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IJAT Vol.11 No.1 pp. 90-96
doi: 10.20965/ijat.2017.p0090
(2017)

Paper:

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Investigation of Flash Generation Process for Engineering Plastic by Flash Generation-Evaluating Mold

Yasuhiko Murata†, Tomoki Inoue, and Tomonari Fujibayashi

Nippon Institute of Technology
4-1 Gakuendai, Miyashiro-machi, Minamisaitama-gun, Saitama 345-8501, Japan

†Corresponding author

Received:
May 12, 2016
Accepted:
September 15, 2016
Published:
January 5, 2017
Creative Commons License
Keywords:
injection molding, flash, flash generation-evaluating mold, engineering plastic
Abstract
Flash is an appearance defect that arises in injection molding. In this paper, a flash generation-evaluating mold developed by the authors was improved to evaluate the ease of occurrence of flashes in resins, such as engineering plastic, molded at high mold temperatures and melt pressures in the cavity. Using the improved mold, we evaluated the occurrence conditions of secondary flash in polyoxymethylene (POM), polyamide PA6 (nylon-6), and polycarbonate (PC). The secondary flash occurred most easily for PA6, second most easily for POM, and least easily for PC. A correlation between the ease of occurrence of secondary flash and the crystallization of the resin was also clarified.
Cite this article as:
Y. Murata, T. Inoue, and T. Fujibayashi, “Investigation of Flash Generation Process for Engineering Plastic by Flash Generation-Evaluating Mold,” Int. J. Automation Technol., Vol.11 No.1, pp. 90-96, 2017.
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References
  1. [1] The Japan Society for Technology of Plasticity, “Flow Simulation – Plastics Molding,” Corona Publishing Co. Ltd., p. 132, 2004.
  2. [2] N. Koga, Y. Murata et.al., “Fundamentals in Production Processing,” Corona Publishing Co. Ltd., p. 125, 2009.
  3. [3] H. Yokoi and H. Yokomizo, “Experimental Analysis of Flash Generation Process by Using Integrated Thermocouple Sensor (Part I),” The Japan Society of Polymer Processing 1997, Technical papers, pp. 54-55, 1997.
  4. [4] H. Yokomizo and H. Yokoi, “Experimental Analysis of Flash Generation Process by Using Integrated Thermocouple Sensor (Part II),” The Japan Society of Polymer Processing 1997 Symposia Papers, pp. 267-268, 1997.
  5. [5] H. Higuchi and H. Goto,“New Method for Analyzing Flash Property of PPS/GF Composite,” The Japan Society of Polymer Processing 2001 Symposia Papers, pp. 57-58, 2001.
  6. [6] Y. Shimizu, H. Koresawa, H. Narahara, and H. Suzuki, “Consideration for Evaluation Index of Flash Occurring at the Edge of Parting Line on Injection Molding,” 2007 Annual Meeting (Spring) of the Japan Society for Precision Engineering, pp. 653-654, 2007.
  7. [7] M. Niikawa, H. Shibata, H. Yamagata, and T. Fujikawa, “Estimation of Gap Between Parting Line by Mold Deflection Simulation,” 2014 Annual Meeting (Autumn) of the Japan Society for Precision Engineering, pp. 721-722, 2014.
  8. [8] H. Koresawa, H. Suzuki, T. Takenaka, and S. Kinjo, “Structural Stiffness of Injection Mold and Molding Defect (Discussion on Reducing Molding Flash by Improving Structure of Injection Mold),” Trans. of the Japan Society of Mechanical Engineers, Series C, Vol.63, No.610, pp. 324-330, 1997.
  9. [9] M. Niikawa, H. Yamagata, K. Takada, S. Tanikawa, and M. Yamaguchi, “Examination of Casting Flash Restraint by Mold Temperature Control of Die-Casting of Aluminum Alloy,” 2015 Annual Meeting (Autumn) of the Japan Society for Precision Engineering, pp. 371-372, 2015.
  10. [10] Y. Murata, H. Hashimoto, Y. Hara, T. Shimizu, R. Shibasaki, K. Nitta, and K. Kikumori, “Experimental Analysis on Relationship between Flash Generation and Mold Deformation in Injection Mold (Part I) – Application of Strain Sensor to Mold Deformation Measurement,” J. of the Japan Society of Polymer Processing, Seikei-Kakou, Vol.25, No.5, pp. 234-240, 2013.
  11. [11] Y. Murata, T. Hishida, T. Komatsu, K. Nitta, K. Saitoh, and K. Kikumori, “Experimental Analysis on Relationship between Flash Generation and Mold Deformation in Injection Mold (Part II) – Influence of Molding Conditions,” J. of the Japan Society of Polymer Processing, Seikei-Kakou, Vol.25, No.6, pp. 283-289, 2013.
  12. [12] Y. Murata, T. Hishida, H. Tokoro, and K. Yoshida, “Development of Flash Generation Measurement Mold,” J. of the Japan Society of Polymer Processing, Seikei-Kakou, Vol.26, No.6, pp. 270-275, 2014.

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