Abstract
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.
Highlights
The main focus of the research was the influence of selective induction heating of certain mold areas on the shear rate of the melt
The hinges results comes of the simulation studyshear of selective induction heatingfilling of theof flexible hinge between from different rates that occur during the cavities region are shown in
A significant improvement in hinge strength was obtained by increasing the mold The results from the open/close test were stored in *. xlsx spreadsheet and temperature as a result of the induction heating method
Summary
Increasing demand for high-volume production of low-cost, high-quality products has resulted in increased development of technologies for manufacturing plastic products [1–3]. Studies confirm the improvement of the strength properties of products in which the production process uses methods to increase the mold temperature during injection [25–27] Application of technologies such as steam heating or cartridge heating can cause a significant extension of the cooling phase. One of the technologies that make this possible is heating the forming surfaces with an assisting gas [30–32] This has resulted in improved product surface quality and better filling of the mold cavity, defects such as layers of frozen plastic have been eliminated. The main focus of the research was the influence of selective induction heating of certain mold areas on the shear rate of the melt This has a direct effect on the strength properties of the manufactured product. The verification was carried out the design and building of the proprietary of the test stand measuring the number of cycles of opening and closing moldings equipped with a flexible hinge
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