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Internal Induction Heating for Local Heating in Injection Molding.

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Title: Internal Induction Heating for Local Heating in Injection Molding.
Authors: Do, Thanh Trung1 (AUTHOR), Thuan, Huynh Duc2,3,4 (AUTHOR) hdthuansdh241@hcmut.edu.vn, Uyen, Tran Minh The1,3 (AUTHOR), Hon, Nguyen Thanh1,4 (AUTHOR), Minh, Pham Son1 (AUTHOR), Anh Son, Tran2,3 (AUTHOR)
Source: Polymers (20734360). Nov2025, Vol. 17 Issue 21, p2906. 34p.
Subjects: Induction heating, Injection molding, Energy consumption, Viscosity, Eddy currents (Electric), Temperature control, Polypropylene
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. Mold-filling experiments demonstrated that In-IH significantly improved the flowability of PP: at 180 °C, the 0.4 mm specimen achieved a flow length of 85.33 mm, compared with 43.66 mm for the 0.2 mm specimen. At 250–300 °C, all samples approached full filling (~100 mm). The simulation and experimental results agreed, with a maximum deviation of 10%, confirming that In-IH provides rapid, energy-efficient, and precise temperature control, thus enhancing melt flow and product quality for thin-walled PP components. [ABSTRACT FROM AUTHOR]
Copyright of Polymers (20734360) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Internal Induction Heating for Local Heating in Injection Molding.
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  Data: <searchLink fieldCode="AR" term="%22Do%2C+Thanh+Trung%22">Do, Thanh Trung</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Thuan%2C+Huynh+Duc%22">Thuan, Huynh Duc</searchLink><relatesTo>2,3,4</relatesTo> (AUTHOR)<i> hdthuansdh241@hcmut.edu.vn</i><br /><searchLink fieldCode="AR" term="%22Uyen%2C+Tran+Minh+The%22">Uyen, Tran Minh The</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Hon%2C+Nguyen+Thanh%22">Hon, Nguyen Thanh</searchLink><relatesTo>1,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Minh%2C+Pham+Son%22">Minh, Pham Son</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Anh+Son%2C+Tran%22">Anh Son, Tran</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Polymers+%2820734360%29%22">Polymers (20734360)</searchLink>. Nov2025, Vol. 17 Issue 21, p2906. 34p.
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  Data: <searchLink fieldCode="DE" term="%22Induction+heating%22">Induction heating</searchLink><br /><searchLink fieldCode="DE" term="%22Injection+molding%22">Injection molding</searchLink><br /><searchLink fieldCode="DE" term="%22Energy+consumption%22">Energy consumption</searchLink><br /><searchLink fieldCode="DE" term="%22Viscosity%22">Viscosity</searchLink><br /><searchLink fieldCode="DE" term="%22Eddy+currents+%28Electric%29%22">Eddy currents (Electric)</searchLink><br /><searchLink fieldCode="DE" term="%22Temperature+control%22">Temperature control</searchLink><br /><searchLink fieldCode="DE" term="%22Polypropylene%22">Polypropylene</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: 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. Mold-filling experiments demonstrated that In-IH significantly improved the flowability of PP: at 180 °C, the 0.4 mm specimen achieved a flow length of 85.33 mm, compared with 43.66 mm for the 0.2 mm specimen. At 250–300 °C, all samples approached full filling (~100 mm). The simulation and experimental results agreed, with a maximum deviation of 10%, confirming that In-IH provides rapid, energy-efficient, and precise temperature control, thus enhancing melt flow and product quality for thin-walled PP components. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Polymers (20734360) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.3390/polym17212906
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 34
        StartPage: 2906
    Subjects:
      – SubjectFull: Induction heating
        Type: general
      – SubjectFull: Injection molding
        Type: general
      – SubjectFull: Energy consumption
        Type: general
      – SubjectFull: Viscosity
        Type: general
      – SubjectFull: Eddy currents (Electric)
        Type: general
      – SubjectFull: Temperature control
        Type: general
      – SubjectFull: Polypropylene
        Type: general
    Titles:
      – TitleFull: Internal Induction Heating for Local Heating in Injection Molding.
        Type: main
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            NameFull: Do, Thanh Trung
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            NameFull: Thuan, Huynh Duc
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            NameFull: Uyen, Tran Minh The
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            NameFull: Hon, Nguyen Thanh
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            NameFull: Minh, Pham Son
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            – D: 01
              M: 11
              Text: Nov2025
              Type: published
              Y: 2025
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              Value: 17
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