2026-09-20T07:58:59Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/938522026-06-06T01:04:03Zcom_1721.1_7582com_1721.1_7581col_1721.1_131023
David E. Hardt.
Svenson, Ernest Knute
Massachusetts Institute of Technology. Department of Mechanical Engineering.
Massachusetts Institute of Technology. Department of Mechanical Engineering
2015-02-05T18:29:33Z
2015-02-05T18:29:33Z
2014
2014
http://hdl.handle.net/1721.1/93852
900983755
Thesis: M. Eng. in Manufacturing, Massachusetts Institute of Technology, Department of Mechanical Engineering, 2014.
Cataloged from PDF version of thesis.
Includes bibliographical references (page 74).
This thesis documents the process and challenges of adding a new calender machine to AvCarb Material Solutions' pyrolytic graphite production plant. Before the machine could be used for mass production, several experiments needed to be conducted to better understand the capabilities of the machine. A process control procedure was designed to set up the machine to produce parts within specification. By using a one-factor-at-a-time approach, the process capability (Cpk) ofthe calender machine can be significantly improved. Additionally, the calender machine was used to investigate the significance of common defects on the uncalendered material. Experiments show that spots that are 3 millimeters or less, scratches, and certain ripples do not cause a destructive effect on the calendered sheet; therefore, sheets with these defects can be safely passed through the quality inspection stage. Foreign object debris causes bubbles, which are destructive effects, to appear on the calendered sheet; therefore, sheets with foreign object debris should not pass inspection. However, if the foreign object debris is physically removed from the sheet before calendering, the resulting sheet will not have any destructive defects. Thus, by not rejecting uncalendered sheets with certain defects, AvCarb can improve its process yield. Additionally, a thermal conductivity test apparatus was designed and used to determine that the calendered heat spreader is 70% more thermally conductive than its uncalendered counterpart.
by Ernest Knute Svenson.
M.Eng. in Manufacturing
74 pages
eng
Massachusetts Institute of Technology
M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.
http://dspace.mit.edu/handle/1721.1/7582
Mechanical Engineering.
The addition of a calender machine to a pyrolytic graphite sheet production plant
Thesis
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<Abstract>This thesis documents the process and challenges of adding a new calender machine to AvCarb Material Solutions' pyrolytic graphite production plant. Before the machine could be used for mass production, several experiments needed to be conducted to better understand the capabilities of the machine. A process control procedure was designed to set up the machine to produce parts within specification. By using a one-factor-at-a-time approach, the process capability (Cpk) ofthe calender machine can be significantly improved. Additionally, the calender machine was used to investigate the significance of common defects on the uncalendered material. Experiments show that spots that are 3 millimeters or less, scratches, and certain ripples do not cause a destructive effect on the calendered sheet; therefore, sheets with these defects can be safely passed through the quality inspection stage. Foreign object debris causes bubbles, which are destructive effects, to appear on the calendered sheet; therefore, sheets with foreign object debris should not pass inspection. However, if the foreign object debris is physically removed from the sheet before calendering, the resulting sheet will not have any destructive defects. Thus, by not rejecting uncalendered sheets with certain defects, AvCarb can improve its process yield. Additionally, a thermal conductivity test apparatus was designed and used to determine that the calendered heat spreader is 70% more thermally conductive than its uncalendered counterpart.</Abstract>
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