Numerical study on the influence of Rapid Temperature Cycling (RTC) on polymer flow at maximum injection pressure

Mrozek, Krzysztof; Poszwa, Przemysław; Muszyński, Paweł

doi:10.1080/10407782.2020.1724007

Cited by 5 publications

(4 citation statements)

References 39 publications

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“…The increase in the surface temperature above the transition temperature of polymer melt allows the manufacturing of long thin-walled parts. For this purpose, the Rapid Temperature Cycling (RTC) technology was developed, where the surface of the mold is periodically heated [ 12 , 13 ]. Higher surface temperature can significantly increase the time of part cooling, especially when technologies such as steam heating or cartridge heating are used.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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Injection molding is a polymer processing technology used for manufacturing parts with elastic hinges. Elastic hinges are widely used in FMCG (Fast Moving Consumer Goods) packaging (e.g., bottle closures of shampoos, sauces) and in the electrical engineering industry. Elastic hinge is a thin film that connect two regions of the injection molded part, where significant shear rates are present, which can lead to the degradation of polymers and the decrease in mechanical properties. Selective induction heating is the method that improves the flow of the polymer melt through thin regions by the local increase in mold temperature. In this study, selective induction heating was used to improve mechanical properties of elastic hinges by the reduction of material degradation due to high shear rates. To verify the change of shear rates, selective induction heating simulation and injection molding simulations were performed. The linear relation between mold temperature and maximum shear rate in the cross-section was identified and the mechanical tests showed significant differences in hinge stiffness, tensile strength and elongation at break.

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Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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“…This has led to the development of Rapid Temperature Cycling (RTC) technology. Its main principle is the cyclic change of the mold temperature during the production process [11,19]. Initially, the mold is heated in order to increase its temperature during the injection of plastic.…”

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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“…Rapid Temperature Cycling (RTC) technology can be used to solve these problems. The process involves cyclic heating of the surface of the molding insert to a temperature close to that of the flowing material during injection molding [ 9 , 13 ]. After the cavity is filled, the cooling phase follows.…”

Section: Introductionmentioning

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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Numerical study on the influence of Rapid Temperature Cycling (RTC) on polymer flow at maximum injection pressure

Cited by 5 publications

References 39 publications

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

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

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

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

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