):  
С. В. Пристинський ◽  
Ю. О. Будаш ◽  
В. І. Ступа ◽  
І. О. Пустовойт
Keyword(s):  
Comparative Analysis ◽  
Impact Strength ◽  
Injection Molding ◽  
Process Parameters ◽  
Polymer Composition ◽  
Injection Molding Process ◽  
Composition Material ◽  
Technological Parameters ◽  
Polyamide 6.6 ◽  
The Impact

Comparative analysis the main parameters of injection molding and the physic-mechanicals properties of polymer compositions based on polyamide 6.6. Samples we had obtained by injection molding method at injection molding machine ENGEL E-MAC 170/75. The process parameters had determined empirically to achieve certain quality criteria. Physics and mechanicals properties had evaluated by Sharpy impact strength. Statistical data processing, construction of graphs and diagrams had done in MS Excel. During the researching, had done a comparative analysis of the main parameters of the injection molding process, physical and mechanical properties, such as impact strength of the samples obtained from the glass-filled polymer composition based on polyamide PA6.6-GFGB30 and the material without glass filler PA6.6. During the experiment and data, analysis had revealed an increase in the impact strength of samples by 43%, cast from polymeric composition material PA6.6-GFGB30 in comparison with PA6.6. At the same time the process parameters such as the temperature, which directly affects the energy resources consumption, did not receive statistically significant changes. Among the features of changes in process parameters, we can note an increase in switching pressure, a decrease in the dosing time, and others. In addition, the speed and linear values of the process have changed. For the first time had performed a detailed comparative analysis the main processing parameters by injection molding and the physic-mechanicals properties of polymer compositions based on polyamide 6.6. The results will allow a professional approach to the selection of polymer compositions and technological parameters the process of their processing by injection molding.

Rice Husk/High Density Polyethylene Bio-Composite: Effect of Rice Husk Filler Size and Composition on Injection Molding Processability with Respect to Impact Property

2009 ◽  
Vol 83-86 ◽  
pp. 367-374 ◽  
Author(s):  
Wan Aizan Wan Abd. Rahman ◽  
N.M. Isa ◽  
A.R. Rahmat ◽  
N. Adenan ◽  
R.R. Ali
Keyword(s):  
Impact Strength ◽  
Injection Molding ◽  
Rice Husk ◽  
High Density Polyethylene ◽  
Injection Molding Process ◽  
Melt Flow ◽  
Molding Process ◽  
Melt Flow Rate ◽  
Filler Size ◽  
The Impact

The compounding of rice husk and high density polyethylene (HDPE) was undertaken on a Sino PSM 30 co-rotating twin screw extruder. Four sizes of rice husk were studied at various compositions. The size ranged from 500 μm and below (coded A, B, C and D) while the content of rice husk in the composite varies from 30, 40 and 50 percent of weight. A fixed amount of Ultra-Plast TP10 as a compatibilizer and Ultra-Plast TP 01 as lubricant, were added into the bio-composite compound. The injection molding process ability of the bio-composite was studied through flow behavior on melt flow indexer and analyzed on JSW N100 B11 Injection Molding. Size A which has the largest particle is the most appropriate size as the bio-composite filler based on thermal stability test. The melt flow rate of rice husk/HDPE (RHPE) decreases with the increased in rice husk compositions and apparent viscosity also increases with composition for all filler size. Melt flow rate above 4g/10 min was found to be the lower limit for injection molding process. The smaller the filler size, the lower is the impact strength and the increased in the filler composition lowers the impact strength. A bio-composite at 30 weight percent rice husk size A (RH30PEA) was found to have optimum rheological properties with respect to impact strength.

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