Application of Selective Induction Heating for Improvement of Mechanical Properties of Elastic Hinges

Muszyński, Paweł; Poszwa, Przemysław; Gessner, Andrzej; Mrozek, Krzysztof

doi:10.3390/ma14102543

Cited by 5 publications

(9 citation statements)

References 40 publications

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“…This is confirmed by the results of the research in which the influence of increasing the mold temperature was studied. It was possible to obtain better strength properties [ 36 , 37 , 38 ], an example of this is the increase in strength of flexible hinges [ 39 ]. As well as aesthetic properties of the products [ 29 , 40 , 41 ].…”

Section: Discussionmentioning

confidence: 99%

Design and Simulation Study of the Induction Heated Injection Mold with Sliders

et al. 2021

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In order to increase the quality of the products manufactured by injection molding, RTC technology can be used to achieve higher mold temperatures. As a result, the path of the injected melt can be extended, allowing the production of parts with more complex shapes and greater length. Induction heating allows heating only selected forming surfaces of the mold which increases the speed and efficiency of the process. This paper presents the concept of a detachable inductor integrated with sliders to enable the application of this technology in an injection mold with sliders, along with the theoretical model used to perform the tests. First, the effect of the magnetic concentrator shape on the process was analyzed. This was followed by a simulation study of the influence of process parameters: heating time, frequency, and electric current. An extensive analysis of the test results of the temperature distribution on the insert allowed for the selection of parameter sets that would enable obtaining the desired surface temperature without a major increase in process time. The results of simulation studies confirm the possible applications and present the range of parameters for obtaining the optimal process.

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Section: Discussionmentioning

confidence: 99%

Design and Simulation Study of the Induction Heated Injection Mold with Sliders

et al. 2021

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“…Figure 1 b also shows the position of the insert and the induction coil during the heating period. In other studies [ 11 , 35 ], the gap between the induction coil and the heating surface was found to be an important parameter affecting the heating speed and the temperature distribution of the heating surface. However, in other research, the induction coil heats the cavity surface directly when the two half mold plates are open, so the space in which the coil can move, and the heat is limited.…”

Section: Simulation and Experimental Methodsmentioning

confidence: 96%

“…In the field of mold temperature control, one of the advantages of induction heating is the ability to predict the heating result [ 11 , 34 , 35 ]. However, the heating position in this research is different from that of the traditional induction heating; therefore, the heating process was achieved using the meshing model as in Figure 5 a and Table 1 .…”

Section: Simulation and Experimental Methodsmentioning

confidence: 99%

“…However, to increase the melt flow length by this method, a higher material cost is incurred; on the other hand, in some cases, the molding material is fitted by the customer. In order to reduce the frozen layer, the use of a high mold temperature has yielded good results in reducing the filling pressure and clearly improving the melt flow length [ 11 , 12 , 13 ]. According to research on mold temperature control [ 14 , 15 , 16 , 17 , 18 ], this is a crucial aspect of plastic manufacturing in the field of injection molding.…”

Section: Introductionmentioning

confidence: 99%

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Improving the Melt Flow Length of Acrylonitrile Butadiene Styrene in Thin-Wall Injection Molding by External Induction Heating with the Assistance of a Rotation Device

Minh

2021

Polymers

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In injection molding, the temperature control of the dynamic mold is an excellent method for improving the melt flow length, especially of thin-wall products. In this study, the heating efficiency of a novel heating strategy based on induction heating was estimated. With the use of this heating strategy, a molding cycle time similar to the traditional injection molding process could be maintained. In addition, this strategy makes it easier to carry out the heating step due to the separation of the heating position and the mold structure as well as allowing the ease of magnetic control. The results show that, with an initial mold temperature of 30 °C and a gap (G) between the heating surface and the inductor coil of 5 mm, the magnetic heating process can heat the plate to 290 °C within 5 s. However, with a gap of 15 mm, it took up to 8 s to reach 270 °C. According to the measurement results, when the mold heating time during the molding process increased from 0 to 5 s, the flow length increased significantly from 71.5 to 168.1 mm, and the filling percentage of the thin-wall product also increased from 10.2% to 100%. In general, the application of external induction heating (Ex-IH) during the molding cycle resulted in improved melt flow length with minimal increase in the total cycle time, which remained similar to that of the traditional case.

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“…The authors undertook to analyze these phenomena by performing experimental and simulation studies. The first part of the research results was described in study [42]. Strength tests of the samples made by two methods were performed.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Strength of Plastic Parts Improved with Selective Induction Heating

et al. 2021

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The use of selective induction heating of molding surfaces allows for better filling of molding cavities and has a positive effect on the properties of molded products. This is particularly important in the production of parts that include flexible hinges, which are thin plastic layers connecting two or more parts of the product. By using hinges, it is possible to expand the use of injection molding products and their capabilities. They are widely used in the production of parts for the electrical engineering industry and for packaging Fast Moving Consumer Goods (FMCG). The use of hinges also entails specific reductions in wall thickness. Increases in the shear rate can be expected, which can lead to the degradation of polymers and deterioration of mechanical properties of materials. This paper investigates injection molded flexible hinge parts manufactured with selective induction heating to improve their properties. To verify the efficiency of reduction of material degradation due to high shear rates, open/close tests of elastic hinges were performed. The linear relation between the number of cycles the hinges can withstand, mold temperature and injection time was identified, where mold temperature was the more significant factor.

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Application of Selective Induction Heating for Improvement of Mechanical Properties of Elastic Hinges

Cited by 5 publications

References 40 publications

Design and Simulation Study of the Induction Heated Injection Mold with Sliders

Design and Simulation Study of the Induction Heated Injection Mold with Sliders

Improving the Melt Flow Length of Acrylonitrile Butadiene Styrene in Thin-Wall Injection Molding by External Induction Heating with the Assistance of a Rotation Device

Investigation of the Strength of Plastic Parts Improved with Selective Induction Heating

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