Electrical Properties of Recycled Plastic Nanocomposites Produced by Injection Molding

2010 ◽  
Author(s):  
R. J. Reddy ◽  
R. Asmatulu ◽  
W. S. Khan
Keyword(s):  
Injection Molding ◽  
Recovery Process ◽  
Recycling Rate ◽  
Injection Molding Process ◽  
Test Results ◽  
Molding Process ◽  
Plastic Recycling ◽  
Electrical Conductivities ◽  
Polymeric Solutions ◽  
Recycled Plastics

Plastic recycling is a recovery process of waste plastics to make new products into different forms. Plastics are usually sorted based on their resin identification codes before the recycling and melting processes. Although the recycling rate of plastics is significantly high, properties and economical value of the recycled plastics are fairly low, which in turn limits the use of recycled plastics in the market. In the present study, high density polyethylene (HDPE) in the form of pellets was dissolved in toluene, and then nanoscale graphene inclusions at different loadings (e.g., 0%, 0.25%, 0.5%, 1%, 2% and 4%) were added into the polymeric solutions. The remaining solvent was removed from the nanocomposite before the injection molding process. The injection molding process was conducted on the chopped recycled plastics associated with graphene loadings. The dielectric and electric properties of plastic nanocomposites were studied in detail. The test results showed that the dielectric properties were slightly improved by the addition of inclusions, which may be due to the non-polar nature of HDPE and/or residues in the recycled plastics. However, electrical conductivities of nanocomposites were significantly increased because of the improved electrical conduction, polarization and electron mobility at room temperature.

Injection molding of conductor paths: integration of functionality by the use of a metal/thermoplastic hybrid material

2011 ◽  
Vol 31 (6-7) ◽  
Author(s):  
Walter Michaeli ◽  
Christian Hopmann ◽  
Jan Fragner ◽  
Tobias Pfefferkorn
Keyword(s):  
Injection Molding ◽  
Hybrid Material ◽  
Maximum Flow ◽  
Heating System ◽  
Injection Molding Process ◽  
Inductive Heating ◽  
Molding Process ◽  
Thermoplastic Matrix ◽  
Flow Length ◽  
Electrical Conductivities

Abstract This article deals with the further processing of a compounded metal/thermoplastic hybrid material through injection molding. By synergistically combining two fillers, short copper fibers and a low melting alloy, in a thermoplastic matrix, it is possible to achieve extremely high electrical conductivities comparable to those of steel. At the same time, it is possible to manufacture complex parts directly using (multi-component) injection molding. The filling and solidification behavior of this highly filled material is significantly changed due to the amount of metal. The maximum flow lengths and the resulting electrical properties of the compound are investigated based on small conductor paths in 2C injection molding. Constant high mold temperatures significantly improve the maximum flow length of conductor paths without having any significant effects on electrical conductivity. With an additional dynamic mold tempering, using an external inductive heating system, the flow ability can be further improved within the injection molding process.

Injection Molding of Rubber: Structure, Processing and Properties

1978 ◽  
Vol 51 (1) ◽  
pp. 26-34 ◽  
Author(s):  
Boh C. Tsai
Keyword(s):  
Injection Molding ◽  
Recovery Process ◽  
Integral Approach ◽  
Design Parameters ◽  
Injection Molding Process ◽  
Anisotropic Behavior ◽  
Molding Process ◽  
Operating Variables ◽  
Molded Part ◽  
And Performance

Abstract The anisotropic behavior of an injection molded part from a disk mold is reported. It is concluded that orientation rather than state of cure is responsible for the anisotropic behavior. The slow strain recovery process of elongational deformation of the uncured rubber is the major factor in introducing orientation. This example is used to illustrate the viewpoint that the total injection molding process should be investigated from an integral approach which takes into account the interactions of parameters in various areas. Engineering concepts such as the unit operations approach have been gradually gaining acceptance in injection molding of rubber, and compound development continues to progress satisfactorily. However, the success of injection molding will largely depend on the skillful manipulation of material characteristics, design parameters, and operating variables under some unfavorable constraints to meet the cost and performance requirements.

scholarly journals The effect of virgin nylon addition into recycled nylon on the fatigue strength of thermoplastic nylon denture base

2020 ◽  
Vol 32 (1) ◽  
pp. 68
Author(s):  
Siti Wahyuni ◽  
Jeewena Ravichanthiran
Keyword(s):  
Fatigue Strength ◽  
Injection Molding ◽  
Mean Value ◽  
Laboratory Research ◽  
Injection Molding Process ◽  
Test Results ◽  
Molding Process ◽  
Denture Base ◽  
Experimental Laboratory ◽  
The Mean

Introduction: Thermoplastic nylon denture base is processed through injection molding process. This manipulation technique produces non-biodegradable nylon wastes which have to be recycled. Recycling of nylon wastes is feasible due to the linear molecular structure of thermoplastic nylon. This study aimed to know the effect of adding virgin nylon into recycled nylon on the fatigue strength of thermoplastic nylon denture base. Methods: This research was experimental laboratory research using 27 samples of thermoplastic nylon with three different groups (100% virgin nylon, 100% recycled nylon and combination of 60% of virgin nylon with 40% of recycled nylon) using injection molding technique. The test results were analyzed using one-way ANOVA test to know the differences in the mean value of the fatigue strength of each group and LSD test to know the effect of adding 60% of virgin nylon into 40% of recycled nylon. Resuts: Results showed significant results (p < 0,05), as well as LSD test that showed there is effect of adding 60% of virgin nylon into 40% of recycled nylon on the fatigue strength of thermoplastic nylon denture base. Conclusion: The combination of 60% of virgin nylon with 40% of recycled nylon showed higher fatigue strength than the recycled nylon.

