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Vol. 34, No. 8(3), S&M3042

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Vol. 32, No. 8(2), S&M2292

Print: ISSN 0914-4935
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Sensors and Materials
is an international peer-reviewed open access journal to provide a forum for researchers working in multidisciplinary fields of sensing technology.
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Sensors and Materials, Volume 31, Number 10(2) (2019)
Copyright(C) MYU K.K.
pp. 3099-3110
S&M1996 Research Paper of Special Issue
https://doi.org/10.18494/SAM.2019.2357
Published: October 25, 2019

Development of Mold for Demolding Resistance Measurement in Polymer Injection Molding [PDF]

Yasuhiko Murata, Takahiro Nakanishi, Naoki Hirai, Fumiya Kawanishi, and Hidehiko Ibuki

(Received March 4, 201; Accepted May 7, 2019)

Keywords: polymer lens, injection molding, demolding resistance, quartz force sensor

In the injection molding of polymer lenses, the demolding resistance may cause problems, such as deformation, cracks, and scratches, in these products. To examine the method of decreasing the demolding resistance of polymer lenses, a method of precisely measuring the demolding resistance should be established. In this study, we designed and fabricated a mold equipped with high-sensitivity quartz force sensors for demolding resistance measurement that is customized for the injection molding of polymer lenses. In addition, we evaluated the performance of the mold. Using this mold, we measured the demolding resistance of fluorine-based polyester lenses. As a result, it was clarified that (1) the preload applied to the quartz force sensors before the start of mold closing has a significant effect on the generation of demolding resistance, (2) the draft angle of a cavity wall has an effect on the demolding resistance, and (3) the maximum demolding resistance increases with increasing holding pressure, injection rate, heating cylinder temperature, and mold temperature.

Corresponding author: Yasuhiko Murata


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This work is licensed under a Creative Commons Attribution 4.0 International License.

Cite this article
Yasuhiko Murata, Takahiro Nakanishi, Naoki Hirai, Fumiya Kawanishi, and Hidehiko Ibuki, Development of Mold for Demolding Resistance Measurement in Polymer Injection Molding, Sens. Mater., Vol. 31, No. 10, 2019, p. 3099-3110.



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