Internal Induction Heating for Local Heating in Injection Molding
Thanh Trung Do, Huynh Duc Thuan, Tran Minh The Uyen, Nguyen Thanh Hon, Pham Son Minh, Tran Anh Son
TL;DR
This paper introduces a new internal induction heating method for injection molding that improves temperature control and product quality in thin-walled polypropylene parts.
Contribution
The novel In-IH system enables rapid, localized heating by integrating the insert into the induction circuit, enhancing efficiency and flowability.
Findings
Thinner inserts achieved higher surface temperatures, with a 0.5 mm insert reaching ~550 °C.
Narrower inserts concentrated heat better, while wider ones improved temperature uniformity.
In-IH significantly improved PP flowability, with 85.33 mm flow length at 180 °C for a 0.4 mm specimen.
Abstract
This study introduces Internal Induction Heating (In-IH) as an efficient method for local mold temperature control in thin-walled polypropylene (PP) injection molding. Unlike conventional systems that are slow and energy-intensive, the insert is integrated directly into the induction circuit in the In-IH system, generating eddy currents for rapid and localized heating. Numerical and experimental analyses were performed to examine the effects of insert geometry and heating parameters; it was found that thinner inserts achieved higher surface temperatures—the 0.5 mm insert reached ~550 °C, while the 2.0 mm insert reached only ~80 °C—confirming an inverse relationship between thickness and temperature. Narrower inserts (25 mm) concentrated heat more effectively, whereas wider ones yielded better temperature uniformity. The cooling conditions strongly affected the temperature gradients.…
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Taxonomy
TopicsInjection Molding Process and Properties · Polymer Foaming and Composites · Epoxy Resin Curing Processes