Filling Behavior of Polymer Material into Sub-^|^mu;m Structure in Injection Molding Process

2013 ◽  
Vol 133 (4) ◽  
pp. 105-111
Author(s):  
Chisato Yoshimura ◽  
Hiroyuki Hosokawa ◽  
Koji Shimojima ◽  
Fumihiro Itoigawa
Keyword(s):  
Injection Molding ◽  
Polymer Material ◽  
Injection Molding Process ◽  
Molding Process

Pengembangan Mesin Pencacah Sampah/Limbah Plastik Dengan Sistem Crusher dan Silinder Pemotong Tipe Reel

2015 ◽  
Vol 10 (2) ◽  
pp. 66
Author(s):  
Junaidi - ◽  
Ichlas Nur ◽  
Nofriadi - ◽  
Rusmardi -
Keyword(s):  
Testing Machine ◽  
Engine Performance ◽  
Performance Testing ◽  
Injection Molding Process ◽  
Molding Process ◽  
Recycling Industry ◽  
Performance Improvements ◽  
Plastic Recycling ◽  
Technical Evaluation ◽  
Lower Frame

Waste plastic mounting, but can be recycled into other products in the form of granules before further processed into pellets and seed injection molding process produces products such as buckets, plates, bottles and other beverages. To be processed into the required form of granules of plastic thrasher. Though so small plastic recycling industry is still constrained in plastic enumeration process because the machine used was not optimal ability. The purpose of this research is the development of the system thrasher plastic crusher and cutter cylinder-type reel and technical evaluation. This study was conducted over two years, the first year the design and manufacture of machinery, the second year is a technical evaluation of the engine, engine performance improvements and economic analysis of granular plastic products.From the results obtained engine design capacity of the machine ± 350 kg / h, the engine size is 50 cm x 120 cm x 30 cm, power motor of 10 HP at 1450 RPM rotation with 3 phase. Some of the major components of the engine that is, counter crusher unit consists of two counter rotating cylinders opposite, counter shaft size Ø 4 cm x 58 cm, blade chopper Ø 17 cm x 2 cm with the number of teeth / blades 7 pieces and the number of blades along shaft 7 pieces, buses retaining Ø 10 cm x 2 cm. Counter-cylinder unit consists of a reel-type cutter counter shaft size Ø 4 cm x 90 cm, the middle shaft mounted cylinder with Ø 17 cm x 40 cm as the holder of the chopper blades. Chopper blade consists of 4 pieces with a size of 40 cm x 2 cm x 4 cm with ASSAB materials. Furthermore, as the blade retaining bedknife shear force of the blade chopper, upper frame, lower frame, strainer, funnel entry, exit funnel, and the drive unit consists of an electric motor, reducer, belts, pulleys and 2 pieces of gear transmission. The results of performance testing machine crusher round cylinder 75 RPM and 1450 RPM reel-type cutting machine capacity ± 300 kg / h on the filter hole Ø 1.5 cm, with a 80% grain uniformity.

scholarly journals Study on External Gas-Assisted Mold Temperature Control with the Assistance of a Flow Focusing Device in the Injection Molding Process

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 965 ◽  
Author(s):  
Nguyen Truong Giang ◽  
Pham Son Minh ◽  
Tran Anh Son ◽  
Tran Minh The Uyen ◽  
Thanh-Hai Nguyen ◽  
...  
Keyword(s):  
Injection Molding ◽  
Temperature Control ◽  
Mold Temperature ◽  
Injection Molding Process ◽  
Melt Flow ◽  
Flow Focusing ◽  
Molding Process ◽  
Heating Efficiency ◽  
Flow Length ◽  
Insert Plate

In the injection molding field, the flow of plastic material is one of the most important issues, especially regarding the ability of melted plastic to fill the thin walls of products. To improve the melt flow length, a high mold temperature was applied with pre-heating of the cavity surface. In this paper, we present our research on the injection molding process with pre-heating by external gas-assisted mold temperature control. After this, we observed an improvement in the melt flow length into thin-walled products due to the high mold temperature during the filling step. In addition, to develop the heating efficiency, a flow focusing device (FFD) was applied and verified. The simulations and experiments were carried out within an air temperature of 400 °C and heating time of 20 s to investigate a flow focusing device to assist with external gas-assisted mold temperature control (Ex-GMTC), with the application of various FFD types for the temperature distribution of the insert plate. The heating process was applied for a simple insert model with dimensions of 50 mm × 50 mm × 2 mm, in order to verify the influence of the FFD geometry on the heating result. After that, Ex-GMTC with the assistance of FFD was carried out for a mold-reading process, and the FFD influence was estimated by the mold heating result and the improvement of the melt flow length using acrylonitrile butadiene styrene (ABS). The results show that the air sprue gap (h) significantly affects the temperature of the insert and an air sprue gap of 3 mm gives the best heating rate, with the highest temperature being 321.2 °C. Likewise, the actual results show that the height of the flow focusing device (V) also influences the temperature of the insert plate and that a 5 mm high FFD gives the best results with a maximum temperature of 332.3 °C. Moreover, the heating efficiency when using FFD is always higher than without FFD. After examining the effect of FFD, its application was considered, in order to improve the melt flow length in injection molding, which increased from 38.6 to 170 mm, while the balance of the melt filling was also clearly improved.

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