Numerical study on the influence of RHCM on the basic parameters of filling the cavity

Poszwa, Przemysław; Muszyński, Paweł; Mrozek, Krzysztof

doi:10.1016/j.cirpj.2020.04.007

Cited by 7 publications

(7 citation statements)

References 21 publications

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“…A diagram of the developed concept of opening and closing the molded part is shown in Figure 6. The molded part ( 4) is placed in the cavity (8) and secured with the clamp (7). Sensors (3) confirm the presence of the movable half of the molded part after each closing cycle.…”

Section: Mechanical Testsmentioning

confidence: 99%

“…5). The tested molding ( 7) is being cu placed in the module retaining seat and secured with a clamp (8). The pneumatic cylind (11) moves the carriage with a cam (9) along the guide (12), which cyclically opens an closes the molding.…”

Section: Mechanical Testsmentioning

confidence: 99%

“…This is due to the reduced amount of material required and reduced cycle time through faster cooling after injection molding. In thin wall injection molding, there is the problem of incomplete filling of the cavity [8]. This is due to the progressive cooling of the melt while filling the mold cavity.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Mechanical Testsmentioning

confidence: 99%

Section: Mechanical Testsmentioning

confidence: 99%

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

et al. 2021

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“…Reduced wall thickness results in increased injection pressure, due to the reduction in the cross-section of the mold’s cavity of the flow path of the plastic [ 10 ]. A thin layer of polymer melt cools down rapidly, which increases the resistance of the flow and results in the freezing of the material before the complete filling of the cavity [ 11 ]. The increase in the surface temperature above the transition temperature of polymer melt allows the manufacturing of long thin-walled parts.…”

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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“…The increase of the surface temperature above the transition temperature of the polymer melt allows the manufacturing of long thin-walled parts. For this purpose, Rapid Temperature Cycling (RTC) technology was developed, where the surface of the mold is periodically heated [ 8 , 9 , 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Application of Magnetic Concentrator for Improvement in Rapid Temperature Cycling Technology

2020

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The main method to improve the filling of the cavity by the polymer melt is to increase the mold temperature. Rapid temperature cycling (RTC) technologies have been used around the world for several years, improving the quality of injection molded parts with a slight extension of production time. The present work focuses on the application of induction heating technology in the injection molding process since it is the most effective and most intensively developing method of heating in modern RTC technologies. In this research, the application of the induction heating process for selected surfaces was investigated with particular emphasis on the dynamics of the process. The numerical simulations were used to study the influence of the number of coils, the distance between coils and cavity surface and the mold material was examined with and without the presence of a magnetic concentrator. According to the obtained results, several crucial conclusions were made: the efficiency of heating is directly correlated with the distance between the inductor and the mold surface, the presence of magnetic flux concentrator significantly improves the homogeneity of temperature distribution and heating efficiency, application of aluminum mold lowers the obtained surface temperature.

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Numerical study on the influence of RHCM on the basic parameters of filling the cavity

Cited by 7 publications

References 21 publications

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

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

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

Application of Magnetic Concentrator for Improvement in Rapid Temperature Cycling Technology

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