Direct flow visualization of hesitation during injection molding of thermoplastic polymers

Francesco Regi*, Guido Tosello

*Corresponding author for this work

Research output: Contribution to journalConference articleResearchpeer-review

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Abstract

A special mold provided with a glass window has been used in order to directly evaluate the flow progression during the filling phase of the injection molding process. The flow of the polymer was recorded at 500 frames per second using a high-speed camera. Two unfilled thermoplastic polymers, acrylonitrile butadiene styrene (ABS) and polypropylene (PP), were used to fill a 50 mm x 18 mm staircase geometry cavity, which was specifically designed to evaluate the hesitation effects. Complete and incomplete (short shot) filling of the cavity were performed with two different velocities and with two dimensionally different but geometrically identical cavities. Two different methods for the reproduction of the short shots were used. In the first, the maximum applied pressure was limited and progressively raised (MP Method), in the second the desired positions were obtained with a consecutive increase of the stroke length (standard SS method). The analysis of the video recordings highlighted that flow progression and hesitation were mainly influenced not only by the geometry, but also by the velocity and the material.
Original languageEnglish
Article number030001
JournalAIP Conference Proceedings
Volume2139
Issue number1
Number of pages5
ISSN0094-243X
DOIs
Publication statusPublished - 2019

Keywords

  • Glass Mold
  • High Speed Camera
  • Injection Molding
  • Afterflow
  • Hesitation
  • Thermoplastic

Cite this

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title = "Direct flow visualization of hesitation during injection molding of thermoplastic polymers",
abstract = "A special mold provided with a glass window has been used in order to directly evaluate the flow progression during the filling phase of the injection molding process. The flow of the polymer was recorded at 500 frames per second using a high-speed camera. Two unfilled thermoplastic polymers, acrylonitrile butadiene styrene (ABS) and polypropylene (PP), were used to fill a 50 mm x 18 mm staircase geometry cavity, which was specifically designed to evaluate the hesitation effects. Complete and incomplete (short shot) filling of the cavity were performed with two different velocities and with two dimensionally different but geometrically identical cavities. Two different methods for the reproduction of the short shots were used. In the first, the maximum applied pressure was limited and progressively raised (MP Method), in the second the desired positions were obtained with a consecutive increase of the stroke length (standard SS method). The analysis of the video recordings highlighted that flow progression and hesitation were mainly influenced not only by the geometry, but also by the velocity and the material.",
keywords = "Glass Mold, High Speed Camera, Injection Molding, Afterflow, Hesitation, Thermoplastic",
author = "Francesco Regi and Guido Tosello",
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language = "English",
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journal = "A I P Conference Proceedings Series",
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publisher = "American Institute of Physics",
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Direct flow visualization of hesitation during injection molding of thermoplastic polymers. / Regi, Francesco; Tosello, Guido.

In: AIP Conference Proceedings, Vol. 2139, No. 1, 030001, 2019.

Research output: Contribution to journalConference articleResearchpeer-review

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AU - Regi, Francesco

AU - Tosello, Guido

PY - 2019

Y1 - 2019

N2 - A special mold provided with a glass window has been used in order to directly evaluate the flow progression during the filling phase of the injection molding process. The flow of the polymer was recorded at 500 frames per second using a high-speed camera. Two unfilled thermoplastic polymers, acrylonitrile butadiene styrene (ABS) and polypropylene (PP), were used to fill a 50 mm x 18 mm staircase geometry cavity, which was specifically designed to evaluate the hesitation effects. Complete and incomplete (short shot) filling of the cavity were performed with two different velocities and with two dimensionally different but geometrically identical cavities. Two different methods for the reproduction of the short shots were used. In the first, the maximum applied pressure was limited and progressively raised (MP Method), in the second the desired positions were obtained with a consecutive increase of the stroke length (standard SS method). The analysis of the video recordings highlighted that flow progression and hesitation were mainly influenced not only by the geometry, but also by the velocity and the material.

AB - A special mold provided with a glass window has been used in order to directly evaluate the flow progression during the filling phase of the injection molding process. The flow of the polymer was recorded at 500 frames per second using a high-speed camera. Two unfilled thermoplastic polymers, acrylonitrile butadiene styrene (ABS) and polypropylene (PP), were used to fill a 50 mm x 18 mm staircase geometry cavity, which was specifically designed to evaluate the hesitation effects. Complete and incomplete (short shot) filling of the cavity were performed with two different velocities and with two dimensionally different but geometrically identical cavities. Two different methods for the reproduction of the short shots were used. In the first, the maximum applied pressure was limited and progressively raised (MP Method), in the second the desired positions were obtained with a consecutive increase of the stroke length (standard SS method). The analysis of the video recordings highlighted that flow progression and hesitation were mainly influenced not only by the geometry, but also by the velocity and the material.

KW - Glass Mold

KW - High Speed Camera

KW - Injection Molding

KW - Afterflow

KW - Hesitation

KW - Thermoplastic

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