| 摘要 |
Disclosed herein is a process for heat treating a foamed copolyester thermoplastic sheet structure in order to achieve a sheet structure having a compression set resistance (as determined according to ISO 1856, 22 hours, 70° C., 30% compression) of less than 11%. Heat treating involves annealing followed by at least two cycles of pre-compression at approximately the annealing temperature.
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