Thomas, C.
and Bur, A.
(1999),
In-Situ Monitoring of Product Shrinkage During Injection Molding Using an Optical Sensor, Proceedings of the Society of Plastics Engineers Annual Technical Meeting, New York, NY, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=851440
(Accessed September 11, 2024)
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In-Situ Monitoring of Product Shrinkage During Injection Molding Using an Optical Sensor
Published
Author(s)
C L. Thomas,
Abstract
We have used an optical fiber sensor for in-situ monitoring of product shrinkage during injection molding. The sensor, consisting of a bundle of optical fibers with a sapphire window at its end, is positioned in the ejector pin channel of the mold so that the sapphire window sits flush with the inside cavity wall. When the molded product shrinks, it separates from the wall and sapphire window, and establishes the geometry of a Fabry-Perot interferometer. During the molding of polystyrene, polypropylene and polyethylene, we observed optical interference fringes, and by counting fringes, a measurement of shrinkage was made.Proceedings Title
Proceedings of the Society of Plastics Engineers Annual Technical Meeting
Volume
86
Conference Dates
May 1, 1999
Conference Location
New York, NY
Conference Title
Society of Plastics Engineers. Technical Meeting
Pub Type
Conferences
Download Paper
Keywords
injection molding, interferometer, optical fiber sensor, polyethylene, polypropylene, polystyrene, process monitoring, shrinkage
Citation
Issues
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Created December 31, 1998, Updated October 12, 2021